CN203862166U - Reaction kettle provided with stirrer and used for preparing silver powder - Google Patents

Abstract

The utility model discloses a reaction kettle with a stirrer for preparing silver powder, which comprises an outer kettle body, an inner kettle body arranged in the outer kettle body, and a stirrer arranged in the inner kettle body. The agitator includes a stirring Shaft, the bottom of the stirring shaft is provided with a bottom stirring body, and the bottom stirring body is provided with four bottom stirring blades which are mutually symmetrically distributed in a cross shape and are tilted up to the upper end. The outline of the bottom stirring blades includes There is a vertical wall at the top and an arc-shaped wall connected to the bottom of the vertical wall, and the stirring shaft is also provided with a stirring wheel in linkage, which is located on the inner side of the inclined transition wall of the bottom stirring blade, and the stirring wheel It includes a disc-shaped wheel body, and a plurality of arc-shaped wing plates are uniformly arranged on the inner circumference of the wheel body at intervals. The utility model has the advantages of reasonable structure setting, and can effectively prevent the problem of mutual adhesion caused by mutual accumulation of silver powders, and improve the quality of silver powders prepared by chemical reduction.

Description

A kind of reaction kettle with agitator for preparing silver powder

technical field

The utility model relates to a reaction kettle with a stirrer for preparing silver powder.

Background technique

As the most commonly used conductive material for electronic paste, ultra-fine silver powder is not only used in traditional component electrode paste and hybrid integrated circuit paste, but also in new application fields including solar cell paste, RFID silver paste, PDP silver paste, etc. Therefore, its preparation technology has been greatly developed. Liquid phase method, solid phase method and gas phase method are all used for research, but the most commonly used and most economical large-scale production method is still the liquid phase reduction method.

The Chinese Patent Publication No. 102407341A that the applicant previously applied for is a preparation method of a surface-modified particle-size mixed silver powder and a surface-modified particle-size mixed silver powder. The aqueous solution containing the surface modifier, the alcohol solution containing the surface modifier, and the aqueous solution containing the reducing agent are mixed and reacted in a reactor with a high-shear stirrer to reduce to form silver powder. Due to the high density of silver powder, during the reaction process, the silver powder as the heavy phase continuously accumulates to the bottom of the reactor, thus causing the silver powders generated by reduction to bond with each other during the accumulation process, resulting in the particle size of the silver powder being too large , unable to meet the requirements for configuring silver paste. And the agitator installed in the existing reaction kettle generally all relies on the propeller to stir, although this structure is comparatively simple, but the agitation force produced by the propeller pushes to the outside of the propeller, and the silver powder is often reduced after being generated. It is piled up to the bottom and layered vertically, so the propeller cannot stir the silver powder evenly quickly.

Contents of the invention

The purpose of this utility model is to overcome the shortcomings and deficiencies of the prior art, and to provide a kind of reaction kettle with agitator for preparing silver powder that can stir the silver powder quickly to prevent the accumulation of silver powder and cause the problem of mutual adhesion of silver powder .

In order to achieve the above object, the technical solution of the utility model is to include an outer kettle body, an inner kettle body arranged in the outer kettle body, and an agitator arranged in the inner kettle body, the agitator includes a stirring shaft, and the The upper end of the inner kettle body is provided with a seal and a kettle cover, and the kettle cover is provided with a feeding port, and the upper end of the stirring shaft extends out of the kettle cover and a stirring shaft driving mechanism for driving the stirring shaft to rotate is provided in conjunction with it, It is characterized in that: the bottom of the agitating shaft is provided with a bottom agitating body, and the bottom agitating body is provided with four bottom agitating blades which are symmetrically distributed across each other and tilted up to the upper end. The profile includes a vertical wall on the upper part and an arc-shaped wall connected to the bottom of the vertical wall. The vertical wall is adjacent to the inner wall of the inner kettle body, and the inner profile of the bottom stirring blade is arranged obliquely inward. There is an inclined transition wall, and the stirring shaft is also provided with a stirring wheel in linkage, the stirring wheel is located on the inner side of the inclined transition wall of the bottom stirring blade, and the stirring wheel includes a disc-shaped wheel body, the said wheel A plurality of arc-shaped wing plates are evenly distributed on the inner circumference of the periphery of the body.

With this setting, when the stirring shaft rotates, the bottom stirring blade and the stirring wheel are driven at the same time, and the silver powder in the inner kettle body is tumbling upwards under the action of the bottom stirring blade. Under the pressure of the inner wall of the inner kettle body, the raised silver powder moves towards the direction of the stirring shaft, thereby entering into the stirring wheel, and performing multi-directional shear dispersion on the arc-shaped wing plate of the stirring wheel. Therefore, the utility model The silver powder can be quickly stirred in the inner kettle body, which can effectively prevent the accumulation of the silver powder and cause the problem of mutual adhesion of the silver powder, and improve the preparation quality of the silver powder.

A further setting is that the width of the arc-shaped wall of the bottom stirring blade gradually decreases from top to bottom. With this setting, the arc-shaped wall of the bottom stirring blade forms a shape similar to a blade, which can greatly reduce the rotation resistance of the middle weight of the inner kettle body relative to the bottom stirring blade when the motor is started, so that the motor can be burned at the moment of starting. In addition, the The setting further improves the shearing ability of the bottom stirring blade to the silver powder and improves the stirring effect.

It is further provided that the stirring shaft drive mechanism includes a servo motor, the output shaft of the servo motor is provided with a first pulley in linkage, and the outer end of the stirring shaft is provided with a second pulley in linkage, the first pulley and the second pulley The two pulleys are connected through a belt drive. Through this setting, the rotational drive to the stirring shaft is realized.

It is further provided that the lid of the kettle is provided with a support ring mounting hole on the outside of the stirring shaft, and a support ring sleeved outside the stirring shaft is fixedly supported in the support ring mounting hole, and the lower end of the support ring is provided with a stirring ring. The shaft is rotated and attached to the shaft sleeve. The supporting ring is provided with an annular groove relative to the upper inner wall of the shaft sleeve. The space between the annular groove and the stirring shaft is provided with a rotating bearing, graphite filler and Packing gland. Through this setting, the sealing of the stirring shaft at the upper cover is effectively guaranteed.

To sum up, the utility model has the advantages of reasonable structural arrangement, and can effectively prevent the problem of mutual adhesion caused by mutual accumulation of silver powder, and improve the quality of silver powder prepared by chemical reduction.

The utility model will be further introduced below in conjunction with the accompanying drawings of the description and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the specific embodiment of the utility model;

Fig. 2 is the bottom view of the stirring wheel of the specific embodiment of the utility model;

Figure 3 is a three-dimensional view of the cooperation between the bottom stirring body and the stirring shaft in the specific embodiment of the utility model.

Detailed ways

The following specific descriptions of the utility model are carried out through the examples, which are only used to further illustrate the utility model, and cannot be interpreted as limiting the protection scope of the utility model.

The specific embodiment of the utility model as shown in Fig. 1-3, comprises outer still body 1, the inner still body 2 that is located in outer still body, the stirrer that is located in inner still body 2, described outer still In the body, an electric heating rod 5 is provided in the space outside the inner kettle body 2, the agitator includes a stirring shaft 3, and the upper end of the inner kettle body is provided with a sealing lid 4, and the kettle lid 4 A feeding port 43 is arranged on the top, and the upper end of the stirring shaft 3 protrudes from the kettle cover, and a stirring shaft driving mechanism for driving the stirring shaft to rotate is provided in conjunction with it. The stirring shaft driving mechanism described in this embodiment includes a servo motor 31, the output shaft of the servo motor 31 is interlocked with a first pulley 32, the outer end of the stirring shaft 3 is interlocked with a second pulley 33, the first pulley 32 and the second pulley 33 are connected by a belt 34 Transmission connection.

In addition, the bottom of the stirring shaft 3 described in this embodiment is provided with a bottom stirring body 6, and the bottom stirring body 6 is provided with four bottom stirring blades 61 which are symmetrically distributed across each other and tilted upwards. The outer profile of the bottom stirring blade 61 includes a vertical wall 611 at the top and an arc-shaped wall 612 connected to the bottom of the vertical wall. The vertical wall 611 is adjacent to the inner wall of the inner kettle body. An oblique transition wall 613 is arranged obliquely inwardly on the inner profile of the blade 6, and a stirring wheel 7 is arranged in conjunction with the stirring shaft 3. The agitating wheel 7 is located inside the oblique transition wall 613 of the bottom stirring blade, and the stirring The wheel includes a disc-shaped wheel body, and a plurality of arc-shaped wing plates 71 are evenly distributed on the inner circumference of the wheel body. In addition, the arc-shaped wall 612 of the bottom stirring blade 61 described in this embodiment The width is set gradually decreasing from top to bottom.

In order to ensure the tightness of the connecting part between the kettle cover and the stirring shaft, the kettle cover 4 is provided with a support ring mounting hole 41 relative to the outside of the stirring shaft. A support ring 42, the lower end of the support ring is provided with a shaft sleeve 421 that is rotatably fitted to the stirring shaft, and the support ring 42 is provided with an annular groove 422 on the upper inner wall of the shaft sleeve, and the annular groove 422 is compatible with The space between the stirring shafts 3 is sequentially provided with a rotating bearing 423 , a graphite packing 424 and a packing gland 425 from bottom to top.

Claims (4)

1. a kind of reactor that prepares silver powder with agitator, comprises outer kettle body, the inner kettle body that is located in outer kettle body, the agitator that is located in inner still body, described agitator includes stirring shaft, so The upper end of the inner kettle body is provided with a seal and a kettle cover, and the kettle cover is provided with a feeding port. The upper end of the stirring shaft extends out of the kettle cover and is linked with a stirring shaft drive for driving the stirring shaft to rotate. The mechanism is characterized in that: the bottom of the agitating shaft is provided with a bottom agitating body, and the bottom agitating body is provided with four bottom agitating blades which are mutually symmetrically distributed in a cross shape and are tilted up to the upper end, and the bottom agitating blades The outer profile of the bottom includes a vertical wall at the top and an arc-shaped wall connected to the bottom of the vertical wall. The vertical wall and the inner wall of the inner kettle body are adjacent to each other. A slanted transition wall is arranged inside, and a stirring wheel is arranged in conjunction with the agitating shaft. The agitating wheel is located on the inner side of the slanted transition wall of the bottom stirring blade, and the stirring wheel includes a disc-shaped wheel body. A plurality of arc-shaped wing plates are evenly distributed on the inner circumference of the periphery of the wheel body. 2. a kind of reactor for preparing silver powder according to claim 1 with agitator is characterized in that: the width of the arc-shaped wall of described bottom stirring blade is gradually reducing setting from top to bottom. 3. a kind of reactor for preparing silver powder with agitator according to claim 1, is characterized in that: described agitator shaft drive mechanism includes servo motor, and linkage is provided with the first belt pulley on the output shaft of this servo motor , the outer end of the stirring shaft is provided with a second pulley in linkage, and the first pulley and the second pulley are connected through a belt drive. 4. a kind of reaction kettle with stirrer for preparing silver powder according to claim 1, is characterized in that: described still cover is provided with support ring installation hole with respect to the outside of agitator shaft, and is fixedly supported in this support ring installation hole There is a support ring sleeved outside the stirring shaft. The lower end of the support ring is provided with a shaft sleeve that fits in rotation with the stirring shaft. The support ring is provided with an annular groove relative to the upper inner wall of the shaft sleeve. The ring The space between the groove and the stirring shaft is provided with rotating bearings, graphite fillers and packing glands sequentially from bottom to top.