Fireproof tensile mining power cable

Abstract

The utility model relates to the technical field of mining power cables, in particular to a fireproof tensile mining power cable, which comprises a plurality of groups of core wires and wire sheaths, the core wire comprises a conductor and a protective layer wrapping the conductor, the protective layer is provided with an internal fire insulation layer and an insulating layer, the conductor is wrapped by the internal fire insulation layer, and the internal fire insulation layer is wrapped by the insulating layer; the wire protection sleeve comprises a stretching layer, an external fire insulation layer and a filler layer, the filler layer is used for filling gaps among the core wires, the external fire insulation layer wraps the filler layer, the stretching layer wraps the external fire insulation layer and is provided with a plurality of steel wire bearing parts for accommodating stranded steel wires, the steel wire bearing parts protrude out of the peripheral surface of the stretching layer, and both the internal fire insulation layer and the external fire insulation layer are made of fire-resistant materials. According to the invention, the tensile performance of the cable is improved, the fireproof capability is enhanced, and the safety requirement of the cable in a complex mine environment is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mining power cable, in particular to a fireproof and tensile mining power cable. BACKGROUND

[0002] The mining cable is a very important connecting link of equipment in the coal mining industry, and its safety and performance requirements are extremely strict. The mine environment is complex and changeable, and there are various chemical substances and harsh gases, so the corrosion resistance of the cable is extremely high.

[0003] Due to the narrow space in the mine and the existence of flammable and explosive gases such as gas, when the cable is concentratedly laid, the probability of cable failure causing fire is increased, and the fire is easy to spread between the cables. When the cable fire may cause secondary disasters such as gas explosion and dust explosion, so the cable needs to have good fireproof performance. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to overcome the above technical problems, and provide a fireproof and tensile mining power cable.

[0005] A fireproof and tensile mining power cable comprises:

[0006] A plurality of core wires comprising a conductor and a protective layer covering the conductor, the protective layer comprising an internal fire barrier layer and an insulating layer, the internal fire barrier layer covering the conductor, and the insulating layer covering the internal fire barrier layer, and

[0007] A wire sheath comprising a tensile layer, an external fire barrier layer and a filler layer, the filler layer filling the gaps between the core wires, the external fire barrier layer covering the filler layer, and the tensile layer covering the outer peripheral surface of the external fire barrier layer, the tensile layer comprising a plurality of steel wire bearing portions accommodating twisted steel cables, the steel wire bearing portions protruding from the outer peripheral surface of the tensile layer, and the internal fire barrier layer and the external fire barrier layer both being made of fire-resistant material.

[0008] By adopting the above scheme, the internal fire barrier layer and the external fire barrier layer simultaneously have the effect of preventing fire on the cable, and by providing the steel wire bearing portions accommodating twisted steel cables in the tensile layer, the twisted steel cables can improve the tensile resistance of the cable. At the same time, the steel wire bearing portions protrude from the outer peripheral surface of the tensile layer, which can effectively prevent the cable from being knotted. If the twisted steel cable abnormally deforms or breaks, it indicates that the cable is subjected to abnormal external force or has potential problems at that position, which facilitates maintenance personnel to locate the damaged position.

[0009] In one embodiment, the extended end of the twisted steel cable is fixedly provided with a traction member, and the traction member protrudes from the extended end of the steel wire bearing portion.

[0010] Through the above scheme, when the cable is laid, the cable needs to be pulled from a low position to a high position, and the cable is subjected to tension in the process, the traction member is provided, and the traction member at both ends of the stranded steel cable can be directly pulled by the construction personnel, so that the overhead cable is pulled and installed, and the stranded steel cable plays a guiding role on the cable, and the tension of the cable is concentrated on the stranded steel cable, so that the stress of the cable is effectively reduced.

[0011] In one of the embodiments, the traction member comprises a mounting sleeve and a screwing sleeve, the mounting sleeve comprises an abutting rib and a contraction part, the abutting rib is in abutment with the extended end of the steel wire bearing part, the contraction part is funnel-shaped, the screwing sleeve comprises a contraction gap, the inner wall surface of the screwing sleeve is in contact with the stranded steel cable, and the outer peripheral surface of the screwing sleeve is provided with a rotating rib which is in threaded connection with the contraction part, and the width of the contraction gap can be changed when the screwing sleeve moves along the contraction part.

[0012] Through the above scheme, when the traction member is pulled, the abutting rib is in abutment with the extended end of the steel wire bearing part, so that the wire protection sleeve is prevented from sliding relative to the traction member, the screwing sleeve is moved along the contraction part, and the width of the contraction gap can be changed, when the contraction gap is narrower, the screwing sleeve is more closely connected with the stranded steel cable, so that relative sliding between the stranded steel cable and the traction member is prevented.

[0013] In one of the embodiments, the wire protection sleeve further comprises a reflective layer, the reflective layer covers the stretching layer, and the reflective layer is made of a reflective material.

[0014] Through the above scheme, due to the complex environment and dim light in the mine, the cable is easily miscontacted or misexcavated in the process of construction and inspection, and a safety accident or power failure is caused, the reflective layer is arranged on the outer peripheral surface of the wire protection sleeve, and the staff can more easily identify the position of the cable.

[0015] In one of the embodiments, the reflective layer comprises a glue covering layer and a reflective medium, the glue covering layer covers the stretching layer, and the reflective medium is located between the glue covering layer and the stretching layer.

[0016] Through the above scheme, the glue covering layer has a fixing and protecting effect on the reflective medium, and the reflective medium is prevented from falling off from the outer peripheral surface of the stretching layer.

[0017] In one of the embodiments, a thermochromic material is filled between the glue covering layer and the stretching layer.

[0018] Through the above scheme, when the temperature of the cable changes, the color of the thermochromic material also changes, and the staff can judge the temperature of the cable according to the color change of the thermochromic material.

[0019] In one of the embodiments, the reflective medium is in the form of particles and protrudes from the outer circumferential surface of the rubber coating layer.

[0020] By using the above scheme, the reflective medium protrudes from the surface of the rubber coating layer, which can prevent the rubber coating layer and the stretching layer from being rubbed by the external environment, thereby enhancing the wear resistance of the cable.

[0021] In one of the embodiments, the protective layer further comprises a water-blocking belt, and the water-blocking belt covers the conductor, and the inner fireproof layer covers the water-blocking belt.

[0022] By using the above scheme, since the environment in the mine is humid, the water-blocking belt is arranged to prevent the cable from entering water in a humid environment.

[0023] In one of the embodiments, the water-blocking belt is made of elastic material and filled with expansion water-blocking powder.

[0024] By using the above scheme, the water-blocking belt has a water-blocking effect and also has a buffering effect.

[0025] In one of the embodiments, the inner fireproof layer and the outer fireproof layer each comprise multiple layers and are made of porcelainized silicone rubber material.

[0026] By using the above scheme, the porcelainized silicone rubber material has a high temperature resistance level and also has low temperature resistance performance. At a temperature of 550-3100 DEG C, the porcelainized silicone rubber material is rapidly burned into a ceramic hard and complete shell. The hard shell after combustion provides good protection for the line, ensuring the smoothness of the line in the case of fire.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The water-blocking belt can prevent water from entering the cable, the inner fireproof layer and the outer fireproof layer have a water-blocking effect on the cable, the steel wire bearing part for accommodating the stranded steel cable is arranged on the stretching layer, the stranded steel cable can improve the tensile resistance of the cable, the steel wire bearing part protrudes from the outer circumferential surface of the stretching layer, which can effectively prevent the cable from being knotted, and if the stranded steel cable abnormally deforms or breaks, it indicates that the cable is subjected to abnormal external force or has a potential problem, which facilitates the maintenance personnel to locate the damaged position.

[0029] 2. During the operation of the mine, the cable needs to be pulled from a low place to a high place during the laying process. In this process, the cable will be subjected to tension. By arranging the traction member, the construction personnel can directly pull the traction members at both ends of the stranded steel cable, thereby installing the overhead cable. At this time, the stranded steel cable plays a guiding role on the cable, and the tension on the cable is concentrated on the stranded steel cable, thereby effectively reducing the stress on the cable.

[0030] 3. Due to the complex environment and dim light in the mine, it is easy to mis-touch and mis-dig the cable during construction, inspection and other processes, causing safety accidents or power failure. By arranging the reflective layer on the outer circumferential surface of the wire sleeve, the staff can more easily identify the location of the cable. At the same time, the reflective medium is designed as a granular shape protruding from the rubber coating layer. The reflective medium can not only reflect light but also prevent the rubber coating layer and the stretching layer from being rubbed by the outside world, thereby enhancing the wear resistance of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural diagram of a fireproof and anti-tension mine power cable provided by the present application.

[0032] Figure 2 is a cross-sectional view of a fireproof and anti-tension mine power cable provided by the present application.

[0033] Figure 3 is a cross-sectional view of a traction member.

[0034] BRIEF DESCRIPTION OF DRAWINGS: 1, core wire; 11, conductor; 12, protective layer; 121, internal fire barrier layer; 122, insulating layer; 123, water-blocking tape; 2, wire sleeve; 21, stretching layer; 211, steel wire bearing part; 2111, stranded steel cable; 22, external fire barrier layer; 23, filler layer; 24, reflective layer; 241, rubber coating layer; 242, reflective medium; 3, traction member; 31, mounting sleeve; 311, stop edge; 312, contraction part; 32, tightening sleeve; 321, contraction gap; 322, rotating edge. DETAILED DESCRIPTION

[0035] Therefore, it is necessary to provide a fireproof and anti-tension mine power cable that can effectively prevent fire.

[0036] A fireproof and anti-tension mine power cable provided by the present application, please refer to Figures 1-2 , Figure 1 A fireproof and anti-tension mine power cable provided by the present application, comprising a plurality of core wires 1 and a wire sleeve 2 covering the core wires 1.

[0037] The core wire 1 comprises a conductor 11 and an internal fire barrier layer 121 covering the conductor 11. The middle part of the conductor 11 is a circular single tin-plated copper wire. The periphery of the circular tin-plated copper wire is covered with a plurality of tin-plated copper conductors 11 with a Z-shaped cross section. The long-section cable conductor 11 can achieve 1%-2.5% energy saving and consumption reduction advantage, and this conductor 11 structure is stable, has small bending radius, is not easy to oxidize, has good conductivity, and has long service life.

[0038] The protective layer 12 comprises an internal fire barrier layer 121, a water blocking belt 123 and an insulating layer 122. The internal fire barrier layer 121 serves as the first line of defense close to the conductor 11 and is made of a material with good heat insulation properties and capable of maintaining a stable state under high temperature conditions, such as ceramic fiber cloth or multi-layer ceramic silicon rubber material. In this application, the internal fire barrier layer 121 is made of multi-layer ceramic silicon rubber material, which has high temperature resistance and low temperature resistance. At a temperature of 550-3100°C, it is quickly burned into a ceramic hard and complete shell, which provides good protection for the cable and ensures smooth operation of the cable in case of fire.

[0039] The periphery of the internal fire barrier layer 121 is extruded with an insulating layer 122 for insulation. The insulating layer 122 can be made of common insulating materials such as polyethylene or cross-linked polyethylene. In this application, the insulating layer 122 is made of polypropylene material. The insulating thickness meets the requirements of MT818 standard. This material has chemical stability, stress cracking resistance and good light transmittance. In addition, this material has good extrusion processability, which can also improve production efficiency. A water blocking belt 123 is added inside the internal fire barrier layer 121. The water blocking belt 123 is made of elastic material and filled with expansion water blocking powder, which can absorb water in a humid environment and quickly expand to block the leakage channel, preventing water from entering the core area and causing short circuit risk. The water blocking belt 123 can be made of high molecular foam materials such as polyurethane foam or polyethylene foam. During processing, the expansion water blocking powder is evenly applied to the outer surface of the water blocking belt 123, so that the water blocking belt 123 can not only play a buffering role but also have a waterproof effect. The water blocking belt 123 can also be filled with rubber material or fiber fabric material filled with expansion water blocking powder, which can also play a role in water blocking and buffering.

[0040] The cable protection sleeve 2 comprises a stretch layer 21, an external fire barrier layer 22 and a filler layer 23. The filler layer 23 fills the gap between the multiple groups of core wires 1 to prevent mutual extrusion between the multiple groups of core wires 1. The filler layer 23 is made of chlorinated polyethylene filler strip. The external fire barrier layer 22 is also made of ceramic silicon rubber material, and after the filler layer 23 fills the multiple groups of core wires 1, the cable wrapping belt is wrapped with three layers of ceramic silicon rubber belt with a covering rate of 15-20%. This structure design effectively improves the burning performance and flame retardant performance of the product, so as to better adapt to the mine environment, reduce the replacement frequency of the cable and the accident rate caused by the cable.

[0041] In the present application, the tensile layer 21 comprises a plurality of steel wire carrying parts 211 accommodating the stranded steel cable 2111, each steel wire carrying part 211 is stranded by a plurality of stranded soft steel wires, the tensile layer 21 and the stranded steel cable 2111 are extruded by a special customized mold, the steel wire carrying part 211 protrudes from the outer circumferential surface of the tensile layer 21, so as to avoid the cable from knotting during use, and if the stranded steel cable 2111 abnormally deforms or breaks, it indicates that the cable is subjected to abnormal external force or has potential problems at this part, so as to facilitate the maintenance personnel to locate the damage position.

[0042] Please refer to Figure 3 , Figure 3 The traction member 3 is fixed at the extended end of the stranded steel cable 2111, the traction member 3 protrudes from the extended end of the steel wire carrying part 211, the traction member 3 comprises a mounting sleeve 31 and a screwing sleeve 32, the mounting sleeve 31 and the metal sleeve are both made of metal material, the mounting sleeve 31 comprises a stopper edge 311 and a contraction part 312, the stopper edge 311 abuts against the extended end of the steel wire carrying part 211, the screwing sleeve 32 comprises a contraction gap 321 and the inner wall surface thereof can contact the stranded steel cable 2111, the outer circumferential surface of the screwing sleeve 32 is provided with a rotating edge 322, the rotating edge 322 is provided with external threads, the contraction part 312 is provided with internal threads matched with the external threads, the screwing sleeve 32 can move along the contraction part 312 during rotation, the contraction part 312 is funnel-shaped, so that the inner diameter of the screwing sleeve 32 changes during movement in the contraction part 312, the width of the contraction gap 321 also changes, when the screwing sleeve 32 moves in the direction of contraction of the contraction part 312, the contraction gap 321 becomes narrower, the screwing sleeve 32 is connected more tightly with the stranded steel cable 2111, when the screwing sleeve 32 moves in the direction of the entrance of the contraction part 312, the contraction gap 321 becomes looser, and the worker can disassemble the traction member 3 from the stranded steel cable 2111.

[0043] The end of the mounting sleeve 31 away from the stopper edge 311 can be provided with a pull ring, during the mine operation, the cable needs to be pulled from low to high during laying, the cable will be subjected to tension during this process, the worker can directly pull the pull ring, so as to pull and install the overhead cable, at this time, the stopper edge 311 abuts against the extended end of the steel wire carrying part 211, so as to prevent the wire sleeve 2 from sliding relative to the traction member 3, the stranded steel cable 2111 plays a guiding role on the cable, and the tension on the cable is concentrated on the stranded steel cable 2111, so as to effectively reduce the stress on the cable.

[0044] In the present application, the wire protection sleeve 2 further comprises a reflective layer 24, which comprises a glue covering layer 241 and a reflective medium 242. The glue covering layer 241 is a transparent adhesive covering the outer circumferential surface of the stretching layer 21, and the reflective medium 242 is located between the glue covering layer 241 and the stretching layer 21. In actual production, a layer of glue can be covered on the outer circumferential surface of the stretching layer 21, and then the reflective medium 242 is uniformly bonded on the outer circumferential surface of the stretching layer 21. At the same time, a powder-like thermochromic material such as a steroid phase liquid crystal or a spiropyran can be sprinkled on the surface of the stretching layer 21. Finally, the glue covering layer 241 is covered on the surface of the reflective medium 242, thereby fixing the reflective medium 242. Due to the complex and dim light environment in the mine, the cable is easy to be accidentally touched or dug during construction and inspection, which may cause safety accidents or power failure. By providing the reflective layer 24 on the outer circumferential surface of the wire protection sleeve 2, the staff can more easily identify the location of the cable. When the temperature of the cable changes, the color of the thermochromic material will also change, thereby making it convenient for the staff to monitor whether the temperature of the cable is normal.

[0045] The reflective medium 242 can be in sheet shape, granular shape, or ring shape. When the reflective medium 242 is in granular shape, the reflective medium 242 protrudes from the outer circumferential surface of the glue covering layer 241 and rubs against the outside, thereby improving the wear resistance of the cable and preventing the cable from being worn. In this case, the reflective medium 242 can be made of glass beads or other high-hardness metal oxides, which have excellent reflective properties and high wear resistance and are suitable for long-term use in harsh environments. When the reflective medium 242 is in sheet shape, the reflective surface of the reflective medium 242 is larger. The middle part of the reflective medium 242 can be designed in a bent spring shape. The bent part of the middle part of the reflective medium 242 can protrude from the outer circumferential surface of the glue covering layer 241, so that the reflective medium 242 has elasticity and can buffer the cable, and also has wear resistance. When the reflective medium 242 is in ring shape and is sleeved on the outer circumferential surface of the stretching layer 21, the reflective medium 242 can improve the extrusion resistance of the cable. The ring structure has protrusions extending outward from the glue covering layer 241, which can also have the effects of buffering and wear resistance while taking into account the reflective effect.

[0046] The working principle of the present application is as follows. The internal fireproof layer 121 and the external fireproof layer 22 are made of ceramicized silicone rubber, which makes the cable have good fireproof performance. The internal fireproof layer 121 and the external fireproof layer 22 form a hard and complete shell when they are burned, which protects the line and ensures the smoothness of the line in the case of fire. At the same time, the steel cable 2111 is used as armor, which can directly pull the steel cable 2111, thereby reducing the stress on the cable and improving the tensile strength of the cable. The reflective medium 242 is provided, so that the cable has reflective effect and good wear resistance.

[0047] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fire-resistant and tensile-strength mining power cable, characterized in that, include: Multiple sets of core wires (1), including conductors (11) and a protective layer (12) covering the conductors (11), the protective layer (12) including an inner fire-resistant layer (121) and an insulating layer (122), the inner fire-resistant layer (121) covering the conductors (11), the insulating layer (122) covering the inner fire-resistant layer (121), and The cable sheath (2) includes a tension layer (21), an outer fireproof layer (22), and a filler layer (23). The filler layer (23) fills the gaps between the core wires (1). The outer fireproof layer (22) covers the filler layer (23). The tension layer (21) covers the outer peripheral surface of the outer fireproof layer (22). The tension layer (21) includes a plurality of wire bearing portions (211) for accommodating stranded steel cables (2111). The wire bearing portions (211) protrude from the outer peripheral surface of the tension layer (21). Both the inner fireproof layer (121) and the outer fireproof layer (22) are made of fire-resistant material.

2. The fire-resistant and tensile-strength mining power cable according to claim 1, characterized in that: The extension end of the stranded steel cable (2111) is fixed with a traction member (3), which protrudes from the extension end of the wire bearing part (211).

3. A fire-resistant and tensile-strength mining power cable according to claim 2, characterized in that: The traction component (3) includes an mounting sleeve (31) and a tightening sleeve (32). The mounting sleeve (31) includes a stop edge (311) that abuts against the extended end of the wire bearing part (211) and a contraction part (312). The contraction part (312) is funnel-shaped. The tightening sleeve (32) includes a contraction notch (321). The inner wall surface of the tightening sleeve (32) contacts the stranded steel cable (2111). The outer peripheral surface of the tightening sleeve (32) is provided with a rotating edge (322) that is threadedly connected to the contraction part (312). When the tightening sleeve (32) moves along the contraction part (312), the width of the contraction notch (321) can be changed.

4. A fire-resistant and tensile-strength mining power cable according to claim 1, characterized in that: The cable sheath (2) also includes a reflective layer (24), which covers the stretch layer (21) and is made of reflective material.

5. A fire-resistant and tensile-strength mining power cable according to claim 4, characterized in that: The reflective layer (24) includes an adhesive layer (241) and a reflective medium (242). The adhesive layer (241) covers the stretch layer (21), and the reflective medium (242) is located between the adhesive layer (241) and the stretch layer (21).

6. A fire-resistant and tensile-strength mining power cable according to claim 5, characterized in that: The adhesive layer (241) and the stretch layer (21) are filled with thermochromic material.

7. A fire-resistant and tensile-strength mining power cable according to claim 5, characterized in that: The reflective medium (242) is granular and protrudes from the outer peripheral surface of the adhesive layer (241).

8. A fire-resistant and tensile-strength mining power cable according to claim 1, characterized in that: The protective layer (12) further includes a water-blocking strip (123), which covers the conductor (11), and the inner fireproof layer (121) covers the water-blocking strip (123).

9. A fire-resistant and tensile-strength mining power cable according to claim 8, characterized in that: The water-blocking strip (123) is made of elastic material and filled with expanding water-blocking powder.

10. A fire-resistant and tensile-strength mining power cable according to claim 1, characterized in that: Both the internal fireproof layer (121) and the external fireproof layer (22) consist of multiple layers and are made of ceramicized silicone rubber.

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