CN215694480U

CN215694480U - Planetary ball mill and ball milling tank for same

Info

Publication number: CN215694480U
Application number: CN202120736584.4U
Authority: CN
Inventors: 沈将华; 叶旭
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2022-02-01
Anticipated expiration: 2031-04-12

Abstract

The utility model discloses a planetary ball mill and a ball milling tank used for the same, wherein the ball milling tank comprises: an outer cover and a tank body; the outer cover includes a fitting having a vent hole; a bulge part smaller than the inner diameter of the tank body is arranged below the outer cover; the top of the tank body is provided with a sealing ring groove, and the inner cavity of the tank body is provided with an elliptic arc bottom surface. Through this application when mixing with ball-milling raw materials powder, can mix more evenly, and do not have the powder and fill up the condition of gathering at tank bottoms, this application has better effect when especially mixing the big sample raw materials of ball-milling density difference.

Description

Planetary ball mill and ball milling tank for same

Technical Field

The utility model relates to the technical field of ball mills, in particular to a planetary ball mill and a ball milling tank for the planetary ball mill.

Background

The planetary ball mill is a necessary device used in the links of mixing, fine grinding, new product development and small-batch high-tech material production, is widely used in the fields of material preparation, powder metallurgy, geology, mineral products, medicine, chemical industry and the like due to small volume, high and stable working efficiency and good mixing and grinding effects, is equipped in various scientific research units, universities and colleges, enterprise laboratories, and has become a new favorite of laboratory grinders.

The planetary ball mill is named because its operation mode is similar to that of a planet in the solar system, and it follows the movement of the planet rotating while revolving around the fixed star.

When two or more raw material powders are required to be mixed and ball-milled, an orthoplanetary ball mill is often used, although the orthoplanetary ball mill can simultaneously revolve and rotate and can provide a relatively large centripetal force, when the density difference between the several raw material powders is large, even if the orthoplanetary ball mill is operated for a long time, the mixed powder still has obvious phenomena of layering and uneven mixing.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a planetary ball mill and a ball milling tank for the planetary ball mill, and aims to solve the problems of layering and non-uniformity in mixing of the ball milling tank in the prior art.

According to an aspect of an embodiment of the present invention, there is provided a ball milling jar for a planetary ball mill, including: an outer cover and a tank body; the outer cover includes a fitting having a vent hole; a bulge part smaller than the inner diameter of the tank body is arranged below the outer cover; the top of the tank body is provided with a sealing ring groove, and the inner cavity of the tank body is provided with an elliptic arc bottom surface.

Wherein the fitting has an internal thread.

Wherein, the bulge below the outer cover is tightly matched with the tank body.

The tank body is provided with a sealing ring groove, and a sealing ring is arranged in the sealing ring groove.

Wherein, ball-milling jar still includes: a plurality of bolts for connecting the outer lid and the tank.

According to another aspect of an embodiment of the present invention, there is provided a planetary ball mill including: the ball milling tank comprises an outer cover and a tank body; the outer cover includes a fitting having a vent hole; a bulge part smaller than the inner diameter of the tank body is arranged below the outer cover; the top of the tank body is provided with a sealing ring groove, and the inner cavity of the tank body is provided with an elliptic arc bottom surface.

Wherein the fitting has an internal thread.

Wherein, the bulge below the outer cover is tightly matched with the tank body.

According to the ball-milling jar that this application provided can mix more evenly when mixing with ball-milling raw materials powder, and do not have the powder and fill up the condition of gathering at tank bottoms, this application has better effect when especially mixing the big sample raw materials of ball-milling density difference.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:

FIG. 1 is a perspective view of a ball milling jar according to an embodiment of the present invention;

FIG. 2 is a front view of a ball milling jar according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a top view of a can body according to an embodiment of the utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The ball milling tank provided by the embodiment of the utility model is mainly used for a planetary ball mill, and is particularly used for mixing and ball milling various sample powder with large density difference. The bottom of the working area of the planetary ball mill is provided with a main wheel disc called a sun disc, the sun disc is generally provided with four bases with uniformly distributed positions, the bases can realize the autorotation function, and ball milling tanks are placed in the bases. Before the equipment works, small balls and sample materials which are made of proper materials are put into a ball milling tank. When the device works, the sun disc rotates, the ball milling tank above the sun disc can revolve around the main shaft at a high speed along with the sun disc, and meanwhile, the grinding tank can rotate around the shaft in the grinding tank at a high speed in the opposite direction. The small balls are directly contacted with sample materials in the tank body, and high-frequency impact, strong extrusion and friction are carried out under the combined action of two motion modes, so that the samples are fully crushed, ground and mixed.

Referring to fig. 1 to 4, a ball milling jar according to an embodiment of the present invention includes: a can 20 and an outer lid 10 connected to the can. The outer cover 10 is provided with two joints 11, the joints 11 are provided with internal threads, the centers of the joints 11 are provided with vent holes 12, the interior of the tank body can be connected with the outside air through the vent holes 12, and the joints 11 are used for being connected with a female head or a male head of a self-locking quick pneumatic valve joint of an air compressor. Female head just can keep unblocked when inserting public head because of the auto-lock normal close, keeps jar internal portion gas tightness through the female head of normal close, can carry out jar internal portion evacuation or let in the protection gas through the public head of grafting again simultaneously, and public head can change in a flexible way in addition for the different specification pipelines of the various models of adaptation.

In the present embodiment, the tank 20 has an inner cavity 21, the sidewall of the inner cavity 21 is a vertical cylinder, and the bottom 22 of the inner cavity has an elliptic arc bottom surface. The circular arc bottom surface is adopted in the application because, the circular arc bottom is directly adopted, and the circular arc bottom and the upper straight cylinder have obvious boundary lines, so that stress concentration can be caused, and the powder mixing ball-milling process can be influenced. The utility model provides a jar body inner chamber adopts the oval arc bottom surface, form bottom radian through half ellipse, and tangent with the straight section of thick bamboo of cylinder of top, through rough calculation, the bottom bobble can be changeed to the circular arc edge to about 217r/min of rotational speed, the increase of rotational speed, centrifugal force increases, the granule is because of centrifugal action to circumferential motion, simultaneously because the bottom radian moves at vertical formation gradient, when the rotational speed reduces, centrifugal force reduces, because the action of gravity, the granule has the tendency of falling back again, rotational speed through setting for planetary ball mill, operating time, interval time and positive and negative rotation operation etc. can realize better more even mixture.

The lower portion of the outer cap 10 has a protrusion 13 slightly smaller than the inner cavity 21 of the can 20, and when the outer cap 10 is fastened to the can 20, the protrusion 13 can enter the inner cavity 21 and tightly fit with the inner cavity 21. For preventing particles from splashing, contaminating the cover plate and the seal ring, and preventing particles from splashing to the seal groove 8.

The top of the tank body 20 is provided with a circumferential circular sealing ring groove 21, a sealing ring is arranged in the sealing ring groove 21, the depth of the sealing ring groove 21 is smaller than the linear diameter of an O-shaped sealing ring, and when the outer cover 10 is connected with the tank body 20, the rubber sealing ring 21 is extruded and deformed, so that a good sealing effect can be achieved.

In the embodiment of the present application, the outer cover 10 has a plurality of bolt holes 15 uniformly distributed in the circumferential direction, and the can 20 has a corresponding plurality of bolt holes 25, so that the outer cover 10 and the can 20 can be coupled by a plurality of bolts. In practical application, the bolt can adopt a full-tooth cylindrical head high-strength inner hexagon bolt of M8 x 20. It should be noted that the tank shown in fig. 4 shows five bolt holes, but the present application is not limited thereto, and other numbers of bolt holes and bolts may be used for connection.

When the ball milling tank is used, a male head is inserted to release pressure, then the bolt is unscrewed, the bolt gasket is taken down, the outer cover is taken down, and a proper amount of sample materials and small balls are filled in the tank body. And then, placing a sealing ring in the sealing groove, installing an outer cover, a bolt gasket and a bolt, screwing the bolt, and inserting a male head to perform vacuumizing or protective gas filling operation if vacuumizing or protective gas is required. And then taking down the male head, installing the ball milling tank on a planetary ball mill, setting the rotating speed, the working time, the interval time and the like of the ball mill, carrying out ball milling operation, and after the ball milling is finished, taking down the ball milling tank, and then carrying out disassembly operations such as inserting the male head, releasing the pressure and the like.

Note that the inner circular arc line of the left half is provided in fig. 2, and the ball milling jar shown in fig. 1 to 3 is shown in a state where the jar body and the outer lid are separated.

Through the above technical scheme of this application, have following technological effect:

firstly, compared with the existing round and straight barrel flat-bottom ball-milling tank, the utility model can obtain more uniform mixture when mixing a plurality of sample raw materials with large ball-milling density difference. Through oval bottom surface arc, increase rotational speed, centrifugal force can make the granule leave ball-milling tank bottom, through calculating, adopts dry-type ball-milling method, the coefficient of dynamic friction of steel (about 0.4), and the bobble of oval bottom can turn to arc top edge when the rotational speed is about 217r/min, and speed reduces, and granule powder has the trend toward the bottom gathering again to make the mixture more even. Meanwhile, the elliptic bottom circular arc of the ball milling tank provided by the utility model eliminates the problems of insufficient ball milling and sample powder aggregation caused by dead angles which cannot be milled in the tank body.

Secondly, compared with a common round straight cylinder ball milling tank with a chamfer, the problem of accumulation and aggregation of sample powder is eliminated, but the problem of layering and non-uniformity when several sample powders with large density difference are mixed still exists, and the problem is solved by the utility model.

Finally, compared with the replacement of a more expensive all-dimensional ball mill or the change of the structure of the ball mill, the ball mill provided by the utility model adopts a form of replacing a ball milling tank, so that the cost is lower, the operation is easier, the transportability is high, and the safety is high.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A ball-milling jar for a planetary ball mill, comprising: an outer cover and a tank body;

the outer cover includes a fitting having a vent hole; a bulge part smaller than the inner diameter of the tank body is arranged below the outer cover;

the top of the tank body is provided with a sealing ring groove, and the inner cavity of the tank body is provided with an elliptic arc bottom surface.

2. The ball mill pot of claim 1, wherein the adapter has internal threads.

3. The ball milling jar of claim 1 wherein the lip below the outer lid mates with the jar body.

4. The ball milling bowl of claim 1, wherein the bowl has a seal groove provided with a seal.

5. The ball mill pot of claim 1, further comprising: a plurality of bolts for connecting the outer lid and the tank.

6. A planetary ball mill, characterized by comprising: the ball milling tank comprises an outer cover and a tank body;

7. Planetary ball mill according to claim 6, characterized in that the joints have an internal thread.

8. Planetary ball mill according to claim 6, characterized in that the bulges under the outer cover are tightly fitted with the pot.

9. Planetary ball mill according to claim 6, characterized in that the pot has a sealing ring groove provided with a sealing ring.

10. The planetary ball mill according to claim 6, characterized in that said ball milling pots further comprise: a plurality of bolts for connecting the outer lid and the tank.