CN201508721U - A flame-retardant communication cable for coal mines - Google Patents

Abstract

A flame-retardant communication cable for coal mines, which is characterized in that the conductor is tinned annealed copper wire, and a silane cross-linked polyethylene insulating layer is extruded on the conductor and vulcanized to form an insulated wire core; every two or four insulated wires Twisted into a pair or four-star group, and the polyester tape is overlapped on the pair or four-star group to form a unit pair or a unit four-star group, and the unit pair or unit four-star The group and the filling rope are cabled to form a cable core, and the outer surface of the cable core is sequentially arranged from the inside to the outside to form a wrapping tape layer, a total shielding layer composed of an aluminum/plastic composite tape layer wrapped around the general shielding drainage line, and an extruded wrapping layer. The inner sheath layer formed by PE, the galvanized steel wire braided armor layer, and the outer sheath layer formed by extruding PVC/NBR composite elastomer material. The utility model has dual functions of signal transmission and electric energy transmission, and has the advantages of anti-electromagnetic interference, flame retardant, bending resistance, mechanical shock resistance and long life.

Description

A flame-retardant communication cable for coal mines

technical field

The utility model relates to a communication cable, in particular to a novel flame-retardant communication cable for coal mines, which belongs to the technical field of electric wires and cables.

Background technique

Coal mining industry, due to the particularity of its environment, requires certain special requirements for cables used in electrical equipment. According to the harsh conditions of the coal mine environment, the required cables have properties such as flame retardancy, external mechanical impact resistance, abrasion resistance, tensile strength and softness. Coal mine communication cables also need to have anti-electromagnetic interference and other requirements.

At present, most of these cables in the market use polyethylene insulation, which has low heat resistance; the sheath is made of PVC plastic, and the resistance to external mechanical impact is not ideal. Therefore, it is necessary to make necessary improvements to the existing products to improve their performance, prolong the service life of the products, and meet the requirements of users.

Contents of the invention

The utility model provides an improved flame-retardant communication cable for coal mines in order to avoid the disadvantages of the above-mentioned prior art.

The utility model solves the technical problem and adopts the following technical solutions:

The structural feature of the utility model flame-retardant communication cable for coal mines is that the conductor adopts tin-plated annealed copper wire, and the conductor is extruded with silane cross-linked polyethylene insulating layer and vulcanized to form an insulating core; every two insulating cores are twisted into a pair Twisted groups or every four insulated wire cores are twisted into a four-star group, and polyester tapes are overlapped on the twisted group or four-star group to form a unit pair group or a unit four-star group, and the unit pair twisted Groups or unit four-star groups and filling ropes are cabled to form a cable core, and the outer surface of the cable core is sequentially provided with a wrapping tape layer formed by wrapping from the inside to the outside, and a wrapping aluminum-plastic composite tape layer is formed on the general shielding drainage line. The overall shielding layer, the inner sheath layer formed by extruded PE, the galvanized steel wire braided armor layer, and the outer sheath layer formed by extruded PVC/NBR composite elastomer material.

The structural features of the flame-retardant communication cable for coal mines of the utility model also lie in:

The conductor adopts 7 regular twisted structures.

The twisting pitch of the pair twisted group is 100-120; the pitch of the four-star group is 130-150.

The oxygen index of the PVC/NBR composite elastomer material used in the outer sheath layer is not less than 32.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

1. The insulation layer of the utility model adopts silane cross-linked polyethylene material with excellent electrical properties and high mechanical properties. The material is easy to obtain, easy to process, and the most cost-effective. Its regular working temperature reaches 90°C, and the product has good heat resistance;

2. The overall shielding layer in the utility model adopts aluminum-plastic composite tape, on the one hand, it is used as a metal shielding layer, and on the other hand, it can form a waterproof layer together with the PE inner sheath layer, so as to prevent the insulation resistance of the insulating wire core from absorbing water;

3. The outer sheath layer of the cable of the utility model adopts PVC/NBR composite elastomer material, which has high wear resistance, oil resistance, chemical resistance, weather resistance, mechanical impact resistance, tear resistance, high flame retardancy, high strength, high Elasticity, high elongation, easy processing, etc.;

4. The conductor in the utility model adopts a normal twisted structure of 7 copper wires, the surface of the conductor is smooth, the bending performance is excellent, and the flexibility of the cable is improved.

Description of drawings

Fig. 1 is a structural schematic diagram of seven groups of twisted cores in the utility model.

Fig. 2 is a structural schematic diagram of seven groups of star stranded cores in the utility model.

Symbols in the figure: 1 conductor, 2 insulating layer, 3A twisted group, 3B four-star group, 4 polyester tape, 5A unit twisted group, 5B unit four-star group, 6 filling rope, 7 tape layer, 8 drainage wire , 9 aluminum-plastic composite tape, 10 inner household layer, 11 armor layer, 12 outer sheath layer.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Detailed ways

Referring to Fig. 1 and Fig. 2, in this embodiment, there are seven pairs/star-quad communication cables, the conductor 1 is made of tinned annealed copper wire, and the silane cross-linked polyethylene insulating layer 2 is extruded on the conductor and vulcanized to form an insulated wire core, every two insulated cores are twisted into a pair group 3A, or every four insulated cores are twisted into a four-star group 3B, and a polyester tape 4 is overlapped on the pair group 3A or four-star group 3B, and In this way, the unit pair twist group 5A or the unit four-star group 5B is formed, and the unit pair twist group 5A or the unit four-star group 5B is cabled with the filling rope 6 to form a cable core, and the outer surface of the cable core is sequentially arranged from the inside to the outside. The formed tape layer 7, the general shielding layer formed by wrapping the aluminum-plastic composite tape layer 9 on the general shielding drain wire 8, the extruded PE inner sheath layer 10, the galvanized steel wire braided armor layer 11, the extruded PVC/NBR composite An outer sheath layer 12 of elastomeric material.

In the specific implementation, the conductor adopts the regular conductor structure of 7 tinned annealed copper wires, the twisted pitch of the twisted pair group 3A is 100-120; the pitch of the four-star group 3B is 130-150, and the sheath layer 12 adopts PVC/NBR The oxygen index of the composite elastomer material is not less than 32.

Claims (4)

1. a colliery flame-retardant communication cable is characterized in that conductor (1) adopts tin annealed copper wire, extrudes organosilane crosslinked polyethylene insulating barrier (2) and constitute insulated wire cores through sulfuration on described conductor (1); Per two eradication edge cores are twisted into pair twist group (3A) or per four eradication edge cores are twisted into four stars group (3B), go up the overlapping polyester belt (4) that is surrounded with in described pair twist group (3A) or four stars group (3B), constitute unit pair twist group (5A) or unit four stars group (5B), described unit pair twist group (5A) or unit four stars group (5B) constitute cable core with gasket for packing (6) stranding, set gradually the belting layer (7) of wrapped formation from inside to outside at the outer surface of described cable core, total shielding drainage thread (8) is gone up total screen that wrapped plastic-aluminum combined belt (9) constitutes, extrude the sheath (10) that PE forms, zinc-coated wire braiding armour (11), extrude the external sheath layer (12) that PVC/NBR composite elastic body material forms.

2. a kind of colliery according to claim 1 flame-retardant communication cable is characterized in that described conductor (1) adopts 7 regular lay configuration.

3. a kind of colliery according to claim 1 flame-retardant communication cable is characterized in that described pair twist group (3A) twisting pitch is 100-120; Described four stars group (3B) pitch is 130-150.

4. a kind of colliery according to claim 1 flame-retardant communication cable is characterized in that the PVC/NBR composite elastic body material oxygen index that described external sheath layer (12) adopts is not less than 32.

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