Metal armored polyvinyl chloride sheath communication cable for coal mine

Abstract

The invention discloses a metal armored polyvinyl chloride sheath communication cable for a coal mine, and belongs to the technical field of mining communication optical cables, the metal armored polyvinyl chloride sheath communication cable comprises a flame-retardant polyvinyl chloride sheath, a plurality of groups of steel wire armored control mechanisms are arranged in the flame-retardant polyvinyl chloride sheath at equal intervals, and a plurality of high-strength wires are arranged in the flame-retardant polyvinyl chloride sheath in parallel; the high-strength lines are made of aramid fibers and are in a flat belt shape. By arranging the steel wire armoring control mechanism, on the premise that the protection effect of the armoring layer is not affected, the overall quality of the optical cable is reduced, the bending performance of the cable is improved, the cable can be laid and maintained in a mine more efficiently, and graded energy absorption is achieved. And through gap closing and friction energy consumption of the armored steel wires and local densification of the armored steel wires, the final compressive strength is provided.

Description

Technical Field

[0001] The invention belongs to the technical field of mine communication optical cables, and in particular relates to a metal armored polyvinyl chloride sheathed communication cable for coal mines. Background Art

[0002] The underground environment of coal mines is special, with harsh conditions such as flammable gas and coal dust, high humidity, possible water seepage, and mechanical stress and shock. In this environment, building a reliable communication network is crucial for safe production scheduling, monitoring and emergency rescue. As the transmission core, communication optical cables must first meet extremely high flame retardant safety requirements and strictly prevent them from becoming a source of fire or a combustion aid. At the same time, they must have excellent moisture and water resistance to resist moisture and water damage, and have sufficient mechanical strength and impact resistance to adapt to the complex laying conditions and external forces of the tunnels. Therefore, communication optical cables designed specifically for mines need to integrate key protective properties such as flame retardancy, moisture resistance, and impact resistance to ensure the safety and stability of signal transmission under extreme conditions. They are the nerves that ensure the safe and efficient operation of mines.

[0003] The existing technology has the following shortcomings: First, metal materials will generate electric sparks when rubbed or broken, posing a serious safety hazard and failing to meet the explosion-proof requirements of high-gas mines; second, the steel wire has a low elongation at break and is very brittle, prone to sudden breakage under impact loads, and exhibits significant stress concentration; finally, the tightly twisted steel wire structure results in heavy and rigid optical cables, which not only increases material costs but also makes construction and laying difficult, making it difficult to adapt to the complex tunnel directions of mines. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a metal armored polyvinyl chloride sheathed communication cable for coal mines, which solves the problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a metal armored polyvinyl chloride sheathed communication cable for coal mines, comprising: A flame-retardant polyvinyl chloride sheath, wherein a plurality of groups of steel wire armor control mechanisms are equidistantly arranged in the flame-retardant polyvinyl chloride sheath, and a plurality of high-strength wires are arranged in parallel in the flame-retardant polyvinyl chloride sheath, wherein the high-strength wires are made of aramid fibers and are in the form of flat ribbons; The steel wire armor control mechanism includes two control plates fixedly connected to the flame retardant polyvinyl chloride sheath, a twisted plate is rotatably connected between the two control plates, a self-lubricating bushing is provided between the twisted plate and the control plate, threading holes are provided at the positions corresponding to the high-strength wires on the twisted plate and the control plate, a fixed anchor point is provided in the threading hole on the twisted plate, the high-strength wire is fixedly connected in the fixed anchor point, the threading holes on the twisted plate and the control plate are not on the same axis, and a plurality of rotating seats are fixedly connected to the side close to each other of each pair of control plates, a telescopic sleeve is rotatably connected in the rotating seat, a compression spring is installed on the outer sleeve of the telescopic sleeve, and the output end of the telescopic sleeve and the compression spring are both rotatably connected to the twisted plate.

[0006] As a further solution of the present invention: the stranded plate is provided with a plurality of limiting holes equidistantly along its radial direction, armored steel wires are arranged in the limiting holes, and the plurality of armored steel wires are in a screw-connected state with certain gaps between them.

[0007] As a further solution of the present invention: a through hole is opened at the axis center of the stranded plate, a bundle tube is arranged in the through hole, a plurality of loose tubes are arranged in the bundle tube, and optical fibers are arranged in the loose tubes.

[0008] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention uses high-strength wires made of multiple aramid fibers to replace the parallel steel wires in traditional central tube optical cables. Because aramid is an absolute insulator, it can completely eliminate sparks caused by metal friction or fracture, making it safer and more reliable in use scenarios such as gas mines. It also meets the requirements of mining explosion-proof standards such as GB 3836 / IECEx for non-metallic materials. More importantly, the elongation at break of aramid fiber is approximately 3.5%, which is much higher than that of ordinary parallel steel wires (<1%). Multiple high-strength wires composed of aramid fibers can better disperse stress, making them more suitable for use under mining conditions. In addition, the high-strength wires used in the present invention are flat, with a larger stress-bearing area, which can avoid local cutting of the polyvinyl chloride sheath. Secondly, the present invention provides a steel wire armor control mechanism to reduce the overall weight of the optical cable without affecting the protective effect of the armor layer, and improve the bending performance of the cable, so that it can be laid and maintained in mines more efficiently; Finally, the present invention achieves graded energy absorption: first, the high-strength aramid fiber wire absorbs part of the impact energy to achieve flexible buffering, then the gaps in the armored steel wire are closed, friction energy is dissipated, and finally the armored steel wire is locally densified to provide the final compressive strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional internal structure of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the twisted plate portion of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the rotating seat part of the present invention; Figure 5 Schematic diagram of the distribution of high-strength wires of the present invention.

[0010] In the figure: 1. Flame-retardant PVC sheath; 2. High-strength wire; 3. Wire control plate; 4. Twisted plate; 5. Threading hole; 6. Rotating seat; 7. Telescopic sleeve; 8. Compression spring; 9. Limit hole; 10. Armored steel wire; 11. Through hole; 12. Bundle tube; 13. Loose tube. DETAILED DESCRIPTION

[0011] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0012] like Figure 1-Figure 5 As shown, the present invention provides a technical solution: A metal armored polyvinyl chloride sheathed communication cable for coal mines, comprising: A flame-retardant polyvinyl chloride sheath 1 is provided with a plurality of groups of steel wire armored control mechanisms arranged at equal intervals in the flame-retardant polyvinyl chloride sheath 1. A plurality of high-strength wires 2 are arranged in parallel in the flame-retardant polyvinyl chloride sheath 1. The high-strength wires 2 are made of aramid fiber and are in the shape of a flat ribbon. Generally, two parallel steel wires are added to the outer sheath of a central tube communication optical cable to improve the overall tensile strength of the cable. In the present invention, a plurality of high-strength wires 2 made of aramid fibers are used instead of parallel steel wires. Since aramid is an absolute insulator, it can completely eliminate the electric sparks generated by metal friction or fracture, which is safer and more reliable in use scenarios such as gas mines, and also meets GB 3836 / IECEx and other mining explosion-proof standards for non-metallic materials. More importantly, the breaking elongation of aramid fiber is about 3.5%, which is much higher than that of ordinary parallel steel wire (<1%). Multiple high-strength wires 2 composed of aramid fibers can better disperse stress and are more suitable for use under mining conditions. In addition, the high-strength wires 2 used in the present invention are flat, with a larger stress-bearing area, which can avoid local cutting of the polyvinyl chloride sheath. The steel wire armor control mechanism includes two control plates 3 fixedly connected to the flame retardant polyvinyl chloride sheath 1, a twisted plate 4 is rotatably connected between the two control plates 3, a self-lubricating bushing is provided between the twisted plate 4 and the control plate 3, and a threading hole 5 is provided on the twisted plate 4 and the control plate 3 corresponding to the position of the high-strength wire 2. A fixed anchor point is provided in the threading hole 5 on the twisted plate 4, and the high-strength wire 2 is fixedly connected to the fixed anchor point. The threading holes 5 on the twisted plate 4 and the control plate 3 are not on the same axis, and each pair of control plates 3 are fixedly connected to a plurality of rotating seats 6 on the side close to each other. A telescopic sleeve rod 7 is rotatably connected to the rotating seat 6, and a compression spring 8 is installed on the outside of the telescopic sleeve rod 7. The output end of the telescopic sleeve rod 7 and the compression spring 8 are rotatably connected to the stranded plate 4. The stranded plate 4 is provided with a plurality of limiting holes 9 equidistant along its radial direction. An armored steel wire 10 is arranged in the limiting hole 9. The multiple armored steel wires 10 are in a screw-fit state and a certain gap is left between each other. A through hole 11 is provided at the axial center position of the stranded plate 4, and a bundle tube 12 is provided in the through hole 11. A plurality of loose tubes 13 are provided in the bundle tube 12, and an optical fiber is provided in the loose tube 13. The steel wire armor used in traditional central tube communication optical cables is made by twisting multiple spiral steel wires together. Adjacent steel wires are tightly fitted together to form a stable armor layer. However, there are problems with this: the overall weight of the cable is large, and transportation and construction costs are high. Especially in mine construction environments, due to the narrow space, the tight twisting of the armor steel wires 10 results in poor bending performance of the optical cable, and the minimum bending radius is extremely large, making it difficult to adapt to the complex mine directions. The purpose of setting the steel wire armor control mechanism in the present invention is to reduce the overall quality of the optical cable without affecting the protective effect of the armor layer, improve the bending performance of the cable, and make it more efficient to lay and maintain it in the mine. When the optical cable is impacted, the high-strength wire 2 at the impact position is first bent by force, and the force on the high-strength wire 2 between the two adjacent fixed anchor points will cause the twisted plate 4 of the corresponding fixed anchor point to rotate a certain angle relative to the control plate 3 to adapt to the deformation of the high-strength wire 2. The rotation of the twisted plate 4 will cause the limiting hole 9 on it to rotate accordingly. Since the twisted plate 4 and the threading hole 5 on the control plate 3 are not on the same axis, the normal When the high-strength wire 2 is located in the stranded plate 4 in the state, due to the difference in the position of the threading hole 5, a certain deflection will occur. It should be noted that the deflection of the high-strength wire 2 at the positions of the two adjacent stranded plates 4 is in different directions, so the stranded plates 4 on both sides of the impact position will rotate in opposite directions, so that the armored steel wire 10 at the impact position is spirally tightened to form a local high-density protection area. At the same time, the telescopic sleeve 7 and the compression spring 8 in the rotating seat 6 are compressed. When the impact disappears, in order to ensure sustainable use, the compressed telescopic sleeve 7 and the compression spring 8 will reset the stranded plate 4, and the high-strength wire 2 can be reset again to cope with subsequent possible impacts. When traditional steel wire armor is impacted, the impact load is directly transmitted through the metal, resulting in stress concentration. Even slight local deformation can cause permanent damage to the armor. The solution of the present invention achieves graded energy absorption: first, the high-strength wire 2 made of aramid fiber absorbs part of the impact energy to achieve flexible buffering, then the gaps in the armored steel wire 10 are closed, friction energy is dissipated, and finally the armored steel wire 10 is locally densified to provide ultimate compressive strength.

[0013] The working principle of the present invention is: First, a flame-retardant polyvinyl chloride sheath 1 is used. The flame-retardant polyvinyl chloride sheath 1 has good flame retardancy, explosion-proof, and corrosion-resistant properties. Generally, two parallel steel wires are added to the outer sheath of a central tube communication optical cable to improve the overall tensile strength of the cable. In the present invention, a high-strength wire 2 made of multiple aramid fibers is used instead of the parallel steel wires. Since aramid is an absolute insulator, it can completely eliminate the electric sparks generated by metal friction or fracture, making it safer and more reliable in use scenarios such as gas mines. It also meets the requirements of mining explosion-proof standards such as GB 3836 / IECEx for non-metallic materials. More importantly, the elongation at break of aramid fiber is approximately 3.5%, which is much higher than that of general parallel steel wires (<1%). Multiple high-strength wires 2 composed of aramid fibers can better disperse stress, making it more suitable for use under mining conditions. In addition, the high-strength wire 2 used in the present invention is flat, with a larger stress-bearing area, which can avoid local cutting of the polyvinyl chloride sheath. The steel wire armor used in traditional central tube communication optical cables is made by twisting multiple spiral steel wires together. Adjacent steel wires are tightly fitted together to form a stable armor layer. However, there are problems with this: the overall weight of the cable is large, and transportation and construction costs are high. Especially in mine construction environments, due to the narrow space, the tight twisting of the armor steel wires 10 results in poor bending performance of the optical cable, and the minimum bending radius is extremely large, making it difficult to adapt to the complex mine directions. The purpose of setting the steel wire armor control mechanism in the present invention is to reduce the overall quality of the optical cable without affecting the protective effect of the armor layer, improve the bending performance of the cable, and make it more efficient to lay and maintain it in the mine. When the optical cable is impacted, the high-strength wire 2 at the impact position is first bent by force, and the force on the high-strength wire 2 between the two adjacent fixed anchor points will cause the twisted plate 4 of the corresponding fixed anchor point to rotate a certain angle relative to the control plate 3 to adapt to the deformation of the high-strength wire 2. The rotation of the twisted plate 4 will cause the limiting hole 9 on it to rotate accordingly. Since the twisted plate 4 and the threading hole 5 on the control plate 3 are not on the same axis, the normal When the high-strength wire 2 is located in the stranded plate 4 in the state, due to the difference in the position of the threading hole 5, a certain deflection will occur. It should be noted that the deflection of the high-strength wire 2 at the positions of the two adjacent stranded plates 4 is in different directions, so the stranded plates 4 on both sides of the impact position will rotate in opposite directions, so that the armored steel wire 10 at the impact position is spirally tightened to form a local high-density protection area. At the same time, the telescopic sleeve 7 and the compression spring 8 in the rotating seat 6 are compressed. When the impact disappears, in order to ensure sustainable use, the compressed telescopic sleeve 7 and the compression spring 8 will reset the stranded plate 4, and the high-strength wire 2 can be reset again to cope with subsequent possible impacts. When traditional steel wire armor is impacted, the impact load is directly transmitted through the metal, resulting in stress concentration. Even slight local deformation can cause permanent damage to the armor. The solution of the present invention achieves graded energy absorption: first, the high-strength wire 2 made of aramid fiber absorbs part of the impact energy to achieve flexible buffering, then the gaps in the armored steel wire 10 are closed, friction energy is dissipated, and finally the armored steel wire 10 is locally densified to provide ultimate compressive strength.

[0014] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A metal armored polyvinyl chloride sheathed communication cable for coal mines, characterized in that: include: A flame-retardant polyvinyl chloride sheath (1), wherein a plurality of groups of steel wire armor control mechanisms are equidistantly arranged in the flame-retardant polyvinyl chloride sheath (1), and a plurality of high-strength wires (2) are arranged in parallel in the flame-retardant polyvinyl chloride sheath (1), wherein the high-strength wires (2) are made of aramid fibers and are in the shape of flat ribbons; The steel wire armor control mechanism comprises two wire control plates (3) fixedly connected to the flame retardant polyvinyl chloride sheath (1), a twisted plate (4) is rotatably connected between the two wire control plates (3), a self-lubricating bushing is provided between the twisted plate (4) and the wire control plate (3), and threading holes (5) are provided on the twisted plate (4) and the wire control plate (3) at positions corresponding to the high-strength wire (2), a fixed anchor point is provided in the threading hole (5) on the twisted plate (4), and the high-strength wire (2) is provided in the threading hole (5). ) is fixedly connected in a fixed anchor point, the threading holes (5) on the twisted plate (4) and the control plate (3) are not on the same axis, and a plurality of rotating seats (6) are fixedly connected on the side close to each other of each pair of control plates (3), a telescopic sleeve (7) is rotatably connected in the rotating seat (6), a compression spring (8) is installed on the outside of the telescopic sleeve (7), and the output end of the telescopic sleeve (7) and the compression spring (8) are both rotatably connected to the twisted plate (4).

2. The metal armored polyvinyl chloride sheathed communication cable for coal mines according to claim 1, characterized in that: The stranded plate (4) is provided with a plurality of limiting holes (9) at equal intervals along its radial direction, and armored steel wires (10) are arranged in the limiting holes (9). The plurality of armored steel wires (10) are in a screw-connected state with certain gaps between them.

3. The metal armored polyvinyl chloride sheathed communication cable for coal mines according to claim 2, characterized in that: A through hole (11) is provided at the axis center of the stranded plate (4), a bundle tube (12) is provided in the through hole (11), a plurality of loose tubes (13) are provided in the bundle tube (12), and optical fibers are provided in the loose tubes (13).

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