A cradle type low temperature sample holder and a low temperature experimental apparatus

Abstract

The application provides a cradle type low-temperature sample holder and low-temperature experimental equipment, which comprises a sample mounting frame arranged in an experimental vacuum chamber, a sample connecting table rotatably arranged on the sample mounting frame and used for mounting a sample to be tested and a sensor, a return elastic member with one end fixed and the other end connected to the sample connecting table, and a control cable with one end connected to the sample connecting table and the other end used for connecting an external control device; the sample connecting table is adjusted in an angle of upward inclination and downward inclination through the pulling force of the control cable and the elastic force of the return elastic member. The problem that the sample connecting table cannot rotate and work due to the failure of electric components in the prior art in a low-temperature vacuum experimental chamber is solved.

Description

Technical Field

[0001] This application relates to the field of low-temperature experimental equipment technology, and in particular to a cradle-type low-temperature sample rack and low-temperature experimental equipment. Background Technology

[0002] In the experimental vacuum chamber of cryogenic equipment, a sample holder is required to carry out various low-temperature (1-10K) and ultra-low-temperature (0.01-0.1K) characteristic tests. In some experiments, it is necessary to allow the sample in the sample holder to rotate or change its orientation to adapt to various changes in magnetic field direction or adjustment of optical ray angle in the characteristic follower experiment.

[0003] At room temperature, the electric components are directly installed inside the experimental chamber to drive the sample holder. However, in the experimental chambers of these low-temperature or ultra-low-temperature devices, the temperature is often as low as 1-10K or even 0.01-0.1K. At such low temperatures, all electric components or electric drive devices will fail due to the excessively low temperature, causing the electronic devices to malfunction and become inoperable.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a cradle-type low-temperature sample holder and a low-temperature experimental device, which solves the problem in the prior art that the sample connection stage cannot rotate due to the failure of electric components in the low-temperature vacuum experimental chamber.

[0006] On the one hand, this application provides a cradle-type cryogenic sample rack, comprising:

[0007] Sample mounting bracket, which is used to be placed inside the experimental vacuum chamber;

[0008] The sample connection stage is rotatably mounted on the sample mounting frame and is used to mount the sample to be tested and the sensor.

[0009] The return elastic element is fixed at one end and connected to the sample connection stage at the other end.

[0010] The control cable has one end connected to the sample connection platform and the other end used to connect to external control equipment.

[0011] The sample connection platform adjusts its tilting angle by controlling the tension of the steel cable and the elastic force of the return elastic element.

[0012] Optionally, a first rotating wheel and a second rotating wheel are respectively provided on both sides of the sample connection stage, and both the first rotating wheel and the second rotating wheel are rotatably connected to the sample mounting frame through a rotating shaft;

[0013] The control cable is connected to the first rotating wheel, and the return elastic element is connected to the second rotating wheel.

[0014] Optionally, the connection between the control cable and the first rotating wheel forms a first connection position, and the connection between the return elastic element and the second rotating wheel forms a second connection position. The first connection position and the second connection position are located on both sides of the rotation center of the sample connection stage, respectively.

[0015] Optionally, the sample mounting rack has an experimental chamber, and the sample connecting stage is rotatably mounted inside the experimental chamber;

[0016] The sample mounting rack has multiple slots that connect to the experimental chamber. The return elastic element and the control cable extend to the outside of the experimental chamber through the slots.

[0017] Optionally, the return elastic element includes: a pull cable that extends through a slot into the experimental chamber and connects to the sample connection stage;

[0018] The spring section is integrated with the pulling steel cable and located on the outside of the experimental chamber.

[0019] Optionally, a flexible heat conduction rope connects the sample connection stage and the sample mounting frame.

[0020] Optionally, the flexible heat conduction rope is an oxygen-free copper rope.

[0021] Optionally, the top of the sample mounting rack is provided with a hollow hanging rod, which is used to run signal lines and wires.

[0022] A fixing plate is installed on the hollow hanger, and one end of the return elastic element is fixed on the fixing plate.

[0023] On the other hand, this application also proposes a low-temperature experimental device, including: a low-temperature vacuum device body, on which a control device is provided;

[0024] And as described above, a cradle-type low-temperature sample holder is installed inside the low-temperature vacuum equipment, and the control equipment is connected to a control cable.

[0025] Optionally, the control device includes: a manipulator, wherein the displacement rod of the manipulator is connected to a control cable.

[0026] Beneficial Effects: The cradle-type cryogenic sample holder and cryogenic experimental equipment disclosed in this application utilize a sample connecting platform rotatably mounted on a sample mounting frame. This rotation is achieved through the tension of a control cable and the elasticity of a return elastic element. During rotation, the sample connecting platform, carrying the sample to be tested, adjusts its tilting angle, thus forming a cradle-type cryogenic sample holder structure with the control cable and return elastic element. This results in flexible, accurate, simple, and highly reliable rotation and adjustment of the sample connecting platform. Because it uses a simple return elastic element and control cable as the most basic actuating components, instead of employing electric components directly mounted on the sample holder within the cryogenic vacuum experimental chamber, it avoids the problem of easily damaged electric components and the inability to stably drive the sample. Furthermore, the structure of this cradle-type cryogenic sample holder avoids transmission errors caused by complex structures and transmission mechanisms. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a cradle-type low-temperature sample holder according to an embodiment of this application;

[0028] Figure 2 This is a front view of a cradle-type low-temperature sample holder according to an embodiment of this application.

[0029] In the diagram: 100, sample mounting rack; 110, experimental chamber; 120, slot; 130, flexible heat conduction rope; 140, hollow hanging rod; 141, fixing plate; 200, sample connecting platform; 210, first rotating wheel; 211, winding groove; 220, second rotating wheel; 230, rotating shaft; 240, sensor; 250, sample to be tested; 300, return elastic element; 310, pulling steel cable; 320, spring section; 400, control steel cable. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0031] In low-temperature environments, electric components or electric drive devices typically fail to function properly. If a power component is installed at room temperature and the power is transmitted to a sample holder in a low-temperature environment via a mechanical structure to achieve sample rotation or oscillation, then a mechanical transmission device such as a gear or screw is required. However, such meshing mechanical transmission devices experience changes in the mechanical properties of the metal materials in low-temperature environments, as well as transmission deviations caused by material shrinkage. During operation, it is difficult to guarantee the stability of the meshing transmission, easily leading to poor transmission reliability. Furthermore, in vacuum experiments, the surfaces of the metal parts come into contact with each other during the meshing transmission process. Without lubrication, wear is highly likely, and the resulting metal dust can contaminate the vacuum experimental chamber. Therefore, to solve the above problems, this application proposes the following embodiments, as detailed below:

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment proposes a cradle-type low-temperature sample holder, mainly comprising: a sample mounting frame 100, a sample connecting platform 200, a return elastic element 300, and a control cable 400. The sample mounting frame 100 is used to be placed inside an experimental vacuum chamber. The sample connecting platform 200 is rotatably mounted on the sample mounting frame 100 and is used to mount the sample to be tested 250 and the sensor 240; thus, the sample can be tested within the experimental vacuum chamber. The return elastic element 300 can be a stainless steel spring, possessing elasticity. One end of the return elastic element 300 is fixed at a height position, and the other end is connected to the sample connecting platform 200. The control cable 400 can be a stainless steel cable, with one end connected to the sample connecting platform 200 and the other end used to connect to external control equipment. The sample connecting platform 200 can be adjusted in tilting up and down by the tension of the control cable 400 and the elasticity of the return elastic element 300. When the control cable 400 is pulled by the external control device, it causes the sample connecting platform 200 to rotate upwards by a certain angle. During the upward rotation, the sample connecting platform 200 drives the return elastic element 300, causing the return elastic element 300 to generate elastic force. When the external control device releases the control cable 400, the sample connecting platform 200 rotates downwards by a certain angle under the action of the return elastic element 300, thereby adjusting the angle of the sample 250 to be tested on the sample connecting platform 200 to be tilted up or down.

[0034] like Figure 1As shown, the cradle-type cryogenic sample holder in this embodiment rotates a sample connecting platform 200 on the sample mounting frame 100. This rotation is achieved through the tension of the control cable 400 and the elasticity of the return elastic element 300. During rotation, the sample connecting platform 200, carrying the sample 250 to be tested, adjusts its angle by tilting up and down. This creates a cradle-type cryogenic sample holder structure with the sample connecting platform 200, the return elastic element 300, and the control cable 400. This makes the rotation adjustment of the sample connecting platform 200 flexible, accurate, structurally simple, and highly reliable. Because the simple return elastic element 300 and control cable 400 are used as the basic actuators, instead of using electric components directly mounted on the sample holder inside the cryogenic vacuum chamber, the problem of easily damaged electric components and unstable sample driving is avoided. Furthermore, the structure of this cradle-type cryogenic sample holder avoids transmission errors caused by complex structures and transmission mechanisms.

[0035] like Figure 1 , Figure 2 As shown, in this embodiment, a first rotating wheel 210 and a second rotating wheel 220 are respectively provided on both sides of the sample connecting platform 200. Both the first rotating wheel 210 and the second rotating wheel 220 are rotatably connected to the sample mounting frame 100 via a rotating shaft 230. In the specific structure, the rotating shaft 230 is fixedly connected to the left side of the sample connecting platform 200, and the rotating shaft 230 is fixedly connected to the first rotating wheel 210. The leftmost side of the rotating shaft 230 rotatably passes through the sample mounting frame 100. Similarly, the second rotating wheel 220 is connected to the right side of the sample connecting platform 200 in the same manner. The control cable 400 is connected to the first rotating wheel 210, and the return elastic element 300 is connected to the second rotating wheel 220. By setting the first rotating wheel 210 and the second rotating wheel 220, the upward and downward directions of the control cable 400 and the return elastic element 300 can be limited, so that the control cable 400 and the return elastic element 300 move up and down along a predetermined trajectory. During the movement, they come into contact with the surface of the rotating wheel. The surface of the rotating wheel is arc-shaped, which makes the docking with the control cable 400 and the return elastic element 300 more stable. No additional lubrication is required during the smooth transition, ensuring a clean environment for the entire experimental vacuum chamber.

[0036] In this embodiment, both the first rotating wheel 210 and the second rotating wheel 220 are provided with winding grooves 211 on their outer circumferences. During the angle adjustment of the sample connection stage 200, the control cable 400 can deform and bend, thereby being pulled up or moved down along the winding groove 211 of the first rotating wheel 210. The winding groove 211 provides a limit, ensuring that the movement trajectories of the control cable 400 and the return elastic element 300 are on a straight line, making it less likely to rub against other parts and less likely to cause wear, thus avoiding the pollution of the vacuum experimental environment by wear dust.

[0037] like Figure 1 As shown, in this embodiment, the connection between the control cable 400 and the first rotating wheel 210 forms a first connection position, and the connection between the return elastic element 300 and the second rotating wheel 220 forms a second connection position. The first and second connection positions are located on opposite sides of the rotation center of the sample connection stage 200, respectively. Both the first and second connection positions can be set in the winding groove 211, with the axis of the rotating shaft as the rotation center. The rotating shaft can be set at the center position in the front-rear direction of the sample connection stage 200. The side of the sample connection stage 200 used for placing the sample can be the front side, while the side of the sample connection stage 200 used for mounting the sensor 240 can be the rear side. The control cable 400 is connected to the front side of the first rotating wheel 210, and the return elastic element 300 is connected to the rear side of the second rotating wheel 220, so that the control cable 400 and the return elastic element 300 on the front and rear sides move in opposite directions. For example, when the control cable 400 is pulled upward, the return elastic element 300 is pulled downward by the rotation of the second rotating wheel 220, so as to achieve the up and down swing control of the sample connection stage 200 with a more labor-saving structure.

[0038] Furthermore, in this embodiment, the sample mounting rack 100 has an experimental chamber 110, and the sample connecting platform 200 is rotatably mounted inside the experimental chamber 110. A through-hole is provided on the front side of the experimental chamber 110, allowing samples to be easily placed on the sample connecting platform 200. The sample mounting rack 100 has multiple slots 120 that communicate with the experimental chamber 110. The return elastic element 300 and the control cable 400 extend to the outside of the experimental chamber 110 through the slots 120. The slot 120 is used to allow the return elastic element 300 and the control cable 400 to avoid the sample mounting frame 100. By using the first rotating wheel 210 and the second rotating wheel 220 to limit the vertical movement trajectory of the control cable 400 and the return elastic element 300 respectively, the control cable 400 and the return elastic element 300 can move vertically up and down during the swing of the control sample connecting platform 200. By using the slot 120 to avoid the vertical movement of the control cable 400 and the return elastic element 300, the control cable 400 and the return elastic element 300 do not come into contact with the sample mounting frame 100 and other components, thus reducing wear and preventing wear dust from contaminating the vacuum experimental environment.

[0039] like Figure 1 , Figure 2As shown, further, the return elastic element 300 in this embodiment includes a pulling steel cable 310 and a spring segment 320. The pulling steel cable 310 extends into the experimental chamber 110 through the slot 120 and connects to the sample connection stage 200. The spring segment 320 is integrally formed with the pulling steel cable 310 and located on the outside of the experimental chamber 110. The spring segment 320 is elastic due to deformation. Therefore, by placing the spring segment 320 outside the experimental chamber 110, the space occupied by the spring segment 320 in the experimental chamber 110 is avoided, making the structural space utilization more reasonable. The pulling steel cable 310 and the spring segment 320 can be integrally formed. The pulling steel cable 310 will undergo a certain deformation when wrapped around the outer circumference of the second rotating wheel 220, and can recover when it is separated from the outer circumference of the second rotating wheel 220.

[0040] By controlling the steel cable 400 and the return elastic element 300 to interact with the first rotating wheel 210 and the second rotating wheel 220 respectively, the sample connecting stage 200 can be oscillated up and down to allow for testing of the sample at different angles. During the transmission process, in the low-temperature environment of the vacuum chamber, no electric components or electric drive devices are required for power drive, ensuring the stability of the angle adjustment process. Furthermore, the transmission process avoids meshing transmission methods; the steel cable 400 and the return elastic element 300 typically do not exhibit transmission deviations in the low-temperature environment, ensuring excellent transmission stability and making the experimental process more reliable. In addition, this embodiment is less prone to wear in a vacuum environment, avoiding contamination of the vacuum experimental chamber by wear metal powder.

[0041] like Figure 1 , Figure 2 As shown, in this embodiment, a flexible heat conduction rope 130 is connected between the sample connection stage 200 and the sample mounting frame 100. During the rotation of the sample connection stage 200, the flexible heat conduction rope 130 can deform with the rotation, and cold energy can be conducted through the flexible heat conduction rope 130. No matter how the sample connection stage 200 swings and changes angle, the flexible heat conduction rope 130 conducts cold energy, so that the sample temperature on the sample mounting stage is always consistent with the temperature of the sample mounting frame 100.

[0042] Furthermore, in this embodiment, the flexible heat conduction rope 130 is an oxygen-free copper rope. Oxygen-free copper rope has excellent heat conduction effect and is not prone to changes in mechanical properties in low-temperature environments, while still maintaining good flexibility.

[0043] Furthermore, a hollow suspension rod 140 is provided at the top of the sample mounting rack 100. The hollow suspension rod 140 is used to pass signal lines and wires. The hollow suspension rod 140 is a hollow stainless steel tube, allowing all signal lines and other wires to pass through it and enter the inner side of the sample mounting rack 100. A fixing plate 141 is provided on the hollow suspension rod 140, and one end of the return elastic element 300 is fixed to the fixing plate 141. There is a certain distance between the fixing plate 141 and the sample mounting rack 100, providing sufficient space for the spring segment 320 of the return elastic element 300 to deform sufficiently.

[0044] Example 2

[0045] This embodiment proposes a low-temperature experimental device, including: a low-temperature vacuum device body and a cradle-type low-temperature sample rack as described in Embodiment 1 above. The low-temperature vacuum device body is equipped with a control device; the cradle-type low-temperature sample rack is disposed inside the low-temperature vacuum device body, and the control device is connected to a control cable.

[0046] Furthermore, the control equipment includes: a manipulator, and a displacement rod of the manipulator connected to a control cable.

[0047] The working process of this embodiment is as follows:

[0048] First, the sample is mounted on the sample connection stage 200 of the sample mounting frame 100 at room temperature. Then, the signal transmission lines, heat conduction ropes, and wires of the sensor 240 and temperature control heater are connected. The entire sample mounting frame 100 and hollow suspension rod 140 are then inserted into the experimental vacuum chamber of the cryogenic vacuum equipment body through the sealing cap. The upper end of the hollow suspension rod 140 controls the horizontal rotation of the entire sample mounting frame 100 and establishes a tight seal between the hollow suspension rod 140 and the sealing cap. Simultaneously, all signal lines and wires can pass through the hollow suspension rod 140 and, via pre-made connectors, be introduced from the experimental vacuum chamber into the room temperature atmosphere and connected to the corresponding testing instruments. When a certain pitch angle rotation of the sample is required, the lower end of the control manipulator mounted on the top of the cryogenic vacuum equipment body is connected to a control cable 400. One end of the control cable 400 is connected to the displacement rod of the control manipulator, and the other end is connected to the first rotating wheel 210. Under the pull of the control cable 400, the sample connecting platform 200 rotates and tilts upward, swinging at a certain angle. When the manipulator stops applying upward tension to the first rotating wheel 210 and releases downward, the return elastic element 300 connected to the second rotating wheel 220 drives the sample connecting platform 200 to rotate downward. Thus, according to the needs of the experiment, the sample connecting platform 200 will swing back and forth, up and down, like a cradle, under the action of the manipulator and the return spring. Furthermore, the swing and angle can be adjusted according to the experimental requirements. Therefore, the cradle-type low-temperature sample holder of this embodiment completes the rotation and tilting / swinging movements for special low-temperature sample experiments.

[0049] The cradle-type cryogenic sample holder in this embodiment can be applied in cryogenic experiments with multi-directional vector magnets and plays a significant role in the process. The pitch angle of the sample on the sample connection stage 200 can be within ±30°, and the horizontal rotation can be within 45°, allowing for free rotation according to experimental requirements. This cryogenic experimental equipment can effectively perform characterization experiments of quantum materials under strong magnetic field conditions without interfering with the intrinsic magnetic field.

[0050] In summary, this application proposes a cradle-type cryogenic sample holder and cryogenic experimental equipment. The sample connecting platform adjusts its tilt angle by controlling the tension of the steel cable and the elastic force of the return elastic element, achieving a cradle-like swinging operation of the sample. This operation is flexible, accurate, simple in structure, and reliable in operation. Because stainless steel control cables and stainless steel return elastic elements are used as the most basic actuators, the operation avoids transmission errors caused by complex structures and transmission mechanisms, as well as problems such as wear and contamination of the vacuum chamber caused by machine parts. Furthermore, the left and right ends of the sample connecting platform are cleverly connected to two rotating wheels. By manipulating these wheels, the sample can be rotated (angle changed) within the positive and negative tilt range. Moreover, while the stainless steel control cables or return elastic elements drive the two circular rotating wheels to swing, the soft heat-conducting rope made of oxygen-free copper ensures that the sample temperature on the sample connecting platform remains consistent with the temperature of the sample mounting frame.

[0051] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A cradle-type low-temperature sample rack, characterized in that, include: Sample mounting bracket, which is used to be placed inside the experimental vacuum chamber; A sample connection stage, which is rotatably mounted on the sample mounting frame and used to mount the sample to be tested and the sensor; A return elastic element, one end of which is fixed and the other end is connected to the sample connection stage; A control cable, one end of which is connected to the sample connection platform and the other end of which is used to connect to an external control device; The sample connection platform can be adjusted in terms of tilting up and down by the tension of the control cable and the elastic force of the return elastic element. The sample connection stage is provided with a first rotating wheel and a second rotating wheel on both sides, and the first rotating wheel and the second rotating wheel are rotatably connected to the sample mounting frame through a rotating shaft; The control cable is connected to the first rotating wheel, and the return elastic element is connected to the second rotating wheel; The connection between the control cable and the first rotating wheel forms a first connection position, and the connection between the return elastic element and the second rotating wheel forms a second connection position. The first connection position and the second connection position are located on both sides of the rotation center of the sample connection stage, respectively. The sample mounting rack has an experimental chamber, and the sample connecting stage is rotatably disposed within the experimental chamber. The sample mounting rack has multiple slots that are connected to the experimental chamber. The return elastic element and the control cable extend to the outside of the experimental chamber through the slots.

2. The cradle-type low-temperature sample holder according to claim 1, characterized in that, The return elastic element includes: a pulling steel cable, which extends through the slot into the experimental chamber and connects to the sample connection stage; A spring segment, which is integrally formed with the pulling steel cable and located outside the experimental chamber.

3. The cradle-type low-temperature sample holder according to claim 1, characterized in that, A flexible heat conduction rope connects the sample connection platform and the sample mounting frame.

4. The cradle-type low-temperature sample holder according to claim 3, characterized in that, The flexible heat conduction rope is an oxygen-free copper rope.

5. The cradle-type low-temperature sample holder according to claim 1, characterized in that, The top of the sample mounting frame is provided with a hollow hanging rod, which is used to thread signal lines and wires. A fixing plate is provided on the hollow rod, and one end of the return elastic element is fixed on the fixing plate.

6. A low-temperature experimental apparatus, characterized in that, include: The body of the low-temperature vacuum equipment is equipped with a control device. And the cradle-type low-temperature sample holder as described in any one of claims 1-5, wherein the cradle-type low-temperature sample holder is disposed within the body of the low-temperature vacuum equipment, and the control device is connected to the control cable.

7. The low-temperature experimental apparatus according to claim 6, characterized in that, The control device includes a control manipulator, the displacement rod of which is connected to the control cable.

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