Moisture-proof tensile three-core circular mobile power cable for coal mining machine

Abstract

The utility model discloses a moisture-proof tensile three-core circular mobile power cable for a coal mining machine, which comprises 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, the free ends of three forked partition plates of the Y-shaped polyurethane elastomer isolation core extend towards the outer side in an external expansion manner to form fan-shaped parts, the fan-shaped parts are provided with longitudinal holes, and the longitudinal holes are communicated with the Y-shaped polyurethane elastomer isolation core. A longitudinal hole is formed in the center of the Y-shaped polyurethane elastomer isolation core, a grounding conductor is sleeved with the longitudinal hole in a clearance mode, a center hole is formed in the center of the Y-shaped polyurethane elastomer isolation core, a grounding detection line is sleeved with the center hole in a clearance mode, and the longitudinal hole and the center hole are both filled with petroleum jelly. And the Y-shaped polyurethane elastomer isolation core is sequentially coated with a CPE extruded inner sheath, an anti-impact mixed wire woven mesh, a CPE extruded outer sheath and an EVA wear-resistant protective layer. The cable is better in flexibility and tensile property, is provided with the grounding detection line, is better in wear resistance of the sheath, facilitates the protection of the sheath from cracking, is better in moisture-proof and water-blocking properties, and improves the durability.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a moisture-proof and tensile-resistant three-core circular mobile power cable for a coal mining machine. Background Art

[0002] Mining cables are cables used in mines with various voltage levels, electrical equipment, mining equipment, and mining machinery. Among them, heavy-duty cables are suitable for continuous coal mining machines, long-arm coal mining machines, loaders, conveyors, and other mobile equipment that require grounding wires and grounding detection wires. Under complex and changeable working conditions, cables are subjected to repeated stretching and bending for a long time. If the flexibility and tensile strength of the cables are insufficient, they are prone to deformation and core breakage. The cables move with the continuous movement of the equipment, which can easily cause the outer skin to wear and crack. In addition, when working in a humid environment, the moisture-proof and waterproof performance of the cables is average. The electrical reliability of long-term use is poor and they are not durable. Utility Model Content

[0003] The utility model aims at the deficiencies of the prior art and aims to solve the technical problem of providing a moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines. The cable core has a round structure, high mechanical strength, better flexibility and tensile resistance, an earthing detection line, better wear resistance of the outer skin, which helps to prevent the outer skin from cracking, better moisture-proof and water-resistant performance, and improved durability.

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

[0005] A moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines comprises three power line cores uniformly distributed at 120-degree intervals in the circumferential direction through a Y-shaped polyurethane elastomer isolation core, the free ends of the three bifurcated partitions of the Y-shaped polyurethane elastomer isolation core extend outwardly to form a fan-shaped portion, the fan-shaped portion is provided with a longitudinal hole, the gap in the longitudinal hole is sleeved with a grounding conductor, the central portion of the Y-shaped polyurethane elastomer isolation core is provided with a central hole, the gap in the central hole is sleeved with a grounding detection wire, the longitudinal hole and the gap in the central hole are both filled with petroleum jelly, the outside of the Y-shaped polyurethane elastomer isolation core is sequentially coated with a CPE extruded inner sheath, an impact-resistant mixed wire braided mesh, 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 CPE extruded inner sheath, the power line core comprises a power conductor, a semi-conductive resistive water-repellent coating layer, an EPR insulating layer and an EPDM semi-conductive layer, and the grounding detection wire comprises a grounding detection conductor and a semi-conductive nylon resin layer.

[0006] Preferably, the grounding conductor is a plurality of soft copper wires with a wire diameter of 0.1 mm to 0.2 mm twisted and pressed into a circular conductor structure.

[0007] Preferably, the power conductor is composed of a number of tinned copper monofilaments with a diameter of 0.08 mm to 0.3 mm twisted together concentrically.

[0008] Preferably, the EPR insulation layer has a thickness of 2 mm to 3 mm.

[0009] Preferably, the ground detection conductor is composed of a number of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm twisted together.

[0010] Preferably, the EVA wear-resistant protective layer has a thickness of 0.1 mm to 0.3 mm.

[0011] Preferably, the impact-resistant mixed-wire braided mesh is an inner and outer double-layer mixed-wire flat woven mesh structure and is formed by mixing Kevlar wire and stainless steel wire.

[0012] Preferably, the inner layer mixed wire flat woven mesh is formed by weaving a mixture of fine Kevlar wire and fine stainless steel wire, and the outer layer mixed wire flat woven mesh is formed by weaving a mixture of coarse Kevlar wire and coarse stainless steel wire, the diameter of the coarse Kevlar wire is 3 to 8 times the diameter of the fine Kevlar wire, the diameter of the coarse stainless steel wire is 3 to 5 times the diameter of the fine stainless steel wire, and the weaving density of the inner layer mixed wire flat woven mesh is greater than the weaving density of the outer layer mixed wire flat woven mesh.

[0013] Preferably, the outer diameter of the EVA wear-resistant protective layer is 60 mm to 70 mm.

[0014] Preferably, the total thickness of the CPE extruded inner sheath and the CPE extruded outer sheath is 6 mm to 7 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. The optimized polyurethane elastomer isolation core is used to isolate and evenly distribute the three power line cores, three grounding conductors and one grounding detection line, which can prevent core crosstalk, form an effective electrical insulation distance and ensure mechanical strength. The cable core structure is round, balanced and stable, with better flexibility, which helps to reduce the occurrence of line breaks, ensure stable electrical characteristics and better durability.

[0017] 2. Filling petroleum jelly in the longitudinal holes, center hole gaps and cable core gaps helps prevent longitudinal water seepage. Adding a semi-conductive water-resistant coating between the conductor and the EPR insulation layer of the power line core is beneficial to blocking the diffusion of water vapor into the insulation layer, delaying the water tree aging phenomenon of the insulation layer, and has excellent moisture-proof and water-resistant properties, thereby improving durability.

[0018] 3. By adding an impact-resistant mixed-wire braided net between the inner and outer sheaths of the CPE extrusion package, the tensile resistance and slight impact resistance of the cable are enhanced. The impact-resistant mixed-wire braided net is formed by weaving Kevlar wire and stainless steel wire. The strong rigidity of stainless steel wire is combined with the flexibility of Kevlar wire, which takes into account the improvement of the mechanical strength, impact resistance and tensile resistance of the cable, ensures the mechanical strength and electrical characteristics of the cable, increases safety and reliability, and prolongs the service life. Coating the EVA wear-resistant protective layer on the outside of the CPE extruded outer sheath can effectively improve the wear resistance of the cable outer skin, inhibit wear and tear, protect the sheath from cracking, and improve durability. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] In the figure: 1-power line core, 2-Y-shaped polyurethane elastomer isolation core, 3-bifurcation partition, 4-fan-shaped part, 5-longitudinal hole, 6-grounding conductor, 7-center hole, 8-grounding detection line, 9-petroleum jelly, 10-CPE extruded inner sheath, 11-impact-resistant mixed wire braided mesh, 12-CPE extruded outer sheath, 13-EVA wear-resistant protective layer, 14-power conductor, 15-semiconductor water-resistant coating layer, 16-EPR insulation layer, 17-EPDM semi-conductive layer, 18-grounding detection conductor, 19-semiconducting nylon resin layer. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines of the utility model embodiment includes three power cores 1 evenly spaced at 120 degrees in the circumference through a Y-shaped polyurethane elastomer isolation core 2. The power core 1 includes a power conductor 14, a semi-conductive water-resistant coating layer 15, an EPR insulation layer 16 and an EPDM semi-conductive layer 17. Specifically, the power conductor 14 is composed of a number of tinned copper monofilaments with a diameter of 0.08mm to 0.3mm concentrically twisted. The thickness of the EPR insulation layer 16 is 2mm to 3mm. 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. The fan-shaped portion 4 is provided with a longitudinal hole 5. The gap in the longitudinal hole 5 is provided with a grounding conductor 6. Specifically, the grounding conductor 6 is a number of soft copper wires with a wire diameter of 0.1mm to 0.2mm twisted and pressed into a circular conductor structure. The Y-shaped polyurethane elastomer isolation core 2 has a central hole 7 in the center, and a ground detection line 8 is sleeved in the gap in the central hole 7. The ground detection line 8 includes a ground detection conductor 18 and a semi-conductive nylon resin layer 19. Specifically, the ground detection conductor 18 is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm, which are coaxially twisted. The longitudinal hole 5 and the gap in the central hole 7 are filled with petroleum jelly 9.

[0023] The Y-shaped polyurethane elastomer isolation core 2 is coated with a CPE extruded inner sheath 10, an impact-resistant mixed wire braided mesh 11, a CPE extruded outer sheath 12 and an EVA wear-resistant protective layer 13 in sequence, and the space between the Y-shaped polyurethane elastomer isolation core 2 and the CPE extruded inner sheath 10 is filled with petroleum jelly 9. The total thickness of the CPE extruded inner sheath 10 and the CPE extruded outer sheath 12 is 6 mm to 7 mm. In one embodiment, the impact-resistant mixed-wire braided mesh 11 is an inner and outer double-layer mixed-wire flat woven mesh structure and is formed by kevlar wire and stainless steel wire mixed wire. Further, the inner layer mixed-wire flat woven mesh is formed by fine kevlar wire and fine stainless steel wire mixed wire, and the outer layer mixed-wire flat woven mesh is formed by coarse kevlar wire and coarse stainless steel wire mixed wire. The diameter of the coarse kevlar wire is 3 to 8 times the diameter of the fine kevlar wire, and the coarse stainless steel wire is 3 to 5 times the diameter of the fine stainless steel wire. The braiding density of the inner layer mixed-wire flat woven mesh is greater than the braiding density of the outer layer mixed-wire flat woven mesh. The thickness of the EVA wear-resistant protective layer 13 is 0.1 mm to 0.3 mm. The outer diameter of the EVA wear-resistant protective layer 13 is 60 mm to 70 mm.

[0024] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. Moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines, which is characterized by: The invention comprises three power line cores (1) uniformly spaced at 120 degrees in the circumferential direction through a Y-shaped polyurethane elastomer isolation core (2); the free ends of three bifurcated partitions (3) of the Y-shaped polyurethane elastomer isolation core (2) extend outward in an outwardly expanding manner to form a fan-shaped portion (4); the fan-shaped portion (4) is provided with a longitudinal hole (5); a grounding conductor (6) is sleeved in the inner gap of the longitudinal hole (5); a central hole (7) is provided in the central portion of the Y-shaped polyurethane elastomer isolation core (2); a grounding detection line (8) is sleeved in the inner gap of the central hole (7); the inner gaps of the longitudinal hole (5) and the central hole (7) are filled with petroleum jelly (9); The Y-shaped polyurethane elastomer isolation core (2) is coated with a CPE extruded inner sheath (10), an impact-resistant mixed wire braided mesh (11), a CPE extruded outer sheath (12) and an EVA wear-resistant protective layer (13) in sequence on the outside; petroleum jelly (9) is filled between the Y-shaped polyurethane elastomer isolation core (2) and the CPE extruded inner sheath (10); the power line core (1) comprises a power conductor (14), a semiconductive resistive water coating layer (15), an EPR insulating layer (16) and an EPDM semiconductive layer (17); and the ground detection line (8) comprises a ground detection conductor (18) and a semiconductive nylon resin layer (19).

2. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The grounding conductor (6) is a plurality of soft copper wires with a wire diameter of 0.1 mm to 0.2 mm twisted and tightly pressed into a circular conductor structure.

3. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The power conductor (14) is composed of a plurality of tinned copper monofilaments having a diameter of 0.08 mm to 0.3 mm, which are coaxially twisted.

4. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The EPR insulating layer (16) has a thickness of 2 mm to 3 mm.

5. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The ground detection conductor (18) is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm, which are coaxially twisted.

6. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The EVA wear-resistant protective layer (13) has a thickness of 0.1 mm to 0.3 mm.

7. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The impact-resistant mixed-wire braided mesh (11) is an inner and outer double-layer mixed-wire flat braided mesh structure and is formed by the mixed braiding of Kevlar wire and stainless steel wire.

8. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 7 is characterized by: The inner layer mixed wire flat woven mesh is formed by weaving a mixture of fine Kevlar wire and fine stainless steel wire, and the outer layer mixed wire flat woven mesh is formed by weaving a mixture of coarse Kevlar wire and coarse stainless steel wire. The diameter of the coarse Kevlar wire is 3 to 8 times the diameter of the fine Kevlar wire, and the diameter of the coarse stainless steel wire is 3 to 5 times the diameter of the fine stainless steel wire. The weaving density of the inner layer mixed wire flat woven mesh is greater than the weaving density of the outer layer mixed wire flat woven mesh.

9. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The outer diameter of the EVA wear-resistant protective layer (13) is 60 mm to 70 mm.

10. The moisture-proof and tensile-resistant three-core circular mobile power cable for coal mining machines according to claim 1 is characterized by: The total thickness of the CPE extruded inner sheath (10) and the CPE extruded outer sheath (12) is 6 mm to 7 mm.

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