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Product Overview Crusher Models Technology Applications Brochures Request For Quote 
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Angle of Nip - The angle formed between the moving surface of a crusher roll or jaw plate and the stationary plate surface, at which point the material will be pinched. Angle varies with machine size and material lump size.
Breaker Block (Breaker Plate) - The steel anvil surface of a crusher against which material is crushed by impact or compression. Bridging - Blocking of crusher opening by large pieces of material. Burbank Abrasion Test - A standard method of comparing the relative abrasiveness of rocks, minerals and ores. Cage - A screening device, fixed or adjustable, made of precisely spaced bars or slotted plate, where final sizing is accomplished within the crusher. Choke Feed - Operating the crusher with a completely filled crushing chamber. Choke Point - Location in the crushing chamber with the minimum cross section. All compression type crushers have choke points. Circulating Load - The amount of oversize returned to the crusher from a screen in a closed-circuit system. Closed-circuit Crushing - A system in which oversize material is screened from the output and returned for another pass through the crusher. D50 - Denotes that output size is 50% smaller than the size indicated. Feed - Input to the crusher. Feeder - A device that regulates flow rate and when combined with an appropriate hopper distributes material across the crusher. Fines - A term used to describe a portion of the overall gradation of a material from a specific size to dust. The use of the term varies from industry to industry; what is considered fines in one industry may be considered coarse in another industry. Fines are desirable in some applications, and unwanted in others. Finished Product (Output) - The resulting material after it has been processed. Friability - Characteristic of material that describes its resistance to breakage. Hammers - Free-swinging or fixed metal impact surfaces attached to the rotor assembly of an impactor or hammermill crusher. Sometimes designated as "beaters". Hardgrove Index - The grindability of a coal is expressed as an index showing the relative hardness of the coal compared with a standard coal of 100 grindability. Height of Drop - Vertical, free fall distance from the lip of the feeding device to the inlet of an impactor or hammermill crusher. Normally applies to reversible machines. Hopper - The area of the crusher preceding the crushing chamber. Also, an external bin that holds the input material.. MOH Scale - Relative hardness of material compared to 1-Talc, 2-Gypsum, 3-Calcite, 4-Fluorite, 5-Apatite, 6-Feldspar, 7-Quartz, 8-Topaz, 9-Corundum, and 10-Diamond. This is an abrasive index and is not related to friability. Nominal - Describes output size, usually denoting that at least 90% of output is smaller than size indicated. Oversize - Material too large to pass through a specific size of screen or grizzly opening. Plugging - Stoppage or restriction of the flow of material through the crusher, usually the result of wet and sticky material clogging exit points. Primary Crusher - The first crusher in a crushing system to which material is fed. Succeeding crushers in the system are referred to as secondary and tertiary crushers. Product - Output from the crusher. Reduction Ratio - The ratio of the top size of input material to the top size of crusher output. Reversible Crushers - Hammermills and impactors with rotors that can be run both clockwise and counterclockwise. ROM - Run Of Mine - Material from a mine that has not been crushed or screened. ROQ - Run of Quarry - Material from a quarry that has not been crushed or screened. Rotor - Rotating assembly of shaft, discs, and hammers within a crusher which imparts the crushing forces to the material. Scalping - Removing all sizes smaller than output top size from the crusher input material. Screen Bars - The bars in the cage of a hammermill or granulator, spaced to control the output size. Also called "cage bars" and "grate bars". Slugger Teeth - The large teeth on a single-roll crusher which first strike the material. Sorbent - Stone containing calcium, used to capture sulfur in a fluid bed boiler . Tailings - Refuse or residue material from a screening process. Top Size - The largest particle size in an input or output gradation. Tramp Iron - Bolts, shovel teeth, picks and other uncrushable metal that is often present in crusher input material.
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