Multifunctional verification device and method for breather valve

Abstract

The invention provides a multifunctional verification device and method for a breather valve, and relates to the technical field of breather valve verification devices. The multifunctional check device for the breather valve comprises a mounting box and a breather valve body, a first mounting cavity is formed in the lower portion of the outer wall of the front end of the mounting box, a second mounting cavity is formed in the middle of the upper surface of the mounting box, and a touch panel is arranged on the upper portion of the outer wall of the front end of the mounting box; three connecting plates are fixedly connected to the upper end of the inner wall of the second mounting cavity, and supporting discs are fixedly connected to the outer sides of the sides, close to the center of the mounting box, of the connecting plates correspondingly. The internal air pressure of the air storage cylinder is changed and the air pressure value of the air storage cylinder and the exhaust pipe is measured, so that the air pressure difference value of the breather valve is measured and verified, and the verification accuracy of the breather valve is improved to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing valve calibration devices, and particularly to a multifunctional breathing valve calibration device and method. Background Technique

[0002] A breathing valve is a valve used to regulate pressure and is widely applied in various container and pipeline systems. The main function of the breathing valve is to allow the container or system to breathe when the internal pressure is too high or too low, so as to maintain the stability of the internal pressure. A breathing valve calibration device is a device used to detect and calibrate the performance of the breathing valve to ensure that the breathing valve can work properly in industrial production.

[0003] However, the existing breathing valve calibration devices only use a negative pressure pump and a pressure sensor in cooperation to measure the pipeline of the breathing valve during measurement. This method may cause relatively large errors and affect the accuracy of breathing valve calibration. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a multifunctional breathing valve calibration device and method, which solve the problem that the existing breathing valve calibration devices only use a negative pressure pump and a pressure sensor in cooperation to measure the pipeline of the breathing valve, and this method may cause relatively large errors and affect the accuracy of breathing valve calibration.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A multifunctional breathing valve calibration device includes an installation box and a breathing valve body. A first installation cavity is opened at the lower part of the front outer wall of the installation box, a second installation cavity is opened in the middle of the upper surface of the installation box, a touch panel is arranged on the upper part of the front outer wall of the installation box, three connecting plates are fixedly connected to the upper end of the inner wall of the second installation cavity, support disks are fixedly connected to the outer sides of the connecting plates close to the center of the installation box, a measuring cylinder is fixedly connected to the middle of the upper surface of the support disk, a mounting seat is fixedly connected to one side of the inner bottom surface of the first installation cavity, an air storage cylinder is fixedly connected to the middle of the upper surface of the mounting seat, an exhaust pipe is connected through the other side of the front outer wall of the air storage cylinder, a pressure gauge is connected through the middle of the outer wall of the exhaust pipe, and a second electromagnetic control valve is arranged inside the exhaust pipe;

[0008] On the other side of the inner bottom surface of the first installation cavity, an air pump is fixedly connected by a plurality of bolts. The air inlet at the lower end of the breathing valve body is snap-connected to the measuring cylinder. In the middle of the inner bottom surface of the second installation cavity, a hydraulic telescopic rod is fixedly connected. The upper end of the hydraulic telescopic rod is fixedly connected with an adjusting disc. Three adjusting plates are evenly and fixedly connected to the outer wall of the adjusting disc. The output shaft of the hydraulic telescopic rod penetrates through the adjusting disc to the outside of the adjusting disc and is fixedly connected with a movable disc. Three movable plates are evenly and fixedly connected to the outer wall of the movable disc. One side of each movable plate away from the center of the installation box is respectively hinged with a fixed rod, and the upper ends of the fixed rods are closely attached to the outer wall of the breathing valve body;

[0009] Through the above technical solution, through the coordinated use of the hydraulic telescopic rod, the fixed rod and the measuring cylinder, it is convenient for the staff to quickly install and disassemble the breathing valve body, and the airtightness of the air inlet of the breathing valve body is maintained, improving the accuracy of the detection results.

[0010] Preferably, middle parts of the outer walls on both sides of each adjusting plate are respectively provided with sliding grooves. Both sides of the outer wall of the lower end of each fixed rod are respectively fixedly connected with sliding rods, and the sliding rods respectively slide inside the sliding grooves;

[0011] Through the above technical solution, the moving direction of the sliding rod is restricted by the sliding groove, so that the fixed rod rotates around the movable plate, and then the fixed rod can fix the breathing valve body.

[0012] Preferably, a sealing groove is provided in the middle of the upper surface of the measuring cylinder, and the sealing ring at the air inlet at the lower end of the breathing valve body is snap-connected to the sealing groove;

[0013] Through the above technical solution, the airtightness of the breathing valve body is improved through the sealing groove.

[0014] Preferably, the exhaust port of the air pump is connected through a connecting pipe. An electromagnetic control valve I is arranged inside the pipe body of the connecting pipe, and the upper end of the connecting pipe is connected through the outer wall at the rear end of the air storage cylinder;

[0015] Through the above technical solution, the fluidity of the connecting pipe can be changed through the electromagnetic control valve I, and the measuring air is injected into the air storage cylinder through the air pump.

[0016] Preferably, the upper end of the exhaust pipe sequentially penetrates through the first installation cavity to the inside of the second installation cavity and is connected through the measuring cylinder;

[0017] Through the above technical solution, the air inside the air storage cylinder is transmitted to the inside of the measuring cylinder through the exhaust pipe.

[0018] Preferably, a pressure relief valve is connected through one side of the front outer wall of the air storage cylinder. The middle of the front outer wall of the first installation cavity is fixedly connected by a plurality of bolts with a grid plate;

[0019] Through the above technical solution, the air flow inside the first installation cavity is maintained by the grid plate, and the air pressure inside the air storage cylinder is maintained below the preset air pressure value M4 by the pressure relief valve. When the air pressure value inside the air storage cylinder exceeds M4, it will open automatically and discharge the gas inside the air storage cylinder.

[0020] Preferably, the usage method of the breathing valve multifunctional calibration device includes the following steps:

[0021] S1: Clamp the air inlet at the lower end of the breathing valve body to the upper end of the measuring cylinder, and make the sealing ring at the air inlet at the lower end of the breathing valve body be clamped inside the sealing groove;

[0022] S2: Start the hydraulic telescopic rod through the touch panel, so that the output shaft of the hydraulic telescopic rod drives the movable disk to move, thereby making the slide bar arranged on the fixed rod move inside the sliding groove opened on the adjusting plate, and then making the upper end of the fixed rod closely fit the outer wall of the breathing valve body to prevent the breathing valve body from moving, thus ensuring the sealing performance during the measurement of the breathing valve body;

[0023] S3: Close the first electromagnetic control valve through the touch panel, open the second electromagnetic control valve, and measure the initial air pressure value M1 inside the exhaust pipe at this time through the pressure gauge, and transmit this value to the touch panel;

[0024] S4: Start the air pump through the touch panel, at the same time open the first electromagnetic control valve through the touch panel, close the second electromagnetic control valve, and measure the secondary air pressure value M2 inside the exhaust pipe at this time through the pressure gauge, and transmit this value to the touch panel;

[0025] S5: When it is observed that the pressure relief valve starts to work in advance, close the first electromagnetic control valve through the touch panel, open the second electromagnetic control valve, measure the tertiary air pressure value M3 inside the exhaust pipe at this time through the pressure gauge, transmit this value to the touch panel, and record the preset air pressure value M4 of the pressure relief valve;

[0026] S6: Calculate that the initial air pressure value when the exhaust pipe is empty is / 2, and the air pressure value when the exhaust pipe is filled with gas is M3 - M4;

[0027] S7: Subtract the air pressures inside the two exhaust pipes to obtain the air pressure change difference of the breathing valve body as M3 - M4 - / 2. Compare this value with the differential pressure value marked on the factory nameplate of the breathing valve body to complete the calibration of the breathing valve body.

[0028] (III) Beneficial effects

[0029] The present invention provides a breathing valve multifunctional calibration device and method. It has the following beneficial effects:

[0030] 1. The present invention provides a multifunctional breathing valve calibration device and method, which measures the air pressure value inside the exhaust pipe multiple times, and changes the air pressure inside the air storage cylinder and measures the air pressure value between the air pressure inside the air storage cylinder and the exhaust pipe through the coordinated use of an air pump, a No. 1 electromagnetic control valve and a No. 2 electromagnetic control valve, thereby achieving measurement and calibration of the air pressure difference value of the breathing valve, and improving the accuracy of the breathing valve calibration to a certain extent.

[0031] 2. The present invention provides a multifunctional breathing valve calibration device and method. Through the coordinated use of a hydraulic telescopic rod, a fixed rod and a measuring tube, it is convenient for workers to quickly install and disassemble the breathing valve body, and maintains the sealing of the air inlet of the breathing valve body, thereby improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the main structure of the present invention from a first viewing angle;

[0033] Figure 2 is a schematic diagram of the main structure of the present invention from a second viewing angle;

[0034] Figure 3 It is an axial exploded view of the present invention;

[0035] Figure 4 An exploded view of a local structure of the present invention;

[0036] Figure 5 for Figure 3 The enlarged view of point A in the middle;

[0037] Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0038] in,

[0039] 1. Installation box; 2. Installation cavity No. 1; 3. Grid plate; 4. Installation cavity No. 2; 5. Touch panel; 6. Mounting seat; 7. Air cylinder; 8. Pressure relief valve; 9. Air pump; 10. Inlet pipe; 11. Solenoid control valve No. 1; 12. Exhaust pipe; 13. Solenoid control valve No. 2; 14. Pressure gauge; 15. Connecting plate; 16. Support plate; 17. Measuring cylinder; 18. Hydraulic telescopic rod; 19. Adjusting plate; 20. Adjusting plate; 21. Slide groove; 22. Movable plate; 23. Movable plate; 24. Fixed rod; 25. Sliding rod; 26. Sealing groove; 27. Breathing valve body. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figures 1-6 shown, an embodiment of the present invention provides a multifunctional breathing valve calibration device, including an installation box 1 and a breathing valve body 27. A first installation cavity 2 is opened at the lower part of the front outer wall of the installation box 1, a second installation cavity 4 is opened in the middle of the upper surface of the installation box 1, a touch panel 5 is arranged at the upper part of the front outer wall of the installation box 1, three connecting plates 15 are fixedly connected to the upper end of the inner wall of the second installation cavity 4, a support disk 16 is fixedly connected to the outer side of each connecting plate 15 close to the center of the installation box 1, a measuring cylinder 17 is fixedly connected to the middle of the upper surface of the support disk 16, a mounting seat 6 is fixedly connected to one side of the inner bottom surface of the first installation cavity 2, an air storage cylinder 7 is fixedly connected to the middle of the upper surface of the mounting seat 6, a exhaust pipe 12 is connected through the other side of the front outer wall of the air storage cylinder 7, a pressure gauge 14 is connected through the middle of the outer wall of the pipe body of the exhaust pipe 12, and a second electromagnetic control valve 13 is arranged inside the pipe body of the exhaust pipe 12;

[0042] A gas pump 9 is fixedly connected to the other side of the inner bottom surface of the first installation cavity 2 through a plurality of bolts. The air inlet at the lower end of the breathing valve body 27 is clamped and connected with the measuring cylinder 17. A hydraulic telescopic rod 18 is fixedly connected to the middle of the inner bottom surface of the second installation cavity 4. The upper end of the hydraulic telescopic rod 18 is fixedly connected with an adjusting disk 19. Three adjusting plates 20 are evenly fixedly connected to the outer wall of the adjusting disk 19. The output shaft of the hydraulic telescopic rod 18 penetrates through the adjusting disk 19 to the outside of the adjusting disk 19 and is fixedly connected with a movable disk 22. Three movable plates 23 are evenly fixedly connected to the outer wall of the movable disk 22. One side of each movable plate 23 far from the center of the installation box 1 is respectively hinged with a fixed rod 24, and the upper ends of the fixed rods 24 are closely attached to the outer wall of the breathing valve body 27;

[0043] Through the combined use of the hydraulic telescopic rod 18, the fixed rod 24 and the measuring cylinder 17, it is convenient for the staff to quickly install and disassemble the breathing valve body 27, and the airtightness of the air inlet of the breathing valve body 27 is maintained, improving the accuracy of the detection result.

[0044] Chute 21 is respectively opened at the middle of the outer walls on both sides of the adjusting plate 20. Slide bars 25 are respectively fixedly connected to both sides of the outer wall at the lower end of the fixed rod 24. The slide bars 25 slide inside the chute 21 respectively;

[0045] The moving direction of the sliding rod 25 is restricted by the sliding groove 21, so that the fixed rod 24 rotates around the movable plate 23, and further the fixed rod 24 can fix the breathing valve body 27.

[0046] A sealing groove 26 is provided in the middle of the upper surface of the measuring cylinder 17, and the sealing ring at the lower air inlet of the breathing valve body 27 is snap-connected to the sealing groove 26;

[0047] The sealing performance of the breathing valve body 27 is improved through the sealing groove 26.

[0048] The exhaust port of the air pump 9 is connected through a connecting pipe 10, and a first electromagnetic control valve 11 is arranged inside the pipe body of the connecting pipe 10. The upper end of the connecting pipe 10 is connected through the outer wall of the rear end of the air storage cylinder 7;

[0049] The fluidity of the connecting pipe 10 can be changed through the first electromagnetic control valve 11, and the measuring air is injected into the air storage cylinder 7 through the air pump 9.

[0050] The upper end of the exhaust pipe 12 sequentially penetrates through the inside of the first installation cavity 2 to the second installation cavity 4 and is connected through the measuring cylinder 17;

[0051] The air inside the air storage cylinder 7 is transmitted to the inside of the measuring cylinder 17 through the exhaust pipe 12.

[0052] One side of the front outer wall of the air storage cylinder 7 is connected through a pressure relief valve 8, and the middle of the front outer wall of the first installation cavity 2 is fixedly connected through a plurality of bolts with a grid plate 3;

[0053] The air inside the first installation cavity 2 is kept flowing through the grid plate 3, and the air pressure inside the air storage cylinder 7 is kept below its preset air pressure value M4 through the pressure relief valve 8, and when the air pressure value inside the air storage cylinder 7 exceeds M4, it will open automatically and discharge the gas inside the air storage cylinder 7.

[0054] The usage method of this breathing valve multifunctional calibration device includes the following steps:

[0055] S1: The air inlet at the lower end of the breathing valve body 27 is snap-connected to the upper end of the measuring cylinder 17, and the sealing ring at the lower air inlet of the breathing valve body 27 is snap-connected to the inside of the sealing groove 26;

[0056] S2: The hydraulic telescopic rod 18 is started through the touch panel 5, so that the output shaft of the hydraulic telescopic rod 18 drives the movable disk 22 to move, so that the sliding rod 25 arranged on the fixed rod 24 moves inside the sliding groove 21 opened on the adjusting plate 20, and further the upper end of the fixed rod 24 closely fits the outer wall of the breathing valve body 27, preventing the breathing valve body 27 from moving, thus ensuring the sealing performance during the measurement of the breathing valve body 27.

[0057] S3: closing the first electromagnetic control valve 11 through the touch panel 5, opening the second electromagnetic control valve 13, and measuring the initial value M1 of the air pressure inside the exhaust pipe 12 through the barometer 14, and transmitting this value to the touch panel 5;

[0058] S4: Start the air pump 9 through the touch panel 5, and at the same time, open the first electromagnetic control valve 11 through the touch panel 5, close the second electromagnetic control valve 13, and measure the secondary value M2 of the air pressure inside the exhaust pipe 12 through the barometer 14, and transmit this value to the touch panel 5;

[0059] S5: When it is observed that the pressure relief valve 8 starts to work in advance, the first electromagnetic control valve 11 is closed through the touch panel 5, and the second electromagnetic control valve 13 is opened. At this time, the pressure value M3 of the air pressure inside the exhaust pipe 12 is measured by the barometer 14, and the value is transmitted to the touch panel 5, and the pressure value M4 preset by the pressure relief valve is recorded;

[0060] S6: Calculate that the initial value of the air pressure inside the exhaust pipe 12 when it is empty is M1+M2 / 2, and the air pressure value inside the exhaust pipe 12 when it is full of gas is M3-M4;

[0061] S7: By taking the difference in the air pressure inside the exhaust pipes 12 on both sides, the difference in air pressure change of the breathing valve body 27 can be obtained as M3-M4-M1+M2 / 2. This value can be compared with the pressure difference value indicated on the factory nameplate of the breathing valve body 27 to complete the calibration of the breathing valve body 27.

[0062] Working principle: When using this multifunctional breathing valve calibration device, first, the air inlet at the lower end of the breathing valve body 27 is clamped to the upper end of the measuring cylinder 17, and the sealing ring at the air inlet at the lower end of the breathing valve body 27 is clamped inside the sealing groove 26. Secondly, the hydraulic telescopic rod 18 is started through the touch panel 5, and the output shaft of the hydraulic telescopic rod 18 drives the movable disk 22 to move, so that the sliding rod 25 provided on the fixed rod 24 moves inside the sliding groove 21 opened on the adjusting plate 20, and then the upper end of the fixed rod 24 closely fits the outer wall of the breathing valve body 27 to prevent the breathing valve body 27 from moving, thus ensuring the sealing performance during the measurement of the breathing valve body 27. Thirdly, the first electromagnetic control valve 11 is closed through the touch panel 5, the second electromagnetic control valve 13 is opened, and the initial air pressure value M1 inside the exhaust pipe 12 at this time is measured through the pressure gauge 14, and this value is transmitted to the touch panel 5. Subsequently, the air pump 9 is started through the touch panel 5, and at the same time the first electromagnetic control valve 11 is opened through the touch panel 5, the second electromagnetic control valve 13 is closed, and the secondary air pressure value M2 inside the exhaust pipe 12 at this time is measured through the pressure gauge 14, and this value is transmitted to the touch panel 5. Then, when it is observed that the pressure relief valve 8 starts to work in advance, the first electromagnetic control valve 11 is closed through the touch panel 5, the second electromagnetic control valve 13 is opened, and at this time the tertiary air pressure value M3 inside the exhaust pipe 12 is measured through the pressure gauge 14, and this value is transmitted to the touch panel 5, and the pre-set air pressure value M4 of the pressure relief valve is recorded. Finally, it is calculated that the initial air pressure value of the exhaust pipe 12 when it is empty is M1 + M2 / 2, the air pressure value when the exhaust pipe 12 is filled with gas is M3 - M4, and then the difference between the air pressures inside the two exhaust pipes 12 is taken to obtain the air pressure change difference of the breathing valve body 27 as M3 - M4 - M1 + M2 / 2. Comparing this value with the differential pressure value marked on the factory nameplate of the breathing valve body 27 can complete the calibration of the breathing valve body 27.

[0063] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional calibration device for a breathing valve, comprising an installation box (1) and a breathing valve body (27), characterized in that: A first installation cavity (2) is provided in the lower part of the outer wall at the front end of the installation box (1), a second installation cavity (4) is provided in the middle of the upper surface of the installation box (1), a touch panel (5) is provided on the upper part of the outer wall at the front end of the installation box (1), three connecting plates (15) are fixedly connected to the upper end of the inner wall of the second installation cavity (4), a support plate (16) is fixedly connected to the outer side of each connecting plate (15) close to the center of the installation box (1), a measuring cylinder (17) is fixedly connected to the middle of the upper surface of the support plate (16), a mounting seat (6) is fixedly connected to one side of the inner bottom surface of the first installation cavity (2), an air storage cylinder (7) is fixedly connected to the middle of the upper surface of the mounting seat (6), an exhaust pipe (12) is connected through the other side of the outer wall at the front end of the air storage cylinder (7), a pressure gauge (14) is connected through the middle of the outer wall of the exhaust pipe (12), and a second electromagnetic control valve (13) is provided inside the exhaust pipe (12); An air pump (9) is fixedly connected to the other side of the inner bottom surface of the first installation cavity (2) through a plurality of bolts, the air inlet at the lower end of the breathing valve body (27) is connected to the measuring cylinder (17) in a clamping manner, a hydraulic telescopic rod (18) is fixedly connected to the middle of the inner bottom surface of the second installation cavity (4), the upper end of the hydraulic telescopic rod (18) is fixedly connected to an adjusting plate (19), three adjusting plates (20) are fixedly connected to the outer wall of the adjusting plate (19) evenly, the output shaft of the hydraulic telescopic rod (18) penetrates through the adjusting plate (19) to the outside of the adjusting plate (19) and is fixedly connected to a movable plate (22), three movable plates (23) are fixedly connected to the outer wall of the movable plate (22) evenly, a fixing rod (24) is hinged to the outer side of each movable plate (23) away from the center of the installation box (1), and the upper ends of the fixing rods (24) are closely attached to the outer wall of the breathing valve body (27).

2. The multifunctional calibration device for a breathing valve according to claim 1, characterized in that: Sliding grooves (21) are respectively provided in the middle of the outer walls on both sides of the adjusting plate (20), sliding rods (25) are respectively fixedly connected to both sides of the outer wall at the lower end of the fixing rod (24), and the sliding rods (25) slide inside the sliding grooves (21) respectively.

3. The multifunctional calibration device for a breathing valve according to claim 1, characterized in that: A sealing groove (26) is provided in the middle of the upper surface of the measuring cylinder (17), and the sealing ring at the air inlet at the lower end of the breathing valve body (27) is connected to the sealing groove (26) in a clamping manner.

4. A multifunctional calibration device for a breathing valve according to claim 1, characterized in that: The air outlet of the air pump (9) is connected through an air inlet pipe (10), a first electromagnetic control valve (11) is provided inside the air inlet pipe (10), and the upper end of the air inlet pipe (10) is connected through the outer wall at the rear end of the air storage cylinder (7).

5. A multifunctional calibration device for a breathing valve according to claim 1, characterized in that: The upper end of the exhaust pipe (12) penetrates through the first installation cavity (2) to the inside of the second installation cavity (4) in sequence and is connected to the measuring cylinder (17) through.

6. The multifunctional calibration device for a breathing valve according to claim 1, wherein: A pressure relief valve (8) is connected through one side of the outer wall at the front end of the air storage cylinder (7), and a grid plate (3) is fixedly connected to the middle of the outer wall at the front end of the first installation cavity (2) through a plurality of bolts.

7. The usage method of a multifunctional calibration device for a breathing valve according to claim 1, characterized in that: Comprising the following steps: S1: clamping the air inlet at the lower end of the breathing valve body (27) to the upper end of the measuring tube (17), and clamping the sealing ring at the air inlet at the lower end of the breathing valve body (27) to the inside of the sealing groove (26); S2: The hydraulic telescopic rod (18) is activated through the touch panel (5), so that the output shaft of the hydraulic telescopic rod (18) drives the movable plate (22) to move, thereby causing the sliding rod (25) provided on the fixed rod (24) to move inside the sliding groove (21) provided on the adjustment plate (20), thereby causing the upper end of the fixed rod (24) to fit tightly against the outer wall of the breathing valve body (27), preventing the breathing valve body (27) from moving, thereby ensuring the sealing of the breathing valve body (27) during measurement; S3: The first electromagnetic control valve (11) is closed through the touch panel (5), the second electromagnetic control valve (13) is opened, and the initial value M1 of the air pressure inside the exhaust pipe (12) is measured through the pressure gauge (14), and the value is transmitted to the touch panel (5); S4: Start the air pump (9) through the touch panel (5), open the first electromagnetic control valve (11) through the touch panel (5), close the second electromagnetic control valve (13), and measure the secondary value M2 of the air pressure inside the exhaust pipe (12) through the pressure gauge (14), and transmit this value to the touch panel (5); S5: When it is observed that the pressure relief valve (8) starts to work in advance, the first electromagnetic control valve (11) is closed through the touch panel (5), and the second electromagnetic control valve (13) is opened. At this time, the pressure value M3 of the air pressure inside the exhaust pipe (12) is measured by the pressure gauge (14), and the value is transmitted to the touch panel (5), and the pressure value M4 preset by the pressure relief valve is recorded; S6: It is calculated that the initial value of the air pressure inside the exhaust pipe (12) when it is empty is (M1+M2) / 2, and the air pressure value inside the exhaust pipe (12) when it is full of gas is M3-M4; S7: By taking the difference of the air pressure inside the exhaust pipes (12) on both sides, the difference in air pressure change of the breathing valve body (27) can be obtained as M3-M4-(M1+M2) / 2. This value is compared with the pressure difference value indicated on the factory nameplate of the breathing valve body (27), and the breathing valve body (27) can be calibrated.

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