Gravity decoupling device for underwater airbag buoyancy salvage

Abstract

A gravity decoupling device for underwater airbag buoyancy salvage, comprising a lifting lug seat. Pin holes are provided on both of the two clamping plates. A pin shaft that can horizontally penetrate through the hook accommodating groove is movably inserted into the pin holes. The left side of the mounting plate is connected with a cylinder body. A piston is arranged in the cylinder body. The left end of the pin shaft passes through the through hole and extends into the cylinder body and is connected to the center of the right end face of the piston. An annular oil inlet groove is formed on the outer circumferential surface of the right end of the piston. A compression spring is arranged between the left end face of the piston and the left end face in the cylinder body. The beneficial effects of the present invention are as follows: The present invention is particularly suitable for underwater decoupling and can also be used on land. It can ensure the locking of the pin state, prevent accidental underwater decoupling actions, and decoupling devices with different cylinder diameters and pin shaft size series can be designed, and the product structure has good expandability.

Description

Technical Field

[0001] The present invention relates to a gravity decoupling device for underwater airbag buoyancy salvage. Background Art

[0002] Currently, in land hoisting and lifting equipment, decouplers are often used. There are many decouplers of various styles, and most of them use mechanical pull rods or hydraulic methods to achieve rapid decoupling. Currently, in underwater construction, especially in steel structure installation or salvage engineering construction, underwater decouplers are also used. Due to the complex underwater conditions, using the mechanical pull rod method is likely to cause accidental actions, resulting in decoupling and crane accidents. Applying the hydraulic decoupler used on land directly underwater will cause decoupler failures due to water pressure difference and the sealing problem between hydraulic oil and water, and cannot ensure its smooth operation. The working stability and reliability of the customers using it are relatively poor. A marine engineering enterprise once used a mechanical cable-type decoupler during underwater submarine pipeline installation in the North Sea. Due to the too long soft cable, the friction force was too large when pulling the soft cable, and combined with corrosion caused by immersion in seawater, it simply could not pull the cable, and the decoupler could not be opened. The method of directly pulling the cable was not adopted either because it was considered that the cable might be entangled with other equipment due to drifting with the sea current and waves. Later, a hydraulic cylinder-type decoupler used in conventional truck cranes on land was adopted. When diving to a certain depth, the decoupler accidentally moved and decoupled due to the reduction of the pressure difference between the oil pressure and the external water pressure, and the submarine pipeline sank at a non-installation location. Then, the method of increasing the oil pressure was tried, but sealing problems occurred, resulting in oil pressure leakage and seawater pollution, and it could not adapt to long-term hoisting operations. The above usage experiences prove that various decouplers used on land have various disadvantages when applied underwater, and it is necessary to design an improved underwater decoupler based on actual experience. Summary of the Invention

[0003] To solve the above technical deficiencies, the present invention provides a gravity decoupling device for underwater airbag buoyancy salvage, which can ensure the locking of the pin state, prevent accidental underwater decoupling actions, and is stable and reliable.

[0004] The present invention is achieved by the following measures:

[0005] A gravity decoupling device for underwater airbag buoyancy salvage, comprising a lifting lug seat. On both the left and right sides of the lifting lug seat, there are integrally extended downward clamping plates. There is a hook accommodation groove left between the two clamping plates. On both clamping plates, there are pin holes. A pin shaft that can horizontally penetrate the hook accommodation groove is movably inserted through the pin holes. On the left side of the clamping plate on the left side of the lifting lug seat, there is an installation disk connected. On the left side of the installation disk, there is a cylindrical cylinder body that extends horizontally left and right and is hollow inside. Inside the cylinder body, there is a piston that can slide left and right within the cylinder body. There is a through hole in the center of the installation disk. The left end of the pin shaft passes through the through hole and extends into the cylinder body and is connected to the center of the right end face of the piston. The inner diameter of the cylinder body and the diameter of the right end face of the piston are both larger than the inner diameter of the through hole. There is sealed sliding contact between the outer circumferential surface of the piston and the inner wall surface of the cylinder body, and between the outer circumferential surface of the pin shaft and the inner wall surface of the through hole. On the outer circumferential surface of the right end of the piston, there is an annular oil inlet groove. The oil inlet groove communicates with the left end face of the installation disk. On the right side wall of the cylinder body, there is a pin-pulling oil inlet connected to the oil inlet groove. Between the left end face of the piston and the left inner end face of the cylinder body, there is a compression spring, and on the left end face of the cylinder body, there is a drain or pin-inserting oil inlet.

[0006] On the left side of the left end face of the above-mentioned piston, there is connected a section of limiting cylinder. The diameter of the limiting cylinder is smaller than the diameter of the piston. The compression spring is sleeved outside the limiting cylinder.

[0007] From the center of the left end face of the above-mentioned pin shaft, there is integrally extended leftward a positioning pin. The diameter of the positioning pin is smaller than the diameter of the pin shaft. The positioning pin penetrates into the piston from the center of the right end face of the piston and is fixed by a locking nut. A sealing ring is sleeved on the positioning pin.

[0008] The right end face of the above-mentioned installation disk is closely attached to the surface of the clamping plate. Around the through hole at the center of the left end face of the installation disk, there is a convex platform protruding leftward. The right end opening of the cylinder body is sleeved on the convex platform. The right end of the cylinder body has a flanging. The flanging of the cylinder body, the installation disk and the clamping plate are fixed together by bolts.

[0009] Between the outer circumferential surface of the above-mentioned piston and the inner wall surface of the cylinder body, and between the outer circumferential surface of the pin shaft and the inner wall surface of the through hole, there are both oil seals provided.

[0010] On the upper part of the above-mentioned lifting lug seat, there is a lifting hole provided.

[0011] The beneficial effects of the present invention are as follows: The present invention is particularly suitable for underwater decoupling and can also be used on land. It can ensure the locking of the pin state, prevent accidental underwater decoupling actions, and perform limit through a mechanical structure, and the pin-pulling action is reliable; the pressure difference between the inner and outer cavities of the hydraulic cylinder is small, the sealing device is reliable, and the risk of oil leakage and pollution is reduced; through a long pipeline, the pin-inserting and pin-pulling operations in remote or deep-water areas can be realized; decoupling devices with different cylinder diameters and pin shaft sizes can be designed, and the product structure has good expandability. Description of the Drawings

[0012] Figure 1 This is a schematic structural view of the state where the pin shaft is inserted in the present invention.

[0013] Figure 2 This is a schematic structural view of the state where the pin shaft is pulled out in the present invention.

[0014] Among them: 1 lifting lug seat, 2 mounting plate, 3 locking nut, 4 cylinder barrel, 5 compression spring, 6 piston, 7 bolt, 8 pin shaft, 9 sealing ring, 10 oil seal, 11 positioning pin, 12 drain or pin insertion oil inlet, 13 clamping plate, 14 pin pulling oil inlet, 15 limiting cylinder. Specific embodiments

[0015] The following further describes the present invention in detail with reference to the accompanying drawings:

[0016] According to the requirements for the underwater release operation of the buoyancy hanging point, the present invention designs a gravity decoupling device for underwater airbag buoyancy salvage. Its principle is to use a hydraulic cylinder to pull out the pin shaft 8 underwater, so as to disconnect the connection between the buoyancy aid and the lifting lug and achieve decoupling. The present invention takes into account the dual effects of the underwater application water pressure and the internal hydraulic pressure of the hydraulic cylinder, optimizes the structure, uses the spring force to ensure the buckling pressure of the hook, ensures the initial positioning of the hook, and uses the hydraulic pressure to achieve a large thrust to pull out the pin shaft 8 to achieve the purpose of automatic decoupling.

[0017] As Figure 1 、 2 shown, a gravity decoupling device for underwater airbag buoyancy salvage includes a lifting lug seat 1. On both the left and right sides of the lifting lug seat 1, clamping plates 13 extend downward integrally. There is a hook receiving groove between the two clamping plates 13. Pin holes are provided on both clamping plates 13, and a pin shaft 8 that can horizontally penetrate the hook receiving groove is movably inserted through the pin holes. On the left side of the clamping plate 13 on the left side of the lifting lug seat 1, a mounting plate 2 is connected. On the left side of the mounting plate 2, a cylindrical cylinder barrel 4 that extends horizontally left and right and is hollow inside is connected. Inside the cylinder barrel 4, a piston 6 that can slide left and right in the cylinder barrel 4 is provided. A through hole is provided in the center of the mounting plate 2. The left end of the pin shaft 8 passes through the through hole and extends into the cylinder barrel 4 and is connected to the center of the right end face of the piston 6. The inner diameter of the cylinder barrel 4 and the diameter of the right end face of the piston 6 are both larger than the inner diameter of the through hole. The outer circumferential surface of the piston 6 and the inner wall surface of the cylinder barrel 4 and the outer circumferential surface of the pin shaft 8 and the inner wall surface of the through hole are all in sealed sliding contact. A circular oil inlet groove is formed on the outer circumferential surface of the right end of the piston 6. The oil inlet groove communicates with the left end face of the mounting plate 2. A pin pulling oil inlet 14 that communicates with the oil inlet groove is provided on the right end side wall of the cylinder barrel 4. A compression spring 5 is provided between the left end face of the piston 6 and the left inner end face of the cylinder barrel 4, and a drain or pin insertion oil inlet 12 is provided on the left end face of the cylinder barrel 4.

[0018] A limiting cylinder 15 is connected to the left side of the left end face of the piston 6. The diameter of the limiting cylinder 15 is smaller than that of the piston 6. The compression spring 5 is sleeved outside the limiting cylinder 15. A positioning pin 11 extends integrally to the left from the center of the left end face of the pin shaft 8. The diameter of the positioning pin 11 is smaller than that of the pin shaft 8. The positioning pin 11 penetrates into the inside of the piston 6 from the center of the right end face of the piston 6 and is fixed by a locking nut 3. A sealing ring 9 is sleeved on the positioning pin 11. The right end face of the mounting disc 2 is closely attached to the surface of the clamping plate 13. A convex platform protruding to the left is arranged around the through hole at the center of the left end face of the mounting disc 2. The right end opening of the cylinder barrel 4 is sleeved on the convex platform. An outward flange is provided at the right end of the cylinder barrel 4. The outward flange of the cylinder barrel 4, the mounting disc 2 and the clamping plate 13 are fixed together by bolts 7. Oil seals 10 are provided between the outer circumferential surface of the piston 6 and the inner wall surface of the cylinder barrel 4 and between the outer circumferential surface of the pin shaft 8 and the inner wall surface of the through hole. A hoisting hole is provided in the upper part of the lifting lug seat 1 for connecting hoisting at the upper part. The mounting disc 2 is mounted on the lifting lug seat 1, and the oil seal 10 seals the gap between it and the pin shaft 8 and plays a guiding role at the same time. The locking nut 3 locks the pin shaft 8 and the piston 6. The compression spring 5 is installed at the bottom of the cylinder barrel 4, and the other end presses on the piston 6 to ensure that the piston 6 is in the pin-inserted state. The piston 6 drives the pin shaft 8 to move in the cylinder barrel 4 and is always pushed by the compression spring 5 towards the pin-inserted state. There is a limiting cylinder 15 structure at its bottom. The outer circle of the limiting cylinder 15 plays a guiding role for the compression spring 5. When the piston 6 is pushed by the oil pressure at the pin-removing oil inlet 14 to remove the pin, the limiting cylinder 15 moves to the bottom of the cylinder barrel 4, restricting the continuous movement of the piston 6, so as to accurately reach the pin-removing position. The sealing ring 9 seals the oil in the two cavities. If the internal and external pressures are relatively large, 2 or 3 sealing rings 9 can be used for sealing. This is a static seal without movement. The oil seal 10 seals the movement of the piston 6 in the cylinder barrel 4 with double-sided sealing.

[0019] When underwater, when the pin-removing oil inlet 14 and the drain or pin-inserting oil inlet 12 are in a non-oil supply state, the compression spring 5 presses the piston 6 tightly to the right side, pushing the pin shaft 8 into the pin-inserting state or the locking state. The drain or pin-inserting oil inlet 12 is normally open, and external water enters the inside of the cylinder body 4, reducing the pressure difference on both sides of the pin shaft 8, ensuring the spring force of the compression spring 5, and preventing the pin shaft 8 from accidentally moving to remove the pin. When it is necessary to remove the pin, high-pressure hydraulic oil is injected into the pin-removing oil inlet 14. The oil pushes the piston 6 to move to the left side, the compression spring 5 is further compressed, the piston 6 drives the pin shaft 8 to move towards the bottom of the cylinder body 4 together, and the water in the cavity flows out from the drain or pin-inserting oil inlet 12. The pin shaft 8 is withdrawn from the pin shaft hole of the lifting lug seat 1. When the limiting cylinder 15 on the right side of the piston 6 reaches the bottom of the cylinder body 4 and cannot move and is restricted, the pin-removing action ends, and the lifting lugs on both sides of the lifting lug seat 1 are opened. If there is no limiting cylinder 15 on the right side of the piston 6, the piston 6 will continue to move to the right side, causing the spring to be compressed to the coiled state, with a greater pressure, a higher required hydraulic pressure, and a greater pressure difference between the inside and outside of the cylinder, which is not conducive to pressure sealing and there is a risk of structural strength overload.

[0020] When on land, since there is no problem of pressure difference between water and hydraulic oil, the drain or pin-inserting oil inlet 12 can be used as the hydraulic oil inlet for auxiliary pin insertion. If the compression spring 5 is still used, its drain or pin-inserting oil inlet 12 is only used when a greater pin-inserting force is required. Generally, the pin insertion can be achieved by the reaction force of the compression spring 5. If the compression spring 5 is not used, the oil inlet and outlet of the pin-removing oil inlet 14 and the drain or pin-inserting oil inlet 12 alternate, realizing the function of a double-acting hydraulic cylinder, and both pin insertion and removal are controlled hydraulically.

[0021] The above are only the preferred embodiments of this patent. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of this patent technology, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of this patent.

Claims

1. A gravity decoupling device for underwater airbag buoyancy salvage, characterized in that: It includes a lug seat. On both the left and right sides of the lug seat, there are integrally extended downward clamping plates. There is a hook accommodating groove left between the two clamping plates. On both clamping plates, there are pin holes. A pin shaft that can horizontally penetrate the hook accommodating groove is movably inserted into the pin holes. On the left side of the clamping plate on the left side of the lug seat, there is an installation disc connected. On the left side of the installation disc, there is a cylindrical cylinder body that extends horizontally left and right and is hollow inside. Inside the cylinder body, there is a piston that can slide left and right within the cylinder body. There is a through hole in the center of the installation disc. The left end of the pin shaft passes through the through hole and extends into the cylinder body and is connected to the center of the right end face of the piston. The inner diameter of the cylinder body and the diameter of the right end face of the piston are both larger than the inner diameter of the through hole. There is a sealed sliding contact between the outer circumferential surface of the piston and the inner wall surface of the cylinder body and between the outer circumferential surface of the pin shaft and the inner wall surface of the through hole. On the outer circumferential surface of the right end of the piston, there is an annular oil inlet groove. The oil inlet groove communicates with the left end face of the installation disc. On the right end side wall of the cylinder body, there is a pin-pulling oil inlet connected to the oil inlet groove. Between the left end face of the piston and the left inner end face of the cylinder body, there is a compression spring, and there is a drain or pin-pulling oil inlet on the left end face of the cylinder body; on the left side of the left end face of the piston, there is connected a section of a limiting cylinder. The diameter of the limiting cylinder is smaller than the diameter of the piston. The compression spring is sleeved outside the limiting cylinder; from the center of the left end face of the pin shaft, there is integrally extended leftward a positioning pin. The diameter of the positioning pin is smaller than the diameter of the pin shaft. The positioning pin penetrates into the piston from the center of the right end face of the piston and is fixed by a locking nut. A sealing ring is sleeved on the positioning pin; the right end face of the installation disc closely adheres to the surface of the clamping plate. Around the through hole at the center of the left end face of the installation disc, there is a convex platform protruding leftward. The right end opening of the cylinder body is sleeved on the convex platform. The right end of the cylinder body has a flanged edge. The flanged edge of the cylinder body, the installation disc, and the clamping plate are fixed together by bolts.

2. The gravity decoupling device for underwater airbag buoyancy salvage according to claim 1, characterized in that: There are oil seals between the outer circumferential surface of the piston and the inner wall surface of the cylinder body and between the outer circumferential surface of the pin shaft and the inner wall surface of the through hole.

3. The gravity decoupling device for underwater airbag buoyancy salvage according to claim 1, wherein: There is a hoisting hole provided on the upper part of the lug seat.

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