An aerial cable with high wear resistance and high flame resistance

Abstract

This invention relates to the field of overhead cable technology, specifically to an overhead cable with high wear resistance and high flame retardancy. The cable includes a wire, and its outer surface is fitted with multiple sets of protective shells spaced axially. Each set of protective shells consists of two symmetrically arranged half-shells that interlock to cover the outside of the cable. Two support legs are provided axially on the side of each protective shell that is close to the other. This invention achieves precise positioning and installation by setting a segmented protective structure composed of protective shells on the outside of the cable, and using node sleeves, ensuring that each protective unit is evenly distributed along the cable's axial direction. Simultaneously, the protective shells are made of wear-resistant and flame-retardant materials and have a streamlined structural design, effectively resisting wind and sand erosion, external friction, and fire attack. This solves the problems of poor wear resistance and insufficient flame retardancy of existing overhead cable sheaths, thereby significantly improving the cable's environmental adaptability and operational safety.

Description

Technical Field

[0001] This invention relates to the field of overhead cable technology, specifically to an overhead cable with high wear resistance and high flame retardancy. Background Technology

[0002] With the increasing demand for electricity in field resource exploration, border monitoring, and high-altitude areas, near-ground overhead cables are increasingly widely used in special geographical environments due to their advantages such as convenient installation and lower maintenance costs compared to buried cables. However, in some industrial areas or forested areas, overhead cables may also face mechanical friction, suspension vibration, and repeated contact with external objects such as branches and buildings. These factors will exacerbate the wear on the cable surface. Once the cable sheath is worn or even damaged, the internal conductor or insulation layer will be exposed, which can easily lead to safety hazards such as short circuits and leakage, and in severe cases, may even cause fire accidents. During the actual laying of cables in soft soil or gravel areas, some overhead cables, when used in low-lying or complex terrain areas, lack effective support and buffer structures. They are prone to significant sagging due to their own weight or external additional loads (such as icing, snow accumulation, etc.), leading to local stress concentration, which in turn causes sheath damage or structural fatigue. Existing technologies mostly use fixed or rigid support methods, which are difficult to adaptively adjust according to load changes and cannot effectively alleviate the problem of uneven stress, thereby affecting the service life and operational stability of the cable. Therefore, this application proposes an overhead cable with high wear resistance and high flame retardancy. Summary of the Invention

[0003] The purpose of this invention is to provide an overhead cable with high wear resistance and high flame retardancy to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an overhead cable with high wear resistance and high flame retardancy, comprising a cable, wherein multiple sets of protective shells are axially spaced on the outer surface of the cable, each set of protective shells consists of two symmetrically arranged half-shells, the two half-shells interlocking to cover the outside of the cable, and two support legs are provided axially on the side of each protective shell that is close to each other, the support legs being arranged axially along the protective shell, and universal joints being fixedly installed at corresponding ends of each protective shell, the two support legs being connected to the universal joints. The cable is movably connected to the axis. By adjusting the swing angle of the support legs, it can be extended to form an angle with the protective shell. Each of the two protective shells has a wire clamp at one end corresponding to the other. The upper ends of the two wire clamps are rotatably connected, allowing them to open and close around the cable. The inner side of the wire clamp is in contact with the outer surface of the cable for clamping and positioning the cable. A support shaft is fixedly installed on the outer surface of each wire clamp. The end of the support shaft away from the wire clamp passes through the protective shell and extends to its outer side. The protective shell is sleeved on the outside of the support shaft and its position can be adjusted along its axial direction.

[0005] As a further embodiment of the present invention, the outer surface of the cable is fixedly fitted with a plurality of inner support cylinders, the plurality of inner support cylinders are evenly spaced along the axial direction of the cable, the spacing between adjacent inner support cylinders is equal, the outer surface of the inner support cylinder is fixedly fitted with a node sleeve, the inside of the cable is provided with a conductor core, and a plurality of cold shrink strips are arranged around the outside of the conductor core, the plurality of cold shrink strips are evenly arranged in a ring and cover the outer periphery of the conductor core.

[0006] As a further embodiment of the present invention, the outer surface of the inner support cylinder is provided with multiple traction plates. The traction plates are fixedly connected to the cold shrink strip. The traction plates are set in two groups, and the two groups of traction plates are arranged radially opposite each other, with their ends away from the cold shrink strip corresponding to each other. By setting the traction plates into two groups of structures that are symmetrically distributed radially and fixedly connected to the cold shrink strip, a balanced and stable force transmission path can be formed when the cold shrink strip shrinks, so that the shrinkage force is transmitted synchronously in the relative direction, avoiding structural displacement or jamming caused by unilateral force.

[0007] As a further embodiment of the present invention, the surface of the line clip and the node sleeve are provided with multiple rectangular holes, and two sets of rectangular holes correspond to each other. A traction block is slidably installed in the rectangular hole on the surface of the line clip. The traction block slides back and forth along the extension direction of the rectangular hole. After passing through the rectangular hole on the node sleeve, the traction block contacts the traction plate.

[0008] As a further embodiment of the present invention, a guide rod is inserted inside the support leg, and the guide rod is elastically connected to the support leg by a support spring. A heat-conducting pipe is fixedly installed at the inner end of the support leg, the support spring is sleeved outside the heat-conducting pipe, and the end of the heat-conducting pipe extends and passes through the inside of the guide rod to form a stable heat-conducting and support structure.

[0009] As a further embodiment of the present invention, a conductive tube is fixedly installed at the inner end of the guide rod, and the end of the guide rod away from the support leg is set as a tapered structure so as to facilitate the insertion of the guide rod into the underground soil layer. A movable shell is slidably arranged inside the heat-conducting tube along the axial direction, and the movable shell can move axially back and forth inside the heat-conducting tube.

[0010] As a further embodiment of the present invention, the circumferential surface of the movable shell is provided with a plurality of locking latches in a ring array, and the sidewall of the heat-conducting pipe is provided with a plurality of rectangular holes at corresponding positions. The rectangular holes are located on the right side of the heat-conducting pipe, and each rectangular hole corresponds to a locking latch. The locking latches pass through the rectangular holes and extend outward of the heat-conducting pipe to limit the guide rod. The movable shell and the heat-conducting pipe are connected by a return spring, and a passive shaft is rotatably mounted on the inner end of the movable shell.

[0011] As a further embodiment of the present invention, multiple guide posts are fixedly arranged on the outer periphery of the passive shaft. Each guide post is connected to a corresponding locking latch by a traction rope. When the passive shaft rotates, the traction rope synchronously pulls each locking latch toward the passive shaft, thereby causing the locking latch to disengage from the rectangular hole or retract into the heat-conducting tube, thus releasing the guide rod from its position.

[0012] As a further embodiment of the present invention, a passive sleeve is provided at the end of the movable shell away from the guide rod. The passive sleeve is fitted onto the surface of the passive shaft. A guide groove is provided at the end of the passive sleeve. The guide post is located inside the guide groove and slides in cooperation with it.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention sets up a segmented protective structure consisting of a protective shell on the outside of the cable and uses node sleeves to achieve precise positioning and installation, so that each protective unit is evenly distributed along the cable axis; at the same time, the protective shell is made of wear-resistant and flame-retardant material and has a streamlined structure design, which can effectively resist wind and sand erosion, friction from foreign objects and fire source attack, solving the problems of poor wear resistance and insufficient flame retardant performance of existing overhead cable sheaths, thereby significantly improving the environmental adaptability and operational safety of the cable; 2. This invention uses a support adjustment structure consisting of support legs, guide rods, and support springs to enable the cable to maintain a certain distance from the ground after installation, and to achieve elastic buffering and height self-adjustment when external loads change (such as icing). Compared with the existing rigid support method, it can effectively reduce stress concentration and avoid sheath cracking or structural damage to the cable due to long-term uneven stress, thereby extending its service life. 3. By setting a conductive cavity and volatile liquid inside the guide rod and forming a phase change heat circulation structure with the conductive tube, the present invention can utilize the heat of the underground constant temperature layer to continuously heat the support leg and heat conduction pipe, which solves the problem that the support structure is prone to freezing, jamming or even failure in severe cold environment in the prior art, and significantly improves the reliability and stability of the device in low temperature environment. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an overhead cable. Figure 2 A schematic diagram of the disassembled structure inside the protective shell; Figure 3 This is a schematic diagram of the internal structure of the cable. Figure 4 This is a structural diagram of the junction box and the protective shell. Figure 5 This is a schematic diagram of the internal structure of the supporting leg; Figure 6 This is a schematic diagram of the internal structure of the heat pipe and guide rod. Figure 7 This is a schematic diagram of the internal structure of the movable shell; Figure 8 This is a disassembled structural diagram of the internal structure of the movable shell. Figure 9 This is a simplified diagram of the actual installation of the present invention; Figure 10 This is a simplified diagram of the force state of air passing through the protective shell.

[0015] In the diagram: 1. Cable; 2. Protective shell; 21. Node sleeve; 22. Inner support cylinder; 23. Traction plate; 24. Cold shrink strip; 25. Wire core; 101. Support shaft; 102. Cable clamp; 103. Universal joint; 104. Traction block; 105. Guide wire; 106. Guide ring; 201. Support leg; 202. Guide rod; 203. Heat pipe; 204. Support spring; 205. Return spring; 206. Movable shell; 207. Conductive tube; 208. Conductive cavity; 209. Passive sleeve; 210. Locking latch; 211. Traction rope; 212. Auxiliary spring; 213. Guide post; 214. Passive shaft; 215. Guide groove. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: Please refer to Figures 1-3 , Figure 9 , Figure 10 An overhead cable with high wear resistance and high flame retardancy includes a cable 1. Multiple sets of protective shells 2 are axially spaced on the outer surface of the cable 1. Each set of protective shells 2 consists of two symmetrically arranged half shells. The two half shells are interlocked to cover the outside of the cable 1. The protective shells 2 are preferably made of wear-resistant and flame-retardant composite materials to improve their comprehensive protection performance under wind and sand erosion, external friction and fire. Two support legs 201 are arranged axially on the side of the protective shells 2 that are close to each other. The support legs 201 are arranged axially along the protective shells 2. Universal shafts 103 are fixedly installed on the corresponding ends of the protective shells 2. Two support legs 201 are movably connected to the universal joint 103. By adjusting the swing angle of the support legs 201, they can be extended to form an angle with the protective shell 2, preferably in a vertical state. When all four support legs 201 are fully extended, they can form a stable support structure for the protective shell 2, thereby supporting the cable 1 as a whole to be a certain distance away from the ground, reducing the direct impact of ground moisture, freezing and debris on the cable 1, and reducing the risk of wear. Preferably, the protective shell 2 has an asymmetrical elliptical streamlined structure, with its windward edge designed as a flat and slightly sharp wedge-shaped diversion guide. The outer surface is smooth. When natural wind blows towards the protective shell 2, this wedge-shaped structure horizontally cuts the airflow, forcing it to be diverted to the upper and lower surfaces of the protective shell 2. Because the curvature of the upper surface of the protective shell 2 is greater than that of the lower surface (i.e., the upper surface has a longer path), according to Bernoulli's principle, the airflow velocity on the upper surface will be higher than that on the lower surface, thus creating a pressure difference between the upper and lower surfaces of the protective shell 2. The air will then exert an upward reaction force on the protective shell 2, partially offsetting the weight of the cable 1 itself and the weight of frost or ice cones adhering in cold environments. This reduces the sag of the cable 1 and the stress concentration at the support points, improving structural stability and service life (e.g., Figure 10 (as shown) Two protective shells 2 are each provided with a wire clip 102 at one end of each other. The upper ends of the two wire clips 102 are rotatably connected by a pivot, so that they can open and close around the cable 1. The inner side of the wire clip 102 is in contact with the outer surface of the cable 1 for clamping and positioning the cable 1. A support shaft 101 is fixedly installed on the outer surface of each wire clip 102. The end of the support shaft 101 away from the wire clip 102 passes through the protective shell 2 and extends to its outer side. The protective shell 2 is sleeved on the outside of the support shaft 101 and its position is adjusted along its axis. At the same time, the protective shell 2 and the support shaft 101 are not tightly connected, so that it can adapt to the swing angle of the support leg 201. Furthermore, the bottom of the two line clips 102 are provided with locking buckles. When the two line clips 102 are closed and cover the outside of the cable 1, they are quickly locked by the locking buckles, thereby achieving stable installation of the protective shell 2 on the cable 1. The locking buckles can adopt existing mature buckle structures or self-locking structures, and their specific forms are not limited here.

[0018] like Figures 2-4As shown, multiple inner support cylinders 22 are fixedly sleeved on the outer surface of the cable 1. The multiple inner support cylinders 22 are evenly spaced along the axial direction of the cable 1, and the spacing between adjacent inner support cylinders 22 is equal to form a regular stress node structure. Node sleeves 21 are fixedly sleeved on the outer surface of the inner support cylinders 22. Node sleeves 21 are installation and positioning components. When two wire clips 102 are closed and cover the outer surface of the node sleeve 21, the protective shell 2 is quickly positioned and installed on the cable 1. Therefore, the location of the node sleeve 21 is the setting position of the protective shell 2, thereby ensuring that each group of protective structures is evenly distributed along the axial direction of the cable 1 and improving the consistency of the overall protective effect. The cable 1 has a conductor core 25 inside, which is preferably distributed in a multi-strand ring. Multiple cold shrink strips 24 are arranged around the outside of the conductor core 25. The multiple cold shrink strips 24 are evenly arranged in a ring and cover the outer periphery of the conductor core 25. The cold shrink strips 24 are made of high-sensitivity shape memory alloy (SMA), which can shrink and wrinkle in low-temperature environment, thereby producing a radial tightening effect. The outer surface of the inner support cylinder 22 is provided with multiple traction plates 23. The traction plates 23 are fixedly connected to the cold shrink strip 24 and are used to convert the deformation of the cold shrink strip 24 into external mechanical displacement. Since the inner support cylinder 22 is arranged along the outer surface of the cable 1, in order to achieve stable force transmission, the traction plates 23 are set in two groups, and the two groups of traction plates 23 are arranged radially opposite each other, with their ends away from the cold shrink strip 24 corresponding to each other, thereby forming a symmetrical force structure and ensuring transmission balance. Both the wire clip 102 and the node sleeve 21 have multiple rectangular holes on their surfaces. Two sets of rectangular holes correspond to each other. A traction block 104 is slidably installed in the rectangular holes on the surface of the wire clip 102. The traction block 104 slides back and forth along the extension direction of the rectangular holes. After passing through the rectangular holes on the node sleeve 21, the traction block 104 contacts the traction plate 23. Specifically, a protrusion is fixedly provided at the end of the traction plate 23 away from the cold shrink strip 24. The protrusion abuts against the inner surface of the traction block 104. When the ambient temperature decreases, the cold shrink strip 24 shrinks and drives the traction plate 23 to move inward. At this time, the protrusion at the end of the traction plate 23 pushes the traction block 104 to slide synchronously.

[0019] Example 2: Please refer to Figures 5-7 An overhead cable with high wear resistance and high flame retardancy is based on Embodiment 1. A guide rod 202 is inserted inside the support leg 201. The guide rod 202 and the support leg 201 are elastically connected by a support spring 204 so that the guide rod 202 has axial buffering and adaptive extension and retraction capability relative to the support leg 201. A heat conduction pipe 203 is fixedly installed at the inner end of the support leg 201. The support spring 204 is sleeved on the outside of the heat conduction pipe 203, and the end of the heat conduction pipe 203 extends and passes through the inside of the guide rod 202 to form a stable heat conduction and support structure. A conductive tube 207 is fixedly installed at the inner end of the guide rod 202. A closed conductive cavity 208 is formed between the conductive tube 207 and the inner wall of the guide rod 202. Both the conductive cavity 208 and the conductive tube 207 are filled with inert gas to improve heat transfer efficiency and prevent oxidation or deterioration of the internal medium. The guide rod 202 is also sealed and filled with a volatile liquid, preferably ammonia, ethanol or other refrigerants suitable for low-temperature environments, to form a phase change heat exchange system. The inner wall of the conductive tube 207 is provided with a capillary structure so that the liquid return is no longer completely dependent on gravity, thereby increasing the heat exchange efficiency. The end of the guide rod 202 away from the support leg 201 is set as a conical structure, and the conduction cavity 208 extends at least partially to the conical end region, so that the guide rod 202 can be inserted into the underground soil layer and come into contact with the relatively stable underground temperature environment. During use, the conical end buried underground absorbs the heat of the underground constant temperature layer, causing the volatile liquid inside the guide rod 202 to vaporize. The vaporized gas rises along the conduction pipe 207 to a lower temperature region, where it condenses and releases heat, and then flows back into the evaporation zone, thus forming a continuous gas-liquid phase change heat cycle. This effectively prevents the internal structure and connecting parts of the support leg 201 from freezing, jamming, or "freezing" due to low temperature in cold environments, ensuring that the support leg 201 and its connected protective shell 2 still have good adjustment capabilities and mechanical response performance under low temperature conditions. Furthermore, the length of the guide rod 202 can be selected according to the depth of frozen soil and the distribution of underground temperature in different regions to ensure that it can effectively reach the soil layer area with relatively stable temperature, thereby achieving adaptability and reliability under different climatic conditions. Preferably, the heat pipe 203 is made of a high thermal conductivity material and is in close contact with the inner wall of the support leg 201 to improve the heat conduction efficiency to the overall structure of the support leg 201; at the same time, the support spring 204 provides elastic support and can also buffer the structural stress caused by thermal expansion and contraction, further improving the long-term stability of the device in complex environments.

[0020] like Figures 6-8 As shown, a movable shell 206 is axially slidably disposed inside the heat pipe 203. The movable shell 206 can reciprocate axially within the heat pipe 203. Multiple locking latches 210 are arranged in a ring array on the circumferential surface of the movable shell 206. Multiple rectangular holes are correspondingly formed on the sidewall of the heat pipe 203, located on the right side of the heat pipe 203. Each rectangular hole corresponds to a locking latch 210. The locking latches 210 pass through the rectangular holes and extend outward from the outside of the heat pipe 203 to limit the guide rod 202 (e.g., ...). Figure 7 As shown), when the guide rod 202 is inside the support leg 201, the heat pipe 203 is sleeved on the surface of the conduction pipe 207, and the conduction pipe 207 pushes the movable shell 206 to the left side of the heat pipe 203. The locking latch 210 has a beveled guide at its edge, which allows unidirectional overload sliding in the incomplete unlocked state. When the load exceeds the preload of the auxiliary spring 212, the locking latch 210 is retracted by force. When the load is unloaded and the movable housing 206 is reset, the locking latch 210 is re-embedded into the rectangular hole along the beveled guide under the elastic drive of the auxiliary spring 212 to achieve secondary locking. The locking latch 210 is connected to the movable shell 206 by an auxiliary spring 212, and the movable shell 206 is connected to the heat pipe 203 by a return spring 205. The inner end of the movable shell 206 is rotatably mounted with a passive shaft 214. Multiple guide posts 213 are fixedly arranged on the outer periphery of the passive shaft 214. Each guide post 213 is connected to the corresponding locking latch 210 by a traction rope 211. When the passive shaft 214 rotates, the traction rope 211 synchronously pulls each locking latch 210 to retract towards the passive shaft 214, thereby causing the locking latch 210 to disengage from the rectangular hole or retract into the heat pipe 203, thus releasing the guide rod 202 from its limit. A passive sleeve 209 is provided at the end of the movable shell 206 away from the guide rod 202. The passive sleeve 209 is sleeved on the surface of the passive shaft 214. A guide groove 215 is provided at the end of the passive sleeve 209. The guide post 213 is located inside the guide groove 215 and slides with it. Specifically, the guide groove 215 is inclined. When the passive sleeve 209 moves axially, the guide post 213 slides in the guide groove 215, thereby driving the passive shaft 214 to rotate, realizing the conversion of "axial displacement - rotational motion". Furthermore, a rectangular slide groove is provided on the outer surface of the passive sleeve 209, and a rectangular block is fixedly provided at the corresponding position on the inner wall of the movable shell 206. The rectangular block is embedded in the rectangular slide groove and slides with it, thereby limiting the passive sleeve 209 and preventing it from rotating during axial movement. Furthermore, the inner wall of the heat pipe 203 is provided with a strip-shaped groove along the axial direction, and the strip-shaped groove extends to the rectangular hole on the side wall of the heat pipe 203; the inner end of the locking latch 210 is slidably disposed in the strip-shaped groove, thereby providing guiding constraint to the locking latch 210 when the movable shell 206 moves axially, preventing the locking latch 210 from circumferentially deflecting or jamming, and at the same time preventing the movable shell 206 from rotating inside the heat pipe 203.

[0021] like Figure 4 , Figure 7As shown, a guide ring 106 is rotatably mounted on the surface of the wire clip 102, and guide wires 105 are fixedly connected to the surface of the traction block 104. The guide wires 105 are guided by the guide ring 106 and pass through the heat pipe 203 on the side corresponding to the current traction block 104 and are fixedly connected to the passive sleeve 209. The guide ring 106 is used to guide and limit the guide wires 105 to reduce their friction and bending stress during movement. The guide wires 105 are made of metal with high thermal conductivity. To prevent the cable 1 from sag due to its own weight during normal use and causing malfunctions to the mechanism, the guide wire 105 is set to a relaxed state. That is, in the initial state, the guide wire 105 does not apply tension to the passive sleeve 209. Only when the traction block 104 is displaced and pulls the guide wire 105 to gradually straighten, the guide wire 105 begins to apply effective traction force to the passive sleeve 209 as the traction block 104 continues to move, thereby driving the passive sleeve 209 to produce axial displacement. The guide ring 106 and the wire clamp 102 are preferably made of metal materials, which not only have good structural strength, but also have certain thermal conductivity, which is conducive to the conduction and even distribution of heat at the connection part. Preferably, if the guide wire 105 is found to be damaged or its performance degraded and needs to be replaced, a new guide wire 105 should be used for reinstallation. It should be noted that the used guide wire 105 should not be recycled and bent for reuse due to repeated stress and heat cycles. Furthermore, most of the length of the guide wire 105 is located inside the heat pipe 203, with only a small section exposed outside the heat pipe 203. The exposed part is within the coverage area of ​​the protective shell 2, and is thus shielded and protected by the protective shell 2.

[0022] The working principle of this invention is: When installing and deploying cable 1 in the field, firstly, the line clip 102 is wrapped around the outer surface of the preset node sleeve 21 and fixed by the locking structure so that the protective shell 2 is accurately positioned at each node. Then, the support leg 201 is unfolded and rotated relative to the protective shell 2 to a basically vertical state to form a stable support structure. Next, the guide rod 202 is pulled out from the inside of the support leg 201 and inserted into the minimum contact depth range to achieve support and positioning of cable 1. During the process of pulling out the guide rod 202, the conduction tube 207 gradually moves away from the heat conduction tube 203. At this time, the movable shell 206 moves outward along the inside of the heat conduction tube 203 under the elastic force of the return spring 205, driving the locking latch 210 to align and lock into the rectangular hole on the side wall of the heat conduction tube 203, thereby completing the limiting and locking of the guide rod 202, so that the support structure is in a stable working state, and the installation and arrangement of a single node is completed. When cable 1 is used in extremely cold regions, since the temperature of the underground soil layer is usually higher than the surface ambient temperature, the temperature of the bottom end of the guide rod 202 inserted into the soil and its internal conduction cavity 208 approaches the temperature of the underground constant temperature layer. The volatile liquid filled inside vaporizes and rises along the conduction tube 207, condenses and releases heat in the lower temperature area, thereby continuously heating the internal structure of the support leg 201 and the heat conduction tube 203, keeping its overall temperature higher than the external environment level, effectively preventing the support structure from freezing or getting stuck. When a large number of ice cones adhere to the outer surface of cable 1 and its total mass reaches a preset threshold, the cold shrink strip 24 inside cable 1 shrinks under the action of low temperature, and drives the traction plate 23 to move. The traction plate 23 further drives the traction block 104 to move. The traction block 104 pulls the passive sleeve 209 to move axially through the guide wire 105, and drives the locking latch 210 to move through the passive shaft 214, thereby changing the constraint state on the guide rod 202. At this time, under the action of the gravity of the ice cones, cable 1 drives the protective shell 2 and the support leg 201 to move downward slightly as a whole. The support spring 204 is compressed and produces an elastic buffering effect, so that cable 1 can slowly sag as the load increases, thereby avoiding cracking or damage to the cable 1 sheath due to local stress concentration. When the ambient temperature rises or the ice cones on the surface of cable 1 gradually melt and fall off, the external load decreases. Under the elastic recovery action of the support spring 204, the support leg 201 drives cable 1 to gradually rise back to the initial height, thereby realizing adaptive height adjustment and ensuring that cable 1 is in a safe stress state for a long time. In another operating condition, if the ambient temperature is low but the air is dry, and no ice cones form on the surface of cable 1, although the low temperature may still trigger the action of the cold shrink strip 24 and related transmission structure, causing the locking latch 210 to enter the working state, due to the lack of additional load, the support leg 201 can still keep cable 1 off the ground under the support of the support spring 204, preventing cable 1 from drooping and contacting the ground, thereby ensuring its normal operation.

[0023] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An overhead cable with high wear resistance and high flame retardancy, comprising cable (1), characterized in that: The outer surface of the cable (1) is fitted with multiple sets of protective shells (2) at axial intervals. Each set of protective shells (2) consists of two symmetrically arranged half-shells. The two half-shells are interlocked to cover the outside of the cable (1). Two support legs (201) are arranged along the axial direction on the side of the protective shells (2) that are close to each other. The support legs (201) are arranged along the axial direction of the protective shells (2). Universal shafts (103) are fixedly installed at the corresponding ends of the protective shells (2). The two support legs (201) are movably connected to the universal shafts (103). By adjusting the swing angle of the support legs (201), they can be extended to meet the protective shells. The protective shells (2) form an angle, and each of the two protective shells (2) is provided with a wire clip (102) at one end corresponding to each other. The upper ends of the two wire clips (102) are rotatably connected so that they can open and close around the cable (1). The inner side of the wire clip (102) is in contact with the outer surface of the cable (1) for clamping and positioning the cable (1). The outer surface of each wire clip (102) is fixedly installed with a support shaft (101). The end of the support shaft (101) away from the wire clip (102) passes through the protective shell (2) and extends to its outer side. The protective shell (2) is sleeved on the outside of the support shaft (101) and its position is adjusted along its axial direction.

2. The overhead cable with high wear resistance and high flame retardancy according to claim 1, characterized in that: Multiple inner support cylinders (22) are fixedly sleeved on the outer surface of the cable (1). The multiple inner support cylinders (22) are evenly spaced along the axial direction of the cable (1). The spacing between adjacent inner support cylinders (22) is equal. Node sleeves (21) are fixedly sleeved on the outer surface of the inner support cylinders (22). A conductor core (25) for conducting electricity is provided inside the cable (1). Multiple cold shrink strips (24) are arranged around the outside of the conductor core (25). The multiple cold shrink strips (24) are evenly arranged in a ring and cover the outer periphery of the conductor core (25).

3. An overhead cable with high wear resistance and high flame retardancy according to claim 2, characterized in that: The outer surface of the inner support cylinder (22) is provided with multiple traction plates (23). The traction plates (23) are fixedly connected to the cold shrink strip (24). The traction plates (23) are set in two groups, and the two groups of traction plates (23) are arranged radially opposite each other, with their ends away from the cold shrink strip (24) corresponding to each other.

4. An overhead cable with high wear resistance and high flame retardancy according to claim 3, characterized in that: The surface of the line clip (102) and the node sleeve (21) are provided with multiple rectangular holes. The two sets of rectangular holes correspond to each other. A traction block (104) is slidably installed in the rectangular hole on the surface of the line clip (102). The traction block (104) slides back and forth along the extension direction of the rectangular hole. After the traction block (104) passes through the rectangular hole on the node sleeve (21), it comes into contact with the traction plate (23).

5. An overhead cable with high wear resistance and high flame retardancy according to claim 1, characterized in that: A guide rod (202) is inserted inside the support leg (201). The guide rod (202) and the support leg (201) are elastically connected by a support spring (204). A heat-conducting pipe (203) is fixedly installed at the inner end of the support leg (201). The support spring (204) is sleeved on the outside of the heat-conducting pipe (203), and the end of the heat-conducting pipe (203) extends and passes through the inside of the guide rod (202) to form a stable heat-conducting and support structure.

6. An overhead cable with high wear resistance and high flame retardancy according to claim 5, characterized in that: The inner end of the guide rod (202) is fixedly installed with a conductive tube (207). The end of the guide rod (202) away from the support leg (201) is set with a tapered structure so that the guide rod (202) can be inserted into the underground soil layer. The interior of the heat conduction tube (203) is provided with a movable shell (206) that slides axially. The movable shell (206) can move axially back and forth inside the heat conduction tube (203).

7. An overhead cable with high wear resistance and high flame retardancy according to claim 6, characterized in that: The circumferential surface of the movable shell (206) is provided with a ring array of multiple locking latches (210). The side wall of the heat pipe (203) is provided with multiple rectangular holes at corresponding positions. The rectangular holes are located on the right side of the heat pipe (203), and each rectangular hole corresponds to a locking latch (210). The locking latch (210) passes through the rectangular hole and extends out of the outside of the heat pipe (203) to limit the guide rod (202). The movable shell (206) and the heat pipe (203) are connected by a return spring (205). A passive shaft (214) is rotatably installed at the inner end of the movable shell (206).

8. An overhead cable with high wear resistance and high flame retardancy according to claim 7, characterized in that: Multiple guide posts (213) are fixedly arranged on the outer periphery of the passive shaft (214). Each guide post (213) is connected to the corresponding locking latch (210) through a traction rope (211). When the passive shaft (214) rotates, the traction rope (211) synchronously pulls each locking latch (210) to retract towards the passive shaft (214), thereby causing the locking latch (210) to disengage from the rectangular hole or retract into the heat-conducting pipe (203), thus releasing the limit on the guide rod (202).

9. An overhead cable with high wear resistance and high flame retardancy according to claim 8, characterized in that: The active shell (206) is provided with a passive sleeve (209) at one end away from the guide rod (202). The passive sleeve (209) is fitted on the surface of the passive shaft (214). The end of the passive sleeve (209) is provided with a guide groove (215). The guide post (213) is located inside the guide groove (215) and slides with it.

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