Crushing and filtering device with nitrogen protection

The invention relates to the technical field of smashing devices, in particular to a smashing and filtering device with nitrogen protection, which comprises an exhaust pipe, a collecting mechanism is arranged on the outer surface of the exhaust pipe, the collecting mechanism comprises a connecting pipe and a processing pipe, and the inner surface of the connecting pipe is communicated with the inner surface of the exhaust pipe in a penetrating manner; a through connecting groove is formed in the treatment pipe, the outer surface of the connecting pipe is fixedly connected with the inner surface of the connecting groove, the inner surface of the connecting pipe is fixedly connected with a fan, the inner surface of the treatment pipe is slidably connected with a sealing plate, and the inner surface of the treatment pipe is communicated with a negative pressure valve pipe in a penetrating mode. The problems that when existing smashing and filtering equipment with nitrogen protection is used, nitrogen is prone to