Negative Pressure Grain Cleaning Machine / Gravity Destoner Machine

The machine for grain cleaning
To remove stone
To classify grain
To remove light impurities and so on

This stone separator has great separating performance. It can remove the light stones in grain's size from the grain flow, making great contribution to getting perfect products up to related food sanitary standards.

Principle
- The sieve box that is usually loaded with two-layer sieves is supported by hollow rubber springs and is caused to vibrate by one or two vibrators based on machine execution.
- The grain is spread by using a feeder across the entire width of that machine, and after that the grain stream is classified on the pre-separation sieve based on the specific gravity through the vibrating motion of the sieve and due to the air flowing passing through the grain from the bottom to top, the light particles are collected at the top, and the heavy ones including the stones at the bottom.
- The lower layer with the heavy particles streams upwards and is fed on to the final separating area of the bottom de-stoning sieve. Final separation of the stones out of the grain is completed by the countercurrent of air.
- The stone-free grain streams upon the two sieves floating on air cushions, moving slowly and gradually towards the grain outlet, and then is discharged via the squashed rubber valves.
- In order to achieve the optimum degree of separating and classifying, the inclination of the sieves, the air volume as well as last separation can be adjusted accordingly.

Application
- The destoning machine is ideal for removing stones from the continuous grain stream
- On the base of differences in specific gravity, removal of high-density impurities such as stones, clays and metal pieces and glass is achieved.
- As one of the most popular grain cleaning machines, it is widely utilized in raw material cleaning section in flour mills, rice mills, feed mills and seeds processing plant.

Features
1) Reliable and excellent classifying and de-stoning.
2) Negative pressure, no dust sprays out.
3) High capacity.
4) Easy operation and maintenance.