Intelligent flexible cable for coal mining machine

Abstract

The invention belongs to the technical field of cables, and provides an intelligent flexible cable for a coal mining machine, which comprises main wire cores, a control wire core group, an optical unit and a comprehensive sheath layer, and is characterized in that the comprehensive sheath layer comprises an inner sheath, a reinforcing layer, an outer sheath and a wear-resistant layer which are sequentially arranged from inside to outside; the control wire core group comprises at least two control insulation wire cores, each control insulation wire core comprises an insulation wire core conductor, a polypropylene wrapping tape and an ethylene propylene rubber insulation layer which are sequentially arranged from inside to outside, and a cotton filling layer, a wrapping tape layer and a shielding grounding layer woven by tinned copper wires are sequentially arranged on the outer side of each control insulation wire core from inside to outside; the optical unit is formed by jointly twisting a plurality of optical fibers and aramid fiber filling materials into a cable. The service life of the intelligent flexible cable for the coal mining machine is prolonged, the outer diameter of the optical unit is reduced, and the occupied space of the whole cable for the coal mining machine in use is reduced.

Description

Technical Field

[0001] The embodiments of the present invention belong to the field of cable technology, and in particular relate to an intelligent flexible cable for a coal mining machine. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Coal mining machine cables are key components of mobile equipment such as coal mining machines in underground coal mines. They are responsible for power transmission and signal control, and their performance directly affects the safety and efficiency of coal mining operations. Currently, there are still the following problems with coal mining machine cables:

[0004] (1) The control core and sheath layer of existing coal mining machine cables fail quickly, resulting in a generally short service life of coal mining machine cables (3 to 5 months); (2) Among the current optoelectronic composite coal mining machine cables, the traditional reinforced tube optical unit structure is the most common. The advantage of this structure is that the optical unit structure is more stable and has a large capacity. The disadvantage is that the cable outer diameter is larger, which occupies more working space in the underground coal mining machine. Summary of the Invention

[0005] In order to address the deficiencies of the prior art, the present invention provides an intelligent flexible cable for a coal mining machine, which adopts a comprehensive sheath layer consisting of an inner sheath, a reinforcement layer, an outer sheath and a wear-resistant layer to improve the wear resistance; adopts a control core group consisting of an insulated core conductor, a polypropylene tape, an EPDM rubber insulation layer, cotton thread filling, a tape layer and a shielded grounding layer to reduce the relative slippage between the cores and reduce fatigue damage, thereby increasing the service life of the intelligent flexible cable for a coal mining machine; the method of twisting multiple optical fibers and aramid filling into a cable reduces the outer diameter of the optical unit and reduces the space occupied by the entire coal mining machine cable during use.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An intelligent flexible cable for a coal mining machine, comprising: a main wire core, a control wire core group, an optical unit and a comprehensive sheath layer; the comprehensive sheath layer comprises an inner sheath, a reinforcement layer, an outer sheath and a wear-resistant layer arranged in sequence from the inside to the outside;

[0008] The main cores, control core groups and optical units are twisted together to form a cable core structure; in the cable core structure, multiple main cores are arranged in sequence, control core groups are arranged between adjacent main cores, and the optical unit is arranged in the center of the cable core structure, or in the gap between the main cores and the control core group;

[0009] The control core group includes at least two control insulated cores; each control insulated core includes an insulated core conductor, a polypropylene tape, and an EPDM insulation layer arranged in sequence from the inside to the outside; and on the outside of the control insulated core, a cotton filling, a tape layer, and a tinned copper wire braided shielding grounding layer are arranged in sequence from the inside to the outside;

[0010] The optical unit is made of multiple optical fibers twisted together with aramid filling to form a cable.

[0011] In one embodiment of the present invention, the main line core includes a tinned soft copper conductor, a strip, an EPDM insulation material, a semi-conductive wrapping tape, and a reinforced grounding layer arranged in sequence from the inside to the outside, wherein the reinforced grounding layer is made of a mixed braid of tinned copper wire and polypropylene cotton yarn;

[0012] Tinned soft copper conductors are multiple or multiple strands of tinned annealed copper conductors, and the strip is a layer of polyester tape or non-woven fabric wrapping tape;

[0013] The ethylene propylene rubber insulation material is extruded on the outside of the tape, the semi-conductive tape is overlapped and wrapped on the outside of the ethylene propylene rubber insulation material, and the reinforced grounding layer is woven on the outside of the semi-conductive tape.

[0014] In one implementation of the present invention, the outermost layer of the main core is a reinforced grounding layer, the outermost layer of the control core group is a shielded grounding layer, and the copper wires in the reinforced grounding layer and the shielded grounding layer are connected in parallel to serve as the ground core.

[0015] In one implementation of the present invention, the insulated core conductor adopts alloy copper-clad soft wire, which is twisted into a single-strand or multi-strand layer to achieve the required circular core cross-section, the polypropylene tape is spirally wrapped around the outside of the insulated core conductor, and the ethylene propylene rubber insulation layer is extruded on the outside of the polypropylene tape.

[0016] In one implementation of the present invention, every two control insulated wire cores are twisted to form a twisted unit, and a cotton thread made of multiple twisted cotton threads is placed longitudinally on both sides of the gap of the twisted unit to fill it. A tape layer is arranged outside the twisted unit, and a tinned copper wire braided structure is used outside the tape layer as a shielding grounding layer.

[0017] In one implementation of the present invention, the tape layers are respectively a layer of self-adhesive flame-retardant tape and a layer of reinforced non-woven fabric from the inside to the outside.

[0018] In one implementation of the present invention, the optical unit includes a polyimide or metal-coated high-temperature resistant tight-buffered optical fiber, an aramid filling, a polyurethane sheath, and a nylon lubricating layer, which are arranged in sequence from the inside to the outside.

[0019] As a further limitation of the present invention, multiple high-temperature resistant tight-buffered optical fibers and high-temperature resistant aramid filling are twisted into a cable using the SZ twisting process (i.e., a forward and reverse rotating alternating twisting process), a layer of polyether-type polyurethane sheath is extruded outside the cable core, and a layer of flame-retardant nylon lubricating layer is extruded outside the polyurethane sheath.

[0020] In one implementation of the present invention, the inner sheath and the outer sheath are made of a chloroprene rubber mixture, which is based on chloroprene rubber and is added with 43% to 67% by mass of natural rubber and 5% to 11% by mass of butadiene rubber.

[0021] In one implementation of the present invention, an aramid braided mesh reinforcement layer is used between the inner and outer sheaths, and the wear-resistant layer is made of polyurethane rubber material. When the wear-resistant layer is extruded, an aramid rope is longitudinally dragged between the wear-resistant layer and the outer sheath.

[0022] As a further limitation of the present invention, the wear-resistant layer has an arc or square convex structure, and the arc or square convex structure has a diagonal angle of 20° to 40° along the longitudinal length of the cable.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention innovatively develops an intelligent flexible cable for coal mining machines, which adopts a comprehensive sheath layer composed of an inner sheath, a reinforcement layer, an outer sheath and a wear-resistant layer to improve the wear resistance; adopts a control core group composed of an insulated core conductor, a polypropylene tape, an EPDM rubber insulation layer, cotton thread filling, a tape layer and a shielded grounding layer to reduce the relative slippage between the cores and reduce fatigue damage, thereby increasing the service life of the intelligent flexible cable for coal mining machines; the method of twisting multiple optical fibers and aramid filling into a cable reduces the outer diameter of the optical unit and reduces the space occupied by the entire coal mining machine cable during use.

[0025] The present invention does not set up a separate ground wire core conductor structure. The copper wires in the reinforced grounding layer of the main wire core and the shielded grounding layer of the control wire core group are connected in parallel as grounding functional elements, thereby reducing the outer diameter of the entire intelligent flexible cable for the coal mining machine. Through a certain structural design, the grounding cross-section requirements of the ground wire core can be guaranteed, thereby ensuring the safe use of the entire intelligent flexible cable for the coal mining machine and reducing the cost of use.

[0026] The control wire core of the present invention adopts an alloy copper-clad soft wire structure, and the alloy adopts copper-magnesium alloy material. The copper-magnesium alloy greatly improves the anti-torsion performance on the basis of the excellent electrical properties of copper. The alloy is woven on the processing structure of high-tensile fiber. The overall material and structural form can increase the life of the control wire core group by at least 200%; the insulation adopts EPDM rubber insulation material with excellent electrical and performance, and the isotropic uniformity of the insulation mechanical strength is guaranteed by process control of eccentricity of not less than 90%, thereby ensuring the life of the insulation material; every two control wire cores are twisted with a pitch-to-diameter ratio of not more than 7, which increases the flexibility of the control wire core group, and buffers the torsional force directly acting on the control wire core through cotton thread filling; the self-adhesive tape is used to fix the control wire core and the cotton thread filling, which reduces the slippage of the control wire core due to force during work, and allows the cotton thread filling to evenly bear the isotropic stress, reducing the stress on the control wire core, and avoiding the problem of the control wire core in the coal mining machine cable being the first to break and fail.

[0027] The optical fiber in the optical unit of the present invention adopts a high-temperature resistant type, which can avoid the influence of temperature rise caused by heating of the machine head during the subsequent vulcanization process and short-term overload during cable operation on the core layer, thereby reducing the accuracy of optical signal transmission; the optical fiber adopts a high-temperature resistant tight-sleeved optical fiber, which is directly twisted into a cable with high-temperature resistant aramid, which greatly reduces the outer diameter of the optical unit. At the same time, when the optical fiber is subjected to possible mechanical stress, the aramid will play a buffering role and reduce the force directly acting on the optical fiber; the polyether-type polyurethane sheath can not only effectively fix the optical cable and strengthen the aramid, but also has extremely high elasticity and good flexibility, which can minimize the direct force on the optical fiber body when the optical unit is subjected to external stress; the nylon lubricating layer can improve the overall strength and toughness of the optical unit. At the same time, the self-lubricating property of the nylon material reduces the friction stress on the entire optical unit, thereby improving the protection level of the optical unit.

[0028] The main core, control core group and optical unit of the present invention are twisted together to form a cable core structure. Multiple main cores are arranged in sequence, and control core groups are arranged between adjacent main cores. The optical unit is arranged in the center of the cable core structure or in the gap between the main core and the control core group. The outer diameter of the entire cable is reduced to the greatest extent while meeting the electrical performance requirements of the product. The tightness of the various components in the cable core structure can be effectively maintained, which is beneficial to the stability of the cable core structure, reduces the relative friction between the various components in the cable core structure, is beneficial to the stable transmission of power and optical signals, and ensures the service life of the cable.

[0029] The inner and outer sheaths of the present invention are modified to enhance the wear resistance and oxidation resistance of chloroprene rubber on the basis of oil resistance, corrosion resistance and thermal stability, thereby improving the elasticity and tear resistance of the sheath and improving the adaptability of the cable to the working environment underground in mines; an aramid braided mesh reinforcement structure is added to the center of the inner and outer sheaths to improve the overall mechanical strength of the inner and outer sheaths from the physical structure level, and to resist scratching and pulling; the wear-resistant layer adopts modified wear-resistant polyurethane rubber material, and the friction force is reduced and evenly dispersed through the raised structural design, thereby reducing the wear rate of the sheath layer; the material of the wear-resistant layer itself is a wear-resistant material, and the material and structure work together to minimize the impact of product failure caused by sheath wear failure; an aramid rope is dragged between the outer sheath and the wear-resistant layer as a "switch" for replacing the wear-resistant layer. When the wear-resistant layer is worn to a certain extent or there is a need, the wear-resistant layer can be directly cut through the aramid rope, and then a new wear-resistant layer can be directly reprocessed to continue working.

[0030] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] Figure 1 A schematic structural diagram of an intelligent flexible cable for a coal mining machine provided by an exemplary embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a main line core provided by an exemplary embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram of a control core group provided by an exemplary embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram of an optical unit provided by an exemplary embodiment of the present invention;

[0036] Figure 5 A longitudinal side view of an outer sheath provided for an exemplary embodiment of the present invention;

[0037] Among them, 1. Main line core; 11. Tinned soft copper conductor; 12. Tape; 13. EPDM rubber insulation layer; 14. Semi-conductive tape; 15. Reinforced grounding layer; 2. Control line core group; 21. Insulated core conductor; 22. EPDM rubber insulation layer; 23. Cotton thread filling; 24. Tape layer; 25. Shielded grounding layer; 26. Polypropylene tape; 3. Optical unit; 31. High-temperature resistant tight-buffered optical fiber; 32. Aramid filling; 33. Polyurethane sheath; 34. Nylon lubricating layer; 4. Ground wire core; 5. Inner sheath; 6. Reinforcement layer; 7. Outer sheath; 8. Wear-resistant layer. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0040] During the repeated retraction and dragging of the sheath of the shearer cable, the sheath is constantly worn, and the periodic bending fatigue of the shearer cable makes the insulated core conductor more likely to break. In view of this, this implementation method proposes an intelligent flexible cable for coal mining machines. By improving the sheath structure and materials, the comprehensive wear and fatigue resistance of the sheath layer is improved; the life of the control cable is improved by improving the structural design of the control core group 2, the insulated core conductor 21, and the insulation eccentricity; and by increasing the design life of the two components most prone to failure, the overall cable service life is increased.

[0041] More specifically, the intelligent flexible cable for coal mining machine of this implementation method is as follows: Figure 1 As shown, it includes the main core 1, control core group 2, ground core 4, optical unit 3 and comprehensive sheath layer (composed of inner sheath 5, reinforcement layer 6, outer sheath 7 and wear-resistant layer 8). The main core 1 is the main body of the power transmission cable. Figure 1 As shown, the main core 1 includes a tinned soft copper conductor 11, a strip 12, an EPDM rubber insulation layer 13, a semi-conductive tape 14, and a reinforced grounding layer 15 with a shielding effect, which is mixed with tinned copper wire and polypropylene cotton yarn and arranged in sequence from the inside to the outside.

[0042] More specifically, the tinned soft copper conductor 11 is a plurality of or multiple strands of tinned annealed copper conductors, and the tinned soft copper conductor 11 is wrapped with or not wrapped with a layer of polyester tape or non-woven fabric tape (as the tape 12), and an EPDM rubber insulation material is extruded outside it (as the EPDM rubber insulation layer 13), and a layer of semi-conductive tape 14 is overlapped and wrapped around the EPDM rubber insulation layer 13, and a layer of reinforcement / grounding layer (i.e., reinforcement grounding layer 15) mixed with tinned copper wire and polypropylene cotton yarn is woven outside the semi-conductive tape 14, and the weaving density should be 83%-88%; it should be noted that the mixed weaving method here can be optionally a 16-spindle weaving machine, a 24-spindle weaving machine, a 32-spindle weaving machine or a 48-spindle weaving machine, and the number of tinned copper wire and polypropylene cotton yarn in each spindle is determined according to different specification requirements, and the weaving angle and weaving pitch are set according to the specification requirements. Here, it is only necessary to ensure that the weaving density is in the range of 83%-88%.

[0043] In this implementation, the optional method of mixing tinned copper wire and polypropylene cotton yarn can be used.

[0044] The control wire core group 2 refers to a control signal transmission unit formed by twisting two control insulated wire cores. The control wire core group 2, such as Figure 2 As shown, the control core assembly 2 includes, arranged from the inside out, an insulated core conductor 21, a polypropylene tape, an EPDM insulation layer 22, a cotton filling 23, a tape layer 24, and a tinned copper wire braided shielding ground layer 25. In this implementation, the insulated core conductor 21 utilizes alloy copper-clad flexible wire. This significantly enhances the torsional resistance of copper, building on its excellent electrical properties. The insulated core conductor 21 achieves the desired circular core cross-section through single-strand or multi-strand layer twisting. The alloy is braided onto high-tensile strength fibers, extending the lifespan of the control core assembly 2 by at least 200%.

[0045] In this implementation, more specifically, a layer of polypropylene tape 26 with a thickness of 0.03 to 0.05 mm is spirally wrapped around the insulated core conductor 21 with an overlap rate of not less than 35%, and a layer of EPDM rubber insulation layer 22 with excellent electrical and performance is extruded outside the polypropylene tape 26. The isotropic uniformity of the mechanical strength of the insulation is ensured by process control with an eccentricity of not less than 90%, which can avoid insulation failure caused by excessive stress at the thinnest point, thereby ensuring the insulation life.

[0046] In this implementation, optionally, the insulated core conductor 21, the polypropylene tape 26 and the EPDM rubber insulation layer 22 arranged in sequence from the inside to the outside constitute a control insulating core, and every two control insulating cores are twisted into a control core group 2, and the twisting pitch-to-diameter ratio thereof should not exceed 7. A filling element made of multiple twisted cotton threads is placed longitudinally on both sides of the gap of the twisted unit, and the twist of the cotton thread should be approximately 30 twists / meter, which increases the flexibility of the control core group 2, and the torsional force directly acting on the control core is buffered by the cotton thread filling 23.

[0047] In this implementation, optionally, a layer of self-adhesive flame-retardant tape and a layer of reinforced tape are wrapped around the twisted unit from the inside to the outside in sequence (the two constitute the tape layer 24), the thickness of the self-adhesive flame-retardant tape is 0.10-0.25 mm, and the overlapping rate is 50%; the outside of the tape layer 24 adopts a tinned copper wire braided structure as a shielding / grounding layer (i.e., the shielding grounding layer 25), and the braiding density is not less than 85%, the self-adhesive flame-retardant tape and the reinforced tape are used to stably fix the control insulation core and the cotton thread filling 23, reduce the slippage of the control insulation core due to force during work, and allow the cotton thread filling 23 to evenly bear the stress in all directions, reduce the stress on the control insulation core, and avoid the problem of the control insulation core in the coal mining machine cable breaking and failing first.

[0048] In this implementation, the optical unit 3, such as Figure 3 As shown, it includes a polyimide or metal-coated high-temperature resistant tight-buffered optical fiber 31, an aramid filling 32, a polyurethane sheath 33 and a nylon lubricating layer 34 arranged in sequence from the inside to the outside. The high-temperature resistant tight-buffered optical fiber 31 adopts a polyimide or metal-coated high-temperature resistant optical fiber. Multiple high-temperature resistant tight-buffered optical fibers 31 and the high-temperature resistant aramid filling 32 are twisted together into a cable (forming a cable core) using an SZ twisting process (i.e., a forward and reverse rotation alternating twisting process). A layer of polyether-type polyurethane sheath 33 is extruded outside the cable core, and a layer of flame-retardant nylon lubricating layer 34 is extruded outside the polyether-type polyurethane sheath 33. The thickness of the nylon should be 0.1 to 0.2 mm.

[0049] More specifically, the optical fiber in the optical unit 3 is of a high-temperature resistant type, specifically, a polyimide or metal optical fiber coating layer is used to improve the temperature resistance of the optical fiber, to avoid the influence of the temperature rise caused by the heating of the machine head during the subsequent vulcanization process and the short-term overload during the operation of the cable on the core layer, thereby reducing the accuracy of optical signal transmission; the optical fiber adopts a high-temperature resistant tight-buffered optical fiber 31, which is directly twisted into a cable with high-temperature resistant aramid, which greatly reduces the outer diameter of the optical unit 3. At the same time, when the optical fiber is subjected to possible mechanical stress, the aramid will play a buffering role and reduce the force directly acting on the optical fiber; because the optical fiber It has a small size and low macrobending loss. When used under the actual bending radius conditions of the cable, it can ensure sufficient mechanical application space for signal transmission. The polyether polyurethane sheath 33 has two functions: one is to effectively fix the optical cable and strengthen the aramid, and the other is that the material has extremely high elasticity and good flexibility, which acts as a buffer when the optical unit 3 is subjected to external stress, thereby minimizing the direct force on the optical fiber body. The nylon lubricating layer 34 can improve the overall strength and toughness of the optical unit 3. At the same time, the self-lubricating property of the nylon material reduces the friction stress on the optical unit 3 as a whole, thereby improving the protection level of the optical unit 3.

[0050] In this implementation, the parallel connection of the copper wires in the reinforcement / grounding layer (i.e., the reinforcement grounding layer 15) of the main core 1 and the shielding / grounding layer (i.e., the shielding grounding layer 25) of the control core group 2 serves as a grounding functional element (i.e., as the ground core 4). There is no need to separately set up an independent structural ground core 4, which reduces the outer diameter of the entire cable and improves the tightness of each component of the cable core structure. The grounding cross-section requirements of the ground core 4 are guaranteed through specific structural design, thereby ensuring the safety of product use and reducing product costs.

[0051] In this implementation, the main core 1, the control core group 2, and the optical unit 3 are twisted together into a cable core structure. The twisting order is that the three main cores 1 are arranged in sequence, and the three control core groups 2 are respectively arranged in the gaps between the three main cores 1. The optical unit 3 can be set in the gaps between the main core 1 and the control core and in the middle of the three main cores 1, and is preferably set in the middle of the main core 1. The twisting section diameter ratio does not exceed 8 times; it can be understood that in some other implementations, in some special application conditions, more control core groups 2 and more main cores 1 can also be set, which will not be repeated here.

[0052] In this implementation, the comprehensive sheath layer comprises, from the inside to the outside, an inner sheath 5, a reinforcement layer 6, an outer sheath 7, and a wear-resistant layer 8, which together serve as a comprehensive cable protective layer. Optionally, the inner sheath 5 and the outer sheath 7 are made of a chloroprene rubber mixture, with an average thickness ratio preferably set to 3:7 to 6:4. The inner sheath 5 and the outer sheath 7 are made of chloroprene rubber as the base material, with 43% to 67% by mass of natural rubber and 5% to 11% of butadiene rubber added. This fully ensures the wear resistance, oil resistance, aging resistance, and mechanical properties of the inner sheath 5 and the outer sheath 7. The wear resistance and oxidation resistance of chloroprene rubber are reinforced on the basis of oil resistance, corrosion resistance, and thermal stability, thereby improving the elasticity and tear resistance of the inner sheath 5 and the outer sheath 7, and improving the product's adaptability to the working environment in underground mines.

[0053] In this implementation, optionally, an aramid woven mesh reinforcement layer 6 is used between the inner sheath 5 and the outer sheath 7. The aramid twist is required to be 90 to 130 TPM, and the weaving density is controlled at 15% to 50%. This improves the overall mechanical strength of the inner and outer sheaths 7 from a physical structure level, and makes them scratch-resistant and tensile-resistant.

[0054] In this embodiment, the wear-resistant layer 8 is optionally made of polyurethane rubber material and is molded into a sheath with a circular arc or square protrusion structure, and the protrusion has a diagonal angle of 20° to 40° in the longitudinal length of the cable. Figure 5As shown, the height does not exceed 1.2mm, the width does not exceed 1% of the outer diameter of the cable, and the thickness of the wear-resistant layer 8 is maintained at 2-3mm. The raised structural design reduces and evenly distributes the friction force, thereby accelerating the wear rate of the sheath layer. The material of the wear-resistant layer 8 itself is a wear-resistant material. The material and structure work together to minimize the impact of product failure caused by sheath wear failure. The aramid rope dragged longitudinally between the wear-resistant layer 8 and the outer sheath 7 serves as a "switch" for replacing the wear-resistant layer 8. When the wear-resistant layer 8 is worn to a certain extent or there is a need, the wear-resistant layer 8 can be directly cut through the aramid rope, and then a new wear-resistant layer 8 can be directly reprocessed to continue working, which is convenient for the overall maintenance of the cable.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intelligent flexible cable for a coal mining machine, characterized in that: include: Main line core, control line core group, optical unit and comprehensive sheath layer; the comprehensive sheath layer includes an inner sheath, a reinforcement layer, an outer sheath and a wear-resistant layer arranged in sequence from the inside to the outside; The main cores, the control core group and the optical unit are twisted together to form a cable core structure; in the cable core structure, a plurality of the main cores are arranged in sequence, the control core group is arranged between adjacent main cores, and the optical unit is arranged at the center of the cable core structure, or in the gap between the main cores and the control core group; The control wire core group includes at least two control insulated wire cores; each of the control insulated wire cores includes an insulated wire core conductor, a polypropylene tape, and an EPDM rubber insulation layer arranged in sequence from the inside to the outside; and on the outside of the control insulated wire core, a cotton filling, a tape layer, and a tinned copper wire braided shielding grounding layer are arranged in sequence from the inside to the outside; The optical unit is formed by twisting a plurality of optical fibers together with aramid filling to form a cable.

2. The intelligent flexible cable for coal mining machine according to claim 1, characterized in that: The main line core includes a tinned soft copper conductor, a strip, an EPDM insulation material, a semi-conductive wrapping tape and a reinforced grounding layer arranged in sequence from the inside to the outside. The reinforced grounding layer is made of a mixed braid of tinned copper wire and polypropylene cotton yarn. The tinned soft copper conductors are multiple or multiple strands of tinned annealed copper conductors, and the strip is a layer of polyester tape or non-woven fabric tape; The EPDM rubber insulation material is extruded on the outside of the strip, the semi-conductive tape is overlapped and wrapped around the outside of the EPDM rubber insulation material, and the reinforced grounding layer is woven on the outside of the semi-conductive tape.

3. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: The insulated core conductor is made of alloy copper-clad soft wire, which is twisted into single or multiple strands to achieve the required circular core cross-section. The polypropylene tape is spirally wrapped around the outside of the insulated core conductor, and the EPDM rubber insulation layer is extruded outside the polypropylene tape.

4. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: Every two of the control insulated wire cores are twisted to form a twisted unit, and a cotton thread filling made of multiple twisted cotton threads is longitudinally placed on both sides of the gap of the twisted unit. The wrapping layer is arranged outside the twisted unit, and a tinned copper wire braided structure is used outside the wrapping layer as a shielding grounding layer.

5. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: The tape layers are respectively composed of a layer of self-adhesive flame-retardant tape and a layer of reinforced non-woven fabric from the inside to the outside.

6. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: The optical unit comprises a high-temperature resistant tight-buffered optical fiber coated with polyimide or metal, an aramid filling, a polyurethane sheath and a nylon lubricating layer which are arranged in sequence from the inside to the outside.

7. The intelligent flexible cable for coal mining machine according to claim 6, characterized in that: A plurality of high temperature resistant tight-buffered optical fibers and the high temperature resistant aramid filling are twisted together into a cable by a forward and reverse rotation alternating twisting process. A layer of polyether type polyurethane sheath is extruded outside the cable core, and a layer of flame retardant nylon lubricating layer is extruded outside the polyurethane sheath.

8. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: The inner sheath and the outer sheath are made of a chloroprene rubber mixture, which takes chloroprene rubber as a base material and is added with 43% to 67% by mass of natural rubber and 5% to 11% of butadiene rubber.

9. The intelligent flexible cable for coal mining machine according to claim 1 or 2, characterized in that: An aramid braided mesh reinforcement layer is used between the inner sheath and the outer sheath. The wear-resistant layer is made of polyurethane rubber material. When the wear-resistant layer is extruded, an aramid rope is longitudinally dragged between the wear-resistant layer and the outer sheath.

10. The intelligent flexible cable for coal mining machine according to claim 9, characterized in that: The wear-resistant layer has an arc or square convex structure, and the arc or square convex structure has a twill angle of 20° to 40° along the longitudinal length of the cable.

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