Arrangement for crushing and cooling material passing out of a f

Details Arrangement for crushing and cooling material passing out of a f Arrangement for crushing and cooling material passing out of a f

1994-11-15

1996-12-03

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With temperature modification of material

2412851, 110232, B02C 428

Patent

active

055800050

DESCRIPTION:

BRIEF SUMMARY
The smaller and more uniform the particle size of fired material, the more quickly and uniformly it can be cooled. This has a favorable effect on the size of the cooler and the quality of the product. For the purpose of comminuting the fired material the arrangement of a crusher immediately following the oven, upstream of the cooler, has therefore already been considered. For this purpose preference is given on the one hand to crushers working at high speed and permitting passage without cooling air, such as percussion rebound crushers (DE A 29 25 665, DE C 33 23 565, FR A 2 194 133) and on the other hand jaw crushers (WO 92 21 441). Comminution on rolls is also considered (DE B 27 47 732), without it being known in detail how this is to be achieved. In all cases it must be expected that a crusher working in the hot region between the oven and the cooler, at temperatures between 1000.degree. and 1500.degree., will require considerable maintenance work, which can be done only at ambient temperature and therefore require the removal of the crusher from the hot region. This requirement is all the more difficult to meet, the larger the crusher. This would at first glance speak in favor of high-speed and correspondingly smaller crushers and against low-speed, heavy types of crushers, such as jaw crushers and roll crushers.
The invention has however realized that the maintenance problem can be particularly easily solved by using a crusher which, after the style of a roll crusher, comprises a plurality of roll-like crushing elements, provided that the latter are according to the invention mounted overhung outside the path of the material and project retractably into the path of the material.
This arrangement has on the one hand the advantage that the bearing devices, as such, are not subjected to the high temperature of the working region. Consequently, less maintenance is required for the bearing devices, and the maintenance can in fact often be carried out even without interrupting operation. If the crushing elements themselves require maintenance, they can simply be retracted individually together with their bearing device and be serviced or replaced. Since the entire crusher is composed of a plurality of roll-like crushing elements, the operation of only a part of the crusher is then interrupted, and such an interruption is therefore tolerable in many cases. In addition, appropriate selection of the direction of rotation of the crushing elements adjacent to the retracted crushing element makes it possible to ensure that as little material as possible falls through the gap in the crusher caused by the retraction of this crushing element. If the falling-through of part of the uncrushed fired material is not to be tolerated, it is also possible to cover the crushing element to be serviced with a bridging element before it is retracted, the bridging element, which for example may have a roof-shaped configuration, diverting the fired material to the adjoining crushing elements.
The roll-like crushing elements may be customary crushing rolls, such as are known in roll crushers. However, since the material to be crushed which comes from the oven is not as a rule hard and brittle, as is the case for the usual field of application of roll crushers, but is doughy and viscous to crumbly, the crushing elements may also have a different configuration to suit the specific nature of the material to be crushed. They may for example be smooth or have radially projecting barbs or cutting edges engaging in one another.
In the context of the invention it is important that, from whichever side they may project into the region of the material, the roll-like elements together cover a cross-sectional area covering the entire region within which the presence of material to be crushed is to be expected. As a rule this will be the entire cross-sectional area in which the material is passed from the oven to the cooler, that is to say for example in which it falls from the ejection opening of a rotary tubular oven. If, however, the prese

REFERENCES:
patent: 2539775 (1951-01-01), Gordon
patent: 3633889 (1972-01-01), Beckum et al.
patent: 4133693 (1979-01-01), Nudelman et al.
patent: 4630781 (1986-12-01), Brown et al.

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