SU1636046A1 - Design of drum mills - Google Patents

Abstract

The invention relates to comminuted equipment, in particular, to the construction of drum mills for wet self-grinding of viscous, plastic materials, and can be used in the construction industry, chemical, mining and processing and other industries. The aim of the invention is to increase productivity by preventing the clumping of large fractions of plastic material. To do this, in the unloading device including a grid 1 mounted inside the cylindrical body 6, elevator blades 3 with windows 4, 5 and a discharge cone 2, windows 4. 5 are made along the entire width of the elevator blades 3, the distance between the windows 4, 5 and between the window 4 and a cylindrical body 6 on each elevator blade are 0.12-0.2 of the diameter D of the mill, and the height of the windows is 4-10 times greater than the width of the slots 7 of the discharge grid 1. 1 silt (L O 00 o Jb o

Description

The invention relates to grinding equipment, namely, the construction of drum mills for wet self-grinding of viscous, ductile materials, and can be used in the construction industry, chemical, mining and other industrial sectors.

The purpose of the invention is to increase productivity by preventing the clumping of large fractions of plastic material.

The drawing shows the discharge device of a wet self-grinding mill, a cross section.

The discharge device includes a discharge grid 1, a discharge body 2 and elevator blades 3 with windows 4 and 5, made across the entire width of the elevator blades 3. At the same time, the distance between the windows 4 and 5 and between the window 4 and the cylindrical body 6 of the mill on each elevator blade 3 is 0.12-0.2 of the diameter D of the mill, and the height of the windows 4 and 5 is 4-10 times the width of the slots 7 of the discharge grid 1.

The discharge device operates as follows.

The sludge entering the discharging device through the grate 1 rises upwards with elevator blades. At the same time, larger particles of sludge under the action of centrifugal forces are thrown to the peripheral part of the elevator blades 3. When a certain height is reached, the first one begins to drain along the elevator blade 3 sludge, consisting mainly of small particles. Moreover, in the process of moving the finely dispersed part of the sludge along the blade 3, most of it slips through the window 4 to the discharge cone 2, and the smaller part through the window 4 merges onto the lower elevator blade 3. With the further rise through the window 4 large sludge particles also begin to merge after hitting the slurry with a predominant content of fine particles, it slides along the lower elevator blade 3 to the discharge cone 2 without the formation of lumps of a large fraction of plastic material.

When using wet self-grinding mills of large diameter (more than 7 m), as well as in the presence of a large number of large particles prone to sticking and clumping on the elevator blades x 3 between the windows 4 and the discharge cone 2, the windows 5 are made.

The process of further unloading sludge through the windows 5, providing separation

sludge into fine and coarse fractions, similar to the process of unloading sludge through the windows 4.

Windows 4 and 5, made across the entire width of the elevator blades 3. eliminate the presence of protrusions on the discharge grid 1 and the end face of the mill, which are places of intensive adhesion of plastic material in the discharge device. The distance between the windows 4 and 5, as well as between the window 4 and the cylindrical body 6, is 0.12-0.2 of the diameter D of the mill, due to the fact that

5 when the distance is less than 0.120, the productivity of the unloading device drops sharply due to premature overflow of sludge to the lower elevator blades 3, with distances of large 0.20, large lumps of large particles of sludge are formed on the elevator vanes that get stuck in the windows 4 and 5 and at the exits from the elevator blades 3. Therefore, the distance between windows 4 and 5 and between window 4 and

5 cylindrical housing 6 in the range of 0.120 - 0.2O is chosen depending on the plasticity of the material: the greater the plasticity, the closer this distance should be to the value of 0.12D, since this

In the event of a large lump of large particles of sludge are formed more quickly, they need to be discharged more quickly to the lower elevator blade 3 into the stream of finely dispersed (liquid) sludge.

five

The height of the windows 4 and 5, 4-10 times the width of the slits 7 discharge grid 1, due to the fact that when the height of the windows 4 and 5 is less than

0 values, they are clogged with maximum particle size of the material, the largest size of which is not less than 4 times the width of the slots 7 of the discharge grid, with the same height of windows

5 4 and 5 more than a large value, the discharge device performance drops sharply due to insufficient sludge lifting height due to premature overflow of sludge to the lower elevator blades 3.

Tests of the proposed design of an unloading device in a wet self-grinding mill of clay showed that by preventing the clumping of large

Five fractions of the plastic material and their pasting of the elevator blades of the unloading device increase the productivity of the mill by a factor of two with a higher reliability and stability en work.

Claims (1)

Discharge device of a wet autogenous grinding mill mainly for processing viscous plastic materials, including a grid mounted inside a cylindrical body, elevator blades with windows and a discharge cone, characterized in that in order to increase productivity by preventing the clumping of large fractions of plastic material, the windows are made the entire width of the elevator blades, the distance between the windows and between the window and the cylindrical body on each elevator blade ti was dissolved 0.2 0,12- diameter cylindrical body, with the height of windows in 4-10 times the width of the discharge slots of the lattice.