Measuring device for low-temperature electric transmission operation angle of water-cooled magnet

Abstract

The invention provides a low-temperature electric transmission operation angle measuring device for a water-cooled magnet, and relates to the technical field of low-temperature measurement. The device comprises a driving assembly, a transmission assembly, a measuring rod main body, a to-be-measured sample accommodating cavity and a measuring assembly, the driving assembly and the to-be-measured sample accommodating cavity are respectively arranged at two ends of the measuring rod main body; the rotating part and the rotary part of the to-be-tested sample accommodating cavity are oppositely arranged on the supporting shell, the sample table realizes angle rotation through the rotating part, and meanwhile, the sample table realizes rotary returning through the rotary part; the driving assembly is connected with the rotating part through the transmission assembly and drives the transmission assembly to move in the direction parallel to the axis of the measuring rod main body so as to drive the to-be-measured sample to realize angle rotation; the measuring assembly comprises an angle acquisition module for acquiring the angle change of the to-be-measured sample and a data acquisition module for acquiring anisotropic data of the to-be-measured sample. The device is simple in structure, and high-precision electric transmission operation angle measurement of the sample can be carried out in a low-temperature strong magnetic field extreme environment of the water-cooled magnet.

Description

Technical Field

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

[0002] As one of the national large-scale scientific facilities, water-cooled magnets can provide special experimental conditions with strong magnetic fields and extremely low temperatures far exceeding those of ordinary superconducting magnets. They are one of the important experimental facilities in condensed matter physics. The anisotropy of materials means that many materials exhibit different properties in different directions. The measurement of material anisotropy is very important both for its application and for the study of the principles of some 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 intends to propose a low-temperature electric transmission operating angle measuring rod that can adapt to the low-temperature and strong magnetic field environment of a water-cooled magnet and has a simple structure, convenient operation, and accurate measurement. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a device for measuring the low-temperature electric transmission angle of a water-cooled magnet, which at least solves the problem that the prior art cannot cope with the electric transmission angle measurement of samples in water-cooled magnets.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A water-cooled magnet low-temperature electric transmission running angle measuring device, the device comprising: A driving assembly, a transmission assembly, a measuring rod body, a sample holding chamber to be measured, and a measuring assembly; The driving assembly and the sample holding chamber to be tested are respectively arranged at two ends of the measuring rod body; The sample holding chamber to be tested comprises a sample stage, a rotating part, a swivel part, and a supporting shell; the rotating part and the swivel part are arranged oppositely on both sides of the sample stage; the sample stage realizes angular rotation through the rotating part, and the sample stage realizes swivel return to its original position through the swivel part; The driving assembly is connected to the rotating part through the transmission assembly, and the driving assembly drives the transmission assembly to move along a direction parallel to the axis of the measuring rod body; 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.

[0007] In one embodiment, the transmission assembly includes a lead screw, a lead screw nut, and a transmission rod; 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 arranged on the screw rod nut, and the other end is connected to the rotating part.

[0008] Preferably, the driving component is a stepping motor or a rotating hand wheel; and the screw is a ball screw.

[0009] In one embodiment, the transmission assembly further comprises 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.

[0010] Preferably, there are two guide rods, which are arranged on both sides of the screw rod.

[0011] More preferably, the guide rod is a smooth steel tube.

[0012] 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 a sample to be measured.

[0013] In another embodiment, the angle acquisition module includes a sliding rheostat, a sliding piece of the sliding rheostat is arranged on the transmission assembly, and a resistance change of the sliding rheostat is equivalent to an angle change of the sample to be tested.

[0014] Preferably, the sliding piece of the sliding rheostat is fixed on the lead screw nut.

[0015] In one embodiment, the rotating part includes a wire rotating wheel, and the wire rotating wheel is embedded in a through hole opened on the side wall of the supporting shell.

[0016] Preferably, the transmission rod is connected to the rotating part via a steel wire.

[0017] In one embodiment, the rotating part includes a rotating wheel, and the rotating wheel is embedded in another through hole opened on the side wall of the supporting shell, and the other through hole is arranged opposite to the through hole embedded in the rotating part.

[0018] Preferably, a scroll spring is installed on the rotating wheel, and the scroll spring provides a rotating force for the rotating wheel.

[0019] In one embodiment, the device further comprises: a heat radiation screen, wherein the heat radiation screen is sleeved on the measuring rod body.

[0020] 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 opened on the shell bottom, and a protrusion adapted to the groove is opened on the shell cover.

[0021] More preferably, an "O" ring is embedded in the groove.

[0022] In one embodiment, the transmission rod and the measuring rod body have the same wall thickness and / or the same material.

[0023] In a preferred embodiment, a gasket is arranged 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.

[0024] More preferably, the gasket is a polytetrafluoroethylene gasket.

[0025] In one embodiment, one 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 and are electrically connected to the plurality of pin holes, each contact is independently electrically connected to a hole on a measuring instrument plug interface, and an external measuring instrument is electrically connected to the corresponding hole on the measuring instrument plug interface.

[0026] In a preferred embodiment, the sample to be tested is electrically connected to the sample stage via a sample holder.

[0027] In one embodiment, the measuring instrument plug interface is mounted on the housing.

[0028] Preferably, the measuring instrument plug interface is mounted on the housing via a mounting block.

[0029] (III) Beneficial effects The present invention provides a water-cooled magnet low-temperature electric transmission running angle measuring device. Compared with the prior art, it has the following beneficial effects: The present application proposes a water-cooled magnet low-temperature electric transmission running angle measuring device, which includes: a driving component, a transmission component, a measuring rod body, a sample holding chamber to be tested, and a measuring component; the driving component and the sample holding chamber to be tested are respectively arranged at both ends of the measuring rod body; the sample holding chamber to be tested includes a sample stage, a rotating part, a swivel part, and a supporting shell; the rotating part and the swivel part are arranged on both sides of the sample stage, and are oppositely arranged on the supporting shell, so that the sample stage can realize angle rotation through the rotating part, and at the same time, the sample stage can realize rotation and return to its original position through the swivel part; the driving component is connected to the rotating part through the transmission component, and the driving component drives the transmission component to move in a direction parallel to the axis of the measuring rod body; the measuring component includes an angle acquisition module for acquiring angle changes of the sample to be tested and a data acquisition module for acquiring anisotropic data of the sample to be tested. The device has a simple structure and can cope with the electric transmission running angle measurement of samples in water-cooled magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of a water-cooled magnet low-temperature electric transmission running angle measurement device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the sample holding chamber in an embodiment of the present invention; Figure 3 It is a 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; Figure 4 It is a schematic diagram of the structure of the transmission assembly and the shell bottom part in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the housing in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the rotating part (wire wheel) in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the rotating part (rotating wheel) in an embodiment of the present invention; Figure 8 An exploded view of the sample stage and sample holder related structures in an embodiment of the present invention; Fig. 9 is a schematic diagram of the sample stage structure at another viewing angle in an embodiment of the present invention; Fig.10 It is a schematic diagram of the structure of the heat radiation screen in the embodiment of the present invention; Fig.11This is a schematic diagram of the assembly of the housing cover and the measuring instrument plug interface in an embodiment of the present invention; In the figure: 1-driving assembly; 2-transmission assembly; 3-measuring rod body; 4-test sample holding chamber; 5-measuring assembly; 6-gasket; 7-thermal radiation screen; 8-integrated housing; 9-measuring instrument plug interface; 10-mounting block; 11-flange; 21-screw rod; 22-screw rod nut; 23-transmission rod; 24-guide rod; 41-sample stage; 42-rotating part; 43-swivel part; 44-support housing; 51- angle acquisition module; 81-shell bottom; 82-shell cover; 411-sample holder; 412-cylindrical protrusion; 811-groove; 821-protrusion. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In material research, the anisotropy of crystal materials has a great influence on transport properties. Anisotropy refers to the fact that all or part of the chemical, physical and other properties of a substance change with the change of direction, showing different properties in different directions. Transport refers to the movement of various energy-carrying particles caused by the internal inhomogeneity of the system or the modulation of the external field (temperature field, electric field, magnetic field). The gradient of various physical quantities represents the degree of this inhomogeneity, and the transport direction of the corresponding physical quantity tends to eliminate the inhomogeneity of the physical quantity until this inhomogeneity is eliminated, the transport process stops, and the system reaches equilibrium from the non-equilibrium state.

[0034] As one of the national large-scale scientific facilities, water-cooled magnets can provide special experimental conditions with strong magnetic fields and extremely low temperatures far exceeding those of ordinary superconducting magnets. The measurement of material anisotropy is very important both for its application and for the study of the principles of some physical phenomena.

[0035] However, in the extreme environment of low temperature and strong magnetic field of water-cooled magnets, the existing commercial gear transmission measuring rod cannot work properly. Based on this, it is urgent to propose a low-temperature electric transmission running angle measuring rod that can adapt to the extreme environment of low temperature and strong magnetic field of water-cooled magnets, and has a simple structure, convenient operation and accurate measurement.

[0036] The present application provides a device for measuring the low-temperature electric transport angle of a water-cooled magnet, which at least solves the problem that the prior art is unable to cope with the measurement of the electric transport angle of a sample to be tested in a water-cooled magnet, and achieves the purpose of measuring the electric transport properties of a sample to be tested in a strong magnetic field and low-temperature environment of a water-cooled magnet by a simple device.

[0037] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows: 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, so 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.) to cooperate with a transmission component (such as a screw, etc.) to pull the sample stage to rotate, drive 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 thereon), thereby indirectly changing the direction of the magnetic field passing through the sample to be tested.

[0038] 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, and the measuring device is taken out every time it rotates an angle to measure the rotation angle of the sample to be tested, which is a cumbersome, time-consuming and laborious 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 with the rotation of the lead screw, and the sample stage below will rotate synchronously by a certain angle, and the resistance value of the sliding rheostat will also change accordingly.

[0039] However, although it is known that the change in the resistance of the sliding rheostat represents the rotation of the sample stage, it is not clear that there is a one-to-one correspondence between the resistance of the sliding rheostat and the rotation angle of the sample stage. Based on this, the present application pre-calculates the distance that the corresponding lead screw nut moves up and down when the sample stage rotates one circle, and the change in the resistance of the sliding rheostat when the sample stage rotates one circle. By calculation, the relationship between the distance that the motor drives the lead screw nut (or lead screw) to move and the rotation angle of the sample stage can be obtained, so as to achieve angle magnification (for example, 1° of sample stage rotation is equivalent to tens or even hundreds of degrees of lead screw rotation, and 1° of sample stage rotation is equivalent to the change in resistance of the sliding rheostat).

[0040] 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 change in resistance 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 is obtained, and then the linear relationship between the number of turns driven by the stepper motor and the rotation angle of the sample stage is obtained. After the calibration is completed, the Hall plate can be removed.

[0041] The technical solution in the embodiment of the present application is based on the above principle. The proposed water-cooled magnet low-temperature electric transmission running angle measuring device is driven by a stepper motor (or hand wheel) and combined with the transmission of a high-precision ball screw to achieve precise power drive in a strong magnetic field and low temperature environment. Then, the precise power is used to drive the sample stage and the sample to be tested placed on the sample stage to rotate a certain angle, and then cooperate with the sliding rheostat to achieve high-precision angle reading, so as to achieve the electric transmission running angle measurement of the sample to be tested in the extreme environment of a water-cooled magnet low temperature and strong magnetic field. In addition, the device also uses a rotating wheel equipped with a scroll spring to provide continuous rotation force for the rotation return of the sample stage and the sample to be tested, thereby improving the stability of the sample stage.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Due to the special structure of the water-cooled magnet, its sample cavity is an extremely thin 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 running angle measurement device proposed in the embodiment of the present application is also roughly in the shape of a long strip, such as Figure 1 shown.

[0044] See also Figure 1 The present embodiment proposes a water-cooled magnet low-temperature electric transmission running angle measuring device, which mainly includes: a driving component 1 (not shown in the figure), a transmission component 2, a measuring rod body 3, a sample holding chamber 4, and a measuring component 5.

[0045] The driving component 1 and the sample holding chamber 4 are respectively arranged at the two ends of the measuring rod body 3. The driving component 1 provides power for the angular rotation of the sample to be tested, and the sample holding chamber 4 is used to hold the sample to be tested, and the sample to be tested realizes angular rotation and rotation return inside the sample holding chamber 4. It should be noted that in some preferred embodiments, the driving component 1 is placed above the measuring rod body 3, and does not enter the water-cooled magnet with the sample to be tested, so as to avoid the influence of the low temperature and strong magnetic field on the drive of the transmission component 2.

[0046] like Figure 2 and Figure 3 As shown, the sample holding chamber 4 includes a sample stage 41, a rotating part 42, a swivel part 43, and a supporting shell 44. The sample stage 41 is used to place the sample to be tested, and the rotating part 42 and the swivel part 43 can be rotatably arranged on the supporting shell 44, and the rotating part 42 and the swivel part 43 are arranged in a row and opposite to each other on both sides of the sample stage 41, and the two opposite and close sides are fixedly connected to the sample stage 41, so that the sample stage 41 can realize angular rotation through the rotating part 42 on the one hand, and the sample stage 41 can realize rotation and return to its original position through the swivel part 43 on the other hand. In specific implementation, the sample stage 41 is fixedly connected to the rotating part 42 and the swivel part 43 by low-temperature glue.

[0047] like Figure 1 , Figure 2 As shown, the driving component 1 is connected to the rotating part 42 through the transmission component 2. When the driving component 1 drives the transmission component 2, the transmission component 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.

[0048] The measuring component 5 (corresponding to the position shown by the angle acquisition module 51 in the figure, the angle acquisition module 51 is a part of the measuring component 5) is used to measure the angle change of the sample to be tested after rotation and the anisotropy data of the sample to be tested when the angle changes. It mainly includes the angle acquisition module 51 for collecting the angle change of the sample to be tested, and the data acquisition module (not shown in the figure) for collecting the anisotropy data generated by the angle change of the sample to be tested. In a preferred embodiment, the data acquisition module includes but is not limited to a thermometer, etc. The thermometer is set on or near the sample to be tested, and is used to collect the temperature value and temperature change of the sample to be tested in the high field.

[0049] In one embodiment, the angle acquisition module 51 includes but is not limited to a Hall plate. The resistance of the Hall plate changes sinusoidally according to the direction of the magnetic field, so the rotation angle of the sample to be tested can be calculated by detecting the change in the resistance of the Hall plate. In a specific implementation, the Hall plate is set on the sample stage so that its angle change is consistent with the angle change of the sample to be tested.

[0050] However, the nonlinear nature of the sinusoidal curve speed will lead to unstable accuracy when using the change in the Hall plate resistance to read the sample rotation angle, and the Hall plate will occupy the measurement channel. The Hall plate requires a magnetic field, but some samples do not need or cannot be added with a magnetic field during measurement. Based on this: 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. The 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 a resistance wire coil is arranged at a position parallel to the screw rod 21 near the screw rod 21. The slider slides on the patch or the resistance wire coil as the screw nut 22 moves, thereby changing the size of the resistance of the access 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 calculated and calibrated in advance, so the rotation angle of the sample to be tested can be judged according to 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, so that the influence of the low temperature strong magnetic field on the angle reading of the sliding rheostat can be avoided.

[0051] 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 1 through a bearing, and the other end of the screw 21 is connected to the output shaft of the driving assembly 1. When the driving assembly 1 is working, the screw 21 rotates, and the screw nut 22 moves along the screw 21 toward the driving assembly 1, driving the transmission rod 23 to move along the axial direction parallel to the screw 21 toward the driving assembly 1, and 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.

[0052] In a preferred embodiment, in order to achieve high-precision displacement control, the screw 21 is a ball screw. Through the cooperation of a small-diameter, small-lead ball screw and a screw nut 22, high-precision position movement and stroke control can be achieved along a direction parallel to the axis of the screw 21.

[0053] In a preferred embodiment, the driving component 1 is a stepper motor or a rotating handwheel. Precise power driving under high field is achieved through the stepper motor or the rotating handwheel. More preferably, the stepper motor is a 42 stepper motor.

[0054] The ball screw is matched with the stepper motor or the rotating handwheel, and can achieve precise power driving under high field and high-precision displacement and stroke control.

[0055] In one embodiment, the transmission component 2 further includes a guide rod 24. The guide rod 24 is used to guide the movement of the lead screw nut 22, ensuring that the moving direction of the lead screw nut 22 can be completely along the direction parallel to the axis of the measuring rod body 3. During specific implementation, as Figure 4 and Figure 5 shown, a small hole is provided in the lead screw nut 22 for the guide rod 24 to pass through and is slidably connected to the lead screw nut 22. The opening direction of the small hole is completely parallel to the direction of the axis of the measuring rod body 3, so that the guide rod 24 is parallel to the measuring rod body 3. When the lead screw nut 22 is driven by the driving component 1 to move, the moving direction will be 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.

[0056] Preferably, there are two guide rods 24, which are arranged on both sides of the lead screw 21. More preferably, the guide rod 24 is a smooth steel pipe.

[0057] In one embodiment, the rotating part 42 includes but is not limited to a wire wheel. The structure of the wire wheel is as Figure 6 shown. The wire wheel is embedded in the through hole opened on the side wall of the support housing 44, and the wire wheel is rotatably connected to the inner side wall of the support housing 44. When the rotating part 42 includes a wire wheel, a part of the transmission rod 23 connecting the rotating part 42 is preferably a steel wire. That is, the part of the columnar metal transmission rod 23 between the sample chamber 4 to be measured and the lead screw nut 22 is a columnar metal transmission rod 23, and a steel wire is selected between the columnar metal transmission rod 23 and the wire wheel. 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 chamber 4 to be measured through the wire hole opened on the sample chamber 4 to be measured and is fixedly connected to the small hole reserved on the wire wheel. When the lead screw nut 22 moves, the transmission rod 23 moves, driving the steel wire to move, and further driving and controlling the movement of the wire wheel. The rotation of the wire wheel will further drive the sample stage 41 and the sample to be measured on the sample stage 41 to rotate.

[0058] In one embodiment, the slewing part 43 includes but is not limited to a slewing wheel. The structure of the slewing wheel is as Figure 7The rotary wheel is embedded in another through hole opened on the side wall of the supporting shell 44, and the through hole is arranged opposite to the through hole of the embedded rotating part 42. At the same time, the rotary wheel is also rotatably connected to the inner side wall of the supporting shell 44. In addition, a scroll spring is installed on the rotary wheel to provide continuous rotation force for the rotary wheel. The sample stage 41 and the sample to be tested thereon are controlled to rotate and return to their original positions through the deformation and return of the scroll spring.

[0059] Preferably, when the rotating wheel and the wire rotating wheel are respectively embedded in the through hole opened on the side wall of the sample chamber, a gasket 6 is arranged between the outer side of the rotating wheel and the wire rotating wheel rim and the inner side of the supporting shell 44 at the through hole to reduce the friction between the rotating wheel and the wire rotating wheel and the through hole wall. Figure 2 shown.

[0060] More preferably, the gasket 6 is a polytetrafluoroethylene gasket.

[0061] 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 one by one, 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.), and the measuring instrument plug interface 9 is as shown in FIG. Fig.11 As shown. In a 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.

[0062] 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 achieve different measurement needs, the sample to be tested is detachably and electrically connected to the sample stage 41 through a sample holder 411 arranged on the upper surface of the sample stage 41. Specifically, one side of the sample holder 411 is provided with pins corresponding to a plurality of pin holes on the sample stage 41, and on the other side of the sample holder 411, a plurality of copper disks are provided corresponding to and 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 through wires according to actual measurement needs. Then, the sample holder 411 connected with the sample to be tested is plugged into the sample stage 41, and the sample to be tested can be connected to an external current source, a measuring instrument, etc. through the hole on the measuring instrument plug interface 9 to achieve 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, which 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.

[0063] like Figure 8 and Fig. 9 As shown, in a further preferred embodiment, a cylindrical protrusion 412 is fixedly connected below the sample stage 41, which is used to wrap a heating wire to heat the sample to be tested. The heating wire can ensure stable temperature control of the sample to be tested. A cylindrical block is preferably provided at the bottom of the cylindrical protrusion 412 to prevent the heating wire from falling off.

[0064] like Figure 1 , Figure 5 , Fig.10 As shown, in a preferred embodiment, the measuring device further includes a plurality of thermal radiation screens 7, which are sleeved on the measuring rod body 3 and the transmission rod 23. On the one hand, the thermal radiation screen 7 can be used to block thermal radiation, and on the other hand, the thermal radiation screen 7 can limit the transmission direction of the transmission rod 23. In specific implementation, a hole of the size and shape of the outer diameter of the measuring rod body 3 and the transmission rod 23 is opened on the thermal radiation screen 7, and then the measuring rod body 3 and the transmission rod 23 are sequentially passed through the holes set on the plurality of thermal radiation screens 7 to achieve the installation of the thermal radiation screen 7. More preferably, four thermal radiation screens 7 are arranged at equal intervals along the extension direction of the measuring rod body 3.

[0065] In a further preferred embodiment, the transmission rod 23 is made of a stainless steel tube with 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 change caused by the thermal expansion and contraction of the measuring rod body 3 when the temperature changes.

[0066] like Figure 1As shown, in one embodiment, the above device further includes an integrated housing 8, which is disposed at one end of the measuring rod body 3 close to the driving assembly 1, and encloses the driving assembly 1 and part of the transmission assembly 2 therein.

[0067] 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 .

[0068] See also Figure 1 , Figure 4 , Figure 5 ,as well as Fig.11 As shown, in a preferred embodiment, the integrated housing 8 includes two parts: a housing bottom 81 and a housing cover 82. Among them, one end of the screw 21 connected to the output shaft of the driving component 1 passes through the housing bottom 81 in sequence, passes through the through hole opened at the top of the housing cover 82, and extends to the outside of the housing to be connected to the output shaft of the driving component 1. The screw nut 22, the guide rod 24, and the sliding rheostat are wrapped inside the housing cover 82.

[0069] In order to ensure the airtightness 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 place where the groove 811 and the protrusion 821 contact for sealing. When the protrusion 821 contacts the groove 811 and is pressed, the "O" ring is squeezed and deformed to form a seal. For details, please refer to Figure 4 and Figure 5 .

[0070] In addition, 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 through the flange 11. When the measuring rod body 3 extends into the water-cooled magnet, the flange 11 is used to achieve sealing and isolate the internal and external environments of the water-cooled magnet.

[0071] More preferably, the flange 11 is a KF40 flange.

[0072] See also Fig.11 In another preferred embodiment, the measuring instrument plug interface 9 mentioned above can be installed at a suitable position on the shell cover 82 according to actual needs. Fig.11 As shown, in one embodiment, there are three measuring instrument plug-in ports 9, one of the two measuring instrument plug-in ports 9 on the left is a plug-in port for connecting a thermometer and a heater, the other is a plug-in port for connecting a sliding rheostat, and the rightmost plug-in port is used to measure the anisotropy data of the sample to be tested.

[0073] In one embodiment, the measuring instrument plug-in port 9 is mounted on the shell cover 82 through the mounting block 10. Specifically, a through hole is provided on the shell cover 82, and screw holes are symmetrically reserved near the through hole. 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 where the mounting block 10 contacts the shell cover 82, and an "O" ring is embedded in the groove. When the mounting block 10 is fastened to the shell cover 82 by screws, the "O" ring is squeezed and deformed to ensure sealing. Further, a small hole for the measuring instrument plug-in port 9 to pass through is provided on the mounting block 10, so that the measuring instrument plug-in port 9 passes through the small hole and is connected to the mounting block 10, and then is installed on the shell cover 82. Similarly, in order 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, and further a better seal is ensured by the squeezing and deformation of the "O" ring.

[0074] The measurement principle and use process of a water-cooled magnet low-temperature electric transmission running angle measurement device proposed in this embodiment are as follows: The stepper motor (or hand wheel) drives the ball screw to rotate, and then drives the screw nut 22 to move upward accurately. The movement of the screw nut 22 drives the transmission rod 23 connected to it to move upward, the wire line is routed, and then drives the wire wheel below to rotate, the sample stage 41, and the rotating wheel to rotate, and the scroll spring of the rotating wheel is tightened; when the screw nut moves downward, the transmission rod 23 moves downward, the wire line is routed, and the scroll spring is relaxed. The wire wheel, the sample stage 41, and the rotating wheel rotate.

[0075] The rotation of the sample stage 41 in the high field will drive the rotation of the sample to be tested thereon. The sliding rheostat can use the change in resistance to feedback the angle change of the sample to be tested. At the same time, the Hall plate, thermometer, etc. arranged 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 interface 9 and the measuring circuit, and then indirectly connected to the sample to be tested. The anisotropy of the sample to be tested in the high field can be measured by the external measuring instrument.

[0076] In summary, compared with the prior art, the present invention has the following beneficial effects: 1. The present application proposes a water-cooled magnet low-temperature electric transmission running angle measuring device, which includes: a driving component, a transmission component, a measuring rod body, a sample holding chamber to be tested, and a measuring component; the driving component and the sample holding chamber to be tested are respectively arranged at both ends of the measuring rod body; the sample holding chamber to be tested includes a sample stage, a rotating part, a swivel part, and a supporting shell; the rotating part and the swivel part are arranged oppositely on the supporting shell, and the sample stage realizes angle rotation through the rotating part, and at the same time, the sample stage realizes rotation and return to its original position through the swivel part; the driving component is connected to the rotating part through the transmission component, and the driving component drives the transmission component to move in a direction parallel to the axis of the measuring rod body; the measuring component includes an angle acquisition module for collecting angle changes of the sample to be tested and a data acquisition module for collecting anisotropic data of the sample to be tested. The device has a simple structure and can cope with the electric transmission running angle measurement of samples in extreme environments of low-temperature and strong magnetic fields of water-cooled magnets.

[0077] 2. The present application proposes a water-cooled magnet low-temperature electric transmission running angle measurement device, in which the driving component can select a stepper motor or a rotating hand wheel, which can realize the conversion between manual and automatic, and the driving is more flexible and accurate.

[0078] 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 hand wheel), and can achieve high-precision angle reading through cooperation with a sliding rheostat.

[0079] 4. The present application proposes a water-cooled magnet low-temperature electric transmission running 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 field on angle driving and reading.

[0080] 5. The present application proposes a water-cooled magnet low-temperature electric transmission running angle measurement device, which uses a transmission rod made of the same material as the main body of the measuring rod, thereby greatly reducing the transmission changes caused by thermal expansion and contraction when the temperature changes, making the measurement results more accurate.

[0081] 6. The present application proposes a water-cooled magnet low-temperature electric transmission running angle measuring device, which uses a scroll spring to provide a continuous large rotation force for the rotating part, and has a simple and compact structure. Under conditions such as magnet vibration and low temperature, the angle of the sample stage can still be guaranteed to be stable and the return difference can be greatly reduced.

[0082] 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 any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0083] 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 embodiments of the present invention.

Claims

1. A water-cooled magnet low-temperature electric transmission running angle measuring device, characterized in that: The device comprises: a driving component (1), a transmission component (2), a measuring rod body (3), a sample receiving chamber (4), and a measuring component (5); The driving assembly (1) and the sample holding chamber (4) are respectively arranged at two ends of the measuring rod body (3); The sample holding chamber (4) comprises a sample stage (41), a rotating part (42), a swivel part (43), and a supporting shell (44); the rotating part (42) and the swivel part (43) are arranged oppositely on two sides of the sample stage (41); the sample stage (41) is angularly rotated by the rotating part (42), and the sample stage (41) is swivel-returned by the swivel part (43); The driving component (1) is connected to the rotating part (42) via the transmission component (2), and the driving component (1) drives the transmission component (2) to move along 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.

2. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 1, characterized in that: The transmission assembly (2) comprises a screw (21), a screw nut (22), and a transmission rod (23); The output shaft of the driving assembly (1) is connected to the screw rod (21), the screw rod nut (22) is sleeved on the screw rod (21) and movably connected to the screw rod (21), and one end of the transmission rod (23) is arranged on the screw rod nut (22) and the other end is connected to the rotating part (42).

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

4. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 1, characterized in that: The angle acquisition module (51) comprises a Hall plate, and when the Hall plate is arranged on the sample stage (41), an angle change of the Hall plate is equivalent to an angle change of the sample to be measured; or The angle acquisition module (51) comprises a sliding rheostat, a sliding piece of which 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.

5. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 1, characterized in that: The rotating part (42) comprises a wire rotating wheel, and the wire rotating wheel is embedded in a through hole opened on the side wall of the supporting shell (44).

6. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 1, characterized in that: The rotating part (43) comprises a rotating wheel, and the rotating wheel 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 part (42).

7. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 6, characterized in that: A scroll spring is installed on the rotating wheel, and the scroll spring provides a rotating force for the rotating wheel.

8. The water-cooled magnet low-temperature electric transmission running angle measuring device according to any one of claims 1 to 7, 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).

9. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 8, 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 (1); The shell bottom (81) is provided with a groove, and the shell cover (82) is provided with a protrusion adapted to the groove.

10. The water-cooled magnet low-temperature electric transmission running angle measuring device according to claim 2, 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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