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2. Roller mill - Wikipedia

   en.wikipedia.org/wiki/Roller_mill

   Six-roller mills have three sets of rollers. In this type of mill, the first set of rollers crush the whole kernel, and its output is divided three ways: Flour immediately is sent out the mill, grits without a husk proceed to the last roller, and husk, possibly still containing parts of the seed, go to the second set of rollers.

3. Pulverizer - Wikipedia

   en.wikipedia.org/wiki/Pulverizer

   Similar to the ring and ball mill, the vertical spindle roller mill uses large "tires" to crush the coal. These mills are usually found in utility plants. Raw coal is gravity-fed through a central feed pipe to the grinding table where it flows outwardly by centrifugal action and is ground between the rollers and table.

4. Roller (agricultural tool) - Wikipedia

   en.wikipedia.org/wiki/Roller_(agricultural_tool)

   The roller is an agricultural tool used for flattening land or breaking up large clumps of soil, especially after ploughing or disc harrowing. Typically, rollers are pulled by tractors or, prior to mechanisation, a team of animals such as horses or oxen. As well as for agricultural purposes, rollers are used on cricket pitches and residential ...

5. Mill (grinding) - Wikipedia

   en.wikipedia.org/wiki/Mill_(grinding)

   The roller press has a certain similarity to roller crushers and roller presses for the compacting of powders, but purpose, construction and operation mode are different. Extreme pressure causes the particles inside of the compacted material bed to fracture into finer particles and also causes microfracturing at the grain size level. Compared ...

6. Vertical roller mill - Wikipedia

   en.wikipedia.org/wiki/Vertical_roller_mill

   Material grinding process motor through reducer rotating drive disc, the material falls from the mill under the central entrance and exit, under the action of centrifugal force to the disc edge by the roller to move and the crushing, grinding out lap after the material was speed up the flow to and vertical mill with one of the separator, after the meal by the separator back to the mill, the re ...

7. Heyl & Patterson Inc. - Wikipedia

   en.wikipedia.org/wiki/Heyl_&_Patterson_Inc.

   In 1904, Heyl & Patterson pioneered the first cranes to lift entire railroad cars, as well as towers to unload barges filled with ore, coal, sand, and slag. 1905 saw the introduction of coal crushers, coke preparation plants, coal handling bridges and mine car dumpers. 1908 saw the first skip hoists and ore bridges to transfer material at steel ...