the use of nitrogen protection to ensure that the machine in a safe environment.nitrogen protection system : In large hinged structure and an on-line cleaning device: according to the GMP specification, centrifuge cover designed large hinged structure, maintenance and filter installation more convenient; in the centrifuge is arranged in an inner cavity cleaning device, according to process requirements in centrifuge in runs and during centrifugal machine cavity for cleaning, which can effectively eliminate the batch room pollution.