Composite flexible cable and use method thereof

Abstract

The invention relates to the technical field of cables, in particular to a composite flexible cable and a use method thereof.The composite flexible cable comprises cable cores, protection assemblies are arranged on the outer walls of the multiple cable cores, joints are arranged on the outer walls of the two ends of each protection assembly, and multiple telescopic assemblies are arranged on the outer walls of the protection assemblies. The cable core is protected through the protection assembly, the cable core is conveniently connected with the connector, and the cable is conveniently connected with equipment. When the cable is bent, the telescopic assembly in the bending area of the cable is driven to be bent, relative acting force is formed through resilience force of the telescopic assembly and bending force, the bending state of the cable is weakened, and excessive bending of the cable is avoided; when the cable is dragged on the bottom surface, the dragging force of the cable drives the protection assembly to move in the direction opposite to the dragging direction and drives the protection assembly to rotate in the moving process, so that the abrasion position of the protection assembly in the dragging process is continuously changed along with rotation, the abrasion position is uniformly distributed, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a composite flexible cable and a use method thereof. Background Art

[0002] Composite flexible cable is a cable product with excellent performance. It is carefully combined with a variety of different materials. The conductor is usually made of copper or aluminum with high conductivity to ensure efficient current transmission. The high-quality insulation layer provides reliable electrical insulation performance to prevent current leakage and short circuit risks. The shielding layer that may be equipped effectively reduces external electromagnetic interference and ensures the stability of signal transmission. The soft, wear-resistant, oil-resistant and corrosion-resistant sheath material not only protects the internal structure of the cable, but also gives the cable excellent flexibility and durability.

[0003] In the prior art, composite flexible cables need to go through a series of steps when used. During use, existing composite flexible cables may be damaged due to accidental collisions, scratches, and other contact with sharp objects during laying and connection, resulting in damage to the insulation layer, thereby affecting electrical performance and even causing safety hazards. In addition, in some dynamic installation environments, cables need to be bent and stretched frequently, and fatigue damage may occur during frequent dynamic bending. Long-term use will gradually reduce the flexibility of the cable, and may even cause serious faults such as breakage, making it inconvenient to limit the bending degree of the cable.

[0004] In view of this, we propose a composite flexible cable and a method for using the same. Summary of the invention

[0005] The object of the present invention is to provide a composite flexible cable and a method of using the same to solve the problems raised in the above background technology.

[0006] To achieve the above object, one of the objects of the present invention is to provide a composite flexible cable, comprising a cable core, a plurality of cable cores having outer walls provided with protective components, outer walls at both ends of the protective components having joints, and the outer walls of the protective components having multiple telescopic components;

[0007] The telescopic component is used to assist the protective component and multiple cable cores in bending. While assisting in the bending, the telescopic component can also drive the protective component to move between the two joints. The protective component is used to protect multiple cable cores. While protecting, the protective component can also rotate around the outer walls of the multiple cable cores to reduce friction.

[0008] As a further improvement of the present technical solution, the protective assembly includes a protective shell, two of the protective shells symmetrically form a ring, a plurality of the rings are movably connected to the outer walls of a plurality of cable cores, and a rotating part is threadedly connected to the inner wall of the joint.

[0009] As a further improvement of the present technical solution, the protective shell includes a shell, the inner wall of the shell is provided with an inner coating, the inner coating is made of polytetrafluoroethylene, and the outer wall of the shell is provided with a protective layer, and the protective layer is made of polyurethane.

[0010] As a further improvement of the technical solution, the rotating member includes a rotating block, a telescopic assembly is provided between the rotating block and the multiple rings, the outer wall of the rotating block is fixedly connected with bolts, and the bolts and the rotating block are movably connected inside the joint.

[0011] As a further improvement of the technical solution, the telescopic assembly includes a slider, a slide groove is provided at the symmetrical connection at both ends of the two protective shells, and two grooves are symmetrically provided on the outer wall of the rotating block close to one end of the protective shell. A plurality of sliders are movably connected between the slide groove and the groove, and an elastic part is fixedly connected between the two symmetrical sliders, and a snap-fit ​​part is provided inside the slider.

[0012] As a further improvement of the present technical solution, the fastener includes a gear, which is movably connected inside the slider, and blocks are provided at both ends of the slider. The two sliders are coaxially connected to the gear, and the multiple blocks are respectively movably connected inside the protective shell and the rotating block.

[0013] The second object of the present invention is to provide a method for operating a composite flexible cable as described in any one of the above, comprising the following method steps:

[0014] S1. First, multiple protective shells are symmetrically wrapped between the outer walls of multiple cable cores, and the multiple protective shells are fixed to the rotating parts through telescopic components, so that joints are provided at both ends of the cable cores;

[0015] S2. Connect the cable core to the electrical equipment through the connector and wipe the outer wall of the protective component clean;

[0016] S3. Press the two sets of symmetrical protective shells to drive the telescopic assembly to bend, thereby exposing the cable core between the two sets of symmetrical protective shells, and checking the state of the cable core;

[0017] S4. When the cable core is bent by external force, the telescopic component is bent, and the relative force is formed by the rebound force of the telescopic component and the bending force, thereby weakening the bending force of the cable core;

[0018] S5. When the protective component is dragged by the friction force of the ground, it drives the telescopic component to stretch. At the same time, its dragging force will drive the protective component to rotate between the two joints, reduce the friction force, and drive the telescopic component to stretch. When the dragging stops, the telescopic component rebounds to reset the protective component.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the composite flexible cable and the method of using the same, the cable core is protected by the protective component, and the cable core is conveniently connected to the connector, and the cable is conveniently connected to the equipment; when the cable is bent, the telescopic component in the bending area will bend, and the relative force will be formed by the elastic force of the telescopic component itself and the bending force, thereby weakening the bending state of the cable, avoiding excessive bending of the cable, reducing the pressure on the cable core, and extending the service life of the cable.

[0021] 2. In the composite flexible cable and its use method, when the cable is dragged on the bottom surface, the dragging force will drive the protective component to move in the opposite direction of the dragging, and at the same time drive the telescopic component in the dragging direction to stretch, so that the protective component is affected by the dragging force and moves toward the inside of the joint away from the dragging direction, and drives the protective component to rotate during the movement, so that the wear position of the protective component during the dragging process changes continuously with the rotation, so that the wear position is relatively evenly distributed on the circumferential surface of the cable, thereby extending the overall service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the protection component of the present invention;

[0024] Figure 3 It is a schematic diagram of the friction rotation direction of the present invention;

[0025] Figure 4 It is a schematic diagram of the bending direction of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the rotating member of the present invention;

[0027] Figure 6 This is a schematic diagram of the material structure of the protective shell of the present invention;

[0028] Figure 7 It is a schematic diagram of the telescopic assembly structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the buckle of the present invention;

[0030] Fig. 9 It is a schematic diagram of the rotation direction of the buckle of the present invention.

[0031] The meaning of each number in the figure is:

[0032] 1. Cable core; 11. Connector;

[0033] 12. Protective assembly; 120. Protective shell; 1201. Shell; 1202. Inner coating; 1203. Protective layer; 121. Rotating member; 1210. Rotating block; 1211. Bolt;

[0034] 13. Telescopic assembly; 130. Sliding block; 131. Elastic member; 132. Buckle member; 1320. Gear; 1321. Block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] Example 1

[0038] See also Figure 1-Figure 4 As shown, the purpose of this embodiment is to provide a composite flexible cable, including a cable core 1, a plurality of cable cores 1 having outer walls provided with protective components 12, outer walls at both ends of the protective components 12 are provided with joints 11, and the outer walls of the protective components 12 are provided with a plurality of telescopic components 13;

[0039] The telescopic component 13 is used to assist the protective component 12 and the multiple cable cores 1 in bending. While assisting in the bending, the telescopic component 13 can also drive the protective component 12 to move between the two joints 11. The protective component 12 is used to protect the multiple cable cores 1. While protecting, the protective component 12 can also rotate around the outer walls of the multiple cable cores 1 to reduce friction.

[0040] The improvement of this embodiment is that: during the use of the cable, the protective component 12 is installed between the outer walls of multiple cable cores 1, and the length of the protective component 12 is flexibly adjusted according to the cable cores 1 of different lengths, so that it is convenient to adapt to cables of various specifications; the cable core 1 is protected by the protective component 12, and various potential damaging factors from the outside are effectively isolated, and at the same time, the connection between the cable core 1 and the connector 11 is driven, so as to build a solid bridge for the smooth connection between the cable and the equipment;

[0041] When the cable is bent during use, its bent area will drive the telescopic component 13 to bend. At this time, the telescopic component 13 forms a relative force with its own resilience and bending force, which effectively weakens the bending state of the cable, avoids excessive bending of the cable, reduces the pressure on the cable core 1, and thus extends the service life of the cable.

[0042] When the cable is dragged on the bottom surface, the dragging force will drive the protective component 12 to move in the opposite direction of the dragging, so that the protective component 12 is affected by the dragging force and moves toward the inside of the connector 11 away from the dragging direction. During this movement, the protective component 12 drives itself to rotate. In this way, when the protective component 12 is worn during the dragging process, the wear position will change continuously with the rotation, so that the wear position is relatively evenly distributed on the circumferential surface of the cable, effectively extending the service life of the entire cable and ensuring that the cable can maintain stable and reliable performance in various complex use environments; at the same time, the telescopic component 13 in the dragging direction will be stretched, and when the cable dragging stops, it is convenient to drive the protective component 12 to reset.

[0043] First, the specific structure of the protection component 12 is disclosed. The protection component 12 includes a protection shell 120. Two protection shells 120 are symmetrically formed into a ring. Multiple rings are movably connected to the outer walls of multiple cable cores 1. The inner wall of the joint 11 is threadedly connected with a rotating member 121.

[0044] See also Figure 1 and Figure 2 As shown, two protective shells 120 are symmetrically wrapped between the outer walls of multiple cable cores 1, and the position between the two symmetrical protective shells 120 is fixed by the telescopic component 13. At the same time, the telescopic component 13 connects the multiple symmetrical protective shells 120, and connects the two groups of symmetrical protective shells 120 near the two ends of the cable core 1 to the rotating member 121, which is threadedly connected to the joint 11 through the rotating member 121, so that the electrical equipment is conveniently connected to the cable core 1 through the joint 11;

[0045] The protective shell 120 includes a shell 1201, an inner wall of the shell 1201 is provided with an inner coating 1202, the inner coating 1202 is made of polytetrafluoroethylene, and an outer wall of the shell 1201 is provided with a protective layer 1203, the protective layer 1203 is made of polyurethane;

[0046] See also Figure 6 As shown, the polytetrafluoroethylene material characteristics of the inner coating 1202 make it have excellent electrical insulation performance, high temperature resistance, corrosion resistance and low friction coefficient, etc., which can effectively prevent short circuit and leakage between the conductors of the cable core 1, and improve the safety and reliability of the cable; the material characteristics of the polyurethane of the protective layer 1203 make it have good wear resistance, corrosion resistance, oil resistance and weather resistance, etc., which can effectively protect the shell 1201 from the influence of the external environment and improve the overall service life of the protective shell 120;

[0047] The rotating member 121 includes a rotating block 1210, and a telescopic assembly 13 is provided between the rotating block 1210 and the plurality of rings. A bolt 1211 is fixedly connected to the outer wall of the rotating block 1210, and the bolt 1211 and the rotating block 1210 are movably connected to the inside of the joint 11.

[0048] See also Figure 2 and Figure 5 As shown, the rotating block 1210 is threadedly connected to the inner wall of the joint 11 through the bolt 1211, and the rotating block 1210 is connected to the protective shell 120 through the telescopic component 13, so as to connect the cable core 1 with various electrical equipment, instruments and meters, etc.

[0049] Secondly, the specific structure of the telescopic assembly 13 is disclosed. The telescopic assembly 13 includes a slider 130. A slide groove is provided at the symmetrical connection between the two ends of the two protective shells 120. The outer wall of the rotating block 1210 close to one end of the protective shell 120 is symmetrically provided with two grooves. A plurality of sliders 130 are movably connected between the slide groove and the groove, and an elastic member 131 is fixedly connected between the two symmetrical sliders 130. A snap member 132 is provided inside the slider 130.

[0050] See also Figure 7 As shown, the slider 130 is conveniently connected between the slide grooves of the two symmetrical protective shells 120 through the snap member 132, and the snap member 132 also drives the slider 130 to be connected to the inside of the groove of the rotating block 1210, and the elastic member 131 between the two sliders 130 is elastically contracted to drive the two sliders 130 to approach each other, so as to clamp and connect the two groups of symmetrical protective shells 120, and clamp and connect the protective shells 120 to the ends of the rotating block 1210, so that multiple protective shells 120 are wrapped and fixed between the outer walls of multiple cable cores 1, so as to protect the cable cores 1;

[0051] The buckle 132 includes a gear 1320, which is movably connected to the inside of the slider 130, and blocks 1321 are provided at both ends of the slider 130. The two sliders 130 are coaxially connected to the gear 1320, and the multiple blocks 1321 are movably connected to the inside of the protective shell 120 and the rotating block 1210 respectively;

[0052] See also Figure 8 and Fig. 9 As shown, by moving the block 1321 along the slide groove of the protective shell 120 or the groove of the rotating block 1210 to the end of the slide groove or the groove, when the block 1321 moves to the end of the slide groove or the groove, the operator manually turns the teeth on the gear 1320, so that the gear 1320 rotates inside the slider 130, and the coaxial rotation drives the two blocks 1321 to flip inside the slide groove of the protective shell 120 or the groove of the rotating block 1210, so that when the slider 130 is subjected to a lateral tensile force, the flipped block 1321 will drive the slider 130 to be fixed inside the slide groove of the protective shell 120 or the groove of the rotating block 1210, so as to facilitate the connection and fixation of the two protective shells 120, and fix the position between the protective shell 120 and the rotating block 1210 at the same time;

[0053] See also Figure 4 As shown, when the cable is bent during use, its bending force will drive the elastic member 131 in the area to be stretched by the bending force. Since the elastic member 131 has the characteristic of elastic deformation, it will be stretched after being subjected to the bending force; when the elastic member 131 is stretched, its rebound force will form a relative force with the bending force of the cable, and this relative force will have a certain offsetting effect on the bending force on the one hand; it makes the cable tend to bend further through the bending force, while the rebound force tries to restore the cable to a relatively straight state, thereby reducing the bending degree of the cable; on the other hand, the relative force makes the cable in a dynamic equilibrium state in the bending area, and as the cable continues to bend or recover, the rebound force and the bending force will be continuously adjusted to maintain this balance, which can limit the excessive bending of the cable to a certain extent, protect the cable core 1, reduce the risk of damage caused by excessive bending, and improve the service life and reliability of the cable;

[0054] See also Figure 3As shown, when the cable is dragged on the ground during use, its dragging force will drive the protective shell 120 to rub against the bottom surface, and at the same time, its dragging force will also drive the protective shell 120 to move in the opposite direction of the dragging force. The movement of the protective shell 120 will drive the elastic member 131 located between the rotating block 1210 and the protective shell 120, which is close to the dragging direction, to stretch. At the same time, the rotating block 1210, which is far away from the dragging direction, is pushed and moves in the opposite direction to the dragging force inside the joint 11. When the rotating block 1210 moves, it drives the bolt 1211 to move in the joint 1 1, the bolt 1211 drives the rotating block 1210 to rotate along its thread during the movement, so that the rotating block 1210 rotates, and drives the multiple protective shells 120 and the cable core 1 to rotate, so that the protective shell 120 is subjected to the dragging friction of the ground, and the rotation of the protective shell 120 drives the position of its wear to change continuously with the rotation, so that the wear is relatively evenly distributed on the circumferential surface of the cable, avoiding excessive concentration of friction stress in a certain place, reducing the wear depth of a single position of the protective shell 120, and extending the service life of the entire cable;

[0055] When the dragging force stops, the elastic member 131 between the rotating block 1210 and the protective shell 120 rebounds close to the dragging direction, forming a pulling force on the protective shell 120 and the rotating block 1210 away from the dragging direction, pulling the rotating block 1210 away from the dragging direction to reset it to the end of the joint 11 close to the protective shell 120, and resetting the overall protective position of the protective shell 120.

[0056] Example 2

[0057] This embodiment is based on the content provided in Embodiment 1, and aims to provide a method for using a composite flexible cable, and the specific steps are as follows:

[0058] S1. First, two protective shells 120 are symmetrically wrapped between the outer walls of multiple cable cores 1; then, the block 1321 is moved along the slide groove of the protective shell 120 or the groove of the rotating block 1210 toward its end; when the block 1321 reaches the end of the slide groove or the groove, the operator manually turns the teeth on the gear 1320 to cause the gear 1320 to rotate inside the slider 130; since the gear 1320 is coaxial with the two blocks 1321, the rotation of the gear 1320 will drive the two blocks 1321 to flip inside the slide groove of the protective shell 120 or the groove of the rotating block 1210; in this way, when the slider 130 is subjected to a lateral tensile force, the flipped block 1321 can drive the slider 130 to be firmly fixed inside the slide groove of the protective shell 120 or the groove of the rotating block 1210;

[0059] S2. The two sliders 130 are brought closer to each other through the elastic contraction of the elastic member 131 between the two sliders 130; thereby, the two sets of symmetrical protective shells 120 are clamped and connected, and the protective shells 120 are clamped and connected to the ends of the rotating block 1210; in this way, the multiple protective shells 120 can be tightly wrapped and fixed between the outer walls of the multiple cable cores 1, providing effective protection for the cable cores 1;

[0060] S3. Use the bolt 1211 to drive the rotating block 1210 to be threadedly connected to the inner wall of the joint 11; connect the rotating block 1210 to the protective shell 120 with the telescopic component 13 to achieve the connection between the cable core 1 and various electrical equipment, instruments and meters; after completing the connection, wipe the outer wall of the protective shell 120 to ensure that its surface is clean;

[0061] S4. When the cable is bent during use, the bending force will drive the elastic member 131 in the area to be stretched due to the bending force; since the elastic member 131 has the characteristic of elastic deformation, it will be stretched after being subjected to the bending force; when the elastic member 131 is stretched, its resilience will form a relative force with the bending force of the cable; this relative force can, on the one hand, offset the bending force to a certain extent, limit the excessive bending of the cable to a certain extent, protect the cable core 1, reduce the risk of damage caused by excessive bending, and thus improve the service life and reliability of the cable;

[0062] S5. When the cable is dragged on the ground during use, the dragging force will drive the protective shell 120 to rub against the bottom surface; at the same time, the dragging force will also cause the protective shell 120 to move in the opposite direction of the dragging force; when the protective shell 120 moves, it will drive the elastic member 131 located between the rotating block 1210 and the protective shell 120 close to the dragging direction to stretch; and the rotating block 1210 away from the dragging direction will be pushed and move in the opposite direction of the dragging force inside the connector 11;

[0063] S6. When the rotating block 1210 moves, it will drive the bolt 1211 to move inside the connector 11; since the bolt 1211 is threadedly connected to the rotating block 1210, the rotating block 1210 will rotate along the thread during the movement; the rotation of the rotating block 1210 will drive the multiple protective shells 120 and the cable core 1 to rotate; in this way, when the protective shell 120 is subjected to the dragging friction of the ground, the rotation of the protective shell 120 will cause the position of the wear to change continuously with the rotation, so that the wear is relatively evenly distributed on the circumferential surface of the cable; thereby avoiding excessive concentration of friction stress in a certain place, reducing the wear depth of a single position of the protective shell 120, and extending the service life of the entire cable;

[0064] S7. When the dragging force stops, the elastic member 131 located between the rotating block 1210 and the protective shell 120 and close to the dragging direction rebounds; the rebound of the elastic member 131 will form a pulling force on the protective shell 120 and the rotating block 1210 away from the dragging direction, pulling the rotating block 1210 away from the dragging direction to reset it to the end of the joint 11 close to the protective shell 120, thereby resetting the overall protective position of the protective shell 120.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A composite flexible cable, comprising a cable core (1), characterized in that: The outer walls of the plurality of cable cores (1) are provided with protective components (12), the outer walls at both ends of the protective components (12) are provided with joints (11), and the outer walls of the protective components (12) are provided with a plurality of telescopic components (13); The telescopic component (13) is used to assist the protective component (12) and the plurality of cable cores (1) in bending. While assisting the bending, the telescopic component (13) can also drive the protective component (12) to move between the insides of the two joints (11). The protective component (12) is used to protect the plurality of cable cores (1). While protecting, the protective component (12) can also rotate around the outer walls of the plurality of cable cores (1) to reduce friction.

2. The composite flexible cable according to claim 1, characterized in that: The protection component (12) comprises a protection shell (120), two of the protection shells (120) symmetrically form a ring, a plurality of the rings are movably connected to the outer walls of a plurality of cable cores (1), and a rotating part (121) is threadedly connected to the inner wall of the joint (11).

3. The composite flexible cable according to claim 2, characterized in that: The protective shell (120) comprises a shell (1201), the inner wall of the shell (1201) is provided with an inner coating (1202), the inner coating (1202) is made of polytetrafluoroethylene, and the outer wall of the shell (1201) is provided with a protective layer (1203), the protective layer (1203) is made of polyurethane.

4. The composite flexible cable according to claim 2, characterized in that: The rotating member (121) comprises a rotating block (1210), a telescopic assembly (13) is provided between the rotating block (1210) and the plurality of circular rings, a bolt (1211) is fixedly connected to the outer wall of the rotating block (1210), and the bolt (1211) and the rotating block (1210) are movably connected inside the joint (11).

5. The composite flexible cable according to claim 4, characterized in that: The telescopic assembly (13) comprises a slider (130), a slide groove is provided at the symmetrical connection between the two ends of the two protective shells (120), and two grooves are symmetrically provided on the outer wall of the rotating block (1210) close to one end of the protective shell (120), and a plurality of sliders (130) are movably connected between the slide groove and the groove, and an elastic member (131) is fixedly connected between the two symmetrical sliders (130), and a snap-fit ​​member (132) is provided inside the slider (130).

6. The composite flexible cable according to claim 5, characterized in that: The locking member (132) comprises a gear (1320), the gear (1320) is movably connected inside the slider (130), both ends of the slider (130) are provided with a clamping block (1321), the two sliders (130) are coaxially connected to the gear (1320), and the plurality of clamping blocks (1321) are respectively movably connected inside the protective shell (120) and the rotating block (1210).

7. A method for operating a composite flexible cable according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. First, a plurality of protective shells (120) are symmetrically wrapped between the outer walls of a plurality of cable cores (1), and the plurality of protective shells (120) are fixed to the rotating member (121) by a telescopic assembly (13), so that joints (11) are provided at both ends of the cable core (1); S2. Connect the cable core (1) to the electrical equipment through the connector (11), and clean the outer wall of the protective component (12); S3, pressing the two sets of symmetrical protective shells (120) to drive the telescopic assembly (13) to bend, thereby exposing the cable core (1) between the two sets of symmetrical protective shells (120), and inspecting the state of the cable core (1); S4. When the cable core (1) is bent by an external force, the telescopic component (13) is bent, and a relative force is formed between the self-rebound force of the telescopic component (13) and the bending force, thereby weakening the bending force of the cable core (1); S5. When the protective component (12) is subjected to the dragging friction force of the ground, the telescopic component (13) is driven to stretch. At the same time, the dragging force drives the protective component (12) to rotate between the two joints (11), thereby reducing the friction force and driving the telescopic component (13) to stretch. When the dragging stops, the telescopic component (13) rebounds to reset the protective component (12).

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