Large-diameter proportional pneumatic valve directly driven by alternating-current servo motor

Abstract

The invention discloses a large-diameter proportional pneumatic valve directly driven by an alternating-current servo motor. The large-diameter proportional pneumatic valve directly driven by the alternating-current servo motor comprises the alternating-current servo motor, wherein an output shaft of the alternating-current servo motor is connected with a ball screw to drive a screw nut to reciprocate up and down so as to control the position of a valve core; the upper valve core is in sliding seal fit with a valve body and an upper end cover through a sealing ring respectively; a cavity formed by the seal is communicated with an air source inlet on the valve body through air guide holes formed in the valve body and the upper end cover; the acting force of the lower surface of the valve core is compensated with the acting area so as to reduce load; and the output shaft of the alternating-current servo motor only transfers torque but does not bear the axial force. According to the large-diameter proportional pneumatic valve directly driven by the alternating-current servo motor, the alternating-current servo motor directly drives the valve core to do linear motion by utilizing a ball screw assembly, so that the drive efficiency is high; the output flow and pressure of the valve can be adjusted and the real-time position of the valve core can be easily detected; and an electric control servo system is established to realize closed-loop control so as to improve the dynamic performance of the valve.

Description

technical field [0001] The invention belongs to the technical field of pneumatic transmission and control, in particular to an AC servo motor direct drive type large-diameter proportional pneumatic valve. Background technique [0002] In the industrial field, pneumatic transmission and control are widely used due to their many advantages. The pneumatic device uses compressed air as power to drive a certain component to generate movement. For example, a pneumatic cylinder uses a pneumatic valve to control the flow direction, flow and pressure of the gas, so that the pneumatic piston can move according to the set rule. In large-scale pneumatic cylinder control systems, such as pneumatic clutch and brake systems for mechanical presses, two-position three-way stop valves are widely used, and currently used two-position three-way stop valves are almost all driven by switch-type electromagnets. , that is, the movement position of the spool is only switched in two limit states, th...

AI Technical Summary

Problems solved by technology

In large-scale pneumatic cylinder control systems, such as pneumatic clutch and brake systems for mechanical presses, two-position three-way stop valves are widely used, and currently used two-position three-way stop valves are almost all driven by switch-type electromagnets. , that is, the movement position of the spool is only switched in two limit states, that is, open and closed states, and the adjustment of output flow and pressure cannot be realized, and due to factors such as the connecting pipeline, air source and cylinder pressure, etc. Influence, the dynamic performance of the reversing process is quite different, which cannot meet the requirements of the flexible work of the pneumatic cylinder

[0003] At present, the traditional electric proportional pneumatic valve in the actual industry often uses a specially designed DC-powered proportional solenoid to adjust the output flow and pressure of the valve. This traditional proportional valve has high cost, low action sensitivity, and resistance to oil in compressed air The water pollution ability is poor, and the performance of resisting vibration and shock in the use of machine tools is low. Especially in the case of large diameter, the traditional proportional valve is more expensive and has poor reliability, and mainly depends on foreign imports.

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