Star unloader works star unloader known rotary feeder, airlock, is made with several rotor blades rotate within the cylindrical casing, the material from falling into the upper hopper, filled in the space between the blades, with the blades rotating unloading. Performance advantages and features 1, high precision machining of the product, with air lock function can be used to crush, quantitative grading system powder feeder, but also as a separation, dust collection systems, such as unloader, or for pressure feed type, suction feed type pneumatic conveying systems. 2, with a pressure-equalizing device can be used in pressure, negative pressure conveying system. 3, can be cast iron, cast steel, stainless steel, titanium, steel and other materials, the flange can be square or round the mouth and other structural forms, to meet the different needs of users.