Anti-impact modified high-density polyethylene anti-leakage pipeline connecting device

Abstract

The invention provides an anti-impact modified high-density polyethylene anti-leakage pipeline connecting device, and relates to the technical field of pipeline connecting devices.The anti-impact modified high-density polyethylene anti-leakage pipeline connecting device comprises a connecting sleeve, the two side ends of the connecting sleeve are each provided with a positioning mechanism, and the positioning mechanisms are used for covering the ends of a polyethylene pipeline; according to the pipeline connecting sleeve, the end of the pipeline is prevented from being damaged due to collision and friction in the connecting process, meanwhile, the fitting precision of the sealing face and the outer wall of the pipeline is guaranteed, the pipeline is preliminarily guided by means of the matching relation between the clamping jaws and the groove bodies, and the coaxiality of the pipeline and the connecting sleeve is adjusted in real time; when the pipeline continues to be inserted into the second-stage positioning groove, the round-head clamping jaw is connected with the groove body in a clamped mode under the elastic effect of the metal elastic piece, at the moment, the second-stage positioning groove can effectively buffer the insertion impact force borne by the clamping jaw, the stress load of the metal elastic piece is dispersed, and the sealing effect of the pipeline is improved. And the elastic sheet is prevented from overload deformation and loss of elastic reset capability due to overexertion in one-time insertion.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe connection devices, and more specifically, relates to an impact-resistant modified high-density polyethylene anti-leakage pipe connection device. Background Technology

[0002] Impact-modified high-density polyethylene (HDPE) pipes, with their excellent impact resistance, corrosion resistance, and lightweight properties, have been widely used in municipal water supply and drainage, chemical media transportation, building rainwater drainage, and agricultural irrigation. In these engineering applications, the connection device, as the core node of the pipeline system, directly determines the operational reliability and service life of the entire pipeline system through its sealing performance, connection stability, and ease of operation. Defects in the connection device can lead not only to media leakage (such as water leakage in water supply and drainage pipes or corrosive media leakage in chemical pipelines), but also to pipe detachment, system shutdown, and even safety accidents and environmental pollution due to connection failure. Therefore, the technical rationality of the pipeline connection device is particularly crucial.

[0003] At least the following technical problems have been found in the current ethylene leak-proof pipeline connection devices: 1. Existing pipe connection devices often lack precise hierarchical positioning structures. The depth of pipe insertion into the connecting sleeve usually relies on the operator's experience or simple scale markings, making it difficult to achieve standardized control. On the one hand, if the insertion depth is too shallow, the outer wall of the pipe and the sealing surface of the connection device cannot be completely fitted, which can easily form a medium permeation channel at the sealing gap. On the other hand, if the insertion depth is too deep, the end of the pipe may squeeze the sealing component (such as the rubber sealing ring), causing the sealing component to deform, break, and lose its sealing function.

[0004] 2. Most existing connection devices use seals made of a single material, such as ordinary nitrile rubber or EPDM rubber seals. The sealing performance is significantly affected by environmental factors. Ordinary rubber has poor weather resistance and wear resistance. When exposed to outdoor ultraviolet radiation and temperature fluctuations for a long time, such as low-temperature embrittlement, high-temperature aging, or media erosion, it is prone to cracking and hardening, which leads to a decline in sealing performance.

[0005] 3. The locking mechanisms (such as bolts and clamps) of existing connection devices are mostly independent of the positioning process and lack linkage control logic. This can easily lead to erroneous operations such as locking before the pipe is fully inserted. Tightening the locking screw or clamp before confirming whether the pipe is inserted to the standard depth can result in a hidden gap between the pipe and the connecting sleeve. Furthermore, the locking force cannot be evenly transmitted to the sealing surface. During long-term use, the connection parts that are not fully inserted are prone to loosening due to pipe vibration and medium pressure fluctuations, which can lead to sealing failure or pipe detachment. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an impact-resistant modified high-density polyethylene (HDPE) anti-leakage pipe connection device. This device solves the problems of insufficient positioning accuracy, simple sealing structure with weak long-term protection, lack of anti-misoperation design, lack of protection at pipe ends leading to leakage weak points, and low practicality due to structural redundancy or inability to be reused.

[0007] A leak-proof pipe connection device for impact-resistant modified high-density polyethylene includes a connecting sleeve. Positioning mechanisms are provided at both ends of the connecting sleeve. These positioning mechanisms cover the ends of the polyethylene pipe to prevent damage during connection due to collision or friction, while ensuring the sealing surface's fit accuracy with the pipe's outer wall. An elastic mechanism is provided within the positioning mechanism to fix the positioning mechanism and the connecting sleeve. Through a matching engagement with the positioning groove, it provides segmented resistance feedback for pipe insertion and achieves axial limiting, preventing the pipe from detaching due to foundation settlement or vibration during use. A linkage mechanism is provided within the connecting sleeve to control the installation of the connecting sleeve and the positioning mechanism, achieving anti-misoperation functions such as preventing accidental locking when not in place and locking when in place, thus fundamentally avoiding connection failure caused by insufficient insertion depth.

[0008] Preferably, the connecting sleeve has a primary positioning groove, a secondary positioning groove, and a tertiary positioning groove inside. The linkage mechanism is located in the tertiary positioning groove of the connecting sleeve. The elastic mechanism slides and engages within the primary, secondary, and tertiary positioning grooves. The primary positioning groove guides and calibrates the coaxiality of the pipe during initial insertion, preventing pipe misalignment. The secondary positioning groove acts as a buffer to prevent the elastic mechanism from being damaged by excessive force at once. The tertiary positioning groove accurately locks the standard insertion depth. The three mechanisms work together to ensure stable and accurate positioning.

[0009] Preferably, the positioning mechanism includes a protective sleeve, which is fitted onto the polyethylene pipe. The inner wall of the end of the protective sleeve is in contact with the polyethylene pipe, enhancing the integrity of the pipe and the connecting device and reducing vibration transmission. The protective sleeve has a threaded hole to provide a threaded connection point for the locking screw, ensuring the stability of the fixing structure.

[0010] Preferably, the connecting sleeve has a shape memory rubber layer inside, and the circumferential surface of the shape memory rubber layer is woven with a nickel-titanium alloy wire mesh. The nickel-titanium alloy wire mesh provides rigid support for the shape memory rubber layer, allowing it to automatically correct to a perfect circle after slight twisting during installation. The circumferential surface of the nickel-titanium alloy wire mesh is covered with a water-swellable rubber layer, which expands in volume upon contact with water, filling the microscopic gaps in the sealing surface and enhancing the dynamic sealing effect. The water-swellable rubber layer is covered with an EPDM rubber layer, which has excellent weather resistance, wear resistance, and corrosion resistance, resisting installation friction and media erosion. The shape memory rubber layer is snapped into the inside of the protective sleeve and adheres to the polyethylene pipe, forming multiple sealing barriers, significantly improving the anti-leakage performance and service life.

[0011] Preferably, the elastic mechanism includes a metal spring sheet, on which a round-headed claw is fixedly mounted. The metal spring sheet provides a stable elastic driving force to ensure that the round-headed claw fits tightly with the positioning groove. A convex groove is provided inside the protective sleeve, and the round-headed claw is slidably installed in the convex groove provided in the protective sleeve. The convex groove plays a limiting and guiding role for the round-headed claw, preventing the claw from deviating or jamming, and ensuring smooth sliding engagement.

[0012] Preferably, the linkage mechanism includes a wedge-shaped top block, which is slidably mounted inside the connecting sleeve. A return spring is fixedly mounted on the wedge-shaped top block. A sliding groove is formed inside the connecting sleeve, and the return spring is fixedly mounted on the top of the inner wall of the sliding groove to provide return power to the wedge-shaped top block, ensuring the reliability of the linkage mechanism during cyclic use. A movable baffle is installed inside the connecting sleeve, and a rectangular through hole is formed on the movable baffle. The movable baffle is fitted onto the wedge-shaped top block through the rectangular through hole. On the outer surface, the connecting sleeve has an insertion hole, and a locking screw is installed in the insertion hole. The lower end of the locking screw is threaded to the protective sleeve. The lower end of the locking screw is provided with a silicone pad with high friction. The silicone pad is attached to the surface of the polyethylene pipe, which can not only enhance the stability of the pipe fixation, but also avoid scratching the outer wall of the pipe, and at the same time help improve the sealing effect. The movable baffle is slidably installed in the insertion hole of the connecting sleeve. When it is not in position, it blocks the installation of the locking screw. When it is in position, it unlocks, realizing forced and precise control of the installation process.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In this invention, by axially spaced primary, secondary, and tertiary positioning grooves within the connecting sleeve, and in conjunction with the metal springs and round-headed claws of the elastic mechanism, positioning control is achieved during pipe insertion. Initially, the primary positioning groove and the round-headed claws make slight contact, using the fit between the claws and the groove to initially guide the pipe and adjust the coaxiality of the pipe and connecting sleeve in real time. This prevents subsequent misalignment of the sealing surface or increased insertion resistance due to pipe misalignment. When the pipe continues to be inserted to the secondary positioning groove, the round-headed claws engage with the groove under the elastic action of the metal springs. At this point, the secondary positioning groove... The positioning groove effectively buffers the insertion impact force on the claws and disperses the stress load on the metal spring. It prevents the spring from being overloaded and deformed due to excessive force during insertion, thus avoiding loss of elastic reset capability. Finally, when the pipe reaches the standard insertion depth, the round-headed claws accurately embed into the three-stage positioning groove, completing the depth locking of the pipe. This not only provides a precise trigger signal for the unlocking action of the subsequent linkage mechanism, but also ensures the fit between the pipe and the connecting sleeve and composite sealing layer, laying a stable foundation for subsequent sealing and fixing. Overall, it ensures the smoothness, accuracy and reliability of the positioning process, effectively reducing the installation rework rate caused by positioning deviation.

[0014] In this invention, a multi-dimensional and long-lasting leak-proof protection system is constructed by employing a layered composite sealing structure consisting of an inner shape memory rubber layer, a middle water-swellable rubber layer, and an outer EPDM rubber layer. A nickel-titanium alloy wire mesh is woven around the circumference of the shape memory rubber layer. The inner nickel-titanium alloy wire mesh, with its excellent rigidity and shape stability, provides uniform support to the shape memory rubber layer. When the pipeline experiences slight distortion due to temperature changes or minor vibrations, the nickel-titanium alloy wire mesh can limit excessive deformation of the rubber layer and simultaneously assist the shape memory rubber layer in quickly restoring its initial shape, ensuring that the sealing layer always adheres tightly to the outer wall of the pipeline and preventing sealing gaps caused by rubber layer deformation. The middle water-swellable rubber layer has the characteristic of expanding in volume upon contact with water. Even if there are tiny gaps on the sealing surface that are difficult to see with the naked eye, the expanded rubber layer can actively fill the gaps, forming an active sealing effect and effectively blocking the penetration path of water and liquid media. The outer EPDM rubber layer possesses excellent weather resistance, wear resistance, and corrosion resistance.

[0015] In this invention, through the coordinated design of the wedge-shaped top block, the moving baffle, and the locking screw in the linkage mechanism, an intelligent control logic is constructed to prevent accidental locking when not in place and to lock when in place. This completely avoids the problem of fixation failure caused by installation and operation errors in traditional connection devices. When the pipe is not inserted to the standard depth, the round-headed claw of the elastic mechanism is not embedded in the three-stage positioning groove. The wedge-shaped top block remains in a low position under the elastic force of the return spring. At this time, the moving baffle is limited by the wedge-shaped top block and is always in the insertion hole of the connecting sleeve. Its plate can directly block the downward path of the locking screw, preventing the locking screw from forming a threaded connection with the threaded hole of the protective sleeve. Structurally, this eliminates the possibility of operator misoperation in locking and avoids the pipe from locking due to insufficient insertion depth. If the sealing layer is not tightly bonded, media leakage or pipe detachment may occur during subsequent use. When the pipe is accurately inserted to the standard depth, the round-headed claws embed into the three-stage positioning groove and squeeze the top of the wedge block, causing the top of the wedge block to slide upward against the spring force of the return spring. At the same time, the rectangular through hole drives the moving baffle to move laterally, so that the moving baffle is completely removed from the insertion hole, unlocking the installation channel of the locking screw. When the operator tightens the locking screw, the high-friction silicone pad at its lower end can fit tightly against the outer wall of the polyethylene pipe, increasing the contact friction while avoiding the screw from causing indentation damage to the pipe surface. This achieves a three-in-one fixation of the connecting sleeve, protective sleeve and pipe, ensuring connection stability, improving operational accuracy, and reducing the technical threshold for installers.

[0016] In this invention, the protective sleeve of the positioning mechanism is fitted over the end of the polyethylene pipe, providing comprehensive protection for the outer wall and port of the pipe end during pipe transportation, handling, and insertion of the connecting sleeve. This prevents scratches and damage to the pipe end caused by collisions and friction, thus preventing the damaged area from becoming a weak point for media penetration. The device also features a compact design, with the positioning mechanism, elastic mechanism, and linkage mechanism all integrated inside the connecting sleeve and protective sleeve, eliminating redundant external components. This saves installation space and is suitable for pipe connection operations in narrow tunnels, wall cavities, and other confined spaces. It also allows operators to complete installation with one hand or with simple tools. Furthermore, each core component has a reset function. After loosening the locking screw, the wedge block top is reset under the force of the reset spring, and the moving baffle re-enters the insertion hole under the drive of the auxiliary spring. The metal spring of the elastic mechanism drives the round-headed claw to disengage from the positioning groove, allowing the device to be reused for multiple pipe connection operations, reducing material waste. Combined with the weather resistance and wear resistance of the composite sealing layer, the device does not require frequent replacement of sealing components during long-term use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the protective sleeve of the present invention; Figure 3This is a schematic diagram of the connecting sleeve of the present invention; Figure 4 This is a schematic diagram of the shape memory rubber layer of the present invention; Figure 5 This is a schematic diagram of the polyethylene pipe structure of the present invention; Figure 6 This is the present invention. Figure 2 Enlarged schematic diagram of the structure at point A; Figure 7 This is the present invention. Figure 3 Enlarged schematic diagram of the structure at point B; Figure 8 This is the present invention. Figure 3 A magnified schematic diagram of the structure at point C.

[0018] In the diagram, the correspondence between the component names and the attached drawing numbers is as follows: 1. Connecting sleeve; 2. Locking screw; 3. Insertion hole; 5. Sliding groove; 6. Return spring; 7. Moving baffle; 8. Rectangular through hole; 9. Wedge-shaped top block; 10. Protective sleeve; 11. Polyethylene pipe; 12. Convex groove; 13. Metal spring; 14. Round head claw; 15. Shape memory rubber layer; 16. Nickel-titanium alloy wire braided mesh; 17. Water-swellable rubber layer; 18. EPDM rubber layer; 19. Primary positioning groove; 20. Secondary positioning groove; 21. Tertiary positioning groove. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] Please see Figures 1-8 This invention provides an impact-resistant modified high-density polyethylene (HDPE) anti-leakage pipe connection device for achieving a sealed connection of impact-resistant modified HDPE pipes. The core includes a connecting sleeve 1, a positioning mechanism, an elastic mechanism, a linkage mechanism, and a composite intelligent sealing layer. Through the synergistic effect of each component, it achieves precise positioning of pipe insertion, anti-misoperation locking, and long-term anti-leakage sealing. The overall structure is compact and the operation is reliable. The number of positioning mechanisms, elastic mechanisms, and linkage mechanisms is six in each case, and the left and right sides of the connecting sleeve 1 are equipped with positioning mechanisms, elastic mechanisms, and linkage mechanisms.

[0021] Specifically, refer to Figure 2 , Figure 3As shown, the connecting sleeve 1 is a hollow tubular structure, serving as the basic load-bearing component of the entire device. Both ends of the sleeve have reserved mounting positions for positioning mechanisms, used to cooperate with the positioning mechanisms to achieve bidirectional pipe connection. The connecting sleeve 1 has three axially spaced positioning grooves: a primary positioning groove 19, a secondary positioning groove 20, and a tertiary positioning groove 21. All three positioning grooves are adapted to the elastic mechanism. The primary positioning groove 19 corresponds to 1 / 3 of the pipe insertion depth, the secondary positioning groove 20 corresponds to 2 / 3 of the insertion depth, and the tertiary positioning groove 21 represents the standard insertion depth. Together, they form a positioning system for guidance, transition, and precise locking. The connecting sleeve 1 also has a sliding groove 5 and a socket 3. The sliding groove 5 is used to install the return spring 6 and the wedge-shaped top block 9 of the linkage mechanism, while the socket 3 accommodates the locking screw 2 and the moving baffle 7, providing space for the movement of the linkage mechanism.

[0022] refer to Figure 2 , Figure 5 As shown, the positioning mechanism includes a protective sleeve 10, which is a tubular structure adapted to the outer diameter of the polyethylene pipe 11. It is sleeved on the outer side of the end of the polyethylene pipe 11, and its inner wall is tightly fitted with the outer wall of the polyethylene pipe 11, which protects the end of the polyethylene pipe 11 and prevents damage during the connection process. The protective sleeve 10 has a threaded hole for threaded connection with the locking screw 2. It also has a convex groove 12 inside, which is arranged around the protective sleeve 10 to provide limiting space for the installation and sliding of the elastic mechanism.

[0023] refer to Figure 2 As shown, the composite intelligent sealing layer is set inside the connecting sleeve 1 and snapped into the protective sleeve 10, tightly fitting the outer wall of the polyethylene pipe 11 to form multiple sealing protections. This sealing layer adopts a layered composite structure. The inner layer is a shape memory rubber layer 15, whose circumferential surface is woven with a nickel-titanium alloy wire mesh 16. The nickel-titanium alloy wire mesh 16 provides rigid support for the shape memory rubber layer 15, ensuring that it can self-correct after slight twisting. The middle layer is a water-swellable rubber layer 17, which is fitted on the circumferential surface of the nickel-titanium alloy wire mesh 16. It can expand in volume after contact with water, filling the tiny gaps in the sealing surface. The outer layer is a EPDM rubber layer 18, which is fitted on the outside of the water-swellable rubber layer 17. It has excellent weather resistance and wear resistance, can resist installation friction and media corrosion, and extend the service life of the sealing layer.

[0024] refer to Figure 2 , Figure 6As shown, the elastic mechanism includes a metal spring 13 and a round-headed claw 14. The metal spring 13 is fixedly installed inside the protective sleeve 10, and the round-headed claw 14 is fixedly connected to the metal spring 13 and slidably installed in the convex groove 12 opened in the protective sleeve 10. The metal spring 13 has elastic deformation capability, which can drive the round-headed claw 14 to slide flexibly in the convex groove 12, so that the round-headed claw 14 can form a sliding engagement with the primary positioning groove 19, the secondary positioning groove 20, and the tertiary positioning groove 21 of the connecting sleeve 1. This provides guiding feedback for pipe insertion and can trigger the linkage mechanism to act when the standard depth is reached.

[0025] refer to Figure 3 , Figure 7 , Figure 8 As shown, the linkage mechanism is used to control the locking of the connecting sleeve 1 and the positioning mechanism. Its core components include a wedge-shaped top block 9, a return spring 6, a moving baffle 7, a locking screw 2, and a spring plate. These components work together to prevent accidental locking when not in position and to lock when in position. The wedge-shaped top block 9 is slidably installed inside the connecting sleeve 1, with its lower end corresponding to the round-headed claw 14. The upper end is fixedly connected to the return spring 6. The end of the return spring 6 away from the wedge-shaped top block 9 is fixedly installed on the top of the inner wall of the sliding groove 5 in the connecting sleeve 1, providing the return force for the wedge-shaped top block 9. The moving baffle 7 has a through-hole opening... A rectangular through hole 8 is fitted onto the outer surface of the wedge-shaped top block 9. The movable baffle 7 is slidably installed in the insertion hole 3 of the connecting sleeve 1, which can block the locking screw 2 in the insertion hole 3. The locking screw 2 is installed in the insertion hole 3 of the connecting sleeve 1, and its lower end is threadedly connected to the threaded hole of the protective sleeve 10. The lower end of the locking screw 2 is provided with a high-friction silicone pad, which can fit tightly against the surface of the polyethylene pipe 11 to enhance the fixing stability. The spring is set between the left end of the movable baffle 7 and the connecting sleeve 1 to provide elastic force for the reset of the movable baffle 7.

[0026] Specifically, the working logic of the linkage mechanism is as follows: When the polyethylene pipe 11 drives the protective sleeve 10 to insert into the connecting sleeve 1, if the round-headed claw 14 of the elastic mechanism does not enter the three-stage positioning groove 21, that is, the pipe does not reach the standard insertion depth, the moving baffle 7 remains in the insertion hole 3, blocking the locking screw 2 so that it cannot achieve threaded connection with the threaded hole of the protective sleeve 10, thus avoiding fixation failure due to insufficient insertion depth. When the pipe is inserted to the standard depth, the round-headed claw 14 is embedded in the three-stage positioning groove 21 under the elastic action of the metal spring 13. At this time, the round-headed claw 14 will squeeze the wedge-shaped block top block 9, causing the wedge-shaped block top block 9 to overcome the elastic force of the return spring 6 and move upward. During the movement of the wedge-shaped top block 9, the moving baffle 7 moves synchronously through the rectangular through hole 8, causing the moving baffle 7 to move out of the insertion hole 3 of the connecting sleeve 1. This unlocks the locking screw 2, allowing the operator to screw the locking screw 2 into the threaded hole of the protective sleeve 10, so that the silicone pad at its lower end fits tightly against the surface of the polyethylene pipe 11, thus fixing the connecting sleeve 1, the protective sleeve 10, and the polyethylene pipe 11. When disassembly or resetting is required, after loosening the locking screw 2, the wedge-shaped top block 9 returns to its original position under the elastic action of the return spring 6, and the moving baffle 7 resets synchronously under the drive of the spring plate, re-entering the insertion hole 3 to prepare for the next connection.

[0027] Furthermore, the primary positioning groove 19 and the secondary positioning groove 20 are not superfluous. The primary positioning groove 19 makes slight contact with the round-headed claw 14 at the initial stage of pipe insertion, providing guidance and coaxiality calibration to prevent pipe misalignment from causing subsequent positioning deviations. The secondary positioning groove 20 can buffer the force on the claw to prevent the metal spring 13 from being overloaded and deformed due to excessive force during insertion. This ensures the precise locking of the tertiary positioning groove 21 and the round-headed claw 14. The three work together to ensure the smoothness and accuracy of the positioning process.

[0028] Working principle: The first step is to place the protective sleeve 10 onto the end of the polyethylene pipe 11, ensuring that the inner wall of the protective sleeve 10 is tightly fitted to the outer wall of the polyethylene pipe 11. At the same time, confirm that the composite intelligent sealing layer (inner shape memory rubber layer 15, middle water-swellable rubber layer 17, outer EPDM rubber layer 18, and the circumferential surface of the shape memory rubber layer 15 is woven with nickel-titanium alloy wire mesh 16) has been snapped into the inside of the protective sleeve 10, and that the composite intelligent sealing layer is initially fitted to the outer wall of the polyethylene pipe 11, thus completing the component assembly before connection.

[0029] The second step is to align the polyethylene pipe 11, which is fitted with the protective sleeve 10, with one end of the connecting sleeve 1 and slowly insert it into the connecting sleeve 1. In the initial stage of insertion, the round-headed claw 14 of the elastic mechanism, supported by the metal spring 13, makes slight contact with the primary positioning groove 19 inside the connecting sleeve 1. With the help of the matching relationship between the round-headed claw 14 and the primary positioning groove 19, the coaxiality of the polyethylene pipe 11 and the connecting sleeve 1 is calibrated in real time to avoid pipe misalignment, which could lead to misalignment of the sealing surface of the composite intelligent sealing layer or abnormal insertion resistance.

[0030] The third step involves continuing to push the polyethylene pipe 11 deeper into the connecting sleeve 1. When the round-headed claw 14 moves with the polyethylene pipe 11 and the protective sleeve 10 to the position of the secondary positioning groove 20 of the connecting sleeve 1, the metal spring 13 undergoes elastic deformation, causing the round-headed claw 14 to engage with the secondary positioning groove 20. At this time, the secondary positioning groove 20 disperses the insertion impact force on the round-headed claw 14, buffers the load on the metal spring 13, and prevents the metal spring 13 from being overloaded and deformed due to excessive insertion force, thus losing its elastic function.

[0031] Fourth step, continue inserting the polyethylene pipe 11 to the standard depth. Under the elastic restoring force of the metal spring 13, the round-headed claw 14 is precisely embedded in the three-stage positioning groove 21 of the connecting sleeve 1, completing the depth positioning of the polyethylene pipe 11. At the same time, the round-headed claw 14 squeezes the wedge-shaped block top block 9 of the linkage mechanism, causing the wedge-shaped block top block 9 to overcome the elastic force of the return spring 6 and move upward along the sliding groove 5 inside the connecting sleeve 1. During the upward movement of the wedge-shaped block top block 9, the rectangular through hole 8 opened on the moving baffle 7 drives the moving baffle 7 to slide horizontally in sync, and finally the moving baffle 7 is completely removed from the insertion hole 3 of the connecting sleeve 1, unlocking the installation channel of the locking screw 2.

[0032] Fifth step, the operator screws the locking screw 2 into the insertion hole 3 of the connecting sleeve 1, so that its lower end forms a threaded connection with the threaded hole of the protective sleeve 10. During the tightening process, the high-friction silicone pad at the lower end of the locking screw 2 gradually adheres tightly to the surface of the polyethylene pipe 11, realizing the three-in-one fixation of the connecting sleeve 1, the protective sleeve 10 and the polyethylene pipe 11. At the same time, the composite intelligent sealing layer is further adhered under the squeezing action of the polyethylene pipe 11 and the connecting sleeve 1. The water-swellable rubber layer 17 is in a state of waiting to be activated. The outer EPDM rubber layer 18 resists installation friction, and the inner nickel-titanium alloy wire braided mesh 16 ensures the shape stability of the shape memory rubber layer 15, enhancing the overall sealing effect.

[0033] Step 6: When disassembly or reconnection is required, first loosen the locking screw 2 in the reverse direction so that the silicone pad at its lower end is removed from the surface of the polyethylene pipe 11. At this time, the wedge block top block 9 is reset downward along the sliding groove 5 of the connecting sleeve 1 under the elastic force of the reset spring 6. The moving baffle 7 moves synchronously under the drive of its left spring piece and re-embeds into the insertion hole 3 of the connecting sleeve 1, restoring the blocking function of the locking screw 2. At the same time, the metal spring piece 13 drives the round head claw 14 to disengage from the three-stage positioning groove 21 of the connecting sleeve 1. Pulling the polyethylene pipe 11 outward can separate it from the connecting sleeve 1. All components of the device (connecting sleeve 1, protective sleeve 10, elastic mechanism, linkage mechanism, composite intelligent sealing layer) return to their initial state and can be used for the next pipe connection.

[0034] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A leak-proof pipe connection device made of impact-resistant modified high-density polyethylene, comprising a connecting sleeve (1), characterized in that: The connecting sleeve (1) is provided with positioning mechanisms at both ends, which are used to cover the ends of the polyethylene pipe (11); The positioning mechanism is provided with an elastic mechanism, which is used to fix the positioning mechanism and the connecting sleeve (1); The connecting sleeve (1) is provided with a linkage mechanism, which is used to control the installation of the connecting sleeve (1) and the positioning mechanism.

2. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 1, characterized in that, The connecting sleeve (1) has a first-level positioning groove (19), a second-level positioning groove (20) and a third-level positioning groove (21) inside. The linkage mechanism is located in the third-level positioning groove (21) of the connecting sleeve (1). The elastic mechanism slides and engages in the first-level positioning groove (19), the second-level positioning groove (20) and the third-level positioning groove (21).

3. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 2, characterized in that, The positioning mechanism includes a protective sleeve (10) and a polyethylene pipe (11). The protective sleeve (10) is sleeved on the polyethylene pipe (11). The inner wall of the end of the protective sleeve (10) is in contact with the polyethylene pipe (11). The protective sleeve (10) has a threaded hole.

4. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 3, characterized in that, The connecting sleeve (1) is provided with a shape memory rubber layer (15) inside. The circumferential surface of the shape memory rubber layer (15) is woven with a nickel-titanium alloy wire mesh (16). The circumferential surface of the nickel-titanium alloy wire mesh (16) is covered with a water-swellable rubber layer (17). The water-swellable rubber layer (17) is covered with a EPDM rubber layer (18). The shape memory rubber layer (15) is snapped into the protective sleeve (10) and fits against the polyethylene pipe (11).

5. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 4, characterized in that, The elastic mechanism includes a metal spring (13), on which a round-headed claw (14) is fixedly installed. A convex groove (12) is opened inside the protective sleeve (10), and the round-headed claw (14) is slidably installed in the convex groove (12) opened in the protective sleeve (10).

6. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 5, characterized in that, The linkage mechanism includes a wedge-shaped top block (9), which is slidably installed inside the connecting sleeve (1). A reset spring (6) is fixedly installed on the wedge-shaped top block (9). A sliding groove (5) is opened inside the connecting sleeve (1), and the reset spring (6) is fixedly installed on the top of the inner wall of the sliding groove (5) opened in the connecting sleeve (1).

7. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 6, characterized in that, A movable baffle (7) is installed inside the connecting sleeve (1). A rectangular through hole (8) is provided on the movable baffle (7). The movable baffle (7) is fitted onto the outer surface of the wedge block top block (9) through the rectangular through hole (8).

8. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 7, characterized in that, The connecting sleeve (1) has an insertion hole (3), and a locking screw (2) is installed in the insertion hole (3) of the connecting sleeve (1).

9. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 8, characterized in that, The lower end of the locking screw (2) is threaded to the protective sleeve (10). The lower end of the locking screw (2) is provided with a silicone pad with high friction, which is attached to the surface of the polyethylene pipe (11).

10. The impact-resistant modified high-density polyethylene leak-proof pipe connection device as described in claim 9, characterized in that, The movable baffle (7) is slidably installed in the insertion hole (3) of the connecting sleeve (1).

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