Anti-tensile testing device for PVC (polyvinyl chloride) water supply pipe

Abstract

The invention discloses a PVC water supply pipe tensile test device which comprises a working box, a tensile test support is fixedly connected between the two sides of the inner side wall of the working box, an open groove is formed in the side, away from the working box, of the tensile test support, a tensile lead screw is rotationally connected into the open groove, the tensile lead screw is in threaded connection with a threaded sleeve, and the threaded sleeve is in threaded connection with the working box. A stretching plate is fixedly connected between the two threaded sleeves, a fixing plate is fixedly connected to the side, far away from the separation groove, between the two sides of the inner side wall of the stretching testing support, and a stretching testing motor used for driving the stretching lead screw to rotate is arranged on the outer side wall of the working box. Through the cooperation of the working box, the tensile test bracket, the slot, the tensile screw rod, the threaded sleeve, the tensile plate, the fixed plate, the tensile test motor, the turntable, the clamping assembly, the ring stiffness test assembly, the simulation inclined plate, the UVLED array and the rotation driving assembly, the test efficiency of the equipment on a sample can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of pipe testing equipment technology, specifically to a tensile testing device for PVC water supply pipes. Background Technology

[0002] Due to their excellent pressure resistance, impact resistance, and tensile strength, PVC water supply pipes are widely used in municipal water supply and drainage, agricultural irrigation, and other fields. Their mechanical properties and weather resistance are key indicators affecting the quality and service life of projects. Therefore, testing their mechanical properties and weather resistance has become a crucial part of the PVC water supply pipe production process.

[0003] Existing tests for the mechanical properties and weather resistance of PVC water supply pipes are mostly conducted separately using tensile testing machines, ring stiffness testing machines, and PVC aging testing machines. Furthermore, it is necessary to test both dumbbell-shaped and tubular samples after cutting them separately in order to comprehensively evaluate the mechanical properties and durability of PVC water supply pipes in different application scenarios. During the testing process, staff need to transfer the samples to multiple testing instruments multiple times, which seriously affects the overall testing efficiency of the samples. Summary of the Invention

[0004] To address the shortcomings of existing technologies that require multiple transfers of samples to various testing instruments during the mechanical performance and weather resistance testing of PVC water supply pipes, which severely impacts the overall testing efficiency, this invention provides a tensile testing device for PVC water supply pipes.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention discloses a tensile testing device for PVC water supply pipes, comprising a working box, a tensile testing bracket fixedly connected between the two sides of the inner wall of the working box, a slot being formed on the side of the tensile testing bracket away from the working box, a tensile screw being rotatably connected in the slot, a threaded sleeve being threadedly connected to the tensile screw, a tensile plate being fixedly connected between the two threaded sleeves, a fixing plate being fixedly connected between the two sides of the inner wall of the tensile testing bracket away from the slot, and a tensile testing motor for driving the rotation of the tensile screw being provided on the outer wall of the working box. Both the tension plate and the fixing plate are rotatably connected to a turntable at their center. The turntable is equipped with a clamping assembly that can clamp both dumbbell-shaped and tubular specimens. The top wall of the working chamber is equipped with a ring stiffness testing assembly for compressive testing of tubular specimens. The inner side wall of the working chamber is fixedly connected to a simulated tilting plate above the tensile testing bracket. A UV LED array is provided on the simulated tilting plate. A rotation drive assembly for driving two turntables to rotate synchronously is provided on one side of the inner side wall of the working chamber.

[0006] As a preferred embodiment of the present invention, the clamping assembly includes a clamping cylinder, with slide rods fixedly connected to both sides of the inner wall of the clamping cylinder. Clamping sliders are slidably connected to both sides of the two slide rods. Clamping claws are fixedly connected to the side of the clamping slider away from the turntable. A groove is formed on the side of the clamping slider near the turntable. An inclined slide groove is formed on both sides of the inner wall of the groove. An inclined slider is slidably connected in the inclined slide groove. A connecting plate is fixedly connected to the end of the inclined slider away from the inclined slide groove. A clamping drive module for driving the connecting plate to move up and down is provided at the center of the upper surface of the connecting plate.

[0007] As a preferred embodiment of the present invention, the clamping drive module includes a rotating rod rotatably connected to the center of the upper surface of the connecting plate and a threaded groove formed at the center of the turntable. A threaded wall adapted to the threaded groove is fixedly connected to the side of the outer wall of the rotating rod near the threaded groove, and a rotating handle is fixedly connected to the end of the rotating rod away from the connecting plate.

[0008] As a preferred embodiment of the present invention, the outer wall of the clamping cylinder is provided with annularly and evenly distributed openings around its perimeter. A driving block is rotatably connected to the side of the rotating rod near the opening. A connecting rod is rotatably connected to the side of the outer wall of the driving block near the opening. A clamping plate is rotatably connected to the end of the connecting rod away from the driving block. A clamping limiting rod is fixedly connected to the four corners of the clamping plate near the clamping cylinder. A clamping limiting hole adapted to the clamping limiting rod is provided on the outer wall of the clamping cylinder.

[0009] As a preferred embodiment of the present invention, the ring stiffness testing assembly includes a pressing cylinder fixedly connected to the top wall of the working chamber, a pressure sensor fixedly connected to the output end of the pressing cylinder, a pressing plate fixedly connected to the bottom end of the pressure sensor, a base fixedly connected to the bottom wall of the working chamber, and a sample placement groove opened at the center of the upper surface of the base.

[0010] As a preferred embodiment of the present invention, a pressure limiting rod is fixedly connected to each of the four corners of the upper surface of the lower pressure plate, and a pressure limiting cylinder adapted to the pressure limiting rod is fixedly connected to each of the lower surfaces of the work box near the pressure limiting rod.

[0011] As a preferred embodiment of the present invention, the rotation drive assembly includes a transmission port opened on one side of the stretching plate and the fixed plate, a spline sleeve rotatably connected in the transmission port, a first toothed ring fixedly connected on the side of the turntable away from the clamping cylinder, a second toothed ring fixedly connected on the side of the spline sleeve close to the first toothed ring, a transmission chain for driving the first toothed ring to rotate with the second toothed ring provided on the first and second toothed rings, a rotation drive motor fixedly connected on one side of the inner wall of the work box, and a spline shaft adapted to the spline sleeve fixedly connected to the output end of the rotation drive motor.

[0012] As a preferred embodiment of the present invention, a detection tilting plate is fixedly connected to the inner side wall of the working box on the side below the tensile test bracket. A sliding groove is provided on the detection tilting plate, and a sliding plate is provided in the sliding groove. A detection lead screw is rotatably connected to one side of the inner side wall of the sliding groove. A limit rod is fixedly connected to the side of the inner side wall of the sliding groove away from the detection lead screw. A threaded hole adapted to the detection lead screw and a limit hole adapted to the limit rod are provided on the sliding plate. A detection drive motor for driving the detection lead screw to rotate is fixedly connected to one side of the outer side wall of the detection tilting plate. A detection component is provided on the side of the sliding plate near the clamping component.

[0013] As a preferred embodiment of the present invention, the detection component includes a camera and an infrared detector.

[0014] As a preferred embodiment of the present invention, a door is provided on one side of the outer wall of the working box, and an observation window is provided on the door, with a UV cut-off film provided on the observation window.

[0015] In summary, this application has the following beneficial effects: 1. This application utilizes a combination of a work box, tensile test bracket, slot, tensile screw, threaded sleeve, tensile plate, fixed plate, tensile test motor, turntable, clamping assembly, ring stiffness test assembly, simulated tilting plate, UVLED array, and rotation drive assembly. During use, operators can clamp dumbbell-shaped and tubular specimens using the clamping assembly. After clamping, the tensile test motor can drive the tensile screw to rotate, thereby moving the threaded sleeve and tensile plate away from the fixed plate to perform a tensile test on the specimen. Alternatively, the UVLED array can be activated, and the rotation drive assembly can be used to drive the turntable, clamping assembly, and the specimen clamped by the clamping assembly to rotate, simulating the effect of outdoor ultraviolet radiation on tubular specimens. Furthermore, the ring stiffness test assembly can be used to test the ring stiffness of the tubular specimen, thus effectively improving the equipment's testing efficiency for specimens. 2. This application, through the setup of a detection screw, a limiting rod, a threaded hole, a limiting hole, a detection drive motor, a camera, and an infrared detector, allows for the following functionality: During use, the detection drive motor can be activated to rotate the detection screw, thereby moving the slide along the screw and adjusting the positions of the camera and infrared detector. Simultaneously, the rotation drive motor can be activated to rotate the sample held by the clamping assembly. When clamping and stretching dumbbell-shaped and tubular samples, the camera can record the tensile deformation process, focusing on recording the necking phenomenon of dumbbell-shaped samples (e.g., the position and degree of necking change with tensile force) and the axial elongation of tubular samples, as well as whether bulges or cracks appear. Furthermore, when the sample generates frictional heat due to tensile deformation, the infrared detector can record the temperature rise area and temperature change amplitude. When using a UVLED array to irradiate the sample surface to simulate outdoor ultraviolet radiation, the camera can record the color change of the sample surface during irradiation (quantitatively analyzed using RGB values), and also record surface cracks and crack propagation. 3. By setting up an observation window and a UV cutoff membrane, this application allows staff to visually observe the test samples inside the device during testing. At the same time, the UV cutoff membrane effectively absorbs and reflects ultraviolet rays, preventing ultraviolet rays from leaking through the observation window to the outside of the working chamber, thereby improving the safety of staff during testing. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of a PVC water supply pipe tensile testing device according to the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of a PVC water supply pipe tensile testing device according to the present invention; Figure 3 This is a side sectional view of the tensile strength testing device for PVC water supply pipes according to the present invention. Figure 4 This is a three-dimensional structural diagram of the tensile plate of a PVC water supply pipe tensile testing device according to the present invention. Figure 5 This is a schematic diagram of the main sectional view of the clamping assembly of the PVC water supply pipe tensile testing device of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the clamping cylinder of the PVC water supply pipe tensile testing device of the present invention; Figure 7This is a three-dimensional cross-sectional view of the clamping component of the PVC water supply pipe tensile testing device of the present invention; Figure 8 This is a three-dimensional structural diagram of the clamping plate of the PVC water supply pipe tensile testing device of the present invention; Figure 9 This is a schematic diagram of the simulated inclined plate three-dimensional structure of a PVC water supply pipe tensile testing device according to the present invention; Figure 10 This is a three-dimensional structural diagram of the fixing plate of the PVC water supply pipe tensile testing device of the present invention; Figure 11 This is a three-dimensional structural diagram of the spline sleeve of the tensile strength testing device for PVC water supply pipes according to the present invention; Figure 12 This is a three-dimensional structural diagram of the detection inclined plate of the PVC water supply pipe tensile testing device of the present invention; Figure 13 This is a schematic diagram of the three-dimensional structure of the sliding plate of the PVC water supply pipe tensile testing device of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Working box; 2. Tensile test bracket; 3. Slotted; 4. Tensile lead screw; 5. Threaded sleeve; 6. Tensile plate; 7. Fixing plate; 8. Tensile test motor; 9. Turntable; 10. Clamping assembly; 11. Ring stiffness test assembly; 12. Simulated tilting plate; 13. UVLED array; 14. Rotation drive assembly; 101. Clamping cylinder; 102. Slide rod; 103. Clamping slider; 104. Clamping claw; 105. Groove; 106. Tilted slide; 107. Tilted slider; 108. Connecting plate; 109. Clamping drive module; 1091. Rotating rod; 1092. Threaded groove; 1093. Threaded wall; 1094. Rotating handle; 1010. Opening; 1011. Drive block; 1012. Connecting rod; 1013. Clamping plate; 1014. Clamping limit rod; 1015. Clamping limit hole; 111. Pressing cylinder; 112. Pressure sensor; 113. Pressing plate; 114. Base; 115. Sample slot; 116. Pressing limit rod; 117. Pressing limit cylinder; 141. Transmission port; 142. Spline sleeve; 143. First gear ring; 144. Second gear ring; 145. Transmission chain; 146. Rotation drive motor; 147. Spline shaft; 15. Detection tilt plate; 16. Slide groove; 17. Slide plate; 18. Detection screw; 19. Limit rod; 20. Threaded hole; 21. Limit hole; 22. Detection drive motor; 23. Detection assembly; 231. Camera; 232. Infrared detector; 24. Box door; 25. Observation window; 26. UV cut-off membrane. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example: Refer to Figure 1 , Figure 2 and Figure 3 This invention discloses a tensile testing device for PVC water supply pipes, comprising a working box 1, a tensile testing bracket 2 fixedly connected between the two sides of the inner wall of the working box 1, a slot 3 opened on the side of the tensile testing bracket 2 away from the working box 1, a tensile screw 4 rotatably connected in the slot 3, a threaded sleeve 5 threadedly connected to the tensile screw 4, a tensile plate 6 fixedly connected between the two threaded sleeves 5, a fixing plate 7 fixedly connected on the side of the inner wall of the tensile testing bracket 2 away from the slot 3, a tensile testing motor 8 for driving the rotation of the tensile screw 4 provided on the outer wall of the working box 1, a box door 24 provided on one side of the outer wall of the working box 1, an observation window 25 provided on the box door 24, and a UV cut-off film 26 provided on the observation window 25.

[0020] Reference Figure 2 and Figure 4 Both the tensile plate 6 and the fixed plate 7 are rotatably connected to a turntable 9 at their center. The turntable 9 is equipped with a clamping assembly 10 that can clamp both dumbbell-shaped and tubular specimens. In use, first, start the two tensile test motors 8 to drive the two tensile screws 4 to rotate synchronously and drive the two threaded sleeves 5 to rotate synchronously towards the side closer to the fixed plate 7 until the distance between the two clamping assemblies 10 matches the length of the specimen (which can be either a dumbbell-shaped or a tubular specimen). Then, clamp both ends of the specimen through the clamping assembly 10. After clamping, start the two tensile test motors 8 again to drive the two tensile screws 4 to rotate synchronously and drive the two threaded sleeves 5 to move synchronously away from the fixed plate 7, thereby moving the tensile plate 6 away from the fixed plate 7 to perform a tensile test on the specimen.

[0021] Reference Figure 5 , Figure 6 and Figure 7 The clamping assembly 10 includes a clamping cylinder 101. Slide rods 102 are fixedly connected to both sides of the inner wall of the clamping cylinder 101. Clamping sliders 103 are slidably connected to both sides of the slide rods 102. Clamping claws 104 are fixedly connected to the side of the clamping sliders 103 away from the turntable 9. Grooves 105 are formed on the side of the clamping sliders 103 near the turntable 9. Inclined grooves 106 are formed on both sides of the inner wall of the grooves 105. Inclined sliders 107 are slidably connected in the inclined grooves 106. A connecting plate 108 is fixedly connected to the end of the inclined sliders 107 away from the inclined grooves 106. A clamping drive module 109 for driving the connecting plate 108 to move up and down is provided at the center of the upper surface of the connecting plate 108.

[0022] Reference Figure 6 , Figure 7 and Figure 8 The clamping drive module 109 includes a rotating rod 1091 rotatably connected to the center of the upper surface of the connecting plate 108 and a threaded groove 1092 opened at the center of the turntable 9. A threaded wall 1093 adapted to the threaded groove 1092 is fixedly connected to the side of the outer wall of the rotating rod 1091 near the threaded groove 1092. A rotating handle 1094 is fixedly connected to the end of the rotating rod 1091 away from the connecting plate 108. When it is necessary to clamp the dumbbell-shaped sample, the end of the dumbbell-shaped sample is first placed between the two clamping claws 104. Then, the rotating rod 1091 is driven to rotate by rotating the handle 1094. The rotating rod 1091 and the connecting plate 108 are driven to move away from the clamping claws 104 through the threaded wall 1093 and the threaded groove 1092. Then, the two clamping sliders 103 are driven to move towards each other through the inclined slider 107 and the inclined groove 106, so that the clamping claws 104 fixedly connected to the two clamping sliders 103 clamp the two ends of the dumbbell-shaped sample. The outer wall of the clamping cylinder 101 has annularly distributed openings 1010 around its perimeter. A driving block 1011 is rotatably connected to the side of the rotating rod 1091 near the opening 1010. A connecting rod 1012 is rotatably connected to the side of the outer wall of the driving block 1011 near the opening 1010. A clamping plate 1013 is rotatably connected to the end of the connecting rod 1012 away from the driving block 1011. A clamping limiting rod 1014 is fixedly connected to the four corners of the clamping plate 1013 near the clamping cylinder 101. A clamping limiting hole 1015 is provided on the outer wall of the clamping cylinder 101 to match the clamping limiting rod 1014. When it is necessary to clamp the tubular sample, first, the two ends of the tubular sample are sleeved on the two clamping components 10. Then, by rotating the handle 1094, the rotating rod 1091 is driven to rotate. The rotating rod 1091 and the connecting plate 108 are driven to move closer to the clamping claw 104 through the threaded wall 1093 and the threaded groove 1092. This drives the driving block 1011 to move closer to the clamping claw 104. During this process, the connecting rod 1012 pushes the clamping plate 1013 radially away from the driving block 1011 (when the clamping plate 1013 moves away from the driving block 1011, the clamping limiting rod 1014 and the clamping limiting hole 1015 limit the clamping plate 1013, thereby ensuring that the clamping plate 1013 can only move radially away from the driving block 1011), thus clamping the tubular sample.

[0023] Reference Figure 2 and Figure 3The top wall of the working chamber 1 is provided with a ring stiffness testing assembly 11 for compressive strength testing of tubular samples. The ring stiffness testing assembly 11 includes a pressing cylinder 111 fixedly connected to the top wall of the working chamber 1. A pressure sensor 112 is fixedly connected to the output end of the pressing cylinder 111. A pressing plate 113 is fixedly connected to the bottom end of the pressure sensor 112. A base 114 is fixedly connected to the bottom wall of the working chamber 1. A sample placement groove 115 is opened in the center of the upper surface of the base 114. Pressing limit rods 116 are fixedly connected to the four corners of the upper surface of the pressing plate 113. Pressing limit cylinders 117 that are adapted to the pressing limit rods 116 are fixedly connected to the side of the lower surface of the working chamber 1 near the pressing limit rods 116. When the ring stiffness test of the specimen is required, the tubular specimen is first placed in the sample placement groove 115. Then, the pressing cylinder 111 drives the pressing plate 113 to move downward (two tensile test motors 8 are started in advance to drive the two tensile screws 4 to rotate and drive the two threaded sleeves 5 and the tensile plate 6 to move away from the fixed plate 7 as much as possible to avoid the tensile plate 6 interfering with the pressing path of the pressing plate 113). After the pressing plate 113 touches the tubular specimen, it continues to apply radial pressure to the specimen at a set speed. The specimen gradually undergoes radial deformation under the pressure (the pressure sensor 112 can record the pressure). When the deformation of the tubular specimen reaches 5% of the diameter and the pressure reaches the set threshold, the pressing stops, and the pressure and deformation values ​​are recorded to calculate the ring stiffness.

[0024] Reference Figure 2 , Figure 3 and Figure 9 A simulated tilting plate 12 is fixedly connected to the inner wall of the working box 1 above the tensile test bracket 2. A UV LED array 13 is provided on the simulated tilting plate 12. A rotation drive assembly 14 for driving the two turntables 9 to rotate synchronously is provided on one side of the inner wall of the working box 1.

[0025] Reference Figure 4 , Figure 10 and Figure 11 The rotation drive assembly 14 includes a transmission port 141 opened on one side of the stretching plate 6 and the fixed plate 7. A spline sleeve 142 is rotatably connected in the transmission port 141. A first toothed ring 143 is fixedly connected on the side of the turntable 9 away from the clamping cylinder 101. A second toothed ring 144 is fixedly connected on the side of the spline sleeve 142 close to the first toothed ring 143. A transmission chain 145 for driving the first toothed ring 143 to rotate with the second toothed ring 144 is provided on the first toothed ring 143 and the second toothed ring 144. A rotary drive motor 146 is fixedly connected to one side of the inner wall of the working box 1. The output end of the rotary drive motor 146 is fixedly connected to a spline shaft 147 that is compatible with the spline sleeve 142. In use, the sample can be clamped by the clamping assembly 10 first, then the UVLED array 13 is turned on, and the rotary drive motor 146 is started to drive the spline shaft 147 to rotate. When the spline shaft 147 rotates, it can drive the second toothed ring 144 to rotate through the spline sleeve 142, and then drive the first toothed ring 143 and the turntable 9 to rotate through the transmission chain 145. This drives the two clamping assemblies 10 and the tubular sample clamped between the clamping assemblies 10 to rotate at a uniform speed, so that the sample surface is uniformly irradiated by the UVLED array to simulate the effect of outdoor ultraviolet radiation on the tubular sample.

[0026] Reference Figure 2 , Figure 12 and Figure 13 A detection tilting plate 15 is fixedly connected to the inner wall of the working box 1 on the side below the tensile test bracket 2. A slide groove 16 is provided on the detection tilting plate 15, and a slide plate 17 is provided in the slide groove 16. A detection lead screw 18 is rotatably connected to one side of the inner wall of the slide groove 16. A limit rod 19 is fixedly connected to the side of the inner wall of the slide groove 16 away from the detection lead screw 18. A threaded hole 20 adapted to the detection lead screw 18 and a limit hole 21 adapted to the limit rod 19 are provided on the slide plate 17. A detection drive motor 22 for driving the detection lead screw 18 to rotate is fixedly connected to one side of the outer wall of the detection tilting plate 15. A detection assembly is provided on the side of the slide plate 17 near the clamping assembly 10. The detection assembly 23 includes a camera 231 and an infrared detector 232. The tensile test motor 8, the rotation drive motor 146, the detection drive motor 22, the pressing cylinder 111, the pressure sensor 112, the infrared detector 24, the camera 23 and the UVLED array 13 are all electrically connected to the control panel (not shown in the figure). In use, the detection drive motor 22 can be started to drive the detection lead screw 18 to rotate, thereby driving the slide plate 17 to move along the detection lead screw 18 (during this process, the limiting rod 19 and the limiting hole 21 limit the slide plate 17), thereby adjusting the position of the camera 231 and the infrared detector 232. At the same time, the rotation drive motor 146 can be started to rotate the sample held by the clamping assembly 10. When clamping and stretching dumbbell-shaped and tubular samples, the camera 231 can record the tensile deformation process of the sample, focusing on recording the necking phenomenon of dumbbell-shaped samples (such as the necking position and the degree of necking change with the tensile force) and the axial elongation of tubular samples and whether bulges or cracks appear. At the same time, when the sample generates frictional heat due to tensile deformation, the infrared detector 232 can record the temperature rise area and the temperature change range. When the UVLED array 13 is used to irradiate the sample surface to simulate outdoor ultraviolet irradiation, the camera 231 can record the color change of the sample surface during the irradiation process (quantitative analysis through RGB values), and at the same time record the cracks and crack propagation on the sample surface.

[0027] The implementation principle of this invention is as follows: When using the clamping assembly 10 to clamp the dumbbell-shaped sample, first place the end of the dumbbell-shaped sample between the two clamping jaws 104, then rotate the handle 1094 to drive the rotating rod 1091 to rotate, and drive the rotating rod 1091 and the connecting plate 108 to move away from the clamping jaws 104 through the threaded wall 1093 and the threaded groove 1092. Then, drive the two clamping sliders 103 to move towards each other through the inclined slider 107 and the inclined groove 106, so that the clamping jaws 104 fixedly connected to the two clamping sliders 103 clamp the two ends of the dumbbell-shaped sample. When clamping components 10 are needed to clamp the tubular sample, the two ends of the tubular sample are first sleeved onto the two clamping components 10. Then, by rotating the handle 1094, the rotating rod 1091 is driven to rotate. The rotating rod 1091 and the connecting plate 108 are driven to move closer to the clamping claw 104 through the threaded wall 1093 and the threaded groove 1092. This drives the driving block 1011 to move closer to the clamping claw 104. During this process, the connecting rod 1012 pushes the clamping plate 1013 radially away from the driving block 1011 (when the clamping plate 1013 moves away from the driving block 1011, the clamping limiting rod 1014 and the clamping limiting hole 1015 limit the clamping plate 1013, thereby ensuring that the clamping plate 1013 can only move radially away from the driving block 1011), thus clamping the tubular sample. After the specimen (which can be a dumbbell-shaped specimen or a tubular specimen) is clamped by the clamping assembly 10, when a tensile test is required, the two tensile test motors 8 can be started to drive the two tensile screws 4 to rotate synchronously and drive the two threaded sleeves 5 to rotate synchronously towards the side closer to the fixed plate 7 until the distance between the two clamping assemblies 10 is matched with the length of the specimen. Then, the two ends of the specimen are clamped by the clamping assembly 10. After clamping, the two tensile test motors 8 are started again to drive the two tensile screws 4 to rotate synchronously and drive the two threaded sleeves 5 to move synchronously away from the fixed plate 7, thereby driving the tensile plate 6 to move away from the fixed plate 7 to perform a tensile test on the specimen. During tensile testing, the operator can activate the detection drive motor 22 to drive the detection lead screw 18 to rotate, thereby moving the slide plate 17 along the detection lead screw 18 and adjusting the positions of the camera 231 and the infrared detector 232. Simultaneously, the operator can activate the rotation drive motor 146 to rotate the sample held by the clamping assembly 10. When clamping and stretching dumbbell-shaped and tubular samples, the camera 231 can record the tensile deformation process of the sample, focusing on recording the necking phenomenon of dumbbell-shaped samples (such as the position and degree of necking change with tensile force) and the axial elongation of tubular samples and whether bulges or cracks appear. At the same time, when the sample generates frictional heat due to tensile deformation, the infrared detector 232 can record the temperature rise area and the temperature change range. After the tubular sample is clamped by the clamping assembly 10, the operator can also turn on the UVLED array 13 and start the rotation drive motor 146 to drive the spline shaft 147 to rotate. When the spline shaft 147 rotates, it can drive the second toothed ring 144 to rotate through the spline sleeve 142, and then drive the first toothed ring 143 and the turntable 9 to rotate through the transmission chain 145. This causes the two clamping assemblies 10 and the tubular sample clamped between the clamping assemblies 10 to rotate at a uniform speed, so that the sample surface is uniformly irradiated by the UVLED array to simulate the effect of outdoor ultraviolet radiation on the tubular sample. When the UVLED array 13 is used to irradiate the sample surface to simulate outdoor ultraviolet irradiation, the camera 231 can record the color change of the sample surface during the irradiation process (quantitative analysis through RGB values), and at the same time record the cracks and crack propagation of the sample surface. When the ring stiffness test of the specimen is required, the tubular specimen is first placed in the sample placement groove 115. Then, the pressing cylinder 111 drives the pressing plate 113 to move downward (two tensile test motors 8 are started in advance to drive the two tensile screws 4 to rotate and drive the two threaded sleeves 5 and the tensile plate 6 to move away from the fixed plate 7 as much as possible to avoid the tensile plate 6 interfering with the pressing path of the pressing plate 113). After the pressing plate 113 touches the tubular specimen, it continues to apply radial pressure to the specimen at a set speed. The specimen gradually undergoes radial deformation under the pressure (the pressure sensor 112 can record the pressure). When the deformation of the tubular specimen reaches 5% of the diameter and the pressure reaches the set threshold, the pressing stops, and the pressure and deformation values ​​are recorded to calculate the ring stiffness. During tensile testing, ring stiffness testing, and simulated outdoor ultraviolet radiation, the chamber door 24 should be closed. During the testing process, staff can observe the testing process through the observation window 25. At the same time, the UV cut-off film 26 can effectively absorb and reflect the ultraviolet rays generated by the UV LED array 13.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tensile strength testing device for PVC water supply pipes, comprising a working box (1), characterized in that: A tensile test bracket (2) is fixedly connected between the two sides of the inner wall of the working box (1). A slot (3) is provided on the side of the tensile test bracket (2) away from the working box (1). A tensile screw (4) is rotatably connected in the slot (3). A threaded sleeve (5) is threaded on the tensile screw (4). A tensile plate (6) is fixedly connected between the two threaded sleeves (5). A fixing plate (7) is fixedly connected between the two sides of the inner wall of the tensile test bracket (2) away from the slot (3). A tensile test motor (8) for driving the tensile screw (4) to rotate is provided on the outer wall of the working box (1). The center of the tension plate (6) and the fixing plate (7) are both rotatably connected to a turntable (9), and the turntable (9) is provided with a clamping component (10) that can clamp both dumbbell-shaped specimens and tubular specimens. The top wall of the work box (1) is provided with a ring stiffness testing component (11) for compressive testing of tubular specimens. The inner side wall of the work box (1) is fixedly connected above the tensile test bracket (2) with a simulated tilting plate (12). A UV LED array (13) is provided on the simulated tilting plate (12). A rotation drive component (14) for driving two turntables (9) to rotate synchronously is provided on one side of the inner side wall of the work box (1).

2. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The clamping assembly (10) includes a clamping cylinder (101). Slide rods (102) are fixedly connected to both sides of the inner wall of the clamping cylinder (101). Clamping sliders (103) are slidably connected to both sides of the two slide rods (102). Clamping claws (104) are fixedly connected to the side of the clamping sliders (103) away from the turntable (9). Grooves (105) are provided on the side of the clamping sliders (103) close to the turntable (9). Inclined slide grooves (106) are provided on both sides of the inner wall of the grooves (105). Inclined sliders (107) are slidably connected in the inclined slide grooves (106). A connecting plate (108) is fixedly connected to the end of the inclined sliders (107) away from the inclined slide grooves (106). A clamping drive module (109) for driving the connecting plate (108) to move up and down is provided at the center of the upper surface of the connecting plate (108).

3. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The clamping drive module (109) includes a rotating rod (1091) rotatably connected to the center of the upper surface of the connecting plate (108) and a threaded groove (1092) opened at the center of the turntable (9). A threaded wall (1093) adapted to the threaded groove (1092) is fixedly connected to the side of the outer wall of the rotating rod (1091) near the threaded groove (1092). A rotating handle (1094) is fixedly connected to the end of the rotating rod (1091) away from the connecting plate (108).

4. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The outer wall of the clamping cylinder (101) has annularly distributed openings (1010) around its perimeter. The rotating rod (1091) is rotatably connected to a driving block (1011) on the side near the opening (1010). The outer wall of the driving block (1011) is rotatably connected to a connecting rod (1012) on the side near the opening (1010). The end of the connecting rod (1012) away from the driving block (1011) is rotatably connected to a clamping plate (1013). The clamping plate (1013) is fixedly connected to clamping limiting rods (1014) at the four corners on the side near the clamping cylinder (101). The outer wall of the clamping cylinder (101) has clamping limiting holes (1015) that are adapted to the clamping limiting rods (1014).

5. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The ring stiffness testing assembly (11) includes a pressure cylinder (111) fixedly connected to the top wall of the working box (1). A pressure sensor (112) is fixedly connected to the output end of the pressure cylinder (111). A pressure plate (113) is fixedly connected to the bottom end of the pressure sensor (112). A base (114) is fixedly connected to the bottom wall of the working box (1). A sample placement groove (115) is opened at the center of the upper surface of the base (114).

6. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The lower pressure plate (113) has four corners of the upper surface fixedly connected with a lower pressure limiting rod (116), and the lower surface of the work box (1) is fixedly connected with a lower pressure limiting cylinder (117) that is compatible with the lower pressure limiting rod (116) on the side of the lower surface of the work box (1).

7. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The rotation drive assembly (14) includes a transmission port (141) opened on one side of the stretching plate (6) and the fixing plate (7). A spline sleeve (142) is rotatably connected in the transmission port (141). A first toothed ring (143) is fixedly connected on the side of the turntable (9) away from the clamping cylinder (101). A second toothed ring (144) is fixedly connected on the side of the spline sleeve (142) close to the first toothed ring (143). A transmission chain (145) for driving the first toothed ring (143) to rotate with the second toothed ring (144) is provided on the first toothed ring (143) and the second toothed ring (144). A rotation drive motor (146) is fixedly connected on one side of the inner wall of the work box (1). A spline shaft (147) adapted to the spline sleeve (142) is fixedly connected to the output end of the rotation drive motor (146).

8. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: A detection tilting plate (15) is fixedly connected to the inner wall of the work box (1) below the tensile test bracket (2). A slide groove (16) is provided on the detection tilting plate (15). A slide plate (17) is provided in the slide groove (16). A detection lead screw (18) is rotatably connected to one side of the inner wall of the slide groove (16). A limit rod (19) is fixedly connected to the side of the inner wall of the slide groove (16) away from the detection lead screw (18). A threaded hole (20) adapted to the detection lead screw (18) and a limit hole (21) adapted to the limit rod (19) are provided on the slide plate (17). A detection drive motor (22) for driving the detection lead screw (18) to rotate is fixedly connected to one side of the outer wall of the detection tilting plate (15). A detection component (23) is provided on the side of the slide plate (17) near the clamping component (10).

9. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: The detection component (23) includes a camera (231) and an infrared detector (232).

10. The tensile strength testing device for PVC water supply pipes according to claim 1, characterized in that: A door (24) is provided on one side of the outer wall of the work box (1), and an observation window (25) is provided on the door (24), and a UV cut-off film (26) is provided on the observation window (25).

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