Automatic centering clamping device

The utility model relates to an automatic centering clamping device. An electric motor is engaged with a gear through a worm gear speed reducer, the gear rotates to drag a rack to do the reciprocating motion, a clamping force controller is adopted for regulation, and the rack is fixed on slide blocks arranged at both ends. When arranged on an H-shaped steel automatic assembling machine requiring the automatic centering clamping, the automatic centering clamping device can be used for assembling H-shaped steel and T-shaped steel. When arranged on an H-shaped steel numerical control three-dimensional drilling machine, the automatic centering clamping device can be used for automatically centering and drilling connecting holes of three surfaces of the H-shaped steel. When arranged on a numerical control plane drilling machine, the automatic centering clamping device is used for automatically centering and drilling holes on flat plates, and the zero point positioning of a numerical control machine tool can be realized, and the processing quality can be ensured, and the production efficiency can be improved by several times.