Fast changing mechanism for loader

The utility model belongs to a mechanism of a loading machine, which relates to a fast-change mechanism of working machine tools of a loading machine. In the fast-change mechanism of working tools of a loading machine, a bracket steel tube is respectively, orderly and fixedly connected with side plates which are parallel to a fast-change bracket side by side. Fast-change plugs and connecting rods of a lever mechanism are hinged through a connecting bolt. A bidirectional hydraulic cylinder, connecting rods on both sides and the fast-change bracket are all fixed and hinged by pin shafts. Plug holes are arranged on the side plates of both sides of the fast-change bracket and the plug holes and the fast-change plugs are movably matched and assembled. When used, different working machine tools which need being changed are hung on the bracket steel pipe of the fast-change bracket through hooks of the machine tools. The bidirectional hydraulic cylinder is operated, which prompts the connecting rods to drive the fast-change plugs, and the fast-change plugs are disengaged from or inserted in the plug holes, and thus the working machine tools can be disengaged or connected into a whole with the fast-change bracket. Due to the adoption of the schemes, the utility model has the advantages of labour intensity reduction, work production efficiency improvement, equipment utilization improvement and cost saving.