Pressure test tool of stop valve and method thereof

Abstract

The invention belongs to the technical field of valve pressure testing, and particularly relates to a pressure testing tool of a stop valve and a method thereof. Comprising a test bench; the top of the test bench is provided with two symmetrical semi-ring base blocks. A clamping brake device is arranged on the semi-ring base block; the clamping brake device comprises a semi-ring groove which is formed in the semi-ring base block, and the circle centers of the semi-ring groove and the semi-ring base block are coaxial; the two ends of the semi-ring groove extend to the two ends of the semi-ring base block; the two semi-ring grooves are located in moving paths of flange plates at the two ends of the stop valve, the flange plates and the semi-ring grooves are matched in a matched mode, and the circle centers of the flange plates and the semi-ring grooves are coaxial. A pressure applying and strength measuring assembly is arranged on the test bed; therefore, the pressure block is attached to the outer surface of the valve body of the stop valve, test data shortage is avoided, and test data distortion caused by overhigh pressure or no pressure borne by a local area of the valve body during testing is avoided, so that a reliable basis is provided for product quality judgment, meanwhile, the safety of subsequent use of the stop valve is guaranteed, the test limitation of a tool is finally reduced, and the test efficiency is improved. And the use effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of valve pressure testing technology, specifically a pressure testing fixture and method for a gate valve. Background Technology

[0002] Gate valves are forced-seal straight-stroke valves, mainly used for regulating and shutting off the flow of media in pipeline systems. They are a widely used type of valve in industrial production, building water supply and drainage, and other fields. In order to verify the deformation and rupture resistance of their shell structure under rated and ultimate pressure conditions, and to avoid safety accidents and economic losses caused by shell failure, it is necessary to conduct strength tests on gate valves.

[0003] The existing gate valve pressure testing fixtures do not collect complete experimental data during the testing process. They cannot be adapted to gate valves of different shapes and cannot complete accurate strength tests under the fit condition. This results in some areas of the valve body bearing excessive pressure while other areas do not bear effective pressure, thus causing the test data to be distorted. This not only fails to provide a reliable basis for product quality judgment, but also makes it difficult to ensure the safety of the gate valve under test in subsequent use. Ultimately, it expands the testing limitations of the fixtures and reduces their effectiveness. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a pressure testing fixture and method for a shut-off valve, which effectively solves the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure testing fixture for a gate valve, comprising a test bench; two symmetrical semi-annular base blocks are mounted on the top of the test bench; clamping and braking devices are provided on the semi-annular base blocks to prevent the gate valve from shifting position during testing and affecting the test results; the clamping and braking devices include semi-annular grooves disposed within the semi-annular base blocks, and the two are coaxial; the two ends of the semi-annular grooves extend to the two ends of the semi-annular base blocks; the two semi-annular grooves are located within the movement path of the flanges at both ends of the gate valve, the flanges and the semi-annular grooves fit together, and their centers are coaxial; a pressure testing component is provided on the test bench for performing strength testing on the gate valve; the pressure testing component includes a pressure block located on the top of the test bench; The first base is installed on both sides of the test bench; Guide cylinder, connected to the top of the first base; The guide slider is connected to the guide cylinder through the side near the test bench; the guide cylinder and the guide slider are in sliding fit. A limit-connection replacement unit is disposed on the guide slider; the limit-connection replacement unit is used to conveniently replace pressure blocks of different shapes; the limit-connection replacement unit includes a limiting cylinder, which is installed on the side of the pressure block near the test bench; the limiting cylinder is connected through the guide slider on the side away from the test bench; the guide slider and the limiting cylinder are in sliding cooperation; the outer wall of the limiting cylinder is provided with a number of equidistantly arranged limiting slots.

[0006] Preferably, it includes a displacement screw, which is installed on the back side of the two semi-ring base blocks; A drive source is mounted on a semi-ring base block; the output end of the drive source is connected to a position screw. The positioning block is threadedly connected to the positioning screw; A movable cylinder is mounted on a semi-ring base block; a movable block is connected to the movable cylinder through the side of the semi-ring base block; the movable cylinder and the movable block are in sliding fit.

[0007] Preferably, it includes a braking circular block connected to the positioning block; The brake cylinder is connected through the brake block to the side of the flange near the end of the shut-off valve; the brake block and the brake cylinder are in sliding fit. Brake limit plate, connected to the end of brake cylinder away from flange; Brake plate, connected to the end of brake cylinder near the flange; flange is located on the movement path of brake plate; A brake spring is sleeved on a brake cylinder; one end of the brake spring is fixedly connected to a brake limiting plate, and the other end is fixedly connected to a brake block; a brake lever is also installed on the brake block; the screw hole on the flange is located on the movement path of the brake lever; a brake pin is also installed on the side of the brake clamp away from the brake cylinder; the medium flow hole on the flange is located on the movement path of the brake pin; the medium flow hole and the brake pin are fitted together.

[0008] Preferably, it includes a telescopic cylinder, which is installed on the top of the test bench; A U-shaped connecting plate is attached to the output end of the telescopic cylinder; both ends of the U-shaped connecting plate are connected to two guide sliders.

[0009] Preferably, it includes a positioning cylinder that is connected through the guide slider on the side near the test bench; the positioning cylinder and the guide slider are in sliding engagement. A positioning horizontal plate is installed at the end of the positioning cylinder near the test bench. A positioning spring is sleeved on a positioning cylinder; one end of the positioning spring is fixedly connected to a guide slider, and the other end is fixedly connected to a positioning horizontal plate; the side of the positioning horizontal plate away from the top of the test bench is located on the moving path of the limiting cylinder near the top of the test bench.

[0010] Preferably, it includes a second base, which is mounted on both sides of the guide slider; A limiting slide rod is connected through the side of the second base; the second base and the limiting slide rod are slidably engaged; one end of the limiting slide rod is connected to a limiting circular plate, and the other end is connected to a limiting horizontal plate; the limiting horizontal plate is located on the side of the limiting slot. A limiting spring is sleeved on a limiting slide rod; one end of the limiting spring is fixedly connected to a limiting circular plate, and the other end is fixedly connected to a second base. The limiting block is installed on the side of the limiting plate near the limiting slot; when the limiting cylinder reaches the designated position, the limiting block passes through the side of the guide slider and connects with one of the limiting slots.

[0011] Preferably, the test bench is further provided with a pressure-bearing and anti-impact mechanism; the pressure-bearing and anti-impact mechanism includes a third base, which is installed on the opposite surfaces of two semi-ring base blocks; An energy-absorbing sliding column is connected through the third base to the side near the top of the test bench; the energy-absorbing sliding column is slidably fitted with the third base; a pressure-bearing square plate is connected to the end of the energy-absorbing sliding column away from the test bench; the pressure-bearing square plate is located below the shut-off valve; the side of the shut-off valve near the top of the test bench is located on the moving path of the pressure-bearing square plate; an energy-absorbing limiting plate is connected to the end of the energy-absorbing sliding column near the test bench. An energy-absorbing spring is sleeved on an energy-absorbing sliding column; one end of the energy-absorbing spring is fixedly connected to the third base, and the other end is fixedly connected to the energy-absorbing limiting plate.

[0012] Preferably, it includes an oriented cylinder mounted on an energy-absorbing limiting plate; one end of the oriented cylinder away from the energy-absorbing limiting plate extends through to the bottom of the test bench; the oriented cylinder is slidably fitted with the test bench; A directional sliding plate is located at the bottom of the test bench; the side of the directional sliding plate near the bottom of the test bench is connected to a directional cylinder; the directional cylinder and the directional sliding plate are in sliding engagement. A directional spring is sleeved on a directional cylinder; one end of the directional spring is fixedly connected to the bottom of the test bench, and the other end is fixedly connected to a directional sliding plate; an extension block is installed on the directional sliding plate; a directional rack is connected to the extension block; a slide rail is installed on the directional rack; a fourth base is installed at the bottom of the test bench; the slide rail is fitted into the fourth base, and the two slide in cooperation.

[0013] Preferably, it includes a retaining seat, which is mounted on the guide slider; A fixed pulley is connected to the first base; A winding roller is located at the bottom of the test bench; a rotating shaft is connected to the winding roller. The fifth base is connected to the bottom of the test bench; the rotating shaft is connected to the fifth base; a spring is installed on the rotating shaft; the end of the spring is fixedly connected to the fifth base; One end of the cable is connected to the fixed seat, and the other end is wrapped around the winding roller after passing over the fixed pulley. A directional gear is connected to the end of the rotating shaft away from the fifth base; the directional gear and the directional rack are meshed together.

[0014] This invention also provides a method for using a pressure testing fixture for a shut-off valve, comprising the following steps: S1. Place the shut-off valve on the semi-ring base block, so that the flanges at both ends of the shut-off valve are embedded in the semi-ring groove, and at the same time operate the clamping and braking device to clamp and fix the shut-off valve. S2. Activate the pressure testing component to drive the pressure block to move toward the valve body of the shut-off valve until the pressure block is tightly attached to the outer surface of the valve body. S3. After the pressure block is in contact with the valve body, the pressure block is continuously applied to the valve body by the pressure testing component until the pressure reaches the preset value. Observe and record whether there are cracks, deformations or damages on the surface of the shut-off valve to complete the shut-off valve strength test.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The limit block moves back to its original position, passing through the guide slider and connecting with one of the limit slots, thereby lowering the limit cylinder to set the limit and completing the installation of the pressure block. Since there are several limit slots, the pressure block can be installed at different heights for operation, reducing the limitations of the tooling. At the same time, after the pressure block is installed, the positioning spring in the buffer state cannot be reset, and the resulting elastic force acts on the limit cylinder, thereby increasing the contact friction and strength between the limit slot and the limit block, preventing the pressure block from dislodging due to non-human factors during use, and improving the tooling's performance. This allows the tooling to be used conveniently and quickly without the need for any tools. The tooling facilitates the loading and unloading of pressure blocks, allowing for easy replacement of pressure blocks of different shapes. This avoids operational difficulties caused by the lack of suitable tools during the replacement process, reducing the limitations of tooling use. As a result, the tooling can be adapted to test gate valves of different shapes, ensuring that the pressure block fits snugly against the outer surface of the gate valve body. This prevents missing test data and ensures accurate strength testing when the pressure block and valve body are in close contact. It also prevents test data distortion caused by excessive or insufficient pressure in local areas of the valve body during testing, thus providing a reliable basis for product quality assessment. At the same time, it also ensures the safety of the gate valve in subsequent use, ultimately reducing the testing limitations of the tooling and improving its use and testing effectiveness. (2) The two brake clamps move relative to each other, thereby contacting the two flanges on both sides to clamp the gate valve, preventing it from shaking or dislodging during the test and affecting the test results, thus improving the test effect and accuracy of the tooling for the gate valve; before the brake clamps contact the flanges, the brake pins on the brake clamps first enter the medium flow hole of the flanges to position the gate valve to be clamped and fixed, so as to prevent the position from deviating from the pre-made position during clamping and causing the test position to change, further preventing the gate valve from dislodging due to non-human factors during the clamping process, thus improving the test accuracy of the tooling for the gate valve; it is worth mentioning that after the brake clamps contact the flanges, the positioning screw continues to move. When the moving block moves, its brake block moves within the brake cylinder on the brake clamp, keeping the brake spring in a buffered state. This further increases the contact force and friction between the brake clamp and the flange, thereby improving the clamping effect on the gate valve and enhancing its testing performance. Simultaneously, when the brake clamp stops moving, the brake block continues to move, causing its brake lever to enter the screw hole on the flange. This limits the angle of the flange, preventing angle changes caused by excessive pressure on the valve body or other non-human factors during testing. This ensures that the valve body remains in the correct position for testing, reducing the limitations of tooling use and improving its performance. (3) The directional sliding plate moves closer to the bottom of the test bench. Under the action of the directional cylinder and the directional spring, it drives the energy-absorbing limit plate to move upward. The directional spring is in a buffer state, so that the energy-absorbing sliding column on the energy-absorbing limit plate moves to the upper limit of the third base, so that the energy-absorbing spring is in a buffer state. This drives the pressure-bearing square plate to move upward, so that it contacts the bottom of the shut-off valve. At the same time, it cooperates with the downward-moving pressure block to apply pressure to the upper and lower sides of the shut-off valve simultaneously, reducing the test time for single-sided pressure application, improving the test efficiency of the tooling, and avoiding dead corners in the pressure application area that cause some areas of the valve body to not be pressured, thereby improving the test effect of the shut-off valve. This ensures the accuracy of the tooling during testing and further improves its performance. It's worth noting that the buffering force provided by the energy-absorbing and directional springs allows the pressure block to suddenly act on the pressure plate when the valve body breaks or is damaged due to insufficient pressure during testing. The force generated when the valve body breaks also acts on the pressure plate. This buffering force reduces the impact force caused by the valve body breaking, extending the tooling's lifespan and improving its performance, thus preventing damage during the testing process. (4) The pressure block installed on the two guide sliders moves close to the valve body of the fixed gate valve. The pressure block contacts the valve body of the gate valve. By continuously operating the pressure block with the telescopic cylinder, pressure is applied to the valve body, and the strength test of the gate valve can be completed. After the pressure value of the valve body is increased to the required value for the test, the strength of the gate valve can be determined by observing whether the valve body breaks or cracks. Thus, the pressure test operation of the gate valve is completed. It is worth mentioning that the shape of the pressure block used to test the gate valve body is matched with the surface of the valve body. This allows the surface of the valve body to be in close contact with the pressure block during the test, so as to accurately test the strength of the gate valve. This avoids excessive pressure in some areas of the valve body or failure to obtain effective pressure, so that the test data is not distorted, ensuring product quality. At the same time, the quality judgment basis is reliably guaranteed, further improving the safety of the gate valve. This reduces the testing limitations of the tooling and improves the effectiveness of the tooling. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fixed pulley structure of the present invention; Figure 3 This is a schematic diagram of the pressure-bearing square plate structure of the present invention; Figure 4 This is a schematic diagram of the telescopic cylinder structure of the present invention; Figure 5 This is a front view of the brake insert of the present invention; Figure 6 This is a schematic diagram of the winding roller structure of the present invention; Figure 7 This is an exploded view of the semi-annular groove of the present invention; Figure 8 This is a cross-sectional view of the pressure block of the present invention; Figure 9 This is a schematic diagram of the directional sliding plate structure of the present invention; Figure 10 This is a schematic diagram of the semi-ring base block structure of the present invention; Figure 11 This is a cross-sectional view of the guide slider of the present invention; Figure 12 This is a cross-sectional view of the extended block of the present invention; Figure 13 This is an exploded view of the limiting cylinder of the present invention; Figure 14This is a schematic diagram of the braking block structure of the present invention; In the diagram: 1. Test bench; 2. Semi-annular base block; 3. Semi-annular groove; 4. Pressure block; 5. First base; 6. Guide cylinder; 7. Guide slider; 8. Limiting cylinder; 9. Limiting slot; 10. Positioning screw; 11. Drive source; 12. Positioning block; 13. Positioning cylinder; 14. Braking block; 15. Braking cylinder; 16. Braking clamp; 17. Braking spring; 18. Braking lever; 19. Braking insert; 20. Telescopic cylinder; 21. U-shaped connecting plate; 22. Positioning cylinder; 23. Positioning cross plate; 24. Positioning spring; 25. Second base 26. Limiting slide bar; 27. Limiting horizontal plate; 28. Limiting spring; 29. ​​Limiting insert; 30. Third base; 31. Energy-absorbing slide column; 32. Pressure-bearing square plate; 33. Energy-absorbing limiting plate; 34. Energy-absorbing spring; 35. Directional cylinder; 36. Directional sliding plate; 37. Directional spring; 38. Extension block; 39. Directional rack; 40. Slide rail; 41. Fourth base; 42. Fixed square base; 43. Fixed pulley; 44. Winding roller; 45. Rotating shaft; 46. Fifth base; 47. Spring spring; 48. Cable; 49. Directional gear. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Implementation examples, by Figures 1 to 14The present invention includes a test bench 1; two symmetrical semi-annular blocks 2 are mounted on the top of the test bench 1; clamping and braking devices are provided on the semi-annular blocks 2 to prevent the shut-off valve from shifting position during testing and affecting the test results; the clamping and braking devices include semi-annular grooves 3, which are disposed within the semi-annular blocks 2 and are coaxial in center; the two ends of the semi-annular grooves 3 extend to the two ends of the semi-annular blocks 2; the two semi-annular grooves 3 are located within the moving path of the flanges at both ends of the shut-off valve, the flanges and the semi-annular grooves 3 are fitted together and are coaxial in center; a positioning screw 10 is mounted on the opposite side of the two semi-annular blocks 2; a drive source 11 is mounted on the semi-annular blocks 2; the output end of the drive source 11 is connected to the positioning screw 10; a positioning block 12 is threadedly connected to the positioning screw 10; a positioning cylinder 13 is mounted on the semi-annular blocks 2; the positioning block 12 is connected through to the positioning cylinder 13 on the side near the semi-annular blocks 2; the positioning cylinder 13 and the positioning block 12. Sliding fit; Braking block 14, connected to the movable block 12; Braking cylinder 15, penetrating and connected to the side of the braking block 14 near the end flange of the shut-off valve; Braking block 14 and braking cylinder 15 are in sliding fit; Braking limit plate, connected to the end of the braking cylinder 15 away from the flange; Braking clamp 16, connected to the end of the braking cylinder 15 near the flange; The flange is located on the moving path of the braking clamp 16; Braking spring 17, sleeved on the braking cylinder 15; One end of the braking spring 17 is fixedly connected to the braking limit plate, and the other end is fixedly connected to the braking block 14; Braking rod 18 is also installed on the braking block 14; The screw hole on the flange is located on the moving path of the braking rod 18; Braking pin 19 is also installed on the side of the braking clamp 16 away from the braking cylinder 15; The medium flow hole on the flange is located on the moving path of the braking pin 19; The medium flow hole and the braking pin 19 are in fit. By placing the flange on the gate valve into the semi-annular groove 3 on the semi-annular base block 2, the gate valve can be initially limited. By starting the drive source 11, its output end drives the positioning screw 10 to rotate, causing the threaded positioning block 12 to move along the positioning cylinder 13 close to the semi-annular base block 2 for limitation. The positioning block 12 drives the brake block 14 to move, which in turn drives the brake clamp 16 to move through the brake cylinder 15 and brake spring 17, moving it closer to the side of the flange. This causes the two brake clamps 16 on the opposite sides of the two flanges at both ends of the gate valve to move relative to each other, thus contacting the two sides of the two flanges and clamping the gate valve. This prevents the gate valve from shaking or dislodging during the test, which would affect the test results and improve the testing effect and accuracy of the tooling for the gate valve. Before the brake clamp 16 contacts the flange, the brake pin 19 on the brake clamp 16 first enters the medium flow hole of the flange to position the gate valve to be clamped and fixed, preventing deviations from the pre-set position during clamping that could affect the test. The change in position further prevents the gate valve from dislodging due to non-human factors during clamping, thereby improving the testing accuracy of the gate valve by the tooling. It is worth mentioning that when the brake clamp 16 contacts the flange, the positioning screw 10 continues to drive the positioning block 12 to move, which causes the brake block 14 on it to move within the brake cylinder 15 on the brake clamp 16, so that the brake spring 17 is in a buffer state, further increasing the contact force and friction between the brake clamp 16 and the flange, thereby further improving the clamping effect on the gate valve and improving its testing effect. At the same time, when the brake clamp 16 stops moving, the brake block 14 continues to move, causing the brake rod 18 on it to enter the screw hole on the flange, limiting the angle position of the flange, avoiding the angle change caused by excessive pressure on the valve body or other non-human factors during the test, so that the valve body can always be in the moving position of the pressure block 4 for testing, reducing the limitations of the tooling and thus improving its use effect.

[0020] The test bench 1 in this embodiment is equipped with a pressure testing component for testing the strength of the shut-off valve. The pressure testing component includes a pressure block 4 located at the top of the test bench 1; a first base 5 installed on both sides of the test bench 1; a guide cylinder 6 connected to the top of the first base 5; a guide slider 7 connected to the guide cylinder 6 through the side near the test bench 1; the guide cylinder 6 and the guide slider 7 are in sliding fit; a telescopic cylinder 20 installed at the top of the test bench 1; a U-shaped connecting plate 21 connected to the output end of the telescopic cylinder 20; the two ends of the U-shaped connecting plate 21 are connected to the two guide sliders 7; a semi-ring plate is also provided at the top of the test bench 1, located at the other end of the shut-off valve except for the two ends, and one semi-ring plate and two semi-ring base blocks 2 are combined to form a T-shape. The gate valve to be tested is placed on the semi-annular base block 2 on the test bench 1, with the flanges at both ends of the gate valve placed into the semi-annular groove 3, and the other end of the gate valve placed on the semi-annular plate. This T-shaped gate valve is supported by the T-shape formed by the two semi-annular base blocks 2 and the semi-annular plate, which serves to limit the gate valve's position. Because all three ends are limited, the limited gate valve cannot rotate or shake. Simultaneously, a clamping braking device can be operated to further limit and fix the gate valve placed on the two semi-annular base blocks 2 and the semi-annular plate, preventing dislocation or swaying due to excessive force during testing. This improves the testing accuracy and stability of the gate valve, enhancing the testing and usage effectiveness of the fixture. The specific testing steps after fixing the gate valve are as follows: Activate the telescopic cylinder 20, causing it to move the U-shaped connecting plate 21 on its output end downwards. This causes the two guide sliders 7 on it to move downwards at the upper limit of the guide cylinder 6, thus increasing the pressure on the two guide sliders 7. The pressure block 4 moves close to the valve body of the fixed shut-off valve, and contacts the valve body. By continuously operating the pressure block 4 through the telescopic cylinder 20, pressure is applied to the valve body, thus completing the strength test of the shut-off valve. After increasing the pressure value of the valve body to the required test value, the strength of the shut-off valve can be determined by observing whether the valve body breaks or cracks. This completes the pressure test of the shut-off valve. It is worth mentioning that the shape of the pressure block 4 used for the pressure test of the shut-off valve body matches the surface of the valve body. This allows for precise strength testing when the valve body surface is in close contact with the pressure block 4 during the test, avoiding excessive pressure in some areas of the valve body or insufficient pressure. This ensures that the test data is not distorted, guarantees product quality, and provides reliable quality judgment criteria. This further improves the safety of the shut-off valve and reduces the testing limitations of the tooling, thus improving the effectiveness of the tooling.

[0021] In this embodiment, the guide slider 7 is provided with a limit-connection replacement unit for convenient replacement of pressure blocks 4 of different shapes. The limit-connection replacement unit includes a limiting cylinder 8, which is installed on the side of the pressure block 4 near the test bench 1; the limiting cylinder 8 is connected through the guide slider 7 away from the test bench 1; the guide slider 7 and the limiting cylinder 8 are in sliding fit; the outer wall of the limiting cylinder 8 is provided with several equally spaced limiting slots 9; a positioning cylinder 22 is connected through the guide slider 7 near the test bench 1; the positioning cylinder 22 is in sliding fit with the guide slider 7; a positioning horizontal plate 23 is installed on the end of the positioning cylinder 22 near the test bench 1; a positioning spring 24 is sleeved on the positioning cylinder 22; one end of the positioning spring 24 is fixedly connected to the guide slider 7, and the other end is fixedly connected to the positioning horizontal plate 23; the positioning horizontal plate 23... The side away from the top of the test bench 1 is located on the moving path of the limiting cylinder 8 near the top of the test bench 1; the second base 25 is installed on both sides of the guide slider 7; the limiting slide rod 26 is connected through the side of the second base 25; the second base 25 and the limiting slide rod 26 are in sliding fit; one end of the limiting slide rod 26 is connected to the limiting circular plate, and the other end is connected to the limiting horizontal plate 27; the limiting horizontal plate 27 is located on the side of the limiting slot 9; the limiting spring 28 is sleeved on the limiting slide rod 26; one end of the limiting spring 28 is fixedly connected to the limiting circular plate, and the other end is fixedly connected to the second base 25; the limiting insert 29 is installed on the side of the limiting horizontal plate 27 near the limiting slot 9; when the limiting cylinder 8 reaches the designated position, the limiting insert 29 passes through the side of the guide slider 7 and connects to one of the limiting slots 9; During testing, the shape of the gate valve being tested is not the same each time. Therefore, a pressure block 4 matching the valve body's surface is needed to fully and accurately test the gate valve's strength. By pulling the limiting horizontal plate 27 outwards, it is limited to the second base 25 via the limiting slide rod 26. This puts the limiting spring 28 in a buffered state, causing the limiting insert 29 on the limiting horizontal plate 27 to disengage from the guide slider 7 and no longer connect to the limiting slot 9. This releases the limiting setting on the limiting cylinder 8, causing the positioning spring 24, which was originally in a buffered state, to reset. The reset of the positioning spring 24 drives the positioning horizontal plate 23 to reset and move, ejecting the limiting cylinder 8 and preventing it from connecting to the guide slider 7. This allows the pressure block 4 on the limiting cylinder 8 to be ejected, completing the disassembly operation. When the tooling is testing the gate valve and encounters gate valves of different shapes, a pressure block 4 matching the outer shape of the gate valve body is selected. The limiting cylinder 8 on the pressure block 4 is aligned with the hole on the guide slider 7 and inserted, causing the limiting cylinder 8 to move at its upper limit on the guide slider 7 and contact the positioning plate 23. This causes the positioning cylinder 22 on the limiting cylinder 4 to move at its upper limit on the guide slider 7, keeping the positioning spring 24 in a buffer state. After the pressure block 4 is moved to the designated installation position, one of the limiting slots 9 on the limiting cylinder 8 is aligned with the limiting insert 29. By releasing the limiting plate 27, the limiting spring 24, which was originally in a buffer state, is released. When spring 28 is reset, it can drive the limiting block 29 on the limiting plate 27 to reset and move, allowing it to pass through the guide slider 7 and connect with one of the limiting slots 9, thus lowering the limiting cylinder 8 to set the limit and completing the installation of the pressure block 4. Since there are several limiting slots 9, the pressure block 4 can be installed at different heights, reducing the limitations of the tooling. Simultaneously, after the pressure block 4 is installed, the positioning spring 24, which is in a buffer state, cannot reset. The resulting elastic force acts on the limiting cylinder 8, increasing the contact friction and strength between the limiting slot 9 and the limiting block 29, preventing the pressure block 4 from dislodging due to non-human factors during use, and improving the tooling's effectiveness. This allows the tooling to be used more efficiently. The pressure block 4 can be installed and removed quickly and without any tools, facilitating the replacement of pressure blocks 4 with different shapes. This avoids difficulties in operation due to the lack of suitable tools during the replacement process, reducing the limitations of tooling use. As a result, the tooling can be adapted to test gate valves of different shapes, ensuring that the pressure block 4 fits snugly against the outer surface of the gate valve body. This avoids missing test data and ensures accurate strength testing when the pressure block and valve body are in close contact. It also prevents test data distortion caused by excessive or insufficient pressure in local areas of the valve body during testing, thus providing a reliable basis for product quality judgment. At the same time, it also ensures the safety of subsequent use of the gate valve, ultimately reducing the testing limitations of the tooling and improving its use and testing effectiveness.

[0022] In this embodiment, the test bench 1 is also equipped with a pressure-bearing and anti-impact mechanism. The pressure-bearing and anti-impact mechanism includes a third base 30, which is installed on the opposite surfaces of two semi-ring base blocks 2; an energy-absorbing slide column 31, which is connected through the third base 30 to the side near the top of the test bench 1; the energy-absorbing slide column 31 is slidably engaged with the third base 30; a pressure-bearing square plate 32 is connected to the end of the energy-absorbing slide column 31 away from the test bench 1; the pressure-bearing square plate 32 is located below the shut-off valve; the side of the shut-off valve near the top of the test bench 1 is located on the moving path of the pressure-bearing square plate 32; the end of the energy-absorbing slide column 31 near the test bench 1 is connected to an energy-absorbing... Limiting plate 33; energy-absorbing spring 34, sleeved on energy-absorbing sliding column 31; one end of energy-absorbing spring 34 is fixedly connected to the third base 30, and the other end is fixedly connected to energy-absorbing limiting plate 33; directional cylinder 35, installed on energy-absorbing limiting plate 33; the end of directional cylinder 35 away from energy-absorbing limiting plate 33 extends through to the bottom of test bench 1; directional cylinder 35 is slidably engaged with test bench 1; directional sliding plate 36, located at the bottom of test bench 1; the side of directional sliding plate 36 near the bottom of test bench 1 is connected through to directional cylinder 35; directional cylinder 35 and directional sliding plate 36 are slidably engaged. A directional spring 37 is sleeved on a directional cylinder 35; one end of the directional spring 37 is fixedly connected to the bottom of the test bench 1, and the other end is fixedly connected to a directional sliding plate 36; an extension block 38 is installed on the directional sliding plate 36; a directional rack 39 is connected to the extension block 38; a slide rail 40 is installed on the directional rack 39; a fourth base 41 is installed at the bottom of the test bench 1; the slide rail 40 is fitted into the fourth base 41, and the two slide in a sliding fit; a fixed seat 42 is installed on a guide slider 7; a fixed pulley 43 is connected to the first base 5; and a winding roller 44... Located at the bottom of test bench 1; a rotating shaft 45 is connected to the winding roller 44; a fifth base 46 is connected to the bottom of test bench 1; the rotating shaft 45 is connected to the fifth base 46; a spring 47 is installed on the rotating shaft 45; the end of the spring 47 is fixedly connected to the fifth base 46; a cable 48 is connected at one end to the fixed seat 42, and the other end passes over the fixed pulley 43 and is wound and connected to the winding roller 44; a directional gear 49 is connected to the end of the rotating shaft 45 away from the fifth base 46; the directional gear 49 and the directional rack 39 are meshed and connected. When the guide slider 7 moves the pressure block 4 downward, the fixed seat 42 on the guide slider 7 moves downward, so that under the action of the cable 48 and the fixed pulley 43, it no longer exerts force on the spring spring 47. When it resets, it drives the winding roller 44 to reset and rotate by rotating the shaft 45, so that it winds the cable 48 onto itself, thereby driving the directional gear 49 to rotate, so that it meshes with the directional rack 39 and moves it closer to the bottom of the test bench 1. The directional rack 39 moves to the upper limit of the fourth base 41 through the slide rail 40, thereby driving the extension block 38 to move, so that the directional slide plate 36 on it moves closer to the bottom of the test bench 1. Under the action of the directional cylinder 35 and the directional spring 37, it drives the energy-absorbing limit plate 33 to move upward. The directional spring 37 is in a buffer state, so that the energy-absorbing slide column 31 on the energy-absorbing limit plate 33 moves to the upper limit of the third base 30, so that the energy-absorbing spring 34 is in a buffer state, thereby driving the pressure plate 32 to move upward, so that it contacts the bottom of the shut-off valve. While supporting the gate valve, it works in conjunction with the downward-moving pressure block 4 to apply pressure simultaneously to both the upper and lower sides of the gate valve. This reduces the testing time for single-sided pressure application, improves the testing efficiency of the fixture, and avoids dead zones in the pressure application area that prevent pressure from being applied to parts of the valve body, thereby improving the testing effect of the gate valve and ensuring the accuracy of the fixture during testing. This further enhances the effectiveness of the fixture. It is worth mentioning that the buffering force provided by the energy-absorbing spring 34 and the directional spring 37 means that when the pressure applied to the valve body cannot withstand the pressure of the test and breaks or is damaged, the force exerted by the pressure block 4 on the valve body suddenly acts on the pressure-bearing square plate 32, and the force generated when the valve body breaks also acts on the pressure-bearing square plate 32. At this time, the impact force caused by the valve body breaking can be reduced through the aforementioned buffering force, thereby increasing the service life of the fixture and improving its effectiveness, thus preventing damage to the fixture during the testing process.

[0023] This invention also provides a method for using a pressure testing fixture for a shut-off valve, comprising the following steps: S1. Place the shut-off valve on the semi-ring base block 2, so that the flanges at both ends of the shut-off valve are embedded in the semi-ring groove 3, and at the same time operate the clamping and braking device to clamp and fix the shut-off valve. S2. Start the pressure testing component and drive the pressure block 4 to move toward the valve body of the shut-off valve until the pressure block 4 is tightly attached to the outer surface of the valve body. S3. After the pressure block 4 is attached to the valve body, the pressure block 4 is controlled by the pressure measuring component to continuously apply pressure to the valve body until the pressure reaches the preset value. Observe and record whether there are cracks, deformations or damages on the surface of the shut-off valve, and complete the shut-off valve strength test.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure testing fixture for a shut-off valve, comprising a test bench; characterized in that: Two symmetrical semi-annular base blocks are installed on the top of the test bench. Clamping and braking devices are provided on the semi-annular base blocks to prevent the shut-off valve from shifting position during testing and affecting the test results. Each clamping and braking device includes a semi-annular groove disposed within the semi-annular base block, with both grooves having coaxial centers. The two ends of the semi-annular groove extend to the two ends of the semi-annular base block. The two semi-annular grooves are located within the movement path of the flanges at both ends of the shut-off valve, with the flanges and semi-annular grooves fitting together and having coaxial centers. A pressure testing assembly is provided on the test bench for performing strength tests on the shut-off valve. The pressure testing assembly includes a pressure block located on the top of the test bench. The first base is installed on both sides of the test bench; Guide cylinder, connected to the top of the first base; The guide slider is connected to the guide cylinder through the side near the test bench; the guide cylinder and the guide slider are in sliding fit. A limit-connection replacement unit is disposed on the guide slider; the limit-connection replacement unit is used to conveniently replace pressure blocks of different shapes; the limit-connection replacement unit includes a limiting cylinder, which is installed on the side of the pressure block near the test bench; the limiting cylinder is connected through the guide slider on the side away from the test bench; the guide slider and the limiting cylinder are in sliding cooperation; the outer wall of the limiting cylinder is provided with a number of equidistantly arranged limiting slots.

2. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a movable lead screw, installed on the back side of the two semi-ring base blocks; A drive source is mounted on a semi-ring base block; the output end of the drive source is connected to a position screw. The positioning block is threadedly connected to the positioning screw; The movable cylinder is mounted on the semi-ring base block; the movable block is connected to the movable cylinder through the side of the semi-ring base block; the movable cylinder and the movable block are in sliding fit.

3. The pressure testing fixture for a shut-off valve according to claim 2, characterized in that: Includes a braking circular block, connected to the displacement block; The brake cylinder is connected through the brake block to the side of the flange near the end of the shut-off valve; the brake block and the brake cylinder are in sliding fit. Brake limit plate, connected to the end of brake cylinder away from flange; Brake clamp, connected to the end of the brake cylinder near the flange; The flange is located on the movement path of the brake clamp; A brake spring is sleeved on a brake cylinder; one end of the brake spring is fixedly connected to a brake limiting plate, and the other end is fixedly connected to a brake block; a brake lever is also installed on the brake block; the screw hole on the flange is located on the movement path of the brake lever; a brake pin is also installed on the side of the brake clamp away from the brake cylinder; the medium flow hole on the flange is located on the movement path of the brake pin; the medium flow hole and the brake pin are fitted together.

4. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a telescopic cylinder, installed on the top of the test bench; A U-shaped connecting plate is attached to the output end of the telescopic cylinder; both ends of the U-shaped connecting plate are connected to two guide sliders.

5. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: It includes a positioning cylinder that runs through and connects to the guide slider on the side near the test bench; the positioning cylinder and the guide slider are in sliding engagement. A positioning horizontal plate is installed at the end of the positioning cylinder near the test bench. A positioning spring is sleeved on a positioning cylinder; one end of the positioning spring is fixedly connected to a guide slider, and the other end is fixedly connected to a positioning horizontal plate; the side of the positioning horizontal plate away from the top of the test bench is located on the moving path of the limiting cylinder near the top of the test bench.

6. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a second base, installed on both sides of the guide slider; A limiting slide rod is connected through the side of the second base; the second base and the limiting slide rod are slidably engaged; one end of the limiting slide rod is connected to a limiting circular plate, and the other end is connected to a limiting horizontal plate; the limiting horizontal plate is located on the side of the limiting slot. A limiting spring is sleeved on a limiting slide rod; one end of the limiting spring is fixedly connected to a limiting circular plate, and the other end is fixedly connected to a second base. The limiting block is installed on the side of the limiting plate near the limiting slot; when the limiting cylinder reaches the designated position, the limiting block passes through the side of the guide slider and connects with one of the limiting slots.

7. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: The test bench is also equipped with a pressure-bearing and anti-impact mechanism; the pressure-bearing and anti-impact mechanism includes a third base, which is installed on the opposite surfaces of two semi-ring base blocks; An energy-absorbing sliding column is connected through the third base to the side near the top of the test bench; the energy-absorbing sliding column is slidably fitted with the third base; a pressure-bearing square plate is connected to the end of the energy-absorbing sliding column away from the test bench; the pressure-bearing square plate is located below the shut-off valve; the side of the shut-off valve near the top of the test bench is located on the moving path of the pressure-bearing square plate; an energy-absorbing limiting plate is connected to the end of the energy-absorbing sliding column near the test bench. An energy-absorbing spring is sleeved on an energy-absorbing sliding column; one end of the energy-absorbing spring is fixedly connected to the third base, and the other end is fixedly connected to the energy-absorbing limiting plate.

8. The pressure testing fixture for a shut-off valve according to claim 7, characterized in that: Includes a directional cylinder mounted on an energy-absorbing limiting plate; one end of the directional cylinder, away from the energy-absorbing limiting plate, extends through to the bottom of the test bench; the directional cylinder is slidably fitted with the test bench; A directional sliding plate is located at the bottom of the test bench; the side of the directional sliding plate near the bottom of the test bench is connected to a directional cylinder. The directional cylinder and the directional sliding plate slide together. A directional spring is sleeved on a directional cylinder; one end of the directional spring is fixedly connected to the bottom of the test bench, and the other end is fixedly connected to a directional sliding plate; an extension block is installed on the directional sliding plate; a directional rack is connected to the extension block; A slide rail is installed on the directional rack; a fourth base is installed at the bottom of the test bench; the slide rail is fitted into the fourth base, and the two slide together.

9. The pressure testing fixture for a shut-off valve according to claim 8, characterized in that: Includes a retaining seat, mounted on the guide slider; A fixed pulley is connected to the first base; A winding roller is located at the bottom of the test bench; a rotating shaft is connected to the winding roller. The fifth base is connected to the bottom of the test bench; the rotating shaft is connected to the fifth base; a spring is installed on the rotating shaft; the end of the spring is fixedly connected to the fifth base; One end of the cable is connected to the fixed seat, and the other end is wrapped around the winding roller after passing over the fixed pulley. A directional gear is connected to the end of the rotating shaft away from the fifth base; the directional gear and the directional rack are meshed together.

10. A method of using a pressure testing fixture for a gate valve, comprising using the pressure testing fixture for a gate valve as described in claim 1, characterized in that, Including the following steps: S1. Place the shut-off valve on the semi-ring base block, so that the flanges at both ends of the shut-off valve are embedded in the semi-ring groove, and at the same time operate the clamping and braking device to clamp and fix the shut-off valve. S2. Activate the pressure testing component to drive the pressure block to move toward the valve body of the shut-off valve until the pressure block is tightly attached to the outer surface of the valve body. S3. After the pressure block is in contact with the valve body, the pressure block is continuously applied to the valve body by the pressure testing component until the pressure reaches the preset value. Observe and record whether there are cracks, deformations or damages on the surface of the shut-off valve to complete the shut-off valve strength test.

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