Composite pipe riveting connection device and preparation method and application thereof

Abstract

The present invention discloses a composite pipe riveting connection device, a preparation method and an application, and is characterized in that the composite pipe body comprises an inner layer of plastic, a special hot-melt adhesive layer, a wrapped steel wire mesh layer and an outer layer of plastic, and the end of the composite pipe body is provided with a "T"-shaped outward-turned structure; the two composite pipe bodies are riveted to the wrapped steel wire mesh layer of the pipe through the connecting piece and two high-strength riveting retaining rings, and the two high-strength riveting retaining rings are fixedly connected through the connecting piece; the beneficial effect of the present invention is that the wrapped steel wire mesh layer at the connection of the steel wire mesh skeleton plastic composite pipe can be effectively riveted and deformed and fixed, which solves the problem that the current connection method cannot effectively control the wrapped steel wire mesh layer, and avoids the risk of the steel wire mesh skeleton plastic composite pipe end connection being pulled out and the head being disconnected.

Description

Technical field:

[0002] The invention belongs to the technical field of steel wire mesh skeleton plastic composite pipe connection structure, and more specifically relates to a composite pipe riveting connection device, a preparation method and an application thereof. Background technology:

[0004] The wire mesh skeleton plastic composite pipe has been favored by the pipeline engineering industry for its excellent performance. It is now known that the registered enterprise standard Q / 0881DHB008-2018 stipulates that the pipe can withstand a nominal pressure of 7.0Mpa; the existing connection methods of wire mesh skeleton plastic composite pipes include electric fusion sleeve connection, hot-melt butt welding plus capacitor sleeve connection, electric fusion flange connection, hot-melt socket flange connection, press flange connection, and press clamp connection.

[0005] The coexistence of these connection methods is characterized by a low working pressure of ≤3.5Mpa, which cannot match the maximum pressure-bearing capacity of the existing wire mesh skeleton plastic composite pipe. The reason is that the steel wire layer at the connection cannot be completely isolated from the working liquid, especially in mountainous areas where the terrain height difference of water supply is large. The pipelines laid on the slope surface are affected by the conveyed liquid and their own weight during operation. When subjected to high pressure, it is easy to cause water leakage from the steel wire layer and the connection to be pulled out, which eventually causes the pipeline to be damaged and fail.

[0006] The national invention patent with patent number 201710820772.3 discloses a wire mesh skeleton plastic composite pipe joint structure and a joint structure manufacturing method, which is provided with a wire mesh skeleton plastic composite pipe joint structure, the end face of the joint connection part has an annular flange receiving groove, and the side of the flange receiving groove has an annular lap sealing groove; the end of the wire mesh skeleton plastic composite pipe has an annular flange folded outward; the pipe fitting sleeve is sleeved on the wire mesh skeleton plastic composite pipe, the annular flange is located in the flange receiving groove, and the outer edge of the inner pipe in the annular flange is embedded in the lap sealing groove. The joint structure ensures the connection strength between the joint seat and the wire mesh skeleton plastic composite pipe by embedding the outer edge of the inner pipe in the lap sealing groove, avoiding the joint falling off.

[0007] Although the device utilizes a stable joint structure, the design of the joint structure can only realize that the PE layer at the outer edge of the pipe end flange is embedded in the sealing groove, while the steel wire layer in the middle of the pipe is not effectively controlled. When the steel wire mesh skeleton plastic composite pipe is subjected to working pressure, it will frequently alternately expand and contract. Although the structure uses flanges and bolts for external connection and fixation, the expansion and contraction of the pipe wall will still cause the steel wire layer inside the pipe to move back and forth in the pipe wall. Since the steel wire layer is only a flange and is not effectively fixed, the pipe end flange will be pulled out of the retaining ring over time.

[0008] The national invention patent with the patent number of 201811461225.1 discloses a connection structure of a steel wire mesh skeleton plastic composite pipe. The device is modified on the basis of the previous patent. The connection structure includes a third gasket arranged between the annular flanges in the two steel wire mesh skeleton plastic composite pipes. The third gasket and the end face of the inner pipe in the annular flange are fixedly connected by melting and cooling, so that the outer sides of the two flanges are connected together by hot melting. Compared with the flange structure in the national invention patent of 201710820772.3, it is an independent structure and has improved stability.

[0009] However, the problem is still not substantially solved, because the thermal expansion and contraction of the steel wire skeleton structure is quite different from that of the outer plastic layer, but as the use time increases, the flange will still be pulled out of the retaining ring of the joint structure. Summary of the invention:

[0011] In order to solve the above problems and overcome the shortcomings of the prior art, the present invention provides a high-pressure and high-strength riveting connection method for a wire mesh skeleton plastic composite pipe, which truly solves the quality problems such as water leakage and pull-out caused by the movement of the steel wire layer.

[0012] The specific technical solution of the present invention to solve the above technical problems is: a composite pipe riveting connection device, comprising a composite pipe body, a high-strength riveting retaining ring and a connecting piece, characterized in that the composite pipe body comprises an inner layer of plastic, a special hot melt adhesive layer, a winding steel wire mesh layer and an outer layer of plastic, and the end of the composite pipe body is provided with a "T"-shaped outward-turned structure;

[0013] The two composite pipe bodies rivet the wrapped steel wire mesh layers of the pipes through the connecting piece and two high-strength riveted retaining rings, and the two high-strength riveted retaining rings are fixedly connected through the connecting piece.

[0014] Furthermore, the high-strength riveted retaining ring is a circular ring structure made of metal, which is arranged on the outside of the "T"-shaped outward-turned structure, including a buckling section, a necking section, an inward-turned covering section and a riveted section. Buckling inverted teeth are arranged inside the buckling section, which are buckled on the pipe body after necking deformation to achieve the connection between the high-strength riveted retaining ring and the outer plastic layer of the pipe; the necking section and the inward-turned covering section are wrapped on the outside of the "T"-shaped outward-turned structure, and the "T"-shaped outward-turned structure is deformed by necking and inward-turned covering under pressure. The structure and the internal wound steel mesh layer are wrapped in an arc shape; the riveted section is an inner layer of plastic embedded in the "T"-shaped outward-turned structure of the pipe end, and the wound steel mesh layer is pressed and riveted, and continued pressure is applied to cause the end of the riveted section to be embedded in the wound steel mesh layer for high-strength riveting. After riveting, the wound steel mesh layer presents a "U"-shaped structure, and the end of the retaining ring is embedded in the deformed "U"-shaped structure of the wound steel mesh layer to effectively fix the wound steel mesh layer, thereby preventing the wound steel mesh layer from being pulled out.

[0015] Furthermore, the connecting piece includes a sealing structure and a connecting structure.

[0016] Furthermore, the sealing structure is a rubber sealing gasket or an electric hot-melt sealing gasket.

[0017] Furthermore, the connecting piece is any one of a bolt connection, a snap connection, a clamp connection, a winding connection or a cage connection.

[0018] A method for preparing a composite pipe riveting connection device, characterized in that after the high-strength riveting retaining ring is plastically deformed, a steel wire mesh layer is wound inside the pipe body to effectively press and fix it, and the preparation process includes: a buckling step, a necking step, an inward-turning and covering step, and a high-strength riveting step;

[0019] ⅠCrimp step: Use a crimping die to shrink and deform the crimping section of the high-strength riveted retaining ring, and reduce the diameter of the crimping inverted teeth in the retaining ring to crimp and fix the pipe;

[0020] Ⅱ Shrinking step: Use a riveting die to apply pressure to the high-strength riveting retaining ring. The straight edge of the outer edge of the high-strength riveting retaining ring shrinks and deforms under the action of the riveting die cavity, and the "T"-shaped outward-turned structure is shrunken and fixed;

[0021] III. Inward turning and covering step: the riveting die continues to apply pressure to the high-strength riveted retaining ring, and the shrinking section of the high-strength riveted retaining ring is deformed and inward turned and covered under the pressure, so that the "T"-shaped outward turning structure is covered in an arc shape;

[0022] IV High-strength riveting step: The riveting mold continuously applies pressure to the high-strength riveting retaining ring, and the end of the inward-turned covering section of the high-strength riveted retaining ring is deformed and embedded in the plastic inner layer of the "T"-shaped outward-turned structure, and the wrapped wire mesh layer is pressed and deformed into a "U"-shaped structure. At this time, the end of the riveted section of the retaining ring has been embedded in the "U"-shaped structure after the deformation of the wrapped wire mesh layer in the "T"-shaped outward-turned structure, and the "T"-shaped outward-turned structure and the internal wrapped wire mesh layer are riveted with high strength.

[0023] Furthermore, the riveting die is a circular ring structure, and an inner concave die cavity is arranged inside, and the die cavity is an inner arc surface processed on the end face of the circular ring structure.

[0024] Furthermore, the "T"-shaped outward-turned structure is formed by flanging the tube end by heating or deforming it at room temperature.

[0025] Furthermore, the room temperature processing deformation adopts a top pressure flattening mold, and the top pressure flattening mold is an independent integrated mold structure. The top pressure flattening mold includes a positioning structure, a top pressure flattening structure and an inner support structure.

[0026] A composite pipe riveting connection device is characterized in that it is used for connecting steel mesh skeleton plastic composite pipes, and connecting steel mesh skeleton plastic composite pipes with valves, tees, and elbows. It is a high-pressure, high-strength connection method.

[0027] The beneficial effects of the present invention are that the wrapped steel wire mesh layer at the connection of the steel wire mesh skeleton plastic composite pipe can be effectively riveted and deformed, solving the problem that the current connection method cannot effectively control the wrapped steel wire mesh layer, and avoiding the risk of the steel wire mesh skeleton plastic composite pipe end connection being pulled off. Description of the drawings:

[0029] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Attached Figure 2 It is a schematic diagram of a fixed-length die and a crimping die of the present invention;

[0031] Attached Figure 3 It is a schematic diagram of the fixed-length crimping process of the present invention;

[0032] Attached Figure 4 It is a schematic diagram of the expansion die and processing process of the present invention;

[0033] Attached Figure 5 It is a schematic diagram of the structural state of the pipe end after expansion of the present invention;

[0034] Attached Figure 6 It is a schematic diagram of the processing process of the top pressing and leveling mold of the present invention;

[0035] Attached Figure 7 This is a schematic diagram of the use process of the top pressure leveling mold of the present invention;

[0036] Attached Figure 8 It is a schematic diagram of the initial state of the riveting die and the riveting process of the present invention;

[0037] Attached Fig. 9 It is a schematic diagram of the riveting die and the riveting process of the present invention;

[0038] Attached Fig.10 Schematic diagram of the riveting connection device of the present invention; in the accompanying drawings:

[0039] In the figure: 1. Composite pipe body; 2. "T"-shaped outward-turned structure; 3. High-strength riveted retaining ring; 4. Rubber sealing gasket 4; 5. Flange; 6. Fastening bolts; 7. Fastening nuts; 8. Fixed-length mold; 9. Crimping mold; 10. Expanding mold; 11. Pressing and leveling mold; 12. Riveting mold; 13. Crimping section; 14. Shrinking section; 15. Inward-turned covering section; 16. Riveting section. Specific implementation method:

[0041] In the description of the present invention, specific details are only for a full understanding of the embodiments of the present invention, but those skilled in the art should know that the implementation of the present invention is not limited to these details. In addition, well-known structures and functions are not described or shown in detail to avoid blurring the key points of the embodiments of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] A method for preparing a composite pipe riveting connection device, comprising: a buckling step, a necking step, an inward-turning and covering step, and a high-strength riveting step;

[0043] 1. The buckling step includes using a buckling die 9 to shrink and deform the buckling section 13 of the high-strength riveted retaining ring 3, and the buckling undercut hole diameter in the retaining ring is reduced to buckle and fix the pipe;

[0044] 2. The shrinking step includes applying pressure to the high-strength riveting retaining ring 3 using a riveting mold 12, and the outer straight edge of the high-strength riveting retaining ring 3 is shrunken and deformed under the action of the mold cavity of the riveting mold 12, so that the "T"-shaped outward-turned structure 2 is shrunken and fixed;

[0045] 3. The inward-turning and covering step includes using the riveting die 12 to continue to apply pressure to the high-strength riveted retaining ring 3, and the constricted section 14 of the high-strength riveted retaining ring 3 is deformed and inward-turned and covered under the pressure, so that the "T"-shaped outward-turned structure 2 is covered in an arc shape;

[0046] 4. The high-strength riveting step includes using the riveting mold 12 to continue to apply pressure to the high-strength riveted retaining ring 3, and the end of the inward-turned covering section 15 of the high-strength riveted retaining ring 3 is deformed and embedded in the "T"-shaped outward-turned structure 2, and the wrapped steel wire mesh layer is pressed and deformed into a "U"-shaped structure. At this time, the end of the retaining ring riveting section 16 has been embedded in the "U"-shaped structure after the deformation of the wrapped steel wire mesh layer inside the "T"-shaped outward-turned structure 2, and the "T"-shaped outward-turned structure 2 and the internal wrapped steel wire mesh layer are riveted with high strength.

[0047] The riveting die 12 is a circular ring structure, and an inner concave die cavity is arranged inside. The die cavity structure is an inner arc surface processed on the end surface of the circular ring structure.

[0048] In order to more intuitively demonstrate the advantages of the high-strength riveting connection of the present invention, a further detailed description is given: Specific embodiment 1:

[0050] 1. The "T"-shaped outward-turned structure 2 is prepared by a normal temperature processing deformation process using a flaring die 10 and a top pressing and flattening die 11;

[0051] 2. The "T"-shaped outward-turned structures 2 of the two composite pipe bodies 1 are plastically deformed by high-strength riveting retaining rings, and the "T"-shaped outward-turned structures at the pipe ends and the internally wound steel wire mesh layer are riveted;

[0052] 3. The riveted connection device is connected and fixed by a connection member configured as a bolt, and is sealed by a rubber sealing gasket 4; Specific embodiment 2:

[0054] 1. The "T"-shaped outward-turned structure 2 is prepared by a conventional high-temperature processing deformation process;

[0055] 2. The "T"-shaped outward-turned structures 2 of the two composite pipe bodies 1 are riveted to the wrapped steel wire mesh layer of the pipe through a high-strength riveting ring.

[0056] 3. The riveted connection device is connected and fixed by a connection member configured as a bolt, and is sealed by a rubber sealing gasket 4; Specific embodiment 3:

[0058] 1. The "T"-shaped outward-turned structure 2 is prepared by a top-pressing and flattening mold 11 through a normal temperature processing deformation process;

[0059] 2. The "T"-shaped outward-turned structures 2 of the two composite pipe bodies 1 are plastically deformed by high-strength riveting retaining rings, and the "T"-shaped outward-turned structures at the pipe ends and the internally wound steel wire mesh layer are riveted;

[0060] 3. The riveted connection device is connected and fixed by a connection piece configured as a bolt, and sealed by hot melting; Specific embodiment 4:

[0062] 1. The "T"-shaped outward-turned structure 2 is prepared by a top-pressing and flattening mold 11 through a normal temperature processing deformation process;

[0063] 2. The "T"-shaped outward-turned structures 2 of the two composite pipe bodies 1 are plastically deformed by high-strength riveting retaining rings, and the "T"-shaped outward-turned structures at the pipe ends and the internally wound steel wire mesh layer are riveted;

[0064] 3. The riveted connection device is connected and fixed by a connection piece configured as a clamp, and is sealed by hot melting.

[0065] The specific steps are as follows: Specific embodiment 1:

[0067] A wire mesh skeleton plastic composite pipe riveting connection device comprises a wire mesh skeleton plastic composite pipe body 1, a high-strength riveting retaining ring 3 and a connecting piece, wherein the composite pipe body 1 comprises an inner layer of plastic, a special hot melt adhesive layer, a winding wire mesh layer and an outer layer of plastic, and a "T"-shaped outward-turned structure 2 is arranged at the end of the composite pipe body 1;

[0068] The "T"-shaped outward-turned structure 2 of the two composite pipe bodies 1 is plastically deformed by a high-strength riveting retaining ring, and the "T"-shaped outward-turned structure of the pipe end and the internally wound wire mesh layer are riveted, and the two pipe bodies are fixedly connected by the connecting piece;

[0069] The high-strength riveted retaining ring 3 is a metal structure, which is arranged on the outside of the "T"-shaped outward-turned structure 2, and includes a buckling section 13, a necking section 14, an inward-turned covering section 15 and a riveted section 16. The necking section 14 is wrapped around the outside of the "T"-shaped outward-turned structure, and is deformed by necking and inward-turned under pressure to cover the "T"-shaped outward-turned structure in an arc shape. The riveted section 16 is embedded in the steel wire layer that is deformed into a "U"-shaped structure by applying force, and is fixed by riveting connection.

[0070] The connecting piece comprises a sealing structure and a connecting structure; the sealing structure is a rubber sealing pad 4, and the connecting piece is a bolt connection.

[0071] The "T"-shaped outward-turned structure 2 is prepared by flanging the flaring die 10 and the top-pressing and flattening die 11 at room temperature without heating. The flaring die 10 and the top-pressing and flattening die 11 are both independent integrated structures, the flaring die 10 is a conical structure, and the top-pressing and flattening die 11 is a composite structure of multiple cylinders arranged along the axial direction.

[0072] The specific steps include: firstly, assembling the steel wire mesh skeleton plastic composite pipe 1 to be processed with the high-strength riveted retaining ring 3, placing them in the buckling mold 9, and using the fixed-length mold 8 to limit the protruding size of the pipe end, using the hydraulic press to press the buckling mold 9, so that the buckling section 13 of the high-strength riveted retaining ring is shrunken and deformed, and the buckling inverted tooth aperture in the retaining ring is reduced to buckle and fix the pipe. The process is as follows: Figure 4 , and get Figure 5 structure;

[0073] Then, the expansion die 10 is used to expand the fixed-length pipe end after buckling into a bell-mouth shape. The process is as follows. Figure 4 , and get Figure 5 structure;

[0074] Finally, the expanded pipe end is flattened in a "T" shape by using the top pressing and flattening die 11. The process is as follows Figure 6 , and get Figure 7 structure;

[0075] The high-strength riveted structure is prepared by applying pressure to the high-strength riveted retaining ring using a riveting mold 12, causing the high-strength riveted retaining ring to deform, and wrapping and riveting the "T"-shaped outward-turned structure 2. The riveting mold 12 is an integrated mold cavity structure, and the high-strength riveted retaining ring 3 is a metal ring structure, which is arranged on the outside of the "T"-shaped outward-turned structure 2.

[0076] The specific steps include: using a riveting die 12 to apply pressure to the buckling retaining ring 3, so that the outer edge straight edge of the high-strength riveted retaining ring 3, under the action of the riveting die cavity, successively undergoes a buckling step, a shrinking step, an inward-turning and covering step, and a high-strength riveting step, so that the end of the high-strength riveted retaining ring is deformed and embedded in the "T"-shaped outward-turning structure 2, and the winding wire mesh layer is deformed into a "U" shape by top pressure for high-strength riveting. The process is as follows Figure 8 , Fig. 9 Finally, the high-strength riveting connection device is manufactured, and the following is obtained: Fig.10 structure.

[0077] The high-strength riveting connection device can be used for the connection between wire mesh skeleton plastic composite pipes, and the connection between wire mesh skeleton plastic composite pipes and valves, tees, and elbows. Specific embodiment 2:

[0079] The same as Example 1, except that the "normal temperature processing deformation method" of the "T"-shaped outward-turned structure 2 in Example 1 is replaced by a high temperature processing deformation method; Specific embodiment 3:

[0081] Same as Example 1, except that the "sealing structure is a rubber sealing pad 4" in Example 1 is replaced by a hot melt connection;

[0082] The specific steps of hot melt connection are:

[0083] The same as Example 1, except that the sealing rubber ring in the sealing structure in Example 1 is changed to a hot melt connection method. The hot melt connection method is to place an electric thermal fuse or an electric hot melt adhesive pad between the end faces of the two composite pipe bodies 1. After the two pipes are connected, heat is generated by energizing the electric thermal fuse, causing the two end faces of the pipe to be hot-melted together to achieve a hot melt sealing effect. Specific embodiment 4:

[0085] Same as Example 3, except that the "bolt connection" in Example 3 is replaced by a clamp connection;

[0086] It can be clearly seen from the above embodiments that although the devices described in Patent No. 201710820772.3 and Patent No. 201811461225.1 utilize a stable joint structure, the design of the joint structure can only realize that the PE layer at the outer edge of the pipe end flange is embedded in the sealing groove, while the wrapped wire mesh layer in the middle of the pipe is not effectively controlled. When the wire mesh skeleton plastic composite pipe is under working pressure, it will frequently alternately expand and contract. Although the structure uses flanges and bolts for external connection and fixation, the expansion and contraction of the pipe wall will still cause the wrapped wire mesh layer inside the pipe to move back and forth in the pipe wall. Since the wrapped wire mesh layer is only a flange and is not effectively fixed, the pipe end flange will be pulled out of the retaining ring over time.

[0087] To sum up: the present invention uses a high-strength riveting connection structure to effectively rivet the wrapped steel wire mesh layer at the connection of the steel wire mesh skeleton plastic composite pipe, perfectly realizing the effective fixation of the outer wall of the pipe, the "T"-shaped outward-turned structure of the pipe end and the internal wrapped steel wire mesh layer, so that when the pipe is subjected to working pressure and frequent expansion and contraction, the wrapped steel wire mesh layer will not move back and forth inside the pipe wall, thereby solving the problem that the current connection method cannot effectively control the wrapped steel wire mesh layer, and avoiding the risk of the wire mesh skeleton plastic composite pipe end connection being pulled off.

Claims

1. A composite pipe riveting connection device, comprising a composite pipe body, a high-strength riveting retaining ring and a connecting piece, characterized in that The composite pipe body comprises an inner layer of plastic, a special hot melt adhesive layer, a winding wire mesh layer and an outer layer of plastic, and the end of the composite pipe body is provided with a "T"-shaped outward-turned structure; The two composite pipe bodies are fixedly connected to two high-strength riveted retaining rings through the connecting piece; The "T"-shaped outward-turned structures of the two composite pipe bodies rivet the wrapped steel wire mesh layer of the pipe through a high-strength riveting retaining ring, and the two high-strength riveting retaining rings are fixedly connected through the connecting piece; The high-strength riveted retaining ring is a circular ring structure made of metal, which is arranged on the outside of the "T"-shaped outward-turned structure, and includes a buckling section, a necking section, an inward-turned covering section and a riveting section. The buckling section is provided with buckling inverted teeth that are buckled on the pipe body after being deformed by necking to achieve the connection between the high-strength riveted retaining ring and the outer plastic layer of the pipe; the necking section and the inward-turned covering section are wrapped on the outside of the "T"-shaped outward-turned structure; the riveting section is configured to be embedded in the inner plastic layer of the "T"-shaped outward-turned structure at the pipe end, and the wrapped steel wire mesh layer is pressed and riveted.

2. The composite pipe riveting connection device according to claim 1, characterized in that The connecting piece comprises a sealing structure and a connecting structure.

3. The composite pipe riveting connection device according to claim 2, characterized in that The sealing structure is a rubber sealing pad.

4. The composite pipe riveting connection device according to claim 2, characterized in that The connecting piece is any one of a bolt connection, a snap connection, a clamp connection, a winding connection or a cage connection.

5. A method for preparing the composite pipe riveting connection device according to claim 1, characterized in that After the riveting retaining ring is plastically deformed, the steel wire mesh layer is wrapped inside the pipe body for effective pressing and fixing. The preparation process includes: a buckling step, a necking step, an inward-turning and covering step, and a high-strength riveting step; ⅠCrimp step: Use a crimping die to shrink and deform the crimping section of the riveted retaining ring, and reduce the diameter of the crimping undercut in the retaining ring to crimp and fix the pipe; Ⅱ Shrinking step: Use a riveting die to apply pressure to the high-strength riveting retaining ring. The straight edge of the outer edge of the high-strength riveting retaining ring shrinks and deforms under the action of the riveting die cavity, and the "T"-shaped outward-turned structure is shrunken and fixed; III. Inward turning and covering step: the riveting die continues to apply pressure to the high-strength riveted retaining ring, and the shrinking section of the high-strength riveted retaining ring is deformed and inward turned and covered under the pressure, so that the "T"-shaped outward turning structure is covered in an arc shape; IV High-strength riveting step: The riveting mold continuously applies pressure to the high-strength riveting retaining ring, and the end of the inward-turned covering section of the high-strength riveted retaining ring is deformed and embedded in the plastic inner layer of the "T"-shaped outward-turned structure, and the wrapped wire mesh layer is pressed and deformed into a "U"-shaped structure. At this time, the end of the riveted section of the retaining ring has been embedded in the "U"-shaped structure after the deformation of the wrapped wire mesh layer in the "T"-shaped outward-turned structure, and the "T"-shaped outward-turned structure and the internal wrapped wire mesh layer are riveted with high strength.

6. The method for preparing the composite pipe riveting connection device according to claim 5, characterized in that The riveting die is a circular ring structure, and an inner concave die cavity is arranged inside, and the die cavity is an inner arc surface processed on the end face of the circular ring structure.

7. The method for preparing a composite pipe riveting connection device according to any one of claims 5 to 6, characterized in that The "T"-shaped outward-turned structure is formed by flanging the pipe end by heating or deforming at room temperature.

8. The method for preparing the composite pipe riveting connection device according to claim 7, characterized in that The room temperature processing deformation adopts a top pressure flattening mold, and the top pressure flattening mold is an independent integrated mold structure. The top pressure flattening mold includes a positioning structure, a top pressure flattening structure and an inner support structure.

9. A composite pipe riveting connection device according to any one of claims 1 to 4, characterized in that Used for connecting wire mesh wrapped plastic composite pipes, and for connecting wire mesh wrapped plastic composite pipes with valves, tees and elbows.

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