Silver powder grinding and screening mechanism

Abstract

The utility model is suitable for the technical field of silver powder grinding, and provides a silver powder grinding and screening mechanism which comprises a grinding and screening box. The motor is fixed in the center of the bottom in the grinding and screening box through a bolt; the turntable is fixed at the output end of the motor; the grinding frustum is integrally formed in the center of the top of the rotary table; the conveying pipe is fixed in the center of the top of the grinding and screening box in a penetrating manner; the grinding cover is welded at the bottom end of the conveying pipe; the grinding cone groove is formed in the position, close to the outer side of the grinding cone table, of the center of the bottom of the grinding cover; silver powder which does not meet the particle size requirement is screened out through the first screening plate and the second screening plate, the silver powder is moved to the position between the grinding frustum and the grinding cone groove again through the conveying capacity of gas to the silver powder to achieve secondary grinding and even multiple times of grinding, the silver powder is evenly ground, the grinding efficiency is guaranteed, silver powder grinding and screening are integrated, and the silver powder grinding efficiency is improved. Machining time is greatly shortened, and production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of silver powder grinding, and particularly relates to a silver powder grinding and screening mechanism. Background Art

[0002] Conductive silver paste is mainly applied to fields such as printed circuits, semiconductor packaging, and solar cells, and is an important component of electronic products. Silver powder is a key material for conductive silver paste, and its content, particle size, and dispersion stability have a great impact on the performance of conductive silver paste. The particle size of silver powder is proportional to its metallic luster and covering power. Therefore, it is necessary to grind silver powder.

[0003] During the grinding process, when using equipment for grinding, the particle diameter distribution is uneven. Under some requirements for high particle size of silver powder, the processed silver powder will be screened after grinding. The silver powder that does not meet the requirements will be ground again. This method of separating grinding and screening requires a large amount of processing time, has low production efficiency, and is not conducive to the requirements of continuous production.

[0004] Therefore, a silver powder grinding and screening mechanism is proposed. Content of the Utility Model

[0005] The utility model provides a silver powder grinding and screening mechanism, aiming to solve the above problems.

[0006] The utility model is realized as follows: a silver powder grinding and screening mechanism, including: a grinding and screening box; a motor fixed to the center of the inner bottom of the grinding and screening box by bolts; a turntable fixed to the output end of the motor; a grinding frustum integrally formed at the center of the top of the turntable; a conveying pipe penetrating and fixed to the center of the top of the grinding and screening box; a grinding cover welded to the bottom end of the conveying pipe; a grinding frustum groove opened at the center of the bottom of the grinding cover near the outside of the grinding frustum; a feeding hopper welded to the top end of the conveying pipe; a hopper cover hinged to the top of the feeding hopper; a first screening plate, a second screening plate, and a blanking plate fixed to the inner side wall of the grinding and screening box near the lower side of the turntable by bolts, and the second screening plate is located between the first screening plate and the blanking plate; silver powder diversion covers respectively fixed to the outer side wall of the grinding and screening box near the lower sides of the first screening plate and the second screening plate by bolts; a leakage prevention filter screen embedded in the inner side wall of the silver powder diversion cover; and a blower cover fixed to the bottom of the silver powder diversion cover by bolts; a blower fixed to the inner side wall of the blower cover by bolts; and a feeding pipe connected in communication between the silver powder diversion cover and the feeding hopper.

[0007] Preferably, the output end of the motor penetrates through the first screening plate, the second screening plate, and the blanking plate.

[0008] Preferably, the angles between the first screening plate, the second screening plate and the blanking plate and the horizontal plane are all 30 degrees.

[0009] Preferably, both the grinding conical groove and the feeding hopper are communicated with the conveying pipe.

[0010] Preferably, the grinding frustum and the grinding conical groove are matched and fitted, and there is a gap between the grinding frustum and the grinding conical groove. Protruding particles are arranged on the outer side wall of the grinding frustum.

[0011] Preferably, both the feeding hopper and the silver powder diversion cover are communicated with the feeding pipe.

[0012] Preferably, air inlet holes are formed in the bottom of the blower cover, and filter holes are formed in the top of the feeding hopper.

[0013] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0014] The silver powder that does not meet the particle size requirements is screened out by the first screening plate and the second screening plate, and the conveying ability of the gas to the silver powder is utilized to move the silver powder to between the grinding frustum and the grinding conical groove again to achieve secondary grinding or even multiple grindings, so as to realize uniform grinding of the silver powder, ensure the grinding efficiency, and integrate silver powder grinding and screening, greatly shortening the processing time and improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic diagram of the cooperation between the grinding frustum and the grinding cover of the present utility model;

[0017] Figure 3 is a schematic diagram of the cooperation between the silver powder diversion cover and the blower cover of the present utility model;

[0018] Figure 4 is a schematic structural diagram of the turntable of the present utility model;

[0019] Figure 5 is a schematic structural diagram of the second screening plate of the present utility model.

[0020] In the figure: 1, grinding and screening box; 2, motor; 3, turntable; 4, grinding frustum; 5, conveying pipe; 6, grinding cover; 7, grinding conical groove; 8, feeding hopper; 9, hopper cover; 10, first screening plate; 11, second screening plate; 12, blanking plate; 13, silver powder diversion cover; 14, anti-leakage filter screen; 15, blower cover; 16, blower; 17, feeding pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] An embodiment of the present utility model provides a silver powder grinding and screening mechanism, as Figures 1-5As shown in the figure, it includes a grinding and screening box 1. At the central position of the inner bottom of the grinding and screening box 1, a motor 2 is fixedly connected by bolts. The motor 2 is fixedly connected with a turntable 3 through the output end on one side thereof. At the central position of the top of the turntable 3, a grinding frustum 4 is integrally formed. At the central position of the top of the grinding and screening box 1, a conveying pipe 5 is fixedly penetrated. The bottom end of the conveying pipe 5 is welded with a grinding cover 6. At the central position of the bottom of the grinding cover 6, a grinding frustum groove 7 is opened. The top end of the conveying pipe 5 is welded with a feeding hopper 8. Both the grinding frustum groove 7 and the feeding hopper 8 are communicated with the conveying pipe 5. The top of the feeding hopper 8 is hinged with a hopper cover 9, and the hopper cover 9 and the feeding hopper 8 are locked and connected. At the position below the turntable 3 on one inner wall of the grinding and screening box 1, a first screening plate 10 is fixedly connected by bolts. And at the position below the first screening plate 10 on the other inner wall of the grinding and screening box 1, a second screening plate 11 is fixedly connected by bolts. At the position below the second screening plate 11 on one inner wall of the grinding and screening box 1, a blanking plate 12 is fixedly connected by bolts. The output end of the motor 2 penetrates through the first screening plate 10, the second screening plate 11 and the blanking plate 12. At the position on the outer wall of the grinding and screening box 1, below the sides of the first screening plate 10, the second screening plate 11 and the blanking plate 12, a through groove is opened. On the outer side wall of the grinding and screening box 1, at the positions below the sides of the first screening plate 10 and the second screening plate 11, silver powder diversion covers 13 are fixedly connected by bolts. On the inner side wall of the silver powder diversion cover 13, a leak-proof filter screen 14 is embedded. And at the bottom of the silver powder diversion cover 13, a blower cover 15 is fixedly connected by bolts. On one inner wall of the blower cover 15, a blower 16 is fixedly connected by bolts. A feeding pipe 17 is connected in communication between the silver powder diversion cover 13 and the feeding hopper 8. Both the feeding hopper 8 and the silver powder diversion cover 13 are communicated with the feeding pipe 17.

[0024] It should be noted that during the existing silver powder grinding process, when using equipment for grinding, the particle diameter distribution is uneven. Under some requirements for high silver powder particle size, after grinding, the processed silver powder will be screened. The silver powder that does not meet the requirements will be ground again. This way of separating grinding and screening requires a lot of processing time, has low production efficiency, and is not conducive to the requirements of continuous production. In this embodiment, the silver powder that does not meet the particle size requirements is screened out through the first screening plate 10 and the second screening plate 11, and the conveying ability of the gas to the silver powder is utilized to make the silver powder move to between the grinding frustum 4 and the grinding frustum groove 7 again to realize secondary grinding or even multiple grindings, so as to realize the uniform grinding of the silver powder, ensure the grinding efficiency, and integrate silver powder grinding and screening, greatly shortening the processing time and improving the production efficiency.

[0025] Specifically, in this embodiment, the solution mainly includes a first screening plate 10 and a second screening plate 11. When performing the silver powder grinding and screening operation, the hopper cover 9 is opened, the silver powder raw material is poured into the feeding hopper 8, the hopper cover 9 is covered, and the silver powder raw material enters the grinding cone groove 7 inside the grinding cover 6 through the conveying pipe 5. The silver powder raw material falls on the grinding frustum 4, and the motor 2 drives the turntable 3 and the grinding frustum 4 to rotate at a high speed through the output end on one side. The silver powder raw material is squeezed and ground in the gap between the grinding frustum 4 and the grinding cone groove 7. The ground silver powder particles are thrown out under the action of centrifugal force, and the silver powder particles fall onto the first screening plate 10. Under the inclined guidance and screening action of the first screening plate 10, the silver powder with larger particles is intercepted above the first screening plate 10. The preliminarily screened silver powder particles fall onto the second screening plate 11. Under the inclined guidance and screening action of the second screening plate 11, the silver powder with smaller particles is intercepted above the second screening plate 11. The silver powder particles after re-screening fall onto the blanking plate 12 and are finally discharged from the grinding and screening box 1. The intercepted silver powder particles enter the silver powder diversion cover 13 and gather above the anti-leakage filter screen 14. After the fan 16 works, external air is drawn into the silver powder diversion cover 13, and the airflow blows the silver powder particles upward. The silver powder particles enter the feeding hopper 8 under the guidance of the feeding pipe 17, realizing the subsequent re-grinding and screening of the silver powder particles, thereby ensuring that the silver powder is ground and screened in components.

[0026] In a further preferred embodiment of the present invention, as Figure 1 shown, the angles between the first screening plate 10, the second screening plate 11 and the blanking plate 12 and the horizontal plane are all 30 degrees.

[0027] In this embodiment, through the first screening plate 10, the second screening plate 11 and the blanking plate 12 inclined at 30 degrees, the silver powder above the first screening plate 10, the second screening plate 11 and the blanking plate 12 can be moved to a lower place to achieve the purpose of screening.

[0028] In a further preferred embodiment of the present invention, as Figure 2 shown, the grinding frustum 4 and the grinding cone groove 7 match and fit, and there is a gap between the grinding frustum 4 and the grinding cone groove 7. Convex particles are provided on the outer side wall of the grinding frustum 4.

[0029] In this embodiment, due to the existence of the gap, the silver powder can be ground to the required size, and the convex particles are used to increase the friction force during the silver powder grinding, thereby ensuring that the silver powder is fully ground.

[0030] In a further preferred embodiment of the present invention, as Figure 1 shown, air inlet holes are provided at the bottom of the fan cover 15, and filter holes are provided at the top of the feeding hopper 8.

[0031] In this embodiment, through the setting of the filter holes, the excess air during the silver powder circulation can be discharged from the feeding hopper 8.

[0032] It should be noted that, for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present utility model is not limited by the described action sequence, because according to the present utility model, certain steps may be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present utility model.

[0033] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above-mentioned unit division may have other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0034] The units described as separate components above may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0035] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add or delete the features in the embodiments of the present utility model according to the situation, or make other adjustments, so as to obtain different technical solutions that are essentially not divorced from the concept of the present utility model. These technical solutions also belong to the scope of protection of the present utility model.

Claims

1. A silver powder grinding and screening mechanism, characterized in that: include: Grinding and screening box (1); A motor (2) fixed to the center of the bottom of the grinding and screening box (1) by bolts; A rotating disk (3) fixed to the output end of the motor (2); A grinding cone (4) integrally formed at the center of the top of the rotating disk (3); A conveying pipe (5) penetrating and fixed at the center of the top of the grinding and screening box (1); A grinding cover (6) welded to the bottom end of the delivery pipe (5); A grinding cone groove (7) is provided at a central position of the bottom of the grinding cover (6) and close to an outer position of the grinding cone (4); An upper hopper (8) welded to the top of the conveying pipe (5); A hopper cover (9) hinged to the top of the upper hopper (8); A first screening plate (10), a second screening plate (11) and a blanking plate (12) are fixed to the inner wall of the grinding and screening box (1) at a position below the rotating disk (3) by means of bolts, wherein the second screening plate (11) is located between the first screening plate (10) and the blanking plate (12); Silver powder guide covers (13) are fixed to the outer wall of the grinding and screening box (1) at positions below the sides of the first screening plate (10) and the second screening plate (11) by bolts respectively; an anti-leakage filter (14) embedded in the inner wall of the silver powder deflector (13); and A fan cover (15) fixed to the bottom of the silver powder deflector cover (13) by means of bolts; A fan (16) fixed to the inner wall of the fan cover (15) by bolts; A feeding pipe (17) is connected between the silver powder flow guide cover (13) and the upper hopper (8).

2. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: The output end of the motor (2) passes through the first screening plate (10), the second screening plate (11) and the blanking plate (12).

3. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: The angles between the first screening plate (10), the second screening plate (11) and the blanking plate (12) and the horizontal plane are all 30 degrees.

4. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: The grinding cone groove (7) and the upper hopper (8) are both connected to the conveying pipe (5).

5. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: The grinding cone (4) and the grinding cone groove (7) match each other, and there is a gap between the grinding cone (4) and the grinding cone groove (7). The outer side wall of the grinding cone (4) is provided with protruding particles.

6. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: The upper hopper (8) and the silver powder flow guide cover (13) are both connected to the feeding pipe (17).

7. A silver powder grinding and screening mechanism as claimed in claim 1, characterized in that: An air inlet hole is provided at the bottom of the fan cover (15), and a filter hole is provided at the top of the upper hopper (8).

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