What are the anti-loosening methods for the connection between the piston and the piston rod?

The structure of the piston and piston rod mainly includes the connection structure between the piston and the piston rod, the connection structure at the end of the piston rod, the sealing structure between the piston and the piston rod and the cylinder, etc.
The connecting structure of the piston and the piston rod. The connection structure between the piston and the piston rod can be divided into integral type and assembled type, and the assembled type has threaded connection, half-ring connection, snap ring connection and taper pin connection and other types. Under normal working conditions of the hydraulic cylinder, the piston and the piston rod are connected by threads. However, when the working pressure is high or the load is large, and the diameter of the piston rod is small, the thread of the piston rod may be overloaded. In addition, when the vibration of the working machine is large, the nut fixing the piston may vibrate, so a non-threaded connection is required.
The main structure and end connection structure of the piston rod. The main structure of the piston rod has two types: solid and hollow. The solid piston rod is used when the diameter of the rod is small. When the diameter of the rod is large, the piston rod is made hollow in order to reduce the weight. There is an air hole at one end of the hollow piston rod to discharge hot air during welding and heat treatment.
The connection structure between the end of the piston rod and the working machine depends on different usage requirements. There are mainly the following forms: welded single clevis; integral single clevis; smooth end; double clevis; ball head; external thread connection; internal thread connection.
The material of the piston is usually steel, wear-resistant cast iron, gray iron HT15-33, HT20-40 and aluminum alloy.
The material of the solid piston rod is No. 35 and No. 45 steel, and the material of the hollow piston rod is No. 35 and No. 45 seamless steel pipe.