A load-sensing multi-way valve with independently adjustable inlet and outlet throttling sides

Abstract

The invention discloses a load-sensing multi-way valve that can be independently adjusted at the inlet and outlet throttling sides. Each valve includes two three-position three-way proportional reversing valves, two shuttle valves, a pressure cut-off valve and a pressure cut-off valve. Compensation valve, the connection relationship of the components of each group is the same, and each group shares a unified oil inlet circuit P, oil return circuit T, load feedback oil circuit LS and load oil circuit A, B. According to the working conditions of the actuator, the controller sends electrical signals to the corresponding two three-position three-way proportional reversing valves, so as to change the opening of the valve port to control the speed and direction of the hydraulic cylinder. The invention has the characteristics of compact structure and complete functions; it has a variety of intermediate functions and can adapt to different working conditions; the oil inlet and outlet of the actuator can be adjusted independently, which will greatly improve the efficiency of the load sensitive system.

Description

technical field [0001] The invention relates to a load-sensing multi-way valve, in particular to a load-sensing multi-way valve which can be independently adjusted at the inlet and outlet throttling sides. Background technique [0002] In recent years, the load sensing system has been widely used in coal mines, construction and other engineering machinery fields due to its excellent energy-saving effect and good multi-actuator parallel control characteristics. The load sensing system is mainly composed of variable pumps, pressure compensation valves, proportional directional valves and shuttle valves. And other components, the proportional directional valve is the key control element in the load sensing system. [0003] The traditional proportional directional control valve uses a main control spool with multilateral throttling to simultaneously control the inlet and outlet oil circuits of the actuator. Unnecessary throttling loss is caused, which in turn causes the pump ou...

AI Technical Summary

Problems solved by technology

[0003] The traditional proportional directional control valve uses a main control spool with multilateral throttling to simultaneously control the inlet and outlet oil circuits of the actuator. Unnecessary throttling loss is avoided, which in turn causes the pump outlet pressure to rise

Therefore, although the traditional valve control system can achieve a better motion control effect, it will increase the energy consumption and reduce the efficiency of the system to a certain extent.

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