A device for testing thermal resistance of silicone grease

Abstract

The utility model relates to the technical field of heat conduction performance test, disclose a device for testing silicon grease thermal resistance, including base, base outer wall fixedly connected with support plate, base outer wall fixedly connected with support wheel, the extrusion subassembly that is provided with in base top, the extrusion subassembly includes cylinder, cylinder sets up in base top, support plate outer wall fixedly connected with slide post, slide post outer wall slidingly connected with connecting plate no.

Description

Technical Field

[0001] This utility model relates to the field of thermal conductivity testing technology, and in particular to a device for testing the thermal resistance of silicone grease. Background Technology

[0002] In the research and testing of heat dissipation performance of electronic devices, silicone grease, as a common thermal interface material, directly affects the heat dissipation efficiency and service life of the device due to its thermal resistance performance. In order to obtain the thermal resistance parameters of silicone grease under different pressure, thickness and contact conditions, it is usually necessary to use a professional testing device to achieve accurate measurement. The testing device needs to clamp the silicone grease between the test interfaces under controlled conditions and calculate the thermal resistance value by the relationship between temperature change and heat flow transfer. Therefore, developing a silicone grease thermal resistance testing device with reasonable structure, simple operation and improved testing accuracy has important engineering significance.

[0003] Most existing thermal resistance testing devices for silicone grease employ a mechanical structure consisting of a base, a heating source, and an upper pressure plate. During testing, silicone grease is typically evenly coated onto the sample surface and then clamped between the upper and lower test interfaces. The bottom heating source provides a stable heat flow, while the upper pressure plate mechanically applies pressure to ensure a stable contact state between the silicone grease layer and the sample, thereby guaranteeing effective heat transfer. Subsequently, the temperature difference is obtained through upper and lower temperature sensors, and combined with the known heat flow rate, the thermal resistance parameters of the silicone grease are calculated. This type of device has an intuitive structure and can effectively reflect the thermal conductivity of materials, thus it is widely used in experimental and industrial applications.

[0004] However, in the existing technology, the upper pressure plate usually needs to apply fixing force in multiple directions to ensure that the sample remains stable under pressure. This method is relatively complicated in operation, which not only increases the test preparation time, but also makes it difficult to keep the synchronization of multiple fixing points completely consistent, which can easily cause uneven force on the pressure plate, affect the stability of the contact interface, and thus reduce the test accuracy. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a device for testing the thermal resistance of silicone grease, aiming to improve the problem that the existing structure fixes the pressure plate from multiple directions, resulting in cumbersome operation and low accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the thermal resistance of silicone grease, comprising a base, a support plate fixedly connected to the outer wall of the base, a support wheel fixedly connected to the outer wall of the base, and an extrusion assembly disposed above the base; The extrusion assembly includes a cylinder, which is disposed above the base. A sliding column is fixedly connected to the outer wall of the support plate. A connecting plate one is slidably connected to the outer wall of the sliding column. A connecting plate two is fixedly connected to the outer wall of the sliding column. The upper surface of the connecting plate two is fixedly connected to the lower surface of the cylinder. Fasteners are fixedly connected to the outer wall of the connecting plate two. A limit post is slidably connected to the inner wall of the connecting plate two. One end of the limit post is fixedly connected to the upper surface of the connecting plate one. A connecting plate three is fixedly connected to the output end of the cylinder. The upper surface of the connecting plate three is fixedly connected to the lower surface of the connecting plate three. A connecting column is fixedly connected to the lower surface of the connecting column. A connecting plate four is fixedly connected to the lower surface of the connecting plate four. An electric heater is fixedly connected to the lower surface of the electric heater. A pressure plate is fixedly connected to the lower surface of the electric heater. A clamping assembly is disposed above the base.

[0007] The above technical solution achieves uniform pressing and heating of the silicone grease sample. A cylinder drives the pressure plate to move vertically, while limiting posts and sliding posts guide and limit the pressing structure to ensure uniform force on the sample. An electric heater heats the upper surface of the pressure plate to form a hot end, while the base and cooling structure form a cold end, establishing a stable temperature difference between the upper and lower surfaces of the sample, providing reliable conditions for measuring thermal conductivity and thermal resistance. The clamping assembly uniformly clamps the pressure plate, ensuring its stability and preventing skewing, thereby improving testing accuracy, repeatability, and sample adhesion.

[0008] Furthermore, the clamping assembly includes four clamping blocks, which are disposed above the base. A connecting plate is fixedly connected to the upper surface of the base. A rotating disk is rotatably connected to the inner wall of the connecting plate. An arc-shaped groove is formed inside the rotating disk. A sliding disk is fixedly connected to the inner wall of the connecting plate. The sliding disk is disposed above the rotating disk. The inner wall of the sliding disk is slidably connected to the outer wall of the clamping block. The outer wall of the clamping block is slidably connected to the inner wall of the pressure plate. Limiting rods are fixedly connected to the inner walls of the four clamping blocks. The outer walls of the limiting rods are slidably connected to the arc-shaped grooves formed inside the rotating disk. A fixing block is fixedly connected to the outer wall of the rotating disk. A connecting block is fixedly connected to the outer wall of the connecting plate. A limiting block is slidably connected to the inner wall of the connecting block. The outer wall of the fixing block is slidably connected to the sliding groove formed inside the limiting block. A threaded rod is threadedly connected to the inner wall of the connecting block. One end of the threaded rod is rotatably connected to the outer wall of the limiting block.

[0009] The above technical solution achieves uniform pressing and heating of the silicone grease sample. A cylinder drives the pressure plate to move vertically, while limiting posts and sliding posts guide and limit the pressing structure to ensure uniform force on the sample. An electric heater heats the upper surface of the pressure plate to form a hot end, while the base and cooling structure form a cold end, establishing a stable temperature difference between the upper and lower surfaces of the sample, providing reliable conditions for measuring thermal conductivity and thermal resistance. The clamping assembly uniformly clamps the pressure plate, ensuring its stability and preventing skewing, thereby improving testing accuracy, repeatability, and sample adhesion.

[0010] Furthermore, a cooling platform is fixedly connected to the upper surface of the base, and a collection box is fixedly connected to the inner wall of the base.

[0011] The above technical solution achieves stable control of the low-temperature end of the silicone grease sample, ensuring uniform cooling of the sample and providing reliable temperature conditions for thermal resistance and thermal conductivity testing.

[0012] Furthermore, a cooling pipe is fixedly connected to the upper surface of the collection box, and a water pump is fixedly connected to the inner wall of the base.

[0013] The above technical solution enables a circulating cooling system formed by cooling pipes and water pumps, which efficiently removes the heat conducted by the sample, maintains stability at the low temperature end, and provides a reliable temperature control environment for thermal resistance testing.

[0014] Furthermore, the water pump input end is fixedly connected to a connecting pipe, and the water pump output end is fixedly connected to one end of a cooling pipe.

[0015] The above technical solution enables the circulation of coolant, allowing the cooling system to operate continuously, ensuring stable low-temperature end temperatures, and providing continuous and reliable cooling conditions for thermal resistance testing of silicone grease samples.

[0016] Furthermore, a copper pipe is fixedly connected to the other end of the cooling pipe, and a partition is fixedly connected to the inner wall of the collection box, which divides the inside of the collection box into upper and lower parts.

[0017] The above technical solution achieves the diversion and uniform flow of coolant. By separating the upper and lower cavities with a baffle and cooperating with copper tubes, the heat exchange efficiency is improved, and the temperature at the low-temperature end is kept uniform and stable.

[0018] Furthermore, multiple heat dissipation fins are fixedly connected to the upper surface of the partition plate, and the copper tube is fixedly connected to the inner wall of the heat dissipation fins.

[0019] The above technical solution improves heat conduction and dissipation efficiency, utilizes heat dissipation fins and copper pipes to efficiently remove heat conducted by the sample, and enhances the cooling effect and temperature stability at the low-temperature end.

[0020] Furthermore, one end of the copper tube is fixedly connected to the lower half of the collection box, and one end of the connecting pipe is fixedly connected to the lower half of the collection box.

[0021] The above technical solution enables smooth return and circulation of coolant, forming a stable circulation path in the cooling system, ensuring continuous and uniform cooling at the low-temperature end, and providing reliable conditions for thermal resistance testing of silicone grease samples.

[0022] This utility model has the following beneficial effects: 1. In this utility model, the silicone grease sample is pressed down by a multi-stage connecting plate and pressure plate driven by a cylinder. With the help of limiting posts and sliding posts, the force is uniform during the descent of the pressure plate, avoiding uneven pressure on the sample and ensuring consistent sample thickness and tight adhesion. At the same time, the electric heater and the base cooling structure form a hot end and a cold end, establishing a stable temperature difference between the upper and lower surfaces of the sample. This provides reliable conditions for the accurate testing of the thermal conductivity and thermal resistance parameters of the silicone grease. The clamping assembly achieves uniform clamping of the pressure plate, and the sliding plate ensures stable trajectory during the clamping process, preventing skewing and improving operational safety and experimental repeatability.

[0023] 2. In this utility model, the cooling circulation structure can efficiently remove the heat conducted by the sample, achieve stable cold end temperature and uniform coolant flow, extend the heat exchange path, and improve heat dissipation efficiency. By heating the hot end and cooling the cold end to form a controllable and stable temperature difference field, the silicone grease sample is uniformly compressed under controlled temperature, ensuring accurate and reliable thermal resistance measurement data, meeting the needs of scientific research and industrial testing for evaluating the performance of thermal interface materials, and improving the operability and applicability of the testing device. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a device for testing the thermal resistance of silicone grease according to the present invention. Figure 2 This is a schematic diagram of the electric heater part of the device for testing the thermal resistance of silicone grease proposed in this utility model; Figure 3 This is a schematic diagram of the clamping block structure of a device for testing the thermal resistance of silicone grease according to the present invention. Figure 4 This is a schematic diagram of the collection box part of the device for testing the thermal resistance of silicone grease proposed in this utility model; Figure 5 This is a schematic diagram of the heat dissipation fins of a device for testing the thermal resistance of thermal grease, as proposed in this utility model.

[0025] Legend: 1. Base; 2. Support wheel; 3. Support plate; 4. Sliding column; 5. Connecting plate one; 6. Connecting plate two; 7. Cylinder; 8. Limiting column; 9. Fastener; 10. Connecting plate three; 11. Connecting column; 12. Connecting plate four; 13. Electric heater; 14. Connecting plate; 15. Sliding plate; 16. Pressure plate; 17. Connecting block; 18. Threaded rod; 19. Limiting rod; 20. Rotating plate; 21. Arc groove; 22. Fixing block; 23. Clamping block; 24. Limiting block; 25. Cooling platform; 26. Cooling pipe; 27. Collection box; 28. Water pump; 29. ​​Heat dissipation fins; 30. Copper pipe; 31. Partition plate; 32. Connecting pipe. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0027] Reference Figure 1 - Figure 5 The present invention provides an embodiment of a device for testing the thermal resistance of silicone grease, comprising a base 1, which serves as the supporting foundation for the entire device, supporting the weight of all components and ensuring structural stability; at the same time, it works with a cooling platform 25 and a collection box 27 to form a cold end, achieving a stable temperature on the lower surface of the sample; a support plate 3 is fixedly connected to the outer wall of the base 1, a support wheel 2 is fixedly connected to the outer wall of the base 1, and an extrusion assembly is provided above the base 1. The extrusion assembly includes a cylinder 7, which provides vertical downward pressing power to drive the connecting plate 10 and the pressure plate 16 to move downward, achieving uniform extrusion of the sample. The cylinder 7 is positioned above the base 1. A sliding column 4 is fixedly connected to the outer wall of the support plate 3. A connecting plate 5 is slidably connected to the outer wall of the sliding column 4. A connecting plate 6 is fixedly connected to the outer wall of the sliding column 4. The upper surface of the connecting plate 6 is fixedly connected to the lower surface of the cylinder 7. Fasteners 9 are fixedly connected to the outer wall of the connecting plate 6. A limit post 8 is slidably connected to the inner wall of the connecting plate 6. The limit post 8 slides with the inner wall of the connecting plate 6 to guide the movement of the downward pressing structure and prevent the pressure plate 16 from tilting or experiencing uneven force. One end of the limit post 8 is fixedly connected to the upper surface of the connecting plate 5. The output end of the cylinder 7 is fixedly connected to the upper surface of the connecting plate 5. A connecting plate 3 10 is fixedly connected to the upper surface of the connecting plate 3 10, which is fixedly connected to the lower surface of the connecting plate 1 5. The connecting plate 1 5 serves as the foundation of the pressing structure, connecting the sliding column 4, the connecting plate 3 10, and the limiting column 8 to ensure the stability and accuracy of the pressure plate 16's descent. A connecting column 11 is fixedly connected to the lower surface of the connecting plate 3 10, and a connecting plate 4 12 is fixedly connected to the lower surface of the connecting column 11. An electric heater 13 is fixedly connected to the lower surface of the connecting plate 4 12. The electric heater 13 heats the upper surface of the pressure plate 16 to form a hot end, which together with the cooling end of the base 1 establishes a temperature difference field for the sample, enabling the testing of thermal conductivity and thermal resistance. The pressure plate 16 is fixedly connected to the lower surface of the electric heater 13, and a clamping assembly is provided above the base 1. The clamping assembly includes four clamping blocks 23, which are positioned above the base 1. A connecting plate 14 is fixedly connected to the upper surface of the base 1, and a rotating plate 20 is rotatably connected to the inner wall of the connecting plate 14. The rotating plate 20 and the connecting plate 14 rotate in cooperation. The radial contraction of the clamping blocks 23 is controlled by an arc groove 21, achieving uniform clamping of the pressure plate 16. An arc groove 21 is formed inside the rotating plate 20. A sliding plate 15 is fixedly connected to the inner wall of the connecting plate 14, and the sliding plate 15 is positioned above the rotating plate 20. The inner wall of the sliding plate 15 is slidably connected to the outer wall of the clamping blocks 23, and the outer wall of the clamping blocks 23 is slidably connected to the inner wall of the pressure plate 16. The clamping blocks 23 are evenly distributed around the pressure plate 16 and slide synchronously in the radial direction to achieve uniform clamping of the pressure plate 16, ensuring uniform and stable force on the sample. Each of the four clamping blocks 23 has a limiting rod 19 fixedly connected to its inner wall. The outer wall of the limiting rod 19 is slidably connected to an arc-shaped groove 21 inside the rotating disk 20. The arc-shaped groove 21 guides the limiting rod 19 to move, so that the clamping blocks 23 can be closed or opened along a predetermined trajectory. A fixing block 22 is fixedly connected to the outer wall of the rotating disk 20. A connecting block 17 is fixedly connected to the outer wall of the connecting disk 14. A limiting block 24 is slidably connected to the inner wall of the connecting block 17. The outer wall of the fixing block 22 is slidably connected to a groove inside the limiting block 24. A threaded rod 18 is threadedly connected to the inner wall of the connecting block 17. The rotation of the threaded rod 18 drives the connecting block 17 and the rotating disk 20 to move in coordination, so that the clamping blocks 23 can be closed towards the center and clamp the pressure plate 16. One end of the threaded rod 18 is rotatably connected to the outer wall of the limiting block 24.

[0028] Specifically, cylinder 7 provides vertical downward pressure, causing pressure plate 16 to move downwards evenly in the vertical direction, driving electric heater 13 to heat the upper surface of pressure plate 16 to form a hot end, while base 1 maintains the cold end, establishing a stable temperature difference between the upper and lower surfaces of the silicone grease sample, providing reliable conditions for thermal conductivity and thermal resistance testing. During the downward pressing process, limiting post 8 and sliding post 4 guide and limit pressure plate 16 to ensure uniform force distribution, avoid inconsistent sample thickness or uneven pressure, and achieve close contact and uniform compaction of the sample. To ensure the stability of pressure plate 16 during clamping, four clamping blocks 23 move synchronously in the radial direction, and the trajectory is controlled by sliding plate 15 to achieve uniform clamping of pressure plate 16, preventing skewing or tilting, thereby ensuring the repeatability and accuracy of the testing process, while ensuring that the sample is subjected to balanced force between the hot and cold ends, meeting the requirements of scientific research and industry for measuring the performance of silicone grease thermal interface materials.

[0029] Reference Figure 1 - Figure 5A cooling platform 25 is fixedly connected to the upper surface of the base 1, and a collection box 27 is fixedly connected to the inner wall of the base 1. The collection box 27 collects and guides the coolant. An internal partition 31 divides it into upper and lower chambers to ensure uniform coolant flow and improve heat exchange efficiency. A cooling pipe 26 is fixedly connected to the upper surface of the collection box 27. A water pump 28 is fixedly connected to the inner wall of the base 1. A connecting pipe 32 is fixedly connected to the input end of the water pump 28, connecting the input and output ends of the water pump 28 to the collection box 27 to achieve coolant circulation. The output end of the water pump 28 is fixedly connected to one end of the cooling pipe 26, and a copper pipe 30 is fixedly connected to the other end of the cooling pipe 26. A partition 31 is fixedly connected to the inner wall of the collection box 27, dividing the interior of the collection box 27 into upper and lower parts. Multiple heat dissipation fins 29 are fixedly connected to the upper surface of the partition 31. The heat dissipation fins 29 are installed in the upper half of the collection box 27 and cooperate with the copper pipe 30 to improve heat dissipation efficiency and accelerate the cooling of the coolant. The copper pipe 30 is fixedly connected to the inner wall of the heat dissipation fins 29. One end of the copper pipe 30 is fixedly connected to the lower half of the collection box 27, and one end of the connecting pipe 32 is fixedly connected to the lower half of the collection box 27. The collection box 27 collects and guides the coolant. The internal partition 31 divides it into upper and lower chambers to ensure uniform flow of coolant and improve heat exchange efficiency.

[0030] Specifically, the cooling platform 25 on the upper surface of the base 1 works in conjunction with the collection box 27 to provide uniform cooling for the sample. The internal partition 31 of the collection box 27 divides the cavity into upper and lower parts, making the coolant flow uniform, extending the heat exchange path, and improving heat dissipation efficiency. The water pump 28 continuously pushes the coolant through the connecting pipe 32 into the cooling pipe 26, and then back to the collection box 27 through the copper pipe 30 to achieve continuous circulation. The heat dissipation fins 29 on the upper part of the collection box 27 work in conjunction with the copper pipe 30 to efficiently remove the heat conducted by the sample, accelerate the cooling of the coolant, and ensure the temperature stability of the low-temperature end. By heating the hot end and cooling the low-temperature end, a controllable temperature difference field is formed, so that the silicone grease sample is under pressure under a stable temperature distribution, realizing the accuracy and repeatability of thermal resistance measurement, and meeting the requirements of scientific research and industrial testing for the performance evaluation of thermal interface materials.

[0031] Working principle: When a silicone grease sample needs to be extruded for testing, the cylinder 7 first drives the connecting plate 3 10 to move downward in the vertical direction. The connecting plate 3 10 keeps the entire pressing structure stable through the fixed cooperation between its upper surface and the connecting plate 1 5. The connecting column 11 fixedly connected to the lower surface of the connecting plate 3 10 descends synchronously, and further drives the connecting plate 4 12, the electric heater 13 and the pressure plate 16 below it to move downward as a whole. During the downward movement of the pressure plate 16, the limiting post 8 slides in the inner wall of the connecting plate 2 6, and works with the sliding post 4 to guide and limit the downward pressing structure, ensuring that the pressure plate 16 is subjected to uniform force during descent, thereby avoiding uneven pressure on the silicone grease sample. Finally, the pressure plate 16 evenly presses the silicone grease-coated test sample onto the cooling end surface above the base 1, achieving a consistent sample thickness and a close fit. At the same time, the electric heater 13 heats the upper end of the pressure plate 16, making the contact surface between the pressure plate 16 and the sample form a hot end, while the base 1, in conjunction with the cooling structure, keeps the lower contact surface as a cold end, thereby establishing a stable temperature difference between the upper and lower surfaces of the silicone grease sample, providing conditions for accurate testing of the thermal conductivity and thermal resistance parameters of the silicone grease. To further secure the pressure plate 16, four clamping blocks 23 are evenly distributed around the pressure plate 16. These clamping blocks 23 are embedded in the arc-shaped groove 21 of the rotating disk 20 through the limiting rod 19, allowing them to slide synchronously in the radial direction. When the operator rotates the threaded rod 18, the fixing block 22 on the outer wall of the rotating disk 20 slides in the groove on the inner wall of the limiting block 24, and at the same time drives the rotating disk 20 to rotate, the clamping blocks 23 are simultaneously pulled towards the center, achieving uniform clamping of the pressure plate 16. The sliding disk 15 cooperates with the clamping blocks 23 to ensure that its movement trajectory is accurate and stable, and to avoid deviation during the clamping process. Furthermore, after the extrusion and heating processes are completed, the device maintains the stability of the low-temperature end through a cooling circulation system. The water pump 28 continuously pushes the coolant into the cooling pipe 26 through the connecting pipe 32. The cooling pipe 26 is tightly embedded in the upper surface of the collection box 27, and its other end is connected to the copper pipe 30. The collection box 27 is equipped with a partition 31, which divides it into upper and lower chambers. The copper pipe 30 passes through the heat dissipation fins 29 set in the upper part of the collection box 27, which can efficiently remove the heat conducted down from the sample. At the same time, the cooled coolant flows into the lower part of the collection box 27, making the coolant flow more uniform and extending the heat exchange path, thereby improving the heat dissipation efficiency. After heat exchange, the coolant flows back to the lower part of the collection box 27 and is then driven by the water pump 28 to enter the circulation again. This process is repeated to form a stable low-temperature end. Through a stable and controllable temperature difference field between the cold end and the heating end, the device can accurately measure the actual thermal resistance value of the silicone grease while ensuring uniform temperature distribution of the sample, meeting the requirements of scientific research and industrial testing for the performance evaluation of thermal interface materials.

Claims

1. A device for testing the thermal resistance of silicone grease, comprising a base (1), characterized in that: A support plate (3) is fixedly connected to the outer wall of the base (1), a support wheel (2) is fixedly connected to the outer wall of the base (1), and an extrusion assembly is provided above the base (1); The extrusion assembly includes a cylinder (7), which is positioned above the base (1). A sliding column (4) is fixedly connected to the outer wall of the support plate (3). A connecting plate (5) is slidably connected to the outer wall of the sliding column (4). A connecting plate (6) is fixedly connected to the outer wall of the sliding column (4). The upper surface of the connecting plate (6) is fixedly connected to the lower surface of the cylinder (7). A fastener (9) is fixedly connected to the outer wall of the connecting plate (6). A limit post (8) is slidably connected to the inner wall of the connecting plate (6). One end of the limit post (8) is fixedly connected to... On the upper surface of connecting plate one (5), the output end of cylinder (7) is fixedly connected to connecting plate three (10), the upper surface of connecting plate three (10) is fixedly connected to the lower surface of connecting plate one (5), the lower surface of connecting plate three (10) is fixedly connected to connecting column (11), the lower surface of connecting column (11) is fixedly connected to connecting plate four (12), the lower surface of connecting plate four (12) is fixedly connected to electric heater (13), the lower surface of electric heater (13) is fixedly connected to pressure plate (16), and a clamping assembly is provided above the base (1).

2. The apparatus for testing the thermal resistance of silicone grease according to claim 1, characterized in that: The clamping assembly includes four clamping blocks (23). The clamping blocks (23) are disposed above the base (1). A connecting plate (14) is fixedly connected to the upper surface of the base (1). A rotating plate (20) is rotatably connected to the inner wall of the connecting plate (14). An arc groove (21) is provided inside the rotating plate (20). A sliding plate (15) is fixedly connected to the inner wall of the connecting plate (14). The sliding plate (15) is disposed above the rotating plate (20). The inner wall of the sliding plate (15) is slidably connected to the outer wall of the clamping blocks (23). The outer wall of the clamping blocks (23) is slidably connected to the inner wall of the pressure plate (16). The four clamping blocks... (23) Limiting rods (19) are fixedly connected to the inner walls. The outer wall of the limiting rods (19) is slidably connected to the arc groove (21) opened inside the rotating disk (20). The outer wall of the rotating disk (20) is fixedly connected to a fixing block (22). The outer wall of the connecting disk (14) is fixedly connected to a connecting block (17). The inner wall of the connecting block (17) is slidably connected to a limiting block (24). The outer wall of the fixing block (22) is slidably connected to the sliding groove opened inside the limiting block (24). The inner wall of the connecting block (17) is threadedly connected to a threaded rod (18). One end of the threaded rod (18) is rotatably connected to the outer wall of the limiting block (24).

3. The apparatus for testing the thermal resistance of silicone grease according to claim 2, characterized in that: A cooling platform (25) is fixedly connected to the upper surface of the base (1), and a collection box (27) is fixedly connected to the inner wall of the base (1).

4. The apparatus for testing the thermal resistance of silicone grease according to claim 3, characterized in that: A cooling pipe (26) is fixedly connected to the upper surface of the collection box (27), and a water pump (28) is fixedly connected to the inner wall of the base (1).

5. The apparatus for testing the thermal resistance of silicone grease according to claim 4, characterized in that: The water pump (28) has a fixed connection to a connecting pipe (32) at its input end, and the water pump (28) has a fixed connection to one end of a cooling pipe (26) at its output end.

6. The apparatus for testing the thermal resistance of silicone grease according to claim 5, characterized in that: The other end of the cooling pipe (26) is fixedly connected to a copper pipe (30), and the inner wall of the collection box (27) is fixedly connected to a partition (31), which divides the inside of the collection box (27) into upper and lower parts.

7. The apparatus for testing the thermal resistance of silicone grease according to claim 6, characterized in that: Multiple heat dissipation fins (29) are fixedly connected to the upper surface of the partition (31), and the copper tube (30) is fixedly connected to the inner wall of the heat dissipation fins (29).

8. The apparatus for testing the thermal resistance of silicone grease according to claim 7, characterized in that: One end of the copper pipe (30) is fixedly connected to the lower half of the collection box (27), and one end of the connecting pipe (32) is fixedly connected to the lower half of the collection box (27).

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