SU927301A1 - Self-disintegrating mill - Google Patents

Description

one

The invention relates to devices for grinding and can be used for grinding materials in the construction, cement, mining, chemical, metallurgical and other industries.

A drum mill is known for self-grinding, containing, and a drum with trunnions and a drive 1.

The lack of a known construction of the mill is associated with significant specific energy consumption and high (more than 50%) material yield with a particle size exceeding the nominal one.

The closest technical solution to this invention is a self-grinding mill, containing a drum with end caps and hollow loading and unloading trunnions, lifting shelves, and an actuator 2.

However, solid lifting shelves installed along the drum move to the upper position all the material that is exciting for them, regardless of the degree of grinding, which increases energy consumption. In addition to this, as the degree of comminution of the material increases as it moves along the mill, the efficiency of the process is reduced due to a decrease in the fraction of impact destruction.

The aim of the invention is to reduce power consumption and increase the productivity of self-grinding drum mills.

In order to achieve the goal in a self-grinding mill containing a drum with face covers, hollow loading and unloading trunnions and lifting shelves, the drive is mounted in the lower part of the drum mounted on a plate passing through the trunks of the supporting structures with an increase in the side of the discharge trunnion, and The lifting flanges are made with longitudinal windows with a width that decreases in the direction of the unloading trunnion.

20

FIG. 1 shows a mill, vertical section; in fig. 2 - a section in the plan.

Claims (2)

The mill includes a horizontally located rotating drum 1 with end caps 2 and trunnions 3, in which loading 4 and unloading 5 nozzles, lifting lattice shelves 6, profiled impact plate 7, oriented along the normal to the trajectory of the feed particles, supporting structures, fastened with loading 4 and unloading 5 branch pipes. The mill works as follows. The grinded material entering through the nozzle 4 enters the cavity of the drum 1 and, being gripped by the lifting shelves b, moves to the upper position. The width of the windows of the lifting shelves 6 is selected in accordance with the experimental data on the granulometric composition of the material along the drum 1 variable, decreasing from a value of 0.8-0.9 to the average size of the original piece entering the drum 1 to a value of 1.1 -1.2 size the largest piece in the final crushed product. Such an embodiment of the lifting shelves 6 makes it possible to completely or partially exclude periodic transportation of fine fractions to the upper position, which worsen the degree of grinding. Pieces that are larger than the width of the windows of the lifting shelves 6 in this section of the drum 1 are moved to the upper position and dumped into the crushing zone. Precipitations provide a collision between particles of approximately the same size class. The presence of a profiled impact plate 7 installed above the level of the crushed material eliminates the softening of the impact, which usually occurs when lumps of sludge-like mass fall on the bottom of the drum 1, filled with the same material, provides the necessary impact rigidity and increases the efficiency of destruction of the particles: ia final grinding stages The dimensions of the impact plate 7 are chosen so that in the loading and unloading parts of the drum 1 there is a gap between the lifting shelf 6 and the impact plate 7, which is equal to the 3rd diameter maximum frame piece section in the drum 1. Using this Autogenous provides over known reduction of energy consumption by eliminating periodic transporting fine fractions izmel aemogo material; an increase in the degree of comminution of the material due to the homogeneous lumpiness of the material comminuted in each section of the drum; increase mill productivity; reducing drum wear and reducing repair costs through the use of a replaceable impact plate. Claims of the invention A self-grinding mill comprising a drum with end caps, hollow unloading and loading trunnions and lifting shelves, is driven in such a way that, in order to reduce energy costs and increase productivity, the lower part of the drum is mounted fixed on supporting structures that pass through the axles a plate with an increasing width of the unloading trunnion, and the lifting flanges are made with longitudinal windows with a width that decreases in the direction of the unloading trunnion. Sources of information taken into account during the examination 1. USSR author's certificate No. 208873, cl. B 02 C 17/22, 1966. 2. USSR author's certificate number 529841, cl. B 02 C 17/18, 1973 (prototype).