A heat-conducting silica gel sheet mixing device

Abstract

This utility model discloses a thermally conductive silicone sheet mixing device, comprising: a device body and a liquid silicone feeding mechanism, a thermally conductive material powder feeding mechanism, a PLC control mechanism, and a stirring mechanism, all mounted on the device body and working in cooperation with each other. The thermally conductive material powder feeding mechanism is located on the upper part of the device body and includes a thermally conductive material powder feeding hopper. The stirring mechanism includes a stirring motor, the output shaft of which is connected to a stirring shaft, and the end of the stirring shaft is connected to stirring blades. This embodiment of the thermally conductive silicone sheet mixing device, through various structural improvements, lowers the overall center of gravity of the equipment by placing the stirring mechanism at the bottom of the device body, making the equipment more stable during high-speed stirring operation. The liquid silicone feeding mechanism and the thermally conductive material powder feeding mechanism are independently set and both located on the upper part of the device, allowing operators to flexibly select the feeding sequence and amount according to process requirements, thereby improving mixing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of silicone mixing devices, and in particular to a thermally conductive silicone sheet mixing device. Background Technology

[0002] Thermally conductive silicone pads are a key thermal interface material widely used in electronics, new energy vehicles, LED lighting, and other fields. Their performance directly affects the heat dissipation and lifespan of electronic components. The production of thermally conductive silicone pads typically begins with the thorough and uniform mixing of liquid silicone with a high proportion of thermally conductive fillers, such as alumina, boron nitride, and other additives. This mixing process is crucial in determining the final product's thermal conductivity, insulation performance, and mechanical properties. Current technologies use manual feeding or simple centralized feeding ports, with liquid and powder added simultaneously or sequentially from a single inlet. When a high proportion of thermally conductive powder comes into contact with liquid silicone, it easily undergoes severe moisture absorption, agglomeration, and localized pre-reaction near the inlet and on the bin walls, forming difficult-to-disperse lumpy pre-condensed materials. Common stirring motors often employ top-mounted or side-mounted drives, using a long stirring shaft to drive the blades at the bottom. This layout results in a high center of gravity, causing significant radial oscillation and vibration when stirring high-viscosity, high-solids-content silicone mixtures. This not only generates noise but also severely impacts the lifespan of transmission components and the stability of the equipment. Utility Model Content

[0003] To address the aforementioned technical problems, the thermally conductive silicone sheet mixing device provided by this utility model, through various structural improvements, lowers the overall center of gravity of the equipment by placing the stirring mechanism at the bottom of the device body in a lower drive layout. This makes the equipment more stable and reduces vibration during high-speed mixing, effectively extending the service life of the motor and bearings. The liquid silicone feeding mechanism and the thermally conductive material powder feeding mechanism are set up independently and are both located at the top of the device, allowing operators to flexibly select the feeding sequence and amount according to process requirements. This makes mixing more flexible, improves mixing efficiency, and avoids local pre-reaction.

[0004] This utility model is achieved using the following technical solution:

[0005] A thermally conductive silicone sheet mixing device includes: a device body and a liquid silicone feeding mechanism, a thermally conductive material powder feeding mechanism, a PLC control mechanism, and a stirring mechanism, all mounted on the device body and cooperating with each other; the device body includes a base plate, an upper barrel, a lower barrel, and a barrel cover, with the upper barrel and the lower barrel communicating with each other; the liquid silicone feeding mechanism includes a conveying pipe, the outlet of which leads to the upper barrel.

[0006] The thermally conductive material powder feeding mechanism is located on the upper part of the device body;

[0007] The thermally conductive material powder feeding mechanism includes a thermally conductive material powder feeding hopper; the PLC control mechanism includes a control box, a control switch and a display screen mounted on the control box.

[0008] The stirring mechanism is located at the bottom of the device body. The stirring mechanism includes a stirring motor fixed to the base plate. The output shaft of the stirring motor is connected to a stirring shaft, and the end of the stirring shaft is connected to stirring blades.

[0009] Preferably, the upper barrel is cylindrical and the lower barrel is conical; the upper barrel and the lower barrel are interconnected.

[0010] Preferably, the stirring blade is integrally formed from the blade root, the blade horizontal section, and the blade arc section; the blade arc section fits into the inner wall of the lower barrel.

[0011] Preferably, the liquid silicone feeding mechanism further includes a check valve and a liquid flow meter, both of which are installed on the conveying pipe.

[0012] Preferably, the liquid silicone feeding mechanism further includes a storage tank and a liquid pump, both of which are mounted on the base plate. The bottom of the storage tank is connected to the inlet of the liquid pump, and the outlet of the liquid pump is connected to the delivery pipe.

[0013] Preferably, the thermally conductive material powder feeding hopper is disposed on the barrel cover, and the outlet of the thermally conductive material powder feeding hopper is connected through the upper barrel body; a dry powder solenoid valve is provided at the bottom of the thermally conductive material powder feeding hopper.

[0014] Preferably, the top of the thermally conductive material powder feeding hopper is provided with a removable dust filter cover.

[0015] Preferably, the device body is provided with a heating mechanism, which includes a heater disposed at the bottom of the outer wall of the lower barrel and a temperature sensor disposed on the outer wall of the lower barrel.

[0016] Preferably, the heater is annular and is located at the center of the bottom of the outer wall of the lower barrel.

[0017] Preferably, the bottom of the lower barrel is provided with a discharge solenoid valve and a discharge pipe that are connected to each other.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The thermally conductive silicone sheet mixing device in this embodiment features several structural improvements. The lower-mounted drive layout, with the stirring mechanism positioned at the bottom of the device body, lowers the overall center of gravity, resulting in greater stability and less vibration during high-speed mixing, effectively extending the service life of the motor and bearings. The liquid silicone feeding mechanism and the thermally conductive material powder feeding mechanism are independently configured and both located at the top of the device, allowing operators to flexibly select the feeding sequence and quantity according to process requirements. The dustproof filter cover on the powder feeding hopper and the airtight design of the entire mixing process effectively prevent the thermally conductive powder from flying away. The modular structure of the device body makes it easy to disassemble and assemble when cleaning, replacement, or maintenance is required, reducing the difficulty and time cost of daily maintenance and minimizing equipment downtime. Attached Figure Description

[0020] Figure 1 This is a front-view stereoscopic structural diagram of this embodiment;

[0021] Figure 2 This is a schematic diagram of the left-side stereoscopic structure of this embodiment;

[0022] Figure 3 This is a bottom-view three-dimensional structural diagram of this embodiment;

[0023] Figure 4 This is a rear-view stereoscopic structural diagram of this embodiment;

[0024] Figure 5 This is a top view of the lower barrel structure in this embodiment;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the stirring blade in this embodiment.

[0026] Explanation of the reference numerals in the figure:

[0027] 1. Device body; 11. Base plate; 12. Upper barrel; 13. Lower barrel; 14. Barrel lid; 15. Discharge solenoid valve; 16. Discharge pipe; 17. Support rod;

[0028] 2. Liquid silicone feeding mechanism; 21. Conveying pipe; 22. Check valve; 23. Liquid flow meter; 24. Storage tank; 25. Liquid pump;

[0029] 3. Thermal conductive material powder feeding mechanism; 31. Thermal conductive material powder feeding hopper; 32. Dry powder solenoid valve; 33. Dustproof filter cover;

[0030] 5. PLC control mechanism; 51. Control box; 52. Control switch; 53. Display screen;

[0031] 6. Stirring mechanism; 61. Stirring motor; 62. Stirring shaft; 63. Stirring blades; 64. Blade root; 65. Horizontal section of blade; 66. Arc-shaped section of blade;

[0032] 7. Heating mechanism; 71. Heater; 72. Temperature sensor. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and 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.

[0034] See Figures 1 to 6 The thermally conductive silicone sheet mixing device provided in this embodiment includes: a device body 1 and a liquid silicone feeding mechanism 2, a thermally conductive material powder feeding mechanism 3, a PLC control mechanism 5, and a stirring mechanism 6, all mounted on the device body 1 and cooperating with each other; the device body 1 includes a base plate 11, an upper barrel 12, a lower barrel 13, and a barrel cover 14, with the upper barrel 12 and the lower barrel 13 communicating with each other; the liquid silicone feeding mechanism 2 includes a conveying pipe 21, the outlet of which leads to the upper barrel 12; the thermally conductive material powder... The feeding mechanism 3 is located on the upper part of the device body 1; the thermal conductive material powder feeding mechanism 3 includes a thermal conductive material powder feeding hopper 31; the PLC control mechanism 5 includes a control box 51, a control switch 52 and a display screen 53 located on the control box 51; the stirring mechanism 6 is located on the lower part of the device body 1, and the stirring mechanism 6 includes a stirring motor 61 fixed on the bottom plate 11, the output shaft of the stirring motor 61 is connected to a stirring shaft 62 extending into the lower barrel 13, and the end of the stirring shaft 62 is connected to a stirring blade 63.

[0035] The thermally conductive silicone sheet mixing device in this embodiment features several structural improvements. The lower-mounted drive layout, with the stirring mechanism located at the bottom of the main body, lowers the overall center of gravity of the equipment, resulting in greater stability and less vibration during high-speed mixing, effectively extending the service life of the motor and bearings. The liquid silicone feeding mechanism and the thermally conductive material powder feeding mechanism are independently configured and both located at the top of the device, allowing operators to flexibly select the feeding sequence and quantity according to process requirements. The modular structure facilitates easy disassembly and assembly for cleaning or maintenance, reducing the difficulty and time cost of daily maintenance.

[0036] See Figures 1 to 6 The thermal conductive silicone sheet mixing device provided in this embodiment includes: a device body 1 and a liquid silicone feeding mechanism 2, a thermal conductive material powder feeding mechanism 3, a PLC control mechanism 5, and a stirring mechanism 6, which are disposed on the device body 1 and work together with each other.

[0037] The device body 1 includes: a base plate 11, an upper barrel 12, a lower barrel 13, and a barrel lid 14; the above multiple parts constitute a mixing chamber; the upper barrel 12 and the lower barrel 13 are interconnected, the upper barrel 12 is cylindrical, and the lower barrel 13 is conical; the upper barrel 12 is provided with an openable and closable barrel lid 14.

[0038] In this embodiment, the upper barrel 12 can also be omitted, and only the lower barrel 13 needs to be set to complete the mixing of a smaller amount of thermally conductive silicone, thereby improving the mixing efficiency and the utilization rate of the device.

[0039] The bottom of the lower barrel 13 is provided with a discharge solenoid valve 15 and a discharge pipe 16 that are connected to each other.

[0040] The liquid silicone feeding mechanism 2 includes a conveying pipe 21, on which a check valve 22 is provided, and the outlet of the conveying pipe 21 leads to the upper barrel 12; the liquid silicone feeding mechanism 2 also includes a liquid flow meter 23, which is installed on the conveying pipe 21.

[0041] The liquid flow meter in this embodiment can monitor and provide feedback on the volumetric flow rate of the liquid silica gel flowing through the delivery pipe in real time and with high precision; based on this feedback signal, the PLC can control the timing of shutting down the liquid pump; the amount of liquid silica gel added is digitally controlled with high precision and low feeding error.

[0042] See Figures 1 to 4 In this embodiment, the liquid silicone feeding mechanism 2 further includes a storage tank 24 and a liquid pump 25. Both the storage tank 24 and the liquid pump 25 are mounted on the base plate 11. The bottom of the storage tank 24 is connected to the inlet of the liquid pump 25, and the outlet of the liquid pump 25 is connected to the delivery pipe 21. In this embodiment, two sets of the liquid silicone feeding mechanism 2 are provided, capable of conveying two different liquids.

[0043] See Figures 1 to 4 In this embodiment, the thermally conductive material powder feeding mechanism 3 is disposed on the upper part of the device body 1; the thermally conductive material powder feeding mechanism 3 includes a thermally conductive material powder feeding hopper 31, the bottom of the thermally conductive material powder feeding hopper 31 is provided with a dry powder solenoid valve 32, the thermally conductive material powder feeding hopper 31 is disposed on the bucket cover 14, and the outlet of the thermally conductive material powder feeding hopper 31 is connected to the upper bucket body 12.

[0044] In this embodiment, the liquid silicone feeding mechanism and the thermal conductive material powder feeding mechanism are set up independently and are both located at the top of the device, allowing operators to flexibly select the feeding sequence and feeding amount according to process requirements.

[0045] The top of the thermally conductive material powder feeding hopper 31 is provided with a removable dust filter cover 33, which includes breathable cotton that can filter out tiny particles.

[0046] See Figures 1 to 4 In this embodiment, the PLC control mechanism 5 includes a control box 51, a control switch 52 and a display screen 53 mounted on the control box 51; the control box 51 is electrically connected to the control switch 52, the display screen 53, the liquid flow meter 23, the liquid pump 25, the dry powder solenoid valve 32, the stirring motor 61, the discharge solenoid valve 15, the heater 71 and the temperature sensor 72; the control box 51 has a built-in PLC controller for precisely controlling the feeding amount, mixing temperature, stirring speed and time and the discharge timing.

[0047] See Figures 1 to 4 In this embodiment, the stirring mechanism 6 is located at the lower part of the device body 1. The stirring mechanism 6 includes a stirring motor 61 fixed on the bottom plate 11. The output shaft of the stirring motor 61 is connected to a stirring shaft 62 that extends into the lower barrel 13. The end of the stirring shaft 62 is connected to a stirring blade 63.

[0048] See Figures 5 to 6 In this embodiment, the stirring blade 63 is integrally formed from a blade root 64, a horizontal blade section 65, and a curved blade section 66; the curved blade section 66 is in contact with the inner wall of the lower barrel 13; the shape of the stirring blade 63 can effectively handle the mixing of high-viscosity materials and avoid dead zones in the mixing. In this embodiment, the stirring blade 63 can also be replaced with a spiral blade.

[0049] See Figures 1 to 4 In this embodiment, the heating mechanism 7 includes a heater 71 disposed at the bottom of the outer wall of the lower barrel 13 and a temperature sensor 72 disposed on the outer wall of the lower barrel 13; the heater 71 is annular and is disposed at the center of the bottom of the outer wall of the lower barrel 13.

[0050] The working process of this embodiment is as follows: initialization and parameter setting. The operator starts the equipment through the control switch 52 on the control box 51 and inputs the process parameters required for this production through the display screen 53, including: the amount of liquid silicone, the amount of thermally conductive powder, the mixing temperature setting, the stirring speed and time, the total mixing time, etc.

[0051] When liquid silica gel is fed, the PLC issues a command to start the liquid pump 25. The liquid silica gel is pumped from the storage tank 24 into the cavity formed by the upper barrel 12 and the lower barrel 13 through the delivery pipe 21. The liquid flow meter 23 monitors the volume of the liquid flowing through in real time and feeds the signal back to the PLC. When the flow rate reaches the set value, the PLC immediately shuts off the liquid pump 25 to complete the precise liquid dosing. The check valve 22 prevents the material from flowing back.

[0052] When the thermally conductive powder is fed, the PLC issues a command to open the dry powder solenoid valve 32; the powder that has been pre-added to the thermally conductive material powder feeding hopper 31 falls into the mixing chamber under the action of gravity; usually all the powder is fed in.

[0053] The amount of powder can also be controlled by controlling the opening time of the solenoid valve or by combining it with a loss-in-weight scale; the dust filter cover 33 balances the air pressure inside the hopper during the feeding process and prevents dust from escaping; it can also prevent external dust from entering during long-term operation of the device.

[0054] In the heating and mixing process, during or after feeding, the PLC controls the heater 71 to work based on the actual temperature inside the silo fed back by the temperature sensor 72, so that the material temperature is stabilized at the preset value, thereby reducing viscosity and improving mixing efficiency; it can also avoid overheating caused by traditional heaters.

[0055] During the mixing process, the PLC starts the stirring motor 61, which drives the stirring shaft 62 and the stirring blades 63 at its end to rotate at high speed. The blades, which are modified according to the viscosity of liquid silica gel, simultaneously generate radial shear and axial lifting effects on the material, quickly breaking up powder agglomerates and ensuring that the thermally conductive filler and liquid silica gel are fully and evenly mixed, avoiding dead zones. The stirring blades 63 are in close contact with the outer wall of the lower tank 13, ensuring that the mixing can be fully carried out even when the amount of material is small. The entire mixing time is controlled by the PLC timing.

[0056] After the mixing process is completed, the PLC controls the stirring motor 61 to stop working; the PLC opens the discharge solenoid valve 15, and under the push of gravity or stirring blades 63, the uniformly mixed material is discharged through the discharge pipe 16 and enters the next process, such as calendering; after the material is completely discharged, the solenoid valve 15 closes, and the equipment is ready to start the next production cycle.

[0057] The thermally conductive silicone sheet mixing device in this embodiment features several structural improvements that reduce unnecessary connectors and enhance the overall rigidity and stability of the equipment. The lower-mounted drive layout of the stirring mechanism at the bottom of the main body lowers the overall center of gravity, resulting in smoother operation and less vibration during high-speed mixing, effectively extending the service life of the motor and bearings. The liquid silicone feeding mechanism and the thermally conductive material powder feeding mechanism are independently configured and both located at the top of the device, allowing operators to flexibly select the feeding sequence and quantity according to process requirements. The dustproof filter cover of the powder feeding hopper and the airtightness of the entire mixing process effectively prevent the thermally conductive powder from flying away. The modular structure of the main body makes the equipment easy to disassemble and assemble when cleaning, replacement, or maintenance is required, reducing the difficulty and time cost of daily maintenance and minimizing equipment downtime.

[0058] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A heat conductive silicone sheet mixing device, comprising: The device body comprises a liquid silicone feeding mechanism, a thermally conductive material powder feeding mechanism, a PLC control mechanism, and a stirring mechanism, all of which work in cooperation with each other and are mounted on the device body. The device body includes a base plate, an upper barrel, a lower barrel, and a lid, with the upper and lower barrels communicating with each other. The liquid silicone feeding mechanism includes a conveying pipe with its outlet leading to the upper barrel. The thermally conductive material powder feeding mechanism is located on the upper part of the device body and includes a thermally conductive material powder feeding hopper. The PLC control mechanism includes a control box, a control switch, and a display screen. The stirring mechanism is located on the lower part of the device body and includes a stirring motor fixed to the base plate. The output shaft of the stirring motor is connected to a stirring shaft, and the end of the stirring shaft is connected to stirring blades.

2. The heat conductive silicone sheet mixing device according to claim 1, wherein: The upper barrel is cylindrical, and the lower barrel is conical; the upper barrel and the lower barrel are interconnected.

3. The heat conductive silicone sheet mixing device according to claim 2, wherein: The stirring blade is integrally formed from the blade root, the blade horizontal section, and the blade arc section; the blade arc section fits into the inner wall of the lower barrel.

4. The heat conductive silicone sheet mixing device according to claim 1, wherein: The liquid silicone feeding mechanism also includes a check valve and a liquid flow meter, both of which are installed on the conveying pipe.

5. The thermally conductive silicone sheet mixing device according to claim 1, characterized in that: The liquid silicone feeding mechanism also includes a storage tank and a liquid pump. Both the storage tank and the liquid pump are mounted on the base plate. The bottom of the storage tank is connected to the inlet of the liquid pump, and the outlet of the liquid pump is connected to the delivery pipe.

6. The thermally conductive silicone sheet mixing device according to claim 1, characterized in that: The thermally conductive material powder feeding hopper is located on the barrel cover, and the outlet of the thermally conductive material powder feeding hopper is connected to the upper barrel body; a dry powder solenoid valve is provided at the bottom of the thermally conductive material powder feeding hopper.

7. The thermally conductive silicone sheet mixing device according to claim 6, characterized in that: The top of the thermally conductive material powder feeding hopper is equipped with a removable dust filter cover.

8. The thermally conductive silicone sheet mixing device according to claim 1, characterized in that: The device body is provided with a heating mechanism, which includes a heater disposed at the bottom of the outer wall of the lower barrel and a temperature sensor disposed on the outer wall of the lower barrel.

9. The thermally conductive silicone sheet mixing device according to claim 8, characterized in that: The heater is circular and is located at the center of the bottom of the outer wall of the lower barrel.

10. The thermally conductive silicone sheet mixing device according to claim 1, characterized in that: The bottom of the lower barrel is equipped with a discharge solenoid valve and a discharge pipe that are connected to each other.

Images