Deep-sea columnar rock core moving and positioning device

Abstract

The invention discloses a deep-sea columnar rock core moving and positioning device, and relates to the technical field of deep-sea rock core on-site processing, the deep-sea columnar rock core moving and positioning device comprises a pressure balance driving unit and a pressure maintaining cylinder group fixedly connected to the pressure balance driving unit, and the pressure maintaining cylinder group is internally provided with a lead screw and a moving rod piece arranged outside the lead screw in a sleeving manner; one end of the lead screw is connected with the pressure balance driving unit and driven by the pressure balance driving unit to rotate, the lead screw is in threaded connection with a lead screw nut, one end of the movable rod piece is fixedly connected with the lead screw nut, the other end of the movable rod piece is connected with a gripper, the gripper is used for gripping a rock core, and an anti-rotation piece is fixedly arranged in the pressure maintaining cylinder set and arranged outside the movable rod piece in a sleeving mode. And the lead screw rotates to drive the movable rod piece and the gripper to axially move in and out of the pressure maintaining cylinder set. The rock core containing combustible ice can be quickly transferred and stored in an in-situ environment, and a high-quality rock core sample is provided for further test analysis in a laboratory, so that more accurate rock core test data is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of deep-sea core on-site processing, and in particular to a deep-sea columnar core mobile positioning device. Background Art

[0002] In view of the huge resource potential of methane hydrate, countries around the world attach great importance to the research and development of related technologies. Mastering the evolution characteristics of the basic physical properties of methane hydrate reservoirs is of great significance to improving the comprehensive strength of methane hydrate resource exploration and trial production. However, the simulation experiments and tests of the basic physical properties of methane hydrate reservoirs are still mainly based on artificially prepared methane hydrate core samples, resulting in a certain gap between the test results and the understanding of simulation experiments and the needs of methane hydrate exploration and trial production projects. More accurate quasi-in-situ physical property test data are needed for comparison and correction. In view of this, we proposed a deep-sea columnar core mobile positioning device to quickly transfer and store cores containing methane hydrate in an in-situ environment (high pressure and low temperature), providing high-quality core samples for further laboratory testing and analysis. Summary of the invention

[0003] The purpose of the present invention is to provide a deep-sea columnar core moving and positioning device to solve the problems existing in the above-mentioned prior art. The core containing combustible ice can be quickly transferred and stored in an in-situ environment (high pressure and low temperature), providing high-quality core samples for further testing and analysis in the laboratory, thereby obtaining more accurate core test data.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a deep-sea columnar core moving and positioning device, comprising a pressure-balancing drive unit and a pressure-maintaining cylinder group fixedly connected to the pressure-balancing drive unit, a lead screw and a movable rod sleeved outside the lead screw are arranged inside the pressure-maintaining cylinder group, one end of the lead screw is connected to the pressure-balancing drive unit and is driven to rotate by the pressure-balancing drive unit, a lead screw nut is threadedly connected to the lead screw, one end of the movable rod is fixedly connected to the lead screw nut, and the other end is connected to a gripper, the gripper is used to grab the core, an anti-rotation part is fixedly arranged inside the pressure-maintaining cylinder group, the anti-rotation part is sleeved outside the movable rod and is used to limit the circumferential rotation of the movable rod, and the rotation of the lead screw can drive the movable rod and the gripper to axially move in and out of the pressure-maintaining cylinder group.

[0005] In one embodiment, the pressure balance drive unit includes a motor, a gear transmission assembly, and a cover, a left balance chamber, a balance chamber bearing plate, a right balance chamber, a long-stroke balance chamber, and a connecting chamber arranged in sequence; the gear transmission assembly includes a balance main shaft, a balance secondary shaft, a first gear, a second gear, and a third gear; The blind cover is sealed and connected to the left balancing chamber, and is connected to the long-stroke balancing chamber through a long bolt. One end of the right balancing chamber is connected to the left balancing chamber through a slot, and the other end is sealed and connected to one end of the long-stroke balancing chamber. The other end of the long-stroke balancing chamber is sealed and connected to one end of the connecting chamber. The other end of the connecting chamber is sealed and connected to the pressure-maintaining cylinder group. There are two balancing chamber bearing plates, which are respectively installed on the left balancing chamber and the right balancing chamber, and the two balancing chamber bearing plates are kept parallel. The two ends of the balancing main shaft are respectively installed on the two balancing chamber bearing plates through bearings. One end of the balancing main shaft extends into the interior of the left balancing chamber and is sealed and connected to the interior of the left balancing chamber, and the other end extends into the interior of the right balancing chamber and is sealed and connected to the interior of the right balancing chamber. The third gear is mounted on the balancing main shaft through a flat key, and the third gear is located between the two balancing cavity bearing plates. Both ends of the balancing secondary shaft are mounted on the two balancing cavity bearing plates through bearings respectively. The second gear is mounted on the balancing secondary shaft through a flat key and remains meshed with the third gear. The motor is fixedly mounted on the balancing cavity bearing plate, and the first gear is mounted on the output shaft of the motor through a flat key and remains meshed with the second gear.

[0006] In one embodiment, the two balancing chamber bearing plates are connected by a reinforcing plate, and the reinforcing plate is connected to the balancing chamber bearing plate by bolts; the lead screw passes through the long-stroke balancing chamber and the connecting chamber, and is connected to the balancing spindle through a coupling.

[0007] In one embodiment, one end of the balancing main shaft located inside the balancing right cavity is sleeved with a first sealing copper sleeve, and is sealed and connected to the balancing right cavity through the first sealing copper sleeve, a first copper sleeve gland is installed on the first sealing copper sleeve by bolts, the first copper sleeve gland is sleeved on the balancing main shaft, and a first step is provided inside the balancing right cavity for axially limiting the first copper sleeve gland; One end of the balancing main shaft located inside the balancing left cavity is sleeved with a second sealing copper sleeve, and is sealed with the balancing left cavity through the second sealing copper sleeve. A second copper sleeve gland is installed on the second sealing copper sleeve by bolts. The second copper sleeve gland is sleeved on the balancing main shaft. A second step is provided inside the balancing left cavity for axially limiting the second copper sleeve gland.

[0008] In one embodiment, the interior of the pressure balancing drive unit is communicated with the interior of the pressure maintaining cylinder assembly.

[0009] In one embodiment, a water inlet is formed on the sealing cover, and the water inlet is connected to the interior of the pressure-maintaining cylinder assembly through a pipeline.

[0010] In one embodiment, the pressure maintaining cylinder group includes at least one pressure maintaining cylinder. When the pressure maintaining cylinder group is provided with at least two pressure maintaining cylinders, the pressure maintaining cylinders are connected in sequence.

[0011] In one embodiment, the pressure maintaining cylinder group is provided with two pressure maintaining cylinders, namely a first pressure maintaining cylinder and a second pressure maintaining cylinder, one end of the first pressure maintaining cylinder is fixedly connected to the pressure balance driving unit, and the other end is threadedly connected to a first end cap, one end of the second pressure maintaining cylinder is threadedly connected to a second end cap, the second end cap is connected to the first end cap by a clamp, and the other end of the second pressure maintaining cylinder is threadedly connected to a third end cap.

[0012] In one embodiment, the movable rod is a hexagonal aluminum rod, and the anti-rotation component is a hexagonal copper sleeve matched with the hexagonal aluminum rod; the gripper is connected to the movable rod through a transition block.

[0013] In one embodiment, a guide nut is connected to one end of the lead screw away from the pressure balancing drive unit, and the guide nut is used to guide and support the moving rod.

[0014] Compared with the prior art, the present invention has achieved the following technical effects: The deep-sea columnar core moving and positioning device provided by the present invention drives the screw to rotate through the pressure balance drive unit, and the rotation of the screw can drive the moving rod and the gripper to axially enter and exit the pressure-maintaining cylinder group, so that after the core is grasped by the gripper, the core can be retrieved and stored in the pressure-maintaining cylinder group. The pressure-maintaining cylinder group is filled with low-temperature seawater and is a high-pressure environment, which provides a stable high-pressure and low-temperature environment for the columnar core to ensure that the core is in an environment close to the pressure and temperature of the seabed, avoiding the decomposition of the combustible ice therein due to heating or pressure reduction, thereby ensuring the quality of the core sample, providing high-quality core samples for further testing and analysis in the laboratory, ensuring the authenticity and reliability of the test data, and obtaining more accurate core test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic structural diagram of a deep-sea columnar core mobile positioning device in an embodiment of the present invention; Figure 2 is a cross-sectional view of a deep-sea columnar core moving and positioning device in an embodiment of the present invention; Figure 3It is a partial enlarged view of the connection between the pressure balancing drive unit and the pressure maintaining cylinder assembly in an embodiment of the present invention.

[0017] In the figure: 1-pressure balancing drive unit, 2-pressure maintaining cylinder group, 201-first pressure maintaining cylinder, 202-second pressure maintaining cylinder, 3-first end cover, 4-hoop, 5-second end cover, 6-anti-rotation part, 7-third end cover, 8-stifling cover, 9-balance left chamber, 10-balance chamber bearing plate, 11-balance right chamber, 12-long stroke balance chamber, 13-connecting chamber, 14-screw, 15-moving rod, 16-guide nut, 17-transition block, 18-gripper, 19-screw nut, 20-coupling, 21-first copper sleeve gland, 22-first sealing copper sleeve, 23-reinforcement plate, 24-motor, 25-first gear, 26-second gear, 27-balance secondary shaft, 28-third gear, 29-balance main shaft, 30-second sealing copper sleeve, 31-second copper sleeve gland, 32-long bolt. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The purpose of the present invention is to provide a deep-sea columnar core moving and positioning device to solve the problems existing in the prior art. The core containing combustible ice can be quickly transferred and stored in an in-situ environment (high pressure and low temperature), providing high-quality core samples for further laboratory testing and analysis, thereby obtaining more accurate core test data.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 3As shown, the present embodiment provides a deep-sea columnar core moving and positioning device, comprising a pressure balancing drive unit 1 and a pressure maintaining tube group 2 fixedly connected to the pressure balancing drive unit 1, a lead screw 14 and a moving rod 15 sleeved on the outside of the lead screw 14 are arranged in the pressure maintaining tube group 2, one end of the lead screw 14 is connected to the pressure balancing drive unit 1, and is driven to rotate by the pressure balancing drive unit 1, a lead screw nut 19 is threadedly connected to the lead screw 14, one end of the moving rod 15 is fixedly connected to the lead screw nut 19, and the other end is connected to a gripper 18, the gripper 18 is used to grab the core, an anti-rotation part 6 is fixedly arranged in the pressure maintaining tube group 2, the anti-rotation part 6 is sleeved on the outside of the moving rod 15, and is used to limit the circumferential rotation of the moving rod 15, the rotation of the lead screw 14 can drive the moving rod 15 and the gripper 18 to axially move in and out of the pressure maintaining tube group 2, so that the moving rod 15 and the gripper 18 can extend outward from the pressure maintaining tube group 2 or be retracted inward into the pressure maintaining tube group 2.

[0022] In this embodiment, the pressure balance drive unit 1 includes a motor 24, a gear transmission assembly, and a cover 8, a left balance chamber 9, a balance chamber bearing plate 10, a right balance chamber 11, a long-stroke balance chamber 12, and a connecting chamber 13 arranged in sequence; the gear transmission assembly includes a balance main shaft 29, a balance secondary shaft 27, a first gear 25, a second gear 26, and a third gear 28; The cover 8 is sealed and connected to the left balancing chamber 9, and is connected to the long-stroke balancing chamber 12 through a long bolt 32. One end of the right balancing chamber 11 is connected to the left balancing chamber 9 through a slot, and the other end is sealed and connected to one end of the long-stroke balancing chamber 12. The other end of the long-stroke balancing chamber 12 is sealed and connected to one end of the connecting chamber 13. The other end of the connecting chamber 13 is sealed and connected to the pressure-maintaining cylinder group 2. There are two balancing chamber bearing plates 10, which are respectively installed on the left balancing chamber 9 and the right balancing chamber 11, and the two balancing chamber bearing plates 10 are kept parallel. The two ends of the balancing main shaft 29 are respectively installed on the two balancing chamber bearing plates 10 through bearings. One end of the balancing main shaft 29 extends into the interior of the left balancing chamber 9 and is sealed and connected to the interior of the left balancing chamber 9, and the other end extends into the interior of the right balancing chamber 11 and is sealed and connected to the interior of the right balancing chamber 11. The third gear 28 is installed on the balancing main shaft 29 through a flat key. The third gear 28 is located between the two balancing chamber bearing plates 10. Both ends of the balancing secondary shaft 27 are installed on the two balancing chamber bearing plates 10 through bearings respectively. The second gear 26 is installed on the balancing secondary shaft 27 through a flat key and keeps meshing with the third gear 28. The motor 24 is fixedly installed on the balancing chamber bearing plate 10. The first gear 25 is installed on the output shaft of the motor 24 through a flat key and keeps meshing with the second gear 26.

[0023] The motor 24 drives the lead screw 14 to rotate under the transmission action of the gear transmission assembly, and the rotation of the lead screw 14 drives the moving rod 15 and the gripper 18 to axially move in and out of the pressure-maintaining cylinder group 2 to achieve the movement and positioning of the core.

[0024] In this embodiment, the two balancing chamber bearing plates 10 are connected by a reinforcing plate 23, and the reinforcing plate 23 is connected to the balancing chamber bearing plate 10 by bolts to enhance the stability of the balancing chamber bearing plate 10; the screw 14 passes through the long-stroke balancing chamber 12 and the connecting chamber 13, and is connected to the balancing main shaft 29 through the coupling 20.

[0025] In this embodiment, one end of the balancing main shaft 29 located inside the balancing right cavity 11 is sleeved with a first sealing copper sleeve 22, and is sealed and connected to the balancing right cavity 11 through the first sealing copper sleeve 22. The inner side of the first sealing copper sleeve 22 and the outer side of the balancing main shaft 29 are sealed. A first copper sleeve gland 21 is installed on the first sealing copper sleeve 22 by bolts. The first copper sleeve gland 21 is sleeved on the balancing main shaft 29. A first step is provided inside the balancing right cavity 11 for axially limiting the first copper sleeve gland 21. One end of the balancing main shaft 29 located inside the balancing left cavity 9 is sleeved with a second sealing copper sleeve 30, and is sealedly connected to the balancing left cavity 9 through the second sealing copper sleeve 30. The inner side surface of the second sealing copper sleeve 30 and the outer side surface of the balancing main shaft 29 are sealed. A second copper sleeve gland 31 is installed on the second sealing copper sleeve 30 by bolts. The second copper sleeve gland 31 is sleeved on the balancing main shaft 29. A second step is provided inside the balancing left cavity 9 for axially limiting the second copper sleeve gland 31.

[0026] The interior of the pressure balancing drive unit 1 is connected to the interior of the pressure-maintaining cylinder group 2. Specifically, in this embodiment, a water inlet is provided on the cover 8, and the water inlet is connected to the interior of the pressure-maintaining cylinder group 2 through a pipeline to ensure that the pressure inside the pressure balancing drive unit 1 is balanced with the pressure inside the pressure-maintaining cylinder group 2, so as to ensure that the forces at both ends of the lead screw 14 are balanced.

[0027] Among them, the pressure-maintaining cylinder group 2 includes at least one pressure-maintaining cylinder. When the pressure-maintaining cylinder group 2 is provided with at least two, each pressure-maintaining cylinder is connected in sequence. Specifically, in the present embodiment, the pressure-maintaining cylinder group 2 is provided with two pressure-maintaining cylinders, namely, a first pressure-maintaining cylinder 201 and a second pressure-maintaining cylinder 202. One end of the first pressure-maintaining cylinder 201 is fixedly connected to the pressure balance drive unit 1, and the other end is threadedly connected with a first end cover 3. One end of the second pressure-maintaining cylinder 202 is threadedly connected with a second end cover 5. The second end cover 5 is connected to the first end cover 3 through a clamp 4, and the other end of the second pressure-maintaining cylinder 202 is threadedly connected with a third end cover 7. The first pressure-maintaining cylinder 201 and the second pressure-maintaining cylinder 202 provide a stable high-pressure and low-temperature environment for the columnar core, and at the same time provide a temporary storage space for the columnar core. The clamp 4 can be used to realize the rapid installation and removal of the two pressure-maintaining cylinders. The third end cap 7 is used to connect with other devices (such as a core cutting device and a core detection device) so as to cooperate with the online detection system to complete the test and analysis of the core during the transfer process, obtain the test data of the core in the first time, or cooperate with the core cutting device to complete the precise segmented cutting of the core, so as to provide high-quality core samples for further testing and analysis in the laboratory.

[0028] In this embodiment, the movable rod 15 is a hexagonal aluminum rod, and the anti-rotation component 6 is a hexagonal copper sleeve that matches the hexagonal aluminum rod. The hexagonal copper sleeve is arranged in the first end cover 3 for easy disassembly and assembly; the gripper 18 is connected to the movable rod 15 through a transition block 17.

[0029] In this embodiment, one end of the lead screw 14 away from the pressure balancing drive unit 1 is connected to a guide nut 16 , and the guide nut 16 is used to guide and support the moving rod 15 .

[0030] The working process of this device is: Before starting work, the lead screw nut 19 is located at the starting position, that is, the lead screw 14 is close to one end of the pressure balance drive unit 1. When starting work, the motor 24 rotates and drives the balance main shaft 29 to rotate through the first gear 25, the second gear 26 and the third gear 28, and then drives the lead screw 14 to rotate through the coupling 20. As the lead screw 14 rotates, the lead screw nut 19 moves to the right and drives the hexagonal aluminum rod (moving rod 15) and the gripper 18 to move to the right to grab the core. After grabbing the core, the core can be controlled to move left or right by changing the forward and reverse rotation of the motor 24, and the moving speed of the core can be controlled by adjusting the speed of the motor 24 to cooperate with the detection system to complete the online detection of the core. During the core movement process, the distance moved by the core and the position of the core can be converted by monitoring the number of revolutions of the motor 24. This function is particularly important when the core is cut in sections with the core cutting device. The positioning function of the device can be used to cut the core segment of any length required by the laboratory test device. During the entire working process, the first pressure-maintaining cylinder 201 and the second pressure-maintaining cylinder 202 are filled with low-temperature seawater and are in a high-pressure environment to ensure that the core is in an environment close to the pressure and temperature of the seabed, avoiding the decomposition of the combustible ice therein due to temperature increase or pressure reduction, thereby ensuring the quality of the core sample and the authenticity and reliability of the test data.

[0031] This device can quickly transfer and store cores containing combustible ice in an in-situ environment (high pressure and low temperature), and can cooperate with the online detection system to complete the test and analysis of the cores during the transfer process, and obtain the test data of the cores in the first time; it can also cooperate with the core cutting device to complete the precise segmented cutting of the cores, providing high-quality core samples for further testing and analysis in the laboratory.

[0032] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A deep-sea columnar core mobile positioning device, characterized in that: The cam is provided with a screw and a movable rod sleeved outside the screw, one end of the screw is connected to the pressure balancing drive unit and is driven to rotate by the pressure balancing drive unit, a screw nut is threadedly connected to the screw, one end of the movable rod is fixedly connected to the screw nut, and the other end is connected to a gripper, and the gripper is used to grip the core, an anti-rotation part is fixedly provided in the pressure maintaining cylinder group, the anti-rotation part is sleeved outside the movable rod and is used to limit the circumferential rotation of the movable rod, and the rotation of the screw can drive the movable rod and the gripper to axially move in and out of the pressure maintaining cylinder group.

2. The deep-sea columnar core mobile positioning device according to claim 1, characterized in that: The pressure balance drive unit includes a motor, a gear transmission assembly, and a cover, a left balance chamber, a balance chamber bearing plate, a right balance chamber, a long-stroke balance chamber, and a connecting chamber arranged in sequence; the gear transmission assembly includes a balance main shaft, a balance countershaft, a first gear, a second gear, and a third gear; The blind cover is sealed and connected to the left balancing chamber, and is connected to the long-stroke balancing chamber through a long bolt. One end of the right balancing chamber is connected to the left balancing chamber through a slot, and the other end is sealed and connected to one end of the long-stroke balancing chamber. The other end of the long-stroke balancing chamber is sealed and connected to one end of the connecting chamber. The other end of the connecting chamber is sealed and connected to the pressure-maintaining cylinder group. There are two balancing chamber bearing plates, which are respectively installed on the left balancing chamber and the right balancing chamber, and the two balancing chamber bearing plates are kept parallel. The two ends of the balancing main shaft are respectively installed on the two balancing chamber bearing plates through bearings. One end of the balancing main shaft extends into the interior of the left balancing chamber and is sealed and connected to the interior of the left balancing chamber, and the other end extends into the interior of the right balancing chamber and is sealed and connected to the interior of the right balancing chamber. The third gear is mounted on the balancing main shaft through a flat key, and the third gear is located between the two balancing cavity bearing plates. Both ends of the balancing secondary shaft are mounted on the two balancing cavity bearing plates through bearings respectively. The second gear is mounted on the balancing secondary shaft through a flat key and remains meshed with the third gear. The motor is fixedly mounted on the balancing cavity bearing plate, and the first gear is mounted on the output shaft of the motor through a flat key and remains meshed with the second gear.

3. The deep-sea columnar core mobile positioning device according to claim 2, characterized in that: The two balancing chamber bearing plates are connected via a reinforcing plate, and the reinforcing plate is connected to the balancing chamber bearing plates via bolts; the lead screw passes through the long-stroke balancing chamber and the connecting chamber, and is connected to the balancing spindle via a coupling.

4. The deep-sea columnar core mobile positioning device according to claim 2, characterized in that: One end of the balancing main shaft located inside the balancing right cavity is sleeved with a first sealing copper sleeve, and is sealed and connected to the balancing right cavity through the first sealing copper sleeve. A first copper sleeve gland is installed on the first sealing copper sleeve by bolts. The first copper sleeve gland is sleeved on the balancing main shaft. A first step is provided inside the balancing right cavity for axially limiting the first copper sleeve gland; One end of the balancing main shaft located inside the balancing left cavity is sleeved with a second sealing copper sleeve, and is sealed with the balancing left cavity through the second sealing copper sleeve. A second copper sleeve gland is installed on the second sealing copper sleeve by bolts. The second copper sleeve gland is sleeved on the balancing main shaft. A second step is provided inside the balancing left cavity for axially limiting the second copper sleeve gland.

5. The deep-sea columnar core mobile positioning device according to claim 1, characterized in that: The interior of the pressure balance driving unit is communicated with the interior of the pressure maintaining cylinder group.

6. The deep-sea columnar core mobile positioning device according to claim 2, characterized in that: The sealing cover is provided with a water inlet, and the water inlet is communicated with the interior of the pressure-maintaining cylinder group through a pipeline.

7. The deep-sea columnar core mobile positioning device according to claim 1, characterized in that: The pressure-maintaining cylinder group includes at least one pressure-maintaining cylinder. When the pressure-maintaining cylinder group is provided with at least two pressure-maintaining cylinders, the pressure-maintaining cylinders are connected in sequence.

8. The deep-sea columnar core moving and positioning device according to claim 7, characterized in that: The pressure-maintaining cylinder group is provided with two pressure-maintaining cylinders, namely a first pressure-maintaining cylinder and a second pressure-maintaining cylinder. One end of the first pressure-maintaining cylinder is fixedly connected to the pressure balance driving unit, and the other end is threadedly connected to a first end cap. One end of the second pressure-maintaining cylinder is threadedly connected to a second end cap, the second end cap is connected to the first end cap by a clamp, and the other end of the second pressure-maintaining cylinder is threadedly connected to a third end cap.

9. The deep-sea columnar core mobile positioning device according to claim 1, characterized in that: The movable rod is a hexagonal aluminum rod, and the anti-rotation component is a hexagonal copper sleeve matched with the hexagonal aluminum rod; the gripper is connected to the movable rod through a transition block.

10. The deep-sea columnar core mobile positioning device according to claim 1, characterized in that: One end of the lead screw away from the pressure balance drive unit is connected with a guide nut, and the guide nut is used to guide and support the moving rod.

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