▎ 摘　　要

NOVELTY - The utility model claims graphene mixing front conveying negative pressure fan, comprising a device main body, the device main body comprises a machine frame, a protective cover, a protective device, a dismounting device and a fan assembly, one side of the machine frame is provided with a protective cover, the protective cover is provided with a protective device, the protective cover is provided with a fan assembly, the machine frame is provided with a dismounting device, the dismounting device comprises a mounting groove, a connecting block, a third bolt, a handle, the top part of the frame is provided with a mounting groove, the mounting groove is slidingly connected with a shutter frame, two ends of the shutter frame top part fixedly connected with a connecting block, the connecting block is connected with a third bolt through the screw thread, through the set of the protective device, the negative pressure fan plays a protective role, effectively reducing the dust entering the negative pressure fan, then through the setting of the dismounting device, by screwing the third bolt, convenient for maintenance of the negative pressure fan, improving the practicability of the negative pressure fan.