Hydraulic system for overhead working truck

Abstract

The invention provides a hydraulic system for an overhead working truck. The hydraulic system for the overhead working truck comprises an oil tank and a hydraulic pump, wherein an oil inlet of the hydraulic pump is connected with the oil tank. The hydraulic system for the overhead working truck further comprises a lower supporting leg hydraulic system, an upper working device hydraulic system, anemergency lowering hydraulic system and an upper-lower selection valve, wherein an oil outlet of the hydraulic pump is connected with an oil inlet of the upper-lower selection valve, a first oil outlet of the upper-lower selection valve is connected with upper working device hydraulic system, and a second oil outlet of the upper-lower selection valve is connected with the lower supporting leg hydraulic system. The emergency lowering hydraulic system is connected with the upper working device hydraulic system. According to the hydraulic system for the overhead working truck, an automatic switching between the lower supporting leg hydraulic system and the upper working device hydraulic system is achieved through the upper-lower selection valve, therefore manual operation is avoided, manpoweris saved, and when the hydraulic system for the overhead working truck breaks down, the emergency lowering hydraulic system can be used for retracting an arm support.

Description

technical field [0001] The invention relates to the technical field of aerial work vehicles, in particular to a hydraulic system for aerial work vehicles. Background technique [0002] The aerial work vehicle is a special vehicle for transporting staff and equipment to the work site and performing aerial work. The outrigger hydraulic system of the aerial work vehicle provides rigid support during the operation of the aerial work vehicle, and the hydraulic system of the working device on the vehicle is used to drive the work device to work. At present, the outrigger hydraulic system of the aerial work vehicle is mostly manually controlled, with many control valves and pipelines The layout is complicated. When switching between the hydraulic system of the outriggers and the hydraulic system of the working device on the vehicle, manual control is required, which is time-consuming and laborious. When the hydraulic system of the aerial work vehicle fails, the boom cannot be retra...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a hydraulic system for aerial work vehicles, which solves the need for manual control and the need for manual control when switching between the outrigger hydraulic system of the above-mentioned aerial work vehicle and the hydraulic system of the working device on the vehicle. When the hydraulic system fails, there is a technical problem that the boom cannot be retracted

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