A highly flexible, bend-resistant, synchronous double-twisted shielded flame-retardant drag chain cable

Abstract

The present invention discloses a highly flexible, bend-resistant, synchronous double-twisted shielded flame-retardant drag chain cable, which relates to the technical field of cables. It includes a plurality of link sections, and the plurality of link sections form a drag chain. A cable structure is arranged inside the link sections, and a cable-blocking structure is arranged on the link sections. The cable structure includes an outer sheath layer. A braided layer is arranged inside the outer sheath layer. A wrapping layer is arranged inside the braided layer. A core wire is arranged inside the wrapping layer. A conductor is arranged inside the core wire. A filler is arranged inside the wrapping layer. The cable structure uses class-five or class-six oxygen-free copper soft conductor wires to complete pair-twisting and overall twisting synchronously, making the cable diameter small after stranding, enhancing the bend resistance of the cable structure, and avoiding the occurrence of open circuit and short circuit phenomena easily during high-frequency bending of the cable structure. At the same time, through the combined use of the cable-blocking structure and the disassembly and assembly structure, when a single cable structure is damaged, it can be disassembled and replaced separately.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a highly flexible, bend-resistant, synchronous, double-twisted, shielded, and flame-retardant drag chain cable. Background Art

[0002] Drag chain cables, usually also called drag cables or tank chain cables, are cables that can move back and forth with a drag chain without being easily worn. The structural design of drag chain cables endows them with extremely high flexibility, wear resistance, and bending resistance. Therefore, they are widely used in various occasions where the cable needs to move back and forth with the equipment unit, such as industrial electronic systems, warehousing equipment, robots, fire protection systems, cranes, and the metallurgical industry.

[0003] In occasions where the equipment unit needs to move back and forth, in order to prevent the cable from being entangled, worn, or pulled off, the cable is often placed in a cable drag chain. However, traditional double-twisted shielded drag chain cables use six-category conductors for irregular stranding, and each group is separately twisted and then stranded together. This structure results in a relatively large outer diameter of the cable, a too large and irregular stranding span between each pair of core wires, and is prone to open circuit and short circuit phenomena during high-frequency bending; and when the cable is in the drag chain, in order to prevent the cable from crossing and winding, a chain buckle is integrated in the link to achieve the effect of separating the cables. However, the integrated chain buckle brings difficulties such as inconvenient cable threading and difficult replacement of a single damaged cable. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art and propose a highly flexible, bend-resistant, synchronous, double-twisted, shielded, and flame-retardant drag chain cable to solve the problems in the above technical solutions that the traditional double-twisted shielded drag chain cable has a large outer diameter and an irregular stranding span due to the irregular stranding of six-category conductors, and is prone to open circuit and short circuit during high-frequency bending; at the same time, the chain buckle integrated in the link makes it inconvenient to thread the cable and difficult to replace a single damaged cable.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A highly flexible, bend-resistant, synchronous, double-twisted, shielded, and flame-retardant drag chain cable includes a plurality of links, and the plurality of links form a drag chain. A cable structure is provided inside the link.

[0006] A cable blocking structure is provided on the link.

[0007] A disassembly and assembly structure is provided on the link.

[0008] The cable structure includes an outer sheath layer. A braided layer is provided inside the outer sheath layer. A wrapping layer is provided inside the braided layer. Core wires are provided inside the wrapping layer. Conductors are provided inside the core wires. Fillers are provided inside the wrapping layer.

[0009] The cable retaining structure includes a baffle plate. Positioning blocks are fixedly installed on both sides of the baffle plate. A first guiding groove is provided on one side of the positioning block. A clamping groove is formed at the top of the positioning block. A second guiding groove is formed at the top of the positioning block. A third guiding groove is formed on the link.

[0010] As a preferred embodiment, the outer sheath is an insulating layer made of polyvinyl chloride material, having the characteristics of wear resistance, oil resistance, cold resistance and corrosion resistance. The braided layer is woven from class 5 tinned copper or bare copper outer conductors. The wrapping layer is made of non-woven fabric. The core wire uses polyvinyl chloride material and has the properties of wear resistance, oil resistance, corrosion resistance, high temperature resistance of ℃ and cold resistance of -℃. The conductor is concentrically stranded by class 5 or class 6 oxygen-free copper soft conductor wires, and bulletproof wires are added around the oxygen-free copper soft conductor wires. The filler is a nylon rope.

[0011] The beneficial effects of adopting the above further scheme are as follows: The polyvinyl chloride material of the outer sheath provides the characteristics of wear resistance, oil resistance, cold resistance and corrosion resistance; The braided layer uses class 5 tinned copper or bare copper outer conductors, enhancing the shielding effect; The non-woven fabric design of the wrapping layer contributes to the flexibility and durability of the cable; The special material of the core wire endows it with the properties of wear resistance, oil resistance, corrosion resistance, high temperature resistance and cold resistance; The conductor uses oxygen-free copper soft conductor wires, ensuring the stability and high efficiency of signal transmission; The filler is a nylon rope, enhancing the structural strength of the cable.

[0012] As a preferred embodiment, the first guiding groove is designed as an inclined surface. The number of the clamping grooves is three and they are evenly distributed on the positioning block. The second guiding groove connects the first guiding groove with the three clamping grooves. The size of the third guiding groove is adapted to the moving track of the positioning block.

[0013] The beneficial effects of adopting the above further scheme are as follows: These designs enable the cable retaining structure to be conveniently installed and fixed on the link, and at the same time facilitate the insertion and fixation of the cable. The inclined surface-designed first guiding groove and the evenly distributed clamping grooves contribute to quick and accurate positioning, while the second guiding groove and the third guiding groove ensure the stability and firmness of the cable retaining structure.

[0014] As a preferred embodiment, a disassembly and assembly structure is provided on the link. The disassembly and assembly structure includes an installation cavity. A moving block is movably installed in the installation cavity. A clamping block is fixedly installed at the bottom of the moving block. Limiting blocks are fixedly installed on both sides of the moving block. A limiting groove is formed inside the link. A return spring is fixedly installed at the top of the moving block. A pulling block is fixedly installed at the top of the moving block.

[0015] The beneficial effects of adopting the above further scheme are as follows: Through the design of components such as the installation cavity, moving block, clamping block, and limiting block, the rapid fixing and disassembly of the chain links are realized, improving the flexibility and maintainability of the drag chain cable.

[0016] As a preferred embodiment, the installation cavity is opened inside the chain link, the size of the limiting groove is adapted to the moving track of the limiting block, and the installation cavity is communicated with the limiting groove.

[0017] The beneficial effects of adopting the above further scheme are as follows: The opening position and size of the installation cavity are adapted to the moving track of the moving block, while the size of the limiting groove matches the moving track of the limiting block. These designs ensure the smooth operation and accurate fixing of the disassembly and assembly structure.

[0018] As a preferred embodiment, the clamping block is designed in a wedge shape, the size of the clamping groove is adapted to the clamping block, and the wedge-shaped inclined surface of the clamping block is adapted to the inclined surface of the first guiding groove.

[0019] The beneficial effects of adopting the above further scheme are as follows: These designs enable the clamping block to be conveniently inserted into the clamping groove and fixed on the chain link. The design of the wedge-shaped inclined surface helps the guiding and fixing of the clamping block during the insertion process, ensuring the firmness and stability of the disassembly and assembly structure.

[0020] As a preferred embodiment, the top of the return spring is fixedly connected to the inner top wall of the installation cavity. The pulling block is composed of a connecting rod and a pull rod. The connecting rod is fixedly installed at the top of the moving block and is located at the center of the return spring. The pull rod extends to the top of the chain link and its surface is in contact.

[0021] The beneficial effects of adopting the above further scheme are as follows: The setting of the return spring enables the moving block to automatically reset when not under external force, and the design of the pulling block facilitates the operation and control of the moving block by the operator.

[0022] As a preferred embodiment, a support rod is fixedly installed inside the chain link. A supporting structure is provided inside the chain link. The supporting structure includes a base fixedly installed on the inner bottom wall of the chain link and a base fixedly installed at the bottom of the baffle. Anti-slip pads are fixedly installed on the opposite sides of the upper and lower bases. The anti-slip pads are in close contact with the outer sheath layer in the cable structure.

[0023] The beneficial effects of adopting the above further scheme are as follows: The setting of the support rod helps to maintain the shape and stability of the chain link, while the bases and anti-slip pads in the supporting structure can closely fit the outer sheath layer of the cable structure, preventing the cable from shaking and wearing in the drag chain, and improving the service life and safety of the cable.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0025] 1. In the present invention, the cable structure adopts a process in which five - type or six - type oxygen - free copper soft conductor wires are twisted in pairs and stranded together synchronously, making the outer diameter of the completed cable regular, round and small, enhancing the bending resistance of the cable structure, and avoiding the problems that the outer diameter of the cable structure after stranding is large, the twisting span between each pair of core wires is too large and irregular, and open - circuit and short - circuit phenomena are likely to occur during high - frequency bending.

[0026] 2. In the present invention, the cable structure is placed on the bottom base and fitted with an anti - slip pad. Then, the cable - blocking structure is installed on the link. At this time, the anti - slip pad on the top base also fits with the cable structure, which can separate the cable structure within the link and prevent the cable structure from getting cross - wound.

[0027] 3. In the present invention, the cable - blocking structure is fixed to the link through a disassembly and assembly structure to achieve the purpose of separating the cable structure and facilitating wire threading. When any one of the cable structures is damaged, the fixing effect of the cable - blocking structure can be released through the disassembly and assembly structure, and the single - cable structure can be conveniently removed for easy replacement. Description of the Drawings

[0028] Figure 1 is a schematic diagram of the overall structure of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0029] Figure 2 is a schematic diagram of the cable structure and related part structures of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0030] Figure 3 is a schematic diagram of the structure at the link of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0031] Figure 4 is a schematic diagram of the cable - blocking structure of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0032] Figure 5 is a schematic diagram of the disassembly and assembly structure and related part structures of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0033] Figure 6 is a schematic cross - sectional view of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable;

[0034] Figure 7 is a schematic cross - sectional view of the cable structure of a highly flexible, bend - resistant, synchronously double - twisted, shielded and flame - retardant drag - chain cable.

[0035] Description of the Reference Numerals:

[0036] 1. Link;

[0037] 2. Cable structure; 201, outer sheath; 202, braided layer; 203, wrapping layer; 204, core wire; 205, conductor; 206, filler;

[0038] 3. Cable blocking structure; 301, baffle; 302, positioning block; 303, first guiding groove; 304, clamping groove; 305, second guiding groove; 306, third guiding groove;

[0039] 4. Disassembly and assembly structure; 401, installation cavity; 402, moving block; 403, clamping block; 404, limiting block; 405, limiting groove; 406, return spring; 407, pulling block;

[0040] 5. Support rod;

[0041] 6. Support structure; 601, base; 602, anti-slip pad. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment: As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the present invention provides a technical solution: a highly flexible, bend-resistant, synchronous, double-twisted, shielded, flame-retardant drag chain cable, including a plurality of chain links 1. A plurality of chain links 1 form a drag chain, and a cable structure 2 is arranged inside the chain link 1;

[0044] A cable blocking structure 3 is arranged on the chain link 1;

[0045] A disassembly and assembly structure 4 is arranged on the chain link 1;

[0046] The cable structure 2 includes an outer sheath 201. A braided layer 202 is arranged inside the outer sheath 201. A wrapping layer 203 is arranged inside the braided layer 202. A core wire 204 is arranged inside the wrapping layer 203. A conductor 205 is arranged inside the core wire 204. A filler 206 is arranged inside the wrapping layer 203;

[0047] The cable retaining structure 3 includes a baffle 301. Positioning blocks 302 are fixedly installed on both sides of the baffle 301. A first guiding groove 303 is provided on one side of the positioning block 302. A clamping groove 304 is formed at the top of the positioning block 302. A second guiding groove 305 is formed at the top of the positioning block 302. A third guiding groove 306 is formed on the link 1.

[0048] The cable structure 2 adopts the process of simultaneous stranding and overall stranding of five - class or six - class oxygen - free copper soft conductor wires, making the overall diameter of the cable small, and avoiding open - circuit and short - circuit situations during high - frequency bending. After inserting the positioning blocks 302 on both sides of the baffle 301 into the link 1 along the third guiding groove 306 and fixing the position of the baffle 301, the position of each cable structure 2 can be fixed by each baffle 301, preventing the cable structure 2 from being cross - wound within the link 1.

[0049] As Figure 1 、 Figure 2 、 Figure 6 and Figure 7 shown, the outer sheath 201 is an insulating layer made of polyvinyl chloride material, with the characteristics of wear - resistance, oil - resistance, cold - resistance, and corrosion - resistance. The braided layer 202 is braided from five - class tinned copper or bare copper outer conductors. The wrapping layer 203 is made of non - woven fabric. The core wire 204 uses polyvinyl chloride material and has the properties of wear - resistance, oil - resistance, corrosion - resistance, a high - temperature resistance of 105 °C, and a cold - resistance of - 40 °C. The conductor 205 is concentrically stranded by five - class or six - class oxygen - free copper soft conductor wires, and bullet - proof wires are added around the oxygen - free copper soft conductor wires. The filler 206 is a nylon rope;

[0050] Among them, the insulating layer of the outer sheath 201 can be replaced from the original polyvinyl chloride material to poly - amino - ester material. The wrapping layer 203 can be replaced from non - woven fabric to a flame - retardant tape. The core wire 204 can be replaced from the original polyvinyl chloride material to poly - amino - ester material. The filler 206 can be replaced from the original nylon rope to a Kevlar rope.

[0051] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 shown, the first guiding groove 303 is designed as an inclined plane. The number of clamping grooves 304 is three and they are evenly distributed on the positioning block 302. The second guiding groove 305 connects the first guiding groove 303 with the three clamping grooves 304. The size of the third guiding groove 306 is adapted to the movement track of the positioning block 302;

[0052] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, a disassembly and assembly structure 4 is provided on the link 1. The disassembly and assembly structure 4 includes an installation cavity 401. A moving block 402 is movably installed in the installation cavity 401. A clamping block 403 is fixedly installed at the bottom of the moving block 402. Limiting blocks 404 are fixedly installed on both sides of the moving block 402. A limiting groove 405 is opened inside the link 1. A return spring 406 is fixedly installed at the top of the moving block 402. A pulling block 407 is fixedly installed at the top of the moving block 402;

[0053] Insert the positioning blocks 302 on both sides of the baffle 301 into the third guiding groove 306. During this process, the first guiding groove 303 on the positioning block 302 first contacts the clamping block 403. Under the action of the first guiding groove 303, the clamping block 403 pushes the moving block 402 and the pulling block 407 upward and compresses the return spring 406. For each upward movement of a pulling block 407, the operator needs to hold it to ensure the fixed positions of the pulling block 407 and the clamping block 403. Until the positions of all three pulling blocks 407 are fixed, release the pulling block 407. Under the elastic force of the return spring 406, the clamping block 403 at the bottom of the moving block 402 can be ejected into the clamping groove 304 to complete the installation of the baffle 301, so as to achieve the separated installation of the cable structure 2. When any one of the cable structures 2 is damaged, the pulling block 407 can be pulled upward until the clamping block 403 is disengaged from the clamping groove 304, and the baffle 301 is pulled out along the third guiding groove 306, then it can be removed for the replacement of the cable structure 2.

[0054] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 shown, the installation cavity 401 is opened inside the link 1. The size of the limiting groove 405 is adapted to the moving track of the limiting block 404. The installation cavity 401 is communicated with the limiting groove 405.

[0055] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 shown, the clamping block 403 is designed in a wedge shape. The size of the clamping groove 304 is adapted to the clamping block 403. The wedge-shaped inclined surface of the clamping block 403 is adapted to the inclined surface of the first guiding groove 303;

[0056] Since the inclined surface of the first guiding groove 303 is adapted to the wedge-shaped inclined surface of the clamping block 403, when the clamping block 403 contacts the first guiding groove 303, it will move upward under the guiding action of the first guiding groove 303 to achieve the purpose of adjusting the position of the clamping block 403.

[0057] As Figure 1 、 Figure 2 、Figure 3 , Figure 5 and Figure 6 As shown in Figure 3 , Figure 5 and Figure 6 , the top of the return spring 406 is fixedly connected to the inner top wall of the installation cavity 401. The pulling block 407 is composed of a connecting rod and a pull rod. The connecting rod is fixedly installed at the top of the moving block 402 and is located at the center of the return spring 406. The pull rod extends to the top of the link 1 and its surface is in contact.

[0058] As Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown in , Figure 1 , Figure 2 and Figure 6 , a support rod 5 is fixedly installed inside the link 1. A supporting structure 6 is provided inside the link 1. The supporting structure 6 includes a base 601 fixedly installed on the inner bottom wall of the link 1 and a base 601 fixedly installed at the bottom of the baffle 301. Anti-slip pads 602 are fixedly installed on the opposite sides of the upper and lower bases 601. The anti-slip pads 602 are in close contact with the outer sheath 201 in the cable structure 2.

[0059] The link 1 can be partially supported by the support rod 5, providing a carrier for the installation of the baffle 301. The cable structure 2 can be separated and fixed by the upper and lower bases 601 to prevent it from being cross-wound inside the link 1. Under the action of the anti-slip pads 602, the cable structure 2 can be prevented from sliding on the base 601, affecting its normal use.

[0060] Working principle: First, place the outer sheath 201 of the cable structure 2 on the base 601 inside the link 1. Then, insert the positioning block 302 on the baffle 301 into the link 1 along the third guide groove 306. Under the action of the inclined surface of the first guide groove 303, the contact block 403 can be pushed upward, causing the moving block 402 and the pulling block 407 to move upward, and at the same time compressing the return spring 406. The operator needs to pinch each upward-moving pulling block 407 in turn until the position of the positioning block 302 cannot be pushed. At this time, each contact block 403 is exactly located on the corresponding card slot 304. Release the pulling block 407. Under the elastic force of the return spring 406, the contact block 403 can be ejected into the card slot 304 to complete the fixation of the position of the baffle 301. The base 601 at the bottom of the baffle 301 can fix the other side of the cable structure 2 to achieve the purpose of separating the cable structure 2. If any one of the cable structures 2 is damaged, the operator needs to pull the pulling blocks 407 on both sides of the baffle 301 corresponding to the damaged cable structure 2 upward to release the fixation of the contact block 403 on the positioning block 302, and then pull out the baffle 301 along the third guide groove 306 to remove it, and replace the damaged cable structure 2 separately.

[0061] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable, comprising a plurality of chain links (1), wherein the plurality of chain links (1) form a drag chain, characterized in that: A cable structure (2) is provided on the inner side of the chain link (1); The chain link (1) is provided with a cable blocking structure (3); The chain link (1) is provided with a disassembly and assembly structure (4); The cable structure (2) comprises an outer layer (201), a braided layer (202) is provided inside the outer layer (201), a wrapping layer (203) is provided inside the braided layer (202), a core wire (204) is provided inside the wrapping layer (203), a conductor (205) is provided inside the core wire (204), and a filler (206) is provided inside the wrapping layer (203); The cable blocking structure (3) comprises a baffle (301), positioning blocks (302) are fixedly mounted on both sides of the baffle (301), a first guide groove (303) is provided on one side of the positioning block (302), a clamping groove (304) is provided on the top of the positioning block (302), a second guide groove (305) is provided on the top of the positioning block (302), and a third guide groove (306) is provided on the chain link (1); The chain link (1) is provided with a disassembly structure (4), the disassembly structure (4) comprising an installation cavity (401), a moving block (402) being movably installed in the installation cavity (401), a clamping block (403) being fixedly installed at the bottom of the moving block (402), limiting blocks (404) being fixedly installed on both sides of the moving block (402), a limiting groove (405) being provided inside the chain link (1), a return spring (406) being fixedly installed at the top of the moving block (402), and a pulling block (407) being fixedly installed at the top of the moving block (402); The top of the reset spring (406) is fixedly connected to the inner top wall of the installation cavity (401); the pulling block (407) is composed of a connecting rod and a pulling rod; the connecting rod is fixedly installed on the top of the moving block (402) and is located at the center of the reset spring (406); the pulling rod extends to the top of the chain link (1) and its surface is in contact with it.

2. According to claim 1, a highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable is characterized by: The outer layer (201) is an insulating layer made of polyvinyl chloride material, which has the characteristics of wear resistance, oil resistance, cold resistance and corrosion resistance. The braided layer (202) is woven from a Class V tinned copper or bare copper outer conductor. The sheath (203) is made of non-woven fabric. The core wire (204) uses polyvinyl chloride material. The conductor (205) is concentrically twisted from Class V oxygen-free copper soft conductor wire or Class VI oxygen-free copper soft conductor wire, and bulletproof wire is added around the oxygen-free copper soft conductor wire. The filler (206) is a nylon rope.

3. According to claim 1, a highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable is characterized by: The first guide groove (303) is designed as an inclined surface, the number of the clamping grooves (304) is three and they are evenly spaced and distributed on the positioning block (302), the second guide groove (305) connects the first guide groove (303) with the three clamping grooves (304), and the size of the third guide groove (306) is adapted to the moving track of the positioning block (302).

4. According to claim 1, a highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable is characterized by: The installation cavity (401) is opened inside the chain link (1); the size of the limiting groove (405) is adapted to the moving track of the limiting block (404); and the installation cavity (401) is communicated with the limiting groove (405).

5. According to claim 1, a highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable, characterized in that: The clamping block (403) is designed to be wedge-shaped, the size of the clamping slot (304) is adapted to the clamping block (403), and the wedge-shaped inclined surface of the clamping block (403) is adapted to the inclined surface of the first guide groove (303).

6. The highly flexible, bend-resistant, synchronous twisted-pair shielded, flame-retardant drag chain cable according to claim 1, characterized in that: A support rod (5) is fixedly installed inside the chain link (1), and a supporting structure (6) is provided on the inner side of the chain link (1). The supporting structure (6) comprises a base (601) fixedly installed on the inner bottom wall of the chain link (1) and fixedly installed on the bottom of the baffle (301), and anti-skid pads (602) are fixedly installed on opposite sides of the base (601) at the upper and lower sides, and the anti-skid pads (602) are tightly fitted with the outer coating (201) in the cable structure (2).

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