Pneumatic quick-change device

The utility model discloses a pneumatic quick change device, which is used for realizing automatic change of a clamp and comprises a body part with a piston cavity and a piston shaft arranged in the piston cavity and capable of axially moving in the piston cavity. The bottom of the piston cavity is provided with a guide groove which is of a non-circular structure and provided with a second inclined face. The face, opposite to the guide groove, of the piston shaft is provided with a guide boss matched with the guide groove. When the piston shaft moves towards the bottom of the piston cavity, the second inclined face guides the guide boss to be matched with the guide groove to achieve alignment of the piston shaft. By means of the device, the piston shaft can automatically reset every time the piston shaft moves, and the situation that a tool clamp cannot be smoothly exchanged is avoided. 本实用新型公开了一种气动快换装置，所述快换装置用于实现对夹具的自动更换，所述快换装置包括具有活塞腔的本体部和设置在所述活塞腔内并可在所述活塞腔内轴向移动的活塞轴；所述活塞腔的底部设有非圆形结构的且具有第二斜面的导向沟槽，所述活塞轴与所述导向沟槽相对