SCREENING
Grain cleaner
Features
Design
Efficiency and protection in the separation process
Models
High-capacity grain cleaner
Rosal has a high capacity grain cleaner for industrial processes where large volumes of cereal need to be cleaned quickly and efficiently.
Processing capacity up to 150 tn/h.
5 sorting outputs:clean grains, small grains, residues, and powder separated in two stages.
Rotary screen system with a total area of 32 m² for efficient separation.
Double suction (inlet and outlet) that removes dust and chaff by vertical air flow.
Accessible and easily adjustable controls to optimize airflow.
Solid construction, designed for continuous operation with low maintenance.
Models
| Model | Screening area (m2) screening area (m2) | Capacity (m3/hour) |
|---|---|---|
| PR-70 | 1.6 | 20 - 75 |
| PR-100 | 3.6 | 36 - 135 |
| PR-140 | 6 | 66 - 225 |
| PR-160 | 10.7 | 102 - 300 |
| PR-200 | 17 | 143 - 338 |
| PR-200-E | 22.6 | 189 - 450 |
Frequently Asked Questions
A grain cleaner works by means of a screening and suction system that separates the grain from the impurities. The product enters the machine and passes through one or more perforated screens, where large impurities or small grains are retained depending on the size of the sieve. Simultaneously, an air suction system extracts light particles such as dust, straw or husks. The clean grain is collected through a specific outlet, while the residues are evacuated through separate channels. The whole process is continuous and automatic.
The grain cleaner is normally installed in the raw material receiving line, just after the unloading system (hoppers, weighbridge or truck pit). Its function is to clean the grain before storing it in silos or sending it to milling, preventing impurities from damaging the equipment or contaminating the final product.
The cleaners are mainly designed for cereals such as wheat, corn, barley, oats, rye, but can also be used for oilseeds, pulses or non-food granular products, provided they have a density and grain size compatible with the installed screens.
A grain cleaner can eliminate:
Large impurities: stones, branches, clods of earth, straw.
Dust and light particles by aspiration.
Broken or small grains by screening.
Non-usable waste according to the design of the outlets.
It depends on the type of cereal and the desired degree of cleanliness. In general:
Screens of 15-20 mm for wheat, oats, barley.
Screens of 25-30 mm for corn, sunflower or larger products.
The objective is to allow the passage of useful grain and to retain both large impurities and unwanted small grains.
Regular cleaning of screens, chambers and outlets.
Periodic greasing of bearings and seals.
Engine overhaul, direction of rotation, vibrations.
Inspection of closures, covers and safety protections.
Replacement of screens in case of wear or perforations.
Performance decreases when processing wet grain, as it tends to clog the screens, cause residue buildup, and reduce the efficiency of the aspiration system. It is recommended that the product be dry or pre-dried before entering the pre-cleaner.
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