Small bag is used for unloading operations of 25 kg or 50 kg powder and granular materials in bags.It is applied in the plastics industry, food industry and other industries. For the powdery and granular materials like all kinds of additives, lime powder and PVC powder to do the dry bag opening unloading operations of powdery and granular materials. It automatically by the artificial products dumping steps such as the material falls into the storage hopper by gravitational force to complete the bag opening unloading work. Dust are carried by dust generated by the device filter that workers can easily work in a clean environment. It has the advantages of simple structure and is reliable with small power consumption and it will not lead to the material production damage, etc. It is especially suitable for toxic, flammable and strong corrosion occasion of high dust.