An Electro-hydraulic Proportional Directional Valve with Independent Valve Port Control

Abstract

The invention relates to an electro-hydraulic proportional directional valve with independent valve port control. The valve includes: a pilot valve body, a main valve, a first pilot valve core, a first pilot valve spring, a second pilot valve core, a second pilot valve spring, a first electromagnet and a second electromagnet. The main valve includes an upper cover plate, a first flow control cavity and a second flow control cavity. The invention uses two electromagnets to independently control the displacement of the two pilot valve cores, and uses two flow control chambers to independently control the two valve ports in the electro-hydraulic proportional directional valve, which can reduce system pressure loss and improve system efficiency. Energy efficiency, and the displacement of the main valve of the present invention is proportional to the displacement of the pilot valve, and the proportional control of the displacement of the main valve core can be realized without additional displacement sensors, avoiding the failure of the displacement sensor of the traditional pilot-controlled electro-hydraulic proportional directional valve When the system is out of control, it simplifies the complexity of the control and reduces the cost of the valve.

Description

technical field [0001] The invention relates to the field of electro-hydraulic proportional control systems, in particular to an electro-hydraulic proportional directional valve with independent valve port control. Background technique [0002] The electro-hydraulic proportional directional valve is a very important component in the electro-hydraulic proportional control technology. Its function is to continuously control the direction and flow of the fluid. Control type electro-hydraulic proportional directional valve, usually a four-way linkage valve, throttles the inlet and outlet at the same time, and can only control the pressure or flow of the single chamber of the actuator at the same time. Low-level problems, especially in over load conditions, this problem is more serious. [0003] Aiming at the problems existing in the traditional pilot-controlled four-way linkage valve, the existing solution is to use the method of independent control of the inlet and outlet, and...

AI Technical Summary

Problems solved by technology

[0002] The electro-hydraulic proportional directional valve is a very important component in the electro-hydraulic proportional control technology. Its function is to continuously control the direction and flow of the fluid. Control type electro-hydraulic proportional directional valve, usually a four-way linkage valve, throttles the inlet and outlet at the same time, and can only control the pressure or flow of the single chamber of the actuator at the same time. Inferior problem, especially in over load conditions, this problem is more serious

[0003] Aiming at the problems existing in the traditional pilot-controlled four-way linkage valve, the existing solution is to use the method of independent control of the inlet and outlet, and use two three-position three-way valves or four two-position two-way valves to control the pressure of the two chambers of the hydraulic actuator respectively. and flow rate, which increases the degree of control freedom and reduces the throttling loss and energy consumption of the system. However, at present, in order to control the displacement of the main valve core of this type of valve, it is necessary to add a displacement sensor to detect the displacement of the main valve core and form a closed loop for control. , which increases the cost and control complexity of the valve, and once the sensor fails, the system will be out of control, causing risks such as safety accidents

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