The technology of pneumatic actuators is getting better and better
With the wide application of pneumatic valve, pneumatic actuator technology is getting better and better, the gap between domestic pneumatic actuator and imported pneumatic actuator is getting smaller and smaller, more and more types, now the pneumatic actuator inspection methods are as follows :(1) inspection preparation and appearance inspection 1. All test instruments must be powered up 30 minutes in advance. 2. The test air source pressure should meet the requirements.0.6± 0.1mpa. 3. There is no obvious damage to the appearance of the actuator, no obvious flat trace of the copper gas guide pipe, and firm assembly. The length of the connection screw of the position transmitter must meet the technical requirements of the actuator under inspection; The plane consisting of the connecting rod and the connecting screw on the transmitter shaft shall be perpendicular to the horizontal plane. (2) Inspection standard and method 1. The pneumatic actuator is fixed on the verification platform and connected with the air source respectively. Control air source and displacement detection connecting rod; Accurately adjust the instrument on the calibration table. 2. Mechanical zero calibration: input 4.MA current signal (0%).02mpa, at this time, the cylinder piston stroke is zero; If it is not zero, the nut on the zero adjustment screw can be adjusted (tighten the nut when the zero point is high); The zero point and measuring range need to be adjusted repeatedly; Zero error ≤1%. 3. Mechanical full-scale calibration: input 20mA current signal (100%).10mpa, at this time, the cylinder piston stroke should be the upper limit; If it is not the upper limit, the range can be adjusted by adjusting the tightness of the range spring (when the range is small, when the range is large); The zero point and range need to be adjusted repeatedly; Full range error ≤1%. 4. Mechanical range midpoint positioning: after adjusting the zero and range, input 12mA current signal (50%,.0.06mpa), adjust the position of the position transmitter connecting rod, so that it is perpendicular to the horizontal plane. 5. Full stroke deviation calibration: Input control gas signal 0.02Mpa(0%).036.Mpa (20%).0.052.Mpa (20%).0.068.Mpa (60%).0.084.
