Production method for square smoke flue and special mould

The invention provides a production method for a square smoke flue and a special mould, and belongs to the technical field of smoke flues. According to the method, the four side faces of the smoke flue are formed by pouring at a time through a V-shaped special mould body and an inverted-V-shaped special mould body erected on the inner side of the upper portion of the V-shaped special mould body, and the cross section of the poured smoke flue is of a square structure. The special mould comprises two rectangular outer mould plates hinged to form a V-shaped structure, two lifting assemblies arranged on the outer sides of the two rectangular outer mould plates, two rectangular inner mould plates hinged to form an inverted-V-shaped structure, and two supporting assemblies arranged on the inner sides of the two rectangular inner mould plates. According to the production method for the square smoke flue, operation is simple, the square smoke flue is formed at a time in the producing process, the method is efficient