Rotary traction device for low-voltage small-cable stranding single-strand machine

Abstract

The application relates to a rotary traction device for a low-voltage small-cable stranding single-stranding machine, and belongs to the technical field of cable production equipment. The rotary traction device comprises a rack, a main rotary body rotatably arranged on the rack, a main rotary driving motor arranged at one end of the rack, and a main rotary transmission assembly for driving the main rotary body to rotate by the main rotary driving motor. A cable core traction mechanism and a cable core pressing mechanism are arranged on the main rotary body. A traction motor is arranged on the main rotary transmission assembly. A traction transmission assembly is arranged between the traction motor and the cable core traction mechanism. The traction motor drives the cable core traction mechanism to operate through the traction transmission assembly. The main rotary driving motor and the traction driving motor are fixed on the non-rotating rack, so that the problems of severe vibration, bearing overload, lubrication difficulty and dynamic balance caused by high-speed rotation of the motor with the main rotary body are completely eliminated. The main rotary body operation stability is greatly improved, the service life of bearings and other key components is prolonged, and the failure rate is fundamentally reduced.

Description

Technical Field

[0001] This application relates to the technical field of cable production equipment, and in particular to a rotary traction device for a low-voltage small-diameter cable twisting machine. Background Technology

[0002] In the cable manufacturing industry, single-strand cabling machines and rotary traction devices are core combined equipment for manufacturing high-quality data cables and communication cables. Among them, the rotary traction device, as a key component of the single-strand cabling machine, requires its traction and take-up devices to rotate around the axis of the entire machine to complete the traction and take-up of the cable cores during rotation, thereby achieving precise control over the stranding pitch of the insulated cores.

[0003] Currently, traditional rotary tracked traction machines mainly suffer from the following technical defects: 1. Complex transmission system, high failure rate and high maintenance difficulty: Its drive system typically uses a mechanical transmission chain composed of numerous gears and transmission components, resulting in a complex structural design. This type of transmission not only lacks reliable self-locking functionality but also becomes a common point of failure in the equipment. Once a failure occurs, due to limited structural space, the troubleshooting and repair process is extremely difficult, seriously affecting the continuity of production.

[0004] 2. Mounting motors on the rotating body leads to severe dynamic imbalance and vibration problems: To provide traction power, the traditional solution involves directly mounting two drive motors on the main rotating body. However, the motors themselves have manufacturing and assembly errors, and adding them to the rotating body inevitably leads to uneven mass distribution in the rotating system. When the system rotates at high speed, the mass eccentricity generates huge dynamic imbalance centrifugal forces, thereby causing severe vibration of the entire machine. This not only reduces operational accuracy but may also damage the equipment structure and connecting components.

[0005] 3. Significantly increased bearing load and shortened service life: The motor is mounted on a rotating body, meaning the main bearing supporting the rotating body must not only bear the designed load but also the cyclic centrifugal force and gyroscopic torque generated by dynamic imbalance. More importantly, the motor revolves with the rotating body, requiring its bearings to simultaneously withstand the additional centrifugal force generated by the rotor's rotation, the motor housing's rotation, dynamic imbalance forces, and various combined loads. This easily causes the bearings to exceed their design load limits, leading to early fatigue, abnormal wear, or even seizure failure.

[0006] 4. Leading to lubrication failure: When a bearing rotates at high speed with the rotating body, the original lubricating oil or grease inside is easily thrown out of the effective working area due to the strong centrifugal force, making it impossible to form an oil film or return properly. This leaves the bearing in a state of poor lubrication or even dry friction for a long time, accelerating the failure process.

[0007] 5. Maintenance difficulties: Because the motor is integrated into the rotating body, technicians cannot perform safe and accurate electrical measurements while the equipment is running, posing a significant obstacle to fault diagnosis. Furthermore, after the equipment stops, the motor may be stationary at any angle. Disassembling the motor requires custom-made specialized tooling for positioning and alignment marking, a cumbersome process that results in high maintenance costs and significantly increased downtime.

[0008] In view of the shortcomings of the aforementioned related technologies, how to simplify the transmission system, eliminate dynamic imbalance vibration, reduce bearing load, ensure reliable lubrication, improve the convenience of equipment maintenance, and at the same time avoid cable damage and ensure production quality has become an important technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] To address the above issues, this application provides a rotary traction device for low-voltage small-diameter single-twisted cable machines.

[0010] This application provides a rotary traction device for a low-voltage small-diameter cable twisting machine, which adopts the following technical solution: A rotary traction device for a low-voltage small single-strand cable machine includes a frame, on which a main rotating body is rotatably mounted. A main rotary drive motor is mounted at one end of the frame, and a main rotary transmission assembly is provided between the main rotary drive motor and the main rotating body. The main rotary drive motor drives the main rotating body to rotate through the main rotary transmission assembly. A cable core traction mechanism and a cable core pressing mechanism are provided on the main rotating body. A traction motor (5) is mounted on the frame and located on one side of the main rotary transmission assembly. A traction transmission assembly is provided between the traction motor and the cable core traction mechanism. The traction motor drives the cable core traction mechanism to operate through the traction transmission assembly. The cable core traction mechanism is used to traction the cable core to move, and the cable core pressing mechanism is used to press against the cable core traction mechanism to press the cable core and achieve traction and transportation.

[0011] By adopting the above technical solution, the traction motor is arranged on the main rotary transmission component, rather than mounted on the main rotating body in a backpack-like manner, which fundamentally eliminates mass eccentricity and avoids severe vibration caused by high-speed rotation; the overall structure is simplified, there is no complex gear transmission, and the operation is stable, with low noise and low failure rate; the cable core traction mechanism and the cable core clamping mechanism work together to achieve stable and non-destructive traction of the cable core and ensure the surface quality of the cable.

[0012] Preferably, the main rotary transmission assembly includes a main rotary driving pulley, a main rotary driven pulley, and a main rotary synchronous belt; the main rotary driving pulley is fixed on the output shaft of the main rotary drive motor; the two ends of the main rotary body are provided with a hollow central main shaft, the main rotary driven pulley is fixed to one end of the central main shaft, and the main rotary synchronous belt is sleeved between the main rotary driving pulley and the main rotary driven pulley.

[0013] By adopting the above technical solution, the main rotating body is driven by synchronous belt drive, which ensures smooth transmission, no slippage, and precise speed, thus guaranteeing stable cable pitch; the hollow structure of the central main shaft facilitates cable routing and optimizes the overall layout of the machine.

[0014] Preferably, a traction shaft is coaxially sleeved and fixed outside the central main shaft, and the traction shaft rotates synchronously with the central main shaft; a traction drive pulley is fixed on the output shaft of the traction motor, and a traction driven pulley is fixed on the traction shaft; a traction master synchronous belt is sleeved between the traction drive pulley and the traction driven pulley; the cable core traction mechanism includes an upper traction module and a lower traction module arranged symmetrically; the traction transmission assembly includes an upper traction transmission group and a lower traction transmission group; the upper traction transmission group includes an upper traction main belt. The upper traction main pulley, the upper traction driven pulley, and the upper traction synchronous belt are arranged together. The upper traction main pulley is fixed on the traction shaft, the upper traction driven pulley is fixed on the upper traction module, and the upper traction synchronous belt is sleeved between the upper traction main pulley and the upper traction driven pulley. The lower traction transmission group includes a lower traction main pulley, a lower traction driven pulley, and a lower traction synchronous belt. The lower traction main pulley is fixed on the traction shaft, the lower traction driven pulley is fixed on the lower traction module, and the lower traction synchronous belt is sleeved between the lower traction main pulley and the lower traction driven pulley.

[0015] By adopting the above technical solution, a traction motor and a traction shaft are used to drive the upper and lower traction modules simultaneously through a synchronous belt system, ensuring that the speeds of the upper and lower tracks are completely synchronized, thus eliminating the problems of thread tearing, abrasion, and wrapping layer damage caused by speed difference from the root. The coaxial traction shaft has a compact structure, high transmission efficiency, and stable operation.

[0016] Preferably, the upper traction transmission group is connected to the upper traction module via an upper worm gear transmission assembly, and the lower traction transmission group is connected to the lower traction module via a lower worm gear transmission assembly; the upper traction module includes an upper traction drive roller, an upper traction driven roller, and an upper traction track, the upper traction drive roller is coaxially and fixedly connected to the worm gear of the upper worm gear transmission assembly, the upper traction driven roller is rotatably mounted on the main rotating body, and the upper traction track is sleeved between the upper traction drive roller and the upper traction driven roller.

[0017] By adopting the above technical solutions, the worm gear transmission has a self-locking function, which can prevent the track from reversing when the machine stops, ensuring accurate traction positioning; the track type has a large contact area and uniform pressure, which will not damage the surface of the cable core, and is suitable for traction of cables of various diameters.

[0018] Preferably, the cable core clamping mechanism includes an upper clamping module and a lower clamping module arranged symmetrically in the upper and lower directions; the upper clamping module is located inside the upper traction track and includes a plurality of upper clamping units evenly distributed along the length direction of the main rotating body; the lower clamping module includes lower clamping units corresponding to the upper clamping units.

[0019] By adopting the above technical solution, multiple sets of clamping units are evenly distributed along the length direction, making the track and cable core fit more tightly and the force more even, avoiding slippage caused by excessive local pressure or insufficient clamping.

[0020] Preferably, the upper clamping unit includes a mounting plate horizontally fixed on the main rotating body, an upper clamping cylinder vertically fixedly connected to the mounting plate, the piston rod of the upper clamping cylinder facing downward and fixedly connected to a mounting frame, a plurality of clamping roller shafts evenly arranged along its length direction inside the mounting frame, the axis of the clamping roller shafts being perpendicular to the axis of the upper clamping cylinder, and the clamping roller shafts pressing downward against the inner side of the upper traction track.

[0021] By adopting the above technical solution, the pressure roller shaft is driven by a cylinder, which is adjustable, responds quickly, and runs smoothly. The pressure roller shaft presses from the inside of the track outward, so that the outer surface of the track is evenly attached to the cable core, which is stable and does not damage the track.

[0022] Preferably, both the upper and lower clamping units are equipped with guide units. Each guide unit includes a base plate that is vertically and fixedly connected to the main rotating body. The tail end of the upper clamping cylinder is fixed to the base plate. A first guide roller group and a second guide roller group are provided on the side of the base plate away from the upper clamping cylinder. The first guide roller group includes two vertically arranged first guide rollers, and the second guide roller group includes two horizontally arranged second guide rollers. The upper traction track passes through the first guide rollers and the second guide rollers in sequence and moves.

[0023] By adopting the above technical solution, the double set of guide rollers limits and guides the track, preventing it from running off course, derailing, or deviating during operation, ensuring the stability of the track's running trajectory, and further protecting the cable core from being scratched.

[0024] Preferably, the main rotating body has vertically formed adjustment slots corresponding to each upper and lower pressing unit. A rotating rod is provided between the two adjustment slots corresponding to the same pressing unit. The axis of the rotating rod is perpendicular to the axis of the upper pressing cylinder, and the rotating rod is located on the side of the main rotating body away from the cable core pressing mechanism. A connecting plate is rotatably connected to the rotating rod. Adjusting plates are rotatably connected to both ends of the connecting plate. An adjusting rod is rotatably connected to the end of the adjusting plate away from the connecting plate. The adjusting rod is slidably disposed in the corresponding adjustment slot.

[0025] By adopting the above technical solution, a four-bar linkage adjustment structure is formed by the rotating rod, connecting plate, adjusting plate and adjusting rod. When it is necessary to adjust the gap, rotating the rotating rod can drive the upper and lower pressing units to move synchronously towards or away from each other through the four-bar linkage mechanism, ensuring that the pressing center is always located on the equipment axis, adapting to cable cores of different diameters, and making the adjustment convenient and highly consistent.

[0026] Preferably, an upper track tensioning mechanism and a lower track tensioning mechanism are symmetrically arranged on the main rotating body; the upper track tensioning mechanism includes an upper tensioning cylinder horizontally fixed on the main rotating body, an upper support plate is rotatably connected to the piston rod of the upper tensioning cylinder, a fixed shaft is rotatably connected to the end of the upper support plate away from the piston rod, and the fixed shaft is fixed to the main rotating body through a bearing seat; an upper arc-shaped groove is opened on the main rotating body, and the mounting shaft of the upper traction driven roller passes through the upper arc-shaped groove and is rotatably connected to the upper support plate, and the mounting shaft is slidably disposed in the upper arc-shaped groove.

[0027] By adopting the above technical solution, when the piston rod of the upper tensioning cylinder extends or retracts, it will drive the upper support plate to rotate around the fixed shaft, thereby causing the mounting shaft of the upper traction driven roller to slide along the upper arc groove, changing the distance between it and the upper traction active roller, and realizing the tensioning or loosening of the upper traction track; the tension force is stable and adjustable, avoiding track slack and slippage, and ensuring constant traction speed and tension.

[0028] Preferably, the frame is provided with support frames at both ends, and the two ends of the central spindle are rotatably mounted on the support frames via bearings.

[0029] By adopting the above technical solution, the support frames at both ends cooperate with the bearings to support the central spindle, which provides stable support, smooth rotation, and low radial load, thereby reducing rotational resistance and wear and extending the service life of the whole machine.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. By fixing both the main rotary drive motor and the traction drive motor to a non-rotating frame, the severe vibration, bearing overload, lubrication problems, and dynamic balance issues caused by the high-speed rotation of the motors with the main rotating body are completely eliminated. This significantly improves the operational stability of the main rotating body, extends the service life of key components such as bearings, and fundamentally reduces the failure rate. 2. Through a traction shaft that rotates synchronously with the main rotating body, and using upper and lower traction synchronous belts, the power of a single traction motor is equally and synchronously transmitted to the upper and lower traction modules. This mechanical synchronization method of single-shaft drive and synchronous distribution ensures a high degree of consistency in the linear speed of the upper and lower traction tracks from the source, effectively avoiding the wire twisting phenomenon caused by speed difference and protecting the surface quality of the cable core; 3. By using several independently configured upper and lower clamping cylinders for clamping, the clamping force of the cable core can be dynamically compensated and adaptively enhanced under high-speed rotation conditions. Specifically, through an external control system (such as a PLC), the real-time speed signal of the main rotating body and the air pressure control signal of the clamping cylinders are linked in a closed loop. It can be set so that the higher the rotation speed, the greater the clamping force output by the system. This active control strategy can effectively counteract the outward expansion trend of the traction track and clamping mechanism components due to centrifugal force when the main rotating body rotates at high speed, thereby compensating for the possible attenuation of clamping force. It solves the problem of slippage caused by insufficient clamping force in traditional rotary traction equipment when speeding up, enabling this device to operate stably at higher linear speeds, significantly improving the operating efficiency and capacity limit of the entire cable cabling production line.

[0031] 4. The vertically arranged first guide roller and the horizontally arranged second guide roller can guide and limit the traction track that does not participate in the traction work, ensuring the stability of the traction track's running trajectory and further protecting the cable core from being scratched. Attached Figure Description

[0032] Figure 1 This is a structural schematic diagram illustrating the rotary traction device in the embodiments of this application.

[0033] Figure 2 yes Figure 1 The enlarged view in section A shows the connection relationship between the upper and lower traction drive groups.

[0034] Figure 3 This is a structural schematic diagram illustrating the cable core traction mechanism in the embodiments of this application.

[0035] Figure 4 yes Figure 3 The enlarged view of section B shows the structural schematic of the upper clamping unit.

[0036] Figure 5 yes Figure 1 The enlarged view of section C shows the schematic diagram of the connection structure of the adjusting rod, connecting plate, and adjusting plate.

[0037] Figure 6 yes Figure 1 The enlarged view of section D shows the structural schematic diagram of the upper track tensioning mechanism.

[0038] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Support frame; 2. Main rotating body; 21. Central spindle; 22. Adjusting groove; 221. Adjusting rod; 23. Rotating rod; 24. Connecting plate; 25. Adjusting plate; 26. Traction shaft; 3. Main rotation drive motor; 4. Main rotation transmission assembly; 41. Main rotation drive pulley; 42. Main rotation driven pulley; 43. Main rotation synchronous belt; 5. Traction motor; 51. Traction drive pulley; 52. Traction driven pulley; 53. Main traction synchronous belt; 6. Cable core traction mechanism; 61. Upper traction module; 611. Upper traction drive roller; 612. Upper traction driven roller; 613. Upper traction track; 62. Lower traction module; 7. Traction transmission assembly; 71. Upper traction transmission... Group; 711, Upper traction main pulley; 712, Upper traction driven pulley; 713, Upper traction synchronous belt; 714, Upper worm gear transmission assembly; 72, Lower traction transmission group; 721, Lower traction main pulley; 722, Lower traction driven pulley; 723, Lower traction synchronous belt; 724, Lower worm gear transmission assembly; 8, Cable core clamping mechanism; 81, Upper clamping unit; 811, Upper clamping cylinder; 812, Mounting frame; 813, Clamping roller shaft; 82, Lower clamping unit; 9, Guide unit; 91, Base plate; 92, First guide roller group; 93, Second guide roller group; 10, Upper track tensioning mechanism; 101, Upper tensioning cylinder; 102, Upper support plate; 103, Upper arc groove; 104, Fixed shaft. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0040] This application discloses a rotary traction device for a low-voltage small-diameter single-twisted cable machine, referring to... Figure 1 The system includes a frame 1 and a main rotating body 2. Support frames 11 are provided at both ends of the frame 1, and a central spindle 21 is coaxially provided at both ends of the main rotating body 2. The central spindle 21 is rotatably mounted on the corresponding support frame 11 through bearings. The central spindle 21 is hollow inside to allow the cable core to pass through.

[0041] Reference Figure 2 A main rotary drive motor 3 is fixed at one end of the frame 1. A main rotary transmission assembly 4 is provided between the main rotary drive motor 3 and the main rotary body 2, including a main rotary drive pulley 41, a main rotary driven pulley 42, and a main rotary synchronous belt 43. The main rotary drive pulley 41 is fixedly mounted on the output shaft of the main rotary drive motor 3, and the main rotary driven pulley 42 is fixedly mounted on the central main shaft 21 near the end of the main rotary drive motor 3. The main rotary drive pulley 41 and the main rotary driven pulley 42 are connected by the main rotary synchronous belt 43. When the main rotary drive motor 3 is started, power is transmitted through the main rotary synchronous belt 43, driving the entire main rotary body 2 to rotate uniformly around its axis.

[0042] Reference Figure 1 , Figure 2 A traction motor 5, fixed to the frame 1, is installed at the main rotary drive motor 3. A traction drive pulley 51 is mounted on the output shaft of the traction motor 5. A traction shaft 26 is coaxially fixed outside the central main shaft 21, and the traction shaft 26 rotates synchronously with the central main shaft 21. A traction driven pulley 52 is fixed on the traction shaft 26. The traction drive pulley 51 and the traction driven pulley 52 are connected by a traction master timing belt 53. In this way, the power of the traction motor 5 is transmitted to the rotating traction shaft 26 through the traction master timing belt 53.

[0043] The traction shaft 26 serves as the power distribution shaft and is equipped with a traction transmission assembly 7, which includes an upper traction transmission group 71 and a lower traction transmission group 72. The main rotating body 2 is equipped with a cable core traction mechanism 6, which includes an upper traction module 61 and a lower traction module 62 arranged symmetrically. The upper traction transmission group 71 is connected to the upper traction module 61 via an upper worm gear transmission assembly 714; the lower traction transmission group 72 is connected to the lower traction module 62 via a lower worm gear transmission assembly 724. The upper and lower worm gear transmission assemblies 724 are used for reversing direction.

[0044] Specifically, refer to Figure 2 The upper traction transmission group 71 includes an upper traction main pulley 711, an upper traction driven pulley 712, and an upper traction synchronous belt 713. The upper traction main pulley 711 is fixed on the traction shaft 26, and the upper traction driven pulley 712 is mounted on the main rotating body 1 and connected to the worm shaft of the upper worm gear transmission assembly 714 via a coupling. The upper traction synchronous belt 713 is sleeved between the upper traction main pulley 711 and the upper traction driven pulley 712. The lower traction transmission group 72 includes a lower traction main pulley 721, a lower traction driven pulley 722, and a lower traction synchronous belt 723. The lower traction main pulley 721 is fixed on the traction shaft 26, and the lower traction driven pulley 722 is mounted on the main rotating body 1 and connected to the lower worm shaft of the lower worm gear transmission assembly 724 via a coupling. The lower traction synchronous belt 723 is sleeved between the lower traction main pulley 721 and the lower traction driven pulley 722.

[0045] Reference Figure 3The upper traction module 61 includes an upper traction drive roller 611, an upper traction driven roller 612, and an upper traction track 613. The upper traction drive roller 611 is coaxially and fixedly connected to the worm wheel of the upper worm gear transmission assembly 714. The upper traction driven roller 612 is rotatably mounted on the main rotating body 2, and the upper traction track 613 is sleeved between the upper traction drive roller 611 and the upper traction driven roller 612. Since the lower traction module 62 is completely symmetrical to the upper traction module 61 and operates on the same principle, it will not be described in detail here for the sake of simplicity. With this design, a fixed traction motor 5 can drive the rotating upper traction module 61 and lower traction module 62 to achieve precise mechanical synchronous traction.

[0046] Reference Figure 3 , Figure 4 The main rotating body 2 is equipped with a cable core clamping mechanism 8, which includes an upper clamping module and a lower clamping module arranged symmetrically. The upper clamping module is located inside the upper traction track 613 and includes multiple upper clamping units 81 arranged along the length of the main rotating body 2. Each upper clamping unit 81 includes a mounting plate horizontally fixed to the main rotating body 2. An upper clamping cylinder 811 is vertically mounted on the mounting plate, with its piston rod extending downward and connected to a mounting frame 812. Several freely rotatable clamping roller shafts 813 are mounted side by side inside the mounting frame 812, and the axis of the clamping roller shafts 813 is perpendicular to the axis of the upper clamping cylinder 811. During operation, the upper clamping cylinder 811 pushes the clamping roller shafts 813 downward, pressing the inner side of the upper traction track 613 against the cable core. The lower clamping unit 82 is symmetrical to the upper clamping unit 81. Its clamping cylinders lift upwards to provide support from below, which, together with the pressure of the upper clamping roller 813, forms a clamping force. By adjusting the pressure of each upper clamping cylinder 811, the clamping force on the cable core can be controlled to prevent slippage or damage.

[0047] Reference Figure 4 Guide units 9 are provided on both the upper and lower sides of the main rotating body 2, each including a base plate 91 vertically fixed to the main rotating body 2. The tail end of the upper clamping cylinder 811 is also fixed to the base plate 91. Two sets of guide rollers are installed on the base plate 91. The first guide roller set 92 includes two vertically arranged first guide rollers, which constrain the width direction of the upper traction track 613 from both sides. The second guide roller set 93 includes two horizontally arranged second guide rollers, which constrain the thickness direction of the track from both the upper and lower sides. This guide unit 9 can ensure that the upper traction track 613 runs smoothly and in accurate position, and prevent the track from twisting or deviating.

[0048] Reference Figure 5To quickly adjust the gap between the upper clamping unit 81 and the lower clamping unit 82 to accommodate different cable core diameters and ensure center alignment during adjustment, a linkage adjustment mechanism is provided. Vertical adjustment slots 22 are provided on the main rotating body 2, corresponding to each pair of upper clamping units 81 and lower clamping units 82. A rotating rod 23 is horizontally mounted on the back of the main rotating body 2 via bearings. A connecting plate 24 is hinged to the rotating rod 23, and an adjusting plate 25 is hinged to each end of the connecting plate 24. An adjusting rod 221 is hinged to the other end of each adjusting plate 25. The two adjusting rods 221 slide through the corresponding adjusting slots 22 and are connected to the corresponding mounting frames 812. When it is necessary to increase the gap to allow a thicker cable core to pass through, the rotating rod 23 is rotated to drive the connecting plate 24 to swing. This causes the upper clamping unit 81 to move upward and the lower clamping unit 82 to move downward simultaneously through the adjusting plate 25 and the adjusting rod 221, with equal movement distances. This allows the clamping center line to remain unchanged while increasing the gap.

[0049] Reference Figure 6 Taking the track tensioning mechanism 10 as an example, an upper tensioning cylinder 101 is horizontally mounted on the main rotating body 2. The end of its piston rod is hinged to the lower end of an upper support plate 102. The upper end of the upper support plate 102 is hinged to a fixed shaft 104 fixed to the back of the main rotating body 2 via a bearing seat. The mounting shaft of the upper traction driven roller 612 passes through the upper arc-shaped groove 103 and is hinged to the lower part of the upper support plate 102. When the piston rod of the upper tensioning cylinder 101 extends, it pushes the upper support plate 102 to rotate around the fixed shaft 104, thereby causing the mounting shaft to slide outward along the upper arc-shaped groove 103, thus tensioning the upper traction track 613. The lower track tensioning mechanism is symmetrically structured and used to tension the lower traction track. Pneumatic tensioning can achieve automatic compensation, maintaining a constant track tension.

[0050] The implementation principle of a rotary traction device for a low-voltage small-diameter cable twisting machine according to an embodiment of this application is as follows: Before starting the equipment, the initial gap between the upper and lower clamping units 82 is adjusted according to the cable core diameter via the linkage adjustment mechanism, and the cylinder clamping force is set. The traction motor 5 is started, and power is transmitted synchronously to the upper traction module 61 and lower traction module 62 via the traction main synchronous belt 53 and traction shaft 26, driving the upper and lower traction tracks to run in the same direction and at the same speed. The main rotary drive motor 3 is started, driving the entire main rotating body 2 to begin rotating. The cable core is inserted through the hollow of the central main shaft 21, passing between the upper and lower traction tracks. The clamping cylinder is operated, causing the upper clamping unit 81 and lower clamping unit 82 to press the traction tracks against the cable core, forming sufficient clamping friction. Under the traction of the traction tracks, the cable core is pulled out at a uniform speed; simultaneously, due to the rotation of the main rotating body 2, the traction tracks revolve around the cable core while pulling it, thus superimposing rotational twisting motion on the linear traction motion, realizing the single-twisted cable forming process. Throughout the process, the motor ran smoothly, the traction was synchronized, and the clamping force was stable, thus ensuring high-quality cable pitch and protection of the cable core surface.

[0051] The above are all preferred 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 rotary traction device for a low-voltage small-diameter single-twisted cable machine, comprising a frame (1), characterized in that: A main rotating body (2) is rotatably mounted on the frame (1). A main rotating drive motor (3) is mounted at one end of the frame (1). A main rotating transmission assembly (4) is provided between the main rotating drive motor (3) and the main rotating body (2). The main rotating drive motor (3) drives the main rotating body (2) to rotate through the main rotating transmission assembly (4). The main rotating body (2) is provided with a cable core traction mechanism (6) and a cable core pressing mechanism (8). A traction motor (5) is provided on the frame (1) on one side of the main rotating transmission assembly (4). A traction transmission assembly (7) is provided between the traction motor (5) and the cable core traction mechanism (6). The traction motor (5) drives the cable core traction mechanism (6) to operate through the traction transmission assembly (7). The cable core traction mechanism (6) is used to traction the cable core to move, and the cable core pressing mechanism (8) is used to press against the cable core traction mechanism (6) to press the cable core and realize traction and transportation.

2. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 1, characterized in that: The main rotary transmission assembly (4) includes a main rotary driving pulley (41), a main rotary driven pulley (42), and a main rotary synchronous belt (43); the main rotary driving pulley (41) is fixed on the output shaft of the main rotary drive motor (3); The main rotating body (2) has a hollow central main shaft (21) at both ends. The main rotating driven pulley (42) is fixed at one end of the central main shaft (21). The main rotating synchronous belt (43) is sleeved between the main rotating driving pulley (41) and the main rotating driven pulley (42).

3. The rotary traction device for a low-voltage small-diameter single-twisted cable machine according to claim 2, characterized in that: A traction shaft (26) is coaxially sleeved and fixed outside the central main shaft (21), and the traction shaft (26) rotates synchronously with the central main shaft (21). A traction drive pulley (51) is fixed on the output shaft of the traction motor (5), and a traction driven pulley (52) is fixed on the traction shaft (26). A traction master synchronous belt (53) is sleeved between the traction drive pulley (51) and the traction driven pulley (52). The cable core traction mechanism (6) includes an upper traction module (61) and a lower traction module (62) arranged symmetrically in the upper and lower positions; The traction drive assembly (7) includes an upper traction drive group (71) and a lower traction drive group (72); The upper traction transmission group (71) includes an upper traction main pulley (711), an upper traction driven pulley (712), and an upper traction synchronous belt (713). The upper traction main pulley (711) is fixed on the traction shaft (26), the upper traction driven pulley (712) is fixed on the upper traction module (61), and the upper traction synchronous belt (713) is sleeved between the upper traction main pulley (711) and the upper traction driven pulley (712). The lower traction transmission group (72) includes a lower traction main pulley (721), a lower traction driven pulley (722), and a lower traction synchronous belt (723). The lower traction main pulley (721) is fixed on the traction shaft (26), the lower traction driven pulley (722) is fixed on the lower traction module (62), and the lower traction synchronous belt (723) is sleeved between the lower traction main pulley (721) and the lower traction driven pulley (722).

4. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 3, characterized in that: The upper traction transmission group (71) is connected to the upper traction module (61) through the upper worm gear transmission assembly (714), and the lower traction transmission group (72) is connected to the lower traction module (62) through the lower worm gear transmission assembly (724). The upper traction module (61) includes an upper traction drive roller (611), an upper traction driven roller (612), and an upper traction track (613). The upper traction drive roller (611) is coaxially and fixedly connected to the worm wheel of the upper worm gear transmission assembly (714). The upper traction driven roller (612) is rotatably mounted on the main rotating body (2). The upper traction track (613) is sleeved between the upper traction drive roller (611) and the upper traction driven roller (612).

5. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 4, characterized in that: The cable core clamping mechanism (8) includes an upper clamping module and a lower clamping module arranged symmetrically in the upper and lower parts; The upper clamping module is located inside the upper traction track (613) and includes several upper clamping units (81) evenly distributed along the length of the main rotating body (2); The lower clamping module includes a lower clamping unit (82) corresponding to the upper clamping unit (81).

6. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 5, characterized in that: The upper pressing unit (81) includes a mounting plate horizontally fixed on the main rotating body (2). An upper pressing cylinder (811) is vertically fixedly connected to the mounting plate. The piston rod of the upper pressing cylinder (811) faces downward and is fixedly connected to a mounting frame (812). A plurality of pressing roller shafts (813) are evenly arranged in the mounting frame (812) along its length direction. The axis of the pressing roller shaft (813) is perpendicular to the axis of the upper pressing cylinder (811). The pressing roller shaft (813) presses downward against the inner side of the upper traction track (613).

7. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 6, characterized in that: Guide units (9) are provided at both the upper pressing unit (81) and the lower pressing unit (82). The guide unit (9) includes a base plate (91) that is vertically fixedly connected to the main rotating body (2). The tail end of the cylinder of the upper pressing cylinder (811) is fixed on the base plate (91). A first guide roller group (92) and a second guide roller group (93) are provided on the side of the base plate (91) away from the upper pressing cylinder (811). The first guide roller group (92) includes two vertically arranged first guide rollers, and the second guide roller group (93) includes two horizontally arranged second guide rollers. The upper traction track (613) moves through the first guide rollers and the second guide rollers in sequence.

8. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 7, characterized in that: The main rotating body (2) is vertically provided with adjustment grooves (22) corresponding to each upper pressing unit (81) and lower pressing unit (82). A rotating rod (23) is provided between the two adjustment grooves (22) corresponding to the same pressing unit. The axis of the rotating rod (23) is perpendicular to the axis of the upper pressing cylinder (811), and the rotating rod (23) is located on the side of the main rotating body (2) away from the cable core pressing mechanism (8). A connecting plate (24) is rotatably connected to the rotating rod (23). An adjusting plate (25) is rotatably connected to both ends of the connecting plate (24). An adjusting rod (221) is rotatably connected to the end of the adjusting plate (25) away from the connecting plate (24). The adjusting rod (221) is slidably disposed in the corresponding adjusting groove (22).

9. The rotary traction device for a low-voltage small-diameter cable twisting machine according to claim 4, characterized in that: The main rotating body (2) is symmetrically provided with an upper track tensioning mechanism (10) and a lower track tensioning mechanism; The upper track tensioning mechanism (10) includes an upper tensioning cylinder (101) horizontally fixed on the main rotating body (2). An upper support plate (102) is rotatably connected to the piston rod of the upper tensioning cylinder (101). A fixed shaft (104) is rotatably connected to one end of the upper support plate (102) away from the piston rod. The fixed shaft (104) is fixed on the main rotating body (2) through a bearing seat. The main rotating body (2) has an upper arc-shaped groove (103). The mounting shaft of the upper traction driven roller (612) passes through the upper arc-shaped groove (103) and is rotatably connected to the upper support plate (102). The mounting shaft is slidably disposed in the upper arc-shaped groove (103).

10. The rotary traction device for a low-voltage small-diameter single-twisted cable machine according to claim 2, characterized in that: The frame (1) has support frames (11) at both ends, and the two ends of the central spindle (21) are rotatably mounted on the support frames (11) through bearings.

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