Light environment-friendly direct-current oil-impregnated paper mining cable

Abstract

The utility model discloses a light environment-friendly direct-current oil-impregnated paper mining cable, which comprises a circular cable core formed by twisting three oil-impregnated paper insulating wire cores and jute filling media together, an oil-impregnated paper composite resin tape wrapping layer, an aluminum alloy sheath layer, a polyester fiber non-woven fabric inner cushion layer, a stainless steel wire armor layer, a polyester fiber non-woven fabric outer cushion layer and an irradiation crosslinking high-density polyethylene outer sheath are sequentially wrapped outside the circular cable core, and each oil-impregnated paper insulating wire core comprises a fan-shaped copper conductor and an oil-impregnated paper insulating layer. The oil-impregnated paper composite resin tape wrapping layer is of an oil-impregnated paper composite resin tape lapping and wrapping structure, the oil-impregnated paper composite resin tape is formed by jointly compounding a polyolefin resin film in the middle and kraft paper on the two sides, and the outer diameter of the irradiation crosslinking high-density polyethylene outer sheath is 47mm to 85mm. The mining cable realizes light weight preparation, is reliable in electrical insulation performance under high voltage, is green and environment-friendly, and does not pollute the natural environment.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a lightweight and environment-friendly DC oil-impregnated paper mining cable. Background Art

[0002] Mining cables refer to wires and cables used in surface and underground equipment in the coal mining industry. These include cables for coal mining machines, conveyors, communications, lighting, and signaling equipment, as well as cables for electric drills, cap lamps, and power cables for underground mobile substations. Electricity is the primary energy source for coal mining. Providing reliable, safe, and cost-effective power supply to underground coal mines is crucial for improving product quality, increasing economic efficiency, and ensuring safe production. However, the high-voltage power supply used is 10kV or 6kV, which is used as a standard high-voltage feeder under fixed conditions. If a fire occurs, it will produce large amounts of smoke, toxic gases, and corrosive gases, especially chlorine, posing a significant safety hazard. The cables can also contaminate soil and water sources during use and disposal. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a lightweight and environmentally friendly DC oil-impregnated paper mining cable in response to the deficiencies in the existing technology, which realizes lightweight preparation, reliable electrical insulation performance under high voltage, is green and environmentally friendly, and does not pollute the natural environment.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] The lightweight and environmentally friendly DC oil-impregnated paper mining cable includes three oil-impregnated paper insulated cores and a jute filling medium twisted together to form a circular cable core. The outside of the circular cable core is sequentially coated with an oil-impregnated paper composite resin tape wrapping layer, an aluminum alloy sheath layer, a polyester fiber non-woven fabric inner padding layer, a stainless steel wire armor layer, a polyester fiber non-woven fabric outer padding layer and an irradiation cross-linked high-density polyethylene outer sheath. The oil-impregnated paper insulated core includes a fan-shaped copper conductor and an oil-impregnated paper insulation layer. The fan-shaped copper conductor is a multiple strands of tightly twisted fan-shaped conductor, and the strands are composed of multiple tinned copper monofilaments. The oil-impregnated paper of the oil-impregnated paper insulation layer is a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on both sides. The oil-impregnated paper composite resin tape wrapping layer is an oil-impregnated paper composite resin tape overlapping wrapping structure. The oil-impregnated paper composite resin tape is a composite of polyolefin resin film in the middle and kraft paper on both sides. The outer diameter of the irradiation cross-linked high-density polyethylene outer sheath is 47mm to 85mm.

[0006] Preferably, the polyolefin resin film is LDPE, MDPE or HDPE resin film.

[0007] Preferably, the thickness of the oil-impregnated paper composite resin tape is 0.1 mm to 0.3 mm.

[0008] Preferably, the oil-impregnated paper composite resin tape wrapping layer has a thickness of 1 mm to 3 mm.

[0009] Preferably, the strand direction of the strands is opposite to that of the tinned copper monofilaments.

[0010] Preferably, the lay length of the tinned copper monofilament is 15 to 30 times the outer diameter of the tinned copper monofilament, and the lay length of the strands is 10 to 20 times the outer diameter of the strands.

[0011] Preferably, the inner polyester fiber non-woven fabric pad layer and the outer polyester fiber non-woven fabric pad layer are both polyester fiber non-woven fabric unidirectional spiral overlapping wrapped structures with opposite winding directions.

[0012] Preferably, the thickness of the aluminum alloy sheath layer is 1 mm to 3 mm.

[0013] Preferably, the stainless steel wire armor layer is a single-layer stainless steel wire armor structure, and the diameter of the stainless steel wire is 2 mm to 3 mm.

[0014] Preferably, the thickness of the radiation cross-linked high-density polyethylene outer sheath is 2.2 mm to 3.5 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. The aluminum alloy sheath replaces the original lead sheath, which reduces the thickness while avoiding the use of lead elements, reducing the harm of lead elements to the human body, which is beneficial to environmental protection and realizing the lightweight preparation of the cable. The cable as a whole meets the requirements of environmentally friendly cables and meets the design of low-smoke halogen-free cables for mining. It does not contain substances harmful to human health. The cable does not release smoke or toxic gases in the burning flame, effectively protecting the atmospheric environment. The discarded cables can be recycled and reused, without pollution to the environment, which is beneficial to environmental protection and renewable treatment.

[0017] 2. By adding a polyester fiber non-woven fabric inner pad between the aluminum alloy sheath layer and the stainless steel wire armor layer, direct contact friction is prevented, which damages the aluminum alloy sheath layer, reduces stress concentration in the aluminum alloy sheath layer, prevents cracking, and improves flexibility and bending resistance. A polyester fiber non-woven fabric outer pad is added between the stainless steel wire armor layer and the irradiated cross-linked high-density polyethylene outer sheath to protect the outer sheath, prevent damage and cracking, and ensure the excellent electrical properties of the cable.

[0018] 3. Three fan-shaped oil-impregnated paper insulated cores replace the original round insulated cores, and the cable core is wrapped with oil-impregnated paper composite resin tape, which helps to ensure the electrical insulation properties of the cable under high voltage, improve reliability and extend service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present utility model.

[0020] In the figure: 1- oil-impregnated paper insulated core, 2- jute filling medium, 3- oil-impregnated paper composite resin tape wrapping layer, 4- aluminum alloy sheath layer, 5- polyester fiber non-woven fabric inner padding layer, 6- stainless steel wire armor layer, 7- polyester fiber non-woven fabric outer padding layer, 8- irradiation cross-linked high-density polyethylene outer sheath, 9- sector-shaped copper conductor, 10- oil-impregnated paper insulation layer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1 As shown, the lightweight, environmentally friendly DC oil-impregnated paper mining cable according to an embodiment of the present invention comprises three oil-impregnated paper insulated cores 1 twisted together with a jute filling medium 2 to form a circular cable core. The oil-impregnated paper insulated core 1 comprises a sector-shaped copper conductor 9 and an oil-impregnated paper insulation layer 10. The sector-shaped copper conductor 9 is a compact sector-shaped conductor consisting of a plurality of strands twisted together. The strands are composed of a plurality of tinned copper monofilaments twisted together. Furthermore, the lay length of the tinned copper monofilaments is 15 to 30 times the outer diameter of the tinned copper monofilaments, and the lay length of the strands is 10 to 20 times the outer diameter of the strands. The strand lay direction is opposite to that of the tinned copper monofilaments. The oil-impregnated paper of the oil-impregnated paper insulation layer 10 is a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on both sides.

[0023] The exterior of the circular cable core is sequentially coated with an oil-impregnated paper composite resin tape wrapping layer 3, an aluminum alloy sheath layer 4, a polyester fiber non-woven fabric inner padding layer 5, a stainless steel wire armor layer 6, a polyester fiber non-woven fabric outer padding layer 7, and an irradiated cross-linked high-density polyethylene outer sheath 8. The oil-impregnated paper composite resin tape wrapping layer 3 is an oil-impregnated paper composite resin tape overlapped wrapping structure, and the oil-impregnated paper composite resin tape is formed by combining a polyolefin resin film in the middle and kraft paper on both sides. Specifically, the polyolefin resin film is LDPE, MDPE, or HDPE resin film. The thickness of the oil-impregnated paper composite resin tape is 0.1 mm to 0.3 mm. The thickness of the oil-impregnated paper composite resin tape wrapping layer 3 is 1 mm to 3 mm. The thickness of the aluminum alloy sheath layer 4 is 1 mm to 3 mm. In one embodiment, the polyester fiber non-woven fabric inner padding layer 5 and the polyester fiber non-woven fabric outer padding layer 7 are both polyester fiber non-woven fabric unidirectional spiral overlapping wrapping structures, with the winding directions being opposite. In one embodiment, the stainless steel wire armor layer 6 is a single-layer stainless steel wire armor structure, and the stainless steel wire diameter is 2 mm to 3 mm. The thickness of the radiation-crosslinked high-density polyethylene outer sheath 8 is 2.2 mm to 3.5 mm. The outer diameter of the radiation-crosslinked high-density polyethylene outer sheath 8 is 47 mm to 85 mm.

[0024] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. Lightweight and environmentally friendly DC oil-impregnated paper mining cable, its characteristics are: The invention comprises three oil-impregnated paper insulated wire cores (1) and a jute filling medium (2) twisted together to form a circular cable core, wherein the circular cable core is coated with an oil-impregnated paper composite resin tape wrapping layer (3), an aluminum alloy sheath layer (4), a polyester fiber non-woven fabric inner padding layer (5), a stainless steel wire armor layer (6), a polyester fiber non-woven fabric outer padding layer (7) and an irradiated cross-linked high-density polyethylene outer sheath (8) in sequence, and the oil-impregnated paper insulated wire core (1) comprises a fan-shaped copper conductor (9) and an oil-impregnated paper insulation layer (10), wherein the fan-shaped copper conductor (9) is A plurality of strands are twisted and compressed into a fan-shaped conductor, wherein the strands are formed by twisting a plurality of tinned copper monofilaments, the oil-impregnated paper of the oil-impregnated paper insulation layer (10) is a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on both sides, the oil-impregnated paper composite resin tape wrapping layer (3) is an oil-impregnated paper composite resin tape overlapping wrapping structure, the oil-impregnated paper composite resin tape is formed by compositely forming a polyolefin resin film in the middle and kraft paper on both sides, and the outer diameter of the irradiated cross-linked high-density polyethylene outer sheath (8) is 47mm to 85mm.

2. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The polyolefin resin film is LDPE, MDPE or HDPE resin film.

3. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The thickness of the oil-impregnated paper composite resin tape is 0.1 mm to 0.3 mm.

4. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The thickness of the oil-impregnated paper composite resin tape wrapping layer (3) is 1 mm to 3 mm.

5. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The strand lay direction is opposite to that of the tinned copper monofilaments.

6. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The lay length of the tinned copper monofilament is 15 to 30 times the outer diameter of the tinned copper monofilament, and the lay length of the strands is 10 to 20 times the outer diameter of the strands.

7. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The polyester fiber non-woven fabric inner pad layer (5) and the polyester fiber non-woven fabric outer pad layer (7) are both polyester fiber non-woven fabric unidirectional spiral overlapping wrapped structures with opposite winding directions.

8. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The thickness of the aluminum alloy sheath layer (4) is 1 mm to 3 mm.

9. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The stainless steel wire armor layer (6) is a single-layer stainless steel wire armor structure, and the diameter of the stainless steel wire is 2 mm to 3 mm.

10. The lightweight and environmentally friendly DC oil-impregnated paper mining cable according to claim 1 is characterized by: The thickness of the radiation cross-linked high-density polyethylene outer sheath (8) is 2.2 mm to 3.5 mm.

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