Automatic filling device for liquid metal composite heat-conducting silicone grease
Through the valveless filling process and high-precision pressure sensor control, the problem of poor filling accuracy of liquid metal composite thermal grease is solved, efficient and accurate liquid metal filling is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422668497.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-01
AI Technical Summary
Liquid metal composite thermal grease has high viscosity, high density and lack of fluidity, resulting in poor filling accuracy and high cost. It is easy to precipitate during conventional hydraulic extrusion, affecting production stability and efficiency.
The valve-free filling process is adopted, and high-precision pressure sensors and PLC control are used. The displacement of the filling needle push rod is measured by the pressure sensor, and the pressure in the silicone grease container is controlled by the solenoid valve to achieve volumetric filling and eliminate overshoot and back suction at the end of filling.
High-precision filling of liquid metal composite thermal grease is achieved with an error of less than ±2%, which greatly improves filling efficiency and accuracy and reduces production costs.
Smart Images
Figure CN223396406U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of high-viscosity and high-density material filling, in particular to an automatic filling device for liquid metal composite thermal conductive silicone grease. Background Art
[0002] Traditional paste materials (such as ordinary thermal grease, toothpaste, and glue) are relatively thin, have low viscosity and density, and have good fluidity under the action of air pressure or hydraulic thrust. Due to the low value of these materials, the accuracy requirements for each filling are not high. Such materials usually use valves (such as dispensing valves and pipe pressure valves) to control the filling accuracy of each needle.
[0003] Compared to traditional silicone grease, liquid metal composite thermal grease has high viscosity, high density, poor fluidity, and is expensive at room temperature. When using conventional hydraulic extrusion and valve-controlled filling, the valve installation increases resistance to the grease's movement, requiring higher pressure to expel the grease. High pressure destabilizes the liquid metal composite thermal grease, causing the compound to precipitate easily. The impact of valve actuation can also squeeze out any remaining grease, affecting filling accuracy and significantly impacting production costs.
[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0005] In order to solve the technical problems of high viscosity, high density, no fluidity, expensive and poor packaging accuracy of liquid metal composite thermal conductive silicone grease at room temperature in the prior art, an automatic filling device for liquid metal composite thermal conductive silicone grease is provided.
[0006] The utility model provides an automatic filling device for liquid metal composite thermal conductive silicone grease, comprising:
[0007] A silicone grease container, the outlet of which is provided with an outlet connector;
[0008] a dispensing needle tube, which is detachably connected to the outlet of the silicone grease container via the outlet connector;
[0009] A pressure sensor, the position of which corresponds to the position of the push rod of the dispensing needle;
[0010] The silicone grease pushing device is connected to the silicone grease containing container.
[0011] In some embodiments, a device bracket is further included, and the silicone grease container, the dispensing needle and the pressure sensor are detachably fixed on the device bracket.
[0012] In some embodiments, the pressure sensor is capable of moving left and right, and up and down along the equipment support.
[0013] In some embodiments, the pressure sensor can move left and right, up and down, and front and back along the equipment support.
[0014] The specific form of the device capable of moving the pressure sensor is not limited, and any device capable of moving the pressure sensor in two or three dimensions, such as an XYZ slide rail, can be used to align the pressure sensor with the push rod of the filling needle and maintain a corresponding distance.
[0015] In some embodiments, a piston is provided in the silicone grease container.
[0016] In some embodiments, the silicone grease container is equipped with a pressure sensor.
[0017] In some embodiments, the silicone grease pushing device includes a compressor air tank, which is connected to the inlet of the silicone grease container through a pipeline.
[0018] In some embodiments, the pipeline includes a first pipeline and a second pipeline, and the first pipeline and the second pipeline are connected through a three-way joint;
[0019] One end of the first pipeline is connected to the inlet of the silicone grease container, and the other end is connected to the first interface of the three-way connector;
[0020] One end of the second pipeline is connected to the outlet of the compressor air storage tank, and the other end is connected to the second interface of the three-way connector;
[0021] The third interface of the three-way connector is connected to the pressure relief pipeline.
[0022] In some embodiments, a first solenoid valve is provided on the second pipeline, and a second solenoid valve is provided on the pressure relief pipeline.
[0023] In some embodiments, the pressure sensor is disposed on the first pipeline or the pressure relief pipeline.
[0024] Compared with the prior art, the technical effects achieved by the present invention are as follows:
[0025] (1) A high-precision pressure sensor is used to measure the displacement of the filling needle push rod, and a valve-free (no valve at the outlet of the silicone grease container) filling process is adopted. The pressure sensor is controlled by a programmable logic controller (PLC) to detect the pressure in the silicone grease container. The solenoid valve is used to control the pressure in the silicone grease container and release the stress of the liquid metal composite thermal conductive silicone grease in time, eliminating the overfilling caused by the overshoot of the silicone grease at the end of filling or the insufficient filling caused by the back suction, thereby ensuring the filling accuracy of the equipment. The filling error of each needle is less than ±2%.
[0026] (2) The utility model adopts a volume measurement method without valve control technology. It collects the moving distance of the filling needle through a pressure sensor for quantitative filling. It adopts PLC control to realize the automatic filling technology of high-viscosity liquid metal composite thermal conductive silicone grease, replacing manual high-precision filling and greatly improving the filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;
[0028] In the picture:
[0029] 1- Compressed air storage tank; 2- First solenoid valve; 3- Second solenoid valve; 4- Pressure sensor; 5- Three-way connector; 6- Silicone grease container; 601- Composite thermal grease; 602- Piston; 7- Pressure relief pipe; 8- Outlet connector; 9- Dispensing needle; 901- Push rod; 10- Pipeline; 1001- First pipeline; 1002- Second pipeline; 11- Pressure sensor; 12- Equipment bracket. DETAILED DESCRIPTION
[0030] The technical solutions of the present invention are described below by means of specific embodiments in conjunction with the accompanying drawings. It should be understood that one or more steps mentioned in the present invention do not exclude the presence of other methods and steps before and after the combined steps, or other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. Unless otherwise specified, the numbering of each method step is only for the purpose of identifying each method step, and does not limit the order of arrangement of each method or limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships can also be regarded as the scope of implementation of the present invention without substantial changes in the technical content.
[0031] The sources of the raw materials and instruments used in the examples are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.
[0032] like Figure 1As shown, a liquid metal composite thermal conductive silicone grease automatic filling device includes:
[0033] The silicone grease container 6 is used to contain composite thermally conductive silicone grease (such as liquid metal composite thermally conductive silicone grease), and an outlet connector 8 is provided at the outlet thereof, and a piston is provided inside.
[0034] The dispensing needle tube 9 is detachably connected to the outlet of the silicone grease container 6 via the outlet connector 8 , and a push rod 901 is provided inside the needle tube.
[0035] The pressure sensor 11 is positioned corresponding to the push rod 901. It can move left and right, and up and down, along the equipment bracket 12 to align with the push rod 901 of the dispensing needle 9. The high-precision pressure sensor 11 measures the initial and final displacements of the push rod 901 of the dispensing needle 9. The actual displacement of the push rod 901 is calculated by the PLC and converted into the filling weight per syringe based on the actual displacement. This method can compensate for filling errors caused by inconsistent initial needle lengths.
[0036] A silicone grease pushing device is connected to a silicone grease container 6 and includes a compressor air tank 1. The compressor air tank is connected to the inlet of the silicone grease container 6 via a pipeline 10. The pipeline 10 includes a first pipeline 1001 and a second pipeline 1002. The first pipeline 1001 and the second pipeline 1002 are connected via a three-way joint 5. One end of the first pipeline 1001 is connected to the inlet of the silicone grease container 6, and the other end is connected to the first interface of the three-way joint 5.
[0037] One end of the second pipeline 1002 is connected to the outlet of the compressor air storage tank 1, and the other end is connected to the second interface of the three-way connector 5;
[0038] The third interface of the three-way connector 5 is connected to the pressure relief pipeline 7 .
[0039] The second pipeline 1002 is provided with a first solenoid valve 2 , and the pressure relief pipeline 7 is provided with a second solenoid valve 3 .
[0040] The automatic filling device for liquid metal composite thermal conductive silicone grease further comprises an equipment bracket 12 , on which the silicone grease container 6 , the dispensing needle 9 and the pressure sensor 11 are detachably fixed.
[0041] In order to monitor the pressure in the silicone grease container 6 , the silicone grease container 6 is further provided with a pressure sensor 4 , which is arranged on the pressure relief pipe 7 .
[0042] In order to realize automation, each component of the present invention is controlled by PLC.
[0043] The working method of the above-mentioned liquid metal composite thermal conductive silicone grease automatic filling device is as follows:
[0044] Liquid metal composite thermal conductive silicone grease 601 is placed in the silicone grease container 6 and filled tightly. After installing the piston 602, the silicone grease container 6 is fixed to the equipment bracket 12. The outlet of the silicone grease container 6 is connected to the canned needle tube 9 through the outlet connector 8 (such as a bolt and nut). The position of the pressure sensor 11 is adjusted so that it is facing the push rod 901 of the canned needle tube 9.
[0045] Start the canning button. The compressed air storage tank 1 mainly provides compressed air and keeps the outlet pressure constant at a certain required value. The first solenoid valve 2 is opened, the second solenoid valve 3 is closed, and the silicone grease container 6 is connected through the pipeline 10. The compressed air is delivered to the silicone grease container 6 to push the piston 602 in the silicone grease container 6 to squeeze out the liquid metal composite thermal conductive silicone grease 601 to fill the sub-filling needle tube 9. As the canning progresses, the push rod 901 in the sub-filling needle tube 9 gradually withdraws from the sub-filling needle tube 9. The PLC receives the movement distance of the push rod 901 fed back by the pressure sensor 11 in real time. When the net movement distance of the push rod 901 is equal to the set value, the PLC controls the first solenoid valve 2 to close the air source.
[0046] The second solenoid valve 3 is controlled to open to release the air pressure inside the silicone grease container 6. When the pressure decays to a certain value, the second solenoid valve 3 is closed in time to ensure that the liquid metal composite thermal conductive silicone grease 601 does not overflow or suck back. The system maintains this air pressure constant. The filling completion indicator lights up, and the filling of the dispensing syringe is completed;
[0047] Remove the packaged needle tube 9, reinstall a new package needle tube 9, and continue the package according to the above process.
[0048] The use of a valveless filling process can reduce the pressure of air pushing the silicone grease. If there is no valve control in the pipeline, excessive silicone grease overflow or back-absorption will occur at the end of filling each syringe, resulting in large filling errors. The utility model uses the method of relieving the internal pressure of the silicone grease container 6 to eliminate the errors caused by excessive silicone grease overflow or back-absorption. Specific implementation method: The pressure inside the silicone grease container 6 is collected in real time by the pressure sensor 4. When each syringe is filled to the required weight, the first solenoid valve 2 is controlled to close and cut off the air source, and the opening of the second solenoid valve 3 is controlled to exhaust and remove the pressure in the silicone grease container 6 in time. In order to prevent silicone grease from being sucked back, an appropriate pressure must be maintained in the silicone grease container 6. This pressure value needs to ensure that the liquid metal composite thermal conductive silicone grease at the outlet does not overflow or be sucked back when filling is completed. The pressure sensor 4 collects the pressure signal in real time and transmits the signal to the PLC controller. After the system performs logical operations, it outputs a signal to control the first solenoid valve 2 and the second solenoid valve.
[0049] During the filling process, the pressure of the compressed air must be kept constant. The specific real-time method is to feed back the pressure signal of the compressed air storage tank 1 outlet to the PLC. When the pressure of the compressed air storage tank 1 fluctuates, the PLC sends a signal to control the start and stop of the air compressor to maintain constant air pressure. It can also be directly equipped with a constant pressure air source for filling.
[0050] In some embodiments, the pressure sensor 4 is disposed on the first pipeline 1001 and is capable of providing a pressure signal in the silicone grease container 6 .
[0051] In some embodiments, the device may also be directly provided with a three-dimensional moving device, so that the pressure sensor 4 can move left and right, up and down, and forward and backward along the device bracket, and can more accurately correspond to the position of the push rod 901 of the canned needle tube 9.
[0052] The automatic filling device and the working method provided by the utility model can also be used for the automatic filling of high-viscosity products such as silica gel and conductive glue.
[0053] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.
[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0055] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.
Claims
1. An automatic filling device for liquid metal composite thermal grease, characterized in that: include: A silicone grease container, the outlet of which is provided with an outlet connector; a dispensing needle tube, which is detachably connected to the outlet of the silicone grease container via the outlet connector; A pressure sensor, the position of which corresponds to the position of the push rod of the dispensing needle; The silicone grease pushing device is connected to the silicone grease containing container.
2. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 1, characterized in that: It also includes an equipment bracket, and the silicone grease container, the dispensing needle tube and the pressure sensor can be detachably fixed on the equipment bracket.
3. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 2, characterized in that: The pressure sensor can move left and right and up and down along the equipment bracket.
4. The automatic filling device for liquid metal composite thermal grease according to claim 2, characterized in that: The pressure sensor can move left and right, up and down, and front and back along the equipment bracket.
5. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 1, characterized in that: A piston is arranged in the silicone grease container.
6. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 1, characterized in that: The silicone grease container is equipped with a pressure sensor.
7. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 6, characterized in that: The silicone grease pushing device comprises a compressor air storage tank, which is connected to the inlet of the silicone grease container through a pipeline.
8. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 7, characterized in that: The pipeline includes a first pipeline and a second pipeline, and the first pipeline and the second pipeline are connected through a three-way joint; One end of the first pipeline is connected to the inlet of the silicone grease container, and the other end is connected to the first interface of the three-way connector; One end of the second pipeline is connected to the outlet of the compressor air storage tank, and the other end is connected to the second interface of the three-way connector; The third interface of the three-way connector is connected to the pressure relief pipeline.
9. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 8, characterized in that: A first solenoid valve is provided on the second pipeline, and a second solenoid valve is provided on the pressure relief pipeline.
10. The automatic filling device for liquid metal composite thermal conductive silicone grease according to claim 8, characterized in that: The pressure sensor is arranged on the first pipeline or the pressure relief pipeline.