SU1217466A1 - Mill - Google Patents

Description

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The invention relates to grinding machines and can be used for fine grinding of bulk materials.

The purpose of the invention is to increase the efficiency of the fine grinding process.

FIG. 1 shows the proposed mill, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - cylindrical shell element with a groove for fastening the impactor; in fig. 4 - impact element with cut.

The mill contains two or more load-carrying devices 1, located along the periphery, case 2, inside of which there are fixed reflective plates 3. In the case of the mellitsa there are two coaxial disks located in a horizontal plane that can rotate towards each other. Upper d. Sk 4 has one or two cylindrical shells 5, in the grooves of which the impact elements 6 are fixed. The lower disk 7 also contains one or two cylindrical shells 8, in the grooves of which the shock elements 9 are fixed. there is a minimum clearance. The hollow shaft 10 serves to unload the finished product. A fitting 11 is located on the housing for supplying air under the rotors. Inside the impact elements there are separation channels 12, for example, of circular cross section through which the crushed material is carried by air from the periphery to the center of the rotors. The input and output from the separation channels are located on the side opposite to the shock surface of the impact elements, that. protects them from destruction. The fineness of the final product can be adjusted by changing the air flow rate, the rotor speed, and the number of separations

channels in each row of percussion elements.

The mill works as follows.

The source material through the loading devices 1 enters the mill housing 2, where it falls under the rotating impact elements 9 of the lower rotor 7, is cast onto the reflective plates 3 and is ground due to multiple shocks. The crushed material of a certain fineness under the pressure of air entering through fitting 11, or under the action of

The vacuum created by the vacuum system, connected to the hollow shaft 10, is directed to the separation channels of the 12. impact elements. In the separation channels, particles with a mass

above the limit value, under the action of centrifugal force, they are accelerated along the channel wall and ejected back into the grinding zone. Particles with a mass below the limit value

get to the next row of percussion elements, pass all the rows of percussion elements, out of the mill through the hollow shaft as a finished product.

In the proposed mill, the impact surface and the surface on which the grinding material is classified are separated and independent from each other. Besides,

In the proposed mill, by changing the number of channels and their size, it is possible to change the air velocity and have a significant impact on the process of grinding and material separation.

The application of the proposed mill allows to increase the efficiency of the process of fine grinding of bulk materials and the quality of the finished product. When grinding in a mill

alumina grade GLMK reaches the specific surface of the final product of 10,000, and on the outlet of the mill there are no particles larger than 10 microns.

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Claims (1)

MILL OF THE DAY OF GRINDING OF BULK MATERIALS, containing a housing, on the inside of which there are reflective plates, two coaxial disks with shock elements rotating towards each other, fittings for supplying air and loading devices located on the periphery of the housing, characterized in that, in order to increase the efficiency of the fine grinding process, the disks are made with cylindrical shells, and the shock elements are mounted in them and made with separation channels, the input and output of which x disposed on opposite sides of the cylindrical shell from the side opposite the impact surface of impact elements. SU., „1217466 Fig! 1217 ^