For separating stones from a continuous product stream. Reliable removal of high density impurities such as stones and pieces of metal and glass is achieved on the basis of differences in specific gravity. Design: with or without air – recycling system.
Mode of Operation
The gravity-fed gain is spread by a feeder. Which at the same time acts as an air seal, across the entire width of the machine. On the pre-separation screen, the product stream is stratified according to its specific gravity by the oscillating motion of the screen and by the air flowing through the product from bottom to top. The light particles collect at the top, and the heavy ones including the stones at the bottom. The lower layer with the heavy particles flows upward and is fed to the final separation zone of the bottom destining screen. Final separation of the stones from the grain is accomplished by a countercurrent of air.
The stone-free product streams on the two screens float n cushions of air, flowing slowly toward the product outlet. Discharge is effected through rubber squeeze valves.
The sieve box is supported by hollow rubber springs and is caused to oscillate by one or two vibrators depending on machine execution.
The inclination of the screens, the air volume and final separation can be individually adjusted to achieve the optimum degree of separation. For capacities below 6th, the machine is applied with a single screen deck.