Low-temperature-resistant flexible tensile wear-resistant cable

Abstract

The utility model relates to a low-temperature-resistant flexible tensile wear-resistant cable, which comprises a cable core formed by twisting a plurality of power insulation wire cores around a central heating element, heating insulation wire cores and control wire core units arranged between the adjacent power insulation wire cores at intervals, fillers arranged in gaps in the cable core, and a semi-conductive belt wrapped outside the cable core, a heat preservation belt is wrapped outside a semi-conductive belt and symmetrically arranged heating insulation wire cores are wrapped outside the semi-conductive belt, a first layer of inner sheath is extruded outside the heat preservation belt, a first metal shielding layer is woven outside the first layer of inner sheath, a second layer of inner sheath is extruded outside the first metal shielding layer, a first insulation belt is wrapped outside the second layer of inner sheath, and a second layer of inner sheath is woven outside the second insulation belt. A metal heating layer is woven outside the first insulating tape, a second insulating tape is wrapped outside the metal heating layer, and an outer sheath is extruded outside the second insulating tape. According to the utility model, the power insulation wire cores, the control wire core units, the heating insulation wire cores and the central heating element are twisted to form the cable, and the cable sheath is divided into three layers, so that the internal stress when the cable is bent is reduced, and the cable is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a cable for mobile use in a low-temperature environment. Background Technique

[0002] For a mobile cable used in a low-temperature environment, there are two states. One is when the cable is not operating, the cable is static, and each structure of the cable is at the same temperature as the environment. The other is when the cable is operating, after being energized, the conductor generates heat, the internal temperature of the cable is higher than the ambient temperature, and the cable moves or bends during use.

[0003] The cable structure withstands the lowest temperature when static. When operating, the internal temperature of the cable is higher than the external ambient temperature, but it is still in a low-temperature environment. Especially for the outer sheath, it is basically at the same temperature as the environment. It is necessary to protect the cable structure from being damaged by the force during movement or bending. Content of the Utility Model

[0004] Object of the Invention: The object of the utility model is to overcome the deficiencies in the prior art and provide a low-temperature resistant, flexible, tensile and wear-resistant cable in which a power insulated conductor core, a control conductor core unit, a heating insulated conductor core and a central heating element are stranded into a cable. The cable sheath is divided into three layers to reduce the internal stress when the cable bends and prevent damage.

[0005] Technical Solution: To solve the above technical problems, a low-temperature resistant, flexible, tensile and wear-resistant cable according to the utility model comprises a power conductor core. A power insulated conductor core is formed by extruding a power conductor core insulation layer outside the power conductor core. A heating insulated conductor core is formed by extruding a heating insulation layer outside a heating conductor. A plurality of power insulated conductor cores are stranded around a central heating element to form a cable core. Heating insulated conductor cores and control conductor core units are arranged at intervals between adjacent power insulated conductor cores. A filling is arranged in the internal gap of the cable core. A semi-conductive tape is wound outside the cable core. A heat-insulating tape is wound outside the semi-conductive tape and a symmetrically placed heating insulated conductor core is covered. A first inner sheath is extruded outside the heat-insulating tape. A first metal shielding layer is braided outside the first inner sheath. A second inner sheath is extruded outside the first metal shielding layer. A first insulating tape is wound outside the second inner sheath. A metal heating layer is braided outside the first insulating tape. A second insulating tape is wound outside the metal heating layer. An outer sheath is extruded outside the second insulating tape;

[0006] The central heating element comprises a first conductor. A first insulating layer is wound outside the first conductor. A second conductor is stranded outside the first insulating layer. A second insulating layer is extruded outside the second conductor. A metal strengthening layer is braided outside the second insulating layer. A first protective layer is extruded outside the metal strengthening layer;

[0007] The control conductor core unit comprises a conductor. A control insulated conductor core is formed by extruding a third insulating layer outside the conductor. A plurality of control insulated conductor cores are stranded to form a control unit cable core. A second metal shielding layer is braided outside the control unit cable core. A second protective layer is extruded outside the second metal shielding layer.

[0008] Furthermore, the first conductor is a nickel-plated copper conductor with a cross-section of 2.5 - 10 mm 2 , and it adopts a stranded structure with a single wire diameter not exceeding 0.5 mm;

[0009] The first insulating layer is formed by overlapping and winding two layers of polytetrafluoroethylene tapes, and the single-layer thickness is not less than 0.2 mm;

[0010] The second conductor is stranded outside the first insulating layer to form a concentric structure with the first conductor. It uses a copper conductor with a single wire diameter not exceeding 0.8 mm;

[0011] The second insulating layer uses silicone rubber with a thickness not less than 0.8 mm;

[0012] The metal strengthening layer is made of galvanized steel wires woven. The number of weaving spindles is 16 - 24, the single wire diameter is not greater than 0.3 mm, and the weaving density is greater than 85%;

[0013] The first protective layer uses a thermoplastic elastomer insulating grade sheath with a thickness not less than 0.8 mm.

[0014] Furthermore, the conductor of the power core uses tinned copper wires for multiple stranding. The single wire diameter is not greater than 0.3 mm, the number of strands in the strand bundle is not more than 12, forming a multi-strand stranded structure. The pitch diameter ratio of the strand bundle is not greater than 15 times, and the pitch diameter ratio of the multiple stranding is not greater than 12 times;

[0015] The insulating layer of the power core uses thermoplastic polyolefin vulcanized rubber with a thickness not less than 0.8 mm.

[0016] Furthermore, the conductor uses a tinned copper conductor with a single wire diameter not exceeding 0.3 mm and a nominal cross-sectional area of the conductor not exceeding 6 mm 2 , and it adopts a bunch-stranded or multi-stranded structure with the outermost pitch diameter ratio not greater than 15 times;

[0017] The third insulating layer uses thermoplastic polyolefin vulcanized rubber with a thickness not less than 0.7 mm;

[0018] The second metal shielding layer is made of copper wires woven. The single wire diameter is less than 0.15 mm, and the weaving density is greater than 80%;

[0019] The second protective layer uses a thermoplastic elastomer insulating grade sheath with a thickness not less than 0.6 mm.

[0020] Furthermore, the heating conductor uses a copper conductor with a single wire diameter not exceeding 0.3 mm and a nominal cross-sectional area of the conductor not exceeding 4 mm 2 ,

[0021] The heating insulating layer uses silicone rubber with a thickness not less than 0.6 mm.

[0022] Further, the semiconductive tape is formed by overlapping and winding a semiconductive cotton tape, with a thickness of not less than 0.15 mm and an overlapping rate of more than 30%.

[0023] Further, the heat-insulating tape is formed by overlapping and winding two layers of cotton tape, with a thickness of not less than 0.3 mm and an overlapping rate of more than 30%. 4-6 heating insulated wire cores are symmetrically placed inside the heat-insulating tape.

[0024] Further, both the first inner sheath and the second inner sheath are made of styrene thermoplastic elastomer, with a thickness of 0.6-0.8 mm;

[0025] The outer sheath is made of polyester thermoplastic elastomer, with a thickness of 0.8-1.0 mm.

[0026] Further, the first metal shielding layer is formed by copper wire braiding, with a single wire diameter of not more than 0.15 mm and a braiding density of not less than 80%;

[0027] The metal heating layer is formed by copper alloy braiding, with a single wire diameter of not more than 0.3 mm and a braiding density of 60-70%.

[0028] Further, the first insulating tape and the second insulating tape are formed by overlapping and winding polytetrafluoroethylene tape.

[0029] Beneficial effects: Compared with the prior art, the remarkable advantages of the present utility model are as follows: A central heating element is arranged in the center of the cable, and nickel-plated copper is used as the first central conductor. The nickel-plated copper conductor has a high temperature resistance grade, a large resistance, and a large amount of heat generation. During the operation of the cable, it becomes a heat source from the center, improving the overall temperature of the cable and making the cable flexible. A polytetrafluoroethylene insulating tape is wound around the nickel-plated copper first conductor, the stranded copper second conductor is twisted, silicone rubber insulation is extruded, galvanized steel wire is braided, and a thermoplastic elastomer insulating layer is extruded. The temperature gradually decreases from the center to the periphery, which not only ensures that the heat heats the cable structure but also does not cause aging and damage to other structures due to the high temperature on the outer surface of the central heating element.

[0030] A control wire core unit is provided to transmit control, measurement signals, etc., and the temperature inside the cable can be monitored in real time.

[0031] Heating insulated wire cores are arranged between the power insulated wire cores and symmetrically and uniformly distributed outside the cable core, increasing the heat in the middle of the cable structure and improving the bending flexibility of the cable.

[0032] The sheath is divided into three layers, each with a small thickness. When the cable is bent, the stress inside the sheath is reduced, and the flexibility is good.

[0033] A metal heating layer is arranged between the second inner sheath and the outer sheath, surrounding the entire circumference to heat the sheath, improving the sheath temperature, protecting the sheath from low-temperature damage, and improving the flexibility of the cable.

[0034] In the three-layer sheath, the first two inner sheaths are made of styrene thermoplastic elastomer, which is resistant to low and high temperatures and is soft in a rubber state; the outer sheath is made of polyester thermoplastic elastomer, which is resistant to low and high temperatures, flexible, has good weather resistance, and good abrasion resistance. The cable can protect the cable both statically and during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 is a schematic diagram of the structure of the central heating element in the present invention;

[0037] Figure 3 is a schematic diagram of the structure of the control wire core unit in the present invention;

[0038] Figure 4 is a schematic diagram of the structure of the power wire core conductor in the present invention Figure 1 ;

[0039] Figure 5 is a schematic diagram of the structure of the power wire core conductor in the present invention Figure 2 . DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The present invention will be further described below with reference to the drawings and embodiments. Embodiment 1

[0041] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, for a low-temperature flexible, tensile and wear-resistant cable according to the present invention, an outer extrusion of a power wire core insulation layer 6 on the power wire core conductor 5 forms a power insulated wire core, an outer extrusion of a heating insulation layer 3 on the heating conductor 2 forms a heating insulated wire core, multiple power insulated wire cores are stranded around the central heating element 1 to form a cable core, a heating insulated wire core and a control wire core unit 7 are arranged at intervals between adjacent power insulated wire cores, a filler 4 is arranged in the internal gap of the cable core, a semi-conductive tape 8 is wound around the cable core, a heat-insulating tape 9 is wrapped and the symmetrically placed heating insulated wire cores are covered, a first inner sheath 10 is extruded, a first metal shielding layer 11 is braided, a second inner sheath 12 is extruded, a first insulating tape 13 is wrapped, a metal heating layer 14 is braided, a second insulating tape 15 is wrapped, and an outer sheath 16 is extruded.

[0042] The central heating element 1 is composed of a first conductor 1-1 with an outer wrapped first insulating layer 1-2, a second conductor 1-3 is stranded, a second insulating layer 1-4 is extruded, a metal strengthening layer 1-5 is braided, and a first protective layer 1-6 is extruded.

[0043] The control core unit 7 is formed by extruding a third insulating layer 7-2 outside the conductor 7-1 to form a control insulated core. The control insulated cores are stranded to form a control unit core, a second metal shielding layer 7-3 is braided, and a second sheath 7-4 is extruded.

[0044] The first conductor 1-1 is a nickel-plated copper conductor with a cross-section of 2.5 - 10 mm 2 , and it adopts a stranded structure with a single wire diameter not greater than 0.5 mm. The nickel-plated copper conductor has a high temperature resistance grade, a large resistance, and a large amount of heat generation. During the operation of the cable, it becomes a heat source from the center, increasing the overall temperature of the cable and making the cable flexible.

[0045] The first insulating layer 1-2 is wrapped by overlapping two layers of polytetrafluoroethylene tapes, and the single-layer thickness is not less than 0.2 mm. Polytetrafluoroethylene is resistant to low and high temperatures. When the cable is not operating, the temperature is low and the insulating layer will not be damaged. When the cable is operating, the first conductor 1-1 can reach 250 °C, with a high amount of heat, heating the whole cable to ensure that the cable is flexible and not damaged during movement and bending.

[0046] The second conductor 1-3 is stranded outside the first insulating layer 1-2, forming a concentric structure with the first conductor 1-1. It adopts a copper conductor with a single wire diameter of the copper conductor not greater than 0.8 mm. There is a gap allowed between the single wires of the second conductor 1-3. The operating temperature of the second conductor 1-3 can reach 180 °C, gradually heating the cable from the inside to the outside.

[0047] The second insulating layer 1-4 uses silicone rubber, which is resistant to low and high temperatures, soft, and has a thickness not less than 0.8 mm.

[0048] The metal strengthening layer 1-5 is braided with galvanized steel wires, which plays a stress-bearing role during the movement and bending of the cable. The number of braiding spindles is 16 - 24 spindles, the single wire diameter is not greater than 0.3 mm, and the braiding density is greater than 85%.

[0049] The first sheath 1-6 uses a thermoplastic elastomer insulation-grade sheath material with a thickness not less than 0.8 mm, which protects the central heating element 1 and enhances insulation safety.

[0050] The power core conductor 5 is formed by multiple-strand stranding of tinned copper wires, with a single wire diameter not greater than 0.3 mm and the number of strand wires in the strand bundle not more than 12, forming a multi-strand stranded structure. The fewer the number of strand wires in the strand bundle, the more the number of strands, the more the number of layers during multi-strand stranding, and the softer the stranded wire. The cross-section of the conductor is 6 mm 2 , and the multi-strand stranded structure is 19 / 10 / 0.2 mm, and the number of multi-strand stranding layers is 2 layers except for the center. The direction of the strand wires in the strand bundle is the same as the multi-strand stranding direction, and there is no reverse internal stress during bending, making it softer. The pitch diameter ratio of the strand wires in the strand bundle is not greater than 15 times, and the multi-strand stranding pitch diameter ratio is not greater than 12 times.

[0051] The insulation layer 6 of the power core is made of thermoplastic polyolefin vulcanized rubber, which is prepared by blending ethylene-propylene rubber and polypropylene. It has excellent electrical insulation performance, heat resistance and cold resistance. The thickness of the insulation layer 6 of the power core is not less than 0.8 mm and increases with the increase of the nominal cross-sectional area of the conductor.

[0052] The conductor 7-1 is a tinned copper conductor with a single wire diameter not greater than 0.3 mm and a nominal cross-sectional area of the conductor not greater than 6 mm 2 , and it adopts a bunch-stranded or composite-stranded structure with an outer layer pitch diameter ratio not greater than 15 times.

[0053] The third insulation layer 7-2 is made of thermoplastic polyolefin vulcanized rubber, which is prepared by blending ethylene-propylene rubber and polypropylene. It has excellent electrical insulation performance, heat resistance and cold resistance. The thickness of the third insulation layer 7-2 is not less than 0.7 mm.

[0054] The second metal shielding layer 7-3 is made of copper wire braiding with a single wire diameter less than 0.15 mm and a braiding density greater than 80%, which plays a shielding function.

[0055] The second sheath 7-4 is made of a thermoplastic elastomer insulating sheath with a thickness not less than 0.6 mm, which controls the control core unit 7 and enhances insulation safety.

[0056] The heating conductor 2 is a copper conductor with a single wire diameter not greater than 0.3 mm and a nominal cross-sectional area of the conductor not greater than 4 mm 2 。

[0057] The heating insulation layer 3 is made of silicone rubber with a thickness not less than 0.6 mm.

[0058] Multiple power insulated cores are stranded around the central heating element 1 to form a cable core. Heating insulated cores and control core units 7 are arranged at intervals between adjacent power insulated cores. A filling 4 is provided in the internal gap of the cable core. The filling 4 is a rubber strip. The pitch diameter ratio of the cable core stranding is not greater than 25 times.

[0059] The semi-conductive tape 8 is a semi-conductive cotton tape with a thickness not less than 0.15 mm, which is overlapped and wrapped with an overlap rate greater than 30% to play a shielding role.

[0060] The heat-insulating tape 9 is made of two layers of cotton tapes with a thickness not less than 0.3 mm, which are overlapped and wrapped with an overlap rate greater than 30% for heat insulation and buffering the force. Four heating insulated cores are symmetrically placed inside the heat-insulating tape 9.

[0061] The first inner sheath 10 and the second inner sheath 12 are made of styrene thermoplastic elastomer, which are resistant to low and high temperatures, soft in rubber state, and their thicknesses are both 0.6 - 0.8 mm.

[0062] The first metal shielding layer 11 is made of copper wire braiding with a single wire diameter not greater than 0.15 mm and a braiding density not less than 80% to play a shielding role.

[0063] The metal heating layer 14 is made of copper alloy braiding. The diameter of a single wire is not more than 0.3 mm, and the braiding density is 60 - 70%. When the cable is in operation, current passes through it, heating the second inner sheath 12 and the outer sheath 16, thereby improving the flexibility of the cable.

[0064] The first insulating tape 13 and the second insulating tape 15 are made of polytetrafluoroethylene tape and are overlapped and wrapped to insulate the current inside the metal heating layer 14, ensuring insulation safety.

[0065] The outer sheath 16 is made of polyester thermoplastic elastomer, which is resistant to low and high temperatures, flexible, has good weather resistance and wear resistance, and its thickness is 0.8 - 1.0 mm. The sheath is divided into three layers, each with a small thickness. When the cable is bent, the internal stress in the sheath is reduced, and the flexibility is good. Embodiment 2

[0066] As Figure 1 、 Figure 2 、 Figure 3 and Figure 5 shown, for a low-temperature resistant, flexible, tensile and wear-resistant cable of the present utility model, an insulating layer 6 is extruded outside the power core conductor 5 to form a power insulated core, and an insulating layer 3 is extruded outside the heating conductor 2 to form a heating insulated core. Multiple power insulated cores are stranded around the central heating element 1 to form a cable core. Heating insulated cores and control core units 7 are arranged at intervals between adjacent power insulated cores. A filling 4 is provided in the internal gap of the cable core. A semi-conductive tape 8 is wound around the cable core, a heat-insulating tape 9 is wound, and symmetrically placed heating insulated cores are covered. A first inner sheath 10 is extruded, a first metal shielding layer 11 is braided, a second inner sheath 12 is extruded, a first insulating tape 13 is wound, a metal heating layer 14 is braided, a second insulating tape 15 is wound, and an outer sheath 16 is extruded.

[0067] The central heating element 1 is composed of a first conductor 1-1 with a first insulating layer 1-2 wound around it, a second conductor 1-3 stranded, a second insulating layer 1-4 extruded, a metal strengthening layer 1-5 braided, and a first protective layer 1-6 extruded.

[0068] The control core unit 7 is composed of a conductor 7-1 with a third insulating layer 7-2 extruded outside it to form a control insulated core, the control insulated cores are stranded to form a control unit cable core, a second metal shielding layer 7-3 is braided, and a second protective layer 7-4 is extruded.

[0069] The first conductor 1-1 is a nickel-plated copper conductor with a cross-section of 2.5 - 10 mm 2 , and it adopts a stranded structure with the diameter of a single wire not more than 0.5 mm. The nickel-plated copper conductor has a high temperature resistance grade, a large resistance, and a large heat generation amount. During the operation of the cable, it becomes a heat source from the center, increasing the overall temperature of the cable and making the cable flexible.

[0070] The first insulating layer 1-2 is formed by overlapping and winding two layers of polytetrafluoroethylene tapes, and the thickness of a single layer is not less than 0.2 mm. Polytetrafluoroethylene is resistant to low and high temperatures. When the cable is not operating, the temperature is low and the insulating layer will not be damaged. When the cable is operating, the first conductor 1-1 can reach 250 °C. With high heat, it heats the whole cable to ensure that the cable is flexible and not damaged during movement and bending.

[0071] The second conductor 1-3 is stranded outside the first insulating layer 1-2 to form a concentric structure with the first conductor 1-1. A copper conductor is used, and the diameter of a single copper conductor is not more than 0.8 mm. There is a gap allowed between single strands of the second conductor 1-3. The operating temperature of the second conductor 1-3 can reach 180 °C, and it heats the cable gradually from the inside to the outside.

[0072] The second insulating layer 1-4 is made of silicone rubber, which is resistant to low and high temperatures and is flexible. The thickness is not less than 0.8 mm.

[0073] The metal reinforcement layer 1-5 is made by braiding galvanized steel wires, which plays a stress-bearing role during the movement and bending of the cable. The number of braiding spindles is 16 - 24, the diameter of a single wire is not more than 0.3 mm, and the braiding density is greater than 85%.

[0074] The first sheath 1-6 is made of a thermoplastic elastomer insulating grade sheath material, with a thickness not less than 0.8 mm, which protects the central heating element 1 and enhances insulation safety.

[0075] The conductor of the power core 5 is made by multiple-strand stranding of tinned copper wires. The diameter of a single wire is not more than 0.3 mm, and the number of wires in a strand bundle is not more than 12, forming a multi-strand stranded structure. The fewer the number of wires in a strand bundle, the more the number of strands, the more the number of layers during multiple-strand stranding, and the softer the stranded wire. The cross-sectional area of the conductor is 50 mm 2 , and the multi-strand stranded structure is 60 / 12 / 0.3 mm. The number of multiple-strand stranding layers is 4 layers except for the center. The direction of the wires in the strand bundle is the same as the direction of multiple-strand stranding, and there is no reverse internal stress during bending, making it softer. The pitch diameter ratio of the wires in the strand bundle is not more than 15 times, and the pitch diameter ratio of multiple-strand stranding is not more than 12 times.

[0076] The insulating layer 6 of the power core is made of thermoplastic polyolefin vulcanized rubber, which is prepared by blending ethylene-propylene rubber and polypropylene. It has excellent electrical insulation performance, heat resistance, and cold resistance. The thickness of the insulating layer 6 of the power core is not less than 0.8 mm and increases with the increase of the nominal cross-sectional area of the conductor.

[0077] The conductor 7-1 is made of a tinned copper conductor. The diameter of a single wire is not more than 0.3 mm, and the nominal cross-sectional area of the conductor is not more than 6 mm 2 , and it adopts a stranded wire or multi-strand stranding structure, and the pitch diameter ratio of the outermost layer is not more than 15 times.

[0078] The third insulating layer 7-2 is made of thermoplastic polyolefin vulcanized rubber, which is prepared by blending ethylene-propylene rubber and polypropylene. It has excellent electrical insulation performance, heat resistance, and cold resistance. The thickness of the third insulating layer 7-2 is not less than 0.7 mm.

[0079] The second metal shielding layer 7-3 is made of copper wire braiding. The single wire diameter is less than 0.15 mm, and the braiding density is greater than 80%, which plays a shielding function.

[0080] The second sheath 7-4 uses a thermoplastic elastomer insulating sheath with a thickness of not less than 0.6 mm, controls the core unit 7, and enhances insulation safety.

[0081] The heating conductor 2 uses a copper conductor with a single wire diameter of not more than 0.3 mm and a nominal cross-sectional area of the conductor of not more than 4 mm 2 。

[0082] The heating insulation layer 3 uses silicone rubber with a thickness of not less than 0.6 mm.

[0083] Multiple power insulated cores are stranded around the central heating element 1 to form a core. Heating insulation cores and control core units 7 are arranged at intervals between adjacent power insulated cores. A filling 4 is provided in the internal gap of the core. The filling 4 uses a rubber strip. The stranding pitch diameter ratio of the core is not more than 25 times.

[0084] The semi-conductive tape 8 uses a semi-conductive cotton tape with a thickness of not less than 0.15 mm, which is overlapped and wrapped with an overlap rate greater than 30% to play a shielding role.

[0085] The heat preservation tape 9 uses two layers of cotton tapes with a thickness of not less than 0.3 mm, which are overlapped and wrapped with an overlap rate greater than 30% for heat preservation and buffering force. Four heating insulation cores are symmetrically placed inside the heat preservation tape 9.

[0086] The first inner sheath 10 and the second inner sheath 12 use styrene thermoplastic elastomer, which is resistant to low and high temperatures, soft in a rubber state, and their thicknesses are both 0.6 - 0.8 mm.

[0087] The first metal shielding layer 11 is made of copper wire braiding with a single wire diameter of not more than 0.15 mm and a braiding density of not less than 80% to play a shielding role.

[0088] The metal heating layer 14 is made of copper alloy braiding with a single wire diameter of not more than 0.3 mm and a braiding density of 60 - 70%. When the cable is operating, current passes through it to heat the second inner sheath 12 and the outer sheath 16, improving the flexibility of the cable.

[0089] The first insulating tape 13 and the second insulating tape 15 use polytetrafluoroethylene tapes, which are overlapped and wrapped to insulate the current inside the metal heating layer 14 and ensure insulation safety.

[0090] The outer sheath 16 uses a polyester thermoplastic elastomer, which is resistant to low and high temperatures, flexible, has good weather resistance and wear resistance, and its thickness is 0.8 - 1.0 mm. The sheath is divided into three layers with a small thickness for each layer. When the cable is bent, the stress inside the sheath is reduced and the flexibility is good.

[0091] The present utility model provides an idea and a method. There are many ways and means to specifically implement this technical solution. The above description is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. Each component not clearly defined in this embodiment can be implemented by using the existing technology.

Claims

1. A low temperature resistant flexible tensile wear resistant cable, characterized by: The invention comprises a power core conductor (5), a power core insulation layer (6) is extruded outside the power core conductor (5) to form a power insulation core, a heating insulation layer (3) is extruded outside the heating conductor (2) to form a heating insulation core, a plurality of power insulation cores are twisted around a central heating element (1) to form a cable core, heating insulation cores and control core units (7) are arranged between adjacent power insulation cores, a filler (4) is arranged in the internal gap of the cable core, a semi-conductive tape (8) is wrapped around the cable core, a thermal insulation tape (9) is wrapped around the semi-conductive tape (8) and coated A symmetrically placed heating insulation core, a first inner sheath (10) is extruded outside the insulation tape (9), a first metal shielding layer (11) is braided outside the first inner sheath (10), a second inner sheath (12) is extruded outside the first metal shielding layer (11), a first insulation tape (13) is wrapped around the second inner sheath (12), a metal heating layer (14) is braided outside the first insulation tape (13), a second insulation tape (15) is wrapped around the metal heating layer (14), and an outer sheath (16) is extruded outside the second insulation tape (15); The central heating element (1) comprises a first conductor (1-1), a first insulating layer (1-2) is wrapped around the first conductor (1-1), a second conductor (1-3) is twisted outside the first insulating layer (1-2), a second insulating layer (1-4) is extruded outside the second conductor (1-3), a metal reinforcement layer (1-5) is braided outside the second insulating layer (1-4), and a first protective layer (1-6) is extruded outside the metal reinforcement layer (1-5); The control wire core unit (7) comprises a conductor (7-1), a third insulating layer (7-2) is extruded outside the conductor (7-1) to form a control insulation wire core, a plurality of control insulation wire cores are twisted together to form a control unit cable core, a second metal shielding layer (7-3) is braided outside the control unit cable core, and a second protective layer (7-4) is extruded outside the second metal shielding layer (7-3).

2. The low temperature resistant flexible tensile wear resistant cable according to claim 1, characterized in that: The first conductor (1-1) is a nickel-plated copper conductor with a cross-section of 2.5-10mm 2 , adopts twisted structure, single wire diameter is not more than 0.5mm; The first insulating layer (1-2) is formed by overlapping and wrapping two layers of polytetrafluoroethylene tape, and the thickness of a single layer is not less than 0.2 mm; The second conductor (1-3) is twisted outside the first insulating layer (1-2) to form a concentric structure with the first conductor (1-1), and is made of copper conductor, with a single copper conductor having a diameter of no more than 0.8 mm; The second insulating layer (1-4) is made of silicone rubber with a thickness of not less than 0.8 mm; The metal reinforcement layer (1-5) is woven from galvanized steel wires, the number of weaving spindles is 16-24, the diameter of the single wire is not greater than 0.3 mm, and the weaving density is greater than 85%; The first protective layer (1-6) adopts a thermoplastic elastomer insulation grade sheath with a thickness of not less than 0.8mm.

3. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The power line core conductor (5) is made of tinned copper wires twisted together, the diameter of the single wire is not greater than 0.3 mm, the number of strands is not more than 12, forming a multi-strand twisted structure, the strand diameter ratio is not greater than 15 times, and the twisted wire diameter ratio is not greater than 12 times; The power line core insulation layer (6) is made of thermoplastic polyolefin vulcanized rubber with a thickness of not less than 0.8 mm.

4. The low temperature resistant flexible tensile wear resistant cable according to claim 1, characterized in that: The conductor (7-1) is made of tinned copper conductor, the diameter of the single wire is not more than 0.3mm, and the nominal cross-sectional area of ​​the conductor is not more than 6mm 2 , using bundled wire or double-twisted structure, the outermost layer pitch diameter ratio is not more than 15 times; The third insulating layer (7-2) is made of thermoplastic polyolefin vulcanized rubber with a thickness of not less than 0.7 mm; The second metal shielding layer (7-3) is woven from copper wires, with a single wire diameter of less than 0.15 mm and a weaving density greater than 80%; The second protective layer (7-4) adopts a thermoplastic elastomer insulation grade sheath with a thickness of not less than 0.6mm.

5. The low temperature resistant flexible tensile wear resistant cable according to claim 1, characterized in that: The heating conductor (2) shall be a copper conductor with a single wire diameter of no more than 0.3 mm and a conductor nominal cross-sectional area of ​​no more than 4 mm. 2 , The heating insulation layer (3) is made of silicone rubber and has a thickness of not less than 0.6 mm.

6. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The semi-conductive tape (8) is formed by overlapping and wrapping semi-conductive cotton tapes, has a thickness of not less than 0.15 mm, and an overlap rate of more than 30%.

7. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The thermal insulation belt (9) is formed by overlapping and wrapping two layers of cotton cloth belts, with a thickness of not less than 0.3 mm and an overlap rate of more than 30%. 4 to 6 heating insulated wire cores are symmetrically placed in the thermal insulation belt (9).

8. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The first inner sheath (10) and the second inner sheath (12) are both made of styrene thermoplastic elastomer and have a thickness of 0.6-0.8 mm; The outer sheath (16) is made of polyester thermoplastic elastomer and has a thickness of 0.8-1.0 mm.

9. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The first metal shielding layer (11) is woven from copper wires, the diameter of a single wire is not greater than 0.15 mm, and the weaving density is not less than 80%; The metal heating layer (14) is woven from a copper alloy, the diameter of a single wire is no greater than 0.3 mm, and the weaving density is 60-70%.

10. The low temperature resistant flexible tensile and wear resistant cable according to claim 1, characterized in that: The first insulating tape (13) and the second insulating tape (15) are formed by overlapping and wrapping polytetrafluoroethylene tapes.

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