A multi-layer composite fire-resistant medium and high voltage cable and its production equipment

Abstract

The present invention proposes a multi-layer composite fire-resistant medium and high voltage cable and its production equipment, which relates to the field of cable production technology; the present invention is provided with a secondary tensioning mechanism. When the cable is in a relaxed state, the device spring in the primary tensioning mechanism prompts the cable tensioning conveying roller to move down, tightening the cable. When the cable tensioning conveying roller is at the bottom, the movable gear is engaged with the bottom gear, and the transmission mechanism is used to make the first conveying roller in the secondary tensioning mechanism move away from the primary tensioning mechanism. When the cable is straightened, the cable conveying drives the tensioning conveying roller to continue to rotate, and the first conveying roller continues to move away from the primary tensioning mechanism. At this time, the cable tensioning conveying roller moves up until the movable gear is separated from the bottom gear. When the secondary tensioning mechanism is working, the primary tensioning mechanism can restore the primary tensioning mechanism to a reasonable tensioning range, leaving a certain warning space for the primary tensioning mechanism. The tensioning mechanism makes the cable in the center position in the extruder to ensure the uniform distribution of the fire-resistant layer.

Description

Technical Field

[0001] The present invention relates to the technical field of cable production, and in particular to a multi-layer composite fire-resistant medium- and high-voltage cable and production equipment thereof. Background Art

[0002] Multi-layer composite fire-resistant medium and high voltage cables are cables with a multi-layer structure that can work in medium and high voltage environments and have fire-resistant properties. They are made by combining multiple materials to meet different performance requirements. The production equipment for multi-layer composite fire-resistant medium and high voltage cables is a series of professional mechanical devices used to combine multiple different materials through a specific process to produce multi-layer structural cables with fire-resistant properties and suitable for medium and high voltage environments.

[0003] In Chinese patent publication number CN218826370U, the utility model discloses an extrusion device for producing fire-resistant cables. This device addresses the problem of existing cable cores often lacking cleaning, water, and preheating devices before entering the die, which results in problems with broken glue, bubbles, and air holes in the extruded cables. The following solution is proposed, which includes a stringing machine, a traction tension machine, a plastic extrusion host, a die, an inspection machine, a cable core, and a pre-processing device. The pre-processing device is equipped with a square plate, and a scraper assembly, a cleaning assembly, and two fixed seats are fixedly mounted on the top of the square plate. A dust removal assembly is provided on the scraper assembly and the cleaning assembly. The utility model can reduce the occurrence of broken glue, bubbles, and air holes in the extruded cables, thereby improving the quality of the extruded fire-resistant cables. The provision of the dust collection assembly allows for the good recycling of removed dirt, making the working environment cleaner and more comfortable for workers.

[0004] In the process of extruding the fire-resistant layer of the cable, the existing production equipment of multi-layer composite fire-resistant medium and high voltage cables is equipped with a tension machine at the front end of the extruder. The tension machine keeps the cable in a taut state and the cable is in the center position in the extruder to ensure the uniformity of the fire-resistant layer. However, the tensioning effect of the tension machine has certain limits. When the tensioning effect reaches a critical value, the cable is difficult to be in the center position in the extruder, resulting in uneven distribution of the fire-resistant layer of the cable. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes a multi-layer composite fire-resistant medium and high voltage cable and its production equipment, which solves the problem that the cable is not in the center position in the extruder.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-layer composite fire-resistant medium and high voltage cable, comprising: a multi-layer composite fire-resistant medium and high voltage cable sheath layer, the inner wall of the multi-layer composite fire-resistant medium and high voltage cable sheath layer is wrapped with a fire-resistant layer, the inner wall of the fire-resistant layer is wrapped with a composite layer, and the inner wall of the composite layer is wrapped with a conductor body; a production equipment for preparing the above-mentioned multi-layer composite fire-resistant medium and high voltage cable, comprising: a cable production equipment base, the top of the cable production equipment base is fixedly connected to a tensioning structure bracket, the interior of the tensioning structure bracket passes through a limiting rod body, the outer wall of the limiting rod body is provided with a device spring, the top of the device spring is fixedly connected to a spring connecting block, the inner part of the spring connecting block passes through A rotating rod is passed through, and the outer wall of the rotating rod is fixedly connected to a movable gear. The bottom of the movable gear is meshed with a bottom gear, and the outer wall of the bottom gear is meshed with a bottom vertical gear. A transmission belt is wrapped around the outer wall of the bottom vertical gear, and the top of the transmission belt is wrapped around the top vertical gear. The outer wall of the top vertical gear is meshed with the top No. 1 gear. The side of the top No. 1 gear is fixedly connected to a gear connecting rod, and one end of the gear connecting rod is fixedly connected to the top No. 2 gear. The side of the bottom vertical gear is fixedly connected to a threaded rod body, and the outer wall of the threaded rod body is threadedly connected to a translation movable plate, and the side of the translation movable plate is movably connected to the first conveying roller, and one end of the rotating rod is fixedly connected to a cable tensioning conveying roller.

[0007] Preferably, the device spring is located between the tensioning structure support and the spring connecting block, and the device spring plays a role of elastic support.

[0008] Preferably, the bottom gear is rotationally connected to the tensioning structure support, and a pair of bottom gears are symmetrically arranged about the vertical center axis of the tensioning structure support.

[0009] Preferably, the top second gear is rotationally connected to the tensioning structure bracket, and the top second gear is located on the top of the movable gear.

[0010] Preferably, a movable sliding groove is provided on the side of the tensioning structure bracket, and the rotating rod is located inside the movable sliding groove.

[0011] Preferably, an L-shaped support plate passes through the side of the top vertical gear, and the L-shaped support plate is fixedly connected to the tensioning structure bracket.

[0012] Preferably, one end of the threaded rod body is movably connected to a threaded rod rotating shaft, an outer wall of the threaded rod rotating shaft is fixedly connected to a threaded rod base, and the threaded rod base is fixedly connected to the base of the cable production equipment.

[0013] Preferably, a wire outlet reel is provided on the side of the threaded rod base, and the wire outlet reel is fixedly connected to the base of the cable production equipment.

[0014] Preferably, a second conveying roller is provided on the side of the cable tensioning conveying roller, and the second conveying roller is fixedly connected to the base of the cable production equipment.

[0015] Preferably, an extruder is installed on the other side of the second conveyor roller, a cooler is provided on the side of the extruder, and a wire reel is provided on the other side of the cooler. The wire reel is fixedly connected to the base of the cable production equipment.

[0016] Compared with the prior art, the present invention has the following advantages: a two-stage tensioning mechanism is provided, which establishes a dual tension adjustment guarantee system. When the cable is in a relaxed state, the spring in the primary tensioning mechanism causes the cable tensioning conveyor roller to move downward, tightening the cable. When the cable tensioning conveyor roller is at the bottom, the movable gear engages with the bottom gear, and the transmission mechanism causes the first conveyor roller in the secondary tensioning mechanism to move away from the primary tensioning mechanism. When the cable is straightened, the cable conveying drives the cable tensioning conveyor roller to continue rotating, and the first conveyor roller continues to move away from the primary tensioning mechanism. At this time, the cable tensioning conveyor roller moves upward until the movable gear separates from the bottom gear. During operation, the secondary tensioning mechanism can restore the primary tensioning mechanism to a reasonable tension range, leaving a certain warning space for the primary tensioning mechanism. The coordinated cooperation of the primary and secondary tensioning mechanisms can accurately position the cable at the center of the extruder, fundamentally eliminating the problem of uneven thickness of the fire-resistant layer caused by cable deviation, significantly improving the fire resistance and overall quality of multi-layer composite fire-resistant medium and high voltage cables, and providing stable and reliable tension control for cable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 2. It is a front view structural schematic diagram of a multi-layer composite fire-resistant medium and high voltage cable production equipment proposed according to one embodiment of the present invention; Figure 2 1 is a schematic cross-sectional view of a multi-layer composite fire-resistant medium and high voltage cable according to one embodiment of the present invention; Figure 3 is an enlarged structural schematic diagram of a secondary tensioning structure portion proposed according to one embodiment of the present invention; Figure 4 is an enlarged structural diagram of a primary tensioning structure portion proposed in one embodiment of the present invention; Figure 5 is an enlarged structural schematic diagram of a cable tensioning and conveying roller portion according to one embodiment of the present invention; Figure 6 2. It is a schematic diagram of the exploded structure of the cable tensioning and conveying roller part proposed in one embodiment of the present invention; Figure 7 is an enlarged structural diagram of the connection between the movable gear and the bottom gear proposed in one embodiment of the present invention; Figure 8is an enlarged structural schematic diagram of a transmission belt portion according to one embodiment of the present invention; Figure 9 is an enlarged structural diagram of a top vertical gear portion proposed according to one embodiment of the present invention; Figure 10 Schematic diagram of the exploded structure of the first conveying roller part according to one embodiment of the present invention.

[0018] Numbers in the figure: 1. Cable production equipment base; 2. Tensioning structure bracket; 3. Limit rod body; 4. Device spring; 5. Spring connecting block; 6. Rotating rod; 7. Movable gear; 8. Bottom gear; 9. Bottom vertical gear; 10. Transmission belt; 11. Top vertical gear; 12. Top No. 1 gear; 13. Gear connecting rod; 14. Top No. 2 gear; 15. Threaded rod body; 16. Translational movable plate; 17. First conveyor roller; 18. Cable tensioning conveyor roller; 19. Multi-layer composite fire-resistant medium and high voltage cable sheath layer; 20. Movable slide; 21. L-shaped support plate; 22. Threaded rod rotating shaft; 23. Threaded rod base; 24. Wire output reel; 25. Second conveyor roller; 26. Extruder; 27. Cooling machine; 28. Wire take-up reel; 29. ​​Fire-resistant layer; 30. Composite layer; 31. Conductor body. DETAILED DESCRIPTION

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0020] According to the embodiment of the present invention, Figures 1 to 10 Shown.

[0021] During the production process of the cable, it needs to pass through the extruder 26 to add the fire-resistant layer 29. The extruder 26 can accurately extrude the refractory material and wrap it on the cable core according to the set parameters. The refractory material can withstand high temperature for a certain period of time, so that the internal structure of the cable, such as the conductor, insulation layer, etc., is protected from direct damage by flames and high temperatures, maintaining its integrity and performance, and ensuring that the cable can still work normally during a fire or can be restored to use as soon as possible after a fire. In the process of extruding the fire-resistant layer 29 of the cable, the existing multi-layer composite fire-resistant medium and high voltage cable production equipment is equipped with a tensioner at the front end of the extruder 26. The tensioner keeps the cable in a stable and tight state, prompting the cable to be in a central position in the extruder 26, ensuring that the fire-resistant layer 29 is evenly distributed on the cable. However, the tensioning effect of the tensioner has a certain limit. When the tensioning effect reaches a critical value, the tension of the cable changes, and the cable is difficult to be in a central position in the extruder 26, resulting in uneven distribution of the fire-resistant layer 29 of the cable, affecting the product qualification rate of the cable. In order to solve this problem, The present invention has been designed as follows: a multi-layer composite fire-resistant medium and high voltage cable, comprising: a multi-layer composite fire-resistant medium and high voltage cable sheath layer 19, the inner wall of the multi-layer composite fire-resistant medium and high voltage cable sheath layer 19 is wrapped with a fire-resistant layer 29, the fire-resistant layer 29 refers to a special protective layer made of a material with fire-resistant properties in the cable structure, and its function is to protect the conductor and insulation layer and other structures inside the cable in a high temperature environment such as a fire, to ensure that the cable can still transmit current normally within a certain period of time, the inner wall of the fire-resistant layer 29 is wrapped with a composite layer 30, the composite layer 30 refers to a structural layer composed of two or more different materials through a specific process, wrapped around the cable core or insulation layer to provide specific performance and protection functions, the inner wall of the composite layer 30 is wrapped with a conductor body 31, the conductor body 31 is formed by twisting a plurality of fine wires, this twisted structure has good flexibility, is convenient for bending and laying the cable, and can also increase the strength of the cable and reduce the risk of breakage due to metal fatigue, the conductor core body is the core part of the cable for transmitting current or signals;The production equipment for preparing the above-mentioned multi-layer composite fire-resistant medium and high voltage cables includes: a cable production equipment base 1, the cable production equipment base 1 is used to install the accessories required for the entire production equipment, the top of the cable production equipment base 1 is fixedly connected to a tensioning structure bracket 2, the tensioning structure bracket 2 is used to provide stable support for the tensioning assembly, the interior of the tensioning structure bracket 2 passes through a limiting rod body 3, the outer wall of the limiting rod body 3 is provided with a device spring 4, the device spring 4 plays an elastic support role to ensure the intelligent adjustment of the tensioning mechanism, the top of the device spring 4 is fixedly connected to a spring connecting block 5, the interior of the spring connecting block 5 passes through a rotating rod 6, the rotating rod 6 plays a limiting role, so that the cable tensioning conveying roller 18 can only move in the vertical direction, the outer wall of the rotating rod 6 is fixedly connected to a movable gear 7, the movable gear 7 The bottom is meshed with a bottom gear 8, the outer wall of which is meshed with a bottom vertical gear 9. A transmission belt 10 is wrapped around the outer wall of the bottom vertical gear 9. A top vertical gear 11 is wrapped around the top of the transmission belt 10. The outer wall of the top vertical gear 11 is meshed with a top first gear 12. A gear connecting rod 13 is fixedly connected to the side of top first gear 12. One end of the gear connecting rod 13 is fixedly connected to the top second gear 14. A threaded rod body 15 is fixedly connected to the side of the bottom vertical gear 9. A translationally movable plate 16 is threadedly connected to the outer wall of the threaded rod body 15. A first conveyor roller 17 is movably connected to the side of the translationally movable plate 16. One end of the rotating rod 6 is fixedly connected to a cable tensioning conveyor roller 18. The threaded rod body 15 is used to control the horizontal movement of the first conveyor roller 17, providing secondary tensioning.

[0022] The multi-layer composite fire-resistant medium and high voltage cable is composed of a multi-layer composite fire-resistant medium and high voltage cable sheath layer 19, a fire-resistant layer 29, a composite layer 30, and a conductor body 31. When the fire-resistant layer 29 is added, the multi-layer composite fire-resistant medium and high voltage cable is transported in the entire production equipment. When the multi-layer composite fire-resistant medium and high voltage cable is in a relaxed state, the device spring 4 pulls the spring connecting block 5 to move downward, and the limit rod body 3 plays a limiting role. When the spring connecting block 5 moves downward, the rotating rod 6 moves downward inside the movable slide 20. During the cable transportation process, the cable tensioning conveying roller 18 is driven to rotate counterclockwise. When the rotating rod 6 is at the bottom of the movable slide 20, the movable gear 7 and the bottom gear 8 are engaged together, and the movable gear 7 rotates counterclockwise to drive the bottom gear 8 clockwise. The needle rotates, and the bottom gear 8 drives the bottom vertical gear 9 and the threaded rod body 15 to rotate counterclockwise. The threaded rod body 15 is threadedly connected to the translation movable plate 16. At this time, the translation movable plate 16 and the first conveying roller 17 move horizontally to the left, and the first conveying roller 17 moves away from the cable tensioning conveying roller 18, so as to increase the distance and tighten the multi-layer composite fire-resistant medium and high voltage cable. When the multi-layer composite fire-resistant medium and high voltage cable is in a taut state, the first conveying roller 17 continues to move horizontally to the left, and the generated tension acts on the multi-layer composite fire-resistant medium and high voltage cable, causing the cable tensioning conveying roller 18 to move upward until the movable gear 7 is separated from the bottom gear 8. At this time, the translation movable plate 16 and the first conveying roller 17 stop moving, and the cable tensioning conveying roller 18 keeps a certain distance from the bottom.

[0023] When the multi-layer composite fire-resistant medium and high voltage cable is in an over-tensioned state, the cable tensioning and conveying roller 18 moves upward, and when the rotating rod 6 is at the top of the movable slide 20, the movable gear 7 is engaged with the top No. 2 gear 14, and the movable gear 7 rotates counterclockwise to drive the top No. 2 gear 14, the gear connecting rod 13, and the top No. 1 gear 12 to rotate clockwise, and the top No. 1 gear 12 drives the top vertical gear 11 to rotate clockwise, and the top vertical gear 11 drives the bottom vertical gear 9 and the threaded rod body 15 to rotate clockwise through the transmission belt 10, and the threaded rod body 15 drives the translation movable plate 16 and the first conveying roller 17 to move horizontally to the right, and the first conveying roller 17 is close to the cable tensioning and conveying roller 18. When the multi-layer composite fire-resistant medium and high voltage cable is relaxed to a reasonable tension level, the translation movable plate 16 and the first conveying roller 17 continue to move to the right. At this time, the cable is relaxed and the installation The spring 4 prompts the cable tensioning conveying roller 18 to move downward until the bottom vertical gear 9 is separated from the top second gear 14. At this time, the cable tensioning conveying roller 18 has a certain distance from the top. The mutual cooperation between the first conveying roller 17, the cable tensioning conveying roller 18, and the second conveying roller 25 enables the cable to be tilted and conveyed in an alternating up and down manner. When the cable is tilted, the friction between the cable and the conveying roller can be increased, which helps to prevent the cable from slipping during the conveying process and improve the stability and accuracy of the conveying. At the same time, the up and down alternating conveying method can make efficient use of space and is convenient for coping with various production environments. The inclined conveying cable layout makes the spacing between the cables relatively large, which is convenient for operators to detect and maintain the cables. The staff can more conveniently observe the surface condition of the cable, check whether the connection parts are loose, etc., and promptly discover and deal with potential problems.

[0024] The present invention is provided with a two-stage tensioning mechanism, and constructs a dual tension adjustment guarantee system. The first-stage tensioning mechanism includes a limit rod body 3, a device spring 4, a spring connecting block 5, a rotating rod 6, a movable gear 7, and a cable tensioning and conveying roller 18. The second-stage tensioning mechanism includes a bottom gear 8, a bottom vertical gear 9, a transmission belt 10, a top vertical gear 11, a top first gear 12, a gear connecting rod 13, a top second gear 14, a threaded rod body 15, a translational movable plate 16, and a first conveying roller 17. When the cable is in a relaxed state, the device spring 4 in the first-stage tensioning mechanism prompts the cable tensioning and conveying roller 18 to move downward to tighten the cable. When the cable tensioning and conveying roller 18 is at the bottom, the movable gear 7 is engaged with the bottom gear 8, and the transmission mechanism is used to make the first conveying roller 17 in the second-stage tensioning mechanism move away from the first-stage tensioning mechanism. When the cable is straightened, the cable transmission drives the cable tensioning and conveying roller 18 to continue to rotate, and the first conveying roller 17 continues to move away from the first-stage tensioning mechanism. At this time, the cable tensioning and conveying roller 18 moves up until the movable gear 7 is in contact with the bottom gear 8. The gear 8 is separated, and the secondary tensioning mechanism can restore the primary tensioning mechanism to a reasonable tensioning range when working, leaving a certain warning space for the primary tensioning mechanism to prevent the primary tensioning mechanism from failing due to excessive tensioning or relaxation, making the entire tensioning system more stable and reliable, and ensuring that the cable is always in a suitable tensioning state. The reserved warning space enables the primary tensioning mechanism to respond to emergencies or minor changes in the production process, such as instantaneous fluctuations in cable speed, subtle differences in material properties, etc., so that the system has stronger adaptability. Reasonable tensioning range and warning space can avoid excessive stress on cables and tensioning mechanism components, reduce wear and fatigue, thereby extending the service life of cables and related equipment of the primary and secondary tensioning mechanisms, and reducing maintenance costs. Through the linkage cooperation of the primary and secondary tensioning mechanisms, the cable can be accurately positioned in the center of the extruder 26, eliminating the problem of uneven thickness of the fire-resistant layer 29 caused by cable deviation from the root, significantly improving the fire resistance and overall quality of multi-layer composite fire-resistant medium and high voltage cables, and providing stable and reliable tension control for cable production.

[0025] The device spring 4 is located between the tensioning structure bracket 2 and the spring connecting block 5. The device spring 4 plays the role of elastic support. The bottom gear 8 is rotatably connected to the tensioning structure bracket 2. A pair of bottom gears 8 are symmetrically arranged about the vertical center axis of the tensioning structure bracket 2. The top second gear 14 is rotatably connected to the tensioning structure bracket 2. The top second gear 14 is located at the top of the movable gear 7. A movable slide 20 is provided on the side of the tensioning structure bracket 2. The rotating rod 6 is located inside the movable slide 20. The movable slide 20 limits the rotating rod 6 to ensure the stability of the rotating rod 6 during the lifting process. To avoid deviation during the lifting process, an L-shaped support plate 21 runs through the side of the top vertical gear 11, and the L-shaped support plate 21 is fixedly connected to the tensioning structure bracket 2. The L-shaped support plate 21 is used to ensure the stable operation of the top vertical gear 11. One end of the threaded rod body 15 is movably connected to a threaded rod rotating shaft 22, and the outer wall of the threaded rod rotating shaft 22 is fixedly connected to a threaded rod base 23. The threaded rod base 23 is fixedly connected to the cable production equipment base 1, and the threaded rod body 15 is used to control the left and right movement of the translation movable plate 16, and the threaded rod base 23 is used to ensure the stable sliding of the translation movable plate 16.

[0026] In the layout of the entire cable production equipment, a wire reel 24 is provided on the side of the threaded rod base 23, and the wire reel 24 is fixedly connected to the cable production equipment base 1 to ensure that the wire reel 24 will not shake or displace during the cable pay-off process. The wire reel 24 is made of high-performance metal material and is equipped with a high-precision drive motor and control system inside. It can accurately control the cable pay-off speed according to production requirements to ensure that the cable enters the subsequent production links smoothly and orderly. A second conveying roller 25 is provided on the side of the cable tensioning conveying roller 18, and the second conveying roller 25 is fixedly connected to the cable production equipment base 1. The surface of the second conveying roller 25 has been specially treated and has good wear resistance and anti-slip properties, which can effectively prevent the cable from slipping during transmission. An extruder 26 is installed on the other side of the second conveying roller 25, and a cooler 27 is provided on the side of the extruder 26. A wire reel 28 is provided on the other side of the cooler 27, and the wire reel 28 is fixedly connected to the cable production equipment base 1.

[0027] When the device is in use, the outlet reel 24 performs the pay-off operation of the multi-layer composite fire-resistant medium and high voltage cable. The outlet reel 24 is a device for storing and releasing cables to ensure that they are orderly discharged during production, laying or use. The multi-layer composite fire-resistant medium and high voltage cable passes through the first conveying roller 17 and the cable tensioning conveying roller 18 to adjust the overall tension of the cable. The taut cable passes through the second conveying roller 25, so that the cable is in a horizontal state. When the cable enters the extruder 26, the extruder 26 is a device that pushes plastic and other materials forward in the barrel through the rotation of the screw, and is extruded from the head after heating and plasticizing. It is used to manufacture various plastic products or modify materials. The extruder 26 extrude the fire-resistant layer 29, and the fire-resistant layer 29 is evenly distributed on the surface of the cable. Then the cable wrapped with the fire-resistant layer 29 is The cable is cooled by the cooler 27 and then wound up by the wire reel 28. The cooler 27 is a device that uses the principle of heat exchange to cool high-temperature objects or media by air cooling, water cooling, etc. to meet the production process requirements or prevent the equipment from overheating. The wire reel 28 is a device used to collect finished cables during the cable production process. It is usually composed of parts such as a reel and a drive device. By precisely controlling the winding tension and the wiring method, the wire reel 28 can prevent the cable from being excessively stretched, twisted or squeezed during the winding process, thereby ensuring the structural integrity and electrical performance of the cable. Neat wiring is also conducive to reducing the risk of damage to the cable during storage and transportation. The cable is wound into a neat roll, which is convenient for packaging and labeling. It is also convenient for handling and transportation, saving storage space and improving logistics efficiency.

[0028] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A production equipment for multi-layer composite fire-resistant medium and high voltage cables, characterized in that: include: The top of the gear train is fixedly connected to the transmission gear of the present invention, and the transmission gear of the present invention is fixedly connected to the transmission gear of the present invention. The first gear is connected to the transmission gear of the present invention, and the transmission gear of the present invention is connected to the transmission gear of the present invention on the transmission gear of the present invention.

2. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that: The device spring is located between the tensioning structure support and the spring connecting block, and the device spring plays a role of elastic support.

3. The production equipment of multi-layer composite fire-resistant medium and high voltage cables according to claim 1, characterized in that: The bottom gear is rotationally connected to the tensioning structure support, and a pair of bottom gears are symmetrically arranged about the vertical center axis of the tensioning structure support.

4. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that: The top second gear is rotationally connected to the tensioning structure bracket, and the top second gear is located on the top of the movable gear.

5. The production equipment of multi-layer composite fire-resistant medium and high voltage cables according to claim 1, characterized in that: A movable sliding groove is provided on the side of the tensioning structure bracket, and the rotating rod is located inside the movable sliding groove.

6. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that: An L-shaped support plate passes through the side of the top vertical gear, and the L-shaped support plate is fixedly connected to the tensioning structure bracket.

7. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that: One end of the threaded rod body is movably connected to a threaded rod rotating shaft, an outer wall of the threaded rod rotating shaft is fixedly connected to a threaded rod base, and the threaded rod base is fixedly connected to the base of the cable production equipment.

8. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 7, characterized in that: A wire outlet reel is provided on the side of the threaded rod base, and the wire outlet reel is fixedly connected to the base of the cable production equipment.

9. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that: A second conveying roller is provided on the side of the cable tensioning conveying roller, and the second conveying roller is fixedly connected to the base of the cable production equipment. An extruder is installed on the other side of the second conveying roller, and a cooler is provided on the side of the extruder. A wire reel is provided on the other side of the cooler, and the wire reel is fixedly connected to the base of the cable production equipment.

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