Method and device for energy-saving control of elastic load based on electrohydraulic servo drive

Abstract

The invention provides a method and a device for energy-saving control of an elastic load based on electrohydraulic servo drive. The device comprises a servo valve, a high-pressure oil source, a low-pressure oil source, an overflow valve and an actuating mechanism, wherein the actuating mechanism is a hydraulic cylinder or a hydraulic motor; an oil supply port of the servo valve is connected with the high-pressure oil source, an oil return port of the servo valve is connected with an oil tank, and a B port of the servo valve is blocked; an A port of the servo valve is connected with an A cavity of the actuating mechanism, the low-pressure oil source is connected with a B cavity of the actuating mechanism, the B cavity of the actuating mechanism is connected with an inlet of the overflow valve, and an outlet of the overflow valve is connected with the oil tank; and the actuating mechanism is connected with the elastic load. A setting principle of the pressure of the low-pressure oil source is that: the force generated by the low-pressure oil source in the B cavity of the actuating mechanism can offset the friction of the actuating mechanism. By the method and the device, the problem that the motion law is difficult to control accurately when the elastic load moves from maximum position to zero position, and energy sources can also be saved.

Description

technical field [0001] The invention relates to an elastic load energy-saving control method and device based on electro-hydraulic servo drive, belonging to the technical field of electro-hydraulic servo control and automation. Background technique [0002] Electro-hydraulic servo system is widely used as a driving mechanism in various load drives due to its advantages of fast response, large output force, and small size. Commonly used electro-hydraulic servo systems include servo valve-controlled cylinder systems and servo valve-controlled motor systems, of which the servo valve-controlled cylinder system is suitable for driving linear motion mechanisms, while the servo valve-controlled motor is suitable for driving rotary motion mechanisms. Of course, through a certain mechanical conversion, linear motion and rotary motion can also be converted to each other. [0003] If the driven load undergoes elastic deformation such as torsion, tension and compression when it is subj...

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Problems solved by technology

[0013] In order to solve the above problems, the present invention proposes a new elastic load control method based on electro-hydraulic servo drive. This method designs a new control oil circuit, and only performs single-chamber control on the electro-hydraulic servo system to solve the problem of elastic load. When the load moves from the maximum position to the zero position, the movement law is difficult to control precisely, and it can also save energy

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