Exposed gear structure special for aluminum oxide mill and installation and operation method of exposed gear structure

The invention belongs to the technical field of transmission systems of ore grinding equipment in the aluminum oxide industry, and particularly discloses an exposed gear structure special for an aluminum oxide mill and an installation and operation method of the exposed gear structure. A first half gear and a second half gear are combined together to form a complete exposed split gear, the combination face of the first half gear and the second half gear is in a half contact type, the combination face of front-row combination bolts is in a contact type, and the combination face of rear-row combination bolts is in a recessed non-contact type. During installation, refined bolts of a combination bolt set between the contact type combination faces of the first half gear and the second half gear are installed firstly, then the combination bolt set between the contact type combination faces of the first half gear and the second half gear is installed, and after the mill operates for one week, under the hot state, la