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Roll Crushers |
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Single, double and multi-shaft versions
Compact design allows retro-fitting into existing process lines
Ideal for de-agglomeration of material from sacks or silos and for granulating
coarse, lumpy, caked or compacted material
Maybe mounted in support frame or fitted directly to process line
The ROLL CRUSHER is a rugged slow-running machine used for pre-crushing lumpy material prior to further immediate processing or finer grinding. The Single Roll Crusher can process up to 10 tonne per hour to an end particle size ranging from “walnut” to “hazelnut” dimensions, although output and the degree of fineness depends on the material being crushed. Friable materials, for example, are reduced to a much smaller size.
Applications abound in the chemical, foodstuff, pigments and pharmaceutical, coal and agrochemical industries.
The de-lumping feature greatly enhances flow of materials between processes.
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A DOUBLE or MULTIPLE ROLL CRUSHER is specified where larger material lumps are to be reduced. This option has a greater “live-bed” crushing area. The Double or Multiple Roll Crusher is fitted with two or more roller shafts running at differential speeds. The shafts can be specified to run either inwardly or outwardly.
TYPICAL USES
Pre-crushing of resins prior to dissolving
De-lumping of pigment prior to dispersion
Reduction of damp and caked materials
Separation of agglomerates of plastic granules
CONSTRUCTION
The rugged welded housing is box-shaped and accommodates either single, double or multiple roller shafts, the crushing cams, the crushing combs and the stripper combs. It is designed to produce little or no dust. Models are available in normal carbon,acid resistant stainless steel, hastelloy and wear resistant steel.
The crushing cams of cast steel are mounted on the roller shaft in staggered positions, accurately spaced so that they pass between the crushing and stripping combs which are mounted laterally on opposite sides of the inner housing. Both sets of combs are identical in design but have different functions according to the direction of rotation. Different-shaped crushing elements are available, depending on whether the material is hard, brittle, viscous or moist. Screens can be fitted for special applications.
OPERATING PRINCIPLE
Feed material is introduced to the crushing area by hopper, feeder or directly from a previous process. The crusher can be choke fed and is therefore ideal for silos and spray towers.
The material is seized by the rotating crushing cams and broken against the crushing combs until small enough to pass through and out of the machine. Fine particles included in the feed-stock fall through the combs without being crushed. If certain materials cause a blockage, the rotating shaft automatically reverses its direction, temporarily, to free the material. The bearing plates at both ends of the housing accommodate the roller bearings, protected by radial seals, in which the shaft rotates. The shaft apertures in the end plates are protected by PTFE seals pressure-proofed to 0.5 bar, IP54. The second shaft on the Double or Multiple Roll Crusher is driven by grease-lubricated gear wheels on the outside of the housing.
The maintenance requirements on the Roll Crushers is minimal. The crushing cams, crushing combs and stripper combs are easily removable for cleaning.
The below standard crushers are driven by a hollow shaft worm reduction unit with an integral torque limiter from a flange mounted motor.
The torque limiter has the ability to stop rotation of the crusher shaft whenever the stall torque exceeds the calibrated value, thus safeguarding the transmission components if hard tramp material enters the crushing chamber. These units are ideal for fitting into
process lines and are held on by the inlet and outlet flanges and therefore do not require any bulky support frames.
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