Big drop coal breakage pipe with return air function

The utility model relates to a big drop coal breakage pipe with return air function compares the coal breakage socle portion that has solved and leads to the fact the coal dust air current that contains of great pressure to overflow to the baffle box all around because of the coal flows the impact with prior art, result in environmental pollution's defect. The utility model discloses well coal breakage pipe body is installed in the below of belt feeder head funnel, and the flapper is installed to the lower part of coal breakage pipe body, and install in the baffle box lower part of flapper, still includes the return air duct, open on the upper portion of said coal breakage pipe body pipe wall has suitable for readingly, and open the lower part of coal breakage pipe body pipe wall has the end opening, suitable for readingly vertically correspond with the end opening, said return air duct is installed on the pipe wall of coal breakage pipe body, the upper end and suitable for reading the communicating with each other of return air duct, and the lower extreme and the end opening of return air duct communicate with each other. The utility model discloses will flow down the high pressure draught district of the coal breakage socle portion of production and the low-pressure air current district on upper portion links to each other because of the coal, utilize the pressure differential guide to contain coal dust air current flow direction coal breakage and manage upper portion.