A cooling rod for low temperature environment

Abstract

The present invention discloses a cooling rod for low temperature environment, including a rod body, a rod head assembly, and a sample stage; the rod head assembly includes a rod head body, a sliding seat inserted in the rod head body, a pre-tightening mechanism arranged in the rod head body, and a locking mechanism arranged in the sliding seat; the pre-tightening mechanism includes a first elastic member arranged in the rod head body; the locking mechanism includes a lifting shaft inserted in the sliding seat, a second elastic member arranged in the sliding seat, and a guide shaft arranged on the lifting shaft, the sliding seat and the rod head body are respectively used to limit the guide shaft from the top and the bottom, and the rod head body is used to drive the guide shaft to rotate synchronously when rotating; the locking mechanism also includes a locking shaft connected to the lower end of the lifting shaft, and a cam for the locking shaft to pass downward is provided in the base, and the cam has a cam bottom surface for driving the locking shaft to descend when the locking shaft rotates around the axis of the lifting shaft. The cooling rod of the present invention has high cooling efficiency, short cooling time, and good sample stage stability.

Description

Technical Field

[0001] The invention relates to the field of low-temperature physical property measurement, and in particular to a cooling rod used in a low-temperature environment. Background Art

[0002] The variable temperature and strong magnetic field comprehensive physical property measurement platform is an indispensable key instrument for measuring the electrical, magnetic, thermal and other physical properties of micro-nano devices and new materials.

[0003] In the prior art, a rod with a sample stage is generally inserted directly into a low-temperature strong magnetic field environment, and a low-temperature measurement environment of the sample in the rod is maintained by low-temperature gas. The cooling efficiency is low and the cooling time is relatively long. At the same time, the inserted rod has poor stability, which can easily affect the measurement accuracy of the sample. Summary of the invention

[0004] The object of the present invention is to provide a cooling rod for use in a low temperature environment, which has high cooling efficiency, short cooling time and good sample stage stability.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A cooling plug for use in a low-temperature environment, the cooling plug comprising a hollow rod body, a rod head assembly connected to the lower end of the rod body, and a sample stage arranged in the rod head assembly;

[0007] The rod head assembly includes a rod head body that is hollow, a sliding seat that is hollow and can be movably inserted into the rod head body, a pre-tightening mechanism that is arranged in the rod head body and used to pre-tighten the sliding seat, and a locking mechanism that is arranged in the sliding seat and used to connect to a base, and the lower end of the sliding seat extends downwardly from the rod head body;

[0008] The pre-tightening mechanism comprises a first elastic member disposed in the rod head body and configured to be compressed when the sliding seat moves upward relative to the rod head body;

[0009] The locking mechanism comprises a lifting shaft movably arranged in the sliding seat, a second elastic member arranged in the sliding seat and used to be compressed when the lifting shaft moves downward relative to the sliding seat, and a guide shaft arranged on the lifting shaft and sequentially inserted into the sliding seat and the rod head body, the sliding seat and the rod head body are respectively used to limit the guide shaft from the top and the bottom, and the rod head body is used to drive the guide shaft to rotate synchronously when rotating around its own axis.

[0010] The lower end of the lifting shaft extends downwardly out of the sliding seat, and the locking mechanism also includes a locking shaft connected to the lower end of the lifting shaft and used to penetrate downward into the base. The base is provided with a cam for being passed downward by the locking shaft, and the cam has a cam bottom surface for driving the locking shaft to descend when the locking shaft rotates around the axial center line direction of the lifting shaft.

[0011] Preferably, the first elastic member, the guide shaft and the second elastic member are arranged in sequence from top to bottom.

[0012] Preferably, a first abutting portion located below the sample stage and used for abutting against the upper end of the first elastic member is provided in the rod head body, and the lower end of the first elastic member abuts against the upper end of the sliding seat.

[0013] Preferably, the upper end of the lifting shaft is provided with a convex portion for abutting against the upper end of the second elastic member, and the sliding seat is provided with a second abutting portion for abutting against the lower end of the second elastic member.

[0014] Preferably, a first long hole for the guide shaft to pass through is formed on the rod head body, and a lower end of the first long hole forms a first limiting end for limiting the guide shaft from below;

[0015] The sliding seat is provided with a second long hole for the guide shaft to pass through, and the upper end of the second long hole forms a second limiting end for limiting the guide shaft from above.

[0016] Preferably, the first elastic member is a first spring, and the lifting shaft can be inserted upward into the first spring.

[0017] Preferably, the guide shaft sequentially penetrates the sliding seat and the rod head body along the radial direction of the lifting shaft.

[0018] Preferably, the cooling plug further comprises a fin sleeved on the rod body and a pressure plate for pressing the fin downward against the upper end of the rod head body.

[0019] Preferably, the cooling rod also includes a control unit, a temperature sensor and a heating resistor arranged on the sample stage, the temperature sensor and the heating resistor are electrically connected to the control unit respectively, and the control unit is used to control the heating power of the heating resistor according to the temperature signal fed back by the temperature sensor.

[0020] Preferably, the cooling plug further comprises a heat insulating member which is arranged on the rod body and has a wire arrangement hole.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention is used for the cooling rod in the low temperature environment, by respectively setting the pre-tightening mechanism and the locking mechanism in the rod head body and the sliding seat, when the cooling rod is pressed against the base downward, the rod head body can move downward relative to the sliding seat to compress the first elastic member, and then the cooling rod is rotated, the locking shaft descends under the action of the bottom surface of the cam, and drives the lifting shaft to descend so that the lifting shaft and the base are locked with each other, after the release, the rod head body rises relative to the sliding seat under the action of the first elastic member and presses against the guide shaft, so that the rod head body and the base are relatively locked. Since the sliding seat is clamped on the base, a better cooling surface is formed between the two, and the efficient mechanical cooling of the sample stage can be achieved through the cooling surface, shortening the cooling time; since the rod head body and the sliding seat are pressed against the base, the stability of the sample stage can be effectively improved, and the measurement accuracy of the sample can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a structural schematic diagram of a cooling plug according to a specific embodiment of the present invention;

[0023] Attached Figure 2 Schematic diagram of the structure of the club head assembly Figure 1 ;

[0024] Attached Figure 3 For attachment Figure 2 Schematic diagram of the cross-sectional structure along line AA;

[0025] Attached Figure 4 Schematic diagram of the structure of the club head assembly Figure 2 ;

[0026] Attached Figure 5 For attachment Figure 4 Schematic diagram of the cross-sectional structure along line BB;

[0027] Attached Figure 6 It is a schematic diagram of the cross-sectional structure of the mounting base.

[0028] Among them: 1. rod body; 2. sample table; 3. rod head body; 31. first abutment portion; 4. sliding seat; 41. second abutment portion; 5. base; 51. cam; 511. bottom surface of cam; 6. first elastic member; 7. lifting shaft; 71. convex portion; 8. second elastic member; 9. guide shaft; 10. locking shaft; 11. first long hole; 111. first limit end; 12. second long hole; 121. second limit end; 13. fin; 14. pressure plate; 15. mounting seat; 151. interface; 16. rotating drive member; 161. guide rod; 17. heat insulation member; 171. wiring hole. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with specific embodiments and drawings.

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "length", "inside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present invention, 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, and 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 the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0036] This embodiment provides a cooling rod for low temperature environment, which is inserted into a low temperature cavity, and the bottom end of the cooling rod is connected to the base 5. According to the test requirements (such as electrical transport test), a strong magnetic field can be set in the low temperature cavity.

[0037] See also Figure 1 As shown, the above-mentioned cooling rod for low temperature environment includes a hollow rod body 1, a rod head assembly connected to the lower end of the rod body 1, and a mounting seat 15 connected to the upper end of the rod body 1, wherein the rod head assembly is provided with a sample stage 2. The rod body 1 can rotate relative to the mounting seat 15 and the base 5 around its own axis.

[0038] The rod head assembly comprises a rod head body 3 which is hollow and connected to the bottom of the rod shaft 1, a sliding seat 4 which is hollow and can be movably inserted into the rod head body 3, a pre-tightening mechanism which is arranged in the rod head body 3 and used to pre-tighten the sliding seat 4, and a locking mechanism which is arranged in the sliding seat 4 and used to connect the base 5. In order to ensure the cooling effect, the rod shaft 1, the rod head body 3, the sliding seat 4, the sample table 2 and the base 5 are all made of copper. Among them, the pre-tightening mechanism is used to make the rod head body 3 and the sliding seat 4 elastically press against each other, and the locking mechanism is used to lock the sliding seat 4 on the base 5.

[0039] Since the liquid cold source is generally located at the base 5, and the sliding seat 4 is clamped on the base 5, a good cooling surface is formed between the two, through which efficient mechanical cooling of the sample stage 2 can be achieved, shortening the cooling time; since the rod head body 3 and the sliding seat 4 are pressed against the base 5, the stability of the sample stage 2 in the rod head body 3 can be effectively improved, thereby ensuring the measurement accuracy of the sample.

[0040] See also Figure 2-5 As shown, the lower end of the sliding seat 4 extends downward from the rod head body 3 and is used to press against the base 5 below. The pre-tightening mechanism includes a first elastic member 6 disposed in the rod head body 3 and used to be compressed when the sliding seat 4 moves upward relative to the rod head body 3.

[0041] In this embodiment, the rod head body 3 is provided with a first abutting portion 31 located below the sample stage 2 and used to abut against the upper end of the first elastic member 6, and the lower end of the first elastic member 6 is abutted against the upper end of the sliding seat 4. The first elastic member 6 is a first spring, and the first abutting portion 31 is annular; the upper end of the sliding seat 4 has an annular step structure, the inner side of the step structure is higher than the outer side, and the lower end of the first spring abuts against the lower annular surface on the outer side, and the step structure also serves as a limit for the first spring.

[0042] The locking mechanism includes a lifting shaft 7 which can be movably inserted into the sliding seat 4 up and down, a second elastic member 8 which is arranged in the sliding seat 4 and is used to be compressed when the lifting shaft 7 moves downward relative to the sliding seat 4, and a guide shaft 9 which is arranged on the lifting shaft 7 and sequentially penetrates the sliding seat 4 and the rod head body 3. The lifting shaft 7 can be inserted upward into the first spring.

[0043] In this embodiment, a protrusion 71 for abutting against the upper end of the second elastic member 8 is provided at the upper end of the lifting shaft 7. The protrusion 71 is annular and protrudes outward from the outer side of the lifting shaft 7. A second abutting portion 41 for abutting against the lower end of the second elastic member 8 is provided in the sliding seat 4. The second abutting portion 41 is also annular. The second elastic member 8 is a second spring sleeved on the lifting shaft 7.

[0044] The above-mentioned sliding seat 4 and rod head body 3 are used to limit the guide shaft 9 from the top and bottom respectively, and the rod head body 3 is used to drive the guide shaft 9 to rotate synchronously when rotating around its own axis. Among them, the rod head body 3 limits the guide shaft 9 to avoid the rod head body 3 and the sliding seat 4 from being disengaged from each other under the action of the first elastic member 6, and allows the two to be elastically pressed together, thereby ensuring the stability of the sliding seat 4; the sliding seat 4 limits the guide shaft 9 to avoid the lifting shaft 7 and the sliding seat 4 from being disengaged from each other under the action of the second elastic member 8, and allows the two to be elastically pressed together. When the sliding seat 4 is clamped on the base 5, the guide shaft 9 is pressed upward by the rod head body 3, which effectively ensures the stability of the sample stage 2 in the rod head body 3 and ensures the measurement accuracy of the sample.

[0045] The first elastic member 6, the guide shaft 9 and the second elastic member 8 are arranged in order from top to bottom. In this embodiment, the guide shaft 9 penetrates the sliding seat 4 and the rod head body 3 in the radial direction of the lifting shaft 7, and the guide shaft 9 and the lifting shaft 7 are integrally formed.

[0046] The rod head body 3 is provided with a first long hole 11 for the guide shaft 9 to pass through, and the lower end of the first long hole 11 forms a first limiting end 111 for limiting the guide shaft 9 from below. In this embodiment, the upper end of the first long hole 11 is open; the sliding seat 4 is provided with a second long hole 12 for the guide shaft 9 to pass through, and the upper end of the second long hole 12 forms a second limiting end 121 for limiting the guide shaft 9 from above. The guide shaft 9 can be lifted and arranged in the first long hole 11 to guide and limit the relative movement between the rod head body 3 and the sliding seat 4; the guide shaft 9 can be lifted and arranged in the second long hole 12 to guide and limit the relative movement between the lifting shaft 7 and the sliding seat 4. When the sliding seat 4 is locked on the base 5, the guide shaft 9 is pressed upward by the first limiting end 111, which effectively improves the stability of the sample stage 2.

[0047] The lower end of the lifting shaft 7 extends downward from the sliding seat 4, and the locking mechanism further includes a locking shaft 10 connected to the lower end of the lifting shaft 7 and used to penetrate downward into the base 5. The base 5 is provided with a cam 51 for the locking shaft 10 to pass downward, and the cam 51 has a cam bottom surface 511 for driving the locking shaft 10 to descend when the locking shaft 10 rotates around the axis of the lifting shaft 7, and the cam bottom surface 511 is arranged obliquely in the up-down direction. The second elastic member 8 is used to provide a locking force to lock the locking shaft 10 upward on the cam bottom surface 511, so that a better cold conduction surface is formed between the bottom of the sliding seat 4 and the top of the base 5.

[0048] In this embodiment, the locking shaft 10 is arranged along the radial direction of the lifting shaft 7 and the two are integrally formed.

[0049] The above-mentioned cooling rod for low-temperature environment also includes fins 13 sleeved on the rod body 1 and a pressure plate 14 for pressing the fins 13 downward against the upper end of the rod head body 3. The fins 13 are used to conduct the cold energy of the low-temperature gas in the low-temperature environment.

[0050] The above-mentioned cooling rod for low temperature environment also includes a control unit, a temperature sensor and a heating resistor provided on the sample stage 2, and the temperature sensor and the heating resistor are electrically connected to the control unit respectively. In this embodiment, the control unit is a temperature controller, which is used to control the heating power of the heating resistor according to the temperature signal fed back by the temperature sensor, so as to heat the sample stage 2 according to the measurement requirements.

[0051] See also Figure 6As shown, the above-mentioned mounting seat 15 is hollow, and the cold-conducting plug for low-temperature environment also includes a plurality of interfaces 151 respectively opened on the mounting seat 15, and the rod 1 can be rotatably arranged in the mounting seat 15 around its own axis. One of the interfaces 151 is arranged at the top of the mounting seat 15 and connected to the rotating driving member 16, and the rotating driving member 16 is connected to the top of the rod 1 through the guide rod 161 to drive the rod 1 to rotate relative to the mounting seat 15. At least one of the interfaces 151 is used for wiring, and at least one of the interfaces 151 is used to vacuum the mounting seat 15 and the rod 1 as a whole; the rod 1 is also provided with a heat insulating member 17 with a wiring hole 171.

[0052] The working process of this embodiment is described in detail below:

[0053] In the initial state, the upper side of the guide shaft 9 is pressed against the second limit end 121, and the lower side of the guide shaft 9 is pressed against the first limit end 111;

[0054] The base 5 is fixed in a low temperature environment, and the cooling rod is inserted, and then the rotating driving member 16 is pressed downward to make the sliding seat 4 close to the base 5, and the locking shaft 10 passes through the cam 51 downward. At this time, the rod head body 3 moves downward relative to the sliding seat 4 to compress the first elastic member 6, and the first limit end 111 is disengaged from the guide shaft 9 downward;

[0055] Then, the rotary drive member 16 is rotated, and the locking shaft 10 is driven down by the cam bottom surface 511, and drives the lifting shaft 7 to descend, so that the locking shaft 10 and the base 5 are locked with each other, and the locking force is provided by the second elastic member 8, and the guide shaft 9 descends and disengages from the second limit end 121;

[0056] After that, the rotary driving member 16 is released, and the rod head body 3 rises relative to the sliding seat 4 under the action of the first elastic member 6, and the first limit end 111 presses against the guide shaft 9 upward and then stops, at which time the rod head body 3 and the base 5 are relatively locked.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling rod for use in a low temperature environment, characterized in that: The cooling rod comprises a hollow rod body, a rod head assembly connected to the lower end of the rod body, and a sample stage arranged in the rod head assembly; The rod head assembly includes a rod head body that is hollow, a sliding seat that is hollow and can be movably inserted into the rod head body, a pre-tightening mechanism that is arranged in the rod head body and used to pre-tighten the sliding seat, and a locking mechanism that is arranged in the sliding seat and used to connect to a base, and the lower end of the sliding seat extends downwardly from the rod head body; The pre-tightening mechanism comprises a first elastic member disposed in the rod head body and configured to be compressed when the sliding seat moves upward relative to the rod head body; The locking mechanism comprises a lifting shaft movably arranged in the sliding seat, a second elastic member arranged in the sliding seat and used to be compressed when the lifting shaft moves downward relative to the sliding seat, and a guide shaft arranged on the lifting shaft and sequentially inserted into the sliding seat and the rod head body, the sliding seat and the rod head body are respectively used to limit the guide shaft from the top and the bottom, and the rod head body is used to drive the guide shaft to rotate synchronously when rotating around its own axis. The lower end of the lifting shaft extends downwardly out of the sliding seat, and the locking mechanism further comprises a locking shaft connected to the lower end of the lifting shaft and used to penetrate downward into the base, and a cam is provided in the base for being passed downward by the locking shaft, and the cam has a cam bottom surface for driving the locking shaft to descend when the locking shaft rotates around the axis of the lifting shaft; The rod head body is provided with a first abutting portion located below the sample stage and used to abut against the upper end of the first elastic member, and the lower end of the first elastic member abuts against the upper end of the sliding seat; The upper end of the lifting shaft is provided with a convex portion for abutting against the upper end of the second elastic member, and the sliding seat is provided with a second abutting portion for abutting against the lower end of the second elastic member.

2. The cooling plug for low temperature environment according to claim 1, characterized in that: The first elastic member, the guide shaft and the second elastic member are arranged in sequence from top to bottom.

3. The cooling plug for low temperature environment according to claim 1, characterized in that: The rod head body is provided with a first long hole for the guide shaft to pass through, and the lower end of the first long hole forms a first limiting end for limiting the guide shaft from below; The sliding seat is provided with a second long hole for the guide shaft to pass through, and the upper end of the second long hole forms a second limiting end for limiting the guide shaft from above.

4. The cooling plug for low temperature environment according to claim 1, characterized in that: The first elastic member is a first spring, and the lifting shaft can be upwardly penetrated in the first spring.

5. The cooling plug for low temperature environment according to claim 1, characterized in that: The guide shaft sequentially penetrates the sliding seat and the rod head body along the radial direction of the lifting shaft.

6. The cooling plug for low temperature environment according to claim 1, characterized in that: The cooling plug also includes a fin sleeved on the rod body and a pressure plate used to press the fin downward against the upper end of the rod head body.

7. The cooling plug for low temperature environment according to claim 1, characterized in that: The cooling rod also includes a control unit, a temperature sensor and a heating resistor arranged on the sample stage, the temperature sensor and the heating resistor are electrically connected to the control unit respectively, and the control unit is used to control the heating power of the heating resistor according to the temperature signal fed back by the temperature sensor.

8. The cooling plug for low temperature environment according to claim 1, characterized in that: The cooling plug rod also includes a heat insulating member which is arranged on the rod body and has a wire arrangement hole.

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