Sprayer is a kind of machine that disperses liquid into mist. It is a kind of machinery. It is divided into agricultural, medical and other purposes (such as industrial use), agriculture is classified as agricultural machinery, and it is generally called human-driven sprayer. Power (engine, motor) driven sprayer. The sprayer is divided into hydraulic, pneumatic and centrifugal sprayers according to the working principle. According to carrying methods, it is divided into hand-held, backpack, shoulder-strap, pedal, stretcher, cart, self-propelled, vehicle-mounted, suspended, etc., as well as aviation sprayers.