The invention belongs to the technical field of fluid
braking equipment, and particularly relates to a safety limiting device for a pull
rope oil cylinder, which comprises a
fixed frame, a sliding base and a hydraulic oil cylinder, the device further comprises a stable transmission mechanism. On one hand, in the stretching and retracting process of the hydraulic oil cylinder, the sliding base is driven to move in the mode that the fixed
pulley pushes the transmission steel cable, and in the moving process, due to the fact that the fixed
pulley and the transmission steel cable are symmetrically distributed on the upper side and the lower side of the hydraulic oil cylinder, tension of the transmission steel cable on a connecting piece is more balanced; on the other hand, due to the arrangement of the fixed
pulley and the sliding base, under the condition that the
stroke of the sliding base is fixed, the
stroke of the hydraulic oil cylinder is halved, the requirement for the rigidity of the hydraulic oil cylinder is lowered, and the bending probability of the hydraulic oil cylinder is lowered; the stability of the hydraulic oil cylinder for driving the sliding base to move is further enhanced.