Underwater self-unhooking hoisting device, underwater hoisting equipment and hoisting system

Abstract

The invention provides an underwater self-unhooking hoisting device, underwater hoisting equipment and a hoisting system, and belongs to the technical field of underwater hoisting, the underwater self-unhooking hoisting device is characterized in that a clamping section and a self-weight section form a lever structure, and the clamping section is clamped with a lifting hook body to limit a lifting frame of an object in a containing cavity; when the lifting hook body and the safety clamp are immersed in first liquid, due to the fact that the density of the floating device is smaller than that of the first liquid, the floating device floats on the liquid level of the first liquid, the self-weight section can rotate and be lifted upwards under lifting of the floating device, and meanwhile the clamping section rotates downwards; the locking state of the safety clamp to the containing cavity is relieved, the object hanging bracket can retreat from the containing cavity to be separated from the hanging hook, the safety clamp can automatically open the containing cavity under the liquid level of the first liquid by utilizing buoyancy of the first liquid to the floating device, unhooking of the hanging hook is completed, the hanging hook can be smoothly recycled underwater, and the underwater hanging difficulty is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of underwater hoisting, and specifically relates to an underwater self-detaching hoisting device, underwater hoisting equipment and a hoisting system. Background Art

[0002] MBR membrane bioreactors are widely used in the field of sewage treatment, and the membrane frames involved need to be regularly hoisted and transferred by electric hoists and other tools for cleaning. Although the safety card of the hook can ensure safety during the lifting process, when the membrane frame is hoisted to the underwater MBR membrane pool, the locking of the safety card will make it difficult to retract the hook, and the underwater hoisting is difficult, which causes great trouble to the operator. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides an underwater self-detaching lifting device.

[0005] A second aspect of the present invention provides an underwater lifting device.

[0006] A third aspect of the present invention provides a lifting system.

[0007] In view of this, according to a first aspect of an embodiment of the present application, an underwater self-detaching lifting device is proposed, comprising:

[0008] A hook body, wherein the hook body is provided with a receiving cavity;

[0009] A safety card, which is rotatably connected to the hook body, comprises a locking section and a deadweight section, and the locking section can be locked with the hook body to lock the accommodating cavity;

[0010] a flotation device, the density of the flotation device being less than the density of the first liquid;

[0011] A connecting rope, a first end of which is connected to the deadweight section, and a second end of which is connected to the floating device;

[0012] Wherein, the underwater self-detaching lifting device lifts the object in the first liquid.

[0013] In a feasible embodiment, a card slot is provided on the hook body; the safety card also includes a mounting portion, the mounting portion is rotatably connected to the hook body through a pin shaft, the locking section is connected to the mounting portion, the deadweight section is connected to the mounting portion, the locking section and the deadweight section form an L-shaped lever structure, the weight of the deadweight section is greater than the weight of the locking section, the locking section is lifted by sinking the deadweight section, so that the locking section is locked with the card slot, thereby locking the accommodating slot.

[0014] In a feasible embodiment, the self-weight section is wrapped around the outside of the hook body; the self-weight section includes a yielding portion and two connecting portions, the first end of the connecting portion is connected to the mounting portion, the two ends of the yielding portion are respectively connected to the second ends of the two connecting portions, there is a gap between the connecting rope and the hook body, and the first end of the connecting rope is fixed on the yielding portion.

[0015] In a feasible implementation, the volume of the floating device matches the weight of the deadweight section; the floating device is hollow inside, and a folding section is provided on the floating device, and the volume of the floating device is adjusted by the folding section.

[0016] In a feasible implementation manner, the underwater self-unhooking lifting device further includes:

[0017] An exhaust port, which is arranged on the floating device and is used to discharge the gas in the floating device;

[0018] The plug is detachably arranged on the exhaust port.

[0019] In a feasible implementation manner, the underwater self-unhooking lifting device further includes:

[0020] The pulley assembly is provided with a hook body, and the hook body is rotatably connected with the pulley assembly.

[0021] In a feasible implementation manner, the underwater self-unhooking lifting device further includes:

[0022] A limit cover is arranged on the side wall of the pulley assembly, the limit cover is located above the hook body, the limit cover is arranged on the outside of the floating device, and the floating device can move in the limit cover along the height direction of the limit cover;

[0023] The connecting rope passes through the limiting cover, and at least a part of the limiting cover is immersed in the first liquid.

[0024] In a feasible implementation manner, the underwater self-unhooking lifting device further includes:

[0025] A filter port, the filter port is arranged on the limit cover;

[0026] The filter device covers the filter port and is detachably connected to the limiting cover.

[0027] According to a second aspect of an embodiment of the present application, an underwater lifting equipment is proposed, comprising: an underwater self-detaching lifting device as described in any of the above technical solutions.

[0028] According to a third aspect of an embodiment of the present application, a lifting system is proposed, comprising: an underwater lifting device as described in any of the above technical solutions.

[0029] Compared with the prior art, the underwater self-unhooking hoisting device, underwater hoisting equipment and hoisting system of the present application have the following beneficial effects:

[0030] The underwater self-detaching lifting device provided in the embodiment of the present application includes a hook body, a safety card, a floating device and a connecting rope. The hook body is used to lift an object in a first liquid. The locking section and the deadweight section constitute a lever structure. The locking section restricts the hanger of the object in the accommodating chamber by locking with the hook body. The deadweight section is connected to the floating device through a connecting rope. When the hook body and the safety card are immersed in the first liquid, since the density of the floating device is less than the density of the first liquid, the floating device floats on the liquid surface of the first liquid. The deadweight section will rotate upward and be lifted up under the pull of the floating device, and at the same time, the locking section will rotate downward to release the locking state of the safety card on the accommodating chamber, so that the hanger of the object can be withdrawn from the accommodating chamber and separated from the hook. By utilizing the buoyancy of the first liquid on the floating device, the safety card can automatically open the accommodating chamber below the liquid surface of the first liquid, complete the hook unhooking, and enable the hook to be smoothly recovered underwater, thereby reducing the difficulty of underwater lifting and improving the efficiency of underwater lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 A schematic structural diagram of an underwater self-unhooking lifting device from a first angle according to an embodiment of the present application;

[0033] Figure 2 A schematic structural diagram of an underwater self-detaching lifting device from a second angle according to an embodiment of the present application;

[0034] Figure 3 A schematic structural diagram of a floating device of an underwater self-detaching lifting device according to an embodiment of the present application;

[0035] Figure 4 A schematic structural diagram of a limit cover of an underwater self-detaching lifting device according to an embodiment of the present application;

[0036] in, Figures 1 to 4 The corresponding relationship between the reference numerals and component names in the figure is:

[0037] 11. Hook body; 12. Safety card; 13. Floating device; 14. Connecting rope; 15. Folding section; 16. Exhaust port; 17. Plug; 18. Pulley assembly; 19. Limiting cover; 20. Filter port; 21. Filter device;

[0038] 121, locking section; 122, deadweight section; 123, installation section;

[0039] 1221. yielding portion; 1222. connecting portion. DETAILED DESCRIPTION

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0044] like Figure 1 and Figure 2As shown, according to an embodiment of the present application, an underwater self-detaching lifting device is proposed, comprising: a hook body 11, a safety card 12, a floating device 13 and a connecting rope 14; a accommodating chamber is provided on the hook body 11; the safety card 12 is rotatably connected to the hook body 11, the safety card 12 comprises a locking section 121 and a deadweight section 122, the locking section 121 can be locked with the hook body 11 to lock the accommodating chamber; the density of the floating device 13 is less than the density of the first liquid; the first end of the connecting rope 14 is connected to the deadweight section 122, and the second end of the connecting rope 14 is connected to the floating device 13; wherein, the underwater self-detaching lifting device suspends objects in the first liquid.

[0045] The underwater self-detaching lifting device provided in the embodiment of the present application includes a hook body 11, a safety card 12, a floating device 13 and a connecting rope 14. The hook body 11 is used to lift an object in a first liquid. The locking section 121 and the deadweight section 122 form a lever structure. The locking section 121 restricts the hanger of the object in the accommodating cavity by locking with the hook body 11; the deadweight section 122 is connected to the floating device 13 by the connecting rope 14. When the hook body 11 and the safety card 12 are immersed in the first liquid, since the density of the floating device 13 is less than that of the first liquid, the floating device 13 is connected to the hook body 11. The density of the first liquid is such that the floating device 13 floats on the surface of the first liquid. The deadweight section 122 is lifted and rotated upward by the floating device 13, and the locking section 121 is rotated downward at the same time, releasing the locking state of the safety card 12 on the accommodating chamber, so that the object hanger can be withdrawn from the accommodating chamber and separated from the hook. The buoyancy of the first liquid on the floating device 13 is utilized to enable the safety card 12 to automatically open the accommodating chamber under the surface of the first liquid, complete the unhooking of the hook, and enable the hook to be smoothly recovered underwater, thereby reducing the difficulty of underwater lifting and improving the efficiency of underwater lifting.

[0046] It is understandable that after the insurance card 12 is immersed in the first liquid, it will also be affected by the buoyancy of the first liquid, but it will still remain in a drooping state, so that when the floating device 13 applies a small pulling force to the self-weight section 122, the self-weight section 122 can be lifted, so that the insurance card 12 releases the locked state of the accommodating cavity.

[0047] like Figure 1 As shown, in a feasible embodiment, a card slot is provided on the hook body 11; the safety card 12 also includes a mounting portion 123, the mounting portion 123 is rotatably connected to the hook body 11 through a pin shaft, the locking section 121 is connected to the mounting portion 123, and the deadweight section 122 is connected to the mounting portion 123, the locking section 121 and the deadweight section 122 form an L-shaped lever structure, the weight of the deadweight section 122 is greater than the weight of the locking section 121, and the locking section 121 is lifted by the drooping of the deadweight section 122, so that the locking section 121 is locked with the card slot to lock the accommodating slot.

[0048] In this technical solution, the locking section 121 and the deadweight section 122 use the rotation axis of the mounting portion 123 as the swing axis of the lever structure. Since the weight of the deadweight section 122 is greater than the weight of the locking section 121, in a natural state, the deadweight section 122 sags to lift the locking section 121, and the locking section 121 is locked with the slot on the inner wall of the hook body 11 to lock the accommodating cavity, preventing the object hanger from detaching from the hook body 11, thereby ensuring the stability of the hook in lifting the object; when the object is lifted into place and the hook needs to be recovered, the floating device 13 pulls the underwater deadweight section 122 upward, and the end of the deadweight section 122 away from the mounting portion 123 is rotated upward and lifted, and the end of the locking section 121 away from the mounting portion 123 is rotated downward, so that the locking portion is separated from the slot, and the safety card 12 automatically opens the accommodating cavity under the buoyancy of the floating device 13, so that the accommodating cavity is opened, and the hook can be smoothly recovered.

[0049] In some examples, such as Figure 1 When the accommodating chamber needs to be locked, under the action of the gravity of the deadweight section 122, the safety card 12 as a whole rotates clockwise around the pin shaft, and the locking section 121 is lifted up and locked with the slot; when the hook body 11 and the safety card 12 device are immersed in the first liquid, the floating device 13 pulls the deadweight section 122 to lift the deadweight section 122, so that the safety card 12 as a whole rotates counterclockwise around the pin shaft, and the locking section 121 rotates downward and withdraws from the slot, releasing the locking state between the safety card 12 and the slot.

[0050] like Figure 2 As shown, in a feasible embodiment, the self-weight section 122 is wrapped around the outside of the hook body 11; the self-weight section 122 includes a yielding portion 1221 and two connecting portions 1222, the first end of the connecting portion 1222 is connected to the mounting portion 123, the two ends of the yielding portion 1221 are respectively connected to the second ends of the two connecting portions 1222, there is a gap between the connecting rope 14 and the hook body 11, and the first end of the connecting rope 14 is fixed on the yielding portion 1221.

[0051] In this technical solution, the self-weight section 122 is wound around the outside of the hook body 11, and the connecting rope 14 is fixed on the yielding portion 1221. By creating a gap between the yielding portion 1221 and the surface of the hook body 11, the self-weight section 122 is prevented from contacting the hook body 11, thereby preventing the connecting rope 14 from being squeezed and worn between the hook body 11 and the self-weight section 122, thereby extending the service life of the connecting rope 14 and preventing the self-weight section 122 from rotating and getting stuck, thereby ensuring the flexibility of the self-weight section 122 in rotating, thereby ensuring the flexibility and timeliness of the opening and closing of the safety card 12.

[0052] Furthermore, the deadweight section 122 is U-shaped and wound around the outside of the hook body 11 , and there is a gap between the connecting rope 14 and the hook body 11 to prevent the connecting rope 14 and the hook body 11 from contacting and wearing each other.

[0053] In a feasible implementation, the volume of the floating device 13 matches the weight of the deadweight section 122 .

[0054] In this technical solution, the volume of the floating device 13 matches the load of the insurance card 12 to ensure that the buoyancy of the floating device 13 is greater than the gravity of the deadweight section 122, so that the deadweight section 122 can be lifted upward under the traction of the connecting rope 14, so that the insurance card 12 is opened.

[0055] Furthermore, the floating device 13 is a floating ball, which has a simple structure and is easy to adjust the volume.

[0056] It is understandable that the volume of the floating device 13 determines the buoyancy of the first liquid on the floating device 13 , and thus the insurance card 12 with different loads can be matched by adjusting the volume of the floating device 13 .

[0057] like Figure 3 As shown, in a feasible implementation manner, the interior of the floating device 13 is hollow, and a folding section 15 is provided on the floating device 13 , and the volume of the floating device 13 is adjusted by the folding section 15 .

[0058] In this technical solution, the interior of the floating device 13 is hollow, and the volume of the floating device 13 is changed by compression and expansion of the folding section 15; when the folding section 15 is compressed, the volume of the floating device 13 is reduced, and the overall density is increased, so that it can adapt to the self-weight section 122 with a smaller weight; when the folding section 15 is expanded, the volume of the floating device 13 is increased, and the overall density is reduced, so that it can adapt to the self-weight section 122 with a larger weight, thereby ensuring that the insurance card 12 can be punched by the floating device 13 and ensuring the smooth recovery of the hook.

[0059] Furthermore, the folded section 15 is disposed on the side wall of the floating device 13 , and the folded section 15 is in a corrugated shape. The volume of the floating device 13 can be changed by adjusting the length of the floating device 13 .

[0060] like Figure 3 As shown, in a feasible embodiment, the underwater self-unhooking lifting device also includes: an exhaust port 16 and a plug 17; the exhaust port 16 is arranged on the floating device 13, and the exhaust port 16 is used to discharge the gas in the floating device 13; the plug 17 is detachably arranged on the exhaust port 16.

[0061] In this technical solution, the exhaust port 16 is used to exhaust the gas in the floating device 13 when the floating device 13 is compressed or to replenish the gas in the floating device 13 when the floating device 13 is expanded; the plug 17 is used to block the exhaust port 16 to prevent the floating device 13 from escaping gas, which is conducive to maintaining the volume of the floating device 13 unchanged after adjustment.

[0062] Furthermore, the plug 17 is sealedly connected to the exhaust port 16 to prevent the floating device 13 from leaking air and ingress of water.

[0063] like Figure 1 and Figure 2 As shown, in a feasible implementation manner, the underwater self-unhooking lifting device further includes: a pulley assembly 18, the hook body 11 is disposed on the pulley assembly 18, and the hook body 11 is rotatably connected to the pulley assembly 18.

[0064] In this technical solution, the hook body 11 is installed at the bottom end of the pulley assembly 18, so that the hook body 11 can be driven to move by the lifting and lowering of the pulley assembly 18 to lift the object hanger underwater; the hook body 11 is rotatably connected to the pulley assembly 18, and the hook body 11 is rotated so that the hanger can be smoothly withdrawn from the accommodating cavity of the hook body 11 after the safety card 12 is opened. By improving the flexibility of the hook body 11, the difficulty of hook recovery is reduced and the recovery efficiency of the hook is improved.

[0065] like Figure 1 and Figure 2 As shown, in a feasible embodiment, the underwater self-unhooking lifting device also includes: a limit cover 19, the limit cover 19 is arranged on the side wall of the pulley assembly 18, the limit cover 19 is located above the hook body 11, the limit cover 19 is arranged on the outside of the floating device 13, and the floating device 13 can move in the limit cover 19 along the height direction of the limit cover 19; wherein, the connecting rope 14 passes through the limit cover 19.

[0066] In this technical solution, the limiting cover 19 is fixed on the pulley assembly 18 and is located above the hook body 11. The floating device 13 is movably arranged in the limiting cover 19. After the connecting rope 14 is connected to the floating device 13, it passes through the bottom of the limiting cover 19 and is connected to the deadweight section 122. When hoisting objects in water, the limiting cover 19 is immersed in the first liquid along with the pulley assembly 18 and the hook body 11, and the floating device 13 floats on the liquid surface of the first liquid. The limiting cover 19 is used to limit the floating device 13, so that the position of the floating device 13 on the first liquid surface is relatively fixed, so that the connecting rope 14 can maintain a relatively vertical state, thereby reducing the component force generated by the floating device 13 when pulling the deadweight section 122, and reducing the difficulty of the floating device 13 in pulling the deadweight section 122.

[0067] Furthermore, the limiting cover 19 is located directly above the yielding portion 1221 , and the floating device 13 is disposed along the height direction of the limiting cover 19 . The floating device 13 can move along the height direction of the limiting cover 19 .

[0068] In a feasible implementation manner, at least a portion of the limiting cover 19 is immersed in the first liquid.

[0069] In this technical solution, at least part of the limiting cover 19 is immersed in the first liquid to ensure that the floating device 13 in the limiting cover 19 is subject to the buoyancy provided by the first liquid, thereby relying on the buoyancy of the floating device 13 to pull the self-weight section 122 upward to open the safety card 12.

[0070] like Figure 4 As shown, in a feasible embodiment, the underwater self-unhooking lifting device also includes: a filter port 20 and a filter device 21, the filter port 20 is arranged on the limit cover 19; the filter device 21 covers the filter port 20, and the filter device 21 is detachably connected to the limit cover 19.

[0071] In this technical solution, the first liquid enters the limiting cover 19 from the filter port 20, so that the floating device 13 contacts the first liquid. A detachable filtering device 21 is provided on the filtering port 20 to prevent impurities in the first liquid from entering the limiting cover 19, causing the movement of the floating device 13 to be stuck. This ensures that after the limiting cover 19 is immersed in the first liquid, the floating device 13 quickly produces a relative displacement with the limiting cover 19 under the action of the buoyancy of the first liquid, thereby lifting the self-weight section 122. At the same time, by disassembling the filtering device 21, it is convenient to clean the filtering device 21, and it is also convenient to take out the skin device for volume adjustment, which is easy to use.

[0072] According to a second aspect of the present application, an underwater lifting equipment is proposed, comprising: an underwater self-detaching lifting device as in any one of the above technical solutions.

[0073] The underwater lifting equipment provided in the embodiment of the present application includes an underwater self-unhooking lifting device as in any of the above-mentioned technical solutions. Therefore, the underwater lifting equipment has all the beneficial effects of the underwater self-unhooking lifting device of the above-mentioned technical solutions, which will not be elaborated here.

[0074] Specifically, the underwater lifting equipment may include an electric hoist.

[0075] According to a third aspect of the present application, a lifting system is proposed, comprising: an underwater lifting device as described in any one of the above technical solutions.

[0076] The lifting system provided in the embodiment of the present application includes the underwater lifting equipment of any of the above-mentioned technical solutions, so the lifting system has all the beneficial effects of the underwater lifting equipment of the above-mentioned technical solutions, which will not be elaborated here.

[0077] Specifically, the lifting system may include a crane system.

[0078] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An underwater self-detaching lifting device, characterized in that: The underwater self-unhooking hoisting device comprises: A hook body, wherein the hook body is provided with a receiving cavity; A safety card, the safety card is rotatably connected to the hook body, the safety card comprises a locking section and a deadweight section, the locking section can be locked with the hook body to lock the accommodating cavity; a flotation device having a density less than a density of the first liquid; A connecting rope, wherein a first end of the connecting rope is connected to the deadweight section, and a second end of the connecting rope is connected to the floating device.

2. The underwater self-unhooking lifting device according to claim 1, characterized in that: A card slot is provided on the hook body; the safety card also includes a mounting portion, the mounting portion is rotatably connected to the hook body through a pin shaft, the locking section is connected to the mounting portion, the deadweight section is connected to the mounting portion, the locking section and the deadweight section form a lever structure, the weight of the deadweight section is greater than the weight of the locking section, the locking section is lifted by sinking the deadweight section, so that the locking section is locked with the card slot, and the accommodating slot is locked.

3. The underwater self-unhooking lifting device according to claim 2, characterized in that: The self-weight section is wound around the outside of the hook body; the self-weight section includes a yielding portion and two connecting portions, the first end of the connecting portion is connected to the mounting portion, the two ends of the yielding portion are respectively connected to the second ends of the two connecting portions, there is a gap between the connecting rope and the hook body, and the first end of the connecting rope is fixed on the yielding portion.

4. The underwater self-unhooking lifting device according to claim 1, characterized in that: The volume of the floating device matches the weight of the deadweight section; the interior of the floating device is hollow, and a folding section is provided on the floating device, and the volume of the floating device is adjusted by the folding section.

5. The underwater self-detaching lifting device according to claim 4, characterized in that: The underwater self-unhooking hoisting device also includes: An exhaust port, the exhaust port being arranged on the floating device and used for exhausting the gas in the floating device; A plug is detachably arranged on the exhaust port.

6. The underwater self-unhooking lifting device according to claim 1, characterized in that: The underwater self-unhooking hoisting device also includes: A pulley assembly, the hook body is arranged on the pulley assembly, and the hook body is rotatably connected to the pulley assembly.

7. The underwater self-unhooking lifting device according to claim 6, characterized in that: The underwater self-unhooking hoisting device also includes: A limit cover, wherein the limit cover is arranged on the side wall of the pulley assembly, the limit cover is located above the hook body, the limit cover is arranged on the outside of the floating device, and the floating device can move in the limit cover along the height direction of the limit cover; Wherein, the connecting rope passes through the limiting cover, and at least a part of the limiting cover is immersed in the first liquid.

8. The underwater self-detaching lifting device according to claim 7, characterized in that: The underwater self-unhooking hoisting device also includes: A filter port, wherein the filter port is arranged on the limiting cover; A filter device is provided, wherein the filter device covers the filter port, and the filter device is detachably connected to the limit cover.

9. An underwater lifting equipment, characterized in that: It comprises the underwater self-unhooking lifting device as described in any one of claims 1 to 9.

10. A hoisting system, characterized in that: Comprising the underwater lifting equipment as described in claim 10.

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