A magnetic four-probe hot and cold stage

Abstract

The present invention discloses a magnetic four-probe hot and cold table, including a cavity, a top cover, a sample carrier core assembly and a magnetic probe assembly, wherein the cavity and the top cover form a closed test cavity environment, wherein the sample carrier core assembly and the magnetic probe assembly are arranged in the cavity, wherein the magnetic probe assembly is adsorbed in the cavity by a magnet, wherein the sample carrier core assembly is assembled and fixed with the cavity through a connection port of a temperature control flange; wherein one end of the cavity is provided with a plurality of BNC interfaces, wherein the BNC interfaces are connected with the magnetic probe assembly through a connecting line. The present invention independently modularizes the probe base, and the probe base can be effectively fixed at any position of the bottom plate at will by magnetic attraction, and can flexibly contact various positions of the sample, thereby satisfying the electrical test of material samples of different shapes and sizes; the probe and base modules can be flexibly disassembled when not in use, thereby expanding the sample cavity space of the probe hot and cold table, and a vacuum connection structure is designed, which can conveniently disassemble and switch the atmosphere and vacuum test functions.

Description

Technical Field

[0001] The invention relates to the technical field of probe hot and cold stages, in particular to a magnetic four-probe hot and cold stage. Background Art

[0002] The probe hot and cold stage is an important testing equipment in the field of research on the electrical properties of materials under different temperature conditions. This equipment controls the temperature and atmosphere to make the test sample reach the set temperature, and then uses the internal fixed probe to press and contact the test sample. The probe inputs and outputs the test electrical signal, thereby studying the electrical properties of the material under different temperature and atmosphere environments. It is mainly used for research on new material upgrades and development.

[0003] The probe base inside the probe hot and cold stage is a fixed structure with a small range of motion and complex assembly and disassembly. It cannot meet the testing requirements of material samples of different shapes and sizes, and cannot take into account electrical testing in both atmosphere and vacuum environments. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetic four-probe hot and cold stage to solve the problem that the probe base inside the probe hot and cold stage in the prior art is a fixed structure, has a small range of motion, is complicated to disassemble and assemble, and cannot meet the testing requirements of material samples of different shapes and sizes.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a magnetic four-probe hot and cold stage, comprising a cavity, a top cover, a sample carrier core assembly and a magnetic probe assembly, the cavity and the top cover constitute a closed test cavity environment, the cavity is provided with a sample carrier core assembly and a magnetic probe assembly, the magnetic probe assembly is adsorbed in the cavity by a magnet, the sample carrier core assembly is assembled and fixed to the cavity through a connection port of a temperature control flange; a plurality of BNC interfaces are provided at one end of the cavity, and the BNC interface is connected to the magnetic probe assembly through a connecting line.

[0006] Preferably, the cavity is provided with a plurality of atmosphere and vacuum interfaces; the cavity is provided with two circulating water interfaces.

[0007] Preferably, a window glass is installed in the middle of the top cover.

[0008] Preferably, the sample loading platform core assembly comprises a temperature control flange, a zirconium bead fixing plate and a platform core, the temperature control aviation plug of the temperature control flange extends to the outside of the cavity, the temperature control flange comprises two symmetrically arranged cantilevers, each of the cantilevers is supported by a spring set screw against the zirconium bead fixing plate, and the zirconium bead fixing plate is installed with zirconium beads;

[0009] The core is located between two zirconium bead fixing plates, and two sides of the core are clamped by zirconium beads.

[0010] Preferably, a heating rod and a stainless steel tube are installed in the core, the stainless steel tube extends to the outside of the cavity, and a temperature sensor is installed in the core.

[0011] Preferably, the magnetic probe assembly includes a stainless steel pressing block, a magnetic probe base and a probe, the probe is clamped by the stainless steel pressing block and the magnetic probe base, the stainless steel pressing block and the magnetic probe base are fixed by fixing screws, the stainless steel pressing block is a conductor, and the probe and the stainless steel pressing block are in a conductive state; the stainless steel pressing block is provided with a fixed port, and the wire connector of the BNC interface is inserted into the fixed port; the magnetic probe base is an insulator, and a base magnet is installed at the bottom of the magnetic probe base, and the magnetic probe base is magnetically fixed to the bottom inner side of the cavity through the magnet.

[0012] Preferably, a circular long groove is designed inside the magnetic probe assembly, a built-in spring is arranged in the circular long groove of the magnetic probe assembly, two steel balls are installed at the bottom of the built-in spring, and the probe is fixed in the gap between the two steel balls.

[0013] Preferably, a probe angle adjustment screw is provided on the side of the circular long groove inside the magnetic probe assembly, and the probe angle adjustment screw adjusts the pitch angle of the probe by pressing the probe and moving it up and down.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The probe base is modularized independently, and can be effectively fixed at any position of the base plate by magnetic attraction, so as to flexibly contact various positions of the sample, thereby meeting the electrical test of samples of different shapes and sizes. The probe and base modules can be flexibly disassembled when not in use, expanding the sample cavity space of the probe hot and cold stage. At the same time, the vacuum connection structure is optimized and designed, which can conveniently disassemble and switch the atmosphere and vacuum test functions.

[0016] 2. Sample loading table core assembly: The design structure of automatic compensation for thermal expansion and contraction and electrical suspension ensures reliable fixation of the core and anti-interference ability of electrical testing.

[0017] 3. Magnetic probe assembly: The compatible design of effective electrical conduction and electrical insulation and the probe floating structure design ensure effective contact measurement of samples of various sizes and shapes.

[0018] 4. The sample measurement range has been expanded, and the magnetic probe assembly can be moved freely, which can effectively meet the requirements of different shapes, sizes, and measurement parts; it has high compatibility, and the magnetic probe assembly can be easily replaced to save test time.

[0019] 5. Improve the accuracy of electrical testing: The core clamping adaptive structure and electrical suspension design can effectively prevent external electrical interference during sample testing. The effective electrical conduction and electrical insulation compatible with the probe floating structure design further improve the accuracy of electrical testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the present invention when the top cover is removed;

[0023] Figure 3 It is a structural schematic diagram of the sample carrier core assembly of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the temperature control flange of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the core of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the magnetic suction probe assembly of the present invention;

[0027] Figure 7 The present invention Figure 6 Schematic diagram of the structure from the bottom perspective;

[0028] Figure 8 It is an exploded view of the magnetic probe assembly of the present invention.

[0029] In the figure: 1. Cavity; 2. Top cover; 3. Window glass; 4. Circulating water interface; 5. Atmosphere and vacuum interface; 6. Temperature control aviation plug; 7. BNC interface; 8. Sample loading platform core assembly; 9. Magnetic probe assembly; 10. Temperature control flange; 11. Spring set screw; 12. Zirconium bead fixing plate; 13. Zirconium bead; 14. Stainless steel pipe; 15. Heating rod; 16. Platform core; 17. Temperature sensor; 18. Stainless steel pressure block; 19. Magnetic probe base; 20. Fixed port; 21. Fixing screw; 22. Probe angle adjustment screw; 23. Probe; 24. Base magnet; 25. Built-in spring; 26. Steel ball. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0031] See also Figure 1-8 In an embodiment of the present invention, a magnetic four-probe hot and cold stage comprises a cavity 1, a top cover 2, a sample carrier core assembly 8 and a magnetic probe assembly 9. The cavity 1 and the top cover 2 form a closed test cavity 1 environment. A window glass 3 is installed in the middle of the top cover 2. The cavity 1 is provided with a sample carrier core assembly 8 and a magnetic probe assembly 9. The magnetic probe assembly 9 is adsorbed in the cavity 1 by a magnet. The sample carrier core assembly 8 is assembled and fixed to the cavity 1 through the connection port of the temperature control flange 10. A plurality of BNC interfaces 7 are provided at one end of the cavity 1. The BNC interfaces 7 are connected to the magnetic probe assembly 9 through a connecting line. The cavity 1 is provided with a plurality of atmosphere and vacuum interfaces 5. The cavity 1 is provided with two circulating water interfaces 4. The cavity 1 and the top cover 2 form a closed test cavity environment, and the cavity environment is filled with atmosphere or evacuated through the atmosphere and vacuum interface 5. The circulating water interface 4 is used to connect the external cooling circulating water to ensure the temperature stability of the cavity 1 to avoid undesirable phenomena such as overheating or over-condensation and frost during the test; a window glass 3 is designed in the middle of the top cover 2 to facilitate visual observation or CCD assistance of the probe injection operation during the test; the BNC interface 7 is connected to the magnetic probe assembly 9 through a connecting line, and the magnetic probe assembly 9 is placed in the hot and cold stage cavity 1 by magnet adsorption; the sample loading platform core assembly 8 is assembled and fixed to the cavity 1 through the connection port of the temperature control flange 10, and the test sample is placed horizontally on the sample loading platform core 8, and the test sample reaches the set temperature and is maintained through the effect of heat conduction.

[0032] The sample loading table core assembly 8 includes a temperature control flange 10, a zirconium bead fixing plate 12 and a table core 16. The temperature control aviation plug 6 of the temperature control flange 10 extends to the outside of the cavity 1. The temperature control flange 10 includes two symmetrically arranged cantilevers, each of which is supported by a zirconium bead fixing plate 12 through a spring set screw 11, and the zirconium bead fixing plate 12 is installed with a zirconium bead 13; the table core 16 is located between the two zirconium bead fixing plates 12, and the two sides of the table core 16 are clamped by the zirconium beads 13; a heating rod 15 and a stainless steel tube 14 are installed in the table core 16, and the stainless steel tube 14 extends to the outside of the cavity 1, and the table core 16 is installed with a temperature sensor 17. The cantilever in the temperature control flange 10 is symmetrical on the left and right. Four spring set screws 11 with floating function are designed to support the zircon bead fixing plate 12. The inner side of the zircon bead fixing plate 12 is designed with a positioning groove. Four zircon beads 13 are installed at the positioning groove position. The zircon beads 13 clamp and fix the core 16 in the middle position. This structural design can fine-tune the position of the core 16 on the left and right. It can also compensate for the dimensional changes caused by thermal expansion and contraction during the heating and cooling of the core through the floating function of the spring set screws 11, and keep the core 16 reliably fixed. The zircon beads 13 can play an excellent insulating role, so that the core 16 is in an electrically suspended state, which greatly improves the accuracy of electrical testing; the core 16 is heated by the heating rod 15, cooled by passing liquid nitrogen through the stainless steel pipe 14, and connected to the external temperature control system through the temperature sensor 17 to complete the temperature signal collection feedback and heating and cooling precision control.

[0033] The magnetic probe assembly 9 includes a stainless steel pressing block 18, a magnetic probe base 19 and a probe 23. The probe 23 is clamped by the stainless steel pressing block 18 and the magnetic probe base 19. The stainless steel pressing block 18 and the magnetic probe base 19 are fixed by a fixing screw 21. The stainless steel pressing block 18 is a conductor, and the probe 23 and the stainless steel pressing block 18 are in a conductive state. The stainless steel pressing block 18 is provided with a fixed port 20, and the wire connector of the BNC interface 7 is inserted into the fixed port 20. The magnetic probe base 19 is an insulator, and the bottom of the magnetic probe base 19 is fixed to the magnetic probe base 19. A base magnet 24 is installed, and the magnetic probe base 19 is fixed to the bottom of the inner side of the cavity 1 by magnet; a circular long groove is designed inside the magnetic probe assembly 9, and a built-in spring 25 is arranged in the circular long groove of the magnetic probe assembly 9, and two steel balls 26 are installed at the bottom of the built-in spring 25, and the probe 23 is fixed in the gap between the two steel balls 26; a probe angle adjustment screw 22 is arranged on the side of the circular long groove inside the magnetic probe assembly 9, and the probe angle adjustment screw 22 adjusts the pitch angle of the probe 23 by pressing the probe 23 up and down. The stainless steel pressing block 18 and the magnetic probe base 19 are fixed by screws to form the main body of the magnetic probe assembly 9, and the probe 23 and the stainless steel pressing block 18 are in a conductive state. The stainless steel pressing block 18 is a conductor, and a BNC connection line fixing port 20 is designed on the lower side, and the wire connector of the BNC interface 7 is inserted into it, and then the wire connector is pressed by the BNC connection line fixing screw, so as to effectively connect the probe 23 with the BNC interface 7 outside the cavity. The magnetic probe base 19 is an insulator, which is magnetically fixed to the bottom of the cavity 1 by three base magnets installed and fixed at the bottom, thereby ensuring effective insulation between the probe 23 and the cavity 1; a circular long groove is designed inside the magnetic probe assembly 9, and a built-in spring 23 is installed at the bottom of the long groove. Two steel balls 26 are installed at the bottom of the built-in spring 23, and the probe 23 is fixed in the gap between the two steel balls 26. This structure can ensure that the probe can move freely forward and backward and up and down. A probe angle adjustment screw 22 is designed on the side of the circular long groove inside the magnetic probe assembly 9, and the pitch angle of the probe can be adjusted by pressing the probe 23 up and down.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic four-probe hot and cold stage, characterized in that: The invention comprises a chamber (1), a top cover (2), a sample carrier core assembly (8) and a magnetic probe assembly (9), wherein the chamber (1) and the top cover (2) form a closed test chamber (1) environment, wherein the sample carrier core assembly (8) and the magnetic probe assembly (9) are arranged in the chamber (1), wherein the magnetic probe assembly (9) is adsorbed in the chamber (1) by a magnet, and wherein the sample carrier core assembly (8) is assembled and fixed to the chamber (1) via a connection port of a temperature control flange (10); One end of the cavity (1) is provided with a plurality of BNC interfaces (7), and the BNC interfaces (7) are connected to the magnetic probe assembly (9) via a connecting line.

2. A magnetic four-probe (23) hot and cold stage according to claim 1, characterized in that: The cavity (1) is provided with a plurality of atmosphere and vacuum interfaces (5); the cavity (1) is provided with two circulating water interfaces (4).

3. A magnetic four-probe (23) hot and cold stage according to claim 1, characterized in that: A window glass (3) is installed in the middle of the top cover (2).

4. A magnetic four-probe (23) hot and cold stage according to claim 1, characterized in that: The sample loading platform core assembly (8) comprises a temperature control flange (10), a zirconium bead fixing plate (12) and a platform core (16); the temperature control aviation plug (6) of the temperature control flange (10) extends to the outside of the cavity (1); the temperature control flange (10) comprises two symmetrically arranged cantilevers, each of which is supported by a zirconium bead fixing plate (12) through a spring set screw (11); and the zirconium bead fixing plate (12) is installed with a zirconium bead (13); The core (16) is located between two zirconium bead fixing plates (12), and two sides of the core (16) are clamped by zirconium beads (13).

5. A magnetic four-probe (23) hot and cold stage according to claim 4, characterized in that: A heating rod (15) and a stainless steel tube (14) are installed in the core (16); the stainless steel tube (14) extends to the outside of the cavity (1); and a temperature sensor (17) is installed in the core (16).

6. A magnetic four-probe (23) hot and cold stage according to claim 1, characterized in that: The magnetic probe assembly (9) comprises a stainless steel pressing block (18), a magnetic probe base (19) and a probe (23); the probe (23) is clamped by the stainless steel pressing block (18) and the magnetic probe base (19); the stainless steel pressing block (18) and the magnetic probe base (19) are fixed by a fixing screw (21); the stainless steel pressing block (18) is a conductor, and the probe (23) and the stainless steel pressing block (18) are in a conductive state; the stainless steel pressing block (18) is provided with a fixing port (20), and the wire connector of the BNC interface (7) is inserted into the fixing port (20); the magnetic probe base (19) is an insulator, and a base magnet (24) is installed at the bottom of the magnetic probe base (19); the magnetic probe base (19) is fixed to the inner bottom of the cavity (1) by a magnet.

7. A magnetic four-probe (23) hot and cold stage according to claim 6, characterized in that: The magnetic probe assembly (9) is designed with a circular long groove inside, and a built-in spring (25) is arranged in the circular long groove of the magnetic probe assembly (9). Two steel balls (26) are installed at the bottom of the built-in spring (25), and the probe (23) is fixed in the gap between the two steel balls (26).

8. A magnetic four-probe (23) hot and cold stage according to claim 7, characterized in that: A probe angle adjustment screw (22) is provided on the side of the circular long groove inside the magnetic suction probe assembly (9), and the probe angle adjustment screw (22) adjusts the pitch angle of the probe (23) by pressing the probe (23) and moving it up and down.

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