CN105469860B - A kind of mine power resource line and its production technology - Google Patents

Abstract

The invention relates to a mining power cord and its production process, comprising a conductive wire core, a neutral wire core, a tensile nylon rope, a braided layer of tinned copper wire and steel wire, a flame-retardant refractory layer and a black neoprene outer sheath, The conductive core is composed of stranded copper conductors coated with mineral synthetic mica tape, and the surface of the conductive core is covered with a polytetrafluoroethylene insulating layer. The neutral core includes stranded copper conductors and glass fibers core, and the stranded copper conductor is extruded on the glass fiber core, and the surface of the neutral core is covered with a polytetrafluoroethylene insulating layer; Nylon rope and tinned copper wire and steel wire braided layer are extruded to form a cable core, and the surface of the cable core is extruded with a flame-retardant refractory layer and a black neoprene outer sheath from the inside to the outside. The mining power cord has a simple structural design, low smoke, halogen-free, fire prevention, convenient installation and laying, good flexibility, effective suppression of internal and external electromagnetic interference, and good safety performance.

Description

A mine power cord and its production process

technical field

The invention relates to a power cord and its production process, in particular to a power cord for coal mine operations and its production process.

Background technique

Mine power cords refer to wire and cable products used to supply power to ground equipment and underground equipment used in the coal mining industry. Since the power supply in coal mining areas is the weak link in the power supply system and the working environment is poor, the power cord is a key component to ensure the stable and safe operation of the power supply system, and the requirements for mining power cords are particularly high. Existing mining power cords have wear resistance, poor acid and alkali corrosion resistance, and unsatisfactory flame-retardant and fire-resistant effects during use, and because the softness and mechanical strength of the power cord are not good enough, the power cord often bends and breaks during use Therefore, there is an urgent need for a mining power cord with good electrical performance and long service life to solve the above technical problems.

Contents of the invention

The present invention aims at the defects existing in the existing mine power cord, and provides a mine power cord. The power cord has a simple and compact structure, good flexibility and mechanical tensile strength, a long service life, and greatly enhances the The safe and stable operation performance of the coal mining power supply system; in addition, an easy-to-implement mining power cord production process is proposed to realize mass production and prepare this kind of mine power cord.

In order to achieve the above object, the technical solution adopted by the present invention is a mining power cord, including a conductive wire core, a neutral wire core, a tensile nylon rope, a tinned copper wire steel wire braid, a flame-retardant refractory layer and a black chlorine Butadiene rubber outer sheath, the conductive wire core is composed of stranded copper conductor covered with mineral synthetic mica tape, the surface of the conductive wire core is covered with polytetrafluoroethylene insulation layer, and the neutral wire core includes stranded Copper conductor and glass fiber core, and the stranded copper conductor is extruded on the glass fiber core, and the surface of the neutral core is covered with polytetrafluoroethylene insulation layer; all conductive cores and neutral cores The outer side is covered with tension-resistant nylon rope and tinned copper wire and steel wire braid in turn, and then extruded to form a cable core. The surface of the cable core is extruded with a flame-retardant refractory layer and a black neoprene outer sheath from the inside to the outside.

Wherein, the stranded copper conductor is made of several strands of five types of tinned annealed copper conductors of equal cross-section twisted in a helical arrangement, and the entire copper conductor has good plasticity, mechanical properties, toughness and electrical properties.

In addition, the flame-retardant and refractory layer is formed by extruding and drying low-smoke, halogen-free, flame-retardant polyolefin insulating material. The low-smoke, halogen-free, flame-retardant polyolefin insulating material is composed of the following components by weight: ethylene-vinyl acetate 75 parts of copolymer, 25 parts of high-density polyethylene, 12 parts of maleic anhydride, 8 parts of EPDM rubber, 10 parts of polysiloxane, 22 parts of gas-mixed carbon black, 50 parts of magnesium hydroxide, microencapsulated red 10 parts of phosphorus, 2 parts of antioxidant 1010 and appropriate amount of water.

The production process for preparing the mine power cord comprises the following steps:

(1) Use a wire drawing machine to draw copper wires, and transport the drawn copper wires to an annealing furnace and a copper wire softening tank in turn for processing;

(2) Use a twisting machine to twist the softened copper wire to make a twisted copper conductor. During the twisting process, the twisting distance is controlled at 10-20mm, and the twisting speed is 50-60m/min;

(3) The stranded copper conductor is overlapped and wrapped with two layers of mineral synthetic mica tape through a mica tape wrapping machine, and the overlapping rate is controlled at 50%, and the wrapping angle is controlled at 45-50°;

(4) After drying, polytetrafluoroethylene (PTFE) material is added to the barrel of the fluoroplastic extruder for plasticization and melting, and the PTFE melt is extruded into the head mold through the screw in the barrel, Use a constant tension pay-off device to pull out the copper wire core wrapped with mica tape as a refractory layer and pass through the head mold of the fluoroplastic extruder. After passing through the head mold, the copper wire core is covered with PTFE material and becomes a core wire. The wire passes through the active warm water cooling tank and the cold water cooling rotary box with the temperature controlled at 40-60°C in turn, and then is dried by the blower dryer. The dried core wires are inspected online, and sent to the high-frequency spark testing machine for testing through the constant tension traction device. The core wires that pass the test pass through the wire storage frame, the wire meter meter and the double-axis winding and take-up machine in turn. Take-up storage;

(5) All conductive wire cores and neutral wire cores are bundled into cables using a wire harness machine, and the outside of the cabled cores is sequentially coated with tensile nylon rope and tinned copper wire steel wire braid to form a cable core;

(6) Add the pre-prepared low-smoke flame-retardant polyolefin insulation material to the barrel of the single-screw extruder after drying, and then plasticize and melt it, and extrude the melt into the machine head through the screw in the barrel In the mould, the cable core is pulled by a constant tension pay-off device and passed through the head die of the single-screw extruder, extruded through the head die to make the low-smoke flame-retardant polyolefin insulating material coated on the outside of the cable core. The cable core covered with flame-retardant and refractory layer is cooled by the movable temperature-controlled cooling water tank and the fixed cold-water cooling rotary box in turn, and then dried by the blower dryer, and the eccentricity detector and high-voltage detector are used for online detection;

(7) The dried cable core is coated with a black neoprene outer sheath to make a mine power cord, and the mine power cord is tested online. Wire meter counter and double-shaft take-up and take-up machine for wire take-up and storage.

Compared with the prior art, the advantages of the present invention are as follows: the mining power cord has a simple structural design, low smoke, halogen-free, fireproof, convenient installation and laying, good flexibility, and effectively suppresses internal and external electromagnetic interference. The neutral wire core is easy to identify, and the safety performance is good; the production process is convenient to operate, the production cost is low, and the economic benefit is good. The attached refractory layer has excellent fire resistance, and the power cord uses PTFE material as the insulation layer of the copper wire to make the core wire, which has high temperature resistance, anti-corrosion and anti-sticking properties, which can effectively prevent the power cord from self-heating during use. And the phenomenon of fire, effectively enhance the flame retardant ability of the power cord.

Description of drawings

Fig. 1 is a schematic structural diagram of the mine power cord proposed by the present invention.

In the figure: 1-conductive core, 2-neutral core, 3-stranded copper conductor, 4-glass fiber core, 5-mineral synthetic mica tape, 6-polytetrafluoroethylene insulation layer, 7-tensile nylon Rope and tinned copper wire steel wire braid, 8-flame retardant refractory layer, 9-black neoprene outer sheath.

detailed description

In order to deepen the understanding and recognition of the present invention, the present invention will be further described and introduced below in conjunction with the accompanying drawings.

As shown in Figure 1, a mining power cord includes three conductive wire cores 1, a neutral wire core 2, tensile nylon rope, tinned copper wire steel wire braid, flame-retardant refractory layer 8 and black neoprene The rubber outer sheath 9, the conductive wire core 1 is composed of a stranded copper conductor 3 coated with a mineral synthetic mica tape 5, and the surface of the conductive wire core 1 is coated with a polytetrafluoroethylene insulating layer 6, and the middle The neutral core 2 includes a stranded copper conductor 3 and a glass fiber core 4, and the stranded copper conductor 3 is extruded on the glass fiber core 4, and the surface of the neutral core 2 is coated with a polytetrafluoroethylene insulating layer 6. The outer sides of all conductive cores 1 and neutral cores 2 are coated with tension-resistant nylon rope and tinned copper wire and steel wire braid layer 7 in turn, and then extruded into a cable core. The surface of the cable core is extruded from the inside to the outside with Flame retardant refractory layer 8 and black neoprene outer sheath 9. The stranded copper conductor 3 is made of several strands of five types of tinned annealed copper conductors of equal cross-section twisted in a helical arrangement, and the entire copper conductor has good plasticity, mechanical properties, toughness and electrical properties.

In addition, the flame-retardant and refractory layer 8 is formed by extruding and drying low-smoke, halogen-free, flame-retardant polyolefin insulating material. The low-smoke, halogen-free, flame-retardant polyolefin insulating material is composed of the following components by weight: ethylene-acetic acid 75 parts of ethylene copolymer, 25 parts of high-density polyethylene, 12 parts of maleic anhydride, 8 parts of EPDM rubber, 10 parts of polysiloxane, 22 parts of gas-mixed carbon black, 50 parts of magnesium hydroxide, microencapsulation 10 parts of red phosphorus, 2 parts of antioxidant 1010 and appropriate amount of water.

The production process for preparing the mine power cord comprises the following steps:

(1) Use a wire drawing machine to draw copper wires, and transport the drawn copper wires to an annealing furnace and a copper wire softening tank in turn for processing;

(2) adopt stranding machine to twist the copper wire through softening treatment to make twisted copper conductor 3, in the twisting process, twist distance is controlled at 10-20mm, and the speed of twisted wire is 50-60m/min;

(3) The stranded copper conductor 3 is overlapped and wrapped with two layers of mineral synthetic mica tapes 5 through a mica tape wrapping machine, and the overlapping rate is controlled at 50%, and the wrapping angle is controlled at 45-50°;

(4) After drying, polytetrafluoroethylene (PTFE) material is added to the barrel of the fluoroplastic extruder for plasticization and melting, and the PTFE melt is extruded into the head mold through the screw in the barrel, Use a constant tension pay-off device to pull out the copper wire core wrapped with mica tape as a refractory layer and pass through the head mold of the fluoroplastic extruder. After passing through the head mold, the copper wire core is covered with PTFE material and becomes a core wire. The wire passes through the active warm water cooling tank and the cold water cooling rotary box with the temperature controlled at 40-60°C in turn, and then is dried by the blower dryer. The dried core wires are inspected online, and sent to the high-frequency spark testing machine for testing through the constant tension traction device. The core wires that pass the test pass through the wire storage frame, the wire meter meter and the double-axis winding and take-up machine in turn. Take-up storage;

(5) All conductive wire cores 1 and neutral wire cores 2 are bundled into cables using a wire harness machine, and the outside of the cabled cores is coated with tensile nylon rope and tinned copper wire steel wire braid layer 7 to form a cable core;

(6) Add the pre-prepared low-smoke flame-retardant polyolefin insulation material to the barrel of the single-screw extruder after drying, and then plasticize and melt it, and extrude the melt into the machine head through the screw in the barrel In the mould, the cable core is pulled by a constant tension pay-off device and passed through the head die of the single-screw extruder, extruded through the head die to make the low-smoke flame-retardant polyolefin insulating material coated on the outside of the cable core. The cable core coated with flame-retardant and refractory layer 8 is cooled by the movable temperature-controlled cooling water tank and the fixed cold-water cooling rotary box in turn, and then dried by the blower dryer, and the eccentricity detector and high-voltage detector are used for online detection;

(7) After the dried cable core is coated with a black neoprene outer sheath 9, it is made into a mine power cord, and the mine power cord is tested online, and the qualified power cord passes through the wire storage rack, Take-up meter and double-axis take-up and take-up machine for take-up and storage.

It should be noted that the above-mentioned embodiments are not used to limit the protection scope of the present invention, and equivalent transformations or substitutions made on the basis of the above-mentioned technical solutions all fall within the protection scope of the claims of the present invention. In the claims, the word "comprising" does not exclude the presence of elements or steps not listed in the claims.

Claims (1)

1. a kind of mine power resource line, it is characterised in that：Including conductor wire core, neutral core, tension nylon rope, tinned copper wire steel wire Braiding layer, flame-retardant layer and black Neoprene rubber oversheath, the conductor wire core are stranded by mineral synthetic mica tape cladding Copper conductor is constituted, and has teflon insulation layer in the conductor wire core Surface coating, and the neutral core is led including stranded copper Body and fiber glass core, and twisted copper conductors are extruded on fiber glass core, have poly- in the Surface coating of the neutral core Tetrafluoroethene insulating barrier；The outside of all conductor wire cores and neutral core coats tension nylon rope successively and tinned copper wire steel wire is compiled Cable core is extruded into after tissue layer, flame-retardant layer and black Neoprene rubber oversheath is extruded with from inside to outside on the surface of cable core；Institute The tin plating soft copper wire of prismatic five class of carried interest is used to be made by twisting according to helical arrangement if stating twisted copper conductors, it is described fire-retardant resistance to Fire bed using low smoke halogen-free flame-retardant polyolefin Insulation Material extrusion drying form, the low smoke halogen-free flame-retardant polyolefin Insulation Material be by with The component composition of lower parts by weight：75 parts of ethylene-vinyl acetate copolymer, 25 parts of high density polyethylene (HDPE), 12 parts of maleic anhydride, ternary 8 parts of EP rubbers, 10 parts of polysiloxanes, 22 parts of mixed gas carbon black, 50 parts of magnesium hydroxide, 10 parts of microencapsulated powder oil, antioxidant 1010 2 parts and appropriate amount of water；

The production technology for preparing above-mentioned mine power resource line comprises the following steps：

(1) copper cash is drawn using wire drawing machine, the copper cash drawn is delivered in annealing furnace and copper cash softening tank successively and located Reason；

(2) stranded making twisted copper conductors will be carried out by the copper cash of sofening treatment using wire twisting machine, twisted to during, lay Control is in 10-20mm, and the speed of twisted wire is 50-60m/min；

(3) it is twisted copper conductors are overlapping around mineral synthetic mica tape of double-baging by Mica tape machine, and by Duplication control 50%, wrapping angle is controlled at 45-50 °；

(4) polytetrafluoroethylene (PTFE) (PTFE) material is added to after drying in the machine barrel of fluorine modeling extruder and carries out plastifying fusion, And PTFE melts are squeezed into extrusion die by the screw rod in machine barrel, pulled out using identical tension actinobacillus device and be wound with mica tape The extrusion die of extruder is moulded by fluorine as the copper core of flame retardant coating, copper core is by after PTFE material claddings after extrusion die As cored wire, cored wire is sequentially passed through into temperature control in 40-60 DEG C of movable warm water cooling bath and cold water and cools back turnning box cooling Dried again by blowing-dryer afterwards, using capacitance detecting instrument, core line diameter detector, concentricity meter, eccentric inspection in water Survey instrument and on-line checking is carried out to dried cored wire, and high-frequency spark testing machine is delivered to by identical tension draw-gear and surveyed Try, qualified cored wire sequentially passes through storage rack, take-up meter counter and twin shaft and batches admission machine progress take-up storage after testing；

(5) all conductor wire cores and neutral core are subjected to wire harness stranding using wire harness machine, and on the outside of the core after stranding according to Secondary cladding tension nylon rope and tinned copper wire steel wire braid formation cable core；

(6) low-smoke flame-proof polyolefin Insulation Material well prepared in advance is added in the machine barrel of single screw extrusion machine after drying Plastifying fusion is carried out, and melt is squeezed into extrusion die by the screw rod in machine barrel, using identical tension actinobacillus device to cable Core is drawn and by the extrusion die of single screw extrusion machine, is extruded by extrusion die and cause low-smoke flame-proof polyolefin insulation Material is coated on the outside of cable core, and the cable core for being coated with flame-retardant layer is sequentially passed through into movable temperature control cooling water groove and fixed cold water Cool back and dried again by blowing-dryer after turnning box cooling, it is examined online using eccentricity detecting instrument, High-pressure measurement Instrument Survey；

(7) mine power resource line will be made after dry cable core coats black Neoprene rubber oversheath, and to the mine power resource Line carries out on-line checking, and qualified power line, which sequentially passes through storage rack, take-up meter counter and twin shaft and batches admission machine, after testing enters Row take-up is deposited.