Electrical manipulator internal gripping device based on gears, racks and crank connection rods

An electrical manipulator internal gripping device based on gears, racks and crank connection rods comprises a screw, wherein a nut matched with the screw is installed on the screw, at least two racks parallel to the screw are arranged on the outer peripheral face of the upper edge of the nut at intervals, a gear meshed with the corresponding rack is arranged on each rack, the crank connection rods are hinged to the gears, and the tail ends of the crank connection rods are connected with gripping press heads. The internal gripping device can be installed on a crane, a production machine and other manipulators to replace dull, repeated or burdensome manual labor and can replace manual operation in hazardous environment, accordingly mechanical and automatic production is achieved, working efficiency is improved, labor conditions are improved, and the personal safety problems caused by fatigue and the like of workers are deceased.