JPH0324679Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a load spill prevention device for a loading vehicle.

As shown in Fig. 1, the loading vehicle is one in which a boom 2 is attached to a car body 1 so that it can move up and down with a boom cylinder 3, and a bucket 4 is connected to the boom 2 with a bucket cylinder 5 so that it can tilt forward and backward. It has been known.

In such a loading vehicle, a load such as earth and sand is scooped into the bucket 4 in the state shown in FIG. Load the cargo into.

As shown in Fig. 2, when traveling with the bucket 4 rotated upward, acceleration F ₁ and gravitational acceleration F ₂ act on the loaded object A as seen from the vehicle body, and the resultant acceleration F ₃ acts on the loaded object A. Load A may spill onto the vehicle body 1 side.

In other words, as the vehicle speed increases, the backward acceleration F ₁ seen from the vehicle body increases, so the direction of the resultant acceleration F ₃ also becomes backward, causing the load A in the bucket 4 to fall.

For this reason, there is a problem that the loading work efficiency of the loaded object A deteriorates.

The present invention was developed in view of the above circumstances, and its purpose is to provide a cargo spill prevention device for loading vehicles that controls the inclination of the bucket to maximize loading efficiency depending on the direction of acceleration. It is to be.

An embodiment of the present invention will be described below with reference to FIG.

The bucket 4 is provided with an acceleration direction sensor 6 that detects the direction of the resultant acceleration F 3 of the gravitational acceleration F ₂ and the vehicle running acceleration F ₁ (acceleration seen from the vehicle body) that actually acts on the bucket ₄ . .

The bucket cylinder 5 is supplied with the discharge pressure oil of the pump P by a bucket valve 7, and the bucket valve 7 has three positions: a neutral position N, a forward tilt position that supplies discharge pressure oil to the forward tilt chamber 5a, and a backward tilt chamber 5b. The first and second solenoids 7 ₁ , 7 ₂ are provided with a backward tilted position to supply discharge pressure oil to the
When energized, it is switched to the forward tilted position and the backward tilted position.

The solenoids 7 ₁ and 7 ₂ are excited and controlled by a control mechanism 8 .

The control mechanism 8 includes a manual control section 8a and an automatic control section 8b, and the manual control section 8a receives forward tilt and backward tilt signals R ₁ and R ₂ from the bucket lever 9 and controls the first and second solenoids 7 _{1 .} , 7 ₂ , and the automatic control unit 8b compares the resultant acceleration direction from the acceleration direction sensor 6 with a preset acceleration direction in which the loading efficiency is highest,
An excitation signal is output to the first and second solenoids 7 ₁ and 7 ₂ so that the detected resultant acceleration direction matches the set acceleration direction, and the manual control section 8a is given priority over the automatic control section 8b. It's summery.

Note that when the detected resultant force acceleration direction is smaller than the maximum value or smaller than the minimum value, it is determined that the loading state is not established and the automatic control section 8b does not operate.

As described above, the cargo A is placed in the bucket 4.
When the car body 1 is running with a load of cargo loaded, the bucket cart 4 is controlled to tilt forward and backward so that the direction of the resultant acceleration acting on the bucket cart 4 matches the set acceleration direction. can be transported and loaded, improving work efficiency.

The present invention is as described above, and it is possible to travel without spilling cargo from the bucket 4, thereby improving work efficiency.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional example, and FIG. 3 is an explanatory diagram showing an embodiment of the main part of the present invention. 1 is a vehicle body, 2 is a boom, 4 is a bucket, 5 is a bucket cylinder, 6 is an acceleration direction sensor, 7 is a bucket valve, and 8 is a control mechanism.

Claims (1)

[Scope of utility model registration request] In a loading vehicle, a boom 2 is pivotally attached to a vehicle body 1 so as to be vertically movable, and a bucket 4 is connected to the boom 2 by a bucket cylinder 5 so as to be tiltable forward and backward. The supply of discharge pressure oil is controlled by a bucket valve 7, and the bucket 4 is provided with an acceleration direction sensor 6 that detects the direction of the resultant force acceleration, and the detected acceleration direction and a preset acceleration direction with the highest loading efficiency are connected. A cargo spill prevention device for a loading vehicle, characterized in that a control mechanism 8 is provided for comparing the values and outputting a switching signal to a bucket valve 7 so that the two match.