Self-diagnosis device and method for line fault of landing leg of overhead working truck

Abstract

An overhead working truck supporting leg line fault self-diagnosis device comprises a controller which comprises a detection resistance plate and a position detection travel switch. The detection resistance plate is composed of a detection resistor A and a detection resistor B, and the resistance values of the detection resistor A and the detection resistor B are different; the position detection travel switch comprises a normally open switch and a normally closed switch; the detection resistor A and the detection resistor B are respectively connected in series with a normally open switch and a normally closed switch; the position detection travel switch is connected with the input end of the controller, and the controller reversely deduces the fault types of the circuit and the detection switch according to different detected resistance values.

Description

technical field [0001] The invention relates to the technical field of outrigger fault diagnosis of an aerial work vehicle, in particular to a device for self-diagnosing circuit faults of an outrigger of an aerial work vehicle. Background technique [0002] As a typical high-altitude manned operation device, the safety and stability of the operation of the aerial work vehicle are the most basic requirements. The compaction detection of the four vertical legs is the most important indicator for the stability of the vehicle. The travel switch for vertical outrigger compaction detection is installed on the upper part of the valve lock of the vertical outrigger cylinder, and the detection wire harness is laid along the hydraulic oil circuit through the inside of the horizontal outrigger, and needs to be stretched with the expansion and contraction of the horizontal cylinder. Because of the tight space inside the leveling legs, wiring harnesses often fail due to pinching or wear....

AI Technical Summary

Problems solved by technology

This solution has the following problems: to realize this function, it is necessary to output a voltage value to the resistor network. When the external line is short-circuited to the ground, a large current will be formed in the loop instantaneously, which will cause the input port of the controller or the detection switch to burn out, and the risk is relatively high.

In addition, the device can only detect the fault state of the wire, but cannot detect the fault state of the detection switch, the fault detection is not comprehensive enough, and when the detection switch fails, the detection result will be inaccurate

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