Rapid sample changing device for low-temperature cavity

Abstract

The invention discloses a low-temperature cavity rapid sample changing device, and relates to the technical field of low-temperature detection equipment, the low-temperature cavity rapid sample changing device comprises a detection cavity, a valve, a sample support and a locking mechanism, the detection cavity is provided with a sample transfer channel, a heat conduction seat is arranged in the detection cavity, the heat conduction seat is provided with a sliding groove, the valve is used for opening or closing the sample transfer channel, and the sample support is provided with a sliding block; the locking mechanism comprises two locking blocks, the two locking blocks can move oppositely in the sliding direction of the sliding blocks and get close to each other or get away from each other, and when the sliding blocks and the sliding grooves are in a sliding fit state, the locking blocks can move oppositely in the sliding direction of the sliding blocks. The two locking blocks get close to each other or get away from each other and are embedded between the sample support and the heat conducting seat to limit the sliding of the sliding block so as to realize locking, and the two locking blocks get away from each other or get close to each other so as to be separated from the sample support and the heat conducting seat so as to unlock the sliding block. The rapid sample changing device for the low-temperature cavity can greatly shorten the sample changing time and improve the sample changing efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of low-temperature detection equipment, and in particular to a low-temperature cavity rapid sample changing device. Background Art

[0002] In scientific research and industrial production, it is very important to detect the performance and characteristics of the sample under test in a low temperature or variable temperature environment. To this end, the existing technology usually uses a low temperature cavity or a vacuum cavity as a detection cavity, and the sample under test is carried by a sample holder arranged in the detection cavity, and the temperature of the sample holder and / or the environment in the detection cavity are controlled to meet the corresponding detection requirements.

[0003] In order to detect the performance of the sample under test at low temperature, the sample under test needs to be cooled to make its temperature reach the temperature required for the test. In the prior art, the coldness of the refrigerant is generally transferred to the sample holder in the test chamber through a heat-conducting structure, so that the sample holder transfers coldness to the sample and the sample under test is kept in a low temperature state; at the same time, in order to prevent the external environment from exchanging heat with the low-temperature sample under test and interfering with the temperature state of the sample under test, the test chamber is usually required to be evacuated.

[0004] For example, a low-temperature magnetic field probe station cooling structure disclosed in patent application number 202321643281.3 transfers cold energy to the sample holder through a cold source component and a cooling component to achieve performance and characteristic detection of the sample under low temperature conditions. After the test sample is tested, it is necessary to remove or replace the test sample. Since the space in the test chamber is usually small and the placement and replacement of the test sample on the sample holder requires manual operation, when replacing the test sample, it is necessary to open the cover of the test chamber for easy operation. In this process, in order to avoid damage to the operator due to low temperature, it is necessary to shut down the entire low-temperature system to restore it to normal temperature; after replacing the test sample, the test chamber needs to be cooled down again to the temperature required for detection, which greatly reduces the detection efficiency. Summary of the invention

[0005] The present application provides a low-temperature cavity rapid sample changing device to solve the current technical problem of taking too long to change the sample to be tested. The technical solution adopted in this application is: A low-temperature chamber rapid sample exchange device comprises a detection chamber, a valve, a sample holder and a locking mechanism, wherein the detection chamber is provided with a sample transfer channel communicating with the outside, a heat-conducting seat is provided in the detection chamber, the heat-conducting seat is provided with a slide groove, the valve is used to open or close the sample transfer channel, the sample holder is provided with a slider, the sample holder can carry the sample in and out of the detection chamber through the sample transfer channel, and the slider and the slide groove are slidably connected when entering the detection chamber, the locking mechanism comprises two locking blocks, along the sliding direction of the slider, the two locking blocks are symmetrically arranged at the two ends of the sample holder and can move in opposite directions relative to each other and move closer to each other or away from each other, when the slider and the slide groove are in a state of sliding cooperation, the two locking blocks move closer to each other or away from each other and are embedded between the sample holder and the heat-conducting seat to limit the sliding of the slider and achieve locking, the two locking blocks move away from each other or move closer to each other and disengage from between the sample holder and the heat-conducting seat to unlock the slider.

[0006] The low temperature chamber rapid sample changing device provided in this application also includes the following additional technical features: The locking mechanism also includes a rotating rod, which is fixed relative to the sample holder along the axial direction. One of the two locking blocks is in positive thread cooperation with the rotating rod, and the other locking block is in reverse thread cooperation with the rotating rod. The rotating rod drives the two locking blocks to move in opposite directions relative to each other by rotating relative to the sample holder.

[0007] The low-temperature chamber rapid sample changing device also includes a sample transfer rod, which, after cooperating with the rotating rod, can drive the sample holder in and out of the detection chamber and drive the rotating rod to rotate to achieve locking or unlocking of the slider in the slide groove; the sample transfer rod and the rotating rod can be detachably matched so that after locking the slider in the slide groove, it can be detached from the rotating rod and withdrawn from the detection chamber.

[0008] At least one end of the rotating rod is provided with a matching hole, and one end of the sample transfer rod is provided with a matching protrusion adapted to the matching hole, and the matching protrusion is inserted and matched with the matching hole at any end of the rotating rod so that the sample transfer rod and the rotating rod are relatively fixed along the rotation direction and axial direction; and / or, one of the sample transfer rod and the rotating rod is provided with a permanent magnet, and the other of the two is set as a metal part that can be magnetically attracted by the permanent magnet, so that the sample transfer rod and the rotating rod are magnetically matched by the permanent magnet.

[0009] The slide groove is arranged at the top of the heat-conducting seat and is configured as a T-shaped groove. The slider is arranged at the bottom of the sample holder and is configured as a T-shaped slider. The slider slides into the slide groove horizontally and is limited by the slide groove in the vertical direction. When the two locking blocks move closer to each other or away from each other, the bottom wall of the slide groove is pressed upward against the slider through the locking block to lock the slider.

[0010] The slider is provided with a locking channel which runs horizontally through both ends and is open at the bottom, and the two locking blocks move in opposite directions relative to each other in the locking channel; the locking channel is provided with guide slopes corresponding to the two locking blocks respectively, and the locking blocks are provided with locking slopes for cooperating with the guide slopes, and the locking blocks lock the slider by the locking slopes pressing upward against the guide slopes.

[0011] A detachable bottom plate is installed at the bottom of the slider, and the bottom plate covers the bottom opening of the locking channel. The lower end surface of the bottom plate does not protrude from the lower end surface of the slider, and both ends of the bottom plate are provided with notches to avoid the locking and unlocking stroke of the lock block.

[0012] The low-temperature cavity rapid sample changing device also includes a sample changing cavity. When the valve closes the sample transfer channel, the detection cavity is isolated from the sample changing cavity. When the valve opens the sample transfer channel, the sample transfer channel connects the detection cavity with the sample changing cavity. The sample changing cavity is provided with a sample changing port that can be opened or closed. The sample holder and the sample enter and exit the sample changing cavity through the sample changing port, and enter and exit the detection cavity through the sample transfer channel in the sample changing cavity.

[0013] The sample exchange chamber opens or closes the sample exchange port through a door body. When the door body closes the sample exchange port and the valve closes the sample transfer channel, the sample exchange chamber and the detection chamber are respectively sealed as vacuum-evacuable closed cavities, and the valve is configured as a gate valve.

[0014] The top and / or side of the detection cavity is provided with a transparent observation window.

[0015] Due to the adoption of the above technical solution, the technical effects achieved by this application include at least: 1. The low-temperature cavity rapid sample changing device provided by the present application, the detection cavity can be used as a closed cavity for testing the performance and characteristics of the sample under low temperature and / or vacuum environment, and a heat-conducting seat is provided in the detection cavity, and the heat-conducting seat can be used as a heat transfer structure for transferring cold to the sample holder as a cold source, so as to achieve the low temperature effect of the tested sample by cooling the sample holder. In this scheme, the detection cavity is provided with a sample transfer channel connected to the outside, and the sample holder can carry the sample in and out of the detection cavity through the sample transfer channel, so that after the low-temperature test of the previous sample, the sample holder and the tested sample can be taken out of the detection cavity through the sample transfer channel after opening the valve, and then the replaced sample and the sample holder are replaced into the detection cavity, without the need to perform the operation of replacing the sample in the detection cavity, reducing the problem of inefficiency caused by the limitation of the operation space for replacing the sample, and avoiding equipment damage caused by the operation of replacing the sample. At the same time, the operator will not be frostbitten by touching the detection cavity and / or the sample holder, which greatly shortens the sample replacement time and improves the sample replacement efficiency. After the sample holder is sent into the detection chamber, it can be installed on the thermal seat by slidingly connecting the slider and the slide groove. On the one hand, the sample holder is limited, especially the limit in the vertical direction along the sliding direction. On the other hand, the convenience of the sample holder and the thermal seat is improved. In addition, the method for driving the sample holder to slide relative to the thermal seat is widely selectable, and the driving method with low cost, reliable use and easy operation can be selected. In addition, the sample holder and the thermal seat are locked by a locking mechanism, and a relatively fixed state is maintained after locking, which is helpful for the stable placement of the sample to be tested, and can also ensure that the process of the tool used to send the sample holder into the detection chamber and lock it from the sample holder will not drive the sample holder to separate from the thermal seat. Furthermore, through the reliable locking of the sample holder and the thermal seat, the two are closely fitted, and the matching gap is reduced, which is helpful to improve the efficiency and effect of the cold transfer from the thermal seat to the sample holder, reduce the temperature difference between the two, and then facilitate the control of the temperature of the sample holder and the object to be tested, thereby helping to improve the temperature control accuracy and temperature adjustment efficiency. In addition, when the slider and the slide groove are in sliding cooperation, the two locking blocks of the locking mechanism move closer to or farther away from each other and are embedded between the sample holder and the thermal seat, and the two sides of the locking block are respectively pressed against the sample holder and the thermal seat, and huge friction resistance is generated between the sample holder and the locking block as well as between the sample holder and the thermal seat, thereby limiting the sliding of the slider and achieving the locking of the sample holder and the thermal seat, ensuring the reliability of the locking of the two. Moreover, the unlocking and locking of the slider only requires the relative reverse movement of the two locking blocks, which is simple and easy to operate. The requirements for the external driving mechanism used to drive the two locking blocks to move in the opposite direction during the sample changing process are relatively low, and the external driving mechanism is not required to perform complex actions, which helps to reduce the cost and difficulty of sample changing and improve the convenience and efficiency of sample changing. It is highly practical and easy to promote and use.The sample holder is fixed in the detection chamber to fix the position of the sample to be tested, and the valve is controlled to close the sample transfer channel to form a closed cavity in the detection chamber. In a feasible manner, it is convenient to maintain a low-temperature vacuum environment in the detection chamber or to re-form a low-temperature vacuum environment to prevent the external environment of the detection chamber from affecting the environment of the sample inside the detection chamber, so as to facilitate the detection of sample performance and characteristics under low temperature and / or vacuum conditions.

[0016] 2. As a preferred embodiment of the present application, one of the two locking blocks cooperates with the forward thread of the rotating rod, and the other locking block cooperates with the reverse thread of the rotating rod, so that the two locking blocks can move in opposite directions and approach each other by controlling the rotating rod to rotate in one direction by an external driving mechanism, and the two locking blocks can move in opposite directions and move away from each other by controlling the rotating rod to rotate in another direction opposite to the direction. Therefore, the original need for two sets of external driving mechanisms to control the relative reverse movement of the two locking blocks is converted into only needing to control the forward and reverse rotation of the rotating rod, which makes the control easier, has lower requirements on the structure and function of the external driving mechanism, and is more widely and easily selected. In addition, the sample holder is still allowed to maintain a relatively fixed posture during the rotation of the rotating rod relative to the sample holder, ensuring that the sample is stably placed on the sample holder.

[0017] 3. As a preferred method of the present application, the sample transfer rod and the rotating rod can cooperate to drive the sample holder to enter and exit the detection chamber and drive the rotating rod to rotate to achieve the locking or unlocking of the slider in the slide slot, replacing the existing operation mode in which the operator puts his hand into the detection chamber to achieve sample replacement, avoiding the risk of low temperature damage, and improving the convenience of operation and detection efficiency. Moreover, the sample transfer rod is more resistant to low temperatures than the human body, so that the sample holder and the sample in a relatively low temperature state can be taken out of the detection chamber by the sample transfer rod without heating the sample to a temperature range that the human body can touch, and the detection chamber does not need to be heated, further improving the sample replacement detection efficiency. The sample holder can enter and exit the detection chamber directly through the sample transfer rod outside the detection chamber, and the sample holder and the heat conducting seat can be locked or unlocked by driving the rotating rod to rotate through the sample transfer rod, realizing the integration of multiple functions on the sample transfer rod, which helps to simplify the structure of the sample replacement device and improve the sample replacement efficiency. The sample transfer rod and the rotating rod can be detachably matched, so that after the sample for the next round of detection and another sample holder are replaced in the detection chamber, the sample transfer rod can be withdrawn from the detection chamber to avoid interfering with the detection process. The valve is also allowed to close the sample transfer channel to facilitate the realization of a low temperature and / or vacuum environment in the detection chamber through technology.

[0018] 4. As a preferred embodiment of the present application, the cooperation of the T-slot and the T-slide block, in addition to realizing a sliding connection between the sample holder and the thermal seat, can also enable the thermal seat to limit the sample holder in the vertical direction along the sliding direction, including limiting in the vertical direction. The locking block is embedded between the bottom of the slider and the bottom wall of the slide slot. The locking block presses the slider upward so that the planes at both ends of the slider press against the top surface of the T-slot, thereby generating a huge static friction force between the slider and the top surface of the T-slot. The static friction force can act in the direction of limiting the sliding of the slider, thereby ensuring the locking reliability of the sample holder and the thermal seat.

[0019] 5. As a preferred embodiment of the present application, the sample holder and the sample enter and exit the sample exchange chamber through the sample exchange port, and enter and exit the detection chamber through the sample transfer channel in the sample exchange chamber. When the sample in the detection chamber needs to be replaced, the sample exchange chamber and the detection chamber can be kept in the same chamber environment (e.g., the same air pressure environment, the same temperature environment, etc.) in advance by technical means. After the valve is opened, the sample transfer rod drives the rotating rod to rotate so that the locking block unlocks the sample holder and the heat transfer seat. The sample holder is taken out of the detection chamber and put into the sample exchange chamber by the sample transfer rod. Since the sample exchange chamber and the detection chamber have the same chamber environment, the sample holder can be removed from the detection chamber and put into the sample exchange chamber by the sample transfer rod. The environment in the test cavity will not be affected by the sample changing cavity. After the sample holder and the sample enter the sample changing cavity, the valve is controlled to be closed to prevent the outside atmosphere from affecting the environment in the test cavity when the sample changing port is opened. After the sample changing port is opened, the sample is taken out of the sample changing cavity. At this time, the next sample can be set on the sample holder. After the sample changing port is closed, the sample changing cavity and the test cavity are kept in the same cavity environment again. Then the valve is controlled to open, and the sample and the sample holder are sent into the test cavity by the sample transfer rod, which drives the rotating rod to rotate so that the locking block locks the sample holder and the heat conducting seat. Finally, the sample transfer rod is withdrawn from the test cavity and the valve is closed. Therefore, by designing the sample changing cavity, the cavity environment in the test cavity will not change basically during the whole sample changing process, eliminating the existing process of opening the cover of the test cavity to change the sample and re-evacuating the sample, effectively improving the sample changing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of a low-temperature chamber rapid sample changing device provided in an embodiment of the present application; Figure 2 An assembly diagram of the sample transfer rod, heat transfer seat, sample holder, rotating rod and locking mechanism provided in the embodiment of the present application; Figure 3 A cross-sectional view of an assembly formed by a sample transfer rod, a heat transfer seat, a sample holder, a rotating rod and a locking mechanism provided in an embodiment of the present application; Figure 4A cross-sectional view of an assembly formed by a rotating rod, a heat-conducting seat, a sample holder and a locking mechanism provided in an embodiment of the present application; Figure 5 A cross-sectional view of an assembly formed by a rotating rod, a sample holder and a locking mechanism provided in an embodiment of the present application; Figure 6 An assembly diagram of the rotating rod and the locking structure provided in the embodiment of the present application; Figure 7 A schematic diagram of the structure of the locking block provided in the embodiment of the present application; Figure 8 A schematic diagram of the structure of the sample transfer rod provided in the embodiment of the present application; Fig. 9 A schematic diagram of the structure of the sample holder provided in the embodiment of the present application; Fig.10 A cross-sectional view of a sample holder provided in an embodiment of the present application; Fig.11 A schematic diagram of the structure of the heat-conducting seat provided in an embodiment of the present application; Fig.12 An assembly diagram of the sample holder and the base plate provided in the embodiment of the present application; Fig.13 A schematic diagram of the structure of the base plate provided in an embodiment of the present application.

[0021] List of parts and reference numerals: 1 detection chamber, 11 sample transfer channel, 12 observation window; 2 heat conducting seats, 21 slide slots; 3 valves; 4 sample holder, 41 slider, 411 recessed area, 42 locking channel, 43 guide slope, 44 bottom plate, 441 notch; 5 locking block, 51 locking inclined surface; 6 rotating rod, 61 matching hole; 7 a sample transfer rod, 71 a matching convex portion; 8 a sample changing cavity, 81 a through hole, 82 a sample changing port; 9 doors. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0024] In addition, in the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "lateral", "longitudinal", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] In the embodiment of the present application, a low temperature chamber rapid sample changing device is provided. For the convenience of explanation and understanding, the following contents provided in the present application are all described based on the illustrated product structure. Of course, those skilled in the art can understand that the above structure is only used as a specific example and schematic description, and cannot constitute a specific limitation on the technical solution provided in the present application.

[0028] like Figures 1 to 13As shown, a low-temperature chamber rapid sample exchange device provided in the present application includes a detection chamber 1, a valve 3, a sample holder 4 and a locking mechanism. The detection chamber 1 is provided with a sample transfer channel 11 connected to the outside, a heat-conducting seat 2 is provided in the detection chamber 1, and the heat-conducting seat 2 is provided with a slide groove 21. The valve 3 is used to open or close the sample transfer channel 11. The sample holder 4 is provided with a slider 41. The sample holder 4 can carry the sample in and out of the detection chamber 1 through the sample transfer channel 11, and the slider 41 and the slide groove 21 are slidably connected when entering the detection chamber 1. The locking mechanism includes two locking blocks 5. Along the sliding direction of the slider 41, the two locking blocks 5 are symmetrically arranged at both ends of the sample holder 4 and can move in opposite directions relative to each other and move closer to each other or away from each other. When the slider 41 and the slide groove 21 are in a state of sliding cooperation, the two locking blocks 5 move closer to each other or away from each other and are embedded between the sample holder 4 and the heat-conducting seat 2 to limit the sliding of the slider 41 and achieve locking. The two locking blocks 5 move away from each other or move closer to each other and disengage from between the sample holder 4 and the heat-conducting seat 2 to unlock the slider 41.

[0029] The low-temperature cavity rapid sample changing device provided in the present application, the detection cavity 1 can be used as a closed cavity for testing the performance and characteristics of the sample under low temperature and / or vacuum environment, a thermal conductive seat 2 is provided in the detection cavity 1, the thermal conductive seat 2 is connected to a cold source, and serves as a heat transfer structure for transferring cold from the cold source to the sample holder 4, the cold source transfers the cold energy to the thermal conductive seat 2, and the thermal conductive seat 2 transfers the cold energy to the sample holder 4, so as to cool down or control the temperature of the sample to be tested by cooling the sample holder 4, so as to achieve a low temperature effect for the sample to be tested.

[0030] In this solution, the detection chamber 1 is provided with a sample transfer channel 11 connected to the outside, and the sample holder 4 can carry the sample in and out of the detection chamber 1 through the sample transfer channel 11, so that after the low-temperature detection of the previous sample, the valve 3 can be opened to take the sample holder 4 and the detected sample out of the detection chamber 1 through the sample transfer channel 11, and then the replaced sample and the sample holder 4 are replaced into the detection chamber 1, and there is no need to replace the sample in the detection chamber 1, which can avoid frost on the inside of the detection chamber 1 caused by replacing the sample in the detection chamber 1 in a low-temperature state, and thus avoid equipment damage such as damage to the electrical connectors in the detection chamber 1 and corrosion of the metal surface, and can also reduce the problem of inefficiency caused by the limitation of the operating space for replacing the sample. At the same time, the operator will not suffer from frostbite due to touching the detection chamber 1 and / or the sample holder 4. There is no need to heat up the detection chamber 1 when taking out the sample, and there is no need to cool down the detection chamber 1 when putting in a new sample, which greatly shortens the sample replacement time and improves the sample replacement efficiency.

[0031] After the sample holder 4 is sent into the detection chamber 1, it can be installed on the thermal seat 2 by slidingly connecting the slider 41 and the slide groove 21. On the one hand, it forms a limit for the sample holder 4, especially a limit in the vertical direction along the sliding direction. On the other hand, it also improves the convenience of the sample holder 4 and the thermal seat 2. In addition, there are many options for driving the sample holder 4 to slide relative to the thermal seat 2, and a low-cost, reliable, and easy-to-operate method can be selected to achieve driving.

[0032] In addition, the sample holder 4 and the thermal seat 2 are locked by a locking mechanism, and a relatively fixed state is maintained after locking, which helps to place the sample to be tested stably, and can also ensure that the process of the tool used to send the sample holder 4 into the detection chamber 1 and lock it away from the sample holder 4 will not cause the sample holder 4 to separate from the thermal seat 2. Furthermore, by reliably locking the sample holder 4 and the thermal seat 2, the two are tightly fitted and the matching gap is reduced, which helps to improve the efficiency and effect of cold transfer from the thermal seat 2 to the sample holder 4, reduce the temperature difference between the two, and then facilitate the control of the temperature of the sample holder 4 and the object to be tested it carries, thereby helping to improve the temperature control accuracy and temperature adjustment efficiency.

[0033] In addition, when the slider 41 and the slide groove 21 are in sliding cooperation, the two locking blocks 5 of the locking mechanism are close to or away from each other and embedded between the sample holder 4 and the thermal seat 2. The two sides of the locking block 5 are respectively pressed against the sample holder 4 and the thermal seat 2, and huge friction resistance is generated between the sample holder 4 and the locking block 5 as well as between the sample holder 4 and the thermal seat 2, thereby limiting the sliding of the slider 41 and achieving the locking of the sample holder 4 and the thermal seat 2, ensuring the reliability of the locking of the two. Moreover, the unlocking and locking of the slider 41 only requires the relative reverse movement of the two locking blocks 5, which is simple and easy to operate. The requirements for the external driving mechanism used to drive the two locking blocks 5 to move in the opposite direction during the sample changing process are relatively low, and the external driving mechanism does not need to perform complex actions, which helps to reduce the sample changing cost and difficulty, improve the sample changing convenience and efficiency, and is highly practical and easy to promote and use.

[0034] The sample holder 4 is fixed in the detection chamber 1 to fix the position of the sample to be tested, and the valve 3 is controlled to close the sample transfer channel 11, so that the detection chamber 1 forms a closed cavity. In a feasible manner, it is convenient to maintain a low-temperature vacuum environment or re-form a low-temperature vacuum environment in the detection chamber 1 to prevent the external environment of the detection chamber 1 from affecting the environment of the sample inside the detection chamber 1, so as to facilitate the detection of sample performance and characteristics under low temperature and / or vacuum conditions.

[0035] It should be noted that the embodiment illustrated in the drawings of the present application is that the two locking blocks 5 are close to each other and embedded between the sample holder 4 and the heat-conducting seat 2 to achieve locking of the slider 41, and the two locking blocks 5 are separated from each other and detached from between the sample holder 4 and the heat-conducting seat 2 to achieve unlocking of the slider 41, so the following description of the technical solution is based on this. In an embodiment not illustrated, the two locking blocks can also be separated from each other and embedded between the sample holder and the heat-conducting seat to achieve locking of the slider, and the two locking blocks are close to each other and detached from between the sample holder and the heat-conducting seat to achieve unlocking of the slider.

[0036] The present application does not limit the method of driving the two locking blocks 5 to move in opposite directions. As a specific implementation method, the two locking blocks 5 can correspond to a set of driving mechanisms respectively, and the two sets of driving mechanisms can drive the two locking blocks 5 to move back and forth respectively to achieve locking or unlocking of the slider 41. As a preferred implementation method, Figures 1 to 7 As shown, the locking mechanism also includes a rotating rod 6, which is relatively fixed to the sample holder 4 along the axial direction, one of the two locking blocks 5 is threadedly matched with the rotating rod 6 in a positive direction, and the other locking block 5 is threadedly matched with the rotating rod 6 in a reverse direction, and the rotating rod 6 drives the two locking blocks 5 to move in the opposite direction by rotating relative to the sample holder 4. It can be understood by those skilled in the art that one of the two locking blocks 5 is threadedly matched with the rotating rod 6 in a positive direction, and the other locking block 5 is threadedly matched with the rotating rod 6 in a reverse direction, so that only by controlling the rotating rod 6 to rotate in one direction by an external driving mechanism can the two locking blocks 5 move in the opposite direction to each other, and by controlling the rotating rod 6 to rotate in another direction opposite to the direction, the two locking blocks 5 can move in the opposite direction to each other and move away from each other, thus, the original need for two sets of external driving mechanisms to control the relative reverse movement of the two locking blocks 5 is converted into only needing to control the forward and reverse rotation of the rotating rod 6, which makes the control more simple, has lower requirements on the structure and function of the external driving mechanism, and is more widely and easily selected. In addition, during the rotation of the rotating rod 6 relative to the sample holder 4 , the sample holder 4 is still allowed to maintain a relatively fixed posture, thereby ensuring that the sample is stably placed on the sample holder 4 .

[0037] Furthermore, if Figures 1 to 3As shown, the low-temperature chamber rapid sample changing device also includes a sample transfer rod 7, which, when cooperated with the rotating rod 6, can drive the sample holder 4 to enter and exit the detection chamber 1 and drive the rotating rod 6 to rotate to achieve locking or unlocking of the slider 41 in the slide groove 21; the sample transfer rod 7 and the rotating rod 6 can be detachably cooperated so that after the slider 41 is locked in the slide groove 21, it can be detached from the rotating rod 6 and withdrawn from the detection chamber 1. When changing samples, it is necessary to first carry out the sampling stage and then the sample placement stage. In the sampling stage, the sample transfer rod 7 needs to be extended into the detection chamber 1 through the sample transfer channel 11 and cooperate with the rotating rod 6, and then the sample transfer rod 7 is rotated to synchronously drive the rotating rod 6 to rotate, so that the two locking blocks 5 move away from each other to unlock the sample holder 4 and the thermal seat 2, and then the sample holder 4 and the sample supported by it are taken out through the sample transfer channel 11 by the sample transfer rod 7. At this time, the sample placement stage can be carried out. Specifically, the sample holder 4 supporting the sample is installed on the sample transfer rod 7 through the rotating rod 6 on the outside of the detection chamber 1, and then the sample holder 4 is driven by the sample transfer rod 7 to enter the detection chamber 1 through the sample transfer channel 11 and then slide connected with the thermal seat 2, and then the rotating rod 6 is driven to rotate, so that the two locking blocks 5 move closer to each other to lock the sample holder 4 and the thermal seat 2. After the sample holder 4 and the thermal seat 2 are locked, the sample transfer rod 7 is withdrawn from the detection chamber 1, and finally the valve 3 is closed. It is understood by those skilled in the art that the sample transfer rod 7 can drive the sample holder 4 to enter and exit the detection chamber 1 and drive the rotating rod 6 to rotate to achieve the locking or unlocking of the slider 41 in the slide groove 21 after cooperating with the rotating rod 6, replacing the existing operation mode in which the operator puts his hand into the detection chamber to achieve sample replacement, avoiding the risk of low temperature damage, and improving the convenience of operation and detection efficiency. Moreover, the sample transfer rod 7 is more resistant to low temperatures than the human body, so that the sample holder 4 and the sample in a relatively low temperature state can be taken out of the detection chamber 1 by the sample transfer rod 7 without heating the sample to a temperature range that the human body can touch, and the detection chamber 1 does not need to be heated, further improving the sample replacement detection efficiency. The sample holder 4 can enter and exit the detection chamber 1 directly through the sample transfer rod 7 outside the detection chamber 1, and the sample transfer rod 7 can also drive the rotating rod 6 to rotate to control the locking block 5 to lock or unlock the sample holder 4 and the heat conducting seat 2, realizing the integration of multiple functions on the sample transfer rod 7, which helps to simplify the structure of the sample replacement device and improve the sample replacement efficiency. The sample transfer rod 7 and the rotating rod 6 are detachably matched, so that after the sample for the next round of detection and another sample holder 4 are replaced in the detection chamber 1, the sample transfer rod 7 can be withdrawn from the detection chamber 1 to avoid interfering with the detection process. The valve 3 is also allowed to close the sample transfer channel 11, so as to achieve a low temperature and / or vacuum environment in the detection chamber 1 through technology.

[0038] In some cases, a displacement device may be provided to drive the heat-conducting seat 2 to move, thereby facilitating the insertion of the sample holder 4 into the T-slot of the heat-conducting seat 2 .

[0039] In some cases, a slide groove can be provided on the sample transfer rod 7. When the sample transfer rod 7 drives the sample holder 4 to move, the slide groove prevents the sample transfer rod 7 from rotating, so as to prevent the sample holder 4 from rotating during the movement and causing the sample to fall off. Figure 3 , Figure 6 and Figure 8 As shown, at least one end of the rotating rod 6 is provided with a matching hole 61, and one end of the sample transfer rod 7 is provided with a matching protrusion 71 adapted to the matching hole 61, and the matching protrusion 71 is inserted and matched with the matching hole 61 at any end of the rotating rod 6 so that the sample transfer rod 7 and the rotating rod 6 are relatively fixed along the rotation direction and axial direction. Preferably, the matching hole 61 can be a hexagonal countersunk hole, and the matching protrusion 71 can be an external hexagonal slot head adapted to the hexagonal countersunk hole, so that the sample transfer rod 7 and the rotating rod 6 can be reliably matched. As another preferred embodiment, one of the sample transfer rod 7 and the rotating rod 6 is provided with a permanent magnet, and the other is set as a metal piece that can be magnetically attracted by the permanent magnet, so that the sample transfer rod 7 and the rotating rod 6 are magnetically attracted by the permanent magnet. For example, the rotating rod 6 can be a metal piece, and the sample transfer rod 7 is provided with a permanent magnet, and the sample transfer rod 7 and the rotating rod 6 can be separably matched through the adsorption effect of the permanent magnet on the rotating rod 6. Preferably, both ends of the rotating rod 6 may be provided with matching holes 61 , so that the rotating rod 6 can be matched with any end of the rotating rod 6 .

[0040] As another preferred embodiment, a matching mechanism can be provided on the sample transfer rod 7 so that the matching mechanism of the sample transfer rod 7 matches with the sample holder 4, so that the sample holder 4 can be driven to move by the sample transfer rod 7 to adjust the relative position between the sample holder 4 and the thermal seat 2; when the relative position between the sample holder 4 and the thermal seat 2 is fixed, the matching mechanism of the sample transfer rod 7 can be released from the sample holder 4, and the sample transfer rod 7 can be separated from the rotating rod 6, so that the rotating rod 6 can be driven to rotate by the sample transfer rod 7.

[0041] As a feasible implementation, a limiting structure can be provided on the thermal base 2 to limit the sliding range of the sample holder 4 in the T-slot. Optionally, the limiting structure can limit the maximum displacement range of the sample holder 4 when the sample holder 4 enters the T-slot.

[0042] As a preferred implementation of the present application, Figure 2 , Figure 4 , Fig. 9 and Fig.11As shown, all the aforementioned embodiments and examples of the present application can further enable the slide groove 21 to be disposed on the top of the thermal seat 2 and configured as a T-shaped groove, the slider 41 to be disposed at the bottom of the sample holder 4 and configured as a T-shaped slider, the slider 41 to slide into the slide groove 21 horizontally and to be limited by the slide groove 21 in the vertical direction; the two locking blocks 5 can move closer to each other or away from each other, so that the bottom wall of the slide groove 21 can press upward against the slider 41 through the locking block 5 to lock the slider 41. Those skilled in the art can understand that the cooperation of the T-slot and the T-slider, in addition to realizing a sliding connection between the sample holder 4 and the thermal seat 2, can also enable the thermal seat 2 to limit the sample holder 4 in a vertical direction along the sliding direction, including limiting in the vertical direction. The locking block 5 is embedded between the bottom of the slider 41 and the bottom wall of the slide groove 21. The locking block 5 presses upward against the slider 41, so that the planes at both ends of the slider 41 press against the top surface of the T-slot, so that a huge static friction force is generated between the slider 41 and the top surface of the T-slot. The static friction force can act in the direction of limiting the sliding of the slider 41, thereby ensuring the locking reliability of the sample holder 4 and the thermal seat 2.

[0043] Furthermore, if Figure 4 , Figure 5 , Figure 7 , Fig. 9 and Fig.10 As shown, the slider 41 is provided with a locking channel 42 which runs horizontally through both ends and is open at the bottom, and the two locking blocks 5 move in opposite directions relative to each other in the locking channel 42; the locking channel 42 is provided with guide slopes 43 respectively corresponding to the two locking blocks 5, and the locking blocks 5 are provided with locking slopes 51 for cooperating with the guide slopes 43, and the locking blocks 5 lock the slider 41 by pressing the guide slopes 43 upward with the locking slopes 51. Specifically, the rotating rod 6 can be installed in the locking channel 42 and the axial direction of the rotating rod 6 is along the length direction of the locking channel 42, and the two locking blocks 5 which are threadedly connected to the rotating rod 6 are also located in the locking channel 42. Under the limiting cooperation of the two locking blocks 5 and the sample holder 4, the rotating rod 6 is limited from moving axially relative to the locking channel 42 to ensure that the rotating rod 6 is relatively fixed to the sample holder 4 along the axial direction. The bottom opening of the locking channel 42 ensures that the locking inclined surface 51 of the locking block 5 in the locking channel 42 presses upward against the guiding inclined surface 43 of the slide block 41, while the bottom surface of the locking block 5 passes through the bottom opening of the locking channel 42 and presses downward against the bottom surface of the slide groove 21. Specifically, the two guiding inclined surfaces 43 in the locking channel 42 are symmetrically arranged.

[0044] Furthermore, if Figure 5 , Fig.12 and Fig.13As shown, a detachable bottom plate 44 is installed at the bottom of the slider 41, and the bottom plate 44 covers the bottom opening of the locking channel 42. The lower end surface of the bottom plate 44 does not protrude from the lower end surface of the slider 41, and the two ends of the bottom plate 44 are provided with notches 441 to avoid the locking and unlocking stroke of the lock block 5. It can be understood by those skilled in the art that by making the bottom plate 44 and the slider 41 detachable, during the assembly process, the rotating rod 6 and the locking block 5 can be first installed in the locking channel 42, and then the bottom plate 44 can be installed to improve the convenience of assembly. After the bottom plate 44 covers the bottom opening of the locking channel 42, a stop limit is formed for the locking block 5 and / or the rotating rod 6 to prevent the locking block 5 from moving downward and slipping out of the locking channel 42. The two ends of the bottom plate 44 are provided with notches 441 for avoiding the locking and unlocking strokes of the locking block 5, so that the relative reverse movement of the two locking blocks 5 under the rotation of the rotating rod 6 is carried out in the notches 441, and it is ensured that the locking inclined surface 51 of the locking block 5 is pressed against the guiding inclined surface 43 in the locking channel 42, and the bottom surface of the locking block 5 is also pressed against the bottom surface of the slide groove 21. In a preferred embodiment, the bottom plate 44 can be detachably mounted on the bottom of the slider 41 by screws. A recessed area 411 can be set at the bottom of the slider 41, and the bottom plate 44 is installed in the recessed area 411 to ensure that the lower end surface of the bottom plate 44 does not protrude from the lower end surface of the slider 41. Through this arrangement, it is possible to avoid the bottom plate 44 and the side wall of the heat-conducting seat 2 from resisting each other in the process of the slider 41 preparing to enter the slide groove 21, thereby preventing the slider 41 from being blocked from entering the slide groove 21, and ensuring that the slider 41 can be smoothly connected and matched with the slide groove 21 in the process of the sample holder 4 being driven to move horizontally by the sample transfer rod 7.

[0045] As a preferred implementation of the present application, Figure 1 As shown, all the aforementioned embodiments and examples of the present application can further enable the low-temperature chamber rapid sample changing device to further include a sample changing chamber 8. When the valve 3 closes the sample transfer channel 11, the detection chamber 1 is isolated from the sample changing chamber 8. When the valve 3 opens the sample transfer channel 11, the sample transfer channel 11 connects the detection chamber 1 with the sample changing chamber 8. The sample changing chamber 8 is provided with a sample changing port 82 that can be opened or closed. The sample holder 4 and the sample enter and exit the sample changing chamber 8 through the sample changing port 82, and enter and exit the detection chamber 1 through the sample transfer channel 11 in the sample changing chamber 8. Specifically, taking the technical solution of driving the sample holder 4 to enter and exit the detection chamber 1 and driving the sample holder 4 to rotate by the sample transfer rod 7 as an example, as shown in FIG. Figure 1As shown, a through hole 81 for inserting the sample transfer rod 7 can be provided on the side wall of the sample exchange chamber 8, and the through hole 81 is arranged opposite to the sample transfer channel 11, and the sample transfer rod 7 can slide along the through hole 81 to carry the sample holder 4 and the sample through the sample transfer channel 11 to enter and exit the detection chamber 1. It can be understood by those skilled in the art that, through this design, when it is necessary to replace the sample in the detection chamber 1, the sample exchange chamber 8 and the detection chamber 1 can be maintained in the same chamber environment (for example, the same air pressure environment, the same temperature environment, etc.) by technical means in advance, and then the valve 3 is opened and the sample transfer rod 7 enters the detection chamber 1, and after the sample holder 4 and the heat conductive seat 2 are unlocked, the sample holder 4 is taken out from the detection chamber 1 to the sample exchange chamber 8 through the sample transfer rod 7. Because the sample exchange chamber 8 and the detection chamber 1 have the same chamber environment, when the valve 3 is opened, the environment in the detection chamber 1 will not be affected by the sample exchange chamber 8 and will not change. After the sample holder 4 and the sample enter the sample changing chamber 8, the control valve 3 is closed to prevent the outside atmosphere from affecting the environment in the detection chamber 1 when the sample changing port 82 is opened. After the sample changing port 82 is opened, the sample is taken out of the sample changing chamber 8. At this time, the next sample can be set on the sample holder 4, and then the sample changing port 82 is closed to convert the sample changing chamber 8 to the same chamber environment as the detection chamber 1. Then the control valve 3 is opened, and the sample and the sample holder 4 are sent into the detection chamber 1 through the sample transfer rod 7, and then the sample transfer rod 7 is operated to rotate, and the sample holder 4 and the heat conducting seat 2 are locked through the rotating rod 6 and the locking block 5. Finally, the sample transfer rod 7 is withdrawn from the detection chamber 1 and the valve 3 is closed. Therefore, by designing the sample changing chamber 8, the chamber environment in the detection chamber 1 will basically not change during the entire sample changing process, eliminating the existing process of opening the cover of the detection chamber to change the sample and re-vacuuming, and effectively improving the sample changing efficiency. In actual use, the original sample changing time of 5-7 hours can be shortened to about 2 hours, greatly improving the sample changing efficiency.

[0046] Furthermore, if Figure 1As shown, the sample changing chamber 8 opens or closes the sample changing port 82 through the door body 9. When the door body 9 closes the sample changing port 82 and the valve 3 closes the sample transfer channel 11, the sample changing chamber 8 and the detection chamber 1 are respectively sealed as a closed chamber that can be evacuated, and the valve 3 is set as a gate valve. It can be understood by those skilled in the art that, when the door body 9 closes the sample changing port 82, only the valve 3 needs to be closed to simultaneously achieve the isolation and closure of the detection chamber 1 and the sample changing chamber 8, thereby achieving the functional integration of the valve 3 and simplifying the structure of the sample changing device. Specifically, the sample changing chamber 8 can be installed as a whole on the outer wall of the detection chamber 1, and the edge of the sample changing chamber 8 is sealed with the outer wall of the detection chamber 1. A sealing structure is also provided between the sample transfer rod 7 and the through hole 81 to isolate the outside atmosphere and the sample changing chamber 8. The detection chamber 1 is sealed as a vacuum-evacuable closed chamber, so that the detection chamber 1 can be tested under a vacuum environment to prevent the external atmosphere from interfering with the detection process; the sample exchange chamber 8 is sealed as a vacuum-evacuable closed chamber to optimize the sample exchange process. In the process of moving the sample and the sample holder 4 from the detection chamber 1 into the sample exchange chamber 8 and in the process of moving the sample and the sample holder 4 from the sample exchange chamber 8 into the detection chamber 1, the sample exchange chamber 8 and the detection chamber 1 can be kept in the same vacuum environment in advance by technical means, so that when the valve 3 is opened, the environment in the detection chamber 1 will not be affected by the sample exchange chamber 8 and change, thereby helping to improve the sample exchange efficiency and detection efficiency. The valve 3 is a gate valve, which can well seal the detection chamber 1 and the sample exchange chamber 8 after closing the sample transfer channel 11.

[0047] As a preferred embodiment, a transparent observation window 12 may be provided on the top and / or side of the detection chamber 1, for example, Figure 1 As shown, an embodiment in which an observation window 12 is provided on the top of the detection chamber 1 is schematically illustrated. The observation window 12 can be made of transparent glass, transparent plastic or other light-transmitting materials. By providing the transparent observation window 12, on the one hand, it is convenient to observe the state change of the sample during the detection process. On the other hand, through the observation window 12, it is convenient to observe whether the sample transfer rod 7 is inserted into the rotating rod 6 when sampling, and whether the locking block 5 unlocks the sample holder 4 and the thermal seat 2 in place through the rotation of the sample transfer rod 7. It is also convenient to observe whether the sample holder 4 and the thermal seat 2 are locked in place by the rotation of the sample transfer rod 7 during sample placement, which improves the convenience of sample change and avoids the difficulty of sample change due to sample change without field of view.

[0048] In some cases, a corresponding detection device that uses light as a detection means may be arranged at the observation window 12. For example, a magneto-optical Kerr detection device may be arranged at the observation window 12 and the detection light may enter and exit the detection cavity 1 through the observation window 12. Other detection devices may be further arranged inside the detection cavity 1, and the positional relationship between the corresponding detection device and the object to be measured may be observed through the observation window 12. For example, a probe detection device may be further arranged inside the detection cavity 1, and the contact position and contact state of the probe and the object to be measured may be observed through the observation window 12.

[0049] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0050] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0051] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A low temperature chamber rapid sample changing device, characterized in that: include: A detection chamber, wherein the detection chamber is provided with a sample transfer channel communicating with the outside, a heat-conducting seat is provided in the detection chamber, and the heat-conducting seat is provided with a slide groove; A valve, the valve is used to open or close the sample transfer channel; A sample tray, wherein the sample tray is provided with a slider, and the sample tray can carry the sample into and out of the detection cavity through the sample transfer channel, and when entering the detection cavity, the slider is slidably connected with the slide groove; A locking mechanism, wherein the locking mechanism comprises two locking blocks, which are symmetrically arranged at two ends of the sample holder along the sliding direction of the slider and can move in opposite directions relative to each other to move closer to each other or away from each other; When the slider and the slide groove are in sliding cooperation, the two locking blocks move closer to each other or farther away from each other and are embedded between the sample holder and the thermal seat to limit the sliding of the slider and achieve locking. The two locking blocks move away from each other or closer to each other and are disengaged from between the sample holder and the thermal seat to unlock the slider.

2. The low-temperature chamber rapid sample changing device according to claim 1, characterized in that: The locking mechanism also includes a rotating rod, which is fixed relative to the sample holder along the axial direction. One of the two locking blocks is in positive thread cooperation with the rotating rod, and the other locking block is in reverse thread cooperation with the rotating rod. The rotating rod drives the two locking blocks to move in opposite directions relative to each other by rotating relative to the sample holder.

3. The low temperature chamber rapid sample changing device according to claim 2, characterized in that: The low-temperature chamber rapid sample changing device also includes a sample transfer rod, which, after cooperating with the rotating rod, can drive the sample holder in and out of the detection chamber and drive the rotating rod to rotate to achieve locking or unlocking of the slider in the slide groove; the sample transfer rod and the rotating rod can be detachably matched so that after locking the slider in the slide groove, it can be detached from the rotating rod and withdrawn from the detection chamber.

4. The low-temperature chamber rapid sample changing device according to claim 3, characterized in that: At least one end of the rotating rod is provided with a matching hole, and one end of the sample transfer rod is provided with a matching convex portion adapted to the matching hole, and the matching convex portion is inserted and matched with the matching hole at any end of the rotating rod so that the sample transfer rod and the rotating rod are relatively fixed along the rotation direction and the axial direction; And / or, one of the sample transfer rod and the rotating rod is provided with a permanent magnet, and the other of the two is provided as a metal piece that can be magnetically attracted by the permanent magnet, so that the sample transfer rod and the rotating rod are magnetically matched by the permanent magnet.

5. The low temperature chamber rapid sample changing device according to any one of claims 1 to 4, characterized in that: The slide groove is arranged at the top of the heat-conducting seat and is configured as a T-shaped groove. The slider is arranged at the bottom of the sample holder and is configured as a T-shaped slider. The slider slides into the slide groove horizontally and is limited by the slide groove in the vertical direction. When the two locking blocks move closer to each other or away from each other, the bottom wall of the slide groove is pressed upward against the slider through the locking block to lock the slider.

6. The low-temperature chamber rapid sample changing device according to claim 5, characterized in that: The slider is provided with a locking channel which runs horizontally through both ends and is open at the bottom, and the two locking blocks move in opposite directions relative to each other in the locking channel; the locking channel is provided with guide slopes corresponding to the two locking blocks respectively, and the locking blocks are provided with locking slopes for cooperating with the guide slopes, and the locking blocks lock the slider by the locking slopes pressing upward against the guide slopes.

7. The low temperature chamber rapid sample changing device according to claim 6, characterized in that: A detachable bottom plate is installed at the bottom of the slider, and the bottom plate covers the bottom opening of the locking channel. The lower end surface of the bottom plate does not protrude from the lower end surface of the slider, and both ends of the bottom plate are provided with notches to avoid the locking and unlocking stroke of the lock block.

8. The low temperature chamber rapid sample changing device according to any one of claims 1 to 4, characterized in that: The low-temperature cavity rapid sample exchange device further comprises a sample exchange cavity, and when the valve closes the sample transfer channel, the detection cavity is isolated from the sample exchange cavity, and when the valve opens the sample transfer channel, the sample transfer channel connects the detection cavity with the sample exchange cavity; The sample exchange cavity is provided with a sample exchange port which can be opened or closed. The sample holder and the sample enter and exit the sample exchange cavity through the sample exchange port, and enter and exit the detection cavity through the sample transfer channel in the sample exchange cavity.

9. The low-temperature chamber rapid sample changing device according to claim 8, characterized in that: The sample exchange chamber opens or closes the sample exchange port through a door body. When the door body closes the sample exchange port and the valve closes the sample transfer channel, the sample exchange chamber and the detection chamber are respectively sealed as vacuum-evacuable closed cavities, and the valve is configured as a gate valve.

10. The low-temperature chamber rapid sample changing device according to claim 1, characterized in that: The top and / or side of the detection cavity is provided with a transparent observation window.

Images