The roller mill is at present used exclusively for the grinding of grain in the manufacture of flour. It is, however, also suitable for grinding any moderately tough material that must be reduced to a very fine powder. Since this mill has a shearing action rather than crushing by direct pressure or having a rubbing action, it may be used where material is to be reduced to a moderately fine size but with the minimum of fines. See the picture above and below.
Construction & Working Process:
It contains two pairs of rolls, and the rolls in each pair rotate toward each other. The rolls are corrugated, and one roll of each pair turns faster than the other one. This results in a shearing action instead of the direct pressure that is brought about in the ordinary crushing rolls. The drive side of the mill, half in elevation and half in section. Shaft pulleys are attached to the fast roll of either pair. The driving belt takes a turn around these pulleys and around the idler pulley. This pulley drives an idler shaft which passes through to the opposite side of the roll stand. From the other end of his idler shaft, belts go to the slow roll of each pair. Above the rolls proper is an oscillating feeder that delivers the material to be crushed equally to both pairs of rolls.
One roll of each pair runs in fixed bearings. The other roll of each pair runs in bearings that are mounted on adjustable bell cranks. These bell cranks are pivoted at the bottom and are adjustable by a hand-wheel and screw at the top. In this way, the distance between the rolls, and therefore the amount of reduction accomplished in each pass, may be regulated.
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| vertical Roller Mill |
Construction & Working Process:
It contains two pairs of rolls, and the rolls in each pair rotate toward each other. The rolls are corrugated, and one roll of each pair turns faster than the other one. This results in a shearing action instead of the direct pressure that is brought about in the ordinary crushing rolls. The drive side of the mill, half in elevation and half in section. Shaft pulleys are attached to the fast roll of either pair. The driving belt takes a turn around these pulleys and around the idler pulley. This pulley drives an idler shaft which passes through to the opposite side of the roll stand. From the other end of his idler shaft, belts go to the slow roll of each pair. Above the rolls proper is an oscillating feeder that delivers the material to be crushed equally to both pairs of rolls.
One roll of each pair runs in fixed bearings. The other roll of each pair runs in bearings that are mounted on adjustable bell cranks. These bell cranks are pivoted at the bottom and are adjustable by a hand-wheel and screw at the top. In this way, the distance between the rolls, and therefore the amount of reduction accomplished in each pass, may be regulated.
Aashiq brother its very helpful article for all Chemical Engineering students... Excellent job you have done.keep it up.
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