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Double roll crusher
Henan Fengde Beneficiation Division (China)
November 21st, 2010
Country of Origin
: Fengde Machinery
: 2PG series
Roll crushers have a theoretical maximum reduction ratio of 4:1. If a 2 inch particle is fed to the roll crusher the absolute smallest size one could expect from the crusher is 1/2 inch. Roll crushers will only crush material down to a minimum particle size of about 10 Mesh (2 mm). A roll crusher crushes using compression, with two rolls rotating about a shaft, towards the gap between the rolls. The gap between the rolls is set to the size of product desired, with the realization that the largest feed particle can only be 4 times the gap dimension.
The particles are drawn into the gap between the rolls by their rotating motion and a friction angle formed between the rolls and the particle, called the nip angle. The two rolls force the particle between their rotating surface into the ever smaller gap area, and it fractures from the compressive forces presented by the rotating rolls. Some major advantages of roll crushers are they give a very fine product size distribution and they produce very little dust or fines. Rolls crushers are effectively used in minerals crushing where the ores are not too abrasive and they are also used in smaller scale production mining of more abrasive metal ores, such as gold. Coal is probably the largest user of roll crushers, currently, though. Coal plants will use roll crushers, either single roll or double roll, as primary crushers, reducing the ROM coal. Usually, these crushers will have teeth or raised forms on the face of the roll. (Roll crushers used for minerals and metal ores have smooth faced rolls.)
Henan Fengde Machinery Manufacturing Co.,Ltd. is a heavy machinery manufacturer subordinated to China Mechanical Industry Mechanization Construction Controlling Company. The leading products include whole set mine-selecting equipment and sandstone equipment such as ball mill, crusher, raymond mill, Jaw crusher, Hammer crusher, Double roll crusher, sand-maker, vibrating screen, sand washer, conveyor, sand making machine, aac equipment,etc.Mine-selecting equipment is applicable to select non-ferrous metal ore such as iron, copper, gold, silver, lead, tungsten, molybdenum, manganese and non-metal ores such as fluorite and quartz. Sandstone equipment is applicable to construct airport, railway, freeway, average highway, national large bridge, sub-bottom tunnel, land tunnel and new-type high building. It has fixed assets amounting to RMB103,260,000, 800 staffs and 120 technicians. After more than tewenty years' development, the factory has built itself into a comprehensive enterprise that comprises scientific research, test, manufacture, and service. The products have won many awards of varied levels and passed the attestation of ISO9001 Quality Control System SGS of Sweden. There are four plants and two companies affiliated to this factory.