High-pressure flow electro-hydraulic servo valve based on ultrasonic motor control and control method

Abstract

The invention discloses a high-pressure flow electro-hydraulic servo valve based on ultrasonic motor control. According to the high-pressure flow electro-hydraulic servo valve based on ultrasonic motor control, an ultrasonic motor rotor is arranged on an ultrasonic motor stator, the ultrasonic motor stator and the ultrasonic motor rotor are tightly pressed by an ultrasonic motor shell, the rear end of a valve element is connected with the front end of the ultrasonic motor rotor, the valve element is arranged in a high-pressure chamber of a valve body, a valve element inner channel is formed inside the valve element, a high-pressure chamber hole is formed in the rear end of the valve element, a low-pressure hole and a high-pressure hole are formed in the front end of the valve element, a valve element oil outlet hole is further formed in the front end of the valve element, a sensing channel is formed in the inner wall of the front end of the valve body and connected with a sensitive chamber in the front end of the valve body, an oil inlet hole is formed in the middle of the valve element, a first valve body oil return hole, a valve body oil inlet hole and a second valve body oil return hole are formed in the valve body, and a first valve body oil outlet hole and a second valve body oil outlet hole are formed in the other side of the valve body. According to the high-pressure flow electro-hydraulic servo valve based on ultrasonic motor control, liquid flow can be adjusted in a high-precision manner under high pressure, and the valve has the advantages of being quick in response, capable of achieving outage self-locking, low in speed, large in torque, simple in structure and the like.

Description

technical field [0001] The present invention relates to the technical field of high-pressure liquid flow control, in particular to a high-precision, fast-response flow adjustment method based on ultrasonic motor control and the structure of a corresponding valve, in particular to a high-pressure flow electro-hydraulic servo valve based on ultrasonic motor control and control methods. Background technique [0002] The current high-pressure liquid flow control mostly adopts the control method of the pilot valve structure, and the low-pressure proportional flow valve is adjusted by the electromagnetic motor to control the high-pressure flow valve. This method greatly increases the complexity and weight of the valve body structure. , which reduces the response speed of the valve; the two-dimensional flow valve takes another approach, designing a resistance half-bridge control method, which can rotate the valve core with a small torque of the motor, and change the pressure of the...

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Problems solved by technology

[0002] The current high-pressure liquid flow control mostly adopts the control method of the pilot valve structure, and the low-pressure proportional flow valve is adjusted by the electromagnetic motor to control the high-pressure flow valve. This method greatly increases the complexity and weight of the valve body structure. , which reduces the response speed of the valve; the two-dimensional flow valve takes another approach, designing a resistance half-bridge control method, which can rotate the valve core with a small torque of the motor, and change the pressure of the flow valve sensitive cavity through the resistance half-bridge, so as to realize the valve core at high Lateral movement under pressure to adjust the flow rate, but due to the small radius of the high and low pressure holes of the resistance half bridge, the rotation accuracy of the spool is high, and the electromagnetic motor cannot meet the required requirements; the ultrasonic motor has high control accuracy , fast response, power-off self-locking and other characteristics, replacing the electromagnetic motor as the driver of the flow valve, can further improve the working characteristics of the valve

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