Single-oil-cylinder double-control orifice clamping device and seabed drilling machine system

Abstract

The invention discloses a single-oil-cylinder double-control orifice clamping device and a seabed drilling machine system, and relates to the technical field of deep sea drilling, and the single-oil-cylinder double-control orifice clamping device comprises an orifice clamping assembly; the orifice clamping assembly comprises an outer frame and a clamping assembly, the clamping driving assembly comprises an eccentric shaft rotationally connected to the outer side of the outer frame, the eccentric shaft is located between the receding opening and the baffle, the eccentric shaft is driven by a second oil cylinder to rotate, and an eccentric body of the eccentric shaft can push the baffle and a clamping slip bowl close to the receding opening at the same time in the rotating process; and the two clamping slip seats can move close to each other synchronously along the guide rods. The seabed drilling machine system comprises a stand column and a power head connected to the stand column. And the orifice clamping assembly is used for clamping the drill rod and ensuring that the center of the drill rod is concentric with the main shaft of the power head, so that the power head and the drill rod can be reliably connected and disconnected. The forced centering guide device has the forced centering guide function, forced centering of an upper drill rod and a lower drill rod which are not coaxial can be achieved, and the reliability of drill rod connection and disassembly is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of deep - sea drilling, and more specifically, to an orifice clamping device with a single - cylinder dual - control and a subsea drilling rig system. Background Art

[0002] A subsea drilling rig is a drilling device whose drilling system operates entirely underwater; it can achieve remote energy supply and communication control with a load - bearing umbilical cable on a carrier vessel. All mechanisms of the subsea drilling rig need to be remotely controlled; it is difficult to achieve manual intervention during the action execution process like a land - based drilling rig. The orifice clamping device is a key component of the subsea drilling rig system; its main functions are to fix the drill pipe at the orifice and assist in the connection and disconnection of the drill pipe. Currently, the existing orifice clamping devices for subsea drilling rigs mainly have the following problems:

[0003] (1) During the clamping process, the position of the clamping jaw seat cannot be monitored in real - time. During remote control, the operator cannot grasp the clamping position and state in real - time, which is prone to misoperation and accidents.

[0004] (2) There are many actuators and poor synchronization performance. Most of the existing orifice clamping devices use hydraulic cylinders for driving, generally arranged symmetrically on both sides, and each hydraulic cylinder drives the clamping jaw seat on one side. Since the back pressure, structural parameters, and load of each hydraulic cylinder control circuit cannot be exactly the same, the extension speeds of the hydraulic cylinders are inconsistent, and the final clamping positions are also inconsistent, affecting the remote - control connection and disconnection accuracy of the drill pipe and making it easy for the drill pipe to fail to be connected or disconnected.

[0005] (3) The existing orifice clamping devices do not have a centering and guiding function. The existing orifice clamping devices generally only design the clamping function. When the upper and lower drill pipes are not coaxial, manual intervention is possible. Designing a centering and guiding function can ensure that when the upper and lower drill pipes are in a non - coaxial state, they can be forced to be centered through the hydraulic cylinder, effectively improving the reliability of drill pipe connection and disconnection.

[0006] To solve the above - mentioned technical problems, it is necessary to develop an orifice clamping device with a centering and guiding function, good synchronization, few actuators, and full - process digitization to achieve reliable and efficient connection and disconnection of the drill pipe. At the same time, it is convenient for the operator to grasp the clamping state in real - time during remote control and improve the safety of operation. Summary of the Invention

[0007] In view of this, the present invention provides an orifice clamping device with a single - cylinder dual - control and a subsea drilling rig system, aiming to solve the above - mentioned technical problems.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] An orifice clamping device with a single - cylinder dual - control, comprising: an orifice clamping assembly; the orifice clamping assembly includes:

[0010] An outer frame, on one side wall of which there is an avoidance opening;

[0011] A clamping assembly, the clamping assembly includes a plurality of guide rods fixed between the two side walls of the outer frame, a return spring is sleeved on the guide rods, two clamping chuck seats are slidably connected to the guide rods, and two ends of the return spring respectively abut against the two clamping chuck seats, and the two clamping chuck seats respectively abut against the two inner side walls of the outer frame, and the inner side surface of the clamping chuck seat has a clamping block; a pull rod is fixed to the clamping chuck seat away from the avoidance opening, the pull rod extends towards the clamping chuck seat close to the avoidance opening, and passes through the side wall of the outer frame with the avoidance opening, and the end of the pull rod is fixedly connected with a baffle corresponding to the avoidance opening;

[0012] A clamping driving assembly, the clamping driving assembly includes an eccentric shaft rotatably connected to the outside of the outer frame, the eccentric shaft is located between the avoidance opening and the baffle, the eccentric shaft is driven to rotate by a second oil cylinder, and the eccentric body of the eccentric shaft can simultaneously push the baffle and the clamping chuck seat close to the avoidance opening during rotation, so that the two clamping chuck seats can move synchronously closer along the guide rods.

[0013] Through the above technical solution, the present invention realizes the mechanical synchronization of the clamping action by setting the cooperation of the eccentric shaft and the clamping assembly, and uses a single oil cylinder to drive the eccentric shaft to rotate, thereby pushing the two clamping chuck seats to move synchronously closer along the guide rods, avoiding the problem of inconsistent clamping positions caused by the back pressure of multiple oil cylinder control circuits, structural parameters, and inconsistent loads in the prior art, and improving the clamping accuracy. Adopting the single oil cylinder dual control method, compared with the prior art solution of symmetrically arranging multiple oil cylinders on both sides, the number of actuators is effectively reduced, the cost is reduced, and at the same time, the failure rate caused by the large number of components is also reduced, which is convenient for on-site maintenance.

[0014] Preferably, in the above-mentioned orifice clamping device with single oil cylinder dual control, it further includes a centering and guiding assembly. The number of the centering and guiding assemblies is two, and they are symmetrically arranged on both sides of the outer frame respectively and are located above the clamping assembly; the centering and guiding assembly includes a first oil cylinder fixed on the outer side wall of the outer frame, the telescopic cylinder of the first oil cylinder is fixedly connected with a centering chuck, and a guiding block is fixed on the inner side surface of the centering chuck.

[0015] Preferably, in the above-mentioned orifice clamping device with single oil cylinder dual control, limit rods are fixed on both sides of the centering chuck, the limit rods pass through the side wall of the outer frame in the reverse direction, and a locking nut is threadedly connected to the end of the limit rod, and the locking nut is used to adjust the adjusting gasket sleeved on the end of the limit rod.

[0016] Preferably, in the above-mentioned orifice clamping device with a single oil cylinder and dual control, a second displacement sensor is installed at the tail of the first oil cylinder. One end of the second displacement sensor is connected to the end cover of the first oil cylinder, and the other end is placed inside the first oil cylinder.

[0017] Preferably, in the above-mentioned orifice clamping device with a single oil cylinder and dual control, a first displacement sensor is fixed on the outer side wall of the outer frame, and a magnetic ring corresponding to the measuring rod of the first displacement sensor is fixed on the clamping chuck seat. By the movement of the magnetic ring, the position of the clamping chuck seat can be monitored in real time.

[0018] Preferably, in the above-mentioned orifice clamping device with a single oil cylinder and dual control, the clamping drive assembly further includes a single ear seat two fixed on the outer side wall of the outer frame. The single ear seat two is used for rotatably connecting the eccentric shaft. The middle part of the eccentric shaft is connected to the telescopic rod of the second oil cylinder through a double ear seat and a pin shaft. A single ear seat one for fixing is rotatably connected to the cylinder block of the second oil cylinder.

[0019] Preferably, in the above-mentioned orifice clamping device with a single oil cylinder and dual control, a third displacement sensor is installed at the tail of the second oil cylinder. One end of the third displacement sensor is connected to the end cover of the second oil cylinder, and the other end is placed inside the second oil cylinder.

[0020] Preferably, in the above-mentioned orifice clamping device with a single oil cylinder and dual control, a copper sleeve is sleeved at the connection part between the end of the eccentric shaft and the single ear seat two.

[0021] The present invention also provides a subsea drilling rig system, including: a column and a power head connected to the column; and an orifice clamping device with a single oil cylinder and dual control. The outer frame is fixed to the column and is located below the power head. The orifice clamping assembly is used for clamping the drill pipe and ensuring that the center of the drill pipe is concentric with the main shaft of the power head, facilitating the reliable connection and disconnection between the power head and the drill pipe.

[0022] Through the above technical solutions, the present invention has a forced centering and guiding function, which can ensure that the center of the drill pipe is concentric with the main shaft of the power head. Thus, when the upper and lower drill pipes are not coaxial, the oil cylinder is used for forced centering, effectively improving the reliability of the connection and disconnection of the drill pipe and avoiding the problems of difficult or failed connection and disconnection caused by the non-coaxiality of the drill pipe. The clamping accuracy of the orifice clamping device is high, there are few actuators, and the whole process is digitalized, making the connection and disconnection process of the drill pipe more reliable and efficient. The operator can accurately perform remote control operations by real-time monitoring information such as the clamping position, reducing the difficulty and risk of manual intervention and improving the work efficiency.

[0023] Preferably, in the above-mentioned subsea drilling rig system, the cylinder block of the second oil cylinder is connected to the column through a single ear seat one.

[0024] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a hole mouth clamping device and a subsea drilling rig system with single cylinder dual control, having the following beneficial effects:

[0025] 1. The present invention can realize real-time monitoring of the clamping position. During remote operation, it is convenient for the operator to grasp the clamping state in real time, improving the safety of operation.

[0026] 2. The present invention can achieve mechanical synchronization to ensure the clamping accuracy.

[0027] 3. The present invention effectively reduces the number of actuators, reduces the cost, and reduces the failure rate. At the same time, it is easy to maintain on-site.

[0028] 4. The present invention has a forced centering and guiding function, which can achieve forced centering of the upper and lower drill pipes with different axes, improving the reliability of drill pipe connection and disconnection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0030] Figure 1 The drawings are schematic structural diagrams of the hole mouth clamping device with single cylinder dual control provided by the present invention;

[0031] Figure 2 The drawings are schematic structural diagrams of the outer frame provided by the present invention;

[0032] Figure 3 The drawings are schematic structural diagrams of the centering and guiding assembly provided by the present invention;

[0033] Figure 4 The drawings are schematic structural diagrams of the clamping drive assembly provided by the present invention;

[0034] Figure 5 The drawings are top views of the clamping assembly provided by the present invention;

[0035] Figure 6 The drawings are internal schematic diagrams of the clamping jaw seat provided by the present invention;

[0036] Figure 7 The drawings are schematic structural diagrams of the subsea drilling rig system provided by the present invention;

[0037] Figure 8 The drawings are provided by the present invention Figure 7 partial enlarged view.

[0038] Wherein:

[0039] 1 - Outer frame; 2 - Centering guide component; 3 - Clamping drive component; 4 - Clamping component; 5 - First displacement sensor;

[0040] 1.1 - Avoidance opening;

[0041] 2.1 - First oil cylinder; 2.2 - Second displacement sensor; 2.3 - Centering collet; 2.4 - Limit rod; 2.5 - Adjusting shim; 2.6 - Locking nut; 2.7 - Guide block;

[0042] 3.1 - Single ear seat one; 3.2 - Second oil cylinder; 3.3 - Third displacement sensor; 3.4 - Double ear seat; 3.5 - Pin shaft; 3.6 - Single ear seat two; 3.7 - Eccentric shaft; 3.8 - Bronze bushing;

[0043] 4.1 - Clamping collet seat; 4.2 - Return spring; 4.3 - Guide rod; 4.4 - Pull rod; 4.5 - Baffle; 4.6 - Clamping block; 4.7 - Magnetic ring;

[0044] 100 - Drill pipe; 101 - Column; 102 - Hole mouth clamping assembly; 103 - Power head. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] Refer to Attachment Figure 1 to Attachment Figure 6 , the embodiments of the present invention disclose a hole mouth clamping device with single - oil - cylinder dual - control, including: hole mouth clamping assembly 102; the hole mouth clamping assembly 102 includes:

[0047] Outer frame 1, and an avoidance opening 1.1 is provided on one side wall of the outer frame 1;

[0048] The clamping assembly 4, the clamping assembly 4 includes a plurality of guide rods 4.3 fixed between the two side walls of the outer frame 1. A return spring 4.2 is sleeved on the guide rod 4.3. Two clamping chuck seats 4.1 are slidably connected to the guide rod 4.3. The two ends of the return spring 4.2 respectively abut against the two clamping chuck seats 4.1, and the two clamping chuck seats 4.1 respectively abut against the two inner side walls of the outer frame 1. The inner side surface of the clamping chuck seat 4.1 has a clamping block 4.6; a pull rod 4.4 is fixed to the clamping chuck seat 4.1 far from the avoidance port 1.1. The pull rod 4.4 extends towards the clamping chuck seat 4.1 close to the avoidance port 1.1 and passes through the side wall of the outer frame 1 having the avoidance port 1.1. The end of the pull rod 4.4 is fixedly connected with a baffle 4.5 corresponding to the avoidance port 1.1;

[0049] The clamping drive assembly 3, the clamping drive assembly 3 includes an eccentric shaft 3.7 rotatably connected to the outside of the outer frame 1. The eccentric shaft 3.7 is located between the avoidance port 1.1 and the baffle 4.5. The eccentric shaft 3.7 is driven to rotate by a second oil cylinder 3.2, and the eccentric body of the eccentric shaft 3.7 can simultaneously push the baffle 4.5 and the clamping chuck seat 4.1 close to the avoidance port 1.1 during rotation, so that the two clamping chuck seats 4.1 can move synchronously closer along the guide rod 4.3.

[0050] In this embodiment, the clamping block 4.6 is fixed on the clamping chuck seat 4.1. By setting different clamping blocks 4.6, different drill pipe specifications can be adapted.

[0051] In this embodiment, when the piston rod of the second oil cylinder 3.2 in the clamping drive assembly 3 retracts, it drives the eccentric shaft 3.7 to rotate clockwise. During the rotation of the eccentric shaft 3.7, it will squeeze the baffle 4.5 and the clamping chuck seat 4.1 of the clamping assembly 4, and then synchronously drive the symmetrically arranged clamping chuck seats 4.1 to move in the opposite direction to achieve clamping. When the piston rod of the second oil cylinder 3.2 in the clamping drive assembly 3 extends, the clamping chuck seat 4.1 is reset under the action of the return spring 4.2.

[0052] The clamping drive assembly 3 utilizes the lever principle to achieve the synchronous movement of multiple groups of clamping assemblies controlled by a single oil cylinder.

[0053] See the appendix Figure 3 It also includes a centering and guiding assembly 2. The number of the centering and guiding assemblies 2 is two, and they are symmetrically arranged on both sides of the outer frame 1 and are located above the clamping assembly 4; the centering and guiding assembly 2 includes a first oil cylinder 2.1 fixed on the outer side wall of the outer frame 1. The telescopic cylinder of the first oil cylinder 2.1 is fixedly connected with a centering chuck 2.3. The inner side surface of the centering chuck 2.3 is fixed with a guiding block 2.7.

[0054] To further optimize the above technical solution, limiting rods 2.4 are fixed on both sides of the middle slip 2.3. The limiting rods 2.4 pass through the side wall of the outer frame 1 in the reverse direction, and locking nuts 2.6 are threadedly connected to the ends of the limiting rods 2.4. The locking nuts 2.6 are used to adjust the adjusting washers 2.5 sleeved on the ends of the limiting rods 2.4. By adjusting the locking nuts 2.6, the position of the adjusting washers 2.5 can be adjusted, thereby realizing the mechanical limit of the guiding slip seat 2.3. By setting different guiding blocks 2.7, guiding for drill pipes with different outer diameters can be realized.

[0055] To further optimize the above technical solution, a second displacement sensor 2.2 is installed at the tail of the first oil cylinder 2.1. One end of the second displacement sensor 2.2 is connected to the end cover of the first oil cylinder 2.1, and the other end is placed inside the first oil cylinder 2.1, which is used to monitor the displacement of the oil cylinder piston rod in real time and realize the digitization of the middle guiding position.

[0056] To further optimize the above technical solution, a first displacement sensor 5 is fixed on the outer side wall of the outer frame 1, and a magnetic ring 4.7 corresponding to the measuring rod of the first displacement sensor 5 is fixed on the clamping slip seat 4.1. Through the movement of the magnetic ring 4.7, the position of the clamping slip seat 4.1 can be monitored in real time, realizing the digitization of the clamping process.

[0057] See Appendix Figure 4 , the clamping drive assembly 3 further includes a single-ear seat two 3.6 fixed on the outer side wall of the outer frame 1. The single-ear seat two 3.6 is used for rotatably connecting an eccentric shaft 3.7. The middle part of the eccentric shaft 3.7 is connected to the telescopic rod of the second oil cylinder 3.2 through a double-ear seat 3.4 and a pin shaft 3.5. The cylinder body of the second oil cylinder 3.2 is rotatably connected with a single-ear seat one 3.1 for fixation.

[0058] To further optimize the above technical solution, a third displacement sensor 3.3 is installed at the tail of the second oil cylinder 3.2. One end of the third displacement sensor 3.3 is connected to the end cover of the second oil cylinder 3.2, and the other end is placed inside the second oil cylinder 3.2. The second oil cylinder 3.2 can drive the eccentric shaft 3.7 to rotate. Through the third displacement sensor 3.3, the displacement of the piston rod of the second oil cylinder 3.2 can be monitored in real time, and then the angle of the eccentric shaft 3.7 can be calculated.

[0059] To further optimize the above technical solution, a copper sleeve 3.8 is sleeved at the connection between the end of the eccentric shaft 3.7 and the single-ear seat two 3.6.

[0060] See Appendix Figure 7 and Appendix Figure 8, the orifice clamping assembly 102 provided in this embodiment is used for a subsea drilling rig system, and includes: a column 101 and a power head 103 connected to the column 101; an outer frame 1 is fixed to the column 101 and is located below the power head 103. The orifice clamping assembly 102 is used to clamp the drill pipe 100 and ensure that the center of the drill pipe 100 is concentric with the main shaft of the power head 103, facilitating the reliable connection and disconnection between the power head 103 and the drill pipe 100.

[0061] To further optimize the above technical solution, the cylinder block of the second oil cylinder 3.2 is connected to the column 101 through a single-ear seat 3.1.

[0062] To further optimize the above technical solution, the material of all structural parts is 316L, and there is auxiliary video monitoring such as a camera during the working process.

[0063] The working process of the present invention is as follows:

[0064] The orifice clamping assembly 102 is installed on the column 101, and its main function is to clamp the drill pipe 100 and ensure that the center of the drill pipe 100 is concentric with the main shaft of the power head 103, facilitating the reliable connection and disconnection between the power head 103 and the drill pipe.

[0065] Centering and guiding process: The first oil cylinders 2.1 on both sides drive the centering jaws 2.3 to move in opposite directions. By adjusting the shim 2.5 on the limit rod 2.4, the telescopic position of the piston rod of the first oil cylinder 2.1 can be mechanically limited. Finally, through mechanical limitation, the circle formed by the final positions of the centering jaws 2.3 is coaxial with the main shaft of the power head 103. When the upper and lower drill pipes are not coaxial, centering and guiding can ensure the forced centering of the upper and lower drill pipes, meet the coaxiality requirements for the internal and external threads of the upper and lower drill pipes, and achieve rapid and reliable connection of the internal and external threads of the upper and lower drill pipes.

[0066] Synchronous clamping process: When the piston rod of the second oil cylinder 3.2 in the clamping drive assembly 3 retracts, it drives the eccentric shaft 3.7 to rotate clockwise. During the rotation of the eccentric shaft 3.7, it will squeeze the baffle 4.5 and the clamping jaw seat 4.1 of the clamping assembly 4, and then synchronously drive the symmetrically arranged clamping jaw seats 4.1 to move in opposite directions to achieve clamping. When the piston rod of the second oil cylinder 3.2 in the clamping drive assembly 3 extends, the clamping jaw seat 4.1 is reset under the action of the return spring 4.2. The clamping drive assembly 3 adopts the lever principle, which can use a small-sized oil cylinder to achieve a large clamping force.

[0067] Position monitoring process: The first oil cylinder 2.1 in the centering and guiding assembly 2 and the second oil cylinder 3.2 in the clamping drive assembly 3 are both internally provided with displacement sensors, which can monitor and feedback the position information of the driven components in real time. The position of the clamping jaw seat 4.1 can be directly monitored in real time through the displacement sensor 5, realizing the digitization of the clamping process.

[0068] Compared with the existing solutions, the solution provided by the present invention can digitize the whole process of centering and clamping, improving the safety of the action execution process. At the same time, the device can effectively reduce the number of actuators and has the characteristics of simple structure, reliability and easy operation.

[0069] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is the difference from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description of the method part.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-cylinder dual-control orifice clamping device, comprising: The orifice clamping assembly (102) is characterized in that the orifice clamping assembly (102) comprises: An outer frame (1), wherein a side wall of the outer frame (1) is provided with an escape opening (1.1); A clamping assembly (4), the clamping assembly (4) comprising a plurality of guide rods (4.3) fixed between two side walls of the outer frame (1), the guide rods (4.3) being sleeved with a return spring (4.2), the guide rods (4.3) being slidably connected with two clamping slip seats (4.1), the two ends of the return spring (4.2) respectively pressing against the two clamping slip seats (4.1), and making the two clamping slip seats (4.1) respectively abut against the two inner side walls of the outer frame (1) The inner side surface of the clamping cava seat (4.1) is provided with a clamping block (4.6); a pull rod (4.4) is fixed to the clamping cava seat (4.1) away from the avoidance opening (1.1); the pull rod (4.4) extends toward the clamping cava seat (4.1) close to the avoidance opening (1.1) and passes through the side wall of the outer frame (1) having the avoidance opening (1.1); the end of the pull rod (4.4) is fixedly connected with a baffle (4.5) corresponding to the avoidance opening (1.1); A clamping drive assembly (3), the clamping drive assembly (3) comprising an eccentric shaft (3.7) rotatably connected to the outside of the outer frame (1), the eccentric shaft (3.7) being located between the avoidance opening (1.1) and the baffle (4.5), the eccentric shaft (3.7) being driven to rotate by a second oil cylinder (3.2), and the eccentric body of the eccentric shaft (3.7) being able to simultaneously push the baffle (4.5) and the clamping cava seat (4.1) close to the avoidance opening (1.1) during the rotation process, so that the two clamping cava seats (4.1) can perform a synchronous approaching action along the guide rod (4.3).

2. A single-cylinder dual-control orifice clamping device according to claim 1, characterized in that: It also includes a centering guide assembly (2), the number of which is two and which are symmetrically arranged on both sides of the outer frame (1) and located above the clamping assembly (4); the centering guide assembly (2) includes a first oil cylinder (2.1) fixed to the outer side wall of the outer frame (1), the telescopic cylinder of the first oil cylinder (2.1) is fixedly connected to a centering slip (2.3), and the inner side surface of the centering slip (2.3) is fixed with a guide block (2.7).

3. A single-cylinder dual-control orifice clamping device according to claim 2, characterized in that: Limit rods (2.4) are fixed on both sides of the centering slip (2.3), the limit rods (2.4) pass through the side walls of the outer frame (1) in the opposite direction, and the ends of the limit rods (2.4) are threadedly connected with locking nuts (2.6), and the locking nuts (2.6) are used to adjust the adjustment gaskets (2.5) sleeved on the ends of the limit rods (2.4).

4. A single-cylinder dual-control orifice clamping device according to claim 2, characterized in that: A second displacement sensor (2.2) is installed at the tail of the first oil cylinder (2.1); one end of the second displacement sensor (2.2) is connected to the tail cover of the first oil cylinder (2.1), and the other end is built into the first oil cylinder (2.1).

5. The single-cylinder dual-control orifice clamping device according to claim 1, characterized in that: A first displacement sensor (5) is fixed to the outer side wall of the outer frame (1), and a magnetic ring (4.7) corresponding to the measuring rod of the first displacement sensor (5) is fixed to the clamping slip seat (4.1), and the position of the clamping slip seat (4.1) can be monitored in real time through the movement of the magnetic ring (4.7).

6. The single-cylinder dual-control orifice clamping device according to claim 1, characterized in that: The clamping drive assembly (3) also includes a second single-ear seat (3.6) fixed on the outer side wall of the outer frame (1), the second single-ear seat (3.6) being used for rotationally connecting to the eccentric shaft (3.7), the middle part of the eccentric shaft (3.7) being connected to the telescopic rod of the second oil cylinder (3.2) via a double-ear seat (3.4) and a pin (3.5), and the cylinder body of the second oil cylinder (3.2) is rotationally connected to a single-ear seat (3.1) for fixing.

7. A single-cylinder dual-control orifice clamping device according to claim 6, characterized in that: A third displacement sensor (3.3) is installed at the tail of the second oil cylinder (3.2); one end of the third displacement sensor (3.3) is connected to the tail cover of the second oil cylinder (3.2), and the other end is built into the interior of the second oil cylinder (3.2).

8. The single-cylinder dual-control orifice clamping device according to claim 6, characterized in that: A copper sleeve (3.8) is sleeved at the connection between the end of the eccentric shaft (3.7) and the second single ear seat (3.6).

9. A subsea drilling rig system, comprising: A column (101) and a power head (103) connected to the column (101); characterized in that it also includes a single-cylinder dual-control orifice clamping device according to any one of claims 1 to 8, the outer frame (1) is fixed to the column (101) and is located below the power head (103), the orifice clamping assembly (102) is used to clamp the drill rod (100) and ensure that the center of the drill rod (100) is concentric with the main axis of the power head (103), so as to facilitate reliable connection and unloading of the power head (103) and the drill rod (100).

10. The subsea drilling rig system according to claim 9, characterized in that: The cylinder body of the second oil cylinder (3.2) is connected to the column (101) via a single ear seat (3.1).

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