A compression resistance detection device and method for PE pipe manufacturing

Abstract

The application discloses a kind of compression detection device and method based on PE pipe manufacturing, including detection box, the outside of detection box is provided with infusion piece to realize the liquid flow control of pipe compression detection, and the inside of detection box is provided with sealing positioning mechanism for fixing and sealing to different specifications of PE pipe to be detected, and the application relates to the technical field of pipe pressure detection.The compression detection device and method based on PE pipe manufacturing, by setting moving part, servo motor drives positive and negative thread rod to rotate, drives the moving block assembled on slide rail to slide oppositely or reversely, can freely adjust the installation spacing of two groups of positioning parts, can adapt to different length specifications of PE pipe to be measured, solve the industry pain point that different length pipes are clamped and positioned complicatedly, while cooperating with the lower clamp block in positioning part and the upper clamp block of clamping part to realize pipe vertical clamping limiting, complete pipe reliable clamping from length, radial two dimensions, greatly simplify pipe feeding and positioning process.

Description

Technical Field

[0001] This invention relates to the field of pipe pressure testing technology, specifically to a pressure testing device and method for PE pipe manufacturing. Background Technology

[0002] PE pipes are made of polyethylene plastic and are one of the most basic types of plastic pipes. They are corrosion-resistant, impact-resistant, and have a long service life, and are mainly used for water supply and gas pipes.

[0003] The reference title is: A pressure resistance testing device for PE pipe manufacturing (Publication No.: CN121783718A, Publication Date: 2026-04-03). It includes a working platform with a lifting mechanism connected to a constant pressure pressing structure. A pressure supply component connected to the constant pressure pressing structure is also installed on the working platform to stabilize its pressing pressure. Two sets of limiting support components are provided on the working platform to support and limit the pipe to be tested. A transmission component is also provided on the working platform. Through the coordinated action of the lifting mechanism, transmission component, and limiting support component, a fully automated continuous testing cycle is achieved, including single-press testing, automatic reset, driving the pipe to rotate a preset circumferential distance, and preparing for the next test, thus improving testing efficiency and automation level.

[0004] Based on the above description, existing PE pipes, in addition to external pressure testing, also require water pressure testing. However, during the testing process, due to the cumbersome clamping and positioning of pipes of different lengths and the failure to calibrate the coaxiality of the sealing ends after changing pipes of different specifications, there are problems such as outlet obstruction or sealing performance being affected during water pressure testing. Therefore, this invention provides a pressure testing device and method based on PE pipe manufacturing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pressure testing device and method for PE pipe manufacturing, which solves the problems of existing PE pipes lacking an integrated water pressure resistance testing structure, and the cumbersome clamping of pipes of different lengths and the inability to match different pipe diameters to ensure coaxiality during pressure testing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pressure testing device for PE pipe manufacturing, comprising a testing chamber, a liquid infusion fitting on the outside of the testing chamber for controlling the liquid flow during pipe pressure testing, and a sealing and positioning mechanism inside the testing chamber for fixing and sealing PE pipes of different specifications, and completing the pressure testing through the liquid infusion fitting. The sealing and positioning mechanism includes: The positioning section limits the position of the PE pipe to be tested after it is placed, and simultaneously adjusts the position of the sealing section. The sealing part includes a symmetrical sealing cover, and the sealing cover can be adjusted vertically by an abutment unit installed on the positioning part. The inner side of the sealing cover is provided with mating grooves of different diameters, and sealing rings of corresponding sizes are installed at the mating grooves respectively. The symmetrical sealing cover surface is fixedly connected to an inlet pipe and an outlet pipe, and both the inlet pipe and the outlet pipe are connected to the liquid delivery component. The sealing cover is provided with a liquid flow channel, and the outlet end of the liquid flow channel is located at the center of the circular inner wall of the sealing cover. The movable component allows for the overall movement of the positioning and sealing parts, facilitating placement to accommodate the length of the PE pipe to be tested.

[0007] Preferably, the infusion device includes a water tank and an infusion booster pump, wherein the infusion booster pump is connected to the water tank, and the output pipe of the infusion booster pump is connected to a control valve. A pressure gauge is installed on the control valve to monitor the pressure, and the port of the control valve is fixedly connected to the inlet pipe and the outlet pipe.

[0008] Preferably, the positioning part includes: The lower base has a clamping block installed in the middle of the top, and a moving block installed at the bottom of the lower base. The upper cover has a support rod rotatably connected to one end via a rotating rod. The bottom end of the support rod is fixed to the arc-shaped end face of the top of the lower base. The other end of the upper cover has a slot, while a limit plate is fixedly installed on the arc-shaped end face of the top of the lower base. When the slot and the limit plate are engaged, the upper cover and the lower base are parallel and form a closed area. The upper cover is equipped with a clamping component that works with the lower clamping block to clamp the PE pipe to be tested. Furthermore, after the upper cover is rotated to be parallel with the lower base, the upper cover and the lower base are fixed in place by the set buckle.

[0009] Preferably, the clamping member includes a threaded post, a rotating handle is fixedly installed at the top of the threaded post, the threaded post passes through the upper cover and is threadedly connected to the upper cover, and a lower moving block is rotatably installed at the bottom of the threaded post. The lower moving block is slidably connected to a protrusion on the inner side of the upper cover. An upper clamping block is installed at the bottom of the lower moving block, and the upper clamping block and the lower clamping block are vertically opposite each other. When the threaded post rotates, the lower moving block moves to a vertical position.

[0010] Preferably, the fastener includes a hook, one end of which is rotatably mounted on the side wall of the upper cover via a fixing bolt, while a locking block is installed on the side of the lower base. After rotating around the fixing bolt, the hook engages with the lower side of the locking block.

[0011] Preferably, the abutment unit includes: An L-shaped block is installed on the side of the lower block, and a square frame is installed at the extended end of the L-shaped block. An elastic element is set inside the square frame to allow the vertical rod to move in the vertical direction. The connecting frame is fixedly installed on the surface of the vertical rod and moves vertically with the movement of the vertical rod. A support plate is installed at the end of the connecting frame, and a pneumatic component is used to move the sealing cover horizontally at the support plate. A concave block is fixedly installed on the side of the sealing cover, and the concave opening of the concave block slides in contact with the connecting frame.

[0012] Preferably, the elastic element includes: A parallel block is located inside a square frame and is fixedly installed at the top of a vertical rod. A sliding strip is installed on the inner wall of the square frame. The parallel block passes through the sliding strip and slides relative to the sliding strip. A support is installed at the top of the parallel block. A stop spring is sleeved on the support. The two ends of the stop spring are fixed to the opposite sides of the parallel block and the square frame. The restoring force of the stop spring when it is not affected by other external forces causes the parallel block to move downward. The wheel cover is fixedly installed at the bottom of the vertical rod, and the inside of the wheel cover is rotatably installed with a stop wheel through a rotating pin. After the lower block moves down, the stop wheel contacts the arc-shaped end face on the other side of the top of the lower base.

[0013] Preferably, the pneumatic component includes a control cylinder fixedly installed at the center of the side of the support plate. A piston rod is slidably installed inside the control cylinder, and the end of the piston rod extends through to one side of the support plate and is fitted with a push plate. Connecting rods are circumferentially and equidistantly installed on the side of the push plate relative to the sealing cover to fix the push plate and the sealing cover.

[0014] Preferably, the moving component includes a servo motor fixedly installed on the inner wall of the testing box. One end of the output shaft of the servo motor is equipped with a positive and negative threaded rod via a coupling, and the extension end of the positive and negative threaded rod is fixed to the inner wall of the testing box. The positive and negative threads of the positive and negative threaded rod pass through and are threadedly connected to the moving block. A slide rail is installed at the bottom of the inner cavity of the testing box, and the moving block slides horizontally on the slide rail.

[0015] This invention also discloses a compressive strength testing method for PE pipe manufacturing, specifically including the following steps: S1. Based on the length of the PE pipe to be tested, the range is roughly determined using the moving part, and then the PE pipe to be tested is placed on the positioning part for limiting and fixing. S2, the PE pipe limiting and fixing synchronization enables the abutment unit to achieve a symmetrical sealing cover corresponding to the center line of the pipe, and the operation makes the sealing cover seal both ends of the PE pipe to be tested. S3. Finally, the liquid is transferred through the infusion fitting, forming a closed flow loop through the inlet pipe, flow channel, PE pipe to be tested, and outlet pipe, and different pressures are switched to complete the pressure resistance test of the PE pipe to be tested.

[0016] This invention provides a pressure testing device and method for PE pipe manufacturing. Compared with the prior art, it has the following advantages: 1. This pressure testing device and method for PE pipe manufacturing uses a moving part and a servo motor to drive the positive and negative threaded rods to rotate, which in turn causes the moving blocks mounted on the slide rail to slide in opposite directions. The installation distance between the two sets of positioning parts can be freely adjusted, which can adapt to PE pipes of different lengths and specifications. This solves the industry pain point of cumbersome clamping and positioning of pipes of different lengths. At the same time, the lower clamping block inside the positioning part and the upper clamping block of the clamping part realize the vertical clamping and limiting of the pipe. The reliable clamping of the pipe is completed from both length and radial dimensions, which greatly simplifies the pipe loading, unloading and positioning process.

[0017] 2. This pressure testing device and method for PE pipe manufacturing uses a stop unit installed on the side wall of the lower block of the positioning part. When the rotating handle of the rotating clamping part and the drive threaded column drive the lower block to press down and clamp the pipe, the lower block, along with the L-shaped block and the square frame, moves down synchronously. The stop wheel rolls along the arc-shaped end face of the lower base. Relying on the elastic compensation effect of the stop spring, the vertical rod is raised and lowered. The vertical height of the sealing cover of the sealing part is adjusted synchronously through the connecting frame and the support plate. It can automatically correct the axis of the sealing cover and the axis of the pipe according to the outer diameter of PE pipes of different diameters, ensuring that the sealing cover and the pipe under test are accurately coaxial. This avoids defects caused by coaxiality deviation, such as poor sealing of the sealing ring and obstruction of the flow channel by the end face of the pipe.

[0018] 3. This pressure resistance testing device and method for PE pipe manufacturing involves creating multi-sized butt joint grooves on the inner side of a sealing cover. Each groove is fitted with a sealing ring matching the pipe diameter. Combined with pneumatic components on the side of a support plate, a control cylinder pushes the sealing cover horizontally against both ends of the pipe via a piston rod, push plate, and multiple circumferentially arranged connecting rods. Pipes of different diameters can be embedded into the corresponding butt joint grooves. End sealing is achieved by continuous pressure stabilization and locking by the cylinder. Furthermore, a water tank, a booster pump, and a control valve in the infusion unit allow high-pressure water to flow into the pipe cavity through the inlet pipe and the internal flow channel of the sealing cover, ultimately returning from the outlet pipe to form a closed water pressure loop. This achieves integrated testing of pipe clamping and positioning, end sealing, and water pressure resistance, eliminating the need to disassemble the equipment and complete the clamping and water pressure test step-by-step. The high degree of integration, coupled with a graded pressure-adjusting control valve, allows for segmented control of the test water pressure, accurately collecting data on the pressure resistance, leakage, and damage of PE pipes under different pressures, thus improving the accuracy of product pressure resistance testing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional perspective view of the detection box of the present invention; Figure 3 This is a three-dimensional structural diagram of the internal structure of the testing box of the present invention; Figure 4 This is an overall structural diagram of the positioning part and the sealing part of the present invention; Figure 5 This is a three-dimensional structural diagram of the clamping component of the present invention; Figure 6 This is a three-dimensional structural diagram of the positioning part of the present invention; Figure 7 This is a three-dimensional structural diagram of the abutment unit of the present invention; Figure 8 This is a cross-sectional perspective view of the abutment unit of the present invention; Figure 9 This is a three-dimensional structural diagram of the elastic element of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of the local structure at point A in the middle; Figure 11 This is a three-dimensional structural cross-sectional view of the sealing part of the present invention.

[0020] In the diagram: 1-Detection box, 2-Infusion component, 21-Water tank, 22-Infusion booster pump, 23-Control valve, 3-Positioning part, 31-Lower base, 32-Lower clamping block, 33-Moving block, 34-Upper cover seat, 35-Rotating rod, 36-Support rod, 37-Slot, 38-Clamping component, 381-Threaded post, 382-Rotating handle, 383-Lower moving block, 384-Upper clamping block, 39-Snap fastener, 391-Hook, 392-Fixing bolt, 393-Clamping block, 310-Limiting plate, 4-Sealing part, 41-Sealing cover, 42-Matching groove, 43-Sealing ring 44-Inlet pipe, 45-Outlet pipe, 46-Flow channel, 5-Moving component, 51-Servo motor, 52-Forward and reverse threaded rod, 53-Slide rail, 6-Abutting unit, 61-L-shaped block, 62-Square frame, 63-Elastic component, 631-Parallel block, 632-Sliding bar, 633-Support column, 634-Abutting spring, 635-Wheel cover, 636-Abutting wheel, 64-Vertical rod, 65-Connecting frame, 66-Support plate, 67-Pneumatic component, 671-Control cylinder, 672-Piston rod, 673-Push plate, 674-Connecting rod, 68-Concave block. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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] Please see Figures 1-11 This invention provides two technical solutions: Example 1: A pressure testing device for PE pipe manufacturing, comprising a testing chamber 1, a liquid infusion component 2 on the outside of the testing chamber 1 for controlling the liquid flow during pipe pressure testing, and a sealing and positioning mechanism inside the testing chamber 1 for fixing and sealing PE pipes of different specifications, and completing the pressure testing through the liquid infusion component 2. The sealing and positioning mechanism includes: Positioning part 3 limits the position of the PE pipe to be tested after it is placed, and causes the position of sealing part 4 to be adjusted synchronously. The sealing part 4 includes a symmetrical sealing cover 41, and the sealing cover 41 is adjusted vertically by the abutment unit 6 installed on the positioning part 3. The inner side of the sealing cover 41 is provided with docking grooves 42 of different diameters, and sealing rings 43 of corresponding sizes are installed at the docking grooves 42 respectively. The surface of the symmetrical sealing cover 41 is fixedly connected to the inlet pipe 44 and the outlet pipe 45, and both the inlet pipe 44 and the outlet pipe 45 are connected to the liquid delivery component 2. The sealing cover 41 is provided with a liquid flow channel 46 inside, and the outlet end of the liquid flow channel 46 is located at the center of the circular inner wall of the sealing cover 41. The movable part 5 enables the overall movement of the positioning part 3 and the sealing part 4, and assists in the placement of the PE pipe to be tested according to its length.

[0023] The testing box 1 is a box structure with a maintenance door on the front and an observation window on the door to facilitate the observation of the pressure test. A drain outlet is opened at the bottom of the box to facilitate the discharge of residual water after the test. The diameter of the mating groove 42 in the sealing cover 41 decreases step by step from the outside to the inside. Each mating groove 42 has an individual ring sealing ring 43 embedded at the bottom. The sealing ring 43 is made of water pressure resistant rubber. After bearing pressure, it undergoes a slight deformation to fill the gap at the end of the pipe. The liquid flow channel 46 runs directly from the liquid inlet pipe 44 to the center of the sealing cover 41. The water outlet is directly opposite the inner hole of the pipe, completely avoiding the problem of the pipe end face blocking the water passage.

[0024] By setting the moving part 5, the servo motor 51 drives the positive and negative threaded rods 52 to rotate, which drives the moving block 33 mounted on the slide rail 53 to slide in opposite directions or in opposite directions. The installation distance between the two sets of positioning parts 3 can be freely adjusted, which can adapt to PE pipes of different lengths and specifications, solve the industry pain point of cumbersome clamping and positioning of pipes of different lengths. At the same time, in conjunction with the lower clamping block 32 inside the positioning part 3 and the upper clamping block 384 of the clamping part 38, the vertical clamping and limiting of the pipe is realized, and the reliable clamping of the pipe is completed from both length and radial dimensions, which greatly simplifies the pipe loading, unloading and positioning process.

[0025] Please see Figures 1-2In this embodiment of the invention, the infusion device 2 includes a water tank 21 and an infusion booster pump 22, and the infusion booster pump 22 is connected to the water tank 21. The output pipe of the infusion booster pump 22 is connected to the control valve 23. A pressure gauge is installed on the control valve 23 to monitor the pressure. The port of the control valve 23 is fixedly connected to the inlet pipe 44 and the outlet pipe 45.

[0026] Among them, the control valve 23 integrates a pressure relief valve, a pressure regulating valve, and a shut-off valve into a three-way valve body. It is equipped with a pressure gauge to display the pipeline water pressure in real time. The test pressure rise, pressure holding, and pressure relief are independently controlled in stages. The infusion booster pump 22 is a variable frequency booster pump that can steplessly adjust the outlet water pressure to meet the requirements of low-pressure leak detection and high-pressure burst multi-stage pressure resistance test.

[0027] By creating multi-sized butt joint grooves 42 on the inner side of the sealing cover 41, each butt joint groove 42 is fitted with a sealing ring 43 matching the pipe diameter. Combined with the pneumatic components 67 on the side of the support plate 66, the control cylinder 671 pushes the sealing cover 41 horizontally against both ends of the pipe via the piston rod 672, push plate 673, and multiple sets of circumferentially arranged connecting rods 674. Pipes of different diameters can be correspondingly embedded into the butt joint grooves 42. End sealing is achieved by continuous pressure stabilization and locking by the cylinder. This, combined with the water tank 21 of the infusion unit 2 and the infusion booster... The pump 22 and control valve 23 allow high-pressure water to flow into the inner cavity of the pipe through the inlet pipe 44 and the internal flow channel 46 of the sealing cover 41. Finally, the water flows back from the outlet pipe 45 to form a closed water pressure circuit, realizing integrated testing of pipe clamping and positioning, end sealing, and water pressure resistance. It eliminates the need to disassemble the equipment and complete the clamping and water pressure test step by step, resulting in a high degree of integration. With the graded pressure regulating control valve 23, the test water pressure can be adjusted in stages, accurately collecting data on the pressure resistance, leakage, and damage of PE pipes under different pressures, thus improving the accuracy of product pressure resistance testing.

[0028] Please see Figures 4-6 In this embodiment of the invention, the positioning part 3 includes: The lower base 31 has a lower clamping block 32 installed at the middle of its top, and a moving block 33 installed at the bottom of the lower base 31. The upper cover 34 has a support rod 36 rotatably connected to one end via a rotating rod 35. The bottom end of the support rod 36 is fixed to the arc-shaped end face of the top of the lower base 31. The other end of the upper cover 34 has a slot 37, while a limit plate 310 is fixedly installed on the arc-shaped end face of the top of the lower base 31. When the slot 37 and the limit plate 310 are engaged, the upper cover 34 and the lower base 31 are parallel and form a closed area. The upper cover 34 is provided with a clamping member 38, which cooperates with the lower clamping block 32 to clamp the PE pipe to be tested. Furthermore, after the upper cover 34 is rotated to be parallel with the lower base 31, the upper cover 34 and the lower base 31 are fixed by the set buckle 39.

[0029] The top surface of the lower base 31 is divided into two arc-shaped surfaces. One arc-shaped surface is used to fix the support rod 36, and the other arc-shaped surface is a guide surface, which is dedicated to the contact of the abutting wheel 636. The limiting plate 310 is a raised vertical plate structure. When the upper cover 34 is closed, the slot 37 is directly locked on the outside of the limiting plate 310 to achieve radial limiting of the upper cover 34 and prevent it from moving left and right.

[0030] By installing the abutment unit 6 on the side wall of the lower moving block 383 of the positioning part 3, when the rotating handle 382 and the drive threaded column 381 of the rotating clamping part 38 drive the lower moving block 383 to press down and clamp the pipe, the lower moving block 383, together with the L-shaped block 61 and the square frame 62, moves down synchronously. The abutment wheel 636 rolls along the arc-shaped end face of the lower base 31. Relying on the elastic compensation effect of the abutment spring 634, the vertical rod 64 is driven to rise and fall. The vertical height of the sealing cover 41 of the sealing part 4 is adjusted synchronously through the connecting frame 65 and the support plate 66. It can automatically correct the axis of the sealing cover 41 and the axis of the pipe according to the outer diameter of PE pipes of different diameters, ensuring that the sealing cover 41 and the pipe to be tested are accurately coaxial, thus avoiding defects caused by coaxiality deviation, such as the sealing ring 43 not sealing properly and the flow channel 46 being blocked by the end face of the pipe.

[0031] Please see Figure 5 In this embodiment of the invention, the clamping member 38 includes a threaded post 381. A rotating handle 382 is fixedly installed at the top of the threaded post 381. The threaded post 381 passes through the upper cover 34 and is threadedly connected to the upper cover 34. A lower moving block 383 is rotatably installed at the bottom of the threaded post 381. The lower moving block 383 is slidably connected to the protrusion on the inner side of the upper cover 34. An upper clamping block 384 is installed at the bottom of the lower moving block 383. The upper clamping block 384 and the lower clamping block 32 are vertically opposite each other. When the threaded post 381 rotates, the lower moving block 383 moves to a vertical position.

[0032] Please see Figures 5-6 In this embodiment of the invention, the buckle 39 includes a hook 391. One end of the hook 391 is rotatably mounted on the side wall of the upper cover 34 via a fixing bolt 392, while a locking block 393 is installed on the side of the lower base 31. After the hook 391 rotates around the fixing bolt 392, it engages with the lower side of the locking block 393.

[0033] The hook 391 has an L-shaped bent structure, the fixing bolt 392 uses a bolt assembly to achieve hinge, the locking block 393 has a locking groove, and the hook 391 is locked into the lower edge of the locking block 393 to achieve mechanical locking.

[0034] Please see Figures 7-11 In this embodiment of the invention, the abutment unit 6 includes: An L-shaped block 61 is installed on the side of the lowering block 383, and a square frame 62 is installed at the extended end of the L-shaped block 61. An elastic element 63 is provided inside the square frame 62 so that the vertical rod 64 can move in the vertical direction. The connecting frame 65 is fixedly installed on the surface of the vertical rod 64 and moves vertically as the vertical rod 64 moves. A support plate 66 is installed at the end of the connecting frame 65, and the sealing cover 41 is moved horizontally by a pneumatic component 67 at the support plate 66. A concave block 68 is fixedly installed on the side of the sealing cover 41, and the concave opening of the concave block 68 slides in contact with the connecting frame 65.

[0035] Please see Figures 9-10 In this embodiment of the invention, the elastic element 63 includes: Parallel block 631 is located inside square frame 62 and fixedly installed at the top of vertical rod 64. Sliding strip 632 is installed on the inner wall of square frame 62. Parallel block 631 passes through sliding strip 632 and slides relative to sliding strip 632. Support column 633 is installed at the top of parallel block 631. A stop spring 634 is sleeved on support column 633. The two ends of stop spring 634 are fixed to the opposite sides of parallel block 631 and square frame 62. The restoring force of stop spring 634 when not affected by other external forces causes parallel block 631 to move downward. The wheel cover 635 is fixedly installed at the bottom of the vertical rod 64, and the abutment wheel 636 is rotatably installed inside the wheel cover 635 through a rotating pin. After the lowering block 383 moves down, the abutment wheel 636 contacts the arc-shaped end face on the other side of the top of the lower base 31.

[0036] The vertical rod 64 moves according to the size of the PE pipe to be tested. When the abutment wheel 636 contacts the arc-shaped end face of the lower base 31, the upper node of the largest-sized mating groove 42 inside the sealing cover 41 is flush with the arc-shaped upper node of the contact surface of the upper clamping block 384. As the size of the PE pipe to be tested decreases, the upper clamping block 384 continues to move downward while the sealing cover 41 moves upward until the upper clamping block 384 and the lower clamping block 32 cooperate to clamp the PE pipe to be tested. At this time, the center of the sealing cover 41 is kept in correspondence with the center of the PE pipe to be tested.

[0037] Please see Figure 11 In this embodiment of the invention, the pneumatic component 67 includes a control cylinder 671 fixedly installed at the center of the side of the support plate 66. A piston rod 672 is slidably installed inside the control cylinder 671, and the end of the piston rod 672 extends through to one side of the support plate 66 and is fitted with a push plate 673. A connecting rod 674 is circumferentially and equidistantly installed on the side of the push plate 673 relative to the side of the sealing cover 41 to fix the push plate 673 and the sealing cover 41.

[0038] The control cylinder 671 is connected to the external air circuit and continues to apply force to maintain the seal after the sealing cover 41 comes into contact with the PE pipe to be tested. The control cylinder 671 is equipped with a pressure-stabilizing solenoid valve, which continuously supplies air during the pressure holding stage to maintain the pressure of the sealing cover 41 on the pipe end. During the water pressure increase process, the seal will not come off and leak water.

[0039] Please see Figure 3 In this embodiment of the invention, the moving part 5 includes a servo motor 51 fixedly installed on the inner wall of the detection box 1. One end of the output shaft of the servo motor 51 is equipped with a positive and negative threaded rod 52 through a coupling, and the extension end of the positive and negative threaded rod 52 is fixed to the inner wall of the detection box 1. The positive and negative threads of the positive and negative threaded rod 52 pass through and are threadedly connected to the moving block 33. A slide rail 53 is installed at the bottom of the inner cavity of the detection box 1, and the moving block 33 slides horizontally on the slide rail 53.

[0040] The two moving blocks 33 on both sides are respectively engaged with the positive and negative thread sections of the positive and negative threaded rods 52. When the servo motor 51 rotates forward, the two sets of moving blocks 33 move towards each other and shorten the distance to adapt to short pipes. When rotating in reverse, they move away from each other and lengthen the distance to adapt to long pipes.

[0041] The servo motor 51 is a three-phase asynchronous motor. The servo motor 51 is electrically connected to an external power supply and has an outer casing for protection. The servo motor 51 has a self-locking function, which limits the position of the moving block 33 after the machine stops. The servo motor 51 is connected to an external speed controller, which can finely adjust the rotation speed of the lead screw, realizing two-level adjustment of the spacing of the positioning part 3: coarse adjustment and fine adjustment.

[0042] Example 2 differs from Example 1 in that: the present invention also discloses a pressure resistance testing method for PE pipe manufacturing, specifically including the following steps: S1. Based on the length of the PE pipe to be tested, the moving part 5 is used to determine the rough range, and then the PE pipe to be tested is placed on the positioning part 3 for limiting and fixing. S2, the PE pipe limiting and fixing synchronization enables the abutment unit 6 to achieve the symmetrical sealing cover 41 corresponding to the center line of the pipe, and the operation makes the sealing cover 41 seal both ends of the PE pipe to be tested. S3. Finally, the liquid is transferred through the infusion fitting 2, and a closed flow loop is formed through the inlet pipe 44, the flow channel 46, the PE pipe to be tested and the outlet pipe 45. Different pressures are switched to complete the pressure resistance test of the PE pipe to be tested.

[0043] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0044] During operation, the various components inside the testing box 1 work together to complete the entire process of PE pipe clamping and positioning, end sealing, and water pressure resistance testing. The specific action process is as follows: First, based on the actual length of the PE pipe to be tested, start the servo motor 51 inside the moving part 5. The servo motor 51 drives the positive and negative threaded rods 52 to rotate, which drives the two moving blocks 33 to slide horizontally in opposite directions along the slide rail 53 to complete the coarse adjustment of the distance between the two sets of positioning parts 3 to adapt to the pipe length. After the distance adjustment is completed, stop the servo motor 51 and rely on the motor self-locking to lock the position of the moving block 33. Then, the upper cover 34 of the positioning part 3 is opened. The upper cover 34 rotates upward around the support rod 36 with the rotating rod 35 as the fulcrum. The PE pipe to be tested is placed on the lower clamping block 32 at the top of the lower base 31. The upper cover 34 is lowered back, so that the end slot 37 of the upper cover 34 engages with the limiting plate 310. Then, the hook 391 of the buckle 39 is rotated. The hook 391 rotates around the fixing bolt 392 as the center and engages with the lower end of the side clamping block 393 of the lower base 31, so that the upper cover 34 and the lower base 31 are initially locked. The rotating handle 382 of the clamping member 38 is turned, which drives the threaded column 381 to rotate synchronously. Under the action of the threaded transmission, the lower moving block 383 slides vertically downward along the inner guide structure of the upper cover 34, driving the upper clamping block 384 to press down. It cooperates with the lower clamping block 32 below to clamp and fix the PE pipe from the upper and lower sides, thus completing the radial limit of the pipe. During the downward movement of the lowering block 383, the L-shaped block 61 and the square frame 62 of the abutment unit 6 are moved downward as a whole. The square frame 62 presses down on the elastic element 63, and the abutment wheel 636 contacts the arc-shaped end face of the lower base 31. The vertical rod 64 links the connecting frame 65 and the support plate 66 to be aligned synchronously. After the upper clamping block 384 and the lower clamping block 32 cooperate to clamp the PE pipe to be tested, the center of the sealing cover 41 is kept to correspond with the center of the PE pipe to be tested. The pneumatic component 67 at the support plate 66 is precisely aligned with the sealing cover 41 of the sealing part 4 and the axis of both ends of the PE pipe. The concave block 68 and the connecting frame 65 maintain a sliding limit cooperation. When the external air circuit is connected, the control cylinder 671 of the pneumatic component 67 is activated. The piston rod 672 extends outward to push the push plate 673, which is then pushed by multiple circumferentially arranged connecting rods 674 to bring the sealing covers 41 horizontally closer to the pipe ends. The sealing covers 41 are pressed tightly against the pipe ends by the mating groove 42 on the inner side that matches the outer diameter of the pipe and the sealing ring 43. The pipe ends are sealed by the continuous pressure maintained by the cylinder. The liquid flow channel 46 inside the sealing cover 41 is aligned with the center of the inner hole of the pipe. After the sealing process is completed, the infusion unit 2 is activated. The water inside the water tank 21 is pressurized and delivered to the control valve 23 by the infusion booster pump 22. The control valve 23 regulates the water pressure and flow in the pipeline. The high-pressure water enters the inner cavity of the PE pipe through the inlet pipe 44 into the flow channel 46 inside the sealing cover 41, and then flows back from the other end of the pipe through the corresponding flow channel 46 and outlet pipe 45 to form a closed water circulation loop. The water supply pressure is adjusted in stages by the control valve 23, and the pipeline pressure is monitored in real time with the help of a pressure gauge. The deformation, leakage, and rupture of the PE pipe are observed under different set water pressure conditions, thereby completing the pressure resistance test of the PE pipe. After a single test is completed, the water inside the pipe is first drained by the control valve 23. The control cylinder 671 pulls the sealing cover 41 away from both ends of the pipe. The buckle 39 is released, the handle 382 is rotated in the opposite direction to lift the upper clamp 384, and the upper cover 34 is lifted to remove the tested PE pipe. After the equipment is reset, the pressure test of the next set of pipes can be carried out.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure testing device for PE pipe manufacturing, comprising a testing box (1), wherein a liquid infusion device (2) is provided on the outside of the testing box (1) to realize liquid flow control for pipe pressure testing, characterized in that: The testing chamber (1) is equipped with a sealing and positioning mechanism to accommodate PE pipes of different specifications for fixed sealing, and completes the pressure test by combining with the infusion fitting (2). The sealing and positioning mechanism includes: The positioning part (3) limits the position of the PE pipe to be tested after it is placed, and makes the position of the sealing part (4) move synchronously. The sealing part (4) includes a symmetrical sealing cover (41), and the sealing cover (41) is adjusted vertically by the abutment unit (6) installed on the positioning part (3). The inner side of the sealing cover (41) is provided with docking grooves (42) of different diameters, and sealing rings (43) of corresponding sizes are installed at the docking grooves (42). The surface of the symmetrical sealing cover (41) is fixedly connected to the inlet pipe (44) and the outlet pipe (45), and the inlet pipe (44) and the outlet pipe (45) are both connected to the infusion component (2). The sealing cover (41) is provided with a flow channel (46), and the outlet end of the flow channel (46) is located at the center of the circular inner wall of the sealing cover (41). The moving part (5) enables the overall movement of the positioning part (3) and the sealing part (4) to adapt to the length of the PE pipe to be tested and assist in placement.

2. The compression detection device for PE pipe manufacturing based on the device according to claim 1, characterized in that: The infusion unit (2) includes a water tank (21) and an infusion booster pump (22), and the infusion booster pump (22) is connected to the water tank (21), while the output pipe of the infusion booster pump (22) is connected to the control valve (23). A pressure gauge is installed on the control valve (23) to monitor the pressure. The port of the control valve (23) is fixedly connected to the inlet pipe (44) and the outlet pipe (45).

3. The compression testing device for PE pipe manufacturing based on the device according to claim 1, characterized in that: The positioning part (3) includes: The lower base (31) has a lower clamping block (32) installed at the middle of the top, and a moving block (33) installed at the bottom of the lower base (31). The upper cover (34) has a support rod (36) rotatably connected at one end via a rotating rod (35). The bottom end of the support rod (36) is fixed to the arc-shaped end face of the top of the lower base (31). The other end of the upper cover (34) has a slot (37), while the other side of the arc-shaped end face of the top of the lower base (31) is fixedly installed with a limiting plate (310). When the slot (37) and the limiting plate (310) are engaged, the upper cover (34) and the lower base (31) are parallel and form a closed area. The upper cover (34) is provided with a clamping piece (38) which works with the lower clamping block (32) to clamp the PE pipe to be tested. Furthermore, after the upper cover (34) is rotated to be parallel with the lower base (31), the upper cover (34) and the lower base (31) are fixed by the set buckle (39).

4. The compression testing device for PE pipe manufacturing based on the device according to claim 3, characterized in that: The clamping member (38) includes a threaded post (381), a rotating handle (382) is fixedly installed at the top of the threaded post (381), the threaded post (381) passes through the upper cover (34) and is threadedly connected to the upper cover (34), and a lower moving block (383) is rotatably installed at the bottom of the threaded post (381). The lower moving block (383) is slidably connected to the protrusion on the inner side of the upper cover (34), and an upper clamping block (384) is installed at the bottom of the lower moving block (383). The upper clamping block (384) and the lower clamping block (32) are directly opposite each other in the vertical direction. When the threaded post (381) rotates, the lower moving block (383) moves in the vertical position.

5. The compression testing device for PE pipe manufacturing based on the claim 3, characterized in that: The fastener (39) includes a hook (391), one end of which is rotatably mounted on the side wall of the upper cover (34) via a fixing bolt (392), while a locking block (393) is installed on the side of the lower base (31). After the hook (391) rotates around the fixing bolt (392) as the center, it engages with the lower side of the locking block (393).

6. The compression testing device for PE pipe manufacturing based on the device according to claim 1, characterized in that: The abutment unit (6) includes: An L-shaped block (61) is installed on the side of the lowering block (383), and a square frame (62) is installed at the extended end of the L-shaped block (61). An elastic element (63) is provided inside the square frame (62) so that the vertical rod (64) can move in the vertical direction. The connecting frame (65) is fixedly installed on the surface of the vertical rod (64) and moves vertically with the movement of the vertical rod (64). A support plate (66) is installed at the end of the connecting frame (65), and the sealing cover (41) is moved horizontally by a pneumatic component (67) at the support plate (66). A concave block (68) is fixedly installed on the side of the sealing cover (41), and the concave opening of the concave block (68) slides in contact with the connecting frame (65).

7. The compression testing device for PE pipe manufacturing based on the device according to claim 6, characterized in that: The elastic element (63) includes: A parallel block (631) is located inside a square frame (62) and fixedly installed at the top of a vertical rod (64). A sliding strip (632) is installed on the inner wall of the square frame (62). The parallel block (631) passes through the sliding strip (632) and slides relative to the sliding strip (632). A support column (633) is installed at the top of the parallel block (631). A stop spring (634) is sleeved on the support column (633). The two ends of the stop spring (634) are fixed to the opposite sides of the parallel block (631) and the square frame (62). The restoring force of the stop spring (634) when it is not affected by other external forces causes the parallel block (631) to move downward. The wheel cover (635) is fixedly installed at the bottom of the vertical rod (64), and the wheel cover (635) is rotatably installed with a stop wheel (636) through a rotating pin. After the lower block (383) moves down, the stop wheel (636) contacts the arc-shaped end face on the other side of the top of the lower base (31).

8. The compression testing device for PE pipe manufacturing based on the device according to claim 6, characterized in that: The pneumatic component (67) includes a control cylinder (671) fixedly installed at the center of the side of the support plate (66). A piston rod (672) is slidably installed inside the control cylinder (671), and the end of the piston rod (672) extends through to one side of the support plate (66) and is fitted with a push plate (673). A connecting rod (674) is circumferentially and equidistantly installed on the side of the push plate (673) relative to the side of the sealing cover (41) to fix the push plate (673) and the sealing cover (41).

9. The compression testing device for PE pipe manufacturing based on the device according to claim 8, characterized in that: The moving part (5) includes a servo motor (51) fixedly installed on the inner wall of the test box (1). One end of the output shaft of the servo motor (51) is equipped with a positive and negative threaded rod (52) through a coupling. The extension end of the positive and negative threaded rod (52) is fixed to the inner wall of the test box (1). The positive and negative threads of the positive and negative threaded rod (52) are connected to the moving block (33) through and threaded. A slide rail (53) is installed at the bottom of the inner cavity of the test box (1). The moving block (33) slides horizontally on the slide rail (53).

10. A method for detecting the pressure resistance of PE pipe manufacturing based on the device as claimed in any one of claims 1 to 9, characterized in that: Specifically, the following steps are included: S1. Based on the length of the PE pipe to be tested, the moving part (5) is used to determine the rough range, and then the PE pipe to be tested is placed on the positioning part (3) for limiting and fixing. S2, the PE pipe limiting and fixing synchronously enables the abutment unit (6) to realize the symmetrical sealing cover (41) corresponding to the center line of the pipe, and operates to seal the two ends of the PE pipe to be tested. S3. Finally, the liquid is transferred through the infusion fitting (2), and a flow closed loop is formed through the inlet pipe (44), the flow channel (46), the PE pipe to be tested and the outlet pipe (45), and different pressures are switched to complete the pressure resistance test of the PE pipe to be tested.

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