These mills have a high speed vertical axis rotor on which some rigid hammers of suitable shape are fixed. The grinding action is provided by impact against a toothed lining and by friction between layers of the processed material. The product is pneumatically discharged upwards, through an air classifier. The dynamic classifier is designed according to the grinding requirement and is fitted onto the top of the mill.
The cage-type dynamic microclassifier fitted onto the mill, is suitable to obtain powders at a fineness up to 99% finer than 20 micron, with a high percentage of particles finer than 5 micron.
The oversize not passing through the micro-classifier falls down to the mill where it is further gound. The drive of the microseparator is independent and usually is made with a variable speed motor. This allows a very fine adjustment of the working speed of the microseparator directly from the control board. As a consequence, the fineness of the product can be easily adjusted in a wide range.
The mills type SV must be fed with dry materials with size up to 12 mm.
In simpler cases the SV mill could be fitted with a static air classifier of special design, suitable to obtain powders at a fineness up to 95÷98% through the 40 micron sieve.
The fineness is adjustable within certain limits by varying the arrangement of the static air classifier and/or the air flow through the mill
The SV-MICRO mills are suitable for contemporary grinding and drying of raw materials with moisture up to 10-12% by blowing hot gases through the mill (calcium carbonate, vegetables, limestone).
In case of heat sensitive materials or flammable, it’s possible to blow cold air or inert gas through the mill (coals, vegetables, cocoa)
In case of very abrasive raw materials it is possible to supply special wear protection, alumina lining, etc.
CONTRUCTION FEATURES •Screw feeder or rotary valve feeder. •Hammers of special heat treated steel •Toothed lining plates of wear resistant alloy •Shafts of Cr.Ni. steel supported by roller bearings enclosed in a dust tight, grease sealed box •It is possible to supply stainless steel machine •For any special problem, please contact our technical department
Cimma Ing. Morandotti SpA is operating since 1947 in the design and construction of machines and plants for processing of powders and bulk materials. The company has its offices and factory with 5000 sheltered sqm in Pavia.
Cimma Ing. Morandotti SpA manufactures a wide range of grinding mills and pulverizers designed by its own technical department.
The Engineering Service of Cimma provides the design of complete plants and the evolution of machines for new applications and new technologies. One test and research room with laboratory is available at Cimma´s factory, where new applications and technologies are tested and developed, including the criogenic grinding of heat sensitive materials.
The main application markets of Cimma´s machinery are:
Ceramic Industry for dry preparation of raw materials
the Processing of building materials (classified sand, lime, plaster, dry mortars)
Chemical Industry preparation of solid fuels (petroleum coke, coal, sawdust, grog)
Feed / food industry (spices, licorice, micronizing of cereals)
Recycling of industrial and civil waste.
The reliability of machines supplied by Cimma, the expert engineering service, the efficient technical assistance with spare parts stock have been appreciated along the time by outstanding clients and allow relevant export sales to many countries, directly and through important main contractors.
High focus is constantly given to ambient protection and safety of Cimma´s products.