Tire type grinding roller device of bowl type medium-speed coal mill

The invention belongs to the technical field of coal mills, and discloses a tire-type grinding roller device of a bowl-type medium-speed coal mill, which comprises a coal mill main body, a driving structure mounted at the bottom end of the coal mill main body, a grinding disc arranged in the coal mill main body, a plurality of grinding rollers arranged above the grinding disc, and a cleaning assembly arranged at the top end of each grinding roller, each grinding roller is fixedly installed at the bottom end of the triangular frame, the lubricating assembly is arranged in the triangular frame, the cleaning assembly is arranged, the grinding rollers can make contact with the bottom ends of the cleaning heads in the rotating process, and the surfaces of grinding roller tires are cleaned through the cleaning heads; the situation that some dirt is possibly accumulated on the surface of the grinding roller tire due to attachment of pulverized coal or other materials, and the dirt possibly affects normal work of the