A crosslinked polyethylene insulated mining power cable

Abstract

This invention relates to the field of power cable technology, specifically to a cross-linked polyethylene insulated mining power cable, comprising a conductor and a protective assembly. The protective assembly includes an insulation section, a flame-retardant section, a metal shielding layer, an inner sheath, an armored buffer layer, a buffer filling layer, and an outer sheath. The armored buffer layer is essentially a galvanized steel corrugated pipe, longitudinally welded into a tubular shape and fitted over the cable to form the armored buffer layer. It provides compressive and impact resistance exceeding that of steel wire armor, and the corrugated structure has inherent elasticity, enabling it to buffer external forces. The buffer filling layer uses flame-retardant polypropylene mesh tear rope, which tightly fills the gap between the armored buffer layer and the inner sheath, further enhancing the buffering effect. This invention can improve the cable's impact resistance, prevent impact energy from being conducted to the internal insulated core wires of the cable, and prevent safety accidents such as insulation damage and short circuits.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a cross-linked polyethylene insulated mining power cable. Background Technology

[0002] Mining power cables are the lifeline of underground power supply systems in coal mines, metal mines, and other similar facilities. Their reliability is directly related to the safe production and efficient operation of the mine. The underground environment is extremely complex, and cables often face severe mechanical challenges such as being hit by falling rocks, being crushed by equipment, and being frequently dragged. At the same time, there are unfavorable conditions such as dim lighting, high humidity, and susceptibility to corrosion. The tensile strength of the traditional mining cables currently in widespread use is insufficient.

[0003] The existing technology discloses a mining power cable that improves the tensile strength of the cable by using steel wire braiding or steel strip wrapping as the armor layer.

[0004] However, while steel wire armor can provide good tensile strength, it has limited resistance to instantaneous lateral impact pressure, such as falling coal or rock impacts or continuous radial compression. It has insufficient impact resistance, and the impact energy can easily be conducted to the internal insulated core wire, leading to insulation damage, short circuits, or even safety accidents. Summary of the Invention

[0005] The purpose of this invention is to provide a cross-linked polyethylene insulated mining power cable that can improve the cable's impact resistance, prevent impact energy from being conducted to the insulated core wire inside the cable, and prevent safety accidents such as insulation damage and short circuits.

[0006] To achieve the above objectives, the present invention provides a cross-linked polyethylene insulated mining power cable, comprising a conductor and a protective assembly, wherein the protective assembly comprises an insulation part, a flame-retardant part, a metal shielding layer, an inner sheath, an armored buffer layer, a buffer filling layer, and an outer sheath. The insulating part is disposed on the outside of the conductor, the flame-retardant part is disposed on the outside of the insulating part, the metal shielding layer is disposed on the outer layer of the flame-retardant part, the inner sheath is disposed on the outside of the metal shielding layer, the armored buffer layer is disposed on the outside of the inner sheath, the buffer filling layer is disposed between the inner sheath and the armored buffer layer, and the outer sheath is disposed on the outside of the armored buffer layer.

[0007] The insulating portion includes an inner insulating layer and a main insulating layer; the inner insulating layer is disposed on the outside of the conductor, and the main insulating layer is disposed on the outside of the inner insulating layer.

[0008] The flame-retardant part includes a flame-retardant filling layer and a cable wrapping layer; the flame-retardant filling layer is disposed outside the main insulation layer, and the cable wrapping layer is disposed between the flame-retardant filling layer and the metal shielding layer.

[0009] The cross-linked polyethylene insulated mining power cable further includes a positioning component; the positioning component is located outside the outer sheath.

[0010] The positioning component includes a connecting part, a docking part, and a mounting part; the connecting part is located outside the outer sheath, the docking part is disposed on the side of the connecting part, and the mounting part is disposed on the side of the connecting part.

[0011] The connecting part includes an arc-shaped connector, a connecting bolt, and a first anti-slip protrusion; the arc-shaped connector is located on the outside of the outer sheath, and the outside of the arc-shaped connector is provided with a plurality of first threaded holes; the connecting bolt is threadedly connected to the arc-shaped connector and is located on the side of the arc-shaped connector; the first anti-slip protrusion is fixedly connected to the arc-shaped connector and is located inside the arc-shaped connector.

[0012] The docking part includes a rotating shaft and an arc-shaped docking body; the rotating shaft and the arc-shaped docking body are rotatably connected and located on the side of the arc-shaped docking body; the arc-shaped docking body and the rotating shaft are fixedly connected and located on the side of the rotating shaft, and the outer side of the arc-shaped docking body is provided with a plurality of second threaded holes.

[0013] This invention discloses a cross-linked polyethylene insulated mining power cable. The insulation portion is made of insulating material, and the insulation portion and the conductor constitute an insulated core. The flame-retardant portion provides flame retardancy for the cable. The metal shielding layer is braided from tin-plated copper wire, providing flexible electromagnetic shielding and resistance to repeated bending. The inner sheath is made of flame-retardant polyolefin sheathing material, used to fix the internal structure and form the first flame-retardant barrier. The armored buffer layer is essentially a galvanized steel corrugated pipe, longitudinally welded into a tubular shape and fitted over the cable to form an armored buffer layer, providing protection beyond that of steel wire armor. The cable boasts superior resistance to pressure and impact. Its corrugated structure provides inherent elasticity, effectively buffering external forces. The buffer filling layer, made of flame-retardant polypropylene mesh tear cord, tightly fills the gap between the armored buffer layer and the inner sheath, further enhancing the buffering effect. The outer sheath material is made of flame-retardant polyurethane. During extrusion, the molten polyurethane material directly wraps around the outermost surface of the cable-formed armored buffer layer. The polyurethane adheres tightly to each crest and trough of the corrugated tube, forming a strong mechanical bond after cooling and solidification. This creates the outer sheath on the cable surface, thereby improving the cable's abrasion resistance and service life. Through these methods, the cable's impact resistance is enhanced, preventing impact energy from being conducted to the internal insulation core, thus preventing insulation damage, short circuits, and other safety accidents. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a cross-sectional view of the entire first embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the overall structure of the second embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the positioning component according to the second embodiment of the present invention.

[0018] Figure 4 This is a structural schematic diagram of the positioning component from another perspective of the second embodiment of the present invention.

[0019] 101-Conductor, 102-Insulation part, 103-Flame retardant part, 104-Metallic shielding layer, 105-Inner sheath, 106-Armored buffer layer, 107-Buffer filling layer, 108-Outer sheath, 109-Inner insulation layer, 110-Main insulation layer, 111-Flame retardant filling layer, 112-Cable wrapping layer, 201-Positioning component, 202-Connecting part, 203-Dating part, 204-Mounting part, 205-Arc-shaped connector, 206-Connecting bolt, 207-First threaded hole, 208-First anti-slip protrusion, 209-Shaft, 210-Arc-shaped docking body, 211-Second threaded hole, 212-Second anti-slip protrusion, 213-Threaded rod, 214-Connecting rod, 215-Mounting base, 216-Mounting screw hole. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0021] The first embodiment of this application is as follows: Please see Figure 1 ,in, Figure 1 This is a cross-sectional view of the entire first embodiment of the present invention.

[0022] This invention provides a cross-linked polyethylene insulated mining power cable, comprising a conductor 1 and a protective assembly. The protective assembly includes an insulation part 102, a flame-retardant part 103, a metal shielding layer 104, an inner sheath 105, an armored buffer layer 106, a buffer filling layer 107, and an outer sheath 108. The insulation part 102 includes an inner insulation layer 109 and a main insulation layer 110. The flame-retardant part 103 includes a flame-retardant filling layer 111 and a cabling wrapping layer 112. The aforementioned solution can improve the impact resistance of the cable, prevent impact energy from being conducted to the insulated core wire inside the cable, and prevent safety accidents such as insulation damage and short circuits.

[0023] In this specific embodiment, the insulating part 102 is disposed on the outside of the conductor 1, the flame-retardant part 103 is disposed on the outside of the insulating part 102, the metal shielding layer 104 is disposed on the outer layer of the flame-retardant part 103, the inner sheath 105 is disposed on the outside of the metal shielding layer 104, the armored buffer layer 106 is disposed on the outside of the inner sheath 105, the buffer filling layer 107 is disposed between the inner sheath 105 and the armored buffer layer 106, and the outer sheath 108 is disposed on the outside of the armored buffer layer 106. The insulation part 102 is made of insulating material, and the insulation part 102 and the conductor 1 constitute an insulated core. The flame-retardant part 103 is used to provide flame-retardant effect for the cable. The metal shielding layer 104 is made of tin-plated copper wire braiding, providing flexible electromagnetic shielding and also having the characteristic of resisting repeated bending. The inner sheath 105 is made of flame-retardant polyolefin sheathing material, used to fix the internal structure and form the first flame-retardant barrier. The armored buffer layer 106 is essentially a galvanized steel corrugated pipe. The galvanized steel corrugated pipe is longitudinally welded into a tubular shape and sleeved on the outside of the cable to form the armored buffer layer 106. It provides pressure resistance and impact resistance exceeding that of steel wire armor. The corrugated structure has inherent elasticity, which can buffer external forces. The buffer filling layer 107 is made of flame-retardant polypropylene mesh tear cord, which tightly fills the gap between the armored buffer layer 106 and the inner sheath 105, further enhancing the buffering effect. The outer sheath 108 is made of flame-retardant polyurethane sheath material. When the outer sheath 108 is extruded, the molten polyurethane material directly wraps around the outermost surface of the already cabled armored buffer layer 106. The polyurethane tightly adheres to each crest and trough of the corrugated tube. After cooling and solidification, it forms a strong mechanical bond, forming the outer sheath 108 on the cable surface, thereby improving the cable's wear resistance and service life. Through the above methods, the cable's impact resistance can be improved, preventing impact energy from being conducted to the internal insulation core wires of the cable, and preventing safety accidents such as insulation damage and short circuits.

[0024] The inner insulation layer 109 is disposed on the outside of the conductor 1, and the main insulation layer 110 is disposed on the outside of the inner insulation layer 109. Irradiated polyolefin insulating material is melted and uniformly coated onto the conductor 1, forming the inner insulation layer 109 on the surface of the conductor 1. The main insulation layer 110 is made of cross-linked polyethylene insulating material. The combination of the inner insulation layer 109 and the main insulation layer 110 provides insulation. The inner insulation layer 109, the main insulation layer 110, and the conductor 1 together constitute an insulated wire core.

[0025] Secondly, the flame-retardant filler layer 111 is disposed outside the main insulation layer 110, and the cabling wrapping layer 112 is disposed between the flame-retardant filler layer 111 and the metal shielding layer 104. The flame-retardant filler layer 111 is formed by filling the outside of the main insulation layer 110 with high-temperature resistant filler rope, and the cabling wrapping layer 112 is formed by wrapping halogen-free, low-smoke flame-retardant glass cloth tape around the surfaces of the main insulation layer 110 and the flame-retardant filler layer 111, which can improve the flame-retardant effect of the cable.

[0026] In using this invention, irradiated polyolefin insulating material is melted and uniformly coated onto the conductor 1, forming the inner insulation layer 109 on the surface of the conductor 1. The main insulation layer 110 is made of cross-linked polyethylene insulating material. The combination of the inner insulation layer 109 and the main insulation layer 110 provides insulation. The inner insulation layer 109, the main insulation layer 110, and the conductor 1 together constitute the insulated wire core. A high-temperature resistant filler rope is filled outside the main insulation layer 110 to form the flame-retardant filler layer 111. Halogen-free, low-smoke, flame-retardant glass cloth tape is wrapped around the surfaces of the main insulation layer 110 and the flame-retardant filler layer 111 to form the cable wrapping layer 112, which improves the flame-retardant effect of the cable. The metal shielding layer 104 is woven from tin-plated copper wire, providing flexible electromagnetic shielding and resistance to repeated bending. The inner sheath 105 is made of flame-retardant polyolefin sheathing material, used to fix the internal structure and form the first flame-retardant barrier. The armored buffer layer 106 is essentially a galvanized steel corrugated pipe, which is longitudinally welded into a tubular shape and sleeved on the outside of the cable to form the armored buffer layer 106. It provides pressure and impact resistance exceeding that of steel wire armor, and the corrugated structure has inherent elasticity to buffer external forces. The buffer filling layer 107 is made of flame-retardant material. A polypropylene mesh tear cord tightly fills the gap between the armored buffer layer 106 and the inner sheath 105, further enhancing the buffering effect. The outer sheath 108 is made of flame-retardant polyurethane material. During the extrusion of the outer sheath 108, the molten polyurethane material directly wraps around the outermost surface of the cabled armored buffer layer 106. The polyurethane tightly adheres to each crest and trough of the corrugated tube, and after cooling and solidification, forms a strong mechanical bond, creating the outer sheath 108 on the cable surface. This improves the cable's abrasion resistance and service life. Through these methods, the cable's impact resistance is improved, preventing impact energy from being conducted to the internal insulation core, thus preventing insulation damage, short circuits, and other safety accidents.

[0027] The second embodiment of this application is as follows: Based on the first embodiment, please refer to Figures 2-4 ,in, Figure 2 This is a schematic diagram of the overall structure of the second embodiment of the present invention; Figure 3 This is a schematic diagram of the positioning component according to the second embodiment of the present invention; Figure 4 This is a structural schematic diagram of the positioning component from another perspective of the second embodiment of the present invention.

[0028] The cross-linked polyethylene insulated mining power cable provided by the present invention further includes a positioning component 201; the positioning component 201 includes a connecting part 202, a mating part 203, and a mounting part 204; the connecting part 202 includes an arc-shaped connecting body 205, a connecting bolt 206, and a first anti-slip protrusion 208; the mating part 203 includes a rotating shaft 209, an arc-shaped mating body 210, and a second anti-slip protrusion 212; the mounting part 204 includes a threaded rod 213, a connecting rod 214, and a mounting base 215.

[0029] In this specific embodiment, the connecting portion 202 is located outside the outer sheath 108, the mating portion 203 is disposed on the side of the connecting portion 202, and the mounting portion 204 is disposed on the side of the connecting portion 202. The positioning component 201 can be mounted on the outer surface of the outer sheath 108 via the connecting portion 202 and the mating portion 203, and the mounting portion 204 can be fixed on the mounting plane to fix the position of the cable.

[0030] The arc-shaped connector 205 is located outside the outer sheath 108, and has multiple first threaded holes 207 on its outer side. The connecting bolt 206 is threadedly connected to the arc-shaped connector 205 and is located on the side of the arc-shaped connector 205. The first anti-slip protrusion 208 is fixedly connected to the arc-shaped connector 205 and is located inside the arc-shaped connector 205. The connecting bolt 206 connects the arc-shaped connector 205 to the mating portion 203. When the arc-shaped connector 205 is fixed to the surface of the outer sheath 108, the first anti-slip protrusion 208 slightly sinks into the surface of the outer sheath 108 to prevent the arc-shaped connector 205 from sliding.

[0031] Secondly, the rotating shaft 209 and the arc-shaped connecting body 205 are rotatably connected and located on the side of the arc-shaped connecting body 205; the arc-shaped docking body 210 is fixedly connected to the rotating shaft 209 and located on the side of the rotating shaft 209, and the outer side of the arc-shaped docking body 210 is provided with a plurality of second threaded holes 211. The rotating shaft 209 allows the arc-shaped docking body 210 to rotate relative to the arc-shaped connecting body 205. The outer sheath 108 is placed inside the arc-shaped connecting body 205 and the arc-shaped docking body 210, and then the arc-shaped docking body 210 is rotated so that the ends of the arc-shaped docking body 210 and the arc-shaped connecting body 205 are aligned. Then, the connecting bolt 206 is screwed into the arc-shaped connecting body 205 and the arc-shaped docking body 210 to complete the connection.

[0032] Furthermore, the second anti-slip protrusion 212 is fixedly connected to the arc-shaped docking body 210 and is located inside the arc-shaped docking body 210. When the arc-shaped docking body 210 is fixed to the surface of the outer sheath 108, the second anti-slip protrusion 212 will slightly sink into the surface of the outer sheath 108 to prevent the arc-shaped docking body 210 from sliding.

[0033] Finally, the threaded rod 213 is threadedly connected to the first threaded hole 207 and located on the side of the first threaded hole 207; the connecting rod 214 is fixedly connected to the side of the threaded rod 213; the mounting base 215 is fixedly connected to the side of the connecting rod 214, and the mounting base 215 is provided with a mounting screw hole 216. A screw hole is opened at the cable installation position, and the mounting base 215 is fixed at the installation position using mounting bolts, which can fix the cable position; the threaded rod 213 is provided with threads that are compatible with the first threaded hole 207 and the second threaded hole 211, so that the threaded rod 213 can be fixed on any of the first threaded hole 207 and the second threaded hole 211, thereby adjusting the position of the mounting base 215 according to different installation positions.

[0034] When using this invention, the outer sheath 108 is placed inside the arc-shaped connector 205 and the arc-shaped docking body 210. Then, the arc-shaped docking body 210 is rotated to align the ends of the arc-shaped docking body 210 and the arc-shaped connector 205. Finally, the connecting bolt 206 is screwed into the arc-shaped connector 205 and the arc-shaped docking body 210 to complete the connection. A screw hole is made at the cable installation location, and the mounting seat 215 is fixed at the installation location using mounting bolts to fix the cable position. The positioning component 201 is easy to install and disassemble and can be used as needed.

[0035] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A cross-linked polyethylene insulated mining power cable, comprising a conductor, characterized in that, It also includes protection components; The protective component includes an insulating part, a flame-retardant part, a metal shielding layer, an inner sheath, an armored buffer layer, a buffer filling layer, and an outer sheath. The insulating part is disposed on the outside of the conductor, the flame-retardant part is disposed on the outside of the insulating part, the metal shielding layer is disposed on the outer layer of the flame-retardant part, the inner sheath is disposed on the outside of the metal shielding layer, the armored buffer layer is disposed on the outside of the inner sheath, the buffer filling layer is disposed between the inner sheath and the armored buffer layer, and the outer sheath is disposed on the outside of the armored buffer layer.

2. The cross-linked polyethylene insulated mining power cable as described in claim 1, characterized in that, The insulating portion includes an inner insulating layer and a main insulating layer; the inner insulating layer is disposed on the outside of the conductor, and the main insulating layer is disposed on the outside of the inner insulating layer.

3. The cross-linked polyethylene insulated mining power cable as described in claim 2, characterized in that, The flame-retardant part includes a flame-retardant filling layer and a cable wrapping layer; the flame-retardant filling layer is disposed outside the main insulation layer, and the cable wrapping layer is disposed between the flame-retardant filling layer and the metal shielding layer.

4. The cross-linked polyethylene insulated mining power cable as described in claim 3, characterized in that, The cross-linked polyethylene insulated mining power cable also includes a positioning component; the positioning component is located outside the outer sheath.

5. The cross-linked polyethylene insulated mining power cable as described in claim 4, characterized in that, The positioning component includes a connecting part, a docking part, and a mounting part; the connecting part is located outside the outer sheath, the docking part is disposed on the side of the connecting part, and the mounting part is disposed on the side of the connecting part.

6. The cross-linked polyethylene insulated mining power cable as described in claim 5, characterized in that, The connecting part includes an arc-shaped connector, a connecting bolt, and a first anti-slip protrusion; the arc-shaped connector is located outside the outer sheath, and the outer side of the arc-shaped connector is provided with a plurality of first threaded holes; the connecting bolt is threadedly connected to the arc-shaped connector and is located on the side of the arc-shaped connector; the first anti-slip protrusion is fixedly connected to the arc-shaped connector and is located inside the arc-shaped connector.

7. The cross-linked polyethylene insulated mining power cable as described in claim 6, characterized in that, The docking part includes a rotating shaft and an arc-shaped docking body; the rotating shaft and the arc-shaped docking body are rotatably connected and located on the side of the arc-shaped docking body; the arc-shaped docking body and the rotating shaft are fixedly connected and located on the side of the rotating shaft, and the outer side of the arc-shaped docking body is provided with a plurality of second threaded holes.

Images