High-torque-hydraulic detachable type bearing vibration measuring instrument mandrel

The utility model discloses a mandrel of a high-torque-hydraulic detachable bearing vibration measuring instrument. The mandrel comprises a shaft body and a sealing ring. The sealing ring is arranged in the sealing ring groove of the shaft body; an oil inlet hole and an oil outlet hole are formed in the shaft body, and a dustproof groove is reserved in the working surface. In the bearing vibration measurement process, the inner ring of the measured bearing is pressed to the sealing ring, the inner ring of the measured bearing is driven to rotate by means of the rotating friction force of the sealing ring, the dragging friction force between the sealing ring and the measured bearing can be greatly increased by the sealing ring, and then the measurement of a large-torque bearing vibration signal is realized; and meanwhile, rigid contact between the inner ring of the measured bearing and the shaft shoulder of the shaft body is avoided, and the influence of the main shaft system on the vibration measurement resul