Paw structure and grabbing method for automatic grabbing of engine shell

The invention relates to a paw structure and a grabbing method for automatic grabbing of an engine shell. A paw head is hinged to the head of a paw head base through a pin shaft, the paw head base is fixedly mounted at the tail end of a sliding sleeve, a piston rod is mounted in the sliding sleeve in a sliding fit manner, the top end of the piston rod is matched with an oil cylinder base, the oil cylinder base is fixed to the upper end face of a bottom plate, a first oil inlet is machined in the bottom end of the oil cylinder base, an oil cylinder cover is mounted on the top of the oil cylinder base, and a second oil inlet is machined in the top of the oil cylinder cover; a top plate is mounted on the top of the bottom plate through a plurality of sets of supporting rib plates, a flange plate is fixedly mounted on the top plate, and a buffer positioning device is further mounted on the bottom plate; the grabbing structure achieves automatic grabbing and automatic feeding and discharging functions through a de