A three-axis gripper for a nuclear magnetic resonance system

Abstract

A three-axis gripper for a nuclear magnetic resonance system provided by the present invention belongs to the technical field of nuclear magnetic resonance detection, and includes: a gripping main body having a receiving cavity for placing a sample; two plugging components respectively arranged at both ends of the receiving cavity; the plugging component includes: an axial pressure push rod and an axial pressure end cover, and the axial pressure end cover has a confining pressure through hole communicating the outside with the receiving cavity; the axial pressure push rod can slidably penetrate through the axial pressure end cover along the axial direction and partially extend into the receiving cavity, and a displacement through hole communicating the outside with the receiving cavity is provided inside the axial pressure push rod. The present invention applies confining pressure to the sample through the confining pressure through hole, applies axial displacement pressure to the sample through the displacement through hole, and applies axial pressure to the end face of the sample through the axial sliding of the axial pressure push rod, simulating the full-space stress condition of the sample, making parameters such as porosity, permeability, and saturation measured by the sample more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear magnetic resonance detection, and particularly relates to a three-axis holder for a nuclear magnetic resonance system. Background Art

[0002] In oil and gas exploration and development as well as deep rock mass engineering, there are complex relationships of interaction and mutual restriction among the stress field, temperature field, seepage field and rock mass deformation field in the environment where the rock mass of the relevant formation is located. During the process of rock mass excavation and oil and gas production, in order to avoid disasters induced by stress concentration and unloading of the rock mass and to avoid affecting the production efficiency due to high temperature, high pressure and high seepage, it is necessary to take out rock samples from the relevant formation and simulate the environment where the rock is located to measure parameters such as porosity, permeability and saturation of the rock samples.

[0003] At present, a conventional holder is used to fixedly hold a rock sample. The main body of the conventional holder is a metal cylinder, and metal plugs are installed at both ends of the metal cylinder; the rock sample and the nuclear magnetic resonance radio frequency coil are both placed inside the metal cylinder. The first fluid flows in through the through hole in the middle of the metal plug to form a displacement pressure on the rock sample, and the second fluid flows in through the through hole on the outer wall of the metal cylinder to form a confining pressure on the rock sample. At the same time, the radio frequency coil emits radio frequency pulses for nuclear magnetic resonance detection.

[0004] The above-mentioned structure of the conventional holder can only apply displacement pressure and confining pressure to the rock sample, and cannot fully simulate the stress situation of the rock sample in the formation, resulting in inaccurate measurement results. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the force application field of the conventional holder in the prior art cannot fully simulate the stress situation of the rock sample in the formation, so as to provide a three-axis holder for a nuclear magnetic resonance system.

[0006] To solve the above technical problem, the three-axis holder for a nuclear magnetic resonance system provided by the present invention includes:

[0007] A clamping main body having an accommodation cavity for placing a sample;

[0008] Two plugging components respectively arranged at both ends of the accommodation cavity;

[0009] The plugging component includes: an axial pressure push rod and an axial pressure end cover. The axial pressure end cover has a confining pressure through hole communicating the outside with the accommodation cavity; the axial pressure push rod can slide axially through the axial pressure end cover and partially extend into the accommodation cavity, and a displacement through hole communicating the outside with the accommodation cavity is arranged inside the axial pressure push rod.

[0010] As a preferred solution, the axial compression push rod has a driving flange extending radially outward, the axial compression end cover has a driving groove adapted for the driving flange of the axial compression push rod to slide axially, and the axial compression end cover further has an axial compression through hole communicating the outside with the driving groove.

[0011] As a preferred solution, there are at least two displacement through holes inside the axial compression push rod, including a first displacement through hole arranged at the center of the axial compression push rod and second displacement through holes arranged at intervals around the first displacement through hole.

[0012] As a preferred solution, it further includes:

[0013] An axial compression ejector rod, detachably docked at one end of the axial compression push rod facing the inside of the clamping body, and the inside of the axial compression ejector rod has through holes respectively communicating with the displacement through holes;

[0014] A positioning column, having at least one, connected between the axial compression ejector rod and the axial compression push rod, and the connection seams between the positioning column and the axial compression ejector rod and the axial compression push rod are arranged staggered with each other.

[0015] As a preferred solution, it further includes:

[0016] An axial compression cover, connected to the end of the clamping body and pressing the axial compression end cover against the clamping body.

[0017] As a preferred solution, it further includes: an axial force-bearing body, sleeved on the outer wall of the clamping body, and the two ends are respectively connected to the axial compression cover.

[0018] As a preferred solution, it further includes: an annular skeleton, sleeved on the outer wall of the clamping body and having a gap with the outer wall of the clamping body, and a radio frequency coil is adapted to be arranged around the outer wall of the annular skeleton.

[0019] As a preferred solution, the outer wall of the annular skeleton has a positioning groove adapted to accommodate the radio frequency coil.

[0020] As a preferred solution, it further includes: an axial force-bearing body, sleeved on the outer walls of the clamping body and the annular skeleton, and forming an abutment against both ends of the annular skeleton.

[0021] As a preferred solution, sealing rings are respectively arranged at both ends of the annular skeleton, and the sealing rings are inserted between the annular skeleton and the outer wall of the clamping body.

[0022] As a preferred solution, the sealing ring has an abutment platform for abutting against the end of the annular skeleton, and the axial force-bearing body forms an abutment against the sealing ring.

[0023] As a preferred solution, the sealing ring has a coolant receiving groove and a coolant injection hole.

[0024] As a preferred solution, the coolant receiving groove on the sealing ring communicates with the space between the annular skeleton and the clamping body.

[0025] As a preferred solution, the outer wall of the axially stressed body has at least one through groove.

[0026] As a preferred solution, it further includes:

[0027] A shielding cover, detachably covering the outside of the RF coil.

[0028] As a preferred solution, the shielding cover is provided with an electrical connecting member adapted to be connected to the RF coil.

[0029] As a preferred solution, the material of the clamping body is selected as zirconia.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The three-axis gripper for nuclear magnetic resonance system provided by the present invention applies confining pressure to the sample through the confining pressure through-hole, applies axial displacement pressure to the sample through the displacement through-hole, and applies axial pressure to the end face of the sample through the axial sliding of the axial pressure push rod, simulating the full-space stress situation of the sample, making the parameters such as porosity, permeability, and saturation measured by the sample more accurate and reliable.

[0032] 2. The three-axis gripper for nuclear magnetic resonance system provided by the present invention injects pressure oil into the axial pressure through-hole, and the pressure oil pushes the axial pressure push rod; by controlling the pressure of the pressure oil, the pressure acting on the axial pressure push rod is adjusted, and then the axial force applied to the end face of the sample is realized; there is no need to add an additional power device, and the structure is simple and reliable.

[0033] 3. The three-axis gripper for nuclear magnetic resonance system provided by the present invention has at least two displacement through-holes, and different pressure oils can be simultaneously introduced to perform displacement pressure tests on the sample.

[0034] 4. The three-axis gripper for nuclear magnetic resonance system provided by the present invention, the axial pressure ejector rod is detachably connected to the axial pressure push rod, and the end face of the sample is pressed by the axial pressure ejector rod; compared with the integral axial pressure push rod, in the later maintenance and replacement process, only the axial pressure ejector rod needs to be replaced; the positioning column is embedded between the axial pressure ejector rod and the axial pressure push rod and passes through the connection seam between the axial pressure ejector rod and the axial pressure push rod, which is convenient for separating different displacement through-holes and preventing seepage between different displacement through-holes.

[0035] 5. The three-axis gripper for a nuclear magnetic resonance system provided by the present invention, with the axial gland, enhances the holding force of the axial gland cover sealed on the gripper body, avoiding the separation of the axial gland cover from the gripper body during the application of axial pressure.

[0036] 6. When the three-axis gripper for a nuclear magnetic resonance system provided by the present invention applies axial pressure to the end face of the sample, the reaction force generated by the sample indirectly acts on the axial force-bearing body. The axial force-bearing body shares part of the reaction force, thereby increasing the overall strength of the three-axis gripper; in addition, the axial force-bearing body can fix the annular skeleton.

[0037] 7. The three-axis gripper for a nuclear magnetic resonance system provided by the present invention has a gap between the radio frequency coil and the outer wall of the gripper body, reducing the heat transferred from the gripper body to the radio frequency coil.

[0038] 8. The three-axis gripper for a nuclear magnetic resonance system provided by the present invention has positioning grooves on the annular skeleton, realizing the fixation and positioning of the radio frequency coil.

[0039] 9. The three-axis gripper for a nuclear magnetic resonance system provided by the present invention has a sealing ring inserted between the annular skeleton and the outer wall of the gripper body, ensuring a fixed gap between the annular skeleton and the gripper body. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic three-dimensional structure diagram of the three-axis gripper for a nuclear magnetic resonance system provided in the present invention.

[0042] Figure 2 is Figure 1 the front view cross-sectional view of

[0043] Figure 3 It is a schematic three-dimensional structure diagram of the gripper body.

[0044] Figure 4 It is a schematic three-dimensional structure diagram of the axial gland cover.

[0045] Figure 5 is Figure 4 the front view cross-sectional view of

[0046] Figure 6 It is a schematic three-dimensional structure diagram of the axial pressure push rod.

[0047] Figure 7 is Figure 6 the front view cross-sectional view of

[0048] Figure 8 is the three-dimensional structure schematic diagram of the axial pressure ejector rod.

[0049] Figure 9 is Figure 8 the front view cross-sectional view of

[0050] Figure 10 is the front view cross-sectional view of the positioning column.

[0051] Figure 11 is the three-dimensional structure schematic diagram of the axially stressed body.

[0052] Figure 12 is Figure 11 the front view cross-sectional view of

[0053] Figure 13 is the three-dimensional structure schematic diagram of the axial gland.

[0054] Figure 14 is Figure 13 the front view cross-sectional view of

[0055] Figure 15 is the three-dimensional structure schematic diagram of the annular skeleton.

[0056] Figure 16 is the three-dimensional structure schematic diagram of the sealing ring.

[0057] Figure 17 is Figure 16 the front view cross-sectional view of

[0058] Explanation of reference numerals:

[0059] 1. Clamping body; 2. Axially stressed body; 3. Annular skeleton; 4. Axial pressure push rod; 5. Axial pressure ejector rod; 6. Axial pressure end cover; 7. Axial gland; 8. Accommodation cavity; 9. Flat section; 10. First anti-blocking flange; 11. First stepped hole; 12. Second stepped hole; 13. Axial pressure through hole; 14. Surrounding pressure through hole; 15. Driving flange; 16. Sealing gasket ring; 17. First displacement through hole; 18. Second displacement through hole; 19. Second anti-blocking flange; 20. First through hole; 21. Second through hole; 22. Circular groove; 23. Radiation groove; 24. Positioning column; 25. Transition through hole; 26. Third stepped hole; 27. Fourth stepped hole; 28. Through groove; 29. Sleeve; 30. Clamping flange; 31. Stepped groove; 32. Stepped platform; 33. Weight reduction hole; 34. Sealing ring; 35. Positioning groove; 36. Electrical connector; 37. Housing bracket; 38. End plate; 39. Side wall plate; 40. Contact platform; 41. Coolant accommodation groove; 42. Coolant injection hole; 43. Groove. Detailed implementation manners

[0060] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of 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.

[0061] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0062] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0063] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0064] The three-axis gripper for a nuclear magnetic resonance system provided in this embodiment, as Figure 1 , Figure 2 shown, includes: a gripper main body 1, a plugging component, an axial force-bearing body 2, an annular skeleton 3, a radio frequency coil, and a shielding cover; the plugging component includes: an axial pressure push rod 4, an axial pressure top rod 5, an axial pressure end cover 6, and an axial pressure cover 7.

[0065] As Figure 2 , Figure 3 shown, the gripper main body 1 is made of zirconia. The gripper main body 1 is a columnar structure with an axially penetrating accommodation cavity 8 inside, and the accommodation cavity 8 is suitable for placing a sample; flat cut surfaces 9 are symmetrically provided on the outer walls at both ends of the gripper main body 1.

[0066] As Figure 2 , Figure 4 , Figure 5As shown, the outer wall of the axial compression end cap 6 has a first resisting flange 10 extending radially outward, and internally has a first stepped hole 11 and a second stepped hole 12 penetrating axially; one end of the axial compression end cap 6 extends into the accommodation cavity 8, the first resisting flange 10 abuts against the end of the accommodation cavity 8, and the outer wall of the axial compression end cap 6 is hermetically connected to the inner wall of the accommodation cavity 8 through a sealing ring; one end of the axial compression cover 7 facing the first resisting flange 10 has an axial compression through hole 13 and a confining pressure through hole 14, and both the axial compression through hole 13 and the confining pressure through hole 14 are parallel to the axis of the axial compression cover 7; the axial compression through hole 13 connects the outside to the second stepped hole 12; the confining pressure through hole 14 connects the outside to the accommodation cavity 8 of the clamping body 1 and is not connected to the first stepped hole 11 and the second stepped hole 12.

[0067] As Figure 2 , Figure 6 , Figure 7 shown, the axial compression push rod 4 slides through the first stepped hole 11 and the second stepped hole 12 and partially extends into the accommodation cavity 8; the axial compression push rod 4 has a driving flange 15 extending radially outward, and the outer wall of the driving flange 15 is in contact and sliding connection with the second stepped hole 12; a driving groove is formed between the driving flange 15 and the inner stepped surface of the axial compression end cap 6, and the axial compression through hole 13 is connected to the driving groove; a sealing gasket ring 16 is provided between the driving flange 15 and the inner stepped surface of the axial compression end cap 6, and the sealing gasket ring 16 is in sliding seal with the second stepped hole 12; the outer wall of the driving flange 15 and the second stepped hole 12 are in sliding seal through a sealing ring, and the outer wall of the axial compression push rod 4 and the first stepped hole 11 are in sliding seal through a sealing ring. The interior of the axial compression push rod 4 is provided with a first displacement through hole 17 and a second displacement through hole 18 at intervals, and the first displacement through hole 17 penetrates the axis of the axial compression push rod 4.

[0068] As Figure 2 , Figure 8 , Figure 9 , a shaft compression ejector rod 5 is threadedly connected to the end of the axial compression push rod 4 facing the inside of the clamping body 1, and the shaft compression ejector rod 5 is made of zirconia; the shaft compression ejector rod 5 has a second resisting flange 19 extending radially outward, and the second resisting flange 19 abuts against the end of the axial compression push rod 4; there is a gap between the outer wall of the second resisting flange 19 and the inner wall of the accommodation cavity 8 of the clamping body 1, and the confining pressure through hole 14 is connected to the accommodation cavity 8 through the gap. The interior of the shaft compression ejector rod 5 has a first through hole 20 and a second through hole 21 respectively connecting the first displacement through hole 17 and the second displacement through hole 18, and a circular groove 22 is provided on the end surface of the shaft compression ejector rod 5, and the circular groove 22 is connected to the first through hole 20 and the second through hole 21 through a radiation groove 23.

[0069] As Figure 2 、 Figure 10 shown, a positioning column 24 is connected between the first displacement through hole 17 and the first through hole 20. One end of the positioning column 24 is embedded in the first through hole 20, and the other end is embedded in the first displacement through hole 17. A transition through hole 25 communicating the first displacement through hole 17 and the first through hole 20 is provided inside the positioning column 24. The outer wall of the positioning column 24 is hermetically connected to the first displacement through hole 17 and the first through hole 20 respectively through a sealing ring.

[0070] As Figure 2 、 Figure 11 、 Figure 12 shown, the axial force-bearing body 2 is of a cylindrical structure and is sleeved on the outer wall of the clamping main body 1. External threads are provided at both ends of the axial force-bearing body 2. A third stepped hole 26 and a fourth stepped hole 27 penetrating axially are provided inside the axial force-bearing body 2. Four through grooves 28 are symmetrically provided on the outer wall of the fourth stepped hole 27 to facilitate the installation and adjustment of the annular skeleton 3 through the through grooves 28. The inner wall of the fourth stepped hole 27 abuts against the outer wall of the clamping main body 1 through a sleeve 29. A clamping flange 30 abutting against the flat section 9 of the clamping main body 1 is provided on the inner wall of the sleeve 29. The clamping flange 30 abuts and blocks between the first resisting flange 10 of the axial pressure end cover 6 and the clamping main body 1. An interval suitable for installing the annular hanger is provided between the inner wall of the fourth stepped hole 27 and the outer wall of the clamping main body 1.

[0071] As Figure 2 、 Figure 13 、 Figure 14 , a through stepped groove 31 is provided inside the axial pressure cover 7. The axial pressure cover 7 is sleeved on the outer wall of the axial force-bearing body 2. The first resisting flange 10 of the axial pressure end cover 6 abuts against the stepped platform 32 of the stepped groove 31. The axial pressure cover 7 presses the axial pressure end cover 6 against the clamping main body 1 by being threadedly connected to the axial force-bearing body 2. The axial pressure cover 7 is made of titanium alloy, and a weight-reducing hole 33 is provided at the outer end of the axial pressure cover 7.

[0072] As Figure 2 、 Figure 15As shown, the annular skeleton 3 is made of polytetrafluoroethylene and is sleeved on the outer wall of the clamping body 1. The two ends are respectively abutted against the axial force body 2 through the sealing rings 34, and there is a gap between the outer wall of the clamping body 1; there are a plurality of positioning grooves 35 on the outer wall of the annular skeleton 3 suitable for accommodating the radio frequency coil, and the radio frequency coil is sleeved on the annular skeleton 3. The shielding cover is connected to the outer wall of the axial force body 2 by screws, that is, it covers the outside of the radio frequency coil to prevent the radio frequency coil from radiating to the outside; there is an electrical connector 36 on the inner wall of the shielding cover suitable for connecting to the radio frequency coil to prevent the wire from being pulled out when placed outside. As Figure 1 shown, the shielding cover is a cuboid frame structure, including: a housing bracket 37, an end plate 38 and a side wall plate 39.

[0073] As Figure 2 , Figure 16 , Figure 17 shown, the outer wall of the sealing ring 34 is stepped. One end is inserted between the annular skeleton 3 and the outer wall of the clamping body 1 and is hermetically connected to the clamping body 1 through a sealing ring. The other end has an abutting platform 40 suitable for abutting against the end of the annular skeleton 3. The sealing ring 34 realizes the axial limit of the annular skeleton 3; there is a coolant accommodating groove 41 and a coolant injection hole 42 on the sealing ring 34, and the coolant injection hole 42 is communicated with the coolant accommodating groove 41; there are a plurality of grooves 43 on the inner side wall of the sealing ring 34, and the grooves 43 are communicated between the coolant accommodating groove 41 and the gap between the annular skeleton 3 and the clamping body 1. The heat on the outer wall of the clamping body 1 is conducted to the annular skeleton 3 through the sealing ring 34, and the coolant cools the sealing ring 34 through the coolant injection hole 42, thereby reducing the heat conduction phenomenon; and the coolant can flow into the gap between the annular skeleton 3 and the clamping body 1 through the coolant accommodating groove 41 to cool down the clamping body 1 and reduce the radiant heat to the annular skeleton 3.

[0074] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A three-axis clamp for a nuclear magnetic resonance system, characterized in that: include: A clamping body (1) having a receiving cavity (8) for placing a sample; There are two blocking components, which are respectively arranged at two ends of the accommodating cavity (8); The sealing assembly comprises: an axial pressure push rod (4) and an axial pressure end cover (6), wherein the axial pressure end cover (6) has a confining pressure through hole (14) communicating with the outside world and the accommodating cavity (8); the axial pressure push rod (4) can slide through the axial pressure end cover (6) in the axial direction and partially extend into the accommodating cavity (8), and the interior of the axial pressure push rod (4) has a displacement through hole communicating with the outside world and the accommodating cavity (8); The axial pressure push rod (4) has a driving flange (15) extending radially outward, the axial pressure end cover (6) has a driving groove suitable for the driving flange (15) of the axial pressure push rod (4) to slide axially, and the axial pressure end cover (6) also has an axial pressure through hole (13) communicating with the outside world and the driving groove; The outer wall of the axial pressure end cover (6) has a first resisting flange (10) extending radially outward, and the interior has a first stepped hole (11) and a second stepped hole (12) extending axially; one end of the axial pressure end cover (6) extends into the accommodating cavity (8); the axial pressure through hole (13) and the confining pressure through hole (14) are located at one end of the axial pressure cover (7) facing the first resisting flange (10); the outer wall of the axial pressure push rod (4) is slidably sealed with the first stepped hole (11), and the axial pressure through hole (13) is connected to the outside and the second stepped hole (12).

2. The three-axis clamp for a nuclear magnetic resonance system according to claim 1, characterized in that: The axial pressure push rod (4) has at least two displacement through holes inside, including a first displacement through hole (17) arranged at the center of the axial pressure push rod (4) and a second displacement through hole (18) arranged at intervals around the first displacement through hole (17).

3. The three-axis clamp for a nuclear magnetic resonance system according to claim 2, characterized in that: Also includes: An axial pressure push rod (5) is detachably connected to one end of the axial pressure push rod (4) facing the interior of the clamping body (1), and the interior of the axial pressure push rod (5) has through holes respectively connected to the displacement through holes; The positioning column (24) has at least one, which is connected between the axial pressure push rod (5) and the axial pressure push rod (4), and the connection seams between the positioning column (24) and the axial pressure push rod (5) and the axial pressure push rod (4) are respectively arranged in an alternating manner with the connection seams between the axial pressure push rod (5) and the axial pressure push rod (4).

4. The three-axis clamp for a nuclear magnetic resonance system according to claim 1, characterized in that: Also includes: An axial pressure cover (7) is connected to the end of the clamping body (1) and presses the axial pressure end cover (6) onto the clamping body (1).

5. The three-axis clamp for a nuclear magnetic resonance system according to claim 4, characterized in that: Also includes: The axial force-bearing body (2) is sleeved on the outer wall of the clamping body (1), and its two ends are respectively connected to the axial pressure cover (7).

6. The three-axis clamp for a nuclear magnetic resonance system according to any one of claims 1 to 5, characterized in that: Also includes: The annular skeleton (3) is sleeved on the outer wall of the clamping body (1) and has a gap between the outer wall of the clamping body (1). The outer wall of the annular skeleton (3) is suitable for surrounding a radio frequency coil.

7. The three-axis clamp for a nuclear magnetic resonance system according to claim 6, characterized in that: The outer wall of the annular skeleton (3) is provided with a positioning groove (35) suitable for accommodating the radio frequency coil.

8. The three-axis clamp for a nuclear magnetic resonance system according to claim 7, characterized in that: Also includes: The axial force-bearing body (2) is sleeved on the outer walls of the clamping body (1) and the annular skeleton (3), and abuts against both ends of the annular skeleton (3).

9. The three-axis clamp for a nuclear magnetic resonance system according to claim 7, characterized in that: Sealing rings (34) are respectively provided at both ends of the annular skeleton (3), and the sealing rings (34) are inserted between the annular skeleton (3) and the outer wall of the clamping body (1).

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