High-flow high-frequency-response digital valve capable of rotating and being controlled in parallel

Abstract

The invention discloses a high-flow high-frequency-response digital valve capable of rotating and being controlled in parallel. The digital valve is composed of a valve body, a valve sleeve, a left servo motor, a right servo motor and the like. The valve sleeve is arranged in the valve body in a rotation mode, and a valve core is installed in the valve sleeve in a rotation mode. Valve holes for high-pressure oil or low-pressure oil to pass through are formed in two ends of a valve core shaft, the valve holes are matched with spiral grooves formed in corresponding positions on two sides of the valve sleeve, and axial moving of the valve core is achieved by controlling the pressure in cavities on the left side and the right side of the valve core. The right servo motor drives the valve core to rotate, the left servo motor drives the valve sleeve to rotate, bi-directional rotation is achieved through parallel control of the valve core and the valve sleeve, and frequency limit caused by the fact that only the valve core rotates in a traditional valve is broken through. Spiral groove mechanisms with different spiral lead angles are formed in the valve sleeve, valve core rotation is changed into the axial moving, and a function of multi-stage gaining is achieved. By means of parallel connection rotation and digital control of the valve core and the valve sleeve and by means of the spiral groove array structure with the multi-stage gaining function, high flow and high frequency response of the servo valve and precise control of a terminal position are achieved.

Description

technical field [0001] The invention relates to an electro-hydraulic servo valve in the field of fluid transmission and control, in particular to a high-frequency and large-flow digital servo valve that can be controlled in parallel. Background technique [0002] Electro-hydraulic servo systems are widely used in many fields such as aerospace, metallurgy, shipbuilding, and military heavy industry, and their core components are electro-hydraulic servo valves. The high-frequency response characteristics of electro-hydraulic servo valves significantly improve the control performance of high-end equipment (such as large composite material presses, friction welding machines, high-frequency electro-hydraulic vibration tables, electro-hydraulic servo steering gears, and space simulators, etc.). The traditional electro-hydraulic servo valve generally uses a pre-stage drive power slide valve stage, and the input signal is an analog signal. The poor anti-interference ability of the an...

AI Technical Summary

Problems solved by technology

However, as the rotation angle corresponding to each pulse becomes smaller, the number of steps required for the servo motor to rotate the same angle increases, which reduces the response speed of the spool and limits the further improvement of the frequency response of the servo valve under high precision conditions.

[0005] 2) The gain of the pilot stage driving the main stage needs to be improved

The unilateral gain control method currently used in this type of servo screw mechanism (for example, refer to patent 200910153014.6) fails to fully utilize the controllable area of ​​the spool and maximize the gain of the pilot stage driving the main stage to further improve the main valve. Response speed of core action

[0006] 3) The adaptability of the precise control of the terminal position needs to be strengthened

Since the servo valve is designed with both large flow and high frequency response, the flow gain is large, and it is difficult to achieve precise control at the end position of the servo system, which restricts its application in large composite material presses, friction welding machines and other equipment , which limits the improvement of its high-precision control performance and reduces the engineering adaptability of the valve

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