Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Patent
1985-12-04
1988-01-26
Eley, Timothy V.
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
241188A, B02C 1322
Patent
active
047212594
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to apparatus for breaking up, mixing and agitating various materials, and more particularly it relates to disintegrators.
PRIOR ART
At present, there are known disintegrators comprising a housing with a charging pipe and a discharge pipe, and rotors mounted inside the housing for rotation in opposite directions, having discs with beaters secured thereon and defining rows extending one after another in the radial direction (see I. A. Hint, "Fundamentals of Production of Silicon-Calcium Articles" published in 1962, "GOSSTROIIZDAT" Publishers, Moscow-Leningrad, pp. 123-126).
In this disintegrator the processed material is fed into the center of the rotating rows of beaters via the charging pipe. Upon contact with the beaters of the row closest to the centre of rotation, particles of the material are imparted the speed corresponding to this row and projected by the centrifugal forces from the path of this row toward the successive row of beaters, where they are broken up and propelled toward the next successive row of beaters, and so on, until they are ejected by the last-in-succession row of beaters. Thus, the entire volume of the material in the working zone of the rotors is put through the working cycle, including that part of the material which has been already disintegrated to the required fineness. Dwelling in the working zone in the suspended state, the finer part of the disintegrated final product is more susceptible to the motion of swirling streams of the gaseous or air medium in the rotors than to the action of the beaters, so that larger particles propelled through the suspended finer material lose some of their speed, and the impact of the beaters of the successive row thereupon becomes less effective. Furthermore, the processing of the material already disintegrated to the required fineness consumes some of the energy input, as its fine particles are engaged by beaters of successive rows.
There are also known disintegrators of the "attrition disintegrator" type, comprising a disc supporting thereon beaters of the first and second disintegration zones, and stationary beaters interposed between the rows of beaters of the second zone and secured to the housing of the attrition disintegrator, with the final product being exhausted from the second zone by suction in a stream of air, while particles not yet disintegrated to the required fineness of the final product are propelled by the centrifugal forces into the milling zone (cf. advertising pamphlet of Alfred Herbert Ltd., Great Britain).
This disintegrator is of a complicated structure, and its operation is associated with a high energy input on account of the final product being drawn by the air from the peripheral rows of beaters toward the centre, increasing the density of the medium in which the beaters are rotated, and also stepping up the energy input due to collisions of particles of the already disintegrated product with the beaters.
There is further known a disintegrator which is considered the closest prior art of the present invention, comprising a housing with a charging pipe and a discharge pipe. Mounted inside the housing for rotation in opposite directions are rotors with carrier members having beaters secured thereon by their end faces, defining rows extending one after another in the radial direction (cf. SU Inventor's Certificate No. 938,236; Int. Cl..sup.3 BO2C 13/22, published in 1982).
In this disintegrator the processed material passes through all the rows of beaters, and upon leaving the peripheral row enters the zone with a transverse stream of air, where finer particles of the final product are separated and carried toward the transport disc for the final product, belonging to the conveying arrangement. Coarser particles are returned into the charging pipe by the conveying arrangement for repeated milling.
Among shortcomings of this disintegrator are its complicated structure, an additional input of energy into the arrangements for conveying the coarse and fine products, inadequate
REFERENCES:
patent: 2039264 (1936-04-01), Seckendorff
patent: 3894695 (1975-07-01), Benedikter
patent: 4146185 (1979-03-01), Schober
patent: 4659025 (1987-04-01), Tjumanok et al.
I. A. Hint, "Fundamentals of Production of Silicon Calcium Articles", published in 1962, "Gosstroiizdat" publishers, Moscow-Leningrad, pp. 123-126.
Advertising Pamphlet of Alfred Herbert Ltd., Great Britain.
Purga Aare P.
Reemet Olev G.
Shagarova Bella U.
Tikhonov Oleg N.
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