Mill

Solid material comminution or disintegration – Apparatus – Including means applying fluid to material

Patent

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Details

241 48, 241 791, 241275, 2412851, B02C 1900, B02C 2308

Patent

active

059674326

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to a non-ball crushing mill, and particularly to a mill in which the material are crushed by the collision and friction between the material during the high speed circulating movement within the mill, without the necessitate of making use of steel balls. This kind of mill has a wide application in various technical fields such as mineral separation, metallurgy, chemistry, building material industry, ceramic industry, and power plant.


DESCRIPTION OF THE PRIOR ART

The existing ball mill makes use of steel balls to crush the material like mineral. A large amount of steel balls will be consumed during this operation. In addition, the hardness of steel balls can only be the level of 7-8, while the hardness of some kind of mineral reaches the level of 8-9, even 10. Therefore, it is either difficult to crush the material or to reach high efficiency by means of the conventional ball mill. On the other hand, the weight of rotating parts and steel balls takes about 95% by weight of the total weight of the rotating portion of a conventional ball mill. This proportion is much higher than that of material to be crushed, therefore the energy consumption needed for obtaining crushed material of unit weight is rather high. The steel balls used in this kind of mill will be worn out during the crushing operation, which will reduce the purity of some kind of products or cause environment contamination. In addition, the ball mill can not be used as a floatation unit simultaneously.


BRIEF DESCRIPTION OF THE INVENTION

One object of this invention is to provide a non-ball mill which makes the material to circulate at high speed within the mill so as to crush the material by the collision and friction produced between the material as such. This kind of mill has a very few steel consumption and low rate of parts wear-out. The overall weight, particularly the weight of rotating parts of the device, is reduced considerably, therefore the energy consumption can be reduced and the efficiency improved remarkably.
Another object of this invention is to provide a mill with low noise, low vibration and no environment contamination.
A still another object of this invention is to provide a mill capable of performing the separating and crushing operation simultaneously.
The mill for realizing the above mentioned objects includes base, motor, milling chamber, inlet funnel, outlet port, and wherein; and a lower chamber, a central channel being formed at the central portion of the return funnel and a return channel being formed between outer peripheral edge of the return funnel and the inner surface of the milling chamber, so as to circulate the material back and forth to the upper and lower chamber with high speed, causing the material to be crushed by collision and friction produced during high speed movement; milling chamber being provided in said lower chamber, so as to make the material to rotate at high speed; chamber, and a separating rotor being provided within said separating chamber and fixed on the shaft; top of said separating chamber.
In order to make the material to circulate more effectively at high speed through the upper and lower chamber, the body forming the milling chamber is divided into an upper body and a lower body, the upper chamber and lower chamber being formed respectively within the upper and lower body, a top cover being provided at the top of the upper body. Both of the upper and lower body have the shape of pyramid with the base ends of the two pyramids jointed together, so that the whole milling chamber looks like a Rugby with a larger middle portion and two small end portions.
Both the upper and lower body preferably have the shape of hex-pyramid. In other words, the horizontal section view perpendicular to the axis of the pyramid is a regular hexagon.
Each vertex angle of the pyramid forming the upper and lower body is preferably 120.degree..
In addition, a plurality of barricades are protruded vertically from each edge of the pyramidal upper and lower

REFERENCES:
patent: 3155326 (1964-11-01), Rhodes
patent: 4133487 (1979-01-01), Lanier
patent: 4436138 (1984-03-01), Kondo
patent: 4756484 (1988-07-01), Bechler et al.
patent: 5277370 (1994-01-01), Schatz
patent: 5330110 (1994-07-01), Williams
patent: 5690284 (1997-11-01), Murray
patent: 5706879 (1998-01-01), Renner et al.

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