A cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom

Abstract

The present invention discloses a cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom, which relates to the technical field of physical property measurement. It includes a hollow sample rod and a support frame, and a temperature sensor is provided on the support frame. It also includes: a sample holder, a first rotation mechanism, a first driving mechanism, a second driving mechanism and a reset component. Through the cooperation among the first rotation mechanism, the first driving mechanism, the second driving mechanism, etc., the present invention adopts the transmission mode of a pull rope. Compared with the prior art that adopts the gear transmission mode, firstly, it reduces the cold leakage speed and improves the accuracy of detection data; secondly, it simplifies the cable layout mode and reduces the wiring difficulty in the prior art; thirdly, it avoids the problems existing in the prior art that the cable is easy to rotate with the hollow sample rod, is easy to have poor contact, and causes cable wear, resulting in a low service life of the equipment; fourthly, compared with the gear drive, the pull rope drive has a smaller return difference and improves the measurement accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of physical property measurement, and particularly relates to a cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom. Background Art

[0002] In the research and development process of new materials, physical property measurement is an essential link. By accurately measuring the physical properties of materials, the performance characteristics of materials can be understood, providing a basis for the optimization and application of materials; during physical property measurement, samples are often placed in a low-temperature and strong magnetic environment to measure the magnetic properties of materials.

[0003] Chinese Patent with Publication No. CN217180667U discloses a biaxial rotating low-temperature sample rod, which includes: a connecting rod and a sample holder located at the lower end of the connecting rod. A motor drive motor for driving the rotation of the sample is provided at the top of the connecting rod; the sample holder includes a fixing frame, and a first rotation unit and a second rotation unit are arranged inside the fixing frame. The first rotation unit can complete the vertical rotation of the sample, and the second rotation unit can complete the horizontal rotation of the sample. The above invention adopts a combination of multiple groups of gears and a rotation displacement table to realize high-precision two-axis rotation with variable temperature and temperature control for low-dimensional magnetic materials in the range of 1.6K to 400K under a strong magnetic field environment, that is, the rotation axis direction of the sample is the horizontal and vertical directions. Among them, the horizontal direction depends on the motor drive motor, and the vertical direction depends on the rotation displacement table; the design of the fixed clamping spring that always maintains elasticity effectively solves the rotation backlash generated when the electric control gear rotates in the reverse direction.

[0004] Although the above patent can effectively solve the problem of rotation backlash generated when the electric control gear rotates in the reverse direction, since the measurement is carried out in a low-temperature environment and a strong magnetic environment, the above patent directly uses a common motor and gear drive method to drive the rotation of the sample holder. However, the thermal conductivity of gear transmission is relatively high, resulting in cold leakage. At the same time, directly using the gear drive method to drive the rotation of the sample holder, due to the need for data transmission during the detection process, cables need to be arranged inside the connecting rod. And using the above patent directly with a common motor and gear drive method to drive the rotation of the sample holder increases the wiring difficulty, and at the same time, the cables are prone to rotate with the connecting rod, resulting in cable wear and easy poor contact problems.

[0005] Therefore, it is necessary to invent a cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: a cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range, comprising a hollow sample rod and a support frame, wherein a temperature sensor is provided on the support frame, and further comprising:

[0008] A sample holder is placed in a support frame, and a cantilever capacitive magnetic moment sensor is arranged on the top of the sample holder. The cantilever capacitive magnetic moment sensor comprises a support frame, a cantilever is arranged on the top of the support frame, an insulating substrate is arranged on the bottom of the support frame, an upper capacitor plate is arranged on the bottom of the cantilever, and a lower capacitor plate is arranged on the top of the insulating substrate;

[0009] A first rotating mechanism, which is rotatably connected to the support frame and driven by a first driving mechanism, and an angle sensor is provided between the first rotating mechanism and the support frame, so as to enable the sample holder to rotate in a first degree of freedom direction;

[0010] A second driving mechanism, which is disposed in the middle of the first rotating mechanism and is connected to the sample holder, and is capable of rotating the sample holder in a second degree of freedom direction;

[0011] a reset component, which is placed in a support frame at the bottom of the first rotating mechanism and is transmission-connected to the first rotating mechanism, and is used to reset the first rotating mechanism;

[0012] The first driving mechanism includes a protective cover and a first wire wheel sleeved on the outer side wall of the first rotating mechanism. The protective cover is sleeved on the top of the hollow sample rod. A second wire wheel driven by an outer rotor motor is rotatably arranged inside the protective cover. The first wire wheel and the second wire wheel are connected by a pull rope.

[0013] Preferably, the first rotating mechanism comprises two rotating shafts rotatably connected to the support frame;

[0014] The connecting frame is placed between the two rotating shafts and connected to the two rotating shafts.

[0015] Preferably, the second driving mechanism is a micro motor, and the micro motor is a stepping motor, a servo motor or a piezoelectric motor.

[0016] Preferably, the reset component comprises a reset shaft, both ends of which are rotatably connected to the inner side wall of the support frame;

[0017] Two third wire wheels connected by a pull rope transmission, which are distributed up and down, and are respectively sleeved on the reset shaft and the peripheral side wall of the first rotating mechanism;

[0018] The reset torsion member has one end connected to the side wall of the third wire wheel on the reset shaft, and the other end connected to the support frame.

[0019] Preferably, it also includes a box body, which is sleeved outside the support frame and has a temperature control mechanism and a magnetic field adjustment mechanism inside;

[0020] A sleeve, which is sleeved outside a hollow sample rod, whose top is connected to a first driving mechanism, and whose bottom is connected to a box body;

[0021] A gas scrubbing system, which includes a first solenoid valve, which is placed on the side wall of the top of the sleeve and one end of which is communicated with the inside of the sleeve;

[0022] A second solenoid valve, which is placed on the side wall of the bottom of the sleeve and one end of which is communicated with the inside of the sleeve;

[0023] A third solenoid valve, one end of which is communicated with the other ends of the first solenoid valve and the second solenoid valve through a first conduit, and the other end of which is connected to a vacuum pump;

[0024] A helium gas charging device, which is connected to the first conduit through an electromagnetic charging valve and a second conduit.

[0025] Preferably, the first driving mechanism further includes a first planetary gear reduction mechanism, whose input shaft is in transmission connection with the output shaft of an outer rotor motor;

[0026] A second planetary gear reduction mechanism, whose input shaft is in transmission connection with the output shaft of the first planetary gear reduction mechanism through a transmission sleeve, and whose output shaft is in transmission connection with the second wire pulley.

[0027] Preferably, it further includes a pull rope protection mechanism, and the pull rope protection mechanism includes a "U"-shaped frame fixedly connected to the inner arm of the protective cover; a set of pull rope guide wheels are provided at both ends thereof, the number of each set of pull rope guide wheels is two, and a pull rope guide wheel is connected to the middle thereof through a spring telescopic cylinder and a bracket.

[0028] Preferably, the transmission sleeve is connected to the first planetary gear reduction mechanism through an elastic resetting member, and the inner wall of its top end is slidably sleeved on the output shaft of the first planetary gear reduction mechanism through a spline; the middle part of it rotates and is slidably sleeved in the input shaft of the second planetary gear reduction mechanism, and the outer side wall of the other end of it is slidably sleeved on the inner wall of the output shaft of the second planetary gear reduction mechanism through a spline, teeth are provided on the circumferential side wall of the middle part of it, tooth grooves matched with the teeth are provided on the inner wall of the output shaft of the second planetary gear reduction mechanism, and a rotating groove for rotatably connecting with the bottom spline of the transmission sleeve is provided in the output shaft of the second planetary gear reduction mechanism.

[0029] Preferably, it further includes a tapered sleeve, which is sleeved on the top end of the transmission sleeve;

[0030] An "L"-shaped connecting rod, one end of which is connected to the free end of the spring telescopic cylinder, the other end of which abuts against the inclined surface of the tapered sleeve, an elastic deformation part is provided in the middle of its horizontal section, and inclined pieces are obliquely provided on the side wall of the middle of its horizontal section;

[0031] An electric telescopic rod, which is placed on the top of the inclined piece.

[0032] Preferably, it further includes a braking assembly, and the braking assembly includes a brake disc placed on the top of the second wire wheel;

[0033] a friction plate, which is connected to the bottom of the housing of the second planetary gear reduction mechanism through a return spring;

[0034] a linkage member, one end of which is placed on the top of the friction plate, the other end of which is located between the inclined plate and the electric telescopic rod, and the other end is provided with an elastic inclined portion that cooperates with the electric telescopic rod;

[0035] The circumferential side wall of the free end of the electric telescopic rod is provided with an avoidance groove for avoiding the elastic inclined portion.

[0036] The technical effects and advantages of the present invention:

[0037] Through the cooperation between the first rotating mechanism, the first driving mechanism and the second driving mechanism, etc., on the one hand, the present invention adopts the transmission mode of the pull rope. Compared with the prior art that adopts the gear transmission mode, the cold leakage speed is reduced, so that the temperature at the sample holder tends to be stable, thereby improving the accuracy of the detection data; on the other hand, the present invention adopts the transmission mode of the pull rope. Compared with the prior art that adopts the gear transmission mode, the cable layout method is simple, reducing the wiring difficulty in the prior art; on the third hand, it avoids the problems that the cable in the prior art is easy to rotate with the hollow sample rod, resulting in poor contact, and the cable is worn, resulting in a low service life of the equipment. On the fourth hand, the pull rope drive has a smaller return difference compared with the gear drive in the prior art.

[0038] Through the cooperation between the first rotating mechanism, the first driving mechanism and the second driving mechanism, etc., by adjusting the first driving mechanism, when adjusting the rotation angle of the first rotating mechanism, rough adjustment and fine adjustment can be carried out, thereby avoiding the problem of inaccurate detection data caused by rough adjustment.

[0039] 3. Through the cooperation between the first rotating mechanism, the first driving mechanism and the second driving mechanism, etc., during the rough adjustment process, when the pull rope passing through the support frame gets stuck with the support frame, the pull rope is tightened, moving the spring telescopic cylinder towards the second wire wheel side. The telescopic end of the spring telescopic cylinder extends and will push the "L"-shaped connecting rod to move rightward. The rightward movement of the "L"-shaped connecting rod will push the conical sleeve to move downward. The downward movement of the conical sleeve will push the transmission sleeve to move downward, so that the transmission sleeve slides downward from the initial position, thereby reducing the transmission ratio. By reducing the transmission ratio, the rotation speed of the second wire wheel is reduced, giving sufficient response time for the actuator, thereby avoiding the problem that when the pressure value detected by the pressure sensor is greater than the preset value, the second wire wheel cannot be stopped in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0041] Figure 2 Schematic diagram of the structural connection between the first driving mechanism, support frame, hollow sample rod and sleeve of the present invention.

[0042] Figure 3 For the present invention Figure 2 Exploded view of the structural parts.

[0043] Figure 4 Schematic diagram of the internal structure of the support frame of the present invention.

[0044] Figure 5 Schematic diagram of the cantilever beam capacitive magnetic moment sensor of the present invention.

[0045] Figure 6 Top view of the sample holder of the present invention.

[0046] Figure 7 Schematic diagram of the internal structure of the protective cover of the present invention.

[0047] Figure 8 Exploded view of the outer rotor motor, first planetary gear reduction mechanism, transmission sleeve and hollow sample rod parts of the present invention.

[0048] Figure 9 Cross-sectional view of the second planetary gear reduction mechanism of the present invention.

[0049] Figure 10 Exploded view of the parts of the second planetary gear reduction mechanism of the present invention.

[0050] Figure 11 Schematic diagram of the structural connection between the transmission sleeve and the input shaft and output shaft of the second planetary gear reduction mechanism when the transmission sleeve is in the initial position of the present invention.

[0051] Figure 12 Schematic diagram of the structural connection between the transmission sleeve and the input shaft and output shaft of the second planetary gear reduction mechanism when the transmission sleeve is in the fine adjustment position of the present invention.

[0052] Figure 13 Schematic diagram of the structural connection between the cable protection mechanism, conical sleeve, "L"-shaped connecting rod, electric telescopic rod and braking component of the present invention.

[0053] Figure 14 For the present invention Figure 13 Three-dimensional diagram of another angle of the structure.

[0054] Figure 15 For the present invention Figure 14 Front view of the structure.

[0055] Figure 16 Schematic diagram of the structural connection between the "L"-shaped connecting rod and the linkage of the present invention.

[0056] In the figure: 1. Hollow sample rod; 101. Thermal shielding plate; 2. Support frame; 21. Isolation cover; 3. Sample holder; 31. Support frame; 32. Cantilever beam; 33. Insulating substrate; 34. Upper capacitor plate; 35. Lower capacitor plate; 4. First rotating mechanism; 41. Rotating shaft; 42. Connecting frame; 5. First driving mechanism; 51. Protective cover; 5101. Upper cover body; 5102. Lower cover plate; 52. First wire pulley; 53. Outer rotor motor; 54. Second wire pulley; 55. First planetary gear reduction mechanism; 56. Second planetary gear reduction mechanism; 57. Transmission sleeve; 571. Tooth; 572. Tooth groove; 573. Rotating groove; 58. Cable protection mechanism; 581. "U" - shaped frame; 582. Cable guide pulley; 583. Spring telescopic cylinder; 59. Elastic reset member; 510. Tapered sleeve; 511. "L" - shaped connecting rod; 5111. Elastic deformation part; 5112. Inclined piece; 512. Electric telescopic rod; 513. Braking assembly; 5131. Brake disc; 5132. Friction plate; 5133. Linking member; 5134. Elastic inclined part; 5135. Avoidance groove; 6. Second driving mechanism; 7. Reset component; 71. Reset shaft; 72. Third wire pulley; 73. Reset torsion member; 8. Box body; 81. Gate valve; 9. Sleeve; 10. First solenoid valve; 11. Second solenoid valve; 12. Third solenoid valve; 13. First conduit; 14. Electromagnetic inflation valve; 15. Second conduit; 16. Cable conduit. Detailed implementation mode

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0058] As Figure 1-6 shown, a cantilever beam test magnetic moment system with a wide temperature range and multiple degrees of freedom includes a hollow sample rod 1 and a support frame 2, and a temperature sensor is provided on the support frame 2. In the present invention, the hollow sample rod 1 is set as a hollow structure to facilitate the passing of cables. In the present invention, a temperature sensor is provided to monitor the temperature near the support frame 2 in real - time so as to adjust the temperature in a timely manner.

[0059] As Figure 5 and Figure 6As shown, it also includes a sample holder 3, which is placed in the support frame 2, and a cantilever beam capacitive magnetic moment sensor is provided on the top of the cantilever beam capacitive magnetic moment sensor, which includes a support frame 31, a cantilever beam 32 is provided on the top of the support frame 31, an insulating substrate 33 is provided on the bottom of the support frame 31, an upper capacitor plate 34 is provided on the bottom of the cantilever beam 32, and a lower capacitor plate 35 is provided on the top of the insulating substrate 33; the present invention obtains the capacitance between the upper capacitor plate 34 and the lower capacitor plate 35, reverses the capacitor spacing through the capacitance obtained in real time, and then reverses the magnetic moment according to the capacitor spacing.

[0060] like Figure 4 As shown, the first rotating mechanism 4 is rotatably connected to the support frame 2 and is driven by the first driving mechanism 5. A rotation angle sensor is provided between the first rotating mechanism 4 and the support frame 2, so that the sample holder 3 can rotate in the first degree of freedom direction. The present invention arranges a rotation angle sensor to detect the rotation angle of the first rotating mechanism 4, so as to accurately control the rotation angle of the first rotating mechanism 4.

[0061] like Figure 4 As shown, the second driving mechanism 6 is placed in the middle of the first rotating mechanism 4, and is connected to the sample holder 3, so that the sample holder 3 can rotate in the second degree of freedom direction; specifically, the second driving mechanism 6 in this embodiment is a micro motor, and the micro motor is a stepping motor or a servo motor or a piezoelectric motor. The preferred embodiment of the present invention is a piezoelectric motor, and the output shaft of the piezoelectric motor is connected to the sample holder 3. The present invention controls the operation of the piezoelectric motor, and the operation of the piezoelectric motor will drive the sample holder 3 to rotate in the second degree of freedom direction, thereby realizing the second degree of freedom angle adjustment. Thereby, multiple degrees of freedom adjustment are realized.

[0062] like Figure 4 As shown, the reset component 7 is placed in the support frame 2 at the bottom of the first rotating mechanism 4 and is transmission-connected to the first rotating mechanism 4 for resetting the first rotating mechanism 4. The present invention sets a reset component 7 to drive the first rotating mechanism 4 to reset to the initial position after detection.

[0063] like Figure 3 and Figure 4As shown in the figure, the first driving mechanism 5 includes a protective cover 51 and a first wire wheel 52 sleeved on the outer sidewall of the first rotating mechanism 4. The protective cover 51 is sleeved on the top of the hollow sample rod 1. A second wire wheel 54 driven by an outer rotor motor 53 is rotatably arranged in the protective cover 51. The first wire wheel 52 and the second wire wheel 54 are connected by a pulling rope. Specifically, in this embodiment, the pulling rope is made of a high molecular nylon material, which can be Kevlar or Dyneema, etc. In the present invention, by controlling the rotation of the outer rotor motor 53, the rotation of the outer rotor motor 53 will drive the rotation of the second wire wheel 54. The rotation of the second wire wheel 54 will wind up the pulling rope, so that under the action of the pulling rope, the first wire wheel 52 is driven to rotate, and then the first rotating mechanism 4 is driven to rotate, thereby realizing the rotation in the first degree-of-freedom direction. The outer rotor motor 53 is a prior art and will not be elaborated here. It should be emphasized that the outer rotor motor 53 is sleeved on the top of the hollow sample rod 1.

[0064] As Figure 4 shown, further, the first rotating mechanism 4 includes two rotating shafts 41 rotatably connected to the support frame 2.

[0065] A connecting frame 42 is disposed between the two rotating shafts 41 and is connected to the two rotating shafts 41.

[0066] When the first wire wheel 52 rotates, it will drive the rotation of the rotating shaft 41. The rotation of the rotating shaft 41 will drive the rotation of the connecting frame 42, and finally realize the rotation in the first degree-of-freedom direction.

[0067] Further, the reset component 7 includes a reset shaft 71, the two ends of which are rotatably connected to the inner sidewall of the support frame 2.

[0068] Two third wire wheels 72 connected by a pulling rope are distributed up and down, and are respectively sleeved on the reset shaft 71 and the peripheral sidewall of the first rotating mechanism 4.

[0069] A reset torsion member 73, one end of which is connected to the sidewall of the third wire wheel 72 on the reset shaft 71, and the other end of which is connected to the support frame 2.

[0070] In the present invention, by setting the third wire wheel 72, when the first driving mechanism 5 drives the first rotating mechanism 4 to rotate, the rotation of the first rotating mechanism 4 will drive the rotation of the third wire wheel 72 on the first rotating mechanism 4. At the same time, the pulling rope on the third wire wheel 72 on the first rotating mechanism 4 will drive the rotation of the third wire wheel 72 on the reset shaft 71. The rotation of the third wire wheel 72 on the reset shaft 71 will drive the rotation of the reset shaft 71 after overcoming the torsion of the reset torsion member 73. The rotation of the reset shaft 71 will twist and store energy in the reset torsion member 73, so as to drive the reset of the first rotating mechanism 4 when the first driving mechanism 5 stops working subsequently.

[0071] It further includes a box body 8, which is sleeved outside the support frame 2, and a temperature control mechanism and a magnetic field adjustment mechanism are arranged inside it.

[0072] A sleeve 9 is sleeved outside the hollow sample rod 1, its top is connected to the first driving mechanism 5, and its bottom is connected to the box body 8. Further, in this embodiment, when the system needs static exchange gas refrigeration, the sleeve 9 and the box body 8 can be directly sealed and connected.

[0073] In another embodiment, as Figure 1 shown, when the system needs dynamic exchange gas refrigeration, the sleeve 9 and the box body 8 are sealed and connected through a gate valve 81.

[0074] Specifically, the protective cover 51 includes an upper cover body 5101 and a lower cover plate 5102. The lower cover plate 5102 is fixedly sleeved on the peripheral side wall of the hollow sample rod 1. The top of the lower cover plate 5102 is connected to the upper cover body 5101, and the bottom of the lower cover plate 5102 is connected to the top of the box body 8 through the sleeve 9.

[0075] Further, this embodiment also includes a gas washing system, which includes a first electromagnetic valve 10 placed on the top side wall of the sleeve 9 and one end of which is communicated with the inside of the sleeve 9.

[0076] A second electromagnetic valve 11 is placed on the bottom side wall of the sleeve 9 and one end of which is communicated with the inside of the sleeve 9.

[0077] A third electromagnetic valve 12, one end of which is communicated with the other ends of the first electromagnetic valve 10 and the second electromagnetic valve 11 through a first conduit 13, and the other end of which is connected to a vacuum pump.

[0078] A helium gas filling device is communicated with the first conduit 13 through an electromagnetic filling valve 14 and a second conduit 15.

[0079] In the present invention, by setting a gas washing component, during gas washing, the first electromagnetic valve 10, the second electromagnetic valve 11, the third electromagnetic valve 12 and the electromagnetic filling valve 14 are controlled to be closed; the vacuum pump is started, and then the third electromagnetic valve 12, the second electromagnetic valve 11 and the first electromagnetic valve 10 are opened in sequence; after pumping until the air pressure is less than a preset value, then the third electromagnetic valve 12 is closed, the electromagnetic filling valve 14 is opened, helium gas is filled, then the electromagnetic filling valve 14 is closed, and the third electromagnetic valve 12 is opened again, and the above-mentioned gas filling and pumping steps are repeated for three to four times to complete gas washing.

[0080] Further, to reduce the loss of cold quantity, this embodiment also includes an isolation cover 21, which is threadedly connected to the outer side wall of the support frame 2 and has micropores communicated with the box body 8 at its bottom; by setting the isolation cover 21 in the present invention, when dynamic exchange of cold quantity occurs, the influence of air flow on the accuracy of the detection data of the cantilever beam capacitive magnetic moment sensor can be prevented; at the same time, the loss of cold quantity can be reduced.

[0081] A plurality of heat shield plates 101 are arranged in an array on the peripheral side wall of the hollow sample rod 1.

[0082] It further includes a drawstring conduit 16, one end of which is connected to the support frame 2, the other end is connected to the protective cover 51, and the middle part thereof penetrates through the thermal shielding plate 101. By providing the drawstring conduit 16, the present invention reduces the exchange of cold quantity between the inside of the sleeve 9 and the inside of the isolation cover 21, and reduces the loss of cold quantity.

[0083] During installation, first control the gate valve 81 to close, then insert the docking rod into the sleeve 9, and then control the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 12 and the electromagnetic inflation valve 14 to close; start the vacuum pump, and then sequentially open the third solenoid valve 12, the second solenoid valve 11 and the first solenoid valve 10; evacuate until the air pressure is less than the preset value, then close the third solenoid valve 12, open the electromagnetic inflation valve 14, fill with helium gas, then close the electromagnetic inflation valve 14, and open the third solenoid valve 12 again, repeat the above inflation and evacuation three to four times to complete the gas washing.

[0084] During detection, by controlling the operation of the outer rotor motor 53, the operation of the outer rotor motor 53 will drive the second wire wheel 54 to rotate, the rotation of the second wire wheel 54 will further drive the first wire wheel 52 to rotate, the rotation of the first wire wheel 52 will drive the rotating shaft 41 to rotate, and the rotation of the rotating shaft 41 will drive the third wire wheel 72, the connecting frame 42 and the sample holder 3 to rotate, so as to realize the rotation in the first degree of freedom direction. Monitor the rotation angle of the rotating shaft 41 through the angle sensor, and rotate the first rotating mechanism 4 to the required position.

[0085] Then, by controlling the operation of the piezoelectric motor, the operation of the piezoelectric motor will drive the sample holder 3 to rotate, so as to realize the rotation in the second degree of freedom direction. Through the rotation of two degrees of freedom, the present invention ensures that the magnetic field can pass through the sample at multiple arbitrary angles, so as to realize the detection of multiple temperature zones and multiple angles.

[0086] Through the cooperation between the first rotating mechanism 4, the first driving mechanism 5 and the second driving mechanism 6, etc., on the one hand, the present invention adopts the transmission mode of the drawstring. Compared with the prior art that adopts the gear transmission mode, the cold quantity leakage speed is reduced, so that the temperature at the sample holder 3 tends to be stable, thereby improving the accuracy of the detection data; on the other hand, the present invention adopts the transmission mode of the drawstring. Compared with the prior art that adopts the gear transmission mode, the cable layout method is simple, and the wiring difficulty in the prior art is reduced; on the third hand, it avoids the problems existing in the prior art that the cable is easy to rotate with the hollow sample rod 1, resulting in poor contact, and the cable wear, resulting in low service life of the equipment; on the fourth hand, the drawstring drive has a smaller return difference compared with the gear drive. Embodiment 2

[0087] Although Example 1 can reduce cold leakage, during long-term detection and use, the pull rope is prone to wear. When the pull rope passes through the support frame 2, it is easy to cause the pull rope to get stuck in the support frame 2. If the pull rope is forcibly pulled, it is easy to cause the pull rope to break. At the same time, when adjusting the rotation angle of the first rotating mechanism 4 in Example 1, only coarse adjustment can be performed, resulting in inaccurate detection data. The following improvements are made based on Example 1.

[0088] As Figure 7-16 shown, the first driving mechanism 5 further includes a first planetary gear reduction mechanism 55, whose input shaft is in transmission connection with the output shaft of the outer rotor motor 53; the present invention realizes first-stage reduction transmission by setting the first planetary gear reduction mechanism 55. The first planetary gear reduction mechanism 55 is a prior art and will not be elaborated here.

[0089] A second planetary gear reduction mechanism 56, whose input shaft is in transmission connection with the output shaft of the first planetary gear reduction mechanism 55 through a transmission sleeve 57, and whose output shaft is in transmission connection with the second wire wheel 54. The present invention realizes second-stage reduction transmission by setting the first planetary gear reduction mechanism 55, thereby realizing fine adjustment.

[0090] As Figure 9 and Figure 10 shown, specifically, the second planetary gear reduction mechanism 56 includes a housing. An internal gear ring is provided inside the housing. A plurality of planet gears distributed in an array are meshed inside the internal gear ring. The planet gears are connected by a planet carrier. An output shaft extending outside the housing penetrates through the planet carrier. The same sun gear is meshed between the planet gears. An input shaft penetrating and extending outside the housing is provided on the sun gear.

[0091] A pull rope protection mechanism 58, the pull rope protection mechanism 58 includes a "U"-shaped frame 581 fixedly connected to the inner arm of the protective cover 51; a set of pull rope guide wheels 582 are provided at both ends thereof. The number of each set of pull rope guide wheels 582 is two. A pull rope guide wheel 582 is connected to the middle thereof through a spring telescopic cylinder 583 and a bracket; the present invention realizes the protection of the pull rope by setting the pull rope protection mechanism 58, thereby avoiding the breakage of the pull rope. A pressure sensor for detecting the tension of the pull rope is provided between the pull rope guide wheel 582 and the bracket.

[0092] When the pull rope passing through the support frame 2 gets stuck with the support frame 2, the pull rope is tightened, moving the spring telescopic cylinder 583 toward the second wire wheel 54 side, thereby preventing the pull rope passing through the support frame 2 from being broken when it gets stuck with the support frame 2. At the same time, the pressure sensor detects the pressure value for real-time detection of the pull rope tension.

[0093] The transmission sleeve 57 is connected to the first planetary gear reduction mechanism 55 through an elastic reset member 59. The inner wall of its top is slidably sleeved on the output shaft of the first planetary gear reduction mechanism 55 through a spline. The middle part of it rotates and is slidably sleeved in the input shaft of the second planetary gear reduction mechanism 56. The outer wall of the other end of it is slidably sleeved on the inner wall of the output shaft of the second planetary gear reduction mechanism 56 through a spline. A tooth 571 is provided on the circumferential side wall of the middle part of it. A tooth groove 572 that cooperates with the tooth 571 is provided on the inner wall of the output shaft of the second planetary gear reduction mechanism 56. A rotation groove 573 that is rotationally connected to the bottom spline of the transmission sleeve 57 is provided in the output shaft of the second planetary gear reduction mechanism 56.

[0094] In the present invention, by providing the transmission sleeve 57, when the transmission sleeve 57 is in the initial position, that is, the top is in transmission connection with the output shaft of the first planetary gear reduction mechanism 55, the middle part is rotationally connected to the input shaft of the second planetary gear reduction mechanism 56, and the bottom is in transmission connection with the inner wall of the output shaft of the second planetary gear reduction mechanism 56. At this time, by controlling the operation of the outer rotor motor 53, rough adjustment is realized. By adjusting the position of the transmission sleeve 57 to make the transmission sleeve 57 move downward. At this time, the top of the transmission sleeve 57 is in transmission connection with the output shaft of the first planetary gear reduction mechanism 55, the middle part of the transmission sleeve 57 is in transmission connection with the input shaft of the second planetary gear reduction mechanism 56, and the bottom of the transmission sleeve 57 is rotationally connected to the inner wall of the output shaft of the second planetary gear reduction mechanism 56. Then, by controlling the operation of the outer rotor motor 53, fine adjustment is realized.

[0095] It further includes a tapered sleeve 510, which is sleeved on the top end of the transmission sleeve 57.

[0096] An "L"-shaped connecting rod 511, one end of which is connected to the free end of the spring telescopic cylinder 583, the other end of which abuts against the inclined surface of the tapered sleeve 510. An elastic deformation part 5111 is provided in the middle of the horizontal section of it, and an inclined piece 5112 is obliquely provided on the side wall of the middle of the horizontal section of it.

[0097] An electric telescopic rod 512, which is placed on the top of the inclined piece 5112.

[0098] In the first aspect, in the present invention, by controlling the electric telescopic rod 512 to extend, the electric telescopic rod 512 will abut against the inclined piece 5112 when it extends. Continuing to control the electric telescopic rod 512 to extend, after overcoming the elastic forces of the elastic deformation part 5111 and the elastic reset member 59, the horizontal part of the "L"-shaped connecting rod 511 will move downward. The downward movement of the horizontal part of the "L"-shaped connecting rod 511 will push the tapered sleeve 510 downward. The downward movement of the tapered sleeve 510 will push the transmission sleeve 57 downward, so that the transmission sleeve 57 slides downward from the initial position, that is, from the position as shown in Figure 10 to the position as shown in Figure 11At the position shown, the top of the final drive sleeve 57 is drivingly connected to the output shaft of the first planetary gear reduction mechanism 55, the middle of the drive sleeve 57 is drivingly connected to the input shaft of the second planetary gear reduction mechanism 56, and the bottom of the drive sleeve 57 is rotatably connected to the inner wall of the output shaft of the second planetary gear reduction mechanism 56. Then, by controlling the operation of the outer rotor motor 53, the operation of the outer rotor motor 53 will drive the input shaft of the first planetary gear reduction mechanism 55 to rotate. After being decelerated by the first planetary gear reduction mechanism 55, it will finally drive the output shaft of the first planetary gear reduction mechanism 55 to rotate. The rotation of the output shaft of the first planetary gear reduction mechanism 55 will drive the drive sleeve 57 to rotate. The rotation of the drive sleeve 57 will drive the sun gear of the second planetary gear reduction mechanism 56 to rotate. The rotation of the sun gear of the second planetary gear reduction mechanism 56 will drive the planet gears to rotate. The rotation of the planet gears will drive the planet carrier to rotate. The rotation of the planet carrier drives the output shaft of the second planetary gear reduction mechanism 56 to rotate. After being decelerated by the second planetary gear reduction mechanism 56, a smaller transmission ratio can be obtained, so that fine adjustment can be achieved. The rotation of the output shaft of the second planetary gear reduction mechanism 56 will drive the second wire wheel 54 to rotate, and finally drive the second wire wheel 54 to rotate for fine adjustment.

[0099] In the second aspect, when the spring telescopic cylinder 583 moves towards the second wire wheel 54, it will push the "L"-shaped connecting rod 511 to contact the tapered sleeve 510, and finally push the tapered sleeve 510 to move downward. The downward movement of the tapered sleeve 510 will drive the drive sleeve 57 to move downward. Finally, the middle of the drive sleeve 57 will be rotationally connected to the input shaft of the second planetary gear reduction mechanism 56, and the bottom of the drive sleeve 57 will be rotationally connected to the output shaft of the second planetary gear reduction mechanism 56 for secondary deceleration, giving sufficient reaction time for the outer rotor motor 53 to execute, so as to avoid the problem that when the pressure value detected by the pressure sensor is greater than the preset value, the second wire wheel 54 cannot be stopped in time.

[0100] It further includes a braking assembly 513, and the braking assembly 513 includes a brake disc 5131 placed on the top of the second wire wheel 54. By setting the braking assembly 513 in the present invention, the locking of the second wire wheel 54 is realized, and the situation that the second wire wheel 54 rotates and resets due to the reset action of the reset component 7 during the switching process between rough adjustment and fine adjustment is avoided.

[0101] A friction plate 5132, which is connected to the bottom of the housing of the second planetary gear reduction mechanism 56 through a return spring.

[0102] A linkage member 5133, one end of which is placed on the top of the friction plate 5132, the other end of which is located between the inclined plate 5112 and the electric telescopic rod 512, and the other end is provided with an elastic inclined portion 5134 that cooperates with the electric telescopic rod 512.

[0103] The circumferential side wall of the free end of the electric telescopic rod 512 is provided with an avoidance groove 5135 for avoiding the elastic inclined portion 5134.

[0104] By controlling the electric telescopic rod 512 to extend, it will first come into contact with the elastic inclined portion 5134. Under the effect of the extension of the electric telescopic rod 512, the linkage member 5133 will be pushed to move downward. The downward movement of the linkage member 5133 will push the friction plate 5132 to come into contact with the brake disc 5131, thereby achieving the limitation of the second wire wheel 54.

[0105] When performing coarse adjustment, first control the outer rotor motor 53 to work. The operation of the outer rotor motor 53 will drive the input shaft of the first planetary gear reduction mechanism 55 to rotate, which will be decelerated by the first planetary gear reduction mechanism 55 and finally drive the output shaft of the first planetary gear reduction mechanism 55 to rotate. The rotation of the output shaft of the first planetary gear reduction mechanism 55 will drive the transmission sleeve 57 to rotate. Since the transmission sleeve 57 is in an initial state, its top is transmission-connected with the output shaft of the first planetary gear reduction mechanism 55, the middle is rotationally connected with the input shaft of the second planetary gear reduction mechanism 56, and the bottom is transmission-connected with the inner wall of the output shaft of the second planetary gear reduction mechanism 56. The rotation of the transmission sleeve 57 will drive the output shaft of the second planetary gear reduction mechanism 56 to rotate. The rotation of the output shaft of the second planetary gear reduction mechanism 56 will drive the second wire wheel 54 to rotate. The rotation of the second wire wheel 54 will drive the first wire wheel 52 to rotate. The rotation of the first wire wheel 52 will drive the rotating shaft 41 to rotate. The rotation of the rotating shaft 41 will drive the third wire wheel 72, the connecting frame 42 and the sample holder 3 to rotate, thereby realizing the rotation in the first degree of freedom direction and finally achieving coarse adjustment.

[0106] When performing fine adjustment, by controlling the electric telescopic rod 512 to extend, the linkage 5133 will be pushed to move downward. The downward movement of the linkage 5133 will push the friction plate 5132 to contact the brake disc 5131, thereby realizing the limit of the second wire wheel 54. Then, continue to control the electric telescopic rod 512 to extend until it contacts the inclined piece 5112. Continuing to control the electric telescopic rod 512 to extend, after overcoming the elastic force of the elastic deformation part 5111 and the elastic resetting part 59, the horizontal part of the "L"-shaped connecting rod 511 will move downward. The downward movement of the horizontal part of the "L"-shaped connecting rod 511 will push the tapered sleeve 510 to move downward. The downward movement of the tapered sleeve 510 will push the transmission sleeve 57 to move downward, so that the transmission sleeve 57 slides downward from the initial position. Finally, the top of the transmission sleeve 57 is in transmission connection with the output shaft of the first planetary gear reduction mechanism 55, the middle part of the transmission sleeve 57 is in transmission connection with the input shaft of the second planetary gear reduction mechanism 56, and the bottom of the transmission sleeve 57 is rotatably connected to the inner wall of the output shaft of the second planetary gear reduction mechanism 56. At this time, the avoidance groove 5135 corresponds to the elastic inclined part 5134, and the friction plate 5132 resets upward to release the limit of the second wire wheel 54. Then, by controlling the external rotor motor 53 to work, the work of the external rotor motor 53 will drive the input shaft of the first planetary gear reduction mechanism 55 to rotate. After being decelerated by the first planetary gear reduction mechanism 55, finally drive the output shaft of the first planetary gear reduction mechanism 55 to rotate. The rotation of the output shaft of the first planetary gear reduction mechanism 55 will drive the transmission sleeve 57 to rotate. The rotation of the transmission sleeve 57 will drive the input shaft and the sun gear of the second planetary gear reduction mechanism 56 to rotate. The rotation of the sun gear of the second planetary gear reduction mechanism 56 will drive the planet gear to rotate. The rotation of the planet gear will drive the planet carrier to rotate. The rotation of the planet carrier will drive the output shaft of the second planetary gear reduction mechanism 56 to rotate. After being decelerated by the second planetary gear reduction mechanism 56, a smaller transmission ratio can be obtained, so that fine adjustment can be realized. The rotation of the output shaft of the second planetary gear reduction mechanism 56 will drive the second wire wheel 54 to rotate, and finally drive the second wire wheel 54 to rotate for fine adjustment.

[0107] During the adjustment process, when the pulling rope passing through the support frame 2 gets stuck with the support frame 2, the pulling rope is tightened, and the spring telescopic cylinder 583 is moved towards the second wire wheel 54. The pressure sensor detects the pressure value to detect the pulling rope tension in real time. When the pressure value detected by the pressure sensor is greater than the preset value, control the external rotor motor 53 to stop working.

[0108] During the coarse adjustment process, when the pulling rope passing through the support frame 2 gets stuck with the support frame 2, the pulling rope is tightened, moving the spring telescopic cylinder 583 towards the second wire wheel 54. The telescopic end of the spring telescopic cylinder 583 extends and pushes the "L"-shaped connecting rod 511 to move rightward. The rightward movement of the "L"-shaped connecting rod 511 pushes the tapered sleeve 510 to move downward. The downward movement of the tapered sleeve 510 pushes the transmission sleeve 57 to move downward, so that the transmission sleeve 57 slides downward from the initial position, and finally the transmission sleeve 57 changes from the initial position to the fine adjustment position, thereby reducing the transmission ratio. Since the transmission ratio is high at the initial position and there is a time difference in data transmission and actuator execution, by reducing the transmission ratio and the rotational speed of the second wire wheel 54, sufficient reaction time is given to the outer rotor motor 53 to execute, thus avoiding the problem that when the pressure value detected by the pressure sensor is greater than the preset value, the second wire wheel 54 cannot be stopped in time.

[0109] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range, comprising a hollow sample rod and a support frame, wherein a temperature sensor is provided on the support frame, characterized in that: Also includes: A sample holder is placed in a support frame, and a cantilever capacitive magnetic moment sensor is arranged on the top of the sample holder. The cantilever capacitive magnetic moment sensor comprises a support frame, a cantilever is arranged on the top of the support frame, an insulating substrate is arranged on the bottom of the support frame, an upper capacitor plate is arranged on the bottom of the cantilever, and a lower capacitor plate is arranged on the top of the insulating substrate; A first rotating mechanism, which is rotatably connected to the support frame and driven by a first driving mechanism, and an angle sensor is provided between the first rotating mechanism and the support frame, so as to enable the sample holder to rotate in a first degree of freedom direction; A second driving mechanism, which is disposed in the middle of the first rotating mechanism and is connected to the sample holder, and is capable of rotating the sample holder in a second degree of freedom direction; a reset component, which is placed in a support frame at the bottom of the first rotating mechanism and is transmission-connected to the first rotating mechanism, and is used to reset the first rotating mechanism; The first driving mechanism includes a protective cover and a first wire wheel sleeved on the outer side wall of the first rotating mechanism. The protective cover is sleeved on the top of the hollow sample rod. A second wire wheel driven by an outer rotor motor is rotatably arranged inside the protective cover. The first wire wheel and the second wire wheel are connected by a pull rope.

2. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 1, characterized in that: The first rotating mechanism includes two rotating shafts rotatably connected to the support frame; The connecting frame is placed between the two rotating shafts and connected to the two rotating shafts.

3. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 1, characterized in that: The second driving mechanism is a micro motor, and the micro motor is a stepping motor, a servo motor or a piezoelectric motor.

4. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 1, characterized in that: The reset component includes a reset shaft, both ends of which are rotatably connected to the inner side wall of the support frame; Two third wire wheels connected by a pull rope transmission, which are distributed up and down, and are respectively sleeved on the reset shaft and the peripheral side wall of the first rotating mechanism; The reset torsion member has one end connected to the side wall of the third wire wheel on the reset shaft, and the other end connected to the support frame.

5. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 1, characterized in that: It also includes a box body, which is sleeved outside the support frame and has a temperature control mechanism and a magnetic field adjustment mechanism inside; A sleeve, which is sleeved outside the hollow sample rod, with a top connected to the first driving mechanism and a bottom connected to the box; The gas washing system includes a first solenoid valve, which is disposed on the top side wall of the sleeve and one end of which is connected to the interior of the sleeve; A second solenoid valve is disposed on the bottom side wall of the sleeve and one end of the second solenoid valve is connected to the interior of the sleeve; A third solenoid valve, one end of which is connected to the other end of the first solenoid valve and the other end of the second solenoid valve through the first conduit, and the other end of which is connected to a vacuum pump; The helium inflation device is connected with the first conduit through the electromagnetic inflation valve and the second conduit.

6. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 1, characterized in that: The first driving mechanism also includes a first planetary gear reduction mechanism, whose input shaft is drivingly connected to the output shaft of the outer rotor motor; The second planetary gear reduction mechanism has an input shaft drivingly connected to the output shaft of the first planetary gear reduction mechanism through a transmission sleeve, and an output shaft drivingly connected to the second wire wheel.

7. A cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 6, characterized in that: It also includes a rope protection mechanism, which includes a "U"-shaped frame fixedly connected to the inner arm of the protection cover; a group of rope guide wheels are provided at both ends, and each group of rope guide wheels has two rope guide wheels, and a rope guide wheel is connected to the middle part through a spring telescopic cylinder and a bracket.

8. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 7, characterized in that: The transmission sleeve is connected to the first planetary gear reduction mechanism through an elastic reset member, and the inner wall of the top end thereof is slidably sleeved up and down with the output shaft of the first planetary gear reduction mechanism through a spline; the middle portion thereof rotates and is slidably sleeved in the input shaft of the second planetary gear reduction mechanism, and the outer wall of the other end thereof is slidably sleeved with the inner wall of the output shaft of the second planetary gear reduction mechanism through a spline, the circumferential side wall of the middle portion is provided with teeth, the inner wall of the output shaft of the second planetary gear reduction mechanism is provided with tooth grooves matching the teeth, and the output shaft of the second planetary gear reduction mechanism is provided with a rotating groove rotatably connected to the spline at the bottom of the transmission sleeve.

9. The cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 8, characterized in that: It also includes a tapered sleeve, which is sleeved on the top of the transmission sleeve; An "L"-shaped connecting rod, one end of which is connected to the free end of the spring telescopic cylinder, and the other end of which is in contact with the inclined surface of the conical sleeve, an elastic deformation part is provided in the middle of the horizontal section, and an inclined plate is provided on the side wall of the middle of the horizontal section; An electric telescopic rod is placed on top of the tilting piece.

10. A cantilever beam magnetic moment testing system with multiple degrees of freedom in a wide temperature range according to claim 9, characterized in that: Also included is a brake assembly, the brake assembly including a brake disc disposed on top of the second reel; A friction plate connected to the bottom of the second planetary gear reduction mechanism housing through a return spring; A linkage member, one end of which is placed on the top of the friction plate, the other end of which is located between the tilting plate and the electric telescopic rod, and the other end of which is provided with an elastic tilting portion that cooperates with the electric telescopic rod; The side wall around the free end of the electric telescopic rod is provided with an avoidance groove for avoiding the elastic inclined part.

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