Composite hoisting device of multifunctional ditching and cable laying machine

Abstract

A composite hoisting device of a multifunctional ditching and cable laying machine comprises a connecting base, a heavy hoisting point structure used for being hoisted through a steel wire rope and a light hoisting point structure used for being hoisted through an umbilical cable, and the heavy hoisting point structure comprises a sliding frame, a steel wire rope hoisting tool and a hoisting tool locking assembly; the lower end of the steel wire rope lifting appliance slides into the cavity of the connecting base along the sliding frame and is locked through the lifting appliance locking assembly; the light lifting point structure comprises an umbilical cable lifting point base and a connecting frame, the bottom of the umbilical cable lifting point base is hinged to the top of the connecting frame through first connecting plates extending out of the two sides of the bottom of the umbilical cable lifting point base, and the two sides of the bottom of the connecting frame are hinged to the two sides of the top of the connecting base respectively. After penetrating out of the connecting base, the steel wire rope is connected to an electrical cabinet of the trenching and cable laying machine. According to the utility model, the switching of two hoisting modes can be realized, the switching requirement of two working modes of the ditching and cable laying machine is met, the device is convenient and practical, and the stability, the safety and the success rate of the hoisting operation of the two modes can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater cable laying equipment, in particular to a composite hoisting device of a multifunctional trenching and cable laying machine. Background Art

[0002] Currently, trenchers are mainly divided into two categories. One is the suspended trencher, which has buoyancy materials arranged on the body, is very light in water, and is used for laying cables in soft soil conditions; the other is the walking trencher, which has no buoyancy materials and is heavier in water, and is used for laying cables in harder soil conditions. Because suspended trenchers are very light underwater, they are generally hoisted directly using armored umbilical cables. If wire rope is used for hoisting, the weight of the long-distance wire rope is heavier than the underwater weight of the machine, which greatly affects the machine's operation and may even cause the machine to be unable to move and operate. Walking trenchers, because they are heavy underwater, are generally hoisted using wire rope. If armored umbilical cables are used for direct hoisting, the umbilical cables often lack the load-bearing capacity. If the umbilical cables are thickened and reinforced to improve the load-bearing capacity, the umbilical cables will have a large diameter and increased costs. In response to different soil environments on the seabed, the two types of trenchers mentioned above are often required to operate alternately. Frequent replacement of operating machines also greatly reduces operating efficiency. If one machine can meet all soil conditions, the machine needs to have two modes: suspended and walking. The corresponding lifting device should also meet the two modes. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a composite hoisting device for a multifunctional trenching and cable laying machine which can freely switch between a wire rope hoisting mode and an umbilical cable hoisting mode to meet the two operating modes of the trenching and cable laying machine.

[0004] The utility model is realized through the following technical solutions:

[0005] A composite lifting device for a multifunctional trenching and cable laying machine comprises a connecting base, a heavy-duty lifting point structure for lifting a walking trenching and cable laying machine through a steel wire rope, and a light-duty lifting point structure for lifting a suspended trenching and cable laying machine through an umbilical cable. The bottom of the connecting base is hinged to the frame of the trenching and cable laying machine through a pin shaft. When the walking trenching and cable laying machine needs to be lifted, the top of the connecting base is connected to the heavy-duty lifting point structure. When the suspended trenching and cable laying machine needs to be lifted, the top of the connecting base is connected to the light-duty lifting point structure. A cavity is provided in the middle of the connecting base. The heavy-duty lifting point structure comprises a sliding frame, a steel wire rope sling and a sling locking assembly. The sliding frame The cam is connected to the top of the connecting base, and the lower end of the wire rope sling slides into the cavity of the connecting base along the sliding frame and is locked in the connecting base by the sling locking assembly arranged next to the cavity. The upper end of the wire rope sling is provided with a lifting lug for connecting the wire rope; the lightweight lifting point structure includes an umbilical cable sling, and the two sides of the bottom end of the umbilical cable sling are respectively hinged to the two sides of the top of the connecting base through pins, and a through hole for the umbilical cable to pass through is provided on the top of the umbilical cable sling. After the umbilical cable passes through the through hole, it passes through the cavity in the connecting base and is connected to the electrical box of the trenching and cable laying machine. The umbilical cable and the through hole on the umbilical cable sling are connected by glue.

[0006] Furthermore, the umbilical cable hoist includes an umbilical cable hanging point seat and a connecting frame, the through hole passes through the top of the umbilical cable hanging point seat, and two first connecting plates extend from both sides of the bottom of the umbilical cable hanging point seat. The two first connecting plates are hinged to the top of the connecting frame through pins, and the two sides of the bottom of the connecting frame are respectively hinged to the two sides of the top of the connecting base through pins.

[0007] Furthermore, the direction of the hinge axis of the umbilical cable hanging point seat and the top of the connecting frame is perpendicular to the hinge axis of the connecting frame and the connecting base, and the connecting frame forms a space for the umbilical cable to pass through.

[0008] Furthermore, hinge plates are respectively provided on both sides of the top of the connecting frame, and two hinge holes for hingedly connecting to the two first connecting plates on the umbilical cable hanging point seat are respectively provided on the two hinge plates, and each hinge plate is respectively provided with a first limit block on both sides near the hinge hole thereon, for limiting the swing amplitude of the connecting frame relative to the umbilical cable hanging point seat.

[0009] Furthermore, second connecting plates are respectively provided on both sides of the bottom of the connecting frame, and first hinge seats are respectively provided on both sides of the top of the connecting base, and a hinge hole is provided on the first hinge seat. The second connecting plate is hinged to the first hinge seat through the hinge hole, so that the two sides of the bottom end of the umbilical cable sling are respectively hinged to the two sides of the top of the connecting base, and each first hinge seat is respectively provided with a second limit block on both sides near the hinge hole thereon, which is used to limit the swing amplitude of the connecting base relative to the connecting frame.

[0010] Furthermore, the sliding frame is in the shape of a trumpet that is larger at the top and smaller at the bottom. The bottom of the trumpet is connected to the top of the connecting base through a flange. A number of guide grooves extending obliquely downward are provided on the funnel-shaped inner wall of the trumpet. The ends of the guide grooves are connected to the cavity of the connecting base so that the wire rope sling can slide into the cavity of the connecting base along the guide grooves.

[0011] Furthermore, the sling locking assembly includes a locking cylinder and a locking head, a first notch is provided on the side wall of the cavity of the connecting base, which allows the head of the locking head to extend into the cavity, and the middle part of the locking head can be rotatably mounted on the connecting base at a position close to the first notch, one end of the locking cylinder is hinged to the connecting base, and the other end of the locking cylinder is hinged to the tail of the locking head, and a groove is provided on the side surface of the wire rope sling that is adapted to the head of the locking head, and when the lower end of the wire rope sling slides into the cavity of the connecting base, the position of the groove is opposite to the position of the first notch on the side wall of the cavity of the connecting base, and the locking cylinder drives the head of the locking head to pass through the first notch on the side wall of the cavity and get stuck in the groove of the locking head to lock the wire rope sling in the connecting base.

[0012] Furthermore, the sling locking assembly has two groups, which are respectively arranged on both sides of the connection base, and the groove on the locking head and the first notch on the side wall of the connection base cavity are each provided with two corresponding groups.

[0013] Furthermore, a second notch is provided on the front side of the cavity of the connecting base to allow the umbilical cable to pass through, and the upper end of the second notch is closed by a connecting block to facilitate the limiting of the umbilical cable after passing through; a second hinged seat is provided at the bottom of the connecting base for hinged connection with the frame of the trenching and cable laying machine.

[0014] Furthermore, it also includes a cylinder mounting seat and an angle adjustment cylinder, the cylinder mounting seat is arranged on the frame of the trenching and cable laying machine, one end of the angle adjustment cylinder is hinged to the cylinder mounting seat, and the other end of the angle adjustment cylinder is hinged to the connecting base, and the direction of the hinge axis of the angle adjustment cylinder hinged to the connecting base is parallel to the hinge axis of the connecting base hinged to the frame of the trenching and cable laying machine.

[0015] The utility model is configured with two lifting point structures - a heavy-duty lifting point structure and a light-duty lifting point structure. The switch between the two lifting modes can be realized by only installing and uninstalling the heavy-duty lifting point structure or the light-duty lifting point structure, thereby meeting the switching requirements of the two working modes of the trenching and cable laying machine, and there is no need to disassemble the connection base connected to the trenching and cable laying machine, as well as the cylinder mounting seat and the angle adjustment cylinder, which is convenient and practical. For the mode of lifting with a wire rope, the automatic locking and release of the spreader can be achieved through the spreader locking assembly, and the angle of the connection base can be adjusted by the angle adjustment cylinder, so that the spreader can smoothly enter and exit the cavity of the connection base, thereby achieving connection with the connection base. The connection and separation of the base ensures the safety and success rate of the lifting operation; for the armored umbilical cable lifting mode, the lightweight lifting point structure releases the rotational freedom at several nodes through the mutual articulation of several components, so that when water flow, waves and other environmental impacts on the equipment, the front and back, left and right swings of the lifting point structure can be used as a buffer to transfer the cyclic force point to the umbilical cable lifting point seat and the connecting frame, avoiding the umbilical cable connection position from being damaged by cyclic force, and the swing amplitude between the connection base, the connecting frame and the umbilical cable lifting point seat is constrained by two limit blocks to ensure the smoothness and safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the connection base in an embodiment of the utility model.

[0017] Figure 2 This is a schematic diagram of the front structure of mode 1 in the embodiment of the utility model.

[0018] Figure 3 This is a cross-sectional view of mode 1 in the embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the front structure of mode 2 in the embodiment of the present utility model.

[0020] Figure 5 This is a cross-sectional view of mode 2 in the embodiment of the present invention.

[0021] Figure 6 This is a structural diagram of Mode 2 in an embodiment of the present utility model.

[0022] Figure 7 This is a structural diagram from another perspective of Mode 2 in an embodiment of the present utility model.

[0023] Figure 8 This is a structural exploded view of the connecting base in the second embodiment of the present invention.

[0024] Figure 9 This is a structural diagram of the first limiting block in the second embodiment of the present utility model.

[0025] Figure 10This is a structural diagram of the second limiting block in the second embodiment of the present invention.

[0026] Figure markings: 1-connecting base; 2-cylinder mounting seat; 3-angle adjustment cylinder; 4-sliding frame; 5-wire rope sling; 6-sling locking assembly; 7-umbilical cable sling; 8-umbilical cable; 11-cavity; 12-first articulated seat; 121-second limit block; 13-second notch; 14-connecting block; 15-second articulated seat; 16-fourth articulated seat; 17-third articulated seat; 18-first notch; 41-guide groove; 51-groove; 52-lifting ear; 61-locking cylinder; 62-locking head; 621-head; 622-tail; 71-umbilical cable lifting point seat; 72-connecting frame; 711-through hole; 712-first connecting plate; 721-articulated plate; 722-second connecting plate; 723-first limit block. DETAILED DESCRIPTION

[0027] A composite hoisting device for a multifunctional trenching and cable laying machine includes a connecting base 1, a cylinder mounting base 2, an angle adjustment cylinder 3, a heavy-duty lifting point structure for hoisting a walking trenching and cable laying machine via a steel wire rope, and a light-duty lifting point structure for hoisting a suspended trenching and cable laying machine via an umbilical cable 8. The bottom of the connecting base 1 is hinged to the frame of the trenching and cable laying machine via a pin shaft, and a cavity 11 is provided in the middle of the connecting base 1. When the walking trenching and cable laying machine needs to be hoisted, the top of the connecting base 1 is connected to the heavy-duty lifting point structure. When the suspended trenching and cable laying machine needs to be hoisted, the top of the connecting base 1 is connected to the light-duty lifting point structure. Figure 2 、 Figure 4 As shown, the cylinder mounting seat 2 is set on the frame of the trenching and cable laying machine, one end of the angle adjustment cylinder 3 is hinged on the cylinder mounting seat 2, and the other end of the angle adjustment cylinder 3 is hinged to the connecting base 1. Specifically, as shown Figure 1 A third articulated seat 17 is provided on the connecting base 1, and the other end of the angle adjustment cylinder 3 is hinged to the third articulated seat 17, and the direction of the articulated axis of the angle adjustment cylinder 3 and the connecting base 1 is parallel to the articulated axis of the connecting base 1 and the frame of the trenching and cable laying machine.

[0028] Mode 1: Using wire rope to hang

[0029] For walking trenchers, due to their heavy weight, heavy lifting point structures should be used and hoisted by wire ropes. Figure 2 、 Figure 3The heavy lifting point structure includes a sliding frame 4, a wire rope sling 5 and a sling locking assembly 6. The sliding frame 4 is connected to the top of the connecting base 1, and the lower end of the wire rope sling 5 slides into the cavity 11 of the connecting base 1 along the sliding frame 4, and is locked in the connecting base 1 by the sling locking assembly 6 arranged next to the cavity 11. The upper end of the wire rope sling 5 is provided with a lifting lug 52 for connecting the wire rope, and the wire rope is connected to the upper end of the wire rope sling 5. The lower end of the wire rope sling 5 is connected to the connecting base 1, and the bottom of the connecting base 1 is connected to the frame of the trenching and cable laying machine, so that the trenching and cable laying machine can be lifted by the wire rope.

[0030] As one of the embodiments, the sliding frame 4 is in the shape of a trumpet that is larger at the top and smaller at the bottom. The bottom of the trumpet is connected to the top of the connecting base 1 through a flange. A plurality of guide grooves 41 extending obliquely downward are provided on the funnel-shaped inner wall of the trumpet. The ends of the guide grooves 41 are connected to the cavity 11 of the connecting base 1 so that the wire rope sling 5 can slide into the cavity 11 of the connecting base 1 along the guide grooves 41, thereby avoiding the difficulty in accurately introducing the wire rope sling 5 into the connecting base 1.

[0031] The function of the sling locking assembly 6 is to automatically lock the wire rope sling 5 to prevent it from falling off during the lifting process, and can be automatically released. In this embodiment, the sling locking assembly 6 includes a locking cylinder 61 and a locking head 62. The side wall of the cavity 11 of the connecting base 1 is provided with a first notch 18 that allows the head 621 of the locking head 62 to extend into the cavity 11. The middle part of the locking head 62 can be rotatably installed on the connecting base 1 at a position close to the first notch 18. One end of the locking cylinder 61 is hinged to the fourth hinge seat 16 of the connecting base 1, and the other end of the locking cylinder 61 is hinged to the tail 622 of the locking head 62. The fourth hinge seat 16 is provided at the bottom of the connection base 1. A groove 51 is provided on the side of the wire rope sling 5, which is adapted to the head 621 of the locking head 62. When the lower end of the wire rope sling 5 slides into the cavity 11 of the connection base 1, the position of the groove 51 is opposite to the position of the first notch 18 on the side wall of the cavity 11 of the connection base 1. The locking cylinder 61 drives the head 621 of the locking head 62 through the first notch 18 on the side wall of the cavity 11 and is stuck in the groove 51 of the locking head 62 to lock the wire rope sling 5 in the connection base 1. The sling locking assembly 6 has two groups, one on each side of the connection base 1, and two corresponding groups are provided for each of the grooves 51 on the locking head 62 and the first notch 18 on the side wall of the cavity 11 of the connection base 1.

[0032] When lifting and locking is required, the wire rope sling 5 is introduced into the cavity 11 of the connecting base 1 through the guide groove 41 on the sliding frame 4. When the groove 51 of the wire rope sling 5 is opposite to the first notch 18 on the side wall of the cavity 11 of the connecting base 1, the locking cylinder 61 retracts and drives the locking head 62 to rotate. The locking head 62 extends into the groove 51 of the wire rope sling 5 through the first notch 18 on the side wall of the cavity 11, thereby locking the wire rope sling 5. At this time, no matter how the wire rope moves, the wire rope sling 5 will be firmly stuck, and will not fall off during the process of lifting the trenching and cable laying machine.

[0033] When the lifting is completed and the wire rope sling 5 needs to be released, the locking cylinder 61 extends to drive the locking head 62 to rotate, and the locking head 62 moves away from the groove 51 of the wire rope sling 5 and withdraws from the first notch 18. There is no obstacle in the cavity 11 of the connecting base 1, and the wire rope sling 5 can be pulled out by the wire rope without interfering with the work of the trenching and cable laying machine.

[0034] When the sliding frame 4 and the connecting base 1 are tilted due to terrain reasons, resulting in the wire rope sling 5 pulled by the wire rope being unable to enter the cavity 11 in the connecting base 1 through the guide groove 41, the angle of the connecting base 1 and the sliding frame 4 is adjusted by telescoping the angle adjustment cylinder 3 so that the sliding frame 4 maintains a vertical upward posture, and the wire rope sling 5 can slide into the cavity 11 in the connecting base 1 along the guide groove 41; similarly, the wire rope sling 5 can also smoothly escape from the cavity 11 of the connecting base 1.

[0035] Mode 2: Using umbilical cable 8 to place

[0036] For suspended trenching machines, due to their light weight, it is advisable to adopt a light lifting point structure and to lift them through the armored umbilical cable 8 configured by the trenching and laying machine itself. Figures 4 to 8 As shown, the lightweight lifting point structure includes an umbilical cable sling 7, and the two sides of the bottom end of the umbilical cable sling 7 are respectively hinged to the two sides of the top of the connecting base 1 through pins. A through hole 711 for the umbilical cable 8 to pass through is provided on the top of the umbilical cable sling 7. After the umbilical cable 8 passes through the through hole 711, it passes through the cavity 11 in the connecting base 1 and is connected to the electrical box of the trenching and cable laying machine. The umbilical cable 8 and the through hole 711 on the umbilical cable sling 7 are connected by glue injection, that is, glue is injected into the gap between the through hole 711 on the umbilical cable sling 7 and the umbilical cable 8, and the umbilical cable 8 and the umbilical cable sling 7 are connected together to form a load-bearing part.

[0037] In this embodiment, the umbilical cable hoist 7 includes an umbilical cable suspension point seat 71 and a connecting frame 72. The through hole 711 passes through the top of the umbilical cable suspension point seat 71. Two first connecting plates 712 extend from the bottom of the umbilical cable suspension point seat 71 on both sides. The two first connecting plates 712 are hinged to the top of the connecting frame 72 via pins. The bottom of the connecting frame 72 is hinged to the top of the connecting base 1 via pins. The direction of the hinge axis between the umbilical cable suspension point seat 71 and the top of the connecting frame 72 is perpendicular to the hinge axis between the connecting frame 72 and the connecting base 1. The connecting frame 72 forms a space for the umbilical cable 8 to pass through.

[0038] Specifically, hinge plates 721 are provided on both sides of the top of the connecting frame 72, and two hinge holes for hinged connection with the two first connecting plates 712 on the umbilical cable hanging point seat 71 are respectively provided on the two hinge plates 721. A first limit block 723 is provided on both sides of each hinge plate 721 near the hinge hole thereof. The first limit block 723 can be as shown in FIG. Figure 9 As shown, it is used to limit the swing amplitude of the connecting frame 72 relative to the umbilical cable hanging point seat 71.

[0039] The bottom sides of the connecting frame 72 are respectively provided with second connecting plates 722, and the top sides of the connecting base 1 are respectively provided with first hinge seats 12, and the first hinge seats 12 are provided with hinge holes. The second connecting plates 722 are hinged to the first hinge seats 12 through the hinge holes, so as to realize that the bottom sides of the umbilical cable hoist 7 are respectively hinged to the top sides of the connecting base 1, and each first hinge seat 12 is provided with a second limit block 121 on both sides near the hinge hole thereof. The second limit block 121 can be as shown in FIG. Figure 10 As shown, it is used to limit the swing amplitude of the connecting base 1 relative to the connecting frame 72.

[0040] In this embodiment, a second notch 13 is provided on the front side of the cavity 11 of the connection base 1 to allow the umbilical cable 8 to pass through. Figure 7 、 Figure 8 The upper end of the second notch 13 is closed by a connecting block 14 to facilitate the positioning of the umbilical cable 8 after passing through. A second hinge seat 15 is provided at the bottom of the connecting base 1 for hinged connection with the frame of the trenching and cable laying machine.

[0041] The method of hoisting the umbilical cable 8 releases the rotational freedom of the umbilical cable hanging point seat 71 and the connecting frame 72, so that the trenching and cable laying machine can swing back and forth and left and right when the waves fluctuate, thereby avoiding damage to the umbilical cable 8 and protecting the umbilical cable 8; at the same time, the first limit block 723 and the second limit block 121 can respectively limit the swing range of the umbilical cable hanging point seat 71 and the connecting frame 72 to avoid excessive shaking.

[0042] When the trenching and cable laying machine is equipped with buoyancy materials to achieve a suspended mode, mode 2 is selected and, by installing various components, the machine can be suspended using the umbilical cable 8. When the machine lacks buoyancy materials, mode 1 is selected and, by installing various components, the machine can be suspended using a wire rope. Switching between the two modes is accomplished simply by disassembling the heavy or light lifting point structure. The present invention allows switching between two suspension modes by installing various components, enabling a single machine to meet various operating conditions.

[0043] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the present invention should be included in the patent scope of this case.

Claims

1. A composite hoisting device for a multifunctional trenching and cable laying machine, characterized in that: The invention comprises a connecting base, a heavy-duty lifting point structure for hanging a walking trenching and cable-laying machine by a steel wire rope, and a light-duty lifting point structure for hanging a suspended trenching and cable-laying machine by an umbilical cable. The bottom of the connecting base is hinged to the frame of the trenching and cable-laying machine through a pin shaft. When the walking trenching and cable-laying machine needs to be hung, the top of the connecting base is connected to the heavy-duty lifting point structure. When the suspended trenching and cable-laying machine needs to be hung, the top of the connecting base is connected to the light-duty lifting point structure. A cavity is provided in the middle of the connecting base. The heavy-duty lifting point structure comprises a sliding frame, a steel wire rope sling and a sling locking assembly. The sliding frame is connected to the top of the connecting base. The lower end of the wire rope sling slides into the cavity of the connecting base along the sliding frame and is locked in the connecting base by the sling locking assembly arranged next to the cavity, and the upper end of the wire rope sling is provided with a lifting lug for connecting the wire rope; the lightweight lifting point structure includes an umbilical cable sling, and the two sides of the bottom end of the umbilical cable sling are respectively hinged to the two sides of the top of the connecting base through pins, and a through hole for the umbilical cable to pass through is provided on the top of the umbilical cable sling. After the umbilical cable passes through the through hole, it passes through the cavity in the connecting base and is connected to the electrical box of the trenching and cable laying machine. The umbilical cable and the through hole on the umbilical cable sling are connected by glue.

2. The composite hoisting device of a multifunctional trenching and cable laying machine according to claim 1, characterized in that: The umbilical cable hoist includes an umbilical cable hanging point seat and a connecting frame. The through hole passes through the top of the umbilical cable hanging point seat. Two first connecting plates extend from both sides of the bottom of the umbilical cable hanging point seat. The two first connecting plates are hinged to the top of the connecting frame through pins. The two sides of the bottom of the connecting frame are respectively hinged to the two sides of the top of the connecting base through pins.

3. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 2, characterized in that: The direction of the hinge axis of the umbilical cable hanging point seat and the top of the connecting frame is perpendicular to the hinge axis of the connecting frame and the connecting base, and the connecting frame forms a space for the umbilical cable to pass through.

4. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 2, characterized in that: Hinge plates are respectively provided on both sides of the top of the connecting frame, and hinge holes for hinged connection with the two first connecting plates on the umbilical cable hanging point seat are respectively provided on the two hinge plates. First limit blocks are respectively provided on both sides of each hinge plate near the hinge hole thereon, for limiting the swing amplitude of the connecting frame relative to the umbilical cable hanging point seat.

5. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 2, characterized in that: A second connecting plate is provided on both sides of the bottom of the connecting frame, and a first hinge seat is provided on both sides of the top of the connecting base. The first hinge seat is provided with a hinge hole, and the second connecting plate is hinged to the first hinge seat through the hinge hole, so that the two sides of the bottom end of the umbilical cable sling are respectively hinged to the two sides of the top of the connecting base. Each first hinge seat is provided with a second limit block on both sides near the hinge hole thereon, which is used to limit the swing amplitude of the connecting base relative to the connecting frame.

6. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 1, characterized in that: The sliding frame is in the shape of a trumpet that is larger at the top and smaller at the bottom. The bottom of the trumpet is connected to the top of the connecting base through a flange. A plurality of guide grooves extending obliquely downward are provided on the funnel-shaped inner wall of the trumpet. The ends of the guide grooves are connected to the cavity of the connecting base so that the wire rope sling can slide into the cavity of the connecting base along the guide grooves.

7. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 1, characterized in that: The sling locking assembly includes a locking cylinder and a locking head, wherein a first notch is provided on the side wall of the cavity of the connecting base to allow the head of the locking head to extend into the cavity, and the middle part of the locking head can be rotatably mounted on the connecting base at a position close to the first notch, one end of the locking cylinder is hinged on the connecting base, and the other end of the locking cylinder is hinged to the tail of the locking head, and a groove adapted to the head of the locking head is provided on the side surface of the wire rope sling, and when the lower end of the wire rope sling slides into the cavity of the connecting base, the position of the groove is opposite to the position of the first notch on the side wall of the cavity of the connecting base, and the locking cylinder drives the head of the locking head to pass through the first notch on the side wall of the cavity and get stuck in the groove of the locking head to lock the wire rope sling in the connecting base.

8. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 7, characterized in that: The sling locking assembly has two groups, which are respectively arranged on both sides of the connecting base. The groove on the locking head and the first notch on the side wall of the connecting base cavity are each provided with two corresponding groups.

9. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 1, characterized in that: A second notch is provided on the front side of the cavity of the connecting base to allow the umbilical cable to pass through, and the upper end of the second notch is closed by a connecting block to facilitate the limiting of the umbilical cable after passing through; a second hinged seat is provided at the bottom of the connecting base for hinged connection with the frame of the trenching and cable laying machine.

10. The composite hoisting device for a multifunctional trenching and cable laying machine according to claim 1, characterized in that: It also includes a cylinder mounting seat and an angle adjustment cylinder, wherein the cylinder mounting seat is arranged on the frame of the trenching and cable laying machine, one end of the angle adjustment cylinder is hinged to the cylinder mounting seat, and the other end of the angle adjustment cylinder is hinged to the connecting base, and the direction of the hinge axis of the angle adjustment cylinder hinged to the connecting base is parallel to the hinge axis of the connecting base hinged to the frame of the trenching and cable laying machine.

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