An isolated mineral insulated fire-resistant cable

Abstract

The present invention discloses an isolated mineral insulated fire-resistant cable, which relates to the technical field of power cables and includes a cable body, wherein an anti-wear component is provided on the outer surface of the cable body. When the present invention is used, the first anti-wear plate and the second anti-wear plate are pushed to slide to the edge inside the hole, and the arc-shaped strip is pulled to move the blade to cut the capsule membrane on the outer surface of the epoxy resin capsule. The epoxy resin glue flows to the top of the adhesive block through the glue outlet hole, and the arc-shaped partition is completely pulled out. The spring pushes the adhesive block out of the ejection hole and contacts the inner wall of the hole. Wait for the epoxy resin glue to solidify, and achieve a firm bond between the adhesive block and the inner wall of the hole. Under the action of the anti-wear component, a protective cover is formed between the cable body and the edge of the inner wall of the hole, isolating the cable body from direct contact with the edge of the inner wall of the hole, and under the action of the two rubber gaskets, the flexible protection area of ​​the cable body is extended.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, in particular to an isolated mineral insulated fire-resistant cable. Background Art

[0002] Power cables are primarily used to transmit and distribute electrical energy, transporting it from power sources like power plants and substations to various locations where electricity is consumed, such as factories, shopping malls, and residential buildings, to meet the electricity needs of different users. Within power systems, power cables effectively conduct current, reducing energy losses during transmission and ensuring a stable supply of energy. Furthermore, their insulating properties prevent current leakage and electric shock accidents, ensuring safe and reliable power transmission.

[0003] In the existing technology, it is necessary to lay the cable in the cable trench, and pass the cable through the hole on the side wall inside the cable trench and extend it to a lower place for laying. However, the cable trench is generally made of cement concrete, and the edges of the holes opened therein are relatively rough and sharp. The cable is in contact with the edge of the hole for a long time, and the rough and sharp edges of the hole will continuously rub the outer surface of the cable, causing damage and scratches on the outer surface of the cable. This will cause the internal structure of the cable to lose its outer layer protection, making it susceptible to erosion by external environmental factors, thereby reducing the service life of the cable.

[0004] Therefore, we propose an isolated mineral insulated fire-resistant cable to solve the problems raised in the above background technology. Summary of the Invention

[0005] The purpose of the present invention is to provide an isolated mineral insulated fire-resistant cable to solve the problem proposed in the above-mentioned background technology that during the laying process of the cable, the edges of the holes on the side walls of the cable trench are relatively rough and sharp. When the cable passes through the hole, the rough and sharp parts of the hole edge will continue to rub the outer surface of the cable, causing damage and scratches on the outer surface of the cable, resulting in the internal structure of the cable losing its outer layer protection, being easily eroded by external environmental factors, and reducing the service life of the cable.

[0006] To achieve the above object, the present invention provides the following technical solution: an isolated mineral insulated fire-resistant cable, comprising a cable body, wherein an anti-wear component is provided on the outer surface of the cable body;

[0007] The cable body comprises a core conductor, a flame retardant layer and a mineral insulation layer, wherein three core conductors and three mineral insulation layers are provided;

[0008] The anti-wear component includes a first anti-wear plate, a second anti-wear plate, an adhesive block, an epoxy resin capsule and a blade. The inner walls of the first anti-wear plate and the second anti-wear plate are fixedly connected with rubber gaskets. The first anti-wear plate and the second anti-wear plate are used to be clamped on the outer surface of the cable body to form a partition between the cable body and the hole, and do not directly contact the edge of the hole. The rubber gasket is responsible for soft contact between the cable body and the first anti-wear plate and the second anti-wear plate. The blade is responsible for cutting open the epoxy resin capsule so that the internal epoxy resin glue drips onto the surface of the adhesive block, fixing the adhesive block on the inner wall of the hole. The adhesive block is responsible for fixing the first anti-wear plate inside the hole.

[0009] Preferably, the adhesive blocks, epoxy resin capsules and blades are provided in plurality, the bottoms of the plurality of adhesive blocks are fixedly mounted with push rods, the outer surfaces of the plurality of push rods are movably sleeved with springs, the bottoms of the outer surfaces of the plurality of push rods are movably sleeved with connecting plates, and the outer surface of the first anti-wear plate is provided with a plurality of ejection holes.

[0010] Preferably, the anti-wear component also includes an arc-shaped partition, a plurality of glue grooves are opened inside the arc-shaped partition, a plurality of glue outlet holes are opened at the bottom of the arc-shaped partition, a pull rod is fixedly installed at the bottom of the front surface of the plurality of blades, one end of the plurality of pull rods is fixedly connected to an arc-shaped bar, a square metal block is fixedly installed on the rear surface of the plurality of blades, and a square magnet is fixedly installed on the rear surface wall inside the plurality of glue grooves.

[0011] Preferably, a plurality of the front surface walls inside the glue grooves are fixedly installed with a glue scraping ring, an arc-shaped fixing plate is fixedly installed at the top of the rear surface of the arc-shaped partition, the bottom of the arc-shaped fixing plate is fixedly connected to two arc-shaped magnets, the top of the first anti-wear plate is fixedly connected to two arc-shaped metal bars, the tops of the two arc-shaped metal bars are magnetically connected to the bottoms of the two arc-shaped magnets respectively, and the plurality of square magnets are magnetically connected to the plurality of square metal blocks respectively.

[0012] Preferably, the outer surfaces of the plurality of epoxy resin capsules are respectively fixedly mounted on the top surfaces inside the plurality of glue grooves, one ends of the plurality of pull rods are respectively movable through the plurality of scraper rings to the front surface of the arc-shaped partition, the rear surface of the arc strip is in contact with the bottom of the front surface of the arc-shaped partition, blocks are fixedly mounted on both sides of the bottom of the first anti-wear plate, and slots are provided on both sides of the outer surface of the second anti-wear plate, the outer surfaces of the two blocks are respectively movably embedded in the inside of the two slots, a U-shaped rod is fixedly mounted on the front surface of the arc partition, and a connecting rod is fixedly mounted on the front surface of the arc strip.

[0013] Preferably, a limit rod is movably embedded in the interior of each of the plurality of top rods, an arc-shaped groove is also provided in the interior of the first anti-wear plate, a pulling hole is provided at the edge of the outer surface of one side of the first anti-wear plate, the first anti-wear plate and the second anti-wear plate are connected by bolts, and the inner walls of the two rubber gaskets are in contact with the outer surface of the cable body.

[0014] Preferably, one end of the multiple springs is fixedly connected to the outer surface of one side of the multiple adhesive blocks respectively, the other ends of the multiple springs are fixedly installed on the top of the connecting plate, the outer surface of the connecting plate is fixedly installed inside the arc groove, the bottom ends of the multiple limit rods are fixedly installed on the bottom surface inside the arc groove, and the outer surface of the arc partition is movably embedded in the inside of the arc groove and the pull-out hole.

[0015] Preferably, the cable body further comprises an outer sheath, an armor layer is arranged inside the outer sheath, an inner sheath is arranged inside the armor layer, a first isolation layer is arranged inside the inner sheath, and the interior of the first isolation layer contacts the outer surface of the flame retardant layer.

[0016] Preferably, a plurality of fillers are arranged inside the flame retardant layer, three copper strips are arranged inside the plurality of fillers, an outer semiconductor shielding layer is arranged inside each of the three copper strips, and the interiors of the three outer semiconductor shielding layers are in contact with the outer surfaces of the three mineral insulation layers respectively.

[0017] Preferably, a second isolation layer is provided inside each of the three mineral insulation layers, an inner semiconductor shielding layer is provided on the outer surfaces of each of the three core conductors, and the interiors of the three second isolation layers are in contact with the outer surfaces of the three inner semiconductor shielding layers respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) When the present invention is used, the first anti-wear plate and the second anti-wear plate are alternately clamped on the outer surface of the cable body and fixed by bolts. The two rubber gaskets cover the outer surface of the cable body up and down, pushing the first anti-wear plate and the second anti-wear plate to slide to the edge inside the hole. Pull the arc strip to move the blade, cut the capsule membrane on the outer surface of the epoxy resin capsule, and the epoxy resin glue flows to the top of the adhesive block through the glue outlet hole. The arc partition is completely pulled out, and the spring pushes the adhesive block through the ejection hole and contacts the inner wall of the hole. Wait for the epoxy resin glue to solidify, and achieve a firm bond between the adhesive block and the inner wall of the hole. Under the action of the anti-wear component, a protective cover is formed between the cable body and the edge of the inner wall of the hole, isolating the cable body from direct contact with the edge of the inner wall of the hole. Under the action of the two rubber gaskets, the flexible protection area of ​​the cable body is extended, thereby achieving the cable protection effect and increasing the service life of the cable.

[0020] (2) Furthermore, the outer sheath is made of polyvinyl chloride to protect the cable from environmental influences. The armor layer is made of galvanized steel tape to enhance the cable's mechanical strength. The inner sheath provides isolation, sealing, and moisture resistance. The first isolation layer is made of polyester film, separating the inner sheath from the flame-retardant layer to prevent interaction between the different materials. The flame-retardant layer is made of halogen-free flame-retardant material to enhance the cable's fire safety. The filler is glass fiber rope, which fills gaps within the cable and provides a compact cable structure.

[0021] (3) Furthermore, copper tape is used to shield the electromagnetic field generated by the core conductor. Both the outer and inner semiconducting shielding layers utilize a semiconducting material, made from a mixture of conductive materials such as carbon black and polymers, to enhance the cable's insulation performance and operational reliability. The mineral insulation layer utilizes a mineral insulating material with excellent electrical insulation, high-temperature resistance, and chemical corrosion resistance, isolating the core conductor from the surrounding environment and preventing current leakage. A second isolation layer utilizes polypropylene film to separate the mineral insulation layer from the inner semiconducting shielding layer, preventing mutual interference between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front perspective view of an isolated mineral insulated fire-resistant cable of the present invention;

[0023] Figure 2 This is a schematic structural diagram of a cable body in an isolated mineral insulated fire-resistant cable of the present invention;

[0024] Figure 3 This is a schematic structural diagram of a copper strip in an isolated mineral insulated fire-resistant cable of the present invention;

[0025] Figure 4 This is a perspective view of the structure of an anti-wear component in an isolated mineral insulated fire-resistant cable of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the structure of a first anti-wear plate in an isolated mineral insulated fire-resistant cable of the present invention;

[0027] Figure 6 This is a schematic cross-sectional view of the structure of an arc-shaped fixing plate in an isolated mineral insulated fire-resistant cable of the present invention;

[0028] Figure 7 This is a schematic cross-sectional view of the structure of an arc-shaped partition in an isolated mineral insulated fire-resistant cable of the present invention;

[0029] Figure 8 This is a perspective view of the structure of the arc strip in an isolated mineral insulated fire-resistant cable of the present invention;

[0030] Figure 9This is a schematic cross-sectional view of the structure of a connecting plate in an isolated mineral insulated fire-resistant cable of the present invention;

[0031] Figure 10 This is a schematic cross-sectional view of the structure of a top rod in an isolated mineral insulated fire-resistant cable of the present invention;

[0032] Figure 11 This is a perspective view of the structure of a blade in an isolated mineral insulated fire-resistant cable of the present invention;

[0033] Figure 12 For the present invention Figure 10 Enlarged stereogram of point A.

[0034] In the picture:

[0035] 1. Cable body; 101. Outer sheath; 102. Armor layer; 103. Inner sheath; 104. First isolation layer; 105. Flame retardant layer; 106. Filler; 107. Copper tape; 108. Outer semiconducting shield; 109. Mineral insulation layer; 110. Second isolation layer; 111. Inner semiconducting shield; 112. Core conductor; 2. Wear-resistant assembly; 201. First wear-resistant plate; 202. Second wear-resistant plate; 203. Rubber gasket; 204. Arc partition; 205. Arc fixing plate; 206. Arc Magnet; 207, curved metal strip; 208, ejection hole; 209, curved slot; 210, pull-out hole; 211, glue slot; 212, epoxy resin capsule; 213, glue outlet hole; 214, pull rod; 215, blade; 216, square magnet; 217, square metal block; 218, glue scraper ring; 219, curved strip; 220, connecting plate; 221, ejector rod; 222, limit rod; 223, spring; 224, glue block; 225, knife holder; 3, connecting rod; 4, U-shaped rod; 5, clamping block; 6, clamping slot. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figures 1-12 As shown, the present invention provides a technical solution: an isolated mineral insulated fire-resistant cable, comprising a cable body 1, and an anti-wear component 2 is provided on the outer surface of the cable body 1. Figure 2 and Figure 3The cable body 1 includes a core conductor 112, a flame retardant layer 105 and a mineral insulation layer 109, and three core conductors 112 and three mineral insulation layers 109 are provided; the anti-wear component 2 includes a first anti-wear plate 201, a second anti-wear plate 202, an adhesive block 224, an epoxy resin capsule 212 and a blade 215. The inner walls of the first anti-wear plate 201 and the second anti-wear plate 202 are fixedly connected with a rubber gasket 203. The first anti-wear plate 201 and the second anti-wear plate 202 are used to be clamped on the outer surface of the cable body 1. The anti-wear component 2 forms a partition between the cable body 1 and the hole, so that the cable body 1 cannot directly contact the edge of the hole. The rubber gasket 203 is responsible for soft contact between the cable body 1 and the first anti-wear plate 201 and the second anti-wear plate 202. The blade 215 is responsible for cutting the epoxy resin capsule 212, so that the internal epoxy resin glue drips onto the surface of the adhesive block 224, fixing the adhesive block 224 on the inner wall of the hole.The adhesive block 224 is responsible for fixing the first anti-wear plate 201 inside the hole. The adhesive block 224, the epoxy resin capsule 212 and the blade 215 are all provided in plurality. The bottom of the plurality of adhesive blocks 224 is fixedly installed with a push rod 221. The outer surfaces of the plurality of push rods 221 are movably sleeved with a spring 223. The bottom of the outer surface of the plurality of push rods 221 is movably sleeved with a connecting plate 220. The outer surface of the first anti-wear plate 201 is provided with a plurality of ejection holes 208. The anti-wear component 2 also includes an arc-shaped partition 204. The interior of the arc-shaped partition 204 is provided with a plurality of adhesive grooves 211. The bottom of the arc-shaped partition 204 is provided with a plurality of Glue outlet 213, a pull rod 214 is fixedly installed at the bottom of each blade 215, and the end of the pull rod 214 away from the blade 215 is fixedly connected to the arc strip 219. The side of the blade 215 not connected to the pull rod 214, that is, the rear surface of the blade is fixed with a square metal block 217, and the rear surface walls inside the multiple glue grooves 211 are fixedly installed with square magnets 216. The front surface walls inside the multiple glue grooves 211 are fixed with glue scraping rings 218. The top of the arc partition 204 is covered by the arc fixing plate 205, and the bottom of the arc fixing plate 205 is fixedly connected to two arc magnets 206. The first anti-wear plate 201 Two arc-shaped metal strips 207 are fixedly connected to the top, and the tops of the two arc-shaped metal strips 207 are magnetically connected to the bottoms of the two arc-shaped magnets 206 respectively. A plurality of square magnets 216 are magnetically connected to a plurality of square metal blocks 217 respectively. The epoxy resin capsules 212 are fixed to the top surface inside the glue groove 211 respectively. One end of the plurality of pull rods 214 is movable through the plurality of scraping rubber rings 218 to the front surface of the arc-shaped partition 204. Blocks 5 are fixedly installed on both sides of the bottom of the first anti-wear plate 201. Slots 6 are provided on both sides of the outer surface of the second anti-wear plate 202. The outer surfaces of the two said blocks 5 are movable. Embedded in the two slots 6, the front surface of the arc partition 204 is fixedly installed with a U-shaped rod 4, the front surface of the arc strip 219 is fixedly installed with a connecting rod 3, the arc strip 219 has a portion in contact with the bottom of the arc partition 204, and the internal parts of the multiple top rods 221 cooperate with the limiting rod 222. The interior of the first anti-wear plate 201 also has an arc groove 209, and a pulling hole 210 is provided at the edge of the outer surface of one side of the first anti-wear plate 201. The first anti-wear plate 201 and the second anti-wear plate 202 are connected by bolts, and the inner sides of the two rubber gaskets 203 are in contact with the outer surface of the cable body 1.

[0038] like Figure 9 As shown, one end of the spring 223 is fixedly connected to the outer side of the adhesive block 224, and the other end of the spring 223 is fixed to the upper surface of the connecting plate 220. The connecting plate 220 is arranged inside the arc groove 209. The bottom end of the limiting rod 222 is fixedly installed on the bottom surface inside the arc groove 209. The outer surface of the arc partition 204 is movably embedded in the arc groove 209 and the pull-out hole 210.

[0039] In this embodiment, when in use, the first anti-wear plate 201 is provided with blocks 5 on both sides of the bottom, and the second anti-wear plate 202 is provided with slots 6 on both sides of the top. Figure 4 After the cable body 1 is inserted into the hole inside the cable trench, the first wear plate 201 and the second wear plate 202 are clamped to the outer surface of the cable body 1 from top to bottom. Then, the first wear plate 201 is moved so that the two clamping blocks 5 at the bottom of the left and right ends of the first wear plate 201 are respectively embedded in the clamping grooves 6 of the second wear plate 202.

[0040] Further, such as Figure 1 、 Figure 4 As shown, the first wear plate 201 and the second wear plate 202 are fixed to the outer surface of the cable body 1, and the two rubber gaskets 203 respectively cover the outer surface of the cable body 1. Due to the gap between the rubber gaskets 203 and the outer surface of the cable body 1, the first wear plate 201 and the second wear plate 202 can be pushed to slide on the outer surface of the cable body 1 to the edge of the hole inside.

[0041] When the first anti-wear plate 201 and the second anti-wear plate 202 move to the designated position, the clamping block 5

[0042] Insert the card slot 6 into the card slot, and then lock the card block 5 in the card slot 6 by means of bolts. At this time, the two rubber gaskets 203 form a circle. Figure 1 As shown, the cable body 1 is located between the two rubber gaskets 203 , and the outer side of the cable body 1 fits between the two rubber gaskets 203 .

[0043] For further information, please refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 10 A connecting rod 3 is provided on the outer surface of the arc strip 219. By pulling the connecting rod 3, the arc strip 219 is driven to move in a first direction. The first direction refers to driving the arc strip 219 to move in the direction of the extending part of the rubber gasket 203. Since the arc strip 219 is connected to the pull rod 214, the pull rod 214 also moves with the arc strip 219, further driving the blade 215 to move, so that the blade 215 is always in contact with the epoxy resin capsule 212 during the movement process.

[0044] For further information, please refer to Figure 11 and Figure 12 The bottom of the blade 215 has a blade seat 225, and a square metal block 217 is fixed to the blade seat 225. When the pull rod 214 does not move, the square metal block 217 is always magnetically connected to the square magnet 216. When the pull rod 214 is driven by the curved bar 219, the square metal block 217 is separated from the square magnet and is no longer magnetically attracted.

[0045] Furthermore, as the blade 215 moves along the axis of the pull rod 214, the outer surface of the epoxy resin capsule 212 is cut open, causing the epoxy resin glue inside the capsule to flow downward. At this time, the blade 215 moves from the square magnet 216 to the position of the scraper ring 218. The position distribution of the epoxy resin capsule 212, the glue outlet 213 and the glue block 224 is shown in the figure. Figure 5 As shown, the glue hole 213 in the middle is located at the top of the glue block 224 in the middle, and the glue holes 213 distributed in an arc shape on both sides are staggered with the corresponding glue blocks 224. The glue blocks 224 are located below the glue holes 213 distributed in an arc shape, so that the central epoxy resin glue flows to the central area of ​​the top of the glue block 224 through the central glue hole 213, and the epoxy resin glue on both sides flows to the non-central area of ​​the top of the lower glue block 224 through the corresponding glue holes 213, so that epoxy resin glue can be attached to the top of multiple glue blocks 224. At this time, the epoxy resin glue attached to the top of the glue block 224 is in a solidified state.

[0046] For further information, please refer to Figure 7 and Figure 8A U-shaped rod 4 is mounted on the outer surface of curved partition 204. This rod then pulls curved partition 204 toward the extension of rubber gasket 203 (aligned with the movement of curved strip 219), driving curved fixing plate 205 to move, separating curved magnet 206 from curved metal strip 207. This simultaneously drives pull rod 214 and curved strip 219 outward. The top of adhesive block 224 contacts the bottom of curved partition 204 (at adhesive outlet 213), limiting the position of curved partition 204 and causing spring 223 to contract and compress. When the arc-shaped partition 204 is pulled out from the arc-shaped groove 209 and the withdrawal hole 210, the adhesive block 224 loses its limit, the spring 223 loses its extrusion and recovers its deformation. Under the elastic deformation of the spring 223, the adhesive block 224 is pushed upward, driving the ejector rod 221 to move upward on the outer surface of the limit rod 222. As the adhesive block 224 passes upward through the corresponding ejection hole 208, the adhesive block 224 with epoxy resin contacts the inner wall of the hole after extending out of the ejection hole 208. At this time, the uncured epoxy resin glue attached to the top of the adhesive block 224 will adhere between the inner wall of the hole and the adhesive block 224. After the adhesive block 224 contacts the inner wall of the hole, wait for the epoxy resin glue to solidify. Epoxy resin glue is composed of epoxy resin and curing agent. The epoxy resin molecules contain active groups such as epoxy groups and hydroxyl groups, which can react chemically with hydroxyl groups and metal ions on the surface of cement concrete to form chemical bonds. At the same time, the epoxy resin will undergo a cross-linking reaction during the curing process to form a three-dimensional network structure. This structure not only makes itself have high strength and stability, but also can well wrap and penetrate into the pores on the surface of the cement concrete, increasing the bonding area and mechanical bite effect, thereby achieving a firm bond between the adhesive block 224 and the inner wall of the hole, and further fixing the first anti-wear plate 201 and the second anti-wear plate 202 in the inner wall of the hole, preventing the first anti-wear plate 201 and the second anti-wear plate 202 from sliding on the surface of the cable body 1 and moving away from the inner edge of the hole, affecting the protection effect of the cable body 1. Under the action of the anti-wear component 2, a protective cover is formed between the cable body 1 and the edge of the inner wall of the hole, isolating the cable body 1 from direct contact with the edge of the inner wall of the hole, and under the action of the two rubber gaskets 203, the flexible protection area of ​​the cable body 1 is extended to prevent the rough and sharp parts of the hole edge from continuously rubbing against the outer surface of the cable, causing damage and scratches on the outer surface of the cable, thereby achieving the cable protection effect and improving the service life of the cable. It solves the problem that during the laying process of the cable, the edge of the hole on the side wall of the cable trench is relatively rough and sharp. When the cable passes through the hole, the rough and sharp parts of the hole edge will continuously rub against the outer surface of the cable, causing damage and scratches on the outer surface of the cable, resulting in the internal structure of the cable losing the outer layer protection and being easily eroded by external environmental factors, thereby reducing the service life of the cable.

[0047] Example 2: Figure 1-Figure 3As shown, the outer surface of the cable body 1 is provided with an anti-wear component 2; the cable body 1 includes a core conductor 112, a flame retardant layer 105 and a mineral insulation layer 109, and the core conductor 112 and the mineral insulation layer 109 are provided in three pieces. The cable body 1 also includes an outer sheath 101, an armor layer 102 is provided inside the outer sheath 101, an inner sheath 103 is provided inside the armor layer 102, a first isolation layer 104 is provided inside the inner sheath 103, the interior of the first isolation layer 104 is in contact with the outer surface of the flame retardant layer 105, and the interior of the flame retardant layer 105 is provided. Multiple fillers 106 are provided, three copper strips 107 are provided inside the multiple fillers 106, outer semiconductor shielding layers 108 are provided inside the three copper strips 107, the interiors of the three outer semiconductor shielding layers 108 are in contact with the outer surfaces of three mineral insulation layers 109 respectively, second isolation layers 110 are provided inside the three mineral insulation layers 109, inner semiconductor shielding layers 111 are provided on the outer surfaces of the three core conductors 112, and the interiors of the three second isolation layers 110 are in contact with the outer surfaces of the three inner semiconductor shielding layers 111 respectively.

[0048] In this embodiment, when in use, the outer sheath 101 in the cable body 1 is made of polyvinyl chloride material to protect the cable from the influence of the external environment, such as erosion by moisture, ultraviolet rays, chemicals, etc., and at the same time has a certain mechanical strength to prevent the cable from being damaged by external forces, extend the service life of the cable, and improve the reliability and stability of the cable in various environments. The armor layer 102 is made of galvanized steel strip, which can enhance the mechanical strength of the cable, enable the cable to withstand greater tension and pressure, and reduce the risk of mechanical damage to the cable during installation and use. The inner sheath 103 is made of the same polyvinyl chloride material as the outer sheath 101, isolating the armor layer 102 from the internal wire core and other structures, preventing the armor layer 102 from damaging the internal structure, and at the same time playing a certain sealing and moisture-proof role, improving the insulation and moisture-proof properties of the cable, and ensuring the stable performance of the cable during long-term use. The first isolation layer 104, made of polyester film, further isolates the inner sheath 103 from the flame-retardant layer 105, preventing interaction between the different materials while also providing insulation and buffering. The flame-retardant layer 105 is made of halogen-free flame-retardant material, improving the cable's fire safety, preventing flame spread and slowing combustion. The filler 106, made of fiberglass rope, fills gaps within the cable, compacting the cable structure and preventing the core from swaying within the cable. It also provides buffering and thermal insulation. The copper tape 107 serves as a shielding layer, shielding the electromagnetic field generated by the cable's internal core conductors 112, preventing electromagnetic interference from leaking into the surrounding environment and resisting interference from external electromagnetic fields on the cable's internal signals. The outer semiconductor shielding layer 108, made of a semiconductive material blended with a polymer and conductive materials such as carbon black, evens out the electric field distribution on the outer surface of the cable's mineral insulation layer 109, eliminating air gaps and partial discharge between the mineral insulation layer 109 and other components, thereby improving the cable's insulation performance and operational reliability. Mineral insulation layer 109, made of a mineral insulating material with excellent electrical insulation, high-temperature resistance, and chemical corrosion resistance, isolates core conductor 112 from the surrounding environment, preventing current leakage. It withstands the operating voltage of the cable during operation and ensures safe transmission of electrical energy. Secondary isolation layer 110, made of polypropylene film, separates mineral insulation layer 109 from inner semiconducting shielding layer 111, preventing mutual interference between them. Inner semiconducting shielding layer 111, made of the same semiconducting material as outer semiconducting shielding layer 108, evens out the electric field distribution on the surface of core conductor 112, eliminating air gaps and partial discharge between core conductor 112 and mineral insulation layer 109, thereby improving the cable's insulation performance and operational reliability.

[0049] The effect and working principle of the entire mechanism are as follows: after the cable body 1 is inserted into the hole inside the cable trench, the first wear plate 201 and the second wear plate 202 are alternately clamped onto the outer surface of the cable body 1. The first wear plate 201 is then moved so that the two clamping blocks at the bottom are respectively embedded in the two clamping grooves. The clamping blocks are then fixed in the clamping grooves with bolts. At this point, the first wear plate 201 and the second wear plate 202 are fixed to the outer surface of the cable body 1, and the two rubber gaskets 203 cover the outer surface of the cable body 1 from top to bottom. The first wear plate 201 and the second wear plate 202 are then pushed to slide along the outer surface of the cable body 1 to the edge of the hole inside. Pulling the curved strip 219 toward the extension of the rubber gasket 203 moves the pull rod 214 and blade 215, while simultaneously pulling the square metal block 217 in the direction of the movement of the curved strip 219, thereby separating it from the square magnet 216. As the blade 215 continues to move, the outer surface of the epoxy resin capsule 212 is cut open, causing the epoxy resin glue inside the capsule to flow downward. The central epoxy resin glue flows through the central glue outlet 213 to the top of the central adhesive block 224, and the epoxy resin glue on both sides flows through the corresponding glue outlet 213 to the top of the slightly offset adhesive blocks 224 below. The curved partition 204 is pulled toward the extension of the rubber gasket 203 by the U-shaped rod 4, driving the curved fixing plate 205 to move together, causing the curved magnet 206 to separate from the curved metal strip 207, while simultaneously driving the pull rod 214 and curved strip 219 to move together. When the arc partition 204 is pulled out from the arc groove 209 and the pulling hole 210, the adhesive block 224 loses its limit and the spring 223 loses its extrusion. Under the elastic force of the spring 223, the adhesive block 224 is pushed to move upward, driving the ejector rod 221 to move upward on the outer surface of the limit rod 222, and passing through the corresponding ejection hole 208 upward together with the adhesive block 224, and then contacting the inner wall of the hole. At this time, the uncured epoxy resin glue attached to the top of the adhesive block 224 will stick between the inner wall of the hole and the adhesive block 224. After the adhesive block 224 contacts the inner wall of the hole, wait for the epoxy resin glue to solidify and solidify, so as to achieve a firm bond between the adhesive block 224 and the inner wall of the hole, and further fix the first wear-resistant plate 201 and the second wear-resistant plate 202 in the inner wall of the hole. The anti-wear assembly 2 forms a protective sheath between the cable body 1 and the edge of the inner wall of the hole, isolating the cable body 1 from direct contact with the inner edge of the hole. The two rubber gaskets 203 extend the flexible protection area of ​​the cable body 1. The outer sheath 101 is made of polyvinyl chloride to protect the cable from the external environment. The armor layer 102 is made of galvanized steel strip, enabling the cable to withstand greater tension and pressure. The inner sheath 103 is made of the same polyvinyl chloride material as the outer sheath 101, improving the cable's insulation and moisture resistance.The first isolation layer 104 is made of polyester film, which further isolates the inner sheath 103 from the flame-retardant layer 105 and prevents mutual influence between the different materials. The flame-retardant layer 105 is made of halogen-free flame-retardant material to improve the fire safety performance of the cable. The filler 106 is made of glass fiber rope and is used to fill the gaps inside the cable to make the cable structure compact. The copper tape 107 serves as a shielding layer to shield the electromagnetic field generated by the core conductor 112 inside the cable. The outer semiconductor shielding layer 108 is made of a semi-conductive material made by mixing conductive materials such as carbon black with polymers. It evens out the electric field distribution on the outer surface of the cable's mineral insulation layer 109 and eliminates air gaps and local discharge between the mineral insulation layer 109 and other components. The mineral insulation layer 109 uses mineral insulating materials to isolate the core conductor 112 from the surrounding environment and prevent current leakage. The second isolation layer 110 is made of polypropylene film to isolate the mineral insulation layer 109 from the inner semiconductor shielding layer 111 to prevent mutual influence between the two. The inner semiconductor shielding layer 111 is made of the same semi-conductive material as the outer semiconductor shielding layer 108 to evenly distribute the electric field on the surface of the core conductor 112 and eliminate the air gap and local discharge between the core conductor 112 and the mineral insulation layer 109.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An isolated mineral insulated fire-resistant cable, comprising a cable body and a spring, characterized in that: An anti-wear component is provided on the outer surface of the cable body; The cable body comprises a plurality of core conductors and a flame retardant layer wrapped around the outside of the core conductors, and a mineral insulation layer wrapped around the outside of the flame retardant layer; The anti-wear component includes a first anti-wear plate, a second anti-wear plate, an adhesive block, an epoxy resin capsule and a blade for matching the outer surface of the cable body. After the first anti-wear plate and the second anti-wear plate are connected, they are used to form a partition between the cable body and the hole; the inner walls of the first anti-wear plate and the second anti-wear plate are fixed with rubber gaskets, and the rubber gaskets are used for soft contact between the cable body and the first anti-wear plate and the second anti-wear plate. The blade is used to cut open the epoxy resin capsule so that the internal epoxy resin glue drips onto the surface of the adhesive block, and the adhesive block is used to fix the first anti-wear plate to the inner wall of the hole.

2. The isolated mineral insulated fire-resistant cable according to claim 1, characterized in that: An arc-shaped groove is provided on the first anti-wear plate, and the adhesive block is arranged in the arc-shaped groove; a connecting plate is also provided inside the arc-shaped groove, one end of the ejector rod is fixed to the adhesive block, and the other end of the ejector rod passes through the connecting plate and is sleeved on the limiting rod, and one end of the limiting rod is connected to the bottom of the arc-shaped groove; a plurality of ejection holes are also provided on the surface of the first anti-wear plate in the arc-shaped groove.

3. The isolated mineral insulated fire-resistant cable according to claim 2, characterized in that: The anti-wear component also includes an arc-shaped partition, which is movably arranged in the arc-shaped groove; a plurality of glue grooves for accommodating epoxy resin capsules are opened on the arc-shaped partition, and a plurality of glue outlet holes are opened at the bottom of the arc-shaped partition near the glue groove; the anti-wear component also includes a pull rod passing through the glue groove, and one end of the pull rod extending into the glue groove is connected to the knife seat, a blade is arranged inside the knife seat, and a square metal block is arranged on the outside of the knife seat; a square magnet is also arranged inside the glue groove to be magnetically attracted to the square metal block.

4. The isolated mineral insulated fire-resistant cable according to claim 3, characterized in that: A scraper ring is also fixed to the inner wall of the glue groove, and an arc-shaped fixing plate is set to separate the surface of the arc-shaped partition. The bottom of the arc-shaped fixing plate is fixedly connected to multiple arc-shaped magnets. The top of the first anti-wear plate is fixed to multiple arc-shaped metal strips, and the top of each arc-shaped metal strip is magnetically connected to the bottom of each arc-shaped magnet, and the multiple square magnets are magnetically connected to multiple square metal blocks.

5. The isolated mineral insulated fire-resistant cable according to claim 4, characterized in that: One end of each of the pull rods is movable through each of the scraper rings to the front surface of the arc-shaped partition. The end of the pull rod that does not extend into the glue groove passes through the scraper ring and is connected to the arc strip, and the arc strip is in contact with the bottom of the front surface of the arc partition; the bottom of the first anti-wear plate is fixed with blocks on both sides, and the outer surface of the second anti-wear plate is provided with slots on both sides, and the two blocks are respectively matched with the slots, the front surface of the arc partition is fixed with a U-shaped rod, and the front surface of the arc strip is fixed with a connecting rod.

6. The isolated mineral insulated fire-resistant cable according to claim 5, characterized in that: A pulling hole is provided at the edge of the outer surface of one side of the first anti-wear plate. The first anti-wear plate and the second anti-wear plate are connected by bolts. The inner walls of the two rubber gaskets are in contact with the outer surface of the cable body.

7. The isolated mineral insulated fire-resistant cable according to claim 6, characterized in that: One end of the spring is fixedly connected to the outer surface of one side of the adhesive block, and the other end of the spring is fixedly installed on the top of the connecting plate. The outer surface of the arc partition is movably embedded in the arc groove and the pulling hole.

8. The isolated mineral insulated fire-resistant cable according to claim 1, characterized in that: The cable body also includes an outer sheath, an armor layer is arranged inside the outer sheath, an inner sheath is arranged inside the armor layer, a first isolation layer is arranged inside the inner sheath, and the interior of the first isolation layer contacts the outer surface of the flame retardant layer.

9. The isolated mineral insulated fire-resistant cable according to claim 8, characterized in that: A plurality of fillers are arranged inside the flame retardant layer, three copper strips are arranged inside the plurality of fillers, an outer semiconductor shielding layer is arranged inside each of the three copper strips, and the interiors of the three outer semiconductor shielding layers are in contact with the outer surfaces of the three mineral insulation layers respectively.

10. The isolated mineral insulated fire-resistant cable according to claim 9, characterized in that: A second isolation layer is provided inside each of the three mineral insulation layers, an inner semiconductor shielding layer is provided on the outer surfaces of each of the three core conductors, and the interiors of the three second isolation layers are in contact with the outer surfaces of the three inner semiconductor shielding layers respectively.

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