Water-cooled magnet low-temperature electric transmission running angle measurement device

Abstract

The present invention provides a device for measuring the low-temperature electric transmission angle of a water-cooled magnet, relating to the field of low-temperature measurement technology. The device comprises: a drive assembly, a transmission assembly, a measuring rod body, a chamber for holding a sample to be measured, and a measurement assembly; the drive assembly and the chamber for holding a sample to be measured are respectively disposed at both ends of the measuring rod body; the rotating portion and the slewing portion of the chamber for holding a sample to be measured are disposed oppositely on a supporting housing, and the sample stage achieves angular rotation via the rotating portion, while the sample stage achieves angular return via the slewing portion; the drive assembly is connected to the slewing portion via the transmission assembly, driving the transmission assembly to move in a direction parallel to the axis of the measuring rod body, thereby driving the sample to be measured to achieve angular rotation; the measurement assembly includes an angle acquisition module for acquiring angular changes in the sample to be measured and a data acquisition module for acquiring anisotropic data of the sample to be measured. The device has a simple structure and can perform high-precision electric transmission angle measurement of samples in the extreme environment of a water-cooled magnet at low temperatures and a strong magnetic field.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature measurement, and in particular to a water-cooled magnet low-temperature electric transmission operating angle measuring device. Background Art

[0002] Water-cooled magnets provide exceptional experimental conditions, far exceeding those of conventional superconducting magnets, at extremely low temperatures. They are a crucial experimental device for condensed matter physics. Material anisotropy refers to the fact that many materials exhibit varying properties in different directions. Measuring this anisotropy is crucial for both applications and the study of the principles underlying certain physical phenomena.

[0003] However, existing commercial gear-driven measuring rods cannot work properly in the extreme environment of low temperature and strong magnetic field of water-cooled magnets.

[0004] Based on this, the present application proposes a low-temperature electric transmission operating angle measuring rod that can adapt to the low-temperature and strong magnetic field environment of water-cooled magnets and has a simple structure, convenient operation and accurate measurement. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides a low-temperature electric transmission operating angle measurement device for a water-cooled magnet, which at least solves the problem that the existing technology cannot cope with the electric transmission operating angle measurement of samples in a water-cooled magnet.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A water-cooled magnet low-temperature electric transmission running angle measuring device, the device comprising:

[0010] A driving assembly, a transmission assembly, a measuring rod body, a chamber for holding a sample to be measured, and a measuring assembly;

[0011] The driving assembly and the sample holding chamber to be tested are respectively arranged at two ends of the measuring rod body;

[0012] The sample holding chamber includes a sample stage, a rotating portion, a swivel portion, and a supporting shell; the rotating portion and the swivel portion are oppositely arranged on both sides of the sample stage; the sample stage is rotated by the rotating portion, and the sample stage is rotated back to its original position by the swivel portion;

[0013] The driving assembly is connected to the rotating part through the transmission assembly, and the driving assembly drives the transmission assembly to move in a direction parallel to the axis of the measuring rod body;

[0014] The measuring component comprises an angle acquisition module for acquiring angle changes of the sample to be measured and a data acquisition module for acquiring anisotropic data of the sample to be measured.

[0015] In one embodiment, the transmission assembly includes a screw, a screw nut, and a transmission rod;

[0016] The output shaft of the driving assembly is connected to the screw rod, the screw rod nut is sleeved on the screw rod and movably connected to the screw rod, one end of the transmission rod is set on the screw rod nut, and the other end is connected to the rotating part.

[0017] Preferably, the driving component is a stepping motor or a rotating handwheel; and the screw is a ball screw.

[0018] In one embodiment, the transmission assembly further includes a guide rod, which is arranged parallel to the axis direction of the measuring rod body, and the screw nut is slidably sleeved on the guide rod.

[0019] Preferably, there are two guide rods, which are arranged on both sides of the screw rod.

[0020] More preferably, the guide rod is a smooth steel tube.

[0021] In one embodiment, the angle acquisition module includes a Hall plate, which is disposed on a sample stage, and an angle change of the Hall plate is equivalent to an angle change of the sample to be measured.

[0022] In another embodiment, the angle acquisition module includes a sliding rheostat, a slider of the sliding rheostat is provided on the transmission assembly, and a resistance change of the sliding rheostat is equivalent to an angle change of the sample to be measured.

[0023] Preferably, the sliding piece of the sliding rheostat is fixed on the lead screw nut.

[0024] In one embodiment, the rotating portion includes a line wheel, and the line wheel is embedded in a through hole opened on the side wall of the supporting shell.

[0025] Preferably, the transmission rod is connected to the rotating part through a steel wire.

[0026] In one embodiment, the rotating portion includes a rotating wheel, which is embedded in another through hole opened on the side wall of the supporting shell. The other through hole is arranged opposite to the through hole embedded in the rotating portion.

[0027] Preferably, a scroll spring is installed on the rotating wheel, and the scroll spring provides a rotating force for the rotating wheel.

[0028] In one embodiment, the device further comprises: a heat radiation screen, wherein the heat radiation screen is sleeved on the measuring rod body.

[0029] In one embodiment, the device also includes: an integrated shell, the integrated shell includes a shell bottom and a shell cover, one end of the screw rod passes through the shell bottom and the shell cover in sequence and is connected to the output shaft of the drive assembly; a groove is provided on the shell bottom, and a protrusion adapted to the groove is provided on the shell cover.

[0030] More preferably, an "O" ring is embedded in the groove.

[0031] In one embodiment, the transmission rod and the measuring rod body have the same wall thickness and / or are made of the same material.

[0032] In a preferred embodiment, a gasket is provided between the outer side of the rim of the rotary wheel and the line rotary wheel and the inner side of the supporting shell at the through hole.

[0033] More preferably, the gasket is a polytetrafluoroethylene gasket.

[0034] In one embodiment, a side of the sample stage that supports the sample to be tested is provided with a plurality of pin holes, and the sample to be tested is connected to the pin holes on the sample stage through pins; the other side of the sample stage that supports the sample to be tested is provided with contacts that correspond one-to-one to the plurality of pin holes and are electrically connected, each contact is independently electrically connected to a hole on the measuring instrument plug interface, and the external measuring instrument is electrically connected to the corresponding hole on the measuring instrument plug interface.

[0035] In a preferred embodiment, the sample to be tested is electrically connected to the sample stage via a sample holder.

[0036] In one embodiment, the measuring instrument socket is mounted on the housing.

[0037] Preferably, the measuring instrument plug interface is mounted on the housing via a mounting block.

[0038] (3) Beneficial effects

[0039] The present invention provides a water-cooled magnet low-temperature electric transmission operating angle measurement device. Compared with the existing technology, it has the following advantages:

[0040] The present application proposes a device for measuring the low-temperature electric transmission angle of a water-cooled magnet, comprising: a drive assembly, a transmission assembly, a measuring rod body, a chamber for holding a sample to be measured, and a measuring assembly; the drive assembly and the chamber for holding a sample to be measured are respectively disposed at both ends of the measuring rod body; the chamber for holding a sample to be measured includes a sample stage, a rotating portion, a slewing portion, and a supporting shell; the rotating portion and the slewing portion are arranged on either side of the sample stage and are oppositely disposed on the supporting shell, so that the sample stage can achieve angular rotation through the rotating portion and simultaneously, the sample stage can achieve slewing return through the slewing portion; the drive assembly is connected to the rotating portion via the transmission assembly, and the drive assembly drives the transmission assembly to move in a direction parallel to the axis of the measuring rod body; the measuring assembly includes an angle acquisition module for acquiring angular changes of the sample to be measured and a data acquisition module for acquiring anisotropic data of the sample to be measured. The device has a simple structure and can handle the measurement of the electric transmission angle of samples in water-cooled magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 Schematic diagram of the overall structure of the water-cooled magnet low-temperature electric transmission operating angle measurement device in an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the structure of the sample holding chamber in an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of the structure of the sample holding chamber when the sample stage is rotated by a certain angle in an embodiment of the present invention;

[0045] Figure 4 This is a schematic structural diagram of the transmission assembly and the housing bottom portion in an embodiment of the present invention;

[0046] Figure 5 Schematic diagram of the internal structure of the housing in an embodiment of the present invention;

[0047] Figure 6 This is a schematic structural diagram of a rotating portion (line wheel) in an embodiment of the present invention;

[0048] Figure 7 This is a schematic structural diagram of a rotating portion (rotating wheel) in an embodiment of the present invention;

[0049] Figure 8 An exploded view of the sample stage and sample holder structures in an embodiment of the present invention;

[0050] Figure 9 Schematic diagram of the sample stage structure from another perspective in an embodiment of the present invention;

[0051] Figure 10 This is a schematic diagram of the structure of the heat radiation screen in an embodiment of the present invention;

[0052] Figure 11 This is a schematic diagram of the assembly of the housing and the measuring instrument plug interface in an embodiment of the present invention;

[0053] In the figure: 2-transmission assembly; 3-measuring rod body; 4-sample holding chamber; 5-measuring assembly; 6-gasket; 7-thermal radiation shield; 8-integrated housing; 9-measuring instrument plug interface; 10-mounting block; 11-flange;

[0054] 21-screw; 22-screw nut; 23-transmission rod; 24-guide rod;

[0055] 41-sample stage; 42-rotating portion; 43-swivel portion; 44-support housing;

[0056] 51-angle acquisition module;

[0057] 81-shell bottom; 82-shell cover;

[0058] 411-sample holder; 412-cylindrical protrusion;

[0059] 811-groove; 821-protrusion. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0061] In materials research, the anisotropy of crystalline materials significantly influences their transport properties. Anisotropy refers to the variation in all or part of a substance's chemical, physical, or other properties with changes in direction, exhibiting different properties in different directions. Transport refers to the movement of various energy-carrying particles caused by internal inhomogeneities within a system or by modulation by external fields (temperature, electric, or magnetic fields). The gradients of various physical quantities represent the degree of this inhomogeneity, and the direction of transport of the corresponding physical quantity tends to eliminate the inhomogeneity. The transport process ceases only when this inhomogeneity is eliminated, and the system reaches equilibrium from a non-equilibrium state.

[0062] Water-cooled magnets can provide special experimental conditions with strong magnetic fields far exceeding those of ordinary superconducting magnets and extremely low temperatures. Measuring the anisotropy of materials is very important both for their applications and for studying the principles of certain physical phenomena.

[0063] However, existing commercial gear-driven measuring rods fail to function properly in the extreme low-temperature, high-magnetic-field environments of water-cooled magnets. Therefore, there is an urgent need for a low-temperature, electric-driven operating angle measuring rod that can withstand the extreme low-temperature, high-magnetic-field environments of water-cooled magnets, while also being simple in structure, easy to operate, and capable of precise measurement.

[0064] The present application provides a low-temperature electric transport operating angle measurement device for a water-cooled magnet, which at least solves the problem that the existing technology is unable to cope with the electric transport operating angle measurement of the sample to be tested in the water-cooled magnet, and achieves the purpose of measuring the electric transport properties of the sample to be tested in the strong magnetic field and low-temperature environment of the water-cooled magnet through a simple device.

[0065] The technical solution in the embodiments of the present application is to solve the above technical problems, and the overall idea is as follows:

[0066] In a water-cooled magnet, the direction of the magnetic field is vertically upward or vertically downward, and the direction of the magnetic field cannot be changed. However, when actually measuring the anisotropy of a sample in a water-cooled magnet, it is generally necessary to set magnetic fields of different directions to pass through the sample to be tested. Therefore, the need to change the direction of the magnetic field passing through the sample can only be met by rotating the angle of the sample to be tested. Based on this, the present application designs a drive component (such as a motor, handwheel, etc.) in conjunction with a transmission component (such as a screw, etc.) to pull the sample stage to rotate, driving the sample to be tested to rotate (the rotation of the sample stage is equivalent to the rotation of the sample to be tested fixed on it), thereby indirectly changing the direction of the magnetic field passing through the sample to be tested.

[0067] Since the measuring device is inside the water-cooled magnet, it is impossible to directly observe and read the rotation angle of the sample to be tested. The measuring device must be taken out every time the sample is rotated to measure the rotation angle, which is a cumbersome, time-consuming and labor-intensive process. Based on this, the present application adds a sliding rheostat, and makes the slider of the sliding rheostat move synchronously with the lead screw nut, so that the rotation angle of the sample to be tested can be indirectly fed back through the resistance value. When the motor drives the lead screw to rotate, the lead screw nut will move upward as the lead screw rotates, and the sample stage below will rotate synchronously by a certain angle, and the resistance value of the sliding rheostat will also change accordingly.

[0068] However, while it's known that the change in resistance of the sliding rheostat represents the rotation of the sample stage, the one-to-one correspondence between the resistance of the sliding rheostat and the sample stage's rotation angle is unclear. Based on this, the present application pre-calculates the distance the lead screw nut moves up and down when the sample stage rotates one full revolution, as well as the change in resistance of the sliding rheostat when the sample stage rotates one full revolution. This calculation yields the relationship between the distance the lead screw nut (or lead screw) moves when the motor drives it and the sample stage's rotation angle, enabling angle amplification (for example, equating 1° of sample stage rotation to tens or even hundreds of degrees of lead screw rotation, and 1° of sample stage rotation to the change in resistance of the sliding rheostat).

[0069] In addition, the correspondence between the angle of rotation of the sample stage, the angle of rotation of the screw, and the change in resistance of the sliding rheostat is only calculated and is not accurate. At this time, with the help of the principle that the resistance of the Hall plate will change sinusoidally according to the direction of the magnetic field, the specific value of the angle change is further calibrated by the resistance change of the Hall plate. Before calibration, stick the Hall plate on the position of the sample to be tested on the sample stage, rotate the sample stage, read the resistance values of the Hall plate and the sliding rheostat, and calculate the angle value of the sample stage rotation. The specific correspondence between the resistance value of the sliding rheostat and the rotation angle of the sample stage can be obtained, and then the linear relationship between the number of turns of the screw driven by the stepper motor and the rotation angle of the sample stage can be obtained. After the calibration is completed, the Hall plate can be removed.

[0070] The technical solution in the embodiments of this application, based on the aforementioned principles, proposes a device for measuring the low-temperature electric transmission angle of a water-cooled magnet. This device utilizes a stepper motor (or handwheel) for drive, combined with a high-precision ball screw transmission, to achieve precise power drive in strong magnetic fields and low temperatures. This precise power is then used to rotate the sample stage and the sample to be tested placed on the stage through a certain angle. A sliding rheostat is then used to achieve high-precision angle readings, thereby enabling measurement of the electric transmission angle of the sample to be tested in the extreme environment of a water-cooled magnet at low temperatures and strong magnetic fields. Furthermore, the device utilizes a rotating wheel equipped with a scroll spring to provide continuous rotational force for the sample stage and the sample to be tested, thereby improving the stability of the sample stage.

[0071] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0072] Due to the special structure of the water-cooled magnet, its sample cavity is an extremely slender hollow cylinder with a diameter of only 30mm and a length of more than 1700mm (the distance between the sample and the top of the sample cavity reaches 1511mm). In order to adapt to the shape of the sample cavity of the water-cooled magnet, the water-cooled magnet low-temperature electric transmission operating angle measurement device proposed in the embodiment of the application is also roughly in the shape of a long strip, such as Figure 1 shown.

[0073] See also Figure 1 The present embodiment proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device, which mainly includes: a driving component (not shown in the figure), a transmission component 2, a measuring rod body 3, a sample holding chamber 4, and a measuring component 5.

[0074] The drive assembly and the sample-receiving chamber 4 are respectively disposed at each end of the measuring rod body 3. The drive assembly provides power for the angular rotation of the sample, while the sample-receiving chamber 4 is used to accommodate the sample, which then undergoes angular rotation and rotational return within the chamber 4. It should be noted that in some preferred embodiments, the drive assembly is placed above the measuring rod body 3, rather than accompanying the sample into the water-cooled magnet. This prevents the influence of the low-temperature, strong magnetic field on the drive of the transmission assembly 2.

[0075] like Figure 2 and Figure 3 As shown, the sample holding chamber 4 includes a sample stage 41, a rotating portion 42, a swivel portion 43, and a support shell 44. The sample stage 41 is used to place the sample to be tested. The rotating portion 42 and the swivel portion 43 are rotatably mounted on the support shell 44. The rotating portion 42 and the swivel portion 43 are arranged in a row and opposite to each other on both sides of the sample stage 41, and the two opposite and adjacent sides are fixedly connected to the sample stage 41, so that the sample stage 41 can be rotated by the rotating portion 42 on the one hand, and can be rotated back to its original position by the swivel portion 43 on the other hand. In a specific implementation, the sample stage 41 is fixedly connected to the rotating portion 42 and the swivel portion 43 by low-temperature glue.

[0076] like Figure 1 、 Figure 2 As shown, the driving assembly is connected to the rotating part 42 through the transmission assembly 2. When the driving assembly drives the transmission assembly 2, the transmission assembly 2 will move in a direction parallel to the axis of the measuring rod body 3, thereby driving the sample stage 41 and the sample to be measured thereon to achieve angular rotation.

[0077] The measurement assembly 5 (corresponding to the position of the angle acquisition module 51 shown in the figure, which is part of the measurement assembly 5) is used to measure the angular change of the sample under test after rotation and the anisotropy data of the sample under test during the angular change. It primarily comprises the angle acquisition module 51 for acquiring the angular change of the sample under test, and a data acquisition module (not shown) for acquiring the anisotropy data generated by the angular change of the sample under test. In a preferred embodiment, the data acquisition module includes, but is not limited to, a thermometer. The thermometer is positioned on or near the sample under test to acquire the sample's temperature and temperature change in the high field.

[0078] In one embodiment, the angle acquisition module 51 includes, but is not limited to, a Hall effect sensor. The resistance of a Hall effect sensor varies sinusoidally with the direction of the magnetic field. Therefore, the rotation angle of the sample under test can be calculated by detecting the change in resistance of the Hall effect sensor. In a specific implementation, the Hall effect sensor is positioned on the sample stage so that its angle changes align with the angle of the sample under test.

[0079] However, the nonlinear nature of the sinusoidal curve's speed of change will lead to unstable accuracy when using the change in the Hall plate's resistance to read the sample's rotation angle. In addition, the Hall plate will occupy the measurement channel, and the Hall plate requires a magnetic field, but some samples do not require or cannot have a magnetic field applied during measurement. Based on this:

[0080] In another embodiment, Figure 4 As shown, in order to further improve the stability of the rotation angle reading accuracy and adapt to the measurement of different types of samples to be tested, the angle acquisition module 51 includes but is not limited to a sliding rheostat. A sliding rheostat is installed next to the screw rod 21 for reading the rotation angle of the sample to be tested. During specific implementation, the slider of the sliding rheostat is fixed on the screw nut 22, and a patch or resistance wire coil is provided at a position parallel to the screw rod 21 near the screw rod 21. The slider slides on the patch or resistance wire coil as the screw nut 22 moves, thereby changing the size of the resistance connected to the circuit. The one-to-one correspondence between the resistance value of the sliding rheostat and the rotation angle of the sample to be tested has been pre-calculated and calibrated, so the rotation angle of the sample to be tested can be determined based on the resistance value of the sliding rheostat. It should be noted that in some preferred embodiments, the sliding rheostat is arranged above the measuring rod body 3 and does not enter the water-cooled magnet with the sample to be tested. This can avoid the influence of the low-temperature strong magnetic field on the angle reading of the sliding rheostat.

[0081] See also Figure 1 、 Figure 4 and Figure 5 In one embodiment, the transmission assembly 2 includes a screw 21, a screw nut 22, and a transmission rod 23. The screw nut 22 is sleeved on the screw 21 and movably connected to the screw 21; one end of the transmission rod 23 is arranged on the screw nut 22, and the other end thereof is connected to the rotating part 42 of the sample holding chamber 4 to be tested. One end of the screw 21 is fixed to the end of the measuring rod body 3 close to the driving assembly through a bearing, and the other end of the screw 21 is connected to the output shaft of the driving assembly. When the driving assembly is working, the screw 21 rotates, and the screw nut 22 moves along the screw 21 toward the driving assembly, driving the transmission rod 23 to move along the axis parallel to the screw 21 toward the driving assembly. The movement of the transmission rod 23 further drives the rotating part 42 to rotate, thereby driving the sample stage 41 and the sample to be tested thereon to achieve angular rotation.

[0082] In a preferred embodiment, in order to achieve high-precision displacement control, the screw 21 is a ball screw. By combining a small-diameter, small-lead ball screw with the screw nut 22, high-precision position movement and stroke control can be achieved along a direction parallel to the axis of the screw 21.

[0083] In a preferred embodiment, the drive assembly is a stepper motor or a rotating handwheel. The stepper motor or the rotating handwheel achieves precise power drive under high field conditions. More preferably, the stepper motor is a 42 stepper motor.

[0084] The ball screw, combined with a stepper motor or a rotating handwheel, can achieve precise power drive and high-precision displacement and stroke control under high fields.

[0085] In one embodiment, the transmission assembly 2 further includes a guide rod 24. The guide rod 24 is used to guide the movement of the screw nut 22, ensuring that the movement direction of the screw nut 22 can be completely parallel to the axis of the measuring rod body 3. Figure 4 and Figure 5 As shown, the lead screw nut 22 is provided with a small hole through which the guide rod 24 passes and is slidably connected to the lead screw nut 22. The direction of the hole is completely parallel to the axis of the measuring rod body 3, thereby making the guide rod 24 parallel to the measuring rod body 3. When the lead screw nut 22 is driven by the drive assembly to move, the direction of movement is restricted by the guide rod 24, ensuring that the lead screw nut 22 moves completely along the direction parallel to the axis of the measuring rod body 3.

[0086] Preferably, there are two guide rods 24, which are arranged on both sides of the screw rod 21. More preferably, the guide rod 24 is a smooth steel tube.

[0087] In one embodiment, the rotating portion 42 includes but is not limited to a line wheel. Figure 6 As shown. The wire runner is embedded in a through hole opened on the side wall of the support shell 44, and the wire runner is rotatably connected to the inner side wall of the support shell 44. When the rotating part 42 includes a wire runner, the part of the transmission rod 23 connected to the rotating part 42 is preferably a steel wire, that is, the part of the transmission rod 23 located between the sample holding chamber 4 to be tested and the screw nut 22 is a cylindrical metal transmission rod 23, and a steel wire is selected between the cylindrical metal transmission rod 23 and the wire runner. Specifically, one end of the steel wire close to the transmission rod 23 is connected to the transmission rod 23, and the other end enters the interior of the sample holding chamber 4 to be tested through a wire hole opened on the sample holding chamber 4 to be tested, and is fixedly connected to the small hole reserved on the wire runner. When the screw nut 22 moves, the transmission rod 23 moves, driving the steel wire to run, thereby driving and controlling the movement of the wire runner, and the rotation of the wire runner will further drive the sample stage 41 and the sample to be tested on the sample stage 41 to rotate.

[0088] In one embodiment, the rotating portion 43 includes but is not limited to a rotating wheel. The rotating wheel structure is as follows Figure 7 As shown, the rotating wheel is embedded in another through-hole in the side wall of the support housing 44, which is located opposite the through-hole of the embedded rotating portion 42. The rotating wheel is also rotatably connected to the inner side wall of the support housing 44. Furthermore, a scroll spring is mounted on the rotating wheel to provide continuous rotational force. The deformation and return of the scroll spring controls the rotation and return of the sample stage 41 and the sample to be tested thereon.

[0089] Preferably, when the rotary wheel and the line rotary wheel are respectively embedded in the through hole opened on the side wall of the sample chamber, a gasket 6 is provided between the outer side of the rim of the rotary wheel and the line rotary wheel and the inner side of the support shell 44 at the through hole to reduce the friction between the rotary wheel and the line rotary wheel and the through hole wall. Figure 2 shown.

[0090] More preferably, the gasket 6 is a polytetrafluoroethylene gasket.

[0091] like Figure 8 As shown, in one embodiment, a side of the sample stage 41 that supports the sample to be tested is provided with a plurality of pin holes, and the other side of the sample stage 41 is provided with contacts that correspond to and are electrically connected to the plurality of pin holes, and each contact is electrically connected to a hole on the measuring instrument plug interface 9 through an independent wire (such as an enameled wire, etc.). The measuring instrument plug interface 9 is as shown in FIG. Figure 11 As shown. During specific implementation, one end of the wire (the upward end) is extended and led out through the hollow cavity inside the measuring rod body 3, and is electrically connected one by one with the holes on the measuring instrument plug interface 9. The other end of the wire (the downward end) is led out from the hollow cavity inside the measuring rod body 3 and introduced through the window at the end of the wire wheel, and is electrically connected to the contacts behind the sample stage. Preferably, the wire connecting the contacts on the sample stage after entering the wire wheel is configured to have an elastic or retractable structure (similar to a spring structure), which can avoid pulling and damaging the measuring wire when the sample stage rotates. After the sample to be measured is connected to the pin hole on the sample stage 41 through the pin, the external measuring instrument can be plugged into the corresponding holes on the measuring instrument plug interface 9 to achieve electrical connection according to the measurement data reading requirements.

[0092] like Figure 8As shown, in a more preferred embodiment, in order to allow the sample stage 41 to adapt to various different samples to be tested and to meet different measurement needs, the sample to be tested is detachably and electrically connected to the sample stage 41 through a sample holder 411 provided on the upper surface of the sample stage 41. Specifically, one side of the sample holder 411 is provided with pins corresponding one-to-one to the multiple pin holes on the sample stage 41, and on the other side of the sample holder 411, multiple copper disks are provided that correspond one-to-one to and are electrically connected to the above-mentioned pins on the sample holder 411. Different types of samples to be tested are electrically connected to the copper disks via wires according to actual measurement needs. The sample holder 411 connected to the sample to be tested is then plugged into the sample stage 41, and the sample to be tested can be connected to an external current source, measuring instrument, etc. through the holes on the measuring instrument plug interface 9 to meet the different measurement needs of the sample to be tested. In addition, a protrusion with good thermal conductivity is provided between the sample stage 41 and the sample holder 411. The protrusion facilitates better contact between the sample stage 41 and the sample holder 411, thereby avoiding the problem of poor thermal conductivity caused by the sample holder 411 being suspended in the air relative to the sample stage 41 when the sample holder 411 is inserted into the pin hole of the sample stage 41.

[0093] like Figure 8 and Figure 9 As shown, in a further preferred embodiment, a cylindrical protrusion 412 is fixedly connected to the bottom of the sample stage 41, which is used to wrap a heating wire to heat the sample to be tested. The heating wire ensures stable temperature control of the sample to be tested. Preferably, a cylindrical block is provided at the bottom of the cylindrical protrusion 412 to prevent the heating wire from falling off.

[0094] like Figure 1 、 Figure 5 、 Figure 10 As shown, in a preferred embodiment, the measuring device further includes a plurality of thermal radiation screens 7, which are mounted on the measuring rod body 3 and the transmission rod 23. On the one hand, the thermal radiation screens 7 can be used to block thermal radiation, and on the other hand, the thermal radiation screens 7 can limit the transmission direction of the transmission rod 23. In a specific implementation, holes are provided in the thermal radiation screens 7 to match the outer diameter and shape of the measuring rod body 3 and the transmission rod 23. The measuring rod body 3 and the transmission rod 23 are then sequentially passed through the holes provided in the plurality of thermal radiation screens 7 to achieve installation of the thermal radiation screens 7. More preferably, four thermal radiation screens 7 are provided at equal intervals along the extension direction of the measuring rod body 3.

[0095] In a further preferred embodiment, the transmission rod 23 is made of a stainless steel tube, which has the same wall thickness as the measuring rod body 3. The stainless steel tube has the same wall thickness as the measuring rod body 3, which can offset the transmission changes caused by the thermal expansion and contraction of the measuring rod body 3 during temperature changes.

[0096] like Figure 1As shown, in one embodiment, the above device further includes an integrated housing 8, which is provided at one end of the measuring rod body 3 close to the drive assembly, and wraps the drive assembly and part of the transmission assembly 2 therein.

[0097] Preferably, in order to ensure the airtightness when the integrated housing 8 is connected to the measuring rod body 3, one or more sealing rings (such as "O" rings, etc.) are provided at the position where the integrated housing 8 is connected to the measuring rod body 3.

[0098] See also Figure 1 、 Figure 4 、 Figure 5 ,as well as Figure 11 As shown, in a preferred embodiment, the integrated housing 8 comprises a housing base 81 and a housing cover 82. The end of the screw 21 connected to the output shaft of the drive assembly passes through the housing base 81, exits the through-hole defined in the top of the housing cover 82, and extends to the exterior of the housing to connect to the output shaft of the drive assembly. The screw nut 22, guide rod 24, and sliding rheostat are enclosed within the housing cover 82.

[0099] In order to ensure the tightness of the shell bottom 81 and the shell cover 82 during assembly, in a more preferred embodiment, a groove 811 is provided on the shell bottom 81, which cooperates with the corresponding protrusion 821 provided on the shell cover 82, so that the shell bottom 81 and the shell cover 82 can be pressed and sealed. More preferably, an "O" ring is provided at the contact point between the groove 811 and the protrusion 821 for sealing. When the protrusion 821 contacts the groove 811 and is pressed tightly, the "O" ring is squeezed and deformed to form a seal. For details, please refer to Figure 4 and Figure 5 .

[0100] In a further embodiment, the housing bottom 81 is provided with a flange 11, and the measuring rod body 3 is connected to the housing bottom 81 via the flange 11. When the measuring rod body 3 is inserted into the water-cooled magnet, the flange 11 is used to achieve a seal, isolating the water-cooled magnet from the internal and external environments.

[0101] More preferably, the flange 11 is a KF40 flange.

[0102] See also Figure 11 In another preferred embodiment, the measuring instrument plug-in interface 9 mentioned above can be installed at a suitable position on the shell cover 82 according to actual needs. Figure 11 As shown, in one embodiment, there are three measuring instrument plug-in interfaces 9, the two measuring instrument plug-in interfaces 9 on the left are used to connect the thermometer and the heater, and the other is used to connect the sliding rheostat, and the rightmost plug-in interface is used to measure the anisotropy data of the sample to be tested.

[0103] In one embodiment, the measuring instrument plug-in port 9 is mounted on the housing 82 via a mounting block 10. Specifically, a through hole is provided on the housing 82, and screw holes are symmetrically reserved near the through hole. Corresponding screw holes matching the positions of the screw holes are also provided on the mounting block 10, and a groove is provided on the surface of the mounting block 10 where it contacts the housing 82. An "O" ring is embedded in the groove. When the mounting block 10 is fastened to the housing 82 using screws, the "O" ring is squeezed and deformed to ensure sealing. Furthermore, a small hole is provided on the mounting block 10 for the measuring instrument plug-in port 9 to pass through, so that the measuring instrument plug-in port 9 can be connected to the mounting block 10 through the small hole and then mounted on the housing 82. Similarly, to ensure sealing performance, an "O" ring is provided at the position where the measuring instrument plug-in port 9 contacts the small through hole of the mounting block 10. The squeezing and deformation of the "O" ring further ensures a better seal.

[0104] The measurement principle and use process of the water-cooled magnet low-temperature electric transmission running angle measurement device proposed in this embodiment are as follows:

[0105] A stepper motor (or handwheel) drives the ball screw, which in turn precisely moves the screw nut 22 upward. The movement of the screw nut 22 drives the connected drive rod 23 upward, routing the wire, which in turn rotates the wire reel below, the sample stage 41, and the rotating wheel, tightening the scroll spring. When the screw nut moves downward, the drive rod 23 moves downward, routing the wire, and unwinding the scroll spring. The wire reel, sample stage 41, and rotating wheel then rotate.

[0106] The rotation of the sample stage 41 in the high field will drive the rotation of the sample to be measured on it. The sliding rheostat can use the change in resistance to feedback the angle change of the sample to be measured. At the same time, the Hall plate, thermometer, etc. set on the sample stage 41 will feedback the resistance and temperature values. The external measuring instrument is electrically connected to the sample stage 41 (or the sample holder 411 plugged into the sample stage 41) through the measuring instrument plug-in interface 9 and the measuring circuit, and then indirectly connected to the sample to be measured. The anisotropy of the sample to be measured in the high field can be measured by the external measuring instrument.

[0107] In summary, compared with the existing technology, the present invention has the following beneficial effects:

[0108] 1. This application proposes a device for measuring the low-temperature electric transmission angle of a water-cooled magnet, comprising: a drive assembly, a transmission assembly, a measuring rod body, a chamber for holding a sample to be measured, and a measuring assembly; the drive assembly and the chamber for holding a sample to be measured are respectively disposed at both ends of the measuring rod body; the chamber for holding a sample to be measured comprises a sample stage, a rotating portion, a slewing portion, and a supporting shell; the rotating portion and the slewing portion are disposed opposite each other on the supporting shell, and the sample stage is rotated by the rotating portion, while the sample stage is slewed back to its original position by the slewing portion; the drive assembly is connected to the rotating portion via the transmission assembly, and the drive assembly drives the transmission assembly to move in a direction parallel to the axis of the measuring rod body; the measuring assembly comprises an angle acquisition module for acquiring angle changes of the sample to be measured and a data acquisition module for acquiring anisotropic data of the sample to be measured. The device has a simple structure and can handle the measurement of the electric transmission angle of samples in the extreme environment of a water-cooled magnet at low temperatures and strong magnetic fields.

[0109] 2. The present application proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device, in which the driving component can select a stepper motor or a rotating hand wheel, which can realize manual and automatic conversion, and the driving is more flexible and accurate.

[0110] 3. The present application proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device, which can achieve high-precision displacement and angle amplification through the cooperation of a ball screw and a stepper motor (or a rotating handwheel), and can achieve high-precision angle reading through cooperation with a sliding rheostat.

[0111] 4. The present application proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device, which arranges the driving component, sliding rheostat, etc. directly above the measuring rod body, so that the driving component and the sliding rheostat for reading the angle are not affected by magnetic resistance, thereby avoiding the influence of low-temperature strong magnetic fields on angle driving and reading.

[0112] 5. The present application proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device. By using a transmission rod made of the same material as the main body of the measuring rod, the transmission changes caused by thermal expansion and contraction during temperature changes are greatly reduced, making the measurement results more accurate.

[0113] 6. This application proposes a water-cooled magnet low-temperature electric transmission operating angle measurement device. Using a scroll spring, it provides a continuously strong rotational force for the rotating part, while maintaining a simple and compact structure. This device maintains the stability of the sample stage angle under conditions such as magnet vibration and low temperatures, while significantly reducing return path error.

[0114] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A water-cooled magnet low-temperature electric transmission operating angle measurement device, characterized in that: The device comprises: a driving assembly, a transmission assembly (2), a measuring rod body (3), a sample receiving chamber (4), and a measuring assembly (5); The driving assembly and the sample holding chamber (4) are respectively arranged at two ends of the measuring rod body (3); The sample holding chamber (4) includes a sample stage (41), a rotating portion (42), a slewing portion (43), and a supporting shell (44); the rotating portion (42) and the slewing portion (43) are arranged oppositely on both sides of the sample stage (41); the sample stage (41) is rotated by the rotating portion (42), and the sample stage (41) is rotated back to its original position by the slewing portion (43); The driving assembly is connected to the rotating portion (42) via the transmission assembly (2), and the driving assembly drives the transmission assembly (2) to move in a direction parallel to the axis of the measuring rod body (3); The measuring component (5) comprises an angle acquisition module (51) for acquiring angle changes of the sample to be measured and a data acquisition module for acquiring anisotropic data of the sample to be measured; The driving assembly is placed above the measuring rod body (3) and does not enter the water-cooled magnet along with the sample to be measured; The transmission assembly (2) comprises a screw (21), a screw nut (22), and a transmission rod (23); the output shaft of the drive assembly is connected to the screw (21), the screw nut (22) is sleeved on the screw (21) and movably connected to the screw (21), one end of the transmission rod (23) is arranged on the screw nut (22), and the other end is connected to the rotating part (42); a portion of the transmission rod (23) connected to the rotating part (42) is a steel wire; The rotating portion (42) includes a line rotating wheel, which is embedded in a through hole opened on the side wall of the supporting shell (44); the rotating portion (43) includes a rotating wheel, which is embedded in another through hole opened on the side wall of the supporting shell (44), and the other through hole is arranged opposite to the through hole embedded in the rotating portion (42); a scroll spring is installed on the rotating wheel, and the scroll spring provides a rotating force for the rotating wheel; The angle acquisition module (51) comprises a sliding rheostat, a sliding piece of the sliding rheostat is arranged on the transmission component (2), and a change in the resistance value of the sliding rheostat is equivalent to a change in the angle of the sample to be measured.

2. The water-cooled magnet low-temperature electric transmission operating angle measuring device according to claim 1, characterized in that: The transmission assembly (2) further comprises a guide rod (24), the guide rod (24) being arranged parallel to the axis direction of the measuring rod body (3), and the screw nut (22) being slidably sleeved on the guide rod (24).

3. The water-cooled magnet low-temperature electric transmission operating angle measuring device according to claim 1, characterized in that: The angle acquisition module (51) includes a Hall plate. When the Hall plate is arranged on the sample stage (41), the angle change of the Hall plate is equivalent to the angle change of the sample to be measured.

4. The water-cooled magnet low-temperature electric transmission operating angle measuring device according to any one of claims 1 to 3, characterized in that: The device further comprises a heat radiation screen (7), wherein the heat radiation screen (7) is sleeved on the measuring rod body (3).

5. The water-cooled magnet low-temperature electric transmission operating angle measuring device according to claim 4, characterized in that: The device further comprises: an integrated housing (8), the integrated housing (8) comprising a housing bottom (81) and a housing cover (82), one end of the screw rod (21) passing through the housing bottom (81) and the housing cover (82) in sequence and then connected to the output shaft of the drive assembly; A groove is provided on the shell bottom (81), and a protrusion adapted to the groove is provided on the shell cover (82).

6. The water-cooled magnet low-temperature electric transmission operating angle measuring device according to claim 1, characterized in that: The transmission rod (23) and the measuring rod body (3) have the same wall thickness and / or the same material.

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