Electromagnetic stirring device and method for secondary cooling zone during slab continuous casting

An electromagnetic stirring device for a secondary cooling zone of slab continuous casting comprises comprising a main body, an opening adjustment assembly, and a secondary cooling assembly, wherein

• the main body of the electromagnetic stirring device comprises a protective shell (3), a phase sequence control assembly, an iron core (4), and an electromagnetic coil (5) disposed within the protective shell (3),
• the opening adjustment assembly comprises a cylinder (7), a fixing base (8), a movable joint shaft (12) and multiple pieces of silicon steel sheet group inserts (13) that are sequentially connected by the movable joint shaft (12) to form multiple movable joints, wherein the silicon steel sheet group inserts (13) are rotatable around the movable joint shaft (12), and the multiple movable joints are connected with the iron core (4) to form a closed annular structure, wherein an electromagnetic coil (5) is wound on the iron core (4), and the electromagnetic coil (5) is operated by the phase sequence control assembly for generating an alternating magnetic field in a closed annular structure, and a casting slab (1) passes through an alternating magnetic field in the closed annular structure, and wherein the cylinder (7), which is fixedly installed on an outside of the main body of the electromagnetic stirring device through the fixing base, has a piston end connected with the main body of the electromagnetic stirring device and provides a driven force for opening and closing of the multiple movable joints, and
• the secondary cooling assembly comprises a cooling water inlet (9) disposed at an end outside the protective shell (3) and multiple cooling water nozzles (10) spaced apart from each other and disposed at an end inside the protective shell (3) and facing the casting slab (1), cooling water is transmitted through the cooling water inlet (9) into the protective shell (3), wherein the electromagnetic coil (5) and the iron core (4) are immersed, and the cooling water is sprayed onto a surface of the casting slab (1) through the multiple cooling water nozzles (10).