Pneumatic actuator

Abstract

The invention relates to a pneumatic actuator. The pneumatic actuator comprises a cylinder block, an actuating box body and a spring cylinder block which are connected with one another, wherein the cylinder block is provided with an air inlet and an air outlet; a piston in the cylinder block is connected with a spring seat in the spring cylinder block through a piston rod which passes through the actuating box body; a return spring is arranged outside the spring seat; the entire piston rod is formed in the middle through butt joint of an actuating block; a rolling shaft is inserted into the actuating block; a roller is sleeved outside the end part of the rolling shaft and matched with a fixed shift fork on an output shaft in the actuating box body; a guide rod which is parallel with the piston rod is arranged in the actuating box body; and the actuating block is provided with a guide hole and is in clearance fit with the guide rod through the guide hole. The defects of easy deformation of the piston rod and the piston and air leakage of the cylinder caused by an ordinary pneumatic actuator in a working process in the prior art are overcome. Due to specific design, the actuating block is matched with the guide rod through the guide hole and linear and stable running is kept. The pneumatic actuator has the advantages of compact structure, high reliability and long service life.

Description

technical field [0001] The invention relates to a pneumatic actuator. Background technique [0002] The pneumatic actuator is a control actuator for opening and closing the valve. Its structure generally includes a cylinder block, an execution box and a spring cylinder. The piston rod is connected with the inner chamber of the spring cylinder. When the piston and the actuator in the piston rod slide to make the shift fork and the output shaft in the actuator box rotate positively and negatively, the valve will open or close accordingly. In traditional pneumatic actuators, when the pressure of the air source pushes the piston, and the piston rod transmits the torque to the fork to rotate, the resistance generated by the rotation of the fork will force the actuator block to slide to the outside to generate force deformation, which will inevitably affect the piston rod. and other moving parts cause fatal damage, resulting in deformation of the piston rod and piston, and air le...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of common pneumatic actuators in the prior art that easily cause deformation of the piston rod and piston and air leakage of the cylinder during the working process, the present invention provides a pneumatic actuator, which has a compact structure and a Stable movement, strong reliability and long service life

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