The silos are divided into buffer silos, raw material silos and finished product silos. In order to improve the production efficiency, the silos are configured at the upstream and downstream of the granulator, pulverizer and dryer, so that there are always a batch of prepared materials waiting for forming, mixing or packaging, which can reflect the advantages of sealing, reducing dust and buffer. The raw material bin is equipped with pressure relief explosion-proof, negative pressure pulse dust removal, motor stall alarm, spray spark detection linkage system, loading and unloading level meter and intelligent control system.