Steering walking hydraulic control system of shear fork type aerial work platform

Abstract

The invention relates to the technical field of hydraulic control of shear fork type aerial work platforms, in particular to a steering walking hydraulic control system of a shear fork type aerial work platform. The steering walking hydraulic control system comprises an overflow valve, a lifting pressure limiting valve, a lifting reversing assembly, a differential pressure valve assembly, a steering pressure limiting valve, a steering feedback valve assembly, a back pressure valve, a walking reversing valve assembly, a self-adaptive balance control valve, an oil supplementing valve, a switching valve, a hydraulic pump, an oil tank, a CSE lifting oil cylinder, a steering oil cylinder, a brake and a walking motor. According to the invention, a integrated valve rear load feedback steering priority system is designed, constant-flow output is achieved, and the influence of load pressure is avoided; the problems that an original system is insensitive in reaction, large in impact, abnormal in composite action and large in energy consumption are solved; an integrated self-adaptive balance control valve achieves floating self-adaptive flow output in the walking process, and meanwhile certain pressure is built in front of the integrated self-adaptive balance control valve and used for automatically starting service braking; and by combining with the oil supplementing valve, the problems of downhill stall, uncontrollability and abnormal sound of a single-side motor are solved.

Description

technical field [0001] The invention relates to the technical field of hydraulic control of scissor-type high-altitude work platforms, in particular to a hydraulic control system for steering and walking of scissor-type high-altitude work platforms. Background technique [0002] The hydraulic control system of the scissor aerial work platform includes the following contents: ①Lifting and reversing system; ②Steering system; The whole machine can be promoted. [0003] At present, the steering and walking control system is used in the market. The oil source is provided by the power unit, and functions such as lifting, steering, and walking are realized through conventional electromagnetic reversing valves. This system has the following defects: ①. The steering priority is not sensitive, and the impact is large. Cause the whole machine to shake, and the safety factor is low; ②Steering and walking act at the same time, making abnormal noise; ③The steering pressure is affected by...

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Problems solved by technology

[0003] At present, the steering and walking control system is used in the market. The oil source is provided by the power unit, and functions such as lifting, steering, and walking are realized through conventional electromagnetic reversing valves. This system has the following defects: ①. The steering priority is not sensitive, and the impact is large. Cause the whole machine to shake, and the safety factor is low; ②Steering and walking act at the same time, making abnormal noise; ③The steering pressure is affected by the walking pressure, resulting in a large loss of system energy consumption; Abnormal noise from the side motor; ⑥The cartridge valve is highly integrated, easy to get stuck, and inconvenient to maintain; the above problems have greatly affected the efficiency and comfort of high-altitude operations

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