Meso position unloading type flux amplification valve

Abstract

The present invention provides a median offloading type amplificative valve, on which are oil port P and T, oil port A and B, oil port L and R connected with a hydraulic motive proportion reversing valve (5), the oil input ports of the shuttle valve (2) are connected with oil port A and B respectively, the oil output port of the shuttle valve (2) are connected with oil port PAB of the hydraulic motive proportion reversing valve (9), the inlet port of a constant difference overflow valve (3) is connected with oil port P of the hydraulic motive proportion reversing valve (5), the output port ofthe constant difference overflow valve (3) is connected with oil port T, the spring of the constant difference overflow valve (3) is connected with oil port PC of the hydraulic motive proportion reversing valve (5), the inlet of the safety valve (4) is connected with oil port PC of hydraulic motive proportion reversing valve, the output port of the safety valve (4) are connected with oil port T. The median offloading type amplificative valve has merits of energy-saving, small turning vibration, perfect comfort of operation, simple structure, credible work, and can used widely in hydraulic system of project machine.

Description

technical field [0001] The invention relates to a hydraulic flow amplifying valve, in particular to a middle unloading type flow amplifying valve. Background technique [0002] The hydraulic flow amplifying valve is widely used in the steering hydraulic system of large and medium-sized construction machinery. Its function is to amplify the flow and hydraulic power of the pilot control flow output by the steering gear according to a certain amplification factor, and control the movement of the steering hydraulic actuator. At present, the steering hydraulic system has problems such as vibration at the start time, crawling vibration, and vibration at the stop time, resulting in poor operating comfort of construction machinery; at the same time, the steering hydraulic pump cannot be effectively unloaded under non-steering conditions, resulting in energy consumption of the system The main reason for the above problems is the poor performance of the flow amplification valve. Fore...

AI Technical Summary

Problems solved by technology

At present, the steering hydraulic system has problems such as vibration at the start time, crawling vibration, and vibration at the stop time, resulting in poor operating comfort of construction machinery; at the same time, the steering hydraulic pump cannot be effectively unloaded under non-steering conditions, resulting in energy consumption of the system The main reason for the above problems is the poor performance of the flow amplification valve.

Foreign companies such as Kawasaki Heavy Industries, DANFOSS, Carter and other companies have developed some flow amplification valves with better performance, but their structures are more complicated and expensive.

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