Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Patent
1996-06-20
1998-04-28
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
2411522, 241228, B02C 1710
Patent
active
057434751
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a tubular mill for grinding natural and synthetic raw materials, in particular for the cement industry.
BACKGROUND ART
For grinding natural and synthetic raw materials, particularly in the cement industry, vertical mills are known comprising a track rotating about a vertical axis with two or more grinding rollers. The rollers rotate idly each about its axis (horizontal or inclined a few degrees to the horizontal) and comprise their own independent support and pressure systems.
Although the grinding efficiency of these mills is much higher than traditional tubular mills containing a load of different diameter balls, the material once having passed under the rollers is thrown outwards by the centrifugal force impressed on it by the grinding track, by virtue of the fact that the track rotates about the vertical axis. Said material thus has to be returned to the center of the track by pneumatic or mechanical systems for further processing under the rollers.
Such conveying systems however have a high energy consumption which largely nullifies the advantage of the vertical mill over traditional ball mills.
As a development of the aforesaid mills, tubular mills have been constructed with one or more grinding rollers pressed radially along a generating line of the mill. The rollers are supported by a single shaft inserted internally through the drum and supported externally at its two ends. This represents a constructional constraint which has limited its size and length, said shaft or beam being able to bend under the thrust of the rollers and having to be withdrawn axially and with difficulty in the case of mill maintenance. DE-C-626.565 discloses a tubular mill according to the preamble of claim 1.
DISCLOSURE OF INVENTION
The object of the present invention is to provide a mill which while maintaining the advantages of vertical tubular ball or roller mills is constructed in such a manner as to exert high optimized working pressures or each roller without prejudicing the structure, and allows easier maintenance, including on each individual roller.
This object is attained according to the present invention by a tubular mill for grinding natural and synthetic raw materials, in particular for the cement industry, according to claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics and advantages of the mill according to the invention will be more apparent from the description of some embodiments thereof given hereinafter by way of non-limiting example with reference to the accompanying schematic drawings, in which:
FIG. 1 is a longitudinal section through the mill of the present invention on the line I--I of FIG. 2;
FIG. 2 is a cross-section on the line II--II of FIG. 1; and
FIG. 3 is a longitudinal section through a further embodiment of the mill according to the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The figures show a tubular mill for grinding natural and synthetic raw materials, in particular for the cement industry. The mill is of the type comprising a rotary cylindrical drum 11 arranged with its axis horizontal and containing at least one grinding element.
In the embodiment shown in FIGS. 1 and 2, the drum 11 rigidly carries on its outer surface two rolling or sliding rings 12 each resting on a pair of rolling-contact rollers 13 or alternatively on hydrostatic or hydrodynamic slide shoes, not shown. The outer surface of the drum 11 is provided with a circular ring gear 14, of larger diameter than the two rings 12, which engages and is rotated by a toothed pinion 15 moved by a reduction gear 16 connected to a motor 17. At one end of the drum 11 there is positioned a cover element 18, which is fixed and is provided with a feed mouth 19 for the material to be ground. The cover element 18 also comprises a local aperture 20 through which ventilation air or gas is fed. This hot or cold co-current ventilation facilitates material advancement along the mill. The cover element 18 faces a drum end or entry opening 21 connected to a first grindi
REFERENCES:
patent: 1064680 (1913-06-01), Bartlet
Italcementi S.p.A.
Rosenbaum Mark
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