Optical cable SZ stranding and binding machine

Abstract

The application discloses a SZ stranding and binding machine for optical cable, and relates to the technical field of optical fiber equipment, which comprises a traction frame and a binding frame. A plurality of limiting seats are arranged on the traction frame in a spaced manner along the length direction of the traction frame. Each limiting seat is internally provided with a rotatable stranding pipe. The rotation directions of the stranding pipes in adjacent limiting seats are opposite. The binding frame is located at the output end of the traction frame, is used for receiving the stranding optical fiber sleeve from the traction frame, and performs yarn binding treatment on the stranding optical fiber sleeve. A pay-off shaft is arranged in the traction frame. The optical cable outer sheath material sequentially passes through the limiting shaft of the traction frame and the limiting assembly of the binding frame, and then enters the wrapping assembly of the binding frame. The wrapping assembly comprises two arc-shaped blocks which are oppositely arranged and have an adjustable interval. The application has the effect of uniform outer sheath.

Description

Technical Field

[0001] This invention relates to the technical field of optical fiber equipment, and in particular to an optical cable SZ stranding and tightening machine. Background Technology

[0002] As a crucial component of modern communication networks, the manufacturing process of optical cables directly impacts communication quality and signal transmission stability. SZ twisting is a common fiber arrangement method in optical cable manufacturing, using periodic forward and reverse twisting to reduce stress concentration and micro-bending loss. With the increasing demand for high-speed communication technologies such as 5G and data centers, higher requirements are being placed on the mechanical and transmission performance of optical cables.

[0003] Traditional fiber optic cable stranding and tightening equipment has several shortcomings in the manufacturing process. First, existing equipment often neglects the management of internal stress within the cable, which can lead to performance instability in high or low temperature environments, affecting the cable's lifespan. Second, traditional equipment can easily cause uneven tightness in the outer sheath during wrapping, affecting the overall stability of the cable, especially in environments with significant temperature variations, where loosening of the outer sheath can further impact performance. Furthermore, fiber splitting is complex and inconvenient, increasing construction and maintenance costs. Summary of the Invention

[0004] This application provides an optical cable SZ stranding and tightening machine, which has the function of uniform outer sheath.

[0005] This application provides an optical cable SZ stranding and tightening machine, which adopts the following technical solution:

[0006] A fiber optic cable SZ stranding and tightening machine includes a traction frame and a tightening frame. The traction frame is provided with a plurality of limiting seats arranged at intervals along its length. Each limiting seat contains a rotatable stranding tube, and the stranding tubes in adjacent limiting seats rotate in opposite directions. The tightening frame is located at the output end of the traction frame and is used to receive the stranded fiber optic sheath from the traction frame and perform yarn binding on it. The traction frame is provided with an unwinding shaft. The outer sheath material of the fiber optic cable passes sequentially through the limiting shaft of the traction frame and the limiting assembly of the tightening frame and then enters the wrapping assembly of the tightening frame. The wrapping assembly includes two arc-shaped blocks arranged opposite each other and with adjustable spacing. The area of ​​the arc-shaped blocks decreases uniformly from the entrance cross-section to the exit cross-section.

[0007] Preferably, the stranded tube in each of the limiting seats is driven to rotate by a drive motor and a belt drive assembly. The belt drive assembly includes a driving pulley connected to the output end of the drive motor, a driven pulley fixed coaxially with the stranded tube, and a belt connecting the two.

[0008] Preferably, the limiting seat is an arc-shaped block structure, and both ends of the limiting seat are connected to the shims fixed on the traction frame by bolts.

[0009] Preferably, the stranded tube is rotatably mounted in the limiting seat via a bearing, the inner ring of the bearing is fixedly connected to the stranded tube, and the outer ring of the bearing is fixedly connected to the limiting seat.

[0010] Preferably, an annular collar is provided at the entrance of the twisting hole of the twisted tube, and the annular collar is made of flexible material and fits tightly against the inner wall of the twisting hole.

[0011] Preferably, an extension rod is fixedly installed in the central hole of the stranded tube located at the output end of the traction frame. The extension rod has a plurality of mating holes corresponding to the stranded holes, and the mating holes are radially distributed along the central axis of the extension rod.

[0012] Preferably, the limiting component includes a U-shaped limiting block and a support body. A screw and a slide rod are provided in the support body, and the limiting block can slide left and right on the support body through the cooperation of the screw and the slide rod.

[0013] Preferably, the packaging assembly further includes a driving component, which includes a drive motor, a worm gear, and a worm wheel. The worm wheel is linked to the arc-shaped block through a first connecting rod and a second connecting rod. The drive motor drives the two worm wheels synchronously through the worm gear, causing the arc-shaped block to move towards or away from each other.

[0014] Preferably, the middle part of the second connecting rod is rotatably connected to the mounting plate of the drive component via a third connecting rod, and the third connecting rod and the second connecting rod together form a four-bar linkage to maintain the synchronous movement trajectory of the arc-shaped block.

[0015] Preferably, the outlet cross-sectional area of ​​the arc-shaped block is one-third to one-half of the inlet cross-sectional area.

[0016] In summary, this application has the following beneficial effects:

[0017] 1. The optical cable undergoes SZ stranding by alternating reverse rotation of multiple stranding tubes on the traction frame. Combined with the binding frame, the stranded fiber optic sheath is secured with yarn. An adjustable arc-shaped block with a uniformly decreasing area from the inlet to the outlet in the wrapping assembly tightly wraps the outer sheath of the optical cable. This results in effective stress release within the optical cable, excellent temperature expansion and contraction adaptability, convenient fiber splitting characteristics, and a tightly and uniformly formed outer sheath with a stable structure. It also effectively improves the performance stability of the optical cable under extreme temperature changes, greatly facilitating subsequent construction and maintenance. Simultaneously, it ensures precise and round outer diameter dimensions of the optical cable, comprehensively enhancing the protection of the internal optical fibers, thereby significantly improving the overall quality and service life of the optical cable.

[0018] 2. The two opposing arc-shaped blocks essentially act as a mold; they use their specific geometry and gradually shrinking space to apply uniform pressure to the outer sheath of the optical cable, causing it to gradually deform from a flat or initial state, eventually forming a circular or near-circular structure that tightly wraps around the central sleeve. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the optical cable SZ stranding and tightening machine in Example 1;

[0020] Figure 2 This is a schematic diagram of the overall structure of the traction frame in Example 1;

[0021] Figure 3 This is a schematic diagram of the internal structure of the linkage in Example 1;

[0022] Figure 4 This is a schematic diagram of the internal structure of the limiting component in Embodiment 2;

[0023] Figure 5 This is a schematic diagram of the internal structure of the packaging component in Embodiment 2;

[0024] Figure 6 This is a schematic diagram of the internal structure of the drive component in Embodiment 2;

[0025] Explanation of reference numerals in the attached drawings: 1. Traction frame; 2. Tying frame; 3. Limiting seat; 4. Winding tube; 5. Winding hole; 6. Center hole; 7. Protective baffle; 8. Drive motor; 9. Linking component; 901. Driven pulley; 902. Driven pulley; 903. Belt; 10. Raising block; 11. Bolt; 12. Bearing; 13. Annular collar; 14. Extension rod; 15. Unwinding shaft; 16. Limiting assembly; 1601. Limiting block; 1602. Support body; 1603. Screw; 1604. Slide rod; 17. Wrapping assembly; 1701. Stand; 1702. Arc block; 18. Yarn binding die; 19. Driving component; 1901. Mounting plate; 1902. Worm gear; 1903. Worm wheel; 1904. First connecting rod; 1905. Second connecting rod; 1906. Third connecting rod. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0027] Example 1

[0028] This invention discloses an optical cable SZ stranding and tightening machine, such as Figure 1 As shown, it includes a traction frame 1 and a clamping frame 2 for clamping and twisting optical cable bundles. The output end of the traction frame 1 faces the input end of the clamping frame 2. The upper surface of the traction frame 1 is provided with several coaxially arranged limiting seats 3. The limiting seats 3 are provided with rotatable twisting tubes 4 inside. The twisting tubes 4 are provided with a central hole 6 and twisting holes 5 for the optical fiber sheath to pass through. Several twisting holes 5 are arranged at equal angles around the central axis of the central hole 6. The twisting tubes 4 in adjacent limiting seats 3 rotate in opposite directions. By alternating forward and reverse rotation of the twisting tubes 4, continuous automatic SZ twisting and binding of the optical fiber sheath can be achieved.

[0029] like Figure 1 As shown, each stranded tube 4 in the machine can rotate independently. Crucially, adjacent stranded tubes 4 rotate in opposite directions. For example, the first stranded tube 4 rotates clockwise, the second counter-clockwise, the third clockwise again, and so on. As the fiber optic ferrule passes through these continuously rotating stranded tubes 4, they form a periodic S-shaped and Z-shaped alternating spiral structure in space, known as SZ stranding. This stranding method allows the fiber optic ferrule to twist both clockwise and counter-clockwise in the axial direction.

[0030] like Figure 2 and Figure 3As shown, specifically, a protective baffle 7 is fixedly installed on one side of the upper surface of the limiting seat 3. A drive motor 8 is mounted on the protective baffle 7. The drive motor 8 is driven by the stranded tube 4 via a linkage 9. The linkage 9 includes a driven pulley 901 and a driving pulley 902. The driven pulley 901 is coaxially fixed to the stranded tube 4. The driving pulley 902 is connected to the output end of the drive motor 8. The driven pulley 901 and the driving pulley 902 are connected by a belt 903. When the drive motor 8 operates, it drives the driving pulley 902 to rotate. When the driving pulley 902 rotates, the belt 903 is driven by friction with it. Since the belt 903 is connected to the driven pulley 901, the movement of the belt 903 drives the driven pulley 901 to rotate synchronously, thus driving the stranded tube 4.

[0031] like Figure 3 As shown, the limiting seat 3 is an arc-shaped block structure. Both ends of the limiting seat 3 extend and are connected to the shim block 10, which is fixed to the traction frame 1, by bolts 11. The bolt connection 11 is a very reliable and robust fixing method, ensuring that the limiting seat 3 can be firmly installed on the traction frame 1 without loosening or displacement during use. The shim block 10 is designed to provide a precise installation height or allow for fine-tuning during installation to ensure perfect alignment of the limiting seat 3 with the stranded tube 4 in the system, compensating for any manufacturing tolerances or meeting specific process requirements.

[0032] like Figure 3 As shown, the limiting seat 3 has a bearing 12 inside, and the stranded tube 4 rotates within the inner ring of the bearing 12. This means that the stranded tube 4 and the inner ring of the bearing 12 are in close contact. When the stranded tube 4 rotates, the inner ring of the bearing 12 also rotates, while the outer ring of the bearing 12 is fixed on the limiting seat 3. This configuration ensures the stable and low-friction rotation of the stranded tube 4.

[0033] like Figure 3 As shown, the stranding hole 5 of the stranding tube 4 is provided with an annular collar 13. The annular collar 13 has an annular structure and is made of flexible material. It is located at the entrance of the stranding hole 5. The flexible material of the annular collar 13 allows it to deform slightly. When multiple strands of material converge and enter the stranding hole 5, the flexibility of the collar allows it to adaptively adjust to minor changes in the size or shape of the material bundle, thus providing a smooth and stable entrance guide. Before the material bundle enters the rigid part of the stranding hole 5, the flexible collar applies gentle circumferential pressure to it, helping to initially integrate and bundle the multiple strands of material, preventing them from scattering, tangling, or becoming disordered before entering the high-speed rotating stranding process.

[0034] like Figure 3 As shown, the flexible material, as the first contact point, can buffer the impact that may be generated when the material enters at high speed, while protecting the hard inner wall of the twisted hole 5 from direct wear.

[0035] like Figure 3 As shown, specifically, by pre-coalescing and stabilizing the material bundle at the inlet, the wire bundle entering the stranding hole 5 is ensured to be more compact and uniform, thereby improving the structural stability and appearance quality of the final stranded product and reducing quality problems such as skipped wires and loose strands caused by material dispersion. Moreover, the flexible collar, as a consumable part or buffer layer, withstands the initial friction and impact generated when the material enters, effectively protecting the inner wall of the stranding tube 4 and the hard surface of the stranding hole 5 from excessive wear, and extending the service life of the main equipment components.

[0036] like Figure 3 As shown, because the flexible collar can deform slightly, it can better adapt to different batches or slightly different material diameters, strand counts or material properties without frequent replacement or adjustment of the fixing parts, increasing the versatility and flexibility of the equipment.

[0037] like Figure 3 As shown, an extension rod 14 is fixedly installed in the center hole 6 of the stranding tube 4 located at the output end of the traction frame 1. The extension rod 14 has several mating holes at equal angles that match the stranding hole 5. The extension rod 14 gathers the optical cable bundle at a point and enters the yarn binding mold 18 in the binding frame 2 to achieve the yarn binding function.

[0038] like Figure 3 As shown, several mating holes, which are equally spaced inside the extension rod 14 and match the twisting holes 5, are used to receive the already twisted optical cable bundles output from the twisting tube 4. These mating holes ensure that each strand of the cable bundle enters the extension rod 14 with an accurate relative position and angle, thereby ensuring that the subsequent convergence process can be carried out precisely.

[0039] like Figure 3 As shown, the structural design of the extension rod 14 forces the individual optical cable bundles entering it to be forcibly guided and gradually converge toward the central axis after passing through the docking holes, ultimately forming a highly compact, geometrically stable, and point-shaped convergence at the exit of the extension rod 14. The extension rod 14 acts as a smooth transition device between the stranding and binding processes. It provides an ideal, predetermined reference shape, ensuring that the binding die 18 can efficiently and uniformly bind the cable core.

[0040] like Figure 3 As shown, the optical cable bundle is brought together into a tight, point-like geometry, providing a stable and standardized core for the binding die 18. This ensures that the binding yarn can be wound evenly and tightly around the outside of the cable core, avoiding loose, irregular, or overlapping binding yarn.

[0041] Example 2

[0042] like Figure 4 As shown, the traction frame 1 has an unwinding shaft 15 inside for unwinding the outer sheath of the optical cable. One end of the outer sheath is wound layer by layer onto the unwinding shaft 15, and the other end of the outer sheath passes sequentially through a limiting shaft on the traction frame 1, a limiting component 16 on the tightening frame 2, and a wrapping component 17 on the tightening frame 2. The wrapping component 17 wraps the outer sheath around the surface of the tightened fiber optic tube, forming an outer sheath on its surface. The unwinding shaft 15 inside the traction frame 1 is responsible for smoothly releasing the layered outer sheath material. The traction force and unwinding speed are precisely controlled to ensure that the outer sheath material maintains appropriate tension throughout the process, avoiding slack or excessive stretching, providing a stable foundation for subsequent wrapping. The outer sheath of the optical cable passes sequentially through the limiting shaft on the traction frame 1 and the limiting component 16 on the tightening frame 2. The function of these components is to precisely guide the outer sheath material and the fiber optic tube, ensuring that they are aligned and maintain the correct relative position before entering the wrapping assembly 17, thereby guaranteeing that the outer sheath can be uniformly and concentrically wrapped around the surface of the fiber optic tube. The wrapping assembly 17 on the clamping frame 2 is the core mechanism, responsible for bonding the pre-tied fiber optic tube to the outer sheath material. This assembly typically uses methods such as rotating molds, extrusion molding, or continuous winding to tightly wrap the outer sheath material around the outside of the fiber optic tube, forming a continuous, integrated optical cable outer sheath on its surface. This process may involve precise temperature and pressure control to ensure good adhesion or fusion between materials, thereby forming a robust and durable outer sheath.

[0043] like Figure 4 As shown, the outer sheath of the optical cable is the first line of defense. It can effectively resist external mechanical damage, such as compression, bending, friction, impact, and shearing forces, thereby protecting the fragile optical fibers inside from damage.

[0044] like Figure 4 As shown, the limiting component 16 includes a U-shaped limiting block 1601, with a limiting channel inside the limiting block 1601 for the outer sheath of the optical cable to pass through. The U-shaped limiting block 1601 has a limiting channel inside that matches the size of the outer sheath of the optical cable. When the outer sheath of the optical cable passes through this channel, it is physically constrained within the channel, thereby achieving initial positioning and guidance. The U-shaped design may help to better wrap and guide the outer sheath of the optical cable, reducing its vertical jump or deviation.

[0045] like Figure 5 and Figure 6As shown, the limiting component 16 also includes a support body 1602. The support body 1602 has a screw 1603 and a slide rod 1604 inside. Both the screw 1603 and the slide rod 1604 pass through the inside of the support body 1602. By rotating the screw 1603, the limiting block 1601 slides left and right on the slide rod 1604 to achieve the function of correcting the outer sheath of the optical cable.

[0046] like Figure 5 and Figure 6 As shown, the packaging assembly 17 includes a support frame 1701. Inside the support frame 1701 are two opposing arc-shaped blocks 1702. The area of ​​the arc-shaped blocks 1702 decreases uniformly from the entrance cross-section to the exit cross-section, and the tightly bound fiber optic sleeve passes between the two arc-shaped blocks 1702, forming a gradually contracting channel. When the outer sheath of the optical cable enters this channel, its two sides contact the inner surface of the arc-shaped blocks 1702. The uniform reduction of the area of ​​the arc-shaped blocks 1702 from the entrance cross-section to the exit cross-section is crucial. This means that as the outer sheath of the optical cable moves inward along the arc-shaped blocks 1702, the space it occupies gradually decreases. This uniform contraction force forces the two sides of the outer sheath of the optical cable to begin to bend inward. Because the final shape of the channel and the size of the exit match the dimensions of the tightly bound fiber optic sleeve, the outer sheath is precisely shaped to tightly wrap around the surface of the fiber optic sleeve.

[0047] like Figure 5 and Figure 6 As shown, with the cross-sectional area continuously decreasing and the tightly bound fiber optic tube passing between the two arc-shaped blocks 1702 as a central axis, the outer sheath of the optical cable is forced to bend along the inner surface of the arc-shaped blocks 1702. It is eventually shaped and tightly wrapped around the surface of the central fiber optic tube until the wrapping is complete.

[0048] like Figure 5 and Figure 6 As shown, the support frame 1701 is provided with a driving component 19 for driving the relative movement of two arc-shaped blocks 1702. The driving component 19 includes a mounting plate 1901 and a drive motor fixed on the mounting plate 1901. The output end of the drive motor is connected to a worm gear 1902. Both sides of the worm gear 1902 are meshed with worm wheels 1903. The axial surface of the worm wheel 1903 is fixedly connected to a first connecting rod 1904. The free end of the first connecting rod 1904 is rotatably connected to one end of a second connecting rod 1905. The other end of the second connecting rod 1905 is connected to the outside of the arc-shaped block 1702. The middle part of the second connecting rod 1905 is rotatably connected to the mounting plate 1901 through a third connecting rod 1906.

[0049] The drive motor rotates, and the worm gear 1902 connected to its output end also rotates. The worm gear 1902 meshes with two worm wheels 1903 on the left and right sides. When the worm gear 1902 rotates, it simultaneously drives the two worm wheels 1903 to rotate synchronously. A first connecting rod 1904 is fixedly connected to the axial surface of each worm wheel 1903. As the worm wheel 1903 rotates, the free end of the first connecting rod 1904 will rotate around the center of the worm wheel 1903. One end of the second connecting rod 1905 is rotatably connected to the free end of the first connecting rod 1904, while the other end of the second connecting rod 1905 is connected to the outside of the arc-shaped block 1702. A third connecting rod 1906 connects the middle of the second connecting rod 1905 and the mounting plate 1901, playing an important guiding and supporting role. Together with the first connecting rod 1904 and the second connecting rod 1905, it forms a linkage mechanism. Under the coordinated action of the first connecting rod 1904 and the third connecting rod 1906, the second connecting rod 1905 will move along a preset trajectory, thereby driving the arc block 1702 connected to it to move inward or outward, and precisely adjusting the distance between the two arc blocks 1702.

[0050] By adjusting the spacing of the arc-shaped blocks 1702, it can be adapted to fiber optic sleeves of different cross-sectional sizes, thus exhibiting good versatility.

[0051] Working principle: During the process of stranding optical fiber sleeves, several optical fiber sleeves are passed through the stranding holes 5 of the stranding tube 4 in sequence. By starting the drive motor 8, the stranding tubes 4 in adjacent limit seats 3 rotate in opposite directions, forming a periodic S-shaped and Z-shaped alternating spiral structure in space, which is used to form SZ stranding.

[0052] At the same time, the outer sheath of the optical cable is unwound by the unwinding spool 15, and the outer sheath of the optical cable is wrapped around the surface of the tightly bound optical fiber tube by the wrapping component 17, forming an outer sheath of the optical cable on its surface.

[0053] 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 fiber optic cable SZ stranding and tightening machine, characterized in that, The device includes a traction frame (1) and a tightening frame (2). The traction frame (1) is provided with a plurality of limiting seats (3) arranged at intervals along its length. Each limiting seat (3) is provided with a rotatable stranding tube (4). The stranding tubes (4) in adjacent limiting seats (3) rotate in opposite directions. The tightening frame (2) is located at the output end of the traction frame (1) and is used to receive the stranded optical fiber sleeve from the traction frame (1) and perform yarn binding on it. The traction frame (1) is provided with an unwinding shaft (15). The outer sheath material of the optical cable passes through the limiting shaft of the traction frame (1) and the limiting component (16) of the tightening frame (2) in sequence and then enters the wrapping component (17) of the tightening frame (2). The wrapping component (17) includes two arc-shaped blocks (1702) arranged opposite each other and with adjustable spacing. The area of ​​the arc-shaped block (1702) decreases uniformly from the entrance section to the exit section. The twisting tube (4) is provided with a central hole (6) and a twisting hole (5) for the optical fiber sleeve to pass through.

2. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The stranded tube (4) in each of the limiting seats (3) is driven to rotate by a drive motor (8) and a belt drive assembly. The belt drive assembly includes a driving pulley (902) connected to the output end of the drive motor (8), a driven pulley (901) fixed coaxially with the stranded tube (4), and a belt (903) connecting the two.

3. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The limiting seat (3) is an arc-shaped block structure. The two ends of the limiting seat (3) are connected to the shim block (10) fixed on the traction frame (1) by bolts (11).

4. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The stranded tube (4) is rotatably mounted in the limiting seat (3) via a bearing (12). The inner ring of the bearing (12) is fixedly connected to the stranded tube (4), and the outer ring of the bearing (12) is fixedly connected to the limiting seat (3).

5. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, An annular collar (13) is provided at the entrance of the twisting hole (5) of the twisted tube (4). The annular collar (13) is made of flexible material and fits tightly against the inner wall of the twisting hole (5).

6. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, An extension rod (14) is fixedly installed in the center hole (6) of the twisting tube (4) located at the output end of the traction frame (1). The extension rod (14) has several docking holes corresponding to the twisting hole (5) inside. The docking holes are radially distributed along the central axis of the extension rod (14).

7. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The limiting component (16) includes a U-shaped limiting block (1601) and a support body (1602). The support body (1602) is provided with a screw (1603) and a slide rod (1604). The limiting block (1601) can slide left and right on the support body (1602) through the cooperation of the screw (1603) and the slide rod (1604).

8. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The packaging assembly (17) also includes a driving component (19), which includes a driving motor, a worm gear (1902) and a worm wheel (1903). The worm wheel (1903) is linked to the arc-shaped block (1702) through a first connecting rod (1904) and a second connecting rod (1905). The driving motor drives the two worm wheels (1903) synchronously through the worm gear (1902) to move the arc-shaped block (1702) towards or away from each other.

9. The optical cable SZ stranding and tightening machine according to claim 8, characterized in that, The middle part of the second connecting rod (1905) is rotatably connected to the mounting plate (1901) of the drive member (19) through the third connecting rod (1906). The third connecting rod (1906) and the second connecting rod (1905) together form a four-bar linkage to maintain the synchronous movement trajectory of the arc block (1702).

10. The optical cable SZ stranding and tightening machine according to claim 1, characterized in that, The outlet cross-sectional area of ​​the arc-shaped block (1702) is one-third to one-half of the inlet cross-sectional area.

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