CN111063483A - Low-temperature-resistant mobile flexible cable for open-pit mine and wrapping tape thereof - Google Patents
Low-temperature-resistant mobile flexible cable for open-pit mine and wrapping tape thereof Download PDFInfo
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- CN111063483A CN111063483A CN201911201401.2A CN201911201401A CN111063483A CN 111063483 A CN111063483 A CN 111063483A CN 201911201401 A CN201911201401 A CN 201911201401A CN 111063483 A CN111063483 A CN 111063483A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1865—Sheaths comprising braided non-metallic layers
Abstract
The invention discloses a low-temperature-resistant mobile flexible cable for open-air mines, which comprises a cable core, an inner sheath, a wrapping tape, a braided reinforcing layer and an outer sheath, wherein the inner sheath, the wrapping tape, the braided reinforcing layer and the outer sheath are sequentially coated outside the cable core, the wrapping tape is a specially-made hot-melt adhesive tape, the wrapping tape is wrapped outside a silicon rubber inner sheath according to the coverage rate of 1/4-1/2, the braided reinforcing layer is formed by braiding a plurality of high-strength fiber spindles, each high-strength fiber spindle is formed by twisting 2-4 high-strength fibers, and the braiding angle of the plurality of high-strength fibers in the braided reinforcing layer is 20-40 degrees; compared with the prior art, the low-temperature-resistant mobile flexible cable for the open pit mine is more wear-resistant and long in service life, solves the problem that the cable is hard at low temperature, enables the cable to have excellent flexibility at low temperature, reduces the cost of the cable, and meanwhile, the wrapping tape made of hot melt adhesive is arranged between the inner and outer sheaths, so that the adhesive force between the inner and outer sheaths is improved, and the inner and outer sheaths are prevented from sliding.
Description
Technical Field
The invention relates to a cable for mechanical equipment in the open-pit mining industry, in particular to a movable flexible cable for an electric drilling machine and a heading machine. In particular to a low-temperature-resistant movable flexible cable for open mines and a wrapping tape thereof.
Background
In areas such as Hulunebel in inner Mongolia of China, the temperature can reach-40-50 ℃ in winter, meanwhile, the working environment of the open-air mining industry is severe, and the whole cable is dragged and rubbed on ore, so that the cable is required to have good wear resistance and flexibility at low temperature.
At present, the cable is monopolized by foreign cables in the field because domestic cable products are difficult to achieve balance on low temperature resistance and wear resistance and can not meet the requirements of double standards. Through anatomy, the sheath material adopted by the foreign cable is a chlorinated polyethylene material which has good wear resistance, but low temperature resistance is not ideal, so that users are not satisfied with foreign brands of cables.
In addition, the heavy dragging cable is required to have good tensile and torsion resistance characteristics, the cable is required to have a double-layer sheath, fiber weaving reinforcement is adopted in the middle of the sheath to serve as a torsion resistant layer, good adhesion cannot be generated between the inner sheath and the outer sheath, finally, the inner sheath and the outer sheath slide relatively in the using process of a user, quality accidents such as trousers falling of the outer sheath and the like are caused, and the product quality is influenced.
Disclosure of Invention
The invention aims to solve the problems, the cable inner sheath is replaced by ultra-low temperature resistant silicon rubber, and the outer sheath is replaced by thermoplastic polyurethane with low temperature resistance and wear resistance to chlorinated polyethylene with poor low temperature resistance; simultaneously in order to solve and produce relative slip between the interior outer sheath, this application is solved from two aspects: 1. the weaving angle of the fibers of the reinforcing layer is reduced to 20-40 degrees from the original 60 degrees, so that the difficulty of trousers taking off is greatly increased; 2. and a cross-linked hot melt adhesive is wound between the inner sheath and the outer sheath, and the inner sheath and the outer sheath can be well bonded by the hot melt adhesive.
In order to realize the purpose of the invention, the invention adopts the following technical scheme: a low temperature resistant mobile flexible cable for open-pit mines comprises a cable core, an inner sheath, a wrapping tape, a braided reinforcing layer and an outer sheath which are sequentially coated outside the cable core, the cable core consists of a plurality of power wire cores, a plurality of ground wire cores and a ground wire detection wire core, the power wire core consists of a power wire conductor, a power wire insulator, a power wire non-metal shielding layer and a metal shielding layer, the ground wire core comprises a ground wire core conductor and a ground wire core semi-conducting layer, the ground wire detection wire core consists of a detection wire conductor and a detection wire insulating layer, the wrapping tape is a special hot melt adhesive tape, the wrapping tape is wrapped outside the inner sheath according to the coverage rate of 1/4-1/2, the braided reinforcing layer is formed by braiding a plurality of high-strength fiber spindles, each high-strength fiber spindle is formed by twisting 2-4 high-strength fibers, and the braiding angle of the plurality of high-strength fiber spindles in the braided reinforcing layer is 20-40 degrees.
Furthermore, the cable core is formed by concentrically twisting 3 power wire cores, 2 ground wire cores and 1 ground wire detection wire core.
Further, the inner sheath is made of high-strength low-temperature-resistant silicon rubber, wherein the strength of the silicon rubber is more than 10MPa, the elongation is 300-400%, the hardness is 60-65 ℃, and the elongation at the low temperature of-50 ℃ is more than 200%.
Further, the outer sheath is made of low-temperature-resistant and wear-resistant TPU, the strength of the outer sheath is greater than 25MPa, the elongation of the outer sheath is 400% -500%, and the hardness of the outer sheath is 73-77 ℃.
The formula of the hot melt adhesive tape for the low-temperature-resistant open-air mine mobile flexible cable is composed of EVA (ethylene vinyl acetate), TPU (thermoplastic polyurethane), DCP (DCP), DOP (dioctyl phthalate), an antioxidant, PE (polyethylene) wax, petroleum resin, terpene resin and maleic anhydride, and the raw material composition of the tape formula comprises the following components in parts by weight: EVA: 15-30 parts of a solvent; TPU: 15-30 parts of a solvent; DCP: 0.5-1 part; DOP: 0-5 parts; antioxidant: 0.5-1 part; PE wax: 5-10 parts; petroleum resin: 15-30 parts of a solvent; terpene resin: 15-30 parts of a solvent; maleic anhydride: 5-10 parts.
Further, the EVA is ethylene vinyl acetate with the VA content of 10-30%.
Further, the DCP is dicumyl peroxide.
Compared with the prior art, the low-cost high-performance winding drum flexible cable adopting the technical scheme has the following beneficial effects:
the low-temperature-resistant mobile flexible cable for the open pit mine is designed by starting from two aspects of low-temperature resistance and wear resistance, and solves the problems actually encountered by users at present, wherein the high-strength silicone rubber can ensure that the cable still has excellent flexibility at minus 50 ℃, and the TPU can ensure that the cable always has good wear resistance in summer or winter, so that the service life of the cable is ensured; the cable overcomes the problem that chlorinated polyethylene cables are hard in winter, and simultaneously solves the problems that silicone rubber outer sheath cables are not wear-resistant, and TPU outer sheath cables are poor in elasticity and high in cost;
for the cables which use silicon rubber and TPU as inner and outer sheaths by users at present, the defect that no adhesive force exists between the inner and outer sheaths exists, and the sliding between the inner and outer sheaths is easily generated in the using and dragging process, so that the problem of 'trousers falling' is caused to affect the use; according to the method, the cross-linked hot melt adhesive is manufactured into the wrapping tape, and the traditional hot melt adhesive is modified, so that the hot melt adhesive has good adhesiveness to both EVA and TPU, the adhesive force between the inner sheath and the outer sheath is improved to 10N/mm from 0, and the inner sheath and the outer sheath are ensured to be integrated;
compared with the prior art, the low-temperature-resistant mobile flexible cable for the open pit mine is more wear-resistant and long in service life, solves the problem that the cable is hard at low temperature, enables the cable to have excellent flexibility at low temperature, reduces the cost of the cable, and meanwhile, the wrapping tape made of hot melt adhesive is arranged between the inner and outer sheaths, so that the adhesive force between the inner and outer sheaths is improved, and the inner and outer sheaths are prevented from sliding.
Drawings
Fig. 1 is a schematic structural diagram of the low temperature resistant mobile flexible cable for the open pit mine.
Reference numerals: 1. a power wire core; 11. a power line conductor; 12. insulating a power line; 13. a non-metal shielding layer of the power line; 14. a metal shielding layer; 2. a ground wire core; 21. a ground core conductor; 22. a ground core conductor semiconductive tape; 3. a ground wire detection wire core; 31. detecting the line conductor; 32. detecting a line insulating layer; 4. an inner sheath; 5. wrapping a tape; 6. weaving the reinforcing layer; 7. an outer sheath.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a low temperature resistant mobile flexible cable for open-air mines comprises a cable core, an inner sheath 4, a wrapping tape 5, a braided reinforcing layer 6 and an outer sheath 7 which are sequentially coated outside the cable core, wherein the cable core comprises a plurality of power wire cores 1, a plurality of ground wire cores 2 and a ground wire detection wire core 3, the power wire cores 1 comprise power wire conductors 11, power wire insulators 12, power wire non-metal shielding layers 13 and metal shielding layers 14, the ground wire cores 2 comprise ground wire core 2 conductors and ground semiconductor wire core layers 22, the ground wire detection wire cores 3 comprise detection wire conductors 31 and detection wire insulating layers 32, the wrapping tape 5 is a specially-made hot melt adhesive tape, the wrapping tape 5 is wrapped outside the inner sheath 4 according to the coverage rate of 1/4-1/2, the braided reinforcing layer 6 is formed by braiding a plurality of high-strength fiber ingots, and each high-strength fiber ingot is formed by twisting 2-4 high-strength fibers, the weaving angle of a plurality of high-strength fiber spindles in the weaving reinforcing layer 6 is 20-40 degrees; the high strength fiber is 1500D fiber.
Furthermore, the cable core is formed by 3 power sinle silks 1, 2 ground wire cores 2 and 1 ground wire detection sinle silk 3 transposition of heart.
Further, the inner sheath 4 is made of high-strength low-temperature-resistant silicon rubber, wherein the strength of the silicon rubber is more than 10MPa, the elongation is 300-400%, the hardness is 60-65 ℃, and the elongation at the low temperature of-50 ℃ is more than 200%.
Further, the outer sheath 7 is made of low-temperature-resistant and wear-resistant TPU, the strength of the outer sheath is greater than 25MPa, the elongation of the outer sheath is 400% -500%, and the hardness of the outer sheath is 73-77 ℃.
The formula of the wrapping tape 5 is composed of EVA, TPU, DCP, DOP, an antioxidant, PE wax, petroleum resin, terpene resin and maleic anhydride, and the raw material composition of the wrapping tape 5 comprises the following components in parts by weight: EVA: 15-30 parts of a solvent; TPU: 15-30 parts of a solvent; DCP: 0.5-1 part; DOP: 0-5 parts; antioxidant: 0.5-1 part; PE wax: 5-10 parts; petroleum resin: 15-30 parts of a solvent; terpene resin: 15-30 parts of a solvent; maleic anhydride: 5-10 parts.
Further, the EVA is ethylene vinyl acetate with the VA content of 10-30%.
Further, the DCP is dicumyl peroxide and is used as an initiator for grafting maleic anhydride and provides free radicals for a hot melt adhesive system, the antioxidant is a phenol antioxidant such as 2246, petroleum resin and terpene resin are used for tackifying the system and improving the adhesive force between the inner sheath 7 and the outer sheath 7, and the maleic anhydride is used for introducing a grafting structure between non (low) polarity EVA and polar TPU and is used as a compatilizer and is beneficial to improving the adhesive force at the same time.
Example 1
The prepared power wire core 1, the ground wire core 2 and the ground wire detection wire core 3 are concentrically stranded with a cable core, the stranding pitch diameter ratio is 6 times, and the stranding direction is rightward;
preparation of the inner sheath 4: extruding a silicon rubber inner sheath 4 with corresponding thickness outside the prepared cable core;
preparing a wrapping tape 5: preparing a hot melt adhesive tape with the width of 40mm and the thickness of 0.2mm by a film blowing machine and a splitting machine, and then wrapping the hot melt adhesive tape outside the silicon rubber inner sheath 4 according to the coverage rate of 1/4;
preparation of the braided reinforcing layer 6: knitting by using an 18-spindle knitting machine, wherein each spindle adopts 2 pieces of high-strength fibers, the knitting angle is 40 degrees, and the high-strength fibers are 1500D fibers;
preparation of the outer sheath 7: and extruding a TPU outer sheath 7 with corresponding thickness outside the braided reinforcing layer 6.
The formula of the hot melt adhesive for the wrapping tape 5 comprises 15 parts of EVA (ethylene vinyl acetate), 30 parts of TPU (thermoplastic polyurethane), 0.5 part of DCP (DCP), 5 parts of DOP (dioctyl phthalate), 1 part of antioxidant, 10 parts of PE (polyethylene) wax, 15 parts of petroleum resin, 15 parts of terpene resin and 5 parts of maleic anhydride. The cable thus produced had a peel force between the inner and outer jackets 7 of 6.3N/mm.
Example 2
And (3) cabling the prepared power wire core 1, the ground wire core 2 and the ground wire detection wire core 3, wherein the cabling pitch diameter ratio is 7 times, and the twisting direction is rightward.
Preparation of the inner sheath 4: extruding a silicon rubber inner sheath 4 with corresponding thickness outside the prepared cable core;
preparing a wrapping tape 5: preparing a hot melt adhesive tape with the width of 50mm and the thickness of 0.3mm by a film blowing machine and a splitting machine, and then wrapping the hot melt adhesive tape outside the silicon rubber inner sheath 4 according to the coverage rate of 1/3;
preparation of the braided reinforcing layer 6: the knitting adopts an 18-spindle knitting machine, each spindle has 4 high-strength fibers, the knitting angle is 30 degrees, and the high-strength fibers are 1500D fibers.
Preparation of the outer sheath 7: and extruding a TPU outer sheath 7 with corresponding thickness outside the braided layer.
The formula of the hot melt adhesive for the wrapping tape 5 comprises 22 parts of EVA (ethylene vinyl acetate), 22 parts of TPU (thermoplastic polyurethane), 0.8 part of DCP (DCP), 2.5 parts of DOP (dioctyl phthalate), 0.5 part of antioxidant, 5 parts of PE (polyethylene) wax, 22 parts of petroleum resin, 22 parts of terpene resin and 8 parts of maleic anhydride, and the stripping force between the inner sheath 7 and the outer sheath 7 of the produced cable is 8.5N/mm.
Example 3
Cabling is carried out on the prepared power wire core 1, the prepared ground wire core 2 and the prepared ground wire detection wire core 3, the cabling pitch diameter ratio is 8 times, and the twisting direction is rightward;
preparation of the inner sheath 4: extruding a silicon rubber inner sheath 4 with corresponding thickness outside the prepared cable core;
preparing a wrapping tape 5: preparing a hot melt adhesive tape with the width of 60mm and the thickness of 0.5mm by a film blowing machine and a splitting machine, and then wrapping the hot melt adhesive tape outside the silicon rubber inner sheath 4 according to the coverage rate of 1/2;
preparation of the braided reinforcing layer 6: knitting by using an 18-spindle knitting machine, wherein 4 high-strength fibers are arranged in each spindle, the knitting angle is 20 degrees, and the high-strength fibers are 1500D fibers;
preparation of the outer sheath 7: and extruding a TPU outer sheath 7 with corresponding thickness outside the braided layer.
The formula of the hot melt adhesive for the wrapping tape 5 comprises 30 parts of EVA (ethylene vinyl acetate), 15 parts of TPU (thermoplastic polyurethane), 1 parts of DCP (DCP), 0 parts of DOP (dioctyl phthalate), 0.3 part of antioxidant, 5 parts of PE (polyethylene) wax, 30 parts of petroleum resin, 30 parts of terpene resin and 10 parts of maleic anhydride. The cable thus produced had a peel force between the inner and outer jackets 7 of 10N/mm.
The low-temperature-resistant mobile flexible cable for the open pit mine is designed by starting from two aspects of low-temperature resistance and wear resistance, and solves the problems actually encountered by users at present, wherein the high-strength silicone rubber can ensure that the cable still has excellent flexibility at minus 50 ℃, and the TPU can ensure that the cable always has good wear resistance in summer or winter, so that the service life of the cable is ensured; the cable overcomes the problem that chlorinated polyethylene cables are hard in winter, and simultaneously solves the problems that the cable with the silicon rubber outer sheath 7 is not wear-resistant, the cable with the TPU outer sheath has poor elasticity and high cost;
for the cables which use silicon rubber and TPU as inner and outer sheaths by users at present, the defect that no adhesive force exists between the inner and outer sheaths exists, and the sliding between the inner and outer sheaths is easily generated in the using and dragging process, so that the problem of 'trousers falling' is caused to affect the use; according to the application, the cross-linked hot melt adhesive is manufactured into the wrapping tape 5, and the traditional hot melt adhesive is modified, so that the hot melt adhesive has good adhesiveness to both EVA and TPU, the adhesive force between the inner sheath 7 and the outer sheath 7 is improved from 0 to about 10N/mm at most, and the inner sheath 7 and the outer sheath 7 are ensured to be integrated;
compared with the prior art, the low-temperature-resistant mobile flexible cable for the open pit mine is more wear-resistant and long in service life, solves the problem that the cable is hard at low temperature, enables the cable to have excellent flexibility at low temperature, reduces the cost of the cable, and meanwhile, the wrapping tape 5 made of hot melt adhesive is arranged between the inner sheath and the outer sheath, so that the adhesive force between the inner sheath and the outer sheath is improved, and the inner sheath and the outer sheath are prevented from sliding.
The above is the preferred embodiment of the present invention, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the principle of the present invention (for example, when the power line is used in a high voltage cable, there are three co-extruded inner shield layer insulation and outer shield layer structures), which should also be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a low temperature resistant is removal flexible cable for open-pit mine which characterized in that: comprises a cable core, an inner sheath, a wrapping tape, a braided reinforcing layer and an outer sheath which are sequentially coated outside the cable core, the cable core consists of a plurality of power wire cores, a plurality of ground wire cores and a ground wire detection wire core, the power wire core consists of a power wire conductor, a power wire insulator, a power wire non-metal shielding layer and a metal shielding layer, the ground wire core comprises a ground wire core conductor and a ground wire core semi-conducting layer, the ground wire detection wire core consists of a detection wire conductor and a detection wire insulating layer, the wrapping tape is a special hot melt adhesive tape, the wrapping tape is wrapped outside the inner sheath according to the coverage rate of 1/4-1/2, the braided reinforcing layer is formed by braiding a plurality of high-strength fibers, each high-strength fiber spindle is formed by twisting 2-4 high-strength fibers, and the braiding angle of the plurality of high-strength fiber spindles in the braided reinforcing layer is 20-40 degrees.
2. The mobile flexible cable for the low-temperature-resistant open pit mine according to claim 1, wherein: the cable core is formed by concentrically twisting 3 power wire cores, 2 ground wire cores and 1 ground wire detection wire core.
3. The mobile flexible cable for the low-temperature-resistant open pit mine according to claim 1, wherein: the inner sheath is made of high-strength low-temperature-resistant silicon rubber, wherein the strength of the silicon rubber is more than 10MPa, the elongation is 300-400%, the hardness is 60-65 ℃, and the elongation at the low temperature of-50 ℃ is more than 200%.
4. The mobile flexible cable for the low-temperature-resistant open pit mine according to claim 1, wherein: the outer sheath is made of low-temperature-resistant wear-resistant TPU, the strength of the outer sheath is greater than 25MPa, the elongation is 400% -500%, and the hardness is 73-77 ℃.
5. The hot melt adhesive wrapping tape for the low temperature resistant mobile flexible cable for the open pit mine according to claim 1, which is characterized in that: the formula of the wrapping tape comprises EVA, TPU, DCP, DOP, an antioxidant, PE wax, petroleum resin, terpene resin and maleic anhydride, and the raw material composition of the formula of the wrapping tape comprises the following components in parts by weight: EVA: 15-30 parts of a solvent; TPU: 15-30 parts of a solvent; DCP: 0.5-1 part; DOP: 0-5 parts; antioxidant: 0.5-1 part; PE wax: 5-10 parts; petroleum resin: 15-30 parts of a solvent; terpene resin: 15-30 parts of a solvent; maleic anhydride: 5-10 parts.
6. The hot melt adhesive taped wrapping tape of the low temperature resistant flexible cable for the open pit mine according to claim 5, wherein: the EVA is ethylene vinyl acetate with the VA content of 10-30%.
7. The hot melt adhesive taped wrapping tape of the low temperature resistant flexible cable for the open pit mine according to claim 5, wherein: the DCP is dicumyl peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911201401.2A CN111063483B (en) | 2019-11-29 | 2019-11-29 | Low-temperature-resistant mobile flexible cable for open-pit mine and wrapping tape thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911201401.2A CN111063483B (en) | 2019-11-29 | 2019-11-29 | Low-temperature-resistant mobile flexible cable for open-pit mine and wrapping tape thereof |
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| CN111063483A true CN111063483A (en) | 2020-04-24 |
| CN111063483B CN111063483B (en) | 2021-02-09 |
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Cited By (1)
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| CN111696715A (en) * | 2020-06-22 | 2020-09-22 | 中天科技装备电缆有限公司 | Flexible cable with sheath and preparation method thereof |
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| CN111696715A (en) * | 2020-06-22 | 2020-09-22 | 中天科技装备电缆有限公司 | Flexible cable with sheath and preparation method thereof |
| CN111696715B (en) * | 2020-06-22 | 2021-06-29 | 中天科技装备电缆有限公司 | Flexible cable with sheath and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN111063483B (en) | 2021-02-09 |
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