An antistatic rubber-sheathed cable assembly

Abstract

This utility model relates to the field of cable technology, and in particular to an antistatic rubber-sheathed cable assembly, comprising, from the inside out, a conductor core, an inner insulation layer, an inner static discharge layer, a buffer protection layer, an outer static discharge layer, a semi-conductive buffer film, and a rubber outer sheath. The inner insulation layer tightly covers the outside of the conductor core, the inner static discharge layer is attached to the outside of the inner insulation layer, the buffer protection layer covers the outside of the inner static discharge layer, the outer static discharge layer is sleeved on the outside of the buffer protection layer, the semi-conductive buffer film covers between the outer static discharge layer and the rubber outer sheath, and the rubber outer sheath covers the outside of the semi-conductive buffer film. This utility model has good adaptability to various scenarios and is technically practical. The overall structure retains the flexibility of the multi-strand soft copper wire conductor core, making it suitable for frequent bending conditions such as those encountered in coal mining machines and mobile equipment. Each layer's structural design utilizes mature cable industry processes and materials, enabling industrial production without the need for special production equipment.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to an antistatic rubber-sheathed cable assembly. Background Technology

[0002] In special environments such as flammable and explosive environments and static-sensitive environments, the antistatic properties and mechanical protection capabilities of cables are directly related to production safety and stable equipment operation.

[0003] Traditional antistatic rubber-sheathed cables typically achieve basic electrostatic protection by adding antistatic masterbatch to the rubber outer sheath. Their core structure usually includes a conductor, a single insulation layer, a simple shielding layer, and a rubber sheath. Mechanical protection mainly relies on the thickness and material strength of the sheath itself.

[0004] For example, patent application number CN202311513426.2 discloses an anti-interference, anti-static, and reinforced metal shielded rubber-sheathed flexible cable for coal mining machines. This cable achieves anti-static function by adding anti-static masterbatch to the rubber outer sheath, uses triangular prism metal chain cylinder and discrete spring buffer assembly to improve mechanical strength, and sets a metal shielding layer to enhance anti-interference capability.

[0005] However, the above-mentioned literature has the following drawbacks: The antistatic function of the aforementioned cables relies entirely on the antistatic masterbatch in the rubber outer sheath. When the outer sheath is damaged due to aging, wear, or impact, there is a significant risk of failure in the antistatic performance. Furthermore, the inner and outer shielding layers only focus on electric field balance and do not form a complete electrostatic discharge link connected to the grounding system. Internal static electricity is prone to accumulate, leading to the risk of partial discharge.

[0006] In addition, although the triangular prism metal chain cylinder inside the cable can improve the compressive strength, the metal chain plate is too rigid and cannot adapt to the frequent bending conditions of the cable. It is prone to bending jamming or fatigue fracture of the flexible strip. Furthermore, the rigid structure of the spring and the arc-shaped metal plate is prone to plastic deformation due to repeated impacts, resulting in high maintenance costs.

[0007] Therefore, it is necessary to design a new type of rubber-sheathed cable assembly with electrostatic discharge capability. Utility Model Content

[0008] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: an antistatic rubber-sheathed cable assembly, comprising, from the inside out, a conductor core, an inner insulation layer, an inner static discharge layer, a buffer protection layer, an outer static discharge layer, a semi-conductive buffer film, and a rubber outer sheath; The inner insulation layer tightly covers the outside of the conductor core, the inner static discharge layer is attached to the outside of the inner insulation layer, the buffer protection layer covers the outside of the inner static discharge layer, the outer static discharge layer is sleeved on the outside of the buffer protection layer, the semi-conductive buffer film is covered between the outer static discharge layer and the rubber outer sheath, and the rubber outer sheath covers the outside of the semi-conductive buffer film. A semi-conductive adhesive coating is provided between the inner insulating layer and the inner static discharge layer. The semi-conductive adhesive coating is formed by brushing with epoxy conductive adhesive and completely filling the gap between the two layers to form an inner layer static conduction interface. The outer electrostatic discharge layer is provided with metal rings spaced axially on its outer side. The metal rings are sleeved on the outer electrostatic discharge layer and spot welded to it. The sidewalls of the metal rings abut against the semi-conductive buffer film to form a middle layer electrostatic charging structure. The outer side of the semi-conductive buffer film is provided with a raised edge, and the inner sidewall of the rubber outer sheath is provided with an axially extending strip groove. The raised edge is embedded in the strip groove to form an axial limiting structure, and the semi-conductive buffer film conducts the static electricity on the surface of the rubber outer sheath to the outer static discharge layer. The inner and outer static discharge layers form a dual discharge path, and the outer static discharge layer releases static electricity by connecting to the grounding part of the matching cable connector.

[0009] Based on any of the above technical solutions, a further optimization is made as follows: the conductor core is a bundle structure formed by twisting multiple strands of soft copper wire, and a spiral texture is formed on the outside of the twisted conductor core. The inner insulation layer is extruded on the outside of the spiral texture and tightly engaged with the spiral texture.

[0010] Based on any of the above technical solutions, a further optimization is made as follows: the inner electrostatic discharge layer is a continuous semiconductor film, the semiconductor film is spirally wound around the outer side of the inner insulating layer along the spiral surface of the inner insulating layer, and the overlap width of the semiconductor film winding at adjacent parts is 1 / 5 to 1 / 3 of the width of the semiconductor film.

[0011] Based on any of the above technical solutions, a further optimization is made as follows: the buffer protective layer is a hollow elastic sleeve, and a number of annular buffer cavities are provided inside the elastic sleeve at intervals along the axial direction, and adjacent annular buffer cavities are interconnected by axial connecting grooves.

[0012] Based on any of the above technical solutions, a further optimization is made as follows: a number of reinforcing ribs are distributed at intervals along the circumference on the inner sidewall of each of the annular buffer cavities, and both ends of each reinforcing rib are formed and fixed at both ends of the annular buffer cavity.

[0013] Based on any of the above technical solutions, the following further optimization is made: the external static discharge layer includes a woven mesh made of tin-plated copper wires, each mesh opening of the woven mesh is diamond-shaped, the nodes formed by the interlacing of the tin-plated copper wires of the woven mesh are fixed by spot welding, and the inner sidewall of the woven mesh is tightly attached to the outer sidewall of the buffer protective layer.

[0014] Based on any of the above technical solutions, a further optimization is made: the semi-conductive buffer film is tightly bonded between the outer static discharge layer and the outer sheath.

[0015] Based on any of the above technical solutions, a further optimization is made as follows: each of the metal rings is sleeved on the outside of the woven mesh and spot-welded to the woven mesh respectively, and the sidewalls of each of the metal rings abut against the surface of the semi-conductive buffer film.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This invention achieves efficient conduction of static electricity in the inner layer without blind spots. Through the design of continuous semiconductor film wound along the spiral curved surface of the inner insulating layer, combined with an overlap width of 1 / 5-1 / 3, it precisely adapts to the curved surface formed by the stranding of the conductor core, eliminating the static electricity collection blind spots caused by splicing breaks and winding gaps; the tight adhesion of the semiconductive adhesive coating to the film further ensures the directional transmission of static electricity from the surface of the insulating layer to the discharge layer, avoiding safety hazards caused by local charge accumulation. 2. This utility model takes into account both buffer protection performance and structural stability. The buffer protection layer adopts a hollow elastic sleeve with annular buffer cavity with intervals. Through the compression of the cavity and the deformation adaptation of the connecting groove, it can efficiently absorb external impact and adapt to bending conditions. The circumferential reinforcing rib design in the annular buffer cavity enhances the tensile and tear resistance of the sleeve without affecting the buffer function, and extends the service life of the cable in frequent movement and complex stress scenarios. 3. The diamond-shaped woven mesh of the outer static discharge layer combines flexibility and conductivity, and the spot welding of the nodes prevents the breakage of the conductive path caused by deformation; the semi-conductive buffer film fills the gap between the woven mesh and the outer sheath, which not only realizes the efficient conduction of static electricity on the surface of the sheath, but also alleviates interlayer friction and wear; the current-collecting effect of the metal ring further improves the static electricity conduction efficiency.

[0017] 4. This utility model has good adaptability to various scenarios and practicality of technology. The overall structure retains the flexibility of the multi-strand soft copper wire conductor core, which is suitable for frequent bending conditions such as coal mining machines and mobile equipment. The design of each layer adopts mature processes and materials in the cable industry, such as tin-plated copper wire and epoxy conductive adhesive, which can achieve industrial production without special production equipment. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the rubber outer sheath of this utility model.

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the semi-conductive buffer film of this utility model.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the buffer protective layer of this utility model.

[0023] In the diagram, 1. Soft copper wire; 2. Inner insulation layer; 3. Semi-conductive adhesive coating; 4. Inner static discharge layer; 5. Buffer protection layer; 501. Annular buffer cavity; 502. Reinforcing rib; 503. Axial connecting groove; 6. Outer static discharge layer; 7. Metal ring; 8. Semi-conductive buffer film; 9. Rubber outer sheath; 10. Raised edge; 11. Strip groove. Detailed Implementation

[0024] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-4 As shown in the image.

[0025] Example 1: An antistatic rubber-sheathed cable assembly includes, from the inside out, a conductor core, an inner insulation layer 2, an inner static discharge layer 4, a buffer protection layer 5, an outer static discharge layer 6, a semi-conductive buffer film 8, and a rubber outer sheath 9; the inner insulation layer 2 tightly covers the outside of the conductor core, the inner static discharge layer 4 is attached to the outside of the inner insulation layer 2, the buffer protection layer 5 covers the outside of the inner static discharge layer 4, the outer static discharge layer 6 is sleeved on the outside of the buffer protection layer 5, the semi-conductive buffer film 8 covers the space between the outer static discharge layer 6 and the rubber outer sheath 9, and the rubber outer sheath 9 covers the outside of the semi-conductive buffer film 8.

[0026] It should be noted that the above-mentioned layered structure forms a complete system from current transmission to external protection: the conductor core serves as the core of current transmission, the inner insulation layer 2 isolates current leakage to ensure insulation safety, the inner static discharge layer 4 and the outer static discharge layer 6 respectively conduct static electricity in the internal and surface layers, the buffer protection layer 5 absorbs external impacts to prevent damage to the inner structure, the semi-conductive buffer film 8 realizes static electricity conduction between the outer discharge layer and the sheath, and the rubber outer sheath 9 resists external wear and corrosion. Through the tight wrapping and fitting assembly relationship of each layer, the stability of the basic function and protective performance of the cable is ensured.

[0027] A semi-conductive adhesive coating 3 is provided between the inner insulating layer 2 and the inner static discharge layer 4. The semi-conductive adhesive coating 3 is formed by brushing with epoxy conductive adhesive and completely filling the gap between the two layers to form an inner layer static conduction interface.

[0028] It should be noted that when the inner insulating layer 2 and the inner static discharge layer 4 are bonded together, micro-gaps may easily occur due to surface unevenness. These gaps may become points of static accumulation. The semi-conductive adhesive coating 3, formed by applying epoxy conductive adhesive, can achieve a tight connection between the two layers through adhesive properties, and can also eliminate static electricity in the gaps through its own semi-conductive properties. This allows the static electricity generated around the conductor core and on the surface of the inner insulating layer 2 to be quickly conducted to the inner static discharge layer 4, forming a seamless inner layer static electricity conduction path.

[0029] Several metal rings 7 are spaced apart along the axial direction on the outer side of the outer static discharge layer 6. The metal rings 7 are sleeved on the outer static discharge layer 6 and spot welded to it. The sidewalls of the metal rings 7 abut against the semi-conductive buffer film 8 to form a middle layer static current collection structure.

[0030] It should be noted that the outer static discharge layer 6 has a wide coverage area, and static electricity is easily dispersed in different areas, resulting in uneven conduction efficiency. By setting metal rings 7 at intervals on its outer side, and fixing the metal rings 7 to the outer static discharge layer 6 by spot welding, the static electricity dispersed in different positions of the braided mesh can be gathered onto the metal rings 7; at the same time, the sidewall of the metal ring 7 abuts against the semi-conductive buffer membrane 8, which can synchronously converge the static electricity on the sheath surface conducted by the semi-conductive buffer membrane 8, so that the originally dispersed static electricity forms a concentrated conduction bundle, improving the efficiency of subsequent grounding release.

[0031] The semi-conductive buffer film 8 has a raised edge 10 on its outer side, and the inner wall of the rubber outer sheath 9 has an axially extending strip groove 11. The raised edge 10 is embedded in the strip groove 11 to form an axial limiting structure, and the semi-conductive buffer film 8 conducts static electricity from the surface of the rubber outer sheath 9 to the outer static discharge layer 6.

[0032] It should be noted that during cable dragging and bending, the rubber outer sheath 9 and the internal structure are prone to relative sliding, which may disrupt the contact relationship for electrostatic conduction. The raised edge 10 on the outer side of the semi-conductive buffer film 8 is embedded in the strip groove 11 on the inner side of the rubber outer sheath 9, forming an axial limiting structure, which effectively restricts the relative sliding between the two; at the same time, the semi-conductive buffer film 8 itself has conductive properties, which can quickly adsorb and conduct the static electricity generated on the surface of the rubber outer sheath 9 due to friction and induction to the outer static discharge layer 6, realizing the timely conduction of surface static electricity.

[0033] The inner static discharge layer 4 and the outer static discharge layer 6 form a dual discharge path. The outer static discharge layer 6 achieves static discharge by connecting to the grounding part of the matching cable connector.

[0034] It should be noted that when the conductor core is energized, the electric field generated by the current will polarize the free charges on the surface of the conductor core. At the same time, a small amount of charge will be generated at the tight contact interface between the conductor core and the inner insulation layer 2 due to contact electrification. These charges will not penetrate the inner insulation layer 2, but will accumulate on the inner surface of the inner insulation layer 2 near the conductor core.

[0035] The semi-conductive adhesive coating 3 can capture static electricity on the surface of the inner insulation layer 2 and transfer it to the inner static discharge layer 4. That is, static electricity can be transferred through electric field induction without direct contact between conductors. The static electricity in the conductor core will form an electric field around it, which will polarize the charge on the surface of the inner insulation layer 2. The presence of the semi-conductive coating provides a directional migration path for the polarized charge, which is eventually transferred to the inner static discharge layer 4. In the end, the static electricity generated by the conductor core inside the cable during operation is conducted through the inner static discharge layer 4.

[0036] Static electricity on the surface of the outer sheath is conducted to the outer static electricity discharge layer 6 via the semi-conductive buffer film 8. The two form an independent yet interconnected inner and outer dual discharge path, which fully covers the area where the cable may generate static electricity. The outer static electricity discharge layer 6 extends to the cable joint and, after being connected to the grounding part of the joint, can discharge the collected inner and outer static electricity to the ground in a unified manner, avoiding the accumulation of static electricity inside or on the surface of the cable and causing safety risks.

[0037] Based on any of the above technical solutions, a further optimization is made as follows: the conductor core is a bundle structure formed by twisting multiple strands of soft copper wire 1, and a spiral texture is formed on the outside of the twisted conductor core. The inner insulation layer 2 is extruded on the outside of the spiral texture and tightly engaged with the spiral texture.

[0038] It should be noted that when the multi-strand soft copper wire 1 is stranded to form a bundle structure, each copper wire is spirally twisted along the central axis, creating continuous spiral textured depressions and protrusions between adjacent copper wires. When the inner insulation layer 2 is coated by an extrusion process, the molten insulation base material fully fills the textured depressions. After cooling and solidification, the surface of the inner insulation layer 2 forms a spiral shape that complements the texture of the conductor core. The two are mechanically engaged through the physical structure of the protrusions embedding into the depressions. This engagement can resist the axial and radial shear forces generated when the cable is bent or dragged, preventing relative sliding between the conductor core and the inner insulation layer 2, and ensuring the positional stability of the inner layer structure.

[0039] When the conductor core is energized, the electric field generated by the current polarizes the surface charge of the conductor core. At the same time, a small amount of charge is generated at the tight contact interface between the conductor core and the inner insulation layer 2 due to the contact potential difference. Since the two are tightly bonded throughout the entire area through the spiral texture without any obvious gaps, the polarization charge and the contact charge can directly act on the inner surface of the inner insulation layer 2, causing the surface of the inner insulation layer 2 to accumulate charge rapidly.

[0040] Based on any of the above technical solutions, a further optimization is made as follows: the inner electrostatic discharge layer 4 is a continuous semiconductor film, and the semiconductor film is spirally wound around the outer side of the inner insulating layer 2 along the spiral surface of the inner insulating layer 2, with the overlap width of the semiconductor film winding at adjacent parts being 1 / 5 to 1 / 3 of the width of the semiconductor film.

[0041] It should be noted that the continuous membrane avoids conduction breakpoints in the spliced ​​discharge layer. The spiral winding can precisely adapt to the curved shape of the inner insulation layer 2 formed by the stranding of the conductor core, ensuring that the membrane and the semi-conductive adhesive coating 3 on the outside of the inner insulation layer 2 are tightly bonded, providing a contact basis for electrostatic conduction. The 1 / 5-1 / 3 overlap width can cover the tiny gaps that may appear during the winding process, eliminating the blind zone of electrostatic collection, so that the static electricity conducted from the surface of the inner insulation layer 2 can be quickly diffused laterally through the membrane, realizing the comprehensive capture and initial convergence of static electricity in the inner layer, and avoiding local charge accumulation.

[0042] Based on any of the above technical solutions, a further optimization is made as follows: the buffer protective layer 5 is a hollow elastic sleeve, and a plurality of annular buffer cavities 501 are provided inside the elastic sleeve at intervals along the axial direction, and adjacent annular buffer cavities 501 are interconnected by an axial connecting groove 503.

[0043] The hollow elastic sleeve itself has basic deformation capacity, which can initially absorb the stress generated by external compression and impact; the internally spaced annular buffer cavity 501 further disperses the impact force through cavity compression, reducing the risk of damage to the inner static discharge layer 4, insulation layer and other structures; the axial connecting groove 503 between adjacent cavities can realize the flow of air or filling medium in the cavity when the cable is bent, so that the buffer cavity can flexibly adjust its volume with bending deformation, avoiding sleeve breakage caused by rigid tension or compression. At the same time, the hollow structure reduces the overall weight of the cable while ensuring buffering performance, making it suitable for mobile use scenarios.

[0044] Example 2: Compared with Example 1, this example also includes the following technical features: Based on any of the above technical solutions, a further optimization is made as follows: a plurality of reinforcing ribs 502 are distributed at intervals along the circumference on the inner sidewall of each of the annular buffer cavities 501, and both ends of each reinforcing rib 502 are formed and fixed at both ends of the annular buffer cavity 501.

[0045] Although the elastic sleeve has a cushioning effect, it is prone to deformation failure under long-term tension or frequent bending. The reinforcing rib 502 can enhance the structural strength of the buffer cavity through its own rigidity and resist the action of radial and axial external forces. The design of the circumferentially spaced distribution can evenly distribute the stress to the entire buffer cavity, avoiding the cavity wall damage caused by excessive local stress. The way the two ends are formed and fixed to the end of the buffer cavity makes the reinforcing rib 502 and the cavity form an integral force-bearing structure, which does not affect the compression deformation function of the buffer cavity and can extend the service life of the buffer protective layer 5.

[0046] Based on any of the above technical solutions, the following further optimization is made: the external static discharge layer 6 includes a woven mesh made of tin-plated copper wires, each mesh opening of the woven mesh is diamond-shaped, the nodes formed by the interlacing of the tin-plated copper wires of the woven mesh are fixed by spot welding, and the inner sidewall of the woven mesh is tightly attached to the outer sidewall of the buffer protective layer 5.

[0047] Tin-plated copper wire combines good conductivity and corrosion resistance, enabling efficient collection of static electricity and resistance to environmental erosion; the diamond-shaped mesh structure ensures high coverage of the braided mesh while maintaining flexibility, adapting to cable bending conditions; spot welding at the nodes prevents the braided mesh from loosening and shifting during dragging and deformation, ensuring the integrity of the conductive path; the design of being tightly fitted with the buffer protection layer 5 allows static electricity conducted from the inner static discharge layer 4 to the outside of the buffer layer, as well as static electricity generated by the external environment, to be quickly transferred to the braided mesh, forming an outer static discharge path.

[0048] Based on any of the above technical solutions, a further optimization is made: the semi-conductive buffer film 8 is tightly bonded between the outer static discharge layer 6 and the outer sheath.

[0049] The surface of the woven mesh of the outer static discharge layer 6 has an uneven texture, which can easily create gaps when in direct contact with the rubber outer sheath 9. The semi-conductive buffer membrane 8 can fill these gaps, allowing the static electricity generated by friction on the surface of the outer sheath to be conducted to the woven mesh through the membrane. At the same time, the elastic properties of the membrane can absorb the relative friction and deformation stress between the woven mesh and the sheath, preventing the woven mesh from being worn by the sheath and causing a decrease in conductivity, thus achieving the dual functions of static conduction and mechanical buffering.

[0050] Based on any of the above technical solutions, a further optimization is made as follows: each of the metal rings 7 is sleeved on the outside of the woven mesh and spot-welded to the woven mesh respectively, and the sidewalls of each of the metal rings 7 abut against the surface of the semi-conductive buffer film 8.

[0051] Static electricity dispersed in different areas of the woven mesh is prone to uneven conduction. The metal ring 7 forms an electrical connection with the woven mesh through spot welding, which can collect the dispersed static electricity into the ring body and improve the conduction efficiency. The side wall of the metal ring 7 abuts against the semi-conductive buffer membrane 8, which can directly introduce the static electricity of the outer sheath conducted by the membrane into the woven mesh, realizing the concentrated convergence of internal and external static electricity. At the same time, the metal ring 7 can also enhance the local structural strength of the woven mesh and avoid mesh damage caused by excessive stretching.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0053] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. An antistatic rubber-sheathed cable assembly, characterized in that: It includes, from the inside out, a conductor core, an inner insulation layer, an inner static discharge layer, a buffer protection layer, an outer static discharge layer, a semi-conductive buffer film, and a rubber outer sheath; The inner insulation layer tightly covers the outside of the conductor core, the inner static discharge layer is attached to the outside of the inner insulation layer, the buffer protection layer covers the outside of the inner static discharge layer, the outer static discharge layer is sleeved on the outside of the buffer protection layer, the semi-conductive buffer film is covered between the outer static discharge layer and the rubber outer sheath, and the rubber outer sheath covers the outside of the semi-conductive buffer film. A semi-conductive adhesive coating is provided between the inner insulating layer and the inner static discharge layer. The semi-conductive adhesive coating is formed by brushing with epoxy conductive adhesive and completely filling the gap between the two layers to form an inner layer static conduction interface. The outer electrostatic discharge layer is provided with metal rings spaced axially on its outer side. The metal rings are sleeved on the outer electrostatic discharge layer and spot welded to it. The sidewalls of the metal rings abut against the semi-conductive buffer film to form a middle layer electrostatic charging structure. The outer side of the semi-conductive buffer film is provided with a raised edge, and the inner sidewall of the rubber outer sheath is provided with an axially extending strip groove. The raised edge is embedded in the strip groove to form an axial limiting structure, and the semi-conductive buffer film conducts the static electricity on the surface of the rubber outer sheath to the outer static discharge layer. The inner and outer static discharge layers form a dual discharge path, and the outer static discharge layer releases static electricity by connecting to the grounding part of the matching cable connector.

2. An antistatic, rubber jacketed cable assembly according to claim 1, characterized in that: The conductor core is a bundle structure made of multiple strands of soft copper wires twisted together. The outer side of the twisted conductor core forms a spiral texture. The inner insulating layer is extruded on the outside of the spiral texture and is tightly engaged with the spiral texture.

3. An antistatic, rubber jacketed cable assembly according to claim 2, characterized in that: The inner electrostatic discharge layer is a continuous semiconductor film. The semiconductor film is spirally wound around the outer side of the inner insulating layer along the spiral surface of the inner insulating layer. The overlap width of the semiconductor film winding at adjacent parts is 1 / 5 to 1 / 3 of the width of the semiconductor film.

4. An antistatic, rubber jacketed cable assembly according to claim 3, characterized in that: The buffer protective layer is a hollow elastic sleeve. Inside the elastic sleeve, there are several annular buffer cavities spaced apart along the axial direction. Adjacent annular buffer cavities are interconnected by axial connecting grooves.

5. An antistatic, rubber jacketed cable assembly according to claim 4, characterized in that: Several reinforcing ribs are distributed at intervals along the circumference on the inner sidewall of each of the annular buffer cavities, and both ends of each reinforcing rib are formed and fixed at both ends of the annular buffer cavity.

6. An antistatic, rubber jacketed cable assembly according to claim 5, characterized in that: The external static discharge layer includes a woven mesh made of tin-plated copper wires. Each mesh opening of the woven mesh is diamond-shaped. The nodes formed by the interlacing of the tin-plated copper wires of the woven mesh are fixed by spot welding, and the inner wall of the woven mesh is tightly attached to the outer wall of the buffer protective layer.

7. An antistatic, rubber jacketed cable assembly according to claim 6, characterized in that: The semi-conductive buffer film is tightly bonded between the outer static discharge layer and the outer sheath.

8. An antistatic, rubber jacketed cable assembly according to claim 7, characterized in that: Each of the metal rings is sleeved on the outside of the woven mesh and spot-welded to the woven mesh, and the sidewalls of each of the metal rings abut against the surface of the semi-conductive buffer film.

Images