JPS5921065Y2 - dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dump truck equipped with a dump platform configured to be able to perform dumping operations by operating a hydraulic drive device.

In order to perform dumping operations safely on slopes where the discharge side of the dump platform is directed downward, the angle of inclination of the vehicle body at that time must be based on the absolute angle of the platform to the ground that would cause the vehicle to overturn, and the maximum dump angle of the platform. The condition is that the vehicle tilt angle is within the range of the set tilt angle, but it is extremely difficult to intuitively determine that the vehicle tilt angle is within the allowable set angle range, or the vehicle is equipped with a vehicle tilt display mechanism. Even so, it was easy to get distracted by the dump truck operation and forget to check the slope, and there was a great risk of the vehicle tipping over.

The technical problem that this invention aims to solve is to safely carry out dump operations on slopes. It is in the point of doing.

The technical measures taken to solve the above technical problems are:
In a dump vehicle equipped with a dump bed configured to freely operate the dump by the operation of a hydraulic drive device, in an operating mechanism for operating a control valve of the hydraulic drive device, a control valve is connected to the lift side of the dump bed. In addition to incorporating a restraining device that prevents switching, the restraining device is placed in a position where the vehicle is tilted at an angle greater than or equal to a set angle with the discharge side of the dump bed facing down, and when the vehicle body is tilted less than the set angle. The structure is such that the posture can be changed freely to a posture in which the restraining force is released.

The above technical means works as follows.

In other words, the control valve is operated so that the control valve can freely switch the posture of the restraint device between a posture in which the vehicle body is tilted by an angle greater than or equal to the set angle of the dump platform, and a posture in which the vehicle body tilts less than the set angle. Because of this structure, if the vehicle body is tilted beyond the set angle of the dump bed, dumping operation will not be possible even if an attempt is made to operate the operating mechanism, and if the vehicle body tilt is less than the set angle, the dumping operation can be performed freely up to the maximum dump angle.

As a result of the above, the present invention has the following effects.

In other words, if the vehicle tilts beyond the allowable set angle, it will be impossible to dump the cargo platform, so when dumping on a slope, the vehicle can always be safely dumped without tipping over. I was able to do this.

In particular, since it is possible to sense that a slope is a dangerous work area even when the dump truck is inoperable, there is no need to worry about the slope condition when operating the dump truck, eliminating the pain caused by sensory operations for workers and giving them peace of mind. This has resulted in the special effect of being able to carry out dumping operations with great feeling.

Next, embodiments of the present invention will be described based on the drawings.

A cargo platform 4 is attached to a vehicle body 2 equipped with a crawler-type traveling device 1 so that it can be dumped freely around a horizontal horizontal axis P on the front end side of the vehicle body by a hydraulic cylinder 3, which is a hydraulic drive device. This is a dump truck equipped with an engine 6.

On a slope where the discharge side of the dump platform 4 is directed downward, if the inclination angle of the vehicle body 2 is greater than or equal to the allowable set angle θ that will cause the vehicle body 2 to overturn when the dump platform 4 is at the maximum dump angle. , the loading platform 4 in a non-dumping state cannot be dumped.

That is, in the loading platform dump operating mechanism A consisting of a control valve V for the loading platform driving cylinder 3 and its operating lever 7, the lever 7 for the valve V is provided to be swingable around an axis P1 parallel to the loading platform horizontal axis P. At the same time, a contact member 8 is connected to the lever 7, and a stopper 9 is provided on the vehicle body bracket 10, which is swingable around an axis P2 parallel to the axis P1 and hangs under its own weight. This stopper 9 and the abutting member 8 constitute a restraining device B that restrains the operation of the control valve (1).
When the vehicle body 2 is tilted beyond the set angle θ, the stopper 9 is swung to the operating position in contact with the abutting member 8 due to its own weight, and the lever 7 of the operating mechanism A is activated. The control valve (1) is configured to automatically prevent the operation of the dump platform 4 to the upward side, and the operating mechanism A itself is configured to be inoperable;
When the inclination of the vehicle body 2 is less than the set angle θ, a posture is created in which the stopper 9 does not come into contact with the abutting member 8 and the restraining action is released.

In this embodiment, the restraint tool B includes a stopper 9 and an abutting member 8.
This is the reason for this.

Note that when the vehicle body 2 is tilted beyond the set angle θ, the contact member 8
The abutting surface of the abutting member 8 against the stopper 9 is chamfered so that the abutting member 8 makes surface contact with the stopper 9, and another stopper 111 is attached to the bracket 10 to prevent the stopper 9 from swinging beyond the set angle θ. It is a provision.

In addition, a lever 7 that can freely swing around an axis perpendicular to the swing axis P2 of the stopper 9 is provided as the restraining device B, so that the stopper 9 moves when the vehicle body 2 is tilted by a set angle θ or more. so that it enters the movement path, and then move the lever 7.
Alternatively, the restraining device B may be constructed by providing the abutting member 8 on the vehicle body side and the stopper 9 on the dump operating mechanism side, or the vehicle body inclination can be detected electrically. In addition, the structure of the restraint tool B can be modified in various ways, such as by electrically operating the stopper 9 by a solenoid or the like and locking the operating mechanism A by interlocking the two.

Further, as a dump vehicle, a vehicle equipped with a wheel-type traveling device may be targeted.

[Brief explanation of the drawing]

The drawings show an embodiment of a dump truck according to the present invention, and FIG. 1 is an overall side view, and FIG. 3... Hydraulic drive device, 4... Dump loading platform, A... Operating mechanism, B... Bracing device,
■・・・Control valve, θ・・・Setting angle.

Claims (1)

[Scope of utility model registration request] In a dump vehicle equipped with a dump platform 4 that is configured to be able to perform dump operation by the operation of a hydraulic drive device 3,
A restraining device B that prevents switching of the control valve V to the upward side of the dump loading platform 4 is incorporated into the operating mechanism A that operates the control valve (1) of the hydraulic drive device 3, and this restraining device B is installed in the operating mechanism A that operates the control valve (1) of the hydraulic drive device 3. 4, with the release side facing down, and with the setting angle θ being in a position where the car body is tilted to create a tensioning position, and with the setting angle θ
A dump truck characterized in that the dump truck is configured such that the posture can be freely changed to a posture that releases the traction function when the vehicle body is tilted less than 30 degrees.