Multifunctional crushing device with dust suppression and protection functions special for underground coal mine excavation

The invention relates to the technical field of coal mine excavation, in particular to a dust suppression and protection multifunctional crushing device special for underground coal mine excavation. When the device works, materials enter the crusher from a feeding port and then enter a feeding groove after being guided by a flow guide plate, at the moment, a turnover plate is stressed to turn over in a mounting frame, then the materials pass through, and after the materials pass through, the turnover plate is reset to seal and block the feeding groove, so that the crushing efficiency is improved. Materials enter the crushing box and then make contact with the two crushing wheels to be crushed, in the working process of the device, the draught fan works, the air pipe starts to suck air, dust in the crushing box and the crusher penetrates through the through holes in the first filter screen to enter the air box, the content of the dust in the crusher is reduced, the materials can be crushed in a sealed mode in