Device and method for testing pressure resistance of stainless steel pipe

Abstract

The invention belongs to the technical field of stainless steel pipe production, and provides a stainless steel pipe pressure resistance testing device and a testing method.The testing device comprises a water tank, a lifting plate is arranged in the water tank, two sets of moving frames of frame structures are slidably installed on the lifting plate, and two sets of clamping plates are slidably installed on the moving frames; and a servo module for driving the two groups of clamping plates to move reversely at the same time is arranged on the movable frame, so that the technical problem that the accuracy of the pressure resistance test of the stainless steel pipe is influenced due to the fact that the stainless steel pipe can bear pressure in the prior art is solved. And then the cover plate is pressed on the end face of the stainless steel pipe to seal the end of the stainless steel pipe, when the cover plate seals the end of the stainless steel pipe, acting force cannot be generated on the positions, except the end, of the whole stainless steel pipe, and the pressure measuring device can be widely applied to the tubular object pressure measuring scene.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel pipe production, and in particular relates to a stainless steel pipe pressure resistance performance testing device and a testing method thereof. Background Art

[0002] Stainless steel pipe fittings are a general term for various stainless steel pipe connection workpieces. They are made of stainless steel and can be divided into different categories according to shape, purpose, connection method, etc. They are widely used in various pipeline construction and installation. At the same time, high-pressure resistant stainless steel pipes are also the direction of improved design. Therefore, after the production of stainless steel pipes is completed, in order to ensure whether they meet the use requirements, they need to be tested for pressure resistance.

[0003] The existing pressure resistance test includes passing air or water into the stainless steel pipe for testing. However, when the air is passed for pressure testing, it is not easy to find that the stainless steel pipe is deformed under pressure or there is a gap at the connection between the stainless steel pipe and the test structure, which causes air leakage. Adding water for testing requires the use of a water pump, and it is also difficult to deal with water after leakage. This makes it extremely inconvenient to test the pressure resistance performance of the stainless steel pipe, and thereby reduces the testing efficiency of the stainless steel pipe. In response to the above technical problems, the applicant has retrieved some prior art, such as the Chinese patent with patent announcement number CN116106131A, in which the sliding plate and the connecting plate apply pressure from both ends of the stainless steel pipe to fix the stainless steel pipe and seal the end of the stainless steel pipe when in use. However, when closing the end of the stainless steel pipe, the sliding plate and the connecting plate need to apply greater pressure, so that the stainless steel pipe itself will be under pressure, which will affect the accuracy of the pressure resistance test of the stainless steel pipe in subsequent tests. Summary of the invention

[0004] The purpose of the present invention is to provide a stainless steel pipe pressure resistance performance testing device and a testing method thereof, aiming to solve the technical problem in the prior art that the stainless steel pipe itself will be subjected to pressure, which affects the accuracy of the pressure resistance test of the stainless steel pipe.

[0005] The present invention is implemented as follows: a device for testing the pressure resistance of a stainless steel pipe comprises a water tank, a lifting plate is arranged in the water tank, two sets of frame-shaped moving frames are slidably mounted on the lifting plate, two sets of clamping plates are slidably mounted on the moving frames, a servo module is arranged on the moving frames for driving the two sets of clamping plates to move in opposite directions at the same time, a cover plate is arranged on one side of the two sets of moving frames away from each other, and a second telescopic member for driving the cover plate to move is fixedly mounted on the moving frames;

[0006] A mounting block is provided in the middle of the cover plate, and two groups of top blocks are provided on the mounting block and are distributed on the same vertical line. The two groups of top blocks point to the two groups of clamping plates respectively, and the surface of the top block away from the mounting block is an arc structure. A power assembly for driving the two groups of top blocks to move is provided on the mounting block, and the top blocks and the corresponding clamping plates clamp the side wall of the stainless steel pipe;

[0007] A gas pressurizing device body is fixedly installed outside the water tank, and a pressurizing pipe is connected to the output end of the gas pressurizing device body. The pressurizing pipe is fixedly connected to one set of cover plates and the pressurizing pipe runs through the cover plates. An air pressure sensor is fixedly installed on the cover plates connected to the pressurizing pipe.

[0008] Further technical solution: A placement plate is fixedly installed in the middle of the lifting plate, the placement plate is a Y-shaped structure, and the vertical symmetry plane of the placement plate coincides with the vertical symmetry plane of the top block.

[0009] Further technical solution: A guide frame for guiding the mobile frame is fixedly installed on the lifting plate, a first telescopic member is fixedly installed at the water tank opening, the first telescopic member points to the bottom surface of the water tank and the output end of the first telescopic member is fixedly connected to the lifting plate.

[0010] Further technical solution: the clamping plates are slidably mounted on the vertical section of the moving frame, and the two groups of clamping plates are symmetrically distributed about the symmetry plane of the vertical section of the moving frame.

[0011] Further technical solution: the cover plate is parallel to the movable frame and the cover plate and the movable frame move along the same straight line. A sealing gasket with an annular structure is fixedly installed on the side of the cover plate close to the movable frame. The center of the sealing gasket and the center of the movable frame are both located on the same straight line perpendicular to the cover plate.

[0012] Further technical solution: two groups of guide rods are fixedly installed in the middle of the cover plate, the mounting block is slidably installed on the guide rods, two groups of second elastic parts are fixedly installed on the cover plate, the end of the second elastic part away from the cover plate is fixedly connected to the mounting block, the second elastic part is in a compressed state and the mounting block is in conflict with the end of the guide rod away from the cover plate.

[0013] Further technical solution: the power assembly includes a sliding rod, which is provided with two groups and is slidably installed on a mounting block. A mounting groove is provided on the mounting block. The two groups of sliding rods are distributed in a vertical line and extend into the mounting groove. One end of the sliding rod outside the mounting groove is fixedly connected to the corresponding top block. The two groups of sliding rods are connected by a third telescopic member, and the third telescopic member is distributed along the length direction of the sliding rod.

[0014] Further technical solution: Two groups of first elastic members arranged around the slide bar are fixedly installed on the two side walls inside the installation groove, and the ends of the first elastic members are fixedly connected to the ends of the slide bar located in the installation groove.

[0015] The present invention also provides a testing method for a stainless steel pipe pressure resistance performance testing device, which is applied to the above-mentioned stainless steel pipe pressure resistance performance testing device, and comprises the following steps:

[0016] Step S1: Add water into the water tank and make the liquid level reach a set height, and drive the lifting plate upward through the first telescopic member so that the vertical section of the placement plate is exposed to the water surface, and then the stainless steel pipe to be tested can be placed on the placement plate;

[0017] Step S2: pushing the moving frame to move so that the cover plate contacts the end surface of the stainless steel pipe, and driving the two groups of top blocks to move simultaneously through the power assembly, so that the two groups of top blocks contact the upper and lower inner walls of the stainless steel pipe respectively;

[0018] Step S3: The servo module drives the two sets of clamps to move toward each other, and the two sets of clamps clamp the end of the stainless steel tube. Then, the second telescopic member contracts to drive the cover plate to press against the end surface of the stainless steel tube to seal the end of the stainless steel tube.

[0019] Step S4: The first telescopic member drives the lifting plate to move downward so that the stainless steel pipe is completely immersed in water. The gas pressurizing equipment body conveys gas to the stainless steel pipe through the pressurizing pipe to increase the air pressure in the stainless steel pipe. The air pressure in the stainless steel pipe is detected by the air pressure sensor. After the test is completed, the stainless steel pipe can be replaced.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The end of the stainless steel pipe is clamped by the top block and the clamping plate, and then the second telescopic member contracts to drive the cover plate to press against the end surface of the stainless steel pipe to close the end of the stainless steel pipe. Since the movable frame is connected to the end of the stainless steel pipe, the cover plate is driven by the second telescopic member installed on the movable frame. Therefore, when the cover plate applies pressure to the end of the stainless steel pipe, a reaction force will appear at the position where the stainless steel pipe is connected to the movable frame, that is, when the cover plate closes the end of the stainless steel pipe, the force-bearing area of ​​the stainless steel pipe is the connection between the stainless steel pipe and the movable frame and the area outside the movable frame, that is, when the cover plate closes the end of the stainless steel pipe, no force will be generated on the entire stainless steel pipe except the end, thereby avoiding the interference of additional force on the pressure test result of the stainless steel pipe, thereby ensuring the accuracy of the pressure test result.

[0022] 2. When the stainless steel pipe is clamped and fixed by the top block and the clamping plate, since the two groups of top blocks are distributed in a vertical line, and the vertical symmetry plane of the placement plate coincides with the vertical symmetry plane of the top block, the points where the top block contacts the inner wall of the stainless steel pipe are the two end points of the vertical diameter of the stainless steel pipe. At this time, the top block not only realizes the connection between the mounting block and the stainless steel pipe, but also can automatically position the stainless steel pipe to ensure that the contact positions of the top block and the clamping plate with the side wall of the stainless steel pipe coincide when the top block and the clamping plate clamp the side wall of the stainless steel pipe, thereby avoiding damage to the stainless steel pipe during the clamping process, ensuring the stability of the stainless steel pipe clamping, further improving the effect of the cover plate sealing the end of the stainless steel pipe, and improving the accuracy of the pressure test results of the stainless steel pipe.

[0023] 3. Since the ends of the stainless steel pipe are separated by cutting, the strength of the end of the stainless steel pipe decreases under the influence of high temperature and cutting. The pressure on the end of the stainless steel pipe when closed by the cover plate can enhance the strength of the end of the stainless steel pipe, reduce the probability of deformation of the end of the stainless steel pipe during the test, and further improve the accuracy of the pressure test results of the stainless steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the structure inside the water tank of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the lifting plate in the present invention.

[0027] Figure 4 It is a structural schematic diagram of the mobile rack in the present invention.

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the mobile frame in the present invention.

[0029] Figure 6 for Figure 5 A magnified schematic diagram of the A1 region in the middle.

[0030] Figure 7 It is a structural schematic diagram of the installation block in the present invention.

[0031] Figure 8 It is a structural schematic diagram of the installation slot in the present invention.

[0032] In the attached drawings: 1. water tank; 2. lifting plate; 3. first telescopic member; 4. guide frame; 5. placement plate; 6. moving frame; 7. clamping plate; 8. servo module; 9. cover plate; 10. second telescopic member; 11. sealing gasket; 12. mounting block; 13. mounting groove; 14. sliding rod; 15. top block; 16. first elastic member; 17. third telescopic member; 18. guide rod; 19. second elastic member; 20. pressurized pipe; 21. gas pressurized equipment body; 22. air pressure sensor; 23. power assembly. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0035] like Figure 1-Figure 8 As shown, a pressure resistance performance testing device for a stainless steel pipe provided by the present invention comprises a water tank 1, a lifting plate 2 is arranged in the water tank 1, two groups of frame-shaped moving frames 6 are slidably mounted on the lifting plate 2, a guide frame 4 for guiding the moving frame 6 is fixedly mounted on the lifting plate 2, a first telescopic member 3 is fixedly mounted at the opening of the water tank 1, the first telescopic member 3 points to the bottom surface of the water tank 1 and the output end of the first telescopic member 3 is fixedly connected to the lifting plate 2, two groups of clamping plates 7 are slidably mounted on the moving frame 6, the clamping plates 7 are slidably mounted on the vertical section of the moving frame 6, the two groups of clamping plates 7 are symmetrically distributed about the symmetric plane of the vertical section of the moving frame 6, a servo module 8 for driving the two groups of clamping plates 7 to move in opposite directions at the same time is arranged on the moving frame 6, a cover plate 9 is arranged on the side away from each other of the two groups of moving frames 6, and a second telescopic member 10 for driving the cover plate 9 to move is fixedly mounted on the moving frame 6;

[0036] A mounting block 12 is provided in the middle of the cover plate 9, and two groups of top blocks 15 distributed on the same vertical line are provided on the mounting block 12. The two groups of top blocks 15 point to the two groups of clamping plates 7 respectively, and the surface of the top block 15 away from the mounting block 12 is an arc structure. A power assembly 23 for driving the two groups of top blocks 15 to move is provided on the mounting block 12. The top block 15 and the corresponding clamping plate 7 clamp the side wall of the stainless steel pipe. A placement plate 5 is fixedly installed in the middle of the lifting plate 2. The placement plate 5 is a Y-shaped structure, and the vertical symmetry plane of the placement plate 5 coincides with the vertical symmetry plane of the top block 15.

[0037] A gas pressurizing device body 21 is fixedly installed on the outside of the water tank 1, and a pressurizing pipe 20 is connected to the output end of the gas pressurizing device body 21. The pressurizing pipe 20 is fixedly connected to one set of cover plates 9 and the pressurizing pipe 20 passes through the cover plates 9. An air pressure sensor 22 is fixedly installed on the cover plates 9 connected to the pressurizing pipe 20.

[0038] In actual application of this embodiment, water is added to the water tank 1 and the liquid level reaches a set height. During detection, the lifting plate 2 is driven upward by the first telescopic member 3 so that the vertical section of the placement plate 5 is exposed to the water surface. Then, the stainless steel pipe to be tested can be placed on the placement plate 5. At this time, the stainless steel pipe is located in the area between the upper and lower clamping plates 7. The position of the cover plate 9 is adjusted by the second telescopic member 10. The cover plate 9 drives the top block 15 to move through the mounting block 12, so that the top block 15 moves to a position aligned with the clamping plate 7 in the vertical plane, and the moving frame 6 is pushed. The cover plate 9 is moved so as to contact the end face of the stainless steel pipe. At this time, the top block 15 and the mounting block 12 enter the stainless steel pipe. The power assembly 23 drives the two groups of top blocks 15 to move simultaneously, so that the two groups of top blocks 15 contact the upper and lower inner walls of the stainless steel pipe respectively. Since the vertical symmetry plane of the placement plate 5 coincides with the vertical symmetry plane of the top block 15, the points where the top block 15 contacts the inner wall of the stainless steel pipe are the two end points of the diameter of the stainless steel pipe in the vertical direction. Therefore, the two groups of top blocks 15 can complete the positioning of the stainless steel pipe and connect the stainless steel pipe to the mounting block 12.

[0039] Afterwards, the two groups of clamps 7 are driven by the servo module 8 to move toward each other. When the lower clamp 7 contacts the lower surface of the stainless steel tube, the stainless steel tube can be pushed upward. When the upper clamp 7 also contacts the stainless steel tube, the end of the stainless steel tube can be clamped by the two groups of clamps 7. At this time, the contact positions of the top block 15 and the clamp 7 are the same as the stainless steel tube, and the top block 15 and the clamp 7 are located on both sides of the position, which can stably clamp the stainless steel tube to avoid damage to the stainless steel tube during the clamping process and ensure the stability of the stainless steel tube clamping. Afterwards, the second telescopic member 10 contracts and drives the cover plate 9 to press on the end surface of the stainless steel tube to close the end of the stainless steel tube. Since the movable frame 6 is connected to the end of the stainless steel tube, the cover plate 9 is driven by the second telescopic member 10 installed on the movable frame 6, so that the cover plate 9 applies pressure to the end of the stainless steel tube. When the cover plate 9 is closed, a reaction force will appear at the position where the stainless steel pipe is connected to the movable frame 6, that is, when the cover plate 9 closes the end of the stainless steel pipe, the force-bearing area of ​​the stainless steel pipe is the connection between the stainless steel pipe and the movable frame 6 and the area outside the movable frame 6, that is, when the cover plate 9 closes the end of the stainless steel pipe, no force will be generated on the entire stainless steel pipe except the end, thereby avoiding the interference of additional force on the pressure test result of the stainless steel pipe, ensuring the accuracy of the pressure test result, and because the port of the stainless steel pipe is separated by cutting, the strength of the end of the stainless steel pipe decreases under the influence of high temperature and cutting, and the pressure generated on the end of the stainless steel pipe when the cover plate 9 is closed can enhance the strength of the end of the stainless steel pipe, reduce the probability of the stainless steel pipe end being deformed first during the test, and further improve the accuracy of the pressure test result of the stainless steel pipe;

[0040] After the stainless steel pipe is clamped and the end is closed, the first telescopic member 3 drives the lifting plate 2 to move downward so that the stainless steel pipe is completely immersed in water. At this time, the gas pressurizing equipment body 21 transports gas to the stainless steel pipe through the pressurizing pipe 20, increasing the air pressure in the stainless steel pipe. The air pressure in the stainless steel pipe is detected by the air pressure sensor 22. The detection pressure of the air pressure sensor 22 is the pressure that the stainless steel pipe bears. If the stainless steel pipe is damaged or deformed, bubbles will be generated in the water. At the same time, the pressure detected by the air pressure sensor 22 will drop. The stainless steel pipe can be taken out and replaced with a new one for testing.

[0041] In an example of this embodiment, the first telescopic member 3 is a first electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder, and the lifting plate 2 is driven to move up and down by the first electric telescopic rod.

[0042] like Figure 3-Figure 6 As shown, a pressure resistance performance testing device for a stainless steel pipe provided by the present invention is provided, wherein the cover plate 9 is parallel to the movable frame 6 and the cover plate 9 and the movable frame 6 move along the same straight line, and a sealing gasket 11 with an annular structure is fixedly installed on the side of the cover plate 9 close to the movable frame 6, and the center of the sealing gasket 11 and the center of the movable frame 6 are distributed on the same straight line perpendicular to the cover plate 9.

[0043] Specifically, two groups of guide rods 18 are fixedly installed in the middle of the cover plate 9, and the mounting block 12 is slidably installed on the guide rods 18. Two groups of second elastic members 19 are fixedly installed on the cover plate 9. The end of the second elastic member 19 away from the cover plate 9 is fixedly connected to the mounting block 12. The second elastic member 19 is in a compressed state and the mounting block 12 is in conflict with the end of the guide rod 18 away from the cover plate 9.

[0044] In actual application of this embodiment, under the action of the second elastic member 19, the mounting block 12 is always located at the end of the guide rod 18 away from the cover plate 9, and the mounting block 12 is fixed under the restriction of the second elastic member 19 and the guide rod 18. When the movable frame 6 is subsequently installed to connect with the stainless steel pipe, the position of the cover plate 9 is first adjusted by the second telescopic member 10, and the cover plate 9 drives the top block 15 to move through the mounting block 12, so that the top block 15 moves to a position aligned with the clamping plate 7, and then when the stainless steel pipe wall is subsequently clamped, the top block 15 can cooperate with the clamping plate 7 to clamp from the inside and outside of the stainless steel pipe, thereby ensuring the stability of the connection between the movable frame 6 and the stainless steel pipe and preventing the stainless steel pipe from being damaged during clamping.

[0045] Since the center of the sealing gasket 11 and the center of the movable frame 6 are located on the same straight line perpendicular to the cover plate 9, and the two sets of clamping plates 7 are symmetrically distributed about the symmetry plane of the vertical section of the movable frame 6, when the stainless steel pipe is clamped and fixed, the stainless steel pipe and the sealing gasket 11 are coaxially arranged, thereby ensuring that the end of the stainless steel pipe is in contact with the sealing gasket 11.

[0046] In an example of the present invention, the second elastic member 19 is a second spring, and may also be other elastic members such as an elastic ball. The second spring is compressed to apply thrust to the mounting block 12, thereby fixing the position of the mounting block 12.

[0047] like Figure 7-Figure 8 As shown, a pressure resistance performance testing device for a stainless steel pipe provided by the present invention, the power assembly 23 includes a slide bar 14, the slide bar 14 is provided with two groups and is slidably installed on a mounting block 12, a mounting groove 13 is provided on the mounting block 12, the two groups of slide bars 14 are distributed in a vertical line and extend into the mounting groove 13, one end of the slide bar 14 outside the mounting groove 13 is fixedly connected to the corresponding top block 15, the two groups of slide bars 14 are connected by a third telescopic member 17, and the third telescopic member 17 is distributed along the length direction of the slide bar 14.

[0048] Specifically, two groups of first elastic members 16 arranged around the slide bar 14 are fixedly installed on both side walls of the installation groove 13 , and ends of the first elastic members 16 are fixedly connected to ends of the slide bar 14 located in the installation groove 13 .

[0049] When this embodiment is actually used, after the end of the stainless steel tube contacts the sealing gasket 11, the stainless steel tube is located between the two groups of clamping plates 7 and the mounting block 12 and the top block 15 are located inside the stainless steel tube. At this time, the third telescopic member 17 is extended to make the two groups of slide bars 14 move away from each other. When the two groups of first elastic members 16 are both in a compressed state, a balanced state will be reached. Then, when the third telescopic member 17 is extended to make the two groups of slide bars 14 move away from each other, the two groups of first elastic members 16 will adjust the positions of the slide bars 14 in the mounting groove 13, so that the two groups of slide bars 14 extend outward at the same time. After one group of top blocks 15 contacts the inner wall of the stainless steel tube, the third telescopic member 17 continues to extend. At this time, the top blocks 15 of this group maintain contact with the inner wall of the stainless steel tube, and the other group of top blocks 15 will continue to move toward the inner wall of the stainless steel tube. After the top blocks 15 of the two groups are in contact with the inner wall of the stainless steel tube, the third telescopic member 17 stops moving. Since the two groups of top blocks 15 are distributed on a vertical line, and the vertical symmetry plane of the placement plate 5 coincides with the vertical symmetry plane of the top block 15, the points where the top block 15 contacts the inner wall of the stainless steel tube are the two end points of the diameter of the stainless steel tube in the vertical direction. At this time, the top block 15 not only realizes the connection between the mounting block 12 and the stainless steel tube, but also can automatically position the stainless steel tube, ensuring that the contact positions of the top block 15 and the clamping plate 7 when clamping the side wall of the stainless steel tube coincide with each other, avoiding damage to the stainless steel tube during the clamping process, ensuring the stability of the stainless steel tube clamping, and further improving the sealing effect of the cover plate 9 on the end of the stainless steel tube. The subsequent contraction of the third telescopic member 17 can release the fixation of the stainless steel tube.

[0050] The two groups of first elastic members 16 respectively apply pulling force and pushing force to the upper and lower slide bars 14 to maintain the position of the slide bars 14, thereby preventing the lower slide bars 14 from completely extending out of the mounting block 12 and reducing the extension amount of the slide bars 14, thereby ensuring that the mounting block 12 and the top block 15 can smoothly enter the stainless steel pipe.

[0051] In one embodiment of the present invention, the third telescopic member 17 is a third electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder. The two groups of top blocks 15 are driven to move by the third electric telescopic rod, thereby completing the positioning and clamping of the stainless steel pipe. The first elastic member 16 is a first spring, and of course it can also be other elastic components such as an elastic ball. The first spring applies a force to the slide rod 14, thereby adjusting the position of the slide rod 14.

[0052] like Figure 1-Figure 6 As shown, a test method for a stainless steel pipe pressure resistance performance test device provided by the present invention is applied to the above-mentioned stainless steel pipe pressure resistance performance test device, and comprises the following steps:

[0053] Step S1: Add water into the water tank 1 and make the liquid level reach a set height, and drive the lifting plate 2 to move upward through the first telescopic member 3 so that the vertical section of the placement plate 5 is exposed to the water surface, and then the stainless steel pipe to be tested can be placed on the placement plate 5;

[0054] Step S2: Push the moving frame 6 to move so that the cover plate 9 contacts the end surface of the stainless steel pipe, and drive the two groups of top blocks 15 to move simultaneously through the power assembly 23, so that the two groups of top blocks 15 contact the upper and lower inner walls of the stainless steel pipe respectively;

[0055] Step S3: The servo module 8 drives the two groups of clamps 7 to move toward each other, and the two groups of clamps 7 clamp the end of the stainless steel tube, and then the second telescopic member 10 contracts to drive the cover plate 9 to press against the end surface of the stainless steel tube to seal the end of the stainless steel tube;

[0056] Step S4: The first telescopic member 3 drives the lifting plate 2 to move downward so that the stainless steel pipe is completely immersed in water. The gas pressurizing equipment body 21 transports gas into the stainless steel pipe through the pressurizing pipe 20 to increase the air pressure in the stainless steel pipe. The air pressure in the stainless steel pipe is detected by the air pressure sensor 22. After the test is completed, the stainless steel pipe can be replaced.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A stainless steel pipe pressure resistance performance testing device, comprising a water tank (1), characterized in that: A lifting plate (2) is arranged in the water tank (1), two groups of frame-shaped moving frames (6) are slidably mounted on the lifting plate (2), two groups of clamping plates (7) are slidably mounted on the moving frames (6), a servo module (8) is arranged on the moving frames (6) for driving the two groups of clamping plates (7) to move in opposite directions simultaneously, a cover plate (9) is arranged on the side of the two groups of moving frames (6) that are away from each other, and a second telescopic member (10) is fixedly mounted on the moving frames (6) for driving the cover plate (9) to move; A mounting block (12) is arranged in the middle of the cover plate (9), and two groups of top blocks (15) are arranged on the mounting block (12) and are distributed on the same vertical line. The two groups of top blocks (15) point to the two groups of clamping plates (7) respectively, and the surface of the top blocks (15) away from the mounting block (12) is an arc-shaped structure. A power assembly (23) is arranged on the mounting block (12) for driving the two groups of top blocks (15) to move. The top blocks (15) and the corresponding clamping plates (7) clamp the side walls of the stainless steel pipe. A gas pressurizing device body (21) is fixedly mounted on the outside of the water tank (1); an output end of the gas pressurizing device body (21) is connected to a pressurizing pipe (20); the pressurizing pipe (20) is fixedly connected to one set of cover plates (9) and the pressurizing pipe (20) passes through the cover plates (9); and an air pressure sensor (22) is fixedly mounted on the cover plates (9) connected to the pressurizing pipe (20).

2. A stainless steel pipe pressure resistance performance testing device according to claim 1, characterized in that: A placement plate (5) is fixedly installed in the middle of the lifting plate (2); the placement plate (5) is a Y-shaped structure, and the vertical symmetry plane of the placement plate (5) coincides with the vertical symmetry plane of the top block (15).

3. A stainless steel pipe pressure resistance testing device according to claim 2, characterized in that: A guide frame (4) for guiding the moving frame (6) is fixedly mounted on the lifting plate (2), and a first telescopic member (3) is fixedly mounted at the opening of the water tank (1), the first telescopic member (3) points to the bottom surface of the water tank (1), and the output end of the first telescopic member (3) is fixedly connected to the lifting plate (2).

4. A stainless steel pipe pressure resistance performance testing device according to claim 1, characterized in that: The clamping plates (7) are slidably mounted on the vertical section of the moving frame (6), and the two groups of clamping plates (7) are symmetrically distributed about the symmetry plane of the vertical section of the moving frame (6).

5. A stainless steel pipe pressure resistance testing device according to claim 1, characterized in that: The cover plate (9) is parallel to the movable frame (6) and the cover plate (9) and the movable frame (6) move along the same straight line. A sealing gasket (11) with an annular structure is fixedly installed on the side of the cover plate (9) close to the movable frame (6), and the center of the sealing gasket (11) and the center of the movable frame (6) are both located on the same straight line perpendicular to the cover plate (9).

6. A stainless steel pipe pressure resistance performance testing device according to claim 5, characterized in that: Two groups of guide rods (18) are fixedly installed in the middle of the cover plate (9), and the mounting block (12) is slidably installed on the guide rods (18). Two groups of second elastic members (19) are fixedly installed on the cover plate (9), and one end of the second elastic member (19) away from the cover plate (9) is fixedly connected to the mounting block (12). The second elastic member (19) is in a compressed state and the mounting block (12) is in contact with one end of the guide rod (18) away from the cover plate (9).

7. A stainless steel pipe pressure resistance performance testing device according to claim 1, characterized in that: The power assembly (23) comprises a slide bar (14), wherein the slide bar (14) is provided with two groups and is slidably mounted on a mounting block (12), a mounting groove (13) is provided on the mounting block (12), the two groups of slide bars (14) are distributed on a vertical line and extend into the mounting groove (13), one end of the slide bar (14) located outside the mounting groove (13) is fixedly connected to a corresponding top block (15), the two groups of slide bars (14) are connected by a third telescopic member (17), and the third telescopic member (17) is distributed along the length direction of the slide bar (14).

8. A stainless steel pipe pressure resistance testing device according to claim 7, characterized in that: Two groups of first elastic members (16) arranged around the slide bar (14) are fixedly installed on the inner side walls of the installation groove (13), and the ends of the first elastic members (16) are fixedly connected to the ends of the slide bar (14) located in the installation groove (13).

9. A test method for a stainless steel pipe pressure resistance test device, characterized in that: A stainless steel pipe pressure resistance performance testing device as claimed in any one of claims 1 to 8, comprising the following steps: Step S1: Add water into the water tank (1) and make the liquid level reach a set height, and drive the lifting plate (2) to move upwards through the first telescopic member (3) so that the vertical section of the placement plate (5) is exposed above the water surface, and then the stainless steel pipe to be tested can be placed on the placement plate (5); Step S2: pushing the moving frame (6) to move so that the cover plate (9) contacts the end surface of the stainless steel pipe, and driving the two groups of top blocks (15) to move simultaneously through the power assembly (23), so that the two groups of top blocks (15) contact the upper and lower inner walls of the stainless steel pipe respectively; Step S3: The servo module (8) drives the two groups of clamping plates (7) to move toward each other, and the two groups of clamping plates (7) clamp the end of the stainless steel tube, and then the second telescopic member (10) contracts to drive the cover plate (9) to press against the end surface of the stainless steel tube to seal the end of the stainless steel tube; Step S4: The first telescopic member (3) drives the lifting plate (2) to move downward so that the stainless steel pipe is completely immersed in water. The gas pressurizing device body (21) delivers gas to the stainless steel pipe through the pressurizing pipe (20) to increase the air pressure in the stainless steel pipe. The air pressure in the stainless steel pipe is detected by the air pressure sensor (22). After the test is completed, the stainless steel pipe can be replaced.

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