A device and method for calibrating and setting the gas lock valve in three-break self-locking protection

Abstract

The present invention discloses a device and method for calibrating and setting the gas lock valve in the three-break self-locking protection, which belongs to the field of automated instrument measurement. It includes a calibration gas source connected by pipelines, a two-way valve, a core, a three-way pneumatic quick connector, a filter pressure reducing valve, a pressure gauge, a two-way pneumatic quick connector, a gas lock valve, a three-way valve, and an emptying box. The calibration gas source is connected to a two-way and a three-way pneumatic quick connector through a main pipeline, and two branch pipelines are connected to the three-way pneumatic quick connector. The two branch pipelines are respectively provided with a filter pressure reducing valve and a pressure gauge a, and the output ends of the two branch pipelines are respectively connected to the gas lock valve, and the outlet end of the gas lock valve is connected to a pressure gauge b and an emptying box through a pipeline and a three-way valve. The present invention solves the problem of failure of the three-break self-locking due to a large deviation between the pressure value of the gas lock valve switching point and the theoretical pressure switching value or poor sealing, improves the reliability of the three-break self-locking, ensures the stable operation of the adjustment system, and is easy to promote and use.

Description

Technical Field

[0001] The present invention relates to the field of automated instrument measurement, and in particular to a device and method for calibrating and setting an air lock valve in a three-break self-locking protection, and in particular to a device and method for accurately setting a switching point pressure value of an air lock valve in a three-break self-locking device of a pneumatic long-stroke actuator. Background Art

[0002] Pneumatic actuators are widely used in metallurgy, electric power, petroleum, chemical industry and other industries. It is an important terminal execution instrument in the process control system, which has a great impact on the quality of control system regulation and safe and stable operation. Pneumatic actuators have the characteristics of simple structure, convenient installation, reliable operation, easy operation and small maintenance. In addition, even if a pneumatic actuator leaks, it will not pollute the environment. It has good adaptability to the working environment and is not affected by harsh environments such as flammable, explosive, strong magnetic and strong radiation. However, if the actuator does not have a stable fault valve position holding function, or the holding function cannot work reliably, it will directly affect the complete function of the regulation system, resulting in failure of the regulation system and even production accidents.

[0003] The three-break self-locking device is an effective device to improve the stable operation of pneumatic long-stroke actuators. However, the current device for accurately setting the pressure value of the air lock valve switching point is imperfect, that is, there is no offline calibration device, and it is impossible to calibrate quickly online. Before use, the pressure value switching point of the air lock valve cannot be accurately set, and the sealing performance of the air lock valve cannot be detected, making the air lock valve failure an important reason for the failure of the three-break self-locking performance. If the sealing quality of the air lock valve cannot be accurately judged based on experience and guesswork alone, it is even more impossible to know the size of the cut-off point pressure value. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for calibrating and setting the gas lock valve in the three-break self-locking protection, which solves the technical problem of the failure of the three-break self-locking caused by the large deviation between the pressure value of the gas lock valve switching point and the theoretical pressure switching value or the poor sealing, improves the reliability of the three-break self-locking, and ensures the stable operation of the adjustment system.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A device for calibrating and setting an air lock valve in a three-break self-locking system, characterized in that it comprises a calibration gas source 1, an air lock valve 6, the air lock valve 6 being the calibrated air lock valve, the calibration gas source 1 being connected to a main pipeline, the main pipeline being connected to a two-way valve 2, the end of the main pipeline being connected to a three-way pneumatic quick connector 7 through a bushing 3, the three-way pneumatic quick connector 7 being connected to two branch pipelines, both branch pipelines being provided with a filter pressure reducing valve 4 and a pressure gauge a5 in sequence, one of the branch pipelines being connected to a two-way valve 2 through a bushing 3, and a two-way valve 2 being provided. The end of the branch pipeline of valve 2 is connected to the SIG port of the air lock valve 6 through a two-way pneumatic quick connector 8, and the end of the other branch pipeline is connected to the IN1 port of the air lock valve 6 through a two-way pneumatic quick connector 8. The OUT1 port of the air lock valve 6 is connected to a pipeline through a two-way pneumatic quick connector 8. A three-way valve 9 is provided at the outlet of the pipeline. The two outlets of the three-way valve 9 are respectively connected to an emptying box 10 and a pressure gauge b11. Two-way pneumatic quick connectors 8 are provided on the IN2 port and OUT2 port of the air lock valve 6.

[0007] The pressure gauge a5 is connected to the branch line through a three-way pneumatic quick connector 7 and a bushing 3. A two-way valve 2 is provided between the pressure gauge a5 and the branch line. The filter pressure reducing valve 4 is connected to the branch line through a two-way pneumatic quick connector 8.

[0008] The two-way valve 2 is a DN15 stainless steel internal threaded two-way ball valve, and the three-way valve 10 is a DN15 stainless steel internal threaded three-way ball valve.

[0009] The filter pressure reducing valve 4 is an ARF4000 pressure regulating filter.

[0010] The bushing 3 is a G1 / 2 external to G1 / 4 internal bushing, and the main pipeline, branch pipeline, and pipeline are all PE8*5mm pneumatic hoses. The main pipeline, branch pipeline, pipeline and other air source pipelines are fixed on the calibration table through U-shaped M20 fixing clips with φ6mm screw holes on both sides.

[0011] The pressure gauge a5 and the pressure gauge b11 are both precision pressure gauges of model YB-150A with an accuracy of 0.4.

[0012] The two-way pneumatic quick connector 8 is a PL8-02 / L type pneumatic quick-insert external thread elbow, and the three-way pneumatic quick connector 7 is a PB8-02 / T type three-way positive thread pneumatic quick connector.

[0013] The air lock valve 6 is a YT-400 double-acting air lock valve.

[0014] The emptying box is an iron box made of 100*100*80mm steel plate with a thickness of 6mm.

[0015] The calibration setting method of the device for calibrating and setting the gas lock valve in the three-break self-locking is characterized by comprising the following steps:

[0016] Step 1: When there is no pressure at the SIG port of the air lock valve 6, close the outlet of the three-way valve 9 connected to the evacuation box 10, open the two-way valve 2 at the calibration gas source 1, adjust the filter pressure reducing valve 4 at the inlet side of the air lock valve 6IN1 to make the pressure at the inlet of the air lock valve 6IN1 0.55MPa, and observe the displayed value of the pressure gauge b11. If the pressure of the quasi-air lock valve 6IN1 is always 0.55MPa, and the displayed value of the pressure gauge b11 is always zero within five minutes, the sealing of the air lock valve 6IN1 side is intact;

[0017] Step 2: Close the two-way valve 2 at the calibration gas source 1, and observe the displayed value of the pressure gauge a5 on the air inlet side of the air lock valve 6IN1. When the pressure is zero, remove the branch line on the inlet side of the air lock valve 6IN1 from the two-way pneumatic quick connector 8 at IN1 and connect it to the two-way pneumatic quick connector 8 at the IN2 port of the air lock valve. At the same time, remove the two-way pneumatic quick connector 8 from the outlet pipeline of the air lock valve 6OUT1 from the OUT1 port and connect it to the two-way pneumatic quick connector 8 at the OUT2 port. Under any pressure, open the two-way valve 2 at the calibration gas source 1, adjust the filter pressure reducing valve 4 on the inlet side of the gas lock valve 6IN2 to make the pressure on the inlet of the gas lock valve 6IN2 0.55MPa, and observe the displayed value of the pressure gauge b11. If the pressure of the gas lock valve 6IN2 is always 0.55MPa, and the displayed value of the pressure gauge b11 is always zero within five minutes, the sealing of the gas lock valve 6IN2 side is intact; the sealing of the gas lock valve 6IN1 and IN2 sides is intact, which proves that the sealing of the gas lock valve 6 is intact;

[0018] Step 3: After the sealing test of the air lock valve 6 is completed, adjust the filter pressure reducing valve 4 on the IN2 side of the air lock valve 6 so that the inlet pressure of the air lock valve 6 IN2 is 0.50MPa, adjust the pressure of the filter pressure reducing valve 4 on the SIG side of the air lock valve 6 to zero, open the two-way valve 2 on the branch line on the SIG side of the air lock valve 6, slowly increase the pressure of the filter pressure reducing valve 4 on the SIG side of the air lock valve and observe the display value of the pressure gauge b11. When the display value of the pressure gauge b11 increases from zero to 0.50MPa, write down the display value of the pressure gauge a5 on the IN2 side of the air lock valve. According to the pressure used by the on-site actuator, determine the switching point pressure of the air lock valve 6 and set the pressure to 0.3MPa. However, when the pressure is less than 0.3MPa and the display value of the pressure gauge b11 is 0.50MPa, increase the pressure switching point of the air lock valve 6, adjust the pressure on the SIG side of the air lock valve to 0.3MPa, open the exhaust outlet of the three-way valve 9, and adjust the pressure adjusting screw of the air lock valve 6 Slowly increase the pressure switching point, and continue to empty until there is no pressure on the pressure gauge b11; when the pressure is greater than 0.3MPa and the pressure display value of the pressure gauge b11 is 0.50MPa, reduce the pressure switching point of the air lock valve 6, adjust the pressure on the air lock valve SIG side to 0.3MPa, open the emptying outlet of the three-way valve 9, and slowly reduce the pressure switching point by adjusting the pressure adjusting screw of the air lock valve 6, and continue to empty until the display value of the pressure gauge b11 is 0.50MPa, then close the emptying outlet of the three-way valve 9; after setting the pressure to 0.3MPa, increase the pressure on the input side to 0.50MPa by adjusting the filter pressure reducing valve 4 on the input side of the air lock valve 6SIG, open the outlet of the three-way valve 9 connected to the emptying box, and then reduce the pressure on the IN2 side of the air lock valve 6. When the pressure on the pressure gauge b11 is close to 0.50MPa, record the pressure value of the switching point, repeat the above process two or three times to obtain the first pressure switching point;

[0019] Step 4: Close the two-way valve 2 at the calibration gas source 1, observe the displayed value of the pressure gauge a5 on the air inlet side of the gas lock valve IN1, when the pressure is zero, remove the branch line on the air inlet side of the gas lock valve IN2 from the two-way pneumatic quick connector 8 at the IN2 port and connect it to the two-way pneumatic quick connector 8 at the IN1 port, and at the same time remove the two-way pneumatic quick connector 8 on the OUT2 side of the pipeline from the OUT2 port and connect it to the two-way pneumatic quick connector 8 at the OUT1 port, close the outlet of the three-way valve 9 connected to the emptying box, adjust the pressure of the filter pressure reducing valve 4 on the SIG side of the gas lock valve to zero, and open the two-way valve 9 at the calibration gas source 1. Open valve 2, adjust the filter pressure reducing valve 4 on the SIG side of the gas lock valve to make the pressure of the gas lock valve IN1 inlet 0.50MPa, open the two-way valve on the branch line on the SIG side of the gas lock valve, slowly increase the pressure of the filter pressure reducing valve on the SIG side of the gas lock valve and observe the displayed value of the pressure gauge b11. When the displayed value of the pressure gauge b11 increases from zero to 0.50MPa, write down the displayed value of the pressure gauge a5 on the IN1 side of the gas lock valve. According to the pressure used by the on-site actuator, determine the switching point pressure of the gas lock valve and set the pressure to 0.3MPa. However, when the pressure is less than 0.3MPa, the pressure gauge b11 has When there is pressure and the displayed value is 0.50MPa, increase the pressure switching point of the air lock valve, adjust the pressure on the SIG side to 0.3MPa, open the outlet of the three-way valve 9 connected to the emptying box, and slowly increase the pressure switching point by adjusting the pressure adjusting screw of the air lock valve 6. If there is pressure, continue to repeat the above steps until there is no pressure when the exhaust is emptied; when the pressure is greater than 0.3MPa, the pressure gauge b11 will have a pressure display value of about 0.50MPa, reduce the pressure switching point of the air lock valve, adjust the pressure on the SIG side of the air lock valve to 0.3MPa, open the outlet of the three-way valve 9 connected to the emptying box, and adjust the pressure by adjusting the pressure adjusting screw of the air lock valve 6. Adjust the pressure adjustment screw of the air lock valve 6 to slowly reduce the pressure switching point. If there is no pressure, continue to repeat the above steps until the pressure gauge b11 is emptied to 0.50MPa, then close the drain valve; after setting the pressure to 0.3MPa, increase the pressure on the input side by adjusting the filter pressure reducing valve 4 on the input side of the air lock valve 6SIG to 0.50MPa, open the outlet of the three-way valve 9 connected to the drain box, and then reduce the pressure on the IN1 side of the air lock valve until there is pressure on the pressure gauge b11 and the pressure is 0.50MPa, record the pressure value of the switching point at this time, and obtain the second pressure switching point;

[0020] Step 5: Compare the pressure value of the switching point recorded in step 3 with the pressure value of the switching point recorded in step 4. When the two are equal, this pressure value is the pressure value of the switching point of the air lock valve.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The present invention can accurately set the pressure value of the air lock valve switching point by comparing the actual on-site use pressure of the pneumatic long-stroke actuator, and detect the sealing performance of the air lock valve at the same time; can accurately judge the applicability of the air lock valve used for the first time; can locate or rule out whether the three-stage self-locking fault of the on-site pneumatic long-stroke actuator is caused by the air lock valve;

[0023] 2. The present invention can be quickly connected through a pneumatic quick connector each time the air lock valve is calibrated or troubleshooted, and the quality of the air lock valve can be quickly judged according to the calibration steps, and the switching point pressure value of the air lock valve can be quickly and accurately set, which has the characteristics of simplicity, convenience, reliability and stability;

[0024] 3. The present invention can be calibrated online on site, which can improve the efficiency of fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Markings in the figure: 1- calibration gas source; 2- two-way valve; 3- core filling; 4- filter pressure reducing valve; 5- pressure gauge a; 6- air lock valve; 7- three-way pneumatic quick connector; 8- two-way pneumatic quick connector; 9- three-way valve; 10- emptying box; 11- pressure gauge b. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Example:

[0029] A device for calibrating and setting a gas lock valve in a three-break self-locking system, such as Figure 1 , including a calibration gas source 1, an air lock valve 6, the air lock valve 6 is an air locked valve, the calibration gas source 1 is connected to a main pipeline, the main pipeline is connected to a two-way valve 2, the end of the main pipeline is connected to a three-way pneumatic quick connector 7 through a core plug 3, the three-way pneumatic quick connector 7 is connected to two branch pipelines, both branch pipelines are provided with a filter pressure reducing valve 4 and a pressure gauge a5 in sequence, one of the branch pipelines is connected to a two-way valve 2 through a core plug 3, and the end of the branch pipeline provided with the two-way valve 2 is connected to the two-way valve 2 through the two-way valve 3. A pneumatic quick connector 8 is connected to the SIG port of the gas lock valve 6, and the end of another branch pipeline is connected to the IN1 port of the gas lock valve 6 through a two-way pneumatic quick connector 8. The OUT1 port of the gas lock valve 6 is connected to a pipeline through a two-way pneumatic quick connector 8. A three-way valve 9 is provided at the outlet of the pipeline. An emptying box 10 and a pressure gauge b11 are respectively connected to the two outlets of the three-way valve 9. Two-way pneumatic quick connectors 8 are provided on the IN2 port and the OUT2 port of the gas lock valve 6.

[0030] The pressure gauge a5 is connected to the branch line through a three-way pneumatic quick connector 7 and a bushing 3. A two-way valve 2 is provided between the pressure gauge a5 and the branch line. The filter pressure reducing valve 4 is connected to the branch line through a two-way pneumatic quick connector 8.

[0031] The two-way valve 2 is a DN15 stainless steel internal threaded two-way ball valve, and the three-way valve 10 is a DN15 stainless steel internal threaded three-way ball valve, wherein the two-way ball valve is used for switching the total air source pressure and the air source pressure on the lock valve 6SIG side, and the three-way ball valve is used for switching the air circuit, or for connecting to a pressure gauge b, or for connecting to an exhaust box for exhausting gas.

[0032] The filter pressure reducing valve 4 is an ARF4000 pressure regulating filter. The filter pressure reducing valve 4 is mainly used to control the air source pressure and filter other impurities in the medium, and the air inlet side is connected to the air source pipeline.

[0033] The bushing 3 is a G1 / 2 external to G1 / 4 internal bushing, which is mainly used for the conversion of the gas source pipe diameter. In order to make a fixed calibration platform, the calibrated gas lock valve can be removed at any time.

[0034] The main pipeline, branch pipeline, pipeline and other gas source pipelines are all PE8*5mm pneumatic hoses, which are mainly used for connecting the gas circuits after the two-way pneumatic quick connector 8 and the three-way pneumatic quick connector 7. The gas source pipeline is fixed on a simply made calibration table through a U-shaped M20 fixing clip with φ6mm screw holes on both sides.

[0035] The calibration table is a 800*600*6mm steel plate, and holes are punched on the calibration table to fix the gas source pipeline and the gas lock valve to be calibrated.

[0036] The pressure gauge a5 and the pressure gauge b11 are both precision pressure gauges of model YB-150A with an accuracy of 0.4. They are mainly used to monitor the inlet air supply pressure of the gas lock valve and accurately measure the outlet side pressure of the gas lock valve. The precision pressure gauge used on the SIG side of the gas lock valve is used to determine the size of the switching point pressure value.

[0037] The two-way pneumatic quick connector 8 is a PL8-02 / L type pneumatic quick-insert external thread elbow, and the three-way pneumatic quick connector 7 is a PB8-02 / T type three-way positive thread pneumatic quick connector.

[0038] The air lock valve 6 is a YT-400 double-acting air lock valve.

[0039] The emptying box is an iron box made of 100*100*80mm steel plate with a thickness of 6mm.

[0040] The calibration setting method of the device for calibrating and setting the gas lock valve in the three-break self-locking comprises the following steps:

[0041] Step 1: When there is no pressure at the SIG port of the air lock valve 6, close the connection port between the three-way valve 9 and the evacuation box 10, open the two-way valve 2 at the calibration gas source 1, adjust the filter pressure reducing valve 4 at the inlet side of the air lock valve 6IN1 to make the pressure at the inlet of the air lock valve 6IN1 0.55MPa, and observe the displayed value of the pressure gauge b11. If the pressure of the quasi-air lock valve 6IN1 is always 0.55MPa, and the displayed value of the pressure gauge b11 is always zero within five minutes, the sealing of the air lock valve 6IN1 side is intact;

[0042] Step 2: Close the two-way valve 2 at the calibration gas source 1, observe the displayed value of the pressure gauge a5 on the air inlet side of the air lock valve 6IN1, when the pressure is zero, remove the branch line on the inlet side of the air lock valve 6IN1 from the two-way pneumatic quick connector 8 at IN1, and connect it to the two-way pneumatic quick connector 8 at the IN2 port of the air lock valve, and at the same time remove the two-way pneumatic quick connector 8 at the OUT1 port of the outlet pipeline of the air lock valve 6OUT1 and connect it to the two-way pneumatic quick connector 8 at the OUT2 port. When there is no pressure at the SIG port of the air lock valve, open the two-way valve 2 at the calibration gas source 1, adjust the filter pressure reducing valve 4 on the inlet side of the air lock valve IN2 to make the pressure at the inlet of the air lock valve IN2 0.55MPa, observe the displayed value of the pressure gauge b11, if the pressure of the air lock valve IN2 is always 0.55MPa, and the displayed value of the pressure gauge b11 is always zero within five minutes, then the sealing of the IN2 side of the air lock valve 6 is intact; this proves that the sealing of the air lock valve 6 is intact;

[0043] Step 3: After the sealing test of the air lock valve 6 is completed, adjust the filter pressure reducing valve 4 on the IN2 side of the air lock valve 6 so that the pressure at the inlet of the IN2 of the air lock valve 6 is 0.50MPa, adjust the pressure of the filter pressure reducing valve 4 on the SIG side of the air lock valve 6 to zero, open the two-way valve 2 on the branch line on the SIG side of the air lock valve 6, slowly increase the pressure of the filter pressure reducing valve 4 on the SIG side of the air lock valve and observe the displayed value of the pressure gauge b11. When the displayed value of the pressure gauge b11 suddenly increases from zero and approaches 0.50MPa, write down the displayed value of the pressure gauge a5 on the IN2 side of the air lock valve. According to the pressure used by the on-site actuator, determine the switching point pressure of the air lock valve 6 and set the pressure to 0.3MPa. When the pressure is less than 0.3MPa and the pressure gauge b11 already has pressure and the displayed value is 0.50MPa, it is necessary to increase the pressure of the air lock valve 6. , adjust the pressure switching point of the gas lock valve 6 to 0.3MPa, open the outlet connected to the three-way valve 9 and the drain box 10, and slowly increase the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve 6. If there is pressure, continue to repeat the above steps until there is no pressure in the exhaust; if the pressure is greater than 0.3MPa, the pressure display value of the pressure gauge b11 on the OUT2 side of the gas lock valve is only 0.50MPa, and it is necessary to reduce the pressure switching point of the gas lock valve 6, adjust the pressure on the SIG side of the gas lock valve to 0.3MPa, open the drain side of the three-way valve 9, and slowly reduce the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve. If there is no pressure, continue to repeat the above steps until there is pressure in the exhaust, close the outlet connected to the three-way valve 9 and the drain box 10, and check the display value of the pressure gauge b11, which should be around 0.50MPa. Increase the pressure on the input side by adjusting the filter pressure reducing valve 4 on the SIG input side until the pressure is 0.50 MPa, open the exhaust side of the three-way valve 9, and then reduce the pressure on the gas lock valve IN2 side until the pressure gauge b11 has pressure and is close to 0.50 MPa, record the pressure at the switching point at this time, repeat the above process two or three times to obtain the first pressure switching point;

[0044] Step 4: Close the two-way valve 2 at the calibration gas source 1, observe the displayed value of the pressure gauge a5 on the air inlet side of the gas lock valve IN1, and perform the following operations when the pressure is zero: remove the branch line on the air inlet side of the gas lock valve IN2 from the two-way pneumatic quick connector 8 at the IN2 port, and connect it to the two-way pneumatic quick connector 8 at the IN1 port. At the same time, remove the two-way pneumatic quick connector 8 on the OUT2 side of the pipeline from the OUT2 port and connect it to the two-way pneumatic quick connector 8 at the OUT1 port. Close the exhaust side of the three-way valve 9, adjust the pressure of the filter pressure reducing valve 4 on the SIG side of the gas lock valve to zero, and open the two-way valve 9 at the calibration gas source 1. Open valve 2, adjust the filter pressure reducing valve 4 on the SIG side of the air lock valve to make the pressure of the IN1 inlet 0.50MPa, open the two-way valve on the SIG side branch line, slowly increase the pressure of the filter pressure reducing valve and observe the displayed value of the pressure gauge b11. If the displayed value of the pressure gauge b11 suddenly increases from zero and approaches 0.50MPa at a certain moment, then write down the displayed value of the pressure gauge a5 on the IN1 side inlet. According to the pressure used by the on-site actuator, determine the switching point pressure of the air lock valve. The pressure is usually set to 0.3MPa. If the pressure is less than 0.3MPa, the pressure gauge b11 already has pressure and displays If the displayed value is 0.50MPa, it is necessary to increase the pressure switching point of the gas lock valve, adjust the pressure on the SIG side to 0.3MPa, open the exhaust side of the three-way valve 9, and slowly increase the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve. If there is pressure, continue to repeat the above steps until the exhaust is pressure-free; if the pressure is greater than 0.3MPa, the pressure gauge b11 will only have a pressure display value of about 0.50MPa, then it is necessary to reduce the pressure switching point of the gas lock valve, adjust the pressure on the SIG side to 0.3MPa, open the exhaust side of the three-way valve 9, and slowly reduce the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve. Change point. If there is no pressure, continue to repeat the above steps until there is pressure when emptying. Close the drain valve and check the display value of pressure gauge b11, which should be around 0.50MPa. Increase the pressure on the input side by adjusting the filter pressure reducing valve 4 on the SIG input side until the pressure is 0.50MPa. Open the drain side of the three-way valve 9, and then reduce the pressure on the IN1 side until there is pressure on pressure gauge b11 and it is close to 0.50MPa. Note the pressure at this switching point to obtain the second pressure switching point. Compare the two recorded pressure values. If they are approximately equal, this pressure value is the pressure value of the air lock valve switching point.

[0045] Embodiment 1:

[0046] like Figure 1As shown, the gas source is cut off by the two-way ball valve 2 on the main pipeline, and the pipeline is converted into a G1 / 4 interface using a conversion bushing 3. The pipeline is fixed on the calibration table with a U-shaped fixing card. The gas circuit is converted into two circuits using a PB8-02 / T-type three-way positive thread pneumatic quick connector, and the two circuits are connected using a PL8-02 / L-type pneumatic quick plug external thread elbow. One of the outputs is connected to the filter pressure reducing valve, and the output end of the filter pressure reducing valve is connected to the PB8-02 / T-type three-way positive thread pneumatic quick connector. One port of the T-type three-way is connected to the YB-150A precision pressure gauge through a conversion bushing and a two-way ball valve. The precision pressure gauge is mainly used to detect whether there is pressure in the gas circuit. The other output end of the T-type three-way is suspended to connect the pipeline; the other output of the gas source T-type three-way conversion is connected to the filter pressure reducing valve. The pipeline is controlled by setting a ball valve to control the on-off of the gas circuit, and a precision pressure gauge is used in the gas circuit to accurately measure the gas circuit pressure. The G1 / 4 inner to G1 / 2 outer bushing is connected to the three-way ball valve and fixed with a U-shaped clamp at the middle position of the pipeline connecting the three-way ball valve and the end of the three-way ball valve. The inner core of the bushing is in a suspended state. The output port on the closed side of the three-way ball valve is connected to the drain box, and the other output port of the three-way ball valve is connected to a YB-150A precision pressure gauge.

[0047] The five ports of the calibrated gas lock valve, namely the IN1 port, the IN2 port, the OUT1 port, the OUT2 port, and the SIG signal control port, are respectively connected with the PL8-02 / L type pneumatic quick-connect external thread elbow, which are fixed by the fixing screws of the gas lock valve, and the T-type three-way suspended output end of the branch pipeline without a two-way ball valve is quickly connected to the PL8-02 / L type pneumatic quick-connect external thread elbow at the IN1 port of the gas lock valve through a pipeline; the PL8-02 / L type pneumatic quick-connect external thread elbow at the OUT1 port of the gas lock valve is connected to the inner core of the bushing at the inlet of the three-way ball valve through a pipeline; the output port of the branch pipeline with a two-way ball valve is connected to the PL8-02 / L type pneumatic quick-connect external thread elbow of the SIG signal control port of the gas lock valve, the gas circuit is reliably closed by a ball valve, and the precision pressure gauge on it is used to confirm that there is no pressure in the gas circuit.

[0048] When there is no pressure at the SIG port of the gas lock valve, close the exhaust side of the three-way ball valve, open the gas source control ball valve on the main pipeline, adjust the filter pressure reducing valve on the IN1 side branch pipeline to make the pressure at the inlet of the gas lock valve IN1 to 0.55MPa, and observe the displayed value of the precision pressure gauge on the outlet side of the gas lock valve OUT1, that is, the displayed value of the precision pressure gauge connected to the three-way ball valve. If the pressure of the gas lock valve IN1 is always 0.55MPa, the displayed value of the precision pressure gauge on the OUT1 side of the gas lock valve is always zero within five minutes, which means that the sealing of the gas lock valve IN1 side is intact; close the two-way ball valve at the gas source, observe the displayed value of the precision pressure gauge on the air inlet side of the gas lock valve IN1, and perform the following operation when the pressure is zero. Remove the quick connector between the pipeline and the gas lock valve IN1 and connect it to the quick connector at the gas lock valve IN2. At the same time, remove the quick connector between the pipeline connecting the three-way ball valve and the gas lock valve OUT1 and connect them to the quick connector at the gas lock valve OUT2. When there is no pressure at the SIG port of the gas lock valve, open the two-way ball valve on the main pipeline, adjust the filter pressure reducing valve to make the pressure at the inlet of the gas lock valve IN2 to 0.55MPa, and observe the displayed value of the precision pressure gauge on the outlet side of the gas lock valve OUT2. If the pressure of the gas lock valve IN2 is always less than 0.55MPa, the displayed value of the precision pressure gauge on the gas lock valve OUT1 side is always zero within five minutes, indicating that the sealing of the gas lock valve IN2 side is intact. The above two steps can prove that the sealing of the gas lock valve is intact.

[0049] After the air lock valve sealing test is completed, adjust the filter pressure reducing valve so that the pressure at the inlet of the air lock valve IN2 is 0.50MPa, adjust the pressure of the filter pressure reducing valve on the SIG side of the air lock valve to zero, open the gas circuit control ball valve on the branch line on the SIG side of the air lock valve, slowly increase the pressure of the filter pressure reducing valve and observe the displayed value of the precision pressure gauge on the OUT2 side of the air lock valve. If at a certain moment the displayed value of the precision pressure gauge on the OUT2 side of the air lock valve suddenly increases from zero and approaches 0.50MPa, then write down the displayed value of the precision pressure gauge on the IN2 side of the air lock valve. According to the pressure used by the on-site actuator, determine the switching point pressure of the air lock valve. Usually, the pressure is set to 0.3MPa. If the pressure is less than 0.3MPa, the precision pressure gauge on the OUT2 side of the air lock valve already has pressure and the displayed value is 0.50MPa, then it is necessary Increase the pressure switching point of the air lock valve, adjust the pressure on the SIG side of the air lock valve to 0.3MPa, open the exhaust outlet of the three-way valve, and slowly increase the pressure switching point by adjusting the pressure adjusting screw of the air lock valve. If there is pressure, continue to repeat the above steps until there is no pressure in the exhaust; if the pressure is greater than 0.3MPa, the pressure display value of the precision pressure gauge on the OUT2 side of the air lock valve is only 0.50MPa, and it is necessary to reduce the pressure switching point of the air lock valve, adjust the pressure on the SIG side of the air lock valve to 0.3MPa, open the exhaust outlet of the three-way valve, and slowly reduce the pressure switching point by adjusting the pressure adjusting screw of the air lock valve. If there is no pressure, continue to repeat the above steps until there is pressure in the exhaust, close the exhaust outlet of the three-way valve, and check the display value of the precision pressure gauge on the OUT2 side of the air lock valve, which should be around 0.50MPa. Increase the pressure on the input side by adjusting the filter pressure reducing valve on the input side of the gas lock valve SIG until the pressure reaches 0.50MPa, open the exhaust outlet of the three-way valve, and then reduce the pressure on the IN2 side of the gas lock valve until there is pressure on the exhaust side and it is close to 0.50MPa. Note the pressure of the switching point at this time. Repeat the above process two or three times to obtain the first pressure switching point.

[0050] Close the two-way ball valve 2 on the main pipeline, observe the displayed value of the precision pressure gauge on the air inlet side of the gas lock valve IN1, and perform the following operations when the pressure is zero: remove the branch pipeline with a two-way ball valve from the quick connector at the gas lock valve IN2 and connect it to the quick connector at the gas lock valve IN1. At the same time, remove the pipeline connected to the three-way ball valve from the quick connector at the gas lock valve OUT2 and connect it to the quick connector at the gas lock valve OUT2; close the exhaust outlet of the three-way ball valve, adjust the pressure of the filter pressure reducing valve on the gas lock valve SIG side to zero, open the gas source control ball valve on the main pipeline, adjust the filter pressure reducing valve to make the pressure at the inlet of the gas lock valve IN1 to 0.50MPa, open the gas line control ball valve on the gas lock valve SIG side, slowly increase the pressure of the filter pressure reducing valve and observe the displayed value of the precision pressure gauge on the gas lock valve OUT1 side. If the displayed value of the precision pressure gauge b on the gas lock valve OUT1 side suddenly increases from zero at a certain moment and approaches 0.50MPa, then write down the displayed value of the precision pressure gauge on the inlet of the gas lock valve IN1 side, and adjust the pressure of the filter pressure reducing valve according to the pressure used by the on-site actuator. Force is used to determine the switching point pressure of the gas lock valve. The pressure is usually set to 0.3MPa. If the pressure is less than 0.3MPa, the precision pressure gauge on the OUT1 side of the gas lock valve already has pressure and the displayed value is 0.50MPa, then it is necessary to increase the pressure switching point of the gas lock valve, adjust the pressure on the SIG side of the gas lock valve to 0.3MPa, open the exhaust outlet of the three-way valve, and slowly increase the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve. If there is pressure, continue to repeat the above steps until there is no pressure when the exhaust is emptied; if the pressure is greater than 0.3MPa, the precision pressure gauge on the OUT1 side of the gas lock valve has a pressure display value of about 0.50MPa, then it is necessary to reduce the pressure switching point of the gas lock valve, adjust the pressure on the SIG side of the gas lock valve to 0.3MPa, open the exhaust outlet of the three-way valve, and slowly reduce the pressure switching point by adjusting the pressure adjusting screw of the gas lock valve. If there is no pressure, continue to repeat the above steps until there is pressure when the exhaust is emptied, close the exhaust valve, and check the displayed value of the precision pressure gauge on the OUT1 side of the gas lock valve, which should be about 0.50MPa. Increase the pressure on the input side by adjusting the filter pressure reducing valve on the input side of the gas lock valve SIG until the pressure is 0.50MPa, open the exhaust outlet of the three-way valve, and then reduce the pressure on the IN1 side of the gas lock valve until there is pressure on the exhaust side and it is close to 0.50MPa. Note the pressure of the switching point at this time to obtain the second pressure switching point. Compare the two recorded pressure values. If they are approximately equal, this pressure value is the pressure value of the gas lock valve switching point.

[0051] During on-site online calibration, use this device to Figure 1 The three-way pneumatic quick connector 7 connecting the two branch pipelines is directly connected to the on-site gas source pipeline, and the calibration process is carried out according to the above.

[0052] The above description is only a preferred embodiment of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for calibrating and setting the gas lock valve in a three-break self-locking device, characterized in that: The invention comprises a calibration gas source (1) and an air lock valve (6). The calibration gas source (1) is connected to a main pipeline, the main pipeline is connected to a two-way valve (2), the end of the main pipeline is connected to a three-way pneumatic quick connector (7) through a core plug (3), two branch pipelines are connected to the three-way pneumatic quick connector (7), both branch pipelines are provided with a filter pressure reducing valve (4) and a pressure gauge (5) in sequence, one of the branch pipelines is connected to a two-way valve (2) through a core plug (3), the end of the branch pipeline provided with the two-way valve (2) is connected to the air lock valve (6) through a two-way pneumatic quick connector (8). The end of the other branch pipeline is connected to the gas input port IN1 of the gas lock valve (6) through a two-way pneumatic quick connector (8); the gas output port OUT1 of the gas lock valve (6) is connected to a pipeline through a two-way pneumatic quick connector (8); a three-way valve (9) is provided at the outlet of the pipeline; two outlets of the three-way valve (9) are respectively connected to an emptying box (10) and a pressure gauge b (11); and the gas input port IN2 and the gas output port OUT2 of the gas lock valve (6) are both provided with two-way pneumatic quick connectors (8); The pressure gauge a (5) is connected to the branch line via a three-way pneumatic quick connector (7) and a bushing (3); a two-way valve (2) is provided between the pressure gauge a (5) and the branch line; the filter pressure reducing valve (4) is connected to the branch line via a two-way pneumatic quick connector (8); The two-way valve (2) is a DN15 stainless steel internal threaded two-way ball valve, and the three-way valve (9) is a DN15 stainless steel internal threaded three-way ball valve.

2. The device for calibrating and setting the gas lock valve in a three-break self-locking device according to claim 1, characterized in that: The filter pressure reducing valve (4) is an ARF4000 pressure regulating filter.

3. The device for calibrating and setting the gas lock valve in a three-break self-locking device according to claim 1 is characterized in that: The bushing (3) is a G1 / 2 external to G1 / 4 internal bushing, and the main pipeline, branch pipeline and pipeline are all PE8*5mm pneumatic hoses.

4. The device for calibrating and setting the gas lock valve in a three-break self-locking device according to claim 1, characterized in that: The pressure gauge a (5) and the pressure gauge b (11) are both precision pressure gauges of model YB-150A with an accuracy of 0.

4.

5. The device for calibrating and setting the gas lock valve in a three-break self-locking device according to claim 1, characterized in that: The two-way pneumatic quick connector (8) is a PL8-02 / L type pneumatic quick-insert external thread elbow, and the three-way pneumatic quick connector (7) is a PB8-02 / T type three-way positive thread pneumatic quick connector.

6. The device for calibrating and setting the gas lock valve in a three-break self-locking device according to claim 1, characterized in that: The air lock valve (6) is a YT-400 double-acting air lock valve.

7. The calibration setting method of the device for calibrating and setting the gas lock valve in the three-break self-locking according to any one of claims 1 to 6, characterized in that The following steps are involved: Step 1: When the pressure at the SIG port of the air pressure control end of the air lock valve (6) is 0, close the connection port between the three-way valve (9) and the evacuation box (10), open the two-way valve (2) at the calibration gas source (1), adjust the filter pressure reducing valve (4) on the inlet side of the gas input end IN1 of the air lock valve (6) so that the inlet pressure of the gas input end IN1 of the air lock valve (6) is 0.55 MPa, and observe the displayed value of the pressure gauge b (11). When the inlet pressure of the gas input end IN1 of the air lock valve (6) is maintained at 0.55 MPa, the displayed value of the pressure gauge b (11) is always zero within five minutes, and the sealing performance of the gas input end IN1 side of the air lock valve (6) is intact; Step 2: Close the two-way valve (2) at the calibration gas source (1), observe the displayed value of the pressure gauge a (5) on the air inlet side of the gas input terminal IN1 of the gas lock valve (6), and when the pressure is zero, remove the branch line on the inlet side of the gas input terminal IN1 of the gas lock valve (6) and the two-way pneumatic quick connector (8) at the gas input terminal IN1 of the gas lock valve (6), and then connect the branch line on the inlet side of the gas input terminal IN1 of the gas lock valve (6) to the two-way pneumatic quick connector (8) at the gas input terminal IN2 of the gas lock valve (6), and at the same time remove the outlet pipeline of the gas output terminal OUT1 of the gas lock valve (6) and the two-way pneumatic quick connector (8) at the gas output terminal OUT1 of the gas lock valve (6), and then connect the gas output terminal OUT2 of the gas lock valve (6) to the two-way pneumatic quick connector (8) at the gas output terminal OUT1 of the gas lock valve (6). The outlet pipeline at the outlet end OUT1 is connected to the two-way pneumatic quick connector (8) of the gas output end OUT2 port of the gas lock valve (6). When there is no pressure at the SIG port of the air pressure control end of the gas lock valve (6), open the two-way valve (2) at the calibration gas source (1), adjust the filter pressure reducing valve (4) on the inlet side of the gas input end IN2 of the gas lock valve (6) so that the pressure at the inlet of the gas input end IN2 of the gas lock valve (6) is 0.55 MPa, and observe the displayed value of the pressure gauge b (11). If the pressure at the gas input end IN2 of the gas lock valve (6) is always 0.55 MPa, and the displayed value of the pressure gauge b (11) is always zero within five minutes, then the sealing performance of the gas input end IN2 side of the gas lock valve (6) is intact; Step 3: After the airtightness test of the air lock valve (6) is completed, adjust the filter pressure reducing valve (4) on the gas input end IN2 side of the air lock valve (6) so that the inlet pressure of the gas input end IN2 of the air lock valve (6) is 0.50 MPa, adjust the pressure of the filter pressure reducing valve (4) on the air pressure control end SIG side of the air lock valve (6) to zero, open the two-way valve (2) on the branch line on the air pressure control end SIG side of the air lock valve (6), slowly increase the pressure of the filter pressure reducing valve (4) on the air pressure control end SIG side of the air lock valve (6) and observe the displayed value of the pressure gauge b (11). When the displayed value of the pressure gauge b (11) increases from zero to 0.50 MPa, record the air lock. The displayed value of the pressure gauge a (5) on the gas input terminal IN2 side of the valve (6) is used to determine the switching point pressure of the gas lock valve (6) according to the pressure used by the on-site pneumatic long-stroke actuator. The switching point pressure of the gas lock valve (6) is set to 0.3 MPa. When the pressure on the input side is increased to 0.50 MPa by adjusting the filter pressure reducing valve (4) on the input side of the gas pressure control terminal SIG of the gas lock valve (6), the outlet of the three-way valve (9) connected to the emptying box (10) is opened, and then the pressure on the gas input terminal IN2 side of the gas lock valve (6) is reduced. When the pressure of the pressure gauge b (11) is 0.50 MPa, the pressure value of the switching point at this time is recorded; Step 4: Repeat step 3 two or three times to obtain the first pressure switching point; Step 5: Close the two-way valve (2) at the calibration gas source (1), observe the displayed value of the pressure gauge a (5) on the air inlet side of the gas input terminal IN1 of the gas lock valve (6), and when the pressure is zero, remove the branch line on the air inlet side of the gas input terminal IN2 of the gas lock valve (6) and the two-way pneumatic quick connector (8) at the gas input terminal IN2 port of the gas lock valve (6), and then connect the branch line on the air inlet side of the gas input terminal IN2 of the gas lock valve (6) to the two-way pneumatic quick connector (8) at the gas input terminal IN1 port of the gas lock valve (6), and at the same time remove the pipeline on the gas output terminal OUT2 side of the gas lock valve (6) and the two-way pneumatic quick connector (8) at the gas output terminal OUT2 port, and then connect the pipeline on the gas output terminal OUT2 side of the gas lock valve (6) to the two-way pneumatic quick connector (8) at the gas output terminal OUT1 port, close the outlet of the three-way valve (9) connected to the emptying box (10), and connect the gas pressure control terminal SI of the gas lock valve (6). Adjust the pressure of the filter pressure reducing valve (4) on the G side to zero, open the two-way valve (2) at the calibration gas source (1), adjust the filter pressure reducing valve (4) on the gas pressure control end SIG side of the gas lock valve (6) so that the pressure at the inlet of the gas input end I N1 of the gas lock valve (6) is 0.50 MPa, open the two-way valve on the branch line on the SIG side of the gas pressure control end of the gas lock valve (6), slowly increase the pressure of the filter pressure reducing valve on the SIG side of the gas pressure control end of the gas lock valve (6) and observe the displayed value of the pressure gauge b (11). If the displayed value of the pressure gauge b (11) increases from zero to 0.50 MPa, record the pressure at the gas input end I N1 of the gas lock valve (6). The displayed value of the inlet pressure gauge a (5) on the N1 side is used to determine the switching point pressure of the air lock valve (6) according to the pressure used by the on-site pneumatic long-stroke actuator. The switching point pressure of the air lock valve (6) is set to 0.3 MPa. By adjusting the filter pressure reducing valve (4) on the input side of the air pressure control end SIG of the air lock valve (6), the pressure on the input side is increased to 0.50 MPa. Then, the outlet of the three-way valve (9) connected to the drain box (10) is opened, and then the pressure on the gas input end IN1 side of the air lock valve (6) is reduced until the pressure of the pressure gauge b (11) is 0.50 MPa. The pressure value of the switching point at this time is recorded to obtain the second pressure switching point. Step 6: Compare the pressure value of the first pressure switching point recorded in step 4 with the pressure value of the second pressure switching point recorded in step 5. When the two are equal, the pressure value of the first pressure switching point or the pressure value of the second pressure switching point is the pressure value of the air lock valve switching point.

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