Over-rotation prevention method and structure for turnover type hydraulic supporting leg

The invention discloses an over-rotation prevention method and structure for a turnover type hydraulic supporting leg. By means of the method and the structure, the hydraulic supporting leg can be manually overturned to be limited to two limiting positions, and the stress state of the root of a hydraulic pipeline of the supporting leg can be improved. When the hydraulic supporting leg is turned over to the upper limit position, the limiting check block on the hand straining beam makes contact with the limiting plate on the end face of the hydraulic supporting leg rotating shaft, and the hydraulic supporting leg is limited to continue rotating. When the hydraulic supporting leg is reversely overturned to the lower limiting position, the other limiting stop block on the hand pulling beam makes contact with the limiting plate on the end face of the hydraulic supporting leg rotating shaft, and continuous rotation of the hydraulic supporting leg is limited. In the process that the hydraulic supporting leg is pulle