Inspection preparation and appearance inspection of pneumatic actuator

1.所有測試用儀器均須提前30分鐘通電預(yù)熱；

1. All testing instruments must be powered on for preheating 30 minutes in advance;

2.試驗氣源壓力要滿足0.6±0.1Mpa；

2. The test air source pressure shall meet 0.6 ± 0.1Mpa;

3.執(zhí)行機構(gòu)外觀無明顯損傷，導(dǎo)氣銅管無明顯癟痕且裝配牢固；

3. The appearance of the actuator is free of obvious damage, and the air guide copper pipe is free of obvious dent and firmly assembled;

4.位置變送器連接螺桿長度符合被檢執(zhí)行機構(gòu)型號的技術(shù)要求；緊固在變送器軸上的連桿與連接螺桿所構(gòu)成的平面應(yīng)垂直于水平面；

4. The length of the connecting screw of the position transmitter shall meet the technical requirements of the actuator model to be tested; The plane formed by the connecting rod and connecting screw fastened on the transmitter shaft shall be perpendicular to the horizontal plane;

氣動執(zhí)行器的檢驗標準及方法

Inspection standards and methods for pneumatic actuators

1.將氣動執(zhí)行機構(gòu)固定于校驗臺上，分別接好氣源、控制氣源和位移檢測連桿；將校驗臺上儀表調(diào)校準確；

1. Fix the pneumatic actuator on the calibration bench, and connect the air source, control air source and displacement detection connecting rod respectively; Calibrate the instruments on the calibration bench accurately;

2.機械零點校準：輸入4mA電流信號（0%），控制氣信號應(yīng)為0.02Mpa，此時氣缸活塞行程應(yīng)為零；如果不為零，可通過調(diào)整調(diào)零螺桿上的螺帽調(diào)整零點（零點高了緊螺帽）；零點和量程需要反復(fù)調(diào)整；零點誤差要≤1%；

2. Mechanical zero calibration: input 4mA current signal (0%), the control gas signal should be 0.02Mpa, and the cylinder piston stroke should be zero at this time; If it is not zero, the zero point can be adjusted by adjusting the nut on the zero adjusting screw (the zero point is higher than the tightening nut); The zero point and range need to be adjusted repeatedly; Zero error shall be ≤ 1%;

3.機械滿量程校準：輸入20mA電流信號（100%），控制氣信號應(yīng)為0.10Mpa，此時氣缸活塞行程應(yīng)為上限值；如果不為上限值，可通過調(diào)整量程拉簧的松緊來調(diào)整量程（量程小了松拉簧，量程大了緊拉簧）；零點和量程需要反復(fù)調(diào)整；滿量程誤差要≤1%；

3. Mechanical full range calibration: input 20mA current signal (100%), the control gas signal should be 0.10Mpa, at this time, the cylinder piston stroke should be the upper limit value; If it is not the upper limit value, the range can be adjusted by adjusting the tension of the tension spring of the range (the range is smaller than the tension spring, and the range is larger than the tension spring); The zero point and range need to be adjusted repeatedly; Full scale error shall be ≤ 1%;

4.機械量程中點定位：零點和量程調(diào)準后，輸入12mA電流信號（50%0.06Mpa，），調(diào)整位置變送器連接桿的位置，使其在該點要保持與水平面垂直；

4. Positioning of the midpoint of the mechanical measuring range: after the zero point and measuring range are adjusted, input a 12mA current signal (50% 0.06Mpa,), and adjust the position of the connecting rod of the position transmitter to keep it perpendicular to the horizontal plane at this point;

5.全行程偏差校準：輸入控制氣信號0.02Mpa（0%），然后逐漸增加輸入信號0.036Mpa（20%）、0.052Mpa（20%）、0.068Mpa（60%）、0.084Mpa（80%）、0.1Mpa（100%），使氣缸活塞走完全行程，各點偏差均要≤1.5%；

5. Full stroke deviation calibration: input the control gas signal of 0.02Mpa (0%), then gradually increase the input signals of 0.036Mpa (20%), 0.052Mpa (20%), 0.068Mpa (60%), 0.084Mpa (80%), 0.1Mpa (100%) to make the cylinder piston travel fully, and the deviation at each point shall be ≤ 1.5%;

6.非線性偏差測試：輸入控制氣信號0.02Mpa（0%），然后逐漸增加輸入信號直至0.10Mpa（100%），再將信號降至為0.02Mpa（0%），0.008Mpa使執(zhí)行機構(gòu)走完全行程，并記錄下每增減信號壓力對應(yīng)的行程值，其實際壓力━行程關(guān)系與理論值之間的非線性偏差要≤1%。

6. Nonlinear deviation test: input the control gas signal of 0.02Mpa (0%), then gradually increase the input signal to 0.10Mpa (100%), then reduce the signal to 0.02Mpa (0%), 0.008Mpa to make the actuator travel fully, and record the travel value corresponding to each increase or decrease of signal pressure. The nonlinear deviation between the actual pressure travel relationship and the theoretical value should be ≤ 1%.