An energy-saving electro-hydraulic proportional directional valve with improved structure and its control method

Abstract

The invention discloses an energy-saving electro-hydraulic proportional directional valve of an improved structure. The electro-hydraulic proportional directional valve comprises a hydraulic valve body, a valve core, a proportional electromagnet and a displacement sensor; the proportional electromagnet is used for driving the valve core to move in the hydraulic valve body; and the displacement sensor is used for measuring the position of the valve core. By designing the size and position relationship of two load throttling openings, two oil supplying openings, one oil return opening and four shoulders, when the opening degree of one of the load throttling openings is controlled through one of the shoulders, the other load throttling opening is in a complete opening state. The invention further provides a control method of the energy-saving electro-hydraulic proportional directional valve, and specific control design is conducted for four working conditions. By using the energy-saving electro-hydraulic proportional directional valve and the control method thereof, under some work states, high-pressure energy does not need to be provided for the electro-hydraulic proportional directional valve at all, only low-pressure energy needs to be provided for the electro-hydraulic proportional directional valve to prevent one cavity of an executing mechanism from being sucked completely,and compared with an existing hydraulic valve control system, hydraulic energy can be greatly saved.

Description

technical field [0001] The invention relates to the field of hydraulic valve technology and its control, in particular to an energy-saving electro-hydraulic proportional directional valve with improved structure. Background technique [0002] Hydraulic valves, especially energized hydraulic proportional directional valves, are widely used in electro-hydraulic servo systems. The energy utilization rate of the system composed of electro-hydraulic proportional directional valves is relatively low. The main reason is that the hydraulic valves have a relatively large throttling loss. This throttling loss is consumed in the form of heat, resulting in the working efficiency of the hydraulic valve control system Not high, the heat is relatively severe, and there is a large waste of energy. [0003] The structural principle of the traditional hydraulic proportional directional valve determines that the opening sizes of its two load throttles are always the same and cannot be adjuste...

AI Technical Summary

Problems solved by technology

The energy utilization rate of the system composed of electro-hydraulic proportional directional valves is relatively low. The main reason is that the hydraulic valves have a relatively large throttling loss. This throttling loss is consumed in the form of heat, resulting in the working efficiency of the hydraulic valve control system Not high, the heat is relatively strong, and there is a large waste of energy

[0003] The structural principle of the traditional hydraulic proportional directional valve determines that the opening sizes of its two load throttles are always the same and cannot be adjusted separately. This working mode determines its , resulting in an additional energy loss

In order to overcome the energy loss caused by this situation, some scholars have proposed to use two or even more proportional valves to control the actuator respectively, and to use multiple valves to control one actuator, which requires coordinated control of multiple valves. Will increase the complexity of the system, on the other hand also increase the cost of the system

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