Pneumatic actuators is introduced

Pneumatic actuators and pneumatic device or pneumatic actuators are commonly known as the head, is the execution of gas pressure driven or regulating valve opening and closing device. In this paper, the various technical requirements of pneumatic head, is expounded.





structure


1, the pneumatic device is mainly composed of cylinder, piston, gear shaft, end cover, seals, screws, etc; Complete sets of pneumatic device should also include the opening instructions, limit, solenoid valve, locator, pneumatic components, manual institutions, and signal feedback etc parts.


2, pneumatic device connected to the valve size should meet with ISO5211 ( At the bottom) , GB/T12222 and GB/T12223 rules.


3, with manual mechanism of pneumatic device, the gas source is interrupted, should use the manual institution for the valve opening and closing operation, facing the handwheel, should the handwheel or handle counterclockwise for valve open, clockwise for the valve to close.


4, piston rod end for internal and external thread, should be over the spanner wrench.


5, the piston sealing ring should be easy to replace and maintenance.


6, buffering mechanism of pneumatic device, the stroke length of the buffering mechanism can be reference to the provisions of the table 1. 7, with adjustable buffering mechanism of pneumatic device, shall have the external cylinder body adjust the institutions of the cushion.


8, in and out of the air cylinder thread sizes should be consistent with MANUR NORM ( Attachment standard) GB/T7306. 1 GB / T7306。 2 and the provisions of GB/T7307. Performance of



1, the pneumatic device rated output force or moment should comply with the provisions of GB/T12222 and GB/T12223


2, under the condition of light, to enter in the cylinder pressure as stipulated in the 'table 2', its motion should be smooth, no jam and crawl phenomenon. 3, at 0. 6 mpa
under the air pressure of pneumatic device in two directions at opening and closing the output torque and thrust, its value should be no less than the value of pneumatic device sign marked, and action should be flexible, does not allow each part in permanent deformation and other anomalies.


4, sealing experiment with great work pressure, leak out of the amount of air from one side of their back pressure does not allow more than ( 3 + 0. 15 d) cm3/min( Standard state) ; From the output shaft end cover, the amount of air leak out of the does not allow more than
( 3 + 0. 15 d) 立方厘米/分钟。


5, strength test in 1. Big five times working pressure test, and maintain test pressure after 3 min, the cylinder end cover and static sealing parts are not allowed to have leakage and structural deformation.


6, action, service life of pneumatic device simulation of valve, in keeping the two directions of output torque and thrust capacity under the condition of opening and closing operation of the opening and closing times shall be not less than 50000
( Rev. - Once closed loop for) 。


7, buffering mechanism of pneumatic device, when the piston movement to the visit terminal location, impact phenomenon is not allowed. Surface and appearance quality


1, casting the end cover, the end of the cylinder on the flange, casing shall not be cut, cut, porosity, burrs, etc.


2, pneumatic device outside surface coating layer or chemical treatment should level off, smooth, uniform color, no pollution, indentation, and other mechanical damage.