Solid material comminution or disintegration – Processes – Miscellaneous
Patent
1997-03-05
1998-06-30
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
Miscellaneous
241 33, 24118635, 2412853, B02C 2500
Patent
active
057721300
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and mill for crushing rubble.
For purposes of this application and the invention disclosed, the term "rubble" is used to refer to building demolition materials and similar materials which, during the crushing thereof, create a dust formation.
2. Related Art
A method and mill of the considered type are employed, for example, in plants for treating building demolition rubble for obtaining re-usable aggregate. A plant of this type is disclosed, for example, in IT-A-1,228,705 assigned to the applicant.
The crushing and discharging method of the known mills is illustrated below with reference to the schematic representation of FIG. 1.
The first stage of the plant of the type disclosed in IT-A-1,228,705 is formed by a crushing and discharging station, whereby said crushing and discharging station is illustrated in FIG. 1 and designated as a whole by A. Said crushing and discharging station A is formed by a mill 1, generally a hammer mill provided with hammers driven by a motor, and an underlying discharging device or box 2 for discharging the crushed material, for example on a conveyor belt 3. The discharging device 2 is a separated, distinct device which is removably associated to the mill 1.
In more detail, the mill 1 has at the top thereof a charging opening 4 into which the rubble to be crushed is introduced by means of a reciprocating feeder 5 or other suitable feeder. Inside the mill body 7 is supported a rotor 8 provided with the not shown crushing hammers, and that can be driven by a not shown electric or diesel motor, in the direction indicated by the arrow F. The lower portion of the mill body 7 forms a hopper 9 which is closed below by a bottom 10 and is open at one of the lateral sides thereof, in the shown example at the front side 12. The mill hopper 9 is housed in said discharging device or box 2. The latter is formed by a vibrating box which is made up of two sidewalls 13 and 14 and a back wall 15 fixed to the mill body 7 and a bottom 10 which is connected to a not shown vibrating means supported by springs on a basement in a not shown manner. The front side 12 of said discharging box 2 is open to allow the crushed material to be discharged in the direction of the arrow F.
The known crushing and discharging method comprises the following steps: hopper to form a material layer having a lower height
Sheet steel deflectors indicated at 18 guide the introduced material towards the central crushing chamber and towards the middle portion of the mill hopper.
The term "crushed material" is here intended to include all of the material passing through the mill, that is the effectively crushed material, the fine gravel and sand-like throughgoing fractions as well as the not crushable fractions like reinforcement iron rods, pieces of wooden and aluminum door and window frames, large pieces of paper cement sacks, pieces of plastic sheets and so on.
After this preliminary introduction of the known mills it is pointed out that in all the prior art mills the desired space between the level 19 of the crushed material level in the mill hopper 9 and the top side of said discharging opening 11 is always provided in order to ensure the free transit of said bulky pieces, particularly of the large wood and metal frame pieces as well as the iron rods, which latter present indeed the most different dimensions and entanglement shapes.
As to the pneumatic aspect of the known hammer mills it is pointed out that in operation the rotating hammers act like fan wheels and create a strong depression inside the mill crushing chamber. This depression sucks a large air quantity from outside through the charging opening 4 and discharges this air quantity, jet-like, into the mill hopper. The formed air/dust mixture is exhausted through the discharging opening 11 above the material layer 6, as illustrated by the chain of arrows in FIG. 1.
Inside the mill crushing chamber takes place severe crushing phenomena, as well as severe abrasion phe
REFERENCES:
patent: 292488 (1884-01-01), Hexamer
patent: 2941731 (1960-06-01), Lykken et al.
patent: 3506200 (1970-04-01), Raudenbush
patent: 4650128 (1987-03-01), Goldhammer
Iperfin S.p.A.
Rosenbaum Mark
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