Variable temperature hall effect measurement fixture

Abstract

The present application relates to a kind of variable temperature Hall effect measurement clamps, including clamp body, one end of the clamp body is provided with rectangular plate, four adjusting components are uniformly provided on rectangular plate, adjusting component includes clamping plate, locking ring, adjusting groove, adjusting column and limit ring, four adjusting columns are rotatably connected on the clamp body, the top of the adjusting column is provided with locking ring.Low-temperature compensation mechanism: through low-temperature compensation component, the characteristics of ZrW2O8 low-temperature volume expansion material and perfluoroether rubber are used to realize expansion compensation at low temperature, fill the gap generated by other components cold shrink, maintain the locking pressure of clamping plate and adjusting column, ensure clamping stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of measurement fixtures, in particular to a variable-temperature Hall effect measurement fixture. BACKGROUND

[0002] Hall effect measurement fixtures are important devices for testing the electrical properties of materials, widely used in the fields of physics, materials science and semiconductor research. Traditional Hall effect measurement fixtures can usually stably clamp samples and complete tests at room temperature, but with the increasing demand for low-temperature testing, such as at liquid nitrogen temperature (about -195.8°C) and other extreme conditions, existing fixtures have exposed several problems. First, in a low-temperature environment, the metal or non-metal components of the fixture may cause the clamping force to decrease due to thermal expansion and contraction, causing the sample to loosen and affecting the test accuracy. Second, the clamping force adjustment mechanism of traditional fixtures is relatively complex, relying on manual or mechanical adjustment, which is low in operation efficiency and difficult to adapt to dynamic changes in variable-temperature environments. In addition, the material selection of existing fixtures usually does not fully consider the performance maintenance in low-temperature environments, such as loss of elasticity or deformation problems, resulting in insufficient reliability of the fixture at extreme temperatures, thus a variable-temperature Hall effect measurement fixture is proposed. SUMMARY

[0003] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0004] In view of the following technical problems in the prior art: insufficient clamping stability in low-temperature environments: traditional Hall effect measurement fixtures may have reduced pressure between the clamping plates and other components due to the thermal expansion and contraction characteristics of the materials in a low-temperature environment, resulting in loose clamping and affecting the stability and accuracy of sample testing;

[0005] Clamping force adjustment is complex: the clamping force adjustment mechanism of existing fixtures is complex, making it difficult to achieve rapid and accurate clamping and release operations, especially in variable-temperature environments, lacking efficient transmission and adjustment mechanisms;

[0006] Insufficient material adaptability in low-temperature environments: in a low-temperature environment, some components of conventional fixtures may lose elasticity or deform, resulting in fixture malfunction or performance degradation;

[0007] Limited adaptability to test environments: traditional fixtures lack comprehensive design for variable-temperature environments and are difficult to maintain stable test interfaces in extreme low-temperature conditions.

[0008] To solve the above technical problems, the application provides the following technical scheme: a variable-temperature Hall effect measurement clamp, comprising a clamp main body, one end of the clamp main body is provided with a rectangular plate, four adjusting assemblies are uniformly arranged on the rectangular plate, the adjusting assembly comprises a clamping plate, a locking pressure ring, an adjusting groove, an adjusting column and a limiting ring, four adjusting columns are rotationally connected to the clamp main body, and the top of the adjusting column is provided with a locking pressure ring.

[0009] The adjusting groove is formed in the clamping plate, the bottom of the adjusting column is provided with a limiting ring, the clamping plate is located between the limiting ring and the locking pressure ring, and the adjusting column passes through the adjusting groove.

[0010] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the adjusting assembly further comprises a ring-shaped limiting table and a locking block, the top end of the adjusting column is provided with a locking block, the inside of the locking pressure ring is provided with a ring-shaped limiting table, and the inner diameter of the ring-shaped limiting table is smaller than the diameter of the locking block.

[0011] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the material of the locking block is XM-19 austenitic stainless steel, the material of the ring-shaped limiting table is Ni36 alloy, and the upper end of the inner ring of the ring-shaped limiting table is provided with a round corner.

[0012] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the middle part of the adjusting column is sleeved with an extrusion ring and a spring washer, the lower side of the extrusion ring abuts against the spring washer, the bottom end of the spring washer abuts against the limiting ring, and the extrusion ring extrudes the lower side of the clamping plate.

[0013] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the inside of the rectangular plate is provided with a working cavity, the inside of the working cavity is provided with a transmission mechanism, the transmission mechanism comprises gear one, gear two, a synchronous pulley, a synchronous belt and a pneumatic assembly, two gear ones are rotationally connected to the two sides in the working cavity, the two gear ones on the same side of the working cavity are meshed with each other, a synchronous pulley is arranged on one gear one on one side of the working cavity, gear two is rotationally connected to the other side of the working cavity and is meshed with one gear one, one end of the gear two is connected with the pneumatic assembly, the other end of the gear two is provided with a synchronous pulley, the two synchronous pulleys are connected through a synchronous belt, the synchronous pulleys are engaged with the synchronous belt, and the gear one is coaxially connected with the bottom end of the adjusting column.

[0014] The transmission mechanism further comprises a mechanical box, and the pneumatic assembly comprises a pneumatic cavity, a piston, a return spring, a rubber sealing ring, a connecting rod one, a connecting rod two, a connecting rod three, a rotating table and a transmission column; the interior of the mechanical box is provided with the pneumatic cavity; the outer side of the piston is sleeved with the rubber sealing ring; the outer periphery of the rubber sealing ring is movably connected with the inner wall of the pneumatic cavity; the piston is provided with the connecting rod one; the connecting rod one is rotatably connected with one end of the connecting rod two; the other end of the connecting rod two is rotatably connected with the connecting rod three; the outer side of the rotating table is fixedly connected with the connecting rod three; the middle part of the rotating table is provided with the transmission column; the transmission column is rotatably connected with the mechanical box; and the transmission column is connected with the center shaft of the gear two.

[0015] The middle part of the pneumatic cavity is provided with a fixed table; the fixed table is connected with the piston through the return spring; the piston stroke is designed to be 15-30 mm; and the return force generated by the spring at the maximum stroke needs to be matched with the maximum driving force of the pneumatic cavity.

[0016] When the elastic coefficient of the return spring is 5 N / mm, the piston is located at the stroke position of 30 mm, and the return force of the return spring is 150 N; when the elastic coefficient of the return spring is 15 N / mm, the piston is located at the stroke position of 20 mm, and the return force of the return spring is 300 N; both can realize the rapid reset of the piston and do not produce impact; the maximum driving force corresponds to the air pressure of 0.4-0.8 MPa; when the air pressure is 0.6 MPa, the corresponding thrust is 220 N; the tensile strength of XM-19 austenitic stainless steel at minus 196℃ is greater than or equal to 800 MPa; and the linear expansion coefficient of Ni36 alloy is less than or equal to 1.5*10-6 / ℃.

[0017] The clamping plate is provided with a probe; the probe is made of beryllium bronze material; the probe is part of a variable-temperature Hall effect tester; the probe can directly contact the sample while the clamping plate clamps the sample; a test interface is selected to be a low-temperature micro rectangular connector matched with the original factory of the tester, so as to realize seamless docking with a special low-temperature cable of the tester.

[0018] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the top of the adjusting column is provided with a low-temperature compensation assembly; and the clamping plate is located between the low-temperature compensation assembly and the extrusion ring.

[0019] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the low-temperature compensation assembly comprises an annular extrusion cylinder one, an annular extrusion cylinder two, an inner cylinder, an elastic connecting sleeve, a bladder, a structure ball one and a structure ball two; the material of the structure ball one is perfluoroether rubber which can maintain good elasticity at low temperature; the material of the structure ball two is a low-temperature volume expansion material including ZrW2O8; the diameter of the structure ball two is more than three times the diameter of the structure ball one; the particle size of the structure ball two is 50-200 μm; and the filling rate of the bladder is 60%-70%.

[0020] The top of the annular extrusion cylinder two is provided with an annular groove, the inner side of the annular groove is movably connected with an annular extrusion cylinder one, two inner cylinders with different sizes are arranged in the annular groove, the inner cylinder is connected with the annular extrusion cylinder one, an elastic connecting sleeve is arranged between the top end of the inner cylinder and the inner top wall of the annular extrusion cylinder one, a rubber bag is arranged in the inner cylinder, a plurality of structure balls one and structure balls two are arranged in the rubber bag, the structure balls one and structure balls two make the rubber bag in an egg shape, the top end of the rubber bag abuts against the bottom end of the annular extrusion cylinder one and the annular extrusion cylinder two;

[0021] When the temperature is reduced to the temperature of liquid nitrogen, the structure balls two are expanded in volume, the volume of the rubber bag is increased, and the annular extrusion cylinder one and the annular extrusion cylinder two are pushed to move relatively.

[0022] The annular extrusion cylinder one moves out of the annular extrusion cylinder two, so that the extrusion locking ring and the clamping plate are extruded, and the pressure between the clamping plate and the extrusion ring is maintained or increased. The low-temperature compensation assembly fills the gap generated by the shrinkage of other structures due to the reduction of temperature by expansion, ensures the relative locking of the clamping plate and the adjusting column, and prevents the clamping from being loosened, and the other structures include the locking ring, the ring-shaped limiting table, the extrusion ring and the spring washer.

[0023] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, one end of the clamp body is provided with a middle column, the middle column is provided with a cover plate, the cover plate is connected with a working cylinder, and the front surface of the working cylinder is provided with a test interface and a temperature control interface.

[0024] As a preferred technical scheme of the variable-temperature Hall effect measurement clamp, the clamp body is provided with a heating resistor and a temperature sensor.

[0025] The variable-temperature Hall effect measurement clamp has the following beneficial effects: low-temperature compensation mechanism: through the low-temperature compensation assembly, the low-temperature compensation assembly includes structure balls two and structure balls one, the low-temperature volume expansion characteristics of ZrW2O8 and the low-temperature elasticity of perfluoroether rubber are utilized to realize expansion compensation at low temperature, fill the gap generated by the shrinkage of other components, maintain the locking pressure of the clamping plate and the adjusting column, and ensure the clamping stability;

[0026] Efficient transmission and adjustment: the pneumatic assembly and the gear transmission mechanism are adopted, the piston is driven through the pneumatic cavity, the clamping plate is accurately approached or moved away, the clamping force adjustment operation is simplified, and the efficiency of clamping and releasing is improved.

[0027] Material optimization: XM-19 austenitic stainless steel and Ni36 alloy are selected, perfluoroether rubber and ZrW2O8 are combined, and the durability, elasticity and stability of the clamp in a low-temperature environment are ensured.

[0028] Variable-temperature adaptability: by arranging the heating resistor, the temperature sensor, the test interface and the temperature control interface, the clamp can adapt to a variable-temperature environment, especially a low temperature, and the accuracy and reliability of the Hall effect test are ensured. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of the working cavity of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the mechanical box of the present invention;

[0033] Figure 4 This is a schematic diagram of the internal structure of the low-temperature compensation component of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the spring washer of the present invention;

[0035] Figure 6 This is a schematic diagram showing the positional relationship between gear one, gear two, and the synchronous belt pulley of the present invention;

[0036] Figure 7 This is a schematic diagram showing the positional relationship between the inner cylinder and the annular extrusion cylinder II of the present invention;

[0037] Figure 8 This is a schematic diagram of the front structure of the present invention.

[0038] Reference numerals: 1. Fixture body; 2. Clamping plate; 3. Locking pressure ring; 4. Adjustment groove; 5. Sample stage; 6. Locking block; 7. Adjustment column; 8. Annular extrusion cylinder one; 9. Annular extrusion cylinder two; 10. Extrusion ring; 11. Spring washer; 12. Gear one; 13. Gear two; 14. Synchronous pulley; 15. Working chamber; 16. Synchronous belt; 17. Mechanical box; 19. Elastic connecting sleeve; 20. Leather bag; 21. Structural ball one; 22. Structural ball two; 23. Limiting ring; 24. Circular limiting platform; 25. Pneumatic chamber; 26. Piston; 27. Return spring; 28. Rubber sealing ring; 29. ​​Connecting rod one; 30. Connecting rod two; 31. Connecting rod three; 32. Rotary table; 33. Transmission column; 34. Inner cylinder; 36. Intermediate column; 37. Cover plate; 38. Working cylinder; 39. Test interface; 40. Temperature control interface. Detailed Implementation

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0042] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0043] like Figures 1-8 As shown, the present invention proposes a fixture for measuring the variable temperature Hall effect, including a fixture body 1. A rectangular plate is provided at one end of the fixture body 1. Four adjustment components are evenly arranged on the rectangular plate. The adjustment components include a clamping plate 2, a locking ring 3, an adjustment groove 4, an adjustment post 7, and a limiting ring 23. Four adjustment posts 7 are rotatably connected to the fixture body 1. A locking ring 3 is provided at the top of the adjustment post 7.

[0044] A sample stage 5 is provided on the rectangular plate;

[0045] The clamping plate 2 has an adjustment groove 4, and the bottom of the adjustment column 7 is provided with a limit ring 23. The clamping plate 2 is located between the limit ring 23 and the locking pressure ring 3, and the adjustment column 7 passes through the adjustment groove 4.

[0046] The adjustment assembly also includes a ring-shaped limiting platform 24 and a locking block 6. The top of the adjustment column 7 is provided with a locking block 6, and the inside of the locking pressure ring 3 is provided with a ring-shaped limiting platform 24. The inner diameter of the ring-shaped limiting platform 24 is smaller than the diameter of the locking block 6.

[0047] The locking block 6 is made of XM-19 austenitic stainless steel, the ring-shaped limiting platform 24 is made of Ni36 alloy, and the upper end of the inner ring of the ring-shaped limiting platform 24 is provided with rounded corners.

[0048] The middle part of the adjusting column 7 is sleeved with an extrusion ring 10 and a spring washer 11, the lower side of the extrusion ring 10 abuts against the spring washer 11, the bottom end of the spring washer 11 abuts against a limiting ring 23, and the extrusion ring 10 extrudes the lower side of the clamping plate 2.

[0049] The inside of the rectangular plate is provided with a working cavity 15, the inside of the working cavity 15 is provided with a transmission mechanism, the transmission mechanism comprises a gear one 12, a gear two 13, a synchronous pulley 14, a synchronous belt 16 and a pneumatic assembly, two gear ones 12 are rotationally connected to the two sides in the working cavity 15, the two gear ones 12 on the same side of the working cavity 15 are engaged with each other, the gear one 12 on one side of the working cavity 15 is provided with the synchronous pulley 14, the other side of the working cavity 15 is rotationally connected with the gear two 13, the gear two 13 is engaged with the gear one 12, one end of the gear two 13 is connected with the pneumatic assembly, the other end of the gear two 13 is provided with the synchronous pulley 14, the two synchronous pulleys 14 are connected through the synchronous belt 16, the synchronous pulley 14 is engaged with the synchronous belt 16, and the gear one 12 is coaxially connected with the bottom end of the adjusting column 7.

[0050] The transmission mechanism further comprises a mechanical box 17, and the pneumatic assembly comprises a pneumatic cavity 25, a piston 26, a return spring 27, a rubber sealing ring 28, a connecting rod one 29, a connecting rod two 30, a connecting rod three 31, a rotating table 32 and a transmission column 33, the inside of the mechanical box 17 is provided with the pneumatic cavity 25, the outside of the piston 26 is sleeved with the rubber sealing ring 28, the periphery of the rubber sealing ring 28 is movably connected with the inner wall of the pneumatic cavity 25, the piston 26 is provided with the connecting rod one 29, the connecting rod one 29 is rotationally connected with one end of the connecting rod two 30, the other end of the connecting rod two 30 is rotationally connected with the connecting rod three 31, the outside of the rotating table 32 is fixedly connected with the connecting rod three 31, the middle part of the rotating table 32 is provided with the transmission column 33, the transmission column 33 is rotationally connected with the mechanical box 17, and the transmission column 33 is connected with the central shaft of the gear two 13.

[0051] The middle part of the pneumatic cavity 25 is provided with a fixed table, and the fixed table is connected with the piston 26 through the return spring 27.

[0052] The clamping plate 2 is provided with a probe, the probe is made of beryllium bronze material, the probe is part of a variable-temperature Hall effect tester, and the probe can directly contact the sample while the clamping plate 2 clamps the sample.

[0053] The clamping plate 2 is located above the sample table 5 and is arranged around the sample table 5.

[0054] The top of the adjusting column 7 is provided with a low-temperature compensation assembly, and the clamping plate 2 is located between the low-temperature compensation assembly and the extrusion ring 10.

[0055] The low-temperature compensation assembly comprises annular extrusion cylinder 1, annular extrusion cylinder 2, inner cylinder 3, elastic connecting sleeve 4, bladder 5, structural ball 1 and structural ball 2, the material of the structural ball 1 is perfluoroether rubber which can maintain good elasticity at low temperature, the material of the structural ball 2 is low-temperature volume expansion material including ZrW2O8, the diameter of the structural ball 2 is more than three times of the diameter of the structural ball 1;

[0056] The top of the annular extrusion cylinder 2 is provided with an annular groove, the annular groove is movably connected with the annular extrusion cylinder 1, two inner cylinders 3 with different sizes are arranged in the annular groove, the inner cylinder 3 is connected with the annular extrusion cylinder 1, the elastic connecting sleeve 4 is arranged between the top end of the inner cylinder 3 and the inner top wall of the annular extrusion cylinder 1, the bladder 5 is arranged in the inner cylinder 3, the structural ball 1 and the structural ball 2 are arranged in the bladder 5, the structural ball 1 and the structural ball 2 make the bladder 5 in the shape of an egg, the top end of the bladder 5 abuts against the bottom end of the annular extrusion cylinder 1 and the annular extrusion cylinder 2;

[0057] When the temperature is reduced to the temperature of liquid nitrogen, the structural ball 2 is expanded in volume, the volume of the bladder 5 is increased, and the annular extrusion cylinder 1 and the annular extrusion cylinder 2 are relatively moved. The annular extrusion cylinder 1 moves out of the annular extrusion cylinder 2, thereby extruding the locking pressure ring 3 and the clamping plate 2, and the pressure between the clamping plate 2 and the extrusion ring 10 is maintained or increased. The low-temperature compensation assembly fills the gap generated by the shrinkage of other structures including the locking pressure ring 3, the annular limiting table 24, the extrusion ring 10 and the spring washer 11 by expansion, and ensures that the clamping plate 2 is relatively locked with the adjusting column 7, so as to prevent the clamping from being loosened.

[0058] The material of the rubber sealing ring 28 is perfluoroether rubber FFKM, and the low-temperature sealing performance parameter is that the leakage rate is less than or equal to 1*10 -7 Pa·m 3 / s.

[0059] One end of the clamp body 1 is provided with a middle column 36, the middle column 36 is provided with a cover plate 37, the cover plate 37 is connected with a working cylinder 38, the front surface of the working cylinder 38 is provided with a test interface 39 and a temperature control interface 40.

[0060] The clamp body 1 is provided with a heating resistor and a temperature sensor.

[0061] The annular cavity space is formed between the two inner cylinders 3, and the two inner cylinders 3 are connected with the two vertical walls of the inner cavity of the annular extrusion cylinder 1 respectively.

[0062] The embodiment is specifically: including the following steps: supply air to the pneumatic cavity 25 through the trachea, push the piston 26 to move, compress the return spring 27; Then the piston 26 drives the connecting rod one 29, the connecting rod two 30 and the connecting rod three 31, makes the rotating table 32 and the transmission column 33 rotate; The transmission column 33 drives the gear two 13 and the synchronous pulley 14 to rotate, and then drives the gear one 12 to rotate reversely; Through the synchronous belt 16, the other side gear one 12 is synchronously rotated, the rotating direction of the same side gear one 12 is realized opposite;

[0063] The sample is corresponding to the sample table 5, the gear one 12 drives the adjusting column 7, the clamping plate 2 is close to each other or away from each other, and the sample at the sample table 5 is clamped or released; The clamp body 1 is placed in a low temperature environment, and the clamp body 1 enters the low temperature environment with the sample.

[0064] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure, without undue experimentation.

[0065] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalent, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A variable temperature Hall effect measurement fixture, characterized by: The utility model provides a kind of adjustable clamp, including clamp body (1), one end of the clamp body (1) is provided with rectangular plate, four adjusting assemblies are evenly provided on rectangular plate, adjusting assembly includes clamping plate (2), locking ring (3), adjusting groove (4), adjusting column (7) and limit ring (23), the top of the adjusting column (7) is provided with locking ring (3);Clamping plate (2) is provided with adjusting groove (4), the bottom of adjusting column (7) is provided with limit ring (23), clamping plate (2) is between limit ring (23) and locking ring (3), adjusting column (7) passes through adjusting groove (4);Rectangular plate is internally provided with working cavity (15), the inside of working cavity (15) is provided with transmission mechanism, the transmission mechanism includes gear one (12), gear two (13), synchronous pulley (14), synchronous belt (16) and pneumatic assembly, two gear one (12) are rotatably connected in the both sides in the working cavity (15), two gear one (12) on the same side of working cavity (15) are engaged with each other, one gear one (12) on the side of working cavity (15) is provided with synchronous pulley (14), the other side of working cavity (15) is rotatably connected with gear two (13), gear two (13) is engaged with one gear one (12), one end of gear two (13) is connected with pneumatic assembly, the other end of gear two (13) is provided with synchronous pulley (14), two synchronous pulleys (14) are connected by synchronous belt (16), synchronous pulley (14) is engaged with synchronous belt (16), gear one (12) is coaxially connected with the bottom end of adjusting column (7);The transmission mechanism further includes mechanical box (17), the pneumatic assembly includes pneumatic cavity (25), piston (26), return spring (27), rubber sealing ring (28), connecting rod one (29), connecting rod two (30), connecting rod three (31), rotary table (32) and transmission column (33), the inside of mechanical box (17) is provided with pneumatic cavity (25), the outside of piston (26) is sleeved with rubber sealing ring (28), the periphery of rubber sealing ring (28) is movably connected with the inner wall of pneumatic cavity (25), connecting rod one (29) is arranged on piston (26), connecting rod one (29) is rotatably connected with one end of connecting rod two (30), the outside of rotary table (32) is fixedly connected with connecting rod three (31), the other end of connecting rod two (30) is rotatably connected with connecting rod three (31), the middle of rotary table (32) is provided with transmission column (33), transmission column (33) is rotatably connected with mechanical box (17), transmission column (33) is connected with the center axis of gear two (13);The top of the adjusting column (7) is provided with low-temperature compensation assembly, clamping plate (2) is between low-temperature compensation assembly and extrusion ring (10).The low-temperature compensation assembly comprises a ring extrusion cylinder I (8), a ring extrusion cylinder II (9), an inner cylinder (34), an elastic connecting sleeve (19), a bladder (20), a structure ball I (21) and a structure ball II (22), the material of the structure ball II (22) is a low-temperature volume expansion material including ZrW2O8, the diameter of the structure ball II (22) is more than three times of the diameter of the structure ball I (21); a ring groove is formed at the top of the ring extrusion cylinder II (9), the ring groove movably inserts the ring extrusion cylinder I (8) at the inner side, two inner cylinders (34) with different sizes are arranged in the ring groove, the inner cylinder (34) is inserted with the ring extrusion cylinder I (8), the elastic connecting sleeve (19) is arranged between the top end of the inner cylinder (34) and the inner top wall of the ring extrusion cylinder I (8), the inner side of the inner cylinder (34) contains the bladder (20), the bladder (20) contains a plurality of structure ball I (21) and structure ball II (22), the structure ball I (21) and the structure ball II (22) make the bladder (20) in an egg shape, the top end of the bladder (20) abuts against the bottom end of the ring extrusion cylinder I (8) and the ring extrusion cylinder II (9).

2. The variable temperature Hall effect measurement fixture of claim 1, wherein: The adjusting assembly further comprises a ring-shaped limiting platform (24) and a locking block (6), the top end of the adjusting column (7) is provided with the locking block (6), the inside of the locking ring (3) is provided with the ring-shaped limiting platform (24), and the inner diameter of the ring-shaped limiting platform (24) is smaller than the diameter of the locking block (6).

3. A variable temperature Hall effect measurement fixture according to claim 2, wherein: The material of the locking block (6) is XM-19 austenitic stainless steel, the material of the ring-shaped limiting platform (24) is Ni36 alloy, and the upper end of the inner ring of the ring-shaped limiting platform (24) is provided with a round corner.

4. The variable temperature Hall effect measurement fixture of claim 1, wherein: The middle part of the adjusting column (7) is sleeved with an extrusion ring (10) and a spring washer (11), the lower side of the extrusion ring (10) abuts against the spring washer (11), the bottom end of the spring washer (11) abuts against a limiting ring (23), and the extrusion ring (10) extrudes the lower side of the clamping plate (2).

5. The variable temperature Hall effect measurement fixture of claim 1, wherein: One end of the clamp body (1) is provided with an intermediate column (36), the intermediate column (36) is provided with a cover plate (37), and the cover plate (37) is connected with a working cylinder (38).

6. The variable temperature Hall effect measurement fixture of claim 2, wherein: The clamp body (1) is provided with a heating resistor and a temperature sensor.

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