PEXA tube tensile strength detector

Abstract

The application discloses a PEXA pipe tensile strength detector and relates to the technical field of PEXA pipe tensile strength detection.The PEXA pipe tensile strength detector comprises a base plate, a rotating plate rotatably arranged on the base plate, a stretching assembly, a plurality of lower clamp assemblies, a gear ring driving assembly and a stand, the stretching assembly comprises a back plate fixed to the base plate, one side of the back plate is fixed with a pair of hydraulic rods, the end portions of the two hydraulic rods are fixedly connected with a top frame, the bottom of the top frame is fixed with a transmission column, and the bottom end of the transmission column is fixed with a lifting block; through the plurality of lower clamp assemblies and the corresponding upper clamp assemblies arranged on the rotating plate, the gear ring driving assembly and the rotating action of the rotating plate, the cyclic operation of 'detection-switching-re-detection' can be realized; when the stretching test is carried out at the current work station, the sample bars can be simultaneously loaded and unloaded at other work stations, the idle time of the equipment is greatly reduced, and the detection efficiency can be effectively improved; through the cooperation of the L-shaped end rod and the C-shaped frame plate, the switching operation can be directly completed when the rotating plate rotates.

Description

Technical Field

[0001] This invention relates to the field of PEXA tube tensile strength testing technology, and in particular to a PEXA tube tensile strength testing instrument. Background Technology

[0002] In the field of materials mechanical property testing, tensile strength testing is one of the core methods for evaluating the quality of PEXA (cross-linked polyethylene) pipes. Existing tensile strength testing equipment generally uses mechanical or hydraulically driven clamp structures to fix the sample. However, these clamp designs have significant flaws, severely limiting testing efficiency and data reliability.

[0003] Traditional fixtures often rely on manual tightening, pin locking, or bolt pressing to secure the specimens. Each test requires manual completion of the entire process of specimen clamping, centering, tightening, and unloading, which is cumbersome and time-consuming. Especially in batch testing scenarios, personnel need to repeatedly interrupt the test process to load and unload materials, resulting in less than 50% effective equipment operating time and severely limiting testing efficiency.

[0004] In addition, manual operation makes it difficult to precisely control the clamping force and position: the clamping force applied by different operators (or the same person operating multiple times) varies significantly, which can easily lead to initial stress concentration or local deformation of the specimen in the fixture. Inconsistent clamping conditions increase the standard deviation of tensile strength data of the same batch of specimens, affecting the accuracy of quality judgment. When the friction between the clamping surface and the specimen is insufficient, the specimen may slip or even fall off during the tensile process, forcing the test to be stopped. At the same time, relying entirely on manual operation makes it impossible to reproduce completely consistent clamping conditions, hindering data comparison and standard certification between laboratories.

[0005] As the application of PEXA pipes expands in high-pressure scenarios such as water supply and heating, the industry's requirements for testing efficiency and data accuracy continue to increase, and existing fixture technology can no longer meet these requirements. Specifically, the fixture design of current tensile testing instruments relies too heavily on manual intervention, which has become a bottleneck restricting the improvement of testing efficiency and data accuracy. Summary of the Invention

[0006] The purpose of this invention is to provide a PEXA tube tensile strength tester to solve the problems mentioned in the background art.

[0007] The technical solution of the present invention is: a PEXA tube tensile strength tester, comprising a base plate, wherein a rotating plate is rotatably mounted on the base plate, and further comprising: A stretching assembly includes a back plate fixed to a substrate, a pair of hydraulic rods fixed to one side of the back plate, a top frame fixed to the ends of the two hydraulic rods, a transmission column fixed to the bottom of the top frame, a lifting block fixed to the bottom end of the transmission column, a pair of sensor assemblies fixed to the bottom side of the lifting block, and a C-shaped frame plate fixed to the bottom side of the pair of sensor assemblies. Multiple lower clamping assemblies are arranged on a rotating plate, and upper clamping assemblies are arranged above each of the lower clamping assemblies; A gear ring drive assembly, which is used to drive the lower clamp assembly and the upper clamp assembly to clamp and release; The column is fixed at the center of the rotating plate, and multiple guide grooves are fixed on the outer perimeter of the column. A cantilever rod is slidably installed in each guide groove. A movable rod is rotatably installed between the cantilever rod and the guide groove, and two adjacent movable rods are rotatably connected.

[0008] Preferably, a limiting ring plate is fixed on the surface of the substrate, and the limiting ring plate is rotatably connected to the rotating plate, and the limiting ring plate and the rotating plate are coaxially arranged.

[0009] Preferably, each of the lower clamping components includes a fixed clamping plate two and a base block two fixedly mounted on the rotating plate, and a movable clamping plate two is provided between the fixed clamping plate two and the base block two. A pair of guide rods two are fixed on the movable clamping plate two, and the guide rods two are slidably connected to the base block two. A reset spring two is provided on the outer side of each guide rod two, and the two ends of the reset spring two are fixedly connected to the base block two and the movable clamping plate two, respectively.

[0010] Preferably, each of the upper clamping components includes a mounting plate, and a base block and a fixed clamping plate are fixed to the bottom side of the mounting plate. A movable clamping plate is provided between the base block and the fixed clamping plate. A pair of guide rods are fixed on the movable clamping plate. The guide rods are slidably connected to the base block. A return spring is sleeved on the outer side of each guide rod. The two ends of the return spring are fixedly connected to the base block and the movable clamping plate, respectively.

[0011] Preferably, both base block one and base block two have threaded posts threaded to their middle ends, and one end of each threaded post is fixed with a toothed end.

[0012] Preferably, the top of the mounting plate has an opening, and a pair of L-shaped end rods are fixed to the top of the mounting plate. The L-shaped end rods are used to form an overlapping fit with the C-shaped frame plate, and one side of the mounting plate is fixedly connected to the cantilever rod.

[0013] Preferably, a mounting frame is fixed to the top of the substrate, a pair of end tubes are fixed to one side of the mounting frame, and conductive ends are provided inside the end tubes. Guide rods are slidably mounted on the ends of the end tubes, and light-emitting plates are fixed to the ends of the two guide rods. Reset springs are sleeved on both sides of the guide rods, and the two ends of the reset springs are fixedly connected to the end tubes and the light-emitting plates, respectively.

[0014] Preferably, a U-shaped top frame is fixed to one side of the back plate, and the end of the U-shaped top frame is rotatably connected to the top of the column. A worm gear is fixed to one end of the column near the top, and a drive motor is fixed to the top of the U-shaped top frame. A worm gear meshing with the worm gear is fixed to the output shaft of the drive motor, and the helix angle between the worm gear and the worm wheel is smaller than the friction angle.

[0015] Preferably, a display panel is fixed to one side of the back plate, a control panel is fixed on the substrate, and the control panel is electrically connected to the drive motor and the hydraulic rod. The display panel is electrically connected to the sensor assembly through a processor.

[0016] Preferably, the gear ring drive assembly includes a side arc plate one and a side arc plate two fixed on the substrate. A pair of upper gear ring plates are fixed on one side of the side arc plate one, and a pair of lower gear ring plates are fixed on one side of the side arc plate two. Both the upper gear ring plates and the lower gear ring plates are adapted to the convex tooth end.

[0017] The present invention provides an improved PEXA tube tensile strength tester, which, compared with the prior art, has the following improvements and advantages: Firstly, this invention, through multiple lower clamping assemblies and corresponding upper clamping assemblies set on the rotating plate, in conjunction with the gear ring drive assembly and the rotating plate's rotational action, can realize a cyclical operation of "detection-switching-re-detection"; when the current station is performing tensile testing, other stations can simultaneously load and unload specimens, significantly reducing equipment downtime and effectively improving detection efficiency; by utilizing the L-shaped end rod in conjunction with the C-shaped frame plate, the switching operation can be directly completed while the rotating plate is rotating; Secondly, when the rotating plate of this invention rotates clockwise, the convex tooth end first engages with the upper toothed ring plate, driving the threaded column to rotate, causing the movable clamping plate one and movable clamping plate two to loosen the sample, facilitating unloading; when rotating further, the convex tooth end engages with the lower toothed ring plate, driving the threaded column to rotate in the opposite direction, pushing the movable clamping plate one and movable clamping plate two to clamp the new sample; ensuring uniform clamping force, avoiding human operation errors, and ensuring consistent clamping force for each test; Thirdly, when the movable rod deflects to its limit position (without breaking the sample), the present invention pushes the light-emitting plate to contact the conductive end, causing the light-emitting plate to emit light and alarm, visually indicating that the sample has passed the tensile test. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1This is a first-view perspective three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the overall second-view three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the upper clamping assembly and the lower clamping assembly of the present invention; Figure 4 This is a schematic diagram showing the angle change state of the movable rod in this invention; Figure 5 This is a three-dimensional structural diagram of the first and second side arc plates of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the end tube of the present invention; Figure 7 This is an exploded view of the lifting block and C-shaped frame plate of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the movable rod of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle.

[0020] Figure label: 1. Base plate; 2. Limiting ring plate; 3. Rotating plate; 4. Upper clamp assembly; 401. L-shaped end rod; 402. Mounting plate; 403. Fixed clamp plate one; 404. Movable clamp plate one; 405. Return spring one; 406. Guide rod one; 407. Base block one; 5. Lower clamp assembly; 501. Fixed clamp plate two; 502. Movable clamp plate two; 503. Guide rod two; 504. Return spring two; 505. Base block two; 6. Threaded column; 601. Toothed end; 7. Cantilever rod; 8. Control panel; 9. Through port; 10. Display panel; 11. Column; 12. Backplate; 13. U-shaped top frame; 14. Hydraulic rod; 15. Mounting frame; 151. End cylinder; 152. Guide rod three; 153. Return spring three; 154. Conductive end; 155. Light-emitting plate; 16. Side arc plate one; 161. Upper toothed ring plate; 17. Side arc plate two; 171. Lower toothed ring plate; 18. Movable rod; 19. Guide groove; 20. Top frame; 21. Transmission column; 22. Lifting block; 23. Sensor assembly; 24. C-shaped frame plate; 25. Drive motor; 251. Worm gear; 252. Worm wheel. Detailed Implementation

[0021] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides an improved PEXA tube tensile strength tester. The technical solution of this invention is as follows: like Figures 1 to 9 As shown, this embodiment of the invention provides a PEXA tube tensile strength tester, including a base plate 1, on which a rotating plate 3 is rotatably mounted, and further including: The stretching assembly includes a back plate 12 fixed on the base plate 1. A pair of hydraulic rods 14 are fixed on one side of the back plate 12. The ends of the two hydraulic rods 14 are jointly fixed to a top frame 20. A transmission column 21 is fixed to the bottom of the top frame 20. A lifting block 22 is fixed to the bottom end of the transmission column 21. A pair of sensor assemblies 23 are fixed to the bottom side of the lifting block 22. A C-shaped frame plate 24 is jointly fixed to the bottom side of the pair of sensor assemblies 23. The C-shaped frame plate 24 can be used to form a quick connection with the upper clamping assembly 4.

[0023] Multiple lower clamping assemblies 5 are mounted on the rotating plate 3, and upper clamping assemblies 4 are mounted above each lower clamping assembly 5. By using the multiple lower clamping assemblies 5 and upper clamping assemblies 4, the lower clamping assemblies 5 and upper clamping assemblies 4 can be quickly switched after the tensile testing is completed, and the next tensile test can be performed quickly. Thus, the loading and unloading of the sample can be carried out at the same time as the tensile test.

[0024] The gear ring drive assembly is used to drive the lower clamp assembly 5 and the upper clamp assembly 4 to clamp and release. By using the gear drive assembly, it can work with the lower clamp assembly 5 and the upper clamp assembly 4 to quickly clamp or release the sample, further improving the detection efficiency. At the same time, the clamping degree of the lower clamp assembly 5 and the upper clamp assembly 4 is consistent, which can effectively reduce the instability factors in the detection process.

[0025] The column 11 is fixed at the center of the rotating plate 3, and multiple guide grooves 19 are fixed on the outer peripheral wall of the column 11. A cantilever rod 7 is slidably installed in each guide groove 19. A movable rod 18 is rotatably installed between the cantilever rod 7 and the guide groove 19, and two adjacent movable rods 18 are rotatably connected. The guide grooves 19 can cooperate with the cantilever rods 7 to guide the upper clamping assembly 4. At the same time, it can also limit the minimum height of the upper clamping assembly 4 to ensure that the clamping position of the spline is consistent each time.

[0026] Furthermore, a limiting ring plate 2 is fixed on the surface of the substrate 1, and the limiting ring plate 2 is rotatably connected to the rotating plate 3. The limiting ring plate 2 and the rotating plate 3 are coaxially arranged. The limiting ring plate 2 can support and reinforce the rotating plate 3 to meet the support foundation of the lower clamping assembly 5.

[0027] As a further embodiment of the present invention, such as Figure 3As shown, each lower clamp assembly 5 includes a fixed clamping plate 501 and a base block 505 fixedly mounted on the rotating plate 3. A movable clamping plate 502 is provided between the fixed clamping plate 501 and the base block 505. A pair of guide rods 503 are fixed on the movable clamping plate 502. The guide rods 503 are slidably connected to the base block 505. A return spring 504 is provided on the outer side of each guide rod 503. The two ends of the return spring 504 are fixedly connected to the base block 505 and the movable clamping plate 502, respectively.

[0028] Furthermore, each upper clamping assembly 4 includes a mounting plate 402, and a base block 407 and a fixed clamping plate 403 are fixed on the bottom side of the mounting plate 402. A movable clamping plate 404 is provided between the base block 407 and the fixed clamping plate 403. A pair of guide rods 406 are fixed on the movable clamping plate 404. The guide rods 406 are slidably connected to the base block 407. A return spring 405 is sleeved on the outer side of each guide rod 406. The two ends of the return spring 405 are fixedly connected to the base block 407 and the movable clamping plate 404, respectively.

[0029] Furthermore, both base block 407 and base block 505 are threadedly connected to the middle end with threaded posts 6, and one end of each threaded post 6 is fixed with a toothed end 601; through the above structure, the rotation of the threaded posts 6 can push the movable clamping plate 404 and the movable clamping plate 502, thereby as shown in the attached... Figure 3 As shown, this allows for rapid clamping of splines.

[0030] Furthermore, the top of the mounting plate 402 is provided with an opening 9, and a pair of L-shaped end rods 401 are fixed to the top of the mounting plate 402. The L-shaped end rods 401 are used to form an overlapping fit with the C-shaped frame plate 24. One side of the mounting plate 402 is fixedly connected to the cantilever rod 7. The opening 9 facilitates the direct insertion of the template between the upper clamp assembly 4 and the lower clamp assembly 5 to improve the feeding rate. At the same time, when it is necessary to switch between the upper clamp assembly 4 and the lower clamp assembly 5, the rotating plate 3 can be rotated directly. At this time, the L-shaped end rods 401 cooperate with the C-shaped frame plate 24 to quickly complete the switching operation. It should be noted that the opening 9 is adapted to the end width of the template.

[0031] As a further embodiment of the present invention, such as Figure 1 , Figure 4 as well as Figure 6As shown, a mounting frame 15 is fixed to the top of the substrate 1. A pair of end cylinders 151 are fixed to one side of the mounting frame 15, and a conductive end 154 is provided inside the end cylinder 151. Guide rods 152 are slidably mounted on the ends of the end cylinders 151. A light-emitting plate 155 is fixed to the ends of the two guide rods 152. A reset spring 153 is sleeved on both sides of the guide rods 152. The two ends of the reset springs 153 are fixedly connected to the end cylinders 151 and the light-emitting plate 155, respectively. With the above structure, as the stretching operation proceeds, the upper clamp assembly 4 will gradually move upward. At this time, the two movable rods 18 will form a... Figure 4 In the state shown, the movable rod 18 deflected to one side will abut against the light-emitting plate 155, causing the light-emitting plate 155 and the guide rod 152 to move into the end cylinder 151. When the guide rod 152 contacts the conductive end 154, it can connect the circuit of the light-emitting plate 155 and make the light-emitting plate 155 emit light. If the sample has not broken at this time, the tensile strength test of the surface sample is qualified. Compared with the traditional tensile test, it can make the detection phenomenon more obvious and easier for personnel to observe and record.

[0032] As a further embodiment of the present invention, such as Figure 7 As shown, a U-shaped top frame 13 is fixed to one side of the back plate 12, and the end of the U-shaped top frame 13 is rotatably connected to the top of the column 11. A worm gear 252 is fixed to the end of the column 11 near the top, and a drive motor 25 is fixed to the top of the U-shaped top frame 13. The output shaft of the drive motor 25 is fixed with a worm 251 that meshes with the worm gear 252. In order to make the transmission between the worm 251 and the worm gear 252 more stable and ensure the accurate positioning of the rotating plate 3, the helix angle of the worm 251 and the worm gear 252 is less than the friction angle. Through the above structure, the drive motor 25 is controlled to start, and the column 11 and the rotating plate 3 can be rotated through the transmission action of the worm 251 and the worm gear 252, so as to realize the switching between the upper clamping assembly 4 and the lower clamping assembly 5.

[0033] Furthermore, a display panel 10 is fixed to one side of the back plate 12, and a control panel 8 is fixed on the substrate 1. The control panel 8 is electrically connected to the drive motor 25 and the hydraulic rod 14. The display panel 10 is electrically connected to the sensor assembly 23 through the processor. It should be noted that the sensor assembly 23 includes a tension sensor and a displacement sensor, and displays the displacement and tension magnitude during the detection process on the display panel 10.

[0034] Furthermore, the gear ring drive assembly includes a side arc plate 16 and a side arc plate 17 fixed on the base plate 1. A pair of upper gear ring plates 161 are fixed to one side of the side arc plate 16, and a pair of lower gear ring plates 171 are fixed to one side of the side arc plate 17. Both the upper gear ring plates 161 and the lower gear ring plates 171 are adapted to the protruding tooth end 601. With the above structure, when the rotating plate 3 rotates clockwise, the protruding tooth end 601 will first pass through the upper gear ring plate 161 and rotate, so that the upper clamping assembly 4 and the lower clamping assembly 5 are released, so as to automatically release the tested sample. After inserting a new sample, as the rotating plate 3 continues to rotate, the protruding tooth end 601 will mesh with the lower gear ring plate 171, driving the threaded column 6 to rotate in the opposite direction, thereby completing the automatic clamping of the sample during the connection operation, further improving the detection efficiency. At the same time, as Figure 7 As shown, the widths of the upper toothed ring plate 161 and the lower toothed ring plate 171 are redundant, which allows the convex tooth end 601 to maintain a continuous meshing relationship.

[0035] The specific working method is as follows: When using, insert the PEXA tube template vertically into the lower clamp assembly 5 and the upper clamp assembly 4, that is, between the fixed clamp plate 2 501 and the movable clamp plate 2 502, and between the fixed clamp plate 1 403 and the movable clamp plate 1 404. The template can pass through the through hole 9 of the mounting plate 402 to complete the quick installation of the template. The drive motor 25 is started using the control panel 8, which drives the worm wheel 252 through the worm 251, causing the column 11 and the rotating plate 3 to rotate clockwise; the toothed end 601 first contacts the upper toothed ring plate 161, causing the threaded column 6 to rotate, pushing the movable clamping plate 1 404 and the movable clamping plate 2 502 to release the old spline. When rotating to the new work position, the convex tooth end 601 engages with the lower toothed ring plate 171, the threaded column 6 rotates in the opposite direction, pushing the movable clamping plate 1 404 and the movable clamping plate 2 502 to clamp the new template; the hydraulic rod 14 is activated using the control panel 8 to push the top frame 20 and the transmission column 21 upward; the lifting block 22 connects with the L-shaped end rod 401 of the upper clamping assembly 4 through the C-shaped frame plate 24, driving the upper clamping assembly 4 to move upward as a whole, the template is subjected to tension, and the tension value is transmitted to the display panel 10 in real time through the sensor assembly 23; finally, when the upper clamping assembly 4 moves upward, the cantilever rod 7 slides along the guide groove 19, and the movable rod 18 deflects (as shown in the image). Figure 4 As shown), ensure the spline remains in a vertically stretched state; if the spline does not break and is stretched to the set height, the movable rod 18 deflects and pushes the light-emitting plate 155 to compress the reset spring 153, so that the guide rod 152 contacts the conductive end 154, and the light-emitting plate 155 lights up, indicating that the tensile strength is qualified; if the spline breaks, the sensor assembly 23 records the tensile force and displacement at the moment of breakage in real time, and the data is displayed synchronously on the display panel 10; After the current station test is completed, the drive motor 25 starts, the turntable 3 rotates to the next station, the gear ring drive assembly automatically releases the tested sample and clamps the new sample, and finally, the hydraulic rod 14 resets, ready for the next stretching.

[0036] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PEXA tube tensile strength tester, comprising a base plate (1), wherein a rotating plate (3) is rotatably mounted on the base plate (1), characterized in that, Also includes: The stretching assembly includes a back plate (12) fixed on a base plate (1), a pair of hydraulic rods (14) fixed on one side of the back plate (12), a top frame (20) fixed at the ends of the two hydraulic rods (14), a transmission column (21) fixed at the bottom of the top frame (20), a lifting block (22) fixed at the bottom end of the transmission column (21), a pair of sensor assemblies (23) fixed at the bottom side of the lifting block (22), and a C-shaped frame plate (24) fixed at the bottom side of the pair of sensor assemblies (23). Multiple lower clamping assemblies (5) are arranged on the rotating plate (3), and an upper clamping assembly (4) is arranged above each of the lower clamping assemblies (5). A gear ring drive assembly is used to drive the lower clamp assembly (5) and the upper clamp assembly (4) to clamp and release. The column (11) is fixed at the center of the rotating plate (3), and the outer peripheral wall of the column (11) is fixed with multiple guide grooves (19). The cantilever rods (7) are slidably installed in the guide grooves (19). Movable rods (18) are rotatably installed between the cantilever rods (7) and the guide grooves (19). Adjacent movable rods (18) are rotatably connected. Each of the lower clamping assemblies (5) includes a fixed clamping plate two (501) and a base block two (505) fixedly mounted on the rotating plate (3), and a movable clamping plate two (502) is provided between the fixed clamping plate two (501) and the base block two (505), and a pair of guide rods two (503) are fixed on the movable clamping plate two (502). The guide rods two (503) are slidably connected to the base block two (505), and a return spring two (504) is provided on the outer side of each guide rod two (503). Both ends are fixedly connected to the second base block (505) and the second movable clamping plate (502) respectively. Each of the upper clamping components (4) includes a mounting plate (402), and the bottom side of the mounting plate (402) is fixed with the first base block (407) and the first fixed clamping plate (403). A movable clamping plate (404) is provided between the first base block (407) and the first fixed clamping plate (403). A pair of guide rods (406) are fixed on the movable clamping plate (404). The guide rods (406) are slidably connected to the first base block (407). A return spring (405) is fitted on the outer side of each of the first rods (406). The two ends of the return spring (405) are fixedly connected to the first base block (407) and the first movable clamping plate (404) respectively. The middle ends of the first base block (407) and the second base block (505) are threaded with threaded posts (6), and one end of each threaded post (6) is fixed with a toothed end (601). The top of the mounting plate (402) is provided with an opening (9). A pair of L-shaped end rods (401) are fixed on the top of the mounting plate (402). The rod (401) is used to form an overlapping fit with the C-shaped frame plate (24). One side of the mounting plate (402) is fixedly connected to the cantilever rod (7). The toothed ring drive assembly includes a side arc plate one (16) and a side arc plate two (17) fixed on the base plate (1). A pair of upper toothed ring plates (161) are fixed on one side of the side arc plate one (16), and a pair of lower toothed ring plates (171) are fixed on one side of the side arc plate two (17). The upper toothed ring plates (161) and the lower toothed ring plates (171) are both adapted to the convex tooth end (601).

2. The PEXA tube tensile strength tester according to claim 1, characterized in that: The substrate (1) is fixed with a limiting ring plate (2), and the limiting ring plate (2) is rotatably connected to the rotating plate (3). The limiting ring plate (2) and the rotating plate (3) are coaxially arranged.

3. A PEXA tube tensile strength tester according to any one of claims 1-2, characterized in that: A mounting frame (15) is fixed to the top of the substrate (1). A pair of end tubes (151) are fixed to one side of the mounting frame (15). A conductive end (154) is provided inside the end tube (151). A guide rod (152) is slidably installed at the end of the end tube (151). A light-emitting plate (155) is fixed at the end of the two guide rods (152). A reset spring (153) is sleeved on both sides of the guide rod (152). The two ends of the reset spring (153) are fixedly connected to the end tube (151) and the light-emitting plate (155) respectively.

4. A PEXA tube tensile strength tester according to any one of claims 1-2, characterized in that: A U-shaped top frame (13) is fixed on one side of the back plate (12), and the end of the U-shaped top frame (13) is rotatably connected to the top of the column (11). A worm gear (252) is fixed at one end of the column (11) near the top. A drive motor (25) is fixed at the top of the U-shaped top frame (13). A worm (251) that meshes with the worm gear (252) is fixed on the output shaft of the drive motor (25). The helix angle between the worm gear (251) and the worm gear (252) is smaller than the friction angle.

5. A PEXA tube tensile strength tester according to claim 4, characterized in that: A display panel (10) is fixed on one side of the back plate (12), and a control panel (8) is fixed on the substrate (1). The control panel (8) is electrically connected to the drive motor (25) and the hydraulic rod (14). The display panel (10) is electrically connected to the sensor assembly (23) through the processor.

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