Industrial and mining vehicle and power head thereof

The utility model discloses an industrial and mining vehicle and a power head thereof. The power head comprises a transmission part, a main shaft, a box body, an oil seal and a lining. Wherein the main shaft is coaxially and fixedly connected to the transmission part; a mounting space and a through hole are formed in the box body; a shaft hole is formed in the bushing; the main shaft penetrates through the mounting space in the rotating axis direction and is inserted into the through hole; the oil seal is positioned between the main shaft and the box body; the bushing sleeves the main shaft and is fixedly connected with the main shaft; the bushing is positioned between the oil seal and the main shaft; the bush is constructed to be provided with a first rotating part and a second rotating part which take a rotating axis as a rotating center; the first rotating part is fixedly connected with the main shaft; the second rotating part is formed at one end of the first rotating part; the shaft hole penetrates throu