SU1565515A1 - Ball-tube mill - Google Patents

Abstract

The invention relates to equipment for the fine grinding of materials and can be used in the building materials industry, in the mining, energy and chemical industries. The mill consists of a cylindrical drum with hollow trunnions loaded with grinding bodies, an output grille, an inclined inter-chamber partition, a lining with protrusions parallel to the partition, loading and unloading devices. 2 hp f-ly, 1 ill.

Description

The invention relates to equipment for the fine grinding of materials, in particular, spherical drum mills with inclined inter-chamber partitions, and can be used in the building materials industry in the production of cement, as well as in mining in the processing of coal, chemical in the production of fertilizers.

Known spherical drum mills consisting of a cylindrical drum with hollow trunnions, lining, exit grating, inclined inter-chamber partitions, loading and unloading devices.

A disadvantage of the known mills is the incomplete use of the volume of chambers at their maximum length, and the length of the mill chambers is not fully taking advantage of the inclined inter-chamber partition, which reduces the angle of lift of the grinding bodies in the first chamber of the mill, leads to increased energy consumption of grinding bodies, in general reduces the effectiveness of the grinding process in mills with inclined inter-chamber partitions.

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Closest to the proposed invention is a ball drum mill consisting of a cylindrical drum with hollow trunnions loaded with grinding bodies, an output grating, an inclined inter-chamber partition, lining with protrusions parallel to the partition, loading and unloading devices.

A disadvantage of the known mill is the excess energy of the grinding bodies along the entire length of the drum due to the large number of protrusions on the lining, which leads to waste of energy, increased wear of the grinding bodies, overgrinding of the material

The purpose of the invention is to reduce power consumption, specific energy consumption.

This goal is achieved by the fact that in a well-known mill consisting of a cylindrical drum with hollow trunnions loaded with grinding bodies, an output grating inclined between a chamber partition, a lining with protrusions parallel to the reloading of the loading and unloading devices, the projections on the lining are located half the diameter of the drum in the long part of each chamber of the mill and 180 ° offset in each of the adjacent chambers, the short part of the first chamber is 0.2-0.35 of the total length of the drum of the mill, the level of grinding bodies in the first In the short part of the chamber, the chamber can be 0.30-0.33 of the inner diameter of the mill, and the step between the protrusions in the first chamber can be (3-6) c1 and the second increases along the longitudinal axis of the drum from 6dUJ to 12du) i, where ys is the diameter of the weighted average ball.

Fig, 1 shows a ball drum mill, a longitudinal section; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1.

The ball mill consists of a cylindrical drum 1, which is divided into two chambers by an inclined inter-chamber partition 2

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the first chamber 3 coarse grinding and the second chamber 4 fine grinding. The inner surface of the drum 1 of the mill is lined with smooth armored plates 5, between which are the projections 6. The tabs 6 are equipped with half of the drum in each of the chambers of the mill, corresponding to its long part.

The length of the chamber 3 is located at the top, the protrusions 6 are in the upper part of the drum (section A-A). The opposite section of the chamber 3 has a smooth lining along the entire length of the short part of the chamber located in the mill position at the bottom of the mill, and only the upper part of the drum, separated by its horizontal axis (section A-A), is equipped with lifters. The length of the chamber 4 is located below (figure 1). The protrusions 6 in it are also located at the bottom, occupying the lower part of the drum of the mill, the top is lined with smooth plates 5 (section BB). The areas with protrusions 6 in adjacent chambers 3 and 4 of the mill are offset relative to each other by 180. The drum 1 of the mill is equipped with an output grating 7.

The grinding bodies 8 in chamber 3 occupy a maximum level determined by the height his which is 0.30-0.33 of the inner diameter of the mill. In chamber 4, the grinding bodies 8 have a minimum level determined by the height h I (h 1 Lg).

The mill works as follows.

When the drum 1 is rotated, the length of both chambers in one revolution changes from a minimum to a maximum value. For example, chamber 3 has a minimum length of 11} and after half a turn of the mill drum, its length increases by L1. The load level varies from maximum to minimum.

The proposed mill can reduce power consumption and specific energy consumption.

At 1 3 5 6 Z

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figure 1

FIG. 2

Editor G. Gerber

Tehred M. Khodanich Proofreader O. Kravtsova

 Order 1180 Circulation 508 Subscription

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

6-6

Fig.Z

Claims (1)

1. BALL DRUM MILL, consisting of a cylindrical drum with hollow pegs loaded with grinding bodies, an output grating, inclined inter-chamber partition, lining with protrusions parallel to the partition, loading and unloading devices, about