Fixture block composite structure for workpiece positioning

A fixture block composite structure for workpiece positioning comprising:

• a fixture block group including at least a stop fixture block and at least a one-sided movable fixture block,
• wherein the stop fixture block is fixed to a base by a plurality of side clamping pieces, and two opposite lateral sides of the stop fixture block in the extending direction of base are provided with a fixed upright positioning plane respectively;
• the one-sided movable fixture block has a holder, the holder is fixed to the base by a plurality of side clamping pieces;
• the holder is provided with a movable piece which can be driven to reciprocate towards one of the positioning planes;
• one side of the movable piece facing the stop fixture block is provided with a clamping surface;
• the clamping surface can change the distance to one of the positioning planes by reciprocating with the movable piece, so as to clamp or loosen a workpiece located between the positioning plane and movable piece;
• wherein the one-sided movable fixture block is a one-sided translational fixture block with one movable piece, the one-sided translational fixture block is provided with a top surface in the upper part of the holder;
• a stopping part protrudes from a lateral side of the top surface;
• the movable piece is located on one side far from the stopping part on the top surface;
• a driving piece is located between the movable piece and stopping part;
• the driving piece has a big-end-up trapezoidal section, and one side facing the movable piece and stopping part is provided with a driving bevel face and a guide slideway respectively;
• the stopping part is provided with a stopping bevel face adhering to the guide slideway;
• there is at least one elastic element between the driving piece and the top surface of holder;
• the movable piece is provided with an interlocked bevel face adhering to the driving bevel face;
• a downwards through fisheye long hole is located in the center of top side of the driving piece, and a driving bolt is screwed in the top surface of the holder through the fisheye long hole, the driving bolt is turned to press down the driving piece, so as to form a push between the stopping part and movable piece, the movable piece can be translated away from the stopping part;
• when the driving bolt is loosened, the driving piece can be pushed up to the home position by the elasticity of the elastic element.