PTFE (Polytetrafluoroethylene) reinforced wear-resistant plastic composite pipe and connecting piece for conveying tailings and slurry

Abstract

The utility model provides a PTFE (Polytetrafluoroethylene) reinforced wear-resistant plastic composite pipe and a connecting piece for conveying tailings and slurry, and relates to the field of conveying pipelines. The composite pipe comprises a wear-resistant matrix layer, a reinforcing layer and an outer protective layer which are sequentially stacked from inside to outside, the wear-resistant matrix layer is formed by extruding modified PTFE or co-extruding modified PTFE / PE, and the modified PTFE is extruded to form an inner wear-resistant layer; the reinforcing layer is formed by winding a high-strength steel wire according to a spiral angle of 54 degrees and 45 minutes + / -2 degrees; and the outer protection layer is formed by extruding PE or modified PTFE. The connecting piece is used for connecting the composite pipe, and the connecting end of the composite pipe is turned over outwards to form a turned-over edge; the connecting piece comprises a metal outer sleeve and a flange plate, the longitudinal section of the metal outer sleeve is step-shaped, and the metal outer sleeve comprises a small-diameter first ring part and a large-diameter second ring part; the flanging is embedded in the inner side of the second ring part; and the flange plate sleeves the outer side of the first ring part or the second ring part.

Description

Technical Field

[0001] This utility model relates to the field of conveying pipelines, and more specifically, to PTFE-reinforced wear-resistant plastic composite pipes and connectors for conveying tailings and slurries. Background Technology

[0002] Tailings conveying pipes are pipes used to transport materials such as tailings, slurry, and chemical slurry. Existing tailings and slurry conveying systems mostly use metal pipes (such as steel pipes or rubber-lined pipes) or pure plastic pipes (such as ultra-high molecular weight polyethylene pipes), which have the following shortcomings:

[0003] Metal pipes are prone to corrosion, heavy, and lack wear resistance; while ordinary plastic pipes have low strength, are easily deformed under long-term pressure, and have poor temperature resistance.

[0004] In existing technologies, some composite pipes are reinforced with steel wire, but the bonding strength between the reinforcing layer and the plastic matrix is ​​insufficient, making them prone to delamination and failure. Simultaneously, the inner layer lacks sufficient wear resistance, resulting in a short pipe lifespan. Furthermore, the connection structure at the pipe joints is unstable, easily causing slurry leakage, which is detrimental to long-term continuous transportation. Utility Model Content

[0005] The purpose of this utility model is to provide a PTFE-reinforced wear-resistant plastic composite pipe and connectors for tailings and slurry transportation, which has excellent wear resistance, strong impact resistance, corrosion resistance and lightweight properties, and can improve connection stability and sealing performance.

[0006] The embodiments of this utility model are implemented as follows:

[0007] This application provides a PTFE-reinforced wear-resistant plastic composite pipe for tailings and slurry transportation, comprising a wear-resistant matrix layer, a reinforcing layer, and an outer protective layer stacked sequentially from the inside out.

[0008] The wear-resistant matrix layer is formed by modified PTFE extrusion or modified PTFE / PE co-extrusion, wherein the modified PTFE extrusion is the inner wear-resistant layer;

[0009] The reinforcing layer is formed by winding high-strength steel wire at a helical angle of 54°45′±2°.

[0010] The outer protective layer is formed by extrusion of PE or modified PTFE.

[0011] Furthermore, based on the aforementioned scheme, the modified PTFE contains 5%–10% nano-silicon carbide and 1%–3% graphene.

[0012] Furthermore, based on the aforementioned scheme, the surface of the reinforcing layer is provided with a polyaramid fiber transition layer.

[0013] Furthermore, based on the aforementioned scheme, the wear-resistant substrate layer and the reinforcing layer are fused together using an adhesive resin.

[0014] A PTFE-reinforced wear-resistant plastic composite pipe connector for tailings and slurry transportation is provided for connecting the aforementioned composite pipe, wherein the connecting end of the composite pipe is folded outward to form a flange; the connector includes a metal outer sleeve and a flange.

[0015] The longitudinal section of the metal outer sleeve is stepped, including a first ring with a small diameter and a second ring with a large diameter;

[0016] The flange is embedded inside the second ring portion; the flange is sleeved on the outside of the first ring portion or the second ring portion.

[0017] Furthermore, based on the aforementioned scheme, the end of the second ring portion away from the first ring portion is provided with a first retaining ring that folds inward; the first retaining ring protrudes from the end face of the folded edge, and a sealing ring is embedded in the first retaining ring, the thickness of the sealing ring being greater than or equal to the thickness of the retaining ring.

[0018] Furthermore, based on the aforementioned scheme, the flange is fitted onto the outside of the first ring portion.

[0019] Furthermore, based on the aforementioned scheme, when the flange is parallel to the composite pipe, the connector further includes a metal inner sleeve, which is disposed between the outer wall of the composite pipe and its flange.

[0020] Furthermore, based on the aforementioned scheme, the end face of the second ring portion away from the first ring portion is provided with a second retaining ring that folds outward, and the flange is sleeved on the outside of the second ring portion.

[0021] Furthermore, based on the aforementioned scheme, two adjacent flanges are locked together with bolts.

[0022] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0023] This application utilizes a core tube with a wear-resistant matrix layer formed by extrusion molding of modified PTFE material or co-extrusion with PE. The modified PTFE is extruded as the inner wear-resistant layer, providing the pipe with an ultra-low coefficient of friction and chemical corrosion resistance. High-strength steel wire, coated with adhesive resin, is continuously wound at a helical angle of 54°45′±2° and tightly bonded to the wear-resistant matrix layer through melt bonding, forming a high-pressure-bearing reinforced structure. By extruding composite PE or modified PTFE onto the outside of the pipe, environmental corrosion is prevented and UV resistance is improved. This structural design results in a composite pipe with excellent wear resistance, high impact resistance, corrosion resistance, and lightweight properties, solving the problems of wear, corrosion, and insufficient pressure bearing capacity in existing pipelines used for tailings and slurry transportation.

[0024] By folding the end of the composite pipe outward to form a flange, and then installing a stepped metal outer sleeve over the composite pipe and its flange, the clamped metal outer sleeve wraps around the flange, which significantly improves the pipe end's resistance to radial deformation and axial pull-out, making it particularly suitable for high-pressure or vibration environments. A flange is then fitted over the metal outer sleeve. During connection, adjacent flanges are bolted together. The metal outer sleeve and the flange share the bolt tightening force and media pressure, reducing local stress concentration in the pipe and preventing flange cracking. Furthermore, the flange design increases the stress-bearing area when mated with the flange, enabling it to withstand higher pressure and axial tension, while maintaining good sealing performance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of a PTFE-reinforced wear-resistant plastic composite pipe for tailings and slurry conveying according to an embodiment of this utility model.

[0027] Figure 2 This is a cross-sectional view of a PTFE-reinforced wear-resistant plastic composite pipe connector for tailings and slurry conveying according to an embodiment of the present invention.

[0028] Figure 3 This is a cross-sectional view of a PTFE-reinforced wear-resistant plastic composite pipe connector for tailings and slurry transportation according to another embodiment of the present invention.

[0029] Icons: 1-Composite pipe, 11-Wear-resistant base layer, 111-Inner wear-resistant layer, 112-Core pipe layer, 12-Reinforcing layer, 13-Outer protective layer, 14-Flanged edge, 2-Metal outer sleeve, 21-First ring, 22-Second ring, 23-First retaining ring, 24-Second retaining ring, 3-Flange, 4-Metal inner sleeve. Detailed Implementation

[0030] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] Please refer to Figure 1 The diagram shows the overall structure of a PTFE-reinforced wear-resistant plastic composite pipe used for tailings and slurry transportation.

[0032] This embodiment provides a PTFE-reinforced wear-resistant plastic composite pipe for tailings and slurry transportation, comprising a wear-resistant matrix layer 11, a reinforcing layer 12, and an outer protective layer 13 stacked sequentially from the inside out. The wear-resistant matrix layer 11 is formed by extrusion of modified PTFE or co-extrusion of modified PTFE / PE, wherein the modified PTFE extrusion forms the inner wear-resistant layer 111; the wear-resistant matrix layer 11 is formed by extrusion molding of modified polytetrafluoroethylene (PTFE) material, or by co-extrusion with polyethylene (PE), wherein PTFE is the inner wear-resistant layer 111 and PE is the core tube layer 112, thereby providing an ultra-low coefficient of friction and chemical corrosion resistance, and improving the wear resistance of the composite pipe 1. The aforementioned reinforcing layer 12 is formed by winding high-strength steel wire at a helical angle of 54°45′±2°. Specifically, high-strength steel wire (or steel tape) is coated with adhesive resin and then continuously wound at a helical angle of 54°45′ to optimize the ratio of axial to circumferential strength. It is tightly bonded to the wear-resistant matrix layer 11 through melt bonding, forming a high-pressure-bearing reinforced structure. This ensures good pressure resistance when transporting materials such as tailings and slurries, preventing deformation after long-term transportation and extending the service life of the pipe. The aforementioned outer protective layer 13 is formed by extrusion of PE or modified PTFE. The extruded composite PE or modified PTFE serves as the external protective layer of the pipe, preventing environmental corrosion and improving UV resistance, further enhancing the strength and lifespan of the pipe.

[0033] In a preferred embodiment, the modified PTFE contains 5%–10% nano-silicon carbide and 1%–3% graphene. Through the modified PTFE inner layer and nano-reinforcement, a gradient wear-resistant layer is formed by extrusion blending, resulting in a reduction of the friction coefficient by approximately 30% and an increase in wear resistance of more than two times, significantly enhancing the wear resistance of the pipe. It should be noted that the modified PTFE, nano-silicon carbide, and graphene are all known materials in the prior art. Their properties are utilized to form a wear-resistant layer in the pipe to enhance wear resistance; this is not an improvement on the materials themselves.

[0034] In a preferred embodiment, the surface of the reinforcing layer 12 is provided with a polyaramid fiber transition layer. Adding a plasma-activated polyaramid fiber transition layer between the steel wire and the resin layer improves the interlayer bonding strength and prevents delamination under high pressure.

[0035] Reference Figures 2-3This embodiment provides a PTFE-reinforced wear-resistant plastic composite pipe 1 connector for tailings and slurry transportation, used to connect the aforementioned composite pipe 1. The connecting end of the composite pipe 1 is heat-fused and folded outward to form a flange 14, which can be folded into a vertical composite pipe 1 or a parallel composite pipe 1. The connector includes a metal outer sleeve 2 and a flange 3. The longitudinal section of the metal outer sleeve 2 is stepped, including a small-diameter first ring portion 21 and a large-diameter second ring portion 22. Since the diameter of the end of the composite pipe 1 increases after the flange 14, the flange 14 is embedded inside the second ring portion 22. The crimped metal outer sleeve 2 wraps around the flange 14 portion, which can significantly improve the pipe end's resistance to radial deformation and axial pull-out, especially suitable for high-pressure or vibration environments. The flange 3 is sleeved on the outside of the first ring portion 21 or the second ring portion 22. After the flange 3 is locked between the pipes with bolts, the flange 3 is locked using the tightening force of the bolts. The metal outer sleeve 2 and the flange 14 share the bolt tightening force and medium pressure, which can reduce local stress concentration in the pipe and prevent the flange 14 from cracking. Moreover, the design of the flange 14 increases the force-bearing area when it is matched with the flange 3, which can withstand higher pressure and axial tension, and has good sealing performance.

[0036] like Figure 2 In a preferred embodiment, the end of the second ring portion 22 furthest from the first ring portion 21 is provided with a first retaining ring 23 folded inward. The first retaining ring 23 protrudes from the end face of the flange 14, and a sealing ring is embedded in the first retaining ring 23. The thickness of the sealing ring is greater than or equal to the thickness of the retaining ring. By folding the end face of the second ring portion 22, a first retaining ring 23 capable of accommodating a sealing ring or gasket is formed. During connection, the first retaining rings 23 of two adjacent connectors face each other, causing the sealing rings inside the retaining rings to abut against each other, forming a seal at the pipe connection, thereby improving the sealing performance.

[0037] Furthermore, the flange 3 is fitted outside the first ring 21. Since the first retaining ring 23 of the second ring 22 is bent inward, it cannot limit the flange 3. Therefore, fixing the flange 3 outside the first ring 21 makes it less likely to shift.

[0038] like Figure 3 In a preferred embodiment, when the flange 14 is parallel to the composite pipe 1, the connector also includes a metal inner sleeve 4, which is disposed between the outer wall of the composite pipe 1 and the flange 14. During installation, the metal inner sleeve 4 is first fitted onto the outside of the pipe, then the flange 14 is bent and pressed tightly between the flange 14 and the outer wall of the pipe. After the flange 14 is folded, a metal outer sleeve 2 is fitted onto the outside of the flange 14. The metal outer sleeve 2 with flange 3 is fastened by a hydraulic device. The metal inner sleeve 4 and the metal outer sleeve 2 use the prestress of metal deformation to lock the pipe structure layer. Finally, the flanges 3 of the two pipes are tightened by bolts, which can improve the connection strength between the pipes.

[0039] Furthermore, the end face of the second ring portion 22 away from the first ring portion 21 is provided with a second retaining ring 24 folded outwards, and the flange 3 is fitted onto the outside of the second ring portion 22. It should be noted that, since the metal outer sleeve 2 needs to cooperate with the metal inner sleeve 4 to lock the pipe, the flange 3 is located on the outside of the second ring portion 22. To prevent the flange 3 from detaching or shifting, the end of the second ring portion 22 is folded outwards to form the second retaining ring 24, which can limit and fix the flange 3.

[0040] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0041] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A PTFE reinforced wear resistant plastic composite pipe for tailings and slurry transportation, characterized by, The wear-resistant base layer, the reinforcing layer and the outer protective layer are sequentially stacked from inside to outside, The wear-resistant base layer is formed by modified PTFE extrusion or modified PTFE / PE co-extrusion, wherein the modified PTFE extrusion is an inner wear-resistant layer; The reinforcing layer is formed by winding high-strength steel wires at a spiral angle of 54°45'±2°; The outer protective layer is formed by PE or modified PTFE extrusion.

2. The PTFE reinforced wear resistant plastic composite pipe for tailings and slurry transportation according to claim 1, characterized in that, The modified PTFE is mixed with 5%-10% nanometer silicon carbide and 1%-3% graphene.

3. The PTFE reinforced wear resistant plastic composite pipe for tailings and slurry transportation as claimed in claim 1 wherein, The reinforcing layer is provided with a polyaramid fiber transition layer on the surface.

4. The PTFE reinforced wear resistant plastic composite pipe for tailings and slurry transportation as claimed in claim 1 wherein, The wear-resistant base layer and the reinforcing layer are fused by adhesive resin.

5. A PTFE reinforced wear plastic composite pipe coupling for tailings and slurry transportation, characterized in that, The connecting piece comprises a metal outer sleeve and a flange plate, The longitudinal section of the metal outer sleeve is in a stepped shape, comprising a first ring part with a small diameter and a second ring part with a large diameter; The flange is embedded in the inner side of the second ring part, and the flange plate is sleeved on the outer side of the first ring part or the second ring part.

6. The PTFE reinforced wear plastic composite pipe coupling for tailings and slurry transportation as claimed in claim 5 wherein, The end of the second ring part away from the first ring part is provided with a first blocking ring folded towards the inner side; the first blocking ring protrudes from the end surface of the flange, and a sealing ring is embedded in the first blocking ring, and the thickness of the sealing ring is greater than or equal to the thickness of the blocking ring.

7. The PTFE reinforced wear plastic composite pipe coupling for tailings and slurry transportation as claimed in claim 6 wherein, The flange plate is sleeved on the outer side of the first ring part.

8. The PTFE reinforced wear plastic composite pipe coupling for tailings and slurry transportation as claimed in claim 5 wherein, When the flange is parallel to the composite pipe, the connecting piece further comprises a metal inner sleeve, which is arranged between the outer wall of the composite pipe and the flange thereof.

9. The PTFE reinforced abrasion resistant plastic composite pipe coupling for tailings and slurry transportation as claimed in claim 8 wherein, The end surface of the second ring part away from the first ring part is provided with a second blocking ring folded towards the outer side, and the flange plate is sleeved on the outer side of the second ring part.

10. The PTFE reinforced abrasion resistant plastic composite pipe coupling for tailings and slurry transportation as claimed in claim 5 wherein, Two adjacent flange plates are locked by bolts.

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