Variable frequency cable for mining coal mining machine

Abstract

The utility model relates to the technical field of cables, and discloses a mining coal mining machine frequency conversion cable, which comprises a sheath assembly, a filling layer is fixedly connected in the sheath assembly, a wire assembly is fixedly connected in the filling layer, the wire assembly comprises a plurality of insulating layers, and the insulating layers are arranged in the sheath assembly. The exteriors of the plurality of insulating layers are fixedly connected to the interior of the filling layer, conductors are fixedly connected to the interiors of the insulating layers, a plurality of power lines are fixedly connected to the interior of the filling layer, a plurality of ground wires are fixedly connected to the interior of the filling layer, and a plurality of signal lines are fixedly connected to the interior of the filling layer. And a plurality of shielding wires are fixedly connected in the filling layer. According to the utility model, crosstalk of electromagnetic interference generated in the transmission process of the power line to the signal line is effectively reduced, accurate transmission of control signals is guaranteed, and when the temperature of the cable rises abnormally, the frequency converter can be linked to stop, thereby avoiding faults or fire disasters caused by overheating of the cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to frequency conversion cables for coal mining machines. Background Technology

[0002] Mining cables are short for coal mine cables. All mining cables are flame-retardant and must be certified with a mining product safety mark certificate issued by the National Mining Product Safety Mark Center. The underground mining environment is complex, with high humidity, coal dust, and rock friction, making ordinary cables insufficient. Mining machine frequency conversion cables possess many characteristics to address these challenges. For example, their outer sheath uses high-strength, highly abrasion-resistant high-quality rubber. For instance, the rubber-sheathed mining machine cables produced by Tianjin Cable Factory Rubber and Plastic Cable Plant effectively resist moisture, dust, and rock friction, preventing damage to the cable sheath.

[0003] A search revealed Chinese Patent Publication No. CN201374206Y, which discloses a special cable for mining frequency converters. The aim is to provide a mining frequency converter special cable that saves manufacturing costs, reduces the electric field strength and magnetic flux density around the cable, and protects human health. The technical solution adopted is as follows: three power conductor cores (1) and six control conductor cores (4) are provided inside the sheath (8). The power conductor cores (1) are provided with an insulation layer (2) and a metal shielding layer (3). The control conductor cores (4) are provided with a control line insulation layer (5). Every two control conductor cores (4) are wrapped by a control line shielding layer (6). The control line sheath (7) is placed on the control line shielding layer (6). This utility model is mainly used in mining frequency converters, coal mining machines, and similar equipment.

[0004] However, in existing technologies, many traditional coal mining machine cables use a copper core conductor + rubber sheath structure, which only meets basic power transmission requirements and has the following problems: high-frequency harmonics from the frequency converter cause cable heating and signal distortion, affecting the control accuracy of the coal mining machine; complex underground working conditions can easily cause cable compression deformation and insulation damage, leading to short circuit faults; and the lack of flame-retardant and anti-static design poses a risk of gas explosion. Traditional cables have insufficient suppression capability against 2-150kHz high-frequency interference generated by frequency converters, with a signal error rate ≥1×10⁻⁶. -3 In the humid and dusty environment of underground mines, the average service life of cables is ≤6 months, and they lack condition monitoring functions, with fault location taking >2 hours. Therefore, the frequency conversion cable for mining coal mining machines is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a frequency conversion cable for mining coal mining machines, which aims to improve the problem that the complex working conditions underground can easily cause cable compression deformation, insulation layer damage, and short circuit faults.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A frequency conversion cable for a coal mining machine includes a sheath assembly, wherein a filling layer is fixedly connected inside the sheath assembly, and a conductor assembly is fixedly connected inside the filling layer.

[0008] The conductor assembly includes multiple insulating layers, the exterior of each insulating layer is fixedly connected to the interior of the filling layer, conductors are fixedly connected to the interior of each insulating layer, multiple power lines are fixedly connected to the interior of each filling layer, multiple ground lines are fixedly connected to the interior of each filling layer, multiple signal lines are fixedly connected to the interior of each filling layer, and multiple shielding lines are fixedly connected to the interior of each filling layer.

[0009] Through the above technical solutions, reliable power transmission and signal control are achieved. The sheath assembly provides protection, the filler layer stabilizes the conductor assembly, the insulation layer wraps the conductor to ensure stable current transmission, the power line delivers power to the coal mining machine, the ground wire ensures electrical safety, the signal line transmits control signals, and the layered arrangement with the power line reduces crosstalk. The shielding wire reduces interference and improves signal stability. Overall, the cable ensures stable operation in complex underground environments and meets the operational needs of the coal mining machine.

[0010] As a further description of the above technical solution:

[0011] The sheath assembly includes an outer sheath layer, a reinforcing layer fixedly connected inside the outer sheath layer, an outer wrapping layer fixedly connected inside the reinforcing layer, a shielding layer fixedly connected inside the outer wrapping layer, an inner wrapping layer fixedly connected inside the shielding layer, and multiple hollow rubber hoses fixedly connected inside the outer sheath layer.

[0012] Through the above technical solutions, the outer sheath layer, with its flame-retardant and anti-static properties, reduces the risk of downhole fires and static electricity, while resisting external corrosion. The reinforcing layer enhances mechanical strength to cope with external pulling forces when the cable is moved. The outer wrapping layer protects the internal structure and assists in shielding. The shielding layer reduces electromagnetic interference and ensures signal transmission. The inner wrapping layer isolates and protects the internal circuitry. The hollow rubber hose provides cushioning and reduces interlayer friction and compression, thus improving the overall stability and durability of the cable in complex downhole environments.

[0013] As a further description of the above technical solution:

[0014] The external parts of the plurality of hollow rubber hoses are fixedly connected to the interior of the reinforcing layer, and the adjacent sides of the plurality of hollow rubber hoses are fixedly connected to the interior of the inner wrapping layer.

[0015] The above technical solution achieves buffer protection for the internal structure of the cable. Inside the reinforcing layer, it provides buffer space for structural deformation when the cable is bent or twisted, reducing the risk of damage to the reinforcing layer and internal structure due to stress concentration. Inside the inner wrapping layer, it can prevent damage to the internal conductor components due to mutual squeezing and friction, enhance the stability of the internal structure of the cable under complex working conditions, and improve the overall durability of the cable.

[0016] As a further description of the above technical solution:

[0017] The external parts of the plurality of hollow rubber hoses are fixedly connected to the inside of the outer wrapping layer, and the external parts of the plurality of hollow rubber hoses are fixedly connected to the inside of the shielding layer.

[0018] Through the above technical solution, multiple hollow rubber hoses are fixedly connected inside the outer sheath and the shielding layer, which can form a buffer between the two layers. When the cable is bent or twisted by external forces, it can alleviate the friction and stress between the outer sheath and the shielding layer, avoid wear caused by mutual friction, reduce structural damage caused by stress concentration, and improve the structural stability and reliability of the cable under complex working conditions.

[0019] As a further description of the above technical solution:

[0020] The outer side of the filling layer is fixedly connected to the inner wall of the inner wrapping layer, and the outer side of the ground wire is in contact with the outer side of the signal line.

[0021] Through the above technical solution, the filling layer is fixed to the inner wall of the inner wrapping layer, which provides support and stability for the internal conductor assembly, ensuring the stability of each component. At the same time, it helps to isolate the circuit, and the ground wire is in contact with the external part of the signal line, so that the ground wire can introduce leakage current into the ground in time, creating a safe environment for the transmission of control signals and ensuring the accuracy and stability of signal transmission.

[0022] As a further description of the above technical solution:

[0023] The outside of the signal line is in contact with the outside of the shielding line, and the outside of the ground line is in contact with the outside of the power line.

[0024] Through the above technical solution, the signal line is in external contact with the shielding wire. By taking advantage of the fact that the shielding wire is grounded at both ends and the grounding resistance is ≤4Ω, common-mode interference can be effectively reduced, which greatly improves the accuracy and stability of the signal line in transmitting control signals. The ground wire is in external contact with the power line, which can promptly guide the abnormal current generated by the power line to the ground in the event of an electrical fault, ensuring the safety of equipment and personnel and avoiding electrical accidents.

[0025] As a further description of the above technical solution:

[0026] The power lines and signal lines are arranged in separate layers with a spacing of ≥10mm to reduce crosstalk.

[0027] Through the above technical solution, the power line and signal line are arranged in a layered and isolated manner with a spacing of ≥10mm. This effectively reduces the crosstalk of electromagnetic interference generated during power line transmission to the signal line, avoids interference of the strong electrical signal of the power line to the weak electrical control signal transmitted by the signal line, and ensures that the control signal can be accurately transmitted to each actuator of the coal mining machine, so that the coal mining machine can operate precisely according to the predetermined instructions, thereby improving the stability and reliability of coal mining operations.

[0028] As a further description of the above technical solution:

[0029] The shielding wire is grounded at both ends with a grounding resistance ≤ 4Ω to reduce common-mode interference. The surface resistance of the outer sheath is ≤ 1×10⁻⁶. 8 Ω.

[0030] Through the above technical solution, with both ends of the shielded cable grounded and the grounding resistance ≤4Ω, common-mode interference current can be effectively introduced into the ground, significantly reducing the impact of common-mode interference on the internal signal transmission of the cable, ensuring accurate and stable transmission of control signals, and the surface resistance of the outer sheath ≤1×10⁻⁶. 8 Ω, meeting mining cable standards, provides the outer sheath with antistatic properties, preventing static electricity accumulation from causing safety accidents. At the same time, in the complex underground environment, it can better adapt to the possible static electricity environment, ensuring the safe operation of the cable.

[0031] This utility model has the following beneficial effects:

[0032] 1. In this utility model, a double-layer shielding structure of "copper wire braid + aluminum-plastic composite tape" is adopted. The copper wire braid layer can effectively shield external electromagnetic interference, while the aluminum-plastic composite tape further enhances the shielding effect and reduces the interference of inverter harmonics on control signals. The power line and signal line are arranged in layers with a spacing of ≥10mm. Through this physical isolation method, the crosstalk of electromagnetic interference generated during power line transmission to signal lines is effectively reduced, ensuring accurate transmission of control signals. When the cable temperature rises abnormally, the inverter can be stopped in conjunction with the cable to avoid failure or fire caused by cable overheating.

[0033] 2. In this utility model, the outer sheath layer is made of high-strength, high-wear-resistant high-quality rubber, which can resist moisture, coal dust and rock friction and prevent damage to the outer sheath; the reinforcing layer can enhance the overall mechanical strength of the cable and cope with the pulling when the coal mining machine moves frequently; the outer wrapping layer further protects the internal structure and improves the protective performance; the shielding layer ensures the stable and safe operation of the cable in the complex underground environment. Attached Figure Description

[0034] Figure 1This is a three-dimensional schematic diagram of the frequency conversion cable for a coal mining machine proposed in this utility model;

[0035] Figure 2 This is a schematic diagram of the protective component structure of the frequency conversion cable for a mining coal mining machine proposed in this utility model;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0037] Figure 4 This is a schematic diagram of the filling layer structure of the frequency conversion cable for a coal mining machine proposed in this utility model;

[0038] Figure 5 for Figure 4 Enlarged view of point B in the image.

[0039] Legend:

[0040] 1. Sheath assembly; 11. Outer sheath layer; 12. Reinforcing layer; 13. Outer wrapping layer; 14. Shielding layer; 15. Inner wrapping layer; 16. Hollow rubber hose; 2. Filling layer; 3. Wire assembly; 31. Conductor; 32. Insulation layer; 33. Power line; 34. Ground wire; 35. Signal line; 36. Shielded wire. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Reference Figures 1 to 3 An embodiment of this utility model is provided: a frequency conversion cable for a coal mining machine, including a sheath assembly 1, a filling layer 2 fixedly connected inside the sheath assembly 1, and a conductor assembly 3 fixedly connected inside the filling layer 2;

[0043] The conductor assembly 3 includes multiple insulating layers 32, each of which is fixedly connected to the outside of a filling layer 2. A conductor 31 is fixedly connected inside each insulating layer 32, and the conductor 31 is encased in the insulating layer 32. The insulating layer 32, fixed within the filling layer 2, prevents leakage from the conductor 31, ensuring stable current transmission within the conductor 31. Multiple power lines 33 are fixedly connected inside the filling layer 2, transmitting the electrical energy required for the coal mining machine's operation. Multiple ground wires 34 are fixedly connected inside the filling layer 2, used for grounding to ensure electrical safety. Multiple signal lines 35 are fixedly connected inside the cable. The signal lines 35 transmit control signals and are arranged in a layered, isolated manner from the power lines 33, with a spacing of ≥10mm to reduce crosstalk. Multiple shielded wires 36 are fixedly connected inside the filling layer 2. The two ends of the shielded wires 36 are grounded, and the grounding resistance is ≤4Ω to reduce common-mode interference and improve signal transmission stability. Built-in temperature sensors (spaced 20 meters apart) monitor cable overheating in real time and trigger the inverter to stop. The cable passes the power frequency withstand voltage test (11kV / 5min), partial discharge quantity ≤10pC, and bending test (bending radius ≥8D, no cracks after 1000 cycles).

[0044] Specifically, this system achieves efficient, safe, and stable operation of the coal mining machine under complex working conditions. Multiple insulation layers 32 tightly wrap the conductor 31, while its exterior is firmly connected to the filling layer 2, ensuring stable current transmission within the conductor 31, preventing leakage, and guaranteeing the safety of power transmission. Multiple power lines 33 are fixed inside the filling layer 2, continuously supplying the coal mining machine with the power required for operation, meeting the power demands of the equipment. The ground wire 34 effectively guides leakage current through grounding, constructing an electrical safety barrier for the entire cable system and related equipment. The signal line 35 bears the important responsibility of transmitting control signals, maintaining a layered isolation distance of ≥10mm from the power line 33, greatly reducing crosstalk caused by electromagnetic interference generated during power line transmission, ensuring accurate transmission of control signals, and achieving precise control of the coal mining machine. Multiple shielded wires 36 are grounded at both ends with a grounding resistance ≤4Ω, effectively reducing common-mode interference, further improving the stability of signal transmission, and ensuring the reliability of signals in complex electromagnetic environments.

[0045] Reference Figures 1 to 3 The sheath assembly 1 includes an outer sheath layer 11, which is typically made of rubber material with added flame retardants and antistatic carbon black. Function: The flame retardant gives the outer sheath layer flame-retardant properties, effectively preventing the spread of fire and reducing safety risks in environments where flammable and explosive gases may exist downhole, should an ignition source be encountered. The antistatic carbon black imparts antistatic properties to the outer sheath layer, with a surface resistivity ≤1×10⁻⁶. 8Ω, meeting the MT818-2009 mining cable standard, can prevent safety accidents caused by static electricity accumulation. At the same time, the rubber material itself has good flexibility and wear resistance, and can resist the corrosion of the cable by harsh environments such as underground moisture, coal dust and rock friction. The inner fixed connection of the outer sheath layer 11 is a reinforcing layer 12. The reinforcing layer 12 is generally made of high-strength fiber braid, such as aramid fiber. Aramid fiber has extremely high strength and modulus. Making it into a reinforcing layer can significantly enhance the overall mechanical strength of the cable. During the frequent movement of the coal mining machine, the cable is subjected to various pulling and dragging forces. The reinforcing layer can effectively resist these external forces, preventing the cable from breaking, deforming, or being damaged due to stress, ensuring stable operation of the cable under complex working conditions, and extending the cable's service life. The reinforcing layer 12 is internally fixedly connected to an outer wrapping layer 13. The outer wrapping layer 13 is commonly made of insulating materials such as polyester tape. Polyester tape has good insulation and mechanical properties. The outer wrapping layer is wrapped inside the reinforcing layer, which on the one hand can further protect the internal shielding layer and other structures from external mechanical damage and reduce the impact of friction on the internal structure; on the other hand, its insulation properties help prevent external electromagnetic interference from being conducted to the interior through the reinforcing layer, playing an auxiliary shielding and insulation role and improving the overall protection performance of the cable. The outer wrapping layer 13 is internally fixedly connected to a shielding layer 14. The inner layer of the shielding layer 14 is made of aluminum-plastic composite tape, and the outer layer is made of copper wire braid. The aluminum-plastic composite tape is longitudinally wrapped to form the inner shielding layer. Its aluminum layer can effectively shield external low-frequency electromagnetic interference, and the overlap rate is ≥20%, ensuring the integrity of the shielding layer.

[0046] The outer copper wire is braided at a 45° angle, which has a good shielding effect against high-frequency electromagnetic interference. Through the double-layer shielding structure, the impact of external electromagnetic interference on the internal signal transmission of the cable is greatly reduced, especially the interference of inverter harmonics on control signals, ensuring accurate and stable signal transmission in complex electromagnetic environments. The shielding layer 14 is fixedly connected to the inner wrapping layer 15. The inner wrapping layer 15 is usually made of insulating materials such as polypropylene tape. Polypropylene tape has good flexibility and insulation performance. The inner wrapping layer is located inside the shielding layer and mainly plays the role of protecting the internal conductor assembly. It can isolate the shielding layer from the internal filling layer, conductor assembly, etc., prevent the shielding layer from rubbing against the internal structure during operation, and avoid the static electricity or mechanical damage caused by friction affecting the normal operation of the internal circuit of the cable. At the same time, it further enhances the insulation performance of the cable. Multiple hollow rubber hoses 16 are fixedly connected inside the outer sheath layer 11.

[0047] Specifically, it achieves comprehensive protection and performance enhancement for the frequency conversion cable of the mining coal mining machine. The outer sheath layer 11, with the addition of flame retardants and antistatic carbon black rubber materials, achieves flame retardancy, antistatic properties, and resistance to harsh environmental corrosion, reducing underground safety risks. The reinforcing layer 12, with high-strength aramid fiber braiding, enhances the mechanical strength of the cable, effectively coping with the pulling and dragging forces during coal mining machine operation, ensuring stable cable operation and extending service life. The outer wrapping layer 13 utilizes the insulation and mechanical properties of polyester tape to further protect the internal structure and assist in shielding external interference. The shielding layer 14, with its aluminum-plastic composite tape and copper wire braided double-layer structure, greatly reduces external electromagnetic interference and ensures accurate signal transmission. The inner wrapping layer 15 uses polypropylene tape to protect the internal conductor components and enhance insulation performance. The multiple hollow rubber hoses 16 inside the outer sheath layer 11 act as buffers, reducing friction and compression between the layers. It comprehensively ensures the cable operates stably, safely, and efficiently in complex underground environments and under frequent coal mining machine movement conditions, providing a solid guarantee for the normal operation of the coal mining machine.

[0048] Reference Figures 1 to 3 Multiple hollow rubber hoses 16 are distributed at key locations inside the cable. Their exteriors are tightly fixed to the interior of the reinforcing layer 12, utilizing their flexibility to provide cushioning for the reinforcing layer 12 and prevent excessive compression and friction between internal structures when the cable is bent or twisted. The adjacent sides of the multiple hollow rubber hoses 16 are fixedly connected to the interior of the inner sheath 15, providing additional protection for the internal conductor components and preventing damage from direct contact with the internal structures. Simultaneously, the exteriors of the multiple hollow rubber hoses 16 are also fixedly connected to the exterior sheath 13 and the shielding layer 14, further enhancing the cushioning effect between layers and improving the overall mechanical stability of the cable. The exterior of the filler layer 2 is firmly fixed to the inner wall of the inner sheath 15. The filler layer 2 not only fills the internal space of the cable, ensuring the stability of each component, but also helps to isolate different lines, including the exterior of the ground wire 34 and the signal line 35. The signal line 35 is in contact with the external shielding wire 36, which effectively conducts leakage current from electrical equipment to the ground, ensuring safe signal transmission. The external shielding wire 36 is also in contact with the external shielding wire 36, with both ends of the shielding wire 36 grounded. The grounding resistance is ≤4Ω, greatly reducing common-mode interference and improving the accuracy and stability of control signal transmission from the signal line 35. The external shielding wire 34 is in contact with the external power line 33, which provides power to the coal mining machine. By contacting the grounding wire 34, abnormal current can be promptly conducted to the ground in case of an electrical fault, ensuring equipment safety. It is particularly important that the power line 33 and signal line 35 are arranged in a layered isolation configuration with a spacing ≥10mm. This physical isolation effectively reduces electromagnetic interference generated during power line 33 transmission, preventing crosstalk to the signal line 35 and ensuring accurate control signal transmission. Furthermore, the surface resistance of the outer sheath layer 11 is ≤1×10⁻⁶. 8Ω, meeting the MT818-2009 mining cable standard, with added flame retardants and antistatic carbon black, giving it flame retardant and antistatic properties in flammable and explosive underground environments, effectively preventing the spread of fire and safety accidents caused by static electricity;

[0049] Specifically, it enables the safe and stable operation of the frequency conversion cable of the mining coal mining machine in complex underground environments and frequent moving conditions. The hollow rubber hose 16 is distributed between the reinforcing layer 12, the outer wrapping layer 13, the shielding layer 14 and the inner wrapping layer 15, providing buffering, enhancing mechanical stability, reducing the risk of damage to the internal structure, and the filling layer 2 stabilizes the components and helps isolate the line. The contact and connection between ground wire 34, signal wire 35, shield wire 36, and power wire 33 ensure electrical safety, reduce interference, and improve signal transmission accuracy. Power wire 33 and signal wire 35 are isolated in layers to reduce crosstalk. The flame-retardant and anti-static properties of the outer sheath layer 11 prevent fire and electrostatic accidents, ensuring reliable cable operation in all aspects and providing strong support for the normal operation of the coal mining machine. Explosion-proof junction boxes (compliant with GB3836.2 standard) must be used at cable joints to prevent gas ignition. If the sheath is damaged, the machine must be stopped immediately and the damaged parts replaced. Live operation is strictly prohibited. When the temperature is detected to be >90°C, the frequency converter will automatically trigger an emergency shutdown and alarm. The cable overload protection threshold is set to 1.2 times the rated current, with a response time ≤0.1s.

[0050] Working Principle: Inside the sheath assembly 1, the filling layer 2 provides support and isolation. The conductor assembly 3, fixedly connected within it, handles power and signal transmission. In the conductor assembly 3, the conductor 31 is wrapped by an insulation layer 32. Multiple insulation layers 32 are fixed within the filling layer 2, ensuring stable current transmission in the conductor 31 and preventing leakage. The power line 33 transmits the electrical energy required for the coal mining machine. It is arranged in a layered, isolated manner from the signal line 35, with a spacing ≥10mm, greatly reducing crosstalk and ensuring accurate transmission of control signals. The ground wire 34 is used for grounding, ensuring electrical safety. The shielded wire 36 is grounded at both ends, with a grounding resistance ≤4Ω8, effectively reducing common-mode interference. It contacts the signal line 35, further improving signal transmission stability. In the sheath assembly 1, the outer sheath layer 11 provides external protection, with a surface resistance ≤1×10⁻⁶. 8 Ω8, meeting mining cable standards, possessing flame-retardant and anti-static properties; Reinforcing layer 12 enhances the overall mechanical strength of the cable; Outer wrapping layer 13 and inner wrapping layer 15 further protect the internal structure; Shielding layer 14 reduces the impact of external electromagnetic interference on the internal signals of the cable; Hollow rubber hose 16 is distributed between reinforcing layer 12, outer wrapping layer 13, shielding layer 14 and inner wrapping layer 15, playing a role in buffering and protecting the internal circuitry, enabling the cable to better adapt to the complex underground environment and the frequent movement of coal mining machines.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A frequency conversion cable for a mining machine, comprising a jacket assembly (1), characterized in that: The inner part of the sheath assembly (1) is fixedly connected with a filling layer (2), and the inner part of the filling layer (2) is fixedly connected with a wire assembly (3); The wire assembly (3) comprises a plurality of insulating layers (32), the outer part of each of the plurality of insulating layers (32) is fixedly connected to the inner part of the filling layer (2), the inner part of the insulating layer (32) is fixedly connected with a conductor (31), the inner part of the filling layer (2) is fixedly connected with a plurality of power lines (33), the inner part of the filling layer (2) is fixedly connected with a plurality of ground wires (34), the inner part of the filling layer (2) is fixedly connected with a plurality of signal lines (35), and the inner part of the filling layer (2) is fixedly connected with a plurality of shielding lines (36).

2. A mine duty shearer frequency cable as claimed in claim 1, characterised in that: The sheath assembly (1) comprises an outer sheath layer (11), the inner part of the outer sheath layer (11) is fixedly connected with a reinforcing layer (12), the inner part of the reinforcing layer (12) is fixedly connected with an outer wrapping layer (13), the inner part of the outer wrapping layer (13) is fixedly connected with a shielding layer (14), the inner part of the shielding layer (14) is fixedly connected with an inner wrapping layer (15), and the inner part of the outer sheath layer (11) is fixedly connected with a plurality of hollow rubber hoses (16).

3. A mine duty shearer frequency cable according to claim 2 characterised in that: The outer part of each of the plurality of hollow rubber hoses (16) is fixedly connected to the inner part of the reinforcing layer (12), and the proximal side of each of the plurality of hollow rubber hoses (16) is fixedly connected to the inner part of the inner wrapping layer (15).

4. The mine duty longwall cable of claim 2, wherein: The outer part of each of the plurality of hollow rubber hoses (16) is fixedly connected to the inner part of the outer wrapping layer (13), and the outer part of each of the plurality of hollow rubber hoses (16) is fixedly connected to the inner part of the shielding layer (14).

5. The mine-duty longwall cable of claim 2, wherein: The outer part of the filling layer (2) is fixedly connected to the inner wall of the inner wrapping layer (15), and the outer part of the ground wire (34) is in contact with the outer part of the signal line (35).

6. The mine-duty longwall cable of claim 1, wherein: The outer part of the signal line (35) is in contact with the outer part of the shielding line (36), and the outer part of the ground wire (34) is in contact with the outer part of the power line (33).

7. The mine-duty longwall cable of claim 1, wherein: The power line (33) and the signal line (35) are arranged in a layered and isolated manner, and the distance is greater than or equal to 10 mm, so as to reduce crosstalk.

8. The mine duty conveyor belt drive cable of claim 2, wherein: The shielded wire (36) is grounded at both ends, and the ground resistance is less than or equal to 4Q, the common mode interference is reduced, and the surface resistance of the outer sheath layer (11) is less than or equal to 1x10 8 Ω.

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