Conductive silver paste preparation device

Abstract

The utility model relates to the technical field of conductive silver paste preparation, and particularly discloses a conductive silver paste preparation device which comprises a bottom plate, a first fixing frame is arranged on the bottom plate, a stirring barrel is fixedly connected to the first fixing frame, and a feeding port and a discharging port are formed in the upper end and the lower end of the stirring barrel respectively. A first plug and a second plug are clamped at the feeding port and the discharging port respectively, a second fixing frame is fixedly connected to the first fixing frame, a hydraulic rod with the telescopic end perpendicular to the axis of the stirring barrel is arranged on the second fixing frame, and a high-speed shearing and stirring mechanism used for stirring conductive silver paste in the stirring barrel is arranged on the hydraulic rod; and the high-speed shearing and stirring mechanism is provided with a compression roller grinding mechanism for grinding the conductive silver paste, so that the technical problem that the dispersing capacity of the conductive silver paste is insufficient due to the fact that the stirring mode of an existing conductive silver paste preparation device is too single is solved.

Description

Technical Field

[0001] This utility model relates to the field of conductive silver paste preparation technology, and specifically discloses a conductive silver paste preparation device. Background Technology

[0002] The conductive silver paste preparation device is used to produce conductive silver paste. Conductive silver paste is mainly composed of silver powder, organic solvent and binder. It has high conductivity and stability and is widely used in electronic packaging, solar cells, flexible circuit boards and other fields. By adjusting the proportion, particle size and type of additives of silver powder, the rheological properties and curing properties of conductive silver paste can be optimized to meet the needs of different application scenarios.

[0003] For example, utility model patent CN222530094U discloses a conductive silver paste preparation device, including a stirring tank. The top of the stirring tank is equipped with a motor for power supply, a valve for controlling the mixing ratio, and a storage tank for storing solvent. The bottom of the stirring tank is equipped with a support for stability. This conductive silver paste preparation device, through the coordinated arrangement of the stirring tank and motor, reduces the adhesion of silver paste to the interior after preparation, avoiding affecting the quality of subsequent silver paste preparations. The stirring tank facilitates the injection of silver paste raw materials and allows for faster removal of the prepared silver paste. The motor, through rotation, stirs the silver paste, enabling faster and more uniform mixing, and also scrapes the silver paste from the inner wall of the stirring tank, increasing the device's working efficiency.

[0004] Although existing conductive silver paste preparation devices reduce residue by using a motor-driven scraping structure, their conventional stirring mode lacks a precision grinding module. The preparation device relies solely on the low-speed stirring of traditional paddles, and the resulting shear stress cannot break through the mechanical deagglomeration threshold of hard silver powder agglomerates. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a conductive silver paste preparation device to solve the technical problem that the stirring mode of the existing conductive silver paste preparation device is too simple, resulting in insufficient dispersion ability of conductive silver paste.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a base plate, on which a first fixing frame is mounted. A mixing tank is fixedly connected to the first fixing frame. The mixing tank has an inlet and an outlet at its upper and lower ends, respectively. A first plug and a second plug are respectively fitted at the inlet and outlet. A second fixing frame is fixedly connected to the first fixing frame. A hydraulic rod with its telescopic end perpendicular to the axis of the mixing tank is mounted on the second fixing frame. A high-speed shearing stirring mechanism for stirring the conductive silver paste in the mixing tank is mounted on the hydraulic rod. A pressure roller grinding mechanism for grinding the conductive silver paste is mounted on the high-speed shearing stirring mechanism. Through the synergistic action of the high-speed shearing stirring mechanism and the pressure roller grinding mechanism, the conductive silver paste can be fully ground during the stirring process, improving grinding efficiency and quality.

[0007] Furthermore, the high-speed shearing and mixing mechanism includes a crossbar fixedly connected to the telescopic end of the hydraulic rod. Two connecting devices are mounted on the crossbar, penetrating the mixing tank. A disc, with a radius smaller than the inner diameter of the mixing tank, is located inside the mixing tank. A first motor, perpendicular to the axis of the mixing tank, is mounted on the mixing tank. A first rotating rod is fixedly connected to the power output shaft of the first motor. A high-speed dispersing disc is fixedly connected to the end of the first rotating rod away from the first motor. The high-speed dispersing disc is located inside the mixing tank, and an annulus that fits the outer edge of the disc is provided on the inner wall of the mixing tank. The high-speed shearing and mixing mechanism rapidly disperses and grinds the silver powder into smaller particles through the shearing action of the high-speed dispersing disc. The hydraulic rod drives the entire high-speed shearing and mixing mechanism to descend, feeding the conductive silver paste into the pressure roller grinding mechanism for fine grinding, eliminating the contamination risk caused by material transfer in traditional separate equipment.

[0008] Furthermore, both connecting devices include a cylinder fixedly connected to the crossbar. A connecting rod is provided on the cylinder, one end of which is slidably disposed inside the cylinder, and the other end of which passes through the mixing tank and is fixedly connected to the disc. A spring is provided between the connecting rod and the cylinder, and a limit ring is provided inside the cylinder on the connecting rod. The connecting devices serve to drive the overall movement of the disc and prepare for the subsequent vibration of the disc by the pressure roller grinding mechanism.

[0009] Furthermore, the disc is equipped with a flow guiding device, which includes two fixed posts fixedly connected to the lower end face of the disc, and a flow guiding plate is mounted on each post. The flow guiding device can accurately deliver the conductive silver paste stirred by the high-speed shearing and stirring mechanism to the pressure roller grinding mechanism.

[0010] Furthermore, the roller grinding mechanism includes two sliders. An annular groove is provided inside the mixing tank, and two sliders are slidably arranged within the annular groove. Two grinding blocks are fixedly connected to each of the two sliders. A bidirectional hydraulic rod is fixedly connected between the two grinding blocks, and a connecting column is provided on the bidirectional hydraulic rod. A second motor is provided at the lower end of the disc, and a second rotating rod is fixedly connected to the power output shaft of the second motor. The second rotating rod is slidably arranged in a fitting groove on the connecting rod. Two top rods are provided on each of the two grinding blocks, and the two top rods can cooperate with several protrusions provided on the lower end face of the disc. The roller grinding mechanism further grinds the initially dispersed conductive silver paste through the crushing and squeezing action of the grinding blocks, making its particles finer and more uniform. The rotation and pressure of the grinding blocks effectively refine the silver powder particles, ensuring a more uniform particle size distribution of the conductive silver paste. The sliders in the annular groove ensure the stability of the grinding block movement, and the cooperation design of the top rods and protrusions effectively prevents the conductive silver paste from sticking to the disc.

[0011] This further grinding process can significantly improve the conductivity and adhesion of the conductive silver paste, meeting the needs of high-precision applications.

[0012] The working principle and beneficial effects of this solution are as follows:

[0013] When conductive silver paste needs to be prepared, the hydraulic rod is activated to move the crossbar, causing the disc to fit with the ring and seal the gap. The raw material is then injected through the feed inlet. During initial mixing, the high-speed dispersion disc quickly disperses and grinds the raw material. After mixing, the hydraulic rod moves the disc, and the conductive silver paste is guided through the guide plate between the grinding block and the inner wall of the mixing tank. At this time, the second motor is activated to drive the second rotating rod to rotate. The second rotating rod drives the connecting column to rotate. When the connecting column rotates, it drives the bidirectional hydraulic rod to rotate. When the bidirectional hydraulic rod rotates, it drives the grinding blocks at both ends to rotate. The grinding blocks move on the annular groove inside the mixing tank via a slider to ensure stability during rotation. During rotation, the grinding blocks begin to grind the conductive silver paste between the inner wall of the mixing tank and the grinding blocks. By adjusting the extension and retraction of the bidirectional hydraulic rod, the distance between the grinding blocks and the inner wall of the mixing tank can be controlled to control the fineness of the grinding of the conductive silver paste. Under the action of gravity, the conductive silver paste will gradually fall to the bottom wall of the mixing tank during the grinding process. At this time, the ground conductive silver paste can be discharged through the discharge port.

[0014] The high-speed dispersion disc can quickly and evenly disperse the silver powder in the conductive silver paste, initially grinding it into smaller particles, which provides a good foundation for subsequent fine grinding. Driven by a bidirectional hydraulic rod, the grinding block moves in a circular motion along the inner wall of the mixing tank, further refining the conductive silver paste raw material, ensuring uniform particle size distribution, and improving the dispersion ability of the conductive silver paste.

[0015] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0017] Figure 2 This is a front sectional view of an embodiment;

[0018] Figure 3 Exploded view of the high-speed shearing and stirring mechanism and the pressure roller grinding mechanism in the embodiment;

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0020] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0021] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0022] Figure 7 This is an exploded view of the second rotating rod and connecting column in the embodiment;

[0023] Figure 8 This is a schematic diagram of the disk, protrusion, and push rod structure in an embodiment;

[0024] Figure 9 This is a schematic diagram of the mixing tank and the first stopper structure in an embodiment;

[0025] Figure 10 This is a schematic diagram of the mixing tank and the second stopper in an embodiment.

[0026] The following are the markings in the attached diagram: base plate 1, first fixed frame 2, mixing tank 3, first plug 4, second plug 5, second fixed frame 6, hydraulic rod 7, feed inlet 8, discharge outlet 9, crossbar 10, disc 11, first fixed platform 12, first motor 13, first rotating rod 14, high-speed dispersing disc 15, ring 16, cylinder 17, connecting rod 18, limiting ring 19, spring 20, fixed rod 21, guide plate 22, slider 23, grinding block 24, bidirectional hydraulic rod 25, protective frame 26, connecting column 27, second fixed platform 28, second motor 29, second rotating rod 30, mating groove 31, annular slide groove 32, top rod 33, protrusion 34. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] Example

[0029] like Figures 1 to 10 As shown, a conductive silver paste preparation device is disclosed, including a base plate 1, a first fixed frame 2, a stirring tank 3, a first plug 4, a second plug 5, a second fixed frame 6, a hydraulic rod 7, a high-speed shearing and stirring mechanism, and a pressure roller grinding mechanism. The first fixed frame 2 is mounted on the base plate 1, and the stirring tank 3 is fixedly connected to the first fixed frame 2. The upper end of the stirring tank 3 has a feed inlet 8, and the first plug 4 is fitted at the feed inlet 8. The lower end of the stirring tank 3 has a discharge outlet 9, and the second plug 5 is fitted at the discharge outlet 9. The second fixed frame 6 is mounted on the first fixed frame 2, and the hydraulic rod 7 is fixedly connected to the second fixed frame 6. The telescopic end of the hydraulic rod 7 is perpendicular to the axis of the stirring tank 3. A high-speed shearing and stirring mechanism is mounted on the hydraulic rod 7 to pre-stir the conductive silver paste raw materials in the stirring tank 3. A pressure roller grinding mechanism is mounted on the high-speed shearing and stirring mechanism to grind the conductive silver paste. Figure 1 , Figure 9 and Figure 10 As shown.

[0030] The high-speed shearing and mixing mechanism includes a crossbar 10, two connecting devices, a disc 11, a first fixed platform 12, a first motor 13, a first rotating rod 14, a high-speed dispersing disc 15, a ring 16, and a flow guiding device. The hydraulic rod 7 is fixedly connected to the crossbar 10 at its telescopic end. Two connecting devices are mounted on the crossbar 10, with one end of each device fixedly connected to the crossbar 10. The other end of each device penetrates the mixing tank 3 and is connected to the disc 11. The radius of the disc 11 is smaller than the radius of the inner wall of the mixing tank 3, forming an annular gap. The first fixed platform 12 is mounted on the mixing tank 3. A first motor 13 is provided, with its output shaft perpendicular to the axis of the mixing tank 3. The output shaft of the first motor 13 is fixedly connected to a first rotating rod 14 via a coupling. The first rotating rod 14 passes through the mixing tank 3, and a high-speed dispersion disc 15 is mounted on the first rotating rod 14. The high-speed dispersion disc 15 is located inside the mixing tank 3. A circular ring 16 is fixedly connected to the inner wall of the mixing tank 3, and the ring 16 is precisely fitted into the annular space with a clearance fit between the outer edge of the disc 11 and the inner wall of the mixing tank 3, forming a dynamic seal. A flow guiding device is provided at the lower end of the disc 11 to guide the conductive silver paste, such as... Figure 2 and Figure 3 As shown.

[0031] Both connecting devices include a cylinder 17, a connecting rod 18, a limiting ring 19, and a spring 20. The cylinder 17 is fixedly connected to the lower end face of the crossbar 10. A slidable connecting rod 18 is installed inside the cylinder 17. One end of the connecting rod 18 is located inside the cylinder 17, and the other end passes through the mixing tank 3 and is fixedly connected to the disc 11. A limiting ring 19 is fixedly connected to the connecting rod 18, located inside the cylinder 17. A spring 20 is installed between the cylinder 17 and the connecting rod 18. One end of the spring 20 is fixedly connected to the upper end face inside the cylinder 17, and the other end is fixedly connected to the upper end face of the connecting rod 18. Figure 2 and Figure 4 As shown.

[0032] The flow guiding device includes two fixed rods 21 and a flow guiding disk 22. Two fixed rods 21 are fixedly connected to the lower end face of the disk 11, and a flow guiding disk 22 is fixedly connected to the lower end of each fixed rod 21. The flow guiding disk 22 is a hollow cone shape. Figure 2 and Figure 3 As shown.

[0033] The roller grinding mechanism includes two sliders 23, two grinding blocks 24, a bidirectional hydraulic rod 25, a protective frame 26, a connecting column 27, a second fixed platform 28, a second motor 29, a second rotating rod 30, and a vibration device. An annular groove 32 is provided inside the mixing tank 3, and two slidable sliders 23 are installed within the annular groove 32. Two grinding blocks 24 are fixedly connected to the two sliders respectively. A bidirectional hydraulic rod 25 is positioned between the two grinding blocks 24. A protective frame 26 is fitted onto the bidirectional hydraulic rod 25, and a connecting column 27 is fixedly connected to the protective frame 26. A fitting groove 31 is provided inside the connecting column 27. A second fixed platform 28 is fixedly connected to the lower end face of the disc 11. A second motor 29 is installed on the second fixed platform 28. The power output shaft of the second motor 29 is perpendicular to the axis of the mixing tank 3. The power output shaft of the second motor 29 is fixedly connected to the second rotating rod 30 via a coupling. The second rotating rod 30 is slidably positioned within the fitting groove 31. Figure 5 , Figure 7 and Figure 8 As shown.

[0034] The vibration device includes two push rods 33 and several protrusions 34. Two push rods 33 are respectively provided on the side of the two grinding blocks 24 away from the two sliders 23. Several protrusions 34 are fixedly connected to the lower end face of the disc 11. The two push rods 33 can cooperate with the several protrusions 34, such as... Figure 6 As shown.

[0035] In practice

[0036] When it is time to start preparing conductive silver paste, first activate the hydraulic rod 7 on the second fixed frame 6. The hydraulic rod 7 drives the crossbar 10 to move away from the mixing tank 3. At this time, the crossbar 10 will drive the cylinder 17 and the connecting rod 18 to move. The connecting rod 18 is equipped with a limit ring 19 to prevent the connecting rod 18 from coming out of the cylinder 17. When the cylinder 17 and the connecting rod 18 move, the disc 11 will move to fit with the ring 16, sealing the gap between the disc 11 and the mixing tank 3. At this time, the first plug 4 on the mixing tank 3 can be pulled out, and the raw materials for making conductive silver paste can be injected into the mixing tank 3 on the first fixed frame 2 through the feed port 8. After the raw materials are injected, the first plug 4 can be re-inserted into the feed port 8 to prevent the raw materials from escaping during the stirring process.

[0037] After the conductive silver paste material is injected, the first motor 13 on the first fixed platform 12 is started. The first motor 13 drives the first rotating rod 14 to rotate. When the first rotating rod 14 rotates, it drives the high-speed dispersion disk 15 to rotate at high speed in the mixing tank 3. At this time, the high-speed dispersion disk 15 performs preliminary stirring on the conductive silver paste material on the disc 11. The high-speed dispersion disk 15 can quickly disperse and initially grind the conductive silver paste material. After the preliminary stirring is completed, the hydraulic rod 7 on the second fixed frame 6 is started to move the crossbar 10 to the side closer to the mixing tank 3. When the crossbar 10 moves, it drives the disc 11 to the side closer to the bottom plate 1. As the disc 11 moves, the hydraulic rod 7 stops working after the protrusions 34 on the lower end face of the disc 11 move to contact the top rod 33 on the grinding block 24. When the disc 11 moves, it will also stop engaging with the ring 16. At this time, the conductive silver paste accumulated on the disc 11 will fall from the edge of the disc 11 and onto the guide plate 22. Since the guide plate 22 is fixedly connected to the disc 11 by the fixing rod 21, the guide plate 22 will move with the disc 11 when the disc 11 moves. The conductive silver paste can be accurately guided into the space between the grinding block 24 and the inner wall of the mixing tank 3 through the guide plate 22.

[0038] After the conductive silver paste is guided by the guide plate 22 to the space between the grinding block 24 and the mixing tank 3, the second motor 29 on the second fixed platform 28 is started. The second motor 29 drives the second rotating rod 30 to rotate. Since the second rotating rod 30 is slidably set in the fitting groove 31 on the connecting column 27, the second rotating rod 30 can move up and down within the fitting groove 31. The fitting groove 31 restricts the rotation of the second rotating rod 30. When the second rotating rod 30 rotates, it drives the connecting column 27 to rotate. When the connecting column 27 rotates, it drives the bidirectional hydraulic rod 25 in the protective frame 26 to rotate. When the bidirectional hydraulic rod 25 rotates, it drives... The grinding blocks 24 at both ends rotate, and at this time, the grinding blocks 24 will move on the annular groove 32 inside the mixing tank 3 via the slider 23. During the rotation, the grinding blocks 24 will begin to finely grind the conductive silver paste. By adjusting the extension and retraction of the bidirectional hydraulic rod 25, the distance between the grinding blocks 24 and the inner wall of the mixing tank 3 can be controlled to control the fineness of the grinding of the conductive silver paste. Under the action of gravity, the conductive silver paste will gradually fall to the bottom wall of the mixing tank 3 during the grinding process. At this time, the second plug 5 at the bottom of the mixing tank 3 can be pulled out, and the ground conductive silver paste will be discharged through the discharge port 9.

[0039] As the grinding block 24 rotates, it also drives the push rod 33 to rotate. Since a spring 20 is provided between the connecting rod 18 on the disc 11 and the cylinder 17, the rotation of the push rod 33 will cause the protrusion 34 to be continuously pushed up, thereby driving the connecting rod 18 on the disc 11 to compress the spring 20 and generate axial displacement, which causes the disc 11 to vibrate, making the conductive silver paste on the disc 11 fall more quickly between the mixing tank 3 and the grinding block 24.

[0040] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A conductive silver paste preparation apparatus, characterized in that: The device includes a base plate, on which a first fixing frame is provided. A mixing tank is fixedly connected to the first fixing frame. The mixing tank has an inlet and an outlet at its upper and lower ends, respectively. A first plug and a second plug are respectively fitted at the inlet and the outlet. A second fixing frame is fixedly connected to the first fixing frame. A hydraulic rod with its telescopic end perpendicular to the axis of the mixing tank is provided on the second fixing frame. A high-speed shearing stirring mechanism for stirring the conductive silver paste in the mixing tank is provided on the hydraulic rod. A pressure roller grinding mechanism for grinding the conductive silver paste is provided on the high-speed shearing stirring mechanism.

2. The conductive silver paste preparation apparatus according to claim 1, characterized in that: The high-speed shearing and stirring mechanism includes a crossbar, which is fixedly connected to the telescopic end of the hydraulic rod. Two connecting devices are provided on the crossbar, and the two connecting devices pass through the stirring tank. A disc is provided inside the stirring tank, and the radius of the disc is smaller than the inner diameter of the stirring tank. A first motor perpendicular to the axis of the stirring tank is provided on the stirring tank. A first rotating rod is fixedly connected to the power output shaft of the first motor. A high-speed dispersing disc is fixedly connected to the end of the first rotating rod away from the first motor. The high-speed dispersing disc is located inside the stirring tank, and an annulus that fits the outer edge of the disc is provided on the inner wall of the stirring tank.

3. The conductive silver paste preparation apparatus according to claim 2, characterized in that: Both of the connecting devices include a cylinder, which is fixedly connected to the crossbar. A connecting rod is provided on the cylinder, one end of which is slidably disposed inside the cylinder, and the other end of which passes through the mixing tank and is fixedly connected to the disc. A spring is provided between the connecting rod and the cylinder, and a limit ring is provided inside the cylinder on the connecting rod.

4. The conductive silver paste preparation apparatus according to claim 3, characterized in that: The disk is provided with a flow guiding device, which includes two fixed columns. The two fixed columns are fixedly connected to the lower end face of the disk, and a flow guiding plate is provided on the fixed columns.

5. The conductive silver paste preparation apparatus according to claim 4, characterized in that: The pressure roller grinding mechanism includes two sliders. An annular groove is provided inside the mixing tank, and the two sliders are slidably arranged in the annular groove. Two grinding blocks are fixedly connected to the two sliders respectively. A bidirectional hydraulic rod is fixedly connected between the two grinding blocks. A connecting column is provided on the bidirectional hydraulic rod. A second motor is provided at the lower end of the disc. A second rotating rod is fixedly connected to the power output shaft of the second motor. The second rotating rod is slidably arranged in a fitting groove opened on the connecting rod. Two push rods are provided on the two grinding blocks respectively. The two push rods can cooperate with several protrusions provided on the lower end face of the disc.

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