Pressure compensation throttle control system for oil return path of working device of emergency rescue vehicle

Abstract

The invention discloses a pressure compensation throttle control system for an oil return path of a working device of an emergency rescue vehicle. The system comprises a pump source, a first valve group, a second valve group, an oil supply channel P, an oil return channel T and a load-sensitive oil path LS, wherein the pump source comprises a negative flow control pump, a primary pressure-differentially-set valve, a primary overflow valve and a primary electrically proportional two-position two-way valve; the first valve group comprises four electrically proportional two-position two-way valves, two pressure compensation valves, two shuttle valves and a hydraulic cylinder; the second valve group comprises four electrically proportional two-position two-way valves, two pressure compensationvalves, two shuttle valves and a hydraulic cylinder. The system disclosed by the invention is simple in structure and energy-saving and reliable, can be used in the field of emergency rescue vehicles, and is in particular suitable for occasions where multiple hydraulic actuators work jointly for a long time such as the working devices of the emergency rescue vehicle, for example, a cargo boom, anexcavating arm and an operational platform arm and the like of the emergency rescue vehicle.

Description

technical field [0001] The invention belongs to a hydraulic energy-saving control system, in particular to a pressure compensation and throttling control system for an oil return circuit of an emergency rescue vehicle working device. Background technique [0002] Emergency rescue vehicles are special vehicles for dealing with natural disasters and emergencies. Due to the suddenness of disasters and the uncertainty of scale, vehicles are required to have a long continuous working time, so the energy-saving control of vehicles becomes very important. The current energy-saving methods include power matching optimization, hybrid power, energy recovery, and reduction of throttling loss, among which hydraulic throttling loss accounts for a large part. Compared with other energy-saving methods, reducing throttling loss is more economical and convenient . For example, the Chinese patent "Negative Flow Import and Export Independent Compound Control Hydraulic System" (application num...

AI Technical Summary

Problems solved by technology

The traditional multi-way valve, because the main valve has only one spool, is limited by the degree of freedom, resulting in joint throttling of the actuator inlet and outlet, thus generating unnecessary energy consumption, and because the working conditions of each actuator are different, the main spool section The orifices are different, resulting in complex processing and difficult maintenance, etc.

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