Once the bolt connection in mechanical equipment is lax, it will cause the bolt to fall off and lead to major safety hazards, or the fatigue life of bolt connection will be greatly shortened due to the decrease of bolt slack preload. Therefore, appropriate anti-loosening measures should be selected in the design to ensure that the bolt is not loose in actual use, which is also conducive to the normal operation of the protection equipment and prolong the service life.
1. Double nut locking is also called pair nut locking. When two pair nuts are tightened, there is always interaction pressure between the two pair nuts, and any of the two nuts need to overcome the friction between screw threads to rotate. Even if the external load changes, the pressure between the nut is always there, so it can act as a looser.
2. Self-locking nuts generally rely on friction force. The principle is that the embossed teeth are pressed into the preset hole of the sheet metal. The nut is connected with the locking mechanism. When the nut is tightened, the locking mechanism locks the bolt thread.
3. Thread locking adhesive is a adhesive composed of (methyl) acrylic ester, initiator, promoter, stabilizer (inhibitor), dye and filler according to a certain proportion together.
4. Use cotter pins. After the nut is tightened, insert the cotter pin into the nut slot and the bolt tail hole, and open the tail to prevent the relative rotation of the nut and bolt.
5. Slotted nuts are used together with threaded bolts and cotter pins to prevent the bolt from rotating relative to the nut.
6 series steel wire anti-loosening is to Pierce the steel wire into the hole of the bolt head, and the bolts are connected in series to contain each other. This kind of anti-loosening method is very reliable, but more troublesome to disassemble.
7. Use preload to prevent loosening. High strength bolt connections generally do not require additional anti-loosening measures, because high strength bolts generally require a relatively large preloading force. Such a large preloading force creates a strong pressure between the nut and the connected member. This pressure will produce friction torque that prevents the nut from rotating, so the nut will not loosen.
8. Use a stop gasket. After the nut is tightened, bend the single-ear or double-ear stop washer to the side of the nut and the connector respectively and tighten it to lock the nut. If two bolts need to be double interlocked, a double brake washer can be used to make the two nuts brake each other.
9. Spring washer and double stack self-locking washer can be used for fixing and anti-loosening.
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