A dual drum adjustable speed cable laying and recovery winch and method of use

Abstract

This invention discloses a dual-drum adjustable-speed submarine cable laying and recovery winch and its usage method, including a base, a drum winch, a power system, and a clamping system. The base includes a working deck and a support frame. The working deck has circular holes and circular grooves. The support frame is mounted on the working deck. Rollers and cylindrical rollers are evenly distributed circumferentially within the circular grooves of both the working deck and the support frame. The drum winch includes an upper drum and a lower drum, which are rotatably connected in the circular grooves. The power system includes an upper motor and a lower motor, connected to both the upper and lower drums. The clamping system includes elastic clamps and electromagnet boxes. The elastic clamps are connected to the side walls of the upper and lower drums. Each elastic clamp has two electromagnet boxes at its end. This invention enables safe and efficient recovery of submarine cables, effectively protects the normal sections of the cable, and further saves space and cost.

Description

Technical Field

[0001] This invention relates to the field of submarine cable laying, recovery and maintenance in marine engineering, and in particular to a double-drum adjustable speed submarine cable laying and recovery winch and its usage method. Background Technology

[0002] In recent years, with the rapid expansion of offshore platforms and offshore wind power projects, the issue of submarine cable laying and retrieval has become increasingly prominent. Submarine cables, as a key component for power or signal transmission, are covered with insulating materials and laid on the seabed, and are mainly divided into submarine power cables and submarine communication cables.

[0003] Currently, the differences in diameter and laying / retrieval speeds of various submarine cables mean that cable laying vessels can only handle one type of cable at a time, thus limiting work efficiency. Existing submarine cable laying processes mainly adjust the laying tension and entry angle by regulating the speed of the laying vessel and the release speed of the cable, in order to avoid errors and damage caused by excessively small bending radii or excessive tension.

[0004] Submarine cables are often laid directly on the seabed, making them susceptible to seawater erosion and damage, thus posing high demands for their maintenance. In shallow waters, underwater repairs are typically carried out by divers and specialized diving equipment. However, in deep waters, due to harsh sea conditions, the difficulty and cost of underwater repairs increase significantly. Current repair methods primarily involve using amphibious trenching equipment to clear seabed sediment, excavating the damaged section of the cable, where divers conduct underwater inspections and secure it with slings. Then, a crane is used to lift the damaged section onto the construction vessel and fix it to the deck for repair. However, using a crane to lift the damaged section onto the construction vessel and fix it to the deck carries the risk of damaging the remaining cable sections and increases the complexity of handling the cable on the construction vessel. The storage of the remaining cable sections on the ship becomes a problem. Summary of the Invention

[0005] The technical problem this invention aims to solve is to address the shortcomings of the existing technology by providing a dual-drum adjustable-speed submarine cable laying and retrieval winch and its usage method. This winch is particularly suitable for laying and retrieving normal sections of submarine cables in deep-sea areas. By precisely controlling the winch's rotational speed, the winch effectively adjusts the cable laying speed, adapting to various complex construction processes such as direct casting, pre-laying followed by burial, and simultaneous laying and burial. This significantly improves laying efficiency and accuracy, enabling safe and efficient retrieval of submarine cables while effectively protecting normal sections, further saving space and cost, and meeting the requirements of the "Technical Specification for Submarine Cable Installation in Offshore Wind Farms" formulated by the China Quality Certification Center (CQC).

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A dual-drum adjustable-speed submarine cable laying and recovery winch includes a base, a drum winch, a power system, and a clamping system. The base includes a working deck and a support frame. The working deck is horizontally arranged and has circular holes and circular grooves concentric with the holes. The support frame is mounted on the working deck and also has circular holes and grooves. Rollers and cylindrical rollers are evenly distributed circumferentially within the circular grooves of both the working deck and the support frame. The rollers are connected to the inner wall of the circular groove, and the cylindrical rollers are fitted onto the outer side of the rollers. The drum winch... The disc includes an upper rotating drum and a lower rotating drum; the upper rotating drum is rotatably connected to a circular groove in the support frame, and the lower rotating drum is rotatably connected to a circular groove in the working deck; the power system includes an upper motor and a lower motor; the upper motor is installed at the bottom of the support frame and connected to the upper rotating drum; the lower motor is installed at the bottom of the working deck and connected to the lower rotating drum; the clamping system includes elastic clamps and electromagnet boxes; there are two elastic clamps, which are respectively connected to the side wall of the upper rotating drum and the side wall of the lower rotating drum; each elastic clamp is equipped with two electromagnet boxes at its end.

[0008] Preferably, it also includes an external frame, which comprises eight baffles, with four baffles evenly and vertically arranged along the circumference of the support frame and the working deck.

[0009] Preferably, a connecting column is connected to the inner wall of the lower rotating drum, and a drive shaft coaxial with the lower rotating drum is connected to the connecting column. The bottom of the drive shaft passes through a circular hole in the working deck and is connected to a first bevel gear. The output shaft of the lower motor is horizontally arranged and connected to a second bevel gear, which meshes with the first bevel gear. A connecting column is connected to the inner wall of the upper rotating drum, and a drive shaft coaxial with the upper rotating drum is connected to the connecting column. The bottom of the drive shaft passes through a circular hole in the support frame and is connected to a third bevel gear. The output shaft of the upper motor is horizontally arranged and connected to a fourth bevel gear, which meshes with the third bevel gear.

[0010] Preferably, the support frame has four support legs, and the tops of adjacent support legs are connected by multiple ribs.

[0011] Preferably, the elastic clamp has two square holes at the top and bottom, and the elastic clamp is made of spring steel.

[0012] Preferably, the electromagnet box includes small electromagnets and a battery. Several small electromagnets are located inside the electromagnet box, and the battery is connected to each small electromagnet through wires. A top switch is provided on the outside of the electromagnet box.

[0013] Preferably, both the upper and lower motors are connected to the support frame and the working deck respectively via motor support legs, and vibration dampers and rubber pads are installed in the motor support legs.

[0014] Preferably, both the upper and lower motors are DC motors, and the forward and reverse rotation of the motor output shaft is controlled by a relay or controller.

[0015] Preferably, the drive shaft of the lower drum is provided with a key at its bottom, and the first bevel gear has a keyway. The drive shaft of the lower drum is connected to the first bevel gear through the key and keyway engagement. The output shaft of the lower motor is provided with a key, and the second bevel gear has a keyway. The output shaft of the lower motor is connected to the second bevel gear through the key and keyway engagement. The drive shaft of the upper drum is provided with a key at its bottom, and the third bevel gear has a keyway. The drive shaft of the upper drum is connected to the third bevel gear through the key and keyway engagement. The output shaft of the upper motor is provided with a key, and the fourth bevel gear has a keyway. The output shaft of the upper motor is connected to the fourth bevel gear through the key and keyway engagement.

[0016] A method for using a dual-drum adjustable-speed submarine cable laying and recovery winch, characterized by the following steps:

[0017] The first step is to hoist the submarine cable to the vicinity of the elastic clamp: When laying or retrieving two types of submarine cables, one cable is hoisted by the crane on the laying vessel and lowered vertically to the position of the elastic clamp on the upper drum, while the other cable is lowered to the position of the elastic clamp on the lower drum. The second step is to clamp the submarine cable: First, close the electromagnet box. Workers insert the cable end into the elastic clamp, then open the electromagnet box, and the elastic clamp clamps the cable. The third step is to retrieve and lay the submarine cable: Set the speed of the upper and lower motors according to the cable specifications. When retrieving the cable, reverse the rotation of the upper and lower motors. When the normal section is collected, stop the rotation of the upper and lower motors to prepare for subsequent cable inspection and maintenance. When laying the cable, rotate the upper and lower motors forward. When the cable laying is complete, stop the rotation of the upper and lower motors.

[0018] The present invention has the following beneficial effects:

[0019] The flexible clamps allow for the gripping of submarine cables of different specifications. The electromagnet box further enhances the clamping force of the flexible clamps, enabling better cable holding and accommodating the laying and retrieval of submarine cables of various sizes. The upper and lower rotating drums, each driven by a motor, allow for the laying or retrieval of submarine cables at different or equal speeds.

[0020] The present invention has strong structural stability, is adaptable to high sea states in deep sea areas, is easy to manufacture, has many identical parts, is quick and easy to install and disassemble, and has a compact design that saves on deck area. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a dual-cylinder adjustable speed submarine cable laying and recovery winch according to the present invention.

[0022] Figure 2 This is a front view of a dual-cylinder adjustable-speed submarine cable laying and recovery winch according to the present invention.

[0023] Figure 3 This is a side view of a dual-cylinder adjustable-speed submarine cable laying and recovery winch according to the present invention.

[0024] Figure 4 This is a top view of a dual-cylinder adjustable-speed submarine cable laying and recovery winch according to the present invention.

[0025] Figure 5 This is a schematic diagram of the circular groove in this invention.

[0026] Figure 6 This is a schematic diagram of the circular hole and motor support leg in this invention.

[0027] Figure 7 This is a schematic diagram of the upper rotating cylinder in this invention.

[0028] Figure 8 This is a schematic diagram of the connection between the lower motor and the transmission shaft of the lower rotating drum in this invention.

[0029] Figure 9 This is a schematic diagram of the clamping system in this invention.

[0030] Figure 10 This is a schematic diagram of the electromagnet box in this invention.

[0031] Figure 11 This is a schematic diagram of the connection between the upper motor and the upper rotating drum of the present invention.

[0032] These include: 1. Base; 11. Working deck; 12. Support frame; 121. Support leg; 122. Rib; 13. Circular hole; 14. Circular groove; 15. Roller; 16. Cylindrical roller;

[0033] 2. Drum winch; 21. Upper drum; 211. Third bevel gear; 22. Lower drum; 221. First bevel gear; 23. Connecting column;

[0034] 3. Power system; 31. Upper motor; 311. Fourth bevel gear; 32. Lower motor; 321. Second bevel gear; 33. Motor support leg;

[0035] 4. Clamping system; 41. Flexible chuck; 42. Electromagnet box; 421. Small electromagnet; 422. Battery; 423. Top switch; 43. Support column;

[0036] 5. External frame; 51. Baffle. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0038] like Figures 1 to 11 As shown, a dual-drum adjustable speed submarine cable laying and recovery winch includes a base 1, a drum winch 2, a power system 3, a clamping system 4, and an external frame 5; all of the above are designed according to the ISO 4568: 2021 international standard.

[0039] The base 1 includes a working deck 11 and a support frame 12.

[0040] like Figure 5 As shown, the working deck 11 is horizontally arranged and has circular holes 13 with a diameter of approximately 10cm-20cm, as well as circular grooves 14 concentric with the circular holes 13. The grooves 14 have a depth of approximately 0.5cm, which complies with international ship design safety standards. The working deck 11 is a special deck on a cable-laying vessel, usually located in the middle or aft of the ship. It is specifically designed to house large equipment and machinery required for cable laying, such as laying vehicles, traction machines, slewing systems, winches, etc. It has a relatively thick thickness and structural strength to support the large working equipment.

[0041] like Figure 4 As shown, the support frame 12 is installed on the working deck 11, and the support frame 12 also has circular holes 13 and circular grooves 14. The support frame 12 is made of Q420 steel, which is a high-strength structural steel used to bear large loads. It is particularly suitable for equipment and pipelines that need to bear weight under large spans and high loads, as well as supports used in complex environments such as offshore. Figure 5 As shown, rollers 15 and cylindrical rollers 16 are evenly distributed circumferentially within the circular grooves 14 of the working deck 11 and the support frame 12. The rollers 15 are connected to the inner sidewall of the circular groove 14, and the cylindrical rollers 16 are sleeved on the outer side of the rollers 15. The rollers 15 and cylindrical rollers 16 are made of carbon steel, which has high hardness, high strength, and strong wear resistance, making it suitable for heavy-load industrial applications. In this invention, they are used to support the upper rotating drum 21 and the lower rotating drum 22. The support frame 12 has four support legs 121, and the tops of adjacent support legs 121 are connected by multiple ribs 122 to increase structural strength.

[0042] The drum winch 2 includes an upper drum 21 and a lower drum 22; the upper drum 21 and the lower drum 22 are arranged concentrically.

[0043] The upper rotating drum 21 is rotatably connected to the circular groove 14 of the support frame 12, and its bottom is tangent to the cylindrical roller 16. Several interconnected connecting columns 23 are welded to the inner wall of the upper rotating drum 21, preferably eight, to strengthen the structural strength of the upper rotating drum 21. The connecting columns 23 are connected to a drive shaft coaxial with the upper rotating drum 21, and the bottom of the drive shaft passes through the circular hole 13 of the support frame 12 and is connected to a third bevel gear 211. The lower rotating drum 22 is rotatably connected to the circular groove 14 of the working deck 11, and its bottom is tangent to the cylindrical roller 16. The lower rotating drum 22 has several interconnected connecting columns 23 welded to its inner wall, preferably eight columns. Each column connects to a drive shaft coaxial with the lower rotating drum 22. The bottom of the drive shaft passes through a circular hole 13 in the working deck 11 and connects to a first bevel gear 221. A key is provided at the bottom of the drive shaft, and the first bevel gear 221 and the third bevel gear 211 have keyways. The drive shaft connects to the corresponding bevel gears via the key and keyway. The key's main function is to transmit torque between the shaft and the bevel gears, preventing them from sliding relative to each other during rotation. It ensures effective transmission of rotational power and is a rectangular flat key. The drive shaft is made of 35CrMo steel, suitable for high-load, high-speed working environments. The upper rotating drum 21 and the lower rotating drum 22 are made of 80 steel, capable of withstanding large loads and high working strength.

[0044] The power system 3 includes an upper motor 31 and a lower motor 32. The upper motor 31 and the lower motor 32 are two identical DC motors with a wide speed range, good speed regulation performance, large starting torque and convenient control. The forward and reverse rotation of the motor output shaft is controlled by a relay or controller.

[0045] The upper motor 31 is mounted at the bottom of the support frame 12 and connected to the upper rotating drum 21. The output shaft of the upper motor 31 is horizontally arranged and connected to a fourth bevel gear 311, which meshes with a third bevel gear 211. The lower motor 32 is mounted at the bottom of the working deck 11 and connected to the lower rotating drum 22. The output shaft of the lower motor 32 is horizontally arranged and connected to a second bevel gear 321, which meshes with a first bevel gear 221. Both the upper motor 31 and the lower motor 32 have keys on their output shafts. The output shafts are made of carbon steel. The second bevel gear 321 and the fourth bevel gear 311 have keyways and center holes. The output shafts are connected to the corresponding bevel gears via keys and keyways.

[0046] Both the upper motor 31 and the lower motor 32 are connected to the support frame 12 and the working deck 11 respectively via four motor support legs 33. The four motor support legs 33 are screwed to the upper motor 31 and the support frame 12, and to the lower motor 32 and the working deck 11. The motor support legs 33 are made of carbon steel and are equipped with vibration dampers and rubber pads to reduce the impact of motor vibration on the surrounding environment and protect the motor itself. The motor support legs 33 are height-adjustable, allowing the motor height to be adjusted according to the installation site requirements. The bevel gears are made of alloy steel, with added alloying elements to improve their hardness, strength, and wear resistance, making them suitable for transmission devices in high-speed, heavy-load, or high-temperature environments. Alloy steel bevel gears have a long service life and stable transmission performance.

[0047] The clamping system 4 includes an elastic chuck 41 and an electromagnet box 42.

[0048] like Figure 9 and Figure 10 As shown, there are two elastic chucks 41, connected to the side walls of the upper rotating drum 21 and the lower rotating drum 22 respectively via support columns 43. The support columns 43 are made of aluminum alloy, featuring high strength, corrosion resistance, and electrical conductivity, suitable for light loads and high-frequency operations. The support columns 43 are connected to the corresponding rotating drum side walls by screws. Two square holes are provided at the top and bottom of each elastic chuck 41 to increase its ductility. The elastic chuck 41 is made of spring steel, possessing excellent elastic properties, capable of withstanding large elastic deformation without easily breaking. It has high strength and toughness, suitable for applications requiring frequent clamping and releasing. The elastic chuck 41 is connected to the support columns 43 by screws.

[0049] Each elastic clamp 41 has two electromagnet boxes 42 at its end. Each electromagnet box 42 includes a small electromagnet 421 and a battery 422. Several small electromagnets 421 are located inside the electromagnet box 42, and their internal iron cores are made of soft iron or silicon steel. The battery 422 is connected to each small electromagnet 421 via wires. A top switch 423 is located outside the electromagnet box 42, controlling the presence or absence of magnetism. The electromagnet box 42 is a device that generates electromagnetism when energized. A conductive winding matching the power of the small electromagnet 421 is wound around the iron core. This current-carrying coil has magnetism like a magnet, and is usually made in a circular or horseshoe shape to make the iron core easier to magnetize. Furthermore, to ensure that the small electromagnets 421 demagnetize immediately when the power is off, they are often made of soft iron or silicon steel, which demagnetizes quickly. Such small electromagnets 421 are magnetic when energized, and their magnetism disappears when the power is off.

[0050] like Figures 2 to 4As shown, the external frame 5 includes eight baffles 51, with four baffles 51 evenly and vertically arranged along the circumference of each of the support frame 12 and the working deck 11. The baffles 51 are made of galvanized steel, which is corrosion-resistant, durable, and easy to install. The galvanized layer effectively prevents the steel plate from rusting and extends its service life. The baffles 51 are designed to limit the footprint of the submarine cable. When the submarine cable is too long, the baffles 51 can restrict the cable from winding along the height direction on the upper drum 21 and the lower drum 22, preventing the submarine cable from occupying too much space on the working deck 11 or falling off the support frame 12.

[0051] The installation steps for this dual-drum adjustable-speed submarine cable laying and recovery winch are as follows:

[0052] The first step is to install the lower rotating drum 22 and the lower motor 32: a circular hole 13 with a diameter of 10-20cm is opened in the working deck 11. Then, taking the circular hole 13 as a reference, a concentric circular groove 14 is opened outward. The groove depth is about 0.5cm. The diameter of the circular groove 14 is expanded inward and outward by 0.1-0.2cm according to the diameter of the lower rotating drum 22. Rollers 15 and cylindrical rollers 16 are evenly laid in the circumference inside the circular groove 14.

[0053] Near the circular hole 13 below the working deck 11, connect four motor support legs 33 to the bottom of the working deck 11 according to the length of the output shaft of the lower motor 32, thereby installing the lower motor 32. The keyway of the second bevel gear 321 is keyed to the output shaft of the lower motor 32, and the keyway of the first bevel gear 221 is keyed to the rotating shaft of the lower drum 22. The lower drum 22 is placed on the circular groove 14 so that the bottom of the lower drum 22 is tangent to the cylindrical roller 16, so that the second bevel gear 321 on the output shaft of the lower motor 32 engages with the first bevel gear 221 on the rotating shaft of the lower drum 22.

[0054] The second step is to install the support frame 12: a circular hole 13 is made in the support frame 12, and a concentric circular groove 14 is made outward so that the upper and lower circular holes 13 are concentrically aligned. The four support legs 121 of the support frame 12 are fixedly installed on the working deck 11 with bolts. Rollers 15 and cylindrical rollers 16 are evenly laid in the circular groove 14 in a circular pattern.

[0055] The third step is to install the upper rotating drum 21 and the upper motor 31: Near the circular hole 13 below the support frame 12, connect the four motor support legs 33 to the lower part of the support frame 12 according to the length of the output shaft of the upper motor 31, thereby installing the upper motor 31. The keyway of the fourth bevel gear 311 is keyed with the output shaft of the upper motor 31, and the keyway of the third bevel gear 211 is keyed with the rotating shaft of the upper rotating drum 21. The upper rotating drum 21 is placed on the circular groove 14 so that the bottom of the upper rotating drum 21 is tangent to the cylindrical roller 16, so that the fourth bevel gear 311 on the output shaft of the upper motor 31 engages with the third bevel gear 211 on the rotating shaft of the upper rotating drum 21.

[0056] Fourth step, install clamping system 4: install clamping system 4 at the bottom of the side wall of the upper rotating drum 21 and the bottom of the side wall of the lower rotating drum 22. The clamping system 4 clamps the submarine cable.

[0057] Step 5, Install the baffles 51: Install the four baffles 51 evenly around the circumference on the working deck 11. Each baffle 51 is fixed to the working deck 11 at its bottom with screws. The diameter of the area enclosed by the four baffles 51 is determined by the work requirements, but the maximum diameter must not exceed the side length of the rectangle enclosed by the four support legs 121 of the support frame 12. Then, install the other four baffles 51 evenly around the circumference above the support frame 12. This completes the installation.

[0058] The method of using a dual-drum adjustable speed submarine cable laying and recovery winch is as follows:

[0059] The first step is to hoist the submarine cable to the vicinity of the elastic clamp 41: When laying or retrieving two types of submarine cables, one cable is hoisted by the crane on the laying vessel and lowered vertically to the position of the elastic clamp 41 on the upper rotating drum 21, while the other cable is lowered through the gap in the outermost rib 122 of the support frame 12 to the position of the elastic clamp 41 on the lower rotating drum 22. Workers can reach the vicinity of the elastic clamp 41 through the opening of the baffle 51.

[0060] The second step is to clamp the submarine cable: First, turn off the top switch 423 of the electromagnet box 42. The worker inserts the end of the submarine cable into the elastic clamp 41, and then turns on the top switch 423 of the electromagnet box 42. The elastic clamp 41 then clamps the submarine cable.

[0061] Step 3: Cable Retrieval and Laying: Workers retreat outside the barrier 51 and set the speeds of the upper and lower DC motors according to the cable specifications. When cable retrieval is needed, the DC motors are reversed; when the normal section is collected, the DC motors stop rotating to prepare for subsequent cable inspection and maintenance. When cable laying is needed, the DC motors are forward-rotating; when the cable laying is complete, the DC motors stop rotating.

[0062] Therefore, this invention is easy to install, allows for precise adjustment and control of the rotation speed, and features a controllable elastic clamp 41 size, adaptable to various specifications of submarine cables. It also allows for simultaneous installation of two submarine cables, significantly improving work efficiency. The invention provides a wide field of vision, enabling workers to observe the cable status in real time during winch operation. It not only lays cables but also retrieves and secures them, effectively solving the challenges of laying, retrieving, and maintaining submarine cables in deep-sea areas.

[0063] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A dual-drum adjustable-speed submarine cable laying and recovery winch, characterized in that: It includes a base (1), a cylindrical winch (2), a power system (3), and a clamping system (4); The base (1) includes a working deck (11) and a support frame (12); The working deck (11) is horizontally arranged and has circular holes (13) and circular grooves (14) concentric with the circular holes (13); The support frame (12) is set on the working deck (11), and the support frame (12) is also provided with circular holes (13) and circular grooves (14); rollers (15) and cylindrical rollers (16) are evenly distributed in the circular grooves (14) of the working deck (11) and the support frame (12). The rollers (15) are connected to the inner side wall of the circular grooves (14), and the cylindrical rollers (16) are sleeved on the outer side of the rollers (15). The drum winch (2) includes an upper drum (21) and a lower drum (22); The upper rotating cylinder (21) is rotatably connected to the circular groove (14) of the support frame (12), and the lower rotating cylinder (22) is rotatably connected to the circular groove (14) of the working deck (11); The power system (3) includes an upper motor (31) and a lower motor (32); The upper motor (31) is installed at the bottom of the support frame (12) and connected to the upper rotating drum (21); The lower motor (32) is installed at the bottom of the working deck (11) and connected to the lower rotating drum (22); The clamping system (4) includes a flexible chuck (41) and an electromagnet box (42); There are two elastic chucks (41), which are respectively connected to the side wall of the upper rotating drum (21) and the side wall of the lower rotating drum (22); Each elastic clamp (41) is provided with two electromagnet boxes (42) at its end; two square holes are opened at the top and bottom of the elastic clamp (41); the elastic clamp (41) is made of spring steel. The electromagnet box (42) includes a small electromagnet (421) and a battery (422). Several small electromagnets (421) are located inside the electromagnet box (42). The battery (422) is connected to each small electromagnet (421) through wires. A top switch (423) is provided outside the electromagnet box (42).

2. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 1, characterized in that: It also includes an external frame (5), which includes eight baffles (51), a support frame (12), and four baffles (51) are evenly and vertically arranged along the circumference on the working deck (11).

3. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 1, characterized in that: A connecting column (23) is connected to the inner wall of the lower rotating drum (22). The connecting column (23) is connected to a drive shaft coaxial with the lower rotating drum (22). The bottom of the drive shaft passes through a circular hole (13) in the working deck (11) and is connected to a first bevel gear (221). The output shaft of the lower motor (32) is horizontally arranged and connected to a second bevel gear (321). The second bevel gear (321) meshes with the first bevel gear (221). The inner wall of the upper rotating drum (21) is connected to a connecting column (23), and the connecting column (23) is connected to a drive shaft coaxial with the upper rotating drum (21). The bottom of the drive shaft passes through the circular hole (13) of the support frame (12) and is connected to a third bevel gear (211). The output shaft of the upper motor (31) is horizontally arranged and connected to a fourth bevel gear (311). The fourth bevel gear (311) meshes with the third bevel gear (211).

4. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 1, characterized in that: The support frame (12) has four support legs (121), and the tops of adjacent support legs (121) are connected by multiple ribs (122).

5. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 1, characterized in that: The upper motor (31) and the lower motor (32) are connected to the support frame (12) and the working deck (11) respectively through motor support legs (33). Vibration dampers and rubber pads are installed in the motor support legs (33).

6. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 1, characterized in that: Both the upper motor (31) and the lower motor (32) are DC motors, and the forward and reverse rotation of the motor output shaft is controlled by a relay or controller.

7. The dual-drum adjustable speed submarine cable laying and recovery winch according to claim 3, characterized in that: The lower rotating drum (22) has a key at the bottom of its drive shaft, and the first bevel gear (221) has a keyway. The drive shaft of the lower rotating drum (22) is connected to the first bevel gear (221) through the key and keyway. The output shaft of the lower motor (32) has a key, and the second bevel gear (321) has a keyway. The output shaft of the lower motor (32) is connected to the second bevel gear (321) through the key and keyway. The upper rotating drum (21) has a key at the bottom of its drive shaft, and the third bevel gear (211) has a keyway. The drive shaft of the upper rotating drum (21) is connected to the third bevel gear (211) through the key and keyway. The output shaft of the upper motor (31) has a key, and the fourth bevel gear (311) has a keyway. The output shaft of the upper motor (31) is connected to the fourth bevel gear (311) through the key and keyway.

8. A method of using the dual-drum adjustable speed submarine cable laying and recovery winch as described in claim 1, characterized in that: Includes the following steps: The first step is to hoist the submarine cable to the vicinity of the elastic clamp (41): When it is necessary to lay or retrieve two types of submarine cables, one of the submarine cables is hoisted by the crane on the laying ship and lowered vertically to the position of the elastic clamp (41) of the upper drum (21), and the other cable is lowered to the position of the elastic clamp (41) of the lower drum (22). The second step is to clamp the submarine cable: First, close the electromagnet box (42), and the staff insert the end of the submarine cable into the elastic clamp (41). Then, open the electromagnet box (42) and the elastic clamp (41) will clamp the submarine cable. Step 3: Retrieve and lay submarine cable: Set the speed of the upper motor (31) and the lower motor (32) according to the specifications of the submarine cable. When it is necessary to retrieve the submarine cable, reverse the rotation of the upper motor (31) and the lower motor (32). When the normal section is collected, stop the rotation of the upper motor (31) and the lower motor (32) to prepare for the subsequent submarine cable inspection and maintenance. When it is necessary to lay the submarine cable, rotate the upper motor (31) and the lower motor (32) forward. When the submarine cable is laid, stop the rotation of the upper motor (31) and the lower motor (32).

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