JPS6329657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a container loading/unloading control device for a cargo handling vehicle, which enables a container on the chassis of a cargo handling vehicle to be tilted, and also allows the container to be loaded and unloaded between the chassis and the ground. It is related to.

In conventional container loading/unloading control systems, manual switching valves are connected to the lift cylinders, lock cylinders, etc. that allow containers to be tilted or loaded/unloaded. It was necessary to sequentially switch these manual switching valves, and the operation was extremely complicated.

The present invention has been made in view of the above, and provides a container loading/unloading control device for a cargo handling vehicle that allows tilting and loading/unloading of a container to be carried out safely, reliably, and with simple operations.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. V is a cargo handling vehicle, and a tilting frame 2 is provided at the rear of the chassis 1, and an L-shaped cargo handling frame 3 is provided at the front thereof. The container C can be placed on these frames 2 and 3. The tilting frame 2 is a chassis 1
The rear end is pivoted 4 to the rear end of the chassis 1 so that it can be tilted relative to the tilting frame 2, and the L-shaped cargo handling frame 3 can be slid back and forth with respect to the tilting frame 2.

That is, on the inner surface of the front part of the tilting frame 2, guide members 5, 5 each having a U-shaped cross section are fixed to face each other. A crescent-shaped receiving member 6 fixed to the rear end is slidably fitted.

On the other hand, the tip of a lift cylinder 7 whose base end is pivotally supported on the chassis 1 is connected to the center of the L-shaped cargo handling frame 3, and the expansion and contraction of the lift cylinder 7 causes the L-shaped cargo handling frame to 3 can be slid back and forth along the guide member 5 of the tilting frame 2.

A horizontal shaft 8 is rotatably supported in the middle of the tilting frame 2, and an arm 10 having a locking piece 9 fixed to its tip is fixed to the horizontal shaft 8.

The other end of a connecting rod 11, one end of which is connected to the tip of this arm 10, is connected to one end of a triangular link 12 that is pivotally supported by the tilting frame 2. 2
The lock cylinder 13 is pivotally supported at the tip of the lock cylinder 13.

Therefore, by expanding and contracting the lock cylinder 13, the arm 10 can be swung up and down via the triangular link 12 and the connecting rod 11.

That is, when the arm 10 is held horizontally (in the upper limit position) by contracting the lock cylinder 13 and then the lift cylinder 7 is extended, the receiving member 6 comes into contact with the locking piece 9 of the arm 10. , as shown in FIG. 2, the tilting frame 2 and the cargo handling frame 3 are tilted together, and the container C
can be tilted.

Further, by extending the lock cylinder 13, the arm 10 is held at the lower limit position, and when the lift cylinder 7 is extended in this state, the receiving member 6 at the rear end of the cargo handling frame 3 is moved until it contacts the pivot shaft 8. The cargo handling frame 3 is slid along the guide member 5 of the tilting frame 2, and then, as shown in FIG. can. In this case, although not shown, the pivot shaft 8 is provided with means to prevent the receiving member 6 from detaching.

Note that 19 is a roller fixed to the four pivot shafts, which slides on the floor surface of the container C.

Next, to explain the hydraulic circuit with reference to FIG. 4, electromagnetic control valves V1 and V2 are connected in parallel to the discharge port of the pump P, and an oil reservoir is connected to the suction port of the pump P and the electromagnetic control valves V1 and V2. T is connected.

And the solenoid control valve V1 is the solenoid SOL1,
Furthermore, the electromagnetic control valve V2 is provided with solenoids SOL3 and SOL4.

The piston back pressure side oil chamber and the piston rod side oil chamber of the lift cylinder 7 are connected to an electromagnetic control valve V1, and a counterbalance valve 14 is also connected between these oil chambers.

On the other hand, the piston back pressure side oil chamber and the piston rod side oil chamber of the lock cylinder 13 are connected to the electromagnetic control valve V2.

15 is a relief valve connected between the pump P and the oil reservoir T.

Next, an electric circuit diagram as a control device for switching and controlling the electromagnetic control valves V1 and V2 will be explained with reference to FIG. 5. BT is a power source such as a battery,
SW1 is a power switch, SW2 is a switch operated by a first operating lever 17 of a control panel 16 shown in FIG. 6, and SW3 is a switch operated by a similar second operating lever 18.

LS1 and LS2 are electrical contacts that operate at the upper limit position and lower limit position of the arm 10, and the triangular link 1
Tilt frame 2 to be switched via 2
is installed on.

Further, LS3 is an electric contact for detecting the return state of the tilting frame 2, and is mounted at an appropriate position on the chassis 1.

R1, R2, R3, R4, R5, and R6 are electromagnetic relays (hereinafter referred to as relays), and have contacts r1, r2, r3, r4, r5, and r6, respectively.

Next, to explain the operation of this embodiment, the electric circuit diagram configuring the control device shown in FIG. 5 shows the arm 10 at the upper limit position, and the electric contact LS1 is at the upper limit position. opened,
Electrical contact LS2 is located at the lower position and closed, and electrical contact LS3 is located at the lower position and closed.

Here, when tilting the container C, first switch the power switch SW1 to the close side, and then operate the first operating rod 17 to the "up" side to turn the switch SW1.
2 to the upper position.

Then, the current from the power supply BT flows through the power switch.
Relay R1 is energized via SW1 and switch SW2, and its a contact r1 is closed.

Here, since the arm 10 is at the upper limit position and the electrical contact LS2 is closed as described above, the electrical contact LS2 and the relay contact r
1, the relay R3 is excited and its contacts are switched.

As a result, the solenoid
Since SOL1 is excited, the solenoid control valve V1 is switched to the right position.

Then, the pressure oil from the pump P flows into the piston back pressure side hydraulic pressure of the lift cylinder 7, and when the counter balance valve 14 opens upon receiving back pressure above a certain level, the piston rod side oil chamber of the lift cylinder 7 communicates with the oil reservoir T. Therefore, lift cylinder 7
starts to expand.

Therefore, the cargo handling frame 3 is the tilting frame 2.
The container C is tilted around the four pivot parts together with the container C.

Incidentally, in order to tilt the container C in a tilted state, the first operating rod 17 is operated to the "down" side to switch the switch SW2 to the downward position.

Then, as a result of energizing relay R2, the current flows to solenoid SOL2 via its a contact r2.

Solenoid control valve V is activated by energizing solenoid SOL2.
1 is switched to the left position, and the pressure oil flows into the piston rod side oil chamber of the lift cylinder 7, contrary to the above, and causes the lift cylinder 7 to contract.

Therefore, the cargo handling frame 3 is integrated with the tilting frame 2 and lies down around the pivot portion 4, and the container C
can return to the running position.

At this time, when the arm 10 is at the lower limit position, the electric contact LS1 is closed, so if the first operating rod 17 is operated to the "up" side,
At the same time as relay R1 is energized, electrical contact LS1
energizes relay R6 via.

Then, the solenoids SOL2 and SOL3 are energized via the a contact r1 and the b contact r3, and the solenoid control valve V
As a result of switching the solenoid control valve V1 to the left position and the solenoid control valve V2 to the right position, the pressure oil is transferred to the lift cylinder 7.
At the same time, the oil is supplied to the piston rod side oil chamber.
The oil is supplied to the piston rod side oil chamber of the lock cylinder 13.

By the way, since the lift cylinder 7 is in the contracted position, it will not be contracted any further, and only the lock cylinder 13 will be contracted.

Therefore, the arm 10 is rotated upward about the horizontal axis 8 via the triangular link 12 and the connecting rod 11 to open the electric contact LS1, and then reach the upper limit position and close the electric contact LS2.

When the electric contact LS2 is closed in conjunction with the excitation of the relay R1 by the switch SW2, the relay R3 is energized, and as a result, its b contact is opened and the energization to the solenoids SOL2 and SOL3 is cut off, and at the same time Flows to solenoid SO1 via contact r3. After this, as described above, the lift cylinder 7 is extended and the container C is tilted.

Next, to explain the case of loading and unloading container C, after operating the power switch SW1, operate the second operating lever 18 to the "wholesale" side and turn on the switch SW1.
3 to the upper position.

Then, as described above, the arm 10 is at the upper limit position and the electrical contacts LS2 and LS3 are closed.
Since electrical contact LS1 is open, current first energizes relay R4, and as a result of switching its a contact r4, it flows through relay contacts r4 and r6 to solenoid SOL2, and at the same time flows through relay contacts r4 and r6. and flows to solenoid SOL4.

Therefore, by switching the electromagnetic control valves V1 and V2 to the left position, pressure oil is supplied to the piston rod side oil chamber of the lift cylinder 7, and at the same time, is supplied to the piston back pressure side oil chamber of the lock cylinder 13.

By the way, since the lift cylinder 7 is in the contracted position, it will not contract any further, and only the lock cylinder 13 will start to extend.

Therefore, the arm 10 is rotated downward about the horizontal axis 8 via the triangular link 12 and the connecting rod 11.

When the arm 10 starts to rotate downward, the triangular link 12 separates from the electric contact LS2, and when the arm 10 further rotates to the lower limit position, the electric contact LS2 is disconnected.
Switch LS1 to the closed position.

As a result, relay R6 is energized, so b
Contact r6 is opened to cut off the current to solenoid SOL4, and energize solenoid SOL1 via electric contact LS3 and a contacts r6 and r4.

Therefore, the electromagnetic control valve V1 is switched to the right position and the lift cylinder 7 is extended.

The extension of the lift cylinder 7 causes the cargo handling frame 3 to slide rearward and then stand up about the pivot 8, so that the container C can be unloaded onto the ground.

On the other hand, when loading the container C onto the cargo handling frame 3, by operating the second operating rod 18 to the "load" side and switching the switch SW3 to the downward position, the current will energize the relay R5 and the electrical contact LS3. , a contact r
6, flows to solenoid SOL2 via r5.
As a result, the electromagnetic control valve V1 is switched to the left position, the lift cylinder 7 is contracted, and the cargo handling frame 3 is
Since container C is rotated around axis 8,
is pulled up onto the tilting frame 2 and cargo handling frame 3, and the cargo handling frame 3 is further slid from the tilting frame 2 to return to the running state shown in FIG.

At this time, since the electric contact LS1 is closed when the arm 10 is at the lower limit position, when the second operating rod 18 is operated to the "whole" side, the electric contact LS1 is connected to the relay R4 and the electric contact LS1. Since relay R6 is energized, solenoid SOL1 is immediately energized.

Therefore, by switching the electromagnetic control valve V1 to the right position and extending the lift cylinder 7,
After sliding the cargo handling frame 3 backward, it is raised up about the pivot 8, and the container C can be unloaded onto the ground.

In addition, when electrical contact LS3 is open,
Specifically, when a pull-out load or the like acts on the cargo handling frame 3 and the tilting frame 2 rotates around the four pivots and floats up, the flow will not flow to the solenoids SOL1 and SOL2 via the electrical contact LS3. do not have.
This can be done by operating the second operating lever 18 and turning the switch.
This means that loading and unloading of Container C will not be possible even if SW3 is inserted into either of them, and this is to prevent a large load from acting on the frame.

As described above, according to the present invention, by appropriately operating the first operating lever and the second operating lever, the arm is automatically operated in response to the operation, and then the cargo handling frame is tilted or raised. This eliminates the need for complicated operations, reliably prevents erroneous operations, and allows containers to be tilted or loaded and unloaded safely.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention.
The figure is a diagram of the running state of the cargo handling vehicle, Figure 2 is a diagram of the container tilting state of the cargo handling vehicle, Figure 3 is a diagram of the container loading and unloading state of the cargo handling vehicle, and Figure 4 is a hydraulic circuit diagram of the cargo handling vehicle.
FIG. 5 is an electric circuit diagram configuring the control device of the cargo handling vehicle, and FIG. 6 is a plan view showing the control panel of the cargo handling vehicle. DESCRIPTION OF SYMBOLS 1... Vehicle chassis, 3... Cargo handling frame, 7... Lift cylinder, 16... Control panel, 17... First operating lever, 18... Second operating lever.

Claims (1)

[Claims] 1. A cargo handling frame on which a container, etc. can be placed is mounted on the vehicle platform via an arm so that it can be tilted or raised, a lift cylinder is connected between the cargo handling frame and the vehicle chassis, and the arm is moved to the tilted position of the cargo handling frame. A cargo handling vehicle is provided with a lock cylinder that selects a lifting position and a lock cylinder, and the cargo handling frame can be tilted or raised by the lift cylinder and the lock cylinder, a first electromagnetic control valve for controlling the lift cylinder, and a first electromagnetic control valve for controlling the lift cylinder; A second electromagnetic control valve for controlling the arm is provided in parallel, and a control device for switching and controlling these electromagnetic control valves is provided. A switch is provided that is switched and controlled in conjunction with the operation of first and second operating rods for selecting tilting or elevation of the cargo handling frame, the first operating rod is used to tilt the cargo handling frame, and the second operating rod is used to perform cargo handling. A container loading/unloading control device for a cargo handling vehicle, characterized in that the lift cylinder and the lock cylinder are appropriately expanded and contracted so as to raise and lower the frame.