Moistureproof and durable large-section movable metal shielding mining flexible cable

Abstract

The utility model discloses a moistureproof durable large-section mobile metal shielding mining flexible cable comprising three power wire cores which are uniformly distributed at intervals of 120 degrees in the circumferential direction through a Y-shaped polyurethane elastomer isolation core, and the free ends of three forked separator plates of the Y-shaped polyurethane elastomer isolation core extend towards the outer side in an external expansion manner to form fan-shaped parts. A longitudinal hole is formed in each fan-shaped part, the monitoring wire core and the two control wire cores are arranged in the three longitudinal holes in a sleeved mode at intervals, a center hole is formed in the center of the Y-shaped polyurethane elastomer isolation core, and an auxiliary ground wire is arranged in the center hole in a sleeved mode at intervals. And the Y-shaped polyurethane elastomer isolation core is sequentially coated with a double-layer polyethylene longitudinally-wrapped water-blocking isolation layer, a CPE extruded inner sheath, an AFRP reinforced woven tensile layer, a CPE extruded outer sheath and an EVA wear-resistant protection layer. The cabling cable core of the flexible cable is round and balanced, the wear resistance of the sheath is better, the sheath can be protected from cracking, the moisture-proof and water-blocking performance is excellent, and the durable usability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a moisture-proof, durable, large-section mobile metal shielded soft cable for mining. Background Art

[0002] Mining cables are used in mines for various voltage levels, electrical equipment, mining machinery, and other applications. High-power coal mining cables are typically used to connect transformers to underground electrical equipment. These cables feature large cross-sections, complex structures, and numerous cores, making them challenging to lay. The cores are prone to deformation, and defects such as serpentine, loose strands, and skipped strands are common. Furthermore, the continuous movement of the equipment can easily cause the cable sheath to wear and crack. Prolonged operation in humid environments can result in poor moisture and water resistance, making them less durable. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a moisture-proof and durable large-section mobile metal shielded soft cable for mining. The cable core is round and balanced, which prevents the cable core from having quality defects such as serpentine, loose strands and skipped strands. The outer skin has better wear resistance, which helps to prevent the outer skin from cracking. It has excellent moisture-proof and water-resistant properties and better durability.

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

[0005] The moisture-proof and durable large-section mobile metal shielded soft cable for mining comprises three power cores uniformly spaced 120 degrees around a Y-shaped polyurethane elastomer isolation core. The free ends of the three bifurcated partitions of the Y-shaped polyurethane elastomer isolation core extend outward to form a fan-shaped portion. Each fan-shaped portion is provided with a longitudinal hole. A monitoring core and two control cores are respectively sleeved in the three longitudinal holes. A central hole is provided in the center of the Y-shaped polyurethane elastomer isolation core. An auxiliary ground wire is sleeved in the gap in the central hole. The longitudinal holes and the gaps in the central hole are filled with petroleum jelly. The Y-shaped polyurethane elastomer isolation core is provided with a central hole. The outside of the polyurethane elastomer isolation core is sequentially coated with a double-layer polyethylene longitudinally wrapped water-blocking isolation layer, a CPE extruded inner sheath, an AFRP reinforced braided tensile layer, a CPE extruded outer sheath and an EVA wear-resistant protective layer. Petroleum jelly is filled between the Y-shaped polyurethane elastomer isolation core and the double-layer polyethylene longitudinally wrapped water-blocking isolation layer. The power line core includes a power line core conductor, a semi-conductive nylon water-blocking inner coating layer, a polyvinyl chloride insulation layer, a semi-conductive nylon water-blocking outer coating layer and a first copper wire braided shielding layer. The auxiliary ground wire is a bare copper wire, and the outer diameter of the EVA wear-resistant protective layer is 80mm to 90mm.

[0006] Preferably, the power line core conductor is composed of several tinned copper monofilaments with a diameter of 0.08mm to 0.3mm concentrically twisted, and the first copper wire braided shielding layer is composed of a para-type wholly aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire, which are woven in a counter-rotating spiral. The diameter of the para-type wholly aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

[0007] Preferably, the control core comprises a control core conductor and a polypropylene insulation layer, and the control core conductor is composed of a number of tinned copper monofilaments with a diameter of 0.05mm to 0.1mm concentrically twisted together.

[0008] Preferably, the auxiliary ground wire is a plurality of soft copper wires with a diameter of 0.1 mm to 0.2 mm twisted and pressed into a circular conductor structure.

[0009] Preferably, the monitoring core includes a monitoring core conductor, an XLPE insulation layer, a PET resin wrapping layer and a second copper wire braided shielding layer.

[0010] Preferably, the monitoring line core conductor is composed of several tinned copper monofilaments with a diameter of 0.02mm to 0.04mm concentrically twisted, and the second copper wire braided shielding layer is composed of a para-type wholly aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire, which are woven in a counter-rotating spiral. The diameter of the para-type wholly aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

[0011] Preferably, the double-layer polyethylene longitudinally wrapped water-blocking isolation layer is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 25% to 40%, and the double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer.

[0012] Preferably, the AFRP reinforced braided tensile layer is a braided structure in which inner and outer double layers of aramid strands are spirally wound in opposite directions.

[0013] Preferably, the outer surface of the CPE extruded inner sheath and the inner surface of the CPE extruded outer sheath are both provided with an EVA water-blocking adhesive layer.

[0014] Preferably, the EVA wear-resistant protective layer has a thickness of 0.1 mm to 0.3 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. The Y-shaped polyurethane elastomer isolation core is used to isolate and evenly distribute three power cores, one monitoring core, two control cores and one auxiliary ground wire, forming an effective electrical insulation distance and ensuring mechanical strength. The cable core structure is round, balanced and stable. In addition, after the double-layer polyethylene water-blocking tape is longitudinally overlapped and wrapped to form an isolation layer, the CPE is extruded into an inner sheath. The isolation layer is flat and compact, with an overlap rate of 25% to 40%, better flexibility and bending resistance, and effectively prevents the cable core from serpentine, loose strands, and jumping strands, ensuring stable and reliable electrical characteristics and better durability.

[0017] 2. Adding a semi-conductive nylon water-blocking coating to both the inner and outer sides of the power cable core insulation layer helps prevent moisture from diffusing into the insulation layer, delaying the occurrence of water tree aging in the insulation layer, providing excellent moisture-proof and water-blocking properties and improving durability. Filling the longitudinal holes, center hole gaps, and cable core gaps with petroleum jelly helps prevent longitudinal water seepage. Adding a double-layer polyethylene longitudinal water-blocking isolation layer to the outside of the cable core enhances moisture-proof and water-blocking properties, preventing water vapor from invading from the outside. Adding an EVA water-blocking adhesive layer to the inner and outer CPE extruded sheaths enhances water vapor diffusion resistance and bonds the inner and outer sheaths to the AFRP reinforced braided tensile layer to improve sheath strength. Coating the CPE extruded outer sheath with an EVA wear-resistant protective layer effectively improves the wear resistance of the cable sheath, inhibits wear and tear, prevents sheath cracking, improves the safety and reliability of the cable, reduces safety hazards, and improves durability.

[0018] 3. The copper wire braided sub-shield is formed by braiding a para-type wholly aromatic copolyamide stretched fiber strand and a tinned copper wire mixture. The para-type wholly aromatic copolyamide stretched fiber strand helps to improve flexibility and tensile strength, reduce local stress concentration in the shielding layer, reduce torque during bending, improve bending resistance, increase safety and reliability, and provide better durability. 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-power line core, 2-Y-shaped polyurethane elastomer isolation core, 3-bifurcation partition, 4-sector, 5-longitudinal hole, 6-monitoring line core, 7-control line core, 8-center hole, 9-auxiliary ground wire, 10-petroleum jelly, 11-double-layer polyethylene longitudinal wrapped water-blocking isolation layer, 12-CPE extruded inner sheath, 13-AFRP reinforced braided tensile layer, 14-CPE extruded outer sheath, 15-EVA wear-resistant protective layer, 16-power line core conductor, 17-semi-conductive nylon water-blocking inner sheath, 18-polyvinyl chloride insulation layer, 19-semi-conductive nylon water-blocking outer sheath, 20-first copper wire braided sub-shielding layer, 21-monitoring line core conductor, 22-XLPE insulation layer, 23-PET resin winding layer, 24-second copper wire braided sub-shielding layer, 25-control line core conductor, 26-polypropylene 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 1The moisture-proof and durable large-section mobile metal shielded soft cable for mining of the embodiment of the utility model comprises three power cores 1 uniformly spaced 120 degrees circumferentially through a Y-shaped polyurethane elastomer isolation core 2, the free ends of the three branch partitions 3 of the Y-shaped polyurethane elastomer isolation core 2 extend outward to form a fan-shaped portion 4, each fan-shaped portion 4 is provided with a longitudinal hole 5, a monitoring core 6 and two control cores 7 are respectively sleeved in the three longitudinal holes 5, a center hole 8 is provided in the center of the Y-shaped polyurethane elastomer isolation core 2, an auxiliary ground wire 9 is sleeved in the gap of the center hole 8, and the gaps in the longitudinal holes 5 and the center hole 8 are filled with petroleum jelly 10. The power core 1 includes a power core conductor 16, a semi-conductive nylon water-blocking inner sheath 17, a polyvinyl chloride insulation layer 18, a semi-conductive nylon water-blocking outer sheath 19, and a first copper wire braided shielding layer 20. Specifically, the power core conductor 16 is composed of a plurality of tinned copper monofilaments with diameters of 0.08mm to 0.3mm, twisted concentrically. The first copper wire braided shielding layer 20 is composed of a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper mixed strand, braided in counter-rotating spirals. The diameter of the para-type fully aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper strand. The auxiliary ground wire 9 is a bare copper wire. Furthermore, the auxiliary ground wire 9 is composed of a plurality of soft copper wires with diameters of 0.1mm to 0.2mm, twisted and compressed into a circular conductor structure. In one embodiment, the control core 7 includes a control core conductor 25 and a polypropylene insulation layer 26. The control core conductor 25 is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.1 mm, which are concentrically twisted. In one embodiment, the monitoring core 6 includes a monitoring core conductor 21, an XLPE insulation layer 22, a PET resin sheath 23, and a second copper wire braided shielding layer 24. Furthermore, the monitoring core conductor 21 is composed of a plurality of tinned copper monofilaments with a diameter of 0.02 mm to 0.04 mm, which are concentrically twisted. The second copper wire braided shielding layer 24 is composed of a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire, which are mutually spirally wound and woven in opposite directions. The diameter of the para-type fully aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

[0023] The Y-shaped polyurethane elastomer isolation core 2 is coated with a double-layer polyethylene longitudinally wrapped water-blocking isolation layer 11, a CPE extruded inner sheath 12, an AFRP reinforced braided tensile layer 13, a CPE extruded outer sheath 14, and an EVA wear-resistant protective layer 15 in sequence. The space between the Y-shaped polyurethane elastomer isolation core 2 and the double-layer polyethylene longitudinally wrapped water-blocking isolation layer 11 is filled with petroleum jelly 10. Furthermore, the outer surface of the CPE extruded inner sheath 12 and the inner surface of the CPE extruded outer sheath 14 are both provided with an EVA water-blocking adhesive layer. In one embodiment, the double-layer polyethylene longitudinally wrapped water-blocking isolation layer 11 is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 25% to 40%. The double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer. In one embodiment, the AFRP reinforced braided tensile layer 13 is a double-layer aramid strand braided structure with inner and outer layers that are spirally wound in opposite directions. The thickness of the EVA wear-resistant protective layer 15 is 0.1 mm to 0.3 mm, and the outer diameter of the EVA wear-resistant protective layer 15 is 80 mm to 90 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. Moisture-proof and durable large-section mobile metal shielded mining flexible cable, its characteristics are: The invention comprises three power line cores (1) uniformly distributed at 120-degree intervals in the circumferential direction through a Y-shaped polyurethane elastomer isolation core (2); the free ends of the three bifurcated partitions (3) of the Y-shaped polyurethane elastomer isolation core (2) extend outward to form a fan-shaped portion (4); each fan-shaped portion (4) is provided with a longitudinal hole (5); a monitoring line core (6) and two control line cores (7) are respectively sleeved in the three longitudinal holes (5); a central hole (8) is provided in the center of the Y-shaped polyurethane elastomer isolation core (2); an auxiliary ground wire (9) is sleeved in the gap in the central hole (8); the gaps in the longitudinal hole (5) and the central hole (8) are filled with petroleum jelly (10); the outside of the Y-shaped polyurethane elastomer isolation core (2) is covered in sequence with a plurality of protective layers. The invention relates to a power line core (1) provided with a double-layer polyethylene longitudinally wrapped water-blocking isolation layer (11), a CPE extruded inner sheath (12), an AFRP reinforced braided tensile layer (13), a CPE extruded outer sheath (14) and an EVA wear-resistant protective layer (15); petroleum jelly (10) is filled between the Y-shaped polyurethane elastomer isolation core (2) and the double-layer polyethylene longitudinally wrapped water-blocking isolation layer (11); the power line core (1) comprises a power line core conductor (16), a semi-conductive nylon water-blocking inner sheath (17), a polyvinyl chloride insulation layer (18), a semi-conductive nylon water-blocking outer sheath (19) and a first copper wire braided shielding layer (20); the auxiliary ground wire (9) is a bare copper wire; and the outer diameter of the EVA wear-resistant protective layer (15) is 80 mm to 90 mm.

2. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The power line core conductor (16) is composed of a plurality of tinned copper monofilaments with a diameter of 0.08 mm to 0.3 mm, which are coaxially twisted. The first copper wire braided shielding layer (20) is composed of a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire, which are mutually spirally twisted and braided in opposite directions. The diameter of the para-type fully aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

3. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The control core (7) comprises a control core conductor (25) and a polypropylene insulation layer (26). The control core conductor (25) is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.1 mm, which are coaxially twisted.

4. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The auxiliary ground wire (9) is a plurality of soft copper wires with a diameter of 0.1 mm to 0.2 mm twisted and tightly pressed into a circular conductor structure.

5. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The monitoring wire core (6) comprises a monitoring wire core conductor (21), an XLPE insulation layer (22), a PET resin wrapping layer (23), and a second copper wire braided shielding layer (24).

6. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 5 is characterized by: The monitoring line core conductor (21) is composed of a plurality of tinned copper monofilaments with a diameter of 0.02 mm to 0.04 mm, which are twisted concentrically. The second copper wire braided shielding layer (24) is composed of a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire, which are mutually spirally wound and woven in opposite directions. The diameter of the para-type fully aromatic copolyamide stretched fiber strand is not less than 75% of the diameter of the tinned copper wire.

7. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The double-layer polyethylene longitudinally wrapped water-blocking isolation layer (11) is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 25% to 40%. The double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer.

8. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The AFRP reinforced braided tensile layer (13) is a braided structure in which inner and outer double layers of aramid strands are spirally wound in opposite directions.

9. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1 is characterized by: The outer surface of the CPE extruded inner sheath (12) and the inner surface of the CPE extruded outer sheath (14) are both provided with an EVA water-blocking adhesive layer.

10. The moisture-proof, durable, large-section mobile metal shielded flexible cable for mining according to claim 1, characterized in that: The EVA wear-resistant protective layer (15) has a thickness of 0.1 mm to 0.3 mm.

Images