CN220491624U - Cable for shield machine - Google Patents
Cable for shield machine Download PDFInfo
- Publication number
- CN220491624U CN220491624U CN202321472745.9U CN202321472745U CN220491624U CN 220491624 U CN220491624 U CN 220491624U CN 202321472745 U CN202321472745 U CN 202321472745U CN 220491624 U CN220491624 U CN 220491624U
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- layer
- cable
- shielding layer
- power wire
- conductor
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- 239000010410 layer Substances 0.000 claims abstract description 97
- 239000004020 conductor Substances 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003063 flame retardant Substances 0.000 claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 15
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 6
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 23
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 239000010949 copper Substances 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 17
- 239000004677 Nylon Substances 0.000 claims description 15
- 229920001778 nylon Polymers 0.000 claims description 15
- 230000005641 tunneling Effects 0.000 claims description 8
- 238000009941 weaving Methods 0.000 claims description 6
- 229920000271 Kevlar® Polymers 0.000 claims description 3
- 239000004761 kevlar Substances 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 abstract description 8
- 150000002367 halogens Chemical class 0.000 abstract description 8
- 230000035882 stress Effects 0.000 description 14
- 239000000203 mixture Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000009954 braiding Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000004709 Chlorinated polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- Insulated Conductors (AREA)
Abstract
The utility model discloses a cable for a shield machine, which comprises a power wire core, a filling reinforcement and an outer protective layer, wherein the power wire core extends longitudinally; on the vertical longitudinal cross section, the power wire core comprises a conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are sequentially arranged from inside to outside, and the outer protective layer comprises a wrapping layer, an inner protective sleeve, a reinforcing layer and an outer protective sleeve which are coaxially and sequentially arranged from inside to outside; the outer sheath is made of a thermosetting low-smoke halogen-free flame-retardant ethylene-vinyl acetate material. The cable for the shield machine can meet the requirements of low smoke, zero halogen and flame retardance, and can be more suitable for the severe working environment of shield machine equipment.
Description
Technical Field
The utility model relates to the technical field of wires and cables, in particular to a cable for a shield machine.
Background
With the continuous expansion of the construction scale of tunnels, mines and shaft engineering in China and the continuous improvement of difficulty, the domestic tunnel shield tunneling equipment has realized the transition from none to all and from all to strong, even reaches the international leading level in recent years, and starts to export all over the world. The cable for the shield machine is also rapidly developed and advanced as a matched power facility of the equipment.
The shield machine belongs to mobile electrical equipment, when a fire accident happens to the surrounding environment, the cable for the shield machine is required to have extremely small release amount of halogen acid gas, so that the cable can not corrode complete equipment and other components, secondary disasters during combustion can be effectively reduced, harmful smoke generated during combustion is also relatively small, the effective implementation of measures such as evacuation, rescue and the like of related personnel in an emergency state is facilitated, the casualty probability of a tunnel project in a closed environment is reduced, and meanwhile, the cable for the shield machine needs to meet the performance requirements of softness, tensile resistance, oil resistance and the like of the cable for the shield machine, and is one of the development trends of the cable for the shield machine in future.
The cable insulating material for the shield machine generally uses ethylene propylene rubber mixture, and the insulating material can meet the requirements of insulation and no halogen, but the insulating material generally has a common flame retardant effect and cannot meet the requirement of low smoke for ensuring the electrical insulating performance. Therefore, in order to realize low-smoke halogen-free flame retardance of the cable, the key point is that the sheath layer is mainly made of chlorinated polyethylene, chloroprene rubber or polyurethane mixture, but the mixture cannot meet the low-smoke halogen-free flame retardance requirement at the same time.
Disclosure of Invention
The utility model aims to provide a cable for a shield machine, which can meet the requirements of low smoke, zero halogen and flame retardance.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a shield constructs machine cable which structural feature is: the cable comprises a power cable core, a filling reinforcement and an outer protective layer, wherein the power cable core extends longitudinally, the filling reinforcement is arranged in the outer protective layer, and the filling reinforcement is arranged in a gap between the power cable core and the outer protective layer; on the vertical longitudinal cross section, the power wire core comprises a conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are sequentially arranged from inside to outside, and the outer protective layer comprises a wrapping layer, an inner protective sleeve, a reinforcing layer and an outer protective sleeve which are coaxially and sequentially arranged from inside to outside; the outer sheath is made of a thermosetting low-smoke halogen-free flame-retardant ethylene-vinyl acetate material.
The 5 th tinned copper conductor can be adopted as the conductor, and is formed by a plurality of copper monofilaments through wiredrawing, wire bundling and twisting, wherein the twisting direction of Shu Si twisting is the same direction, and the flexibility of the power wire core can be effectively ensured. The wrapping layer can be arranged on the power wire core and the filling reinforcement in a overlapped wrapping mode, compared with the wrapping layer arranged between the inner sheath and the outer sheath, the wrapping structure enables the cable to be more compact, the wire core is prevented from loosening when the inner sheath is extruded, the roundness of the cable is guaranteed, the outer diameter of the cable is reduced, the material cost of the cable caused by non-roundness is reduced, and in addition, the wrapping layer also has the effects of uniform internal electric field and reduced transition resistance. The outer sheath adopts a thermosetting low-smoke halogen-free flame-retardant ethylene-vinyl acetate (EVM) elastomer mixture which is a commercial product, and the material has the flame retardant property of high oxygen index, contains no halogen in components, and meets the requirements of low-smoke halogen-free flame retardance. The vinyl acetate monomer content in the mixture is higher, so that the copolymer performance is more similar to that of rubber, the copolymer has better performances of elongation at break, ageing resistance, oil resistance, high and low temperature cracking resistance and the like, and the excellent performance can be more suitable for the harsh working environment of shield tunneling machine equipment.
Preferably, a first semi-conductive nylon tape layer is arranged between the conductor and the conductor shielding layer, and a second semi-conductive nylon tape layer is arranged between the insulating shielding layer and the metal shielding layer. The first semi-conductive nylon strap layer can be used for binding the conductor and conducting the conductor and shielding the conductor, and preventing copper wires in the conductor from accidentally damaging the conductor shielding; the second semi-conductive nylon strap layer can prevent the braided copper wires in the metal shielding layer from being embedded into and damaging the insulating shielding layer, so that the thickness of the insulating shielding layer is more uniform, and partial discharge is avoided between the conductor or the metal shielding layer and the insulating layer.
Preferably, the power wire cores are three and are circumscribed in pairs, and the filling reinforcement is arranged in gaps among the three power wire cores and between the power wire cores and the outer protective layer. The cable has the advantages that the whole structure is uniform and symmetrical, the stress borne by the cable can be dispersed to the filling reinforcing piece and each power wire core when the cable is stressed, the stress concentration phenomenon is eliminated, the risk of cable core breakage is reduced, and the cable has longer service life.
Preferably, the metal shielding layer is formed by weaving tin-plated copper wires and fiber wires, the weaving directions of the tin-plated copper wires and the fiber wires are opposite, the number of ingots of the tin-plated copper wires and the fiber wires is the same, and the coverage rate of the tin-plated copper wires is more than or equal to 80%. In the processing aspect, the weaving mode of the metal shielding layer enables the layer structure to contain two materials of tinned copper wires and fiber wires, so that working procedure time is saved, the outer diameter of the cable is reduced, and cost is reduced. In terms of performance, the higher tin-plated copper wire coverage rate in the metal shielding layer not only can well shield an electric field, but also can play a certain role in grounding protection, so that the metal shielding layer can be used as a ground wire without an additional ground wire core; the high-coverage braided layer can absorb more heat, so that the inner flammable insulating and shielding materials are more difficult to burn, and the flame-retardant effect of the cable is improved to a certain extent; the single tensile strength of the fiber yarn is far higher than that of the tinned copper yarn, and the fiber yarn is introduced into the metal shielding layer, so that the power wire core can bear more stress in the axial direction, and the tensile strength of the cable is improved.
Preferably, the inner sheath is made of an ethylene propylene rubber mixture, and a flame retardant is added into the ethylene propylene rubber mixture. Different from the insulating layer of the power wire core, the inner sheath has lower requirement on electrical insulation performance, so the ethylene propylene rubber mixture of the part increases the proportion of the flame retardant, can improve the flame retardant performance of the cable, and is a commercial product.
Preferably, the reinforcing layer is formed by adopting Kevlar fiber two-way braiding, and the braiding density is not less than 60%. The reinforcing layer is arranged, so that the cable can bear larger bending and stretching stress in a moving state, the wire core in the cable core is subjected to smaller stress concentration, and the normal operation of the cable is protected.
Compared with the prior art, the utility model has the following beneficial effects:
1. the cable for the shield machine is made of the thermosetting sheath material, meets the requirements of low smoke, zero halogen and flame retardance, has better performances of elongation at break, ageing resistance, oil resistance, high and low temperature cracking resistance and the like, and can be more suitable for severe working environments of shield machine equipment.
2. The cable for the shield machine has the advantages that the adopted wrapping structure enables the cable to be more compact, the wire core is prevented from loosening when the inner sheath is extruded, and in addition, the cable has the effects of uniform internal electric field and reduced transition resistance.
3. According to the cable for the shield machine, the first semiconductor nylon strap layer and the second semiconductor nylon strap layer can better protect the conductor shielding layer and the insulating shielding layer, and partial discharge is avoided between the conductor or the metal shielding layer and the insulating layer.
4. The cable for the shield machine has the advantages of symmetrical integral structure, uniform stress, no stress concentration, reduced hidden danger of broken cores and prolonged service life.
5. According to the cable for the shield machine, the used metal shielding layer can better shield an electric field and also serves as a ground wire, and an extra ground wire core is not needed; the high coverage rate braided layer in the metal shielding layer can absorb more heat, so that the flame retardant effect of the cable is improved; the addition of high strength fiber filaments in the metallic shield layer increases the tensile strength of the cable.
6. According to the cable for the shield machine, the reinforcing layer is arranged, so that the cable can bear larger bending and stretching stress in a moving state, the wire core in the cable core is subjected to smaller stress concentration, and the normal operation of the cable is protected.
Drawings
Fig. 1 is a schematic structural view of a cable for a shield tunneling machine.
In the drawings
1-power wire core, 11-conductor, 12-first semi-conductive nylon belting layer, 13-conductor shielding layer, 14-insulating layer, 15-insulating shielding layer, 16-second semi-conductive nylon belting layer, 17-metal shielding layer, 2-filling reinforcement, 3-outer sheath, 31-wrapping layer, 32-inner sheath, 33-reinforcing layer, 34-outer sheath.
Detailed Description
The utility model will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.
As shown in fig. 1, a cable for a shield machine includes a power core 1 extending longitudinally, a filler reinforcement 2, and an outer sheath 3. Wherein, power sinle silk 1 is equipped with three and two circumscribes, all sets up in outer sheath 3. The filling reinforcement 2 is arranged in the gaps between the three power wire cores 1 and the outer protective layer 3. On the vertical and longitudinal cross section, the power wire core 1 comprises a conductor 11, a first semi-conductive nylon strap layer 12, a conductor shielding layer 13, an insulating layer 14, an insulating shielding layer 15, a second semi-conductive nylon strap layer 16 and a metal shielding layer 17 which are sequentially arranged from inside to outside, and the outer protective layer 3 comprises a wrapping layer 31, an inner protective sleeve 32, a reinforcing layer 33 and an outer protective sleeve 34 which are coaxially and sequentially arranged from inside to outside.
The conductor 11 is a 5 th tinned copper conductor, and is formed by a plurality of copper monofilaments through wire drawing, wire bundling and twisting, and Shu Si twisting and twisting directions are all in the same direction, so that the flexibility of the power wire core 1 is effectively ensured.
The first semi-conductive nylon strap layer 12 is distributed between the conductor 11 and the conductor shielding layer 13, and can be used for conducting the conductor 11 and the conductor shielding layer 13 while tightening the conductor 11 and preventing copper wires in the conductor 11 from accidentally damaging the conductor shielding layer 13; the second semi-conductive nylon strap layer 16 is distributed between the insulating shield layer 15 and the metal shield layer 17, and can prevent the braided copper wires in the metal shield layer 17 from being embedded into and damaging the insulating shield layer 15, thereby avoiding partial discharge between the conductor 11 or the metal shield layer 17 and the insulating layer 14.
The metal shielding layer 17 is formed by mixed braiding of tin-plated copper wires and fiber wires on the second semi-conductive nylon tape layer 16, the directions of the tin-plated copper wires and the fiber wires are opposite, the coverage rate of the tin-plated copper wires is more than or equal to 80%, and the higher coverage rate not only can well shield an electric field, but also can play a certain role in grounding protection, so that the metal shielding layer 17 can also serve as a ground wire. In addition, the high-coverage braided layer can absorb more heat, so that the insulating and shielding materials which are inflammable in the braided layer are more difficult to burn, and the flame retardant effect of the cable is improved to a certain extent. The single tensile strength of the fiber yarn is far higher than that of the tinned copper yarn, and the single tensile strength of the fiber yarn is introduced into the metal shielding layer 17, so that the power wire core 11 can bear more stress in the axial direction, and the tensile strength of the cable is improved.
The filling reinforcement 2 is distributed in the gaps at the center and around the three power wire cores 1, and the filling reinforcement 2 and the power wire cores 1 are uniformly and symmetrically distributed, so that when the cable is stressed, the stressed stress can be dispersed to the filling reinforcement 2 and each power wire core 1, the stress concentration phenomenon is eliminated, the risk of cable core breakage is reduced, and the cable has longer service life.
The wrapping layer 31 is overlapped and wrapped on the three power wire cores 1 and the plurality of filling reinforcing pieces 2, so that the loosening problem can be prevented when the power wire cores 1 and the filling reinforcing pieces 2 are in a cable, the roundness of the cable is ensured, the outer diameter of the cable is reduced, the material cost of the cable caused by non-roundness is reduced, and the effects of uniform internal electric field and transition resistance reduction can be achieved.
The inner sheath 32 is made of an ethylene propylene rubber mixture, which is different from the insulating layer 14, and the inner sheath 32 has lower requirements on electrical insulating performance, so that the ethylene propylene rubber mixture of the part increases the proportion of flame retardant and improves the flame retardant performance of the cable.
The reinforcing layer 33 is formed by bi-directionally knitting an imported aramid yarn (also called kevlar fiber), and the knitting density is not less than 60%. The reinforcing layer 33 is arranged, so that the cable can bear larger bending and stretching stress in a moving state, the wire core in the cable core is subjected to smaller stress concentration, and the normal operation of the cable is protected.
The outer sheath 34 is made of a thermosetting low smoke zero halogen flame retardant ethylene-vinyl acetate (EVM) elastomer mixture, and the material does not contain halogen, has an oxygen index as high as 34, and can enable the cable to pass a bunched combustion C test specified by GB/T18380 and halogen-free and low smoke tests specified by GB/T17650 and GB/T17651. Different from the traditional thermoplastic low-smoke halogen-free flame-retardant polyolefin (EVA) material, the material has higher vinyl acetate monomer content, so that the copolymer performance is more similar to that of rubber, the copolymer has better performances of elongation at break, ageing resistance, oil resistance, high-low temperature cracking resistance and the like, and the excellent performance can be more suitable for the severe working environment of shield tunneling machine equipment.
The foregoing examples are set forth in order to provide a more thorough description of the present utility model, and are not intended to limit the scope of the utility model, since modifications of the present utility model, in which equivalents thereof will occur to persons skilled in the art upon reading the present utility model, are intended to fall within the scope of the utility model as defined by the appended claims.
Claims (5)
1. The utility model provides a shield constructs machine cable which characterized in that: the cable comprises a power wire core (1) extending longitudinally, a filling reinforcement (2) and an outer protective layer (3), wherein the power wire core (1) is arranged in the outer protective layer (3), and the filling reinforcement (2) is arranged in a gap between the power wire core (1) and the outer protective layer (3); on the vertical longitudinal cross section, the power wire core (1) comprises a conductor (11), a conductor shielding layer (13), an insulating layer (14), an insulating shielding layer (15) and a metal shielding layer (17) which are sequentially arranged from inside to outside, and the outer protective layer (3) comprises a wrapping layer (31), an inner protective sleeve (32), a reinforcing layer (33) and an outer protective sleeve (34) which are coaxially and sequentially arranged from inside to outside; the outer sheath (34) is made of a thermosetting low-smoke halogen-free flame-retardant ethylene-vinyl acetate material.
2. The shield tunneling machine cable according to claim 1, wherein: a first semi-conductive nylon tape layer (12) is arranged between the conductor (11) and the conductor shielding layer (13), and a second semi-conductive nylon tape layer (16) is arranged between the insulating shielding layer (15) and the metal shielding layer (17).
3. The shield tunneling machine cable according to claim 1, wherein: the power wire cores (1) are three and are externally tangent in pairs, and the filling reinforcement (2) is arranged in gaps among the three power wire cores (1) and the outer protective layer (3).
4. The shield tunneling machine cable according to claim 1, wherein: the metal shielding layer (17) is formed by weaving tin-plated copper wires and fiber wires, the weaving directions of the tin-plated copper wires and the fiber wires are opposite, the number of ingots of the tin-plated copper wires and the fiber wires is the same, and the coverage rate of the tin-plated copper wires is more than or equal to 80%.
5. The shield tunneling machine cable according to claim 1, wherein: the reinforcing layer (33) is formed by adopting Kevlar fiber to weave bidirectionally, and the weaving density is not less than 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321472745.9U CN220491624U (en) | 2023-06-09 | 2023-06-09 | Cable for shield machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321472745.9U CN220491624U (en) | 2023-06-09 | 2023-06-09 | Cable for shield machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220491624U true CN220491624U (en) | 2024-02-13 |
Family
ID=89832209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321472745.9U Active CN220491624U (en) | 2023-06-09 | 2023-06-09 | Cable for shield machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220491624U (en) |
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2023
- 2023-06-09 CN CN202321472745.9U patent/CN220491624U/en active Active
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