The threshing machine are provided with two,three or four layers of screen box,so it is not only have corn threshing fuction,but also can remove light,big and small impurities out.

After threshing and cleaning by the first machine,the corn seed goes to the sorting machine,the moulded kernels and injured kernels can be removed out  from processing, finally to get the best quality of the corn seed for further seed treating or food processing.

So the machines are widely used for seed selection and grading, agricutural products for food processing,etc.