A high voltage cable insulation protective layer covering device and covering method

Abstract

The present invention relates to the field of cable processing technology, specifically a high-voltage cable insulation protective layer coating device and coating method. The high-voltage cable insulation protective layer coating device includes: an extruder; a mold assembly, which is arranged at the discharge end of the extruder; the mold assembly includes: an outer cylinder, which is fixedly connected to the extruder; an inner cylinder, which is arranged in the outer cylinder, and a flow channel is formed between the inner cylinder and the outer cylinder; a cone sleeve, which is arranged at the end of the outer cylinder; a cone cylinder, which is arranged at the end of the inner cylinder, and a flow channel is formed between the cone cylinder and the cone sleeve; an intermediate cylinder, which connects the outer cylinder and the cone sleeve; the intermediate cylinder includes: an intermediate cylinder body, which is rotatably connected to the outer cylinder; an intermediate cylinder cavity, which is opened in the intermediate cylinder body, and the central axis of the intermediate cylinder cavity does not coincide with the rotation axis of the intermediate cylinder body; the cone sleeve includes: a cone sleeve body, which is rotatably connected to the intermediate cylinder cavity; a cone sleeve cavity, which is opened in the cone sleeve body, and the central axis of the cone sleeve cavity does not coincide with the rotation axis of the cone sleeve body. It can adjust the thickness and uniformity of the cable insulation coating layer.

Description

Technical Field

[0001] The present invention relates to the technical field of cable processing, and in particular to a high-voltage cable insulation protection layer covering device and covering method. Background Art

[0002] The basic structure of a cable is mainly composed of a wire core and an insulating layer covering it. The main function of the insulating layer is to prevent leakage during cable use.

[0003] The current insulation production process typically involves using an extruder to melt and plasticize the raw materials into a uniform insulating adhesive solution, which is then extruded onto the wire core through a mold. However, if the inner and outer molds are eccentric—that is, misaligned—the concentricity between the wire core and the insulation coating can be seriously affected. This lack of concentricity directly results in uneven circumferential thickness of the extruded insulation layer. This uneven thickness not only detracts from the cable's appearance but, more importantly, poses a potential risk: it can weaken the cable's electrical performance and mechanical strength, ultimately impacting its overall reliability and service life.

[0004] The mold adjustment mechanism commonly used in current production usually relies solely on bolt pressure to fine-tune the position, which has limited adjustment accuracy and makes it difficult to effectively ensure and maintain the concentricity of the mold. Summary of the Invention

[0005] In order to solve the technical problems existing in the background technology, the present invention provides a high-voltage cable insulation protective layer covering device and covering method, which can adjust the thickness and uniformity of the cable insulation covering layer.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A high-voltage cable insulation protection layer covering device, comprising:

[0008] Extruder;

[0009] A die assembly is provided at the discharge end of the extruder;

[0010] The mold assembly includes:

[0011] The outer cylinder is fixedly connected to the extruder;

[0012] The inner cylinder is arranged in the outer cylinder, and a flow channel is formed between the inner cylinder and the outer cylinder;

[0013] A cone sleeve is provided at the end of the outer cylinder;

[0014] The cone is arranged at the end of the inner cylinder, and a flow channel is formed between the cone and the cone sleeve;

[0015] The middle cylinder connects the outer cylinder and the cone sleeve;

[0016] The intermediate cylinder includes:

[0017] The middle cylinder is rotatably connected to the outer cylinder;

[0018] An intermediate cylinder cavity is provided in the intermediate cylinder body, wherein a central axis of the intermediate cylinder cavity does not coincide with a rotation axis of the intermediate cylinder body;

[0019] The cone sleeve includes:

[0020] The cone sleeve is rotatably connected to the middle cylinder cavity;

[0021] The cone sleeve cavity is arranged in the cone sleeve body, and the central axis of the cone sleeve cavity does not coincide with the rotation axis of the cone sleeve body.

[0022] Furthermore, the outer cylinder includes:

[0023] The outer cylinder is fixedly connected to the extruder;

[0024] The outer cylinder cavity is provided in the outer cylinder body;

[0025] The inner cylinder includes:

[0026] The inner cylinder is fixedly arranged in the outer cylinder cavity, and a flow channel is formed between the inner cylinder and the outer cylinder cavity;

[0027] The inner cylinder cavity is opened in the inner cylinder body.

[0028] Furthermore, the outer wall of the inner cylinder is provided with evenly distributed grooves.

[0029] Furthermore, the outer cylinder further comprises:

[0030] An outer cylinder groove is provided at the end of the outer cylinder;

[0031] The intermediate barrel also includes:

[0032] The intermediate cylinder platform is coaxially arranged at the end of the intermediate cylinder body and rotatably arranged in the outer cylinder groove. The intermediate cylinder body and the intermediate cylinder cavity are not coaxial.

[0033] An intermediate cylinder groove is coaxially formed at the end of the intermediate cylinder cavity;

[0034] The intermediate cylinder and the intermediate cylinder cavity are not coaxial;

[0035] The drogue also includes:

[0036] The cone sleeve platform is coaxially arranged at the end of the cone sleeve body. The cone sleeve platform is rotatably arranged in the middle cylinder groove. The cone sleeve body is rotatably arranged in the middle cylinder cavity. The cone sleeve body and the cone sleeve cavity are not coaxial.

[0037] Furthermore, a fixing ring is installed at the end of the outer cylinder, and the fixing ring includes:

[0038] a ring body, fixedly connected to the outer cylinder;

[0039] The inner hole is opened in the ring body, and the middle cylinder is rotatably arranged in the inner hole.

[0040] Furthermore, the intermediate cylinder is provided with a first worm gear, and the fixing ring is provided with a worm that cooperates with the first worm gear;

[0041] The cone sleeve body is provided with a second worm gear, and the intermediate cylinder is provided with a worm matched with the second worm gear.

[0042] Furthermore, an internal thread is provided at the end of the inner cylinder cavity;

[0043] The cone includes:

[0044] The conical cylinder is located in the conical sleeve cavity and is provided with an external thread that matches the internal thread, and a flow channel is formed between the conical cylinder and the conical sleeve cavity;

[0045] The conical cylinder cavity is opened in the conical cylinder body.

[0046] Furthermore, a slot is provided on the inner wall of the conical cylinder cavity.

[0047] Furthermore, the outer cylinder is connected to the discharge end of the extruder through a connector.

[0048] A method for coating a high-voltage cable with an insulating protective layer comprises the following steps:

[0049] a. The wire core first passes through the inner cylinder cavity, and then continues to pass through the conical cylinder cavity and extend out;

[0050] b. The molten insulation material extruded by the extruder flows into the uniform distribution groove, then flows into the annular flow channel formed between the outer surface of the cone cylinder and the inner surface of the cone sleeve cavity, and finally flows out and evenly covers the outer surface of the moving wire core, forming a continuous insulation protective layer;

[0051] c. By rotating the cone, the annular flow channel gap between the cone body and the cone sleeve cavity can be adjusted, thereby adjusting the wall thickness of the insulating protective layer finally coated on the wire core;

[0052] d. By rotating the intermediate cylinder and the cone sleeve in coordination, the position of the cone sleeve cavity relative to the cone cylinder body can be adjusted to ensure that the annular flow channel gap between the cone cylinder body and the cone sleeve cavity is uniform over the entire circumference, thereby ensuring that the thickness of the extruded insulating protective layer is evenly distributed in the circumferential direction.

[0053] Beneficial effects of the present invention:

[0054] (1) It can adjust the thickness and uniformity of the cable insulation coating to ensure the overall reliability and service life of the cable.

[0055] (2) By rotating the cone, the gap between the cone body and the cone sleeve cavity can be changed to adjust the thickness of the final insulation layer on the wire core.

[0056] (3) By co-rotating the intermediate cylinder and the cone sleeve, the position of the cone cylinder relative to the cone sleeve cavity can be adjusted so that the annular flow channel gap between the cone cylinder and the cone sleeve cavity is uniform in the circumferential direction, thereby ensuring that the thickness of the extruded insulation layer is evenly distributed over the entire circumference. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention will be further described below with reference to the accompanying drawings and examples.

[0058] Figure 1 It is a structural schematic diagram of the present invention;

[0059] Figure 2 It is a structural diagram of the mold assembly;

[0060] Figure 3 is a cross-sectional view of the mold assembly;

[0061] Figure 4 It is a structural diagram of the outer cylinder;

[0062] Figure 5 It is a structural diagram of the inner cylinder;

[0063] Figure 6 It is a structural diagram of the cone;

[0064] Figure 7 It is a structural diagram of the fixing ring;

[0065] Figure 8 It is a structural diagram of the intermediate cylinder;

[0066] Figure 9 It is a structural diagram of the cone sleeve;

[0067] Figure 10 It is a geometric relationship diagram of the present invention.

[0068] In the picture:

[0069] 1. Extruder, 2. Die assembly;

[0070] 21. Outer cylinder, 22. Inner cylinder, 23. Cone cylinder, 24. Fixed ring, 25. Intermediate cylinder, 26. Cone sleeve, 27. Connector;

[0071] 211. Outer cylinder, 212. External cylinder cavity, 213. External cylinder groove;

[0072] 221. Inner cylinder, 222. Uniformly distributed grooves, 223. Inner cylinder cavity, 224. Internal thread;

[0073] 231. Conical cylinder, 232. External thread, 233. Conical cylinder cavity, 234. Slot;

[0074] 241. Ring body, 242. Inner hole;

[0075] 251. Intermediate cylinder, 252. First worm gear, 253. Intermediate cylinder cavity, 254. Intermediate cylinder groove, 255. Intermediate cylinder platform;

[0076] 261. Cone sleeve body, 262. Second worm gear, 263. Cone sleeve platform, 264. Cone sleeve cavity. DETAILED DESCRIPTION

[0077] The present invention will be further described in detail below with reference to the accompanying drawings.

[0078] like Figure 1 As shown, a high-voltage cable insulation protective layer coating device includes an extruder 1. A die assembly 2 is disposed at the discharge end of the extruder 1. The extruder 1 melts and plasticizes the raw materials to form a uniform insulating adhesive liquid, which is then extruded and coated onto the wire core through the die assembly 2.

[0079] like Figure 2 、 3 As shown, the specific structure of the mold assembly 2 includes an outer cylinder 21. The outer cylinder 21 is fixedly connected to the extruder 1. In a specific embodiment, the outer cylinder 21 is connected to the discharge end of the extruder 1 through a connector 27. The inner cylinder 22 is arranged in the outer cylinder 21, and a flow channel is formed between the inner cylinder 22 and the outer cylinder 21. The cone sleeve 26 is arranged at the end of the outer cylinder 21. The cone 23 is arranged at the end of the inner cylinder 22, and a flow channel is formed between the cone 23 and the cone sleeve 26. The intermediate cylinder 25 connects the outer cylinder 21 and the cone sleeve 26. The insulating glue produced by the extruder 1 enters the flow channel between the inner cylinder 22 and the outer cylinder 21 through the connector 27, and is then discharged from the annular flow channel between the cone 23 and the cone sleeve 26, and is coated on the outer periphery of the wire core.

[0080] like Figure 8 As shown, the intermediate cylinder 25 specifically includes an intermediate cylinder body 251. The intermediate cylinder body 251 is rotatably connected to the outer cylinder 21. An intermediate cylinder cavity 253 is defined within the intermediate cylinder body 251. The central axis of the intermediate cylinder cavity 253 does not coincide with the rotation axis of the intermediate cylinder body 251. The intermediate cylinder cavity 253 is capable of eccentric rotation relative to the outer cylinder 21.

[0081] like Figure 9 As shown, the specific structure of the cone sleeve 26 includes a cone sleeve body 261, which is rotatably connected to the intermediate cylinder cavity 253. A cone sleeve cavity 264 is defined within the cone sleeve body 261. The central axis of the cone sleeve cavity 264 does not coincide with the rotation axis of the cone sleeve body 261. The cone sleeve cavity 264 can rotate eccentrically relative to the intermediate cylinder 25.

[0082] The outer cylinder 21, the intermediate cylinder 25, and the tapered sleeve 26 form a dual eccentric rotation mechanism, allowing precise adjustment of the relative position of the tapered sleeve cavity 264 to the outer cylinder 21, and thus to the relative position of the tapered sleeve cavity 264 to the cone 23. This ensures that the annular flow channel gap between the cone 23 and the tapered sleeve cavity 264 is uniform in the circumferential direction, thereby ensuring that the thickness of the extruded insulation layer is evenly distributed across the entire circumference.

[0083] like Figure 4 As shown, the specific structure of the outer barrel 21 includes an outer barrel body 211, and the outer barrel body 211 is fixedly connected to the extruder 1. The outer barrel cavity 212 is opened in the outer barrel body 211. The outer barrel 21 is connected to the discharge end of the extruder 1 through a connector 27.

[0084] like Figure 5 As shown, the specific structure of the inner cylinder 22 includes an inner cylinder body 221, which is fixedly mounted within the outer cylinder cavity 212, forming a flow channel between the inner cylinder body 221 and the outer cylinder cavity 212. An inner cylinder cavity 223 is defined within the inner cylinder body 221. The outer wall of the inner cylinder body 221 is provided with a uniform distribution groove 222. The uniform distribution groove 222 ensures a more uniform distribution of the insulating adhesive between the inner cylinder body 221 and the outer cylinder cavity 212 in the circumferential direction, thereby ensuring a more uniform thickness of the cable insulation layer.

[0085] The outer cylinder 21 also includes an outer cylinder groove 213, which is formed at the end of the outer cylinder body 211. The intermediate cylinder 25 also includes an intermediate cylinder platform 255, which is coaxially disposed at the end of the intermediate cylinder body 251 and rotatably disposed in the outer cylinder groove 213. The intermediate cylinder body 251 and the intermediate cylinder cavity 253 are not coaxial. An intermediate cylinder groove 254 is coaxially disposed at the end of the intermediate cylinder cavity 253. The intermediate cylinder body 251 and the intermediate cylinder cavity 253 are not coaxial. When the intermediate cylinder body 251 rotates centered relative to the outer cylinder 21, the intermediate cylinder cavity 253 can rotate eccentrically relative to the outer cylinder 21.

[0086] The specific structure of the tapered sleeve 26 also includes a tapered sleeve platform 263, which is coaxially mounted at the end of the tapered sleeve body 261. The tapered sleeve platform 263 is rotatably mounted in the intermediate cylinder groove 254. The tapered sleeve body 261 is rotatably mounted in the intermediate cylinder cavity 253. The tapered sleeve body 261 and the tapered sleeve cavity 264 are not coaxial. When the tapered sleeve body 261 rotates centered relative to the intermediate cylinder 25, the tapered sleeve cavity 264 can rotate eccentrically relative to the intermediate cylinder 25. This creates a dual eccentric rotation mechanism composed of the outer cylinder 21, the intermediate cylinder 25, and the tapered sleeve 26.

[0087] like Figure 7As shown, a retaining ring 24 is mounted on the end of the outer cylinder 21. The retaining ring 24 comprises a ring body 241, which is fixedly connected to the outer cylinder 21. An inner hole 242 is defined within the ring body 241, and an intermediate cylinder 251 is rotatably disposed within the inner hole 242. The retaining ring 24 provides axial sealing, compression, and fixation for the intermediate cylinder 25. The intermediate cylinder 25 also provides axial sealing, compression, and fixation for the tapered sleeve 26.

[0088] To facilitate the rotation of the intermediate cylinder 25 and the tapered sleeve 26, the intermediate cylinder body 251 is provided with a first worm gear 252, and the retaining ring 24 is equipped with a worm that mates with the first worm gear 252. The tapered sleeve body 261 is provided with a second worm gear 262, and the intermediate cylinder 25 is equipped with a worm that mates with the second worm gear 262. By turning the corresponding worm gears, the intermediate cylinder 25 and the tapered sleeve 26 can be rotated respectively. The worm gear transmission also has fine-tuning and self-locking functions, ensuring more precise and stable relative positioning of the outer cylinder 21, the intermediate cylinder 25, and the tapered sleeve 26.

[0089] like Figure 6 As shown, the end of the inner cylinder cavity 223 is provided with an internal thread 224. The specific structure of the cone 23 includes a cone body 231, which is located in the cone sleeve cavity 264 and is provided with an external thread 232 that cooperates with the internal thread 224. A flow channel is formed between the cone body 231 and the cone sleeve cavity 264. The cone cavity 233 is provided in the cone body 231. The inner wall of the cone cavity 233 is provided with a slot 234. By inserting a specific tool into the slot 234, the cone 23 can be rotated, and the size of the gap in the annular flow channel between the cone body 231 and the cone sleeve cavity 264 can be changed, thereby adjusting the wall thickness of the final insulation layer coated on the wire core.

[0090] A method for coating a high-voltage cable with an insulating protective layer comprises the following steps:

[0091] a. The wire core first passes through the inner cylinder cavity 223 and then continues to extend through the conical cylinder cavity 233.

[0092] b. The molten insulating material extruded by the extruder 1 flows into the uniformly distributed groove 222 between the inner cylinder 22 and the outer cylinder 21, and then flows into the annular flow channel formed between the outer surface of the cone cylinder 231 and the inner surface of the cone sleeve cavity 264, and finally flows out and evenly covers the outer surface of the moving wire core to form a continuous insulating protective layer.

[0093] c. By rotating the cone 23, the size of the annular flow channel gap between the cone body 231 and the cone sleeve cavity 264 can be adjusted, thereby adjusting the wall thickness of the insulating protective layer finally coated on the wire core.

[0094] d. By coordinating the rotation of the intermediate cylinder 25 and the cone sleeve 26, the position of the cone sleeve cavity 264 relative to the cone cylinder body 231 can be adjusted to ensure that the annular flow channel gap between the cone cylinder body 231 and the cone sleeve cavity 264 is uniform over the entire circumference, thereby ensuring that the thickness of the extruded insulating protective layer is evenly distributed in the circumferential direction.

[0095] The geometric principle of the present invention is further explained:

[0096] like Figure 10 As shown, the eccentric distance between the center of the intermediate cylinder 251 and the center of the tapered sleeve 261 is e1, and the eccentric distance between the center of the tapered sleeve cavity 264 and the center of the tapered sleeve 261 is e2. As the intermediate cylinder 251 and the tapered sleeve 261 rotate about their respective centers, the position of the tapered sleeve cavity 264 changes. The starting positions are set as follows: the center of the intermediate cylinder 251 is o1, the center of the tapered sleeve 261 is o2, and the center of the tapered sleeve cavity 264 is o3. Points o1, o2, and o3 are horizontal, with o2 located between o1 and o3. When the intermediate cylinder 251 rotates θ1 and the tapered sleeve 261 rotates θ2, the center of the tapered sleeve cavity 264 is o3.

[0097] Mathematical calculations show that the center position of the conical sleeve cavity 264 is determined by e1, e2, θ1, and θ2. Once e1 and e2 are determined, the distance between o1 and o3 is determined by θ1 and θ2, with values ​​ranging from (|e1-e2| to e1+e2). Therefore, the range that the center of the conical sleeve cavity 264 can reach is an annular area with inner and outer radii of |e1-e2| and e1+e2, respectively. In a specific embodiment, e1=e2, resulting in a circular area within which the center of the conical sleeve cavity 264 can reach.

[0098] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A high voltage cable insulation protection layer covering device, characterized in that: include: Extruder (1); A die assembly (2) is arranged at the discharge end of the extruder (1); The mold assembly (2) comprises: An outer cylinder (21) is fixedly connected to the extruder (1); An inner cylinder (22) is disposed in the outer cylinder (21), and a flow channel is formed between the inner cylinder (22) and the outer cylinder (21); A cone sleeve (26) is provided at the end of the outer cylinder (21); A conical cylinder (23) is arranged at the end of the inner cylinder (22), and a flow channel is formed between the conical cylinder (23) and the conical sleeve (26); An intermediate cylinder (25) connecting the outer cylinder (21) and the cone sleeve (26); The intermediate cylinder (25) comprises: The intermediate cylinder (251) is rotatably connected to the outer cylinder (21); An intermediate cylindrical cavity (253) is provided in the intermediate cylindrical body (251), wherein the central axis of the intermediate cylindrical cavity (253) does not coincide with the rotation axis of the intermediate cylindrical body (251); The cone sleeve (26) comprises: The cone sleeve (261) is rotatably connected to the middle cylindrical cavity (253); The cone sleeve cavity (264) is opened in the cone sleeve body (261), and the central axis of the cone sleeve cavity (264) does not coincide with the rotation axis of the cone sleeve body (261).

2. A high-voltage cable insulation protection layer covering device according to claim 1, characterized in that: The outer cylinder (21) comprises: The outer cylinder (211) is fixedly connected to the extruder (1); An outer cylinder cavity (212) is provided in the outer cylinder body (211); The inner cylinder (22) comprises: The inner cylinder (221) is fixedly disposed in the outer cylinder cavity (212), and a flow channel is formed between the inner cylinder (221) and the outer cylinder cavity (212); The inner cylinder cavity (223) is opened in the inner cylinder body (221).

3. A high-voltage cable insulation protection layer covering device according to claim 2, characterized in that: The outer wall of the inner cylinder (221) is provided with uniformly distributed grooves (222).

4. A high-voltage cable insulation protection layer covering device according to claim 2, characterized in that: The outer cylinder (21) further comprises: An outer cylinder groove (213) is provided at the end of the outer cylinder body (211); The intermediate cylinder (25) further comprises: An intermediate cylinder platform (255) is coaxially arranged at the end of the intermediate cylinder body (251) and rotatably arranged in the outer cylinder groove (213), wherein the intermediate cylinder body (251) and the intermediate cylinder cavity (253) are not coaxial; An intermediate cylindrical groove (254) is coaxially formed at the end of the intermediate cylindrical cavity (253); The intermediate cylinder (251) and the intermediate cylinder cavity (253) are not coaxial; The cone sleeve (26) further comprises: The cone sleeve platform (263) is coaxially arranged at the end of the cone sleeve body (261); the cone sleeve platform (263) is rotatably arranged in the middle cylinder groove (254); the cone sleeve body (261) is rotatably arranged in the middle cylinder cavity (253); the cone sleeve body (261) and the cone sleeve cavity (264) are not coaxial.

5. A high-voltage cable insulation protection layer covering device according to claim 4, characterized in that: A fixing ring (24) is installed at the end of the outer cylinder (21), and the fixing ring (24) comprises: The ring body (241) is fixedly connected to the outer cylinder (21); The inner hole (242) is opened in the ring body (241), and the intermediate cylinder (251) is rotatably arranged in the inner hole (242).

6. A high-voltage cable insulation protection layer covering device according to claim 5, characterized in that: The intermediate cylinder (251) is provided with a first worm gear (252), and the fixing ring (24) is provided with a worm that cooperates with the first worm gear (252); The cone sleeve (261) is provided with a second worm gear (262), and the intermediate cylinder (25) is provided with a worm that cooperates with the second worm gear (262).

7. A high-voltage cable insulation protection layer covering device according to claim 2, characterized in that: An internal thread (224) is provided at the end of the inner cylindrical cavity (223); The cone (23) comprises: The conical cylinder (231) is located in the conical sleeve cavity (264) and is provided with an external thread (232) that matches the internal thread (224), and a flow channel is formed between the conical cylinder (231) and the conical sleeve cavity (264); The conical cylinder cavity (233) is opened in the conical cylinder body (231).

8. A high-voltage cable insulation protection layer covering device according to claim 7, characterized in that: A clamping groove (234) is provided on the inner wall of the conical cylinder cavity (233).

9. The high-voltage cable insulation protection layer covering device according to claim 1, characterized in that: The outer cylinder (21) is connected to the discharge end of the extruder (1) via a connector (27).

10. A method for coating a high-voltage cable insulation protective layer, based on a high-voltage cable insulation protective layer coating device according to any one of claims 1 to 9, characterized in that: The steps include: a. The wire core first passes through the inner cylinder cavity (223) and then continues to extend through the conical cylinder cavity (233); b. The molten insulating material extruded by the extruder (1) flows into the uniform distribution groove (222), then flows into the annular flow channel formed between the outer surface of the cone cylinder (231) and the inner surface of the cone sleeve cavity (264), and finally flows out and evenly covers the outer surface of the moving wire core to form a continuous insulating protective layer; c. By rotating the cone (23), the size of the annular flow channel gap between the cone body (231) and the cone sleeve cavity (264) can be adjusted, thereby adjusting the wall thickness of the insulating protective layer finally coated on the wire core; d. By cooperating to rotate the intermediate cylinder (25) and the cone sleeve (26), the position of the cone sleeve cavity (264) relative to the cone cylinder body (231) can be adjusted to ensure that the annular flow channel gap between the cone cylinder body (231) and the cone sleeve cavity (264) is uniform over the entire circumference, thereby ensuring that the thickness of the extruded insulating protective layer is uniformly distributed in the circumferential direction.

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