JPH045493U - - Google Patents

Description

[Brief explanation of the drawing]

1 and 6 are perspective views of an aerial work vehicle equipped with an overload prevention device according to the present invention, FIG. 2 is a hydraulic and electrical circuit diagram showing an example of the overload prevention device, and FIG. Figures 3B and 7 are block diagrams of the overload prevention device, Figure 4 is a sectional view showing the inside of the outrigger jack, and Figures 5A, 5B, and 8 are diagrams of the overload prevention device. Graph showing the relationship between regulatory load and overturning load when using
FIG. 9B is a graph showing the relationship between regulated load and overturning load when a conventional overload prevention device is used. 4,104... Boom, 51... Overhang amount detector, 10,101... Outrigger jack, 42,
142... Reaction force detector, 52, 152... Inclination detector.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The vehicle body is equipped with a boom that can be freely raised, extended and contracted, and rotated, and grounded on the front, back, left and right sides of the vehicle body with grounding plates that extend to the sides of the vehicle body and are attached to the lower end. In a boom work vehicle equipped with four outrigger jacks capable of supporting an a reaction force detector provided on each of the outrigger jacks to detect a grounding reaction force applied to each of the outrigger jacks when the ground plate is grounded; an overhang amount detector for detecting the extension; and a regulating means for regulating the operation of the boom when either of the ground reaction forces applied to the outrigger jacks detected by the reaction force detector exceeds a predetermined value. An overload prevention device for a boom work vehicle, wherein the predetermined value is set based on an overhang amount of the outrigger jack detected by the overhang amount detector. 2. The overload prevention device includes a tilt angle detector that detects the tilt angle of the vehicle body in a state where it is supported by the outrigger jack, and the predetermined value is detected by the overhang amount detector. The overload prevention device for a boom work vehicle according to claim 1, wherein the overload prevention device for a boom work vehicle is set based on the overhang amount of each of the outrigger jacks and the inclination angle of the vehicle body detected by the inclination angle detector. . 3. A boom operation that is equipped with a boom that can freely raise, extend, contract, and turn, as well as four outrigger jacks that can support the vehicle body by grounding the ground plates attached to the lower end on the front, rear, left, and right sides of the vehicle body. In a vehicle, an overload prevention device for a boom work vehicle regulates the operation of the boom to prevent the boom work vehicle from being overloaded, the device being provided on each of the outrigger jacks and configured to connect the ground plate to the ground plate. a reaction force detector that detects a ground reaction force applied to each of the outrigger jacks when the vehicle is grounded; a tilt angle detector that detects the inclination angle of the vehicle body in a state where it is supported by the outrigger jacks; regulating means for regulating the operation of the boom when any of the ground reaction forces applied to each of the outrigger jacks detected by the force detector exceeds a predetermined value, and the predetermined value is the angle of inclination. An overload prevention device for a boom work vehicle, characterized in that the device is set based on an inclination angle of the vehicle body detected by a detector.