An A-shaped frame device for submarine cable laying, plowing, laying and recovering operations

Abstract

The present invention relates to an A-frame device for laying and recovering a submarine cable laying plow. The A-frame device includes an A-frame body, a variable amplitude oil cylinder, a transverse roller, and a buffer frame. The A-frame body is a gantry structure, including a crossbeam and a four-link structure, with the crossbeam mounted on top of two four-link structures. The two ends of the variable amplitude oil cylinder are respectively hinged to the upper and lower parts of the four-link structure. The variable amplitude oil cylinder drives the hinge point of the four-link structure to move, thereby driving the A-frame body to perform a variable amplitude operation. The transverse roller is mounted on the crossbeam and can move laterally along the crossbeam. The buffer frame is hinged to the transverse roller. After the cable passes around the transverse roller, it passes through the buffer frame and is connected to the laying plow. The buffer frame is used to position the laying plow during lifting and to achieve a sway-stopping function during the laying and recovery operation. The present invention has a wide variable amplitude capability and the functions of guiding and stopping the laying plow during retraction and towing. It provides a guarantee for cable laying operations under complex sea conditions and facilitates equipment maintenance at sea.

Description

Technical Field

[0001] The present invention relates to an A-shaped frame hoisting device, in particular to an A-shaped frame device used for submarine cable laying, plowing, laying and recovering operations. Background Art

[0002] In recent years, driven by the needs of the global economy, especially emerging markets and developing economies, international demand for submarine cable construction has shown rapid growth, and the demand for submarine cable laying has gradually increased. The retraction and towing mechanism of the laying plow within the cable-laying equipment is a critical component in the laying / burying of submarine cables and electrical cables on the seabed. Large plows, due to their large dimensions, heavy weight, and complex sea conditions, require a large outboard working span (i.e., the distance from the outboard lifting point to the leg hinge point) to prevent collisions between the plow and the vessel / gantry during operation. Furthermore, manual traction is often required during the retraction and deployment process to prevent the equipment from swinging.

[0003] At present, a gantry lifting system is used in construction, such as those described in patents CN204980866U, CN108839758A, and CN211618000U. A hydraulic cylinder is used to drive the gantry legs to a predetermined operating position, and a winch is used to perform the lifting operation. The amplitude variation angle range is usually within 100° (i.e., the outboard amplitude variation angle generally does not exceed 60°, and the inboard amplitude variation angle generally does not exceed 40°). A lifting point pulley is set at the lower part of the gantry beam for cable guidance. Some gantry systems (such as CN204980866U) are also provided with a stabilizer frame pulled by a winch to achieve the lateral anti-sway function of the buried plow. In order to achieve a larger working span, the above-mentioned gantry is usually very high as a whole, which brings many adverse effects to the cable-laying vessel, such as increased equipment weight, increased overall center of gravity of the ship, and reduced ship maneuverability. At the same time, the crossbeam adopts a pulley type with a hanging point. Considering the large size of the pulley itself, the effective lifting net height of the gantry is reduced. After the buried plow is lifted, during the gantry boom lengthening process, although the stabilizer frame adjusted by the winch can achieve lateral limit swinging, it cannot provide longitudinal anti-swing capability, and there is still a risk of equipment retraction and deployment under high sea conditions. In the above-mentioned gantry retraction and deployment system, due to the limited boom lengthening range of the gantry, the gantry cannot be stored close to the deck inside the ship, and there is a certain risk in the maintenance and repair of the offshore gantry. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides an A-shaped frame device for submarine cable laying and recovery operations of a submarine cable burying plow, which is used for submarine optical cable / electric cable burying and maintenance operations, and has the functions of burying plow retraction and towing guidance and anti-swaying. Combined with the design of large-angle range amplitude adjustment capability, long-distance transverse roller and foldable anti-swaying guide frame, it can realize the integrated common guidance of burying plow retraction and towing, and stable anti-swaying during the amplitude adjustment process, providing a guarantee for cable laying construction operations under complex sea conditions, and at the same time facilitating equipment offshore maintenance, which has great engineering significance for improving my country's submarine cable laying efficiency and construction capabilities.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0006] An A-frame device for submarine cable laying and ploughing operations, comprising an A-frame body, a variable amplitude oil cylinder, a transverse roller, and a buffer frame;

[0007] The A-frame body is a gantry structure, including a crossbeam and a four-link structure, and the crossbeam is installed on the top of the two four-link structures; the two ends of the boom cylinder are respectively hinged to the upper and lower parts of the four-link structure, and the boom cylinder drives the hinge point of the four-link structure to move, thereby driving the A-frame body to perform a boom operation; the transverse roller is installed on the crossbeam and can move laterally along the crossbeam; the buffer frame is hinged to the transverse roller, and the cable passes through the buffer frame after passing through the transverse roller and is connected to the burying plow. The buffer frame is used for positioning the burying plow during lifting and for realizing the anti-sway function during the laying and recovery operation.

[0008] Furthermore, the four-bar linkage structure includes an inclined arm, a connecting rod, a support leg and a base; the two ends of the crossbeam are respectively mounted on the top of the two support legs; the bottom ends of the support legs are hingedly mounted on the center above the base, and the two bases are respectively mounted on the hull deck; the bottom end of the inclined arm is hingedly mounted on the base, and the upper part of the inclined arm is connected to the lower part of the support leg through the connecting rod;

[0009] The luffing oil cylinder is hingedly connected to the top end of the tilting boom, and the cylinder output rod of the luffing oil cylinder is hingedly connected to the upper part of the support leg.

[0010] Furthermore, both sides of the upper portion of the tilting arm are symmetrically connected to both sides of the bottom portion of the support leg through the connecting rods.

[0011] Furthermore, the transverse moving roller includes a transverse moving device, a roller and a transverse moving cylinder; the roller is connected to the beam through the transverse moving device; the transverse moving cylinder is installed on one side of the upper surface of the beam, the output rod of the transverse moving cylinder is connected to the transverse moving device, and the transverse moving cylinder drives the transverse moving roller to move laterally through the transverse moving device.

[0012] Furthermore, the transverse roller also includes a pad and slider assembly, and multiple pads in the pad and slider assembly are arranged in the middle of the beam and on the surface of the other side of the beam opposite to the transverse cylinder. Multiple sliders in the pad and slider assembly are distributed on the inner side of the transverse device, and the sliders are connected to the pads.

[0013] Furthermore, the drum includes an auxiliary annular bracket and a rope groove, and two auxiliary annular brackets are symmetrically arranged on both sides of the rope groove.

[0014] Furthermore, the lateral movement oil cylinder is a double-acting hydraulic oil cylinder, and a two-way balancing valve group is provided next to the lateral movement oil cylinder. The lateral movement oil cylinder realizes a self-locking holding function through the two-way balancing valve group.

[0015] Furthermore, the buffer frame is a foldable anti-sway guide frame.

[0016] Furthermore, the buffer frame includes a first anti-sway hydraulic cylinder, a second anti-sway hydraulic cylinder, a third anti-sway hydraulic cylinder, a fourth anti-sway hydraulic cylinder, a fairlead assembly, a first support arm and a second support arm;

[0017] The two first support arms are symmetrically hingedly installed on both sides of the transverse roller, and the two first support arms are respectively hingedly connected to the second support arms; the second support arms are L-shaped; the two ends of the fairlead assembly are respectively connected to the inner sides of the two second support arms;

[0018] The first anti-swing hydraulic cylinder and the second anti-swing hydraulic cylinder are symmetrically installed on both sides of the transverse roller, and the output rod ends of the corresponding hydraulic cylinders are respectively connected to the upper part of the first support arm on the same side; the third anti-swing hydraulic cylinder and the fourth anti-swing hydraulic cylinder are symmetrically installed on the lower part of the second support arm, and the output rod ends of the corresponding hydraulic cylinders are respectively connected to the lower part of the first support arm on the same side.

[0019] Furthermore, the fairlead assembly includes a nylon fairlead and a connector, two ends of the two nylon fairleads are connected via the connector, and the center of the connector is mounted on the inner side of the lower portion of the second support arm via a pin.

[0020] Beneficial effects of the present invention:

[0021] The A-shaped frame device provided by the present invention for submarine cable laying and ploughing operations has a wide amplitude adjustment capability and the functions of ploughing retraction and deployment, towing guidance, and anti-swaying. It provides a guarantee for cable laying operations under complex sea conditions, and is convenient for offshore repair and maintenance of equipment. It has great engineering significance for improving the efficiency and construction capacity of my country's submarine cable laying operations.

[0022] The A-frame of the present invention utilizes a luffing cylinder to drive the hinge points of a four-bar linkage structure, enabling the gantry to be luffed. This four-bar linkage structure provides the gantry with wide luffing capabilities. The larger outboard working span ensures that the plow can be placed as far from the stern as possible during outboard operations, reducing collision risks. At the same time, when stowed inboard, the plow can be kept as close to the deck as possible, improving the safety and convenience of equipment maintenance. Furthermore, while achieving wide luffing capabilities, the gantry of the present invention also effectively controls its overall height, reducing structural weight and contributing to improved seakeeping performance during vessel operations.

[0023] The present invention utilizes a transverse movement device to realize heavy-load and long-distance transverse movement of the drum. The drum adopts a structure in which auxiliary annular brackets are extended from the rope groove to both sides, which is beneficial to the safe guidance of the main hoisting cable and the two leader cables during the burying plow retraction and towing operations.

[0024] The present invention combines the wide-angle amplitude adjustment capability of the gantry inboard with the guiding function of the roller, and can realize the gantry inboard guided burying plough towing operation, providing guarantee for supporting the burying plough to carry out seabed burying and laying operations for a long time.

[0025] The buffer frame, located beneath the traverse mechanism, is a foldable, anti-sway guide frame that provides a buffer for docking with the burying plow without reducing the clear lifting height. Two nylon fairleads at the bottom of the buffer frame effectively limit the swing of the figure-eight cable at the connection between the burying plow and the hoisting device, ensuring safe guidance of the burying plow. The buffer frame, through the damping action of four anti-sway hydraulic cylinders, maintains the vertical position of the submarine cable and prevents the burying plow from swinging longitudinally and transversely. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the composition of the A-frame device used for submarine cable laying, plowing, laying and recovering operations according to the present invention;

[0027] Figure 2 Schematic diagram of the structure of the transverse moving device and the buffer frame in the present invention;

[0028] Figure 3 This is a schematic diagram of the working state of the A-frame device used for submarine cable laying and recovery operations by the present invention.

[0029] Among them: 1-A-shaped frame body, 1.1-crossbeam, 1.2-tilt arm, 1.3-connecting rod, 1.4-support leg, 1.5-base, 2-boom cylinder, 3-transverse roller, 3.1-transverse device, 3.2-roller, 3.3-pad and slider assembly, 3.4-transverse cylinder, 4-buffer frame, 4.1-first anti-swing hydraulic cylinder, 4.2-second anti-swing hydraulic cylinder, 4.3-third anti-swing hydraulic cylinder, 4.4-fourth anti-swing hydraulic cylinder, 4.5-nylon fairlead, 4.6-first support arm 4.6, 4.7-second support arm, 4.8-connecting beam, 4.9-reinforcement rib. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] The terms "up", "down", "left", "right", "front", and "back" in this application are based on the positional relationships shown in the accompanying drawings. The corresponding positional relationships may vary depending on the drawings, and should not be construed as limiting the scope of protection.

[0032] In the present invention, the terms "installed," "connected," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, or mutual communication. They may be directly connected or indirectly connected through an intermediate medium. They may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] This embodiment describes an A-shaped frame device for submarine cable laying and recovery operations using a submarine cable laying and recovery plow. It is used as a submarine cable laying and recovery device in the field of shipbuilding and marine engineering, facilitating the laying and maintenance of submarine optical cables / electric cables, and has the functions of laying and retracting the laying plow, towing guidance, and anti-swaying.

[0034] like Figure 1 and Figure 3 As shown, the A-frame device includes an A-frame body 1, a boom cylinder 2, a transverse roller 3, and a buffer frame 4. The A-frame body 1 is the main structural bearing component of the A-frame device, providing load support during the deployment and recovery of the burying plow, and providing a towing cable guidance function and load support during the burying plow towing operation. The two ends of the boom cylinder 2 are respectively hinged to the upper and lower parts of the A-frame body 1 through a pin shaft, which is used to support the boom operation of the A-frame body 1, thereby realizing the deployment operation of the burying plow from the inner deck to the outer deck, and the recovery operation from the seabed to the ship. The transverse roller 3 is located on the crossbeam 1.1 at the top of the A-frame body 1, and is used for cable guidance and transverse load after being loaded, so as to adjust the load to the appropriate working position. The buffer frame 4 is hinged to the transverse roller 3 through a pin shaft, and is used for positioning the burying plow during lifting, and realizing the anti-sway function during the deployment and recovery operation.

[0035] Specifically, the A-frame body 1 is a portal structure, mainly composed of a crossbeam 1.1, an inclined arm 1.2, a connecting rod 1.3, a support leg 1.4 and a base 1.5.

[0036] In this embodiment, the crossbeam 1.1, two legs 1.4, and two bases 1.5 form the main body of the portal frame. The crossbeam 1.1 and legs 1.4 are the main load-bearing components for retracting and deploying the buried plow, and both adopt a box-type structure. The bottom surfaces of the two ends of the crossbeam 1.1 are respectively fixed to the tops of the two legs 1.4. The fixing method can be flange and bolt fixing, which is easy to disassemble. For example, flanges are respectively provided on the bottom sides of the two ends of the crossbeam 1.1, and then the legs 1.4 and flanges are connected by bolts. The two bases 1.5 are respectively installed on the hull deck using high-strength bolts, and two mounting plates are symmetrically provided on the upper part of the base 1.5, with a mounting groove provided between the two mounting plates. The bottom ends of the two legs 1.4 are respectively hingedly connected to the middle position of the mounting groove of the base 1.5 via spherical bearings. The bottom end of the tilting arm 1.2 is hingedly connected to one side of the mounting groove of the base 1.5 via spherical bearings, and the two tilting arms 1.2 are located on the same side of the mounting groove of the two bases 1.5. The upper sides of the tilting boom 1.2 are symmetrically connected to the lower sides of the outriggers 1.4 via connecting rods 1.3. A luffing cylinder 2 is hingedly connected to the top of the tilting boom 1.2, and the top of the cylinder's output rod is hingedly connected to the upper part of the outriggers 1.4. Driven by the luffing cylinder 2, the outriggers 1.4 and tilting boom 1.2 can rotate relative to the base 1.5 around their respective spherical bearings, thereby changing the position of the gantry relative to the ship's deck.

[0037] The gantry of this embodiment is different from the general gantry in that the gantry's luffing movement is driven by a stable triangular mechanism consisting of a cylinder, a leg, and a base. In this embodiment, a four-bar structure is formed by a tilting arm 1.2, a connecting rod 1.3, a leg 1.4, and a base 1.5. The luffing cylinder 2 drives the hinge point of the four-bar structure to move, while ensuring the safe working load of the gantry remains unchanged, the wide-angle luffing operation of the gantry and the inboard storage and maintenance capabilities are realized.

[0038] Furthermore, the top of the leg 1.4 is an inverted trapezoidal structure, increasing the support area for the crossbeam 1.1 and strengthening the load capacity of the leg 1.4. The upper portion of the mounting plate used on the base 1.5 is triangular in shape, which prevents the mounting plate from increasing rotational resistance when the leg 1.4 and tilt arm 1.2 rotate.

[0039] The transverse movement roller 3 comprises a transverse movement device 3.1, a roller 3-2, a pad and slider assembly 3.3 and a transverse movement cylinder 3.4.

[0040] Among them, initially, the roller 3.2 is connected to the center position of the beam 1.1 through the transverse device 3.1, and the inner shape of the transverse device 3.1 matches the beam 1.1. The transverse cylinder 3.4 is installed on one side of the upper surface of the beam 1.1, and its output rod is connected to the transverse device 3.1. The transverse cylinder 3.4 drives the transverse roller 3 to move laterally through the transverse device 3.1. The multiple pads in the pad and slider assembly 3.3 are arranged on the edges of the upper, lower, front and rear surfaces of the middle part of the beam 1.1 and the other side opposite to the transverse cylinder 3.4 (i.e., from the middle of the beam 1.1 to the maximum limit position of the transverse stroke of the transverse device 3.1), forming the slide rail of the transverse device 3.1. The multiple sliders in the pad and slider assembly 3.3 are evenly distributed on the inner side of the transverse device 3.1, and the sliders are connected to the pads. Under the push-pull action of the traverse cylinder 3.4, the traverse device 3.1 and roller 3.2 slide together along the slide rails, enabling the traverse roller 3 to move left and right along the crossbeam 1.1 when loaded, enabling position switching under different operating conditions of the buried plow, thus enabling the A-frame device to perform heavy-load, long-distance traverse operations. Preferably, the length of the slide rails matches the travel range of the traverse cylinder 3.4 to ensure that the roller 3.2 is always within the travel range of the traverse cylinder 3.4, achieving maximum sliding travel.

[0041] Furthermore, the traverse device 3.1 is as follows Figure 2 As shown, the transverse moving device 3.1 is a box-type structure, with a circular vertical rib plate welded in the middle of the box-type structure, and several transverse and vertical rib plates are connected to both sides and the middle of the transverse moving device 3.1 to ensure the strength of the overall structure of the transverse moving device 3.1.

[0042] Drum 3.2 includes an auxiliary annular bracket and a rope groove, with two auxiliary annular brackets symmetrically arranged on either side of the rope groove. This structural design of drum 3.2 facilitates supporting the main hoist cable and two jib cables during the retrieval of the buried plow, ensuring that the cables pass between the two nylon fairleads 4.5 on the buffer frame 4, cooperating with the buffer frame 4 to prevent swing during the deployment and retrieval of the buried plow. The traverse cylinder 3.4 is a double-acting hydraulic cylinder that pushes and pulls the traverse device 3.1. A two-way balancing valve group is installed next to the traverse cylinder 3.4, which provides a self-locking retention function to ensure that drum 3.2 operates in the designated position.

[0043] The buffer frame 4 of this embodiment is a foldable anti-sway guide frame, which is arranged below the transverse movement device 3.1 and is used for docking and buffering with the burying plow.

[0044] like Figure 1 and Figure 2 As shown, the buffer frame 4 includes a first anti-swing hydraulic cylinder 4.1, a second anti-swing hydraulic cylinder 4.2, a third anti-swing hydraulic cylinder 4.3, a fourth anti-swing hydraulic cylinder 4.4, a nylon fairlead 4.5, a first support arm 4.6, a second support arm 4.7, a connecting beam 4.8 and a reinforcing rib 4.9.

[0045] At the top of the buffer frame 4, the first and second anti-sway hydraulic cylinders 4.1 and 4.2 are symmetrically hinged on either side of the traverse mechanism 3.1. The ends of their respective output rods are hingedly connected to the upper portion of the first support arm 4.6 on the same side. At the bottom of the buffer frame 4, the third and fourth anti-sway hydraulic cylinders 4.3 and 4.4 are symmetrically hingedly connected to the lower portion of the second support arm 4.7. The ends of their respective output rods are hingedly connected to the lower portion of the first support arm 4.6 on the same side.

[0046] The tops of the two first support arms 4.6 are symmetrically hinged to either side of the transverse movement device 3.1 via pins. The bottoms of the two first support arms 4.6 are hinged to the second support arms 4.7, respectively. The lower portions of the two first support arms 4.6 are connected by a connecting beam 4.8. Two reinforcing ribs 4.9 cross-connect between the two first support arms 4.6 and the connecting beam 4.8 to ensure the structural strength of the buffer frame 4. The second support arms 4.7 are L-shaped, with the corners of the two second support arms 4.7 connected by connecting beams 4.8. The two nylon fairleads 4.5 are connected at both ends by connectors to form a fairlead assembly. The centers of the connectors on either side can be mounted on the inner side of the lower portion of the second support arm 4.7 via pins or mounted in guide grooves within the lower portion of the second support arm 4.7 via pins. The fairlead assembly can be adjusted along the guide grooves. The two nylon fairleads 4.5 serve as position limits for the submarine cable passing through the middle of the fairlead assembly. During lifting and operation, the steel cable joint connected to the laying plough for deployment, recovery and towing operations is located between the two nylon fairleads 4.5, which can achieve lateral buffering and anti-swing.

[0047] In this embodiment, the buffer frame 4 comprises a first anti-sway hydraulic cylinder 4.1 and a second anti-sway hydraulic cylinder 4.2, which operate synchronously as the first hydraulic cylinder group. The third anti-sway hydraulic cylinder 4.3 and the fourth anti-sway hydraulic cylinder 4.4, which operate synchronously as the second hydraulic cylinder group. These two hydraulic cylinder groups utilize their damping function to provide the buffer frame 4 with a passive damping and anti-sway function. This means that during mast luffing, the buffer frame 4 passively follows the mast's movement under the weight of the plough. The damping action of the hydraulic cylinders maintains the submarine cable's vertical position as much as possible, minimizing longitudinal oscillations caused by vessel motion.

[0048] The driving modes of the two sets of hydraulic cylinders are divided into active posture adjustment mode and floating mode, which can be selected according to the actual working conditions. In the active posture adjustment mode, the extension length of the two sets of hydraulic cylinders can be actively adjusted as needed to achieve longitudinal anti-swing during the deployment and recovery operations of the burying plow at different angles of the gantry. In the floating mode, the anti-swing hydraulic cylinder on the buffer frame 4 realizes the connection between the hydraulic cylinder A and B oil ports under the control of the electromagnetic switch valve, thereby achieving the floating function of the buffer frame 4. That is, during the deployment and recovery of the burying plow, the buffer frame 4 can passively follow the movement of the gantry, try to keep the burying plow in a vertical state under its own weight, and increase the damping of the corresponding hydraulic cylinder according to the actual situation to resist the longitudinal swing caused by external loads such as wind load.

[0049] In this embodiment, the boom cylinder 2, the traverse cylinder 3.4, the first anti-swing hydraulic cylinder 4.1, the second anti-swing hydraulic cylinder 4.2, the third anti-swing hydraulic cylinder 4.3, the fourth anti-swing hydraulic cylinder 4.4, the two-way balancing valve group and the electromagnetic switch valve of the anti-swing hydraulic cylinder are respectively connected to the control system of the A-frame device. Under the control of the control system, the operation of the A-frame device is more convenient.

[0050] When the A-frame device of this embodiment is in use, the cable extending from the winch passes through the rope groove on the drum 3.2 and then passes downward between the two nylon fairleads 4.5 to connect with the towing cable of the buried plow or other submarine cables. Figure 3 As shown, when the mast is at 80° inboard, the A-frame is stowed or guided, and both hydraulic cylinders of the buffer frame 4 are retracted to their shortest stroke, providing sway control and buffering for the towing cable. This position is suitable for A-frame maintenance or towing operations for a buried plow. When the mast is at 70° outboard, the buried plow is deployed and retrieved. Normal load-carrying operations are possible between 70° outboard and 50° inboard. When the mast is at 80° inboard, it can be used for maintenance, stowage, and guidance.

[0051] Although the principles of the present invention have been described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute a limitation on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple substitutions based on the technical solution of the present invention fall within the scope of protection of the present invention.

Claims

1. An A-frame device for submarine cable laying and ploughing operations, characterized in that: The A-frame device comprises an A-frame body (1), an amplitude-changing oil cylinder (2), a transverse roller (3) and a buffer frame (4); The A-frame body (1) is a gantry structure, comprising a crossbeam (1.1) and a four-link structure, wherein the crossbeam (1.1) is mounted on the top of two four-link structures; the two ends of the amplitude-changing oil cylinder (2) are respectively hinged to the upper and lower parts of the four-link structure, and the amplitude-changing oil cylinder (2) drives the hinge point of the four-link structure to move, thereby driving the A-frame body (1) to perform an amplitude-changing operation; the transverse roller (3) is mounted on the crossbeam (1.1) and can move transversely along the crossbeam (1.1); the buffer frame (4) is hinged to the transverse roller (3), and the cable passes through the buffer frame (4) after passing through the transverse roller (3) and is connected to the burying plow, and the buffer frame (4) is used for positioning the burying plow when it is lifted and for realizing the anti-sway function during the laying and recovery operation process; The buffer frame (4) is a foldable anti-sway guide frame, comprising a first anti-sway hydraulic cylinder (4.1), a second anti-sway hydraulic cylinder (4.2), a third anti-sway hydraulic cylinder (4.3), a fourth anti-sway hydraulic cylinder (4.4), a fairlead assembly, a first support arm (4.6), and a second support arm (4.7); The two first support arms (4.6) are symmetrically hingedly mounted on both sides of the transverse roller (3), and the two first support arms (4.6) are respectively hingedly connected to the second support arms (4.7); the second support arms (4.7) are L-shaped; and the two ends of the fairlead assembly are respectively connected to the inner sides of the two second support arms (4.7); The first anti-sway hydraulic cylinder (4.1) and the second anti-sway hydraulic cylinder (4.2) are symmetrically installed on both sides of the transverse roller (3), and the output rod ends of the corresponding hydraulic cylinders are respectively connected to the upper part of the first support arm (4.6) on the same side; the third anti-sway hydraulic cylinder (4.3) and the fourth anti-sway hydraulic cylinder (4.4) are symmetrically installed on the lower part of the second support arm (4.7), and the output rod ends of the corresponding hydraulic cylinders are respectively connected to the lower part of the first support arm (4.6) on the same side; The fairlead assembly comprises a nylon fairlead (4.5) and a connecting piece. The two ends of the two nylon fairleads (4.5) are connected via the connecting piece. The center of the connecting piece is mounted on the inner side of the lower part of the second support arm (4.7) via a pin.

2. The A-frame device for submarine cable laying and recovery operations according to claim 1, characterized in that: The four-link structure comprises an inclined arm (1.2), a connecting rod (1.3), a supporting leg (1.4) and a base (1.5); the two ends of the crossbeam (1.1) are respectively mounted on the top ends of the two supporting legs (1.4); the bottom ends of the supporting legs (1.4) are hingedly mounted on the center above the base (1.5), and the two bases (1.5) are respectively mounted on the hull deck; the bottom end of the inclined arm (1.2) is hingedly mounted on the base (1.5), and the upper part of the inclined arm (1.2) is connected to the lower part of the supporting leg 1.4 through the connecting rod (1.3); The luffing oil cylinder (2) is hingedly connected to the top end of the tilting arm (1.2), and the oil cylinder output rod of the luffing oil cylinder (2) is hingedly connected to the upper part of the support leg (1.4).

3. The A-frame device for submarine cable laying and recovery operations according to claim 2, characterized in that: Both sides of the upper portion of the tilting arm (1.2) are symmetrically connected to both sides of the bottom portion of the supporting leg (1.4) via the connecting rod (1.3).

4. The A-frame device for submarine cable laying and recovery operations according to claim 1, characterized in that: The transverse roller (3) comprises a transverse device (3.1), a roller (3.2) and a transverse oil cylinder (3.4); the roller (3.2) is sleeved on the crossbeam (1.1) via the transverse device (3.1); the transverse oil cylinder (3.4) is mounted on one side of the upper surface of the crossbeam (1.1); the output rod of the transverse oil cylinder (3.4) is connected to the transverse device (3.1); and the transverse oil cylinder (3.4) drives the transverse roller (3) to move transversely via the transverse device (3.1).

5. The A-frame device for submarine cable laying and recovery operations according to claim 4, characterized in that: The transverse shifting roller (3) further comprises a pad and slider assembly (3.3), wherein a plurality of pads in the pad and slider assembly (3.3) are arranged in the middle of the crossbeam (1.1) and on the surface of the other side of the crossbeam (1.1) opposite to the transverse shifting cylinder (3.4), and a plurality of sliders in the pad and slider assembly (3.3) are uniformly distributed on the inner side of the transverse shifting device (3.1), and the sliders are connected to the pads.

6. The A-frame device for submarine cable laying and recovery operations according to claim 4, characterized in that: The drum (3.2) comprises an auxiliary annular bracket and a rope groove, and two auxiliary annular brackets are symmetrically arranged on both sides of the rope groove.

7. The A-frame device for submarine cable laying and recovery operations according to claim 4, characterized in that: The transverse oil cylinder (3.4) is a double-acting hydraulic oil cylinder. A two-way balancing valve group is provided beside the transverse oil cylinder (3.4). The transverse oil cylinder (3.4) realizes a self-locking holding function through the two-way balancing valve group.

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