Fabrication method of single action adjustable pneumatic actuator
1. The traditional fork type pneumatic actuator has a fork. In the process of ventilation, the piston movement promotes the fork rotation, and then drives the transmission shaft. The piston is reset through the return spring to promote the fork rotation, and then the transmission shaft rotates. However, for the existing bifurcated pneumatic actuator, in order to avoid that the valve cannot be fully closed, no matter the valve is opened or closed, the return spring of the actuator is in a compressed state, and the return spring of the actuator is easy to deform and shorten, resulting in that the return spring cannot fully reset the piston, affecting the sealing of the valve when it is closed.
2. The purpose of the utility model is to provide a single action adjustable pneumatic actuator. The utility model can adjust the return spring in real time, so that the piston can be completely reset, thus ensuring the sealing when the valve is closed.
3. To achieve the above purposes, the utility model provides the following technical solutions: a single acting adjustable pneumatic actuator, including a cylinder liner, an end cover installed on both sides of the cylinder liner, a transmission shaft arranged on the cylinder liner, a shift fork and a piston arranged in the cylinder liner, a transmission shaft arranged on the cylinder liner, and a shift fork linkage arranged on the transmission shaft. The piston divides the inside of the cylinder liner into a reset chamber and an intake chamber. The intake port at the cylinder liner side connects the intake chamber and the external air source. One end of the piston close to the dial fork is provided with a pair of extension arms, between the two extension arms is provided with a linkage rod, and the dial fork is provided with a linkage groove suitable for the linkage rod; It also includes a return spring and an adjusting component, including a screw, a pressure plate, an adjusting nut, a limit sleeve and a limit ring. The outer side of the end cover is provided with a rotary interface, and the screw extends to the reset chamber through the rotary interface. The outer end of the rotary interface is provided with a rotary groove, and the rotary groove is provided with a limit rotation. The thread of the adjusting nut is connected with the outer end of the screw, and the adjusting nut is connected with the limit ring. The limit sleeve is installed on the outside of the rotary interface, the outer end face of the limit sleeve is provided with an inward extending limit part, and the limit part is on the outer end face of the limit ring; The inner end of the end cover is provided with a sliding cavity connected with the reset cavity. The pressure plate is installed at the inner end of the screw rod, and is slidably arranged in the sliding cavity and the reset cavity; The return spring is arranged in the return chamber, one end of the return spring contacts the end face of the piston, and the other end of the return spring contacts the end face of the pressure plate.
