Long-distance symmetrical cable
By designing a multi-layer compression resistance mechanism in long-distance symmetric cables, the problem of insufficient compression resistance of existing cables is solved, and multiple punch protection for the wire core is achieved, ensuring signal stability and long-distance communication continuity.
Patent Information
- Application Number
- CN202411701632.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-03-18
AI Technical Summary
Existing long-distance symmetrical cables have weak compressive resistance and are prone to core breakage when excavated by strong excavation tools, resulting in signal interruption and affecting long-distance communication.
A long-distance symmetrical cable including a pull rope and a compression mechanism is designed. The compression mechanism consists of a multi-layer compression sleeve, an arc-shaped compression shell, a curved compression strip, a compressive piece, a tough strip and an auxiliary sleeve. Through the mutual cooperation of these components, multiple anti-stamp protection is provided.
It effectively improves the punch resistance of long-distance symmetrical cables, avoids the breakage of the wire core during excavation of excavation tools, and ensures the stability of the signal and the continuity of long-distance communication.
Smart Images
Figure CN119650149A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of cables, in particular to a long-distance symmetrical cable. Background Art
[0002] A cable is a device for transmitting electric energy or signals. It is usually a transmission line composed of one or more mutually insulated conductive cores placed in a sealed sheath. It is generally used in the fields of power transmission, communications, industrial control systems, transportation systems, etc. Common cables include long-distance symmetrical cables, power cables, coaxial cables, and fiber optic cables.
[0003] In the existing technology, the existing long-distance symmetrical cables ensure the smooth conduct of a large number of telephone communications during actual use, allowing people in different locations to communicate over long distances through the telephone. However, their anti-punch ability is weak. When the buried long-distance symmetrical cables are excavated by strong excavation tools, the cores of the long-distance symmetrical cables with weak pressure resistance will break, resulting in signal interruption, which affects the long-distance communication between people in different locations through the telephone.
[0004] Therefore, we propose a long-distance symmetrical 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 a long-distance symmetrical cable to solve the problem that the existing long-distance symmetrical cable has weak compressive resistance. When the buried long-distance symmetrical cable is excavated by a strong excavation tool, the core of the long-distance symmetrical cable with weak compressive resistance will break, resulting in signal interruption, which affects the problem of long-distance communication between people in different locations through the telephone.
[0006] To achieve the above object, the present invention provides the following technical solution: a long-distance symmetrical cable, comprising a cable body, wherein the cable body comprises a tensile rope and a compression-resistant mechanism; The anti-pressure mechanism includes a first anti-pressure sleeve, a corrugated anti-pressure sleeve and an outer auxiliary sleeve, a plurality of first arc-shaped holes are equidistantly provided on one side of the first anti-pressure sleeve, an arc-shaped anti-pressure shell is arranged inside each of the first arc-shaped anti-pressure shells, an arc-shaped anti-pressure strip is arranged inside each of the arc-shaped anti-pressure shells, a second anti-pressure sleeve is arranged on the outer wall of the first anti-pressure sleeve, a plurality of second arc-shaped holes are equidistantly provided on one side of the second anti-pressure sleeve, an anti-pressure part is arranged inside each of the second arc-shaped hole covers, an inner auxiliary sleeve is arranged on the outer wall of the second anti-pressure sleeve, a plurality of first anti-pressure tough strips are arranged between the inner auxiliary sleeve and the corrugated anti-pressure sleeve, a plurality of second anti-pressure tough strips are arranged between the outer auxiliary sleeve and the corrugated anti-pressure sleeve, and a protective sleeve is arranged on the outer wall of the outer auxiliary sleeve.
[0007] Preferably, multiple first-anti-compression toughness strips and multiple second-anti-compression toughness strips are arranged in an alternating manner, and the outer surface of each first-anti-compression toughness strip contacts the inner wall of the corrugated compression-resistant sleeve, and the outer surface of each first-anti-compression toughness strip contacts the inner wall of each groove of the inner auxiliary sleeve respectively.
[0008] Preferably, the outer surface of each of the second compression-resistant tough strips is in contact with the outer wall of the corrugated compression-resistant sleeve, and the outer surface of the second compression-resistant tough strips is in contact with the inner wall of each groove of the outer auxiliary sleeve respectively.
[0009] Preferably, each included angle inside each of the first arc-shaped holes is a curved surface, and each included angle inside each of the second arc-shaped holes is a curved surface.
[0010] Preferably, a rope loop is provided on the outer surface of the tensile rope, and four groups of wire cores are evenly distributed on the outer surface of the rope loop.
[0011] Preferably, the number of the wire cores in each group is two, the outer surface of each wire core is provided with an insulating layer, the eight insulating layers are divided into four groups, and the insulating layers in each group are twisted with each other.
[0012] Preferably, a filling layer is arranged between the outer walls of the plurality of insulating layers and the outer wall of the rope loop, and the outer wall of the filling layer is bonded to the inner wall of the first pressure-resistant sleeve.
[0013] Preferably, the outer wall of the protective sleeve is provided with an electromagnetic shielding layer, and the outer wall of the electromagnetic shielding layer is provided with a waterproof layer.
[0014] Preferably, the outer wall of the waterproof layer is provided with an armor layer, and the outer wall of the steel wire armor layer is provided with a heat insulation layer.
[0015] Preferably, the outer wall of the heat insulation layer is provided with an outer shielding layer, the outer wall of the outer shielding layer is provided with a corrosion-resistant layer, and the outer wall of the corrosion-resistant layer is provided with a wear-resistant layer.
[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can improve the anti-punching ability of long-distance symmetrical cables by arranging a pressure-resistant mechanism, that is, when the long-distance symmetrical cables are excavated by excavating tools with strong force, the wire core will not break, causing signal interruption, which not only effectively improves the use effect of the long-distance symmetrical cables, but also improves the use efficiency of the long-distance symmetrical cables. The first level of anti-punching protection for the wire core can be achieved through the cooperation of the protective sleeve, the inner auxiliary sleeve, the outer auxiliary sleeve, the corrugated pressure-resistant sleeve, the first pressure-resistant tough strip and the second pressure-resistant tough strip. The second level of anti-punching protection for the wire core can be achieved through the cooperation of the second pressure-resistant sleeve, the pressure-resistant part, the first pressure-resistant sleeve, the arc-shaped pressure-resistant shell and the arc-shaped pressure-resistant strip.
[0017] 2. The present invention can enable people in different locations to communicate over long distances through telephones by setting up a cable body. The tensile strength of the long-distance symmetrical cable can be improved by the action of the tensile rope. The anti-electromagnetic interference effect of the long-distance symmetrical cable can be improved by the cooperation of the electromagnetic shielding layer, the outer shielding layer and the armor layer. The service life of the long-distance symmetrical cable can be improved by the cooperation of the heat insulation layer, the corrosion-resistant layer and the wear-resistant layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A three-dimensional diagram of a long-distance symmetrical cable of the present invention; Figure 2 It is a schematic diagram of the structure of the long-distance symmetrical cable of the present invention; Figure 3 It is a three-dimensional diagram of the compression resistance mechanism of the long-distance symmetrical cable of the present invention; Figure 4 A three-dimensional diagram of the outer auxiliary sleeve of the long-distance symmetrical cable of the present invention; Figure 5 A three-dimensional diagram of the inner auxiliary sleeve of the long-distance symmetrical cable of the present invention; Figure 6 A three-dimensional diagram of a compression-resistant component of a long-distance symmetrical cable of the present invention; Figure 7 A three-dimensional diagram of the corrugated compression sleeve of the long-distance symmetrical cable of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the arc-shaped anti-compression strip and the arc-shaped anti-compression strip of the long-distance symmetrical cable of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the core and insulation layer of the long-distance symmetrical cable of the present invention.
[0019] In the figure: 1. cable body; 101. tensile rope; 102. rope loop; 103. core; 104. insulation layer; 105. filling layer; 106. pressure-resistant mechanism; 1061. first pressure-resistant sleeve; 1062. first arc-shaped hole; 1063. arc-shaped pressure-resistant strip; 1064. arc-shaped pressure-resistant shell; 1065. second pressure-resistant sleeve; 1066. second arc-shaped hole; 1067. pressure-resistant part; 1068. inner auxiliary sleeve; 1069. corrugated pressure-resistant sleeve; 10610. first pressure-resistant tough strip; 10611. second pressure-resistant tough strip; 10612. outer auxiliary sleeve; 10613. protective sleeve; 107. electromagnetic shielding layer; 108. waterproof layer; 109. armor layer; 110. thermal insulation layer; 111. outer shielding layer; 112. corrosion-resistant layer; 113. wear-resistant layer. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] Example 1: Please refer to Figure 1-Figure 8 As shown, the present invention provides a technical solution: a long-distance symmetrical cable, comprising a cable body 1, the cable body 1 comprising a tensile rope 101 and a pressure-resistant mechanism 106, the pressure-resistant mechanism 106 comprising a first pressure-resistant sleeve 1061, a corrugated pressure-resistant sleeve 1069 and an outer auxiliary sleeve 10612, a first pressure-resistant sleeve 1061 is evenly distributed on one side with a plurality of first arc-shaped holes 1062, each first arc-shaped hole 1062 is provided with an arc-shaped pressure-resistant shell 1064 inside, each The arc-shaped pressure-resistant shell 1064 is provided with an arc-shaped pressure-resistant strip 1063 inside, the outer wall of the first pressure-resistant sleeve 1061 is provided with a second pressure-resistant sleeve 1065, a plurality of second arc-shaped holes 1066 are evenly distributed on one side of the second pressure-resistant sleeve 1065, and each second arc-shaped hole cover 1066 is provided with a pressure-resistant member 1067 inside, and the outer wall of the second pressure-resistant sleeve 1065 is provided with an inner auxiliary sleeve 1068, and between the inner auxiliary sleeve 1068 and the corrugated pressure-resistant sleeve 1069 A plurality of first compression-resistant tough strips 10610 are provided, a plurality of second compression-resistant tough strips 10611 are provided between the outer auxiliary sleeve 10612 and the corrugated compression-resistant sleeve 1069, a protective sleeve 10613 is provided on the outer wall of the outer auxiliary sleeve 10612, the plurality of first compression-resistant tough strips 10610 and the plurality of second compression-resistant tough strips 10611 are arranged in an interlaced manner, the outer surface of each first compression-resistant tough strip 10610 is in contact with the inner wall of the corrugated compression-resistant sleeve 1069, and each first The outer surface of the compression-resistant tough strip 10610 is in contact with the inner wall of each groove of the inner auxiliary sleeve 1068, the outer surface of each second compression-resistant tough strip 10611 is in contact with the outer wall of the corrugated compression-resistant sleeve 1069, the outer surface of the second compression-resistant tough strip 10611 is in contact with the inner wall of each groove of the outer auxiliary sleeve 10612, each angle inside each first arc-shaped hole 1062 is an arc surface, and each angle inside each second arc-shaped hole 1066 is an arc surface.
[0022] In this embodiment, when the buried long-distance symmetrical cable is excavated by an excavation tool and the protective sleeve 10613 is squeezed by an external force, the protective sleeve 10613 can first reduce the squeezing of the wire core 103 by the external force, and then the outer auxiliary sleeve 10612, the first compression toughness strip 10610, the second compression toughness strip 10611, the corrugated compression sleeve 1069 and the inner auxiliary sleeve 1068 can be used to reduce the squeezing of the wire core 103 by the external force again, and then the second compression toughness strip 10611 can be used to reduce the squeezing of the wire core 103 by the external force. The cooperation of the sleeve 1065, the second arc-shaped hole 1066 and the pressure-resistant part 1067 can further reduce the squeezing of the wire core 103 by the external force. Then, the cooperation of the first pressure-resistant sleeve 1061, the first arc-shaped hole 1062, the arc-shaped pressure-resistant strip 1063 and the arc-shaped pressure-resistant shell 1064 can further reduce the squeezing of the wire core 103 by the external force, that is, avoid the wire core 103 from breaking when it is excavated by a strong excavation tool, thereby ensuring that people in different locations can communicate over long distances through the telephone.
[0023] Embodiment 2: According to Figure 1 , Figure 2 and Fig. 9 As shown, the outer surface of the tensile rope 101 is provided with a rope loop 102, and four groups of wire cores 103 are evenly distributed on the outer surface of the rope loop 102, and the number of wire cores 103 in each group is two. The outer surface of each wire core 103 is provided with an insulating layer 104, and the eight insulating layers 104 are divided into four groups. The insulating layers 104 in each group are twisted with each other. A filling layer 105 is provided between the outer walls of the plurality of insulating layers 104 and the outer wall of the rope loop 102, and the outer wall of the filling layer 105 is connected to the first tensile rope 101. The inner walls of the compression sleeve 1061 are bonded together, the outer wall of the protective sleeve 10613 is provided with an electromagnetic shielding layer 107, the outer wall of the electromagnetic shielding layer 107 is provided with a waterproof layer 108, the outer wall of the waterproof layer 108 is provided with an armor layer 109, the outer wall of the steel wire armor layer 109 is provided with a heat insulation layer 110, the outer wall of the heat insulation layer 110 is provided with an outer shielding layer 111, the outer wall of the outer shielding layer 111 is provided with a corrosion-resistant layer 112, and the outer wall of the corrosion-resistant layer 112 is provided with a wear-resistant layer 113.
[0024] In this embodiment, when the long-distance symmetrical cable is pulled during the laying process, the cooperation of the wear-resistant layer 113, the armor layer 109 and the anti-tension rope 101 can prevent the long-distance symmetrical cable from breaking when being pulled. When the long-distance symmetrical cable is buried in the ground for a long time, the cooperation of the corrosion-resistant layer 112, the waterproof layer 108 and the insulating layer 104 can improve the service life of the long-distance symmetrical cable, that is, prevent the long-distance symmetrical cable from being corroded and damaged by certain substances in the soil, and at the same time prevent water in the soil from entering the interior of the long-distance symmetrical cable. When the buried long-distance cable is subject to external electromagnetic interference, the cooperation of the electromagnetic shielding layer 107 and the outer shielding layer 111 can prevent external electromagnetic interference on the core 103 of the long-distance symmetrical cable. When the long-distance symmetrical cable is exposed to high temperature during the laying process, the heat insulation layer 110 can prevent the heat from the skin of the long-distance symmetrical cable from being transferred to its interior, thereby affecting the normal use of the core 103.
[0025] The effect and working principle of the whole mechanism are as follows: when the buried long-distance symmetrical cable is dug by the digging tool and the protective sleeve 10613 is squeezed by the external force, the external force on the wire core 103 can be reduced by the protective sleeve 10613, and then the external force on the wire core 103 can be reduced again by the cooperation of the outer auxiliary sleeve 10612, the first compression toughness strip 10610, the second compression toughness strip 10611, the corrugated compression sleeve 1069 and the inner auxiliary sleeve 1068. The extrusion of the core 103 by the external force is further reduced by the cooperation of the second anti-pressure sleeve 1065, the second arc-shaped hole 1066 and the anti-pressure piece 1067. Then, the cooperation of the first anti-pressure sleeve 1061, the first arc-shaped hole 1062, the arc-shaped anti-pressure strip 1063 and the arc-shaped anti-pressure shell 1064 can further reduce the extrusion of the core 103 by the external force, that is, to avoid the core 103 from being broken when the core 103 is excavated by a strong excavation tool. When the long-distance symmetrical cable is pulled during the laying process, the wear-resistant layer 113, the armor layer 109 and the anti-tension rope 101 cooperate to prevent the long-distance symmetrical cable from breaking when being pulled. When the long-distance symmetrical cable is buried in the ground for a long time, the corrosion-resistant layer 112, the waterproof layer 108 and the insulating layer 104 cooperate to improve the service life of the long-distance symmetrical cable, that is, to prevent the long-distance symmetrical cable from being corroded and damaged by certain substances in the soil, and to prevent water in the soil from entering the interior of the long-distance symmetrical cable. When the buried long-distance cable is subject to external electromagnetic interference, the electromagnetic shielding layer 107 and the outer shielding layer 111 cooperate to prevent external electromagnetic interference on the core 103 of the long-distance symmetrical cable. When the long-distance symmetrical cable is exposed to high temperature during the laying process, the heat insulation layer 110 can reduce the heat transfer from the skin of the long-distance symmetrical cable to the core 103, which affects the normal use of the core 103.
[0026] The tensile rope 101 is made of high-strength fiber (aramid fiber, polyester fiber or glass fiber) or metal material (steel wire or copper wire). The steps for making high-strength fibers are: 1. First comb the bundled fibers to make them loose and uniform, and then remove the knots, entanglements and other undesirable conditions to facilitate subsequent processing operations; 2. Combine the arranged fibers according to the required quantity, and use equipment (which is a doubling device that can ensure that the fibers are closely and evenly arranged during the doubling process) to twist the fibers together to form a thicker fiber rope; 3. Perform the initial twisting operation on the formed thick fiber rope, the operation is as follows: fix one end of the fiber rope with a tool, and then pass the other end of the fiber rope through a twisting machine (the twist degree is determined according to the specific design requirements) and other equipment to twist it in a certain twist direction (clockwise or counterclockwise) so that the fiber rope initially forms a spiral structure; 4. The fiber rope after the initial twisting is subjected to a re-twisting operation, that is, several initially twisted fiber ropes are put together again (the number of fibers is selected according to actual conditions), and then the above step 3 is repeated, and the fiber rope is twisted in a twist direction opposite to the initial twisting, so that a tensile rope 101 with high strength and stability can be obtained.
[0027] The steps for making metal materials are: 1. The steel wire or copper wire is first drawn, that is, the steel wire or copper wire is drawn multiple times using a drawing machine (during the drawing process, the internal structure of the steel wire will be optimized and the strength will be improved) to gradually reduce its diameter to the required size; 2. Twisting the drawn steel wires or copper wires (the number of wires is selected according to actual needs) using a twisting machine and in a certain twisting method (regular twisting means that each layer of wires is twisted around the central wire, and composite twisting means that multiple layers are twisted on the basis of regular twisting) can obtain a tensile rope 101 with high strength and stability.
[0028] The insulating layer 104 is made of polyethylene, polyvinyl chloride or rubber. Attachment method: Extrusion method: 1. Material preparation: Prepare the selected insulating materials according to the specifications and quality required by the cable design (ensure that the purity, particle size, etc. of the materials meet the production standards, and dry the materials).
[0029] 2. Extruder preheating: Preheat all parts of the extruder, including the barrel, screw, die, mold, etc. (preheating can enable the material to flow smoothly during the extrusion process and reach a suitable plasticized state).
[0030] 3. Add ingredients: Add the prepared insulating material particles into the barrel of the extruder (during the feeding process, pay attention to maintaining the uniformity of the feeding to avoid feed breakage or blockage caused by excessive feeding).
[0031] 4. Extrusion: The extruder is started, and the screw rotates in the barrel to push the insulating material in the barrel forward. During the pushing process, the material is sheared and squeezed by the screw, gradually plasticized and forms a uniform melt. Then, the melt is extruded through the die and the mold, and directly coated on the surface of the wire core 103 to form an insulating layer 104.
[0032] 5. Cooling and shaping: The newly extruded insulating layer 104 is immediately cooled and shaped (usually by air cooling or water cooling).
[0033] The filling layer 105 is glass fiber or polyester fiber, and is generally filled by: 1. Material preparation: Choose appropriate filling materials and loosen them up to make them more fluffy so that they can better fill the gaps.
[0034] 2. Filling equipment preparation: Prepare a filling machine, which is usually provided with a hopper for placing the prepared filling material, and a corresponding conveying device capable of conveying the filling material to the position of the wire core 103 that needs to be filled.
[0035] 3. Filling operation: The wire core 103 with the insulating layer 104 is placed on the operating platform of the filling equipment, and then the filling machine is started. At this time, the started filling machine will convey the filling material from the hopper through the conveying device to the gaps between the wire cores 103 with the insulating layer 104, just like pouring, to fill the gaps.
[0036] The electromagnetic shielding layer 107 and the outer shielding layer 111 are both metal foils, and are generally wrapped: the semi-finished cable is placed on the operating platform of the wrapping machine, the wrapping machine is started, and the wrapping machine conveys the metal foil to the wrapping position through the feeding device, and then wraps it around the core 103 at a certain speed and tension.
[0037] The waterproof layer 108 is a polyethylene or asphalt composite material, which is generally operated by extrusion, and no further explanation is given here; The armor layer 109 is a steel wire or a steel belt, and is generally armored in the following manner: the semi-finished cable is placed on the operating platform of the steel belt armoring machine, and the armoring machine is started. At this time, the armoring machine that is started allows the steel belt or steel wire to be conveyed to the armoring position through the feeding device, and then armors around the wire core 103 at a certain speed and tension; The heat insulation layer 110 is ceramic fiber, which is generally operated by wrapping, and no further explanation is given here; The corrosion-resistant layer 112 is made of polyvinyl chloride, chloroprene rubber or fluoroplastic, and is generally produced by extrusion, which will not be explained in detail here. The wear-resistant layer 113 is made of polyurethane or rubber material, and is generally produced by extrusion, which will not be further explained here.
[0038] 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 protection scope of the present invention.
Claims
1. Long distance symmetrical cable, characterized by: Comprising a cable body (1), the cable body (1) comprising a tension-resistant rope (101) and a compression-resistant mechanism (106); The pressure-resistant mechanism (106) comprises a first pressure-resistant sleeve (1061), a corrugated pressure-resistant sleeve (1069) and an outer auxiliary sleeve (10612); a plurality of first arc-shaped holes (1062) are evenly spaced on one side of the first pressure-resistant sleeve (1061); an arc-shaped pressure-resistant shell (1064) is disposed inside each of the first arc-shaped holes (1062); an arc-shaped pressure-resistant strip (1063) is disposed inside each of the arc-shaped pressure-resistant shells (1064); a second pressure-resistant sleeve (1065) is disposed on the outer wall of the first pressure-resistant sleeve (1061); and a plurality of first arc-shaped holes (1062) are evenly spaced on one side of the first pressure-resistant sleeve (1061). A plurality of second arc-shaped holes (1066) are distributed and opened, each of the second arc-shaped hole covers (1066) is provided with a pressure-resistant part (1067) inside, an inner auxiliary sleeve (1068) is provided on the outer wall of the second pressure-resistant sleeve (1065), a plurality of first pressure-resistant toughness strips (10610) are provided between the inner auxiliary sleeve (1068) and the corrugated pressure-resistant sleeve (1069), a plurality of second pressure-resistant toughness strips (10611) are provided between the outer auxiliary sleeve (10612) and the corrugated pressure-resistant sleeve (1069), and a protective sleeve (10613) is provided on the outer wall of the outer auxiliary sleeve (10612).
2. The long-distance symmetrical cable according to claim 1, characterized in that: A plurality of the first compression-resistant tough strips (10610) and a plurality of the second compression-resistant tough strips (10611) are arranged in an alternating manner, and the outer surface of each of the first compression-resistant tough strips (10610) contacts the inner wall of the corrugated compression-resistant sleeve (1069), and the outer surface of each of the first compression-resistant tough strips (10610) contacts the inner wall of each groove of the inner auxiliary sleeve (1068).
3. The long-distance symmetrical cable according to claim 1, characterized in that: The outer surface of each of the second compression-resistant tough strips (10611) contacts the outer wall of the corrugated compression-resistant sleeve (1069), and the outer surface of the second compression-resistant tough strips (10611) contacts the inner wall of each groove of the outer auxiliary sleeve (10612).
4. The long-distance symmetrical cable according to claim 1, characterized in that: Each included angle inside each of the first arc-shaped holes (1062) is a curved surface, and each included angle inside each of the second arc-shaped holes (1066) is a curved surface.
5. The long-distance symmetrical cable according to claim 1, characterized in that: The outer surface of the tensile rope (101) is provided with a rope loop (102), and the outer surface of the rope loop (102) has four groups of wire cores (103) distributed at equal intervals.
6. The long-distance symmetrical cable according to claim 5, characterized in that: The number of the wire cores (103) in each group is two, and an insulating layer (104) is provided on the outer surface of each wire core (103). The eight insulating layers (104) are divided into four groups in total, and the insulating layers (104) in each group are twisted together.
7. The long-distance symmetrical cable according to claim 6, characterized in that: A filling layer (105) is provided between the outer walls of the plurality of insulating layers (104) and the outer wall of the rope sleeve (102), and the outer wall of the filling layer (105) is bonded to the inner wall of the first pressure-resistant sleeve (1061).
8. The long-distance symmetrical cable according to claim 1, characterized in that: The outer wall of the protective sleeve (10613) is provided with an electromagnetic shielding layer (107), and the outer wall of the electromagnetic shielding layer (107) is provided with a waterproof layer (108).
9. The long-distance symmetrical cable according to claim 8, characterized in that: The outer wall of the waterproof layer (108) is provided with an armor layer (109), and the outer wall of the steel wire armor layer (109) is provided with a heat insulation layer (110).
10. The long-distance symmetrical cable according to claim 9, characterized in that: The outer wall of the heat insulation layer (110) is provided with an outer shielding layer (111), the outer wall of the outer shielding layer (111) is provided with a corrosion-resistant layer (112), and the outer wall of the corrosion-resistant layer (112) is provided with a wear-resistant layer (113).