Hoisting system for underwater blind hoisting

Abstract

The utility model discloses a hoisting system for underwater blind hoisting, and particularly relates to the technical field of underwater engineering, which comprises a hoisting head, a hoisting tool catcher and a guide assembly, the guiding assembly comprises a connecting piece used for guiding the lifting appliance catcher and the lifting head to be in butt joint and locked, and a traction piece used for relieving butt joint and locking of the lifting appliance catcher and the lifting head. The lifting appliance catcher is movably connected to the outer surface of the connecting piece in a sleeving manner and slides along the connecting piece, and a locking mechanism for catching the lifting head is arranged on the lifting appliance catcher; and one end of the connecting piece is fixedly connected with the hoisting head. According to the utility model, through the combination of the lifting head and the lifting appliance catcher and the utilization of the shape of the conical lifting appliance head, the catching accuracy and stability in the underwater environment are improved, the lifting function can be completed without direct underwater contact, the lifting efficiency is improved, and the safety risk in the operation process is reduced; and the application range and the flexibility of the hoisting operation are improved.

Description

Technical Field

[0001] This utility model relates to the field of underwater engineering technology, and more specifically, to a lifting system for underwater blind lifting. Background Technology

[0002] In wastewater and other underwater engineering fields, heavy-duty submersible pumps play a crucial role, commonly used in drainage, irrigation, and underwater operations. However, current technologies for underwater lifting of heavy-duty submersible pumps rely heavily on traditional methods, which have significant limitations: First, traditional methods often require draining the work area to expose the pump, which is time-consuming, labor-intensive, and may cause unnecessary environmental damage. Second, even with pre-installed steel chains, complex surface operations such as fixing, hooking, and moving attachment points are necessary, which are inefficient and pose significant safety risks. Therefore, existing underwater lifting technologies face significant challenges in achieving precise positioning. Furthermore, the complex underwater environment, insufficient light, and limited visibility make it difficult for operators to accurately determine the pump's position and status, increasing operational difficulty and the risk of failure. Existing lifting solutions also lack stability, making them prone to swaying or detachment during lifting, further exacerbating safety risks.

[0003] To address the challenges of positioning difficulties and unstable lifting caused by limited visibility due to complex underwater environments when hoisting heavy submersible pumps, a lifting system for underwater blind hoisting is proposed as a further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of this utility model provide a lifting system for underwater blind lifting to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lifting system for underwater blind lifting, comprising: a lifting head fixedly installed on the top of the lifting load, a lifting catcher detachably connected to the hook of the lifting equipment, and a guide assembly;

[0006] The guiding assembly includes: a connector for guiding and locking the spreader catcher to dock with and lock the lifting head, and a traction component for releasing the spreader catcher from docking and locking with the lifting head;

[0007] The lifting device catcher is movably sleeved on the connector and slides along the connector. The lifting device catcher is provided with a locking mechanism for catching the lifting head.

[0008] One end of the connector is fixedly connected to the hoisting head; one end of the traction component is fixedly connected to the locking mechanism.

[0009] Furthermore, the locking mechanism includes: a first pull rod, a second pull rod, a locking load-bearing block, a locking spring, and a locking load-bearing shaft;

[0010] The two locking bearing shafts are rotatably connected to both sides of the lifting device, and the two locking bearing blocks used to capture the lifting head are fixedly connected to the middle of the two locking bearing shafts. One end of the first pull rod and one end of the second pull rod are fixedly installed at both ends of the locking bearing shafts. The two second pull rods are fixedly connected by a locking spring. The ends of the two first pull rods away from the locking bearing shafts are fixedly connected to the traction component.

[0011] Furthermore, the lifting head includes: a conical lifting head and a circular support column fixedly installed on top of the load being lifted.

[0012] The smaller end of the conical lifting head is configured as a connecting end, the bottom surface of the conical lifting head is configured as a locking surface, the connecting end is fixedly connected to one end of the connecting piece, the diameter of the locking surface is larger than the diameter of the circular support column, and the top of the circular support column is fixedly connected to the middle of the locking surface.

[0013] The two locking load-bearing blocks clamp the circular support column at their close ends and contact the locking surface.

[0014] Furthermore, the inside of the lifting device catcher is provided with a catching cavity extending to the bottom surface, the catching cavity including: a conical cavity located inside the lifting device catcher and a cylindrical cavity located between the bottom surface of the lifting device catcher and the conical cavity;

[0015] The shape of the conical cavity is the same as that of the conical lifting head, the maximum diameter of the conical cavity is not greater than the diameter of the cylindrical cavity, and the diameter of the locking surface is not greater than the diameter of the cylindrical cavity;

[0016] The lifting device catcher is fixedly installed with a limit block on the side near the first tie rod, and the traction component passes through the interior of the limit block;

[0017] The top of the lifting device has a through hole communicating with the conical cavity, and one end of the connector passing through the through hole is fixedly connected to the conical lifting head.

[0018] The top of the lifting device is fixedly mounted on both sides with a fixed base, which is then hung on the hook of the lifting equipment via an auxiliary device.

[0019] Furthermore, the lifting device includes: a positioning bucket, a load-bearing side plate, and an auxiliary side plate of the outer shell;

[0020] Two opposing and parallel load-bearing side plates and two opposing and parallel outer shell auxiliary side plates are respectively fixedly installed around the positioning bucket. The top of each of the two load-bearing side plates is fixedly installed with a fixing seat, and the fixing seat is hung on the hook of the hoisting equipment through an auxiliary device.

[0021] The inner diameter of the positioning barrel is not less than the diameter of the locking surface.

[0022] Furthermore, the positioning barrel has through slots on both sides for locking the rotation of the load-bearing block.

[0023] Furthermore, the auxiliary device includes: a lifting ring and a sling;

[0024] The lifting ring passes through the top of the fixed base and is rotatably connected to the fixed base. The two ends of the sling are respectively movably sleeved on the top of the two lifting rings, and the sling is hung on the hook of the lifting equipment.

[0025] The technical effects and advantages of this utility model are as follows:

[0026] 1. Compared with traditional heavy-duty submersible pump lifting systems and methods that require direct operation by divers or underwater robots, this system combines a lifting head with a spreader catcher. Utilizing the conical shape of the lifting head, the catcher's alignment efficiency is improved, effectively enhancing the accuracy and stability of the catcher in underwater environments. This allows for lifting without direct underwater contact, significantly increasing lifting efficiency and reducing safety risks during operation. The conical design of the spreader head and catcher enables it to adapt to various complex underwater environments, including extreme conditions such as low visibility and high currents. The conical structure eliminates the angle requirement for the catcher's descent direction, thereby increasing the applicability and flexibility of lifting operations.

[0027] 2. Compared with existing technologies, the guide assembly guides the catcher to slide smoothly into and lock onto the lifting head, thereby simplifying the operation process, improving the stability and safety of lifting, and avoiding lifting failures or accidents caused by improper operation or environmental factors. After the lifting work is completed, the locking mechanism on the catcher enables the catcher to quickly disengage from the lifting head. By reducing potential risks and equipment damage during the lifting process, this invention helps to improve the utilization rate of heavy-duty submersible pumps and extend their service life, providing more reliable and efficient equipment support for the production and operation of related industries.

[0028] 3. Compared with the prior art, the lifting system for underwater blind lifting of this utility model simplifies the operation process, reduces the skill requirements of operators, eliminates the need for divers or drainage and pool cleaning operations, thereby reducing equipment damage and corresponding maintenance costs caused by improper operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0030] Figure 2 This is a side view of Embodiment 1 of the lifting device catcher of this utility model.

[0031] Figure 3 This is a front view of Embodiment 1 of the lifting device capture device of this utility model.

[0032] Figure 4 This is a rear view of Embodiment 1 of the lifting device capture device of this utility model.

[0033] Figure 5 This is an exploded view of the locking mechanism of this utility model.

[0034] Figure 6 This is a schematic diagram of the lifting head of this utility model.

[0035] Figure 7 This is an exploded structural diagram of Embodiment 2 of the lifting device capture device of this utility model.

[0036] The attached figures are labeled as follows:

[0037] 1. Lifting head;

[0038] 11. Conical lifting head; 111. Connecting end; 112. Locking surface;

[0039] 12. Circular support column;

[0040] 2. Lifting glove catcher;

[0041] 21. Capturing cavity; 211. Conical cavity; 212. Cylindrical cavity;

[0042] 22. Limit block;

[0043] 23. Through hole;

[0044] 24. Fixture

[0045] 25. Positioning barrel; 251. Through groove;

[0046] 26. Load-bearing side panels;

[0047] 27. Auxiliary side panels of the outer casing;

[0048] 3. Guiding components; 31. Connecting components; 32. Traction components;

[0049] 4. Locking mechanism;

[0050] 41. First pull rod; 42. Second pull rod; 43. Locking load block; 44. Locking spring;

[0051] 45. Lock the load-bearing shaft;

[0052] 5. Auxiliary devices; 51. Lifting rings; 52. Lifting straps. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0054] As attached Figure 1-7 The lifting system shown includes: a lifting head 1 fixedly installed on top of the load being lifted, a lifting catcher 2 detachably connected to the hook of the lifting equipment, and a guide assembly 3;

[0055] In particular, this utility model can be used to lift loads such as submersible pumps;

[0056] Among them, the lifting catcher 2 has a carbon steel shell, which is positioned by bolts and fixed by welding, and has a load-bearing function;

[0057] The guiding assembly 3 includes: a connector 31 for guiding and locking the spreader catcher 2 to dock with and lock the lifting head 1, and a traction member 32 for releasing the spreader catcher 2 from docking and locking with the lifting head 1;

[0058] The lifting device catcher 2 is movably sleeved on the outer surface of the connector 31 and slides along the connector 31. The lifting device catcher 2 is provided with a locking mechanism 4 for catching the lifting head 1.

[0059] One end of the connector 31 is fixedly connected to the hoisting head 1, and the other end of the connector 31 extends to the ground so that the connector 31 has a fixed point.

[0060] The lifting head 1 includes: a conical lifting head 11 and a circular support column 12 fixedly installed on the top of the load being lifted.

[0061] The smaller end of the conical lifting head 11 is set as the connecting end 111, the bottom surface of the conical lifting head 11 is set as the locking surface 112, the connecting end 111 is fixedly connected to one end of the connector 31, the diameter of the locking surface 112 is larger than the diameter of the circular support column 12, and the top of the circular support column 12 is fixedly connected to the middle of the locking surface 112.

[0062] Two locking load-bearing blocks 43 clamp the circular support column 12 at one end and contact the locking surface 112, so that the locking load-bearing blocks 43 can lock the lifting device catcher 2;

[0063] Among them, the lifting head 1 is one of the core components of this utility model device. Since the end of the conical lifting head 11 is a cone, the stability and guiding properties of the cone not only facilitate the capture of the lifting device 2, but also ensure a stable connection between the lifting head 1 and the lifting device 2 during the lifting process, and are not limited by the horizontal angle. The lifting head 1 is made of high-strength 45# steel through processing and tempering. After processing, the surface of the finished product is treated with passivation process, which has excellent corrosion resistance and wear resistance, and can adapt to harsh underwater environments.

[0064] In addition to the conical shape, the conical lifting head 11 at the end of the lifting head 1 can also be other shapes (such as cylindrical, spherical or specially designed polyhedral). As long as it can effectively cooperate with the lifting catcher 2 and achieve the locking function, it can be used.

[0065] Among them, the lifting device catcher 2 is another key component of this utility model. It is hung on the hook of the lifting equipment and is associated with the lifting head 1 through the guide assembly 3. The lifting device catcher 2 can be made of ordinary Q250 steel and 45# steel, which has the characteristics of low cost and high strength. The lifting device catcher 2 can also have a variety of designs, such as using a spring-loaded mechanical clamping mechanism, a magnetic catcher, or a flexible rope with a hook. These alternative designs can be selected according to the specific application scenario and lifting requirements.

[0066] One of the innovative aspects of this invention is the guiding component 3. The connector 31, installed on the lifting head 1, can be made of corrosion-resistant stainless steel wire rope, which guides the spreader catcher 2 to move smoothly along a predetermined path until the spreader catcher 2 docks with and locks into the lifting head 1; the other end of the connector 31 extends to the ground. The guiding component 3 can be further optimized, for example, by using more robust and wear-resistant materials, or by designing a more complex guide rope retraction structure on the spreader catcher 2 to reduce manual operation.

[0067] Among them, the traction component 32 is a nylon rope that pulls the first lever 41 in the locking mechanism 4 as a release operation, so that the lifting device catcher 2 can catch the lifting head 1 and perform the unlocking and separation action.

[0068] The locking mechanism 4 could incorporate wireless remote control technology or an automatic locking system to further enhance the flexibility and safety of hoisting operations. For example, the locking or releasing of the catcher could be triggered by a remote control signal, or automatic locking could be achieved using sensors and algorithms.

[0069] Furthermore, it is also possible to integrate sensors and monitoring systems into the lifting head 1 and the spreader catcher 2, which can monitor various parameters (such as tension, angle, speed, etc.) during the lifting process in real time, thereby providing more accurate operation guidance and safety warnings.

[0070] In a preferred embodiment, as shown in the appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 and attached Figure 7 As shown, the locking mechanism 4 includes: a first pull rod 41, a second pull rod 42, a locking load block 43, a locking spring 44, and a locking load shaft 45;

[0071] Two locking load-bearing shafts 45 are rotatably connected to both sides of the lifting device 2. Two locking load-bearing blocks 43 used to capture the lifting head 1 are fixedly connected to the middle of the two locking load-bearing shafts 45. One end of the first pull rod 41 and one end of the second pull rod 42 are fixedly installed at both ends of the locking load-bearing shaft 45. The two second pull rods 42 are fixedly connected by a locking spring 44. The ends of the two first pull rods 41 away from the locking load-bearing shaft 45 are fixedly connected to the traction member 32.

[0072] Among them, the locking load-bearing block 43 is a solid metal block inside the lifting device catcher 2, used to lock the lifting head 1 and bear the entire lifting load.

[0073] Among them, the first pull rod 41 and the second pull rod 42 are two sets of pull rod structures installed on the catcher, which mainly achieve locking and unlocking actions on the locking load-bearing block 43 through the locking spring 44 and the locking load-bearing shaft 45;

[0074] Among them, the locking spring 44 is a locking reverse tension spring;

[0075] The locking mechanism 4 is equivalent to a release lever, with the locking bearing shaft 45 as the fulcrum. When the traction member 32 is pulled, the first pull rod 41 and the second pull rod 42 become the power arm and the resistance arm, respectively. When the traction member 32 is released, the first pull rod 41 and the second pull rod 42 become the resistance arm and the power arm, respectively. This enables the rapid separation of the lifting device catcher 2 from the lifting head 1.

[0076] Example 1 of lifting device catcher 2: As shown in the attached document Figure 2 Appendix Figure 3 and attached Figure 4 As shown, the inside of the lifting device catcher 2 is provided with a catching cavity 21 extending to the bottom surface. The catching cavity 21 includes: a conical cavity 211 located inside the lifting device catcher 2 and a cylindrical cavity 212 located between the bottom surface of the lifting device catcher 2 and the conical cavity 211.

[0077] The shape of the conical cavity 211 is the same as that of the conical lifting head 11. The maximum diameter of the conical cavity 211 is not greater than the diameter of the cylindrical cavity 212, and the diameter of the locking surface 112 is not greater than the diameter of the cylindrical cavity 212.

[0078] Among them, the surface of the conical lifting head 11 of the lifting head 1 is a locking surface that matches the conical cavity 211 inside the lifting catcher 2. Due to its structure and stress characteristics, it can ensure the precise docking and stable locking of the lifting catcher 2 and the lifting head 1 during the lifting process.

[0079] A limit block 22 is fixedly installed on the side of the lifting device 2 near the first tie rod 41, and the traction component 32 passes through the interior of the limit block 22.

[0080] Since one end of the traction member 32 is connected to two first pull rods 41, the end of the traction member 32 near the first pull rod 41 is divided into two. Therefore, a spring is added between the separation point and the limiting block 22 to improve the structure.

[0081] The top of the lifting device 2 has a through hole 23 that communicates with the conical cavity 211, and the end of the connector 31 that passes through the through hole 23 is fixedly connected to the conical lifting head 11.

[0082] The lifting head 1 has a hollow tip. If the connecting part 31 is a stainless steel guide cable, the connecting part 31 passes through the through hole 23 and extends to the ground to achieve the guiding and positioning of the lifting device catcher 2.

[0083] Both sides of the top of the lifting catcher 2 are fixedly installed with a fixed base 24, and the fixed base 24 is hung on the hook of the lifting equipment through the auxiliary device 5.

[0084] Example 2 of the lifting device catcher: as shown in the attached document Figure 1 and attached Figure 7 As shown, the lifting device catcher 2 includes: a positioning bucket 25, a load-bearing side plate 26, and an outer shell auxiliary side plate 27;

[0085] Two opposing and parallel load-bearing side plates 26 and two opposing and parallel outer shell auxiliary side plates 27 are respectively fixedly installed around the positioning bucket 25. The top of each of the two load-bearing side plates 26 is fixedly installed with a fixing seat 24, and the fixing seat 24 is hung on the hook of the hoisting equipment through the auxiliary device 5.

[0086] The inner diameter of the positioning barrel 25 is not less than the diameter of the locking surface 112;

[0087] The positioning barrel 25 is used to capture the conical lifting head 11 of the lifting head 1 so that the locking load block 43 can contact the locking surface 112 to achieve the locking function.

[0088] In a preferred embodiment, as shown in the appendix Figure 7 As shown, the positioning barrel 25 has through slots 251 on both sides for locking the rotation of the load-bearing block 43, so that the rotation of the load-bearing block 43 is not obstructed.

[0089] In a preferred embodiment, as shown in the appendix Figure 1 and attached Figure 7 As shown, the auxiliary device 5 includes: a lifting ring 51 and a lifting strap 52;

[0090] The lifting ring 51 passes through the top of the fixed base 24 and is rotatably connected to the fixed base 24. The two ends of the sling 52 are respectively movably sleeved on the top of the two lifting rings 51, and the sling 52 is hung on the hook of the lifting equipment so that the lifting catcher 2 that has captured the conical lifting head 11 can be lifted by the hook of the lifting equipment.

[0091] The lifting method based on the above-mentioned lifting system for underwater blind lifting includes the following steps:

[0092] Step 1: Preparation:

[0093] First, install the lifting head 1 on the load to be lifted, and ensure that the two are firmly connected. Then, extend the connector 31 installed on the lifting head 1 to the ground, tighten it appropriately, and keep it ready for use.

[0094] Step Two: Start the hoisting process:

[0095] When a load needs to be lifted, first check whether the locking mechanism 4 and the traction component 32 of the spreader catcher 2 move flexibly without jamming; after confirming that the traction component 32 moves smoothly, with moderate elasticity and no abnormalities, the operator starts the lifting equipment, passes the connecting component 31 through the top of the spreader catcher 2, and lowers the hook of the lifting equipment, so that the hook and the spreader catcher 2 are lowered underwater along the connecting component 31; then, guided by the connecting component 31, the spreader catcher 2 moves towards the lifting head 1 along the predetermined path.

[0096] Step 3: Docking and Locking:

[0097] When the lifting device 2 captures the lifting head 1, the lifting head 1 first enters the capture chamber 21 or positioning barrel 25 of the lifting device 2, and then the locking load block 43 of the locking mechanism clamps the lifting head 1. By using the cooperation between the locking load block 43 and the locking surface 112, a stable lock is achieved.

[0098] Step 4: Lifting and hoisting:

[0099] After the spreader catcher 2 successfully catches and locks the lifting head 1, the operator can start the lifting equipment. The hook of the lifting equipment pulls the spreader catcher 2 and the lifting load it catches to lift above the water surface.

[0100] Step 5: Unlock Separation:

[0101] If the separation is achieved on the water surface, after the load is successfully lifted to the designated position, the load is placed stably on the ground working position. The spreader catcher 2 is located on the lifting head 1 above the load. At this time, the traction component 32 is in a non-stressed state. The operator pulls the traction component 32 manually. The traction component 32 drives the first pull rod 41 connected to it and drives the locking load-bearing block 43 through the locking load-bearing shaft 45 to release the connection and locking of the spreader catcher 2 and the lifting head 1. At the same time, the hook of the lifting equipment is activated to lift the spreader catcher 2, thus achieving the separation of the two.

[0102] If the separation is performed underwater, after the load is successfully lifted from the ground to the designated underwater position, the spreader catcher 2 is located on the lifting head 1 above the load. At this time, the load is in the water, and the traction component 32 is in a non-stressed state. The operator pulls the traction component 32 manually, which drives the first pull rod 41 connected to it and, through the locking load-bearing shaft 45, drives the locking load-bearing block 43 to release the connection and locking of the spreader catcher 2 and the lifting head 1. At the same time, the crane is started to lift the catcher, thus separating the two. Subsequently, after the spreader catcher 2 leaves the water surface along the connecting component 31, the spreader catcher 2 is removed from the connecting component 31. The connecting component 31 is appropriately tightened and fixed to the ground anchor point. After the spreader catcher 2 is allowed to air dry naturally, it is placed in the designated position for the next lifting operation.

[0103] In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, in step three, when the lifting head 1 enters the capture chamber 21, conical cavity 211 or positioning barrel 25 of the lifting device 2, it will overcome the locking spring 44 to push open the two locking load blocks 43. Then the two locking load blocks 43 will reset and match the locking surface 112 to ensure precise docking.

[0104] Among them, through the cooperation of the lifting head 1 and the lifting device capture 2, as well as the function of the guide component 3, the underwater blind lifting function of the submersible pump is realized, and direct operation can be carried out without divers or drainage and pool cleaning.

[0105] In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, in steps two, four and five, if the spreader catcher 2 moves, the operator needs to manually pull the traction component 32 to avoid malfunction.

[0106] If the spreader catcher 2 and the lifting head 1 move, the operator needs to manually pull the connecting piece 31 and the traction piece 32 to retract them to the ground to ensure the stability and safety of the lifting process.

[0107] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0108] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hoisting system for underwater blind lifting, characterized by: The utility model relates to a lifting device for lifting load, which comprises a lifting head (1) fixedly installed on the top of the load, a lifting tool catcher (2) detachably connected with the lifting hook of the lifting device and a guide assembly (3). The guide assembly (3) comprises a connecting piece (31) for guiding the lifting tool catcher (2) to be docked and locked with the lifting head (1) and a traction piece (32) for releasing the lifting tool catcher (2) from being docked and locked with the lifting head (1). The lifting tool catcher (2) is movably sleeved on the connecting piece (31) and slides along the connecting piece (31), and the lifting tool catcher (2) is provided with a locking mechanism (4) for catching the lifting head (1). One end of the connecting piece (31) is fixedly connected with the lifting head (1), and one end of the traction piece (32) is fixedly connected with the locking mechanism (4). The locking mechanism (4) comprises a first pull rod (41), a second pull rod (42), a locking bearing block (43), a locking spring (44) and a locking bearing shaft (45).

2. A hoisting system for underwater blind lifting according to claim 1, characterized in that: Two locking bearing shafts (45) are respectively rotatably connected with two sides of the lifting tool catcher (2), two locking bearing blocks (43) for catching the lifting head (1) are respectively fixedly connected with the middle portions of the two locking bearing shafts (45), one end of the first pull rod (41) and one end of the second pull rod (42) are respectively fixedly installed at the two ends of the locking bearing shaft (45), the two second pull rods (42) are fixedly connected through the locking spring (44), and the ends of the two first pull rods (41) away from the locking bearing shaft (45) are fixedly connected with the traction piece (32). The lifting head (1) comprises a conical lifting tool head (11) and a circular support column (12) fixedly installed on the top of the load, 3. A hoisting system for underwater blind lifting according to claim 2, characterized in that: the smaller end of the conical lifting tool head (11) is provided as a connecting end (111), the bottom surface of the conical lifting tool head (11) is provided as a locking surface (112), the connecting end (111) is fixedly connected with one end of the connecting piece (31), the diameter of the locking surface (112) is greater than the diameter of the circular support column (12), and the top of the circular support column (12) is fixedly connected with the middle portion of the locking surface (112); the ends of the two locking bearing blocks (43) close to each other clamp the circular support column (12) and contact the locking surface (112). The inside of the lifting tool catcher (2) is provided with a catching cavity (21) extending to the bottom surface, and the catching cavity (21) comprises a conical cavity (211) located in the inside of the lifting tool catcher (2) and a cylindrical cavity (212) located between the bottom surface of the lifting tool catcher (2) and the conical cavity (211).

4. A hoisting system for underwater blind hitching according to claim 3, characterized in that: The shape of the conical cavity (211) is the same as that of the conical lifting tool head (11), the maximum diameter of the conical cavity (211) is not greater than the diameter of the cylindrical cavity (212), and the diameter of the locking surface (112) is not greater than the diameter of the cylindrical cavity (212). The side of the lifting tool catcher (2) close to the first pull rod (41) is fixedly installed with a limiting block (22), and the traction piece (32) penetrates through the inside of the limiting block (22). ​ The top of the lifting appliance catcher (2) is provided with a through hole (23) in communication with the conical cavity (211), and one end of the connecting piece (31) is fixedly connected with the conical lifting appliance head (11) penetrating through the through hole (23). Both sides of the top of the lifting appliance catcher (2) are fixedly provided with fixed seats (24), and the fixed seats (24) are hung on the lifting hooks of the lifting equipment through auxiliary devices (5).

5. A hoisting system for underwater blind hitching according to claim 3, characterized in that: The lifting appliance catcher (2) comprises a positioning barrel (25), load-bearing side plates (26) and shell auxiliary side plates (27). Two opposite and parallel load-bearing side plates (26) and two opposite and parallel shell auxiliary side plates (27) are fixedly installed around the positioning barrel (25), and the top of each of the two load-bearing side plates (26) is fixedly provided with a fixed seat (24), and the fixed seat (24) is hung on the lifting hook of the lifting equipment through the auxiliary device (5). The inner diameter of the positioning barrel (25) is not less than the diameter of the locking surface (112).

6. A hoisting system for underwater blind hitching according to claim 5, characterized in that: Both sides of the positioning barrel (25) are provided with through grooves (251) for locking the rotation of the load-bearing blocks (43).

7. A hoisting system for underwater blind lifting according to claim 4 or 5, characterized in that: The auxiliary device (5) comprises lifting rings (51) and lifting belts (52). The lifting rings (51) penetrate through the top of the fixed seat (24), and the lifting rings (51) are rotatably connected with the fixed seat (24), and the two ends of the lifting belt (52) are movably sleeved on the top of the two lifting rings (51), and the lifting belt (52) is hung on the lifting hook of the lifting equipment.

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