CN114446518A - Multi-core branch cable and preparation method thereof - Google Patents
Multi-core branch cable and preparation method thereof Download PDFInfo
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- CN114446518A CN114446518A CN202210117314.4A CN202210117314A CN114446518A CN 114446518 A CN114446518 A CN 114446518A CN 202210117314 A CN202210117314 A CN 202210117314A CN 114446518 A CN114446518 A CN 114446518A
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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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
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- C08L9/02—Copolymers with acrylonitrile
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- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
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- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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- 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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- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
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- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
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Abstract
The invention discloses a multi-core branch cable, which comprises a main cable body and a branch cable body communicated with the lower end of the side wall of the main cable body; the main cable body comprises a plurality of conductors distributed in an annular array, an inner insulating layer, an outer insulating layer, filling, a water blocking layer, an aluminum-plastic composite layer and an outer sheath, wherein the inner insulating layer and the outer insulating layer are arranged outside the conductors, the inner insulating layer is an irradiation crosslinking polyethylene insulating material, the outer insulating layer is an irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin insulating material, and double-layer co-extrusion is adopted during insulation extrusion; filling gaps of the cable core with water-blocking yarns, and wrapping the water-blocking tapes outside the cable core; the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with a layer of high-density polyethylene sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the branch cable body comprises a bulge communicated with the outer sheath, and the branch cable body also comprises a branch conductor penetrating through the bulge into the main cable body. The multi-core branch cable designed by adopting the device components has excellent performance, and is environment-friendly and energy-saving.
Description
Technical Field
The invention relates to the field of cable devices, in particular to a multi-core branch cable and a preparation method thereof.
Background
China is a large country for manufacturing and using cables, with the development of capital construction in China, the use amount of the cables is large, the cables are widely used based on the cables, in order to standardize the manufacturing quality standard of the cables, in 2014, the Ministry of construction in Minnan reviews two recommended industrial standards (JG/T441-2014 and JG/T442-2014) for the wires and the cables for buildings, and the standard firstly promotes the service life of the wires and the cables to be not less than 70 years.
In the using process of the cable, as the cable insulating layer is aged gradually in normal operation, if the using time exceeds a certain age, safety accidents such as electric leakage, fire and the like can be caused. However, since the price of the cable is generally high and the replacement difficulty is high, many wires and cables are excessively used to save cost and avoid troubles. Meanwhile, some cable manufacturing enterprises use inferior raw materials in consideration of costs. The above factors all result in the occurrence of safety accidents. After the industry of the department of housing and construction publishes, the long-life cable is selected by some high-rise buildings and key public facilities, and becomes a development opportunity of cable enterprises. On the basis, in order to meet the requirements of customers on water resistance and environmental protection, the company provides a long-service-life, water-resistant and environment-friendly multi-core low-voltage power cable. The insulating layer adopts double-layer co-extrusion, and the extruded insulating layer is irradiated and crosslinked by an electron accelerator, so that the performance, the service temperature and the service life of the insulating material are improved; the waterproof layer comprises a water-blocking tape wrapped outside the cable core, an aluminum-plastic composite tape layer and an outer sheath, and the materials do not contain halogen, lead, cadmium and other components.
Disclosure of Invention
The invention aims to provide a multi-core branch cable.
The invention solves the technical problems through the following technical scheme:
a multi-core branch cable comprises a main cable body and a branch cable body communicated with the lower end of the side wall of the main cable body;
the main cable body comprises a plurality of conductors, inner insulating layers, outer insulating layers, filling layers, water blocking layers, aluminum-plastic composite layers and an outer sheath, wherein the conductors are distributed in an annular array manner, the inner insulating layers and the outer insulating layers are arranged outside the conductors, the inner insulating layers are made of irradiation crosslinking polyethylene insulating materials, the outer insulating layers are made of irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin insulating materials, and double-layer co-extrusion is adopted during insulation extrusion; filling gaps of the cable core with water-blocking yarns, and wrapping the water-blocking tapes outside the cable core; the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with a layer of high-density polyethylene sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole;
the branch cable body comprises a bulge communicated with the outer sheath, and the branch cable body also comprises a branch conductor penetrating through the bulge into the main cable body.
Preferably, the conductor and the branch conductor both adopt the 1 st or 2 nd copper conductor required by GB/T3956-.
Preferably, the thickness of the inner layer insulation accounts for 15% -20% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 80% -85% of the total thickness of the insulation.
Preferably, the outer sheath is fixedly connected with a clamping piece;
the clamping piece comprises a ring body fixedly connected to the outer sheath, and a plurality of clamping grooves distributed annularly are formed in the ring body.
Preferably, the outer sheath is prepared from the following raw materials in parts by weight: 40-60 parts of nitrile rubber, 15-30 parts of polyvinyl chloride, 2-5 parts of sulfur powder, 5-10 parts of modified mica powder, 3-6 parts of nano bauxite, 3-8 parts of nano silicon nitride, 2-5 parts of light calcium powder, 3-5 parts of chlorinated paraffin, 1-3 parts of zinc oxide, 3-6 parts of quintic methyl thiuram tetrasulfide, 0.5-1.5 parts of an accelerator TMDT and 0.3-0.7 part of a plasticizer.
Preferably, the plasticizer is a mixture of coumarone resin and DOP in a weight ratio of 1: 10.
The invention also discloses a preparation method of the multi-core branch cable, which is characterized by comprising the following steps:
(1) selecting a conductor: the 1 st solid or 2 nd twisted round compacted copper conductor required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation materials, the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation materials, the inner layer insulation thickness accounts for 15% -20% of the total insulation thickness, and the outer layer insulation thickness accounts for 80% -85% of the total insulation thickness. (ii) a The extrusion linear speed is 80-120 m/min during the double-layer coextrusion, and the extrusion temperature is 100-150 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete an insulating layer irradiation crosslinking process, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 20-30, the linear speed is 30-50 m/min, and large-beam downward wiring is adopted;
(3) cabling and filling: the cable cores are cabled in the right direction, the gaps are filled with water-blocking yarns to be round, meanwhile, water-blocking tapes are wrapped outside the cable cores, and the width of the water-blocking tapes is 20% -30% of that of the tapes;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with an environment-friendly high-density polyethylene sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20-30% of the width of the belt material, and is firmly welded by hot air.
Preferably, in the preparation method of the multi-core branch cable, the thickness of the inner layer insulation accounts for 18% -19% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 80% -85% of the total thickness of the insulation. (ii) a The extrusion linear speed is 90-110m/min during the double-layer coextrusion, and the extrusion temperature is 95-125 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete the irradiation crosslinking process of the insulating layer, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 25-28, the linear speed is 35-40m/min, and a large beam is adopted for downward wiring.
Preferably, the thickness of the inner layer insulation accounts for 19% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 83% of the total thickness of the insulation; the extrusion linear speed is 100m/min during the double-layer coextrusion process, and the extrusion temperature is 110 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; and (3) finishing an insulating layer irradiation crosslinking process by using an AB-2.5MeV high-frequency high-voltage electron accelerator, wherein the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 26, the linear speed is 38m/min, and large-beam lower wire arrangement is adopted.
Preferably, the clamping piece is made of polytetrafluoroethylene materials.
Compared with the prior art, the invention has the following advantages:
the invention discloses a multi-core branch cable, which is characterized in that a main cable body and a branch cable body communicated with the lower end of the side wall of the main cable body are designed; the main cable body comprises a plurality of conductors distributed in an annular array, an inner insulating layer, an outer insulating layer, filling, a water blocking layer, an aluminum-plastic composite layer and an outer sheath, wherein the inner insulating layer and the outer insulating layer are arranged outside the conductors, the inner insulating layer is an irradiation crosslinking polyethylene insulating material, the outer insulating layer is an irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin insulating material, and double-layer co-extrusion is adopted during insulation extrusion; filling gaps of the cable core with water-blocking yarns, and wrapping the cable core with a water-blocking tape; longitudinally coating the water-blocking tape with an aluminum-plastic composite tape, tightly extruding a layer of high-density polyethylene sheath outside the aluminum-plastic composite tape, and fixedly connecting the aluminum-plastic composite tape and the high-density polyethylene sheath into a whole; the branch cable body comprises a bulge communicated with the outer sheath, and the branch cable body also comprises a branch conductor penetrating through the bulge into the main cable body. The multi-core branch cable designed by adopting the device components has excellent performance, is environment-friendly and energy-saving;
in addition, the outer sheath of the invention takes the nitrile rubber as the main material, and the nitrile rubber has good physical and mechanical properties and chemical stability, so that the weather resistance and mechanical properties of the outer sheath can be improved, and the polyvinyl chloride is added to modify the nitrile rubber, so that the properties of the nitrile rubber and the polyvinyl chloride are coordinated, the adhesion and compatibility of the nitrile rubber are improved, and the excellent weather resistance, aging resistance and wear resistance of the outer sheath are endowed; meanwhile, modified mica powder, nano bauxite, nano silicon nitride and light calcium powder which have good compatibility with the nitrile rubber and the polyvinyl chloride are added, so that the mechanical property of the sheath material can be improved, and the sheath material is endowed with excellent weather resistance and wear resistance.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a clip member according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multi-core branch cable according to an embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
EXAMPLE 1 Multi-core Branch Cable
As shown in fig. 1 to 3, a multi-core branch cable includes a main cable body a and a branch cable body B communicated with a lower end of a side wall of the main cable body a;
the main cable body A comprises a plurality of conductors 1 distributed in an annular array, an inner insulating layer 2, an outer insulating layer 3, a filling layer 4, a water-blocking layer 5, an aluminum-plastic composite layer 6 and an outer sheath 7, wherein the inner insulating layer 2 and the outer insulating layer 3 are arranged outside the conductors 1, the inner insulating layer 2 is an irradiation crosslinking polyethylene insulating material, the outer insulating layer 3 is an irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin insulating material, and double-layer co-extrusion is adopted during insulating extrusion; filling gaps of 4 cable cores with water-blocking yarns, and wrapping the water-blocking tapes outside the cable cores; the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with a sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole;
the branch cable body B includes a projection communicating with the outer jacket 7, and the branch cable body B further includes a branch conductor 1 penetrating the projection into the main cable body A.
The outer sheath 7 is fixedly connected with a clamping piece 8; the clamping piece 8 comprises a ring body fixedly connected to the outer sheath 7, and a plurality of clamping grooves 81 distributed annularly are formed in the ring body. Through the design of the clamping pieces 8, adjacent cables are clamped into a whole in the cable installation process, and particularly the clamping pieces 8 are clamped into the adjacent cables. The clamping piece 8 is made of polytetrafluoroethylene materials, and the cable is clamped into a whole through clamping.
The conductor 1 and the branch conductor 1 both adopt the 1 st or 2 nd copper conductor 1 required by GB/T3956-. The thickness of the inner layer insulation accounts for 15% -20% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 80% -85% of the total thickness of the insulation.
As shown in fig. 1-3, the invention also discloses a preparation method of the multi-core branch cable, which comprises the following steps:
(1) selecting a conductor 1: the 1 st solid or 2 nd twisted round compacted copper conductor 1 required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation material, and the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation material, wherein the inner layer insulation thickness accounts for 15% -20% of the total insulation thickness, and the outer layer insulation thickness accounts for 80% -85% of the total insulation thickness. (ii) a The extrusion linear speed is 80-120 m/min during the double-layer coextrusion, and the extrusion temperature is 100-150 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete an insulating layer irradiation crosslinking process, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 20-30, the linear speed is 30-50 m/min, and large-beam downward wiring is adopted;
(3) cabling and filling 4: the cable core is cabled in the right direction, 4 round gaps are filled with water-blocking yarns, and meanwhile, a water-blocking tape wraps the cable core, and the lapping of the water-blocking tape is 20% -30% of the width of the tape;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and an outer sheath is tightly extruded outside the aluminum-plastic composite tape and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20-30% of the width of the belt material, and is firmly welded by hot air.
As shown in fig. 1-3, the invention also discloses a preparation method of the multi-core branch cable, which comprises the following steps:
(1) selecting a conductor 1: the 1 st solid or 2 nd twisted round compacted copper conductor 1 required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation material, and the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation material, wherein the inner layer insulation thickness accounts for 15% of the total insulation thickness, and the outer layer insulation thickness accounts for 80% of the total insulation thickness; the extrusion linear speed is 80-120 m/min during the double-layer coextrusion, and the extrusion temperature is 100 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete the irradiation crosslinking process of the insulating layer, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 30, the linear speed is 50m/min, and large-beam lower wire arrangement is adopted;
(3) cabling and filling 4: the cable core is cabled in the right direction, 4 round gaps are filled with water-blocking yarns, and meanwhile, a water-blocking tape wraps the cable core, and the lapping of the water-blocking tape is 30% of the width of the tape;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and an outer sheath is tightly extruded outside the aluminum-plastic composite tape and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20-30% of the width of the belt material, and is firmly welded by hot air.
As shown in fig. 1-3, the invention also discloses a preparation method of the multi-core branch cable, which comprises the following steps:
(1) selecting a conductor 1: the 1 st solid or 2 nd twisted round compacted copper conductor 1 required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation material, and the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation material, wherein the inner layer insulation thickness accounts for 20% of the total insulation thickness, and the outer layer insulation thickness accounts for 85% of the total insulation thickness; the extrusion linear speed is 120m/min during the double-layer coextrusion, and the extrusion temperature is 100-150 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete the irradiation crosslinking process of the insulating layer, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 20, the linear speed is 30m/min, and large-beam lower wire arrangement is adopted;
(3) cabling and filling 4: the cable core is cabled in the right direction, 4 round gaps are filled with water-blocking yarns, and meanwhile, a water-blocking tape wraps the cable core, and the lapping of the water-blocking tape is 20% of the width of the tape;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and an outer sheath is tightly extruded outside the aluminum-plastic composite tape and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20% of the width of the belt material, and the aluminum-plastic composite belt longitudinal wrap is firmly welded by hot air.
EXAMPLE 5 preparation method of Multi-core Branch Cable
As shown in fig. 1-3, the invention also discloses a preparation method of the multi-core branch cable, which comprises the following steps:
(1) selecting a conductor 1: the 1 st solid or 2 nd twisted round compacted copper conductor 1 required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation material, and the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation material, wherein the inner layer insulation thickness accounts for 19% of the total insulation thickness, and the outer layer insulation thickness accounts for 83% of the total insulation thickness; the extrusion linear speed is 100m/min during the double-layer coextrusion process, and the extrusion temperature is 110 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete the irradiation crosslinking process of the insulating layer, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 26, the linear speed is 38m/min, and large-beam lower wiring is adopted;
(3) cabling and filling 4: the cable core is cabled in the right direction, 4 round gaps are filled with water-blocking yarns, and meanwhile, a water-blocking tape wraps the cable core, and the lapping of the water-blocking tape is 20% of the width of the tape;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and an outer sheath is tightly extruded outside the aluminum-plastic composite tape and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20% of the width of the belt material, and the aluminum-plastic composite belt longitudinal wrap is firmly welded by hot air.
EXAMPLE 6 outer sheath composition
The outer sheath is prepared from the following raw materials in parts by weight: 40-60 parts of nitrile rubber, 15-30 parts of polyvinyl chloride, 2-5 parts of sulfur powder, 5-10 parts of modified mica powder, 3-6 parts of nano bauxite, 3-8 parts of nano silicon nitride, 2-5 parts of light calcium powder, 3-5 parts of chlorinated paraffin, 1-3 parts of zinc oxide, 3-6 parts of quintic methyl thiuram tetrasulfide, 0.5-1.5 parts of an accelerator TMDT and 0.3-0.7 part of a plasticizer.
Further preferably, the outer sheath is prepared from the following raw materials in parts by weight: 50 parts of nitrile butadiene rubber, 23 parts of polyvinyl chloride, 3.5 parts of sulfur powder, 7.5 parts of modified mica powder, 4.5 parts of nano bauxite, 5.5 parts of nano silicon nitride, 3.5 parts of light calcium powder, 4 parts of chlorinated paraffin, 2 parts of zinc oxide, 4.5 parts of dipentamethylenethiuram tetrasulfide, 1 part of an accelerator TMDT and 0.5 part of a plasticizer.
Further preferably, the plasticizer is a mixture of coumarone resin and DOP in a weight ratio of 1: 10.
In conclusion, the invention provides the waterproof environment-friendly multi-core low-voltage power cable with long service life, the insulating layer adopts double-layer co-extrusion, and the performance, the service temperature and the service life of the insulating material are improved through irradiation crosslinking of the electronic accelerator after the extrusion; the waterproof layer comprises a water-blocking tape wrapped outside the cable core, an aluminum-plastic composite tape layer and an outer sheath, and the materials do not contain halogen, lead, cadmium and other components.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A multi-core branch cable is characterized by comprising a main cable body and a branch cable body communicated with the lower end of the side wall of the main cable body;
the main cable body comprises a plurality of conductors, inner insulating layers, outer insulating layers, filling layers, water blocking layers, aluminum-plastic composite layers and an outer sheath, wherein the conductors are distributed in an annular array manner, the inner insulating layers and the outer insulating layers are arranged outside the conductors, the inner insulating layers are made of irradiation crosslinking polyethylene insulating materials, the outer insulating layers are made of irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin insulating materials, and double-layer co-extrusion is adopted during insulation extrusion; filling gaps of the cable core with water-blocking yarns, and wrapping the water-blocking tapes outside the cable core; the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with a sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole;
the branch cable body comprises a bulge communicated with the outer sheath, and the branch cable body also comprises a branch conductor penetrating through the bulge into the main cable body.
2. The multi-core branch cable as claimed in claim 1, wherein the conductors and the branch conductors are made of the type 1 or type 2 copper conductors as required in GB/T3956-2008.
3. The multi-core branch cable of claim 2 wherein the thickness of the inner insulation is 15% to 20% of the total thickness of the insulation, and the thickness of the outer insulation is 80% to 85% of the total thickness of the insulation.
4. The multi-core branch cable as claimed in claim 3, wherein a clamping member is fixedly connected to the outer sheath;
the clamping piece comprises a ring body fixedly connected to the outer sheath, and a plurality of clamping grooves distributed annularly are formed in the ring body.
5. The multi-core branch cable as claimed in claim 1, wherein the outer sheath is made from the following raw materials in parts by weight: 40-60 parts of nitrile rubber, 15-30 parts of polyvinyl chloride, 2-5 parts of sulfur powder, 5-10 parts of modified mica powder, 3-6 parts of nano bauxite, 3-8 parts of nano silicon nitride, 2-5 parts of light calcium powder, 3-5 parts of chlorinated paraffin, 1-3 parts of zinc oxide, 3-6 parts of quintic methyl thiuram tetrasulfide, 0.5-1.5 parts of an accelerator TMDT and 0.3-0.7 part of a plasticizer.
6. The multi-core branch cable of claim 5, wherein the plasticizer is a mixture of coumarone resin and DOP in a weight ratio of 1: 10.
7. A method for preparing a multi-core branch cable according to any one of claims 1 to 6, comprising the steps of:
(1) selecting a conductor: the 1 st solid or 2 nd twisted round compacted copper conductor required by GB/T3956-;
(2) insulating extrusion and crosslinking: double-layer co-extrusion of an irradiation crosslinking polyethylene insulating material and a halogen-free low-smoke flame-retardant irradiation crosslinking polyolefin insulating material is adopted, and an extruded insulating layer is subjected to irradiation crosslinking by adopting an electron accelerator;
the insulating extrusion step comprises: the inner layer insulation is made of natural-color irradiation crosslinking polyethylene insulation material, and the outer layer insulation is made of colored halogen-free low-smoke irradiation crosslinking olefin insulation material, wherein the inner layer insulation thickness accounts for 15% -20% of the total insulation thickness, and the outer layer insulation thickness accounts for 80% -85% of the total insulation thickness. (ii) a The extrusion linear speed is 80-120 m/min during the double-layer coextrusion of the insulation, and the extrusion temperature is 100-150 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete an insulating layer irradiation crosslinking process, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 20-30, the linear speed is 30-50 m/min, and large-beam downward wiring is adopted;
(3) cabling and filling: the cable cores are cabled in the right direction, the gaps are filled with water-blocking yarns to be round, meanwhile, water-blocking tapes are wrapped outside the cable cores, and the width of the water-blocking tapes is 20% -30% of that of the tapes;
(4) waterproof jacket layer: the water-blocking tape is longitudinally coated by an aluminum-plastic composite tape, and the aluminum-plastic composite tape is tightly extruded with an environment-friendly high-density polyethylene sheath and is fixedly connected with the aluminum-plastic composite tape layer into a whole; the lapping cover of the aluminum-plastic composite belt longitudinal wrap is 20-30% of the width of the belt material, and is firmly welded by hot air.
8. The method for preparing the multi-core branch cable according to claim 7, wherein the thickness of the inner layer insulation accounts for 18-19% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 80-85% of the total thickness of the insulation. (ii) a The extrusion linear speed is 90-110m/min during the double-layer coextrusion, and the extrusion temperature is 95-125 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; an AB-2.5MeV high-frequency high-voltage electron accelerator is adopted to complete the irradiation crosslinking process of the insulating layer, the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 25-28, the linear speed is 35-40m/min, and a large beam is adopted for downward wiring.
9. The method for preparing the multi-core branch cable according to claim 8, wherein the thickness of the inner layer insulation accounts for 19% of the total thickness of the insulation, and the thickness of the outer layer insulation accounts for 83% of the total thickness of the insulation; the extrusion linear speed is 100m/min during the double-layer coextrusion process, and the extrusion temperature is 110 ℃;
the crosslinking step is as follows: after the insulating layer is extruded, carrying out irradiation crosslinking to melt the inner insulating material and the outer insulating material into a whole; and (3) finishing an insulating layer irradiation crosslinking process by using an AB-2.5MeV high-frequency high-voltage electron accelerator, wherein the high voltage is 2.5MeV, the total flow is 25mA, the beam current is 14mA, the corresponding speed is 26, the linear speed is 38m/min, and large-beam lower wire arrangement is adopted.
10. The method for preparing a multi-core branch cable according to claim 7, wherein the clamping member is made of polytetrafluoroethylene.
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| CN202210117314.4A CN114446518A (en) | 2022-02-08 | 2022-02-08 | Multi-core branch cable and preparation method thereof |
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| CN215680229U (en) * | 2021-08-31 | 2022-01-28 | 广东联讯电缆有限公司 | Environment-friendly communication cable |
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| CN102831968A (en) * | 2012-09-27 | 2012-12-19 | 无锡市恒汇电缆有限公司 | Ratproof termite-proof fireproof multifunctional rubber jacket branch cable and manufacturing method thereof |
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