Replaceable lining structure of wear-resistant plastic pipe

Abstract

The invention relates to the field of pipeline linings, in particular to a replaceable lining structure of a wear-resistant plastic pipe. The replaceable lining structure of the wear-resistant plastic pipe comprises an outer plastic pipe body, a lining unit and a locking unit, the lining unit is formed by splicing a plurality of independent arc-shaped lining plates and arranged in the outer plastic pipe body, and a first flange plate is arranged at the end of the outer plastic pipe body. The locking unit is arranged at the joint of every two adjacent outer plastic pipe bodies and connected with the first flange plate and the lining unit. According to the replaceable lining structure of the wear-resistant plastic pipe, the lining is designed into the multiple independent arc-shaped lining plates, and the lining plates are slidably mounted in cooperation with the radial locking assembly, so that any single worn lining plate can independently slide out of the end of the pipeline to be replaced, the whole pipeline does not need to be disassembled or adjacent intact parts do not need to be affected, and the replacement efficiency is improved. The replacement and use cost is reduced, and precise maintenance is achieved.

Description

Technical Field

[0001] This invention relates to field A, and more particularly to a replaceable liner structure for wear-resistant plastic tubes. Background Technology

[0002] In the field of industrial material transportation, especially in industries such as mining, metallurgy, and power, pipeline systems transporting abrasive and corrosive slurries or tailings face severe wear challenges. To extend pipeline life, wear-resistant linings are often installed inside the pipelines.

[0003] Existing lining structures mainly include integral wear-resistant pipes, split-type linings or flange-connected linings, and adhesive or cast-in-place linings. Integral wear-resistant pipes are made of high-wear-resistant materials such as ultra-high molecular weight polyethylene and ceramic composite pipes. Although they offer excellent wear resistance, once a section wears through or corrodes, the entire pipe section will fail, resulting in high replacement costs and resource waste. Split-type linings or flange-connected linings divide the lining into several sections, connected by internal flanges or socket structures. While this approach allows for lining replacement, the protrusions or steps formed at the joints severely disrupt the slurry flow, causing eddies and secondary wear, becoming new wear points, reducing conveying efficiency, and making installation and disassembly extremely inconvenient due to the narrow internal connection space. Adhesive or cast-in-place linings involve bonding wear-resistant rubber sheets, ceramic plates, etc., to the inner wall of the pipe with adhesives, or casting wear-resistant materials on-site within the pipe to form the lining layer. This method involves complex construction processes, requires high environmental conditions and skilled workers, and the bonding quality between the inner lining and the pipe wall is unstable, making it prone to localized detachment. Furthermore, the replacement process requires extensive removal of the old lining, resulting in a long maintenance cycle.

[0004] Therefore, it is necessary to provide a new replaceable liner structure for wear-resistant plastic tubes to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a replaceable inner lining structure for wear-resistant plastic pipes.

[0006] The replaceable inner liner structure of the wear-resistant plastic pipe provided by the present invention includes an outer plastic pipe body, an inner liner unit and a locking unit; the inner liner unit is composed of multiple independent arc-shaped inner liner plates and is disposed inside the outer plastic pipe body, and a flange is provided at the end of the outer plastic pipe body. The locking unit is located at the connection between two adjacent sections of the outer plastic pipe body and is connected to the flange and the inner lining unit.

[0007] Preferably, a radial locking assembly is provided between the inner liner and the outer plastic tube body, the radial locking assembly including a sub-connection structure and a female connection structure; The sub-connection structure is disposed on the inner wall of the outer plastic tube body, and the female connection structure is disposed on the outer wall of the inner lining plate.

[0008] Preferably, the sub-connection structure is a T-shaped insert rail, and the female connection structure is a T-shaped insert rail that matches the T-shaped insert rail. Preferably, the side end face of the inner liner plate is provided with a sealing connection component. The sealing assembly includes a female assembly structure disposed on one end face of the inner liner and a female assembly structure disposed on the other end face, wherein the female assembly structure and the female assembly structure cooperate with each other.

[0009] Preferably, the mother assembly structure is a stepped groove, and the daughter assembly structure is a stepped protrusion that cooperates with the stepped groove.

[0010] Preferably, the inner wall of the end of the inner lining plate is provided with an inner groove, and a wedge-shaped locking block is provided at the bottom of the inner groove.

[0011] Preferably, the locking unit includes an assembly tube, with extension tubes at both ends of the assembly tube, and a trapezoidal locking groove is formed on the outer end wall of the extension tube.

[0012] Preferably, the extension tube is inserted into the annular groove formed by the inner groove, and the trapezoidal locking groove cooperates with the wedge-shaped locking block.

[0013] Preferably, a second flange is provided on the outer circumferential surface of the assembly pipe, and the second flange is fixed to the first flange by long bolts.

[0014] Compared with related technologies, the replaceable inner liner structure of the wear-resistant plastic tube provided by the present invention has the following beneficial effects: By designing the liner as multiple independent arc-shaped liner plates and using radial locking components for sliding installation, any single worn liner plate can be slid out and replaced individually from the end of the pipe without disassembling the entire pipe section or affecting adjacent intact parts, reducing replacement and usage costs and achieving precise maintenance.

[0015] The inner lining plates are joined together by a precision-fitted sealing assembly and then locked together by an end locking unit. This results in the joined lining plates forming a complete cylinder with a smooth inner wall, free of protrusions and steps. This reduces flow resistance, avoids eddies and localized wear, and ensures the stability of the conveying system. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the replaceable inner liner structure of the wear-resistant plastic tube provided by the present invention; Figure 2 This is a schematic diagram of the structure of the outer plastic tube body shown in this invention; Figure 3This is a schematic diagram of the structure of the inner lining plate shown in the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the inner lining plate shown in the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the locking unit shown in the present invention.

[0017] The following are the labels in the diagram: 1. Outer plastic pipe body; 2. Flange 1; 3. Sub-connection structure; 4. Inner liner; 5. Female connection structure; 6. Female assembly structure; 7. Sub-assembly structure; 8. Inner groove; 9. Wedge-shaped locking block; 10. Assembly pipe; 11. Extension pipe; 12. Trapezoidal locking groove; 13. Flange 2. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0020] Please see Figures 1 to 5 The replaceable inner liner structure of the wear-resistant plastic pipe provided in this embodiment of the invention includes an outer plastic pipe body 1, an inner liner unit, and a locking unit.

[0021] The outer plastic pipe body 1 has an integrally connected flange 2 at one end, which is used to connect and fix adjacent pipe sections to form a complete pipeline system.

[0022] The inner lining unit is not a single, monolithic tubular structure, but rather a complete cylindrical lining structure assembled circumferentially from multiple independent, arc-shaped inner lining plates 4. The inner lining plates 4 are fixed inside the outer plastic tube body 1 using radial locking components. After installation, the center point of the inner lining plate 4 along the pipe axis is aligned with the center point of the outer plastic tube body 1, ensuring the entire assembled inner lining cylinder is correctly centered along the pipe's length. Furthermore, the axial length of the inner lining plate 4 is slightly less than the axial length of the outer plastic tube body 1. Therefore, after the inner lining plate 4 is positioned using the radial locking components, an annular axial gap of a certain width is formed between its two end faces and the corresponding two end ports of the outer plastic tube body 1. This provides a spatial basis for the subsequent installation and operation of the locking unit for overall locking at the pipe ends, further enhancing the stability of the entire cylindrical lining structure within the outer plastic tube body 1.

[0023] The radial locking assembly is used for a stable connection between the inner liner plate 4 and the outer plastic tube body 1, and each inner liner plate 4 and the outer plastic tube body 1 is equipped with a set of radial locking assemblies. That is, the radial locking assembly consists of two parts: a sub-connecting structure 3 and a female connecting structure 5 that match each other. The sub-connecting structure 3 is a basic component that is directly integrated with the outer plastic tube body 1. It is a raised track extending inward along the pipe port and along its inner wall surface in the axial direction. The cross-section of the track is a regular "T" shape with flanges on both sides, which is called a T-shaped insert. These T-shaped inserts are evenly distributed in the inner circumference of the pipe and are connected and fixed to the inner wall of the pipe by means of one-time molding or reliable welding, thereby providing a stable and non-displaceable installation base. The female connecting structure 5 is set on the outer arc wall surface of the inner liner plate 4. It is a groove opened along the entire axial length of the inner liner plate 4, and its cross-sectional shape is adapted to the T-shaped insert of the sub-connecting structure 3 to form a sliding fit, which is called a T-shaped slot. Therefore, the initial installation of the inner lining plate 4 can be achieved through this connection structure.

[0024] The length of the T-shaped slot is exactly the same as the axial length of the inner liner plate 4. Therefore, when the inner liner plate 4 is pushed in for installation, the T-shaped slot on its entire back side can achieve full-length, uninterrupted insertion and fit with the T-shaped insert on the inner wall of the pipe. This ensures that the inner liner plate 4 has no axial wobble or gap, and is restricted radially by the interlocking action of the T-shaped structure, preventing it from coming loose towards the center of the pipe. It also provides a uniform and continuous support surface for the inner liner plate 4 to withstand loads from fluid pressure, greatly enhancing the stability and load-bearing capacity of the overall structure.

[0025] To achieve a tight seal between adjacent inner liner plates 4 and prevent leakage of the conveying medium, a sealing assembly is provided on the side end face of each inner liner plate 4. This sealing assembly consists of two parts: a matching female assembly structure 6 and a female assembly structure 7. Specifically, on one side end face of any inner liner plate 4 along the circumferential direction, a multi-level groove with an inwardly recessed, stepped cross-section is machined or formed; this is the female assembly structure 6. On the opposite side end face of the inner liner plate 4, a corresponding multi-level protrusion with an outwardly protruding cross-sectional shape precisely complementary to the stepped groove of the female assembly structure 6 is provided; this is the female assembly structure 7. When the two inner lining plates 4 are assembled together, the sub-assembly structure 7 (stepped protrusion) on the side end face of one inner lining plate 4 will precisely insert into the female assembly structure 6 (stepped groove) on the side end face of the adjacent inner lining plate 4. This stepped fitting method first achieves an interlocking effect mechanically, which can effectively limit the relative displacement of adjacent inner lining plates 4 in the radial and tangential directions, and enhance the integrity of the assembled body. At the same time, on the flat end face (usually a straight or slightly inclined surface perpendicular to the axial direction) of one or more stages of the interlocking stepped protrusions and stepped grooves, strip-shaped gasket mounting grooves are pre-cut, and elastic gaskets are embedded in them. When the sub-assembly structure 7 is fully inserted into the female assembly structure 6 and finally comes into position, the elastic gasket will be uniformly compressed and deformed, thereby filling the gap between the two adjacent inner lining plates 4, so as to form multiple sealing bands at the lateral joint of the two adjacent inner lining plates 4. This design, which combines mechanical interlocking (through a stepped structure) with elastic compression sealing (through a sealing ring), ensures that the lateral joints between the inner liner plates 4 remain tightly sealed even under conditions of internal fluid pressure fluctuations or slight pipe deformation, thus preventing media leakage and penetration.

[0026] To ensure that all inner liner plates 4 can be reliably tightened at the pipe ends and prevent radial loosening or axial displacement under internal pressure or vibration, an axially extending inner groove 8 is formed on the inner wall surface of the end of each inner liner plate 4 (i.e., the end closest to the pipe port). When all inner liner plates 4 are assembled into a complete cylindrical liner, these inner grooves 8 located on each inner liner plate 4 will connect together at the inner wall of the end of the liner to form a continuous annular groove that surrounds the inner wall. This annular groove provides a clear structural positioning space for subsequent locking operations. Furthermore, on each inner liner plate 4, at the bottom of its inner groove 8 (i.e., the bottom position in the depth direction of the inner groove 8), there is a protrusion of a specific shape, namely a wedge-shaped locking block 9, integrally connected to the inner liner plate 4 itself (e.g., through one-time casting or structural welding). The wedge-shaped locking block 9 extends axially from the bottom of the groove, so that when all the inner lining plates 4 are assembled, the two wedge-shaped locking blocks 9 on adjacent inner lining plates 4 will approach each other circumferentially and fit sideways. Since the two sides of each wedge-shaped locking block 9 are usually designed as symmetrical bevels, the combination of these two adjacent wedge-shaped locking blocks 9 forms an approximately isosceles trapezoidal block in its overall outline. The upper base (shorter side) of this isosceles trapezoidal block faces the pipe opening, while the lower base (longer side) connects to the bottom area of ​​the inner groove 8 to achieve a precise fit with the locking unit and further fix the entire cylindrical lining. That is, when an axial force is applied from the pipe port to push the outer locking ring into the annular space formed by all the wedge-shaped locking blocks 9, the locking unit will contact the inclined surface of the isosceles trapezoidal block and generate a radial component force, thereby synchronously and evenly pressing all the wedge-shaped locking blocks 9 (along with their respective inner lining plates 4) outward, making them more firmly attached to the inner wall of the outer plastic pipe body 1, so as to achieve radial locking and axial limiting of all the ends of the inner lining plates 4.

[0027] The locking unit is an assembly tube 10. During installation, this assembly tube 10 is axially inserted and positioned within the annular gap pre-formed between the end of the inner liner plate 4 and the end of the outer plastic tube body 1, with the end of the assembly tube 10 abutting against the end of the inner liner plate 4. Extension tubes 11 are integrally connected to both ends of the assembly tube 10. The inner diameter of these two extension tubes 11 is consistent with the inner diameter of the main assembly tube 10, ensuring the continuity and unobstructed flow of the entire locking unit's internal channels without causing additional obstruction to the fluid. However, the outer diameter of the extension tubes 11 is smaller than that of the assembly tube 10, creating a stepped structure. This reduced outer diameter allows the extension tubes 11 to be smoothly and concentrically inserted into the annular groove formed by the inner grooves 8 at the ends of all the inner liner plates 4. A trapezoidal locking groove 12 is machined around the circumference of each extension tube 11 on its outer end wall (i.e., the end furthest from the center of the assembly tube 10). This trapezoidal locking groove 12 can complement and fit the isosceles trapezoidal block formed by the wedge-shaped locking block 9 on the adjacent inner lining plate 4. When the extension tube 11 is inserted into the annular groove, these isosceles trapezoidal blocks are precisely embedded in the corresponding trapezoidal locking groove 12, thereby achieving effective clamping and limiting of all ends of the inner lining plate 4 in both the circumferential and axial directions.

[0028] At the center of the outer circumference of the assembly pipe 10, a flange 2 13 is integrally formed. When this locking unit is placed between the ends of the two outer plastic pipe bodies 1, this flange 2 13 is precisely located in the middle of the flange 1 2 that is attached to the two outer plastic pipe bodies 1. By using long bolts to sequentially pass through the corresponding bolt holes on the first flange 1 2, flange 2 13, and second flange 1 2, and tightening the nuts, a locking unit can be securely connected to both the front and rear outer plastic pipe bodies 1. This design not only fixes the locking unit itself, but more importantly, through the clamping force of the flange, it ensures the clamping effect of the extension pipe 11 on the wedge-shaped locking block 9, as well as the seal between the entire locking unit and the end faces of the pipe bodies on both sides, ultimately completing the fastening of the liner and the connection of the pipe sections.

[0029] The specific disassembly and assembly process for this lining is as follows: First step: When disassembling the old inner liner 4, first use a tool to loosen and remove the bolts on the flange 2 connecting the two adjacent sections of the outer plastic pipe body 1, separating the pipe from the connection. At this time, the assembly pipe 10 of the locking unit and its flange 2 13 can be temporarily retained with one side of the pipe section or removed separately. Subsequently, the entire locking unit (assembly pipe 10 and extension pipe 11) can be pulled out axially from the annular groove formed by the inner groove 8 at the end of the inner liner 4. Next, starting from the end of the pipe, slide the arc-shaped inner liner 4 one by one along the T-shaped rail (sub-connection structure 3) on the inner wall of the outer plastic pipe body 1 in the opposite direction, and each inner liner 4 can be pulled out of the pipe in sequence. If the sealing assembly (mother assembly structure 6 and sub-assembly structure 7) on the side end face of the inner liner 4 is difficult to separate due to tight fit, a soft tool can be used to gently pry it open from the joint to assist in disassembly.

[0030] Step 2: Before installing the new inner liner 4, check whether the T-shaped inserts (sub-connection structures 3) on the inner wall of the outer plastic pipe body 1 are clean and intact. Take a new arc-shaped inner liner 4, align the T-shaped slot (female connection structure 5) on its outer wall and insert it into the end of a T-shaped insert, then push it smoothly along the pipe axis until it reaches the designed position. Repeat this process to install the remaining inner liner 4 in sequence. When assembling adjacent inner liner 4, ensure that the sub-assembly structure 7 (stepped protrusion) on the side of one plate is accurately aligned and embedded with the female assembly structure 6 (stepped groove) on the side of the adjacent plate, and use the stepped interlocking structure to make them close together tightly. When all the inner liner 4 are assembled into a complete cylindrical inner liner in the circumferential direction, an annular gap will naturally form between its two ends and the port of the outer plastic pipe body 1, and the wedge-shaped locking blocks 9 at the ends of each plate will jointly form a continuous isosceles trapezoidal block ring.

[0031] Step 3: Place the assembly tube 10 of the locking unit between the ends of the two outer plastic pipe bodies 1 to be connected, ensuring that its flange 13 is located in the middle of the flanges 2 of the two pipe sections. Insert the extension tubes 11 at both ends of the assembly tube 10 into the annular grooves formed by the inner grooves 8 at the ends of the installed inner liner plates 4, and ensure that the trapezoidal locking grooves 12 at the outer ends of the extension tubes 11 are precisely fitted into the isosceles trapezoidal blocks formed by the wedge-shaped locking blocks 9 on the inner liner plates 4. Adjust and align the bolt holes of all flanges (the two flanges 2 and the middle flange 13), insert the connecting bolts, and tighten the nuts evenly and gradually. As the flanges are tightened, the locking unit is axially fixed. The extension tubes 11, through the cooperation of the trapezoidal locking grooves 12 and the wedge-shaped locking blocks 9, provide radial constraint and axial limitation to all ends of the inner liner plates 4, thereby completing the final fastening of the inner liner and the sealing connection of the pipe sections.

[0032] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A replaceable inner liner structure for a wear-resistant plastic pipe, comprising an outer plastic pipe body (1), an inner liner unit, and a locking unit, characterized in that: The inner lining unit is composed of multiple independent arc-shaped inner lining plates (4) and is placed inside the outer plastic pipe body (1). The end of the outer plastic pipe body (1) is provided with a flange (2). The locking unit is located at the connection between two adjacent sections of the outer plastic pipe body (1) and is connected to the flange (2) and the inner lining unit.

2. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 1, characterized in that, A radial locking assembly is provided between the inner lining plate (4) and the outer plastic tube body (1), the radial locking assembly including a sub-connection structure (3) and a female connection structure (5). The sub-connection structure (3) is disposed on the inner wall of the outer plastic tube body (1), and the female connection structure (5) is disposed on the outer wall of the inner lining plate (4).

3. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 2, characterized in that, The sub-connection structure (3) is a T-shaped insert rail, and the mother connection structure (5) is a T-shaped slot that matches the T-shaped insert rail.

4. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 1, characterized in that, The inner lining plate (4) is provided with a sealing and bonding assembly on its side end face; The sealing assembly includes a female assembly structure (6) disposed on one end face of the inner liner plate (4) and a female assembly structure (7) disposed on the other end face, wherein the female assembly structure (6) and the female assembly structure (7) cooperate with each other.

5. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 4, characterized in that, The mother assembly structure (6) is a stepped groove, and the daughter assembly structure (7) is a stepped protrusion that cooperates with the stepped groove.

6. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 1, characterized in that, The inner wall of the end of the inner lining plate (4) is provided with an inner groove (8), and a wedge-shaped locking block (9) is provided at the bottom of the groove (8).

7. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 1, characterized in that, The locking unit includes an assembly tube (10), and extension tubes (11) are provided at both ends of the assembly tube (10). A trapezoidal locking groove (12) is provided on the outer end wall of the extension tube (11).

8. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 7, characterized in that, The extension tube (11) is inserted into the annular groove formed by the inner groove (8), and the trapezoidal locking groove (12) cooperates with the wedge-shaped locking block (9).

9. The replaceable inner lining structure of the wear-resistant plastic pipe according to claim 7, characterized in that, The outer circumferential surface of the assembly pipe (10) is provided with flange two (13), and flange two (13) is fixed to flange one (2) by long bolts.

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