Optimal size reduction with roller crushers by Händle

In materials preparation, roller crushers are responsible for the “rough stuff“. They are optimally suited for the primary size reduction of soft or hard, moist or dry clods of clay with or without rock inclusions exhibiting Mohs hardness levels up to 6. Roller crushers render cloddy raw materials meterable and prepare them for effective further processing in downstream equipment. Size reduction is achieved by application of pressure and shear forces between two slowly rotating rollers, which may or may not be equipped with one-piece toothed disks or individually replaceable knives. The choice of crushing elements depends on the nature of the mill feed and on the targeted grain size. It is important that the knives or teeth be properly arranged in a spiral pattern, hence reducing the number of knives/teeth in simultan­eous engagement, so the mill feed is moved around more over the rollers during comminution. This also avoids overloading and requires less power. The size-reduction ratio is easily adjusted by altering the roller gap anywhere between approx. 5 mm to 100 mm.

Händle makes two basic types of roller crushers: WMH with hydraulic drive and WMM with mechanical drive. The WMM models have advanced drives with modern conical spur gears and flanged-on motors. An interposed clutch that separates motor and gearing in case of an overload ensures very good operational safety and reliability. This also makes the drive assembly much more compact than before, with its previously employed type of coupling and belt drive. For raw materials containing substantial amounts of hard rock inclusions, reverse mode is recommended, and hydraulic crushers are particularly good at that. As soon as a certain, preset torque is exceeded, both rollers automatically go into reverse. The rock causing the overload is forced into a different position, making it easier to split and crush. The mechanical roller crushers can also be designed for reverse-mode operation. All they need is a variable-frequency motor. The standard version needs no such motor, because roller crushers are normally operated at a constant speed of rotation.

The size of the crusher depends on the throughput and on the nature of the mill feed. Each crusher comes mounted on a base frame for easy installation. A number of options are available for optimal customerization.

x

Related articles:

Issue 2008-12 Preparation

One of the biggest: Händle‘s optimized WMH 818a roller crusher

With a maximum volumetric throughput of some 250 m³/h and a maximum feed size of roughly 1 000 mm, the hydraulically powered WMH 818a roller crusher is one of the biggest on the market for the...

more
Issue 2013-10

Händle extruder E 25 successfully introduced to the Chinese market

The first report about the newly engineered type-E 25 extruder with barrel diameters of 200 mm and 250 mm appeared in Zi Annual 2011. Now, just last spring, Händle‘s first ER 25a/20 de-airing...

more

Hazemag & EPR GmbH

Hazemag & EPR GmbH in Dülmen introduces the Hazemag Variowobbler, which represents a new generation of wobbler feeders for pre-screening operations in crushing plants. An outstanding feature of this...

more
Issue 2017-3 Convincing performance

Argentine brick and tile producers trust in preparation equipment by Händle

In recent months, Händle GmbH Maschinen und Anlagenbau has received a number of major commissions for brickyards in Argentina, hence significantly strengthening their market presence in South...

more
Issue 2011-9 Technical News

High-performance fine roller mill Alpha II by Händle

Händle’s (www.haendle.com ) rollout of the Alpha II in the year 2000 marked the appearance of a whole new generation of hinge-type fine roller mills for ceramic materials. Today, more than 80 Alpha...

more