A breathing valve testing device and a breathing valve testing method

Abstract

The present invention relates to a test device for a breathing valve and a test method thereof, comprising an operating table, which is a box structure, a control panel is arranged on the outside of the operating table, and an air pressure system is arranged on the inside; and a test table, which is a tank structure, a transfer flange is arranged on the upper end of the test table, a test inlet and a pressure gauge interface are arranged on the side, a fixture assembly is arranged on the periphery of the transfer flange, the test inlet is connected to the air pressure system, and a U-shaped pressure gauge is connected to the pressure gauge interface. It also includes a test device for a breathing valve for testing, including the following steps: S1. Assembling the test device; S2. Installing the breathing valve; S3. Testing the breathing valve; S4. Disassembling the test device. The test device for the breathing valve only needs to control the test on the control panel, which is more convenient and simple to operate; the positive / negative pressure data of the opening of the breathing valve can also be accurately obtained by using the U-shaped pressure gauge, which has the advantages of low cost and good practicality.

Description

Technical Field

[0001] The invention relates to the field of valve testing, and in particular to a testing device and a testing method for a breathing valve. Background Art

[0002] A breathing valve is a valve that not only ensures that the storage tank space is isolated from the atmosphere within a certain pressure range, but can also communicate with the atmosphere (breathe) when the pressure exceeds or falls below this range. Its function is to prevent the storage tank from being damaged due to overpressure or vacuum, and at the same time reduce the evaporation loss of the stored liquid.

[0003] The breathing valve needs to be tested for tightness before leaving the factory, which mainly includes positive / negative pressure opening pressure, valve body air tightness and other tests. At present, for small breathing valves, the existing testing devices are expensive and complicated to operate, which results in low testing efficiency and difficulty in controlling the test accuracy. To this end, we have developed a low-cost and easy-to-use breathing valve testing device. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, a test device and a test method for a breathing valve are provided.

[0005] In order to achieve the above technical effect, the technical solution adopted by the present invention is: a breathing valve testing device, comprising:

[0006] An operating table, which is a box structure, with a control panel disposed on the outside and a pneumatic system disposed on the inside; and

[0007] The test bench is a tank structure, with an adapter flange at the upper end, a test inlet and a pressure gauge interface at the side, a fixture assembly at the periphery of the adapter flange, the test inlet is connected to the air pressure system, and the pressure gauge interface is connected to a U-shaped pressure gauge.

[0008] Furthermore, two pressure gauges are arranged above the control panel, and the control panel includes a vacuum pump switch, a pressure pump switch, a negative pressure test switch, a positive pressure test switch and a pressure relief switch, and the negative pressure test switch and the positive pressure test switch correspond to the two pressure gauges respectively.

[0009] Furthermore, the pneumatic system includes an electrical control box, a vacuum pump pipeline and a pressure pump pipeline, and the side wall of the operating table is provided with a power interface for docking the electrical control box, and a test outlet for docking the vacuum pump pipeline and the pressure pump pipeline.

[0010] Furthermore, there are a plurality of the fixture assemblies, which are evenly distributed circumferentially on the outer circumference of the adapter flange, and a plurality of support frames are evenly distributed circumferentially inside the test bench, and each of the support frames is arranged below the corresponding fixture assembly.

[0011] Furthermore, the fixture assembly includes a slide rail fixedly arranged on the upper end of the test bench, a slide seat slidably arranged on the slide rail, and a quick clamp fixedly arranged above the slide seat. The length direction of the slide rail is perpendicular to and intersects with the axial direction of the adapter flange, and a stop plate is arranged at one end of the slide rail away from the adapter flange.

[0012] Furthermore, a sealing groove is provided at the upper end of the adapter flange, and a sealing ring is installed in the sealing groove.

[0013] Furthermore, the inner wall of the adapter flange is provided with axially distributed strip holes, a lever is inserted into the inside of the strip holes, the middle part of the lever is rotatably connected to the strip holes through a rotating shaft, the bottom of the sealing groove is provided with a through hole connected to the strip hole, and a top block connected to the lever is provided in the through hole; in the absence of external force, the top block is located below the bottom of the sealing groove.

[0014] Furthermore, a Fomar wheel is arranged at the bottom of the test bench, and a plurality of leg assemblies are evenly distributed around the side of the test bench, the leg assemblies include a first adjusting rod, a second adjusting rod and a supporting foot, one end of the first adjusting rod is hinged to the top of the test bench, and the other end is hinged to the supporting foot, one end of the second adjusting rod is hinged to the bottom of the test bench, and the other end is hinged to the middle part of the first adjusting rod, screw holes are arranged at the four corners of the supporting foot, and a rubber pad is arranged under the supporting foot.

[0015] Furthermore, the first adjusting rod and the second adjusting rod have the same structure, and both include an outer tube and an inner tube. A nut seat is provided at one end of the outer tube, and a round nut is rotatably installed in the threaded seat. One end of the inner tube passes through the round nut and then extends into the outer tube, and the inner tube and the round nut thread cooperate.

[0016] The present invention also provides a method for testing a breathing valve, which is performed using the breathing valve testing device described in any one of the above items, and comprises the following steps:

[0017] S1. Test device assembly: Move the operating table and test bench to suitable locations and connect the pneumatic pipelines to form a complete test device;

[0018] S2. Breathing valve installation: Use a crane to hoist the breathing valve to be tested above the test bench, align it to the position and slowly place it on the adapter flange, and then use a clamp assembly to press and fix the two together;

[0019] S3. Breathing valve test: Select the air pressure system through the control panel, connect the breathing valve after obtaining the required air pressure, observe the liquid level change of the U-type pressure gauge and record the corresponding data, and compare the standard data of the breathing valve to determine whether it is qualified;

[0020] S4. Disassembly of the test device: After the test is completed, clean the test device, disconnect the pneumatic pipeline, and then move the operating table and test bench to their original positions.

[0021] Furthermore, in step S1, after the test bench is moved to a suitable position, the leg assembly on the side of the test bench can be lowered to provide anti-tilt support.

[0022] Furthermore, in step S2, the nominal diameter of the breathing valve is 50-500 mm, and the maximum testable pressure of the breathing valve is 0.4 MPa.

[0023] Furthermore, in step S3, when the positive pressure opening pressure of the breathing valve to be tested is reached, the pressure relief switch and the negative pressure test switch are closed, the positive pressure test switch is turned on and the pressure pump switch is pressed to start inflating the test bench, and at the same time, the liquid level change of the U-type pressure gauge is observed until the breathing valve is opened, the pressure pump switch is released, and the data corresponding to the liquid level of the U-type pressure gauge is recorded. After the test is completed, the pressure relief switch is opened to release the pressure.

[0024] Furthermore, in step S3, when the negative pressure opening pressure of the breathing valve to be tested is reached, the pressure relief switch and the positive pressure test switch are closed, the negative pressure test switch is turned on and the vacuum pump switch is pressed to start pumping air in the test bench, and at the same time, the liquid level changes of the U-type pressure gauge are observed until the breathing valve is opened, the vacuum pump switch is released, and the data corresponding to the liquid level of the U-type pressure gauge is recorded. After the test is completed, the pressure relief switch is opened to release the pressure.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The test operation and valve installation are designed separately, which can avoid the complexity caused by integration, and is easy to move and has a more flexible layout;

[0027] 2. Only need to control the test on the control panel, which is more convenient and simple to operate;

[0028] 3. The U-type pressure gauge can also accurately obtain the positive / negative pressure data of the breathing valve opening, which has the advantages of low cost and good practicality;

[0029] 4. The connection between the adapter flange and the breathing valve has good sealing performance, which ensures the reliability of the test results, and the sealing ring at the sealing point is easy to disassemble;

[0030] 5. The test bench can be supported against tilting to improve the stability of the test bench and facilitate the lifting and installation of the breathing valve.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a testing device for a breathing valve of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the operating table in the present invention;

[0034] Figure 3 It is the internal schematic diagram of the operating table in the present invention;

[0035] Figure 4 It is a structural schematic diagram of the test bench in the present invention;

[0036] Figure 5 It is the internal schematic diagram of the test bench in the present invention;

[0037] Figure 6 Schematic diagram of the installation position of each clamp assembly in the present invention;

[0038] Figure 7 It is a structural schematic diagram of the clamp assembly in the present invention;

[0039] Figure 8 is a cross-sectional view of the adapter flange of the present invention;

[0040] Fig. 9 is a schematic structural diagram of the first adjusting rod or the second adjusting rod in the present invention;

[0041] Fig.10 is another structural schematic diagram of the clamp assembly in the present invention;

[0042] The numbers and corresponding names in the figure are: 1. operating table, 2. control panel, 201. vacuum pump switch, 202. pressure pump switch, 203. negative pressure test switch, 204. positive pressure test switch, 205. pressure relief switch, 3. air pressure system, 301. vacuum pump pipeline, 302. pressure pump pipeline, 303. electric control box, 4. test bench, 5. adapter flange, 5a. sealing groove, 5b. bar hole, 5c. perforation, 6. test inlet, 7. pressure gauge interface, 8. fixture assembly, 801. slide rail, 802. slide seat, 803. quick clamp , 804. Stop plate, 9. U-type pressure gauge, 10. Pressure gauge, 11. Power interface, 12. Test outlet, 13. Support frame, 14. Sealing ring, 15. Lever, 16. Rotating shaft, 17. Top block, 18. Forma wheel, 19. First adjusting rod, 20. Second adjusting rod, 21. Support foot, 21a. Screw hole, 22. Rubber pad, 23a. Outer tube, 23b. Inner tube, 23c. Nut seat, 23d. Round nut, 24. Pulley, 25. Guide wheel, 26. Synchronous belt, 27. Handheld terminal, 28. Ultrasonic liquid level sensor. DETAILED DESCRIPTION

[0043] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0044] See also Figure 1 As shown, the present invention discloses a test device for a breathing valve, which mainly includes two independent parts, an operating table 1 and a test table 4; this design can effectively reduce the overall volume of the test device and avoid other problems caused by integration (for example, if the operating table 1 and the test table 4 are an integrated structure, the vibration caused by the operation of the operating table 1 will be transmitted to the test table 4, causing problems such as the displacement of the installation position of the breathing valve and the shaking of the valve body, thereby affecting the test accuracy), and the two independent parts are more convenient to move after the volume becomes smaller, which is suitable for flexible layout.

[0045] See also Figure 2-3 As shown, the operating table 1 is a box structure, and its side wall is provided with a power interface 11 for docking with the electric control box 303, and a test outlet 12 for docking with the vacuum pump pipeline 301 and the pressure pump pipeline 302, which are used to realize the connection and control of the circuit and gas circuit;

[0046] A control panel 2 is provided on the outside of the operating table 1. The control panel 2 can be tilted and installed on the top of the operating table 1. The angle formed with the horizontal plane is preferably about 60°, so as to facilitate the use of the test personnel; specifically, the control panel 2 includes a vacuum pump switch 201, a pressure pump switch 202, a negative pressure test switch 203, a positive pressure test switch 204 and a pressure relief switch 205. Two pressure gauges 10 are also provided above the control panel 2. The two pressure gauges 10 correspond to the negative pressure test switch 203 and the positive pressure test switch 204 one by one, respectively, and are used to display the output positive / negative pressure values, so as to facilitate the test personnel to grasp the air pressure information in real time and make adjustments;

[0047] A pneumatic system 3 is arranged inside the operating table 1, and the pneumatic system 3 specifically includes an electric control box 303, a vacuum pump pipeline 301, and a pressure pump pipeline 302. The electric control box 303 is connected to the control panel 2, and the operation of the vacuum pump pipeline 301 and the pressure pump pipeline 302 can be flexibly switched by controlling various buttons. It should be noted that the vacuum pump pipeline 301 and the pressure pump pipeline 302 in the pneumatic system 3 share a test outlet 12, and the two can be connected at the connection with the test outlet 12 by installing a three-way valve (not shown in the figure).

[0048] See also Figure 4 As shown, the test bench 4 is a tank structure, and a transfer flange 5 is provided at the upper end of the test bench 4. The lower end of the transfer flange 5 is connected to the interior of the test bench 4, and the upper end is used to dock the flange end of the breathing valve. A clamp assembly 8 is provided on the periphery of the transfer flange 5, which is used to press the flange end of the breathing valve onto the transfer flange 5 to achieve a sealed connection;

[0049] A test inlet 6 and a pressure gauge interface 7 are provided on the side of the test bench 4. The test inlet 6 can be connected to the test outlet 12 through a pneumatic pipeline, thereby connecting the test bench 4 with the air pressure system 3; the pressure gauge interface 7 is used to connect a U-shaped pressure gauge 9. For the convenience of use and observation, the U-shaped pressure gauge 9 can be installed on the test bench 4 near the pressure gauge interface 7. During the test, relevant data can be obtained by observing the liquid level changes of the pressure gauge interface 7, thereby judging the quality of the breathing valve.

[0050] When the above-mentioned test device is in use, the operating table 1 and the test table 4 are moved to appropriate positions for assembly, and then the breathing valve is hoisted onto the test table 4 and clamped and fixed using the clamp assembly 8. The tester tests its performance through the control panel 2 and records the relevant test data. Finally, it is compared with the standard data of the breathing valve to determine whether it is qualified. For details, see the test method of the breathing valve later.

[0051] Since the test operations are basically concentrated on the control panel 2, the tester only needs to control the corresponding switches to complete the test work, which is more convenient and simple to operate; and the U-type pressure gauge 9 can also be used to accurately obtain the positive / negative pressure data of the breathing valve opening. Compared with expensive electronic detection equipment, it has low cost and good practicality.

[0052] In addition to manual reading test methods, the test device is also compatible with automatic electronic testing, see Figure 1 , Figure 4 As shown, it can be equipped with a handheld terminal 27 connected to the operating table 1, and an ultrasonic liquid level sensor 28 is installed on the U-shaped pressure gauge. The handheld terminal 27 is controlled by a touch screen, and can collect electronic data from the pressure gauge 10, and record and view it, and finally obtain the pressure change curve of the breathing valve under positive and negative pressure opening and pressure maintenance conditions.

[0053] See also Figure 4-5 As shown, in some embodiments, there are multiple fixture assemblies 8, which are evenly distributed circumferentially on the outer circumference of the adapter flange 5, and multiple support frames 13 are evenly distributed circumferentially inside the test bench 4, and each support frame 13 is arranged below the corresponding fixture assembly 8.

[0054] The above structure adopts a layout of multiple circumferentially evenly distributed clamp assemblies 8, which can make the flange end of the breathing valve bear force evenly, thereby improving the stability and reliability of docking with the adapter flange 5; for example, preferably three clamp assemblies 8 distributed at 120° can press the breathing valve onto the adapter flange 5. In addition, considering that the test bench 4 is a tank structure, its upper end face is easily deformed and damaged under the load of the breathing valve and the clamp assembly 8, so a support frame 13 can be installed inside the test bench 4 to strengthen the structure of the upper end face of the test bench 4, and the number and position of the support frame 13 can correspond to the clamp assembly 8.

[0055] See also Figure 6-7 As shown, the fixture assembly 8 includes a slide rail 801 fixedly arranged on the upper end of the test bench 4, a slide seat 802 slidably arranged on the slide rail 801, and a quick clamp 803 fixedly arranged above the slide seat 802. The length direction of the slide rail 801 is perpendicular to and intersects with the axial direction of the adapter flange 5, and a stop plate 804 is arranged at one end of the slide rail 801 away from the adapter flange 5.

[0056] The use of the quick clamp 803 in the clamp assembly 8 can quickly press the breathing valve onto the adapter flange 5, which is convenient and efficient to operate. The position of the quick clamp 803 from the adapter flange 5 can be flexibly adjusted by the cooperation between the slide seat 802 and the slide rail 801 to fix breathing valves of different calibers, and the stop plate 804 has an anti-slip function to prevent the slide seat 802 from moving out of the slide rail 801. The specific structure of the slide rail 801 and the slide seat 802 is not limited, and it only needs to be able to slide along the radial direction of the adapter flange 5 and prevent axial slippage. For example, the slide rail 801 here is an inverted "T" shaped structure, and the slide seat 802 is an "I" shaped structure, and the bottom of the slide seat 802 is embedded in the slide rail 801 for movement.

[0057] In addition to the manual type, the clamp assembly 8 can also be an automatic type, see Fig.10 As shown, a pulley 24 can be installed at the end of each slide rail 801 away from the adapter flange 5, and a guide wheel 25 can be installed at the end close to the adapter flange 5, and a synchronous belt 26 can be used to connect the pulleys 24 and guide wheels 25 together. At the same time, one side of the synchronous belt 26 is respectively connected to the slide seat 802 on each slide rail 801 to ensure that when the synchronous belt 26 rotates, the slide seats 802 can move forward and backward synchronously.

[0058] When in use, the motor (not shown) drives one of the pulleys 24, and the synchronous belt 26 can be used to synchronously drive each slide 802 to move closer to or away from the adapter flange 5, thereby driving the quick clamp 803 to automatically move to a suitable position. Compared with the manual clamp assembly 8, the automatic clamp assembly 8 is more convenient to operate, and the forward or backward distance of the quick clamp 803 at each location is consistent, that is, the fixing point of the quick clamp 803 is accurate and consistent, which is more uniform and reliable for the force on the flange end of the breathing valve, and can better meet the requirements of high-precision testing.

[0059] See also Figure 6 As shown, in some embodiments, a sealing groove 5a is provided at the upper end of the adapter flange 5, and a sealing ring 14 is installed in the sealing groove 5a.

[0060] The above structure installs a sealing ring 14 on the adapter flange 5, and the sealing ring 14 can be an O-ring. In this way, the small gap between the flange end of the breathing valve and the adapter flange 5 can be filled by the sealing ring 14, which avoids the leakage of air pressure at the docking position, thereby ensuring the accuracy of the valve test.

[0061] Further, see Figure 8As shown, the inner wall of the adapter flange 5 is provided with strip holes 5b distributed along the axial direction, and a lever 15 is inserted into the strip hole 5b. The middle part of the lever 15 is rotatably connected to the strip hole 5b through a rotating shaft 16. The bottom of the sealing groove 5a is provided with a through hole 5c connected to the strip hole 5b, and a top block 17 connected to the lever 15 is provided in the through hole 5c; when there is no external force, the top block 17 is below the bottom of the sealing groove 5a.

[0062] Since the sealing ring 14 is inevitably worn out during long-term use, the sealing failure at the connection between the breathing valve and the adapter flange 5 will affect the test, and the replacement of the sealing ring 14 generally requires the use of corresponding tools, which is relatively cumbersome in operation. Therefore, this embodiment opens a bar hole 5b and a through hole 5c, and installs a lever 15 that can rotate up and down in the bar hole 5b, and installs a slightly smaller top block 17 in the through hole 5c. The lever 15 is combined with the top block 17 to form a lever structure. In this way, when the sealing ring 14 needs to be removed, the lever 15 can be pressed down to drive the top block 17 to rise, and the sealing ring 14 in the sealing groove 5a can be easily ejected, so as to achieve the purpose of convenient replacement.

[0063] See also Figure 4 , Figure 5 and Fig. 9 As shown, in some embodiments, a Forma wheel 18 is provided below the test bench 4, and a plurality of leg assemblies are evenly distributed around the side of the test bench 4, and the leg assemblies include a first adjusting rod 19, a second adjusting rod 20 and a supporting foot 21, one end of the first adjusting rod 19 is hinged to the top of the test bench 4, and the other end is hinged to the supporting foot 21, one end of the second adjusting rod 20 is hinged to the bottom of the test bench 4, and the other end is hinged to the middle of the first adjusting rod 19, screw holes 21a are provided at the four corners of the supporting foot 21, and a rubber pad 22 is provided below the supporting foot 21.

[0064] The above structure is installed with a Foma wheel 18, which is composed of a roller part and a foot pad part, and the two can be switched with each other, which facilitates the movement and temporary fixation of the test bench 4. In the process of installing the breathing valve, it is difficult to effectively stabilize the test bench 4 by relying solely on the foot pad part of the Foma wheel 18, which will increase the difficulty of installing the breathing valve. Therefore, it is possible to choose to install multiple leg assemblies on the side of the test bench 4 for auxiliary cooperation. For example, it is still preferred to use three leg assemblies distributed at 120° for anti-tilt support. When used specifically, a triangular structure is formed by unfolding the first adjustment rod 19 and the second adjustment rod 20 to adjust the length, and at the same time, the support foot 21 is in contact with the ground to form an anti-tilt support. The rubber pad 22 under the support foot 21 can increase the friction between the support foot 21 and the ground. In addition, if the test environment permits, screws can be installed in the screw holes 21a to fix the support foot 21 on the ground to further improve the stability.

[0065] Preferably, the first adjusting rod 19 and the second adjusting rod 20 have the same structure, and both include an outer tube 23a and an inner tube 23b. A nut seat 23c is provided at one end of the outer tube 23a, and a round nut 23d is rotatably installed in the threaded seat. One end of the inner tube 23b passes through the round nut 23d and then extends into the outer tube 23a. The inner tube 23b is threadedly matched with the round nut 23d.

[0066] The first adjusting rod 19 and the second adjusting rod 20 are both manual adjusting rods. When in use, the round nut 23d in the threaded seat is rotated clockwise / counterclockwise to drive the inner tube 23b to slide and retract relative to the outer tube 23a, which has the advantages of simple operation and high adjustable precision.

[0067] The present invention also provides a method for testing a breathing valve, characterized in that the method uses any of the above-mentioned breathing valve testing devices to perform the test, and comprises the following steps:

[0068] S1. Assembling the test device: Move the operating table 1 and the test table 4 to suitable positions and connect the pneumatic pipes to form a complete test device;

[0069] S2. Breathing valve installation: Use a crane to hoist the breathing valve to be tested above the test bench 4, align it and slowly place it on the adapter flange 5, and then use the clamp assembly 8 to press and fix the two together;

[0070] S3. Breathing valve test: select the air pressure system 3 through the control panel 2, connect the breathing valve after obtaining the required air pressure, observe the liquid level change of the U-type pressure gauge 9 and record the corresponding data, and compare the standard data of the breathing valve to determine whether it is qualified; wherein,

[0071] When the positive pressure of the breathing valve to be tested is reached, the pressure relief switch 205 and the negative pressure test switch 203 are closed, the positive pressure test switch 204 is opened and the pressure pump switch 202 is pressed to start the inflation in the test bench 4, and at the same time, the liquid level change of the U-type pressure gauge 9 is observed until the breathing valve is opened, the pressure pump switch 202 is released, and the data corresponding to the liquid level of the U-type pressure gauge 9 is recorded. After the test is completed, the pressure relief switch 205 is opened to release the pressure;

[0072] When the negative pressure opening pressure of the breathing valve to be tested is reached, the pressure relief switch 205 and the positive pressure test switch 204 are closed, the negative pressure test switch 203 is opened and the vacuum pump switch 201 is pressed to start evacuating the test bench 4, and at the same time, the liquid level change of the U-type pressure gauge 9 is observed until the breathing valve is opened, the vacuum pump switch 201 is released, and the data corresponding to the liquid level of the U-type pressure gauge 9 is recorded. After the test is completed, the pressure relief switch 205 is opened for pressure relief;

[0073] S4. Disassembly of the test device: After the test is completed, clean the test device, disconnect the pneumatic pipeline, and then move the operating table 1 and the test table 4 to their original positions.

[0074] In order to improve the stability of the test bench 4 itself and facilitate the remote installation of the breathing valve, in step S1, after the test bench 4 is moved to a suitable position, the side leg assembly of the test bench 4 can be lowered for anti-tilt support.

[0075] To meet the test requirements of a small breathing valve, in step S2, the nominal diameter of the breathing valve is 50-500 mm, and the maximum testable pressure of the breathing valve is 0.4 MPa.

[0076] The present invention is not limited to the above-mentioned specific implementation modes. For ordinary technicians in this field, various changes made based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A breathing valve testing device, characterized in that: include: An operating table (1), wherein the operating table (1) is a box structure, a control panel (2) is arranged on the outside of the operating table (1), and a pneumatic system (3) is arranged on the inside; and A test bench (4), wherein the test bench (4) is a tank structure, an adapter flange (5) is arranged at the upper end of the test bench (4), a test inlet (6) and a pressure gauge interface (7) are arranged on the side, a fixture assembly (8) is arranged on the outer periphery of the adapter flange (5), the test inlet (6) is connected to the air pressure system (3), and the pressure gauge interface (7) is connected to a U-shaped pressure gauge (9); There are a plurality of the fixture assemblies (8), which are evenly distributed circumferentially on the outer circumference of the adapter flange (5); a plurality of support frames (13) are evenly distributed circumferentially inside the test bench (4), and each support frame (13) is arranged below a corresponding fixture assembly (8); The clamp assembly (8) comprises a slide rail (801) fixedly arranged at the upper end of the test bench (4), a slide seat (802) slidably arranged on the slide rail (801), and a quick clamp (803) fixedly arranged above the slide seat (802); the length direction of the slide rail (801) is perpendicular to and intersects with the axial direction of the adapter flange (5); a stop plate (804) is arranged at one end of the slide rail (801) away from the adapter flange (5).

2. The breathing valve testing device according to claim 1, characterized in that: Two pressure gauges (10) are arranged above the control panel (2); the control panel (2) comprises a vacuum pump switch (201), a pressure pump switch (202), a negative pressure test switch (203), a positive pressure test switch (204) and a pressure relief switch (205); the negative pressure test switch (203) and the positive pressure test switch (204) respectively correspond to the two pressure gauges (10).

3. The breathing valve testing device according to claim 1, characterized in that: The pneumatic system (3) comprises an electric control box (303), a vacuum pump pipeline (301) and a pressure pump pipeline (302); a side wall of the operating table (1) is provided with a power supply interface (11) for docking with the electric control box (303), and a test outlet (12) for docking with the vacuum pump pipeline (301) and the pressure pump pipeline (302).

4. The breathing valve testing device according to claim 1, characterized in that: A sealing groove (5a) is provided at the upper end of the adapter flange (5), and a sealing ring (14) is installed in the sealing groove (5a).

5. The breathing valve testing device according to claim 4, characterized in that: The inner wall of the adapter flange (5) is provided with strip holes (5b) distributed along the axial direction, a lever (15) is inserted into the strip hole (5b), the middle part of the lever (15) is rotatably connected to the strip hole (5b) via a rotating shaft (16), the bottom of the sealing groove (5a) is provided with a through hole (5c) connected to the strip hole (5b), and a top block (17) connected to the lever (15) is provided in the through hole (5c); when no external force is applied, the top block (17) is located below the bottom of the sealing groove (5a).

6. The breathing valve testing device according to claim 1, characterized in that: A Forma wheel (18) is arranged below the test bench (4), and a plurality of leg assemblies are evenly distributed around the side of the test bench (4), the leg assemblies comprising a first adjustment rod (19), a second adjustment rod (20) and a support foot (21), one end of the first adjustment rod (19) is hinged to the top of the test bench (4), and the other end is hinged to the support foot (21), one end of the second adjustment rod (20) is hinged to the bottom of the test bench (4), and the other end is hinged to the middle of the first adjustment rod (19), four corners of the support foot (21) are provided with screw holes (21a), and a rubber pad (22) is arranged below the support foot (21).

7. The breathing valve testing device according to claim 6, characterized in that: The first adjusting rod (19) and the second adjusting rod (20) have the same structure, and both comprise an outer tube (23a) and an inner tube (23b). A nut seat (23c) is provided at one end of the outer tube (23a), and a round nut (23d) is rotatably installed in the nut seat (23c). One end of the inner tube (23b) passes through the round nut (23d) and then extends into the outer tube (23a). The inner tube (23b) and the round nut (23d) are threadedly matched.

8. A method for testing a breathing valve, characterized in that: The test device for the breathing valve according to any one of claims 1 to 7 is used for testing, comprising the following steps: S1. Assembling the test device: Move the operating table (1) and the test table (4) to suitable positions and connect the pneumatic pipes to form a complete test device; S2. Breathing valve installation: Use a crane to hoist the breathing valve to be tested above the test bench (4), align it and slowly place it on the adapter flange (5), and then use a clamp assembly (8) to press and fix the two together; S3. Breathing valve test: Select the air pressure system (3) through the control panel (2), connect the breathing valve after obtaining the required air pressure, observe the liquid level change of the U-type pressure gauge (9) and record the corresponding data, and compare the standard data of the breathing valve to determine whether it is qualified; S4. Disassembly of the test device: After the test is completed, clean the test device, disconnect the pneumatic pipeline, and then move the operating table (1) and the test table (4) to their original positions.

9. The breathing valve testing method according to claim 8, characterized in that: In the step S1, after the test bench (4) is moved to a suitable position, the leg assembly of the side of the test bench (4) can be lowered to provide anti-tilt support.

10. The breathing valve testing method according to claim 8, characterized in that: In step S2, the nominal diameter of the breathing valve is 50-500 mm, and the maximum testable pressure of the breathing valve is 0.4 MPa.

11. The breathing valve testing method according to claim 8, characterized in that: In step S3, when the positive pressure opening pressure of the breathing valve to be tested is reached, the pressure relief switch (205) and the negative pressure test switch (203) are closed, the positive pressure test switch (204) is opened and the pressure pump switch (202) is pressed to start inflation in the test bench (4), and at the same time, the liquid level change of the U-type pressure gauge (9) is observed until the breathing valve is opened, the pressure pump switch (202) is released, and the data corresponding to the liquid level of the U-type pressure gauge (9) is recorded. After the test is completed, the pressure relief switch (205) is opened to release the pressure.

12. The breathing valve testing method according to claim 11, characterized in that: In step S3, when the negative pressure opening pressure of the breathing valve to be tested is reached, the pressure relief switch (205) and the positive pressure test switch (204) are closed, the negative pressure test switch (203) is opened and the vacuum pump switch (201) is pressed to start evacuating air from the test bench (4), and at the same time, the liquid level change of the U-type pressure gauge (9) is observed until the breathing valve is opened, the vacuum pump switch (201) is released, and the data corresponding to the liquid level of the U-type pressure gauge (9) is recorded. After the test is completed, the pressure relief switch (205) is opened to release the pressure.

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