New energy storage system cable production stranding equipment

Abstract

This invention discloses a stranding device for producing cables for new energy storage systems, belonging to the field of cable stranding technology. It includes a support assembly, a drive structure, a stranding structure connected to the drive mechanism for driving the wire to rotate and strand, a traction structure for pulling the stranded cable, and a synchronous transmission device disposed between the drive mechanism and the traction structure. The synchronous transmission device is configured to synchronously transmit the power of the drive mechanism to the stranding structure and the traction structure, so that the traction speed of the traction structure and the rotation speed of the stranding structure maintain a predetermined, adjustable transmission ratio. By synchronously controlling the drive mechanism to drive the stranding structure and the traction structure synchronously, the rotation speed of the winch and the traction speed are relatively stable during the stranding process, avoiding asynchronous traction speed and winch rotation speed, which could cause pitch fluctuations. Simultaneously, the synchronous cleaning structure helps to clean the orthogonal friction contact radius, preventing any impact on transmission stability.

Description

Technical Field

[0001] This invention relates to a stranding equipment for producing cables for new energy storage systems, belonging to the field of cable stranding technology. Background Technology

[0002] The conductor materials for new energy storage cables: The mainstream choice is high-conductivity oxygen-free copper (OFC), while some high-end products use silver-plated copper to improve oxidation resistance and conductivity stability. The conductor structure is mostly a multi-strand stranded design, enhancing flexibility and fatigue resistance, adapting to frequent bending and vibration conditions. The cable stranding machine achieves uniform stranding of multiple conductors through the coordinated movement of the rotating cage and the traction system. Its core principle is: the high-speed rotation of the cage drives multiple single wires to move in a circular motion around the central axis, while the traction device pulls the stranded wires forward axially at a constant speed. The distance the conductor moves axially with each rotation is called the "pitch". By precisely controlling the ratio of rotational speed to traction speed, the pitch can be adjusted to achieve stranded cores with different structures. This process relies on three key systems: a rotating auger system, which uses an arc-shaped frame or cage structure to support the wire reel and ensure that the conductor maintains stable tension during rotation; a tension control system, which adjusts the tension of individual wires in real time through springs, magnetic powder brakes, or servo motors to prevent wire breakage or loosening; and a guiding and winding system, where guide wheels guide the conductor to enter precisely, and a smooth rod winding device achieves uniform winding, avoiding overlap or offset.

[0003] In the production process of cables for new energy storage systems, the stranding process is the core link that determines the uniformity of conductor structure, electrical stability, and mechanical reliability. Currently, mainstream stranding equipment generally adopts an architecture of independent drive + electronic synchronous control. That is, the stranding reel and the traction device are driven independently by servo motors, and the speed signal is collected in real time by the PLC control system. The speed ratio is dynamically matched through algorithm calculation to maintain a constant stranding pitch P=Ncage / Vtraction. However, the electronic synchronization method has the following problems: Response delay: The sensor sampling, signal transmission and control algorithm processing introduce millisecond-level delays. Under high-speed operation (300rpm) or frequent pitch switching conditions, it is easy to cause the traction speed and the cage speed to be out of sync, resulting in pitch fluctuations; Limited accuracy: Due to the limitations of motor encoder resolution, electromagnetic interference and control loop gain, the pitch control error is usually above ±2%, which is difficult to meet the stringent requirements of new energy cables for conductor resistance consistency and high-frequency signal transmission stability. Summary of the Invention

[0004] The purpose of this invention is to provide a stranding equipment for the production of cables for new energy storage systems, so as to solve the problems of unstable stranding pitch and limited accuracy caused by the traditional electronic synchronization method mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Compared to existing technologies, the present invention provides a stranding device for producing cables for new energy storage systems, comprising: a support assembly, characterized in that it further comprises: Drive structure; The stranded wire structure is connected to the drive mechanism and is used to drive the wire to rotate and twist. A traction structure used to pull stranded cables; A synchronous transmission device is disposed between the drive mechanism and the traction structure; wherein... The synchronous transmission device can synchronously transmit the power of the drive mechanism to the stranded wire structure and the traction structure, so that the traction speed of the traction structure and the rotation speed of the stranded wire structure maintain a predetermined, adjustable transmission ratio.

[0006] Optionally, the support assembly consists of a base plate and a support frame, with the support frame fixedly supported above the base plate.

[0007] Optionally, the synchronous transmission device includes: The support sleeve, as part of the rotating main shaft, is driven by the drive mechanism; A conical disc is fixedly fitted onto the support sleeve; A friction transmission mechanism engages with the conical disc and transmits power to the traction structure; wherein... The transmission ratio between the traction structure and the stranded wire structure can be infinitely adjusted by changing the contact radius between the friction transmission mechanism and the conical disc.

[0008] Optionally, the friction transmission mechanism includes: A conical disc is used to receive rotational power from the drive mechanism; Two conical blocks are arranged symmetrically along the axial direction of the support sleeve and are in rolling contact with the conical surface of the conical disk; An adjustment component is used to drive the two conical blocks to move synchronously along the axial direction of the support sleeve to change their contact radius with the conical disk; At least one conical block is in frictional contact with the conical surface of the conical disk; The output speed can be steplessly adjusted by changing the axial contact position between the conical block and the conical disk.

[0009] Optionally, the adjustment component includes: The movable plate is slidably fitted inside the support column. The telescopic column is fixedly installed inside the support column cylinder, and its output end is connected to the movable plate to drive it to slide. The gear sleeve is linked to the movable disc via a push block. The gear sleeve has a rotating support for a transmission gear and a traction gear, which mesh with each other. The transmission gear has a support column that is slidably connected inside. One end of the support column is connected to a conical block, and the other end of the support column is fixedly connected to a connecting block. A tension spring is connected between the connecting block and the transmission gear.

[0010] Optionally, the traction structure includes: Two traction posts are located above and below the cable, respectively; A traction block, located on the traction column, is used to clamp the cable; A first support spring is provided between the traction block and the traction column to provide an adaptive clamping force to the traction block; The traction gear drives the coaxially connected traction column to rotate.

[0011] Optionally, it may also include an automatic cleaning mechanism; the automatic cleaning mechanism includes: Cleaning brush; A linkage component transmits the axial movement of the movable disc to the cleaning brush, so that the cleaning position of the cleaning brush corresponds to the current contact radius of the conical block and the conical disc.

[0012] Optionally, the linkage component includes: A limiting bracket installed inside the support sleeve; Support block connected to the movable plate; A second support spring is fixedly connected to the bottom surface of the support block, and a connecting rod is fixedly installed at the bottom end, the connecting rod supporting the cleaning brush.

[0013] Optionally, the stranded wire structure includes: A stranded wire reel is movably fitted inside a support frame. A support plate is fixedly connected to the outside of the stranded wire reel. Support wheels are movably supported inside the stranded wire reel and the support plate. Driven gear rings are fixedly fitted to the outside of the stranded wire reel and the support frame, respectively.

[0014] Optionally, the drive mechanism includes: Transmission chain; A servo motor, which is mounted on the base plate; The drive sprocket is connected to the output shaft of the servo motor; The driven sprocket is connected to the driving sprocket via a transmission chain; A connecting shaft is movably supported above and coaxially fixedly connected to the driven sprocket. Two driving gears are fixedly mounted on the outside of the connecting shaft. The two driving gears respectively mesh with the driven gear ring mounted on the outside of the support sleeve and the strand reel.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses a drive mechanism to synchronously control the winding structure and the traction structure. During the winding process, the rotation speed of the winch and the traction speed are relatively stable, avoiding the traction speed and the speed of the winch being out of sync, which would cause pitch fluctuations. At the same time, with the cooperation of the synchronous cleaning structure, the orthogonal friction contact radius can be cleaned, avoiding affecting the stability of the transmission.

[0016] 2. This invention employs a single servo motor drive, using a rigid mechanical transmission chain consisting of a connecting shaft, a driving gear, and a driven gear ring to synchronously distribute power, thereby eliminating signal delay and algorithm errors inherent in electronic control systems. This physical synchronization mechanism facilitates more precise and stable twisting pitch control, improving synchronization accuracy and pitch stability.

[0017] 3. This invention utilizes a friction transmission pair composed of a conical disc and a conical block, allowing for smooth changes in the transmission ratio through simple axial mechanical movement. Combined with the constant clamping force of the tension spring, the speed change process is smooth and reliable, avoiding the response delay of complex electronic speed regulation and achieving stable and reliable stepless pitch adjustment.

[0018] 4. The automatic cleaning mechanism of this invention enables the cleaning brush to move in real time in tandem with the contact radius of the conical block. This function automatically cleans impurities on the working surfaces of key friction pairs during equipment operation, reducing transmission ratio drift caused by friction powder accumulation, helping to extend the equipment's accuracy retention time and reduce maintenance frequency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the present invention; Figure 3 This is a schematic diagram of the connecting shaft structure of the present invention; Figure 4 This is a schematic diagram of the support sleeve structure of the present invention; Figure 5 This is a schematic diagram of the movable disk structure of the present invention; Figure 6 This is a schematic diagram of the conical disk structure of the present invention; Figure 7 This is a schematic diagram of the gear sleeve structure of the present invention; Figure 8 This is a schematic diagram of the traction column structure of the present invention; Figure 9 This is a schematic diagram of the cleaning brush structure of the present invention; Figure 10 This is a schematic diagram of the stranded coil structure of the present invention.

[0021] In the diagram: 1. Base plate; 2. Support frame; 3. Servo motor; 4. Drive sprocket; 5. Transmission chain; 6. Driven sprocket; 7. Connecting shaft; 8. Driven gear ring; 9. Parallel winding die; 10. Stranded wire reel; 11. Support plate; 12. Support wheel; 13. Support sleeve; 14. Conical disc; 15. Drive gear; 16. Support column cylinder; 17. Movable disc; 18. Telescopic column; 19. Push block; 20. Gear sleeve; 21. Transmission gear; 22. Traction gear; 23. Support column; 24. Conical block; 25. Tension spring; 26. Connecting block; 27. Traction column; 28. Support ring; 29. ​​Traction block; 30. First support spring; 31. Limiting frame; 32. Support block; 33. Second support spring; 34. Connecting rod; 35. Cleaning brush. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-10 The present invention provides a technical solution: A stranding equipment for producing cables for new energy storage systems. It includes the support assembly, drive mechanism, stranded wire structure, traction structure, and synchronous transmission device.

[0024] The support assembly includes a base plate 1 and an upper support frame 2.

[0025] The drive mechanism includes a servo motor 3, which is mounted on the base plate 1. The rated speed range of the servo motor 3 is recommended to be 0-1500 r / min, and the rated torque is not less than 20 N·m, so as to meet the power requirements of most new energy cable stranding processes.

[0026] The stranded wire structure is used to drive multiple wires to rotate and twist together. The working speed range of the stranding spool 10 is 50-500 r / min, and it is suitable for conductor cross-sections of 1.5-30 mm². 2 Production of multi-strand stranded cables.

[0027] The traction structure is used to clamp and linearly pull the stranded cable. The traction speed provided by the traction structure is usually set to 2-30m / min to adapt to the stranding process requirements of different pitches (the pitch range is usually 10-150mm).

[0028] The synchronous transmission device is located between the drive mechanism and the traction structure. This device is designed to transmit the power of the drive mechanism synchronously to the stranded wire structure and the traction structure through a purely mechanical means. This design enables the traction structure to maintain a stable transmission ratio with respect to the linear velocity of the traction structure and the rotational angular velocity of the stranded wire structure. The transmission ratio can be adjusted to meet different needs, thereby rigidly linking the traction and stranded wires and achieving a stable control speed ratio. The transmission ratio adjustment range is usually 1:5 to 1:30, which can cover the stranding process pitch requirements of most new energy cables.

[0029] The synchronous transmission device is equipped with a rotating main shaft driven by a drive mechanism. Part of the rotating main shaft is a support sleeve 13, on which a conical disk 14 is fixedly mounted. The power input end of the traction structure engages with the conical friction surface of the conical disk 14 through a friction transmission mechanism. By moving the friction transmission mechanism axially, the contact radius between it and the conical surface of the conical disk 14 is changed, thereby continuously and steplessly adjusting the ratio of the traction speed to the winding reel speed, achieving precise pitch adjustment. The cone angle of the conical disk 14 is preferably 15°-30°, and the surface hardness is not lower than HRC55 to ensure good friction transmission performance and wear resistance.

[0030] The friction transmission mechanism includes two conical blocks 24, which are centrally symmetrically arranged along the axis of the support sleeve 13. Their working surfaces roll in contact with the conical surface of the conical disk 14. The mechanism is also equipped with an adjustment component to drive the two conical blocks 24 to move synchronously along the axial direction, thereby precisely changing the contact radius. The conical blocks 24 are made of high wear-resistant alloy material with a surface roughness Ra≤0.8μm. It is recommended that the friction coefficient between them and the conical disk 14 be kept between 0.12 and 0.18 to balance transmission efficiency and wear control.

[0031] The adjustment assembly includes: a movable disc 17 slidably fitted inside the support column 16; a fixed telescopic column 18, the output end of which is connected to the movable disc 17; a gear sleeve 20 linked to the movable disc 17 via a push block 19, the gear sleeve 20 internally supporting a meshing transmission gear 21 and a traction gear 22, the inner hole of the transmission gear 21 being slidably fitted with a support column 23 via a spline or keyway, one end of the support column 23 being connected to a conical block 24, and the other end being fixed to a connecting block 26, a tension spring 25 connecting the connecting block 26 and the transmission gear 21, the movable disc 17 being driven to slide axially by the telescopic column 18, the motion being transmitted to the conical block 24 via the push block 19, gear sleeve 20, transmission gear 21 and support column 23 to achieve positioning; the tension spring 25 continuously provides radial clamping force to the conical block 24 pointing towards the conical disc 14 to ensure the reliability of friction transmission.

[0032] To improve the long-term stability of the equipment, an automatic cleaning mechanism is also provided. This mechanism includes a cleaning brush 35 and a set of linkage components. The linkage components convert the axial displacement of the movable disk 17 into the radial position adjustment of the cleaning brush 35 along the conical disk 14. This ensures that the cleaning end of the cleaning brush 35 is always aligned with the current actual contact radius of the conical block 24 and the conical disk 14. No matter how the equipment adjusts the pitch, the cleaning brush 35 can automatically track and clean impurities on the friction surface during operation, which helps to maintain transmission stability.

[0033] The linkage component comprises: a limiting frame 31 fixedly installed inside the support sleeve 13; a support block 32 fixed on the movable disc 17; and a connecting rod 34, one end of which is connected to the support block 32 via a second support spring 33, and the other end of which passes through the guide hole of the limiting frame 31 and is equipped with a cleaning brush 35. The second support spring 33 provides the necessary pressure to ensure that the cleaning brush 35 effectively contacts the surface of the conical disc 14.

[0034] The traction structure consists of two traction columns 27 located above and below the cable. Each traction column 27 is equipped with a traction block 29, and a first support spring 30 is provided between the traction block 29 and the traction column. The first support spring 30 provides adaptive clamping force to the traction block 29 to ensure stable clamping and conveying of cables of different diameters.

[0035] The drive mechanism also includes: a drive sprocket 4 mounted on the output shaft of the servo motor 3; a driven sprocket 6 connected to the drive sprocket 4 via a transmission chain 5; and a connecting shaft 7 coaxially fixed to the driven sprocket 6. Two drive gears 15 are fixedly mounted on the connecting shaft 7, which mesh with driven gear rings 8 fixed to the outside of the stranded reel 10 and the support sleeve 13, respectively. This mechanism ensures that the power of a single servo motor 3 is synchronously and reliably distributed to the stranded reel 10 and the conical disc 14. The transmission chain 5 is a roller chain, and the transmission ratio is usually set to 1:1 to 1:3 to ensure smooth power transmission and low noise.

[0036] The usage process of this embodiment is as follows: During the stranding process, after the servo motor 3 is started, the output shaft of the servo motor 3 drives the drive sprocket 4 to rotate. Through the transmission chain 5, the driven sprocket 6 and the connecting shaft 7 between the two support frames 2 rotate. The drive gear 15 outside the connecting shaft 7 synchronously drives the two driven gear rings 8 to rotate. The two driven gear rings 8 simultaneously drive the inner stranding disc 10 and the support sleeve 13 to rotate. During the rotation of the stranding disc 10, the support disc 11 and the support wheel 12 are controlled to rotate, thereby driving the outer layer of the battery core to rotate and strand around the outside of the central conductor, passing through the paralleling die 9 to complete the cable stranding. During the rotation of the support sleeve 13, the conical disc 14 is synchronously driven to rotate. The support sleeve 13 and the conical disc 14 are connected by separate bolts. This design facilitates the disassembly and maintenance of the surface of the conical disc 14. During the rotation of the conical disc 14, two conical blocks 24 mirrored along the axis are simultaneously controlled to rotate in opposite directions. During the rotation of the two conical blocks 24, the transmission gears 21 are controlled to rotate through the support columns 23. The transmission gears 21 control the rotation of the traction gears 22 through the meshing gears, thereby controlling the two traction columns 27 and the support rings 28 fixedly mounted on the outside of the traction columns 27 to rotate in the same direction above and below the stranded cable. The cable is continuously guided and transported by the traction blocks 29 outside the traction columns 27. The first support spring 30 can cooperate to connect the support rings 28 and the traction blocks 29, and support the traction blocks 29 to continuously apply pressure to the cable, thus achieving stable control of the pitch.

[0037] When the parameters of the twisting pitch need to be changed, after the machine is stopped, the output shaft of the telescopic column 18 inside the support column cylinder 16 is extended. The output shaft of the telescopic column 18 pushes the movable disc 17 forward. During the forward movement of the movable disc 17, the push block 19 pushes the gear sleeve 20 to move. The gear sleeve 20 pushes the conical block 24 forward through the transmission gear 21 and the support column 23, so that the diameter of the contact surface between the conical block 24 and the conical disc 14 is reduced. After switching the contact radius, the conical block 24 pushes the connecting block 26 to move towards the middle of the two gear sleeves 20. The tension spring 25 will continuously apply outward squeezing force to the connecting block 26, thereby pushing the conical block 24 and the conical disc 14 to fit stably, thereby adjusting the traction speed and the rotation speed ratio of the twisting disc.

[0038] Simultaneously, during the movement of the movable disc 17, the support block 32 will move synchronously, which in turn will move the connecting rod 34 through the transmission of the second support spring 33. The connecting rod 34 will move along the limit frame 31, thereby controlling the position of the bottom cleaning brush 35. With the cooperation of the second support spring 33, the cleaning brush 35 is always located on the same contact radius where the conical block 24 and the conical disc 14 are in contact. At the same time, the second support spring 33 can stably support the bottom surface of the cleaning brush 35 to be in contact with the surface of the conical disc 14, so that the cleaning brush 35 cleans the surface of the conical disc 14 in real time and avoids affecting the stability of friction.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stranding equipment for producing cables for new energy storage systems, comprising: The support assembly is characterized in that it further includes: Drive structure; The stranded wire structure is connected to the drive mechanism and is used to drive the wire to rotate and twist. A traction structure used to pull stranded cables; A synchronous transmission device is disposed between the drive mechanism and the traction structure; wherein... The synchronous transmission device can synchronously transmit the power of the drive mechanism to the stranded wire structure and the traction structure, so that the traction speed of the traction structure and the rotation speed of the stranded wire structure maintain a predetermined, adjustable transmission ratio.

2. The stranding equipment for producing cables for new energy storage systems according to claim 1, characterized in that, The support assembly consists of a base plate (1) and a support frame (2), with the support frame (2) fixedly supported above the base plate (1).

3. The stranding equipment for producing cables for new energy storage systems according to claim 2, characterized in that, The synchronous transmission device includes: The support sleeve (13), as part of the rotating main shaft, is driven by the drive mechanism; A conical disc (14) is fixedly fitted onto the support sleeve (13); The friction transmission mechanism engages with the conical disc (14) and transmits power to the traction structure; wherein, The transmission ratio between the traction structure and the stranded wire structure can be infinitely adjusted by changing the contact radius between the friction transmission mechanism and the conical disk (14).

4. The stranding equipment for producing cables for new energy storage systems according to claim 3, characterized in that, The friction transmission mechanism includes: A conical disk (14) is used to receive rotational power from the drive mechanism; Two conical blocks (24) are arranged symmetrically along the axial direction of the support sleeve (13) and are in rolling contact with the conical surface of the conical disk (14); An adjustment component is used to drive the two conical blocks (24) to move synchronously along the axial direction of the support sleeve (13) to change their contact radius with the conical disk (14); At least one conical block (24) is in frictional contact with the conical surface of the conical disk (14); The output speed is steplessly adjusted by changing the axial contact position between the conical block (24) and the conical disk (14).

5. The stranding equipment for producing cables for new energy storage systems according to claim 4, characterized in that, The adjustment component includes: The movable plate (17) is slidably fitted inside the support column (16); The telescopic column (18) is fixedly installed inside the support column tube (16), and its output end is connected to the movable disc (17) to drive it to slide. The gear sleeve (20) is linked to the movable disk (17) via the push block (19). The gear sleeve (20) has a rotating support for a transmission gear (21) and a traction gear (22), and the transmission gear (21) and the traction gear (22) mesh with each other. The transmission gear (21) has a sliding sleeve with a support column (23). One end of the support column (23) is connected to a conical block (24), and the other end of the support column (23) is fixedly connected to a connecting block (26). A tension spring (25) is connected between the connecting block (26) and the transmission gear (21).

6. The stranding equipment for producing cables for new energy storage systems according to claim 5, characterized in that, The traction structure includes: Two traction posts (27) are located above and below the cable, respectively; A traction block (29) is provided on the traction column (27) and is used to clamp the cable; A first support spring (30) is disposed between the traction block (29) and the traction column (27) to provide an adaptive clamping force for the traction block (29); The traction gear (22) drives the coaxially connected traction column (27) to rotate.

7. The stranding equipment for producing cables for new energy storage systems according to claim 5, characterized in that, It also includes an automatic cleaning mechanism; the automatic cleaning mechanism includes: Cleaning brush (35); The linkage component transmits the axial movement of the movable disk (17) to the cleaning brush (35) so that the cleaning position of the cleaning brush (35) corresponds to the current contact radius of the conical block (24) and the conical disk (14).

8. The stranding equipment for producing cables for new energy storage systems according to claim 7, characterized in that, The linkage component includes: A limiting frame (31) installed inside the support sleeve (13); Support block (32) connected to the movable plate (17); The bottom surface of the support block (32) is fixedly connected to a second support spring (33), and a connecting rod (34) is fixedly installed at the bottom end of the (33), and the connecting rod (34) supports the cleaning brush (35).

9. The stranding equipment for producing cables for new energy storage systems according to claim 3, characterized in that, The stranded wire structure includes: The stranded wire reel (10) is movably fitted inside the support frame (2). The outer side of the stranded wire reel (10) is fixedly connected to the support plate (11). The inner side of the stranded wire reel (10) and the support plate (11) is movably supported by the support wheel (12). The outer side of the stranded wire reel (10) and the support sleeve (13) are respectively fixedly fitted with driven toothed rings (8).

10. A stranding equipment for producing cables for new energy storage systems according to claim 9, characterized in that, The drive mechanism includes: Transmission chain (5); Servo motor (3), the servo motor (3) is mounted on the base plate (1); The drive sprocket (4) is connected to the output shaft of the servo motor (3); Driven sprocket (6), the driven curtain wheel (6) is connected to the driving sprocket (4) via a transmission chain (5); The connecting shaft (7) is movably supported above the (1) and coaxially fixedly connected to the driven sprocket (6). The connecting shaft (7) has two driving gears (15) fixedly mounted on its exterior. The two driving gears (15) respectively mesh with the driven gear ring (8) mounted on the support sleeve (13) and the outside of the stranded disc (10).

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