Mixer workers are armed from head to foot, and just reveal two eyes. The powders were screening and mixing by turns and at least three times repeatedly, generally called three screening and three mixing. It is not only hard work but also low safeness. At the end of the last year, a machine can mixing powders called auto-mixer of pyrotechnics powders has passed the testing of provincial scientific and technological achievements, and applying to the fireworks and firecrackers industry. A machine can instead of three workers, and the costing time takes a third of workers. Separate man an machine, man and powder, and with remote handling, it cut off the accident . Because of the large advantages, Liuyang is forcing apply this machine as the new extending and rebuilding project of fireworks and firecrackers, and it will totally applying to industry in the next year of June.