Piston rod and disc spring set oil cylinder

The invention relates to the technical field of oil cylinders, in particular to a piston rod, a disc spring set oil cylinder and a piston rod, the rear end of the piston rod is provided with a small piston rod cavity and a small piston cavity which are not communicated, and a disc spring set is arranged in the small piston rod cavity. Through the arrangement of the disc spring set, when the oil cylinder is in a clamping state for a long time, liquid of the oil cylinder leaks or working pressure cannot be kept, the disc spring set can release certain acting force to force the piston rod to stretch out, and the whole oil cylinder continues to keep clamping force on a workpiece; safety accidents caused by falling of the workpiece due to the fact that the oil cylinder liquid leaks or the working pressure cannot be maintained and the whole oil cylinder cannot continuously maintain the clamping force on the workpiece are effectively prevented. 本发明涉及油缸的技术领域，尤其是一种活塞杆及碟簧组油缸，活塞杆，所述的活塞杆的后端设有不连通的小活塞杆腔和小活塞腔，所述的小活塞杆腔内设置有碟簧