JPH1159257A - Cargo handling vehicle having removable container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten a shock applied to a truck or a container during cargo handling work as much as possible by detecting the position immediately before a container is unloaded on the ground by the backward turning of a lift arm by a sensor, and switching the operation of a driving means to the slow movement according to the detection signal. SOLUTION: When a hook cylinder 8 is expanded to turn a hook arm 5 backward, a third sensor detects an arm 5, and the turning of the hook arm 5 is stopped. A lift cylinder 7 starts expansion to turn a lift arm 4 backward. A container CL connected to the lift arm 4 is moved backward and simultaneously tilted backward. By backward turning and connection of the lift arm 4, immediately before the rear end of the container CL is grounded, the lift arm 4 detects a first sensor. According to the detection signal of the sensor, a third selector valve is switched to a neutral position, and pressure oil is supplied through a second selector valve to the lift cylinder 7 to diffuse the backward turning of the lift arm 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable container capable of loading and unloading a container mounted on an undercarriage between the undercarriage and the ground and dumping the undercarriage on the undercarriage. The present invention relates to a cargo handling vehicle provided with:

[0002]

2. Description of the Related Art Conventionally, a container is mounted on a chassis of a cargo handling vehicle via a lift arm and a dump arm, and the container is unloaded between the chassis and the ground by rotating the lift arm back and forth. A cargo handling vehicle having a detachable container in which the container is dumped by integrally tilting the lift arm and the dump arm is known (for example, see Japanese Utility Model Registration No. 2525461 and Japanese Patent Application Laid-Open No. 48-64617).

[0003]

However, in such a cargo-handling vehicle, the container mounted thereon is relatively large and heavy, so that when the container is dropped from the chassis to the ground, the container is not grounded. When a container is loaded on a chassis or when a dumped container is placed on the chassis, impacts are applied to the container, the chassis, and the like, which causes noise and deforms the container and the chassis. .

In order to solve such a problem, the operating speed of the lift arm or the dump arm may be reduced. However, this causes another problem that the speed of the cargo handling operation is impaired.

The present invention has been made in view of the above circumstances, and it is possible to reduce the impact on a chassis or a container during cargo handling as much as possible without impairing the speed of the cargo handling. It is an object of the present invention to provide a cargo handling vehicle equipped with a new detachable container that can solve all of the problems.

[0006]

In order to achieve the above object, the invention according to the first aspect of the present invention is directed to a lift arm having a hook arm capable of detachably connecting a container to a cargo handling frame mounted on a chassis. The drive arm is provided so as to be able to move up and down in the front-rear direction, and the dump arm is provided so as to be tiltable backward, and the container is unloaded between the cargo handling frame and the ground by the sole up and down rotation of the lift arm,
In addition, due to the tilting of the lift arm and the dump arm,
In a cargo handling vehicle equipped with a detachable container, wherein the container mounted on those arms is dumped, a position immediately before the container is dropped on the ground by the backward rotation of the lift arm is determined by the first sensor. It is characterized in that the operation of the driving means is slowly switched based on this detection signal so that the container is buffered and grounded, and according to this characteristic, the container is normally loaded or unloaded. When dumped,
The loading / unloading or dumping work is performed relatively quickly, and immediately before the container is grounded, the movement of the container is slowed down to significantly reduce the impact acting on the chassis and container when the ground is touched. Such deformation and damage can be prevented, and the generation of noise can be further reduced.

To achieve the above object, according to the second aspect of the present invention, in a cargo handling vehicle provided with the detachable container, the container is loaded on the cargo handling frame by the forward rotation of the lift arm. The position immediately before being installed there is detected by the second sensor, and the operation of the driving means is slowly switched based on the detection signal, so that the container is buffer-installed on the cargo handling frame. According to such a feature, when a container is normally unloaded and dumped, the unloading or dumping operation is performed relatively quickly, and the container is loaded on a chassis and installed there. Immediately before loading the container on the undercarriage, the impact on the undercarriage and the container is greatly reduced, According variations thereof, to prevent damage, it is possible to further reduce the generation of noise.

In order to achieve the above object, according to the third aspect of the present invention, in a cargo handling vehicle provided with the detachable container, the lift arm and the dump arm are mounted on those arms by integral lowering. The position immediately before the container is set on the cargo handling frame is detected by the second sensor, and the operation of the lift driving means is slowly switched based on the detection signal, so that the container is buffer-installed on the cargo handling frame. It is characterized by doing
According to such a feature, the container is normally unloaded,
Alternatively, when dumping, the unloading or dumping work is performed relatively quickly, and immediately before the dumped container descends and is installed on the cargo handling frame,
When the container is slowly lowered, the impact acting on the undercarriage or the container when the container is turned upside down can be greatly reduced, and the deformation and damage due to the impact can be prevented, and the noise can be further reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.

FIG. 1 is a side view of the cargo handling vehicle showing a state when the container is mounted on the undercarriage (during traveling), and FIG. 2 is a side view of the cargo handling vehicle showing a state when the container starts retreating (when unloading starts). FIG. 3 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground (when the container is tilted maximum), FIG. 4 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground, and FIG.
6 is a side view of the container handling vehicle showing a state of dumping the container, FIG. 6 is an enlarged side view of a main part of the cargo handling vehicle, FIG. 7 is a plan view along line 7-7 in FIG. 6, and FIG. FIG. 9 is an enlarged view of a portion viewed in the direction of arrow 9 in FIG. 7, FIG. 10 is an enlarged view of a portion viewed in the direction of arrow 10 in FIG. 6, and FIG.
6 is a schematic view of the first switch section along line 11-11, FIG. 12 is a schematic view of the second switch section along line 12-12 in FIG. 6, and FIG. 13 is a view along line 13-13 in FIG. FIG. 14 is a schematic diagram of the third and fifth switch units along the line 14-14 in FIG. 6, FIG. 15 is a hydraulic circuit diagram of the hook cylinder and the lift cylinder, and FIG. ,
FIG. 17 is a flowchart of a container unloading operation, FIG. 18 is a flowchart of a container loading operation, FIG. 19 is a flowchart of a container dumping operation, and FIG. 20 is a flowchart of the container dumping operation. It is a flowchart.

1 to 8, a cargo handling frame 1 is integrally mounted on a chassis F of a cargo handling vehicle V. The cargo handling frame 1 is formed in a rectangular frame shape with left and right vertical girders and a plurality of horizontal girders, and left and right guide rollers 2 are rotatably mounted on the right and left rear ends thereof. A container Ct described below, which rolls on the guide rollers 2, 2, is mounted on the cargo handling frame 1. A dump arm 3 is provided at the rear half of the cargo handling frame 1 so as to be tiltable rearward. The dump arm 3 is formed integrally with a horizontal girder at the rear end of the left and right vertical girder to form a fork with a front end opened in a plan view, and the rear end has the same axis as the rotation axis of the left and right guide rollers 2. It is pivotally supported so that it can tilt forward and backward. Wherein the left and right of the middle portion of the front end side of the dump arm 3, the bracket 3 _1, 3 ₁ a rear i.e. proximal end of the lift arm 4 via is contoured rotatably supported 9 in the front-rear direction. As shown in FIG. 7, the lift arm 4 is formed in a rectangular frame shape that is narrower than the dump arm 3 and is long and narrow in the front-rear direction, and the rear portion overlaps in the front-rear direction so as to fit inside the dump arm 3. However, most of the container Ct extends forward from the dump arm 3, and when it falls down, its upper surface is located higher than the dump arm 3, and the container Ct mounted on the chassis F It is supported on the upper surface of the lift arm 4 and on the left and right guide rollers 2 and 2. A drive means, that is, a lift cylinder 7 composed of a backward hydraulic cylinder is connected between a front portion of the chassis F and an intermediate portion of the lift arm 4. As shown in FIG. 7, the lift arm 4 can be turned up and down and back and forth.

The lower end of the hook arm 5 is connected to the front end of the lift arm 4 via a bracket 13 so as to be rotatable in the front-rear direction. As shown in FIGS. 6 and 8, the hook arm 5 has an L-shape when viewed from the side, and is formed in an inverted V-shape when viewed from the front, and the hook 6 is integrally provided at the upper end thereof. The hook 6 can be freely engaged and disengaged with an engaging portion 17 provided at an upper portion of the front surface of the container Ct. The lower part of the hook arm 5 is connected to the front part of the lift arm 4 so as to be pivotable back and forth so as to straddle the front part.

The front of the lift arm 4 and the hook arm 5
A hook cylinder driving means, that is, a hook cylinder 8 composed of a backward hydraulic cylinder is connected between the hook cylinder 8 and the intermediate portion of the hook cylinder 8.
As shown in (1), the hook arm 5 can be turned up and down in the front-rear direction of the chassis F, whereby the container Ct can be moved backward on the cargo handling frame 1.

As shown in FIGS. 6 to 10, on the left and right sides of the lift arm 4, the hook arm 5, and the dump arm 3, the lift arm 4 and the dump arm 3
And a pair of right and left lashing mechanisms L for lashing together in a straight line in the front-rear direction and releasing the lashing. Each lashing mechanism L is provided on one side of the front end of the dump arm 3 such that the lashing hook 10 is rotatably supported on one side of the rear part of the lift arm 4, and the lashing hook 10 is detachable. It is composed of a locked portion 11 that can be engaged, and a rod 12 whose length can be adjusted to connect the intermediate portion of the securing hook 10 and the base end of the hook arm 5 with pins, respectively. When the hook arm 5 is in the standing position, that is, the retracted position (the solid line position in FIG. 10), the rod 12 is pushed rearward (in the right direction in FIG. 10), and the securing hook 10 rotates in the securing direction. Then, the lift arm 4 and the dump arm 3 are integrally and linearly secured in the front-rear direction. Further, when the hook arm 5 is rotated rearward by the extension operation of the hook cylinder 8 (the position shown by the dashed line in FIG. 10), the rod 12 is moved forward (FIG. 10, leftward direction).
And the securing hook 10 is rotated in the securing release direction (clockwise direction in FIG. 10) and detaches from the locked portion 11, whereby the securing between the lift arm 4 and the dump arm 3 is released. The arms 4 and 3 are allowed to rotate separately.

As shown in FIGS. 1 to 5, an outrigger 15 is provided at the rear of the chassis F.
Is operated to stabilize the cargo handling vehicle V when loading or unloading or dumping the container Ct.

On the other hand, the container Ct mounted on the chassis F of the cargo handling vehicle V is formed in a box-like shape with a lid, and its open rear surface is closed by a rear gate 16, and the hook arm is provided on the upper front wall thereof. An engaging portion 17 that can be engaged with and disengaged from the hook 6 is provided, and a plurality of running wheels 18 made of casters are supported at the front and rear of the bottom.

Next, a process of loading and unloading the container Ct between the chassis F and the ground G and a process of dumping the container Ct on the chassis F will be described with reference to FIGS.

[0018] FIG. 1 shows a state in which the container Ct is mounted on the chassis F of the cargo handling vehicle V, that is, a running state of the vehicle.

[0019] As shown in FIG.
When the hook arm 5 is tilted backward by the extension operation of
The container Ct is pushed rearward on the left and right guide rollers 2 and 2 by the hook arm 5 and moves rearward. However, since the center of gravity CG of the container Ct is still on the chassis F, the container Ct does not tilt. Further, as the hook arm 5 rotates backward, the securing mechanism L is released as described above, and the securing between the lift arm 4 and the dump arm 3 is released, so that the lift arm 4 is free with respect to the dump arm 3. Can be rotated.

[0020] As shown in FIG.
When the arm is extended, the lift arm 4
Tilt with. As a result, the container Ct is guided by the left and right guide rollers 2 and 2 and moves rearward on the chassis F. When the center of gravity CG moves rearward of the chassis F, the container Ct is moved to the left and right guide rails 2 and 2. It tilts backward with the rotation center as a fulcrum, and its lower lower edge lands on the ground G.

[0021] As shown in FIG. 4, when the lift cylinder 7 continues to extend and reaches the maximum extension, the hook arm 5 is directed downward, and the container Ct is completely dropped on the ground G. Here, the hook 6 at the tip of the hook arm 5 is
When the container Ct is removed from the container 7, the container Ct is separated from the cargo handling vehicle V, and a loading operation or the like into the container Ct is performed.

[0022] In order to mount the container Ct on the ground G on the cargo handling frame 1, the above operations (1) to (4) may be performed in reverse.

[0023] Next, if the lift cylinder 7 is extended from the state where the container Ct is mounted on the cargo handling frame 1 shown in FIG. 1, that is, the state where the hook arm 5 is in the storage position, the securing mechanism L maintains the secured state. And the dump arm 3 and the lift arm 4 are tied together,
As shown in FIG. 5, the arms 3 and 4 are integrally tilted backward to dump the container Ct and discharge the contents in the container Ct to the outside. When the lift cylinder 7 is contracted, the container Ct can be dumped down and lowered on the cargo handling frame 1.

In the loading and unloading work and dumping work of the container Ct, if the operation speed of the lift cylinder 7 is increased in order to speed up the work, (1) the container Ct is unloaded, (2) When the tilting container Ct is mounted on the cargo handling frame 1, (3)
When the dumped container Ct is placed on the cargo handling frame 1, the container Ct or the chassis F of the cargo handling vehicle V
And a large impact is applied to the cargo handling frame 1 and noise is generated due to this, or the container Ct, the chassis F,
Alternatively, the cargo handling frame 1 or the like may be deformed or damaged. In this embodiment, the impact is reduced as much as possible to eliminate the possibility.

As shown in FIG. 6 and FIGS. 11 to 14, first to fifth sensors composed of proximity switches for detecting the rotation position of the lift arm 4 or the hook arm 5 are provided at appropriate places of the cargo handling vehicle V. S _{1 to} S ₅ are provided.

As shown in FIG. 11, the first sensor S ₁ is provided on the rear upper surface of the dump arm 3. This first sensor S
₁ is operated by the lift arm 4, and when the lift arm 4 is rotated backward, that is, when the container Ct is unloaded, immediately before the final backward rotation of the lift arm 4,
Actuated by the lift arm 4, described later,
The second switching valves V ₁ and V ₂ are switched to the slow side. In addition,
The first sensor S ₁ may be provided on the cargo handling frame 1 side or the lift arm 4 side instead of being provided on the dump arm 3.

As shown in FIG. 12, the second sensor S ₂ is provided on the chassis F side, that is, on the side beam of the cargo handling frame 1, and when the lift arm 4 rotates forward, that is, when the container Ct is loaded, the lift sensor 4 Just before the final forward rotation of
Operated by the lift arm 4, the second and third switching valves V ₂ and V ₃ described later are switched to the slow side. Incidentally, the second sensor S ₂ may be provided to the dump arm 3 side or lift arms 4 side.

As shown in FIG. 14, the third sensor S ₃ is provided at the front of the lift arm 4,
Is operated by its hook arm 5 when it rotates backward. Incidentally, the third sensor S ₃ may be provided on the hook arm 5 side.

As shown in FIG. 13, the fourth sensor S ₄ is provided on the undercarriage F side, that is, at the front of the cargo handling frame 1, and is activated by the lift arm 4 when the lift arm 4 is retracted. Incidentally, the fourth sensor S ₄ may be provided on the lift arm 4 side.

As shown in FIG. 14, the fifth sensor S ₅ is provided on the front portion of the lift arm 4, when the hook arm 5 is stored, is actuated by the hook arm 5. Incidentally, the fifth sensor S ₅ may be provided on the hook arm 5 side.

Next, a hydraulic circuit for operating the lift cylinder 7 and the hook cylinder 8 will be described with reference to FIG.
A control valve unit UV is connected to a hydraulic oil passage 20 that communicates between the hydraulic pump P and the oil sump T, which are driven through the hydraulic pump P. In this control valve unit UV, first, second and third switching valves V ₁ , V 3,
Provided V ₂ and V _3, the first switching inlet port of valve V ₁ is connected to the hydraulic fluid passage 20, also said hook cylinder its outlet port through the oil passage 22 connected to the pilot check valve 21 8 And the inlet ports of the second and third switching valves V ₂ and V ₃ are connected in parallel to the hydraulic oil passage 20, and the second switching valve V ₂ is connected to the outlet ports A and B with throttles and This is a three-position switching solenoid valve of an inlet port R connection type, and fixed throttles 23 and 24 are connected to the hydraulic oil passages at the left and right positions, respectively. Outlet port of the second switch valve V ₂ are connected to the lift cylinder 7 via an oil passage 26 connecting the counter balance valve 25. The third switching valve V ₃ is a closed center type three-position switching solenoid valve, and its outlet port is connected to the counter balance valve 25.
Is connected to the lift cylinder 7 via an oil passage 27 connected to the lift cylinder 7.

The expansion control of the hook cylinder 8 is performed by the switching control of the first switching valve V _1. That is, after driving the hydraulic pump P, be switched to the first changeover valve V ₁ to the right position, the hook arm 5 hooks cylinder 8 is extended actuated
The can be tilted backward, also be switched to the first changeover valve V ₁ to the left position, it can be stored tilts the lift cylinder 7 is contracted operating the hook arm 5 to the front.

The expansion and contraction control of the lift cylinder 7 is performed by switching control of the second and third switching valves V ₂ and V ₃ . When the second and third switching valves V ₂ and V ₃ are simultaneously switched to the left position or the right position, fixed throttles 23 and 24 are provided in the hydraulic oil passages at the left and right positions of the second switching valve. As a result, most of the pressure oil flowing through the hydraulic oil passage 20 is supplied to the lift cylinder 7 from the third switching valve V _{3 having} a small resistance via the counter balance valve 25,
Can be extended and retracted at a relatively high speed, and the lift arm 4 can be quickly raised and lowered forward or backward.

By the way while the second switching valve V ₂ left, was positioned on either the right position, switch the third switching valve V ₃ to the neutral position, pressure oil of the hydraulic oil passage 20 and the second switching valve V ₂ and is supplied to the lift cylinder 7 through the counter balance valve 25. At this time, fixed throttles 23 and 24 are provided in the pressure oil side oil passages at the left and right positions of the second switching valve. The amount of oil supplied per unit time to the lift cylinder 7 is limited, and the lift cylinder 7 is slowly extended and retracted, whereby the lift cylinder 7 is also slowly rotated back and forth.

As described above, the lift cylinder 7 is
When operating at high speed, the second and third switching valves V_Two, V_ThreeAt the same time
To explain the reason for switching to
Valve V _TwoWith the third switching valve V_ThreeSwitch
And the third switching valve V_ThreeFrom the second switching valve V_TwoThrough
Because of the inconvenience of returning to the sump T
In order to solve this inconvenience, the second switching valve V_TwoAll neutral positions
What is necessary is just to block, but if it does in this way, the 3rd switching valve
V_ThreeIs returned to the neutral position, the inertia of the lift cylinder 7
Neutral of 2nd switching valve even if oil tries to return to sump T by force
The block at the position makes it impossible to return to the sump T,
Abnormal high pressure in the road, damaging or breaking the hydraulic circuit
Occurs. From this, the second switching valve V_TwoIs as described above
The open center type is adopted.

FIG. 16 is a block diagram of the operation control of the cargo handling operation by the cargo handling vehicle V. The cargo handling operation is performed in the usual manner by a cargo handling operation switch, ie, a loading switch, an unloading switch, a dumping up switch, or a dumping switch. The control means including the operation control means and the lift arm control means are sequentially operated by the selective ON operation signal of the lowering switch, and the hook arm driving means, that is, the hook cylinder 8 and the lift arm drive are received in response to the control signal from the control means. The drive means including the means, that is, the lift cylinder 7 is driven and controlled.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS.

[Unloading Operation of Container Ct] (See FIG. 17) This is an operation of unloading the container Ct mounted on the cargo handling frame 1 of the chassis F to the ground G, and now turns on the unloading switch of the operation switch panel. When activated, the hook cylinder 8 is extended, and the hook arm 5 at the retracted position (substantially upright position) rotates rearward (see FIGS. 1 and 2). Thus the third sensor S ₃ is detected (see FIG. 14), rearward rotation of the hook arm 5 is stopped, the lift arm 4 the lift cylinder 7 to initiate extension is rotated backward, the lift The container Ct connected to the arm 4 moves backward and tilts backward. Immediately before grounding the rear end of the container Ct by the rotation continues to the rear of the lift arm 4, the first sensor S ₁ is detected by the lift arm 4 (see FIG. 11). According to this detection signal, the third switching valve V ₃ is switched to the neutral position. As a result, the pressurized oil is supplied to the lift cylinder 7 through the second switching valve, as described above, and the backward rotation of the lift arm 4 is slowed, and as a result, the container Ct is grounded (see FIG. 3).
Is carried out slowly in a cushioning manner, so as to alleviate the shock applied to the container Ct, the chassis F of the cargo handling vehicle V, the cargo handling frame 1 and the like at the time of grounding, and to prevent their deformation and damage,
In addition, the generation of noise can be significantly reduced. The operator confirms the completion of the grounding of the container Ct, completes the unloading operation of the container Ct to the ground G, and turns off the unloading switch.

The lowering operation of the container Ct may be completed by the full stroke of the lift cylinder 7 instead of completing the lowering operation of the container Ct on the ground by the operator's eye measurement. After confirming that the container Ct has been grounded, the lift arm 4 is stopped at the rearmost position by the full stroke of the lift cylinder 7, and the unloading operation of the container Ct to the ground G is completed, and the unloading switch is turned off. [Loading operation of container Ct] (see FIG. 18) This is an operation of loading the container Ct grounded on the ground G onto the chassis F of the cargo handling vehicle, and engaging the hook 6 at the tip of the lift arm 4 with the container Ct. When the loading switch of the operation switch board is turned ON after engaging with the portion 17, the lift cylinder 4 that is contracted and the lift arm 4 that is rotated rearward rotates forward and the container Ct
Is started to be loaded on the chassis F. The rotation continues to the front of the lift arms 4, in the just before the lift arm 4 is stored, the second sensor S ₂ is detected by the lift arm 4 (see FIG. 12). According to this detection signal, the third switching valve V is switched to the neutral position, the pressurized oil is supplied to the lift cylinder 7 only through the second switching valve, and the rotation of the lift arm 4 immediately before the storage is performed. It becomes slow, and as a result, the cargo handling frame 1 on the chassis F of the container Ct
The installation on the top is carried out slowly in a cushioning manner. At the time of installation, the shock applied to the container Ct, the chassis F, the cargo handling frame 1 and the like is alleviated, and their deformation and damage are prevented. Can be reduced. Container C
When t is set on the chassis F and the lift arm 4 returns to the retracted position, the fourth sensor S ₄ (see FIG. 13) is detected, and the forward rotation of the lift arm 4 is stopped. Is contracted to rotate the hook arm 5 forward to reach the storage position, the fifth sensor S ₅ (see FIG. 14) is detected, the forward rotation of the hook arm 5 is stopped, and the container Ct is stopped. Is completed, and the loading switch is turned off.

[Dumping work of container Ct] (FIG. 1)
9) This is an operation for dumping the container Ct on the chassis F, and the lift arm 4 and the dump arm 3 are tilted rearward integrally. In a state where the container Ct is installed on the chassis F and the lift cylinder 7 and the hook cylinder 8 are both stored, if the dump up switch of the operation switch board is turned ON, the lift arm 4 remains at the storage position. Therefore, while the lift arm 4 and the dump arm 3 are integrated by the securing operation of the securing mechanism L, the lift arm 4 and the dump arm 3 rise integrally by the extension operation of the lift cylinder 7, The container Ct tilts rearward around the pivot of the dump arm 3. The container C is moved by the maximum extension of the lift cylinder 7.
t is fully dumped (see FIG. 5). Then, the raising switch is turned off, and the container Ct is stopped at the dump position.

In this case, the second and third switching valves are simultaneously operated from beginning to end, and the pressure oil is mainly supplied to the lift cylinder 7 through the third switching valve V ₃ having low resistance, and the slow operation of the lift arm 4 is not performed. .

[Dump lowering operation of container Ct] (FIG. 2)
This operation is to lower the full-dumped container Ct and to set it down on the chassis F. When the dump-down switch of the operation switch panel is turned ON, the lift arm 4 is turned on.
, The lift arm 4 and the dump arm 3 descend while being integrated. Immediately before the container Ct is set down on the cargo handling frame 1 on the chassis F, the lift arm 4
Detects the second sensor S ₂ (see FIG. 12). Thus the third switching valve V ₃ is switched to the neutral position storage, pressure oil is supplied to the lift cylinder 7 through only the second switching valve, the container Ct is slowly lowered to the top spreader 1 undercarriage F Is done. As a result, the lowering of the container Ct onto the cargo handling frame 1 on the undercarriage F is buffered, and the shock applied to the container Ct, the undercarriage F, the cargo handling frame 1 and the like at the time of the lowering is alleviated, and their deformation and damage are caused. Can be prevented, and the generation of noise can be greatly reduced. When the lift arm 4 is stored together with the dump arm 3, the lift switch 4 allows the fourth switch (FIG.
3) is detected, the lowering of the lift arm 4 is completed, and the lowering switch is turned off.

Next, a second embodiment of the present invention will be described.

The second embodiment is slightly different from the first embodiment in the hydraulic circuit for controlling the operation of the lift cylinder. FIG. 21 shows the hydraulic circuit.
The second switching valve V ₂ ′ of the second embodiment is obtained by removing the fixed throttles 23 and 24 from the hydraulic oil passage at the left-right switching position of the second switching valve V ₂ of the first embodiment. And an oil passage 2 connecting the second switching valve V ₂ ′ and the lift cylinder 7.
6, a slow return valve, that is, a flow regulating valve with a check valve 30, 31 is connected upstream of the counter balance valve 25. The pressure oil flowing from the second switching valve V ₂ ′ to the oil passage 26 is The amount of oil is restricted and supplied to the lift cylinder 7 through the flow control valves 30 and 31 with check valves.

In the second embodiment, the second switching valve V
And ₂ ', and the check flow control valve 30, 31 cooperate with valve, which achieves the same function as the second switching valve V ₂ of the first embodiment, also in this second embodiment The same operation as in the first embodiment is achieved.

Next, a third embodiment of the present invention will be described.

The third embodiment also differs slightly from the first and second embodiments in the hydraulic circuit for operating the lift cylinder 7, and FIG. 22 shows the hydraulic circuit. In the third embodiment, the electromagnetic two-position flow control valve 40 instead of the second embodiment of the third switch valve V ₃ and the second embodiment of the check valve with flow control valve 30 and 31 together eliminated,
When the cargo handling vehicle V performs normal work, the flow control valves 40 and 41 are both switched to the right, and the pressure oil flowing through the oil passage 26 is Lift cylinder 7 without restriction of oil amount
To operate the lift cylinder 7 at a normal speed, and as described above, the first sensor S ₁ or the second sensor S ₁ .
When the detection sensor S _2, the receiving the detection signal 2
The two two-position flow control valves 40 and 41 are both switched to the right, and the amount of oil supplied to the lift cylinder 7 is reduced.

The third embodiment also has the same operation and effect as the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.

For example, in the above embodiment, the lift arm 4
Although the hook arms 5 are connected to each other by the hook cylinder 8 so that the hook arms 5 can rotate, the lift arm 4 and the hook arm 5 may be integrally formed in an L-shape. In this case, the third and fifth sensors S ₃ and S ₅ are unnecessary, and in this case, the securing and release of the lift arm 4 and the dump arm 3 can be performed by an automatic securing means such as another securing cylinder or the like. It is performed by manual tying means. Further, the hook cylinder 8 may be configured to be able to expand and contract with respect to the lift arm 4 back and forth. In this case, a sensor for detecting expansion and contraction of the hook arm 5 is provided, and a securing means for securing or releasing the two arms to the lift arm 4 in conjunction with the extension and contraction of the hook arm 5 is provided. In the above-described embodiment, the proximity switch is used as the sensor. However, a conventionally known switch having the same effect, such as a limit switch, may be used instead. Further, the hook provided at the tip of the hook arm 5 may be configured to be rotatable relative to the hook arm 5 by a cylinder or the like.

[0051]

As described above, according to the first aspect of the present invention, in the cargo handling vehicle equipped with the detachable container, the rearward rotation of the lift arm is ensured while ensuring the speed of normal cargo handling work. When the container is grounded from the undercarriage, the grounding speed of the container is slowed, and the impact on the container at that time is greatly reduced, preventing deformation and damage of the container, cargo handling frame, undercarriage, etc. And the generation of noise can be reduced.

According to the second aspect of the present invention, in a cargo handling vehicle equipped with a detachable container, the container is rotated forward by rotating the lift arm while ensuring the speed of normal cargo handling work. Slow down the speed when mounted on the chassis, then the container, cargo handling frame,
The impact on the chassis and the like can be greatly reduced to prevent their deformation and damage, and to reduce the generation of noise.

Further, according to the third aspect of the present invention, in the cargo handling vehicle equipped with a detachable container, the speed at which the dumped container is placed on the undercarriage is slowed down. The shock applied to the cargo handling frame, the undercarriage, etc. can be greatly reduced, their deformation and damage can be prevented, and the generation of noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a cargo handling vehicle showing a state when loading of a container is completed (during traveling).

FIG. 2 is a side view of the cargo handling vehicle showing a state at the time of starting retreating of the container (at the time of starting unloading).

FIG. 3 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground (when the container is tilted at a maximum).

FIG. 4 is a side view of the cargo handling vehicle showing a state where the container is in contact with the ground;

FIG. 5 is a side view of the container handling vehicle showing a state of dumping the container.

FIG. 6 is a side view of the cargo handling frame.

FIG. 7 is a plan view of the cargo handling frame.

8 is a sectional view taken along line 8-8 in FIG. 6;

FIG. 9 is an enlarged view of a part viewed from an arrow 9 in FIG. 7;

FIG. 10 is an enlarged view of a part viewed from an arrow 10 in FIG. 6;

FIG. 11 is a schematic view taken along line 11-11 of FIG. 6;

FIG. 12 is a schematic view taken along line 12-12 of FIG. 6;

FIG. 13 is a schematic view taken along line 13-13 of FIG. 6;

FIG. 14 is a schematic view taken along the line 14-14 in FIG. 6;

FIG. 15 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder.

FIG. 16 is an operation block diagram of a cargo handling operation.

FIG. 17 is a flowchart of a container unloading operation.

FIG. 18 is a flowchart of a container loading operation.

FIG. 19 is a flowchart of a container dumping operation.

FIG. 20 is a flowchart of a container dumping operation.

FIG. 21 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder (second embodiment).

FIG. 22 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder (third embodiment).

[Explanation of symbols]

1 ···· Cargo handling frame 3 ····· Dump arm 4 ····· Lift arm 5 ····· Hook arm 7 ····· Drive means the (lift cylinder) Ct · · · · · · container F · · · · · · · undercarriage G · · · · · · · ground S ₁ · · · · · · first sensor S ₂ · · · · · · 2 sensors

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 13, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Cargo handling vehicle equipped with a detachable container

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable container capable of loading and unloading a container mounted on an undercarriage between the undercarriage and the ground and dumping the undercarriage on the undercarriage. The present invention relates to a cargo handling vehicle provided with:

[0002]

2. Description of the Related Art Conventionally, a container is mounted on a chassis of a cargo handling vehicle via a lift arm and a dump arm, and the container is unloaded between the chassis and the ground by rotating the lift arm back and forth. A cargo handling vehicle having a detachable container in which the container is dumped by integrally tilting the lift arm and the dump arm is known (for example, see Japanese Utility Model Registration No. 2525461 and Japanese Patent Application Laid-Open No. 48-64617).

[0003]

However, in such a cargo-handling vehicle, the container mounted thereon is relatively large and heavy, so that when the container is dropped from the chassis to the ground, the container is not grounded. When a container is loaded on a chassis or when a dumped container is placed on the chassis, impacts are applied to the container, the chassis, and the like, which causes noise and deforms the container and the chassis. .

In order to solve such a problem, the operating speed of the lift arm or the dump arm may be reduced. However, this causes another problem that the speed of the cargo handling operation is impaired.

The present invention has been made in view of the above circumstances, and it is possible to reduce the impact on a chassis or a container during cargo handling as much as possible without impairing the speed of the cargo handling. It is an object of the present invention to provide a cargo handling vehicle equipped with a new detachable container that can solve all of the problems.

[0006]

In order to achieve the above object, the invention according to the first aspect of the present invention is directed to a lift arm having a hook arm capable of detachably connecting a container to a cargo handling frame mounted on a chassis. The drive arm is provided so as to be able to move up and down in the front-rear direction, and the dump arm is provided so as to be tiltable backward, and the container is unloaded between the cargo handling frame and the ground by the sole up and down rotation of the lift arm,
In addition, due to the tilting of the lift arm and the dump arm,
In a cargo handling vehicle equipped with a detachable container, wherein the container mounted on those arms is dumped, a position immediately before the container is dropped on the ground by the backward rotation of the lift arm is determined by the first sensor. It is characterized in that the operation of the driving means is slowly switched based on this detection signal so that the container is buffered and grounded, and according to this characteristic, the container is normally loaded or unloaded. When dumped,
The loading / unloading or dumping work is performed relatively quickly, and immediately before the container is grounded, the movement of the container is slowed down to significantly reduce the impact acting on the chassis and container when the ground is touched. Such deformation and damage can be prevented, and the generation of noise can be further reduced.

To achieve the above object, according to the second aspect of the present invention, in a cargo handling vehicle provided with the detachable container, the container is loaded on the cargo handling frame by the forward rotation of the lift arm. The position immediately before being installed there is detected by the second sensor, and the operation of the driving means is slowly switched based on the detection signal, so that the container is buffer-installed on the cargo handling frame. According to such a feature, when a container is normally unloaded and dumped, the unloading or dumping operation is performed relatively quickly, and the container is loaded on a chassis and installed there. Immediately before loading the container on the undercarriage, the impact on the undercarriage and the container is greatly reduced, According variations thereof, to prevent damage, it is possible to further reduce the generation of noise.

In order to achieve the above object, according to the third aspect of the present invention, in a cargo handling vehicle provided with the detachable container, the lift arm and the dump arm are mounted on those arms by integral lowering. The position immediately before the container is set on the cargo handling frame is detected by the second sensor, and the operation of the lift driving means is slowly switched based on the detection signal, so that the container is buffer-installed on the cargo handling frame. It is characterized by doing
According to such a feature, the container is normally unloaded,
Alternatively, when dumping, the unloading or dumping work is performed relatively quickly, and immediately before the dumped container descends and is installed on the cargo handling frame,
When the container is slowly lowered, the impact acting on the undercarriage or the container when the container is turned upside down can be greatly reduced, and the deformation and damage due to the impact can be prevented, and the noise can be further reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.

FIG. 1 is a side view of the cargo handling vehicle showing a state when the container is mounted on the undercarriage (during traveling), and FIG. 2 is a side view of the cargo handling vehicle showing a state when the container starts retreating (when unloading starts). FIG. 3 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground (when the container is tilted maximum), FIG. 4 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground, and FIG.
6 is a side view of the container handling vehicle showing a state of dumping the container, FIG. 6 is an enlarged side view of a main part of the cargo handling vehicle, FIG. 7 is a plan view along line 7-7 in FIG. 6, and FIG. FIG. 9 is an enlarged view of a portion viewed in the direction of arrow 9 in FIG. 7, FIG. 10 is an enlarged view of a portion viewed in the direction of arrow 10 in FIG. 6, and FIG.
6 is a schematic view of the first switch section along line 11-11, FIG. 12 is a schematic view of the second switch section along line 12-12 in FIG. 6, and FIG. 13 is a view along line 13-13 in FIG. FIG. 14 is a schematic diagram of the third and fifth switch units along the line 14-14 in FIG. 6, FIG. 15 is a hydraulic circuit diagram of the hook cylinder and the lift cylinder, and FIG. ,
FIG. 17 is a flowchart of a container unloading operation, FIG. 18 is a flowchart of a container loading operation, FIG. 19 is a flowchart of a container dumping operation, and FIG. 20 is a flowchart of the container dumping operation. It is a flowchart.

1 to 8, a cargo handling frame 1 is integrally mounted on a chassis F of a cargo handling vehicle V. The cargo handling frame 1 is formed in a rectangular frame shape with left and right vertical girders and a plurality of horizontal girders, and left and right guide rollers 2 are rotatably mounted on the right and left rear ends thereof. A container Ct described below, which rolls on the guide rollers 2, 2, is mounted on the cargo handling frame 1. A dump arm 3 is provided at the rear half of the cargo handling frame 1 so as to be tiltable rearward. The dump arm 3 is formed integrally with a horizontal girder at the rear end of the left and right vertical girder to form a fork with a front end opened in a plan view, and the rear end has the same axis as the rotation axis of the left and right guide rollers 2. It is pivotally supported so that it can tilt forward and backward. Wherein the left and right of the middle portion of the front end side of the dump arm 3, the bracket 3 _1, 3 ₁ a rear i.e. proximal end of the lift arm 4 via is contoured rotatably supported 9 in the front-rear direction. As shown in FIG. 7, the lift arm 4 is formed in a rectangular frame shape that is narrower than the dump arm 3 and is long and narrow in the front-rear direction, and the rear portion overlaps in the front-rear direction so as to fit inside the dump arm 3. However, most of the container Ct extends forward from the dump arm 3, and when it falls down, its upper surface is located higher than the dump arm 3, and the container Ct mounted on the chassis F It is supported on the upper surface of the lift arm 4 and on the left and right guide rollers 2 and 2. A drive means, that is, a lift cylinder 7 composed of a backward hydraulic cylinder is connected between a front portion of the chassis F and an intermediate portion of the lift arm 4. As shown in FIG. 7, the lift arm 4 can be turned up and down and back and forth.

The lower end of the hook arm 5 is connected to the front end of the lift arm 4 via a bracket 13 so as to be rotatable in the front-rear direction. As shown in FIGS. 6 and 8, the hook arm 5 has an L-shape when viewed from the side, and is formed in an inverted V-shape when viewed from the front, and the hook 6 is integrally provided at the upper end thereof. The hook 6 can be freely engaged and disengaged with an engaging portion 17 provided at an upper portion of the front surface of the container Ct. The lower part of the hook arm 5 is connected to the front part of the lift arm 4 so as to be pivotable back and forth so as to straddle the front part.

The front of the lift arm 4 and the hook arm 5
A hook cylinder driving means, that is, a hook cylinder 8 composed of a backward hydraulic cylinder is connected between the hook cylinder 8 and the intermediate portion of the hook cylinder 8.
As shown in (1), the hook arm 5 can be turned up and down in the front-rear direction of the chassis F, whereby the container Ct can be moved backward on the cargo handling frame 1.

As shown in FIGS. 6 to 10, on the left and right sides of the lift arm 4, the hook arm 5, and the dump arm 3, the lift arm 4 and the dump arm 3
And a pair of right and left lashing mechanisms L for lashing together in a straight line in the front-rear direction and releasing the lashing. Each lashing mechanism L is provided on one side of the front end of the dump arm 3 such that the lashing hook 10 is rotatably supported on one side of the rear part of the lift arm 4, and the lashing hook 10 is detachable. It is composed of a locked portion 11 that can be engaged, and a rod 12 whose length can be adjusted to connect the intermediate portion of the securing hook 10 and the base end of the hook arm 5 with pins, respectively. When the hook arm 5 is in the standing position, that is, the retracted position (the solid line position in FIG. 10), the rod 12 is pushed rearward (in the right direction in FIG. 10), and the securing hook 10 rotates in the securing direction. Then, the lift arm 4 and the dump arm 3 are integrally and linearly secured in the front-rear direction. Further, when the hook arm 5 is rotated rearward by the extension operation of the hook cylinder 8 (the position shown by the dashed line in FIG. 10), the rod 12 is moved forward (FIG. 10, leftward direction).
And the securing hook 10 is rotated in the securing release direction (clockwise direction in FIG. 10) and detaches from the locked portion 11, whereby the securing between the lift arm 4 and the dump arm 3 is released. The arms 4 and 3 are allowed to rotate separately.

As shown in FIGS. 1 to 5, an outrigger 15 is provided at the rear of the chassis F.
Is operated to stabilize the cargo handling vehicle V when loading or unloading or dumping the container Ct.

On the other hand, the container Ct mounted on the chassis F of the cargo handling vehicle V is formed in a box-like shape with a lid, and its open rear surface is closed by a rear gate 16, and the hook arm is provided on the upper front wall thereof. An engaging portion 17 that can be engaged with and disengaged from the hook 6 is provided, and a plurality of running wheels 18 made of casters are supported at the front and rear of the bottom.

Next, a process of loading and unloading the container Ct between the chassis F and the ground G and a process of dumping the container Ct on the chassis F will be described with reference to FIGS.

[0018] FIG. 1 shows a state in which the container Ct is mounted on the chassis F of the cargo handling vehicle V, that is, a running state of the vehicle.

[0019] As shown in FIG.
When the hook arm 5 is tilted backward by the extension operation of
The container Ct is pushed rearward on the left and right guide rollers 2 and 2 by the hook arm 5 and moves rearward. However, since the center of gravity CG of the container Ct is still on the chassis F, the container Ct does not tilt. Further, as the hook arm 5 rotates backward, the securing mechanism L is released as described above, and the securing between the lift arm 4 and the dump arm 3 is released, so that the lift arm 4 is free with respect to the dump arm 3. Can be rotated.

[0020] As shown in FIG.
When the arm is extended, the lift arm 4
Tilt with. As a result, the container Ct is guided by the left and right guide rollers 2 and 2 and moves rearward on the chassis F. When the center of gravity CG moves rearward of the chassis F, the container Ct is moved to the left and right guide rails 2 and 2. It tilts backward with the rotation center as a fulcrum, and its lower lower edge lands on the ground G.

[0021] As shown in FIG. 4, when the lift cylinder 7 continues to extend and reaches the maximum extension, the hook arm 5 is directed downward, and the container Ct is completely dropped on the ground G. Here, the hook 6 at the tip of the hook arm 5 is
When the container Ct is removed from the container 7, the container Ct is separated from the cargo handling vehicle V, and a loading operation or the like into the container Ct is performed.

[0022] In order to mount the container Ct on the ground G on the cargo handling frame 1, the above operations (1) to (4) may be performed in reverse.

[0023] Next, if the lift cylinder 7 is extended from the state where the container Ct is mounted on the cargo handling frame 1 shown in FIG. 1, that is, the state where the hook arm 5 is in the storage position, the securing mechanism L maintains the secured state. And the dump arm 3 and the lift arm 4 are tied together,
As shown in FIG. 5, the arms 3 and 4 are integrally tilted backward to dump the container Ct and discharge the contents in the container Ct to the outside. When the lift cylinder 7 is contracted, the container Ct can be dumped down and lowered on the cargo handling frame 1.

In the loading and unloading work and dumping work of the container Ct, if the operation speed of the lift cylinder 7 is increased in order to speed up the work, (1) the container Ct is unloaded, when grounded to the ground on <br/> G, is placed (2) when the container Ct are tilted is mounted on spreader 1, the (3) dump raised the container Ct is on spreader 1 In some cases, a large impact is applied to the container Ct, the chassis F of the cargo handling vehicle V, and the cargo handling frame 1 to generate noise or deform the container Ct, the chassis F, the cargo handling frame 1, or the like. In this embodiment, the impact is reduced as much as possible to eliminate the risk.

As shown in FIG. 6 and FIGS. 11 to 14, first to fifth sensors composed of proximity switches for detecting the rotation position of the lift arm 4 or the hook arm 5 are provided at appropriate places of the cargo handling vehicle V. S _{1 to} S ₅ are provided.

As shown in FIG. 11, the first sensor S ₁ is provided on the rear upper surface of the dump arm 3. This first sensor S
₁ is operated by the lift arm 4, and when the lift arm 4 is rotated backward, that is, when the container Ct is unloaded, immediately before the final backward rotation of the lift arm 4,
Actuated by the lift arm 4, described later,
The second switching valves V ₁ and V ₂ are switched to the slow side. In addition,
The first sensor S ₁ may be provided on the cargo handling frame 1 side or the lift arm 4 side instead of being provided on the dump arm 3.

As shown in FIG. 12, the second sensor S ₂ is provided on the chassis F side, that is, on the side beam of the cargo handling frame 1, and when the lift arm 4 rotates forward, that is, when the container Ct is loaded, the lift sensor 4 Just before the final forward rotation of
Operated by the lift arm 4, the second and third switching valves V ₂ and V ₃ described later are switched to the slow side. Incidentally, the second sensor S ₂ may be provided to the dump arm 3 side or lift arms 4 side.

As shown in FIG. 14, the third sensor S ₃ is provided at the front of the lift arm 4,
Is operated by its hook arm 5 when it rotates backward. Incidentally, the third sensor S ₃ may be provided on the hook arm 5 side.

As shown in FIG. 13, the fourth sensor S ₄ is provided on the undercarriage F side, that is, at the front of the cargo handling frame 1, and is activated by the lift arm 4 when the lift arm 4 is retracted. Incidentally, the fourth sensor S ₄ may be provided on the lift arm 4 side.

As shown in FIG. 14, the fifth sensor S ₅ is provided on the front portion of the lift arm 4, when the hook arm 5 is stored, is actuated by the hook arm 5. Incidentally, the fifth sensor S ₅ may be provided on the hook arm 5 side.

[0031] Next, a hydraulic circuit for operating the lifting cylinder 7 and the hook cylinder 8 to be described with reference to FIG. 1 5, PTO by the running engine of the cargo handling vehicle V
A control valve unit UV is connected to a hydraulic oil passage 20 that communicates between the hydraulic pump P and the oil sump T, which are driven through the hydraulic pump P. In this control valve unit UV, first, second and third switching valves V ₁ , V 3,
Provided V ₂ and V _3, the first switching inlet port of valve V ₁ is connected to the hydraulic fluid passage 20, also said hook cylinder its outlet port through the oil passage 22 connected to the pilot check valve 21 8 And the inlet ports of the second and third switching valves V ₂ and V ₃ are connected in parallel to the hydraulic oil passage 20, and the second switching valve V ₂ is connected to the outlet ports A and B with throttles and This is a three-position switching solenoid valve of an inlet port R connection type, and fixed throttles 23 and 24 are connected to the hydraulic oil passages at the left and right positions, respectively. Outlet port of the second switch valve V ₂ are connected to the lift cylinder 7 via an oil passage 26 connecting the counter balance valve 25. The third switching valve V ₃ is a closed center type three-position switching solenoid valve, and its outlet port is connected to the counter balance valve 25.
Is connected to the lift cylinder 7 via an oil passage 27 connected to the lift cylinder 7.

The expansion control of the hook cylinder 8 is performed by the switching control of the first switching valve V _1. That is, after driving the hydraulic pump P, be switched to the first changeover valve V ₁ to the right position, the hook arm 5 hooks cylinder 8 is extended actuated
The can be tilted backward, also be switched to the first changeover valve V ₁ to the left position, can hook the cylinder 8 is contracted operated stores tilts the hook arm 5 to the front.

The expansion and contraction control of the lift cylinder 7 is performed by switching control of the second and third switching valves V ₂ and V ₃ . When the second and third switching valves V ₂ and V ₃ are simultaneously switched to the left position or the right position, fixed throttles 23 and 24 are provided in the hydraulic oil passages at the left and right positions of the second switching valve. As a result, most of the pressure oil flowing through the hydraulic oil passage 20 is supplied to the lift cylinder 7 from the third switching valve V _{3 having} a small resistance via the counter balance valve 25,
Can be extended and retracted at a relatively high speed, and the lift arm 4 can be quickly raised and lowered forward or backward.

By the way while the second switching valve V ₂ left, was positioned on either the right position, switch the third switching valve V ₃ to the neutral position, pressure oil of the hydraulic oil passage 20 and the second switching valve V ₂ and is supplied to the lift cylinder 7 through the counter balance valve 25. At this time, fixed throttles 23 and 24 are provided in the pressure oil side oil passages at the left and right positions of the second switching valve. The amount of oil supplied per unit time to the lift cylinder 7 is limited, and the lift cylinder 7 is slowly extended and retracted, whereby the lift cylinder 7 is also slowly rotated back and forth.

As described above, the lift cylinder 7 is
When operating at high speed, the second and third switching valves V_Two, V_ThreeAt the same time
To explain the reason for switching to
Valve V _TwoWith the third switching valve V_ThreeSwitch
And the third switching valve V_ThreeFrom the second switching valve V_TwoThrough
Because of the inconvenience of returning to the sump T
In order to solve this inconvenience, the second switching valve V_TwoAll neutral positions
What is necessary is just to block, but if it does in this way, the 3rd switching valve
V_ThreeIs returned to the neutral position, the inertia of the lift cylinder 7
Neutral of 2nd switching valve even if oil tries to return to sump T by force
The block at the position makes it impossible to return to the sump T,
Abnormal high pressure in the road, damaging or breaking the hydraulic circuit
Occurs. From this, the second switching valve V_TwoIs as described above
The open center type is adopted.

FIG. 16 is a block diagram of the operation control of the cargo handling operation by the cargo handling vehicle V. The cargo handling operation is performed in the usual manner by a cargo handling operation switch, ie, a loading switch, an unloading switch, a dumping up switch, or a dumping switch. The control means including the operation control means and the lift arm control means are sequentially operated by the selective ON operation signal of the lowering switch, and the hook arm driving means, that is, the hook cylinder 8 and the lift arm drive are received in response to the control signal from the control means. The drive means including the means, that is, the lift cylinder 7 is driven and controlled.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS.

[Unloading Operation of Container Ct] (See FIG. 17) This is an operation of unloading the container Ct mounted on the cargo handling frame 1 of the chassis F to the ground G, and now turns on the unloading switch of the operation switch panel. When activated, the hook cylinder 8 is extended, and the hook arm 5 at the retracted position (substantially upright position) rotates rearward (see FIGS. 1 and 2). Thus the third sensor S ₃ is detected (see FIG. 14), rearward rotation of the hook arm 5 is stopped, the lift arm 4 the lift cylinder 7 to initiate extension is rotated backward, the lift The container Ct connected to the arm 4 moves backward and tilts backward. Immediately before the container Ct is ground by the rotation continues to the rear of the lift arm 4,
The first sensor S ₁ is detected by the lift arm 4 (see FIG. 11). According to this detection signal, the third
Switching valve V ₃ is switched to the neutral position. Thereby, as described above, the pressurized oil is supplied to the lift cylinder 7 through the second switching valve, and the backward rotation of the lift arm 4 is slowed. As a result, the grounding of the container Ct (see FIG. 4 ) The shock is applied slowly to cushion the container Ct, the undercarriage F of the cargo handling vehicle V, the cargo handling frame 1 and the like at the time of the grounding, and alleviates the deformation and damage of the container Ct. Can be reduced. The operator confirms the completion of the grounding of the container Ct, completes the unloading operation of the container Ct to the ground G, and turns off the unloading switch.

The lowering operation of the container Ct may be completed by the full stroke of the lift cylinder 7 instead of completing the lowering operation of the container Ct on the ground by the operator's eye measurement. After confirming that the container Ct has been grounded, the lift arm 4 is stopped at the rearmost position by the full stroke of the lift cylinder 7, and the unloading operation of the container Ct to the ground G is completed, and the unloading switch is turned off. [Loading operation of container Ct] (see FIG. 18) This is an operation of loading the container Ct grounded on the ground G onto the chassis F of the cargo handling vehicle, and engaging the hook 6 at the tip of the lift arm 4 with the container Ct. When the loading switch of the operation switch board is turned ON after engaging with the portion 17, the lift cylinder 4 that is contracted and the lift arm 4 that is rotated rearward rotates forward and the container Ct
Is started to be loaded on the chassis F. The rotation continues to the front of the lift arms 4, in the just before the lift arm 4 is stored, the second sensor S ₂ is detected by the lift arm 4 (see FIG. 12). According to this detection signal, the third switching valve V is switched to the neutral position, the pressurized oil is supplied to the lift cylinder 7 only through the second switching valve, and the rotation of the lift arm 4 immediately before the storage is performed. It becomes slow, and as a result, the cargo handling frame 1 on the chassis F of the container Ct
The installation on the top is carried out slowly in a cushioning manner. At the time of installation, the shock applied to the container Ct, the undercarriage F, the cargo handling frame 1 and the like is reduced, and their deformation and damage are prevented. Can be reduced. Container C
When t is set on the chassis F and the lift arm 4 returns to the storage position, the fourth sensor S ₄ (see FIG. 13) is detected, the forward rotation of the lift arm 4 is stopped, and then the hook cylinder 8 Is retracted to rotate the hook arm 5 forward to reach the storage position, the fifth sensor S ₅ (see FIG. 14) is detected, the forward rotation of the hook arm 5 is stopped, and the container Ct is stopped. Is completed, and the loading switch is turned off.

[Dumping work of container Ct] (FIG. 1)
9) This is an operation for dumping the container Ct on the chassis F, and the lift arm 4 and the dump arm 3 are tilted rearward integrally. In a state where the container Ct is installed on the chassis F and the lift cylinder 7 and the hook cylinder 8 are both stored, if the dump up switch of the operation switch panel is turned ON, the hook arm 5 remains at the storage position. Therefore, while the lift arm 4 and the dump arm 3 are integrated by the securing operation of the securing mechanism L, the lift arm 4 and the dump arm 3 rise integrally by the extension operation of the lift cylinder 7, The container Ct tilts rearward around the pivot of the dump arm 3. The container C is moved by the maximum extension of the lift cylinder 7.
t is fully dumped (see FIG. 5). Then, the raising switch is turned off, and the container Ct is stopped at the dump position.

In this case, the second and third switching valves are simultaneously operated from beginning to end, and the pressure oil is mainly supplied to the lift cylinder 7 through the third switching valve V ₃ having low resistance, and the slow operation of the lift arm 4 is not performed. .

[Dump lowering operation of container Ct] (FIG. 2)
This operation is to lower the full-dumped container Ct and to set it down on the chassis F. When the dump-down switch of the operation switch panel is turned ON, the lift arm 4 is turned on.
, The lift arm 4 and the dump arm 3 descend while being integrated. Immediately before the container Ct is set down on the cargo handling frame 1 on the chassis F, the lift arm 4
Detects the second sensor S ₂ (see FIG. 12). Thus the third switching valve V ₃ is switched to the neutral position storage, pressure oil is supplied to the lift cylinder 7 through only the second switching valve, the container Ct is slowly lowered to the top spreader 1 undercarriage F Is done. As a result, the lowering of the container Ct onto the cargo handling frame 1 on the undercarriage F is buffered, and the shock applied to the container Ct, the undercarriage F, the cargo handling frame 1 and the like at the time of the lowering is alleviated, and their deformation and damage are caused. Can be prevented, and the generation of noise can be greatly reduced. When the lift arm 4 is stored together with the dump arm 3, the lift switch 4 allows the fourth switch (FIG.
3) is detected, the lowering of the lift arm 4 is completed, and the lowering switch is turned off.

Next, a second embodiment of the present invention will be described.

The second embodiment is slightly different from the first embodiment in the hydraulic circuit for controlling the operation of the lift cylinder. FIG. 21 shows the hydraulic circuit.
The second switching valve V ₂ ′ of the second embodiment is obtained by removing the fixed throttles 23 and 24 from the hydraulic oil passage at the left-right switching position of the second switching valve V ₂ of the first embodiment. And an oil passage 2 connecting the second switching valve V ₂ ′ and the lift cylinder 7.
6, a slow return valve, that is, a flow regulating valve with a check valve 30, 31 is connected upstream of the counter balance valve 25. The pressure oil flowing from the second switching valve V ₂ ′ to the oil passage 26 is The amount of oil is restricted and supplied to the lift cylinder 7 through the flow control valves 30 and 31 with check valves.

In the second embodiment, the second switching valve V
And ₂ ', and the check flow control valve 30, 31 cooperate with valve, which achieves the same function as the second switching valve V ₂ of the first embodiment, also in this second embodiment The same operation as in the first embodiment is achieved.

Next, a third embodiment of the present invention will be described.

The third embodiment also differs slightly from the first and second embodiments in the hydraulic circuit for operating the lift cylinder 7, and FIG. 22 shows the hydraulic circuit. In the third embodiment, the electromagnetic two-position flow control valve 40 instead of the second embodiment of the third switch valve V ₃ and the second embodiment of the check valve with flow control valve 30 and 31 together eliminated,
When the cargo handling vehicle V performs normal work, the flow control valves 40 and 41 are both switched to the right, and the pressure oil flowing through the oil passage 26 is Lift cylinder 7 without restriction of oil amount
To operate the lift cylinder 7 at a normal speed, and as described above, the first sensor S ₁ or the second sensor S ₁ .
When the detection sensor S _2, the receiving the detection signal 2
The two two-position flow control valves 40 and 41 are both switched to the right, and the amount of oil supplied to the lift cylinder 7 is reduced.

The third embodiment also has the same operation and effect as the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.

For example, in the above embodiment, the lift arm 4
Although the hook arms 5 are connected to each other by the hook cylinder 8 so that the hook arms 5 can rotate, the lift arm 4 and the hook arm 5 may be integrally formed in an L-shape. In this case, the third and fifth sensors S ₃ and S ₅ are unnecessary, and in this case, the securing and release of the lift arm 4 and the dump arm 3 can be performed by an automatic securing means such as another securing cylinder or the like. It is performed by manual tying means. Further, the hook arm 5 may be configured to be able to expand and contract with respect to the lift arm 4 back and forth. In this case, a sensor for detecting expansion and contraction of the hook arm 5 is provided, and a securing means for securing or releasing the two arms to the lift arm 4 in conjunction with the extension and contraction of the hook arm 5 is provided. In the above-described embodiment, the proximity switch is used as the sensor. However, a conventionally known switch having the same effect, such as a limit switch, may be used instead. Further, the hook provided at the tip of the hook arm 5 may be configured to be rotatable relative to the hook arm 5 by a cylinder or the like.

[0051]

As described above, according to the first aspect of the present invention, in the cargo handling vehicle equipped with the detachable container, the rearward rotation of the lift arm is ensured while ensuring the speed of normal cargo handling work. When the container is grounded from the undercarriage, the grounding speed of the container is slowed, and the impact on the container at that time is greatly reduced, preventing deformation and damage of the container, cargo handling frame, undercarriage, etc. And the generation of noise can be reduced.

According to the second aspect of the present invention, in a cargo handling vehicle equipped with a detachable container, the container is rotated forward by rotating the lift arm while ensuring the speed of normal cargo handling work. Slow down the speed when mounted on the chassis, then the container, cargo handling frame,
The impact on the chassis and the like can be greatly reduced to prevent their deformation and damage, and to reduce the generation of noise.

Further, according to the third aspect of the present invention, in the cargo handling vehicle equipped with a detachable container, the speed at which the dumped container is placed on the undercarriage is slowed down. The shock applied to the cargo handling frame, the undercarriage, etc. can be greatly reduced, their deformation and damage can be prevented, and the generation of noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a cargo handling vehicle showing a state when loading of a container is completed (during traveling).

FIG. 2 is a side view of the cargo handling vehicle showing a state at the time of starting retreating of the container (at the time of starting unloading).

FIG. 3 is a side view of the cargo handling vehicle showing a state when the container is in contact with the ground (when the container is tilted at a maximum).

FIG. 4 is a side view of the cargo handling vehicle showing a state where the container is in contact with the ground;

FIG. 5 is a side view of the container handling vehicle showing a state of dumping the container.

FIG. 6 is a side view of the cargo handling frame.

FIG. 7 is a plan view of the cargo handling frame.

8 is a sectional view taken along line 8-8 in FIG. 6;

FIG. 9 is an enlarged view of a portion viewed in the direction of arrow 9 in FIG. 7;

FIG. 10 is an enlarged view of a part viewed from an arrow 10 in FIG. 6;

FIG. 11 is a schematic view taken along line 11-11 of FIG. 6;

FIG. 12 is a schematic view taken along line 12-12 of FIG. 6;

FIG. 13 is a schematic view taken along line 13-13 of FIG. 6;

FIG. 14 is a schematic view taken along the line 14-14 in FIG. 6;

FIG. 15 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder.

FIG. 16 is an operation block diagram of a cargo handling operation.

FIG. 17 is a flowchart of a container unloading operation.

FIG. 18 is a flowchart of a container loading operation.

FIG. 19 is a flowchart of a container dumping operation.

FIG. 20 is a flowchart of a container dumping operation.

FIG. 21 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder (second embodiment).

FIG. 22 is a hydraulic circuit diagram of a hook cylinder and a lift cylinder (third embodiment).

[Explanation of reference numerals] 1 ... Loading frame 3 ... Dump arm 4 ... Lift arm 5 ... Hook arm 7 ... ... driving means (lift cylinder) Ct · · · · · · container F · · · · · · · undercarriage G · · · · · · · ground S ₁ · · · · · · first sensor S ₂ · · .... Second sensor

Claims (3)

[Claims] 1. A lifting means (4) having a hook arm (5) capable of detachably connecting a container (Ct) to a cargo handling frame (1) mounted on a chassis (F). ), The dump arm (3) is provided so as to be tiltable backward in the front-rear direction, and the container (C) is provided by the single up-and-down rotation of the lift arm (4).
t) is loaded and unloaded between the cargo handling frame (1) and the ground (G), and the lift arm (4) and the dump arm (3) are integrally tilted so that the arms (4, 3) are moved.
In a cargo handling vehicle equipped with a detachable container configured to dump the container (Ct) mounted thereon, the container (Ct) is lowered to the ground (G) by the backward rotation of the lift arm (4). The first sensor (S ₁ ) detects the position immediately before the operation, and the operation of the driving means (7) is slowly switched based on this detection signal so that the container (Ct) is buffered and grounded. A cargo handling vehicle provided with a detachable container. 2. A lifting means (4) having a hook arm (5) capable of detachably connecting a container (Ct) to a cargo handling frame (1) mounted on a chassis (F). ), The dump arm (3) is provided so as to be tiltable backward in the front-rear direction, and the container (C) is provided by the single up-and-down rotation of the lift arm (4).
t) is loaded and unloaded between the cargo handling frame (1) and the ground (G), and the lift arm (4) and the dump arm (3) are integrally tilted so that the arms (4, 3) are moved.
In a cargo handling vehicle having a detachable container configured to dump the container (Ct) mounted thereon, the container (Ct) is placed on the cargo handling frame (1) by the forward rotation of the lift arm (4). The second sensor (S ₂ ) detects the position immediately before the container (Ct) is loaded into the container and the operation of the driving means (7) is slowly switched based on this detection signal, so that the container (Ct) is buffered. A cargo handling vehicle equipped with a detachable container, characterized in that it is installed on a cargo handling frame (1). 3. A lifting means (4) having a hook arm (5) capable of detachably connecting a container (Ct) to a cargo handling frame (1) mounted on a chassis (F). ), The dump arm (3) is provided so as to be tiltable backward in the front-rear direction, and the container (C) is provided by the single up-and-down rotation of the lift arm (4).
t) is loaded and unloaded between the cargo handling frame (1) and the ground (G), and the lift arm (4) and the dump arm (3) are integrally tilted so that the arms (4, 3) are moved.
In a cargo-handling vehicle provided with a detachable container configured to dump the container (Ct) mounted thereon, the lift arm (4) and the dump arm (3) are integrally lowered with the arms (4, 4). 3) containers that are mounted on the (Ct) is the position just before it is placed on a spreader (1) detected by the second sensor (S _2), slowly the actuation of said drive means based on the detection signal Switch
A cargo handling vehicle provided with a detachable container, wherein the container (Ct) is buffer-mounted on the cargo handling frame (1).