GRINDING

Roller mill

The roller mill is ideal for installations that require homogeneous grinding, with a minimum percentage of fines. Its design allows obtaining uniform particle size, essential in layer formulas and other balanced feeds.
The roller mill stands out for its energy efficiency and versatility, adapting to different types of grains. It also reduces losses by avoiding the generation of excessive fines, improving the quality of the final product.
Render of a Rosal roller mill for animal feed production.

Features

Design

Independent drive and high-strength grinding chamber

The roller mill has an independent drive for each floor, with motor and transmission by pulleys and toothed belts.

The grinding chamber is made of high-strength steel plate for durability and includes a high-powered magnet for separation of metal particles.

Models

ModelMotor power (HP)Roller diameterRoller lengthABCCapacity (Tm/h)Weight (Kg)
MRR 2008 D2 x 15 (11 kW)20080014601260137014 - 181900
MRR 2512 D2 x 25 (18.5 kW)250125019901540158025 - 303800
MRR 3015 D2 x 40 (30 kW)300150023401690179040 - 505800

Frequently Asked Questions

How does the roller mill work?

The roller mill is an equipment used in animal feed mills to grind grains such as corn, wheat or soybeans. By means of the opposite rotation of two or more rollers, the material is shredded and reduced in size, which facilitates its mixing and subsequent pelletizing.

Where is the roller mill located within an animal feed mill?

In a feed mill, the roller mill is used in the milling stage after screening and before mixing. This process ensures optimum cleanliness and uniformity of the grain for subsequent mixing.

In which sectors can chain conveyors be installed?

Our roller mills are specially designed to meet the needs of the agro-industrial sector:

  • Compound feed mills

  • Cereal processing plants

  • Flour mills

  • Pet food factories

  • Biomass plants

  • Extrusion plants

  • Oilseed handling

  • Handling of cereals, flours and their by-products in general

How is the roller mill feed regulated?

Product flow is controlled by a manual feed valve. It should be opened as little as necessary to avoid overloading or clogging. Too much product can hinder automatic regulation and affect mill performance.

What maintenance is required?

The roller mill requires regular maintenance, which includes:

  • Grease after a certain number of working hours.

  • Periodic adjustment of belts and springs to ensure proper operation.

  • Frequent cleaning of the magnet to avoid accumulation of metal particles.

  • Revision of the limit switches to maintain safety during operation.

How is the roller gap adjusted?

The roller gap can be adjusted manually by handwheels or automatically with an electric motor and encoder. Correct adjustment ensures precise and uniform grinding, which is essential for feed quality. In both cases, it is necessary to check the distance with gauges and make sure to respect the mechanical safety stops.

What happens if the roller springs are not properly tensioned?

If they are loose, unground or improperly sized grain may pass through.

If they are too tight, the rollers may be damaged by overloading or foreign bodies.

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