Clamping type pile driver gripping mechanism

A clamping type press-in pile driver clamping mechanism comprises at least two clamping oil cylinders, a pile-driving upper beam, a pile-driving lower beam, a square/tubular pile front plate, a connecting hinge, and a clamping plate, and is characterized in that the connecting hinge comprises at least two straight hinges (4) and two bent hinges (6); one end of the clamping oil cylinder is hinged with the straight hinges (4), the other end of the clamping oil cylinder is hinged with the bend hinges (6), the other ends of the straight hinges (4) and bent hinges (6) are hinged via pivot shafts (8); the clamping oil cylinder, the straight hinges and the bent hinges are hinged with one another to form a closed ring. The utility model is used in the platform of full hydraulic static press-in pile driver, adopts a plurality of high performance oil cylinder to clamp the pile in surrounding manner, and can effectively prevent pile broken and slipping phenomena. The utility model has the advantages of advanced mechanical structure, large contract surface area, large pile clamping force, uniform and reasonable stress, and low partial counterforce to structure. For the pile-sinking construction above 500 tons, the technical advantages are more remarkable. When converting the square/tubular pile clamping, the clamping assembly is not needed to be replaced, and only the front clamping plate is replaced.