A multi-core insulated cable for power transmission lines and its stranding device

Abstract

This application relates to the field of cable stranding technology, specifically disclosing a multi-core insulated cable for transmission lines and its stranding device, including an installation plate with movable columns on the installation plate. Cables pass through the movable columns, and two sets of safety mechanisms are symmetrically arranged on the movable columns. Limiting structures are provided on the installation plate and the movable columns. The safety mechanisms in this application trigger braking when the cable breaks, and the limiting structures constrain the movement of the movable columns during braking. The installation plate and the movable columns provide multi-directional guidance, making the multi-core cable stranding process uniform and orderly, improving the stranding quality. At the same time, the safety mechanisms on the movable columns automatically respond to cable breakage and quickly brake to prevent equipment damage or personal injury caused by cable swinging. The limiting structures enhance braking stability and prevent excessive displacement of the movable columns from causing device failure.

Description

Technical Field

[0001] This application relates to the field of cable stranding technology, and in particular to a multi-core insulated cable for power transmission lines and a stranding device thereof. Background Technology

[0002] Multi-core insulated cables are power transmission cables composed of multiple independently insulated conductors twisted together and encased in an outer sheath. They are widely used in critical areas such as medium- and high-voltage power transmission, urban power grids, and industrial power supply. The stranding process is a core aspect of manufacturing, directly determining the cable's mechanical strength, flexibility, electrical performance, and long-term operational reliability. Precise stranding ensures stable positioning and uniform stress distribution among the conductors, effectively preventing internal stress concentration and thus enhancing overall structural integrity and interference resistance.

[0003] In existing technologies, the unwinding and take-up sections of stranding devices typically employ passive tension control of the pay-off reel using methods such as mechanical friction braking, magnetic powder clutches, or torque motors. This involves roughly limiting the pay-off tension of the conductor by adjusting friction or current. At the take-up end, slip differential winding or ordinary torque motor winding is commonly used, along with a cable guide to ensure the cable is neatly arranged on the take-up reel. To maintain relatively stable tension, some devices incorporate a mechanical rocker arm between the pay-off reel and the stranding head. The displacement of the rocker arm provides feedback on tension fluctuations, which are then finely modulated via pneumatic or electric means to control the braking force of the actuator.

[0004] Regarding the aforementioned technologies, firstly, their passive and crude control mode leads to severe tension fluctuations during start-up, shutdown, or speed changes. This can easily cause internal damage or even breakage of individual conductors due to instantaneous overtension. Such internal breaks are difficult to detect in time after stranding and wrapping, forming hidden defects. Secondly, when a conductor suddenly breaks during high-speed stranding, the unwinding system will instantly lose tension. The broken conductor end will violently rebound and swing under the drive of residual tension and elastic potential energy, which is extremely dangerous. Therefore, improvements are needed to address these issues. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a multi-core insulated cable for power transmission lines and a stranding device thereof.

[0006] This application provides a multi-core insulated cable for power transmission lines and a stranding device thereof, which adopts the following technical solution: A multi-core insulated cable stranding device for power transmission lines includes an installation platform. A wire-laying reel and a wire-receiving reel are fixedly mounted on the installation platform. Multiple sets of installation discs are fixedly spaced between the wire-receiving and wire-receiving reels. Multiple sets of movable columns are movably arranged on the installation discs corresponding to the number of cable strands, and these movable columns are arranged in a uniform circumferential array around the center of the installation disc. Multiple cable strands pass through these movable columns. Two sets of safety mechanisms are symmetrically arranged on each movable column. These safety mechanisms are used for emergency braking of the cable end in case of breakage, preventing the cable end from swinging. Multiple sets of limiting structures are provided on the installation discs and movable columns corresponding to the number of movable groups to limit the displacement of the movable columns during emergency braking.

[0007] By adopting the above technical solution, the cable delivery reel and take-up reel achieve cable delivery and take-up through rotation. The mounting plate provides support, and the movable column guides the cable movement on the mounting plate. The safety mechanism triggers braking when the cable breaks, and the limiting structure constrains the movement of the movable column during braking. The cable delivery reel and take-up reel in this application ensure smooth cable delivery and reduce tangling. Multiple sets of mounting plates and movable columns provide multi-directional guidance, making the multi-core cable stranding process uniform and orderly, improving the stranding quality. At the same time, the safety mechanism on the movable column automatically responds to cable breakage and quickly brakes to prevent equipment damage or personal injury caused by cable swinging. The limiting structure enhances braking stability and prevents excessive displacement of the movable column from causing device failure.

[0008] Optionally, the safety mechanism includes a movable block, a sliding block, a telescopic column, a first elastic element, and an adjustment assembly. Multiple sets of the movable block, the sliding block, the telescopic column, and the first elastic element are arranged in a uniform circumferential array centered on the cable. The movable block includes an integrally formed first movable segment, a second movable segment, and a third movable segment. The second movable segment is located between the first and third movable segments. The thickness of the first movable segment is greater than that of the third movable segment. The side of the second movable segment away from the cable is inclined. The end face of the first movable segment is located near the movable column. The movable column has a movable groove corresponding to the movable block. The movable groove includes a first groove segment, a second groove segment, and a third groove segment. The depth of the first groove segment is the same as the thickness of the first movable segment, and the depth of the third groove segment is the same as the thickness of the third movable segment. The second groove segment is located between the first groove segment and the second groove segment, and is inclined to correspond to the second movable segment. When the movable block moves into the movable groove, the second movable segment abuts against the inclined groove wall of the second groove segment. A sliding groove is provided in the movable column, and the sliding block is slidably disposed in the sliding groove. One end of the telescopic column is fixedly connected to the third movable segment, and the other end is fixedly connected to the sliding block. The first elastic element is sleeved on the telescopic column. The adjustment component is disposed on the third movable segment and the sliding block, and is used to enable the movable block to press against and separate from the cable.

[0009] By adopting the above technical solution, when the cable breaks, the movable block abuts against the cable under the action of the adjusting component, generating friction between the cable and the movable block. This friction drives the movable block to move into the movable groove. At the same time, since the second movable section abuts against the inclined groove wall, the movable block moves further towards the cable as it moves into the movable groove, thereby further increasing the squeezing friction between the cable and the movable block. This achieves emergency braking of the broken cable end. In addition, the inclined design of the second movable section of the movable block can increase the contact area and improve the braking force during braking. The circumferential array setting ensures all-round braking of the cable and avoids single-point failure.

[0010] Optionally, the adjustment component includes a first electromagnet and a second electromagnet, wherein the first electromagnet is embedded in the side of the sliding block near the movable block, and the second electromagnet is embedded in the side of the third movable segment near the sliding block.

[0011] By employing the above technical solution, the energization and de-energization of the first and second electromagnets generate magnetic attraction or repulsion, driving the movable block to move towards or away from the cable, achieving pressure contact or separation. The electromagnets offer rapid control response, achieving millisecond-level braking triggering and improving safety; magnetic force adjustment eliminates mechanical contact, reducing wear, extending service life, and allowing for remote or automated control, integrating into system monitoring and enhancing the device's intelligence; during normal operation, the electromagnets keep the movable block separated from the cable, reducing friction and energy consumption; in the event of breakage, the electromagnets activate, ensuring the movable block remains firmly against the cable, ensuring reliable braking.

[0012] Optionally, the limiting structure includes a first limiting block, a second limiting block, and a second elastic element. A first limiting groove is provided in the mounting plate, and both the first and second limiting blocks are slidably disposed in the limiting groove. The second elastic element is disposed between the first and second limiting blocks, and its two ends are fixedly connected to the first and second limiting blocks, respectively. A second limiting groove is provided on the movable column, and the ends of the first and second limiting blocks near the movable column are slidably disposed in the second limiting groove. The first and second limiting grooves have the same length, and under normal conditions, the first and second limiting blocks are located at the two ends of the second limiting groove, respectively.

[0013] By adopting the above technical solution, during emergency braking, the displacement of the movable column pushes the first or second limiting block to slide within the first and second limiting grooves, while the second elastic element compresses or stretches, limiting the movement range of the movable column. The limiting block and the second elastic element work together to provide elastic limiting and reset, buffering the impact of the movable column and preventing damage from hard collisions. Under normal conditions, the limiting block is located at both ends of the second limiting groove, allowing the movable column to move freely without affecting cable transmission. During braking, the limiting structure ensures that the displacement of the movable column is within a safe range, preventing it from dislodging or jamming. Overall, this enhances the stability and reliability of the device and extends the lifespan of the components.

[0014] Optionally, the end of the movable column is provided with multiple sets of mounting slots, which are spaced apart and evenly spaced along the axis of the movable column. A detection block is provided in the mounting slot, and a third elastic element is provided between the detection block and the inner wall of the mounting slot. When a wire breaks or is missing inside the cable, it causes the detection block to move radially. The detection block is provided with a detection component for detecting the radial movement of the detection block.

[0015] By adopting the above technical solution, when the cable vibrates or jumps abnormally, the detection block moves radially within the mounting groove through the third elastic element. The detection block responds to internal breaks or missing parts of the cable through elastic contact, and the detection component monitors the jump to achieve early fault detection. In addition, the third elastic element provides a reset force to ensure that the detection block continues to contact the cable, improving detection accuracy. Radial jump detection covers the circumference of the cable, avoiding missed detections. Timely detection of abnormalities can prevent further damage to the cable and reduce production interruptions.

[0016] Optionally, the detection component includes a laser emitter and a laser receiver. Multiple sets of laser emitters are provided corresponding to the detection blocks. The multiple sets of laser emitters are fixed and embedded on the side of the multiple sets of detection blocks away from the movable column. Multiple sets of laser receivers are provided. The multiple sets of laser receivers are evenly spaced around the cable on the side of adjacent mounting plates that are close to each other. The laser receivers are electrically connected to the first electromagnet and the second electromagnet.

[0017] By adopting the above technical solutions, the laser emitter changes position and the laser receiver receives a different signal when the detection block jumps, resulting in high laser detection accuracy, the ability to capture minute jumps, and improved fault detection sensitivity. Electrical connections are automatically controlled, and a safety mechanism is immediately activated when an abnormality is detected, shortening the response time and facilitating the location of cable problems. The circumferential laser receiver ensures all-round monitoring and enhances system reliability. Automated detection reduces manual intervention and improves production efficiency.

[0018] Optionally, a baffle is provided between adjacent movable blocks located on the same movable column and on the same horizontal line.

[0019] By adopting the above technical solution, the baffle is fixed on the movable column, isolating adjacent movable blocks, preventing the movable blocks from interfering with each other during movement, ensuring that each movable block moves independently, and improving braking uniformity.

[0020] Optionally, both the movable block and the detection block have an elastic friction layer on the side closest to the cable.

[0021] By adopting the above technical solution, the elastic friction layer directly contacts the cable surface, generating friction during braking or testing. The elastic friction layer increases the friction force, improves the clamping force during braking, prevents cable slippage, and buffers contact impact, reducing damage to the cable insulation layer and protecting the cable integrity. During testing, the elastic friction layer ensures that the test block fits snugly against the cable, enhancing the reliability of signal transmission.

[0022] This application also includes a multi-core insulated cable for power transmission lines: The cable includes a first main wire, with multiple strands of first secondary wire wound around the outside of the first main wire, multiple sets of second main wires wound around the outside of the multiple sets of first secondary wires, and multiple strands of second secondary wires wound around the outside of the second main wires. The diameter of the first main wire is larger than the diameter of the second main wire, and the diameter of the second main wire is larger than both the first and second secondary wires. The diameters of the first and second secondary wires are the same. The multiple strands of second secondary wires are covered with a protective layer, which consists of a wrapping layer, a shielding layer, and an outer sheath from the inside out.

[0023] By adopting the above technical solution and using a multi-layer concentric loop cable structure with "main line-secondary line" integration, different specifications of wire cores are integrated in a hierarchical nesting manner, achieving the core advantages of high-density cabling and multi-functional integrated transmission. This not only greatly improves space utilization, enabling a single cable to simultaneously carry high current and multiple control signals, simplifying system cabling, but its unique structure also naturally forms multiple layers of electromagnetic shielding, effectively ensuring signal integrity. Furthermore, the interlocking design enhances the cable's mechanical stability and tensile strength.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. When the cable breaks, the movable block, under the action of the adjusting component, comes into contact with the cable, generating friction between the cable and the movable block. This friction drives the movable block to move into the movable groove. Simultaneously, because the second movable section abuts against the inclined groove wall, the movable block moves further towards the cable as it moves into the groove, thereby further increasing the squeezing friction between the cable and the movable block. This achieves emergency braking of the broken cable end, preventing equipment damage or personal injury caused by cable swinging. In addition, the inclined design of the second movable section of the movable block increases the contact area during braking, improving braking force. The circumferential array arrangement ensures all-round braking of the cable, avoiding single-point failure. 2. When the cable vibrates or jumps abnormally, the detection block moves radially within the mounting groove via a third elastic element. The detection block responds to internal breaks or missing parts of the cable through elastic contact. Simultaneously, the position of the laser emitter changes as the detection block jumps, and the signal received by the laser receiver changes accordingly. Laser detection offers high accuracy, capturing minute jumps and improving fault detection sensitivity. Electrical connections are automatically controlled; a safety mechanism is immediately activated upon detecting an anomaly, shortening response time and facilitating cable problem location. A circumferentially positioned laser receiver ensures comprehensive monitoring, enhancing system reliability. Automated detection reduces manual intervention and improves production efficiency. 3. During emergency braking, the displacement of the movable column pushes the first or second limiting block to slide within the first and second limiting grooves, while the second elastic element compresses or stretches, limiting the movement range of the movable column. The limiting block and the second elastic element work together to provide elastic limiting and reset, buffering the impact of the movable column and preventing damage from hard collisions. Under normal conditions, the limiting block is located at both ends of the second limiting groove, allowing the movable column to move freely without affecting cable transmission. During braking, the limiting structure ensures that the displacement of the movable column is within a safe range, preventing it from dislodging or jamming. This enhances the overall stability and reliability of the device and extends the lifespan of the components. 4. The cable employs a multi-layer concentric loop structure with "main line-secondary line" integration. By integrating cores of different specifications in a nested manner, it achieves the core advantages of high-density cabling and multi-functional integrated transmission. This not only significantly improves space utilization, enabling a single cable to simultaneously carry high current and multiple control signals, simplifying system cabling, but its unique structure also naturally forms multiple layers of electromagnetic shielding, effectively ensuring signal integrity. Furthermore, the interlocking design enhances the cable's mechanical stability and tensile strength. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is an overall schematic diagram of the installation disk; Figure 3 This is a cross-sectional structural diagram of the installation disk; Figure 4 This is a schematic diagram of the entire movable column; Figure 5 This is a schematic diagram of the overall structure of the security agency; Figure 6 This is a schematic diagram of the cross-sectional structure of the cable.

[0027] Reference numerals: 1. Mounting platform; 11. Cable reel; 12. Cable take-up reel; 13. Mounting plate; 131. Movable column; 2. Safety mechanism; 21. Movable block; 22. Sliding block; 23. Telescopic column; 24. First elastic element; 25. Adjustment assembly; 251. First electromagnet; 252. Second electromagnet; 3. Limiting structure; 31. First limiting block; 32. Second limiting block; 33. Second elastic element; 4. Mounting groove; 41. Detection block; 42. Third elastic element; 5. Detection assembly; 51. Laser emitter; 52. Laser receiver; 6. Baffle; 7. Elastic friction layer; 8. First main line; 81. Second main line; 82. First auxiliary line; 83. Second auxiliary line; 84. Wrapping layer; 85. Shielding layer; 86. Outer sheath. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0029] This application discloses a multi-core insulated cable for power transmission lines and a stranding device thereof, with reference to... Figure 1 , Figure 2 and Figure 3 A multi-core insulated cable stranding device for power transmission lines includes a mounting platform 1. A wire-laying reel 11 and a wire-receiving reel 12 are fixedly mounted on the mounting platform 1. Multiple sets of mounting discs 13 are fixedly spaced between the wire-receiving reel 12 and the wire-laying reel 11. Multiple sets of movable columns 131 are movably mounted on the mounting discs 13 according to the number of cable strands, and the multiple sets of movable columns 131 are arranged in a uniform circumferential array centered on the center of the mounting disc 13. Multiple cable strands pass through the multiple sets of movable columns 131. Two sets of safety mechanisms 2 are symmetrically mounted on the movable columns 131. The safety mechanisms 2 are used for emergency braking of the cable end in case of breakage to prevent the cable end from swinging. Multiple sets of limiting structures 3 are installed on the mounting discs 13 and movable columns 131 according to the number of movable groups, used to limit the displacement of the movable columns 131 during emergency braking.

[0030] The cable release and take-up reel 11 are achieved by rotating the cable. The mounting plate 13 provides support, and the movable column 131 moves on the mounting plate 13 to guide the cable movement. The safety mechanism 2 triggers braking when the cable breaks, and the limiting structure 3 restrains the movement of the movable column 131 during braking. The cable release and take-up reel 11 and the movable column 12 in this application ensure smooth cable delivery and reduce tangling. Multiple sets of mounting plates 13 and movable columns 131 provide multi-directional guidance, making the multi-core cable stranding process uniform and orderly, improving the stranding quality. At the same time, the safety mechanism 2 on the movable column 131 automatically responds to cable breakage and brakes quickly to prevent equipment damage or personal injury caused by cable swinging. The limiting structure 3 enhances braking stability and prevents excessive displacement of the movable column 131 from causing device failure.

[0031] Reference Figure 3 Safety mechanism 2 includes a movable block 21, a sliding block 22, a telescopic column 23, a first elastic element 24, and an adjustment assembly 25. Multiple sets of the movable block 21, sliding block 22, telescopic column 23, and first elastic element 24 are arranged in a uniform circumferential array centered on the cable. The movable block 21 includes an integrally formed first movable segment, a second movable segment, and a third movable segment. The second movable segment is located between the first and third movable segments. The thickness of the first movable segment is greater than that of the third movable segment. The side of the second movable segment away from the cable is inclined. The end face of the first movable segment is located near the movable column 131. A movable groove is formed on the movable column 131 corresponding to the movable block 21. The movable groove includes a first groove segment and a second groove segment. The first and third movable sections have the same depth as the first movable section and the same depth as the third movable section. The second movable section is located between the first and second movable sections and is inclined to correspond to the second movable section. When the movable block 21 moves into the movable groove, the second movable section abuts against the inclined groove wall of the second movable section. A sliding groove is provided in the movable column 131, and the sliding block 22 is slidably disposed in the sliding groove. One end of the telescopic column 23 is fixedly connected to the third movable section, and the other end is fixedly connected to the sliding block 22. The first elastic element 24 is sleeved on the telescopic column 23. The adjustment component 25 is disposed on the third movable section and the sliding block 22 to make the movable block 21 press against and separate from the cable.

[0032] When the cable breaks, the movable block 21 comes into contact with the cable under the action of the adjusting component 25. Friction is generated between the cable and the movable block 21, and the friction drives the movable block 21 to move into the movable groove. At the same time, since the second movable section comes into contact with the inclined groove wall, the movable block 21 moves further towards the cable as it moves into the movable groove, thereby further increasing the squeezing friction between the cable and the movable block 21. This achieves emergency braking of the broken cable end. In addition, the inclined design of the second movable section of the movable block 21 can also increase the contact area and improve the braking force during braking. The circumferential array setting ensures all-round braking of the cable and avoids single-point failure. In this embodiment, the first elastic element 24 is a spring. The spring is a preferred method in this embodiment. In other embodiments, the first elastic element 24 can be an elastic rubber column, etc.

[0033] Reference Figure 3 The adjustment component 25 includes a first electromagnet 251 and a second electromagnet 252. The first electromagnet 251 is embedded in the surface of the sliding block 22 near the movable block 21, and the second electromagnet 252 is embedded in the surface of the third movable segment near the sliding block 22.

[0034] The energization and de-energization of the first electromagnet 251 and the second electromagnet 252 generate magnetic attraction or repulsion, driving the movable block 21 to move towards or away from the cable, achieving pressure contact or separation. The electromagnets offer rapid control response, achieving millisecond-level braking triggering and improving safety; magnetic force adjustment eliminates mechanical contact, reducing wear, extending service life, and allowing for remote or automated control, integrating into system monitoring, and enhancing the device's intelligence level; during normal operation, the electromagnets keep the movable block 21 separated from the cable, reducing friction and energy consumption; in the event of breakage, the electromagnets activate, ensuring the movable block 21 remains firmly against the cable, ensuring reliable braking.

[0035] Reference Figure 4 The limiting structure 3 includes a first limiting block 31, a second limiting block 32, and a second elastic member 33. A first limiting groove is provided in the mounting plate 13. The first limiting block 31 and the second limiting block 32 are both slidably disposed in the limiting groove. The second elastic member 33 is disposed between the first limiting block 31 and the second limiting block 32, and its two ends are fixedly connected to the first limiting block 31 and the second limiting block 32 respectively. A second limiting groove is provided on the movable column 131. The ends of the first limiting block 31 and the second limiting block 32 near the movable column 131 are both slidably disposed in the second limiting groove. The first limiting groove and the second limiting groove have the same length. Under normal conditions, the first limiting block 31 and the second limiting block 32 are located at the two ends of the second limiting groove respectively.

[0036] During emergency braking, the movable column 131 is displaced, pushing the first limiting block 31 or the second limiting block 32 to slide within the first and second limiting grooves. The second elastic element 33 is compressed or stretched, limiting the movement range of the movable column 131. The limiting block and the second elastic element 33 work together to provide elastic limiting and reset, buffering the impact of the movable column 131 and preventing damage from hard collisions. Under normal conditions, the limiting block is located at both ends of the second limiting groove, allowing the movable column 131 to move freely without affecting cable transmission. During braking, the limiting structure 3 ensures that the displacement of the movable column 131 is within a safe range, preventing it from dislodging or jamming. This enhances the overall stability and reliability of the device and extends the life of the components. In this embodiment, the second elastic element 33 is a spring, which is a preferred method in this embodiment. In other embodiments, the second elastic element 33 can be an elastic rubber column, etc.

[0037] Reference Figure 5 Multiple sets of mounting slots 4 are provided at the end of the movable column 131. The multiple sets of mounting slots 4 are circumferentially spaced and evenly provided along the axis of the movable column 131. A detection block 41 is installed in the mounting slot 4. A third elastic element 42 is installed between the detection block 41 and the inner wall of the mounting slot 4. When a wire breaks or is missing inside the cable, it drives the detection block 41 to move radially. A detection component 5 is provided on the detection block 41 to detect the radial movement of the detection block 41.

[0038] When the cable vibrates or jumps abnormally, the detection block 41 moves radially within the mounting groove 4 via the third elastic element 42. The detection block 41 responds to internal breakage or loss by elastically contacting the cable. The detection component 5 monitors the jump to achieve early fault detection. In addition, the third elastic element 42 provides a reset force to ensure that the detection block 41 continues to contact the cable, improving detection accuracy. Radial jump detection covers the circumference of the cable, avoiding missed detections. Timely detection of abnormalities can prevent further damage to the cable and reduce production interruptions. In this embodiment, the third elastic element 42 is a spring, which is a preferred method in this embodiment. In other embodiments, the third elastic element 42 can be an elastic rubber column, etc.

[0039] Reference Figure 2 The detection component 5 includes a laser emitter 51 and a laser receiver 52. Multiple sets of laser emitters 51 are provided for the detection block 41. The multiple sets of laser emitters 51 are fixed and embedded on the side of the multiple sets of detection blocks 41 away from the movable column 131. Multiple sets of laser receivers are provided. Multiple laser receivers 52 are evenly spaced around the cable and arranged on the side of adjacent mounting plates 13 that are close to each other. The laser receivers 52 are electrically connected to the first electromagnet 251 and the second electromagnet 252.

[0040] When the detection block 41 jumps, the position of the laser emitter 51 changes, and the laser receiver 52 receives the signal change. The laser detection has high accuracy and can capture minute jumps, improving the sensitivity of fault detection. The electrical connection realizes automatic control. When an abnormality is detected, the safety mechanism 2 is immediately activated, shortening the response time and facilitating the location of cable problems. The circumferential laser receiver 52 ensures all-round monitoring and enhances system reliability. Automated detection reduces manual intervention and improves production efficiency.

[0041] Reference Figure 3 A baffle 6 is integrally provided between adjacent movable blocks 21 located on the same movable column 131 and on the same horizontal line. The baffle 6 is fixed to the movable column 131, isolates adjacent movable blocks 21, prevents the movable blocks 21 from interfering with each other during movement, ensures that each movable block 21 moves independently, and improves braking uniformity.

[0042] Reference Figure 3Both the movable block 21 and the detection block 41 have an elastic friction layer 7 bolted to their surfaces near the cable, with the bolts embedded in the elastic friction layer 7. The elastic friction layer 7 is in direct contact with the cable surface, generating friction during braking or detection. The elastic friction layer 7 increases the friction force, improves the clamping force during braking, prevents cable slippage, and buffers contact impact, reducing damage to the cable insulation layer and protecting the cable integrity. During detection, the elastic friction layer 7 ensures that the detection block 41 is in close contact with the cable, enhancing signal transmission reliability. In this embodiment, the elastic friction layer 7 is a rough-surfaced elastic rubber layer, which is a preferred method in this embodiment. In other embodiments, the elastic friction layer 7 can be a rough-surfaced soft plastic layer.

[0043] The implementation principle of a multi-core insulated cable for power transmission lines and its stranding device in this application is as follows: When the cable outlet breaks and emergency braking is required, the first electromagnet 251 and the second electromagnet 252 control the pressing of the movable block 21 against the cable through magnetic force. Under the action of friction, the movable block 21 is driven to move into the movable groove in the movable column 131. The second movable section of the movable block 21 abuts against the inclined second groove wall in the movable groove, thereby further increasing the friction between the movable block 21 and the cable, thus realizing emergency braking of the cable.

[0044] When it is necessary to check whether there is a broken or missing strand inside the cable, the detection block 41 in the mounting groove 4 at the end of the movable column 131 contacts the cable through the third elastic element 42. The broken or missing strand inside the cable will cause the detection block 41 to move radially; the laser emitter 51 embedded in the detection block 41 moves accordingly, causing the laser signal received by the laser receiver 52 on the adjacent mounting plate 13 to change. The internal condition of the cable can be judged based on the signal change.

[0045] This application also includes a multi-core insulated cable for power transmission lines: Reference Figure 6 In industrial automation scenarios, such as automotive manufacturing welding production lines, to achieve simultaneous transmission of power and multiple control signals, as well as to cope with complex electromagnetic interference environments and simplify the wiring system, the cable in this embodiment includes a first main wire 8, with multiple strands of first secondary wires 82 wound around the outside of the first main wire 8, multiple sets of second main wires 81 wound around the outside of the multiple sets of first secondary wires 82, and multiple strands of second secondary wires 83 wound around the outside of the second main wires 81. The diameter of the first main wire 8 is larger than the diameter of the second main wire 81, and the diameter of the second main wire 81 is larger than the diameter of the first secondary wires 82 and the second secondary wires 83. The diameters of the first secondary wires 82 and the second secondary wires 83 are the same. The multiple strands of second secondary wires 83 are covered with a protective layer, which consists of a wrapping layer 84, a shielding layer 85, and an outer sheath 86 from the inside out.

[0046] The cable, employing a multi-layered concentric loop structure of "main line-secondary line," integrates cores of different specifications in a nested manner, achieving the core advantages of high-density cabling and multi-functional integrated transmission. This not only significantly improves space utilization, enabling a single cable to simultaneously carry high current and multiple control signals, simplifying system cabling, but its unique structure also naturally creates multiple layers of electromagnetic shielding, effectively ensuring signal integrity. Furthermore, the interlocking design enhances the cable's mechanical stability and tensile strength.

[0047] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "an," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-core insulated cable stranding device for transmission lines, comprising a mounting platform (1), characterized in that: The mounting platform (1) is fixedly provided with a wire feeding reel (11) and a wire taking-up reel (12). Multiple sets of mounting discs (13) are fixedly spaced between the wire taking-up reel (12) and the wire feeding reel (11). Multiple sets of movable columns (131) are movably arranged on the mounting discs (13) corresponding to the number of strands of multiple sets of cables. The multiple sets of movable columns (131) are arranged in a uniform circumferential array with the center of the mounting disc (13) as the center. Multiple sets of cables pass through the multiple sets of movable columns (131). Two sets of safety mechanisms (2) are symmetrically arranged on the movable columns (131). The safety mechanisms (2) are used to perform emergency braking at the end of the cable when it breaks to prevent the cable end from swinging. Multiple sets of limiting structures (3) are arranged on the mounting discs (13) and the movable columns (131) corresponding to the number of movable groups to limit the displacement of the movable columns (131) during emergency braking. The safety mechanism (2) includes a movable block (21), a sliding block (22), a telescopic column (23), a first elastic element (24), and an adjustment component (25). Multiple sets of the movable block (21), the sliding block (22), the telescopic column (23), and the first elastic element (24) are arranged in a uniform circumferential array centered on the cable. The movable block (21) includes an integrally formed first movable segment, a second movable segment, and a third movable segment. The second movable segment is located between the first and third movable segments. The thickness of the first movable segment is greater than that of the third movable segment. The side of the second movable segment away from the cable is inclined. The end face of the first movable segment is located near the movable column (131). A movable groove is formed on the movable column (131) corresponding to the movable block (21). The movable groove includes a first groove segment, a second groove segment, and an adjustment component (25). The third groove segment has the same depth as the first movable segment and the same depth as the third movable segment. The second groove segment is located between the first groove segment and the second groove segment and is inclined to the second movable segment. When the movable block (21) moves into the movable groove, the second movable segment abuts against the inclined groove wall of the second groove segment. A sliding groove is provided in the movable column (131). The sliding block (22) is slidably disposed in the sliding groove. One end of the telescopic column (23) is fixedly connected to the third movable segment and the other end is fixedly connected to the sliding block (22). The first elastic element (24) is sleeved on the telescopic column (23). The adjustment component (25) is disposed on the third movable segment and the sliding block (22) for pressurizing and separating the movable block (21) from the cable. The limiting structure (3) includes a first limiting block (31), a second limiting block (32), and a second elastic element (33). A first limiting groove is provided in the mounting plate (13). The first limiting block (31) and the second limiting block (32) are slidably disposed in the limiting groove. The second elastic element (33) is disposed between the first limiting block (31) and the second limiting block (32), and its two ends are fixedly connected to the first limiting block (31) and the second limiting block (32) respectively. A second limiting groove is provided on the movable column (131). The ends of the first limiting block (31) and the second limiting block (32) near the movable column (131) are slidably disposed in the second limiting groove. The lengths of the first limiting groove and the second limiting groove are the same. Under normal conditions, the first limiting block (31) and the second limiting block (32) are located at the two ends of the second limiting groove respectively.

2. The multi-core insulated cable stranding device for transmission lines according to claim 1, characterized in that: The adjustment component (25) includes a first electromagnet (251) and a second electromagnet (252). The first electromagnet (251) is embedded in the sliding block (22) on the side near the movable block (21), and the second electromagnet (252) is embedded in the third movable segment on the side near the sliding block (22).

3. A multi-core insulated cable stranding device for transmission lines according to claim 2, characterized in that: The end of the movable column (131) is provided with multiple sets of mounting grooves (4). The multiple sets of mounting grooves (4) are circumferentially spaced and evenly opened along the axis of the movable column (131). A detection block (41) is provided in the mounting groove (4). A third elastic element (42) is provided between the detection block (41) and the inner wall of the mounting groove (4). When a wire breaks or is missing inside the cable, it drives the detection block (41) to move radially. A detection component (5) is provided on the detection block (41) for detecting the radial movement of the detection block (41).

4. A multi-core insulated cable stranding device for transmission lines according to claim 3, characterized in that: The detection component (5) includes a laser emitter (51) and a laser receiver (52). Multiple sets of laser emitters (51) are provided corresponding to the detection block (41). Multiple sets of laser emitters (51) are fixed and embedded on the side of the multiple sets of detection blocks (41) away from the movable column (131). Multiple sets of laser receivers (52) are provided. Multiple sets of laser receivers (52) are evenly spaced around the cable on the side of the adjacent mounting plate (13) and close to each other. The laser receivers (52) are electrically connected to the first electromagnet (251) and the second electromagnet (252).

5. A multi-core insulated cable stranding device for transmission lines according to claim 1, characterized in that: A baffle (6) is provided between adjacent movable blocks (21) located on the same movable column (131) and on the same horizontal line.

6. A multi-core insulated cable stranding device for transmission lines according to claim 3, characterized in that: Both the movable block (21) and the detection block (41) have an elastic friction layer (7) on the side near the cable.

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