JPH027069Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a control device for a dump truck.

(Prior art) Conventionally, the control lever of a dump truck is generally installed in the cab near the driver's seat. There is a problem that the items may be damaged.

Further, if the user forgets to turn off the operating switch of the power take-off device after operation, the hydraulic pump continues to operate via the power take-off device, causing the hydraulic pump to seize up.

(Example) The present invention will be explained below based on the drawings.
In the figure, a box 1 is disposed near a driver's seat (not shown), and the box is divided by a partition wall 4 into upper and lower chambers 1a and 1b.

The upper chamber 1a of the box 1 is provided with a lid 2 that can be opened and closed about a hinge 3.
A lock member 6 is provided at the upper part of the other side wall opposite to the side wall to which the hinge 3 is attached.

On the other hand, a lock piece 5 that can be engaged with the lock member 6 is attached to the back surface of the end of the lid body 2.
When the lid 3 is closed, the locking piece 5 and the locking member 6 engage to lock the lid 2 in the closed position.

Inside the box 1, an operating lever 7 for tilting a dump truck cargo box (not shown) and an operating switch 8 for a power extraction device 10 for extracting engine power are installed in the main body upper chamber 1a, respectively.

Of these, the operating lever 7 for tilting the cargo box can be swung between a neutral position (a) in an upright state, a raised position (b), and a lowered position (c), and the operating switch 8 for the power extraction device is in a position where the power extraction device 10 is turned off. (the solid line position in FIG. 2) and the position where the power take-off device 10 is in contact (the chain line position in FIG. 2).

Further, a stopper 9 made of an elastic body is fixed to the back surface of the lid body 2 at a position facing the operation switch 8.
When the lid body 2 is in the closed position, the stopper 9 forces the operation switch 8 to the lowered position in which the power take-off device is turned off.

Figure 3 shows the hydraulic system of a dump truck.
A hydraulic pump 11 is connected to the power extraction device 10 via a transmission shaft 12 . 13 is a solenoid switching valve,
The oil discharged from the hydraulic pump 11 is guided to the hydraulic cylinder 14 to tilt or lay down the cargo box.

Next, the operation of the device of the present invention will be explained. It is assumed that the cargo box tilting operation lever 7 is now in the neutral position A, and the power take-off device operation switch 8 is in the off position. To tilt the cargo box from this state,
First, the lid 2 is opened as shown by the chain line in FIG. 1, and then the operation switch 8 is pulled up and switched to the closed position.

As a result, the air cylinder is actuated by a solenoid valve (not shown) and the power take-off device is actuated, so that the engine power is transferred to the transmission shaft 1 of the power take-off device 10.
2 to the hydraulic pump 11, and drives the hydraulic pump 11.

Next, when the cargo box tilting operation lever 7 is switched to the raised position B, the electromagnetic switching valve 13 is moved to the raised position (right position).
The oil discharged from the hydraulic pump 11 flows into the hydraulic cylinder 14 via the electromagnetic switching valve 13.
As a result of extending the hydraulic cylinder 14, the cargo box is tilted. In this case, the operating lever 7 automatically returns to the neutral position, and is operated only when it is swinging and biased to the raised position (B) or the lowered position (C).

When the load discharge operation is completed and the operating lever 7 is switched to the down position C, the electromagnetic switching valve 13 is also switched to the down position (left position), and the cargo box is laid down in the running position. When the work is completed, the operation switch 8 is pushed in, and the hydraulic pump 11 stops driving.

After that, all you have to do is close the lid 2, and even if you forget to turn off the operating switch 8, the stopper 9 on the lid 2 will force the operating switch 8 to the OFF position, so the hydraulic pump 11 can be reliably stopped.

(Effects of the invention) As described above, the present invention can protect the control device by housing the operating lever for tilting the cargo box and the operating switch for power extraction inside the box, and also provides a stopper on the back of the lid. By providing this, the power take-off device can be reliably turned off while the vehicle is running.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of the operating lever and operating switch in the box, FIG. 2 is a partially sectional side view of FIG. 1, and FIG. 3 is a hydraulic system diagram of the dump truck. 1...Box, 2...Lid, 7...Operation lever, 8...Operation switch, 9...Stopper, 10
...Power take-off device.

Claims (1)

[Scope of utility model registration request] In a control device for a dump truck that performs a tilting operation of a cargo box and a connection/disconnection operation of a power extraction device, the control device is installed in an operation box having a lid that can be opened and closed, and when the lid closes the operation box, the power output is 1. A control device for a dump truck, characterized in that a stopper is provided on the back surface of the lid body facing the operation switch so that the operation switch of the take-out device is in the off position.