Crushing and screening all-in-one machine for coal sample preparation

According to the technical scheme, the crushing and screening integrated machine is characterized in that the crushing and screening integrated machine comprises two supporting plates, a bearing plate is arranged between the two supporting plates, a processing bin is fixedly installed between the two sides, close to each other, of the two supporting plates, and a rolling column is arranged in the processing bin; a sleeving hole is formed in one side of the machining bin, a driving motor is fixedly installed on one side of the machining bin, the outer circle wall face of a rotating shaft of the driving motor and the inner circle wall face of the sleeving hole are movably arranged in a sleeving mode, and one end of the rotating shaft of the driving motor and one end of the rolling column are fixedly installed; the replacement assembly is arranged on the bottom surface of the processing bin and used for crushing and screening out coal samples with different diameters, a fixing block is arranged, the fixing block