Piston-type pneumatic proportional pressure reducing valve of ball screw driven by servo motor directly

Abstract

The invention provides a piston-type pneumatic proportional pressure reducing valve of a ball screw driven by a servo motor directly. An output shaft of the servo motor is in clearance fit with a sun gear of a planetary reducer, a planet gear of the planetary reducer is connected with a transmission block, the lower end of the transmission block is connected with the ball screw, the ball screw is matched with a lead screw nut, the lower portion of the lead screw nut is connected with a pressure adjusting spring, the lower end of the pressure adjusting spring is connected with a piston, an air inlet and an air outlet are formed in the two sides of a lower valve body, an air feedback hole is formed in the lower valve body, the outer portion of a valve element is connected with a reset spring, and the valve element, the reset spring and a lower end cover are connected in a sealed mode. The servo motor directly drives the lead screw nut to compress the springs so as to achieve linear motion of the valve element, the structure is compact, transmission is stable, and dynamic control can be achieved.

Description

technical field [0001] The invention belongs to the technical field of pneumatic proportional pressure reducing valves, in particular to a piston type pneumatic proportional pressure reducing valve with a servo motor directly driving a ball screw. Background technique [0002] The pressure reducing valve is a pressure control valve that changes the throttling area to generate a pressure drop when the fluid passes through, reduces the inlet pressure to a required outlet pressure, and relies on the energy of the medium itself to keep the outlet pressure automatically stable. The traditional pressure reducing valve can be divided into three types: fixed value, fixed ratio and fixed difference according to the control pressure. They are all mechanical manual pressure regulating valves, and the regulating accuracy is not high enough. For example, the pressure change range of the direct-acting spring film piston pressure reducing valve is generally about 15%-20%, and the pressure...

AI Technical Summary

Problems solved by technology

However, the traditional electrical proportional pressure valves currently used in industrial practice often use specially designed DC proportional electromagnets to adjust the valve output pressure. This traditional proportional valve has high cost, poor dynamic and static performance, and has a certain degree of insensitivity. Zone and hysteresis, and poor linearity, poor resistance to oil and water pollution in compressed air, and low resistance to vibration and shock in machine tool use

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