Variable-temperature Hall effect measuring clamp

Abstract

The invention relates to a variable temperature Hall effect measuring clamp which comprises a clamp body, a rectangular plate is arranged at one end of the clamp body, four adjusting assemblies are evenly arranged on the rectangular plate, each adjusting assembly comprises a clamping plate, a locking pressing ring, an adjusting groove, adjusting columns and a limiting ring, and the four adjusting columns are rotationally connected to the clamp body. And a locking pressing ring is arranged at the top of the adjusting column. According to the low-temperature compensation mechanism, expansion compensation is achieved at the low temperature through the low-temperature compensation assembly by means of the characteristics of ZrW2O8 low-temperature volume expansion materials and perfluoroether rubber, gaps generated by cold contraction of other assemblies are filled, the locking pressure of the clamping plate and the adjusting column is kept, and the clamping stability is ensured.

Description

Technical Field

[0001] This invention relates to the field of measuring fixtures, specifically a variable-temperature Hall effect measuring fixture. Background Technology

[0002] Hall effect measurement fixtures are important devices for testing the electrical properties of materials and are widely used in physics, materials science, and semiconductor research. Traditional Hall effect measurement fixtures can stably hold samples and complete tests at room temperature. However, with the increasing demand for low-temperature testing, such as at extreme conditions like liquid nitrogen temperatures (approximately -195.8°C), existing fixtures have revealed several problems. First, at low temperatures, the metal or non-metal components of the fixture may experience a decrease in clamping force due to thermal expansion and contraction, causing sample loosening and affecting test accuracy. Second, the clamping force adjustment mechanism of traditional fixtures is relatively complex, relying on manual or mechanical adjustments, resulting in low operational efficiency and difficulty in adapting to dynamic changes in temperature environments. Furthermore, the material selection of existing fixtures often does not fully consider performance maintenance at low temperatures, such as elasticity loss or deformation, leading to insufficient reliability of the fixture at extreme temperatures. Therefore, a variable-temperature Hall effect measurement fixture is proposed. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] Given the following technical problems in the existing technology: insufficient clamping stability in low temperature environment: In low temperature environment, due to the thermal expansion and contraction characteristics of materials, the pressure between the clamping plate and other components of the traditional Hall effect measurement fixture may decrease, resulting in loosening of the clamping and affecting the stability and accuracy of sample testing; The clamping force adjustment is complex: the existing clamping force adjustment mechanism is complex, making it difficult to achieve fast and accurate clamping and release operations, especially in variable temperature environments, where there is a lack of efficient transmission and adjustment mechanisms; Insufficient material adaptability in low-temperature environments: In low-temperature environments, some component materials of conventional fixtures may lose elasticity or deform, leading to fixture malfunction or performance degradation. Limited adaptability to testing environments: Traditional fixtures lack comprehensive design for variable temperature environments, making it difficult to maintain the stability of the test interface under extreme low temperature conditions.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a variable temperature Hall effect measuring fixture, comprising a fixture body, a rectangular plate provided at one end of the fixture body, four adjustment components evenly arranged on the rectangular plate, the adjustment components including a clamping plate, a locking pressure ring, an adjustment groove, an adjustment post and a limiting ring, four adjustment posts rotatably connected to the fixture body, and a locking pressure ring provided at the top of the adjustment post; The clamping plate has an adjustment groove, and the bottom of the adjustment column is provided with a limit ring. The clamping plate is located between the limit ring and the locking pressure ring, and the adjustment column passes through the adjustment groove.

[0006] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, the adjustment assembly further includes a ring-shaped limiting stage and a locking block. The top of the adjustment column is provided with a locking block, and the inside of the locking pressure ring is provided with a ring-shaped limiting stage, the inner diameter of which is smaller than the diameter of the locking block.

[0007] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, the locking block is made of XM-19 austenitic stainless steel, the ring-shaped limiting stage is made of Ni36 alloy, and the upper end of the inner ring of the ring-shaped limiting stage is provided with rounded corners.

[0008] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, a compression ring and a spring washer are fitted in the middle of the adjusting column. The lower side of the compression ring abuts against the spring washer, and the bottom end of the spring washer abuts against the limiting ring. The compression ring compresses the lower side of the clamping plate.

[0009] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, a rectangular plate has a working cavity inside, and a transmission mechanism is provided on the inner side of the working cavity. The transmission mechanism includes a first gear, a second gear, a synchronous pulley, a synchronous belt, and a pneumatic assembly. Two first gears are rotatably connected to both sides of the working cavity, and the two first gears on the same side of the working cavity mesh with each other. A synchronous pulley is provided on one of the first gears on one side of the working cavity. A second gear is rotatably connected to the other side of the working cavity, and the second gear meshes with one of the first gears. One end of the second gear is connected to the pneumatic assembly, and the other end of the second gear is provided with a synchronous pulley. The two synchronous pulleys are connected by a synchronous belt, and the synchronous pulley meshes with the synchronous belt. The first gear is coaxially connected to the bottom end of the adjusting column. The transmission mechanism also includes a mechanical housing. The pneumatic assembly includes 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 rotary table, and a transmission column. The mechanical housing has a pneumatic cavity inside. A rubber sealing ring is fitted on the outside of the piston. The outer periphery of the rubber sealing ring is movably connected to the inner wall of the pneumatic cavity. A connecting rod one is provided on the piston. One end of the connecting rod one is rotatably connected to one end of the connecting rod two. The other end of the connecting rod two is rotatably connected to the connecting rod three. The outer side of the rotary table is fixedly connected to the connecting rod three. A transmission column is provided in the middle of the rotary table. The transmission column is rotatably connected to the mechanical housing. The transmission column is connected to the central shaft of the gear two. A fixed platform is set in the middle of the pneumatic cavity. The fixed platform is connected to the piston through a return spring. The piston stroke is designed to be 15 to 30 mm. It is necessary to ensure that the return force generated by the spring at the maximum stroke matches the maximum driving force of the pneumatic cavity. When the spring constant is 5 N / mm, the piston is at a stroke position of 30 mm and the restoring force is 150 N; when the spring constant is 15 N / mm, the piston is at a stroke position of 20 mm and the restoring force is 300 N. Both can achieve rapid piston reset without impact. The maximum driving force corresponds to an air pressure of 0.4 MPa to 0.8 MPa. When the air pressure is 0.6 MPa, the corresponding thrust is 220 N. XM-19 austenitic stainless steel has a tensile strength ≥800 MPa at -196℃, and the linear expansion coefficient of Ni36 alloy is ≤1.5×10-6 / ℃. The clamping plate is equipped with probes made of beryllium bronze. The probes are part of the variable temperature Hall effect tester. While the clamping plate holds the sample, the probes can directly contact the sample. The test interface uses the original low temperature miniature rectangular connector of the tester to achieve seamless connection with the tester's dedicated low temperature cable.

[0010] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, a low-temperature compensation component is provided at the top of the adjustment column, and the clamping plate is located between the low-temperature compensation component and the compression ring.

[0011] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, the low-temperature compensation component includes an annular extrusion cylinder one, an annular extrusion cylinder two, an inner cylinder, an elastic connecting sleeve, a bladder, structural sphere one, and structural sphere two. The material of structural sphere one is perfluoroether rubber that can maintain good elasticity at low temperatures. The material of structural sphere two is a low-temperature volume expansion material including ZrW2O8. The diameter of structural sphere two is more than three times the diameter of structural sphere one. The particle size of structural sphere two is 50 to 200 μm, and the filling rate inside the bladder is 60% to 70%. The top of the annular extrusion cylinder 2 is provided with an annular groove, and the annular extrusion cylinder 1 is movably inserted into the inner side of the annular groove. Two inner cylinders of different sizes are provided in the annular groove. The inner cylinders are inserted into the annular extrusion cylinder 1. An elastic connecting sleeve is provided between the top of the inner cylinder and the inner top wall of the annular extrusion cylinder 1. The inner side of the inner cylinder contains a bladder. The bladder contains multiple structural spheres 1 and 2. The structural spheres 1 and 2 make the bladder egg-shaped. The top of the bladder abuts against the annular extrusion cylinder 1 and the bottom of the annular extrusion cylinder 2. When the temperature drops to the temperature of liquid nitrogen, the volume of the second structural sphere expands, increasing the volume of the bladder and pushing the annular extrusion cylinder one and the annular extrusion cylinder two to move relative to each other.

[0012] Annular extrusion cylinder one moves out of annular extrusion cylinder two, thereby compressing the locking ring and clamping plate, maintaining or increasing the pressure between the clamping plate and the extrusion ring. The low-temperature compensation component fills the gaps caused by the contraction of other structures due to temperature reduction by expanding, ensuring that the clamping plate and the adjusting column are locked relative to each other, preventing the clamping from loosening. The other structures include the locking ring, the ring-shaped limiting platform, the extrusion ring, and the spring washer.

[0013] As a preferred technical solution for a variable-temperature Hall effect measurement fixture, a middle column is provided at one end of the fixture body, a cover plate is provided on the middle column, the cover plate is connected to the working cylinder, and a test interface and a temperature control interface are provided on the front of the working cylinder.

[0014] As a preferred technical solution for measuring the variable temperature Hall effect, the fixture body is equipped with a heating resistor and a temperature sensor.

[0015] The beneficial effects of a variable-temperature Hall effect measuring fixture of the present invention are as follows: Low-temperature compensation mechanism: Through the low-temperature compensation component, which includes structural ball two and structural ball one, the low-temperature volume expansion characteristics of ZrW2O8 and the low-temperature elasticity of perfluoroether rubber are utilized to achieve expansion compensation at low temperature, fill the gaps caused by the cold contraction of other components, maintain the locking pressure between the clamping plate and the adjusting column, and ensure clamping stability. High-efficiency transmission and adjustment: The pneumatic components and gear transmission mechanism are used to drive the clamping plate precisely by means of a pneumatic chamber and piston, which simplifies the clamping force adjustment operation and improves the efficiency of clamping and releasing. Material optimization: XM-19 austenitic stainless steel and Ni36 alloy are selected, combined with perfluoroether rubber and ZrW2O8 to ensure the durability, elasticity and stability of the clamp in low temperature environment; Temperature adaptability: By setting heating resistors, temperature sensors, test interfaces and temperature control interfaces, the fixture can adapt to variable temperature environments, especially low temperatures, to ensure the accuracy and reliability of Hall effect testing. Attached Figure Description

[0016] 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: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the working cavity of the present invention; Figure 3 This is a schematic diagram of the internal structure of the mechanical box of the present invention; Figure 4 This is a schematic diagram of the internal structure of the low-temperature compensation component of the present invention; Figure 5 This is a schematic diagram of the structure of the spring washer of the present invention; 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; 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; Figure 8 This is a schematic diagram of the front structure of the present invention.

[0017] 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

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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. A sample stage 5 is provided on the rectangular plate; 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.

[0023] 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.

[0024] 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.

[0025] The middle part of the adjusting column 7 is fitted with a compression ring 10 and a spring washer 11. The lower side of the compression ring 10 abuts against the spring washer 11, and the bottom end of the spring washer 11 abuts against the limiting ring 23. The compression ring 10 compresses the lower side of the clamping plate 2.

[0026] The rectangular plate has a working chamber 15 inside, and a transmission mechanism is provided on the inner side of the working chamber 15. The transmission mechanism includes a gear 12, a gear 13, a synchronous pulley 14, a synchronous belt 16, and a pneumatic component. Two gears 12 are rotatably connected to both sides of the working chamber 15. The two gears 12 on the same side of the working chamber 15 mesh with each other. A synchronous pulley 14 is provided on one of the gears 12 on one side of the working chamber 15. A gear 2 13 is rotatably connected to the other side of the working chamber 15. The gear 2 13 meshes with one of the gears 12. One end of the gear 2 13 is connected to the pneumatic component, and the other end of the gear 2 13 is provided with a synchronous pulley 14. The two synchronous pulleys 14 are connected by a synchronous belt 16 and mesh with the synchronous belt 16. The gear 12 is coaxially connected to the bottom end of the adjusting column 7. The transmission mechanism also includes a mechanical housing 17. The pneumatic assembly includes a pneumatic cavity 25, a piston 26, a return spring 27, a rubber sealing ring 28, a connecting rod 1 29, a connecting rod 20, a connecting rod 31, a rotary table 32, and a transmission column 33. The mechanical housing 17 has a pneumatic cavity 25 inside. The piston 26 is fitted with a rubber sealing ring 28 on its outer side. The outer periphery of the rubber sealing ring 28 is movably connected to the inner wall of the pneumatic cavity 25. A connecting rod 1 29 is provided on the piston 26. One end of the connecting rod 1 29 is rotatably connected to the connecting rod 20, and the other end of the connecting rod 20 is rotatably connected to the connecting rod 31. The outer side of the rotary table 32 is fixedly connected to the connecting rod 31. A transmission column 33 is provided in the middle of the rotary table 32. The transmission column 33 is rotatably connected to the mechanical housing 17 and is connected to the central shaft of the gear 2 13. A fixed platform is provided in the middle of the pneumatic cavity 25, and the fixed platform is connected to the piston 26 through a return spring 27; The clamping plate 2 is equipped with a probe made of beryllium bronze. The probe is part of the variable temperature Hall effect tester. While the clamping plate 2 clamps the sample, the probe can directly contact the sample.

[0027] The clamping plate 2 is located above the sample stage 5 and is arranged around the sample stage 5.

[0028] The top of the adjusting column 7 is provided with a low temperature compensation component, and the clamping plate 2 is located between the low temperature compensation component and the compression ring 10.

[0029] The low-temperature compensation component includes an annular extrusion cylinder 1 8, an annular extrusion cylinder 2 9, an inner cylinder 34, an elastic connecting sleeve 19, a bladder 20, a structural ball 1 21, and a structural ball 22. The material of the structural ball 1 21 is perfluoroether rubber that can maintain good elasticity at low temperatures. The material of the structural ball 22 is a low-temperature volume expansion material including ZrW2O8. The diameter of the structural ball 22 is more than three times the diameter of the structural ball 1 21. The top of the annular extrusion cylinder 29 is provided with an annular groove, and the annular extrusion cylinder 18 is movably inserted into the inner side of the annular groove. Two inner cylinders 34 of different sizes are provided in the annular groove. The inner cylinders 34 are inserted into the annular extrusion cylinder 18. An elastic connecting sleeve 19 is provided between the top of the inner cylinder 34 and the inner top wall of the annular extrusion cylinder 18. The inner side of the inner cylinder 34 accommodates a bladder 20. The bladder 20 contains a plurality of structural spheres 1 21 and 2 22. The structural spheres 1 21 and 2 22 make the bladder 20 egg-shaped. The top of the bladder 20 abuts against the bottom of the annular extrusion cylinder 18 and the annular extrusion cylinder 29. When the temperature drops to liquid nitrogen temperature, the volume of structural sphere 22 expands, increasing the volume of bladder 20 and pushing annular extrusion cylinder 8 and annular extrusion cylinder 9 to move relative to each other. Annular extrusion cylinder 8 moves out of annular extrusion cylinder 9, thereby compressing the locking ring 3 and clamping plate 2, maintaining or increasing the pressure between clamping plate 2 and extrusion ring 10. The cryogenic compensation component fills the gaps caused by the contraction of other structures due to temperature reduction by expanding, ensuring that clamping plate 2 and adjusting column 7 are locked relative to each other, preventing clamping from loosening. The other structures include locking ring 3, ring-shaped limiting platform 24, extrusion ring 10, and spring washer 11.

[0030] The rubber sealing ring 28 is made of perfluoroether rubber FFKM, and its low-temperature sealing performance parameter is a leakage rate ≤1×10 at -196℃. -7 Pa・m 3 / s.

[0031] One end of the fixture body 1 is provided with a middle column 36, and a cover plate 37 is provided on the middle column 36. The cover plate 37 is connected to the working cylinder 38. The front of the working cylinder 38 is provided with a test interface 39 and a temperature control interface 40.

[0032] The fixture body 1 is equipped with a heating resistor and a temperature sensor.

[0033] An annular cavity space is formed between the two inner cylinders 34, and the two inner cylinders 34 are respectively connected to the two vertical walls of the inner cavity of the annular extrusion cylinder 8.

[0034] The specific implementation method includes the following steps: air is supplied to the pneumatic chamber 25 through the air pipe, which pushes the piston 26 to move and compresses the return spring 27; then the piston 26 drives the connecting rod 1 29, connecting rod 2 30 and connecting rod 3 31 to rotate the rotary table 32 and the transmission column 33; the transmission column 33 drives the gear 2 13 and the synchronous pulley 14 to rotate, which in turn drives the gear 12 to rotate in the opposite direction; through the synchronous belt 16, the gear 12 on the other side rotates synchronously, so that the gear 12 on the same side rotates in opposite directions. Position the sample on the sample stage 5, and drive the adjusting column 7 with gear 12 to bring the clamping plates 2 closer together or further apart, clamping or releasing the sample at the sample stage 5; place the fixture body 1 in a low-temperature environment, and the fixture body 1 carries the sample into the low-temperature environment.

[0035] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fixture for measuring the Hall effect at varying temperatures, characterized in that: The fixture includes a main body (1), one end of which is provided with a rectangular plate. 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 main body (1). The top of the adjustment post (7) is provided with a locking ring (3). An adjustment groove (4) is provided on the clamping plate (2), and a limit ring (23) is provided at the bottom of the adjustment column (7). 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).

2. The variable-temperature Hall effect measuring fixture according to claim 1, characterized in that: 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).

3. The variable-temperature Hall effect measuring fixture according to claim 2, characterized in that: 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.

4. The variable-temperature Hall effect measuring fixture according to claim 1, characterized in that: The middle part of the adjusting column (7) is fitted with a compression ring (10) and a spring washer (11). The lower side of the compression ring (10) abuts against the spring washer (11), and the bottom end of the spring washer (11) abuts against the limiting ring (23). The compression ring (10) squeezes the lower side of the clamping plate (2).

5. A variable-temperature Hall effect measuring fixture according to claim 1, characterized in that: The rectangular plate has a working chamber (15) inside. A transmission mechanism is provided on the inner side of the working chamber (15). The transmission mechanism includes a gear 1 (12), a gear 2 (13), a synchronous pulley (14), a synchronous belt (16), and a pneumatic component. Two gears 1 (12) are rotatably connected to the two sides of the working chamber (15). The two gears 1 (12) on the same side of the working chamber (15) mesh with each other. A synchronous pulley (14) is provided on one of the gears 1 (12) on one side of the working chamber (15). A gear 2 (13) is rotatably connected to the other side of the working chamber (15). The gear 2 (13) meshes with one of the gears 1 (12). One end of the gear 2 (13) is connected to the pneumatic component. The other end of the gear 2 (13) is provided with a synchronous pulley (14). The two synchronous pulleys (14) are connected by a synchronous belt (16). The synchronous pulley (14) meshes with the synchronous belt (16). The gear 1 (12) is coaxially connected to the bottom end of the adjusting column (7).

6. A variable-temperature Hall effect measuring fixture according to claim 5, characterized in that: The transmission mechanism also includes a mechanical housing (17), and the pneumatic assembly includes a pneumatic chamber (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 rotary table (32), and a transmission column (33). The pneumatic chamber (25) is provided inside the mechanical housing (17), and a rubber sealing ring (28) is sleeved on the outside of the piston (26). The outer periphery of the rubber sealing ring (28) is connected to the pneumatic chamber (25). The inner wall of the rotating platform (32) is movably connected. A connecting rod 1 (29) is provided on the piston (26). One end of the connecting rod 1 (29) is rotatably connected to one end of the connecting rod 2 (30). A connecting rod 3 (31) is fixedly connected to the outside of the rotating platform (32). The other end of the connecting rod 2 (30) is rotatably connected to the connecting rod 3 (31). A transmission column (33) is provided in the middle of the rotating platform (32). The transmission column (33) is rotatably connected to the mechanical box (17). The transmission column (33) is connected to the central shaft of the gear 2 (13).

7. A variable-temperature Hall effect measuring fixture according to claim 1, characterized in that: The top of the adjusting column (7) is provided with a low temperature compensation component, and the clamping plate (2) is located between the low temperature compensation component and the extrusion ring (10).

8. A variable-temperature Hall effect measuring fixture according to claim 7, characterized in that: The low-temperature compensation component includes an annular extrusion cylinder one (8), an annular extrusion cylinder two (9), an inner cylinder (34), an elastic connecting sleeve (19), a bladder (20), a structural ball one (21) and a structural ball two (22). The material of the structural ball two (22) is a low-temperature volume expansion material including ZrW2O8, and the diameter of the structural ball two (22) is more than three times the diameter of the structural ball one (21). The top of the annular extrusion cylinder 2 (9) is provided with an annular groove, and the annular extrusion cylinder 1 (8) is movably inserted into the inner side of the annular groove. Two inner cylinders (34) of different sizes are provided in the annular groove. The inner cylinder (34) is inserted into the annular extrusion cylinder 1 (8). An elastic connecting sleeve (19) is provided between the top of the inner cylinder (34) and the inner top wall of the annular extrusion cylinder 1 (8). The inner side of the inner cylinder (34) contains a bladder (20). The bladder (20) contains multiple structural balls 1 (21) and structural balls 2 (22). The structural balls 1 (21) and structural balls 2 (22) make the bladder (20) egg-shaped. The top of the bladder (20) abuts against the annular extrusion cylinder 1 (8) and the bottom abuts against the annular extrusion cylinder 2 (9).

9. A variable-temperature Hall effect measuring fixture according to claim 1, characterized in that: One end of the fixture body (1) is provided with an intermediate column (36), and a cover plate (37) is provided on the intermediate column (36), and the cover plate (37) is connected to the working cylinder (38).

10. A variable-temperature Hall effect measuring fixture according to claim 2, characterized in that: A heating resistor and a temperature sensor are provided on the fixture body (1).

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