Abrasion resistant power cable

Abstract

The utility model discloses a kind of wear-resistant power cable, including outer sheath, the equidistance distribution wear-resistant strip of outer sheath's circumferential outer wall is provided, the wear-resistant strip is set along outer sheath axial direction, equidistance distribution embedding hole is set up on the outer wall of wear-resistant strip away from outer sheath, embedding hole is embedded with ball, ball and the inner wall of embedding hole form rotating cooperation.The utility model passes through the polyurethane wear-resistant strip on outer sheath and its inside rotatable ball, sliding friction is converted into rolling friction, greatly improve wear resistance;Through the three-dimensional heat dissipation system formed by fan-shaped elastic heat-conducting bearing strip and center heat dissipation pipe, heat is efficiently exported;Triple braiding and armoring layer provide high-strength protection;Aluminum hydroxide flame-retardant filling layer effectively inhibits flame spread, comprehensively realizes the super-long life, high reliability and outstanding safety of cable.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a wear-resistant power cable. Background Technology

[0002] Power cables, as the core carrier of electrical energy transmission, are widely used in urban power grids, industrial and mining enterprises, power plants, and various harsh environments. The basic structure of traditional power cables includes a conductive core, an insulation layer, a shielding layer, and an outer sheath. However, in applications such as cable chain systems, robot joints, port machinery, and mining equipment, cables not only need to withstand frequent bending and torsion stresses, but also experience continuous friction and scraping with equipment, the ground, or other cables. This leads to rapid wear and tear and cracking of the outer sheath, potentially causing serious accidents such as insulation failure, short circuits, or even fires.

[0003] Currently, common methods to improve the abrasion resistance of cables mainly involve using abrasion-resistant materials such as polyurethane as the outer sheath or setting raised abrasion-resistant ribs. However, these methods still have significant limitations: First, even with continuous and high-intensity friction, the wear rate of abrasion-resistant materials remains high, resulting in a limited service life; second, friction generates a large amount of heat, and if this heat cannot be dissipated in time, it will accelerate material aging and reduce its mechanical and insulation properties; third, the internal structure of cables is prone to relative displacement and stress concentration during dynamic use, leading to damage to internal components; furthermore, the flame retardancy and impact resistance of existing cables are often difficult to balance with abrasion resistance and thermal conductivity.

[0004] Therefore, there is an urgent need for a power cable that integrates excellent wear resistance, efficient thermal conductivity and heat dissipation, superior flame retardancy and high mechanical strength to meet the increasingly demanding requirements of industrial applications. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a wear-resistant power cable.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wear-resistant power cable includes an outer sheath, on the outer circumferential wall of the outer sheath are provided wear-resistant strips that are evenly distributed, the wear-resistant strips are arranged along the axial direction of the outer sheath, and the outer wall of the wear-resistant strips away from the outer sheath is provided with evenly distributed mounting holes, the mounting holes are fitted with balls, and the balls form a rotational engagement with the inner wall of the mounting holes. In the above solution, a polyurethane wear-resistant strip is installed on the outer sheath, and freely rotating balls are embedded inside. When the cable rubs against the contact surface, the sliding friction is converted into rolling friction, which greatly reduces the coefficient of friction and the wear rate, and achieves an ultra-long service life.

[0007] The outer sheath is provided with, from the outside to the inside, an outer braided layer, an armored layer, an inner braided layer, a flame-retardant filling layer, a wrapping layer, an elastic thermally conductive bearing strip, an insulating sleeve, a conductive core, and a support tube. The insulating sleeve covers the outside of the conductive core. The cross-section of the elastic thermally conductive strip is a fan-shaped structure, and the elastic thermally conductive strip covers the outside of the insulating sleeve. The elastic thermally conductive strips are arranged in a ring at equal intervals, and multiple elastic thermally conductive strips form a tubular placement groove. A support tube is installed in the tubular placement groove. In the above scheme, the elastic heat-conducting bearing strip of the fan-shaped structure is interlocked with the support tube to form a stable and tight support structure, which reduces the relative displacement and stress of the internal components. The braided layer and the armored layer also have good shielding effect and strong anti-electromagnetic interference capability.

[0008] The inner heat dissipation pipe is filled with a heat-conducting medium, and the multiple elastic heat-conducting support strips are formed by wrapping the wrapping layer. In the above scheme, an elastic thermally conductive bearing strip filled with alumina thermally conductive filler is set up, which can quickly conduct and dissipate the Joule heat generated by the conductive core to the outside, preventing internal heat accumulation. The internal heat dissipation pipe located in the center of the core and its internal thermally conductive medium constitute the core heat dissipation channel, realizing a three-dimensional heat dissipation system from the inside to the outside, effectively reducing the overall operating temperature of the cable.

[0009] The flame-retardant filler layer is wrapped around the outer side of the wrapping layer by an inner braided layer, and the armored layer is wrapped around the outer side of the inner braided layer by an outer braided layer.

[0010] The above solution, through the triple reinforcement structure of the outer braided layer, the armored layer and the inner braided layer, endows the cable with extremely high tensile, compressive, torsional and impact resistance, effectively protecting the internal structure and preventing it from being damaged during dynamic use.

[0011] Preferably, the outer sheath is made of silicone rubber and the wear-resistant strip is made of polyurethane.

[0012] Preferably, the flame-retardant filler layer uses aluminum hydroxide as a high flame-retardant material as filler, and the elastic thermally conductive bearing strip is filled with aluminum oxide thermally conductive filler.

[0013] In the above scheme, aluminum hydroxide, a highly flame-retardant material, is used as the filler for the flame-retardant filling layer. Aluminum hydroxide decomposes and absorbs heat at high temperatures and releases water vapor, which can effectively isolate oxygen and inhibit the spread of flames, greatly improving the fire safety level of the cable.

[0014] Preferably, a portion of the spherical surface of the ball protrudes from the outer surface of the wear-resistant strip, the opening size of the mounting hole is smaller than the diameter of the ball, and the ball is made of wear-resistant ceramic or hardened metal material.

[0015] Preferably, the outer braided layer and the inner braided layer are woven from high-strength synthetic fibers, and the armored layer is made of metal strip or metal wire.

[0016] Preferably, the insulating sleeve is made of cross-linked polyethylene material, and the conductive core is made of multiple tin-plated copper wires twisted together.

[0017] The beneficial effects of this utility model are as follows: 1. The outer sheath is equipped with polyurethane wear-resistant strips, which are embedded with freely rotating balls. When the cable rubs against the contact surface, the sliding friction is converted into rolling friction, which greatly reduces the coefficient of friction and the wear rate, and achieves an ultra-long service life. 2. The fan-shaped elastic heat-conducting bearing strip and the support tube are interlocked to form a stable and tight support structure, which reduces the relative displacement and stress of internal components. The braided layer and the armored layer also have good shielding effect and strong anti-electromagnetic interference capability. 3. An elastic thermally conductive bearing strip filled with alumina thermally conductive filler is set up, which can quickly conduct and dissipate the Joule heat generated by the conductive core to the outside, preventing internal heat accumulation. The internal heat dissipation pipe located in the center of the core and its internal thermally conductive medium constitute the core heat dissipation channel, realizing a three-dimensional heat dissipation system from the inside to the outside, effectively reducing the overall operating temperature of the cable. 4. Through the triple reinforcement structure of the outer braided layer, the armored layer and the inner braided layer, the cable is endowed with extremely high tensile, compressive, torsional and impact resistance, effectively protecting the internal structure and preventing it from being damaged during dynamic use. 5. High flame-retardant aluminum hydroxide material is used as the filler for the flame-retardant filling layer. Aluminum hydroxide decomposes and absorbs heat at high temperatures and releases water vapor, which can effectively isolate oxygen and inhibit the spread of flames, greatly improving the fire safety level of the cable.

[0018] In summary, this utility model transforms sliding friction into rolling friction through the polyurethane wear-resistant strips on the outer sheath and the internal rotatable balls, greatly improving wear resistance; the fan-shaped elastic heat-conducting bearing strip and the central heat dissipation pipe form a three-dimensional heat dissipation system, efficiently dissipating heat; the triple braid and armor layer provide high-strength protection; and the aluminum hydroxide flame-retardant filling layer effectively inhibits the spread of flames, comprehensively achieving ultra-long cable life, high reliability, and excellent safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a wear-resistant power cable proposed in this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of a wear-resistant power cable proposed in this utility model; Figure 3 This is a schematic diagram of the outer braided layer structure of a wear-resistant power cable proposed in this utility model; Figure 4 This is a schematic diagram of the armor layer structure of a wear-resistant power cable proposed in this utility model.

[0020] In the diagram: 1. Outer sheath; 2. Wear-resistant strip; 3. Insertion hole; 4. Ball bearing; 5. Outer braided layer; 6. Armored layer; 7. Inner braided layer; 8. Flame-retardant filler layer; 9. Wrapping layer; 10. Elastic thermally conductive bearing strip; 11. Insulating sleeve; 12. Conductive wire core; 13. Support tube. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, referring to Figure 1-4 A wear-resistant power cable includes an outer sheath 1 made of silicone rubber material. On the outer circumference of the outer sheath 1, six axially arranged polyurethane wear-resistant strips 2 are integrally formed by co-extrusion process. Each wear-resistant strip 2 has equidistantly distributed insertion holes 3, the opening size of which is smaller than the diameter of the ball 4. Wear-resistant ceramic balls 4 are embedded in the insertion holes 3. The spherical surface of the ball 4 protrudes from the outer surface of the wear-resistant strip 2 and can rotate freely.

[0023] The internal structure of the cable, from the outside to the inside, consists of: 5. an outer braided layer made of high-strength polyester yarn; 6. an armored layer formed by longitudinal wrapping of galvanized steel strip; 7. an inner braided layer made of aramid yarn; 8. a flame-retardant filling layer with aluminum hydroxide as filler; and 9. a wrapping layer formed by wrapping polyester tape.

[0024] The inner wrapping layer 9 contains multiple elastic thermally conductive bearing strips 10 with fan-shaped cross sections, which are filled with alumina thermally conductive filler. The multiple elastic thermally conductive bearing strips 10 are arranged in a ring and form tubular placement grooves between each other. A support tube 13 is installed in the groove. The support tube 13 is the inner heat dissipation tube, which is filled with thermally conductive silicone grease as a thermally conductive medium. The center of the elastic thermally conductive bearing strip 10 is covered with an insulating sleeve 11 made of cross-linked polyethylene material. The insulating sleeve 11 contains multiple conductive wire cores 12 made of tin-plated copper wires twisted together.

[0025] Working principle: When the cable moves under the action of external force and rubs against the contact surface, the ball 4 on the wear-resistant strip 2 first contacts the contact surface. The frictional force causes the ball 4 to roll in the mounting hole 3, thereby transforming the traditional sliding friction into rolling friction, fundamentally and significantly reducing frictional resistance and wear, and protecting the outer sheath 1 below. During operation, the conductive core 12 generates heat due to its resistance. The heat is first insulated by the insulating sleeve 11, and then conducted to the alumina filler inside and the outside through the tightly fitted elastic heat-conducting support strip 10. At the same time, the heat-conducting medium in the heat dissipation pipe 13 in the center of the cable also quickly conducts the core heat axially. In this way, the heat is efficiently dissipated through a multi-path three-dimensional heat dissipation system that is "from the inside to the outside" and "from the center to the surroundings", avoiding local overheating. When the cable is subjected to external tension, pressure or torsion, the high-strength composite protective layer composed of the outer braided layer 5, the armored layer 6 and the inner braided layer 7 can effectively absorb and disperse stress and prevent damage to the internal structure. When exposed to high temperature or open flame, the aluminum hydroxide filler in the flame-retardant filling layer 8 will absorb heat through decomposition and generate a barrier layer, effectively delaying the combustion and spread of the flame.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A wear-resistant power cable, comprising an outer sheath (1), characterized in that, The outer wall of the outer sheath (1) is provided with wear-resistant strips (2) that are evenly distributed. The wear-resistant strips (2) are arranged along the axial direction of the outer sheath (1). The outer wall of the wear-resistant strips (2) away from the outer sheath (1) is provided with equally distributed mounting holes (3). The mounting holes (3) are fitted with balls (4). The balls (4) and the inner wall of the mounting holes (3) form a rotational fit. The outer sheath (1) is provided with an outer braided layer (5), an armored layer (6), an inner braided layer (7), a flame-retardant filling layer (8), a wrapping layer (9), an elastic thermally conductive bearing strip (10), an insulating sleeve (11), a conductive core (12), and a support tube (13) from the outside to the inside. The insulating sleeve (11) covers the outside of the conductive core (12). The elastic thermally conductive support strip (10) has a fan-shaped cross-section and is covered by the insulating sleeve (11). The elastic thermally conductive support strip (10) is arranged in a ring at equal intervals, and a tubular placement groove is formed between multiple elastic thermally conductive support strips (10). A support tube (13) is installed in the tubular placement groove. The support tube (13) is filled with a thermally conductive medium. Multiple elastic thermally conductive support strips (10) are wound into shape by wrapping layer (9). The flame-retardant filler layer (8) is wrapped around the outer side of the wrapping layer (9) by the inner braided layer (7), and the armored layer (6) is wrapped around the outer side of the inner braided layer (7) by the outer braided layer (5).

2. The wear-resistant power cable according to claim 1, characterized in that, The outer sheath (1) is made of silicone rubber, and the wear-resistant strip (2) is made of polyurethane.

3. The wear-resistant power cable according to claim 1, characterized in that, The flame-retardant filler layer (8) uses aluminum hydroxide as a high flame-retardant material as filler, and the elastic thermally conductive support strip (10) is filled with aluminum oxide thermally conductive filler.

4. The wear-resistant power cable according to claim 1, characterized in that, Part of the spherical surface of the ball (4) protrudes from the outer surface of the wear-resistant strip (2), the opening size of the mounting hole (3) is smaller than the diameter of the ball (4), and the ball (4) is made of wear-resistant ceramic or hardened metal material.

5. The wear-resistant power cable according to claim 1, characterized in that, The outer braided layer (5) and the inner braided layer (7) are made of high-strength synthetic fibers, and the armored layer (6) is made of metal strip or metal wire.

6. The wear-resistant power cable according to claim 1, characterized in that, The insulating sleeve (11) is made of cross-linked polyethylene material, and the conductive core (12) is made of multiple tin-plated copper wires twisted together.

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