Device for detecting creep resistance of PPR pipe fitting

Abstract

The invention discloses a device for detecting creep resistance of a PPR pipe fitting. The device comprises a base, a driving assembly and a torque loading assembly. The driving assembly drives the driving disc to rotate through a worm transmission structure, and an arc guide groove formed in the surface of the driving disc is used for guiding two movable sliding blocks in the torque loading assembly to generate relative axial movement. The torque loading assembly comprises a sliding sleeve seat, two oppositely arranged movable sliding blocks and a clamping sleeve piece, taper sleeve holes are formed in the two ends of the movable sliding blocks respectively, the clamping sleeve piece comprises an elastic ring and a plurality of clamping petals, and taper step heads matched with the taper sleeve holes are arranged at the two ends of the clamping petals; the clamping sleeve piece can generate radial clamping through the wedge-caulking effect in the moving process of the movable sliding block in any direction. Through the structure, the creep resistance of the PPR pipe fitting under a continuous load condition can be stably detected, and the creep resistance test device has the advantages of flexible loading mode, reliable clamping and high accuracy of test results.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting testing equipment, specifically a device for testing the creep resistance of PPR pipe fittings. Background Technology

[0002] PPR pipe fittings are widely used in building water supply and drainage and related fluid transport systems due to their good corrosion resistance, light weight, and easy installation. However, during long-term use, PPR pipe fittings are typically subjected to continuous internal pressure, installation stress, or external constraints, making them prone to creep deformation. This can lead to problems such as pipe deformation, loose connections, and even leakage. Therefore, testing the creep resistance of PPR pipe fittings under continuous load conditions is a crucial step in ensuring their long-term reliability.

[0003] Existing PPR pipe creep resistance testing devices mostly employ unidirectional axial loading or internal pressure loading. Their pressure drive structure typically includes a hydraulic cylinder, electric actuator, or screw mechanism, which applies axial tensile or pushing loads to the pipe fitting. This type of structure can usually only achieve tension or compression in one direction. If both tension and pushing test conditions need to be performed in the same device, it is often necessary to change the loading mechanism or adjust the clamping structure, resulting in complex equipment structure, cumbersome operation, and low testing efficiency.

[0004] Regarding clamping structures, common solutions in existing technologies include rigid claw clamping, threaded locking clamping, or unidirectional wedge clamping. These clamping methods generally suffer from the following problems during loading: Firstly, there is a lack of effective adaptive relationship between the clamping force and the loading force. When the loading force increases, the clamping structure is prone to axial slippage due to insufficient clamping, affecting the true transfer of load. Secondly, artificially increasing the initial clamping force to prevent slippage can easily cause localized pressure damage or stress concentration on the surface of the PPR pipe fitting, thus affecting the accuracy of the creep test results.

[0005] Furthermore, in existing creep resistance testing devices, the loading drive structure mostly adopts ordinary gear transmission, direct motor drive, or hydraulic drive. These types of drive methods usually cannot automatically maintain the loaded position after the drive stops, requiring additional brakes or locking mechanisms to maintain the axial load. This not only increases the structural complexity of the device but also introduces potential risks of load decay or instability during long-term testing, making it difficult to stably simulate the continuous load state that pipe fittings experience under actual working conditions.

[0006] Meanwhile, some existing testing devices adopt unilateral loading or asymmetrical clamping in their structural design, which makes the pipe fittings prone to off-center loading during the testing process. This results in test results being greatly affected by clamping errors and structural deformation, with insufficient repeatability and reliability, making it difficult to meet the requirements for accurate evaluation of the creep resistance of PPR pipe fittings.

[0007] In summary, existing creep resistance testing technologies for PPR pipe fittings still have shortcomings in terms of the diversity of loading methods, clamping stability, ability to maintain continuous load, and the authenticity and repeatability of test results. There is an urgent need for a new type of testing device with a reasonable structure, flexible loading methods, reliable clamping, and the ability to maintain load stably in a constant temperature environment to overcome the above-mentioned deficiencies. Summary of the Invention

[0008] The present invention aims to solve the problems of existing PPR pipe fitting creep resistance testing devices, such as single loading method, insufficient clamping stability, difficulty in maintaining continuous load, and poor authenticity and repeatability of test results. The present invention provides a PPR pipe fitting creep resistance testing device.

[0009] This device, through the overall design of the loading drive structure, clamping structure and motion conversion method, enables the application of a maintainable axial tensile load or pushing load to PPR pipe fittings in a constant temperature environment, and automatically forms a stable clamp during the loading process, thereby more realistically reflecting the creep deformation of the pipe fittings under long-term stress conditions.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a device for testing the creep resistance of PPR pipe fittings, comprising a base, a drive assembly, and a torque loading assembly. The drive assembly drives a driving disc to rotate via a worm gear transmission structure. An arc-shaped guide groove on the surface of the driving disc converts the rotational motion into relative axial motion between two movable sliders in the torque loading assembly. A clamping device in the torque loading assembly, during the movement of the movable sliders, forms a radial clamp on the pipe fitting under test through a conical wedge action, and simultaneously applies axial tensile or pushing loads, thereby completing the creep resistance test of the PPR pipe fittings under constant temperature conditions. The torque loading assembly includes two movable sliders arranged opposite each other along the same axis. The two movable sliders are slidably fitted into the arc-shaped guide groove on the surface of the driving disc via sliding pins, allowing the driving disc to drive the two movable sliders to produce relative axial displacements of moving away or relatively close together when rotating.

[0011] Specifically, by symmetrically guiding the moving slider through the arc guide groove, the rotational drive is converted into axial relative displacement. Under the same structural system, the tensile loading or pushing loading of the pipe under test can be realized. The structure is compact, the motion relationship is clear, and it is suitable for the stable and controllable loading conditions required for creep resistance testing.

[0012] In a preferred embodiment, the configuration is further as follows: each movable slider has tapered sleeve holes at both ends, the clamping assembly is centrally arranged along the axial direction of the movable slider, the tapered steps at both ends of the clamping assembly correspond to the tapered sleeve holes at both ends of the movable slider, and the clamping assembly has tapered steps at both ends that match the tapered sleeve holes, so that when the clamping assembly moves in any direction of the movable slider, it can generate radial clamping through the wedge-tight fit between the tapered sleeve holes and the tapered steps.

[0013] Specifically, the bidirectional wedge structure ensures that the clamping assembly maintains its clamping capability throughout the bidirectional movement of the sliding block, thus enabling traction or pushing loading without switching clamping structures and improving the applicability and stability of the device under different testing conditions.

[0014] In a preferred embodiment, the clamping assembly is further configured such that: the clamping assembly includes an elastic ring and a plurality of clamping segments evenly distributed along the circumference of the elastic ring, a radial gap is formed between each clamping segment, and the two ends of the clamping segments are integrally formed into a tapered step head, which generates radially inward elastic contraction under the wedge action of the tapered sleeve hole.

[0015] Specifically, the elastic ring and multi-clamp structure enable the clamping process to have a certain degree of flexibility, and the clamping force can be automatically adjusted with the axial loading force. This effectively prevents the pipe under test from axially slipping during loading and avoids damage to the pipe surface caused by excessive clamping, thereby improving the authenticity and repeatability of creep test results.

[0016] In a preferred example, the drive assembly is further configured such that the drive assembly adopts a worm gear transmission structure in which the geared motor meshes with the worm shaft and worm wheel teeth to drive the drive disc to rotate, and utilizes the self-locking characteristic of the worm gear transmission itself to ensure that the drive disc can maintain its current position and not rotate after the drive stops.

[0017] Specifically, the worm gear self-locking structure can maintain the axial position of the moving slider without the need for an additional locking mechanism, so that the tensile or pushing force applied to the pipe under test remains stable during long-term testing, meeting the requirements of creep resistance testing for continuous load conditions.

[0018] In a preferred example, the configuration is further as follows: a sensing rail is installed inside the torque loading component, and a magnetic component is installed on the side of the moving slider. The axial displacement of the moving slider is detected in real time by a Hall sensor. At the same time, a constant temperature control system is installed inside the control box to maintain the constant temperature of the test environment through an electric heating component and a circulating fan component.

[0019] Specifically, by monitoring the displacement of the moving slider in real time, deformation information of the pipe under test under continuous load can be indirectly obtained; combined with constant temperature environment control, the test conditions are made stable and consistent, further improving the accuracy and comparability of creep resistance test results.

[0020] The beneficial effects achieved by this invention are as follows: 1. In this invention, by setting a movable slider that can slide bidirectionally along the axial direction and cooperating with the double-end wedge-tightening structure of the clamping kit, the movable slider can drive the clamping kit to form radial clamping of the pipe under test in any sliding direction. Thus, without switching the clamping mechanism, both axial pulling force and axial pushing force can be applied to the pipe under test, realizing automatic clamping and axial wedge-tightening of the pipe during the test, significantly improving the flexibility and stability of the loading method.

[0021] 2. In this invention, the rotation of the active disk is controlled, and the bidirectional arc guide groove on its surface is used to symmetrically guide the moving slider, so that the two moving sliders can generate axial displacements that are relatively far apart or relatively close together, thereby completing the tensile loading or pushing loading of the test pipe under the same structural system; at the same time, the active disk is driven by the meshing transmission of the worm gear shaft and the worm wheel teeth. The worm gear transmission structure itself has a self-locking characteristic, so that the axial tensile force or thrust generated during the loading process can remain unchanged after the drive stops, without the need for an additional locking device, thus ensuring the reliability of the continuous load conditions in the creep resistance test.

[0022] 3. In this invention, by setting the clamping kit as a radially retractable structure composed of an elastic ring and multiple clamping segments, and by automatically adjusting the clamping state of the clamping kit according to the change of axial load under bidirectional wedge clamping action, an adaptive matching relationship is formed between the clamping force and the loading force. This effectively avoids the problem of axial slippage of the pipe fitting caused by insufficient clamping during the test, and ensures that the applied load can be applied to the pipe fitting body under test in a real and complete manner, thereby improving the accuracy and repeatability of the creep resistance test results of PPR pipe fittings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the base surface structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a torque loading component structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the active disk and moving slider structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the moving slider and sensing rail structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the moving slider and clamping assembly structure according to an embodiment of the present invention; Figure 7 This is an exploded view of the clip kit according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the surface structure of the active disk according to an embodiment of the present invention.

[0024] Figure label: 100. Base; 110. Control box; 120. Constant temperature control system; 130. Test panel; 200. Drive assembly; 210. Drive disc; 211. Arc guide groove; 212. Worm gear; 220. Gear motor; 230. Worm gear shaft; 300. Torque loading assembly; 310. Sliding sleeve seat; 320. Moving slider; 321. Tapered sleeve hole; 322. Sliding pin; 330. Clamping assembly; 331. Elastic ring; 332. Clamping disc; 333. Tapered step head; 340. Sensing rail; 341. Magnetic component. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0026] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0027] The following describes, with reference to the accompanying drawings, some embodiments of a PPR pipe fitting creep resistance testing device provided by the present invention.

[0028] Combination Figures 1-8 As shown, the present invention provides a creep resistance testing device for PPR pipe fittings, comprising a base 100, a drive assembly 200, and a torque loading assembly 300.

[0029] The base 100 is used to support the entire structure. The control box 110 is fixedly installed on its top surface. The drive assembly 200 and the torque loading assembly 300 are both arranged on the top surface of the base 100 and located inside the control box 110, so that the test process is carried out in a controlled space.

[0030] The drive assembly 200 provides the loading driving force and includes a drive disk 210, a geared motor 220, and a worm gear shaft 230 fixed to the output end of the drive disk 210. The geared motor 220 is fixedly mounted on the surface of the base 100, and its output end is connected to the worm gear shaft 230. The worm gear shaft 230 meshes with the worm gear teeth 212 provided on the outer periphery of the drive disk 210, thereby driving the drive disk 210 to rotate slowly around its axis, achieving stable and controllable loading motion.

[0031] The active disk 210 is rotatably mounted on the surface of the base 100. Two arc guide grooves 211 are formed on the surface of the active disk 210 and are symmetrically arranged about the origin of the center of the active disk 210. These grooves are used to convert the rotational motion of the active disk 210 into the relative displacement of the subsequent moving slider.

[0032] like Figures 3 to 5As shown, the torque loading assembly 300 includes a sliding sleeve 310, two movable sliders 320 and a clamping assembly 330, and a sensing rail 340 is provided inside the sliding sleeve 310.

[0033] The sliding sleeve seat 310 is fixedly installed on the top surface of the base 100, and its interior forms a cavity structure for accommodating and guiding the movable slider 320, so that the movable slider 320 can only slide in the axial direction.

[0034] Two movable sliders 320 are arranged opposite each other along the same axis and are slidably mounted on the inner side of the sliding sleeve seat 310. A sliding pin 322 is fixedly mounted on the bottom surface of each movable slider 320, and the sliding pin 322 is slidably sleeved on the inner side of the arc guide groove 211 on the surface of the driving disk 210. As the driving disk 210 rotates, the arc guide groove 211 guides the sliding pin 322, causing the two movable sliders 320 to move relatively closer or relatively farther apart in opposite directions along the axial direction.

[0035] The arc guide groove 211 is a two-section arc-shaped structure arranged in opposite directions. Its two ends are symmetrically arranged about the origin about the center of the active disk 210. The two ends of the arc guide groove 211 are close to the axis of the sliding sleeve seat 310 and the outer periphery of the active disk 210, respectively, so as to ensure that the moving slider 320 achieves symmetrical and stable relative motion during the rotation of the active disk 210.

[0036] like Figure 6 and Figure 7 As shown, each movable slider 320 has a tapered sleeve hole 321 at both ends, and the two tapered sleeve holes 321 are arranged opposite each other and symmetrically distributed along the axis of the movable slider 320.

[0037] The clamping assembly 330 is movably sleeved on the inner side of the corresponding movable slider 320 and is centrally arranged along the axial direction of the movable slider 320. The clamping assembly 330 includes an elastic ring 331 and multiple clamping segments 332 fixed to the outer periphery of the elastic ring 331. Each clamping segment 332 is evenly distributed circumferentially, and a radial gap is provided between adjacent clamping segments 332, so that the clamping assembly 330 as a whole has radial elastic contraction capability.

[0038] Each clamping piece 332 has a conical stepped head 333 integrally formed at both axial ends. After the clamping piece 330 is assembled, its two conical stepped heads 333 are respectively inserted into and abut against the inner sides of the conical sleeve holes 321 at both ends of the movable slider 320. The taper of the inner side of the conical sleeve hole 321 is set to be greater than the taper of the conical stepped head 333, so that the two form a stable wedge-tight fit relationship.

[0039] When the movable slider 320 moves axially under the guidance of the arc guide groove 211, a wedge-tight compression is generated between the tapered sleeve hole 321 and the tapered step head 333, causing the clamping petal 332 to undergo radial inward elastic deformation, thereby forming a radial clamping on the PPR pipe fitting to be tested located inside the clamping kit 330.

[0040] Since both ends of the clamping assembly 330 form a tapered tight fit with the movable slider 320, the movable slider 320 can wedge the clamping assembly 330 during any axial movement, ensuring the stability of the clamping state during loading.

[0041] Two clamping sets 330 are arranged opposite each other along the same axis to clamp the two ends of the pipe to be tested, so that the pipe to be tested is always in a coaxial force state during the loading process, avoiding the influence of off-center load on the creep test results.

[0042] like Figure 5 As shown, the sensing rail 340 is fixedly mounted inside the sliding sleeve 310, and a Hall sensor is integrated inside it. A magnetic element 341 is provided on the side of the movable slider 320, and the magnetic element 341 slides and abuts against the surface of the sensing rail 340.

[0043] During the axial sliding process of the movable slider 320, the magnetic component 341 generates displacement changes on the surface of the sensing rail 340. The Hall sensor senses the magnetic field changes in real time and outputs the corresponding position signal, thereby realizing the accurate detection of the axial displacement of the movable slider 320 and providing a reliable basis for subsequent creep data analysis.

[0044] like Figure 1 As shown, a constant temperature control system 120 is installed inside the control box 110. The constant temperature control system 120 includes an electric heating component and a circulating fan component. By heating and circulating the air inside the control box 110, the pipe fitting under test is kept in a set constant temperature environment, meeting the temperature requirements for the creep resistance test of PPR pipe fittings. A temperature and humidity sensor is also installed inside the control box 110 for real-time monitoring of the test environment parameters.

[0045] The base 100 has a test panel 130 on its surface. The test panel 130 includes a control module for controlling the operating status of the drive assembly 200, a temperature control module electrically connected to the constant temperature control system 120, and an information display module electrically connected to the constant temperature control system 120 and the sensing rail 340 respectively, for displaying key parameters such as temperature and displacement during the test process.

[0046] Working principle and usage process of this invention: This invention uses a drive assembly to drive a double-moving slider to generate relative displacement, which, in conjunction with a clamping kit, applies a continuous and maintainable axial load to both ends of the PPR pipe fitting under test. The creep resistance of the pipe fitting is then tested in a constant temperature environment. Its specific working principle and usage process mainly include the following steps: Step 1: Marking treatment of the surface of the pipe fitting to be tested Before the test, the outer surface of the PPR pipe fitting to be tested is pretreated by uniformly marking a grid pattern on the axial and circumferential surfaces of the fitting. These grid patterns are used to visually compare the local deformation of the fitting under axial tensile or compressive loads after the test, helping to determine whether creep deformation, uneven local tensile stress, or material flow has occurred.

[0047] Step 2: Establishing a constant temperature environment The constant temperature control system 120 activates the electric heating and circulating fan components to preheat the internal space of the control box 110, gradually increasing the ambient temperature until it stabilizes at the preset constant temperature value. During the preheating and temperature stabilization process, temperature and humidity sensors installed inside the control box 110 monitor environmental parameters in real time, ensuring that the test is conducted under stable and controllable temperature conditions to meet the requirements for consistent ambient temperature in the creep resistance test of PPR pipe fittings.

[0048] Step 3: Installation of the pipe fitting to be tested Once the internal temperature of the control box 110 reaches the set value and remains stable, the PPR pipe fitting to be tested is threaded through and fitted between the clamping sleeves 330 inside the two moving sliders 320, so that both ends of the pipe fitting are located at the inner holes of the corresponding clamping sleeves 330. During installation, ensure that the axis of the pipe fitting to be tested remains coaxial with the movement axes of the two moving sliders 320 to ensure symmetrical force during subsequent loading and avoid affecting the test results due to uneven loading.

[0049] Step 4: Clamping Loading and Continuous Traction When the drive assembly 200 is started, the geared motor 220 drives the worm gear shaft 230 to rotate. The worm gear shaft 230 meshes with the worm gear teeth 212 on the outer periphery of the drive disc 210, causing the drive disc 210 to produce a slow and controllable deflection motion. During the rotation of the drive disc 210, the arc guide groove 211 provided on the surface of the drive disc 210 guides the sliding pin 322, causing the two moving sliders 320 to produce axial movements in opposite directions, moving away from each other or moving closer to each other.

[0050] When the two movable sliders 320 move away from each other, the tapered sleeve hole 321 on their inner side forms a wedge-tight fit with the tapered step head 333 at both ends of the clamping kit 330, causing the clamping kit 330 to contract radially, forming a stable clamp at both ends of the pipe to be tested, and simultaneously applying an axial traction load to the pipe to be tested; when the two movable sliders 320 move closer to each other, the clamping state can be released or weakened accordingly, for loading and unloading or load adjustment.

[0051] Because the meshing transmission between the worm shaft 230 and the worm gear 212 has a self-locking characteristic, after the drive component 200 stops outputting, the drive disc 210 can maintain its current angular position without rotating, thereby keeping the movable slider 320 in a predetermined position, realizing the continuous maintenance of the axial tension or thrust of the pipe under test without the need for an additional locking mechanism.

[0052] Under this continuous load condition, combined with a constant temperature environment, the creep deformation of the PPR pipe fitting under long-term stress can be effectively simulated and detected.

[0053] Step 5: Uninstallation and Result Determination After the preset test time is reached, the drive assembly 200 is stopped, the movable slider 320 returns to its original position and releases the clamping state, and the PPR pipe fitting to be tested is removed. By comparing the changes in the morphology of the grid-like marking lines on the surface of the pipe fitting before and after the test, it is observed whether the grid has undergone tensile deformation, twisting, or local uneven expansion, thereby determining the creep resistance performance of the PPR pipe fitting under continuous load and constant temperature conditions.

[0054] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Although embodiments of the invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A device for testing the creep resistance of PPR pipe fittings, characterized in that, It includes a base (100), a drive assembly (200) and a torque loading assembly (300). A control box (110) is fixedly installed on the top surface of the base (100). The drive assembly (200) and the torque loading assembly (300) are arranged on the top surface of the base (100) and located inside the control box (110). The drive assembly (200) includes a drive disk (210), a geared motor (220), and a worm gear shaft (230) fixed to the output end of the drive disk (210). The drive disk (210) is rotatably mounted on the surface of the base (100), and the outer periphery of the drive disk (210) is provided with worm gear teeth (212) that mesh with the surface of the worm gear shaft (230). The surface of the drive disk (210) has two arc guide grooves (211) arranged symmetrically about the center of the drive disk (210). The torque loading assembly (300) includes a sliding sleeve (310), a movable slider (320), and a clamping assembly (330), as well as a sensing rail (340) arranged inside the sliding sleeve (310). There are two movable sliders (320), both of which are slidably disposed inside the sliding sleeve (310) and slidably abut against one side of the sensing rail (340). The clamping assembly (330) is movably sleeved inside the corresponding movable slider (320). Both ends of the movable slider (320) are provided with tapered sleeve holes (321). The bottom surface of (320) is provided with a sliding pin (322) that is slidably sleeved on the inner side of the arc guide groove (211); the clamping assembly (330) includes an elastic ring (331) and a plurality of clamping segments (332) arranged on the outer periphery of the elastic ring (331). There is a gap between each clamping segment (332), and each clamping segment (332) has a tapered step head (333) at both ends. Through the wedge-tight abutment action between the tapered step head (333) and the inner side of the tapered sleeve hole (321), each clamping segment (332) undergoes radial deformation and shrinks inward, thereby clamping the test tube and applying a tensile load.

2. The PPR pipe fitting creep resistance testing device according to claim 1, characterized in that, The control box (110) is equipped with a constant temperature control system (120) inside. The constant temperature control system (120) includes an electric heating component and a circulating fan component. By heating and circulating the airflow inside the control box (110), the constant temperature control of the test environment is achieved. The control box (110) is also equipped with a temperature and humidity sensor.

3. The device for testing the creep resistance of PPR pipe fittings according to claim 1, characterized in that, The base (100) has a test panel (130) on its surface. The test panel (130) includes a control module for controlling the drive assembly (200), a temperature control module electrically connected to the constant temperature control system (120), and an information display module electrically connected to the constant temperature control system (120) and the sensing rail (340) respectively.

4. The creep resistance testing device for PPR pipe fittings according to claim 1, characterized in that, The sensing rail (340) has a built-in Hall sensor, and the side of the movable slider (320) is provided with a magnetic element (341) that slides against the surface of the sensing rail (340). The Hall sensor detects the position information of the movable slider (320) in real time by the displacement change of the magnetic element (341) on the surface of the sensing rail (340).

5. The creep resistance testing device for PPR pipe fittings according to claim 1, characterized in that, The arc guide groove (211) is a two-section arc-shaped structure arranged in opposite directions. The two ends of the arc guide groove (211) are arranged symmetrically about the center of the active disk (210), and the two ends of the arc guide groove (211) are close to the axial position of the sliding sleeve seat (310) and the outer periphery of the active disk (210), respectively.

6. The device for testing the creep resistance of PPR pipe fittings according to claim 1, characterized in that, The two ends of the clamping assembly (330) have tapered heads (333) that correspond to the tapered sleeve holes (321) at both ends of the movable slider (320), respectively. The inner taper of the tapered sleeve hole (321) is greater than the taper of the tapered head (333). The clamping assembly (330) is arranged centrally along the axial direction of the movable slider (320), so that the tapered heads (333) are inserted into the tapered sleeve holes (321) at both ends of the movable slider (320).

7. The device for testing the creep resistance of PPR pipe fittings according to claim 1, characterized in that, The elastic ring (331) is a flexible rubber component with an inner diameter larger than the outer diameter of the pipe to be tested. Multiple clips (332) are evenly distributed along the circumference and fix the surface of the elastic ring (331).

8. The device for testing the creep resistance of PPR pipe fittings according to claim 1, characterized in that, The two clamping kits (330) are arranged opposite each other along the same axis and are used to clamp the two ends of the surface of the pipe to be tested.

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