SU914084A1 - Drum self-disintegrating mill armour lining - Google Patents

Description

The invention relates to grinding mills themselves, intended for grinding materials, mainly prone to over-grinding.

For crushing materials, self-grinding mills are used, in which various types of armored fires are commonly used.

Known armored fires of mills, working on a large source material, one of the elements of which are the lifters, intended for lifting to a certain height in a rotating drum, the mills of a certain volume of material. Lifters, for the most part, have a length equal to the length of the drum of a self-grinding mill, and the volume of material lifted by each lifter depends on its height (1).

The closest to the invention to the technical essence is the braking of self-grinding mills with lifting elements, made in the form of rods directed along the radius to the center of the drum,

2

and arranged in rows along the drum of the mill [2].

A disadvantage of the known armored fires is the low efficiency of the process of autogenous grinding of larger classes.

The purpose of the invention is to increase the efficiency of self-grinding by increasing the fracture selectivity and reducing the energy intensity of the destruction of the material. ·

This goal is achieved by the fact that in the armored drum self-grinding drum mills, including lifting elements made in the form of rods directed along the radius to the drum axis and arranged in rows along the drum axis of the mill, the distance between the lifting rods in a row is equal to the size of the crushed piece, the distance between the rows lifting rods is 1.8-2.2, and the height of the rods is 0.6-0.7 the size of the maximum piece of the source material.

This embodiment of the armored vehicle allows to reduce the energy cost of autogenous grinding due to spilling between the lifting

3 914084

rods of finished pieces of material, their less overgrinding, and their faster passage to the discharge end of the mill drum.

Instead of lifting and falling in the same place of the drum, ready-made pieces of material circulate along closed trajectories at the bottom of the rotating drum, during one turn of the drum they manage to make several turns, moving ps helix along the axis of the drum due to backwater entering the drum for crushing mills of the original pieces of material at each turn.

FIG. 1 shows a mill drum, a transverse section; in fig. 2 is a view A of FIG. one.

The cylindrical part of the drum of the mill 1 is made with armored 2 and lifting elements 3 in the form of rods directed along the radius to the axis of the drum and arranged in rows along the axis of the drum of the self-grinding mill.

For free spilling between the rods of finished-sized pieces of material, the distance between the rods increases from the top of the rods to their base, located on the cylindrical part of the armored vehicle 2.

The device works as follows.

The original pieces of material are continuously fed into the rotating drum of the autogenous grinding mill ³⁰ . The size of the original pieces is higher than acceptable in the finished product and they need to be pierced with minimal energy consumption, overgrinding and softening. During the rotation of the mill lifting 35 elements 3, which are in the lower position, capture pieces of material and lift them. Some height. The distance between the lifting elements on their upper part is equal to the required maximum <0

four

the size of the crushed material. Therefore, there are screenings of ready-made pieces of ore, which circulate in zone 4 with a rotation frequency exceeding several times the rotational speed of the mill drum and, under the action of the pressure of the initial ore entering the mill, are accelerated to the unloading zone from the drum along a spiral trajectory.

For effective lifting of pieces of material with dimensions above the allowable height of the rods of the armored vehicle, it should be 0.6-0.7, and the distance between the rows, rods 1.8-2.2 of the size of the maximum piece of the source material.

Such an embodiment of an armored vehicle allows an increase in the efficiency of self-grinding of the material.

Claims (1)

Claim Armored lung drum self-grinding mills, including lifting elements made in the form of rods directed along the radius to the axis of the drum and located. ranged along the drum axis of the mill, characterized in that in order to increase the efficiency of self-grinding by increasing the fracture selectivity and reducing energy intensity, the distance between the lifting rods in the row is equal to the maximum size of the crushed piece, the height of the rods in the rows is 0.6-0.7, and the distance between the rows of rods 1.8-2.2 size of the maximum piece of the source material.