Device for testing heat conductivity coefficient of silica gel material

Abstract

The invention discloses silica gel material heat conductivity coefficient testing equipment, and belongs to the technical field of heat conductivity coefficient testing, and the silica gel material heat conductivity coefficient testing equipment comprises a control cabinet body, the top end of the control cabinet body is provided with a protective cover, the protective cover is internally provided with a testing main body, and the protective cover is also internally provided with a drawing unit; and the drawing unit is used for assisting sample placement and automatic feeding work, and the position of the drawing unit corresponds to the position of the cold pole unit. The system has the beneficial effects that the drawing unit is arranged, the two sets of conveying units are arranged in the drawing unit, one set of conveying unit is used for placing a plurality of samples to be detected in advance, the other set of conveying unit can be used for placing the detected samples, and after one sample is tested, the system can automatically move out the detected samples; in the whole process, an operator does not need to frequently open and close the cover door, the manual intervention time of a single test is reduced to zero, and the test efficiency is greatly improved.

Description

Technical Field

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

[0002] The thermal conductivity testing equipment for silicone materials is a professional instrument used to measure the thermal conductivity of silicone. Its principle is based on Fourier's law of heat conduction. A constant temperature difference is established on both sides of the sample. After the temperature distribution reaches a steady state, the thermal conductivity of the material is calculated by measuring the heat flux density, sample thickness, and temperature difference. Since silicone is often used in high-reliability fields, its thermal management performance is crucial (such as heat dissipation of electronic and electrical equipment, new energy vehicles and energy storage systems, etc.). By testing the thermal conductivity of silicone, it is possible to measure whether the product has achieved the expected thermal conductivity of the design formula. In the specific testing process, the silicone sample to be tested first needs to be processed into the specified size. Then, the sample is manually placed between the heating unit and the cooling unit. By applying appropriate pressure, the three units are squeezed together. The heating unit heats the sample, while the cooling unit maintains a constant low temperature. After the system reaches a thermally stable state, the thermal conductivity can be calculated by data acquisition. However, in the current market, in order to obtain accurate and reliable statistical data of the sample, it is generally necessary to repeat the test on multiple sets of samples (such as 3 sets of 6 pieces). Each time the sample is changed, a complete cycle of opening the door, taking out the old sample, putting in the new sample, and closing the door and locking it is required. During the multiple opening and closing of the gate in the entire device, the sample needs to be manually positioned. The initial position and posture of the sample placed manually cannot guarantee that the position, pressure and contact state of the sample on the cold electrode unit are completely consistent each time. In addition, the frequent opening and closing of the gate will also cause fluctuations in the temperature field inside the device, requiring the equipment to readjust the temperature control. All of these processes directly affect the accuracy and consistency of the test. Summary of the Invention

[0003] One of the objectives of this application is to provide a device for testing the thermal conductivity of silicone materials, which addresses the problem that current thermal conductivity testing equipment requires operators to spend a lot of time frequently opening and closing the shutter, a process that is not only time-consuming and labor-intensive but also affects the final experimental results.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a silicone material thermal conductivity testing device, including a control cabinet, a protective cover at the top of the control cabinet, a testing body inside the protective cover, the testing body including columns, moving blocks, lifting components, pressure sensors, displacement sensors, a hot electrode unit and a cold electrode unit, two sets of columns symmetrically arranged inside the protective cover, and moving blocks arranged outside the two sets of columns, a pressure sensor at the top of the moving block, the top of the pressure sensor being connected to the bottom of the lifting component, a hot electrode unit being arranged directly below the moving block, a displacement sensor being arranged on the back of the hot electrode unit, a cold electrode unit being arranged below the hot electrode unit, and the outside of the cold electrode unit being connected to a constant temperature water bath unit through a pipe, and a pull-out unit being provided inside the protective cover for assisting in sample placement and automatic feeding, wherein the position of the pull-out unit corresponds to the position of the cold electrode unit.

[0005] Preferably, the protective cover is provided with a rotating door on the outside, and an observation window is provided on the outside of the door, with a sliding pull-out unit in the middle of the observation window.

[0006] Preferably, a fixing block is integrally installed at the bottom of the two columns, and a sliding pull-out unit is provided in the middle of the two fixing blocks, and the pull-out unit is electromagnetically locked to the fixing block.

[0007] Preferably, the pull-out unit is configured as a "U" shaped frame structure, with a vacuum adsorption unit located at its center and automatic conveying units on both sides. The vacuum adsorption unit performs adsorption and placement of the sample on the automatic conveying unit by rotating.

[0008] Preferably, the vacuum adsorption unit includes a mounting plate, a vacuum pump, a rotary motor, a connecting pipe, and a vacuum suction cup. The mounting plate is connected to the pull-out unit. A turntable connected to a bearing is provided at the top of the mounting plate. The bottom of the turntable is connected to the rotary motor. A vacuum pump is installed at the top of the turntable. A connecting pipe is provided at the top of the vacuum pump. A vacuum suction cup is provided at the top of the connecting pipe.

[0009] Preferably, the connecting tube is configured as an "L" shaped structure, and the center line of the vacuum chuck at its top coincides with the center line of the cold electrode unit.

[0010] Preferably, the automatic conveying unit is symmetrically arranged in two sets inside the pull-out unit, and it includes a fixed base and a feeding unit. The feeding unit is arranged inside the fixed base, and the feeding unit includes two rotating rollers and a conveyor belt. The conveyor belt is arranged outside the two rotating rollers. A reserved groove is provided on the surface of the conveyor belt for placing the sample. A tensioning mechanism is also provided below the conveyor belt for tension control.

[0011] Preferably, the external of one of the rotating rollers is controlled by a drive assembly, which includes a meshing gear, a drive gear, and a drive motor. The top of the drive motor is connected to the drive gear, and the drive gear is provided with a meshing gear meshing with it. The meshing gear is coaxially connected to the rotating roller.

[0012] Preferably, the feeding unit further includes a limiting plate, which is arranged in a trapezoidal structure, a sliding plate is installed on the inner side of the limiting plate, a telescopic component is provided at the bottom of the sliding plate, and a cooling unit is provided at the bottom of the limiting plate.

[0013] Preferably, the telescopic component is disposed in a rectangular groove inside the fixed seat, and the limiting plate is located in the middle position of the fixed seat.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: (1) It is equipped with a pull-out unit and two sets of conveying units inside. One set of conveying units is used to pre-place multiple silicone samples to be tested, while the other set of conveying units can be used to place the tested samples. After one test is completed, the system can automatically remove the tested sample and adsorb the next new sample to send to the test position. Throughout the process, there is no need for operators to frequently open and close the gate, reducing the manual intervention time of a single test to zero and greatly improving the efficiency of the test.

[0015] (2) A vacuum adsorption unit is provided, which can accurately place the silica gel sample to be tested above the cold electrode unit repeatedly, ensuring that the initial contact state between the sample and the electrode plate is consistent each time. With the automatic pressing setting of the lifting component, the contact thermal resistance between the sample and the electrode plate is more stable and reproducible, thereby improving the accuracy of the measurement and the consistency of the data.

[0016] (3) A limiting plate is set up to ensure that when the conveyor belt moves the sample, the surface of the sample can be completely parallel to the vacuum suction cup, so that the suction cup can accurately adsorb the sample and there will be no unstable adsorption phenomenon.

[0017] (4) A cooling unit is provided at the bottom of the limiting plate, which can force the sample to be tested conveyed on the conveyor belt to be cooled and stabilized at the set target temperature, ensuring that it will not be affected by the environment inside the protective cover when it is inside the protective cover, ensuring that each sample has a highly consistent and controllable initial temperature when it is sent into the test, fundamentally eliminating the systematic error caused by uneven preheating and different temperature rise, and ensuring data accuracy and repeatability. Attached Figure Description

[0018] Figure 1This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal main structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal rear structure of the present invention.

[0022] Figure 5 This is a partially enlarged structural diagram of the displacement sensor of the present invention.

[0023] Figure 6 This is a schematic diagram of the main structure of the pull-out unit of the present invention.

[0024] Figure 7 This is a schematic diagram of the back structure of the pull-out unit of the present invention.

[0025] Figure 8 This is a schematic diagram of the limiting plate structure of the present invention.

[0026] Figure 9 This is a schematic diagram of the driving component structure of the present invention.

[0027] Figure 10 This is a schematic diagram of the limiting plate structure from below in this invention.

[0028] In the diagram: 1. Control cabinet; 2. Protective cover; 21. Observation window; 3. Constant temperature water bath unit; 4. Pull-out unit; 5. Column; 51. Fixed block; 6. Moving block; 7. Lifting assembly; 8. Pressure sensor; 9. Displacement sensor; 10. Hot electrode unit; 11. Cold electrode unit; 12. Vacuum adsorption unit; 121. Mounting plate; 122. Vacuum pump; 123. Rotary motor; 124. Connecting pipe; 125. Vacuum suction cup; 13. Automatic conveying unit; 131. Fixed base; 132. Rotating roller; 133. Conveyor belt; 134. Limit plate; 1341. Sliding plate; 1342. Telescopic assembly; 135. Meshing gear; 136. Drive gear; 137. Drive motor. Detailed Implementation

[0029] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0031] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0032] One preferred embodiment of this application, such as Figures 1 to 10 As shown, a silicone material thermal conductivity testing device includes a control cabinet 1, a protective cover 2 at the top of the control cabinet 1, and a testing body inside the protective cover 2. The testing body includes columns 5, moving blocks 6, lifting components 7, pressure sensors 8, displacement sensors 9, a hot electrode unit 10, and a cold electrode unit 11. Two sets of columns 5 are symmetrically arranged inside the protective cover 2, and moving blocks 6 are arranged outside the two sets of columns 5. The pressure sensors 8 are arranged at the top of the moving blocks 6, and the top of the pressure sensors 8 is connected to the bottom of the lifting components 7. The hot electrode unit 10 is arranged directly below the moving blocks 6, and the displacement sensor 9 is arranged on the back of the hot electrode unit 10. The cold electrode unit 11 is arranged below the hot electrode unit 10, and the outside of the cold electrode unit 11 is connected to a constant temperature water bath unit 3 through a pipeline. A pull-out unit 4 is also provided inside the protective cover 2 to assist in the placement of samples and automatic feeding. The position of the pull-out unit 4 corresponds to the position of the cold electrode unit 11.

[0033] The protective cover 2 is provided with a rotating door on the outside, and an observation window 21 is provided on the outside of the door. A sliding pull-out unit 4 is provided in the middle of the observation window 21.

[0034] The pull-out unit 4 is set as a "U" shaped frame structure, and a vacuum adsorption unit 12 is set in the center of its interior, and automatic conveying units 13 are set on both sides. The vacuum adsorption unit 12 performs adsorption and placement of the sample on the automatic conveying unit 13 by rotating.

[0035] This application provides a silicone material thermal conductivity testing device with a pull-out unit 4. Specifically, in use, firstly, the control cabinet 1 is connected to the constant temperature water bath unit 3 via a pipeline. Then, after setting the parameters of the entire testing instrument, the operator only needs to disconnect the power to the pull-out unit 4 and pull it out. The silicone sample to be tested is placed on the automatic conveying unit 13 inside the pull-out unit 4. Then, under the action of the vacuum adsorption unit 12 inside the pull-out unit 4, the silicone sample on the automatic conveying unit 13 is transferred to the center position of the cold electrode unit 11 for placement. After placement, the lifting assembly 7 needs to be activated, which drives the pressure sensor 8 and the moving block 6 to descend, further driving the moving block 6 to descend. The hot electrode unit 10 at the bottom of block 6 descends to compress the sample. During this process, the temperatures of the cold electrode unit 11 and the hot electrode unit 10 need to be adjusted so that the overall temperature of the sample tends to the average temperature. The heat flow and temperature difference are continuously monitored. The system software will determine when the thermal stability state has been reached according to the steady-state judgment conditions set inside the control cabinet 1. The software will automatically start collecting data and record the data after the steady state is reached. Then, the thermal conductivity is automatically calculated according to Fourier's law of thermal conductivity to complete the test. Finally, the lifting component 7 drives the hot electrode unit 10 to rise, and the vacuum adsorption unit 12 adsorbs the sample after the test and transfers it to the top of another automatic conveying unit 13. The above work can be repeated to perform the test again.

[0036] The lifting assembly 7 can be used for the transmission of the motor lead screw, and the present invention does not impose any restrictions on this.

[0037] Furthermore, the hot electrode unit 10 has a heat spreader plate at the bottom and a heater on top for heating. Multiple sensors are arranged below to monitor and control the temperature uniformity at various points. The cold electrode unit 11 has a cooling plate at the top and a precision circulation channel in the middle. The circulation channel is connected to the constant temperature water bath unit 3. The constant temperature water bath unit 3 pumps a constant temperature coolant, usually water or ethylene glycol aqueous solution, into the channel to continuously and stably remove the heat conducted from the sample by the cold plate, thereby accurately maintaining the temperature of the cold plate at the set value. Temperature sensors are also evenly distributed inside the cooling plate to monitor and control the temperature uniformity of each sensor. This application does not impose any limitations on this; for details, please refer to the principle of the DRL-III silicone material thermal conductivity testing equipment.

[0038] Furthermore, according to Figure 3 , Figure 4 and Figure 5 As shown, a fixing block 51 is integrally installed at the bottom of the two columns 5, and a sliding pull-out unit 4 is provided in the middle of the two fixing blocks 51. The pull-out unit 4 and the fixing block 51 are electromagnetically locked together.

[0039] Specifically, an electromagnetic coil is installed in the groove inside the fixing block 51, and a conductive iron plate is installed on the slider outside the pull-out unit 4. After the pull-out unit 4 is completely inside the protective cover 2, it needs to be kept in an energized state so that the pull-out unit 4 can be completely attracted and prevent any shaking. When it is necessary to pull out later, the power supply of the electromagnetic coil can be cut off by the controller, so that the magnetic force disappears instantly.

[0040] Furthermore, during vacuum adsorption, according to Figure 5 and Figure 6 As shown, the vacuum adsorption unit 12 includes a mounting plate 121, a vacuum pump 122, a rotary motor 123, a connecting pipe 124, and a vacuum suction cup 125. The mounting plate 121 is connected to the pull-out unit 4. A turntable connected to a bearing is provided at the top of the mounting plate 121. The bottom of the turntable is connected to the rotary motor 123. The vacuum pump 122 is installed at the top. The connecting pipe 124 is provided at the top of the vacuum pump 122. The vacuum suction cup 125 is provided at the top of the connecting pipe 124.

[0041] The connecting tube 124 is configured with an "L" shape, and the center line of the vacuum suction cup 125 at its top coincides with the center line of the cold electrode unit 11.

[0042] Furthermore, during adsorption, the vacuum pump 122 needs to be started to establish a vacuum environment. Then, the sample on the automatic conveying unit 13 is adsorbed through the connecting pipe 124 and the vacuum suction cup 125. After adsorption is completed, when it is necessary to transfer the sample, the rotary motor 123 needs to be started to drive the turntable on the mounting plate 121 to rotate. When the turntable rotates, it will drive the entire vacuum pump 122 and the connecting pipe 124 to rotate, thereby completing the angle change.

[0043] Specifically, the shape of the vacuum suction cup 125 in this application can be changed according to the different shapes of the silicone sample. The replacement structure with the connecting tube 124 can be a threaded connection. The vacuum suction cup 125 can be made of porous ceramic or porous polymer, and concentric grooves, grid patterns or dotted textures can be processed on the suction cup contact surface. Through the texture, tiny airflow channels can be created between the suction cup and the silicone to help with the adsorption work.

[0044] During the transportation process, according to Figure 8 , Figure 9 and Figure 10As shown, two sets of automatic conveying units 13 are symmetrically arranged inside the pull-out unit 4, and each unit includes a fixed base 131 and a feeding unit. The feeding unit is arranged inside the fixed base 131, and the feeding unit includes two rotating rollers 132 and a conveyor belt 133. The conveyor belt 133 is arranged outside the two rotating rollers 132. A reserved groove is provided on the surface of the conveyor belt 133 for placing the sample. A tensioning mechanism is also provided below the conveyor belt 133 for tension control.

[0045] One of the rotating rollers 132 is controlled by a drive assembly, which includes a meshing gear 135, a drive gear 136, and a drive motor 137. The top of the drive motor 137 is connected to the drive gear 136. The drive gear 136 is provided with a meshing gear 135 that meshes with it. The meshing gear 135 is coaxially connected to the rotating roller 132.

[0046] Specifically, during transmission, the drive motor 137 needs to be started to drive the drive gear 136 to rotate. When it rotates, it will mesh with the meshing gear 135, which in turn drives the rotating roller 132 connected to it to rotate. When the rotating roller 132 rotates, in conjunction with the setting of the conveyor belt 133, the conveyor belt 133 will move. When it moves, it will complete the movement of the reserved groove at the top, and thus the sample inside the reserved groove can be moved.

[0047] In this application, the conveyor belt 133 and the rotating roller 132 can be toothed meshing.

[0048] The feeding unit also includes a limiting plate 134, which is arranged in a trapezoidal structure. A sliding plate 1341 is installed on the inner side of the limiting plate 134, a telescopic component 1342 is provided at the bottom of the sliding plate 1341, and a cooling unit is provided at the bottom of the limiting plate 134.

[0049] The telescopic component 1342 is set in a rectangular groove inside the fixed base 131, and the limiting plate 134 is located in the middle of the fixed base 131.

[0050] During the automatic sample adsorption process, firstly, the vacuum suction cup 125 reaches the position directly above the limiting plate 134, and the conveyor belt 133 performs normal conveying operations. After the conveyor belt 133 carries the sample to the bottom of the vacuum suction cup 125, the telescopic component 1342 needs to be activated, so that it drives the entire limiting plate 134 to rise through the sliding plate 1341, thereby lifting the conveyor belt 133, so that the sample and the vacuum suction cup 125 come into contact with each other, and then the adsorption operation can be carried out. The telescopic component 1342 can be an electric or pneumatic telescopic rod or a hydraulic cylinder.

[0051] In this application, the limiting plate 134 is provided with a circulation pipe inside. The water temperature in the cooling unit at its bottom needs to be consistent with the water temperature inside the constant temperature water bath unit 3. When the whole equipment is working, the liquid inside the cooling unit is continuously pumped into the circulation pipe for circulation, so as to complete the cooling work of the sample on the conveyor belt 133.

[0052] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A device for testing the thermal conductivity of silicone materials, characterized in that, The system includes a control cabinet (1), a protective cover (2) at the top of the control cabinet (1), and a test body inside the protective cover (2). The test body includes a column (5), a moving block (6), a lifting assembly (7), a pressure sensor (8), a displacement sensor (9), a hot electrode unit (10), and a cold electrode unit (11). Two sets of columns (5) are symmetrically arranged inside the protective cover (2), and a moving block (6) is arranged outside the two sets of columns (5). A pressure sensor (8) is arranged at the top of the moving block (6), and the pressure sensor (8) is... The top of the moving block (6) is connected to the bottom of the lifting assembly (7). A hot electrode unit (10) is provided directly below the moving block (6). A displacement sensor (9) is provided on the back of the hot electrode unit (10). A cold electrode unit (11) is provided below the hot electrode unit (10). The outside of the cold electrode unit (11) is connected to the constant temperature water bath unit (3) through a pipe. A pull-out unit (4) is also provided inside the protective cover (2) to assist in the placement of the sample and automatic feeding. The position of the pull-out unit (4) corresponds to the position of the cold electrode unit (11).

2. The device for testing the thermal conductivity of silicone material as described in claim 1, characterized in that: The protective cover (2) is provided with a rotating door on the outside, and an observation window (21) is provided on the outside of the door. A sliding pull-out unit (4) is provided in the middle of the observation window (21).

3. The silicone material thermal conductivity testing device as described in claim 2, characterized in that: The bottom of the two columns (5) is integrally installed with a fixing block (51), and a sliding pull-out unit (4) is provided in the middle of the two fixing blocks (51), and the pull-out unit (4) and the fixing block (51) are electromagnetically locked.

4. The device for testing the thermal conductivity of silicone material as described in claim 3, characterized in that: The pull-out unit (4) is configured as a "U" shaped frame structure, and a vacuum adsorption unit (12) is set in the center of its interior, and automatic conveying units (13) are set on both sides. The vacuum adsorption unit (12) performs adsorption and placement work on the sample on the automatic conveying unit (13) by rotating.

5. The device for testing the thermal conductivity of silicone material as described in claim 4, characterized in that: The vacuum adsorption unit (12) includes a mounting plate (121), a vacuum pump (122), a rotary motor (123), a connecting pipe (124), and a vacuum suction cup (125). The mounting plate (121) is connected to the pull-out unit (4). A turntable connected to a bearing is provided at the top of the mounting plate (121). The bottom of the turntable is connected to the rotary motor (123). The vacuum pump (122) is installed at the top. A connecting pipe (124) is provided at the top of the vacuum pump (122). A vacuum suction cup (125) is provided at the top of the connecting pipe (124).

6. The device for testing the thermal conductivity of silicone material as described in claim 5, characterized in that: The connecting tube (124) is configured as an "L" shaped structure, and the center line of the vacuum chuck (125) at its top coincides with the center line of the cold electrode unit (11).

7. The device for testing the thermal conductivity of silicone material as described in claim 4, characterized in that: The automatic conveying unit (13) is symmetrically arranged in two sets inside the pull-out unit (4), and includes a fixed base (131) and a feeding unit. The feeding unit is arranged inside the fixed base (131), and the feeding unit includes two rotating rollers (132) and a conveyor belt (133). The conveyor belt (133) is arranged outside the two rotating rollers (132). A reserved groove is provided on the surface of the conveyor belt (133) for placing the sample. A tensioning mechanism is also provided below the conveyor belt (133) for tension control.

8. The device for testing the thermal conductivity of silicone material as described in claim 7, characterized in that: One of the rotating rollers (132) is externally controlled by a drive assembly, which includes a meshing gear (135), a drive gear (136), and a drive motor (137). The top of the drive motor (137) is connected to the drive gear (136), and the drive gear (136) is externally provided with a meshing gear (135) that meshes with it. The meshing gear (135) is coaxially connected to the rotating roller (132).

9. The device for testing the thermal conductivity of silicone material as described in claim 8, characterized in that: The feeding unit also includes a limiting plate (134), which is arranged in a trapezoidal structure. A sliding plate (1341) is installed on the inner side of the limiting plate (134). A telescopic component (1342) is provided at the bottom of the sliding plate (1341). A cooling unit is provided at the bottom of the limiting plate (134).

10. The device for testing the thermal conductivity of silicone material as described in claim 9, characterized in that: The telescopic component (1342) is disposed in a rectangular groove inside the fixed base (131), and the limiting plate (134) is located in the middle position of the fixed base (131).

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