A detection device for calibrating magnetic variables of a nuclear magnetic resonance instrument

Abstract

The application belongs to the technical field of magnetic variable detection, and particularly relates to a detection device for calibrating magnetic variables of a nuclear magnetic resonance instrument, which comprises a probe and a connecting frame. A cable is connected to the probe and used for connecting a detection host. A sliding groove is formed in the top end of the connecting frame. A sliding block is slidably connected to the inner wall of the sliding groove. A connecting rod is fixedly connected to the top surface of the sliding block. A positioning assembly for positioning the probe is arranged on the connecting rod. The probe is placed on the positioning assembly, then the cable is connected to the host, and then the connecting frame is placed on the bed body of the nuclear magnetic resonance instrument. Then the bed body is controlled to move, and the probe enters the magnet cavity. During the detection process, the connecting lines on the left and right sides are pulled to control the left and right movements of the sliding block, so that the position of the probe on the sliding block changes, and the magnet cavity is detected from multiple directions, the accuracy of the obtained data is improved, and errors in calibration are avoided.

Description

Technical Field

[0001] This invention belongs to the field of magnetic variable detection technology, specifically a detection device for calibrating magnetic variables in a nuclear magnetic resonance spectrometer. Background Technology

[0002] Magnetic resonance imaging (MRI) is a core piece of equipment in the field of medical imaging. It uses the combined action of a main magnetic field (BO) and a radio frequency field to perform high-resolution imaging of human soft tissues and organs. It is widely used in disease diagnosis and scientific research. Its imaging accuracy directly depends on the strength accuracy, spatial uniformity, and long-term stability of the main magnetic field. If magnetic variables (field strength deviation, uniformity drift, etc.) exceed the allowable range, it will lead to image distortion and diagnostic errors. Therefore, it is necessary to regularly perform precise calibration and testing of the magnetic variables of the MRI machine.

[0003] The mainstream detection device at present is the nuclear magnetic resonance magnetometer (NMR teslameter). This device is based on the Larmor precession principle of the atomic nucleus, traces back to the SI unit, and has a capacity of 10... ⁻6 ~10 ⁻7 The high-precision measurement is the "gold standard" for magnetic variable calibration. It adopts a split structure, consisting of a non-magnetic non-metallic probe, a measurement and control host, connecting cables and a bracket. It can be inserted into the magnet cavity and achieves efficient detection of parameters such as field strength and uniformity through resonance frequency conversion, providing reliable technical support for the magnetic variable calibration of nuclear magnetic resonance spectrometers.

[0004] In the magnetic variable calibration process of nuclear magnetic resonance (NMR) spectrometers, the detection probe is usually placed on the equipment bed, and the probe is driven into the magnet cavity by the feed motion of the bed to perform the detection. However, the existing method can only realize the probe's axial movement with the bed, and it is difficult to adjust the position in the left-right and up-down directions within the magnet cavity. It is impossible to complete the acquisition of magnetic field parameters from multiple points and in all directions, resulting in incomplete and inaccurate detection of key magnetic variables such as magnetic field uniformity and field strength distribution, which in turn affects the calibration effect and detection accuracy. To address this, the present invention provides a detection device for NMR spectrometer magnetic variable calibration. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a detection device for magnetic variable calibration of a nuclear magnetic resonance spectrometer, comprising a probe and a connecting frame. A cable is connected to the probe for connecting to a detection host. A sliding groove is provided at the top of the connecting frame, and a slider is slidably connected to the inner wall of the sliding groove. A connecting rod is fixedly connected to the top surface of the slider, and a positioning component for positioning the probe is provided on the connecting rod. Grooves are provided on both sides of the connecting frame, and guide wheels are rotatably connected to the inner wall of the grooves. A connecting line is provided on the guide wheel, and one end of the connecting line is connected to the side wall of the slider.

[0007] Preferably, the end of the connecting line away from the slider is fixedly connected to a rotating shaft, the bottom surface of the rotating shaft is rotatably connected to a hollow block, the top surface of the hollow block is provided with a guide groove, a motor is slidably connected to the guide groove, the top surface of the rotating shaft is fixedly connected to a first gear, the output end of the motor is fixedly connected to a second gear that meshes with the first gear, and the connecting line passes through the side wall of the hollow block.

[0008] Preferably, the top surface of the hollow block is provided with a pair of slots, and the outer side wall of the motor is fixedly connected with a pair of connecting blocks, and the connecting blocks are slidably connected with a locking block that engages with the slot.

[0009] Preferably, the top end of the connecting rod is open, an adjusting rod is slidably connected inside the connecting rod, the positioning component is disposed above the adjusting rod, and a moving component for controlling the movement of the adjusting rod is disposed on the connecting frame.

[0010] Preferably, a hollow elastic block is fixedly connected to the inner wall of the chute, an air inlet pipe and an air outlet pipe are connected inside the connecting rod, a connecting pipe is connected inside the elastic block, the end of the connecting pipe away from the elastic block is connected to the air inlet pipe, a conduit is connected inside the elastic block, a sealing cap is threaded to the top of the conduit, and a sealing element is provided inside both the air outlet pipe and the air inlet pipe.

[0011] Preferably, the sealing element includes a pair of elastic ropes fixed inside the air outlet pipe and the air inlet pipe, a sealing ball is provided inside the air outlet pipe and the air inlet pipe, the sealing ball is fixedly connected to the elastic ropes, the ends of the air outlet pipe and the air inlet pipe that are close to each other are tapered, and a push rod is fixedly connected to the bottom surface of the inner wall of the slide groove, the push rod can extend into the air outlet pipe.

[0012] Preferably, the positioning component includes a fixing ring fixed to the top of the adjusting rod, and an elastic ring is fixedly connected to the inner wall of the fixing ring.

[0013] Preferably, the elastic ring has a hollow structure inside, the adjusting rod has a first connecting groove, the fixing ring has a second connecting groove communicating with the first connecting groove, and the outer wall of the elastic ring has a third connecting groove communicating with the second connecting groove.

[0014] Preferably, a set of cylinders is fixedly connected to the bottom surface of the connecting frame, and a suction cup is fixedly connected to the bottom end of the cylinders.

[0015] Preferably, the cylinder has an opening at its bottom end, a through groove at its top end that communicates with the slide groove, a push plate that is slidably connected to the inner wall of the cylinder, a spring that is fixedly connected between the top end of the push plate and the inner wall of the cylinder, a ball that is rotatably connected inside the cylinder, and the ball is driven to rotate when the slider passes by the ball, and a limiting plate that limits the push plate is fixedly connected to the surface of the ball.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention places the probe on the positioning assembly, connects the cable to the main unit, places the connecting frame on the bed of the MRI machine, and then controls the bed to move so that the probe enters the magnet cavity. During the detection process, the slider can be moved left and right by pulling the connecting cables on the left and right sides, thereby changing the position of the probe on the slider. This allows for multi-directional detection of the magnet cavity, improving the accuracy of data acquisition and avoiding calibration errors.

[0018] 2. This invention uses a sliding motor to engage the second gear with the first gear on the left or right. Then, the motor is started to control the rotation of the second gear. At this time, the first gear will drive the rotating shaft to rotate. The connecting wire will be wound around the rotating shaft, thereby pulling the slider to move. The second gear can automatically control the slider to move left and right through the motor, and can better control the movement distance, so that the probe stops at the desired position, improving the convenience of detection. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the connecting frame in this invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the connecting frame in this invention;

[0022] Figure 3 yes Figure 2 Enlarged view of point A;

[0023] Figure 4 yes Figure 2 Partial structural diagram

[0024] Figure 5 yes Figure 4 Enlarged view of point B;

[0025] Figure 6 This is a schematic diagram of the hollow block structure in this invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the hollow block in this invention;

[0027] Figure 8 This is a partial structural cross-sectional view of the connecting frame in this invention;

[0028] Figure 9 This is a schematic diagram of the internal structure of the suction cup and cylinder in this invention.

[0029] In the diagram: 1. Probe; 2. Cable; 3. Connecting frame; 4. Slide groove; 5. Slider; 6. Connecting rod; 7. Connecting wire; 8. Groove; 9. Guide wheel; 10. Hollow block; 11. Rotating shaft; 12. First gear; 13. Second gear; 14. Motor; 15. Connecting block; 16. Locking block; 17. Locking groove; 18. Adjusting rod; 19. Air outlet pipe; 20. Air inlet pipe; 21. Elastic rope; 22. Sealing ball; 23. Connecting pipe; 24. Push rod; 25. Elastic block; 26. Guide tube; 27. Elastic ring; 28. Fixing ring; 29. ​​First connecting groove; 30. Second connecting groove; 31. Third connecting groove; 32. Suction cup; 33. Cylinder; 34. Limiting plate; 35. Push plate; 36. Ball; 37. Through groove. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example 1: As Figures 1 to 7 As shown in the embodiment of the present invention, a detection device for calibrating magnetic variables of a nuclear magnetic resonance spectrometer includes a probe 1 and a connecting frame 3. A cable 2 is connected to the probe 1 for connecting to a detection host. A groove 4 is provided at the top of the connecting frame 3, and a slider 5 is slidably connected to the inner wall of the groove 4. A connecting rod 6 is fixedly connected to the top surface of the slider 5, and a positioning component for positioning the probe 1 is provided on the connecting rod 6. Grooves 8 are provided on both sides of the connecting frame 3, and guide wheels 9 are rotatably connected to the inner wall of the grooves 8. A connecting line 7 is provided on the guide wheel 9, and one end of the connecting line 7 is connected to the side wall of the slider 5.

[0032] When calibrating and testing the magnetic variables of an NMR spectrometer, this application places probe 1 on a positioning assembly located on a connecting frame 3. Cable 2 is then connected to the main unit, and the connecting frame 3 is placed on the NMR spectrometer's bed. The bed is then moved to allow probe 1 to enter the magnet cavity, where magnetic variables are detected. Parameters such as field strength and uniformity are efficiently detected through resonance frequency conversion. During the testing process, the slider 5 can be moved left and right by pulling the connecting cables 7 on both sides, thus changing the position of probe 1 on the slider 5. This allows for multi-directional testing of the magnet cavity, improving the accuracy of data acquisition and avoiding calibration errors.

[0033] The end of the connecting line 7 away from the slider 5 is fixedly connected to a rotating shaft 11. A hollow block 10 is rotatably connected to the bottom surface of the rotating shaft 11. A guide groove is opened on the top surface of the hollow block 10. A motor 14 is slidably connected to the guide groove. A first gear 12 is fixedly connected to the top surface of the rotating shaft 11. A second gear 13 that meshes with the first gear 12 is fixedly connected to the output end of the motor 14. The connecting line 7 passes through the hollow side wall.

[0034] Except for the motor 14, all parts used in this application are made of non-magnetic materials. When the connecting frame 3 is placed on the bed, the hollow block 10 needs to be set away from the bed. Then, when it is necessary to control the probe 1 to move left or right, the motor 14 can be slid to make the second gear 13 mesh with the first gear 12 on the left or right. Then, the motor 14 is started to control the second gear 13 to rotate. At this time, the first gear 12 will drive the rotating shaft 11 to rotate. At this time, the connecting wire 7 will be wound on the rotating shaft 11, thereby pulling the slider 5 to move. The second gear 13 can automatically control the slider 5 to move left or right through the motor 14, and can better control the movement distance, so that the probe 1 stops at the desired position, improving the convenience of detection.

[0035] The top surface of the hollow block 10 is provided with a pair of slots 17, and the outer side wall of the motor 14 is fixedly connected with a pair of connecting blocks 15. The connecting blocks 15 are slidably connected with a locking block 16 that engages with the slots 17. When the first gear 12 and the second gear 13 in this application are meshed, the locking block 16 will be located just above the slots 17. At this time, the locking block 16 can be pushed to engage with the slots 17, thereby limiting the motor 14 and preventing the second gear 13 from disengaging from the first gear 12 when the motor 14 is working again.

[0036] The top end of the connecting rod 6 is open, and an adjusting rod 18 is slidably connected inside the connecting rod 6. The positioning component is located above the adjusting rod 18, and the connecting frame 3 is provided with a moving component to control the movement of the adjusting rod 18. When the probe 1 needs to move within the magnet cavity, the moving component can be used to control the adjusting rod 18 to move upward. At this time, the height of the probe 1 above the adjusting rod 18 can be adjusted to further improve multi-point and all-round detection, thereby improving the calibration effect and detection accuracy.

[0037] A hollow elastic block 25 is fixedly connected to the inner wall of the slide 4. An air inlet pipe 20 and an air outlet pipe 19 are connected inside the connecting rod 6. A connecting pipe 23 is connected inside the elastic block 25. The end of the connecting pipe 23 away from the elastic block 25 is connected to the air inlet pipe 20. A conduit 26 is connected inside the elastic block 25. A sealing cap is threaded to the top of the conduit 26. Both the air outlet pipe 19 and the air inlet pipe 20 are provided with sealing elements.

[0038] When the adjusting rod 18 needs to move upward, the slider 5 can be moved to compress the elastic block 25. At this time, the gas in the elastic block 25 will enter the air inlet pipe 20 from the connecting pipe 23, and then enter the connecting rod 6 to push the adjusting rod 18 upward, so that the probe 1 above the adjusting rod 18 can move upward. After moving to the appropriate position, the seal will seal the air inlet pipe 20. At this time, the connecting rod 6 is in a sealed state, and the adjusting rod 18 is in a fixed state and will not move anymore, so that the probe 1 is maintained at the adjusted height. When the adjusting rod 18 needs to move downward, the seal in the air outlet pipe 19 will no longer seal the air outlet pipe 19. At this time, the adjusting rod 18 will slide downward due to gravity. After moving to the appropriate position, the seal will seal the air outlet pipe 19. After the test is completed, the sealing cover can be rotated to allow the elastic block 25 to enter air from the conduit 26 so that the elastic block 25 can return to its original state.

[0039] The sealing element includes a pair of elastic ropes 21 fixed inside the air outlet pipe 19 and the air inlet pipe 20. A sealing ball 22 is provided inside the air outlet pipe 19 and the air inlet pipe 20. The sealing ball 22 is fixedly connected to the elastic ropes 21. The ends of the air outlet pipe 19 and the air inlet pipe 20 that are close to each other are tapered. A push rod 24 is fixedly connected to the bottom surface of the inner wall of the slide groove 4. The push rod 24 can extend into the air outlet pipe 19.

[0040] In this application, when the gas in the elastic block 25 enters the intake pipe 20, the gas pushes the sealing ball 22 inside the intake pipe 20, causing the sealing ball 22 to no longer seal the intake pipe 20. At this time, the gas can enter the connecting rod 6 and push the adjusting rod 18 to move upward. When the intake stops, the elastic rope 21 will pull the sealing ball 22 to seal the intake pipe 20. When the adjusting rod 18 needs to move downward, the slider 5 can be controlled to move closer to the push rod 24. At this time, the push rod 24 can enter the exhaust pipe 19 and push the sealing ball 22. At this time, the adjusting rod 18 will move downward, so that the gas in the connecting rod 6 can be discharged from the exhaust pipe 19. After the adjusting rod 18 moves to the appropriate position, it moves away from the push rod 24. At this time, the elastic rope 21 will pull the sealing ball 22 to seal the inside of the exhaust pipe 19.

[0041] The positioning component includes a fixing ring 28 fixed to the top of the adjusting rod 18, and an elastic ring 27 is fixedly connected to the inner wall of the fixing ring 28. The probe 1 in this application can be placed at the center of the fixing ring 28, at which time the elastic ring 27 can apply pressure to the probe 1 to fix the probe 1.

[0042] The elastic ring 27 has a hollow internal structure. The adjusting rod 18 has a first connecting groove 29. The fixing ring 28 has a second connecting groove 30 that communicates with the first connecting groove 29. The outer wall of the elastic ring 27 has a third connecting groove 31 that communicates with the second connecting groove 30. When performing magnetic variable calibration testing, different types of probes 1 are used. In order to adapt to different probes 1, when the probe 1 is placed in the fixing ring 28, the elastic block 25 can be manually pressed to allow gas to enter the connecting rod 6. At this time, the gas will enter the elastic ring 27 along the first connecting groove 29, the second connecting groove 30 and the third groove, thereby causing the elastic ring 27 to expand and squeeze the probe 1 to fix different types of probes 1.

[0043] Example 2: Figures 8 to 9 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a set of cylinders 33 are fixedly connected to the bottom surface of the connecting frame 3, and a suction cup 32 is fixedly connected to the bottom end of the cylinders 33; after the connecting frame 3 is placed on the bed, it needs to be driven by the motor 14 to pull the slider 5 to move. In order to prevent the connecting frame 3 from shifting during the pulling process, it can be attached to the bed by the suction cup 32, thereby fixing the connecting frame 3 to the bed to improve the stability during subsequent testing.

[0044] The cylinder 33 has an opening at its bottom end and a through groove 37 at its top end that communicates with the sliding groove 4. A push plate 35 is slidably connected to the inner wall of the cylinder 33. A spring is fixedly connected between the top end of the push plate 35 and the inner wall of the cylinder 33. A ball 36 is rotatably connected inside the cylinder 33. When the slider 5 passes through the ball 36, the ball 36 is driven to rotate. A limiting plate 34 is fixedly connected to the surface of the ball 36 to limit the push plate 35. After the suction cup 32 is attached to the bed, it can drive the slider 5 to rotate, allowing the slider 5 to pass through the ball 36. At this time, the ball 36 will rotate, causing the limiting plate 34 to rotate and tilt. Then, the spring will pull the push plate 35, thereby allowing the push plate 35 to draw the gas in the suction cup 32, allowing the suction cup 32 to further adhere to the bed to improve stability.

[0045] Working principle: The probe 1 is placed on the positioning component, which is located on the connecting frame 3. Then, the cable 2 is connected to the main unit, and the connecting frame 3 is placed on the bed of the MRI machine. The bed is then moved to allow the probe 1 to enter the magnet cavity. Magnetic variables are then detected. Through resonance frequency conversion, parameters such as field strength and uniformity are efficiently detected. During the detection process, the slider 5 can be moved left and right by pulling the connecting lines 7 on both sides, thereby changing the position of the probe 1 on the slider 5. This allows for multi-directional detection of the magnet cavity, improving the accuracy of data acquisition and avoiding calibration errors.

[0046] Except for the motor 14, all parts used in this application are made of non-magnetic materials. When the connecting frame 3 is placed on the bed, the hollow block 10 needs to be set away from the bed. Then, when it is necessary to control the probe 1 to move left and right, the motor 14 can be slid to make the second gear 13 mesh with the first gear 12 on the left or right. Then, the motor 14 is started to control the second gear 13 to rotate. At this time, the first gear 12 will drive the rotating shaft 11 to rotate. At this time, the connecting wire 7 will be wound on the rotating shaft 11, thereby pulling the slider 5 to move. The second gear 13 can automatically control the slider 5 to move left and right through the motor 14, and can better control the movement distance, so that the probe 1 stops at the desired position, improving the convenience of detection. When the first gear 12 and the second gear 13 mesh in this application, the locking block 16 will be located above the locking slot 17. At this time, the locking block 16 can be pushed to engage with the locking slot 17, thereby limiting the motor 14 and preventing the second gear 13 from disengaging from the first gear 12 when the motor 14 is working.

[0047] When the probe 1 needs to move within the magnet cavity, the adjusting rod 18 can be moved upwards using a moving component. This allows adjustment of the probe 1's position above the adjusting rod 18, further enhancing multi-point and omnidirectional detection, thereby improving calibration and detection accuracy. When the adjusting rod 18 needs to move upwards, the slider 5 can be moved to compress the elastic block 25. Gas from the elastic block 25 enters the inlet pipe 20 through the connecting pipe 23, then enters the connecting rod 6, pushing the adjusting rod 18 upwards. This allows the probe 1 above the adjusting rod 18 to move upwards. After reaching the appropriate position, the seal seals the inlet pipe 20, creating a sealed state within the connecting rod 6. The adjusting rod 18 remains fixed and will not move further, maintaining the probe 1 at the adjusted height. When the adjusting rod 18 needs to move downwards, the seal in the outlet pipe 19 is removed, causing the adjusting rod 18 to slide downwards due to gravity. After moving to the appropriate position, the seal will seal the outlet pipe 19. After the test is completed, the sealing cover can be rotated to allow air to enter the elastic block 25 through the conduit 26, so that the elastic block 25 can return to its original position. In this application, when the gas in the elastic block 25 enters the inlet pipe 20, the gas will push the sealing ball 22 in the inlet pipe 20, so that the sealing ball 22 no longer seals the inlet pipe 20. At this time, the gas can enter the connecting rod 6 and push the adjusting rod 18 to move upward. When the air intake stops, the elastic rope 2 1. The sealing ball 22 will be pulled to seal the air inlet pipe 20. When the adjusting rod 18 needs to move downward, the slider 5 can be controlled to move closer to the push rod 24. At this time, the push rod 24 can enter the air outlet pipe 19 and push the sealing ball 22. Then the adjusting rod 18 will move downward, so that the gas in the connecting rod 6 can be discharged from the air outlet pipe 19. After the adjusting rod 18 moves to the appropriate position, it moves away from the push rod 24. At this time, the elastic rope 21 will pull the sealing ball 22 to seal the inside of the air outlet pipe 19.

[0048] In this application, the probe 1 can be placed at the center of the fixing ring 28. At this time, the elastic ring 27 can apply pressure to the probe 1 to fix the probe 1. When performing magnetic variable calibration testing, different types of probes 1 will be used. In order to adapt to different probes 1, when the probe 1 is placed in the fixing ring 28, the elastic block 25 can be manually pressed to allow gas to enter the connecting rod 6. At this time, the gas will enter the elastic ring 27 along the first connecting groove 29, the second connecting groove 30 and the third groove, thereby causing the elastic ring 27 to expand and squeeze the probe 1 to fix different types of probes 1.

[0049] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0050] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection device for calibrating magnetic variables of a nuclear magnetic resonance spectrometer, comprising a probe (1) and a connecting frame (3), wherein a cable (2) is connected to the probe (1) and the cable (2) is used to connect to a detection host; Its features are: The top of the connecting frame (3) is provided with a sliding groove (4), and a slider (5) is slidably connected to the inner wall of the sliding groove (4). A connecting rod (6) is fixedly connected to the top surface of the slider (5), and a positioning component for positioning the probe (1) is provided on the connecting rod (6). The connecting frame (3) has grooves (8) on both sides. The inner wall of the groove (8) is rotatably connected to a guide wheel (9). A connecting line (7) is provided on the guide wheel (9). One end of the connecting line (7) is connected to the side wall of the slider (5).

2. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 1, characterized in that: The end of the connecting line (7) away from the slider (5) is fixedly connected to a rotating shaft (11). A hollow block (10) is rotatably connected to the bottom surface of the rotating shaft (11). A guide groove is provided on the top surface of the hollow block (10). A motor (14) is slidably connected to the guide groove. A first gear (12) is fixedly connected to the top surface of the rotating shaft (11). A second gear (13) that meshes with the first gear (12) is fixedly connected to the output end of the motor (14). The connecting line (7) passes through the hollow side wall.

3. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 2, characterized in that: The top surface of the hollow block (10) is provided with a pair of slots (17), and the outer side wall of the motor (14) is fixedly connected with a pair of connecting blocks (15). The connecting blocks (15) are slidably connected with a block (16) that engages with the slots (17).

4. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 1, characterized in that: The top end of the connecting rod (6) is open, and an adjusting rod (18) is slidably connected inside the connecting rod (6). The positioning component is located above the adjusting rod (18), and a moving component for controlling the adjusting rod (18) to move is provided on the connecting frame (3).

5. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 4, characterized in that: A hollow elastic block (25) is fixedly connected to the inner wall of the chute (4). An air inlet pipe (20) and an air outlet pipe (19) are connected inside the connecting rod (6). A connecting pipe (23) is connected inside the elastic block (25). The end of the connecting pipe (23) away from the elastic block (25) is connected to the air inlet pipe (20). A conduit (26) is connected inside the elastic block (25). A sealing cap is threaded to the top of the conduit (26). Both the air outlet pipe (19) and the air inlet pipe (20) are equipped with sealing elements.

6. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 5, characterized in that: The sealing element includes a pair of elastic ropes (21) fixed inside the air outlet pipe (19) and the air inlet pipe (20). A sealing ball (22) is provided inside the air outlet pipe (19) and the air inlet pipe (20). The sealing ball (22) is fixedly connected to the elastic rope (21). The ends of the air outlet pipe (19) and the air inlet pipe (20) that are close to each other are conical. A push rod (24) is fixedly connected to the bottom surface of the inner wall of the slide groove (4). The push rod (24) can extend into the air outlet pipe (19).

7. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 4, characterized in that: The positioning assembly includes a fixing ring (28) fixed to the top of the adjusting rod (18), and an elastic ring (27) is fixedly connected to the inner wall of the fixing ring (28).

8. The detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 7, characterized in that: The elastic ring (27) has a hollow structure inside. The adjusting rod (18) has a first connecting groove (29) inside. The fixing ring (28) has a second connecting groove (30) that communicates with the first connecting groove (29). The outer wall of the elastic ring (27) has a third connecting groove (31) that communicates with the second connecting groove (30).

9. A detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 2, characterized in that: A set of cylinders (33) are fixedly connected to the bottom surface of the connecting frame (3), and a suction cup (32) is fixedly connected to the bottom end of the cylinders (33).

10. A detection device for calibrating magnetic variable in a nuclear magnetic resonance spectrometer according to claim 9, characterized in that: The bottom end of the cylinder (33) is open, and the top end of the cylinder (33) is provided with a through groove (37) communicating with the slide groove (4). The inner wall of the cylinder (33) is sealed and slidably connected with a push plate (35). The top end of the push plate (35) is fixedly connected to the inner wall of the cylinder (33) with a spring. A ball (36) is rotatably connected inside the cylinder (33). When the slider (5) passes through the ball (36), the ball (36) will be driven to rotate. The surface of the ball (36) is fixedly connected with a limiting plate (34) to limit the push plate (35).

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