Mining coal mining machine cable

Abstract

The utility model discloses a mining coal mining machine cable, which comprises a longitudinally extending cable core, and an inner sheath, a braided reinforcing layer and an outer sheath which are sequentially arranged outside the cable core, the cable core comprises a ground wire core, a plurality of control wire cores and a plurality of power wire cores; every two adjacent power wire cores are arranged in a tangent mode, and the ground wire core is arranged in a gap defined by the multiple power wire cores and abuts against the multiple power wire cores. Each control wire core is arranged between every two adjacent power wire cores and located on the outer side of a gap defined by the power wire cores. The mining coal mining machine cable solves the technical problem that a control cable core of a traditional coal mining machine cable is easy to break.

Description

Technical Field

[0001] The utility model belongs to the technical field of wire and cable, and particularly relates to a cable for a mining shearer. Background Art

[0002] All kinds of mineral resources in our country are quite rich, and the essential equipment for mineral mining is a shearer. Due to the harsh working environment of the underground shearer, extremely high requirements are imposed on the shearer and its accessories. At present, a considerable number of cables used by shearers are scrapped every year due to the working conditions. After a long time of being affected by external factors such as bending and mechanical pressure, the traditional shearer cable will show the phenomenon of "fatigue". After long-term use, the conductor of the power core wire and the conductor of the control core wire inside the cable will break, and it cannot be used continuously.

[0003] Chinese Utility Model Patent Authorization Publication No. CN202512922U discloses a steel wire braided reinforced shearer rubber flexible cable, which includes a cable core composed of a ground wire core, a control wire core and three power wire cores arranged around the ground wire core, and an inner sheath layer, a steel wire braided reinforcement layer and an outer sheath layer sequentially wrapped outside the cable core. When the shearer rubber flexible cable is used, the internal structure of the control wire core is narrow, and the wire cores are squeezed against each other when bent, and the control wire core is prone to breakage. Content of the Utility Model

[0004] Aiming at the existing technical problems, the utility model aims to provide a cable for a mining shearer, which can solve the technical problem that the control wire core of the traditional shearer cable is prone to breakage.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A cable for a mining shearer includes a longitudinally extending cable core, and an inner sheath, a braided reinforcement layer and an outer sheath sequentially arranged outside the cable core; its structural feature is that: the cable core includes a ground wire core, a plurality of control wire cores and a plurality of power wire cores; two adjacent power wire cores are arranged tangentially, the ground wire core is arranged in the gap surrounded by the plurality of power wire cores and abuts against the plurality of power wire cores; the control wire cores are arranged between two adjacent power wire cores and are located outside the gap surrounded by the plurality of power wire cores.

[0007] By arranging the control wire cores into a plurality of pieces, arranging the control wire cores between two adjacent power wire cores, and arranging the ground wire core in the gap surrounded by the power wire cores, the overall structure of the cable core is made more round and the stability of the cable core structure is ensured. When the cable is used, the bearing capacity received is mainly distributed on the power wire cores with large cross-sections, while the control wire cores are less stressed and are not easily broken.

[0008] Preferably, there are three power cores and three control cores. The three power cores are arranged in a triangular shape. The ground core is located in the center of the cable. The three power cores are arranged in a triangular shape, and the multi-core control cores are divided into three parts and placed between the power cores, so that the core structure is symmetric and compact, improving the anti-extrusion and bending resistance of the cable.

[0009] Specifically, the control core includes two control-core insulated cores and a control-core filling rubber strip filled around the control-core insulated cores. An inner sheath for the control core is extruded outside the multiple control-core insulated cores.

[0010] Preferably, the control-core insulated core includes a control-core conductor and a control-core insulating layer arranged in sequence from inside to outside. A tensile element is provided inside the control-core conductor, and the control-core insulating layer is made of ethylene propylene rubber insulating material. By providing the tensile element, when the control core is stressed, most of the tensile force is borne by the tensile element, and the control-core conductor is not easily broken, so that the control core has excellent bending resistance.

[0011] Preferably, the tensile element is arranged at the center of the control-core conductor, and the tensile element is made of copper foil wire material.

[0012] Specifically, the power core includes a power-core conductor, a power-core insulating layer, a power-core tape layer, and a power-core braided shielding layer arranged in sequence from inside to outside. The power-core insulating layer is made of ethylene propylene rubber insulating material.

[0013] Preferably, the power-core braided shielding layer is made of a mixture of tinned copper wires and fiber wires, and the unidirectional coverage rate of the tinned copper wires is not less than 80%. The mixed weaving of fiber wires can reduce the production cost of the product and is also convenient for identification. In addition, the tinned copper wires are in contact with the ground core to form a metal shielding protection layer, which can not only quickly lead out the induced current or fault current, but also effectively prevent the electromagnetic interference formed by the cable to the equipment.

[0014] Preferably, a filling cord is also provided for filling inside the core.

[0015] Preferably, the braided strengthening layer is braided and strengthened with aramid yarn, and the braiding density is not greater than 30%. Considering the harsh working conditions of cable dragging, abrasion and extrusion, the aramid yarn braided strengthening layer and the inner sheath are provided to cope with the complex underground mine environment.

[0016] Preferably, the outer sheath is made of a low-smoke and halogen-free sheath material based on EVM, and the tensile strength is not less than 12 MPa. The use of low-smoke and halogen-free materials makes the cable body have low-smoke and halogen-free characteristics, which can meet the use in complex and enclosed underground spaces.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. The cable of the coal mining shearer of the present utility model optimizes the arrangement of the control cores, ensuring the stability of the core structure; when the cable is in use, the dynamic load-bearing is mainly distributed on the large-section power cores, while the control cores are less stressed and not easily broken.

[0019] 2. The cable of the coal mining shearer of the present utility model is doped with a tensile element in the center of the control cores. When the control cores are stressed, most of the tensile force is borne by the tensile element, and the conductors of the control cores are not easily broken, so that the control cores have excellent bending resistance characteristics.

[0020] 3. For the cable of the coal mining shearer of the present utility model, the braided shielding layer of the power cores is made of a mixture of tinned copper wires and fiber wires. On the one hand, it reduces the production cost of the product and is convenient for identification. On the other hand, the tinned copper wires are connected to the ground cores to form a metal shielding protection layer, which can not only quickly lead out the induced current or fault current, but also effectively prevent the cable from causing electromagnetic interference to the equipment.

[0021] 4. For the cable of the coal mining shearer of the present utility model, considering the harsh working conditions of cable dragging, grinding and extrusion, an aramid yarn braided strengthening layer and an inner sheath are provided to cope with the complex underground mine environment.

[0022] 5. The cable of the coal mining shearer of the present utility model uses a low-smoke and halogen-free material, so that the cable body has low-smoke and halogen-free characteristics and can meet the use in complex and enclosed underground spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a cable of a coal mining shearer of the present utility model;

[0024] Figure 2 is Figure 1 the schematic structural diagram of the control cores in

[0025] Figure 3 is Figure 2 the schematic structural diagram of the conductors of the control cores in

[0026] In the figure

[0027] 1 - ground core, 2 - power core, 21 - power core conductor, 22 - power core insulation layer, 23 - power core tape layer, 24 - power core braided shielding layer, 3 - control core, 31 - control core insulated core, 311 - control core conductor, 312 - control core insulation layer, 313 - tensile element, 32 - control core filling rubber strip, 33 - control core inner sheath, 4 - filling rope, 5 - inner sheath, 6 - braided strengthening layer, 7 - outer sheath. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. For the convenience of narration, words such as "upper", "lower", "left", and "right" hereinafter only indicate the same directions as the upper, lower, left, and right directions of the accompanying drawings themselves, and do not limit the structure.

[0029] As Figure 1 shown, a mining shearer cable includes a longitudinally extending cable core, and an inner sheath 5, a braided reinforcement layer 6, and an outer sheath 7 sequentially arranged outside the cable core. The cable core includes a ground wire core 1, three control wire cores 3, and three power wire cores 2. The three power wire cores 2 are tangent to each other in pairs and arranged in a triangular pyramid shape. The ground wire core 1 is arranged in the gap surrounded by the three power wire cores 2 and abuts against the three power wire cores 2. The conductor of the ground wire core 1 adopts a class 5 conductor structure, the single wire of the conductor is not greater than 0.382 mm, the conductor adopts concentric regular stranding, the directions of adjacent layers are opposite, and the stranding direction of the outermost layer and the strand bundle is the same. The control wire core 3 is arranged between two adjacent power wire cores 2 and is located outside the gap surrounded by the three power wire cores 2. The cable core is processed by a stranding device with a back-twist device, and its stranding pitch ratio should not be greater than 10. High-temperature flame-retardant filling ropes 4 are used for filling inside the cable core, and flame-retardant tapes are used for wrapping, so as to ensure that the cable has excellent flame-retardant performance. Among them, the flame-retardant tape is preferably a fiberglass tape or a high-flame-retardant fiberglass cloth tape. The inner sheath 5 is extruded with a low-smoke and halogen-free rubber, and the inner sheath 5 should tightly wrap the cable core. The braided reinforcement layer 6 is braided and reinforced with 1000D-2000D aramid yarn, and the braiding density is not greater than 30%. The outer sheath 7 is made of a low-smoke and halogen-free sheath material based on EVM, and the tensile strength is not less than 12 MPa, so as to ensure that the cable does not crack and deform when subjected to mechanical external forces.

[0030] As Figure 1 shown, the power wire core 2 includes a power wire core conductor 21, a power wire core insulation layer 22, a power wire core tape layer 23, and a power wire core braided shielding layer 24 arranged in sequence from the inside to the outside. The power wire core insulation layer 22 is made of ethylene propylene rubber insulation material, and the tensile strength of the insulation material is not less than 10 MPa. The power wire core braided shielding layer 24 is made of a mixture of tinned copper wires and fiber wires, the unidirectional coverage rate of the tinned copper wires is not less than 80%, and the wire core identification is color-coded by using fiber wires of different colors. The power wire core conductor 21 is made of a strand composed of copper single wires not greater than 0.283 mm and is double-stranded again, the direction of the outermost layer of the double-stranding is the same as the stranding direction of the strand bundle, and the conductor pitch ratio is controlled between 16 and 25.

[0031] As Figure 2As shown, the control core 3 includes two control core insulated cores 31 and a control core filling rubber strip 32 filled around the control core insulated cores 31. An inner sheath 33 of the control core is extruded outside the two control core insulated cores 31. The inner sheath 33 of the control core is made of a low-smoke, halogen-free, flame-retardant sheath or a similar mixture material and is processed by an extrusion rubber device. The control core insulated core 31 includes a control core conductor 311 and a control core insulation layer 312 arranged in sequence from the inside to the outside. The control core insulation layer 312 is made of ethylene propylene rubber insulation material, and the tensile strength of this insulation material is not less than 10 MPa. As Figure 3 shown, a tensile element 313 is provided at the center of the control core conductor 311, and the tensile element 313 is made of copper foil wire material. The control core conductor 311 is made by first bunching and then stranding. When bunching, copper single wires with a diameter not greater than 0.19 mm are mixed and bunched with copper foil wires. The bunching method is regular bunching, and each strand contains not less than 1 copper foil wire. The control core conductor 311 adopts a category 6 conductor structure with a smaller diameter of the conductor single wire, and the minimum diameter of the conductor single wire reaches 0.19 mm, and the conductor has better bending performance. The control core insulated cores 31 are twisted in pairs, and processed by a cabling device with a back-twist device. Styrene-butadiene rubber or a similar mixture is used as the intermediate filling rubber strip 32 on the side of the core. The twisting direction can be selected as left or right. At the same time, the pitch of each group of cores should not be greater than 100 mm, and the pitch of adjacent core groups should differ by 10 mm.

[0032] The content clarified in the above embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, rather than to limit the scope of the present invention. After reading the present invention, various equivalent forms of modification of this embodiment by those skilled in the art all fall within the scope defined by the appended claims of the present invention.

Claims

1. A cable for a mining shearer, comprising a longitudinally extending cable core, and an inner sheath (5), a braided strengthening layer (6) and an outer sheath (7) sequentially arranged outside the cable core; characterized in that: The cable core includes a ground wire core (1), multiple control wire cores (3) and multiple power wire cores (2); Two adjacent power wire cores (2) are arranged in a tangential manner. The ground wire core (1) is arranged in the gap surrounded by the multiple power wire cores (2) and is in contact with the multiple power wire cores (2); The control wire core (3) is arranged between two adjacent power wire cores (2) and is located outside the gap surrounded by the multiple power wire cores (2).

2. The cable for a mining shearer according to claim 1, characterized in that: There are three power wire cores (2) and three control wire cores (3). The three power wire cores (2) are arranged in a triangular formation.

3. The cable for a mining shearer according to claim 2, characterized in that: The control wire core (3) includes two control wire core insulated wire cores (31) and a control wire core filling rubber strip (32) filled around the control wire core insulated wire cores (31). A control wire core inner sheath (33) is extruded outside the multiple control wire core insulated wire cores (31).

4. The cable for a mining shearer according to claim 3, characterized in that: The control wire core insulated wire core (31) includes a control wire core conductor (311) and a control wire core insulation layer (312) arranged in sequence from the inside to the outside. A tensile element (313) is provided in the control wire core conductor (311). The control wire core insulation layer (312) is made of ethylene propylene rubber insulation material.

5. The mining shearer cable according to claim 4, characterized in that: The tensile element (313) is arranged at the center of the control wire core conductor (311) and is made of copper foil wire material.

6. The cable for a mining shearer according to claim 1, characterized in that: The power wire core (2) includes a power wire core conductor (21), a power wire core insulation layer (22), a power wire core tape layer (23) and a power wire core braided shielding layer (24) arranged in sequence from the inside to the outside. The power wire core insulation layer (22) is made of ethylene propylene rubber insulation material.

7. The cable for a mining shearer according to claim 6, wherein: The power wire core braided shielding layer (24) is made by mixing and braiding tinned copper wires and fiber wires, and the unidirectional coverage rate of the tinned copper wires is not less than 80%.

8. The cable for a mining shearer according to claim 1, wherein: A filling cord (4) is also provided in the cable core for filling.

9. The mining shearer cable according to claim 1, wherein: The braided strengthening layer (6) is strengthened by braiding aramid yarns, and the braiding density is not greater than 30%.

10. The cable for a mining shearer according to claim 1, characterized in that: The outer sheath (7) is made of a low-smoke and halogen-free sheath material based on EVM, and the tensile strength is not lower than 12 MPa.

Images