CN202711748U - Mining 7-core fire-retarding low temperature resistant light-weight signal cable - Google Patents

Abstract

The utility model relates to a mining 7-core fire-retarding low temperature resistant light-weight signal cable, comprising insulating wire cores formed by extruding an insulating layer outside each conductor, a polyester layer, an inner sheath layer, a shielding layer and an outer sheath layer; after being formed into a cable, the seven insulating wire cores are sequentially wrapped with the polyester layer, extruded with the inner sheath layer, woven with the shielding layer, and extruded with the outer sheath layer. The signal cable provided by the utility model has the beneficial effects of low temperature resistance, small external diameter, light weight, good mechanical performance and flame retardancy, flexibility and good shielding effect.

Description

Mining 7-core flame retardant low temperature resistant light signal cable

technical field

The utility model relates to a cable, in particular to a 7-core flame-retardant and low-temperature-resistant light-duty signal cable for mining. The cable is suitable for the control and monitoring circuit and protection circuit of the AC rated voltage u0/u of 450/750V and below, and the connecting line of the electrical instrument in the power distribution installation.

Background technique

With the rapid development of new coal mines, petroleum industry and national defense projects, higher requirements are placed on cables for signal transmission. Cables are developing in the direction of miniaturization, light weight, flame retardancy, and low temperature resistance. Such cables are mostly used in mines Used for signal transmission. General low-temperature-resistant signal cables use polyethylene, polyvinyl chloride and other materials as insulation materials, and the sheaths are mostly armored structures, which cannot be moved. The outer diameter of the product is relatively large, the weight is relatively heavy, and the shielding effect is poor. requirements.

Contents of the invention

In view of the deficiencies in the prior art, the utility model provides a 7-core flame-retardant and low-temperature-resistant light signal cable for mining with small outer diameter, light weight, low-temperature resistance, and good shielding effect.

In order to achieve the above purpose, the utility model adopts the following technical solution: a 7-core flame-retardant and low-temperature-resistant light signal cable for mining, which is characterized in that: it includes an insulating core formed by extruding a layer of insulating layer outside the conductor, poly Ester layer, inner sheath layer, shielding layer, outer sheath layer, the seven insulated wire cores are cabled and wound with a layer of polyester layer, extruded with a layer of inner sheath layer, and braided with a layer of shielding Layer, extrude a layer of outer sheath layer.

The beneficial effects of the utility model are:

1. Low temperature resistance: the cable adopts double-layer sheath, and the inner sheath layer is made of linear low-density polyethylene material. Low temperature flame retardant polyvinyl chloride material, can be used in extremely low temperature places.

2. Small outer diameter and light weight: the thickness of the inner insulating layer is only 0.6mm, and the thickness of the inner sheath layer is only 1.5mm. The density of linear low-density polyethylene material is 0.926g/cm ³ , while that of other polyethylene materials The density is generally 1.43 g/cm ³ , which is about 40% lighter than ordinary cables.

3. Good mechanical properties: LLDPE is a material with high strength and high cutting resistance, which greatly improves the mechanical properties of insulation. The average tensile strength of this material can reach 26Mpa.

4. Good flame retardancy: the inner sheath layer is made of linear low-density polyethylene. The oxygen index of this material can reach 40, which has high flame retardancy. The outer sheath layer is made of flame-retardant PVC sheath, which can Applied in complex high temperature environment.

5. Softness: Since the conductor is made of 0.2mm bare copper wire twisted, the flexibility of the cable is greatly improved, and the cable is easy to lay and install.

6. The shielding effect is good, using 7 strands of 0.2mm copper wire braid as the shielding layer, weaving on a 24-spindle braiding machine, the pitch is 45-46mm, and the shielding effect can reach more than 85%.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, the mine-used 7-core flame-retardant and low-temperature-resistant light signal cable includes an insulating core 1, a polyester layer 2, and an inner sheath layer composed of an insulating layer 1-2 extruded outside the conductor 1-1. 3. Shielding layer 4, outer sheath layer 5, seven insulated wire cores 1 are cabled and wound with a layer of polyester layer 2, extruded a layer of inner sheath layer 3, braided a layer of shielding layer 4, An outer sheath layer 5 is extruded.

The conductor (1-1) is composed of 32 strands of bare copper wire twisted at a pitch of 23.5mm-26mm, and the diameter of each silver-plated copper wire is 0.2mm.

The colors of the insulating layers 1-2 of the seven insulating cores 1 are respectively: blue, orange, green, red, yellow, black and white. The thickness of the insulating layer 1-2 is 0.6 mm, and it is made of low-density polyethylene.

The polyester layer 2 is wrapped with polyester with a thickness of 0.04mm and a width of 25mm, and the covering rate is over 20%.

The inner sheath layer 3 is made of linear low density polyethylene material with a thickness of 1.5mm.

The shielding layer 4 is made of 7 strands of 0.2mm bare copper wires, braided on a 24-spindle braiding machine with a pitch of 45-46mm, and the density is not less than 80%.

The outer sheath layer 5 has a thickness of 1.6mm, and is made of low temperature resistant flame retardant polyvinyl chloride material from +70°C to -40°C.

The utility model can be manufactured through the following process: twist 32 strands of 0.2mm bare copper wires as the conductor 1-1 with a wire and cable stranding machine or a beaming machine, and extrude low-density wires with a high-temperature extruder outside the conductor 1-1 The polyethylene insulating layer 1-2 constitutes the insulated wire core 1, and the seven insulated wire cores 1 are cabled according to the color sequence of blue, orange, green, red, yellow, black, and white on the cable forming machine according to the pitch of 92-108MM After being cabled, a layer of polyester layer 2 is wound outside it, and a layer of inner sheath layer 3 is extruded by a sheath extruder outside the polyester layer 2, and a 24-spindle braiding machine is used outside the inner sheath layer 3 according to Weave 7 strands of 0.2mm bare copper wires with a pitch of 45-46 as the shielding layer 4, and use a high-temperature extruder to extrude a layer of flame-retardant polyvinyl chloride outer sheath layer 5 outside the shielding layer 4.

Claims (5)

1. A 7-core flame-retardant and low-temperature-resistant light signal cable for mining, which is characterized in that it includes an insulating core (1) composed of an insulating layer (1-2) extruded outside the conductor (1-1), poly Ester layer (2), inner sheath layer (3), shielding layer (4), outer sheath layer (5), the seven insulated cores (1) are cabled and wound with a layer of polyester in turn layer (2), extrude a layer of inner sheath (3), braid a layer of shielding layer (4), extrude a layer of outer sheath (5). 2. The 7-core flame-retardant and low-temperature-resistant light-duty signal cable for mining according to claim 1, characterized in that: the conductor (1-1) is composed of 32 strands of bare copper wires twisted, and each silver-plated copper wire The diameter is 0.2mm. 3. The mine-used 7-core flame-retardant and low-temperature-resistant light-duty signal cable according to claim 1, characterized in that: the colors of the insulating layers (1-2) of the seven insulating cores (1) are: blue, orange, Green, red, yellow, black, white colors. 4. The 7-core flame-retardant and low-temperature-resistant light-duty signal cable for mining according to claim 1, characterized in that: the inner sheath layer (3) is made of linear low-density polyethylene. 5. The 7-core flame-retardant and low-temperature-resistant light-duty signal cable for mining according to claim 1, characterized in that: the outer sheath layer (5) is made of +70°C to -40°C low-temperature flame-retardant polyvinyl chloride material .

Images