JPH0960033A - Backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a boom in a backhoe, which is designed so that it can be freely controlled remotely by means of an operating part that is separate from an operating lever on a turntable, to be operated to the rising side at proper speed by means of the operating part. SOLUTION: When the manual operating tool of an operating part 27 under remote operating conditions is operated to a position for raising a boom 4, operating oil for raising is quickly supplied to the hydraulic cylinder 11 of the boom 4 until a first predetermined amount of flow is reached, and is supplied step by step up to a second amount of flow greater than the first amount of flow. Thereafter, operating oil for raising is supplied whose second amount of flow is held constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe device for excavation work and a structure for remotely controlling a backhoe device and a swivel base.

[0002]

2. Description of the Related Art When excavating work with a backhoe in urban areas, demands for accuracy of excavation position have been increasing in recent years. This is because many pipes such as gas pipes, electricity, and telephones are buried in urban areas.Therefore, when performing excavation work in this area, it is necessary to perform excavation work without making buckets contact these pipes. Because there is.

Therefore, as disclosed in, for example, Japanese Unexamined Patent Publication No. 5-255948, an operation stick (see FIG. 3 of the above publication) is provided separately from the operation lever of the swivel base (9 and 10 in FIG. 1 of the above publication). 28, 29) (corresponding to an artificial operation tool) (2 in FIGS. 1 and 3 of the above publication)
7) is provided so that the operation can be switched between a normal working state in which the backhoe device and the swivel are operated by the operation lever of the swivel and a remote working state in which the backhoe device and the swivel are operated by the operation unit. is there. This allows
A worker standing by the backhoe has an operation part, and by switching to a remote work state, the worker having the operation part can position the bucket and a desired excavation position (for example, a position avoiding piping etc.) It is possible to accurately move the bucket to a desired excavation position by operating the operation unit while accurately grasping the relationship.

In this case, as in the normal working state by the operation lever of the swivel base, the backhoe device and the swivel base operate at a higher speed as the operating stick is operated from the neutral position in the remote working state. Cage,
The speed of the backhoe device and the swivel base can be arbitrarily adjusted depending on the operation position of the operation stick (see paragraph [0023] in the above publication).

[0005]

Since the operation lever of the swivel base has a relatively large operation stroke, the operation of arbitrarily adjusting the operating speeds of the backhoe device and the swivel base can be easily performed depending on the operation position of the operation lever. On the other hand, the operator has a small manual operation tool (operation stick) in the operation section, and the operation stroke is also small. Therefore, when the weight of the object to be moved is large, such as when raising and lowering the boom or turning the swing base,
The operation of operating the manual operation tool (operation stick) to a desired operation position within a small operation stroke and adjusting the speed of the boom and the swivel to an appropriate one is often difficult especially for an unskilled worker. SUMMARY OF THE INVENTION It is an object of the present invention to provide a backhoe configured to be remotely operated by an operation unit so that an operator unskilled in remote operation can operate the boom and the swivel base at an appropriate speed.

[0006]

[Means for Solving the Problems]

[I] According to the features of claims 1 and 3, when the manual operation tool of the operating portion is operated to the ascending side of the boom in the remote work state, the ascending side is moved by the flow rate control means (first flow rate control means). The hydraulic oil is maintained at a constant second flow rate, the hydraulic cylinder operates at a constant speed by the constant second flow rate regardless of the operation condition of the manual operation tool, and the boom operates at a constant low speed on the rising side. Go.

In this case, for example, as shown in FIG. 5, the flow rate of the hydraulic oil on the rising side is rapidly increased to the first flow rate (corresponding to A1), and from the first flow rate to the second flow rate (corresponding to A2). It is being operated gradually. As described above, the flow rate of the hydraulic oil on the rising side is first rapidly raised to the first flow rate, so that the starting force required to start raising the relatively heavy boom from the stopped state can be obtained. Then, the boom begins to rise without hindrance. Then, by gradually increasing the flow rate of the hydraulic oil on the ascending side from the first flow rate to the second flow rate, the boom reaches the above-mentioned constant speed with less shock after starting to rise.

[II] According to the features of claims 2 and 3,
When the manual operation tool of the operation unit is operated to the descending side of the boom in the remote operation state, the flow rate control means (second flow rate control means) maintains the hydraulic oil at a constant flow rate, and the operation condition of the manual operation tool is maintained. Regardless of, the hydraulic cylinder operates at a constant speed with a constant flow rate, and the boom moves downward at a constant speed.

Next, when the manual operation tool of the operation section is operated from the descending side to the neutral stop position, for example, as shown in FIG. 6, the flow rate of the hydraulic oil discharged from the hydraulic cylinder is the above-mentioned constant flow rate (A3). Corresponding to)) is gradually reduced. This causes the descending boom to stop with less shock.

[III] According to the feature of claim 4, as in the case of claim 1, 2 or 3, the above-mentioned [I] or [I]
I] described above, and in addition, the following “action” is provided. According to the feature of claim 4, when the manual operation tool of the operation section is operated to the swivel side of the swivel base in the remote work state, the swirl flow rate control means maintains the hydraulic oil at a constant fourth flow rate, and the artificial fluid is artificially operated. The hydraulic motor operates at a constant speed with the constant fourth flow rate regardless of the operating condition of the operating tool, and the swivel base swivels at a constant speed.

In this case, for example, as shown in FIG. 5, the flow rate of the hydraulic oil is rapidly increased to the third flow rate (corresponding to A1) and gradually increased from the third flow rate to the fourth flow rate (corresponding to A2). It is being lifted. As described above, the flow rate of the hydraulic oil is first rapidly increased to the third flow rate,
The starting force necessary for starting the turning of the relatively heavy swivel from the stopped state is obtained, and the swivel starts to turn without hindrance. Then, by gradually increasing the flow rate of the hydraulic oil from the third flow rate to the fourth flow rate, the swivel base reaches the above-mentioned constant low speed with less shock after starting to turn.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) FIG. 1 shows the entire side surface of a backhoe, in which a swivel base 2 is supported on an upper part of a rubber crawler type traveling device 1, and a backhoe device 3 is provided in front of the swivel base 2. The backhoe device 3 is provided with a boom 4 which is rocked up and down by a hydraulic cylinder 11, an arm 5 which is rocked back and forth by a hydraulic cylinder 12, and a bucket 6 which is rocked back and forth by a hydraulic cylinder 13. It is configured. The entire backhoe device 3 is the vertical axis P of the swivel base 2.
The backhoe device 3 is swingably supported around the backhoe device 3.
A hydraulic cylinder 7 for swinging the vehicle is provided, and a hydraulic motor 14 for driving the swivel base 2 is provided.

Next, a hydraulic circuit for the swivel base 2 and the backhoe device 3 will be described. As shown in FIG. 2, the hydraulic oil from the pump 26 driven by the engine 39 supplies and discharges the hydraulic oil to and from the control valve 21 and the hydraulic cylinder 12 of the arm 5 that controls the supply and discharge of hydraulic oil to and from the hydraulic cylinder 11 of the boom 4. It is supplied in parallel to a control valve 22 that operates and a control valve 23 that supplies and discharges hydraulic oil to and from the hydraulic cylinder 13 of the bucket 6. Control for supplying / discharging hydraulic oil from another pump 26 to / from the control valve 24 for supplying / discharging hydraulic oil to / from the hydraulic motor 14 of the swivel base 2 and hydraulic cylinder 7 for swinging operation of the backhoe device 3. It is supplied in parallel to the valve 25. Each of the control valves 21 to 25 is a pilot operated type, and by changing the pilot pressure, the opening degree of the control valves 21 to 25 is changed to adjust the flow rate of the hydraulic oil.
The operating speed of the hydraulic motors 1, 12, 13 and the hydraulic motor 14 is changed.

(2) As shown in FIGS. 1 and 2, the swivel base 2
In the driving unit 20, the right operation lever 9 (corresponding to an operation lever) and the left operation lever 10 (corresponding to an operation lever) are provided on the left and right of the driver's seat 8. The right and left operation levers 9 and 10 can be operated forward, backward, leftward and rightward.
Pair of pilot valves 15 that generate pilot pressure based on the operating position in the front-rear direction, and a pair of pilot valves 1 that generate pilot pressure based on the operating position in the left-right direction.
6 are provided, and a pair of pilot valves 17 that generate a pilot pressure based on an operation position of the left operation lever 10 in the front-rear direction and a pair of pilot valves 18 that generate a pilot pressure based on an operation position in the left-right direction are included. Has been.

From the pilot pump 36 driven by the engine 39, pilot hydraulic oil is supplied to each pilot valve 1
5 to 18 and the pilot pressure from the pilot valves 15 to 18 is applied to the pilot oil passages 41, 42, 43, 44.
Is supplied to the control valves 21 to 24 of the hydraulic cylinders 11, 12, 13 and the hydraulic motor 14 via the. Swivel 2
Is provided with an operation pedal (not shown), and a pair of pilot valves (not shown) that generate pilot pressure based on the left and right operation of the operation pedal are provided. It is supplied to the pilot valve for the operation pedal, and the pilot pressure from this pilot valve is supplied to the control valve 25 of the hydraulic cylinder 7 for rocking operation of the backhoe device 3 via the pilot oil passage 45.

With the above construction, when the right operation lever 9 is operated forward or backward, the control valve 21 is operated to the descending side or the ascending side of the boom 4, and when the right operating lever 9 is operated to the right or left, the control valve 23 is discharged to the earth side of the bucket 6. Or it is operated to the scraping side. When the left operation lever 10 is operated forward or backward, the control valve 22 is operated to the raising side or the scraping side of the arm 5, and when it is operated to the right or left, the control valve 24 is operated to the right side or the left side of the swivel base 2. . When the operation pedal (not shown) provided on the swivel base 2 is stepped to the left or right, the control valve 25 is operated to the right swing side and the left swing side of the backhoe device 3. In this case, since the pilot pressure is changed by the operating position of the right and left operating levers 9 and 10 (the operating amount from the neutral stop position), the operating amount from the neutral stopping position of the right and left operating levers 9 and 10 is changed. As it is larger, the control valves 21 to 24 are operated to the larger flow rate side, and the hydraulic cylinders 11, 12, 13 and the hydraulic motor 14 operate at high speed.

In a normal working state in which a worker seated on the driver's seat 8 of the swivel base 2 operates the backhoe, the lock lever 58, which will be described later, is switched to the operating position, and the switch valve 37 (corresponding to a switching means, described later) ) Is switched to the normal working position 37a. In the normal working state, as described above, the pilot pressure is generated in proportion to the operation amounts of the right and left operation levers 9 and 10 of the operating unit 20 and the operation pedal, and the control valves 21 to 25 are operated. In this case, the upper limit of the pilot pressure is determined by the relief valve 49 of the oil passage 19,
The speed corresponding to the upper limit of the pilot pressure is the maximum operating speed of the backhoe device 3 and the swivel base 2.

(3) In this backhoe, the backhoe device 3 and the swivel base 2 are provided with an operation box 27 (corresponding to an operation section).
Thus, a configuration for remotely operating from the outside of the driving unit 20 is provided. Next, the configuration for this remote operation will be described. As shown in FIG. 2, apart from the pilot valves 15 to 18, five pairs of auxiliary pilot valves 31, 3 of the electromagnetic proportional pressure control valve type are provided.
2, 33, 34 and 35 are provided on the swivel base 2.
The oil passage 19 from the pilot pump 36 is provided with a switching valve 37, and the oil passage 4 from the switching valve 37 to the pilot valves 15 to 18 is provided.
6 and an oil passage 47 to the auxiliary pilot valves 31 to 35 are provided, and the auxiliary pilot valves 31 to 35 are provided in the oil passage 47.
Are connected in parallel.

The switching valve 37 is of an electromagnetically operated type, and has a normal working position 37a for supplying pilot working oil to the oil passage 46 on the pilot valve 15-18 side, and auxiliary pilot valves 31-35.
It is provided with three positions: a remote working position 37b for supplying pilot hydraulic oil to the oil passage 47 on the side, and an unload position 37c for discharging pilot hydraulic oil without supplying it to the oil passages 46, 47. For each pilot oil passage 41-45 between the pilot valves 15-18 and control valves 21-25, the auxiliary pilot oil passages 51, 5 from the auxiliary pilot valves 31-35 are provided.
2, 53, 54 and 55 are connected via a shuttle valve 48.

(4) The state shown in FIG. 1 is a state in which the operation box 27 is connected to the swivel base 2 via the cable 38. As shown in FIGS. 3 and 4, the operation box 27 includes a right operation stick 28 (corresponding to an artificial operation tool), a left operation stick 29 (corresponding to an artificial operation tool), and a left and right operation, which can be operated forward, backward, leftward and rightward. A switch 30, a changeover switch 40 for changing over the changeover valve 37 shown in FIG. 2, a pilot lamp 50, and an emergency stop switch 56 are provided.

With the above structure, in a remote working state using the operation box 27, a worker (not shown) beside the bucket 6 holds the operation box 27, and the changeover switch 40 of the operation box 27 is remote. Operate on the operating side.
As a result, the pilot lamp 50 of the operation box 27
2 is turned on, the switching valve 37 shown in FIG. 2 is switched to the remote work position 37b by the operation signal from the operation box 27, and the pilot hydraulic oil from the pilot pump 36 is transmitted through the oil passage 47 to the auxiliary pilot valves 31 to 35. Is supplied to.

Accordingly, when the right operation stick 28 of the operation box 27 is operated forward or backward, a constant operation current is sent to the auxiliary pilot valve 31 by the operation signal from the operation box 27 (second or third operation described later). Set value A
2, A3), the control valve 21 is operated by the constant auxiliary pilot pressure from the auxiliary pilot valve 31, and the boom 4 is operated to the descending side or the ascending side at a constant speed. When the right operation stick 28 is operated to the right or left, a constant operation current is sent to the auxiliary pilot valve 33 by the operation signal from the operation box 27, and the control valve 23 is operated by the constant auxiliary pilot pressure from the auxiliary pilot valve 33. The bucket 6 is operated and operates at a constant speed toward the soil discharge side or the scraping side.

Left operation stick 29 of operation box 27
Is operated forward or backward, a constant operation current is sent to the auxiliary pilot valve 32 by an operation signal from the operation box 27, the control valve 22 is operated by the constant auxiliary pilot pressure from the auxiliary pilot valve 32, and the arm 5 Operates at a constant speed on the raising side or the scraping side. When the left operation stick 29 is operated to the right or left, a constant operation current is sent to the auxiliary pilot valve 34 by an operation signal from the operation box 27 (a second set value A2 described later), and the constant operation from the auxiliary pilot valve 34 is performed. The control valve 24 is operated by the auxiliary pilot pressure of 1, and the swivel base 2 is operated to the right or left turning side at a constant speed.

Next, the operation switch 30 of the operation box 27
When the right and left are operated, a constant operation current is sent to the auxiliary pilot valve 35 by an operation signal from the operation box 27, the control valve 25 is operated by the constant auxiliary pilot pressure from the auxiliary pilot valve 35, and the backhoe device 3 is operated. Operates to the right swing side and the left swing side at a constant speed. The right and left operation sticks 28 and 29 and the operation switch 30 are of a neutral return type, and when the right and left operation sticks 28 and 29 and the operation switch 30 are released, they return to the neutral stop position and the auxiliary pilot valves 31 to 35. Also returned to the neutral position,
The control valves 21 to 25 return to the neutral position, and the backhoe device 3 and the swivel base 2 stop.

When the emergency stop switch 56 is pressed in the above remote operation state, the switching valve 37 is immediately switched to the unload position 37c, and the backhoe device 3 and the swivel base 2 are stopped. In some cases, when the emergency stop switch 56 is pushed in the remote work state, the engine 39 is stopped.

(5) When the right operation stick 28 is operated rearward (the rising side of the boom 4) and the left operation stick 29 is operated rightward or leftward in the remote operation state by the operation box 27 of the above item (4). (Right or left turning side of the swivel base 2), as shown in FIG. 5, the auxiliary pilot valve 31
(Upward side), the operating current to 34 is from zero to the first set value A
It is operated to ascend linearly to 1. As a result, the control valves 21 and 24 are rapidly opened from the neutral position to the opening degree corresponding to the first set value A1, and the control valve 21, 24 is opened to the oil chamber on the rising side in the hydraulic cylinder 11 of the boom 4 (the hydraulic motor 14 of the swivel base 2). ,
The hydraulic oil is rapidly supplied (corresponding to the first and third flow rates).

Next, the auxiliary pilot valves 31 (upward), 3
The operating current to 4 changes from the first set value A1 to the second set value A2.
Is gradually (upwardly convex quadratic curve) up to
The opening degree of the control valves 21, 24 gradually opens from the opening degree corresponding to the first set value A1 to the opening degree corresponding to the second set value A2, and the oil chamber on the rising side in the hydraulic cylinder 11 of the boom 4 is increased. The hydraulic oil is gradually supplied to (the hydraulic motor 14 of the swivel base 2) (from the first flow rate (third flow rate) to the second flow rate (fourth flow rate) larger than this). Equivalent to the state).

After that, the operating currents to the auxiliary pilot valves 31 (upward) and 34 are maintained at the second set value A2,
The opening degree of the control valves 21 and 24 is maintained at the opening degree corresponding to the second set value A2, and a constant flow rate is supplied to the ascending side oil chamber (the hydraulic motor 14 of the swivel base 2) in the hydraulic cylinder 11 of the boom 4. Hydraulic fluid is supplied (these are the flow control means, the first
Corresponding to the flow rate control means and swirl flow rate control means). Next, when the right operation stick 28 (left operation stick 29) is operated to the neutral stop position, the operation current to the auxiliary pilot valves 31 (upward side) and 34 is cut off, and the control valves 21 and 2 are cut off.
4 is rapidly moved to the neutral position, and the boom 4 (swivel base 2) is stopped.

(6) When the right operation stick 28 is operated forward (downward side of the boom 4) in the remote work state by the operation box 27 of the above item (4), the auxiliary pilot valve 31 (downward movement) as shown in FIG. The operating current to the side) is rapidly increased linearly from zero, then drawn upward in an arc-shaped curve to the third set value A3 and held at the third set value A3. It As a result, the control valve 21 is rapidly opened from the neutral position to the opening degree corresponding to the third set value A3, and the working oil is rapidly supplied to the descending side oil chamber in the hydraulic cylinder 11 of the boom 4, The hydraulic oil is supplied at a constant flow rate.

Next, when the right operation stick 28 is operated to the neutral stop position, the operation current to the auxiliary pilot valve 31 (downward side) gradually increases from the third set value A3 (a quadratic curve convex downward). When the descent operation is performed, the opening of the control valve 21 gradually closes from the opening corresponding to the third set value A3, and the hydraulic oil discharged from the oil chamber on the descending side in the hydraulic cylinder 11 of the boom 4 is It is gradually decreased by the control valve 21 (the above corresponds to the flow rate control means and the second flow rate control means).

When the set time T elapses, the operation current to the auxiliary pilot valve 31 (downward side) is cut off, the control valve 21 is rapidly operated to the neutral position, and the boom 4 is stopped. In this case, the operation box 27 is provided with an adjusting unit (not shown) that is capable of adjusting the set time T to be short or long.

(7) When the changeover switch 40 of the operation box 27 is operated to the normal operation side in the above remote operation state, if the lock lever 58 is changed over to the work position, an operation signal from the operation box 27 is generated. The switching valve 37 shown in FIG. 2 is switched to the normal working position 37a, and the pilot hydraulic oil from the pilot pump 36 is supplied to the pilot valves 15 to 18 via the oil passage 46. As a result, the right and left operation levers 9 of the operating unit 20 of the swivel base 2,
10. By operating the operation pedal, the backhoe device 3 and the swivel base 2 can be operated, and the normal excavation work can be performed as described above.

As shown in FIG. 2, a lock lever 58 is provided, and the lock lever 58 is switched to a stop position when a worker is getting on or off the operating unit 20 or when excavating work is temporarily interrupted. Therefore, even if an operator carelessly touches the right and left operation levers 9 and 10, the backhoe device 3 and the swivel base 2 do not start to operate unintentionally as described below. When the lock lever 58 is switched to the stop position in the normal work state where the selector switch 40 of the operation box 27 is operated to the normal operation side, the selector valve 37 is switched to the unload position 37c. Therefore, even if all the pilot hydraulic oil is discharged from the pilot pump 36 and the right and left operation levers 9 and 10 of the operating unit 20 and the right and left operation sticks 28 and 29 of the operation box 27 are operated, the backhoe device is operated. 3 and swivel base 2 are not operated.

On the contrary, even when the lock lever 58 is switched to the stop position and the switching valve 37 is switched to the unload position 37c, the changeover switch 40 of the operation box 27 is operated to the remote operation side to perform remote work. If it is in a state, the switching valve 3
7 is switched to the remote work position 37b, and the backhoe device 3 and the swivel base 2 can be remotely operated by the right and left operation sticks 28 and 29 of the operation box 27 and the operation switch 30. When the cable 38 of the operation box 27 is removed from the swivel base 2, the switching valve 37 is switched only by the lock lever 58, and if the locking lever 58 is switched to the stop position, the switching valve 37 is unloaded. When the switching lever 37 is switched to the position 37c and the lock lever 58 is switched to the operating position, the switching valve 37 is moved to the normal working position 3
It is switched to 7a.

[Other Embodiments of the Invention] The backhoe device by operating the arm 5 by operating the front and rear of the left operating stick 29, operating the bucket 6 by operating the right operating stick 28 left and right, and operating the left and right operating switches 30. Also in the rocking operation of 3, the operations described in the above (5) and (6) may be performed.

In the preceding paragraph (5) and FIG. 5, when gradually increasing the operating current to the auxiliary pilot valves 31 (upward), 34 from the first set value A1 to the second set value A2, As shown by the two types of two-dot chain lines, the characteristics of the raising operation may be arbitrarily changed. In the previous section (5), the first and second set values A1 and A2 are set to be the same in the raising operation of the boom 4 and the turning operation of the swivel base 2. The two set values A1 and A2 and the first and second set values A1 and A2 during the turning operation of the swivel base 2 may be set to different values.

In the above embodiment, the control valve 2
By operating the opening of 1, 24, (5)
Although it is configured to perform the operation described in (6), in addition to the control valves 21 and 24, a flow rate control valve dedicated to the remote operation state (flow rate control means, first and second flow rate control means, swirling flow rate control). (Corresponding to means) may be provided in each of the control valve 21 of the boom 4 and the control valve 25 of the swivel base 2 and configured to operate. In the above-described embodiment, the control valves 21 to 25 shown in FIG. 2 are electromagnetically operated, the pilot valves 15 to 18 and the auxiliary pilot valves 31 to 35 are eliminated, and the right and left operation levers are in a normal working state. 9, 1
0, control valves 21 to 25 depending on the operation signal from the operation pedal
Is operated, the right and left operation sticks 28 and 29 of the operation box 27, and the operation switch 30 in the remote work state.
The control valves 21 to 25 may be operated by an operation signal from the control valve.

[0038]

According to the first aspect of the present invention, in the backhoe configured such that the backhoe device can be remotely operated by the operating portion, the boom is moved to the rising side at a constant speed regardless of the operating condition of the manual operating tool in the operating portion. Since it operates, even a worker unskilled in remote work can properly operate the boom to the ascending side, and the operability of the backhoe can be improved. In this case, the flow rate of the hydraulic oil on the rising side is rapidly raised to the first flow rate, and is gradually raised from the first flow rate to the second flow rate. Starts to rise at a low speed from the stopped state without any trouble, and the speed gradually increases to reach the above-mentioned constant speed with less shock, and the shock at the start of operation on the ascending side of the boom is reduced, and the operability of the backhoe is reduced. Can be further improved.

According to the second aspect of the present invention, in the backhoe configured such that the backhoe device can be remotely operated by the operation section, the boom is moved downward at a constant speed regardless of the operation of the manual operation tool in the operation section. I will
Even a worker unskilled in remote work can operate the boom downward at an appropriate constant speed, improving the operability of the backhoe. In this case, since the hydraulic oil discharged from the hydraulic cylinder is configured to be gradually reduced, the relatively heavy boom stops with less shock, further improving the operability of the backhoe. be able to.

According to the third aspect of the present invention, in the backhoe in which the backhoe device can be remotely operated by the operating section, the boom is moved up and down at a constant speed regardless of the operating condition of the manual operation tool in the operating section. Therefore, even a worker unskilled in remote work can operate the boom up and down at an appropriate constant speed, and the operability of the backhoe can be improved.
In this case, the flow rate of the hydraulic oil on the rising side is rapidly raised to the first flow rate, and is gradually raised from the first flow rate to the second flow rate. Starts to rise from the stopped state without any hindrance and reaches the above-mentioned constant speed with less shock, so that the operability of the backhoe can be further improved. Since the hydraulic oil discharged from the hydraulic cylinder is configured to be gradually reduced, the relatively heavy boom will stop with less shock, further improving the operability of the backhoe. You can

According to the characteristics of claim 4, claim 1 or 2
Similarly to the case of 3 or 3, the above-mentioned "effect of the invention" of claim 1, 2 or 3 is provided. According to the feature of claim 4, irrespective of the operating condition of the manual operating tool in the operating section,
Since the turntable turns at a constant speed, even a worker unskilled in remote work can turn the turntable appropriately, and the operability of the backhoe can be further improved. In this case, since the flow rate of the hydraulic oil is rapidly increased to the third flow rate and gradually increased from the third flow rate to the fourth flow rate, the relatively heavy swivel base is stopped. Starting to turn at a low speed without any problem from the state, the speed will gradually increase and the above-mentioned constant speed will be reached with less shock, the impact at the start of turning on the turning base will be reduced, and the operability of the backhoe will be further improved. You can

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view of a backhoe equipped with an operation box for remote operation.

FIG. 2 is a hydraulic circuit diagram showing a linked state of pilot valves for the right and left operation levers, an auxiliary pilot valve for the operation box, a switching valve for pilot hydraulic oil, each control valve, etc.

[Fig. 3] Front view of the entire operation box

FIG. 4 is an overall plan view of an operation box

FIG. 5 is a diagram showing a relationship between a post-operation of the right operation stick (right or left operation of the left operation stick) in the operation box and an operation current to the auxiliary pilot valve.

FIG. 6 is a diagram showing the relationship between the front operation of the right operation stick in the operation box and the operation current to the auxiliary pilot valve.

[Explanation of symbols]

 2 swivel base 3 backhoe device 4 boom 9 and 10 operating lever 11 and 12 and 13 hydraulic cylinder 14 hydraulic motors 21, 22, 23 and 24 control valve 27 operating unit 28 and 29 human operating tool for operating unit 37 switching means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Iitani 1-9-1 Higashikagaya, Suminoe-ku, Osaka-shi, Osaka

Claims (4)

[Claims] 1. A hydraulic motor (14) for driving a swivel base (2) to swivel, and hydraulic cylinders (11), (12), (13) for driving a backhoe device (3). 14) and hydraulic cylinders (11), (12),
A control valve (21) for supplying and discharging hydraulic oil to (13),
(22), (23), (24) and the control valve (2
(1), (22), (23), (24) is a backhoe provided with the operation levers (9), (10) that can be operated freely, and the swivel base (2). An operation tool (28), (29) is provided, and the control valve (21), (22), (23), (24) can be remotely operated by operating the artificial operation tool (28), (29). The control valve (21), (2) by the part (27) and the operating levers (9), (10).
2), (23) and (24) are operated normally,
And the control valve (21) by the operation unit (27),
(22), (23) and (24) are operated, and a switching means (37) capable of switching operation to a remote work state is provided, and an artificial operation tool (28) of the operation section (27) in the remote work state. ), (29) is operated to the ascending side of the boom (4), the hydraulic oil for ascending to the hydraulic cylinder (11) swingably driving the boom (4) reaches a predetermined first flow rate. Flow rate that is rapidly supplied until reaching the second flow rate, and is gradually supplied from the first flow rate to a second flow rate that is higher than the first flow rate, and thereafter, a hydraulic fluid for a constant increase of the second flow rate is supplied. A backhoe equipped with control means. 2. A hydraulic motor (14) for driving a swivel base (2) to rotate, and hydraulic cylinders (11), (12), (13) for driving a backhoe device (3), the hydraulic motor ( 14) and hydraulic cylinders (11), (12),
A control valve (21) for supplying and discharging hydraulic oil to (13),
(22), (23), (24) and the control valve (2
(1), (22), (23), (24) is a backhoe provided with the operation levers (9), (10) that can be operated freely, and the swivel base (2). An operation tool (28), (29) is provided, and the control valve (21), (22), (23), (24) can be remotely operated by operating the artificial operation tool (28), (29). The control valve (21), (2) by the part (27) and the operating levers (9), (10).
2), (23) and (24) are operated normally,
And the control valve (21) by the operation unit (27),
(22), (23) and (24) are operated, and a switching means (37) capable of switching operation to a remote work state is provided, and an artificial operation tool (28) of the operation section (27) in the remote work state. ), (29) is operated to the descending side of the boom (4), a constant flow rate of hydraulic oil is supplied to the hydraulic cylinder (11) that swings and drives the boom (4),
When the manual operation tools (28), (29) are operated to the neutral stop position, the flow rate of the hydraulic oil discharged from the hydraulic cylinder (11) that swings and drives the boom (4) gradually decreases. A backhoe equipped with a flow rate control means that allows the gas to be discharged while being discharged. 3. A hydraulic motor (14) for driving a swivel base (2) to rotate, and hydraulic cylinders (11), (12), (13) for driving a backhoe device (3), the hydraulic motor ( 14) and hydraulic cylinders (11), (12),
A control valve (21) for supplying and discharging hydraulic oil to (13),
(22), (23), (24) and the control valve (2
(1), (22), (23), (24) is a backhoe provided with the operation lever (9, (10) and the swivel base (2) capable of operating freely, and is an artificial operation that is artificially operated. An operating section provided with tools (28) and (29) and capable of remotely controlling the control valves (21), (22), (23) and (24) by operating the artificial operation tools (28) and (29). (27) and the control valves (21), (2) by the operation levers (9), (10).
2), (23) and (24) are operated normally,
And the control valve (21) by the operation unit (27),
(22), (23) and (24) are operated, and a switching means (37) capable of switching operation to a remote work state is provided, and an artificial operation tool (28) of the operation section (27) in the remote work state. ), (29) is operated to the ascending side of the boom (4), the hydraulic oil for ascending to the hydraulic cylinder (11) swingably driving the boom (4) reaches a predetermined first flow rate. Is supplied rapidly until reaching a second flow rate higher than the first flow rate, and thereafter, a hydraulic fluid for a constant increase of the second flow rate is supplied. (1) When the flow rate control means and the manual operation tools (28) and (29) of the operation section (27) are operated to the descending side of the boom (4) in the remote work state, the boom (4) is rocked. For the driven hydraulic cylinder (11), a constant flow rate is created. Oil is supplied,
When the manual operation tools (28), (29) are operated to the neutral stop position, the flow rate of the hydraulic oil discharged from the hydraulic cylinder (11) that swings and drives the boom (4) gradually decreases. A backhoe provided with a second flow rate control means for discharging the gas. 4. The hydraulic motor (1) when the manual operation tools (28), (29) of the operation section (27) are operated to the revolving side of the revolving base (2) in the remote working state.
4) The hydraulic oil is rapidly supplied until it reaches a predetermined third flow rate, and is gradually supplied from the third flow rate to a fourth flow rate higher than this, and thereafter, the fourth flow rate is kept constant. The backhoe according to any one of claims 1, 2 and 3, further comprising swirling flow rate control means for supplying the hydraulic oil of claim 1.