Hydraulic clamp for vertical machining of curved surface handle type workpiece

A hydraulic clamp for vertical machining of curved-surface handle type workpieces can clamp workpieces in multiple directions, is stable in clamping, meets the requirement for precision of the workpieces, improves machining quality and machining efficiency and meets the requirement for mass production. The fixture comprises a bottom plate, a positioning mechanism and a clamping mechanism are mounted on the bottom plate, and the fixture is characterized in that the positioning mechanism comprises a large base and a torsion spring base, a small base and a supporting pin are mounted on the large base, two lateral positioning pins are mounted on the lateral portion of the small base in the length direction, and the torsion spring base is mounted on the two lateral positioning pins. A lateral positioning pin is mounted on one short edge side of the small base, and a torsional spring top plate is rotatably mounted on the torsional spring base through a pin shaft; the clamping mechanism comprises an oil cylinder and