Multi-layer composite fireproof middle-high voltage cable and production equipment thereof

Abstract

The invention provides a multi-layer composite fireproof middle-high voltage cable and production equipment thereof, and relates to the technical field of cable production. The cable tensioning device is provided with the second-stage tensioning mechanism, when a cable is in a loose state, a device spring in the first-stage tensioning mechanism promotes a cable tensioning conveying roller to move downwards to tighten the cable, when the cable tensioning conveying roller is located at the bottommost part, a movable gear is engaged with a bottom gear, and the cable is tensioned through a transmission mechanism. When the cable is straightened, the cable is conveyed to drive the tensioning conveying rollers to continue to rotate, the first conveying rollers continue to be far away from the first-stage tensioning mechanism, and at the moment, the cable tensioning conveying rollers move upwards until a movable gear is separated from a bottom gear; when the second-stage tensioning mechanism works, the first-stage tensioning mechanism can be restored to a reasonable tensioning interval, a certain early warning space is reserved for the first-stage tensioning mechanism, the cable is located at the center position in the extruder through the tensioning mechanism, and it is guaranteed that a fireproof layer is evenly distributed.

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 its production equipment. Background Art

[0002] A multi-layer composite fire-resistant medium and high voltage cable is a cable with a multi-layer structure that can work in a medium and high voltage environment and has fire-resistant performance. By combining multiple materials, it can 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 specific processes to manufacture a multi-layer structured cable with fire-resistant performance and suitable for medium and high voltage environments.

[0003] In Chinese Patent Publication No. CN218826370U, a utility model discloses an extrusion device for producing fire-resistant cables. Aiming at the problem that the existing cable core often lacks devices for cleaning dirt, water and preheating before entering the head, resulting in problems such as broken glue, air bubbles and air holes in the extruded cable, the following solution is proposed. It includes a wire laying machine, a traction tension machine, a plastic extrusion main machine, a head, an inspection machine, a cable core and a pre-treatment device. A square plate is installed on the pre-treatment device, and a scraping and filtering component, a cleaning component and two fixed seats are fixedly installed on the top of the square plate. A dust removal component is provided at the scraping and filtering component and the cleaning component. The utility model can reduce the situation of broken glue, air bubbles and air holes in the extruded cable, improve the quality of the extruded fire-resistant cable, and the setting of the dust collection component enables the removed dirt to be well recovered and processed, making the working environment of workers cleaner and more comfortable.

[0004] In the process of extruding the fire-resistant layer of the existing multi-layer composite fire-resistant medium and high voltage cable production equipment, a tension machine is provided 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 a certain limit. When the tensioning effect reaches the critical value, it is difficult for the cable 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 existing in 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] 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, including: a multi-layer composite fire-resistant medium and high voltage cable sheath layer, a fire-resistant layer is wrapped on the inner wall of the multi-layer composite fire-resistant medium and high voltage cable sheath layer, a composite layer is wrapped on the inner wall of the fire-resistant layer, and a conductor body is wrapped on the inner wall of the composite layer; a production device for manufacturing the above multi-layer composite fire-resistant medium and high voltage cable, including: a cable production device base, a tensioning structure bracket is fixedly connected to the top of the cable production device base, a limiting rod body penetrates through the inside of the tensioning structure bracket, a device spring is arranged on the outer wall of the limiting rod body, the top of the device spring is fixedly connected to a spring connection block, a rotating rod penetrates through the inside of the spring connection block, a movable gear is fixedly connected to the outer wall of the rotating rod, a bottom gear is engaged with the bottom of the movable gear, a bottom vertical gear is engaged with the outer wall of the bottom gear, a transmission belt is wound around the outer wall of the bottom vertical gear, a top vertical gear is wound around the top of the transmission belt, a top first gear is engaged with the outer wall of the top vertical gear, a gear connecting rod is fixedly connected to the side of the top first gear, a top second gear is fixedly connected to one end of the gear connecting rod, a threaded rod body is fixedly connected to the side of the bottom vertical gear, a translation movable plate is threadedly connected to the outer wall of the threaded rod body, a first conveying roller is movably connected to the side of the translation movable plate, and a cable tensioning and conveying roller is fixedly connected to one end of the rotating rod.

[0007] Preferably, the device spring is located between the tensioning structure bracket and the spring connection block, and the device spring plays an elastic support role.

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

[0009] Preferably, the top second gear is rotatably connected to the tensioning structure bracket, and the top second gear is located above the movable gear.

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

[0011] Preferably, an L-shaped support plate penetrates 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, and a threaded rod base is fixedly connected to the outer wall of the threaded rod rotating shaft, and the threaded rod base is fixedly connected to the cable production device base.

[0013] Preferably, a wire outlet coil is arranged on the side of the threaded rod base, and the wire outlet coil is fixedly connected to the cable production device base.

[0014] Preferably, a second conveying roller is provided on the side of the cable tension 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 conveying roller, a cooler is provided on the side of the extruder, and a take-up reel is provided on the other side of the cooler. The take-up reel is fixedly connected to the base of the cable production equipment.

[0016] Compared with the prior art, the beneficial effects of the present invention include: a secondary tensioning mechanism is provided to construct a dual tension adjustment guarantee system. When the cable is in a slack state, the device spring in the primary tensioning mechanism causes the cable tension conveying roller to move downward to tighten the cable. When the cable tension conveying roller is at the bottom, the movable gear meshes with the bottom gear, and through the transmission mechanism, the first conveying roller in the secondary tensioning mechanism moves away from the primary tensioning mechanism. When the cable is straightened, the cable conveying drives the cable tension conveying roller to continue rotating, and the first conveying roller continues to move away from the primary tensioning mechanism. At this time, the cable tension conveying roller moves upward until the movable gear separates from the bottom gear. When the secondary tensioning mechanism is working, it can make the primary tensioning mechanism return to a reasonable tension range, leaving a certain warning space for the primary tensioning mechanism. Through the linkage cooperation of the primary and secondary tensioning mechanisms, the cable can be accurately positioned at the center of the extruder, fundamentally eliminating the problem of uneven refractory layer thickness caused by cable deviation, significantly improving the fire resistance performance and overall quality of the multi-layer composite fire-resistant medium-voltage cable, and providing stable and reliable tension control for cable production. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Reference numerals in the figure: 1, base of cable production equipment; 2, tensioning structure bracket; 3, limiting rod body; 4, device spring; 5, spring connection block; 6, rotating rod; 7, movable gear; 8, bottom gear; 9, bottom vertical gear; 10, transmission belt; 11, top vertical gear; 12, top first gear; 13, gear connecting rod; 14, top second gear; 15, threaded rod body; 16, translation movable plate; 17, first conveying roller; 18, cable tensioning conveying roller; 19, multi-layer composite fire-resistant medium and high-voltage cable sheath layer; 20, movable chute; 21, L-shaped support plate; 22, threaded rod rotating shaft; 23, threaded rod base; 24, wire outlet coil; 25, second conveying roller; 26, extruder; 27, cooler; 28, take-up coil; 29, fire-resistant layer; 30, composite layer; 31, conductor body. Detailed implementation manners

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural ways and implementation ways. Therefore, the following detailed implementation manners and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0020] Combined with the embodiments of the present invention Figures 1 to 10 Shown.

[0021] During the production process of the cable, it is necessary to add the fire-resistant layer 29 through the extruder 26. The extruder 26 can accurately extrude the fire-resistant material according to the set parameters and wrap it around the cable core. The fire-resistant material can withstand high temperatures for a certain period of time, protecting the internal structure of the cable, such as the conductor and the insulating layer, from the direct damage of the flame and high temperature, 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 the fire. In the production equipment of the existing multi-layer composite fire-resistant medium-voltage cable, during the extrusion of the fire-resistant layer 29 of the cable, a tension machine is arranged at the front end of the extruder 26. The tension machine keeps the cable in a stable tension state, prompting the cable to be in the central position inside the extruder 26 and ensuring the uniform distribution of the fire-resistant layer 29 on the cable. However, the tensioning effect of the tension machine has a certain limit. When the tensioning effect reaches the critical value, the tension of the cable changes, and it is difficult for the cable to be in the central position inside the extruder 26, resulting in the uneven distribution of the fire-resistant layer 29 of the cable and affecting the product qualification rate of the cable. To solve this problem, the present invention is designed as follows: A multi-layer composite fire-resistant medium-voltage cable, including: a multi-layer composite fire-resistant medium-voltage cable sheath layer 19. The inner wall of the multi-layer composite fire-resistant medium-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 materials with fire-resistant properties in the cable structure. Its function is to protect the internal conductor and insulating layer and other structures of the cable in a high-temperature environment such as a fire, ensuring 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 formed by combining two or more different materials through a specific process and wrapped outside the cable core or insulating 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 composed of multiple fine wires stranded together. This stranded structure has good flexibility, facilitating the bending and laying of the cable. At the same time, it can also increase the strength of the cable and reduce the risk of fracture caused by metal fatigue. The inner core body of the conductor is the core part of the cable for transmitting current or signals;Production equipment for manufacturing the above-mentioned multi-layer composite refractory medium and high voltage cables, comprising: a cable production equipment base 1, the cable production equipment base 1 is used to install the accessories required for the entire production equipment, a tensioning structure bracket 2 is fixedly connected to the top of the cable production equipment base 1, the tensioning structure bracket 2 is used to provide stable support for the tensioning component, a limiting rod body 3 penetrates through the inside of the tensioning structure bracket 2, a device spring 4 is arranged on the outer wall of the limiting rod body 3, the device spring 4 plays an elastic support role to ensure the intelligent adjustment of the tensioning mechanism, a spring connection block 5 is fixedly connected to the top of the device spring 4, a rotating rod 6 penetrates through the inside of the spring connection block 5, the rotating rod 6 plays a limiting role, so that the cable tensioning conveying roller 18 can only move in the vertical direction, a movable gear 7 is fixedly connected to the outer wall of the rotating rod 6, a bottom gear 8 is engaged with the bottom of the movable gear 7, a bottom vertical gear 9 is engaged with the outer wall of the bottom gear 8, a transmission belt 10 is wound around the outer wall of the bottom vertical gear 9, a top vertical gear 11 is wound around the top of the transmission belt 10, a top first gear 12 is engaged with the outer wall of the top vertical gear 11, a gear connecting rod 13 is fixedly connected to the side of the top first gear 12, a top second gear 14 is fixedly connected to one end of the gear connecting rod 13, a threaded rod body 15 is fixedly connected to the side of the bottom vertical gear 9, a translation movable plate 16 is threadedly connected to the outer wall of the threaded rod body 15, a first conveying roller 17 is movably connected to the side of the translation movable plate 16, a cable tensioning conveying roller 18 is fixedly connected to one end of the rotating rod 6, the threaded rod body 15 is used to control the movement of the first conveying roller 17 in the horizontal direction and plays a role of 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 adding the fire-resistant layer 29, the multi-layer composite fire-resistant medium and high-voltage cable is conveyed in the entire production equipment. When the multi-layer composite fire-resistant medium and high-voltage cable is in a relaxed state, at this time, the device spring 4 pulls the spring connection block 5 downward, and the limit rod body 3 plays a limiting role. When the spring connection block 5 moves downward, the rotating rod 6 moves downward inside the movable chute 20. During the cable conveying process, it drives the cable tensioning conveyor roller 18 to rotate counterclockwise. When the rotating rod 6 is at the bottom of the movable chute 20, at this time, the movable gear 7 and the bottom gear 8 are engaged together. The movable gear 7 rotates counterclockwise to drive the bottom gear 8 to rotate clockwise. 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 conveyor roller 17 move horizontally to the left. The first conveyor roller 17 moves away from the cable tensioning conveyor roller 18 to tighten the multi-layer composite fire-resistant medium and high-voltage cable by increasing the distance. When the multi-layer composite fire-resistant medium and high-voltage cable is in a tight state, at this time, the first conveyor roller 17 continues to move horizontally to the left, and the generated pulling force acts on the multi-layer composite fire-resistant medium and high-voltage cable, causing the cable tensioning conveyor 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 conveyor roller 17 stop moving, and there is a certain distance left between the cable tensioning conveyor roller 18 and the bottom.

[0023] When the multi-layer composite fire-resistant medium-voltage cable is in an over-tight state, the cable tension conveying roller 18 moves upward at this time. When the rotating rod 6 is located at the top of the movable chute 20, the movable gear 7 meshes with the top second gear 14 at this time. The movable gear 7 rotates counterclockwise to drive the top second gear 14, the gear connecting rod 13, and the top first gear 12 to rotate clockwise. The top first gear 12 drives the top vertical gear 11 to rotate clockwise. 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. The threaded rod body 15 drives the translation movable plate 16 and the first conveying roller 17 to move horizontally to the right. The first conveying roller 17 approaches the cable tension conveying roller 18. When the multi-layer composite fire-resistant medium-voltage cable is loosened 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. At this time, the cable is loosened, and the device spring 4 prompts the cable tension conveying roller 18 to move downward until the bottom vertical gear 9 is separated from the top second gear 14. At this time, there is a certain distance left between the cable tension conveying roller 18 and the top. The mutual cooperation among the first conveying roller 17, the cable tension conveying roller 18, and the second conveying roller 25 enables the cable to be obliquely conveyed in an up-and-down alternating manner. When the cable is obliquely conveyed, the friction between the cable and the conveying roller can be increased, which helps to prevent the cable from slipping during the conveying process, improving the stability and accuracy of the conveying. At the same time, the up-and-down alternating conveying method can efficiently utilize the space, facilitating the adaptation to various production environments. The layout of the obliquely conveyed cable makes the distance between the cables relatively large, facilitating the operation personnel to detect and maintain the cables. The staff can more conveniently observe the surface condition of the cables, check whether the connection parts are loose, etc., and timely discover and handle potential problems.

[0024] The present invention is provided with a secondary tensioning mechanism, constructing a dual tension adjustment guarantee system. The primary tensioning mechanism includes a limit rod body 3, a device spring 4, a spring connection block 5, a rotating rod 6, a movable gear 7, and a cable tensioning and conveying roller 18. The secondary 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 translation movable plate 16, and a first conveying roller 17. When the cable is in a slack state, at this time, the device spring 4 in the primary tensioning mechanism causes 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 bottommost position, at this time, the movable gear 7 meshes with the bottom gear 8. Through the transmission mechanism, the first conveying roller 17 in the secondary tensioning mechanism moves away from the primary tensioning mechanism. When the cable is straightened, the cable conveying drives the cable tensioning and conveying roller 18 to continue rotating, and the first conveying roller 17 continues to move away from the primary tensioning mechanism. At this time, the cable tensioning and conveying roller 18 moves upward until the movable gear 7 separates from the bottom gear 8. When the secondary tensioning mechanism is working, it can make the primary tensioning mechanism return to a reasonable tensioning range, leaving a certain warning space for the primary tensioning mechanism, preventing the primary tensioning mechanism from failing due to excessive tension or slack, making the entire tensioning system more stable and reliable, ensuring that the cable is always in a suitable tensioning state. The reserved warning space enables the primary tensioning mechanism to cope with sudden situations or minor changes in the production process, such as instantaneous fluctuations in cable speed, subtle differences in material properties, etc., making the system more adaptable. The reasonable tensioning range and warning space can avoid excessive stress on the cable and tensioning mechanism components, reduce wear and fatigue, thereby extending the service life of the cable and related equipment of the primary and secondary tensioning mechanisms, reducing maintenance costs. Through the linkage cooperation of the primary and secondary tensioning mechanisms, the cable can be accurately positioned at the center of the extruder 26, fundamentally eliminating the problem of uneven thickness of the refractory layer 29 caused by cable deviation, significantly improving the fire resistance performance and overall quality of the multi-layer composite fire-resistant medium-voltage cable, 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 connection block 5. The device spring 4 plays an elastic support role. 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 central 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 above the movable gear 7. An activity chute 20 is formed on the side of the tensioning structure bracket 2. The rotating rod 6 is located inside the activity chute 20. The activity chute 20 plays a limiting role on the rotating rod 6 to ensure the stability of the rotating rod 6 during the lifting process and prevent deviation during the lifting process. The side of the top vertical gear 11 penetrates through an L-shaped support plate 21. 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. 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. The threaded rod body 15 is used to control the left and right movement of the translation movable plate 16. The threaded rod base 23 is used to ensure the stable sliding of the translation movable plate 16.

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

[0027] When the device is in use, the outgoing cable reel 24 pays out the multi-layer composite fire-resistant medium-voltage cable. The outgoing cable reel 24 is a device for storing and releasing the cable to ensure orderly payout during production, laying, or use. The multi-layer composite fire-resistant medium-voltage cable passes through the first conveying roller 17 and the cable tensioning and conveying roller 18 to adjust the overall tension of the cable. The cable in a taut state passes through the second conveying roller 25, making the cable in a horizontal state. When the cable enters the extruder 26, the extruder 26 is a device that uses the rotation of a screw to push materials such as plastic forward in the barrel, and after heating and plasticization, it is extruded from the die head to form various plastic products or modify materials. The extruder 26 extrudes the fire-resistant layer 29, and the fire-resistant layer 29 is evenly distributed on the surface of the cable. Subsequently, the cable wrapped with the fire-resistant layer 29 is cooled by the cooler 27 and then wound up by the take-up reel 28. The cooler 27 is a device that uses the principle of heat exchange to cool high-temperature objects or media through air cooling, water cooling, etc. to meet the production process requirements or prevent equipment overheating. The take-up reel 28 is a device for collecting the finished cable during the cable production process, usually composed of a reel and a driving device, etc. By precisely controlling the winding tension and the wire laying method, the take-up reel 28 can avoid excessive stretching, twisting, or extrusion of the cable during winding, thus ensuring the structural integrity and electrical performance of the cable. Neat wire laying is also beneficial to reducing the risk of damage to the cable during storage and transportation, winding the cable into a neat coil, facilitating packaging and identification, and also being 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 content described above. 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 device for a multi-layer composite fire-resistant medium and high voltage cable, characterized in that, Including: The base of the cable production equipment, on the top of which is fixedly connected with a tensioning structure bracket. A limiting rod body penetrates through the inside of the tensioning structure bracket. A device spring is arranged on the outer wall of the limiting rod body. The top of the device spring is fixedly connected with a spring connecting block. A rotating rod penetrates through the inside of the spring connecting block. An active gear is fixedly connected to the outer wall of the rotating rod. A bottom gear is meshed with the bottom of the active gear. A bottom vertical gear is meshed with the outer wall of the bottom gear. A transmission belt is wound around the outer wall of the bottom vertical gear. A top vertical gear is wound around the top of the transmission belt. A top first gear is meshed with the outer wall of the top vertical gear. A gear connecting rod is fixedly connected to the side of the top first gear. One end of the gear connecting rod is fixedly connected with a top second gear. A threaded rod body is fixedly connected to the side of the bottom vertical gear. A translation movable plate is threadedly connected to the outer wall of the threaded rod body. A first conveying roller is movably connected to the side of the translation movable plate. One end of the rotating rod is fixedly connected with a cable tensioning conveying roller.

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

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

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 rotatably connected to the tensioning structure bracket, and the top second gear is located above the active gear.

5. The production equipment of the multi-layer composite fire-resistant medium and high voltage cable according to claim 1, characterized in that, An activity chute is formed on the side of the tensioning structure bracket, and the rotating rod is located inside the activity chute.

6. The production equipment of the multi-layer composite fire-resistant medium-high voltage cable according to claim 1, characterized in that, An L-shaped support plate penetrates 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 with a threaded rod rotating shaft, and a threaded rod base is fixedly connected to the outer wall of the threaded rod rotating shaft. 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 arranged 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-high voltage cable according to claim 1, characterized in that, A second conveying roller is arranged on the side of the cable tensioning conveying roller. 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. A cooler is arranged on the side of the extruder. A wire take-up reel is arranged on the other side of the cooler. The wire take-up reel is fixedly connected to the base of the cable production equipment.

10. A cable produced by the production equipment of the multi-layer composite fire-resistant medium-voltage cable according to any one of claims 1-9, characterized in that, Including: A multi-layer composite fire-resistant medium and high voltage cable sheath layer. A fire-resistant layer is wrapped on the inner wall of the multi-layer composite fire-resistant medium and high voltage cable sheath layer. A composite layer is wrapped on the inner wall of the fire-resistant layer. A conductor body is wrapped on the inner wall of the composite layer.

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