Automatic telescopic compressing mechanism with inner hole self-centering function

The invention discloses an automatic telescopic compressing mechanism with the inner hole self-centering function. The automatic telescopic compressing mechanism comprises a power pulling piece, a bridge plate, a pull rod, a taper seat, an oil cylinder seat, an end face positioning block, a pressing plate and more than one pressing claw; the power pulling piece is mounted at one end of the bridgeplate; and the pull rod penetrates through the bridge plate to be connected with the power pulling piece and does pulling action through the power pulling piece. The automatic telescopic compressing mechanism applies an oil cylinder, the pressing claw, an expanding clamp and the like to realize compression and have the clearance eliminating function, is simple in structure, reliable in function and high in manufacturability, enables a manipulator to grab a workpiece in an easier manner, eliminates the clearance of product tolerance and improves the processing precision of a product. 本发明公开了一种具有内孔自定心功能的自动伸缩压紧机构，包括动力抽拉件、