RU2228220C2 - Grid of drum mill - Google Patents

Abstract

FIELD: constructional members of apparatuses for milling materials. SUBSTANCE: grid of drum mills is in the form of rods with fastening members. The last are mounted with pitch increasing from periphery to center of grid for protecting lining plates of drum against excess wear caused by accumulation of material, especially in the form of layer on periphery of grid. Rods are mounted with possibility of their bending and vibration at engagement with milling members of drum mill. EFFECT: formation of milling layer without lowering efficiency of mill. 2 dwg

Description

The invention relates to structural elements of devices for grinding materials, in particular to drum (tubular) multi-chamber mills.

Known drum mills with grids made in the form of rods. Moreover, to retain the material that easily passes through the gratings and exposes the lining plates subjected to severe wear, additional partitions are installed (SU 1560315 A, 04.30.1990).

The disadvantage of this design is the inability to pass the material through the partitions, which leads to excessive accumulation of material in the grinding zone and re-grinding.

Known partition for drum mills, made in the form of rods with fasteners (SU 316472 A, 12/14/1971).

The disadvantage of such a lattice is that it passes material too quickly through itself, if it is not clogged, but if it is clogged, then it passes over the entire surface too poorly and too poorly.

The objective of the invention is to prevent too rapid descent of the material and, at the same time, to ensure easy passage of the ground material.

This task is achieved by the fact that in the lattice for drum mills, made in the form of rods with fasteners, the latter are installed with a step increasing from the periphery to the center of the lattice to protect the lining plates of the drum from excessive wear by accumulating material and the formation of its layer on the periphery of the lattice, while the rods are installed with the possibility of their bending and vibration when interacting with the grinding elements of the drum mill.

Figure 1 presents a General view of the lattice, figure 2 - section a - a in figure 1.

The lattice of a drum (tubular) mill 1 is made of rods 2 with fasteners 3 installed with different steps, smaller at the periphery of the lattice and larger in the center of the lattice.

The grill works as follows:

In the process, smaller gaps between the fasteners 3 and the rods 2 near the shell of the drum, i.e. on the periphery of the grating, a certain amount of material is accumulated in the grinding space of the drum mill 1 in front of the grating, forming a grinding layer and protecting the lining plates from excessive wear. The output of the material is provided through the part of the grill, where the installation step of the fasteners is less frequent. Moreover, if this layer becomes very large, the grinding elements rise and hit the rods closer to the central part of the lattice, where the fastening elements are installed less frequently. The rods vibrate elastically bending and break the clogs that have accumulated between the rods 2 and the fasteners 3 in sections towards the periphery. The grate is cleaned, the grinding layer becomes thinner.

The described effect is further enhanced if the fasteners are installed only on the peripheral part of the grill.

Claims (1)

The grill of the drum mill, made in the form of rods with fasteners, characterized in that the fasteners are installed in increments increasing from the periphery to the center of the grill to protect the lining plates of the drum from excessive wear by accumulating material and the formation of its layer on the periphery of the grill, while the rods installed with the possibility of their bending and vibration when interacting with the grinding elements of the drum mill.

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