Screw rod follow-up supporting mechanism of hoisting device

The utility model relates to a safety mechanism of an oil cylinder or other mightness hoisting device, in particular to a screw-rod follow-up supporting mechanism of a jacking oil cylinder hoisting device, which is characterized in that a base is provided with an overloading screw rod, and a bearing round nut is installed on the overloading screw rod, and a bearing is arranged between the bearing round nut and the base, and a spring is arranged below the bearing, and an output shaft of a servo motor is connected with the bearing round nut, and the outer side of the bearing round nut is made into a gear, and a micrometer is mounted on the base, and the micrometer is connected with an electronic amplifier through a conducting wire. The output shaft of the servo motor is provided with a gear which is engaged with the gear on the outer side of the bearing round nut. A gap is arranged between the bearing round nut and the base. The screw-rod follow-up supporting mechanism has simple, compact and reasonable structure, and can effectively support the overloading work piece when the oil pressure of the oil cylinder disappears; the follow-up supporting screw rod can be self-locked to be maintained, thereby preventing the falling of the overloading, thereby ensuring the jacking safety of the overloading work piece.