RU77180U1 - DEVICE FOR GRINDING, CLASSIFICATION AND WRAPPING POWDER MATERIALS - Google Patents

Abstract

The utility model relates to the hardware design of chemical technology, in particular, to devices for carrying out processes: grinding, classification and pelletizing of powdered bulk materials. A device for grinding, classification and pelletizing of powdered materials operates in a batch mode. It contains a sealed cylindrical chamber, inside of which there is a vertical shaft, on which 2 V-shaped working elements (rectangular blades) are fixed with a 90 ° angle between them, the ends of which are directed in opposite directions, characterized in that the ends of the lower blade are bent parallel to the bottom with a gap of 0.05-2 mm, and on the side surfaces of the blades along the rotation of the shaft there are bevels 15-45 °, located bevelled to each other. In this case, their sharp edges are blunted (rounded) with a radius equal to (or more) the radius of the particle size to be obtained. Loading of the processed material is carried out through the hatch in the upper part of the body, and the finished product is unloaded through the hinged bottom.

The proposed technical solution will allow to obtain crushed bulk powder materials of a given size and shape.

Description

The utility model relates to hardware design in chemical technology, in particular, to devices for grinding, classification and rolling of bulk powder materials, for example, copolymers to specified sizes and shapes.

Known devices for grinding materials (for example, AS No. 1215739 USSR, IPC V02C 13/14), consisting of a cylindrical body, inside which a perforated working chamber is placed, in which a vertical shaft with working elements in the form of plates with straight bent plates is placed corner ends.

The disadvantage of these devices is the frequent clogging of the perforated chamber upon receipt of the finely dispersed material, and, in addition, it is impossible to roll on these devices due to the chaotic unorganized movement of the crushed particles of material in the working chamber.

The closest to the achieved result is a mill for dry fine grinding (a.s. No. 1607947 USSR, MPK V02S 19/00, 13/18), containing a cylindrical grinding chamber, a separator and a working body in the form of a disk with blades located at an angle of 60 ° to the bottom of the chamber, the ends of which are bent at an angle of 45-60 ° in the direction opposite to the rotation of the working body. Material through the feed chute enters the grinding chamber, where it is crushed due to numerous high-frequency particle collisions occurring in a closed mountainous system of turbulent swirling flows moving in the direction of rotation of the working body. Shredded

particles of material from the grinding chamber fall into the separator and are evacuated from the mill.

The disadvantage of this device (mill) is that the evacuation of the crushed fraction from the grinding chamber occurs by its separation under the action of centrifugal forces, which depend on the mass of particles and the separation factor. This leads to the entrainment of a large number of non-rolled particles, resulting in substandard material in terms of “particle shape”.

The objective of the proposed technical solution is to obtain shredded conditioning material in terms of "particle size" and "particle shape".

This goal is achieved by the fact that the crushed material as a result of repeated passage through the working body in the form of rotating blades, is crushed, rolled up and classified.

Figure 1 shows a General view of the device for grinding and rolling powder materials.

Figure 2 shows the layout of the working elements (blades and jumpers) on a vertical shaft.

Figure 3 shows the chamfer on the lower blade.

Figure 4 shows the chamfer on the upper blade.

A device for grinding, classification and rolling of powdered materials contains a sealed cylindrical chamber 1, in which a vertical shaft 2 is placed (sealed with a chevron joint), with diametrically mounted on it with an angle of 90 between the upper (3) and the lower (see Fig. 2) 4 V-shaped working elements (blades of rectangular section) having angles at the apex of 90-120 °. The ends of the blades are directed in opposite directions, while at the bottom of the blade the ends are bent parallel to the bottom 5 with a gap of 0.05 - 2 mm. The ends of the upper lobe

connected by a jumper 6, and a jumper 7 connects the ends of the lower blade in places of their bend.

For loading the crushed material on the chamber 1 there is a loading hatch 8, and for unloading there is a hinged bottom 5 pivotally mounted on the chamber 1. The connection of the bottom with the chamber is sealed using gaskets 9 and a locking device 10.

A device for grinding, classification and pelletizing of powdered materials operates in a periodic mode as follows.

The source material is loaded into the chamber 1 through the hatch 8 in the amount of 1/3 of its volume. Then the drive of the shaft 2 is turned on, the crushed material is subjected to intensive vertical circulation in the direction indicated by the arrows in FIG. 1, repeatedly passing through the working area of the rotating blades, where it is crushed and rolled around. The processing time for obtaining a conditioned material is 3-15 minutes at a linear speed of rotating working elements of 70-90 m / s. After completion of the grinding and pelletizing process, the conditioned material is discharged from the chamber 1 through the hinged bottom 5 into a technological container.

The creation of vertical circulation is as follows. The bent ends of the blade 4, rotating in the bottom part, by means of a bevel 15-45 ° (see figure 3) raise the lower layers of the material, which are centrifugally reclined to the periphery by a reflecting device 11 (see figure 1) in the form of a truncated cone with an apex angle of 60-90 °, directed downward. Reflecting from it, the particles move up the chamber, where they are captured by the blade 3, and since the chamfer is directed downward on it (see Fig. 4), it directs the flow to the lower blade, thereby closing the circulation.

When the material passes through the working area, it is crushed, classified and rolled. Grinding material

for example, copolymer agglomerates, occurs upon collision with the pointed ends of rotating blades, and multiple passage of agglomerates through the working zone ensures their complete grinding to a certain size. The sizes of the agglomerates depend and are determined by the radius - R of the edge of the blades (see figure 3 and figure 4). The resulting size of the agglomerates will be equal to or less than the radius of the edge of the blades due to the fact that agglomerates with a size larger than the radius of the edge of the blades break, and agglomerates with a size less than the radius of the edge will be broken from it, but not broken, as a result, they are classified by size. Simultaneously with the grinding of agglomerates, their rolling takes place. The rounding mechanism consists in the rounding of sharp edges resulting from breaking agglomerates. Pelletizing takes place on the chamfers of the blades (see Fig. 3 and Fig. 4) when hit, twisting and smoothing occurs due to friction of the crushed agglomerates on the surface of the blade.

To exclude stagnant zones and to intensify the process of grinding, classification and pelletizing, the blades are connected by bridges of rectangular cross section with bevels with roundings similar to those of the blades that they connect.

Thus, the proposed technical solution will allow to obtain crushed bulk powder materials of a given size and shape.

Claims (3)

1. A device for grinding, classification and rolling of powdered materials, containing a sealed cylindrical chamber, inside which there is a vertical shaft, on which are fixed two working elements of a V-shape (rectangular blades) with an angle of 90 ° between them, the ends of which are opposite parties, characterized in that the ends of the lower blade are bent parallel to the bottom with a gap of 0.05-2 mm, and on the side surfaces of the blades along the shaft rotation there are bevels 15-45 ° located bevel to each other, etc. This their sharp edges are dulled (rounded) of radius equal to (or more) radially particle size to be received. 2. The device according to claim 1, characterized in that the V-shaped blades are connected by jumpers (rectangular section) with chamfers and roundings similar to those on the blades. 3. The device according to claim 1, characterized in that in the lower part of the camera there is a reflecting device in the form of a truncated cone, with an angle at the apex of 60-90 °, directed downward.