Oil pump assembly and coal mill

The invention provides an oil pump assembly and a coal mill, and relates to the technical field of oil pumps. The oil pump assembly comprises a motor, a bearing box and an oil pump, wherein the bearing box comprises a bearing seat, a conversion shaft, a bearing and a coupler, the conversion shaft, the bearing and the coupler are all arranged in the bearing seat, the conversion shaft is rotationally connected with the bearing seat through the bearing, and a first connecting end and a second connecting end are formed at the two ends of the conversion shaft respectively; and an output shaft of the motor is in transmission connection with the first connecting end through the coupler, and the second connecting end is in transmission connection with a shaft sleeve of the oil pump. The bearing box is additionally arranged between the motor and the oil pump, simple disassembly and maintenance between the oil pump and the motor are achieved, the maintenance efficiency is improved, related structures of the motor and t