Stepwise loadable underwater equipment with anti-loosening device

Abstract

The present application relates to a kind of underwater equipment with anti-loosening device of step loading, for the underwater equipment needing remote hydraulic drive and state retention, the target working position of this kind of equipment can be locked, and ensure that step loading and action can be carried out during unlocking process.The underwater equipment drive structure includes drive block, drive liquid cylinder, anti-loosening device, limit indicating rod, pressure injection device, unit structure is equipped with locking liquid path, unlocking main liquid path, valve is also contained on liquid path, unlocking main liquid path includes three unlocking branch liquid paths, one-way valve or pressure relief valve is also equipped on part branch liquid path, in addition, including various cavities, sealing element etc.The underwater equipment drive structure is hydraulically operated, simple structure, is equipped with hydraulic unlocking, spring reset anti-loosening device, can effectively ensure the position locking of underwater oil and gas equipment drive structure, in addition, drive liquid cylinder and the unlocking liquid path step loading of anti-loosening device, further improve the reliability and operation stability of the drive structure.

Description

TECHNICAL FIELD

[0001] The present application relates to marine oil and gas drilling equipment, in particular, to a step-by-step loadable underwater equipment driving structure with an anti-loosening device. BACKGROUND

[0002] With the gradual depletion of land oil and gas resources, the pace of marine oil and gas development is gradually accelerated, and it is gradually expanded from shallow sea to deep sea. Marine underwater oil and gas drilling equipment mainly includes underwater Christmas tree, underwater wellhead, tubing / casing hanger, manifold, riser, blowout preventer and various hydraulic connectors, etc., which is an important tool for marine oil and gas exploration and development. With the increase of water depth, the environmental conditions become more severe, the equipment needs to withstand multiple corrosion and forces, and the equipment operation needs to be remotely controlled by composite electro-hydraulic control mode, so the development cost is high, the equipment failure risk is large, and the drilling equipment requires high reliability and stability. In particular, underwater equipment with driving structure, such as hydraulic connector and gate valve driver, requires an anti-loosening device in the locked state to avoid accidental unlocking of the equipment and cause production accidents. During the unlocking process of the underwater equipment, the anti-loosening device should be unlocked first to avoid hindering the unlocking process, that is, the unlocking driving structure and the anti-loosening device should establish a logical relationship.

[0003] The commonly used driving structure in underwater oil and gas drilling equipment, such as gate valve driver, only relies on hydraulic driving piston and realizes pressure retention by solenoid valve. Once the solenoid valve fails, the valve is closed immediately. This kind of failure safety structure is beneficial to oil and gas production channel, but if it is applied to general occasions, its stability problem will be highlighted. The underwater connector driving structure also mostly adopts hydraulic drive, and its anti-loosening method generally adopts pressure locking or mechanical self-locking profile, but pressure locking will still leak under long-term pressure, and mechanical self-locking profile is easily affected by surface machining precision and assembly precision, etc., causing anti-loosening failure. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a step-by-step loadable underwater equipment driving structure with an anti-loosening device, which is used for underwater equipment that needs remote hydraulic drive and state retention, such as hydraulic connector and gate valve driver.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] A step-by-step loadable underwater equipment with an anti-loosening device, comprising:

[0007] A lock block and a locking body, the lock block and the locking body are adapted to switch between a locked state and an unlocked state;

[0008] A hydraulic cylinder is provided with a drive block and a limit rod. The drive block can activate the locking block to lock or unlock the locking body.

[0009] An anti-loosening device is provided with a clamping rod, which can contact the limiting rod of the driving hydraulic cylinder to clamp the limiting rod, or separate from the limiting rod;

[0010] The injection device provides hydraulic fluid to the drive cylinder and the anti-loosening device;

[0011] A locking fluid circuit, disposed between the injection device and the anti-loosening device, provides hydraulic fluid to the drive cylinder to drive the locking block to lock with the locking body; and

[0012] Unlocking fluid path, the unlocking fluid path including:

[0013] The main unlocking circuit is located between the injection device and the anti-loosening device, and provides hydraulic fluid to the anti-loosening device to push the clamping rod and the limiting rod apart;

[0014] A first unlocking branch is provided between the injection device and the drive cylinder, through which hydraulic fluid from the drive cylinder flows back to the injection device; and

[0015] The second unlocking branch is connected in parallel with the first unlocking branch. The second unlocking branch is located between the injection device and the driving cylinder. An adjustable pressure relief valve is provided on the second unlocking branch.

[0016] The driving cylinder is capable of bidirectional pressurization. The driving cylinder includes a piston, the limiting rod is disposed on the upper part of the piston, and the driving block is disposed on the lower part of the piston.

[0017] The piston divides the drive cylinder into a locking hydraulic chamber located at the top of the piston and an unlocking hydraulic chamber located at the bottom of the piston.

[0018] The anti-loosening device includes a spring that can push the clamping rod to contact the limiting rod.

[0019] A ratchet is provided at the end of the tensioning rod, and the ratchet can contact the limiting rod.

[0020] The ratchet is a one-way limiting structure, which only restricts the upward movement of the limiting rod, but does not restrict the downward movement of the limiting rod.

[0021] The adjustable pressure relief valve is a one-way check valve, which prevents the liquid in the unlocking hydraulic chamber from flowing back through the second unlocking branch.

[0022] Adjusting the adjustable pressure relief valve obstructs the hydraulic fluid flowing through the second unlocking branch, causing the hydraulic fluid to flow into the unlocking main circuit first.

[0023] The first unlocking branch is located between the injection device and the unlocking hydraulic chamber of the drive cylinder.

[0024] The second unlocking branch is located between the injection device and the unlocking hydraulic chamber of the drive cylinder.

[0025] The present invention has the following advantages due to the adoption of the above technical solutions:

[0026] The underwater equipment drive structure is hydraulically operated and simple in structure. It is equipped with a hydraulic unlocking and spring reset anti-loosening device, which can effectively ensure the position locking of the underwater oil and gas equipment drive structure. In addition, the unlocking fluid circuit of the drive cylinder and the anti-loosening device are loaded in stages, which further improves the reliability and operational stability of the drive structure. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0028] Figure 1 This is a layout diagram of the unlocked state of the driving structure of the present invention.

[0029] Figure 2 This is a layout diagram of the driving structure of the present invention in the locked state;

[0030] Figure 3 This is a detailed drawing of the drive cylinder assembly in the drive structure of the present invention;

[0031] Figure 4 This is a detailed drawing of the anti-loosening device component in the drive structure of the present invention.

[0032] The markings in the attached diagram are as follows:

[0033] 1-Locking body; 2-Locking block; 3-Drive block; 4-Drive cylinder; 5-Anti-loosening device; 6-Limit indicator rod; 7-Locking fluid circuit; 8-Anti-loosening structure unlocking fluid circuit; 9-Valve I; 10-Unlocking main fluid circuit; 11-Valve II; 12-Unlocking branch fluid circuit I; 13-Check valve; 14-Adjustable pressure relief valve; 15-Unlocking branch fluid circuit II; 16-Pressure injection device;

[0034] 4-1-Seal I; 4-2-Piston I; 4-3-Seal II; 4-4-Connecting rod; 4-5-Unlocking hydraulic chamber; 4-6-Seal III; 4-7-Locking hydraulic chamber;

[0035] 5-1- Anti-loosening and unlocking hydraulic chamber; 5-2- Seal IV; 5-3- Spring chamber; 5-4- Spring; 5-5- Piston II; 5-6- Clamping rod; 5-7- Racket; 5-8- Seal V;

[0036] 16-1-Liquid supply port I; 16-2-Liquid supply port II. Detailed Implementation

[0037] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0038] The structure of the present invention is as follows: an underwater equipment drive structure with anti-loosening device that can be loaded in steps, including a drive block 3, a drive cylinder 4, an anti-loosening device 5, a limit indicator rod 6, and a pressure injection device 16. The unit structures are provided with a locking liquid passage 7 and an unlocking main liquid passage 10. The liquid passage also includes valve I 9 and valve II 11. The unlocking main liquid passage 10 includes three unlocking branch liquid passages. Some branch liquid passages are also provided with a one-way valve 13 or a pressure regulating overflow valve 14. In addition, it also includes various cavities, seals, etc.

[0039] The driving cylinder 4 can apply pressure in both directions. The cylinder contains piston I 4-2, connecting rod 4-4, and seals I 4-1, III 4-6, and II 4-3, which seal the locking hydraulic chamber 4-7 and the unlocking hydraulic chamber 4-5. The bottom of the connecting rod 4-4 is fixedly connected to the driving block 3, allowing the driving block 3 to contact or disengage from the locking block 2, indirectly locking or unlocking the locking block 2 and the locking body 1. A limit indicator rod 6 is connected to the top of the driving cylinder 4, and anti-loosening devices 5 are fixed on both sides of the limit indicator rod 6. The anti-loosening device 5 mainly consists of a spring 5-4, piston II 5-5, and a pressing rod 5-6. The pressing rod 5-6 is equipped with ratchet teeth 5-7. Seals IV 5-2 and V 5-8 seal the anti-loosening and unlocking hydraulic chambers 5-1. Closed; the locking hydraulic chamber 4-7 on the drive cylinder 4 is connected to the supply port II 16-2 on the injection device 16 through the locking hydraulic passage 7, and the locking hydraulic passage 7 is equipped with valve I 9; the unlocking main hydraulic passage 10 is equipped with valve II 11, the upstream of the hydraulic passage is connected to the supply port I 16-1 on the injection device 16, and the downstream branch is three hydraulic passages: anti-loosening unlocking hydraulic passage 8, unlocking branch I 12, and unlocking branch II 15. Anti-loosening unlocking hydraulic passage 8 is connected to the anti-loosening unlocking hydraulic chamber 5-1 on the anti-loosening device 5, and unlocking branch I 12 and unlocking branch II 15 are connected in parallel. The downstream is connected to the unlocking hydraulic chamber 4-5 on the drive cylinder 4. The unlocking branch I 12 is equipped with a one-way valve 13, and the flow direction is from downstream to upstream. Figure 2 As indicated by the arrow in the one-way valve 13, an adjustable pressure relief valve 14 is installed on the unlocking branch II 15, and the flow direction is from upstream to downstream, as shown in the image. Figure 2 As indicated by the arrow in the adjustable pressure relief valve 14.

[0040] The problem solved by this invention is that the underwater equipment drive structure with anti-loosening device and step-by-step loading is mainly used for underwater equipment requiring remote hydraulic drive and state maintenance, such as hydraulic connectors and gate valve actuators. The drive structure is equipped with an anti-loosening device, which is a spring-loaded mechanical locking and hydraulic unlocking type. This effectively prevents the underwater equipment from accidentally unlocking and disengaging due to hydraulic failure or external force, thus preventing production safety accidents and meeting the high reliability and stability requirements of underwater oil and gas equipment. Furthermore, the drive cylinder and the unlocking hydraulic circuit of the anti-loosening device are logically related. An innovative step-by-step loading method is adopted, that is, the anti-loosening device is unlocked first, and then the drive cylinder is unlocked, avoiding damage to the anti-loosening device or affecting the normal unlocking of the drive cylinder. This invention solves the problems of poor state maintenance stability and high requirements for machining and assembly precision in existing underwater drive structures. At the same time, it also solves the problem that synchronous operation of the anti-loosening device and the drive cylinder can easily lead to unlocking failure or equipment damage.

[0041] Specifically, an underwater equipment drive structure with an anti-loosening device and capable of step-by-step loading includes a drive cylinder 4 whose bottom is connected to a drive block 3. The drive block 3 can contact or disengage from the locking block 2, indirectly achieving locking or unlocking of the locking block 2 and the locking body 1. A limit indicator rod 6 is connected to the top of the drive cylinder 4, and an anti-loosening device 5 is fixed on both sides of the limit indicator rod 6. The locking hydraulic chamber 4-7 on the drive cylinder 4 is connected to the liquid supply port II 16-2 on the injection device 16 through a locking hydraulic passage 7, and a valve I 9 is provided on the locking hydraulic passage 7. The unlocking main hydraulic passage... Valve II11 is installed on 10. The upstream of the liquid line is connected to the liquid supply port I16-1 on the pressure injection device 16. The downstream branch consists of three liquid lines: anti-loosening and unlocking liquid line 8, unlocking branch I12, and unlocking branch II15. Anti-loosening and unlocking liquid line 8 is connected to the anti-loosening and unlocking hydraulic chamber 5-1 on the anti-loosening device 5. Unlocking branch I12 and unlocking branch II15 are connected in parallel. The downstream is connected to the unlocking hydraulic chamber 4-5 on the drive cylinder 4. A one-way valve 13 is installed on unlocking branch I12, and an adjustable pressure relief valve 14 is installed on unlocking branch II15.

[0042] The driving cylinder 4 can apply pressure in both directions. The cylinder contains piston I 4-2, connecting rod 4-4, seal I 4-1, seal III 4-6 and seal II 4-3 to lock the hydraulic chamber 4-7 and unlock the hydraulic chamber 4-5 to form a seal.

[0043] The anti-loosening device 5 mainly consists of a spring 5-4, a piston II 5-5, and a clamping rod 5-6. The clamping rod 5-6 is equipped with a ratchet 5-7. The seals IV 5-2 and V 5-8 seal the anti-loosening unlocking hydraulic chamber 5-1.

[0044] The flow direction of the one-way valve 13 on the unlocked branch I12 is from downstream to upstream, such as... Figure 2 As indicated by the arrow in the one-way valve 13, the flow direction of the adjustable pressure relief valve 14 on the unlocking branch II 15 is from upstream to downstream, as shown in the image. Figure 2 As indicated by the arrow in the adjustable pressure relief valve 14.

[0045] Reference Figures 1-4 The underwater equipment drive structure with anti-loosening device of the present invention includes a drive block 3, a drive cylinder 4, an anti-loosening device 5, a limit indicator rod 6, and a pressure injection device 16. The unit structures are provided with a locking hydraulic passage 7 and an unlocking main hydraulic passage 10. The hydraulic passages also include valve I 9 and valve II 11. The unlocking main hydraulic passage 10 includes three unlocking branch hydraulic passages (anti-loosening unlocking hydraulic passage 8, unlocking branch I 12, and unlocking branch II 15). Unlocking branch I 12 is equipped with a one-way valve 13, and unlocking branch II 15 is equipped with a pressure regulating overflow valve 14. In addition, it includes various cavities (unlocking hydraulic cavity 4-5, locking hydraulic cavity 4-7, anti-loosening unlocking hydraulic cavity 5-1, spring cavity 5-3), seals (seal I 4-1, seal II 4-3, seal III 4-6, seal IV 5-2, seal V 5-8), etc.

[0046] The driving cylinder 4 can apply pressure in both directions. The cylinder contains piston I 4-2 and connecting rod 4-4, which can move simultaneously. Seals I 4-1, III 4-6, and II 4-3 respectively seal the locking hydraulic chamber 4-7 and the unlocking hydraulic chamber 4-5. The bottom of the connecting rod 4-4 is fixedly connected to the driving block 3. The driving block 3 generally has an inclined surface, which can contact or disengage from the corresponding inclined surface on the locking block 2, indirectly achieving the locking or unlocking of the locking block 2 and the locking body 1 (the locking surface of the locking block 2 and the locking body 1 includes, but is not limited to, H4, clamps, etc.). The top of the driving cylinder 4 is connected to a limit indicator rod 6. Anti-loosening devices 5 are fixed on both sides of the limit indicator rod 6, and their number can be two or more sets evenly distributed circumferentially. The anti-loosening devices 5 mainly consist of a spring 5-4, piston II 5-5, and a pressing rod 5-6. The pressing rod 5-6 is equipped with a ratchet 5-7. The piston II 5-5 and... The clamping rod 5-6 is fixedly connected, the spring 5-4 is set on the back side of the piston II 5-5, and the seals IV 5-2 and V 5-8 form a seal for the anti-loosening and unlocking hydraulic chamber 5-1; the locking hydraulic chamber 4-7 on the driving cylinder 4 is connected to the supply port II 16-2 on the injection device 16 through the locking hydraulic passage 7, and the locking hydraulic passage 7 is equipped with a valve I 9; the unlocking main hydraulic passage 10 is equipped with a valve II 11, the upstream of the hydraulic passage is connected to the supply port I 16-1 on the injection device 16, and the downstream branch is three hydraulic passages: the anti-loosening and unlocking hydraulic passage 8, the unlocking branch I 12, and the unlocking branch II 15. The anti-loosening and unlocking hydraulic passage 8 is connected to the anti-loosening and unlocking hydraulic chamber 5-1 on the anti-loosening device 5, the unlocking branch I 12 and the unlocking branch II 15 are connected in parallel, and the downstream is connected to the unlocking hydraulic chamber 4-5 on the driving cylinder 4. The unlocking branch I 12 is equipped with a one-way valve 13, and the flow direction is from downstream to upstream. Figure 2 As indicated by the arrow in the one-way valve 13, an adjustable pressure relief valve 14 is installed on the unlocking branch II 15, and the flow direction is from upstream to downstream, as shown in the image. Figure 2 As indicated by the arrow in the adjustable pressure relief valve 14.

[0047] The working principle of this invention is as follows: when it is necessary to lock the locking block 2 onto the locking body 1, the initial state of the underwater device drive structure of this invention is as follows: Figure 1 As shown. In this state, piston I 4-2 in the drive cylinder 4 and piston II 5-5 in the anti-loosening device 5 are both in the unlocked state, that is, hydraulic pressure is injected into the unlocking hydraulic chamber 4-5 in the drive cylinder 4 and the anti-loosening and unlocking hydraulic chamber 5-1 in the anti-loosening device 5, and piston I 4-2 in the drive cylinder 4 is in the unlocked state. Figure 1In the upper position shown, the spring 5-4 in the anti-loosening device 5 is compressed away from the center. When valve II11 is opened, the hydraulic pressure in the anti-loosening unlocking hydraulic chamber 5-1 and the unlocking hydraulic chamber 4-5, which are connected to the anti-loosening structure unlocking hydraulic passage 8 and the unlocking branch hydraulic passage I12 respectively, is released. The hydraulic pressure in the anti-loosening unlocking hydraulic chamber 5-1 flows back through the anti-loosening structure unlocking hydraulic passage 8, the unlocking main hydraulic passage 10, and through valve II11 to the supply port I16-1 on the injection device 16, and finally flows back to the hydraulic source. Under the elastic force of the spring 5-4, the piston II5-5 moves towards the center along with the clamping rod 5-6, and finally contacts the outer diameter of the limit indicator rod 6 (e.g., ...). Figure 2 As shown), but because ratchet 5-7 is a unidirectional limiting structure (as shown in the figure), Figure 4 (As shown), therefore, it only restricts the upward movement of the limit indicator rod 6, and will not limit or block the downward movement of the limit indicator rod 6. Open valve I9, and inject hydraulic pressure from the hydraulic source into the liquid supply port II16-2 on the injection device 16. The hydraulic pressure flows through valve I9 ​​and into the locking hydraulic chamber 4-7 through the locking hydraulic passage 7, pushing piston I4-2 to... Figure 1 The lower position shown is moved. At this time, the hydraulic pressure in the unlocking hydraulic chamber 4-5 flows through the unlocking branch hydraulic passage I12, the unlocking main hydraulic passage 10, and through the one-way valve 13 and valve II11 back to the supply port I16-1 on the injection device 16, and finally flows back to the hydraulic source. Because the adjustable pressure relief valve 14 on the unlocking branch hydraulic passage II15 has a one-way check valve function, the liquid in the unlocking hydraulic chamber 4-5 cannot flow back through this route. As the hydraulic pressure in the locking hydraulic chamber 4-7 is continuously injected, the piston I4-2 drives the connecting rod 4-4 to move downward and pushes the drive block 3 to contact the locking block 2, bringing the locking block 2 towards the center of the locking body 1, and finally achieving the locking of the locking block 2 and the locking body 1 (as shown). Figure 2 (As shown). Close valves I9 and II11 to maintain the pressure.

[0048] The locking state of the underwater device drive structure of the invention is as follows: Figure 2 As shown. In this state, piston I4-2 in the drive cylinder 4 and piston II5-5 in the anti-loosening device 5 are both in a locked state, that is, hydraulic pressure is injected into the locking hydraulic chamber 4-7 in the drive cylinder 4, and piston I4-2 is in a locked state. Figure 2 In the lower position shown, the hydraulic pressure in the anti-loosening unlocking hydraulic chamber 5-1 of the anti-loosening device 5 has been released, the spring 5-4 is in an extended state, and pushes the piston II 5-5 towards the center side. At this time, the ratchet 5-7 on the clamping rod 5-6 contacts the limit indicator rod 6 and restricts the upward movement of the limit indicator rod 6, so that the anti-loosening function of the drive structure of the present invention is realized.

[0049] When it is necessary to unlock the locking block 2 from the locking body 1, valve I9 ​​is ​​opened. At this time, the hydraulic pressure in the locking hydraulic chamber 4-7, which is connected to the locking hydraulic passage 7, is in a venting state. The hydraulic pressure in the locking hydraulic chamber 4-7 flows through the locking hydraulic passage 7 and back through valve I9 ​​to the supply port II16-2 on the injection device 16, and finally flows back to the hydraulic source. Valve II11 is opened, and hydraulic pressure is injected from the hydraulic source into the supply port I16-1 on the injection device 16. The hydraulic pressure flows through valve II11 and through the unlocking main hydraulic passage 10 into the three hydraulic branches: the unlocking hydraulic passage 8 of the anti-loosening structure, the unlocking branch hydraulic passage I12, and the unlocking branch hydraulic passage II15. However, since the unlocking branch hydraulic passage I12 is equipped with a one-way valve 13, and the flow trend is opposite to the flow direction of the one-way valve 13, the unlocking branch hydraulic passage I12 cannot pass through. An adjustable pressure relief valve 14 is provided on the unlocking branch hydraulic circuit II 15. The adjustable pressure relief valve 14 creates a certain obstruction to the hydraulic pressure flowing through the unlocking branch hydraulic circuit II 15. Therefore, the hydraulic pressure flowing through the unlocking main hydraulic circuit 10 first flows into the anti-loosening structure unlocking hydraulic circuit 8 and is injected into the anti-loosening unlocking hydraulic chamber 5-1. As the pressure increases, the piston II 5-5 is pushed away from the center, and the clamping rod 5-6 moves along with it. The spring 5-4 is compressed, and the ratchet 5-7 separates from the limit indicator rod 6. At this time, the anti-loosening function of the drive structure fails, and the limit indicator rod 6 can move freely up and down, as shown in the state. Figure 1 As shown. After the anti-loosening device is unlocked, the hydraulic pressure flowing through the main unlocking hydraulic passage 10 continues to be injected into the unlocking hydraulic passage 8 and the unlocking branch hydraulic passage II 15 of the anti-loosening structure. When the pressure in the unlocking branch hydraulic passage II 15 exceeds the set pressure value of the adjustable pressure relief valve 14, the adjustable pressure relief valve 14 opens in one direction, and the unlocking branch hydraulic passage II 15 is connected to the unlocking hydraulic chamber 4-5 on the drive cylinder 4. Hydraulic pressure is injected into the unlocking hydraulic chamber 4-5 and pushes the piston I 4-2 to move upward. The piston I 4-2 drives the connecting rod 4-4 and the drive block 3 to move upward synchronously. The drive block 3 disengages from the locking block 2, and the locking block 2 shifts away from the center of the locking body 1, finally realizing the unlocking of the locking block 2 from the locking body 1, as shown. Figure 1 As shown. During the pressurization process of the unlocking hydraulic chamber 4-5, the upstream pressure of the adjustable pressure relief valve 14 is always greater than the downstream pressure, so the one-way valve 13 on the unlocking branch hydraulic circuit I12 will not automatically open during this process. In addition, the adjustable pressure relief valve 14 can autonomously adjust the pressure value within a certain range according to the actual working conditions, which can effectively ensure that the piston I4-2 is pushed to move and unlock the drive cylinder 4 after the anti-loosening device 5 is fully unlocked. This realizes the step-by-step loading and action of the drive structure during the unlocking process, avoiding the following situations: the drive cylinder 4 fails to unlock due to the anti-loosening device 5 not being unlocked; or the piston I4-2 moves upward before the anti-loosening device 5 is unlocked, causing damage to the limit indicator rod 6 and the anti-loosening device 5.

[0050] The technical advantages of this invention are as follows: The underwater equipment drive structure of this invention solves the problems of poor stability in maintaining the state of existing underwater drive structures and high requirements for processing and assembly precision. Simultaneously, it solves the problem that the synchronous operation of the anti-loosening device and the drive cylinder can easily lead to unlocking failure or equipment damage. This underwater equipment drive structure is hydraulically operated and has a simple structure. It is equipped with an anti-loosening device with hydraulic unlocking and spring reset, which can effectively ensure the position locking of the underwater oil and gas equipment drive structure. In addition, the unlocking fluid circuits of the drive cylinder and the anti-loosening device are loaded and operated in stages, effectively improving the reliability and operational stability of the drive structure, and meeting the usage requirements of offshore oil and gas drilling and production equipment.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underwater device with an anti-loosening device that can be loaded in stages, characterized in that, include: A locking block and a locking body, the locking block and the locking body being adapted to switch between a locked state and an unlocked state; A hydraulic cylinder is provided with a drive block and a limit rod. The drive block can activate the locking block to lock or unlock the locking body. An anti-loosening device is provided with a clamping rod, which can contact the limiting rod of the driving hydraulic cylinder to clamp the limiting rod, or separate from the limiting rod; The injection device provides hydraulic fluid to the drive cylinder and the anti-loosening device; A locking fluid circuit is provided between the injection device and the anti-loosening device to supply hydraulic fluid to the drive cylinder to drive the locking block to lock with the locking body; and Unlocking fluid path, the unlocking fluid path including: The main unlocking circuit is located between the injection device and the anti-loosening device, and provides hydraulic fluid to the anti-loosening device to push the clamping rod and the limiting rod apart; A first unlocking branch is provided between the injection device and the drive cylinder, through which hydraulic fluid from the drive cylinder flows back to the injection device; and The second unlocking branch is connected in parallel with the first unlocking branch. The second unlocking branch is located between the injection device and the driving cylinder. An adjustable pressure relief valve is provided on the second unlocking branch. The anti-loosening device includes a spring, which is capable of pushing the clamping rod to contact the limiting rod; A ratchet is provided at the end of the tensioning rod, and the ratchet can contact the limiting rod; The ratchet is a one-way limiting structure, which only restricts the upward movement of the limiting rod, but does not restrict the downward movement of the limiting rod; The loading process is carried out in stages: first, the anti-loosening device is unlocked, and then the drive cylinder is unlocked.

2. The underwater device with anti-loosening device capable of step-by-step loading according to claim 1, characterized in that: The driving cylinder is capable of bidirectional pressurization. The driving cylinder includes a piston, the limiting rod is disposed on the upper part of the piston, and the driving block is disposed on the lower part of the piston.

3. The underwater device with anti-loosening device capable of step-by-step loading according to claim 2, characterized in that: The piston divides the drive cylinder into a locking hydraulic chamber located at the top of the piston and an unlocking hydraulic chamber located at the bottom of the piston.

4. The underwater device with anti-loosening device capable of step-by-step loading according to claim 3, characterized in that: The adjustable pressure relief valve is a one-way check valve, which prevents the liquid in the unlocking hydraulic chamber from flowing back through the second unlocking branch.

5. The underwater device with anti-loosening device capable of step-by-step loading according to claim 4, characterized in that: Adjusting the adjustable pressure relief valve obstructs the hydraulic fluid flowing through the second unlocking branch, causing the hydraulic fluid to flow into the unlocking main circuit first.

6. The underwater device with anti-loosening device capable of step-by-step loading according to claim 3, characterized in that: The first unlocking branch is located between the injection device and the unlocking hydraulic chamber of the drive cylinder.

7. The underwater device with anti-loosening device capable of step-by-step loading according to claim 3, characterized in that: The second unlocking branch is located between the injection device and the unlocking hydraulic chamber of the drive cylinder.

Images