Optical fiber composite coal cutter rubber jacketed flexible cable for intelligent mine

Abstract

The utility model belongs to the technical field of cables, and relates to an optical fiber composite coal cutter rubber jacketed flexible cable for intelligent mines, which comprises an aramid rope, a saddle-shaped support is extruded outside the aramid rope, a cable core is arranged at the arc position of the saddle-shaped support, and the cable core comprises three main cable cores, two control cable core groups and an optical fiber unit. The three main wire cores are arranged at the large arc position of the outer side of the saddle-shaped support, the two control wire core sets and the optical fiber unit are arranged at the small arc position of the outer side of the saddle-shaped support, and the two control wire core sets and the optical fiber unit are arranged between the adjacent main wire cores respectively. The cable further comprises a coating layer arranged outside the cable core, and the coating layer sequentially comprises an aramid yarn braid layer and an outer sheath from inside to outside. According to the utility model, each strand of the control wire core conductor of the cable is formed by twisting a plurality of copper wires and aramid yarns, and seven strands of strands are twisted according to a 1 + 6 regular structure, so that the flexibility and tension resistance of the control wire core are improved; the optical fiber unit is arranged in the gap outside the cable, and the service life of the optical fiber can be prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and in particular relates to a rubber-sheathed flexible cable for an intelligent coal mining fiber composite coal mining machine. Background Technology

[0002] Intelligent mines emphasize the application of automation and intelligent technologies in the mining production process, and intelligent mining is the development trend of coal mining. With the country's vigorous promotion of intelligent mine transformation, the intelligent technology of coal mining equipment has been rapidly advanced. Conventional coal mining machine mobile cables can only be used for power transmission and control signals, and cannot meet the intelligent monitoring functions of coal mining equipment. Fiber optic composite coal mining machine rubber-sheathed flexible cables are widely used in conjunction with intelligent coal mining equipment. These cables are used for power transmission, signal transmission, and intelligent monitoring of coal mining machines in intelligent underground working faces. They provide intelligent feedback functions for information such as images, gas concentration, and temperature, facilitating timely monitoring of the coal mining face operation by mine personnel.

[0003] The core diameter of the control wire for coal mining machines is typically 2.5-6 mm. 2 The tensile strength of a conductor is generally 20 times that of its cross-sectional area. Due to the limitation of the conductor's cross-sectional area, the tensile strength of the control core is very small. Because the cable is used for a long time and frequently by bending, and the minimum bending radius of the cable is only 3 times the cable's outer diameter, the control core, which is constantly under high-intensity operation, often breaks.

[0004] Due to the harsh working environment of coal mining machines, to effectively prevent damage from ground coal gangue and falling large coal chunks from the fiber optic units inside the rubber-sheathed flexible cable of the fiber optic composite coal mining machine, the fiber optic units are generally located in the center of the cable. Existing fiber optic composite coal mining machine rubber-sheathed flexible cables use three sets of power cores and three sets of control cores arranged alternately. The cable center is supported by a saddle-shaped bracket made of semi-conductive rubber through high-temperature steam vulcanization, with the fiber optic units positioned at the center of the saddle-shaped bracket.

[0005] Due to the limitation of the outer diameter of the fiber optic unit, the thickness and height of the saddle-shaped support need to be increased in order to place the fiber optic unit at the center of the support. This results in an increase in the outer diameter of the cable and a larger overall cable outer diameter, affecting the cable's bending radius. Furthermore, under long-term, frequent, and excessive bending and stretching stress, the central fiber optic unit is directly subjected to tensile force and is prone to breakage.

[0006] The control conductor is reinforced by a multi-strand high-strength Kevlar aramid rope. Because the aramid rope is softer than the copper wire, the tension of the two is different when the control conductor is twisted. The overall tensile strength of the aramid rope is poor. During long-term bending and movement, the copper wire of the control conductor is stressed earlier than the aramid rope, causing the control conductor to break. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines. Each strand of the control core in this invention is composed of multiple copper wires and aramid yarn twisted together, and then seven strands are twisted together in a 1+6 regular structure, increasing the flexibility and tensile strength of the control core. The fiber optic unit is placed in the outer gap of the cable to prevent the fiber from breaking due to bending stress at the center of the cable, thus improving the service life of the fiber. This invention solves the problems of broken control cores and fiber optic units, and excessively large cable outer diameter in existing technologies.

[0008] To achieve the above technical objectives, the technical solution adopted in this utility model embodiment is as follows:

[0009] A rubber-sheathed flexible cable for a smart mine fiber optic composite coal mining machine includes an aramid rope, with a saddle-shaped support extruded over the aramid rope. A cable core is provided at the arc of the saddle-shaped support, and the cable core includes three main cores, two sets of control cores, and one optical fiber unit.

[0010] Among them, three main wire cores are set at the outer large arc of the saddle-shaped bracket, two sets of control wire cores and one optical fiber unit are set at the outer small arc of the saddle-shaped bracket, and the two sets of control wire cores and one optical fiber unit are respectively set between adjacent main wire cores.

[0011] It also includes a sheathing layer disposed outside the cable core, the sheathing layer comprising, from the inside out, an aramid yarn braided layer and an outer sheath.

[0012] Furthermore, the main wire core is made of multiple strands of copper wire twisted together, and a flexible non-woven fabric layer is wrapped around the main wire core. A first insulating layer is extruded over the flexible non-woven fabric layer, and a semi-conductive cloth tape is wrapped around the first insulating layer as an insulating shielding layer. A first metal shielding layer is provided outside the insulating shielding layer, and a first semi-conductive cloth tape layer is wrapped around the first metal shielding layer.

[0013] Furthermore, the control core assembly includes a control core, a second insulation layer, a second metal shielding layer, and a second semiconductive fabric layer. The control core is extruded with the second insulation layer, and multiple control cores with the extruded second insulation layer are twisted into a cable. The cable is provided with a second metal shielding layer, and the second semiconductive fabric layer is wrapped around the second metal shielding layer.

[0014] Furthermore, the optical fiber unit is extruded with an insulating protective layer, and a third semi-conductive tape layer is wrapped around the insulating protective layer.

[0015] Furthermore, the outer diameter of the extruded insulating protective layer is the same as the outer diameter of the control wire core assembly.

[0016] Furthermore, the control wire core is made of 7 strands of copper wire twisted together, and each strand of copper wire is made of multiple copper wires and two strands of aramid yarn bonded together.

[0017] Furthermore, the first metal shielding layer also serves as the ground wire core, and is made of stranded tin-plated copper wire and polyester fiber filaments.

[0018] Furthermore, the optical fiber unit has 4-18 cores, which are placed inside multiple loose tubes and twisted together, with a central reinforcing member and the side gaps filled with aramid fibers.

[0019] The beneficial effects of the technical solution provided by this utility model embodiment are:

[0020] 1) The rubber-sheathed flexible cable for the intelligent coal mining fiber composite coal mining machine of this utility model includes a main core, a control core group and an optical fiber unit, wherein the main core provides power transmission, the control core group provides signal control, and the optical fiber unit realizes intelligent communication. The rubber-sheathed flexible cable for the fiber composite coal mining machine realizes the triple function of the cable.

[0021] 2) This utility model integrates the optical fiber unit into the gap of the main core, without occupying the space of the saddle-shaped bracket, which can reduce the outer diameter of the cable and the bending radius of the cable, thereby increasing the bending performance of the cable.

[0022] 3) Each strand of the control wire core of this utility model is made of multiple copper wires and high-strength aramid yarn twisted together, and then the 7 strands are twisted together in a 1+6 regular structure to increase the overall flexibility and tensile strength of the control wire core.

[0023] 4) The cable core of this utility model is embedded with aramid yarn braid to enhance the anti-torsion performance of the core, and the extruded outer sheath is embedded in the aramid yarn braid to enhance the tensile performance of the cable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the rubber-sheathed flexible cable for the intelligent mine fiber optic composite coal mining machine in this embodiment of the present invention.

[0025] Figure 2 for Figure 1 A schematic diagram of the control conductor in the rubber-sheathed flexible cable of a fiber optic composite coal mining machine.

[0026] Explanation of reference numerals in the attached diagram: 1-Main core; 2-Flexible non-woven fabric layer; 3-First insulation layer; 4-Insulation shielding layer; 5-First metal shielding layer; 6-First semi-conductive fabric layer; 7-Control core; 8-Second insulation layer; 9-Second metal shielding layer; 10-Second semi-conductive fabric layer; 11-Aramid rope; 12-Saddle-shaped bracket; 13-Fiber optic unit; 14-Insulation protective layer; 15-Third semi-conductive fabric layer; 16-Aramid yarn braided layer; 17-Outer sheath; 18-Aramid yarn; 19-Copper wire. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the directional terms such as "inner" and "outer", "upper" and "lower", "left" and "right" indicate the orientation or positional relationship, which are usually based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model. Example

[0029] like Figure 1 As shown, a rubber-sheathed flexible cable for a smart mine fiber optic composite coal mining machine includes an aramid rope 11, an aramid rope 11 with a saddle-shaped bracket 12 extruded on the outside, and a cable core is provided at the arc of the saddle-shaped bracket 12. The cable core includes three main wire cores 1, two sets of control wire core groups and one optical fiber unit 13.

[0030] Three main wire cores 1 are set at the outer large arc of the saddle-shaped bracket 12, two sets of control wire cores and one fiber unit 13 are set at the outer small arc of the saddle-shaped bracket 12, and the two sets of control wire cores and one fiber unit 13 are respectively set between adjacent main wire cores 1.

[0031] It also includes a sheathing layer disposed outside the cable core, which, from the inside out, includes an aramid yarn braided layer 16 and an outer sheath 17.

[0032] Among them, the saddle-shaped bracket 12 is made by extruding semi-conductive rubber using a special saddle-shaped mold.

[0033] To prevent bulging and twisting during the bending of the core, the aramid yarn braided layer 16 is made of 36 spindles of high-strength aramid yarn, and the outer sheath 17 is made of high-strength neoprene rubber with a tensile strength ≥15.0 N / mm².

[0034] The main core 1 is made of multiple strands of copper wire twisted together. The main core 1 is wrapped with a flexible non-woven fabric layer 2. The flexible non-woven fabric layer 2 is extruded with a first insulating layer 3. The first insulating layer 3 is wrapped with a semi-conductive cloth tape as an insulating shielding layer 4. The insulating shielding layer 4 is provided with a first metal shielding layer 5. The first metal shielding layer 5 is wrapped with a first semi-conductive cloth tape layer 6.

[0035] The first metal shielding layer 5 also serves as the ground wire core, and is made of stranded tinned copper wire and polyester fiber filaments.

[0036] Overlapping and wrapping the first semiconductive cloth tape layer 6 around the first metal shielding layer 5 allows the insulating shielding layer 4 to be more tightly attached to the first metal shielding layer 5, resulting in a better shielding effect.

[0037] The control core assembly includes a control core 7, a second insulation layer 8, a second metal shielding layer 9, and a second semi-conductive fabric layer 10. The control core 7 is wrapped with the second insulation layer 8. Multiple control cores 7 wrapped with the second insulation layer 8 are twisted into a cable. The cable is provided with a second metal shielding layer 9. The second semi-conductive fabric layer 10 is wrapped around the second metal shielding layer 9.

[0038] Both the first insulating layer 3 and the second insulating layer 8 have a tensile strength ≥ 8.0 N / mm². 2 It is made of high-strength EPDM rubber.

[0039] To prevent shielding interference, the second metal shielding layer 9 is made of copper wire braid. To prevent the second metal shielding layer 9 from sticking to the outer sheath 17, the second metal shielding layer 9 is wrapped with the second semi-conductive cloth tape layer 10.

[0040] The control wire core 7 is composed of 7 strands of copper wire twisted together. Each strand of copper wire is composed of multiple copper wires 19 and two Kevlar aramid yarns 18 bonded together, such as... Figure 2 As shown, in order to increase the tensile strength of the control wire core 7, a multi-strand high-strength Kevlar aramid filament is used to support and reinforce the center of each copper wire strand.

[0041] The optical fiber unit 13 is covered with an insulating protective layer 14. In order to ensure that all shielding layers have good conductivity and play a role in balancing the potential, a third semi-conductive tape layer 15 is wrapped around the insulating protective layer 14.

[0042] The extruded outer diameter of the insulation protective layer 14 is the same as the outer diameter of the control wire core assembly. The insulation protective layer 14 has a tensile strength ≥8.0 N / mm². 2 It is made of high-strength EPDM rubber.

[0043] The fiber unit 13 consists of 4-18 cores, which are placed inside multiple loose tubes and twisted together. The center is a reinforcing member, and the gaps on the sides are filled with aramid fibers.

[0044] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rubber-sheathed flexible cable for an intelligent fiber optic composite coal mining machine, characterized in that, It includes an aramid rope (11), which is extruded with a saddle-shaped bracket (12). The saddle-shaped bracket (12) has a cable core at its arc. The cable core includes three main wire cores (1), two sets of control wire cores and one optical fiber unit (13). Among them, three main wire cores (1) are set at the outer large arc of the saddle-shaped bracket (12), two sets of control wire cores and one fiber unit (13) are set at the outer small arc of the saddle-shaped bracket (12), and the two sets of control wire cores and one fiber unit (13) are respectively set between adjacent main wire cores (1). It also includes a sheathing layer disposed outside the cable core, the sheathing layer comprising, from the inside out, an aramid yarn braided layer (16) and an outer sheath (17).

2. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 1, characterized in that, The main wire core (1) is made of multiple strands of copper wire twisted together. The main wire core (1) is wrapped with a flexible non-woven fabric layer (2). The flexible non-woven fabric layer (2) is extruded with a first insulating layer (3). The first insulating layer (3) is wrapped with a semi-conductive cloth tape as an insulating shielding layer (4). The insulating shielding layer (4) is provided with a first metal shielding layer (5). The first metal shielding layer (5) is wrapped with a first semi-conductive cloth tape layer (6).

3. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 1, characterized in that, The control core assembly includes a control core (7), a second insulation layer (8), a second metal shielding layer (9), and a second semiconductive fabric layer (10). The control core (7) is extruded with the second insulation layer (8). Multiple control cores (7) with the extruded second insulation layer (8) are twisted into a cable. The cable is provided with a second metal shielding layer (9). The second metal shielding layer (9) is wrapped with the second semiconductive fabric layer (10).

4. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 1, characterized in that, The optical fiber unit (13) is covered with an insulating protective layer (14), and the insulating protective layer (14) is wrapped with a third semi-conductive tape layer (15).

5. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 4, characterized in that, The outer diameter of the extruded insulating protective layer (14) is the same as the outer diameter of the control wire core group.

6. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 3, characterized in that, The control core (7) is made of 7 strands of copper wire twisted together, and each strand of copper wire is made of multiple copper wires (19) and two strands of aramid yarn (18) bonded together.

7. The rubber-sheathed flexible cable for intelligent mining fiber-optic composite coal mining machines according to claim 2, characterized in that, The first metal shielding layer (5) also serves as the ground core and is made of stranded tin-plated copper wire and polyester fiber filaments.

8. The rubber-sheathed flexible cable for intelligent mining fiber optic composite coal mining machines according to claim 1 or 4, characterized in that, The optical fiber unit (13) consists of 4-18 cores, which are placed inside multiple loose tubes and twisted together. The center is a reinforcing member, and the side gaps are filled with aramid fibers.

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