Pipe machining method for enhancing deformation resistance and pipe

Abstract

The invention discloses a processing method of a pipe capable of enhancing deformation resistance and the pipe. The processing method comprises the following steps: preparing an HDPE (High-Density Polyethylene) matrix layer raw material, preparing a glass fiber reinforcing rib and preparing a flame-retardant silicon core layer raw material; raw materials of the HDPE base body layer and raw materials of the flame-retardant silicon core layer are added into a double-screw extruder to be subjected to double-layer co-extrusion to form the HDPE base body layer and the flame-retardant silicon core layer of the pipe, the flame-retardant silicon core layer is an inner layer, the HDPE base body layer is an outer layer, glass fiber reinforcing ribs penetrate into an extrusion die to form spiral glass fiber reinforcing ribs in the double-layer co-extrusion process, and the spiral glass fiber reinforcing ribs are extruded into the flame-retardant silicon core layer to form the pipe. The spiral glass fiber reinforcing ribs are positioned in the HDPE base body layer; cooling and shaping the extruded pipe; the pipe is cut according to the needed length and then fed into an injection mold, the two ends of the pipe are connected with the injection mold, and buckle type connectors are formed at the two ends of the pipe in an injection molding mode. The out-of-roundness after the pipe is wound is obviously reduced, stress is evenly dispersed through the spiral reinforcing ribs, the compressive strength of the pipe is improved, and it is ensured that the friction coefficient of a silicon core layer is even; and the pulling resistance of the cable is reduced.

Description

Technical Field

[0001] This invention relates to the field of communication pipeline materials technology, and more specifically, to a method for processing pipes with enhanced resistance to deformation and the pipes themselves. Background Technology

[0002] In existing technologies, the scenarios for laying underground optical cables are becoming increasingly complex, including high-pressure environments under urban roads and high-temperature, short-circuit-risk scenarios near power facilities. Simultaneously, the demands for construction efficiency are constantly increasing. However, existing conventional HDPE silicon core pipes have gradually revealed several compatibility defects in practical applications: Firstly, insufficient deformation resistance. Due to the simple pipe structure, deformation easily occurs during production, winding, storage, transportation, and on-site laying, with non-roundness typically reaching 3%-5%. This leads to uneven stress on the inner silicon core layer, fluctuations in the coefficient of friction, severely affecting the efficiency of cable pulling and increasing construction difficulty; Secondly, flame retardancy... Firstly, standard HDPE silicon core pipes lack flame-retardant components. In scenarios where they are laid near power cables, if a short circuit occurs or the external high temperature environment occurs, the pipes are prone to combustion and release toxic fumes, which can not only damage the internal optical cables but also cause secondary safety accidents. Secondly, the connection method is cumbersome. Existing silicon core pipes mainly use electrofusion connection, which requires special electrofusion equipment and professional operators. Moreover, the connection process requires waiting for the fusion to cool down, and a single joint connection can take up to 30 minutes, which seriously restricts the construction progress. This defect is even more prominent in scenarios with high time requirements, such as emergency communication repair. Therefore, a technical solution is needed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art, reduce the non-roundness of the pipe after winding, improve the compressive strength of the pipe, ensure a decrease in cable pulling resistance, and provide a pipe processing method and pipe with enhanced resistance to deformation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention discloses a method for processing pipes with enhanced resistance to deformation, comprising the following steps:

[0006] S1. Prepare HDPE matrix layer raw materials, prepare glass fiber reinforcing ribs, and prepare flame-retardant silicon core layer raw materials;

[0007] S2. HDPE matrix layer raw material and flame-retardant silicon core layer raw material are added to a twin-screw extruder for double-layer co-extrusion to form HDPE matrix layer and flame-retardant silicon core layer of pipe. The flame-retardant silicon core layer is the inner layer and HDPE matrix layer is the outer layer. During the double-layer co-extrusion process, glass fiber reinforcing ribs are inserted into the extrusion die to form spiral glass fiber reinforcing ribs. The spiral glass fiber reinforcing ribs are located inside the HDPE matrix layer.

[0008] S3. Extruded tubing is cooled and shaped;

[0009] S4. Cut the pipe to the required length and send it into the injection mold. Connect the injection molds at both ends of the pipe and injection mold the ends of the pipe to form snap-fit ​​connectors.

[0010] Furthermore, in step S1, HDPE resin and polydopamine compatibilizer are mixed evenly to form HDPE matrix layer raw material, HDPE resin and glass fiber are mixed evenly and extruded through an extruder to obtain continuous glass fiber reinforcement, and silicone masterbatch, starch or silica, and phosphazene are mixed evenly to form flame retardant silicone core layer raw material.

[0011] Furthermore, in step S2, the die of the twin-screw extruder is preheated. Before extruding the HDPE matrix layer and the flame-retardant silicon core layer, the glass fiber reinforcing ribs are inserted into the extrusion die and formed into a spiral glass fiber reinforcing rib through the spiral channel in the extrusion die, so that the spiral reinforcing ribs at least partially extend out of the spiral channel.

[0012] Furthermore, in step S2, the extrusion mold includes a mandrel, a first outer mold, and a second outer mold. The mandrel includes an extrusion section that passes through the first and second outer molds. A first flow channel is formed between the mandrel and the first outer mold, and the first flow channel is used for the flow of flame-retardant silicon core layer raw materials. The second outer mold is fixedly installed on the first outer mold. A second flow channel is formed between the mandrel, the first outer mold, and the second outer mold, and the second flow channel is used for the flow of HDPE matrix layer raw materials.

[0013] Furthermore, a first extrusion channel is formed between the first outer mold and the extrusion section, and a second extrusion channel is formed between the second outer mold and the extrusion section. The second extrusion channel is located at the extrusion end of the first extrusion channel, and the diameter of the second extrusion channel is larger than the diameter of the first extrusion channel.

[0014] Furthermore, the first outer mold includes a mold body and a mold sleeve. The mold sleeve is installed at one end of the mold body corresponding to the extrusion section. The mold sleeve includes a tube. The mold body includes an installation groove. The tube is installed in the installation groove. The inner wall of the installation groove is provided with a first spiral groove. The outer wall of the installation groove is provided with a second spiral groove corresponding to the first spiral groove. The first spiral groove and the second spiral groove correspond to form the spiral channel.

[0015] Furthermore, the first outer mold includes an insertion channel, which connects the spiral channel and the outer side wall of the first outer mold. The insertion channel also connects to the inner end of the spiral channel. The fiberglass reinforcing rib is pushed into the spiral channel from the outside through the insertion channel by a pushing device.

[0016] Furthermore, the insertion channel is inclined, the inclination angle of the insertion channel is the same as the helix angle of the spiral channel, and the insertion channel and the spiral channel are tangentially connected.

[0017] A type of pipe, manufactured by the above-mentioned pipe processing method for enhancing deformation resistance, includes a flame-retardant silicon core layer and an HDPE matrix layer, wherein the flame-retardant silicon core layer is an inner layer, the HDPE matrix layer is an outer layer, and the HDPE matrix layer is covered with spiral glass fiber reinforcing ribs.

[0018] Furthermore, the pitch of the fiberglass reinforcing rib is 1.5 times the diameter of the pipe, and the helix angle of the fiberglass reinforcing rib is 15° to 30°.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention utilizes a process of simultaneous double-layer co-extrusion and spiral reinforcing rib forming to precisely form spiral glass fiber reinforcing ribs within the HDPE matrix layer. The reinforcing ribs and HDPE matrix layer achieve a tight bond through fusion bonding, resulting in high bonding strength. Combined with the design of corresponding pipe diameter pitch and helix angle, the non-roundness of the pipe after winding is significantly reduced, while the compressive strength of the pipe is significantly improved. This ensures a uniform friction coefficient of the silicon core layer, reduces cable pulling resistance, and improves construction efficiency.

[0021] 2. The flame-retardant silicon core layer in this invention adopts a composite formula of silicone masterbatch + starch or silicon dioxide + phosphazene. Starch or silicon dioxide and phosphazene form a synergistic flame-retardant system, and the flame retardant level reaches the UL94V-0 standard. Compared with the existing silicon core tubes without flame retardant properties, the limiting oxygen index is improved, which can effectively cope with underground high temperature or short circuit fire scenarios, eliminate safety hazards, and ensure the safe operation of optical cables.

[0022] 3. The present invention uses injection-molded snap-fit ​​connectors at both ends of the pipe after production, eliminating the need for subsequent assembly. Finished pipes can be directly connected using snap-fit, reducing the connection time of a single connector from 30 minutes in the existing technology to 5 minutes, improving efficiency by more than 80%. At the same time, snap-fit ​​connection does not require special electrofusion equipment and professional operators, reducing construction costs and difficulty, and is especially suitable for scenarios with high time requirements such as emergency communication repair. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an extrusion die for Example 1.

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0025] Figure 3 This is a schematic diagram showing the connection between the spiral channel and the insertion channel in Example 1.

[0026] Figure 4This is a cross-sectional view of the pipe in Example 2.

[0027] Reference numerals: 1. Mandrel; 11. Extrusion section; 2. First outer mold; 21. Mold body; 211. Insertion channel; 212. First spiral groove; 213. Mounting groove; 22. Mold sleeve; 221. Sleeve; 222. Second spiral groove; 3. Second outer mold; 101. First flow channel; 1011. First extrusion channel; 102. Second flow channel; 1021. Second extrusion channel; 103. Spiral channel; 201. Flame-retardant silicone core layer; 202. HDPE matrix layer; 203. Fiberglass reinforcement. Detailed Implementation

[0028] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1:

[0030] like Figures 1-3 As shown in the figure, this embodiment discloses a method for processing pipes with enhanced resistance to deformation, including the following steps:

[0031] S1. Raw material preparation: Complete the preparation of HDPE matrix layer raw materials, glass fiber reinforcing ribs, and flame-retardant silicon core layer raw materials respectively;

[0032] Among them, the preparation of HDPE matrix layer raw materials: HDPE resin and polydopamine compatibilizer are mixed evenly according to a set ratio, wherein the amount of polydopamine compatibilizer added is 2% of the mass of HDPE resin. Polydopamine compatibilizer can significantly improve the interfacial bonding force between HDPE matrix layer 202 and glass fiber reinforcing rib 203, and enhance the bonding force between glass fiber reinforcing rib 203 and HDPE matrix layer 202.

[0033] Preparation of glass fiber reinforcement 203: HDPE resin and glass fiber are mixed evenly at a mass ratio of 7:3, and extruded through an extruder to obtain continuous glass fiber reinforcement. The diameter of the reinforcement is controlled at 0.5 mm. HDPE resin of the same origin as HDPE matrix layer 202 is selected as the base material of glass fiber reinforcement 203, which can further improve the compatibility between glass fiber reinforcement 203 and HDPE matrix layer 202 and ensure the stability of composite structure. The extruded glass fiber reinforcement 203 is wound up for later use.

[0034] Preparation of flame-retardant silicon core layer raw materials: Silicone masterbatch, starch or silica, and phosphazene are mixed evenly in a set ratio, wherein the amount of starch or silica added is 5% to 7% (mass percentage), and the amount of phosphazene (preferably ethoxy(pentafluoro)cyclotriphosphazene) added is 3% to 5% (mass percentage); starch or silica can form a porous barrier layer during combustion, and phosphazene can inhibit the combustion chain reaction. The synergistic effect of the two gives the silicon core layer excellent flame-retardant properties.

[0035] S2. Pipe Extrusion: The HDPE matrix layer raw material and flame-retardant silicon core layer raw material prepared in step S1 are added to a twin-screw extruder and co-extruded through an extrusion die to form an HDPE matrix layer 202 (outer layer) and a flame-retardant silicon core layer 201 (inner layer) of the pipe. During the co-extrusion process, the glass fiber reinforcing ribs 203 prepared in step S1 are simultaneously inserted into the extrusion die and guided by the spiral channel 103 in the extrusion die to form a spiral glass fiber reinforcing rib 203, and the spiral glass fiber reinforcing rib 203 is located within the HDPE matrix layer 202.

[0036] To achieve the integration of the aforementioned spiral glass fiber reinforcing rib 203 into the double-layer co-extruded pipe, an extrusion die is provided, comprising a mandrel 1, a first outer die 2, and a second outer die 3. The first outer die 2 and the mandrel 1 are fixedly connected. The mandrel 1 includes an extrusion section 11, which passes sequentially through the first outer die 2 and the second outer die 3, providing internal support for the molding of the inner layer (flame-retardant silicon core layer 201) and the outer layer (HDPE matrix layer 202) of the pipe. The outer diameter of the extrusion section 11 is the inner diameter of the extruded pipe. A first flow channel 101 is formed between the mandrel 1 and the first outer die 2. The first flow channel 101 is a flow channel for the flame-retardant silicon core layer raw material, used to transport the flame-retardant silicon core layer raw material to the molding area. A first extrusion channel 1011 is formed between the first outer die 2 and the extrusion section 11 of the mandrel 1. The first extrusion channel 1011 is connected to the first flow channel 101, and the first extrusion channel 1011 extrudes the flame-retardant silicon core layer 201.

[0037] The second outer mold 3 is fixedly installed at the extrusion end of the first outer mold 2. A second flow channel 102 is formed between the mandrel 1, the first outer mold 2, and the second outer mold 3. The second flow channel 102 is a flow channel for the HDPE matrix layer raw material. The second flow channel 102 is connected to the extruder on the outer wall that melts the HDPE matrix layer raw material and is used to transport the HDPE matrix layer raw material to the molding area. A second extrusion channel 1021 is formed between the second outer mold 3 and the extrusion section 11 of the mandrel 1. The second extrusion channel 1021 is located at the extrusion end of the first extrusion channel 1011. The diameter of the second extrusion channel 1021 is larger than the diameter of the first extrusion channel 1011, ensuring that the HDPE matrix layer 202 can completely cover the outside of the flame-retardant silicone core layer 201.

[0038] The first outer mold 2 is a split assembly structure, specifically including a mold body 21 and a mold sleeve 22. The two are detachably fixedly connected (e.g., by bolts), which facilitates the subsequent replacement of the mold sleeve 22 to adjust the parameters of the spiral channel 103 according to different pipe specifications. The mold body 21 has a cylindrical stepped structure, and a circular mounting groove 213 is provided on the end face near the extrusion section 11 of the mandrel 1. The inner diameter of the mounting groove 213 is adapted to the outer diameter of the sleeve 221 of the mold sleeve 22, ensuring that the mold sleeve 22 can be tightly embedded in the mounting groove 213. The mold sleeve 22 consists of a sleeve 221 and a flange. The flange is located at one end of the sleeve 221 and is used to position and fit against the end face of the mold body 21. The flange has bolt holes corresponding to the mold body 21. The mold body 21 and the mold sleeve 22 are fixed and locked by bolts. The bolt holes are closed after the bolts are installed to ensure that the end face of the mold body 21 is smooth. The mounting groove 21 The inner wall of the sleeve 221 is provided with a continuous first spiral groove 212 along the circumference. The cross-section of the first spiral groove 212 is semi-circular, and the radius matches the diameter of the fiberglass reinforcing rib 203 to ensure that the reinforcing rib can pass smoothly. The outer wall of the sleeve 221 is provided with a second spiral groove 222 that is completely consistent with the spiral parameters of the first spiral groove 212. The cross-section of the second spiral groove 222 is also semi-circular. When the mold sleeve 22 is installed in the mounting groove 213 of the mold body 21, the first spiral groove 212 and the second spiral groove 222 are precisely aligned to form a closed spiral channel 103 with a circular cross-section and a diameter slightly larger than that of the fiberglass reinforcing rib 203. This not only ensures the smooth passage of the reinforcing rib and allows the fiberglass reinforcing rib 203 to form a spiral shape, but also guides and limits it to prevent the fiberglass reinforcing rib 203 from deviating. In addition, the spiral angle of the first spiral groove 212 is consistent with the designed spiral angle of the reinforcing rib (15°~30°).

[0039] The first outer mold 2 is provided with an insertion channel 211, which connects the spiral channel 103 and the outer wall of the first outer mold 2, and the inner end of the insertion channel 211 connects to the inner end of the spiral channel 103. During pipe extrusion, the fiberglass reinforcing rib 203 is pushed into the spiral channel 103 from the outside through the insertion channel 211 by a pushing device (the pushing device can be a traction roller group). The speed at which the pushing device pushes the fiberglass reinforcing rib 203 matches the speed of pipe extrusion. The fiberglass reinforcing rib 203 is installed at the entrance of the insertion channel 211. The guide sleeve is made of wear-resistant ceramic material, which can reduce the wear of the fiberglass reinforcing rib 203 when it is inserted. The inner diameter of the guide sleeve is clearance-fitted with the diameter of the fiberglass reinforcing rib 203. More preferably, the insertion channel 211 is inclined, and its inclination angle is the same as the helix angle of the spiral channel 103. The insertion channel 211 is tangentially connected to the spiral channel 103, so that the fiberglass reinforcing rib 203 can smoothly transition from linear motion to spiral motion. This can ensure that the fiberglass reinforcing rib 203 enters the spiral channel 103 smoothly and avoid wear or breakage of the reinforcing rib due to channel bends.

[0040] Before extruding the HDPE matrix layer 202 and the flame-retardant silicone core layer 201, the die of the twin-screw extruder needs to be preheated, with the preheating temperature controlled at 150-180℃. In order to ensure that the glass fiber reinforcing rib 203 is heated and shaped within the spiral channel 103 before extruding the HDPE matrix layer 202 and the flame-retardant silicone core layer 201, and can maintain its spiral shape after extending out of the spiral channel 103, the glass fiber reinforcing rib 203 extends at least partially out of the spiral channel 103 before extruding the HDPE matrix layer 202 and the flame-retardant silicone core layer 201. The spirally formed glass fiber reinforcing rib 203 can always close the spiral channel 103, preventing the HDPE matrix layer material from entering the spiral channel 103, so that the extended part can fully fuse with the molten HDPE matrix layer material, improving the bonding strength between the reinforcing rib and the HDPE matrix layer 202. The extruded HDPE matrix layer material covers the glass fiber reinforcing rib 203.

[0041] S3. Cooling and Shaping: The composite pipe extruded in step S2 is sent to a cooling device and cooled and shaped using a segmented cooling method. Specifically, it is first pre-cooled with 20°C cold air to quickly solidify and shape the pipe surface, avoiding surface deformation. Then it is sent to a 25°C cold water bath for thorough cooling to ensure that the inside of the pipe is completely solidified. The cooled pipe has a stable structure and is not prone to subsequent deformation. During the cooling process, the traction speed of the pipe is controlled to match the extrusion speed through a traction device. The traction speed is set to 0.8-1.2m / min to avoid dimensional deviations caused by stretching of the pipe.

[0042] S4. End Injection Molded Connector: The pipe material cooled and shaped in S3 is cut to the required construction length (e.g., 2000m / coil or 3000m / coil), and then the cut pipe material is sent into a special injection mold. The injection mold is precisely aligned with both ends of the pipe to ensure that the injection-molded connector is coaxial with the pipe material. Molten connector material (preferably 30% glass fiber reinforced HDPE, which has excellent compressive strength and aging resistance) is injected into the injection mold to form snap-fit ​​connectors at both ends of the pipe material. After injection molding, the pipe material is cooled and demolded to obtain a finished pipe material with a pre-set snap-fit ​​connector. The snap-fit ​​connector includes a male connector and a female connector. The male connector has an annular snap-fit ​​protrusion on the outside and a matching annular groove on the inside of the female connector. At the same time, the end of the male connector has a sealing rubber ring groove, which can realize quick snap-fit ​​connection without the need for special electrofusion equipment.

[0043] Example 2:

[0044] like Figure 4 As shown, this embodiment discloses a pipe material supported by the pipe material processing method for enhancing deformation resistance in Embodiment 1. The pipe material includes, from the inside out, a flame-retardant silicon core layer 201 and an HDPE matrix layer 202, wherein the HDPE matrix layer 202 is covered with a spiral glass fiber reinforcing rib 203, forming a composite structure of "inner layer-outer layer-inner reinforcing rib".

[0045] The pitch of the fiberglass reinforcing rib 203 is 1.5 times the pipe diameter, and the helix angle is 15° to 30°. Taking a pipe with a nominal diameter of 40mm as an example, its outer diameter is 40mm, inner diameter is 33mm, and wall thickness is 3.5mm. The corresponding pitch of the fiberglass reinforcing rib 203 is 60mm, and the helix angle is preferably 20°. Even if the fiberglass reinforcing rib 203 undergoes slight tensile or compressive deformation during extrusion, it will not affect the supporting force of the fiberglass reinforcing rib 203. This parameter design allows the fiberglass reinforcing rib 203 to evenly distribute the radial pressure and axial tension borne by the pipe, improving the deformation resistance without affecting the flexibility of the pipe. After testing, the pipe's out-of-roundness after winding is ≤2%, which is 50% lower than the existing technology. The interlayer peel strength between the HDPE matrix layer 202 and the fiberglass reinforcing rib 203 is ≥15N / mm, the limiting oxygen index of the flame-retardant silicon core layer 201 is ≥32, and the flame retardant rating meets the UL94V-0 standard.

[0046] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for processing pipes to enhance their resistance to deformation, characterized in that, Includes the following steps: S1. Prepare HDPE matrix layer raw materials, prepare glass fiber reinforcing ribs, and prepare flame-retardant silicon core layer raw materials; S2. HDPE matrix layer raw material and flame-retardant silicon core layer raw material are added to a twin-screw extruder for double-layer co-extrusion to form HDPE matrix layer and flame-retardant silicon core layer of pipe. The flame-retardant silicon core layer is the inner layer and HDPE matrix layer is the outer layer. During the double-layer co-extrusion process, glass fiber reinforcing ribs are inserted into the extrusion die to form spiral glass fiber reinforcing ribs. The spiral glass fiber reinforcing ribs are located inside the HDPE matrix layer. S3. Cooling and shaping of the extruded tubing; S4. Cut the pipe to the required length and send it into the injection mold. Connect the injection molds at both ends of the pipe and injection mold the ends of the pipe to form snap-fit ​​connectors.

2. The method for processing pipes with enhanced deformation resistance according to claim 1, characterized in that, In step S1, HDPE resin and polydopamine compatibilizer are mixed evenly to form HDPE matrix layer raw material. HDPE resin and glass fiber are mixed evenly and extruded through an extruder to obtain continuous glass fiber reinforcement. Silicone masterbatch, starch or silica, and phosphazene are mixed evenly to form flame retardant silicon core layer raw material.

3. The method for processing pipes with enhanced deformation resistance according to claim 1, characterized in that, In step S2, the die of the twin-screw extruder is preheated. Before extruding the HDPE matrix layer (202) and the flame-retardant silicon core layer (201), the glass fiber reinforcing rib (203) is inserted into the extrusion die and a spiral glass fiber reinforcing rib (203) is formed through the spiral channel (103) in the extrusion die, so that the spiral reinforcing rib extends at least partially out of the spiral channel (103).

4. The method for processing pipes with enhanced deformation resistance according to claim 1, characterized in that, In step S2, the extrusion mold includes a mandrel (1), a first outer mold (2), and a second outer mold (3). The mandrel (1) includes an extrusion section (11) that passes through the first outer mold (2) and the second outer mold (3). A first flow channel (101) is formed between the mandrel (1) and the first outer mold (2). The first flow channel (101) is used for the flow of raw materials for the flame-retardant silicon core layer (201). The second outer mold (3) is fixedly installed on the first outer mold (2). A second flow channel (102) is formed between the mandrel (1), the first outer mold (2), and the second outer mold (3). The second flow channel (102) is used for the flow of raw materials for the HDPE matrix layer (202).

5. The method for processing pipes with enhanced deformation resistance according to claim 4, characterized in that, A first extrusion channel (1011) is formed between the first outer mold (2) and the extrusion section (11), and a second extrusion channel (1021) is formed between the second outer mold (3) and the extrusion section (11). The second extrusion channel (1021) is located at the extrusion end of the first extrusion channel (1011), and the diameter of the second extrusion channel (1021) is larger than the diameter of the first extrusion channel (1011).

6. The method for processing pipes with enhanced deformation resistance according to claim 4, characterized in that, The first outer mold (2) includes a mold body (21) and a mold sleeve (22). The mold sleeve (22) is installed at the end of the mold body (21) corresponding to the extrusion section (11). The mold sleeve (22) includes a sleeve (221). The mold body (21) includes a mounting groove (213). The sleeve (221) is installed in the mounting groove (213). The inner wall of the mounting groove (213) is provided with a first spiral groove (212). The outer wall of the mounting groove (213) is provided with a second spiral groove (222) corresponding to the first spiral groove (212). The first spiral groove (212) and the second spiral groove (222) correspond to form the spiral channel (103).

7. The method for processing pipes with enhanced deformation resistance according to claim 4, characterized in that, The first outer mold (2) includes an insertion channel (211), which connects the spiral channel (103) and the outer side wall of the first outer mold (2). The insertion channel (211) also connects to the inner end of the spiral channel (103). The fiberglass reinforcing rib (203) is pushed into the spiral channel (103) from the outside through the insertion channel (211) by a pushing device.

8. The method for processing pipes with enhanced deformation resistance according to claim 7, characterized in that, The insertion channel (211) is inclined, the inclination angle of the insertion channel (211) is the same as the helix angle of the spiral channel (103), and the insertion channel (211) and the spiral channel (103) are tangentially connected.

9. A pipe, manufactured by the pipe processing method for enhancing deformation resistance according to any one of claims 1-8, characterized in that, It includes a flame-retardant silicon core layer (201) and an HDPE matrix layer (202), wherein the flame-retardant silicon core layer (201) is the inner layer and the HDPE matrix layer (202) is the outer layer, and the HDPE matrix layer (202) is covered with spiral glass fiber reinforcing ribs (203).

10. The pipe according to claim 9, characterized in that, The pitch of the fiberglass reinforcing rib (203) is 1.5 times the diameter of the pipe, and the helix angle of the fiberglass reinforcing rib (203) is 15° to 30°.

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