Elevating platform fire truck and control system of landing leg vertical oil cylinder of elevating platform fire truck

Abstract

The invention provides an elevating platform fire truck and a control system of a landing leg vertical oil cylinder of the elevating platform fire truck. The elevating platform fire truck can relieve hydraulic vibration and abnormal noise produced in a high-pressure oil flow direction switching process. The control system comprises a control valve provided with an oil inlet and an oil return port, wherein the control valve is communicated with a rod cavity of the landing leg vertical oil cylinder through a first work oil port of the control valve, a second work oil port is communicated with a rodless cavity of the landing leg vertical oil cylinder, the control system further comprises a decompression oil line making the rodless cavity of the landing leg vertical oil cylinder be communicated with an oil box, the decompression oil line is provided with a throttling element and a decompression valve, and the decompression valve has two work positions used for enabling the decompression oil line to be communicated and disconnected. When landing legs need to be taken back, the decompression valve is controlled to be opened firstly, the decompression valve is in a communicated state, part of high-pressure oil in the rodless cavity can be discharged into the oil box through the throttling element, part of deformation of the oil cylinder caused by locking high pressure can be restored, pre-decompression of the oil cylinder is achieved, and the hydraulic vibration and the noise are avoided.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a control system for controlling a vertical oil cylinder of a support leg. The present invention also relates to a climbing platform fire truck with the above-mentioned control system. Background technique [0002] The climbing platform fire truck is a comprehensive special equipment that integrates the functions of fire fighting, emergency rescue, high-altitude spraying and high-altitude engineering operations. It has a wide range of applications, a large operating area, complete safety limit protection measures and emergency operating systems, and is flexible. Therefore, the climbing platform fire truck has been widely used in modern urban fire protection and is playing an increasingly important role. [0003] With the development of urban high-rise buildings, fire trucks with climbing platforms are increasingly showing a trend of being huge and high in meters, and the requ...

AI Technical Summary

Problems solved by technology

However, the oil closed in the large chamber of the vertical oil cylinder 3' is not the steady-state control pressure of the relief valve 5', but the instantaneous pressure peak caused by the pressure overshoot

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