JPH10151981A - Vessel ascent travel preventing device for dump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vessel ascent travel preventing device that can prevent a deck over-tilting backward accident by carelessness or the like of an operator with certainty, and that it is less in a fear of trouble happening from the structural point of view. SOLUTION: A fact that a vessel went up is detected by a vessel ascent detecting sensor 21, receiving a signal of the sensor 21 with a control circuit 25, and when the vessel is goind upward, a lock actuator is operated, locking an accelerator pedal of a dump car to a nonoperativeness, and when the vessel is returned to its descent state, the operation is stopped, releasing the lock of the accelerator pedal, and thus the accelerator pedal is allowed to be trodden.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a vehicle from running up a dump truck, and more particularly to a device capable of surely preventing a so-called scallop accident.

[0002]

2. Description of the Related Art In a dump truck, a work is carried out in which a load such as earth and sand is loaded and transported on a vessel (loading bed), and the vessel is lifted and lowered at a target place, but the vessel is raised. If the dump truck is allowed to travel as it is, there is a concern that a so-called scallop accident, which collides with a building having a low vessel or an electric wire or various pipes, may occur.

On the other hand, a method of turning on a pilot lamp on an instrument panel or sounding a buzzer to warn of the rise of the vessel when the vessel rises has been adopted. The above-mentioned method is not a complete countermeasure against a siding accident, because it is caused by carelessness or getting used to the work.

Therefore, as shown in Japanese Patent Application Laid-Open No. 58-214424, when the dump truck travels a predetermined distance, for example, about 10 m, with the vessel raised, the supply of fuel is shut off to stop the engine and There has been proposed a vessel ascending traveling stop device in which a brake is locked in a braking state.

[0005]

By the way, in the case of road maintenance, the work of gradually lowering the ballast on the road surface while running the dump truck at a low speed with the vessel raised is performed. Dump trucks with a stop device cannot be used for such road maintenance work.

In order to lock the brake in the braking state, a method of controlling the hydraulic system of the brake is adopted. However, if a failure occurs in the vessel lifting traveling stop device for any reason, the normal traveling of the dump truck will occur. There is a concern that the brakes will be locked in the braking state even in the middle.

Further, since the dump truck can always travel a predetermined distance even when the vessel is raised, the engine is stopped and the brakes are locked while the vessel is caught in a building or the like due to a staking accident. If so, there is a problem that the dump truck cannot escape from the building or the like where the dump truck was caught.

[0008] In view of the above problems, the present invention can surely prevent a staking accident due to carelessness of an operator, and, if necessary, allow a dump vehicle to travel even with the vessel raised. It is another object of the present invention to provide a vehicle ascending traveling stop device for a dump truck that is less likely to cause a failure structurally.

[0009]

SUMMARY OF THE INVENTION In view of the above, the present invention relates to a device for stopping the ascent of a dump truck, which stops the traveling of the dump truck when the vessel is raised. A vehicle lift detection sensor that locks the accelerator pedal of the dump truck in a non-depressed state by operation
A lock actuator that releases the lock of the accelerator pedal by stopping the operation and permits the accelerator pedal to be depressed, and receives a signal from the vessel lift detection sensor to operate the lock actuator when the vessel rises, And a control circuit for stopping the operation of the lock actuator when is returned to the lowered state.

One of the features of the present invention is that the accelerator pedal is locked in a non-depressed state when the vessel is raised. As a result, it is possible to reliably prevent the dump truck from traveling with the vessel raised due to the carelessness of the driver or the like. However, when necessary, that is, when performing road maintenance, and when the vessel is caught in a building or the like for some reason, it is desirable that the dump truck can be run with the vessel raised, but it is simply a control circuit. ON / OFF of the control by only turns off the control circuit due to the driver's carelessness or familiarity
There is a possibility that the work may be performed in a state where it is kept as it is. Therefore, it is preferable to provide a push-button switch in the control circuit so that the operation of the lock actuator can be temporarily stopped as needed during operation.

The vessel elevation detection sensor may be any sensor as long as it can detect the elevation of the vessel, but if a proximity sensor is employed, malfunction may occur due to the body of the dump truck or various accessories. Therefore, it is preferable to use a mechanical switch, for example, a limit switch.

The lock actuator may be any mechanism as long as it can lock the accelerator pedal in a non-depressed state. For example, a hook is bent at the tip of a piston rod of an air cylinder or a hydraulic cylinder, and the hook is laid out so that it can be hooked on a rod of an accelerator pedal, that is, a rod that is attached to the accelerator pedal and transmits depression of the accelerator pedal, When the vessel descends, extend the piston rod to allow free depression of the accelerator pedal,
When the vessel rises, the piston rod may be contracted to lock the hook on the rod of the accelerator pedal to prevent the accelerator pedal from being depressed. In addition, air cylinders and hydraulic cylinders are placed beside the accelerator pedal,
The piston rod may be extended and inserted below the non-depressed accelerator pedal to lock the piston rod, and the piston rod may be contracted to release the lock. Furthermore, a wire may be connected to the rod of the accelerator pedal, and the motor may pull the wire to prevent the accelerator pedal from being depressed. In this case, any type of motor may be used as long as the rotation of the motor pulls the wire by a distance that causes the accelerator pedal to be in the non-depressed state, and the motor is reversed by a stop signal from the control circuit to loosen the wire.

[0013]

According to the present invention, when the vessel is raised, the accelerator pedal of the dump truck is locked in the non-depressed state by the lock actuator.
The dump truck cannot be run with the vessel raised, so that a so-called scooping accident can be reliably prevented.

Further, since the vessel lift prevention device is composed of a vessel lift detection sensor, a lock actuator and a control circuit, the structure of the device is simple and inexpensive, and all types of dump trucks and existing dump trucks can be used. It can be easily installed, and its maintenance is easy.

Further, since the accelerator pedal is locked, it is not necessary to provide a brake system, a fuel supply system, and a transmission system which are closely related to the traveling function of the dump truck. There is no possibility that a failure will occur and cause an obstacle to the normal running of the dump truck.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the drawings. FIGS. 1 to 3 show a preferred embodiment of a device for preventing a vehicle from climbing up and traveling of a dump truck according to the present invention. As shown in FIGS. 1 and 2, the dump truck 1
Reference numeral 0 denotes a vessel 12 provided behind the vehicle interior 11, a bracket 13 is provided at a rear end of the vessel 12, and the bracket 13 is rotatably attached to a rear end of the vehicle body frame 14.

A rear end of a hydraulic cylinder 15 is swingably mounted in the vicinity of the center of the vehicle body frame 14, and a front end of a piston rod of the hydraulic cylinder 15 is
When the piston rod is extended, the vessel 12 is pivoted around the bracket mounting portion, and is tilted and raised as shown in FIG. 2, whereby the piston rod is contracted. By doing so, the vessel 12 is swung in the opposite direction and descends to a horizontal state as shown in FIG.

The dump truck 10 is equipped with the vessel rising traveling prevention device 20 of the present embodiment. In the vessel rising prevention device 20, a limit switch 21 which is a vessel rising detection sensor is attached to a rear portion of the vehicle body frame 14, and the limit switch 21 has a beard at a sensing portion, and the vessel 12 has a predetermined inclination angle. It turns off when the angle is less than the angle, and turns on when the angle is more than the predetermined angle.

As shown in FIG. 3 (a), an accelerator pedal 16 is provided in front of the driver's seat in the passenger compartment 11, and one end of a rod 17 is provided on a side surface near the center of the accelerator pedal 16. The rod 17 is attached and extends to the fuel supply system through the front panel in the vehicle compartment, so that depression of the accelerator pedal 16 is transmitted to the fuel supply system.

One end of a wire 22 is connected to the rod 17 of the accelerator pedal 16, and the other end of the wire 22 is penetrated through the front panel of the vehicle interior, and the front panel of the vehicle interior is connected to the rod 17 of the wire 22. A coil spring 25 is compressed between the parts, and the wire 22 is urged by the coil spring 25 so that the wire 22 is loosened to the maximum depression position of the accelerator pedal 16.

The other end of the wire 22 is connected to a motor 23.
The motor 23 rotates by a predetermined number of revolutions, pulls the wire 22, holds the accelerator pedal 16 in the non-depressed position, reverses the predetermined number of revolutions to loosen the wire 22, and releases the accelerator pedal 16. The wire 22 and the motor 23 lock the accelerator pedal 16 of the dump truck 10 in a non-stepping state by its operation, and release the lock of the accelerator pedal 16 by stopping the operation. This constitutes a lock actuator that allows the accelerator pedal 16 to be depressed. Although the motor 23 and the pulley 24 are functionally shown in the description of the embodiment, specifically, the same function is achieved by using, for example, an engine stop motor (product name) manufactured by Nissan Diesel Co., Ltd. it can.

FIG. 3B shows a control circuit 26 for controlling the operation of the lock actuator. In the figure, a first relay 29 and a limit switch 21 as a vessel rise detection sensor are connected in series between a power supply 27 and a ground, and a power supply circuit 28 is configured. The switch 3 of the first relay 29 is connected between the power supply 27 side of the first relay 29 of the power supply circuit 28 and the ground.
0, second relay 31 and push-button switch 3
3 are connected in series to form a power supply control circuit 35.

The switch 32 of the second relay 31 of the power supply control circuit 35 has one contact connected to the power supply 27 side of the power supply circuit 28, and the switch 28 has two contacts a and b whose cut-off points are switched. And the two contacts a,
b is connected to the rotation-side connection terminal A and the reverse rotation-side connection terminal B of the motor 23, and the ground terminal of the motor 23 is connected to the ground.

Further, an alarm generating circuit 34 is connected between the second relay 32 of the power supply control circuit 35 and the switch 30 of the first relay 29. The alarm generation circuit 34 can be composed of a ROM storing alarm data such as "Dump is prohibited during driving" and a reproducing circuit for reproducing the alarm data as an alarm sound, but other audio data may be used. Alternatively, another circuit configuration may be adopted.

Next, the operation will be described. Dump truck 1
When the zero vessel 12 is in the horizontal state, the limit switch 21 is OFF, the motor 23 stops in a reverse rotation state, the wire 22 is unwound, and the accelerator pedal 16 can be freely depressed. ing.

When the vessel 12 is raised to a predetermined angle or more, the limit switch 21 is turned on, the power supply circuit 28 is closed, a current flows through the first relay 29, and the switch 30 is turned on. The supply control circuit 35 is closed, a current flows through the second relay 31, and the intercept switches to the terminal a.

Then, the alarm generating circuit 34 is energized, and the alarm "Dumping is prohibited during the dumping" is successively called to call attention to the driver, so that the driver does not step on the accelerator pedal 16 by mistake. .

At the same time, a current flows from the power supply 27 to the rotation-side terminal A of the motor 23, the motor 23 rotates to pull the wire 22, and the rod 17 of the accelerator pedal 16 is pulled to the non-depressed position and locked. The depression of the pedal 16 is prevented. Therefore, even if the driver depresses the accelerator pedal 16 due to carelessness or getting used to it, the driver cannot depress the accelerator pedal 16 and the dump truck 10 is prevented from running.

If the operator wants to drive the dump truck 10 with the vessel 12 raised as required, such as for road maintenance, while the accelerator pedal 16 is locked, the push button switch 33 is pressed. The switch 33
Is turned off, the power supply control circuit 35 is opened, the intercept of the second relay 31 is switched to the terminal b side, the motor 23 is reversely rotated, the wire 22 is loosened, and the accelerator pedal 16 is unlocked and freely released. Accelerator pedal 1
6, the dump truck 10
Can be run. When the hand is released from the push button type switch 33, the base switch 33 is turned on and the power supply control circuit 35 is closed again, so that the accelerator pedal 16 is locked.

On the other hand, when the vessel 12 of the dump truck 10 is lowered to a predetermined angle or less, the limit switch 21 is turned off.
FF, the power supply circuit 28 is opened, the power supply control circuit 35 is also opened, the section of the second relay 31 returns to the terminal b side, and the motor 23 reverses by a predetermined number of rotations to loosen the wire 22. ,Stop. Therefore, the accelerator pedal 16 can be freely depressed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a dump truck equipped with a vessel rising traveling prevention device according to the present invention.

FIG. 2 is a schematic diagram showing a state where the vessel of the dump truck is raised.

FIG. 3 is a diagram showing the vicinity of an accelerator pedal and a control circuit in a preferred embodiment of the above-described vessel rising traveling prevention device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Dump truck 12 Vessel 20 Vessel up traveling stop device 21 Limit switch (vessel up detection sensor) 22 Wire 23 Motor 24 Pulley 25 Control circuit 33 Push button type switch

Claims (3)

[Claims] 1. A vessel lifting travel stop device for stopping the traveling of a dump truck when the vessel rises, comprising: a vessel elevation detection sensor for detecting that the vessel has risen; While locking, the lock actuator that releases the lock of the accelerator pedal by stopping the operation and permits the accelerator pedal to be depressed, and receives a signal from the vessel lift detection sensor, and operates the lock actuator when the vessel rises. And a control circuit for stopping the operation of the lock actuator when the vessel returns to the down state. 2. The dump vehicle lift prevention device according to claim 1, wherein the control circuit includes a push button switch for temporarily stopping the operation of the lock actuator while the lock actuator is operating. 3. A wire connected to a rod attached to the accelerator pedal and transmitting the depression of the accelerator pedal, and a motor that pulls the wire to hold the accelerator pedal in a non-depressed state. The device for preventing the vehicle from running up in a dump truck according to claim 1, which is configured.