阅读说明：本技术 一种磁致扭矩测试装置及测试方法 (Magnetic torque testing device and testing method ) 是由 李永华 刘勋 胡晟 于 2020-12-10 设计创作，主要内容包括：本发明属于医疗器械测试领域,公开了一种磁致扭矩测试装置及测试方法,测试装置包括升降台、驱动件、角度电位器、扭矩传感器和载物台；驱动件固定于升降台；角度电位器套设在驱动件的输出轴上,并随输出轴的转动而转动；扭矩传感器包括壳体和设置在壳体上的扭转轴,扭矩传感器的壳体与输出轴固定连接,扭矩传感器随输出轴的转动而转动；载物台与扭转轴固定连接。本发明通过驱动件控制载物台的转动,实现自动调节载物台上的待测样品的角度,调节精度高；通过角度电位器直接测量待测样品的角度,并通过扭矩传感器直接测量待测样品的磁致扭矩,无需操作人员手动调节,且无需依靠目测读数,不仅可提高测量效率,而且可提高测量精度。(The invention belongs to the field of medical instrument testing, and discloses a magnetic torque testing device and a testing method, wherein the testing device comprises a lifting table, a driving piece, an angle potentiometer, a torque sensor and an objective table; the driving piece is fixed on the lifting platform; the angle potentiometer is sleeved on the output shaft of the driving piece and rotates along with the rotation of the output shaft; the torque sensor comprises a shell and a torsion shaft arranged on the shell, the shell of the torque sensor is fixedly connected with the output shaft, and the torque sensor rotates along with the rotation of the output shaft; the objective table is fixedly connected with the torsion shaft. The invention controls the rotation of the objective table through the driving piece, realizes the automatic adjustment of the angle of the sample to be measured on the objective table, and has high adjustment precision; the angle of the sample to be measured is directly measured through the angle potentiometer, the magneto torque of the sample to be measured is directly measured through the torque sensor, manual adjustment of an operator is not needed, visual measurement reading is not needed, the measurement efficiency can be improved, and the measurement precision can be improved.)

1. A magnetic torque testing device, comprising:

a lifting platform;

the driving piece is fixed on the lifting platform;

the angle potentiometer is sleeved on the output shaft of the driving piece and rotates along with the rotation of the output shaft;

the torque sensor comprises a shell and a torsion shaft arranged on the shell, the shell of the torque sensor is fixedly connected with the output shaft, and the torque sensor rotates along with the rotation of the output shaft;

the objective table, the objective table with torque sensor's torsion shaft fixed connection, the objective table is used for fixed sample that awaits measuring.

2. A magneto torque testing device according to claim 1,

the driving part comprises a non-magnetic stepping motor, a driving wheel, a driven wheel, a transmission belt and an output shaft, the driving wheel is in transmission connection with the non-magnetic stepping motor, the driving wheel is in transmission connection with the driven wheel through the transmission belt and used for driving the driven wheel to rotate, and the output shaft is fixedly connected with the driven wheel.

3. The magnetic torque testing device according to claim 2, further comprising a mounting base disposed at a bottom of the lifting table, wherein the nonmagnetic stepping motor and the driving wheel are fixed to the mounting base.

4. The magnetic torque testing device according to claim 2, further comprising a fixing base, wherein the fixing base is fixed to the lifting table, the driven wheel and the output shaft are rotatably disposed on the fixing base, one end of the output shaft is fixedly connected to the driven wheel, the other end of the output shaft is fixedly connected to the torque sensor, and the angle potentiometer is disposed on the fixing base and is rotatable relative to the fixing base.

5. The device of claim 4, wherein the elevating platform has a through hole, the fixing seat is disposed at the bottom of the elevating platform and corresponding to the through hole, and the angle potentiometer is disposed in the through hole.

6. The device according to claim 1, further comprising a base and a support, wherein the support is disposed on the base, and the lift table is disposed on the support in a height direction of the support so as to be liftable.

7. A magnetic torque testing device according to claim 6, wherein said number of said supporting members is four, and four of said supporting members are respectively disposed at four corners of said base.

8. A magnetic torque test method is used for testing the magnetic torque of a sample to be tested placed in a magnetic resonance device, and is characterized by comprising the following steps:

adjusting the height of the lifting platform to enable the sample to be detected on the objective table to be positioned in the center of a magnet of the magnetic resonance equipment;

the driving piece drives the angle potentiometer, the torque sensor and the objective table to rotate to different angles;

the angle potentiometer measures angle values when the objective table rotates to different angles;

the torque sensor measures torque values of the sample to be measured when the objective table rotates to different angles;

and obtaining the magneto-induced torques of the sample to be measured under different angles according to the angle value and the torque value.

9. The method of claim 8, wherein the measuring the angular value of the stage at different angles by the angular potentiometer comprises:

applying a fixed voltage to the angle potentiometer;

measuring output voltage when the angle potentiometer rotates to different angles;

measuring the resistance value of the angle potentiometer when the angle potentiometer rotates to different angles according to the output voltage;

and obtaining angle values when the objective table rotates to different angles according to the resistance value.

10. The method of claim 8, wherein the step of measuring the torque of the sample to be tested when the stage rotates to different angles by the torque sensor comprises:

after the driving piece drives the objective table to rotate to a certain angle, the sample to be tested is twisted under the action of the static magnetic field and drives the objective table to be twisted;

when the object stage is twisted, the torsion shaft of the torque sensor is driven to twist;

and acquiring the torque value of the sample to be detected according to the torsion angle of the torsion shaft.

Technical Field

The invention relates to the field of medical instrument testing, in particular to a magnetic torque testing device and a testing method.

Background

In recent years, magnetic resonance compatible surgical implants (e.g., implantable cardiac pacemakers, cardiac stents, etc.) have become popular, which require testing of their magneto-induced torque prior to marketing in accordance with the specifications set forth in international standard ASTM F2213. This is because the evaluation of the magneto-torque of the implant is particularly important in a magnetic resonance environment, since the medical device generates a magneto-torque due to the static magnetic field, which poses a certain risk in the examination of a patient having the implant in his body.

At present, the magnetic torque testing method in the existing standard has low automation degree, can be carried out by cooperation of a plurality of persons, and is time-consuming and labor-consuming. For example, the tested sample needs to be rotated 360 degrees to measure the torque at different angles, the process needs a tester to enter the magnetic resonance environment to manually adjust the angle, and if the measured data is large and fine, the tester needs to enter and exit the magnetic resonance environment for many times, and the manual adjustment needs to be carefully and manually adjusted, and the manual adjustment and the reading by means of visual inspection result in large measurement errors.

Disclosure of Invention

The invention aims to provide a device and a method for testing the magneto-induced torque, which can simplify the testing process and improve the testing precision.

The technical scheme provided by the invention is as follows:

in one aspect, a magnetic torque testing apparatus is provided, comprising:

a lifting platform;

the driving piece is fixed on the lifting platform;

the angle potentiometer is sleeved on the output shaft of the driving piece and rotates along with the rotation of the output shaft;

the torque sensor comprises a shell and a torsion shaft arranged on the shell, the shell of the torque sensor is fixedly connected with the output shaft, and the torque sensor rotates along with the rotation of the output shaft;

the objective table, the objective table with torque sensor's torsion shaft fixed connection, the objective table is used for fixed sample that awaits measuring.

Further preferably, the driving part comprises a non-magnetic stepping motor, a driving wheel, a driven wheel, a transmission belt and an output shaft, the driving wheel is in transmission connection with the non-magnetic stepping motor, the driving wheel is in transmission connection with the driven wheel through the transmission belt and used for driving the driven wheel to rotate, and the output shaft is fixedly connected with the driven wheel.

Further preferably, still include the mount pad, the mount pad set up in the bottom of elevating platform, no magnetism step motor with the drive wheel is fixed in the mount pad.

Further preferably, the lifting device further comprises a fixed seat, the fixed seat is fixed on the lifting platform, the driven wheel and the output shaft are rotatably arranged on the fixed seat, one end of the output shaft is fixedly connected with the driven wheel, the other end of the output shaft is fixedly connected with the torque sensor, and the angle potentiometer is arranged on the fixed seat and can rotate relative to the fixed seat.

Further preferably, a through hole is formed in the lifting platform, the fixing seat is arranged at the bottom of the lifting platform and corresponds to the through hole, and the angle potentiometer is located in the through hole.

Further preferably, the lifting platform further comprises a base and a supporting piece, wherein the supporting piece is arranged on the base, and the lifting platform is arranged on the supporting piece in a lifting manner along the height direction of the supporting piece.

Further preferably, the number of the supporting members is four, and the four supporting members are respectively arranged at four corners of the base.

In another aspect, a method for testing a magnetic torque of a sample to be tested placed in a magnetic resonance apparatus is provided, including:

adjusting the height of the lifting platform to enable the sample to be detected on the objective table to be positioned in the center of a magnet of the magnetic resonance equipment;

the driving piece drives the angle potentiometer, the torque sensor and the objective table to rotate to different angles;

the angle potentiometer measures angle values when the objective table rotates to different angles;

the torque sensor measures torque values of the sample to be measured when the objective table rotates to different angles;

and obtaining the magneto-induced torques of the sample to be measured under different angles according to the angle value and the torque value.

Further preferably, the measuring, by the angle potentiometer, the angle value when the stage rotates to different angles specifically includes:

applying a fixed voltage to the angle potentiometer;

measuring output voltage when the angle potentiometer rotates to different angles;

measuring the resistance value of the angle potentiometer when the angle potentiometer rotates to different angles according to the output voltage;

and obtaining angle values when the objective table rotates to different angles according to the resistance value.

Further preferably, the torque value of the sample to be measured when the torque sensor measures that the stage rotates to different angles specifically includes:

after the driving piece drives the objective table to rotate to a certain angle, the sample to be tested is twisted under the action of the static magnetic field and drives the objective table to be twisted;

when the object stage is twisted, the torsion shaft of the torque sensor is driven to twist;

and acquiring the torque value of the sample to be detected according to the torsion angle of the torsion shaft.

The invention has the technical effects that: the invention controls the rotation of the objective table through the driving piece, realizes the automatic adjustment of the angle of the sample to be measured on the objective table in the magnetic resonance equipment, and has high adjustment precision; the angle of the sample to be measured is directly measured through the angle potentiometer, the magneto torque of the sample to be measured is directly measured through the torque sensor, the magneto torque of the sample to be measured under different angles can be directly measured, manual adjustment of operators is not needed, visual measurement reading is not needed, the measuring efficiency can be improved, and the measuring precision can be improved.

Drawings

The invention is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a schematic structural diagram of a magnetic torque testing apparatus according to the present invention;

FIG. 2 is a schematic structural view of a magnetic torque testing device of the present invention without a stage;

FIG. 3 is a schematic view of a magnetic torque testing device of the present invention shown in another perspective view when the stage is not mounted;

FIG. 4 is a schematic flow chart of a method of testing a magnetic torque according to the present invention.

The reference numbers illustrate:

10. a lifting platform; 11. a through hole; 20. a drive member; 21. an output shaft; 22. a non-magnetic stepper motor; 23. a drive wheel; 24. a driven wheel; 25. a transmission belt; 30. an angle potentiometer; 40. a torque sensor; 41. a housing; 42. a torsion shaft; 50. an object stage; 60. a base; 70. a support member; 80. buckling; 90. a mounting seat; 100. a fixed seat.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

The present invention provides an embodiment of a magnetic torque testing apparatus, as shown in fig. 1 to 3, including a lifting platform 10, a driving member 20, an angle potentiometer 30, a torque sensor 40, and an object stage 50; the driving member 20 is fixed on the lifting table 10; the angle potentiometer 30 is sleeved on the output shaft 21 of the driving part 20 and rotates along with the rotation of the output shaft 21; the torque sensor 40 comprises a shell 41 and a torsion shaft 42 arranged on the shell 41, the shell 41 of the torque sensor 40 is fixedly connected with the output shaft 21, and the torque sensor 40 rotates along with the rotation of the output shaft 21; the stage 50 is fixedly connected to the torsion shaft 42 of the torque sensor 40, and the stage 50 is used for fixing a sample to be measured.

Specifically, the magnetic torque testing device is placed in the magnetic resonance equipment, a sample to be tested is fixedly installed on the magnetic torque testing device through a clamp, the sample to be tested is a surgical implant, and the torque of the sample to be tested under the action of a static magnetic field in the magnetic resonance equipment is tested through the magnetic torque testing device.

The driving part 20, the angle potentiometer 30, the torque sensor 40 and the objective table 50 of the magneto-induced torque testing device are all arranged on the lifting table 10, the lifting table 10 can be directly placed on a sickbed of the magnetic resonance equipment, and the height position of a sample to be tested on the objective table 50 in the magnetic resonance equipment can be adjusted through the lifting of the lifting table 10, so that the sample to be tested is positioned in the center of a magnet of the magnetic resonance equipment.

Preferably, as shown in fig. 1, the magnetic torque testing apparatus further includes a base 60 and a support 70, the support 70 is disposed on the base 60, and the lifting platform 10 is disposed on the support 70 in a height direction of the support 70. The base 60 can be placed on the sick bed of magnetic resonance equipment, because of the high difference of the sick bed of different magnetic resonance equipment to the magnetic resonance equipment magnet center, so through the height of adjusting elevating platform 10 apart from base 60, the height of objective table 50 apart from the sick bed on the adjustable elevating platform 10, and then adjust the height of the sample that awaits measuring apart from the sick bed on the objective table 50, so that the sample that awaits measuring is located the magnet center of magnetic resonance equipment, make this magnetic torque testing arrangement can use on different magnetic resonance equipment, improve magnetic torque testing arrangement's commonality.

The lifting platform 10 can be lifted by various means, such as manually or automatically, including electric drive, hydraulic drive, etc. When the lifting platform 10 is lifted manually, the magnetic torque testing device further comprises a buckle 80, and after the position of the lifting platform 10 on the support 70 is manually adjusted, the lifting platform is locked by the buckle 80 to ensure the height of the lifting platform 10 on the support 70, and of course, the lifting platform 10 can be fixed on the support 70 by bolts and the like. Preferably, the number of the supporting members 70 is four, and the four supporting members 70 are respectively disposed at four corners of the base 60, so as to improve the supporting stability of the supporting members 70 on the lifting table 10 and prevent the influence of the shaking of the lifting table 10 on the measurement accuracy.

The output shaft 21 of the driving member 20 is connected to the angle potentiometer 30 and the torque sensor 40, the driving member 20 may be a non-magnetic motor, the output shaft 21 of the non-magnetic motor may drive the angle potentiometer 30 to rotate when rotating, and the angle potentiometer 30 may measure the rotation angle of the output shaft 21.

Torque sensor 40 includes casing 41 and the torsion shaft 42 of setting on casing 41, torsion shaft 42 can not rotate relative casing 41 when not receiving external force, torsion shaft 42 only can rotate relative casing 41 when receiving external force, torque sensor 40's casing 41 and output shaft 21 fixed connection, torque sensor 40's torsion shaft 42 and objective table 50 fixed connection, output shaft 21 rotates and drives torque sensor 40's casing 41 when rotating, torque sensor 40's torsion shaft 42 can rotate along with torque sensor 40's casing 41 because of not receiving external force, and then drive objective table 50 and rotate together, the angle of the sample that awaits measuring in the magnetic resonance equipment on the adjustable objective table 50 when objective table 50 rotates.

Because the different angles of the sample to be measured in the magnetic resonance device result in different stresses of the sample to be measured in the magnetic field, and the different magnitudes of the torque are different when the stresses are different, the magneto-induced torques of the sample to be measured at different angles need to be measured, for example, the magneto-induced torques of the sample to be measured at 0 °, 10 °, 20 °, 30 ° … … 350 ° and 360 ° are measured respectively. According to the invention, the rotation of the objective table 50 is controlled by the driving part 20, so that the angle of the sample to be measured in the magnetic resonance equipment can be adjusted, the angle of the sample to be measured can be directly read by the angle potentiometer 30, manual adjustment and visual reading are not needed, the measurement efficiency can be improved, and the measurement precision can be improved.

After the sample to be measured is adjusted to a certain angle, under the effect of a static magnetic field in the magnetic resonance equipment, the sample to be measured can generate certain torque to enable the sample to be measured to rotate, the sample to be measured drives the objective table 50 and the torque shaft 42 of the torque sensor 40 to rotate when rotating, the torque sensor 40 can directly measure the torque value of the sample to be measured according to the rotation of the torque shaft 42, the torque value is directly measured through the torque sensor 40, compared with the mode that the torque value is measured by the torsion angle in the existing testing method, the process of converting the torsion angle into the torque through the torsion spring is omitted, the measuring process is simpler and more convenient, and the measuring error can be reduced.

In one embodiment, as shown in fig. 1, the driving member 20 includes a non-magnetic stepping motor 22, a driving wheel 23, a driven wheel 24, a transmission belt 25 and an output shaft 21, the driving wheel 23 is in transmission connection with the non-magnetic stepping motor 22, the driving wheel 23 is in transmission connection with the driven wheel 24 through the transmission belt 25 for driving the driven wheel 24 to rotate, and the output shaft 21 is fixedly connected with the driven wheel 24.

The angle of the sample to be detected is adjusted by controlling the step number of the nonmagnetic stepping motor 22, the nonmagnetic stepping motor 22 can be set to 10000 steps/360 degrees, and the angle of the sample to be detected in the magnetic resonance equipment is accurately controlled by controlling the nonmagnetic stepping motor 22 to work through Labview at the PC end.

When the nonmagnetic stepping motor 22 works, the driving wheel 23 is driven to rotate, when the driving wheel 23 rotates, the driven wheel 24 is driven to rotate through the driving belt 25, the driven wheel 24 rotates to drive the output shaft 21 to rotate, and the output shaft 21 rotates to drive the angle potentiometer 30, the torque sensor 40 and the objective table 50 to rotate. By providing the driving wheel 23 and the driven wheel 24, the rotation speed of the output shaft 21, and thus the rotation speed of the sample to be measured, can be adjusted. It should be noted that, in other embodiments, the rotation speed of the sample to be measured can also be adjusted through gear transmission.

Preferably, the driving member 20 is located at the bottom of the elevating platform 10, and the object stage 50 is located above the elevating platform 10. The magnetic torque testing device further comprises a mounting seat 90, the mounting seat 90 is arranged at the bottom of the lifting platform 10, and the non-magnetic stepping motor 22 and the driving wheel 23 are fixed on the mounting seat 90.

The bottom of elevating platform 10 still is equipped with fixing base 100, and output shaft 21 passes through ball bearing and rotates and set up on fixing base 100, follows driving wheel 24 and sets up on fixing base 100, and output shaft 21's one end and follow driving wheel 24 fixed connection, the other end and torque sensor 40 fixed connection, angle potentiometer 30 sets up on fixing base 100 and relative fixing base 100 rotates. The bottom of elevating platform 10 is equipped with mount pad 90 and fixing base 100, and no magnetism step motor 22 and drive wheel 23 set up on mount pad 90, and follow driving wheel 24 and output shaft 21 set up on fixing base 100, through optimizing the position that sets up of each component part of driving piece 20, can reduce the volume of magnetic torque testing arrangement.

Preferably, a through hole 11 is formed in the lifting platform 10, the fixing base 100 is disposed at the bottom of the lifting platform 10 and disposed corresponding to the through hole 11, and the angle potentiometer 30 is located in the through hole 11. The angle potentiometer 30 is disposed on the fixing base 100 and located in the through hole 11, so that the height of the magnetic torque testing device can be reduced, and the volume of the magnetic torque testing device can be further reduced.

The present invention further provides an embodiment of a method for testing a magneto-induced torque, as shown in fig. 4, including:

s10, adjusting the height of the lifting platform to make the sample to be measured on the objective table be located at the center of the magnet of the magnetic resonance equipment;

s20, driving the angle potentiometer, the torque sensor and the objective table to rotate to different angles by the driving piece;

s30 measuring the angle value when the objective table rotates to different angles by the angle potentiometer;

s40 the torque sensor measures the torque value of the sample to be measured when the objective table rotates to different angles;

and S50, obtaining the magneto-induced torques of the sample to be measured under different angles according to the angle value and the torque value.

Specifically, since the heights from the patient beds of the different magnetic resonance apparatuses to the center of the magnet of the magnetic resonance apparatus are different, before the test, the height of the lifting table 10 is adjusted so that the sample to be tested fixed on the stage 50 is located at the center of the magnet of the magnetic resonance apparatus.

And then, controlling the work of the driving element 20 through Labview at the PC end, and driving the angle potentiometer 30, the torque sensor 40 and the object stage 50 to rotate by the driving element 20, wherein the specific connection relationship of the angle potentiometer 30, the torque sensor 40 and the object stage 50 is described in the embodiment of the magnetic torque testing device, and is not described herein again. The driving member 20 is a stepping motor compatible with magnetic resonance, and the angle of the object stage 50 in the magnetic resonance device is precisely controlled by the stepping motor to replace manual adjustment by manpower.

The angle potentiometer 30 rotates together with the stage 50, and the rotation angle value of the stage 50 can be measured by the angle potentiometer 30.

The torque sensor 40 and the object stage 50 rotate together under the action of the driving member 20, the rotation angles of the torque sensor 40 and the object stage 50 are consistent, and when the sample to be measured on the object stage 50 is not subjected to an external force, the torque value of the sample to be measured on the object stage 50 measured by the torque sensor 40 is zero. When the sample to be measured on the stage 50 is twisted under the action of the magnetic field, the torque value of the sample to be measured can be measured by the torque sensor 40.

The angle of the objective table 50 is adjusted through the driving part 20 to change the angle of the sample to be measured in the magnetic resonance device, the angle value of the sample to be measured is measured through the angle potentiometer 30, the torque values of the sample to be measured at different angles are measured through the torque sensor 40, the torque values of the sample to be measured at different angles can be obtained according to the angle value and the torque value obtained through measurement, and then the maximum magneto-induced torque of the sample to be measured is obtained.

The method for testing the magneto-induced torque can realize the automatic control of the 360-degree angular rotation of the sample to be tested, and can directly obtain the angular value and the torque value of the sample to be tested through the angular potentiometer 30 and the torque sensor 40, thereby improving the measurement precision. In addition, the angle value and the torque value measured by the angle potentiometer 30 and the torque sensor 40 can be synchronously read to the PC end directly through a data acquisition card, manual recording of a tester is not needed, and the measurement efficiency and the measurement precision are improved.

Wherein, the angle value when S30 angle potentiometer measurement objective table rotates to different angles specifically includes:

s31 applying a fixed voltage to the angle potentiometer;

s32 measuring the output voltage when the angle potentiometer rotates to different angles;

s33, measuring the resistance value of the angle potentiometer when the angle potentiometer rotates to different angles according to the output voltage;

and S34, obtaining the angle values of the object stage when the object stage rotates to different angles according to the resistance value.

Specifically, the working principle of the angle potentiometer 30 is that when the angle potentiometer 30 rotates to different angles, the resistance value of the angle potentiometer 30 changes, a voltage is applied to the angle potentiometer 30, the resistance value of the angle potentiometer 30 at the angle can be measured by measuring the output voltage when the angle potentiometer 30 rotates to a certain angle, the rotation angle of the output shaft 21 passing through the angle potentiometer 30 can be obtained according to the resistance value of the angle potentiometer 30, the rotation angle of the output shaft 21 is the rotation angle of the stage 50, and therefore, the angle value when the stage 50 rotates to different angles can be measured by the angle potentiometer 30.

Wherein, S40 the torque value that torque sensor measured the sample that awaits measuring when the objective table rotates to different angles specifically includes:

s41, after the object stage is driven to rotate to a certain angle by the driving piece, the sample to be tested is twisted under the action of the static magnetic field and drives the object stage to be twisted;

s42, driving the torsion shaft of the torque sensor to twist when the object stage twists;

and S43, acquiring the torque value of the sample to be tested according to the torsion angle of the torsion shaft.

The torque sensor 40 comprises a housing 41 and a torsion shaft 42 arranged on the housing 41, the housing 41 of the torque sensor 40 is fixedly connected with the output shaft 21, the torsion shaft 42 of the torque sensor 40 is fixedly connected with the object stage 50, and the torsion shaft 42 cannot rotate relative to the housing 41 when being free from external force, so that when the output shaft 21 drives the housing 41 of the torque sensor 40 to rotate, the torque shaft 42 and the object stage 50 can be simultaneously driven to rotate together, and the rotation angles of the torque shaft 42 and the object stage 50 are the same. The torsion shaft 42 rotates relative to the housing 41 when being subjected to an external force, when a sample to be measured on the objective table 50 rotates under the action of a magnetic field of the magnetic resonance equipment, the objective table 50 is driven to rotate, the torsion shaft 42 of the torque sensor 40 is driven by the rotation of the objective table 50 to rotate relative to the housing 41 of the torque sensor 40, and then the torsion value of the sample to be measured can be automatically calculated through the torsion angle of the torsion shaft 42.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.