Multi-stage screening device facilitating production and processing of hydroxypropyl methyl cellulose

The utility model discloses a multistage screening device convenient for hydroxypropyl methyl cellulose production and processing, which belongs to the field of screening devices.The multistage screening device comprises a separating box, a feeding hopper, a screening mechanism and an auxiliary mechanism, the top of the separating box is fixedly connected with the feeding hopper, and the bottom of the separating box is fixedly connected with a discharging box; the screening mechanism comprises a first screen, a second screen and a hemispherical hopper, the first screen is slidably mounted in the separation box, the bottom of the first screen is fixedly connected with the second screen, and the bottom of the second screen is fixedly connected with the hemispherical hopper; the pneumatic push rod and the screening device are arranged, fibrous materials and dust-shaped materials can be separated under screening of the first screen and the second screen, the air inlet pipe, the flow guide plate and the air nozzle