Hydraulic locking device for a ram preventer

Abstract

This utility model discloses a hydraulic locking device for a gate blowout preventer, relating to the field of oil drilling and production technology. It includes a gate blowout preventer, a locking shaft and a cylinder liner mounted on the gate blowout preventer. Its key feature is that it also includes a main unit mounted on the gate blowout preventer. The main unit includes a hydraulic motor fixedly connected to the cylinder liner via a motor connecting sleeve. The rotor of the hydraulic motor has a hollow structure, and a drive sleeve is coaxially driven within the rotor. A drive rod is coaxially slidably fitted within the drive sleeve, with both ends of the drive rod passing through both ends of the drive sleeve. One end is fixedly connected to the locking shaft, and the other end is fixedly connected to a manual operating lever. The advantages of this utility model are: by adopting an external modular design, it eliminates the need to modify the original blowout preventer structure. Through the motor connecting sleeve and quick fixing to the cylinder head, and the direct connection of the drive rod to the original locking shaft, the manual locking blowout preventer can be quickly upgraded to a hydraulic locking mode, significantly reducing the difficulty, time, and cost of retrofitting existing equipment.

Description

Technical Field

[0001] This utility model belongs to the field of oil drilling and production technology, and relates to gate blowout preventers, specifically to a hydraulic locking device for a gate blowout preventer. Background Technology

[0002] A gate blowout preventer (BOP) is a well control device used during drilling and workover processes to seal the annular space or empty well formed by the tubing string and the wellhead, effectively preventing blowout accidents. Most mainstream gate BOPs on the market currently use a mechanical locking structure. After closing, operators must approach the BOP to manually lock it, and before opening, operators must manually unlock it. Furthermore, BOP assemblies typically consist of multiple units, and unlocking / locking BOPs at higher locations requires climbing to operate each one individually, which is inconvenient, labor-intensive, and time-consuming. In emergencies, operators must approach the wellhead to lock the gate BOP, posing a safety risk.

[0003] Although hydraulic locking gate blowout preventers already exist, upgrading and retrofitting the large number of existing gate blowout preventers in service at well sites is difficult, time-consuming, and costly, which restricts the improvement of drilling efficiency. Finding a simple and efficient retrofitting solution has become an urgent task. Utility Model Content

[0004] This invention addresses the technical challenges of upgrading existing gate blowout preventers (BOPs), which are characterized by high difficulty, time commitment, and cost, hindering drilling efficiency. It provides a hydraulic locking device for gate blowout preventers. Employing an external modular design, it eliminates the need to modify the original BOP structure. Through a motor connecting sleeve and cylinder head quick fixation, and with the drive rod directly connecting to the original locking shaft, manually locking BOPs can be rapidly upgraded to hydraulic locking, significantly reducing the difficulty, time, and cost of retrofitting existing equipment.

[0005] The technical solution adopted by this utility model is as follows: a hydraulic locking device for a gate blowout preventer is provided, including a gate blowout preventer and a locking shaft and a cylinder sleeve disposed on the gate blowout preventer. The feature is that it also includes a main unit disposed on the gate blowout preventer. The main unit includes a hydraulic motor fixedly connected to the cylinder sleeve through a motor connecting sleeve. The rotor of the hydraulic motor has a hollow structure, and a drive sleeve is coaxially driven and fitted inside the rotor. A drive rod is coaxially slidably fitted inside the drive sleeve. The two ends of the drive rod pass through the two ends of the drive sleeve, one end of which is fixedly connected to the locking shaft, and the other end is fixedly connected to a manual operating lever.

[0006] The hydraulic motor and cylinder liner are fixed by a motor connecting sleeve. Combined with the direct docking of the drive rod and the locking shaft, the hydraulic motor can drive the automatic locking and unlocking operation, while retaining the manual operating lever to ensure mechanical operation in emergency situations. The upgrade can be completed without changing the original blowout preventer body structure, which greatly reduces the threshold for retrofitting existing equipment.

[0007] To further optimize this technical solution, the rotor and the drive sleeve are coaxially driven together via splines, and the inner wall of the drive sleeve has a polygonal hollow structure. The drive rod is adapted to the shape of the inner wall of the drive sleeve and forms a sliding fit.

[0008] The spline fit between the rotor and the drive sleeve, and the polygonal fit structure between the drive sleeve and the drive rod, ensure efficient transmission of hydraulic motor torque to the locking shaft, while also allowing the drive rod to slide axially to accommodate the extension and retraction of the locking shaft, thus ensuring a balance between transmission stability and operational flexibility.

[0009] To further optimize this technical solution, one end of the drive rod that is fixedly connected to the locking shaft is provided with an inner square sleeve. The inner square sleeve is coaxially inserted with the locking shaft and is fixedly connected to the locking shaft by screws.

[0010] The drive rod is inserted into the locking shaft through the inner square sleeve and fixed with screws. The connection method is simple and reliable, and can accurately match the original locking shaft structure, avoiding cutting or reconstruction of the original parts, shortening the modification cycle and ensuring connection strength.

[0011] To further optimize this technical solution, one end of the manual operating lever is provided with a handwheel, and the other end is provided with an inner square sleeve. The inner square sleeve is coaxially inserted with the drive rod and fixedly connected to the drive rod by means of screws.

[0012] The manual operating lever adopts a combination structure of handwheel and inner square sleeve, which is quickly connected to the drive rod by screws. By adjusting the length of the manual operating lever, it can be used for both local operation and remote emergency manual control, improving the adaptability of the operation scenario.

[0013] To further optimize this technical solution, the host is also equipped with an electromagnetic induction gate locking position indicator device, which includes a proximity switch fixedly connected to the inner wall of the motor connecting sleeve, and a strong magnetic induction block that cooperates with the proximity switch. The strong magnetic induction block is fixedly connected to the drive sleeve.

[0014] By combining a strong magnetic induction block with a proximity switch, the number of rotations of the locking shaft is converted into an electrical signal in real time and displayed on a digital counter, thereby achieving quantitative monitoring of the locking status, avoiding errors in human judgment, and improving operational accuracy.

[0015] To further optimize this technical solution, the host is also equipped with a visual gate locking position indicator device, which includes a semi-enclosed protective cover set on the side end face of the hydraulic motor away from the gate blowout preventer. The protective cover is located above the drive rod, and both the outer wall of the protective cover and the outer wall of the drive rod are provided with indicator marks.

[0016] The fully locked and unlocked positions are clearly displayed by the markings on the protective cover and drive rod, enabling status visualization. Combined with the protective cover's function of preventing the drive rod from falling, this enhances the safety of the equipment.

[0017] Further optimization of this technical solution also includes a control system. The control system comprises a ground-based blowout preventer control system for the control gate blowout preventer and a locking device control system for the control host. The locking device control system is independently integrated into the control cabinet. The locking device control system includes an oil supply line and a return line installed on the control cabinet. The oil supply line and return line are connected to the ground-based blowout preventer control system via pipelines. The oil supply line is connected to the inlet and pressure gauge of the three-position four-way manual control valve on the control cabinet via pipelines, and the return line of the three-position four-way manual control valve... The three-position four-way manual control valve's function port A is connected to the pressure regulating valve, unloading valve, and ball valve assembly on the control cabinet via pipelines, and is also connected to the manifold on the gate blowout preventer via pipelines. The manifold is connected to the hydraulic motor's inlet via pipelines, forming a locking oil circuit. The three-position four-way manual control valve's function port B is connected to the unloading valve and ball valve assembly via pipelines, and is also connected to the gate blowout preventer via pipelines. The manifold is connected to the hydraulic motor's return oil port via pipelines, forming an unlocking oil circuit.

[0018] The independently integrated locking device control system is linked with the ground blowout preventer system through the oil supply and return lines. Combined with components such as pressure gauges, pressure regulating valves, and ball valves in the unlocking and locking lines, it achieves pressure regulation and independent control of a single main unit. With the help of manifolds and quick connectors, it supports the coordinated operation of multiple blowout preventer groups, realizing remote and modular control and reducing the intensity of manual intervention.

[0019] To further optimize this technical solution, the overflow port of the hydraulic motor is connected in parallel to the manifold of the gate blowout preventer via a pipeline, and is also connected to the return oil circuit via a pipeline.

[0020] The parallel design of the unloading valve and the hydraulic motor overflow oil circuit can release the trapped pressure in the control system pipeline of the locking device before maintenance or relocation of the equipment, ensuring personnel safety.

[0021] To further optimize this technical solution, the oil supply circuit and the oil return circuit are respectively connected to the opening port and the closing port of the backup function rotary valve in the ground blowout preventer control system.

[0022] The connection between the oil supply circuit, oil return circuit and the backup function valve of the ground blowout preventer control system does not require an additional power source. It can directly utilize the existing hydraulic power of the system, simplifying the structural modification and ensuring oil circuit compatibility.

[0023] To further optimize this technical solution, a mechanical limit switch is provided on the backup function rotary valve of the ground blowout preventer control system.

[0024] Mechanical limit switches enable the left-side (open) and middle-side (block) functions of the standby rotary valve, while disabling the right-side (close) function. This prevents hydraulic circuit disruptions caused by misoperation and ensures controllable hydraulic power transmission.

[0025] The beneficial effects of this utility model are as follows:

[0026] 1. Adopting an external modular design, it does not require modification of the original blowout preventer body structure. It can be quickly fixed to the cylinder head through the motor connecting sleeve and the drive rod can be directly connected to the original locking shaft. The manual locking blowout preventer can be quickly upgraded to hydraulic locking mode, which greatly reduces the difficulty, time and cost of retrofitting existing equipment.

[0027] 2. The hydraulic motor drive replaces the traditional manual rotary locking shaft, allowing operators to complete locking or unlocking operations from the ground control system far from the wellhead. This eliminates the need for manual operation of each unit from a height, significantly reducing labor intensity and shortening operation time, while effectively solving the problem of inconvenient operation of high-altitude equipment in blowout preventer units.

[0028] 3. The locking device control system is linked with the ground blowout preventer system through a backup function rotary valve. Only the necessary valve positions are activated and mechanical limits are set to achieve stable control without interfering with the original system. The ball valve group and manifold are designed to support the parallel connection of multiple devices and are compatible with different specifications of blowout preventer groups to meet the needs of modular transformation.

[0029] 4. The electromagnetic induction device displays the number of rotations of the locking shaft in real time via a digital counter, while the visual indicator shows the locking or unlocking position intuitively through markings. This dual protection avoids misjudgment and ensures accurate and reliable operation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the connection between the hydraulic locking device and the control system in this embodiment;

[0031] Figure 2 This is a schematic diagram of the connection between the hydraulic locking device and the gate blowout preventer in this embodiment;

[0032] Figure 3 This is a cross-sectional structural diagram of the hydraulic locking device in this embodiment;

[0033] Figure 4 This is a schematic diagram of the connection structure between the drive sleeve and the strong magnetic induction block in this embodiment;

[0034] Figure 5 This is a schematic diagram of the drive rod in this embodiment;

[0035] Figure 6 This is a schematic diagram of the protective cover in this embodiment;

[0036] Figure 7 This is a schematic diagram of the control cabinet in this embodiment.

[0037] In the diagram, 1. Gate blowout preventer; 101. Locking shaft; 102. Cylinder liner; 2. Main unit; 201. Hydraulic motor; 202. Drive sleeve; 2021. Strong magnetic induction block; 203. Drive rod; 204. Motor connecting sleeve; 2041. Proximity switch; 205. Protective cover; 2051. Indicator mark; 3. Manual operating lever; 301. Handwheel; 4. Inner square sleeve; 5. Ground blowout preventer control system; 501. Backup function rotary valve; 6. Locking device control system; 601. Oil supply line; 602. Oil return line; 603. Control cabinet; 6031. Pressure gauge; 6032. Three-position four-way manual control valve; 6033. Pressure regulating valve; 6034. Ball valve; 6035. Unloading valve; 6036. Digital display counter; 7. Manifold. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] Please see the appendix Figures 1-6 A hydraulic locking device for a gate blowout preventer includes a gate blowout preventer 1 and a main unit 2 mounted on the gate blowout preventer 1. Each gate cavity of the gate blowout preventer 1 requires the installation of two sets of hydraulic locking device main units 2. Each main unit 2 includes a hydraulic motor 201, which is mounted on a cylinder liner 102 of the gate blowout preventer 1 via a motor connecting sleeve 204. The rotor of the hydraulic motor 201 has a hollow structure, and a drive sleeve 202 is coaxially driven within the rotor. The rotor and drive sleeve 202 are coaxially driven through a spline. The inner wall of the drive sleeve 202 has a polygonal hollow structure, and a drive rod 203 is coaxially slidably fitted within the drive sleeve 202, thereby transmitting the torque of the hydraulic motor 201 to the drive rod. 203, the two ends of the drive rod 203 pass through the two ends of the drive sleeve 202 respectively, one end of which is fixedly connected to the locking shaft 101 of the gate blowout preventer 1. An inner square sleeve 4 is provided on the end face of the drive rod 203. The inner square sleeve 4 is coaxially inserted with the locking shaft 101 and fixedly connected to the locking shaft 101 by screws. After the hydraulic motor 201 runs, it drives the locking shaft 101 on the gate blowout preventer 1 to run through the drive rod 203, thereby enabling the gate blowout preventer 1 to lock or unlock. During the locking or unlocking process, the locking shaft 101 drives the drive rod 203 to move. The shape of the drive rod 203 is adapted to the inner wall of the drive sleeve 202 to form a sliding fit, thereby ensuring the smoothness of the drive.

[0040] Please see the appendix Figure 2The other end of the drive rod 203 is fixedly connected to a manual operating rod 3. The end of the manual operating rod 3 connected to the drive rod 203 is also provided with an inner square sleeve 4. The inner square sleeve 4 is coaxially inserted with the drive rod 203 and is also fixedly connected to the drive rod 203 by screws. The other end of the manual operating rod 3 is fixedly connected to a handwheel 301, so that the drive rod 203 and the locking shaft 101 on the gate blowout preventer 1 can be manually operated to lock or unlock, ensuring operational flexibility.

[0041] Please see the appendix Figure 3 The main unit 2 is also equipped with an electromagnetic induction gate position locking indicator device, which includes a proximity switch 2041 fixedly connected to the inner wall of the motor connecting sleeve 204, and a strong magnetic induction block 2021 that is inductively engaged with the proximity switch 2041. The strong magnetic induction block 2021 is fixedly connected to the drive sleeve 202. When the drive sleeve 202 is driven by the hydraulic motor 201 to rotate one revolution, the strong magnetic induction block 2021 sends a counting pulse through the proximity switch 2041. The counting pulse is transmitted to the digital display counter 6036 of the control system of the locking device through the signal cable and displays the value. This value reflects the number of revolutions of the locking shaft 101, which makes it convenient for the operator to judge the locking status.

[0042] Please see the appendix Figure 2 Appendix Figure 6 The main unit 2 is also equipped with a visual gate position locking indicator device, which includes a semi-enclosed protective cover 205 set on the side end face of the hydraulic motor 201 away from the gate blowout preventer 1. The protective cover 205 is located above the drive rod 203. The protective cover 205 can be fixed to the hydraulic motor 201 by bolts. The length of the protective cover 205 covers the drive rod 203 in the locked state, thereby preventing heavy objects from falling and injuring the drive rod 203. The outer wall of the protective cover 205 and the outer wall of the drive rod 203 are both equipped with indicator marks 2051. The indicator marks 2051 can be indicated by spraying fluorescent paint or pasting reflective strips on the drive rod 203 and the protective cover 205, respectively, to indicate the fully locked and fully unlocked positions, so that personnel can visually see the locking status.

[0043] Please see the appendix Figure 1 Appendix Figure 7The hydraulic locking device also includes a control system, which comprises a ground blowout preventer control system 5 for controlling the gate blowout preventer 1 and a locking device control system 6 for controlling the main unit 2. The locking device control system 6 is independently integrated into the control cabinet 603. The oil supply line 601 of the locking device control system 6 is responsible for supplying hydraulic power fluid to the main unit 2 of the locking device. It is connected to the ground blowout preventer control system 5 externally through a high-pressure fire-resistant hose and internally to the oil inlet (P) of the three-position four-way manual control valve 6032 through a rigid pipeline. The oil return line 602 of the locking device control system 6 is responsible for returning the oil from the main unit 2 of the locking device. The hydraulic power fluid is returned to the ground blowout preventer control system 5. It is connected externally to the ground blowout preventer control system 5 via a high-pressure fire-resistant hose, and internally connected to the return port (T) of the three-position four-way manual control valve 6032 and pressure gauge 6031 via a rigid pipeline. The function port A of the three-position four-way manual control valve 6032 is connected sequentially via a rigid pipeline to a pressure regulating valve 6033, several ball valve groups (multiple ball valves 6034 connected in parallel), and an unloading valve 6035. Then, it is connected to the manifold 7 on the gate blowout preventer 1 via a hose with a quick-connect fitting. The manifold 7 then splits the hydraulic fluid into two branches, each supplying fluid to the gate blowout preventer 1. The oil inlet of the hydraulic motor 201 inside the main unit 2 of the hydraulic locking device at both ends, and the function port B of the three-position four-way manual control valve 6032 are connected in sequence to several ball valve groups (multiple ball valves 6034 in parallel) and unloading valve 6035 via rigid pipelines. Then, they are connected to the manifold 7 on the gate blowout preventer 1 via a hose with a quick connector. The manifold 7 then splits the oil into two branches, which are respectively delivered to the return ports of the hydraulic motors 201 inside the main unit 2 of the hydraulic locking device installed at both ends of the gate blowout preventer 1. The locking and unlocking states can be switched by operating the three-position four-way manual control valve 6032, and the parallel ball valves 6034 can be connected to the return ports of the hydraulic motors 201 inside the main unit 2 of the hydraulic locking device at both ends of the gate blowout preventer 1. The switch can select the gate blowout preventer 1 to be unlocked or locked. The combination of the two operations can realize the locking and unlocking control of the specified gate blowout preventer 1. In addition, the overflow port of the hydraulic motor 201 in the main unit 2 of all hydraulic locking devices is connected in parallel to the manifold 7 through a hydraulic hose with a quick connector. Then, the overflow oil is returned to the return oil circuit 602 of the locking device control system 6 through a common hose. The parallel design of the unloading valve 6035 and the overflow oil circuit of the hydraulic motor 201 can release the trapped pressure in the pipeline of the locking device control system 6 before maintenance or relocation of equipment, ensuring personnel safety.

[0044] Please see the appendix Figure 1 Appendix Figure 7The oil supply line 601 and oil return line 602, which are connected to the locking device control system 6, are respectively connected to the opening port and closing port of the backup function rotary valve 501 of the ground blowout preventer control system 5. In order to ensure the stability of the internal oil circuit of the locking device control system 6, the backup function rotary valve 501 of the ground blowout preventer control system 5 is equipped with a mechanical limit. Only the left position function (opening function) and the middle position function (blocking function) of the backup function rotary valve 501 are used. The right position function (closing function) is not available. By switching the backup function rotary valve 501, the locking device control system 6 can be put into standby or destandby state. In the standby state, hydraulic oil can be transmitted to the locking device control system 6, thereby realizing the locking and unlocking of the gate blowout preventer 1. In the destandby state, the hydraulic oil in the hydraulic control system of the ground blowout preventer cannot be transmitted to the locking device control system 6, and the hydraulic locking and unlocking functions are not available.

[0045] The working principle of the hydraulic locking device for the gate blowout preventer is as follows: The existing gate blowout preventer 1 is modified, and the main unit 2 is installed on the locking shaft 101 of the gate blowout preventer 1. The hydraulic motor 201 of the main unit 2 is fixedly connected to the cylinder liner 102 on the gate blowout preventer 1 through the motor connecting sleeve 204. The motor connecting sleeve 204 is a hollow connecting device. One end of it is connected to the hydraulic motor 201 by bolts, and the other end is connected to the cylinder head of the gate blowout preventer 1 by bolts. The rotor of the hydraulic motor 201 driving the locking shaft 101 is a hollow structure. Inside the rotor, a drive sleeve 202 is coaxially driven via a spline. The drive sleeve 202 has a polygonal hollow structure inside. A drive rod 203 with a polygonal cross-section matching the internal structure of the drive sleeve 202 passes through the center of the drive sleeve 202. This structure transmits the torque of the hydraulic motor 201 to the drive rod 203 while facilitating the back-and-forth sliding of the drive rod 203 within the drive sleeve 202, thus enabling the hydraulic motor 201 to drive the locking shaft 101 of the blowout preventer 1 to lock / unlock. One end of the drive rod 203 is an inner square sleeve 4 connecting to the locking shaft 101 of the blowout preventer 1, which is screwed to the original locking shaft 101 of the blowout preventer 1. The middle part of the drive rod 203 is a polygonal segment of sufficient length to meet the mechanical locking requirements of the blowout preventer, which mates with the hollow polygonal structure of the drive sleeve 202. The length of the polygonal section of the drive rod 203 needs to be determined based on the structure of the gate blowout preventer 1 and the main unit 2 of the hydraulic locking device. It is required that when the gate blowout preventer 1 is in the closed state and the locking shaft 101 is fully screwed into the gate shaft, the drive rod 203 exposed outside the hydraulic motor 201 still has sufficient length for installing the original manual operating lever of the gate blowout preventer 1. The other end of the drive rod 203 has a square structure similar to the shaft head of the original blowout preventer locking shaft 101, facilitating connection to the manual operating lever. One end of the manual operating lever is a handwheel 301, and the other end is connected to an inner square sleeve 4, which is connected to the drive rod 203 by screws. The connection between the handwheel 301 and the inner square sleeve 4 can be a hollow tube of a specified length, generally 5-10m, for convenient long-distance manual locking. Alternatively, it can be directly connected to allow for local manual locking and unlocking of the hydraulic locking device. To display the locking position of the gate blowout preventer 1, an electromagnetic induction gate locking position indicator is added to the main unit 2. Specifically, a strong magnetic induction block 2021 is added to the drive sleeve 202, and a proximity switch 2041 is added to the motor connection sleeve 204. When the hydraulic motor 201 drives the rotor to rotate one revolution, the drive sleeve 202 also rotates one revolution. When the strong magnetic induction block 2021 passes the proximity switch 2041, it emits a counting pulse. The counting pulse is transmitted to the digital display counter 6036 of the locking device control system 6 via a signal cable and displays the value. This value reflects the number of revolutions of the locking shaft 101, making it convenient for the operator to judge the locking status.A visual gate locking position indicator can also be added to the main unit 2. Specifically, a semi-enclosed protective cover 205 is added to the outside of the hydraulic motor 201. This protective cover 205 is installed on the upper part of the side of the hydraulic motor 201 facing away from the gate blowout preventer 1, and is connected to the main unit 2 of the hydraulic locking device by bolts. The length of the protective cover 205 should be sufficient to cover the motor drive rod 203 in the locked state to prevent heavy objects falling from above from damaging the motor drive rod 203. Indicator marks 2051 should be set on the protective cover 205 and the drive rod 203, such as by spraying fluorescent paint or attaching reflective strips, to indicate the fully locked and fully unlocked positions respectively, making it convenient for personnel to visually inspect the locking status. The control system for the gate blowout preventer 1 and the locking device is divided into a ground blowout preventer control system 5 and a locking device control system 6. The locking device control system 6 is independently integrated into the control cabinet 603 and is connected to the ground blowout preventer control system 5 through independent oil supply lines 601 and return lines 602. It provides hydraulic power to the main unit 2 of the hydraulic locking device at both ends of the gate blowout preventer 1. The system switches the oil circuit direction through a three-position four-way manual control valve 6032 and selects the target object in conjunction with a ball valve 6034 to realize the locking and unlocking of the designated gate blowout preventer 1. The locking control is implemented, and the overflow oil from the hydraulic motor 201 in the main unit 2 of all hydraulic locking devices is returned to the return oil circuit 602 of the locking device control system 6 via the manifold 7 and the common hose. To ensure the stability of the internal oil circuit of the locking device control system 6, the backup function rotary valve 501 of the ground blowout preventer control system 5 needs to be mechanically limited. Only the left position function (opening function) and the middle position function (blocking function) of the backup function rotary valve 501 are used, and the right position function (closing function) is not available. This is to avoid oil circuit disorder caused by misoperation and to ensure that the hydraulic power transmission is controllable.

Claims

1. A hydraulic locking device for a gate blowout preventer, comprising a gate blowout preventer (1) and a locking shaft (101) and a cylinder liner (102) disposed on the gate blowout preventer (1), characterized in that: It also includes a main unit (2) installed on the gate blowout preventer (1). The main unit (2) includes a hydraulic motor (201) fixedly connected to the cylinder liner (102) via a motor connecting sleeve (204). The rotor of the hydraulic motor (201) is hollow, and a drive sleeve (202) is coaxially driven inside the rotor. A drive rod (203) is coaxially slidably connected inside the drive sleeve (202). The two ends of the drive rod (203) pass through the two ends of the drive sleeve (202), one end of which is fixedly connected to the locking shaft (101), and the other end is fixedly connected to a manual operating lever (3).

2. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: The rotor and the drive sleeve (202) are coaxially driven together by a spline. The inner wall of the drive sleeve (202) is a polygonal hollow structure. The drive rod (203) is adapted to the shape of the inner wall of the drive sleeve (202) and forms a sliding fit.

3. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: The drive rod (203) is fixedly connected to the locking shaft (101) at one end, and an inner square sleeve (4) is provided. The inner square sleeve (4) is coaxially inserted with the locking shaft (101) and fixedly connected to the locking shaft (101) by screws.

4. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: One end of the manual operating lever (3) is provided with a handwheel (301), and the other end is provided with an inner square sleeve (4). The inner square sleeve (4) is coaxially inserted with the drive rod (203) and fixedly connected to the drive rod (203) by means of screws.

5. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: The host (2) is also provided with an electromagnetic induction gate locking position indicator device, which includes a proximity switch (2041) fixedly connected to the inner wall of the motor connecting sleeve (204), and a strong magnetic induction block (2021) that is inductively coordinated with the proximity switch (2041). The strong magnetic induction block (2021) is fixedly connected to the drive sleeve (202).

6. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: The host (2) is also provided with a visual gate locking position indicator device, which includes a semi-enclosed protective cover (205) on the side end face of the hydraulic motor (201) away from the gate blowout preventer (1). The protective cover (205) is located above the drive rod (203), and both the outer wall of the protective cover (205) and the outer wall of the drive rod (203) are provided with indicator marks (2051).

7. The hydraulic locking device for a gate blowout preventer according to claim 1, characterized in that: It also includes a control system, which includes a ground blowout preventer control system (5) for the control gate blowout preventer (1) and a locking device control system (6) for the control host (2). The locking device control system (6) is independently integrated on the control cabinet (603). The locking device control system (6) includes an oil supply line (601) and an oil return line (602) installed on the control cabinet (603). The oil supply line (601) and the oil return line (602) are connected to the ground blowout preventer control system (5) through pipelines. The oil supply line (601) is connected to the inlet of the three-position four-way manual control valve (6032) and the pressure gauge (6031) on the control cabinet (603) through pipelines. The return port of the three-position four-way manual control valve (6032) is connected to the return port through pipelines. The oil circuit (602) is connected. The function port A of the three-position four-way manual control valve (6032) is connected to the pressure regulating valve (6033), unloading valve (6035) and ball valve (6034) group on the control cabinet (603) in sequence through pipelines, and is connected to the manifold (7) on the gate blowout preventer (1) through pipelines. The manifold (7) is connected to the oil inlet of the hydraulic motor (201) through pipelines, forming a locking oil circuit. The function port B of the three-position four-way manual control valve (6032) is connected to the unloading valve (6035) and ball valve (6034) group in sequence through pipelines, and is connected to the manifold (7) on the gate blowout preventer (1) through pipelines. The manifold (7) is connected to the return oil port of the hydraulic motor (201) through pipelines, forming an unlocking oil circuit.

8. A hydraulic locking device for a gate blowout preventer according to claim 7, characterized in that: The overflow port of the hydraulic motor (201) is connected in parallel to the manifold (7) of the gate blowout preventer (1) via a pipeline, and is connected to the return oil circuit (602) via a pipeline.

9. A hydraulic locking device for a gate blowout preventer according to claim 7, characterized in that: The oil supply line (601) and oil return line (602) are respectively connected to the open port and the closed port of the standby function rotary valve (501) in the ground blowout preventer control system (5).

10. The hydraulic locking device for a gate blowout preventer (1) according to claim 9, characterized in that: The standby function rotary valve (501) of the ground blowout preventer control system (5) is equipped with a mechanical limit switch.

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