I. Friction locking (1) Spring washer locking: The spring washer is made of spring steel. After assembly, the washer is flattened, and its resilience can maintain the compression force and friction between threads, thus realizing anti-loosening. What are the methods of thread locking? ② Locking of the top nut (double nut): Through the action of the top nut, the bolt type is subjected to extra tension and extra friction. Because more than one nut is used, it is not reliable and is rarely used at present. ③ Locking of self-locking nut: after one end of the nut is slotted, it is made into a non-circular or radial necking. When the nut is tightened, the closure expands and the thread is pressed by the elastic force of the closure. This locking structure is simple and reliable, and can be disassembled and assembled many times without reducing the locking performance. What are the methods of thread locking? ④ Locking of elastic ring nut: fiber or nylon is embedded in the metal wire to increase friction. The elastic ring also plays a role in preventing liquid leakage. What are the methods of thread locking? Second, mechanical locking ① After locking the groove nut and the groove nut of the cotter pin are tightened, use the cotter pin to pass through the small hole at the tail of the bolt and the groove of the nut, or use the common nut to tighten the drill pin hole. What are the methods of thread locking? ② Round nut and stop washer Insert the inner tongue of the washer into the groove of the bolt (shaft). After tightening the nut, insert the outer tongue of the washer into the groove of the nut. What are the methods of thread locking? ③ After locking the washer nut, bend the single-ear or double-ear locking washer and stick it on the side of the nut and the connecting part respectively to realize locking. If two bolts need double interlocking, a double stop washer can be used. What are the methods of thread locking? (4) Locking of series steel wires uses low-carbon steel wires to pass through the holes on each screw head, and the screws are connected in series to brake each other. This structure needs to pay attention to the direction in which the steel wire penetrates. The principle is that when a bolt tends to loosen, the steel wire should be pulled to make the adjacent bolt tend to tighten. See the figure below: What are the methods of thread locking? Three, permanent locking (1) punching edge sealing method, to prevent loosening. After the nut is tightened, the thread is damaged at the end of the thread. ② Bonding and locking Usually, anaerobic adhesive is coated on the thread surface. After the nut is tightened, the adhesive can self-cure and the locking effect is good.