Telescopic rotary submarine cable back-twist frame

Abstract

The invention discloses a telescopic rotary submarine cable back-twist frame, and relates to the technical field of submarine cable laying. A traditional back-twist frame malfunctions due to the fact that the magnitude of tension cannot be distinguished, so that a submarine cable laying path is unstable, and abrasion is aggravated. The device comprises a fixed stand column, the top of the fixed stand column is rotationally connected with a rotary arm, one end of the rotary arm is provided with an untwisting device, and the untwisting device comprises an adjusting mechanism and an alignment adjusting frame in sliding fit with the adjusting mechanism; the adjusting mechanism comprises a fixed shell fixedly installed on the rotary arm, a movable frame is elastically and slidably installed on the fixed shell, symmetrical top wheels are rotationally arranged at the two ends of the movable frame, a second elastic piece is installed on the fixed shell, and lower pressing wheels staggered with the top wheels are rotationally arranged at the end of the second elastic piece. Transmission pieces are installed at the bottoms of the movable frames. A submarine cable penetrates through the butt joint groove of the alignment adjusting frame, S-shaped winding is achieved through the top wheels and the lower pressing wheels which are arranged in a staggered mode in the adjusting mechanism, the submarine cable path can be rapidly adjusted, tension can be released, submarine cable abrasion is effectively reduced, and laying safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of submarine cable laying technology, and in particular to a telescopic rotary submarine cable untwisting frame. Background Technology

[0002] The rotary cable de-torsion frame is a key piece of equipment used in submarine cable laying operations to eliminate torsional stress in submarine cables. It is widely used in the laying of submarine cables and optical cables.

[0003] The core function of a de-torsion frame is to dynamically adjust the attitude of the submarine cable through a buffer and transmission system to release accumulated torque. However, the existing de-torsion frame's buffer and transmission system adopts a "single threshold trigger" design, which cannot distinguish the fluctuation range of the tension on the submarine cable, resulting in a significant defect: when encountering small tension fluctuations, the system is easily triggered falsely, causing the buffer components to operate frequently, leading to unnecessary extension, contraction, or rotation of the de-torsion frame, resulting in an unstable submarine cable laying path, increased friction and wear with guide wheels and cable reels, and even causing localized shaking of the submarine cable, damaging the integrity of the sheath. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that traditional untwisting frames are prone to accidental triggering when encountering small-amplitude tension fluctuations, leading to frequent operation of the buffer components, which in turn causes instability in the submarine cable laying path, increased friction and wear, and damage to the integrity of the sheath. Therefore, a telescopic rotary submarine cable untwisting frame is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A telescopic rotating submarine cable untwisting frame includes a fixed column, a rotating arm rotatably connected to the top of the fixed column, and an untwisting device at one end of the rotating arm. The untwisting device includes an adjustment mechanism and an alignment adjustment frame that slides with it. The adjustment mechanism includes a fixed shell fixedly mounted on the rotating arm, a movable frame elastically slidably mounted on the fixed shell, symmetrical top wheels rotating at both ends of the movable frame, and a second elastic element mounted on the fixed shell. A lower pressure wheel, staggered with the top wheels, is rotatably mounted at the end of the second elastic element. A transmission component is mounted at the bottom of the movable frame, and a docking gear rotates on one side of the fixed shell. When the torque is too high, the transmission component drives the docking gear to rotate. The alignment adjustment frame includes a sliding sleeve and a docking groove. A docking rack that meshes with the docking gear is fixed on the sliding sleeve. The submarine cable passes through the docking groove and is offset by the top wheels and lower pressure wheels to achieve an S-shaped winding. When the tension is slight, the position of the submarine cable on the top wheels remains unchanged. When the tension is high, the movable frame moves down and is driven by the transmission component to make the docking gear engage with the docking rack, thus moving the alignment adjustment frame away from the adjustment mechanism.

[0006] This technical solution intelligently distinguishes the fluctuation range of submarine cable tension and makes graded responses, thereby effectively avoiding malfunctions and ensuring the stability of the laying path and the safety of the submarine cable. When there are slight tension fluctuations, the lower pressure wheel can independently provide elastic buffering, while the top wheel and movable frame remain stationary, avoiding unnecessary movement of the entire adjustment mechanism and alignment adjustment frame, fundamentally eliminating false triggering and ensuring the stability of the laying path. When the tension is large, the submarine cable presses against the top wheel, causing the entire movable frame to overcome elastic force and move downwards, thereby triggering the transmission component to drive the subsequent gear and rack mechanism. When the large tension triggers the movable frame to move downwards, the transmission component drives the docking gear to rotate, which in turn drives the meshing docking rack and sliding sleeve to move, causing the entire alignment adjustment frame to move away from the adjustment mechanism. This action can quickly adjust the cable's lead-out path and angle, actively releasing excessive tension and preventing damage to the submarine cable due to excessive tension. The structure has a high degree of integration, requires no external power source, and relies entirely on the mechanical structure to automatically respond to changes in submarine cable tension, resulting in high reliability. This technical solution addresses the key pain points of traditional anti-torsion frames, which cannot distinguish between different tension levels and are prone to malfunction. It achieves intelligent functions such as buffering small fluctuations and actively adjusting large tensions, which is of great significance for protecting submarine cables and ensuring the safe and smooth progress of laying operations.

[0007] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: The transmission component includes a pressure rod fixedly connected to the center of the bottom of the movable frame. A second rod is hinged to the bottom end of the pressure rod, and a first rod is hinged to the other end of the second rod and rotatably connected to the fixed shell. A drive rack is hinged to the end of the first rod away from the second rod and slidably connected to the fixed shell.

[0008] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: A mating sleeve is slidably connected to the outer wall of the connecting end of rod one and rod two. A return spring with one end connected to the mating sleeve is sleeved on the outer wall of rod one. An inclined surface is opened at the end of the mating sleeve near rod two. A top block is fixedly installed inside the fixed shell at the position below the inclined surface.

[0009] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: The bottom of the fixed housing is provided with a limiting groove that matches the drive rack. The limiting groove is used to restrict the sliding direction of the drive rack.

[0010] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: An elastic element is provided between the bottom of the movable frame and the fixed shell, and the downward pressure applied by the elastic element is less than the lifting force of the elastic element.

[0011] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: The mating gear includes a large gear rotatably connected to the fixed shell, and a small gear is fixedly connected inside the large gear. The diameter of the large gear is at least three times the diameter of the small gear.

[0012] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: The pinion meshes with the drive rack, and the mating rack meshes with the large gear.

[0013] As a further description of the aforementioned telescopic rotating submarine cable untwisting frame: Both the top roller and the bottom roller have an arc-shaped concave structure, which is symmetrically distributed along the axial direction. The diameters at both ends are large and the diameter in the middle is small. The two ends are smoothly transitioned to the middle through a curved surface.

[0014] In summary, due to the adoption of the above-mentioned telescopic rotating submarine cable untwisting frame technology, the beneficial effects of this invention are: The top wheel and the lower pressure wheel form an "upper pressure, lower support" structure. During small tension fluctuations, only the lower pressure wheel provides cushioning, preventing malfunctions of the adjustment mechanism and alignment frame. When tension increases sharply, the movable frame moves downwards, amplifying the driving force of the transmission components via a 1:3 transmission between the large and small gears. This amplifies the force, and then controls the docking rack to drive the sliding sleeve to quickly push the docking groove to the center of the cable reel, shortening the response time to sudden tension. The arc-shaped concave structure of the top and lower pressure wheels, along with the curved docking groove, guides the submarine cable to center, accommodating radial oscillation. The sliding sleeve resets, restoring the original length of the submarine cable path, reducing tensile damage to the insulation layer, preventing the armor layer of large-section submarine cables from breaking due to excessive stress, extending service life, and ensuring safety. When tension is too high, the pressure rod pushes rod two downwards, causing the inclined surface of the docking sleeve to contact and displace the top block, releasing the constraint between rod one and rod two. Rod two bends to break the force transmission, and the sliding sleeve resets under the weight of the submarine cable. The elastic element one drives the movable frame to reset, and the docking sleeve, under the action of the reset spring, re-constrains the hinge point, forming a cyclical system to ensure continuous stability. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the form switching structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the separation structure of the un-twist device of the present invention.

[0018] Figure 4 This is a schematic diagram of the alignment adjustment frame structure of the present invention.

[0019] Figure 5 This is a cross-sectional structural schematic diagram of the adjustment mechanism of the present invention.

[0020] Figure 6This is a schematic diagram of the separation structure of the adjustment mechanism of the present invention.

[0021] Figure 7 This is a schematic diagram of the transmission component structure of the present invention.

[0022] Figure 8 This is a partial cross-sectional view of the transmission component of the present invention.

[0023] Figure 9 This is a schematic diagram of the docking gear structure of the present invention.

[0024] Legend: 1. Fixed column; 2. Rotary arm; 3. Unwinding device; 31. Adjusting mechanism; 311. Fixed shell; 3111. Limiting groove; 312. Movable frame; 3121. Top wheel; 3122. Elastic element one; 313. Elastic element two; 3131. Lower pressure wheel; 314. Transmission component; 3141. Rod 1; 3142. Rod 2; 3143. Pressure rod; 3144. Connecting sleeve; 3145. Inclined surface; 3146. Return spring; 3147. Drive rack; 315. Top block; 316. Connecting gear; 3161. Large gear; 3162. Small gear; 32. Alignment adjustment bracket; 321. Sliding sleeve; 322. Dating rack; 323. Dating groove. Detailed Implementation

[0025] The technical telescopic rotating submarine cable untwisting frame of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1-9As shown, the present invention provides a telescopic rotating submarine cable untwisting frame, comprising a fixed column 1, a rotating arm 2 rotatably connected to the top of the fixed column 1, an untwisting device 3 provided at one end of the rotating arm 2, the untwisting device 3 including an adjusting mechanism 31 and an alignment adjusting frame 32 slidably engaged therewith; the adjusting mechanism 31 includes a fixed shell 311 fixedly mounted on the rotating arm 2, a movable frame 312 elastically slidably mounted on the fixed shell 311, and symmetrical top wheels 3121 rotating at both ends of the movable frame 312; the fixed shell... Elastic element 2 313 is installed on 311. At the end of elastic element 2 313, there is a downward pressure wheel 3131 that is staggered with the top wheel 3121. Elastic element 1 3122 is provided between the bottom of the movable frame 312 and the fixed shell 311. The downward pressure applied by elastic element 2 313 is less than the lifting force of elastic element 1 3122. Both the top wheel 3121 and the downward pressure wheel 3131 are arc-shaped concave structures, symmetrically distributed along the axial direction, with large diameters at both ends and small diameters in the middle. The two ends are smoothly transitioned to the middle through a curved surface.

[0027] In more detail, the fixed column 1 and the rotating arm 2 constitute the basic support structure of the un-twist frame. The un-twist device 3 at one end of the rotating arm 2 is used to realize the dynamic adjustment function during the laying of the submarine cable. The downward pressure applied by the elastic element 2 313 is less than the lifting force of the elastic element 1 3122. The difference in elastic force ensures priority response to large tension changes and avoids false triggering by small fluctuations. The elastic element 2 313 applies a downward pressure to the pressure wheel 3131 to form a "top pressure and bottom support" constraint structure, so that this section of the submarine cable forms a "shallow S-shape". This allows the top wheel 3121 and the pressure wheel 3131 to better collect the omnidirectional tension of the submarine cable, and also facilitates the stable transmission of the submarine cable between the wheel sets and the un-twist operation. The top wheel 3121 and the pressure wheel 3131 are both arc-shaped concave structures, symmetrically distributed along the axial direction, with a large diameter at both ends and a small diameter in the middle. The two ends are smoothly transitioned to the middle through a curved surface, and the curved surface fits the outer circle of the submarine cable. This structure can guide the submarine cable to automatically center itself, adapt to its radial swing, reduce wear, and help release torsional stress. When the submarine cable laying encounters small tension fluctuations, the submarine cable located between the top roller 3121 and the bottom roller 3131 straightens, thereby buffering by lifting the bottom roller 3131. The elastic element 2 313 will keep the bottom roller 3131 always in contact with the surface of the submarine cable. Since the downward pressure of the elastic element 2 313 is less than the lifting force of the elastic element 1 3122, the position of the top roller 3121 remains basically unchanged.

[0028] A transmission component 314 is installed at the bottom of the movable frame 312. A docking gear 316 rotates on one side of the fixed shell 311. When the torque is too large, the transmission component 314 drives the docking gear 316 to rotate. The alignment adjustment frame 32 includes a sliding sleeve 321 and a docking groove 323. A docking rack 322 that meshes with the docking gear 316 is fixed on the sliding sleeve 321. The submarine cable passes through the docking groove 323 and is offset against the lower pressure wheel 3131 by the top wheel 3121 to achieve S-shaped winding. When the tension is slight, the position of the submarine cable on the top wheel 3121 remains unchanged. When the tension is large, the movable frame 312 moves down and is driven by the transmission component 314 to make the docking gear 316 cooperate with the docking rack 322 to make the alignment adjustment frame 32 move away from the adjustment mechanism 31.

[0029] In more detail, when faced with a sudden increase in tension, the submarine cable will lift the lower pressure wheel 3131. At the same time, the submarine cable will also exert a downward pressure on the top wheel 3121 and the movable frame 312. When the movable frame 312 moves down, it pushes the pressure rod 3143 to fall vertically. The bottom end of the pressure rod 3143 applies a vertical downward force to the hinge point of the second rod 3142. Because the thrust of the return spring 3146 keeps the docking sleeve 3144 locked at the connection of the two rods, it prevents the first rod 3141 and the second rod 3142 from rotating relative to each other around the hinge point, ensuring that the force can be transmitted in a straight line from the second rod 3142 to the first rod 3141. The combination of lever 3141 and lever 3142 acts as a lever, converting the downward force of the pressure lever 3143 into an upward force at the end of lever 3141. This causes the drive rack 3147 to drive the pinion 3162 to rotate. Simultaneously, the pinion 3162 rotates, controlling the movement of the docking rack 322 via the large gear 3161. This double-gear structure (large gear 3161 and pinion 3162) with a 1:3 transmission ratio design converts the small movement of the drive rack 3147 into a large displacement of the docking rack 322. This ensures that the unwinding frame can quickly push the docking groove 323 in the sliding sleeve 321 to the center area of ​​the cable reel when sudden tension changes occur, shortening the response time. The docking groove 323 guides the submarine cable path, and its curved design can adaptively adjust the cable's direction.

[0030] Transmission component 314 includes a pressure rod 3143 fixedly connected to the center of the bottom of the movable frame 312. A second rod 3142 is hinged to the bottom end of the pressure rod 3143. A first rod 3141, rotatably connected to the other end of the second rod 3142, is hinged to the other end of the second rod 3142. A drive rack 3147, slidably connected to the fixed housing 311, is hinged to the end of the first rod 3141 away from the second rod 3142. A mating sleeve 31 is slidably connected to the outer wall of the connection end between the first rod 3141 and the second rod 3142. 44. A return spring 3146 is fitted on the outer wall of rod 1 3141, with one end connected to the docking sleeve 3144. The docking sleeve 3144 has an inclined surface 3145 at one end near rod 2 3142. A top block 315 is fixedly installed inside the fixed shell 311 at a position below the inclined surface 3145. A limiting groove 3111 matching the drive rack 3147 is provided at the bottom of the fixed shell 311. The limiting groove 3111 is used to limit the sliding direction of the drive rack 3147.

[0031] In more detail, the connection point between rod 1 3141 and fixed shell 311 forms a lever fulcrum. Under normal conditions, the docking sleeve 3144 maintains the covering and locking of the connection end between rod 1 3141 and rod 2 3142. At this time, the design maintains rigid transmission under normal working conditions, converting the downward stroke of the pressure rod 3143 into the movement of the drive rack 3147. When the tension of the submarine cable is too high, the pressure rod 3143 will press rod 2 3142 to the lowest point, thereby reaching an overload state. During this process, the top block 315 contacts the inclined surface 3145 and forces the docking sleeve 3144 to displace and unlock, and automatically releases the linkage to protect the mechanism from damage. At this time, the hinge point between rod 1 3141 and rod 2 3142 is exposed. After the constraint of the docking sleeve 3144 is removed, the second rod 3142 can bend around the hinge point, and the first rod 3141 loses the force transmitted by the second rod 3142. At this time, the sliding sleeve 321 quickly resets under the gravity of the submarine cable, and the elastic element 3122 pushes the movable frame 312 to reset simultaneously. When the first rod 3141 and the second rod 3142 are in a straight line state again, the docking sleeve 3144 also resets. The unlocking threshold of the docking sleeve 3144 can be precisely set by adjusting the installation height of the top block 315, thereby realizing the dual functions of 'overload protection' and 'automatic reset'.

[0032] The mating gear 316 includes a large gear 3161 rotatably connected to the fixed housing 311, and a small gear 3162 fixedly connected inside the large gear 3161. The diameter of the large gear 3161 is at least three times the diameter of the small gear 3162. The small gear 3162 meshes with the drive rack 3147, and the mating rack 322 meshes with the large gear 3161.

[0033] In more detail, the large gear 3161 and the small gear 3162 are coaxially fixedly connected to form a 1:3 transmission ratio. The small gear 3162 directly meshes with and drives the rack 3147, converting the lever motion of the rod 3141 into rotational motion. Then, the axial displacement of the sliding sleeve 321 is directly controlled through the large gear 3161 and the mating rack 322. This dual-gear structure has the dual functions of displacement amplification and self-locking, ensuring a rapid response to sudden tension changes.

[0034] Working principle: The submarine cable first passes through the docking slot 323 of the alignment adjustment frame 32 to ensure accurate initial positioning. It then passes over the top of the top roller 3121, simultaneously being pressed down from above by the bottom roller 3131, forming initial constraint. After passing through the untwisting device 3, the submarine cable is lowered vertically into the laying stage. Elastic element two 313 applies a smaller downward pressure, while elastic element one 3122 provides a larger lifting force, creating a dynamic balance. This design causes the submarine cable to exhibit a localized "shallow S-shaped" bend, optimizing tension acquisition and transmission stability.

[0035] When encountering small tension fluctuations, the submarine cable buffers the impact by lifting the lower pressure wheel 3131. When facing a sudden increase in tension, the submarine cable lifts the lower pressure wheel 3131, simultaneously exerting downward pressure on the top wheel 3121 and the movable frame 312. The movable frame 312 moves downward, forcing the pressure rod 3143 to press vertically downward. Through the locking coupling sleeve 3144 by the return spring 3146, the force is rigidly transmitted through rod two 3142 and rod one 3141. The downward pressure of the pressure rod 3143 is converted into an upward force at the end of rod one 3141 via a lever, thereby driving the coupling gear 316 to rotate. After being amplified by the 1:3 transmission between the small gear 3162 and the large gear 3161, the coupling rack 322 quickly adjusts the position of the coupling groove 323 of the sliding sleeve 321, ensuring that the anti-torsion frame responds promptly to tension changes.

[0036] When the tension exceeds the threshold, the pressure rod 3143 presses the second rod 3142 to its limit position. The inclined surface 3145 of the mating sleeve 3144 interferes with the top block 315, causing the sleeve to displace and expose the hinge point. The second rod 3142 bends, releasing the force transmission, and then the sliding sleeve 321 resets under the action of gravity. After the elastic element 3122 pushes the movable frame 312 back to its position, the second rod 3142 and the first rod 3141 return to their straight state, and the mating sleeve 3144 automatically resets.

[0037] The reset of the sliding sleeve 321 serves a dual purpose. Firstly, before reset, it is positioned close to the center of the cable reel, "pulling" the cable path to cope with sudden tension increases. Resetting returns it to its initial position, restoring the cable path and releasing the previously excessively taut cable length, thus reducing tension and directly decreasing the cable's overall strain. Secondly, the reset restores the untightening device 3 to its initial operating state. If the sliding sleeve 321 remains constantly positioned close to the center of the cable reel, subsequent fluctuations in cable tension could cause damage to the cable due to a lack of adjustment margin. After reset, the top wheel 3121 and the lower pressure wheel 3131 can re-buffer small tension fluctuations through the "upper pressure, lower support" structure. If tension increases suddenly again, the sliding sleeve 321 can be triggered again to move towards the center for adjustment. This cycle effectively prevents the cable from being under high tension for extended periods, indirectly ensuring that the tension remains stable within a safe range.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the telescopic rotating submarine cable untwisting frame and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A telescopic rotating submarine cable untwisting frame, comprising a fixed column (1), wherein a rotating arm (2) is rotatably connected to the top of the fixed column (1), characterized in that, The rotary arm (2) is provided with a torque-removing device (3) at one end. The torque-removing device (3) includes an adjustment mechanism (31) and a positioning adjustment frame (32) that slides with it. The adjustment mechanism (31) includes a fixed housing (311) fixedly mounted on the rotary arm (2), a movable frame (312) elastically slidably mounted on the fixed housing (311), symmetrical top wheels (3121) rotating at both ends of the movable frame (312), and an elastic element two (313) mounted on the fixed housing (311), with a downward pressure wheel (3131) rotating at the end of the elastic element two (313) and interleaved with the top wheel (3121). The bottom of the movable frame (312) is equipped with a transmission component (314), and a docking gear (316) rotates on one side of the fixed shell (311). When the torque is too large, the transmission component (314) drives the docking gear (316) to rotate. The alignment adjustment frame (32) includes a sliding sleeve (321) and a docking groove (323). A docking rack (322) that meshes with the docking gear (316) is fixed on the sliding sleeve (321). The submarine cable passes through the docking groove (323) and is offset by the top wheel (3121) and the lower pressure wheel (3131) to achieve S-shaped winding. When the tension is slight, the position of the submarine cable on the top wheel (3121) remains unchanged. When the tension is large, the movable frame (312) moves down and is driven by the transmission component (314) to make the docking gear (316) cooperate with the docking rack (322) to achieve the alignment adjustment frame (32) moving away from the adjustment mechanism (31).

2. The telescopic rotary submarine cable untwisting frame according to claim 1, characterized in that, The transmission component (314) includes a pressure rod (3143) fixedly connected to the center of the bottom of the movable frame (312). The bottom end of the pressure rod (3143) is hinged to a second rod (3142). The other end of the second rod (3142) is hinged to a first rod (3141) rotatably connected to the fixed shell (311). The end of the first rod (3141) away from the second rod (3142) is hinged to a drive rack (3147) slidably connected to the fixed shell (311).

3. The telescopic rotary submarine cable untwisting frame according to claim 2, characterized in that, A connecting sleeve (3144) is slidably connected to the outer wall of the connecting end of the first rod (3141) and the second rod (3142). A return spring (3146) with one end connected to the connecting sleeve (3144) is sleeved on the outer wall of the first rod (3141). An inclined surface (3145) is opened at the end of the connecting sleeve (3144) near the second rod (3142). A top block (315) is fixedly installed in the fixed shell (311) at the position below the inclined surface (3145).

4. The telescopic rotary submarine cable untwisting frame according to claim 1, characterized in that, The bottom of the fixed shell (311) is provided with a limiting groove (3111) that matches the drive rack (3147). The limiting groove (3111) is used to limit the sliding direction of the drive rack (3147).

5. The telescopic rotary submarine cable untwisting frame according to claim 1, characterized in that, The bottom of the movable frame (312) is provided with an elastic element (3122) between the fixed shell (311) and the elastic element (313). The downward pressure applied by the elastic element is less than the lifting force of the elastic element (3122).

6. The telescopic rotary submarine cable untwisting frame according to claim 1, characterized in that, The mating gear (316) includes a large gear (3161) rotatably connected to the fixed housing (311), and a small gear (3162) is fixedly connected inside the large gear (3161). The diameter of the large gear (3161) is at least three times the diameter of the small gear (3162).

7. The telescopic rotary submarine cable untwisting frame according to claim 6, characterized in that, The pinion (3162) meshes with the drive rack (3147), and the mating rack (322) meshes with the large gear (3161).

8. The telescopic rotary submarine cable untwisting frame according to claim 1, characterized in that, Both the top wheel (3121) and the bottom wheel (3131) are arc-shaped concave structures, symmetrically distributed along the axial direction, with large diameters at both ends and small diameters in the middle, and a smooth transition from the two ends to the middle through a curved surface.

Images