A device for testing the compressive performance of metal pipes

Abstract

The invention relates to the technical field of pipe compression resistance detection, and discloses a metal pipe compression resistance performance detection device, comprising an operating table, a fixed seat is installed on the operating table, two fixed rings are slidably installed on the fixed seat, each fixed ring is provided with a plurality of limiters for fixing the pipe, a hydraulic mechanism is arranged on the top of the operating table, a pressure plate is fixedly installed on the output end of the hydraulic mechanism, and the pipe compression resistance detection device uses balls to detect the flatness of the pipe surface, and through the connection between the elastic rod and the fixed rod, all the second magnetic strips will always keep in the guide groove for synchronous movement, the unevenness of the pipe surface will cause a single or a few balls to move, and most of the balls drive the first magnetic strip to remain stationary in the guide groove, so that the single or a few balls drive the corresponding first magnetic strip to separate from the second magnetic strip, the telescopic plate will extend and push the annular plate and the magnetic plate, so that the magnetic plate is no longer aligned with the marking block, and the marking block moves toward the pipe under the elastic force of the compression rod and marks the pipe surface.

Description

Technical Field

[0001] The invention relates to the technical field of pipe compression resistance detection, and in particular to a metal pipe compression resistance performance detection device. Background Art

[0002] The metal pipe compressive performance testing device is an instrument specially used to test the compressive performance of metal pipes. It can evaluate the compressive performance of pipes under specific conditions by applying pressure to metal pipes and measuring their response. The compressive strength test is to evaluate the maximum pressure value that metal pipes can withstand when subjected to pressure perpendicular to their axial direction. During the test, a special clamp is used to fix the pipe on the testing device, and a gradually increasing pressure is applied through a hydraulic system or a pneumatic system until the pipe is damaged. The pressure value at this time is recorded, which is the compressive strength of the pipe. Metal pipes are important structural parts and connectors, and their compressive performance is directly related to the safety and reliability of the product. Using this testing device to test the compressive performance of metal pipes is an important means to ensure product quality and safety.

[0003] It is inevitable that metal pipes will be bumped during production and transportation. Bumps will cause damage to the surface of the pipe and destroy the complete structure of the pipe. Specifically, bumps will cause defects such as dents on the surface of the pipe. These defects will become stress concentration points, leading to local stress concentration, thereby reducing the compressive capacity of the pipe. This effect is more significant, especially in high-stress environments. Therefore, in order to accurately detect the compressive performance of the pipe, it is necessary to identify the defects and avoid them for detection. To this end, we propose a device for detecting the compressive performance of metal pipes. Summary of the invention

[0004] The purpose of the present invention is to provide a device for testing the compressive performance of metal pipes, which can automatically identify depressions on the surface of the pipe and perform compressive testing on the pipe after avoiding the depressions, thereby improving the accuracy of the compressive performance testing of the pipe.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal pipe compression performance testing device, comprising an operating table, a fixed seat is fixedly installed on the operating table, two fixed rings are slidably installed on the fixed seat, each of the fixed rings is provided with a plurality of limiters for fixing the pipe, a hydraulic mechanism is provided on the top of the operating table, and a pressure plate is fixedly installed on the output end of the hydraulic mechanism;

[0006] A detection ring is fixedly installed on one side of the fixed ring on the right side, and a plurality of ball bearings are installed on the inner wall of the detection ring through a second spring, and a first magnetic strip is arranged on each of the ball bearings, and a plurality of guide grooves for limiting the first magnetic strip are arranged in the detection ring, and each of the first magnetic strips is located inside the guide groove and corresponds to each other one by one, and two second magnetic strips magnetically attracted to the first magnetic strip are slidably installed in each of the guide grooves, and a fixed rod is fixedly connected between the two corresponding second magnetic strips, and a telescopic plate limited by the fixed rod is fixedly installed on one side of each of the first magnetic strips , each of the telescopic plates is arranged in a wedge shape on both sides, a telescopic groove is arranged between two adjacent guide grooves, an elastic rod is slidably installed in each telescopic groove, and both ends of each elastic rod are fixedly connected to the corresponding second magnetic strip, an annular plate is slidably installed in the detection ring, a magnetic plate is fixedly installed on the annular plate, a straight groove for limiting the magnetic plate is arranged in the detection ring, an elastic column is fixedly connected between the magnetic plate and the inner wall of the straight groove, a compression rod is fixedly installed on the inner wall of the detection ring, and a marking block attracted by the magnetic force of the magnetic plate is fixedly installed on the end of the compression rod.

[0007] Preferably, a fixing plate is fixedly installed in the fixing ring on the left side, a telescopic column is fixedly installed on the fixing plate, a sleeve is sleeved in the middle of the telescopic column, a plurality of slide grooves are arranged on the sleeve, a slider is slidably installed in each of the slide grooves, a pressure sensing plate is fixedly installed on one side of the sleeve, an elastic band is fixedly connected between each of the sliders and the pressure sensing plate, a magnetic axis is rotatably installed on the end of the telescopic column, a plurality of rollers are arranged around the telescopic column, the rollers are arranged in a circle and correspond to the sliders one by one, connecting rods are rotatably installed on both sides of each of the rollers, and one end of each of the connecting rods is rotatably installed on the magnetic axis and the corresponding slider.

[0008] Preferably, a limit strip is fixedly installed at one end of the telescopic column, the limit strip is spirally arranged, a threaded groove matching the limit strip is arranged on the inner wall of the sleeve, a telescopic rod is fixedly installed on the sleeve, and an arc groove for limiting the telescopic rod is arranged on the fixing plate.

[0009] Preferably, a slide rail is fixedly installed on the top of the operating table, and the hydraulic mechanism is slidably installed on the slide rail. A mark detection device for identifying the mark of the marking block on the pipe is fixedly installed on the operating table. The mark detection device can control the hydraulic mechanism to move to an unmarked position on the pipe. A magnetic block that is magnetically attracted to the magnetic axis is fixedly installed on the pressure plate.

[0010] Preferably, each of the limiting members is slidably mounted on the inner wall of the fixing ring, and a second wedge block is fixedly mounted thereon, each of the fixing rings is provided with a plurality of limiting grooves for limiting the second wedge block, each of the second wedge blocks is located in the limiting groove and corresponds one to one, a first spring is fixedly connected between each of the second wedge blocks and the inner wall of the limiting groove, a first wedge block matching the second wedge block is slidably mounted in each of the limiting grooves, a sliding ring is slidably mounted in each of the fixing rings, and each of the first wedge blocks is fixedly mounted on the corresponding sliding ring.

[0011] Preferably, a swivel is rotatably mounted on one side of each sliding ring, and each swivel is rotatably mounted on a fixed ring, and they are connected via threads.

[0012] Preferably, a rotating shaft is rotatably installed in the fixed seat, two threaded strips are symmetrically fixedly installed on the rotating shaft, two limiting rings matching with the threaded strips are sleeved on the rotating shaft, the two limiting rings respectively match with the two threaded strips, and the two fixing rings are respectively fixedly connected with the two limiting rings.

[0013] Preferably, the elastic force of the second spring is greater than the magnetic attraction between the first magnetic strip and the second magnetic strip, and the elastic force of the telescopic plate is greater than the elastic force of the elastic column.

[0014] Preferably, the magnetic attraction force of the magnetic plate on the marking block is greater than the elastic force of the compression rod.

[0015] Preferably, each of the limiting members is made of elastic material and arranged in a circle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention uses balls to detect the flatness of the pipe surface. Through the connection between the elastic rod and the fixed rod, all the second magnetic strips will always keep moving synchronously in the guide groove. The unevenness of the pipe surface will cause a single or a few balls to move. Most of the balls drive the first magnetic strip to remain stationary in the guide groove, so that a single or a few balls drive the corresponding first magnetic strip to separate from the second magnetic strip. The telescopic plate will extend and push the annular plate and the magnetic plate, so that the magnetic plate is no longer aligned with the marking block. The marking block is moved toward the pipe by the elastic force of the compression rod and marks the surface of the pipe.

[0018] The present invention utilizes the magnetic attraction of the magnetic block to the magnetic axis so that the roller is always located under the pressure plate, which is convenient for detecting the deformation of the pipe. When the pipe is deformed under pressure, one or more rollers will be displaced by the pressure, and the magnetic axis will be attracted by the magnetic force of the magnetic block so that the telescopic column will not move. The self-locking property of the thread prevents the telescopic rod from driving the sleeve to move. The roller will move toward the telescopic column and drive the connecting rod to rotate. The end of the connecting rod will drive the slider to slide in the slide groove, so that the elastic band is stretched, and the pressure sensing plate will sense the pressure, indicating that the pipe is deformed under pressure at this time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the threaded strip of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the limiting groove and the first wedge block of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the limiting groove and the second wedge block of the present invention;

[0023] Figure 5 It is a schematic diagram of the limit strip and sleeve structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the roller structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the guide groove structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the annular plate of the present invention;

[0027] Fig. 9 It is a schematic diagram of the telescopic plate structure of the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the magnetic plate and the marking block of the present invention.

[0029] In the figure: 1, operating table; 2, fixed seat; 3, rotating shaft; 4, threaded strip; 5, limiting ring; 6, fixed ring; 7, rotating ring; 8, sliding ring; 9, first wedge block; 10, limiting groove; 11, second wedge block; 12, first spring; 13, limiting member; 14, fixed plate; 15, arc groove; 16, telescopic column; 17, limiting strip; 18, telescopic rod; 19, sleeve; 20, threaded groove; 21, slide groove; 22, pressure sensing plate; 23, magnetic axis; 24, slider; 25 , elastic belt; 26, roller; 27, connecting rod; 28, slide rail; 29, hydraulic mechanism; 30, pressure plate; 31, magnetic block; 32, mark detection device; 33, detection ring; 34, ball; 35, second spring; 36, guide groove; 37, first magnetic strip; 38, second magnetic strip; 39, fixed rod; 40, telescopic plate; 41, elastic rod; 42, telescopic groove; 43, annular plate; 44, straight groove; 45, magnetic plate; 46, elastic column; 47, compression rod; 48, mark block. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 10The present invention provides a technical solution: a metal pipe compression performance testing device, comprising an operating table 1, a fixed seat 2 is fixedly installed on the operating table 1, two fixed rings 6 are slidably installed on the fixed seat 2, a rotating shaft 3 is rotatably installed in the fixed seat 2, two threaded strips 4 are symmetrically fixedly installed on the rotating shaft 3, two limiting rings 5 ​​matching with the threaded strips 4 are sleeved on the rotating shaft 3, the two limiting rings 5 ​​are respectively matched with the two threaded strips 4, and the two fixing rings 6 are respectively fixedly connected with the two limiting rings 5. When the rotating shaft 3 is rotated, the limiting rings 5 ​​cooperate with the threaded strips 4 to make the two The limiting ring 5 drives the two fixing rings 6 to perform synchronous relative movement or opposite movement. Each fixing ring 6 is provided with a plurality of limiting members 13 for fixing the pipe. Each limiting member 13 is made of elastic material and is arranged in a circle, so that the limiting member 13 can have good contact with the surface of pipes of different diameters, thereby improving the stability of the limiting member 13 in fixing the pipe. Each limiting member 13 is slidably mounted on the inner wall of the fixing ring 6, and a second wedge block 11 is fixedly mounted thereon. Each fixing ring 6 is provided with a plurality of limiting members for limiting the second wedge block 11. The first spring 12 is fixedly connected between each second wedge block 11 and the inner wall of the limiting groove 10, and each limiting groove 10 is slidably installed with a first wedge block 9 that matches the second wedge block 11, and each fixed ring 6 is slidably installed with a sliding ring 8, and each first wedge block 9 is fixedly installed on the corresponding sliding ring 8, and each sliding ring 8 is rotatably installed with a swivel 7 on one side, and each swivel 7 is rotatably installed on the fixed ring 6, and they are connected by threads, and the swivel 7 is rotatably installed on the fixed ring 6. When the ring 7 is rotated, since the rotating ring 7 is connected to the fixed ring 6 by a thread, the end of the rotating ring 7 will push the sliding ring 8 to move in the fixed ring 6, and the sliding ring 8 will drive the corresponding first wedge block 9 to move synchronously into the limiting groove 10. Through the cooperation of the inclined surface of the first wedge block 9 and the inclined surface of the second wedge block 11, the corresponding second wedge block 11 will push the limiting member 13 to move toward the center line of the fixed ring 6, so that the first spring 12 is compressed, and through the self-locking property of the thread, the limiting member 13 can always be in contact with the surface of the pipe, so as to fix the pipe, and it is applicable to pipes of different diameters.

[0032] A detection ring 33 is fixedly installed on one side of the right fixing ring 6, and a plurality of ball bearings 34 are installed on the inner wall of the detection ring 33 through a second spring 35. A first magnetic strip 37 is arranged on each ball bearing 34, and a plurality of guide grooves 36 for limiting the first magnetic strip 37 are arranged in the detection ring 33. Each first magnetic strip 37 is located inside the guide groove 36 and corresponds to each other one by one. Two second magnetic strips 38 magnetically attracted to the first magnetic strip 37 are slidably installed in each guide groove 36. The elastic force of the second spring 35 is greater than the magnetic attraction between the first magnetic strip 37 and the second magnetic strip 38. A fixing rod 39 is fixedly connected between the two corresponding second magnetic strips 38. A telescopic plate 40 limited by the fixing rod 39 is fixedly installed on one side of each first magnetic strip 37. Both sides of the telescopic plate 40 are arranged in a wedge shape, and a telescopic groove 42 is arranged between two adjacent guide grooves 36. An elastic rod 41 is slidably installed in each telescopic groove 42, and both ends of each elastic rod 41 are fixedly connected to the corresponding second magnetic strip 38. An annular plate 43 is slidably installed in the detection ring 33, and a magnetic plate 45 is fixedly installed on the annular plate 43. A straight groove 44 for limiting the magnetic plate 45 is arranged in the detection ring 33, and an elastic column 46 is fixedly connected between the magnetic plate 45 and the inner wall of the straight groove 44. The elastic force of the telescopic plate 40 is greater than the elastic force of the elastic column 46. A compression rod 47 is fixedly installed on the inner wall of the detection ring 33, and a marking block 48 attracted by the magnetic force of the magnetic plate 45 is fixedly installed on the end of the compression rod 47. The magnetic attraction of the magnetic plate 45 to the marking block 48 is greater than that of the magnetic plate 45. Due to the elastic force of the compression rod 47, after the pipe enters the detection ring 33, multiple balls 34 will contact the surface of the pipe at the same time. According to the diameter of different pipes, the second spring 35 will be compressed to different degrees. At the same time, multiple balls 34 will synchronously drive the first magnetic strip 37 to move along the guide groove 36. Through the magnetic attraction between the first magnetic strip 37 and the second magnetic strip 38, all the second magnetic strips 38 and the fixed rod 39 will be driven to move synchronously along the guide groove 36, and the elastic rod 41 will move along the telescopic groove 42. Since the two ends of the elastic rod 41 are respectively fixedly connected to the corresponding second magnetic strip 38, the elastic rod 41 will be stretched accordingly. At this time, the elastic force of the elastic column 46 will push the end of the magnetic plate 45 to align with the marking block 48. Due to the magnetic attraction of the magnetic plate 45 to the marking block 48 When the elastic force of the second spring 35 is greater than the elastic force of the compression rod 47, the marking block 48 will retract and not contact the surface of the pipe. As the pipe moves, the ball 34 will always fit the surface of the pipe and detect the flatness of the surface of the pipe. When the surface of the pipe is uneven, the corresponding ball 34 will slide accordingly. Since the elastic force of the second spring 35 is greater than the magnetic attraction between the first magnetic strip 37 and the second magnetic strip 38, and through the connection between the elastic rod 41 and the fixed rod 39, all the second magnetic strips 38 will always remain in the guide groove 36 and move synchronously. The unevenness of the pipe surface will cause a single or a few ball 34 to move, and most of the ball 34 will drive the first magnetic strip 37 to remain stationary in the guide groove 36, so that a single or a few ball 34 drives the corresponding first magnetic strip 37 to separate from the second magnetic strip 38.The corresponding fixing rod 39 will no longer limit the telescopic plate 40. Since the elastic force of the telescopic plate 40 is greater than the elastic force of the elastic column 46, the telescopic plate 40 will extend and push the annular plate 43 and the magnetic plate 45, so that the magnetic plate 45 is no longer aligned with the marking block 48. The marking block 48 moves toward the pipe under the elastic force of the compression rod 47 and marks the surface of the pipe. When the uneven surface of the pipe leaves the ball 34, the second spring 35 drives the ball 34 and the first magnetic strip 37 to reset, and all the first magnetic strips 37 will be relocated to the same position of the guide groove 36 and aligned with the corresponding The second magnetic strip 38 restores the magnetic attraction state, and because both sides of the telescopic plate 40 are wedge-shaped, no matter the telescopic plate 40 moves to the upper side or the lower side of the fixed rod 39, the fixed rod 39 cooperates with the corresponding inclined surface of the telescopic plate 40 to make the telescopic plate 40 retract and reset, and return to the state of being limited by the fixed rod 39. The magnetic plate 45 and the annular plate 43 are also reset by the elastic force of the elastic column 46, and the end of the magnetic plate 45 is re-aligned with the marking block 48, so that the marking block 48 retracts and resets. Through the above operation, the uneven parts of the pipe surface can be marked.

[0033] A fixed plate 14 is fixedly installed in the left fixed ring 6, and a telescopic column 16 is fixedly installed on the fixed plate 14. A limit strip 17 is fixedly installed at one end of the telescopic column 16, and the limit strip 17 is spirally arranged. A sleeve 19 is sleeved in the middle of the telescopic column 16, and a threaded groove 20 matching the limit strip 17 is arranged on the inner wall of the sleeve 19. A telescopic rod 18 is fixedly installed on the sleeve 19, and an arc groove 15 for limiting the telescopic rod 18 is arranged on the fixed plate 14. A plurality of slide grooves 21 are arranged on the sleeve 19, and a slider 24 is slidably installed in each slide groove 21. A pressure sensing plate 22 is fixedly installed on one side of the sleeve 19, and an elastic belt 25 is fixedly connected between each slider 24 and the pressure sensing plate 22. A magnetic axis 23 is rotatably installed at the end of the telescopic column 16, and a plurality of slide grooves 21 are arranged on the sleeve 19. A plurality of rollers 26 are arranged in a circle and correspond to the sliders 24 one by one. Connecting rods 27 are rotatably installed on both sides of each roller 26. One end of each connecting rod 27 is rotatably installed on the magnetic shaft 23 and the corresponding slider 24. The telescopic rod 18 is rotated along the arc groove 15 to drive the sleeve 19 to rotate. Through the cooperation of the limit strip 17 and the threaded groove 20, the sleeve 19 is rotated and slid at the end of the telescopic column 16. The connection between the connecting rod 27 and the roller 26 will drive the magnetic shaft 23 and the sleeve 19 to rotate synchronously. The distance between the sleeve 19 and the magnetic shaft 23 will be adjusted so that the two ends of the connecting rod 27 rotate accordingly, and the distance between the roller 26 and the inner wall of the pipe is adjusted so that all the rollers 26 can be synchronously in close contact with the inner wall of the pipe, and can be suitable for pipes of different diameters.

[0034] A slide rail 28 is fixedly installed on the top of the operating table 1, and a hydraulic mechanism 29 is arranged on the top of the operating table 1. The hydraulic mechanism 29 is slidably installed on the slide rail 28. A mark detection device 32 for identifying the mark of the mark block 48 on the pipe is fixedly installed on the operating table 1 (the mark detection device 32 is an existing known electronic identification mechanism, so the present invention will not be described in detail). The mark detection device 32 can control the hydraulic mechanism 29 to move to a position where the pipe is unmarked. A pressure plate 30 is fixedly installed on the output end of the hydraulic mechanism 29. A magnetic block 31 that is magnetically attracted to the magnetic axis 23 is fixedly installed on the pressure plate 30. Through the recognition of the mark by the mark detection device 32, the hydraulic mechanism 29 is controlled to drive the pressure plate 30 to move to a position where the pipe is unmarked. The position of the telescopic column 16 and the telescopic rod 18 will be driven to extend accordingly through the magnetic attraction of the magnetic block 31 to the magnetic axis 23, so that the roller 26 is always located below the pressure plate 30. When the pipe is deformed under pressure, one or more rollers 26 will be displaced by the pressure, and the magnetic axis 23 will be attracted by the magnetic force of the magnetic block 31, so that the telescopic column 16 will not move. The self-locking property of the thread will prevent the telescopic rod 18 from driving the sleeve 19 to move. The roller 26 will move toward the telescopic column 16 and drive the connecting rod 27 to rotate. The end of the connecting rod 27 will drive the slider 24 to slide in the slide groove 21, so that the elastic band 25 is stretched, and the pressure sensing plate 22 will sense the pressure, indicating that the pipe is deformed under pressure at this time.

[0035] Specifically, firstly, the rotating shaft 3 is rotated, and the two limiting rings 5 ​​drive the two fixing rings 6 to perform synchronous relative movement through the cooperation of the limiting ring 5 and the threaded strip 4, so that the two fixing rings 6 maintain a relatively close spacing, and then the pipe is inserted from the detection ring 33 and passes through the two fixing rings 6 in sequence. After the pipe enters the detection ring 33, multiple balls 34 will contact the surface of the pipe at the same time. According to the diameter of different pipes, the second spring 35 will be compressed to different degrees. At the same time, multiple balls 34 will synchronously drive the first magnetic strip 37 to move along the guide groove 36. Through the magnetic attraction between the first magnetic strip 37 and the second magnetic strip 38, all the second magnetic strips 38 and the fixing rod 39 will be driven to move synchronously along the guide groove 36, and the elastic rod 41 will move along the telescopic groove 42. The two ends of the elastic rod 41 are respectively fixedly connected to the corresponding second magnetic strip 38, and the elastic rod 41 will be stretched accordingly. At this time, the elastic force of the elastic column 46 will push the end of the magnetic plate 45 to align with the marking block 48. Since the magnetic attraction of the magnetic plate 45 to the marking block 48 is greater than the elastic force of the compression rod 47, the marking block 48 will retract and not contact the surface of the pipe, and then the left swivel 7 is rotated, and the end of the swivel 7 will push the sliding ring 8 to move in the fixed ring 6, and the sliding ring 8 will drive the corresponding first wedge block 9 to move synchronously into the limiting groove 10. Through the cooperation of the inclined surface of the first wedge block 9 and the inclined surface of the second wedge block 11, the corresponding second wedge block 11 will push the limiting member 13 to move toward the center line of the fixed ring 6, so that the first spring 12 is compressed, and the limiting member 1 is locked through the self-locking property of the thread. 3 can always be in contact with the surface of the pipe, fix the left end of the pipe, and then rotate the rotating shaft 3 again to make the two fixing rings 6 move synchronously and oppositely, and the pipe will move in the detection ring 33 and the right fixing ring 6. As the pipe moves, the ball 34 will always fit with the surface of the pipe and detect the flatness of the surface of the pipe. When the surface of the pipe is uneven, the corresponding ball 34 will slide accordingly. Since the elastic force of the second spring 35 is greater than the magnetic attraction between the first magnetic strip 37 and the second magnetic strip 38, and through the connection between the elastic rod 41 and the fixing rod 39, all the second magnetic strips 38 will always keep moving synchronously in the guide groove 36. The unevenness of the pipe surface will cause a single or a few ball 34 to move, and most of the ball 34 will drive the first magnetic strip 37 to move in the guide groove. The guide groove 36 remains stationary, so that a single or a few balls 34 drive the corresponding first magnetic strip 37 to separate from the second magnetic strip 38, and the corresponding fixed rod 39 will no longer limit the telescopic plate 40. Since the elastic force of the telescopic plate 40 is greater than the elastic force of the elastic column 46, the telescopic plate 40 will extend and push the annular plate 43 and the magnetic plate 45, so that the magnetic plate 45 is no longer aligned with the marking block 48. The marking block 48 moves toward the pipe under the elastic force of the compression rod 47 and marks the surface of the pipe. When the uneven surface of the pipe leaves the ball 34, the second spring 35 drives the ball 34 and the first magnetic strip 37 to reset, and all the first magnetic strips 37 will be re-located to the same position of the guide groove 36, and restore the magnetic attraction state with the corresponding second magnetic strip 38. Moreover, since both sides of the telescopic plate 40 are wedge-shaped,No matter the telescopic plate 40 moves to the upper or lower side of the fixed rod 39, the telescopic plate 40 can be retracted and reset through the cooperation of the fixed rod 39 and the corresponding inclined surface of the telescopic plate 40, and it is in the state of being limited by the fixed rod 39 again. The magnetic plate 45 and the annular plate 43 are also reset by the elastic force of the elastic column 46, and the end of the magnetic plate 45 is aligned with the marking block 48 again, so that the marking block 48 retracts and no longer marks, effectively marking the uneven parts of the pipe surface. After the right end of the pipe moves into the right fixing ring 6, The right swivel 7 is rotated again to fix the right end of the pipe. At this time, the mark detection device 32 recognizes the mark and controls the hydraulic mechanism 29 to drive the pressure plate 30 to move to the unmarked position of the pipe. The magnetic block 31 attracts the magnetic shaft 23 with magnetic force, which drives the telescopic column 16 and the telescopic rod 18 to extend accordingly, so that the roller 26 is always located below the pressure plate 30. Then, the telescopic rod 18 is rotated along the arc groove 15 to drive the sleeve 19 to rotate. Through the cooperation of the limit strip 17 and the threaded groove 20, the sleeve 19 can be rotated. The sleeve 19 rotates and slides at the end of the telescopic column 16, and the connection between the connecting rod 27 and the roller 26 will drive the magnetic shaft 23 and the sleeve 19 to rotate synchronously. The distance between the sleeve 19 and the magnetic shaft 23 will be adjusted, so that the two ends of the connecting rod 27 rotate accordingly, and the distance between the roller 26 and the inner wall of the pipe is adjusted so that all the rollers 26 can be in close contact with the inner wall of the pipe synchronously, and can be suitable for pipes of different diameters. Then the hydraulic mechanism 29 is started to press the pressure plate 30 against the pipe. When the pipe is compressed and changes When the tube is deformed, one or more rollers 26 will be displaced by pressure, the magnetic shaft 23 will be attracted by the magnetic force of the magnetic block 31, so that the telescopic column 16 will not move, the self-locking property of the thread will prevent the telescopic rod 18 from driving the sleeve 19 to move, the roller 26 will move toward the telescopic column 16 and drive the connecting rod 27 to rotate, the end of the connecting rod 27 will drive the slider 24 to slide in the slide groove 21, so that the elastic band 25 is stretched, and the pressure sensing plate 22 will sense the pressure, indicating that the tube is deformed by pressure at this time.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the compressive properties of metal pipes, comprising an operating table (1), characterized in that: A fixing seat (2) is fixedly mounted on the operating table (1), two fixing rings (6) are slidably mounted on the fixing seat (2), and each fixing ring (6) is provided with a plurality of stoppers (13) for fixing pipes. A hydraulic mechanism (29) is arranged on the top of the operating table (1), and a pressure plate (30) is fixedly mounted on the output end of the hydraulic mechanism (29); A detection ring (33) is fixedly installed on one side of the fixing ring (6) on the right side. A plurality of balls (34) are installed on the inner wall of the detection ring (33) via a second spring (35). A first magnetic strip (37) is arranged on each of the balls (34). A plurality of guide grooves (36) for limiting the first magnetic strip (37) are arranged in the detection ring (33). Each of the first magnetic strips (37) is located inside the guide groove (36) and corresponds to each other. Two second magnetic strips (38) magnetically attracted to the first magnetic strip (37) are slidably installed in each of the guide grooves (36). A fixing rod (39) is fixedly connected between the two corresponding second magnetic strips (38). A telescopic plate (40) limited by the fixing rod (39) is fixedly installed on one side of each of the first magnetic strips (37). Both sides of the telescopic plate (40) are arranged in a wedge shape, and a telescopic groove (42) is arranged between two adjacent guide grooves (36). An elastic rod (41) is slidably installed in each telescopic groove (42), and both ends of each elastic rod (41) are fixedly connected to the corresponding second magnetic strip (38). An annular plate (43) is slidably installed in the detection ring (33), and a magnetic plate (45) is fixedly installed on the annular plate (43). A straight groove (44) for limiting the magnetic plate (45) is arranged in the detection ring (33), and an elastic column (46) is fixedly connected between the magnetic plate (45) and the inner wall of the straight groove (44). A compression rod (47) is fixedly installed on the inner wall of the detection ring (33), and a marking block (48) attracted by the magnetic force of the magnetic plate (45) is fixedly installed at the end of the compression rod (47).

2. A metal pipe compression performance testing device according to claim 1, characterized in that: A fixed plate (14) is fixedly installed in the fixed ring (6) on the left side, and a telescopic column (16) is fixedly installed on the fixed plate (14). A sleeve (19) is sleeved in the middle of the telescopic column (16), and a plurality of slide grooves (21) are arranged on the sleeve (19). A slider (24) is slidably installed in each of the slide grooves (21). A pressure sensing plate (22) is fixedly installed on one side of the sleeve (19), and an elastic band (25) is fixedly connected between each of the sliders (24) and the pressure sensing plate (22). A magnetic shaft (23) is rotatably installed at the end of the telescopic column (16). A plurality of rollers (26) are arranged around the telescopic column (16), and the rollers (26) are arranged in a circle and correspond to the sliders (24) one by one. A connecting rod (27) is rotatably installed on both sides of each of the rollers (26), and one end of each of the connecting rods (27) is rotatably installed on the magnetic shaft (23) and the corresponding slider (24).

3. A metal pipe compression performance testing device according to claim 2, characterized in that: A limit strip (17) is fixedly mounted on one end of the telescopic column (16), the limit strip (17) being arranged in a spiral shape, a thread groove (20) matching the limit strip (17) is arranged on the inner wall of the sleeve (19), a telescopic rod (18) is fixedly mounted on the sleeve (19), and an arc groove (15) for limiting the telescopic rod (18) is arranged on the fixing plate (14).

4. A metal pipe compression performance testing device according to claim 2, characterized in that: A slide rail (28) is fixedly mounted on the top of the operating table (1), the hydraulic mechanism (29) is slidably mounted on the slide rail (28), a mark detection device (32) for identifying a mark on a pipe by a mark block (48) is fixedly mounted on the operating table (1), and a magnetic block (31) magnetically attracted to the magnetic axis (23) is fixedly mounted on the pressure plate (30).

5. The metal pipe compression performance testing device according to claim 1, characterized in that: Each of the limiting members (13) is slidably mounted on the inner wall of the fixing ring (6), and a second wedge block (11) is fixedly mounted thereon; each of the fixing rings (6) is provided with a plurality of limiting grooves (10) for limiting the second wedge block (11); each of the second wedge blocks (11) is located in the limiting groove (10) and corresponds to each other; a first spring (12) is fixedly connected between each of the second wedge blocks (11) and the inner wall of the limiting groove (10); a first wedge block (9) matching the second wedge block (11) is slidably mounted in each of the limiting grooves (10); a sliding ring (8) is slidably mounted in each of the fixing rings (6), and each of the first wedge blocks (9) is fixedly mounted on the corresponding sliding ring (8).

6. A metal pipe compression performance testing device according to claim 5, characterized in that: A rotating ring (7) is rotatably mounted on one side of each sliding ring (8), and each rotating ring (7) is rotatably mounted on a fixed ring (6), and the two are connected via threads.

7. The device for detecting the compressive performance of a metal pipe according to claim 1, characterized in that: A rotating shaft (3) is rotatably mounted in the fixing seat (2), two threaded strips (4) are symmetrically fixedly mounted on the rotating shaft (3), two limiting rings (5) matching with the threaded strips (4) are sleeved on the rotating shaft (3), the two limiting rings (5) respectively matching with the two threaded strips (4), and the two fixing rings (6) are respectively fixedly connected with the two limiting rings (5).

8. The device for detecting the compressive performance of a metal pipe according to claim 1, characterized in that: The elastic force of the second spring (35) is greater than the magnetic attraction force between the first magnetic strip (37) and the second magnetic strip (38), and the elastic force of the telescopic plate (40) is greater than the elastic force of the elastic column (46).

9. The device for detecting the compressive performance of a metal pipe according to claim 1, characterized in that: The magnetic attraction force of the magnetic plate (45) on the marking block (48) is greater than the elastic force of the compression rod (47).

10. The device for detecting the compressive performance of a metal pipe according to claim 5, characterized in that: Each of the limiting components (13) is made of elastic material and is arranged in a circle.

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