High-precision sampling system and nuclear magnetic resonance equipment

Abstract

The invention relates to the technical field of nuclear magnetic resonance spectrometer, in particular to a high-precision sample introduction system and nuclear magnetic resonance equipment, and the high-precision sample introduction system comprises a rotary sample disc and a clamping assembly. M circles of sample storage holes are formed in the rotating sample disc, each circle of sample storage holes comprises a plurality of sample storage holes which are sequentially formed around the rotating center of the rotating sample disc at intervals in the circumferential direction, M is a positive integer larger than 1, and the sample storage holes are used for storing sample tubes. The clamping assembly comprises a clamping jaw assembly, and the clamping jaw assembly can clamp or loosen the sample tube, so that the clamping jaw assembly can change samples with the rotary sample disc. The clamping jaw assembly is provided with N clamping positions, the N clamping positions can be aligned with the sample storage holes in different circles respectively, N is a positive integer larger than 1, and / or the clamping assembly comprises a movable driving part, and the movable driving part can drive the clamping jaw assembly to move so that the clamping positions can be aligned with the sample storage holes in different circles. The nuclear magnetic resonance equipment comprises the high-precision sampling system.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear magnetic resonance spectrometers, and in particular to a high-precision sample introduction system and a nuclear magnetic resonance device. Background Art

[0002] The frequency of nuclear magnetic resonance (NMR) is linearly related to the magnetic field strength, meaning that as the magnetic field strength increases, the resonance frequency increases simultaneously. Therefore, high-field (high-frequency) NMR can significantly improve resolution, increasing the frequency difference corresponding to the chemical shift difference. Furthermore, high magnetic fields increase the energy level splitting, making the difference between the number of high- and low-energy state particles more significant, thereby improving the signal-to-noise ratio and making NMR measurements more sensitive. For example, low-field NMR is mostly used for routine organic analysis, while high-field NMR can be used for detailed analysis of the structure of macromolecules such as proteins.

[0003] The pursuit of high magnetic field strength in nuclear magnetic resonance results in a large-volume cavity structure for the superconducting magnet system, while the sample detection area is strictly limited to a uniform field with a millimeter diameter at the center of the magnet. This requires that the sampling system must be able to ensure millimeter-level positioning accuracy.

[0004] The sample introduction system includes a rotating sample tray and a gripper assembly, which exchanges samples between the gripper assembly and the rotating sample tray. Existing rotating sample trays have only a single ring of sample wells, which not only limits the unattended operation cycle, but also, when the total number of sample wells remains constant and the spacing between adjacent wells remains constant, a moderate increase in the number of sample wells will reduce the outer radius of the rotating sample tray. Even if the rotating sample tray's drive mechanism uses a high-resolution encoder, its minimum precisely controllable rotation angle (i.e., step) is limited. Therefore, a larger radius of the rotating sample tray actually makes it more difficult to precisely control its rotational accuracy. Summary of the Invention

[0005] One object of the present invention is to provide a high-precision sample injection system to help improve the accuracy of sample injection and sample replacement.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Provided is a high-precision sample injection system, including:

[0008] A rotating sample disk, wherein the rotating sample disk is provided with M circles of sample storage holes, each circle of the sample storage holes comprising a plurality of the sample storage holes sequentially arranged circumferentially around the rotation center of the rotating sample disk, M being a positive integer greater than 1, and the sample storage holes being used to store sample tubes;

[0009] A gripping assembly, comprising a gripping jaw assembly, wherein the gripping jaw assembly is capable of gripping or releasing the sample tube so as to enable sample exchange between the gripping jaw assembly and the rotating sample disk;

[0010] The clamping jaw assembly has N clamping positions, and the N clamping positions can be aligned with different circles of sample storage holes respectively, N is a positive integer greater than 1, and / or the clamping assembly includes a mobile driving member, and the mobile driving member can drive the clamping jaw assembly to move so that the clamping positions are aligned with different circles of sample storage holes.

[0011] Optionally, the clamping jaw assembly has two clamping positions, and a connecting line of the two clamping positions projected toward the rotating sample disk coincides with a radial direction of the rotating sample disk.

[0012] Optionally, along the radial direction of the rotating sample disk, the distance between at least two adjacent circles of the sample storage holes is d0, and the distance between two clamping positions is d1, where d1=d0.

[0013] Optionally, the clamping jaw assembly is movable along a first direction, which is perpendicular to the disk surface of the rotating sample disk.

[0014] Optionally, the clamping jaw assembly includes two clamping jaw members, and the distance between any two adjacent sample storage holes is greater than the maximum distance between the two clamping jaw members.

[0015] Optionally, the sample storage holes on the rotating sample disk include a first circle, a second circle, a third circle and a fourth circle arranged in sequence, the clamping jaw assembly has two clamping positions, and the clamping assembly includes the mobile driving member, the mobile driving member can drive the two clamping positions to correspond to the sample storage holes on the first circle and the sample storage holes on the second circle respectively, and the mobile driving member can also drive the two clamping positions to correspond to the sample storage holes on the third circle and the sample storage holes on the fourth circle respectively.

[0016] Optionally, a first trajectory of the movement of the clamping assembly driven by the mobile driving member is parallel to the disk surface of the rotating sample disk, and the first trajectory coincides with the radial direction of the rotating sample disk. The driving stroke of the mobile driving member is d2. Along the radial direction of the rotating sample disk, the distance between the first circle and the third circle is d3, and d3=d2.

[0017] And / or, the distance between the second circle and the fourth circle is d4, d4=d2.

[0018] Optionally, the first virtual holes of the sample storage holes of the first circle shifted along the radial direction of the rotating sample disk to the second circle do not overlap with any of the sample storage holes on the second circle;

[0019] And / or, the second virtual holes of the sample storage holes of the second circle shifted along the radial direction of the rotating sample disk to the first circle do not overlap with any of the sample storage holes on the first circle;

[0020] And / or, the third virtual holes of the sample storage holes of the third circle shifted along the radial direction of the rotating sample disk to the fourth circle do not overlap with any of the sample storage holes on the fourth circle;

[0021] And / or, the fourth virtual holes of the sample storage holes of the fourth circle shifted along the radial direction of the rotating sample disk to the third circle do not overlap with any of the sample storage holes on the third circle.

[0022] Optionally, the first virtual hole is located in the middle of the sample storage holes on two adjacent second circles;

[0023] And / or, the second virtual hole is located between the sample storage holes on two adjacent first circles;

[0024] And / or, the third virtual hole is located between the sample storage holes on two adjacent fourth circles;

[0025] And / or, the fourth virtual hole is located in the middle of the sample storage holes on two adjacent third circles.

[0026] Optionally, the clamping assembly further includes a clamping driver, which is used to drive the clamping jaw assembly to clamp or release the sample tube, and the clamping driver is connected to the output end of the moving driver.

[0027] Optionally, the clamping drive member is a gas cylinder, and the clamping assembly further comprises a first gas block, wherein the first gas block is connected to a housing of the clamping drive member, and a first gas cavity in the first gas block is connected to a gas inlet of the clamping drive member;

[0028] And / or, the movable driving member is a cylinder, and the clamping assembly further includes a second gas block, the second gas block is connected to the housing of the movable driving member, and the second air cavity in the second gas block is connected to the gas inlet of the movable driving member.

[0029] Optionally, the clamping assembly further includes an airtight cannula, one end of which is movably inserted on the first air block so that the inner cavity of the airtight cannula is connected to the first air cavity, and the other end of the airtight cannula is movably inserted on the second air block so that the inner cavity of the airtight cannula is connected to the second air cavity.

[0030] Optionally, a sample transfer component is further included, and the sample transfer component includes a sample transfer tube, and the sample transfer tube is used to exchange samples with the clamping component.

[0031] Optionally, the sample transfer assembly further includes a sample transfer drive and a hook assembly, wherein the sample transfer drive is used to drive the sample transfer tube to move forward to exchange samples with the clamping assembly, and the hook assembly can block the sample transfer drive from driving the sample transfer tube to move or the hook assembly can push the sample transfer tube to move in the opposite direction, and the driving force of the hook assembly is greater than the driving force of the sample transfer drive, so that the sample transfer tube can correspond to any one of the clamping positions.

[0032] Optionally, the blocking hook assembly includes a blocking hook driving member and a blocking hook member, wherein the blocking hook driving member is used to drive the blocking hook member, and the blocking hook member is used to block or push the sample transfer tube.

[0033] Optionally, the direction in which the blocking hook driving member drives the blocking hook member to move is in a straight line with the direction in which the sample transfer driving member drives the sample transfer tube to move.

[0034] Optionally, when the blocking hook driving member reaches one end of the driving stroke, the sample transfer tube corresponds to one clamping position, and when the blocking hook driving member reaches the other end of the driving stroke, the sample transfer tube corresponds to another clamping position;

[0035] And / or, the distance between the two clamping positions is d1, the driving stroke of the movable driving member is d2, and the driving stroke of the hook driving member is d2-d1.

[0036] Optionally, the clamping assembly further includes a first driving member, the first driving member is used to drive the clamping jaw assembly to move along a first direction, and the sample transfer driving member is used to drive the sample transfer tube to move along a second direction, and the first direction is not parallel to the second direction.

[0037] Optionally, the apparatus further comprises a first detection member, wherein the first detection member is used to detect whether the clamping jaw assembly is located at a first intersection position, so that the clamping jaw assembly can avoid the movement of the sample transfer tube along the second direction;

[0038] And / or, it further includes a second detection member, which is used to detect whether the sample transfer tube is located at a second intersection position, so that the sample transfer tube can avoid the movement of the clamping jaw assembly along the first direction.

[0039] Another object of the present invention is to provide a nuclear magnetic resonance device that helps to ensure the sampling and sample replacement accuracy of the sampling system.

[0040] To achieve this object, the present invention adopts the following technical solutions:

[0041] A nuclear magnetic resonance device is provided, comprising the above-mentioned high-precision sample introduction system.

[0042] Beneficial effects of the present invention:

[0043] The present invention provides a high-precision sample injection system, comprising a rotating sample disk and a clamping assembly. The rotating sample disk is provided with M circles of sample storage holes, each circle of sample storage holes comprising a plurality of sample storage holes spaced circumferentially around the rotation center of the rotating sample disk, where M is a positive integer greater than 1. The sample storage holes are used to store sample tubes. The clamping assembly includes a clamping jaw assembly capable of clamping or releasing a sample tube to enable sample exchange between the clamping jaw assembly and the rotating sample disk. The clamping jaw assembly has N clamping positions, each of which can be aligned with different circles of sample storage holes, where N is a positive integer greater than 1. Furthermore, the clamping assembly includes a movable drive element capable of driving the clamping jaw assembly to move so that the clamping positions are aligned with different circles of sample storage holes. Providing more than one circle of sample storage holes allows for a reduced outer radius of the rotating sample disk. When the drive element of the rotating sample disk uses an encoder of the same precision, the smaller the outer radius of the rotating sample disk, the higher the rotation precision. Therefore, the high-precision sample injection system helps improve sample injection and exchange precision.

[0044] The present invention also provides a nuclear magnetic resonance device including the above-mentioned high-precision sample introduction system. The nuclear magnetic resonance device helps to ensure that the sample introduction system has higher sample introduction and sample replacement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic structural diagram of a nuclear magnetic resonance apparatus provided by an embodiment of the present invention;

[0046] Figure 2 This is a partial structural diagram of a clamping assembly provided by an embodiment of the present invention from a first perspective;

[0047] Figure 3 1 is a schematic structural diagram of a rotating sample disk provided in an embodiment of the present invention;

[0048] Figure 4 is a partial structural diagram of a clamping assembly provided by an embodiment of the present invention from a second perspective;

[0049] Figure 5 yes Figure 4 Middle AA section view;

[0050] Figure 6 Schematic diagram of the structure of the clamping assembly and the sample transfer assembly provided in an embodiment of the present invention;

[0051] Figure 7 1 is a partial schematic diagram of a sample transfer drive member and a hook assembly provided in an embodiment of the present invention;

[0052] Figure 8 It is a schematic diagram of the coordination between the clamping assembly and the sample transfer tube provided in an embodiment of the present invention.

[0053] In the picture:

[0054] 1. Rotating sample plate; 101, first rotation; 1011, sample storage hole; 102, second rotation; 103, third rotation; 104, fourth rotation;

[0055] 2. Clamping jaw assembly; 21. First clamping position; 22. Second clamping position;

[0056] 3. Mobile driver; 4. Clamping driver; 5. First air block; 51. First air cavity; 6. Second air block; 61. Second air cavity; 7. Airtight cannula; 8. Sample transfer tube; 9. Sample transfer driver; 10. Hook driver; 11. Hook member; 12. First driver;

[0057] 100, high-precision sample injection system; 200, superconducting magnet system; 900, sample tube. DETAILED DESCRIPTION

[0058] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only show portions relevant to the present invention, not all of them.

[0059] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0060] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0061] The frequency of nuclear magnetic resonance (NMR) is linearly related to the magnetic field strength, meaning that as the magnetic field strength increases, the resonance frequency increases simultaneously. Therefore, high-field (high-frequency) NMR can significantly improve resolution, increasing the frequency difference corresponding to the chemical shift difference. Furthermore, high magnetic fields increase the energy level splitting, making the difference between the number of high- and low-energy state particles more significant, thereby improving the signal-to-noise ratio and making NMR measurements more sensitive. For example, low-field NMR is mostly used for routine organic analysis, while high-field NMR can be used for detailed analysis of the structure of macromolecules such as proteins.

[0062] The pursuit of high magnetic field strength in nuclear magnetic resonance results in a large-volume cavity structure for the superconducting magnet system, while the sample detection area is strictly limited to a uniform field with a millimeter diameter at the center of the magnet. This requires that the sampling system must be able to ensure millimeter-level positioning accuracy.

[0063] The sample introduction system includes a rotating sample tray and a gripper assembly, which exchanges samples between the gripper assembly and the rotating sample tray. Existing rotating sample trays have only a single ring of sample wells, which not only limits the unattended operation cycle, but also, when the total number of sample wells remains constant and the spacing between adjacent wells remains constant, a moderate increase in the number of sample wells will reduce the outer radius of the rotating sample tray. Even if the rotating sample tray's drive mechanism uses a high-resolution encoder, its minimum precisely controllable rotation angle (i.e., step) is limited. Therefore, a larger radius of the rotating sample tray actually makes it more difficult to precisely control its rotational accuracy.

[0064] In order to solve the above problems, this embodiment provides a high-precision sample injection system 100, which helps to improve the accuracy of sample injection and sample replacement.

[0065] like Figures 1-8 As shown, the high-precision sample injection system 100 of this embodiment includes a rotating sample disk 1 and a clamping assembly. The rotating sample disk 1 is provided with M circles of sample storage holes 1011, and each circle of sample storage holes 1011 includes a plurality of sample storage holes 1011 arranged in sequence along the circumferential direction around the rotation center of the rotating sample disk 1, where M is a positive integer greater than 1, and the sample storage holes 1011 are used to store sample tubes 900. The clamping assembly includes a clamping jaw assembly 2, which can clamp or release the sample tube 900 so that the clamping jaw assembly 2 can exchange samples with the rotating sample disk 1. The clamping jaw assembly 2 has N clamping positions, and the N clamping positions can be aligned with different circles of sample storage holes 1011, respectively, where N is a positive integer greater than 1, and / or the clamping assembly includes a moving drive 3, which can drive the clamping jaw assembly 2 to move so that the clamping position is aligned with different circles of sample storage holes 1011.

[0066] By providing more than one circle of sample storage holes 1011, it is possible to reduce the outer radius of the rotating sample disk 1. When the driving part of the rotating sample disk 1 uses an encoder with the same precision, the smaller the outer radius of the rotating sample disk 1, the higher the rotation accuracy. Therefore, the high-precision sampling system 100 helps to improve the sampling and sample changing accuracy.

[0067] Furthermore, in some embodiments, the clamping jaw assembly 2 has N clamping positions, but the clamping assembly is not provided with a movable drive member 3. Multiple clamping positions are provided by a pair of clamping jaw assemblies 2, and at least some of the multiple clamping positions can correspond to M circles of sample storage wells 1011, respectively. That is, the center of each clamping position just falls on the line connecting the centers of different circles of sample storage wells 1011. As long as the M circles of sample storage wells 1011 are staggered, only one clamping position of the multiple clamping positions of the clamping jaw assembly 2 can correspond to a certain circle of target sample storage wells 1011 at a time, thereby enabling accurate sample replacement. Since the clamping position of the clamping jaw assembly 2 does not change, the position of the M circles of sample storage wells 1011 also does not change, and thus the accuracy of the correspondence between the two can be guaranteed to a certain extent.

[0068] In other embodiments, the clamping assembly 2 has only one clamping position, but the clamping assembly further includes a movable driving member 3, which can drive the clamping assembly 2 to move so that the only clamping position of the clamping assembly 2 is aligned with sample storage holes 1011 in different circles.

[0069] In this embodiment, the clamping jaw assembly 2 not only has N clamping positions, that is, at least two clamping positions, but the clamping assembly also includes a moving drive member 3, which can drive the clamping jaw assembly 2 to move.

[0070] Optionally, the clamping jaw assembly 2 can move along a first direction, which is perpendicular to the surface of the rotating sample tray 1. In this embodiment, the surface of the rotating sample tray 1 is horizontally arranged, and the first direction is a vertical direction.

[0071] Optionally, the clamping assembly further includes a first driving member 12, which is used to drive the jaw assembly 2 to move in a first direction. Optionally, the first driving member 12 is a vertical cylinder. Optionally, the rotating sample disk 1 is located at the lower part of the vertical track of the jaw assembly 2, and the first driving member 12 can drive the jaw assembly 2 to move downward in the vertical direction to approach the rotating sample disk 1. The jaw assembly 2 can then release the sample tube 900 so that the sample tube 900 falls into the empty sample storage hole 1011 on the rotating sample disk 1. The jaw assembly 2 can also clamp a new sample tube 900 on the rotating sample disk 1 to achieve sample exchange between the jaw assembly 2 and the rotating sample disk 1.

[0072] Optionally, in this embodiment, the clamping jaw assembly 2 has two clamping positions, and a line connecting the two clamping positions projected toward the rotating sample disk 1 coincides with a radial direction of the rotating sample disk 1. Optionally, a line connecting the two clamping positions extends in a horizontal direction.

[0073] Alternatively, as Figure 3 As shown, in this embodiment, the sample storage holes 1011 on the rotating sample disk 1 include a first circle 101, a second circle 102, a third circle 103 and a fourth circle 104 arranged in sequence, and the first circle 101, the second circle 102, the third circle 103 and the fourth circle 104 are arranged in sequence from the inside to the outside.

[0074] like Figure 3 As shown, optionally, along the radial direction of the rotating sample disk 1, the distance between at least two adjacent circles of sample storage wells 1011 is d0, and the distance between the two clamping positions is d1, where d1 = d0. That is, when the corresponding positions are appropriate, the first clamping position 21 and the second clamping position 22 can correspond to two adjacent circles of sample storage wells 1011, respectively. That is, the centers of the first clamping position 21 and the second clamping position 22 can simultaneously fall on the line connecting the centers of the two adjacent circles of sample storage wells 1011.

[0075] Optionally, in this embodiment, along the radial direction of the rotating sample disk 1 , the distance between the first circle 101 and the second circle 102 is d0 , and the distance between the third circle 103 and the fourth circle 104 is d0 .

[0076] Optionally, the mobile driver 3 can drive two clamping positions to correspond to the sample wells 1011 on the first circle 101 and the sample wells 1011 on the second circle 102, respectively. The mobile driver 3 can also drive two clamping positions to correspond to the sample wells 1011 on the third circle 103 and the sample wells 1011 on the fourth circle 104, respectively. That is, when the mobile driver 3 drives the first clamping position 21 to correspond to the sample wells 1011 of the first circle 101, the second clamping position 22 just corresponds to the sample wells 1011 of the second circle 102. When the mobile driver 3 drives the first clamping position 21 to correspond to the sample wells 1011 of the third circle 103, the second clamping position 22 just corresponds to the sample wells 1011 of the fourth circle 104.

[0077] It can be seen that in the above design, as long as the mobile driving member 3 has two precise positioning points, it can ensure that the clamping jaw assembly 2 and the sample storage holes 1011 on the first circle 101, the second circle 102, the third circle 103 and the fourth circle 104 can all accurately change samples.

[0078] Optionally, the movable driving member 3 is a cylinder, which has only two precise positioning points during the cylinder driving process, namely, the two ends of the driving stroke corresponding to the cylinder.

[0079] Optionally, the first trajectory of the movement of the clamping assembly 2 driven by the mobile driving member 3 is parallel to the disk surface of the rotating sample disk 1 , and the first trajectory coincides with the radial direction of the rotating sample disk 1 .

[0080] Therefore, optionally, the driving stroke of the mobile driving member 3 is d2, and the distance between the first circle 101 and the third circle 103 along the radial direction of the rotating sample disk 1 is d3, where d3 = d2. Furthermore, since the distance between the first circle 101 and the second circle 102 along the radial direction of the rotating sample disk 1 is d0, and the distance between the third circle 103 and the fourth circle 104 is also d0, the distance between the second circle 102 and the fourth circle 104 is d4, where d4 = d2.

[0081] When the above conditions are met, it can be ensured that when the mobile driving member 3 executes to one end of the driving stroke, the first clamping position 21 just corresponds to the first circle 101, and the second clamping position 22 just corresponds to the second circle 102; when the mobile driving member 3 executes to the other end of the driving stroke, the first clamping position 21 just corresponds to the third circle 103, and the second clamping position 22 just corresponds to the fourth circle 104. The four circles of sample storage holes 1011 can all accurately correspond to the clamping positions, thereby ensuring that the sample replacement accuracy between the clamping jaw assembly 2 and the rotating sample disk 1 meets the requirements of the nuclear magnetic resonance equipment.

[0082] In order to place only one sample tube 900 at a time, or to clamp one sample tube 900, the sample storage holes 1011 of the first circle 101 and the second circle 102 need to avoid each other, and the sample storage holes 1011 of the third circle 103 and the fourth circle 104 also need to avoid each other.

[0083] Optionally, the first virtual holes of the sample storage wells 1011 of the first circle 101 that are shifted along the radial direction of the rotating sample disk 1 to the second circle 102 do not overlap with any of the sample storage wells 1011 on the second circle 102. That is, when a certain sample storage well 1011 of the first circle 101 is shifted along the radial direction of the rotating sample disk 1 to the second circle 102, a first virtual hole located in the second circle 102 is obtained, and this first virtual hole does not overlap with any of the sample storage wells 1011 on the second circle 102. That is, this first virtual hole is located between two adjacent sample storage wells 1011 on the second circle 102 and is spaced apart from both of these sample storage wells 1011. And for any sample storage hole 1011 of the first circle 101, it meets the above description, which can ensure that when the clamping jaw assembly 2 clamps the sample tube 900 in the sample storage hole 1011 on the first circle 101, although the second clamping position 22 of the clamping jaw assembly 2 corresponds to the second circle 102, the clamping jaw assembly 2 will not touch the sample tube 900 in the sample storage hole 1011 of the second circle 102.

[0084] Optionally, the second virtual holes of the sample storage wells 1011 of the second circle 102 that are shifted along the radial direction of the rotating sample disk 1 to the first circle 101 do not overlap with any of the sample storage wells 1011 on the first circle 101. That is, when a sample storage well 1011 of the second circle 102 is shifted along the radial direction of the rotating sample disk 1 to the first circle 101, a second virtual hole located in the first circle 101 is obtained, and the second virtual hole does not overlap with any of the sample storage wells 1011 on the first circle 101. That is, the second virtual hole is located between two adjacent sample storage wells 1011 on the first circle 101 and is spaced apart from both sample storage wells 1011. And for any sample storage hole 1011 of the second circle 102, it meets the above description, which can ensure that when the clamping jaw assembly 2 clamps the sample tube 900 in the sample storage hole 1011 on the second circle 102, although the first clamping position 21 of the clamping jaw assembly 2 corresponds to the first circle 101, the clamping jaw assembly 2 will not touch the sample tube 900 in the sample storage hole 1011 of the first circle 101.

[0085] Optionally, the third virtual holes of the sample storage wells 1011 of the third circle 103 that are shifted along the radial direction of the rotating sample disk 1 to the fourth circle 104 do not overlap with any of the sample storage wells 1011 on the fourth circle 104. That is, when a certain sample storage well 1011 of the third circle 103 is shifted along the radial direction of the rotating sample disk 1 to the fourth circle 104, a third virtual hole located in the fourth circle 104 is obtained. This third virtual hole does not overlap with any of the sample storage wells 1011 on the fourth circle 104, that is, the third virtual hole is located between two adjacent sample storage wells 1011 on the fourth circle 104 and is spaced apart from both of these sample storage wells 1011. And for any sample storage hole 1011 of the third circle 103, it meets the above description, which can ensure that when the clamping jaw assembly 2 clamps the sample tube 900 in the sample storage hole 1011 on the third circle 103, although the second clamping position 22 of the clamping jaw assembly 2 corresponds to the fourth circle 104, the clamping jaw assembly 2 will not touch the sample tube 900 in the sample storage hole 1011 of the fourth circle 104.

[0086] Optionally, the fourth virtual holes of the sample storage wells 1011 of the fourth circle 104 that are shifted radially along the rotating sample disk 1 to the third circle 103 do not overlap with any of the sample storage wells 1011 on the third circle 103. That is, when a certain sample storage well 1011 of the fourth circle 104 is shifted radially along the rotating sample disk 1 to the third circle 103, a fourth virtual hole located in the third circle 103 is obtained. This fourth virtual hole does not overlap with any of the sample storage wells 1011 on the third circle 103, that is, this fourth virtual hole is located between two adjacent sample storage wells 1011 on the third circle 103 and is spaced apart from both of these sample storage wells 1011. And for any sample storage hole 1011 of the fourth circle 104, it meets the above description, which can ensure that when the clamping jaw assembly 2 clamps the sample tube 900 in the sample storage hole 1011 on the fourth circle 104, although the first clamping position 21 of the clamping jaw assembly 2 corresponds to the third circle 103, the clamping jaw assembly 2 will not touch the sample tube 900 in the sample storage hole 1011 of the third circle 103.

[0087] In order to further ensure that when a sample tube 900 is clamped, the sample tubes 900 in the adjacent circle are not touched, optionally, the first virtual hole is located in the middle of the sample storage holes 1011 on two adjacent second circles 102. Figure 3 The extension line of the line between the center of hole a1 and the rotation center just passes through the midpoint of the line between the centers of holes b2 and b3.

[0088] Optionally, the second virtual hole is located in the middle of the sample storage holes 1011 on two adjacent first circles 101, that is, Figure 3 The line between the center of hole b1 and the center of rotation just passes through the midpoint of the line between the centers of holes a2 and a3. Figure 3 It is a schematic diagram. For the sake of clarity, the aperture of the sample storage hole 1011 is set larger than the outer diameter of the rotating sample disk 1, so that it appears that when the sample tube 900 in the hole b1 is clamped, it will interfere with the sample tubes 900 in holes a2 and a3. In actual design, the aperture of the sample storage hole 1011 is much smaller than the outer diameter of the rotating sample disk 1 to ensure that when the sample tube 900 in the hole b1 is clamped, it will not interfere with the sample tubes 900 in holes a2 and a3.

[0089] Similarly, optionally, the third virtual hole is located in the middle of the sample storage holes 1011 on two adjacent fourth circles 104. Figure 3 The extension line of the line between the center of the hole c1 and the rotation center just passes through the midpoint of the line between the centers of the holes e2 and e3.

[0090] Optionally, the fourth virtual hole is located in the middle of the sample storage holes 1011 on two adjacent third circles 103. Figure 3The line connecting the center of hole e1 and the center of rotation just passes through the midpoint of the line connecting the centers of holes c2 and c3.

[0091] Optionally, the clamping jaw assembly 2 includes two clamping jaws, and the spacing between any two adjacent sample storage holes 1011 is greater than the maximum distance between the two clamping jaws. It should be noted that the spacing between any two adjacent sample storage holes 1011 mentioned here refers to the minimum distance between the edges of the two adjacent sample storage holes 1011, that is, the spacing distance between the two. If the above conditions are met, it can be ensured that when the sample tube 900 in the clamping hole a1 is clamped, the clamping jaw assembly 2 partially extends between the hole b2 and the hole b3. However, since the spacing distance between the hole b2 and the hole b3 is greater than the maximum distance between the two clamping jaws, and the hole a1 is located on the perpendicular bisector of the line connecting the centers of the circles of the holes b2 and the hole b3, neither of the two clamping jaws will touch the sample tube 900 in the holes b2 and the holes b3.

[0092] Optionally, the clamping assembly further includes a clamping driver 4 , which is used to drive the clamping jaw assembly 2 to clamp or release the sample tube 900 . The clamping driver 4 is connected to the output end of the moving driver 3 .

[0093] Optionally, the clamping drive 4 is a cylinder, and the clamping assembly further includes a first gas block 5 , which is connected to the housing of the clamping drive 4 , and the first air cavity 51 in the first gas block 5 is connected to the gas inlet of the clamping drive 4 .

[0094] Optionally, the mobile driving member 3 is a cylinder, and the clamping assembly further includes a second gas block 6 , which is connected to the housing of the mobile driving member 3 , and the second air cavity 61 in the second gas block 6 is connected to the gas inlet of the mobile driving member 3 .

[0095] The driving stroke of the mobile driving member 3 occasionally deviates. After various tests and investigations, it was found that the reason was that the air hose of the clamping driving member 4 was pulled, bent and blocked. To solve this problem, the clamping assembly can optionally further include an airtight cannula 7, such as Figure 2 、 Figure 4 and Figure 5 As shown, one end of the airtight cannula 7 can be movably inserted on the first air block 5 so that the inner cavity of the airtight cannula 7 is connected to the first air cavity 51, and the other end of the airtight cannula 7 can be movably inserted on the second air block 6 so that the inner cavity of the airtight cannula 7 is connected to the second air cavity 61.

[0096] Optionally, the first gas block 5 has a first opening connected to the first air cavity 51, one end of the airtight cannula 7 is inserted into the first opening, and the airtight cannula 7 can move relative to the first gas block 5 along its own length direction, that is, the depth of the airtight cannula 7 inserted into the first opening is adjustable.

[0097] Optionally, the second gas block 6 has a second opening connected to the second air cavity 61, the other end of the airtight cannula 7 is inserted into the second opening, and the airtight cannula 7 can move relative to the second gas block 6 along its own length direction, that is, the depth of the airtight cannula 7 inserted into the second opening can also be adjusted.

[0098] In this way, when the mobile driving member 3 drives the clamping driving member 4 to move and the distance between the two becomes smaller, the airtight cannula 7 will not bend, and the excess length of the airtight cannula 7 will extend into the first air block 5 or the second air block 6. The airtight cannula 7 always remains straight, which can solve the problem of deviation in the driving stroke of the cylinder caused by the change of steric resistance in the trachea due to the bending of the trachea, and further eliminate the factors that will reduce the accuracy of the sampling system.

[0099] like Figure 6 As shown, optionally, the high-precision sample injection system 100 further includes a sample transfer component, which includes a sample transfer tube 8, and the sample transfer tube 8 is used to exchange samples with the clamping component.

[0100] Optionally, the sample transfer assembly further includes a sample transfer driver 9 configured to drive the sample transfer tube 8 in a forward direction to exchange samples with the gripping assembly. Optionally, the sample transfer driver 9 is configured to drive the sample transfer tube 8 in a second direction, wherein the first direction and the second direction are non-parallel. In this embodiment, the first direction is vertical, the second direction is horizontal, and when the sample transfer tube 8 and the clamping assembly 2 are at the same height, the direction in which the sample transfer driver 9 drives the sample transfer tube 8 to move is aligned with a line connecting the first clamping position 21 and the second clamping position 22 of the clamping assembly 2.

[0101] Optionally, the sample transfer drive 9 is a pneumatic cylinder, which also has two precise positioning points, corresponding to the two ends of the driving stroke of the sample transfer drive 9. The sample transfer tube 8 has only one position for storing the sample tube 900, and the sample transfer tube 8 needs to stop at the end close to the clamping assembly 2 and the end away from the clamping assembly 2 and close to the sample port. However, when the sample transfer tube 8 and the clamping assembly 2 are docked, they need to be able to correspond to the two clamping positions of the clamping assembly 2 respectively to obtain the sample tube 900 at any clamping position. Therefore, the sample transfer tube 8 needs a total of three precise stopping positions, but the sample transfer drive 9 only provides two precise positioning points.

[0102] In order to add a precise positioning point, the sample transfer assembly of this embodiment also includes a hook assembly, which can prevent the sample transfer drive 9 from driving the sample transfer tube 8 to move or the hook assembly can push the sample transfer tube 8 to move in the opposite direction. The driving force of the hook assembly is greater than the driving force of the sample transfer drive 9, so that the sample transfer tube 8 can correspond to any clamping position.

[0103] like Figure 8 As shown, Figure 8In the upper part of the figure, the sample transfer drive member 9 has reached one end of the drive stroke, and the sample transfer tube 8 is located at the position closest to the rotating sample disk 1. At this time, the sample transfer tube 8 is just below the second clamping position 22. The clamping jaw assembly 2 is released, and the sample tube 900 at the second clamping position 22 can fall into the sample transfer tube 8, or the clamping jaw assembly 2 can clamp the sample tube 900 in the sample transfer tube 8. Figure 8 The hook assembly in the lower half of the figure pushes the sample tube 8 to move in the opposite direction, that is, to move a distance in the direction away from the rotating sample disk 1, so that the sample tube 8 is just below the first clamping position 21. The clamping jaw assembly 2 is released, and the sample tube 900 at the first clamping position 21 can fall into the sample tube 8, or the clamping jaw assembly 2 can clamp the sample tube 900 in the sample tube 8.

[0104] Alternatively, as Figure 7 As shown, the blocking hook assembly includes a blocking hook driving member 10 and a blocking hook member 11 . The blocking hook driving member 10 is used to drive the blocking hook member 11 , and the blocking hook member 11 is used to block or push the sample transfer tube 8 .

[0105] Optionally, the direction in which the hook driver 10 drives the hook member 11 to move is aligned with the direction in which the sample transfer driver 9 drives the sample transfer tube 8 to move. By debugging, the hook driver 10 and the sample transfer driver 9 can have appropriate respective driving forces and driving force differences to ensure positioning accuracy.

[0106] Optionally, the hook drive 10 is also a cylinder. Optionally, when the hook drive 10 reaches one end of the driving stroke, the sample tube 8 corresponds to one clamping position, and when the hook drive 10 reaches the other end of the driving stroke, the sample tube 8 corresponds to another clamping position. In this embodiment, when the hook drive 10 is fully retracted, even if the sample tube 8 is located at the position closest to the rotating sample disk 1, the hook 11 does not abut the sample tube 8, and the state of the sample tube 8 is as follows. Figure 8 In the upper part of the figure, the sample transfer tube 8 corresponds to the second clamping position 22. When the stop hook driving member 10 is fully extended, the stop hook member 11 pushes the sample transfer tube 8 to move to Figure 8 The position in the lower half of the figure, that is, the sample transfer tube 8 corresponds to the first clamping position 21.

[0107] Optionally, the distance between the two clamping positions is d1, the driving stroke of the movable driver 3 is d2, and the driving stroke of the blocking driver 10 is d2-d1. That is, when the blocking driver 10 is fully retracted, the blocking driver 11 just does not abut the sample transfer tube 8.

[0108] The first driving member 12 is a vertical cylinder, and the sample transfer driving member 9 is a horizontal cylinder. The two are arranged crosswise. In order to prevent interference between the clamping jaw assembly 2 and the sample transfer tube 8, in this embodiment, when the clamping jaw assembly 2 is located at the first cross position and the sample transfer tube 8 is located at the second cross position, interference will occur between the clamping jaw assembly 2 and the sample transfer tube 8.

[0109] Therefore, the high-precision sample feeding system 100 may optionally further include a first detection member (not shown) configured to detect whether the clamping jaw assembly 2 is located at the first intersection position, thereby enabling the clamping jaw assembly 2 to prevent the sample transfer tube 8 from moving in the second direction. Specifically, when the first detection member detects that the clamping jaw assembly 2 is located at the first intersection position, the first detection member transmits a signal to the controller, which in turn controls the sample transfer driver 9 to prevent the sample transfer tube 8 from being transferred to the second intersection position.

[0110] Optionally, the high-precision sample feeding system 100 further includes a second detection member (not shown) configured to detect whether the sample tube 8 is located at the second intersection position, thereby enabling the sample tube 8 to avoid movement of the clamping assembly 2 in the first direction. Specifically, when the second detection member detects that the sample tube 8 is located at the second intersection position, the second detection member transmits a signal to the controller, which in turn controls the first driving member 12 to prevent the clamping assembly 2 from moving to the first intersection position. It should be noted that the first intersection position and the second intersection position correspond to two separate regions.

[0111] By providing four circles of sample storage wells 1011 on the rotating sample disk 1, the high-precision sample injection system 100 can reduce the outer diameter of the rotating sample disk 1 while maintaining the total number of sample storage wells 1011 unchanged, thereby improving the rotational accuracy of the rotating sample disk 1. Furthermore, by providing a clamping jaw assembly 2 with two clamping positions in conjunction with a movable drive 3 having two precisely positioned members, the high-precision sample injection system 100 achieves precise alignment of the sample tubes 900 within the four circles of sample storage wells 1011, thereby enabling precise sample exchange between the rotating sample disk 1 and the clamping jaw assembly 2. Furthermore, to coordinate with the structure of the clamping assembly so that both clamping positions can precisely align with the sample transfer tube 8, the high-precision sample injection system 100 is also equipped with a retaining hook assembly. The retaining hook assembly, in conjunction with the sample transfer drive 9, allows the sample transfer tube 8 to have two precise positioning points near one end of the clamping assembly, corresponding to the two clamping positions of the clamping assembly, thereby achieving precise sample exchange from the clamping jaw assembly 2 to the sample transfer tube 8. It can be seen that the high-precision sample injection system 100 improves the accuracy of the sample exchange position in all aspects, so that the final sample injection can meet the requirements of the nuclear magnetic resonance equipment.

[0112] This embodiment also provides a nuclear magnetic resonance device, including the above-mentioned high-precision sample feeding system 100. The nuclear magnetic resonance device also includes a superconducting magnet system 200, and the top of the superconducting magnet system 200 has a sample port, through which the sample tube 900 enters and exits. Optionally, in this embodiment, the sample transfer drive 9 drives the sample transfer tube 8 back and forth between the sample port and the position where it is docked with the clamping jaw assembly 2. The sample transfer tube 8 can obtain the tested sample tube 900 output from the sample port and can also insert a new sample tube 900 into the sample port.

[0113] By providing four circles of sample storage holes 1011 on the rotating sample disk 1, the high-precision sample injection system 100 of the nuclear magnetic resonance device can reduce the outer diameter of the rotating sample disk 1 while maintaining the total number of sample storage holes 1011 unchanged, thereby improving the rotation accuracy of the rotating sample disk 1. Furthermore, by providing a clamping jaw assembly 2 with two clamping positions in conjunction with a movable drive 3 having two precisely positioned positions, the high-precision sample injection system 100 achieves precise alignment of the sample tubes 900 within the four circles of sample storage holes 1011, thereby enabling precise sample exchange between the rotating sample disk 1 and the clamping jaw assembly 2. Furthermore, to coordinate with the structure of the clamping assembly so that both clamping positions can precisely align with the sample transfer tube 8, the high-precision sample injection system 100 is also equipped with a retaining hook assembly. The retaining hook assembly, in conjunction with the sample transfer drive 9, provides the sample transfer tube 8 with two precise positioning points near one end of the clamping assembly, corresponding to the two clamping positions of the clamping assembly, thereby achieving precise sample exchange from the clamping jaw assembly 2 to the sample transfer tube 8. It can be seen that the high-precision sample feeding system 100 of the nuclear magnetic resonance device improves the accuracy of the sample changing position in all aspects and can meet the high-precision requirements.

[0114] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. High-precision sample injection system, characterized by: include: A rotating sample disk (1), wherein M circles of sample storage holes (1011) are provided on the rotating sample disk (1), each circle of the sample storage holes (1011) comprises a plurality of the sample storage holes (1011) sequentially arranged at intervals along a circumferential direction around the rotation center of the rotating sample disk (1), M being a positive integer greater than 1, and the sample storage holes (1011) being used to store sample tubes (900); A gripping assembly, comprising a gripping jaw assembly (2), wherein the gripping jaw assembly (2) is capable of gripping or releasing the sample tube (900), so that the gripping jaw assembly (2) can exchange samples with the rotating sample disk (1); The clamping jaw assembly (2) has N clamping positions, and the N clamping positions can respectively align with different circles of the sample storage holes (1011), N is a positive integer greater than 1, and / or the clamping assembly includes a moving drive member (3), and the moving drive member (3) can drive the clamping jaw assembly (2) to move so that the clamping positions are aligned with different circles of the sample storage holes (1011).

2. The high-precision sample injection system according to claim 1, characterized in that: The clamping jaw assembly (2) has two clamping positions, and a connecting line of the two clamping positions projected toward the rotating sample disk (1) coincides with a radial direction of the rotating sample disk (1).

3. The high-precision sample injection system according to claim 2, characterized in that: Along the radial direction of the rotating sample disk (1), the distance between at least two adjacent circles of the sample storage holes (1011) is d0, and the distance between two clamping positions is d1, where d1=d0.

4. The high-precision sample injection system according to claim 1, characterized in that: The clamping jaw assembly (2) is capable of moving along a first direction, which is perpendicular to the disk surface of the rotating sample disk (1).

5. The high-precision sample injection system according to claim 1, characterized in that: The clamping jaw assembly (2) comprises two clamping jaw members, and the distance between any two adjacent sample storage holes (1011) is greater than the maximum distance between the two clamping jaw members.

6. The high-precision sample injection system according to any one of claims 1 to 5, characterized in that: The sample storage holes (1011) on the rotating sample disk (1) include a first circle (101), a second circle (102), a third circle (103) and a fourth circle (104) arranged in sequence, the clamping claw assembly (2) has two clamping positions, and the clamping assembly includes the mobile driving member (3), the mobile driving member (3) can drive the two clamping positions to correspond to the sample storage holes (1011) on the first circle (101) and the sample storage holes (1011) on the second circle (102), respectively, and the mobile driving member (3) can also drive the two clamping positions to correspond to the sample storage holes (1011) on the third circle (103) and the sample storage holes (1011) on the fourth circle (104), respectively.

7. The high-precision sample injection system according to claim 6, characterized in that: The first trajectory of the movement of the clamping assembly (2) driven by the mobile driving member (3) is parallel to the disk surface of the rotating sample disk (1), and the first trajectory coincides with the radial direction of the rotating sample disk (1). The driving stroke of the mobile driving member (3) is d2. Along the radial direction of the rotating sample disk (1), the distance between the first circle (101) and the third circle (103) is d3, and d3=d2. And / or, the distance between the second circle (102) and the fourth circle (104) is d4, d4=d2.

8. The high-precision sample injection system according to claim 6, characterized in that: The sample storage holes (1011) of the first circle (101) are shifted along the radial direction of the rotating sample disk (1) to the first virtual holes on the second circle (102), and there is no overlap between the first virtual holes and any sample storage holes (1011) on the second circle (102); and / or, the sample storage holes (1011) of the second circle (102) are shifted along the radial direction of the rotating sample disk (1) to the second virtual holes on the first circle (101) without any overlap with any of the sample storage holes (1011) on the first circle (101); and / or, the sample storage holes (1011) of the third circle (103) are shifted along the radial direction of the rotating sample disk (1) to the third virtual holes on the fourth circle (104) and do not overlap with any of the sample storage holes (1011) on the fourth circle (104); And / or, the sample storage holes (1011) of the fourth circle (104) are shifted radially along the rotating sample disk (1) to the fourth virtual holes on the third circle (103) and do not overlap with any of the sample storage holes (1011) on the third circle (103).

9. The high-precision sample injection system according to claim 8, characterized in that: The first virtual hole is located in the middle of the sample storage holes (1011) on two adjacent second circles (102); And / or, the second virtual hole is located in the middle of the sample storage holes (1011) on two adjacent first circles (101); And / or, the third virtual hole is located in the middle of the sample storage holes (1011) on two adjacent fourth circles (104); And / or, the fourth virtual hole is located in the middle of the sample storage holes (1011) on two adjacent third circles (103).

10. The high-precision sample injection system according to claim 6, characterized in that: The clamping assembly further includes a clamping drive (4), which is used to drive the clamping jaw assembly (2) to clamp or release the sample tube (900), and the clamping drive (4) is connected to the output end of the moving drive (3).

11. The high-precision sample injection system according to claim 10, characterized in that: The clamping drive (4) is a gas cylinder, and the clamping assembly further comprises a first gas block (5), the first gas block (5) is connected to the housing of the clamping drive (4), and a first gas cavity (51) in the first gas block (5) is connected to the gas inlet of the clamping drive (4); And / or, the movable driving member (3) is a cylinder, and the clamping assembly further includes a second gas block (6), the second gas block (6) is connected to the housing of the movable driving member (3), and the second gas cavity (61) in the second gas block (6) is connected to the gas inlet of the movable driving member (3).

12. The high-precision sample injection system according to claim 11, characterized in that: The clamping assembly also includes an airtight cannula (7), one end of which is movably inserted on the first air block (5) so that the inner cavity of the airtight cannula (7) is connected to the first air cavity (51), and the other end of which is movably inserted on the second air block (6) so that the inner cavity of the airtight cannula (7) is connected to the second air cavity (61).

13. The high-precision sample injection system according to claim 6, characterized in that: It also includes a sample transfer component, which includes a sample transfer tube (8). The sample transfer tube (8) is used to exchange samples with the clamping component.

14. The high-precision sample injection system according to claim 13, characterized in that: The sample transfer assembly further comprises a sample transfer drive (9) and a stop hook assembly, wherein the sample transfer drive (9) is used to drive the sample transfer tube (8) to move forward to exchange samples with the clamping assembly, and the stop hook assembly can prevent the sample transfer drive (9) from driving the sample transfer tube (8) to move or the stop hook assembly can push the sample transfer tube (8) to move in the reverse direction, and the driving force of the stop hook assembly is greater than the driving force of the sample transfer drive (9), so that the sample transfer tube (8) can correspond to any one of the clamping positions.

15. The high-precision sample injection system according to claim 14, characterized in that: The blocking hook assembly comprises a blocking hook driving member (10) and a blocking hook member (11), wherein the blocking hook driving member (10) is used to drive the blocking hook member (11), and the blocking hook member (11) is used to block or push the sample transfer tube (8).

16. The high-precision sample injection system according to claim 15, characterized in that: The direction in which the blocking hook driving member (10) drives the blocking hook member (11) to move is in a straight line with the direction in which the sample transfer driving member (9) drives the sample transfer tube (8) to move.

17. The high-precision sample injection system according to claim 16, characterized in that: When the blocking hook driving member (10) is driven to one end of the driving stroke, the sample transfer tube (8) corresponds to one clamping position; when the blocking hook driving member (10) is driven to the other end of the driving stroke, the sample transfer tube (8) corresponds to another clamping position; And / or, the distance between the two clamping positions is d1, the driving stroke of the movable driving member (3) is d2, and the driving stroke of the hook driving member (10) is d2-d1.

18. The high-precision sample injection system according to claim 14, characterized in that: The clamping assembly further comprises a first driving member (12), the first driving member (12) being used to drive the clamping jaw assembly (2) to move along a first direction, and the sample transfer driving member (9) being used to drive the sample transfer tube (8) to move along a second direction, wherein the first direction is not parallel to the second direction.

19. The high-precision sample injection system according to claim 18, characterized in that: It also includes a first detection member, which is used to detect whether the clamping jaw assembly (2) is located at a first intersection position, so that the clamping jaw assembly (2) can avoid the movement of the sample transfer tube (8) along the second direction; And / or, it further comprises a second detection member, the second detection member being used to detect whether the sample transfer tube (8) is located at a second intersection position, so that the sample transfer tube (8) can avoid the movement of the clamping jaw assembly (2) along the first direction.

20. Nuclear magnetic resonance equipment, characterized in that Comprising the high-precision sample injection system as described in any one of claims 1-19.

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