Silos can be used to store various types of materials, including powder, granular and liquid materials. In industrial production, common types of silos include flat-bottom silos, cone-bottom silos and cylindrical silos. The principle of silos is to automatically supply and convey materials based on the weight of the materials. Feeding devices such as feed ports, exhaust devices and detection devices are provided on the top of the silo. When the materials in the silo are used up or reach a certain level, the feeding device will automatically start to send new materials into the silo to maintain a constant supply of materials.