How to tighten a small nut has always been a long-lasting topic in mechanical design. Everyone knows it better, such as Japanese eccentric nut, Down nut and Chinese self-tightening king nut. But today we will not talk about these stars in the fastener industry. Let's talk about the most basic method of fixing nuts in work.
1, leveling washer
A washer refers to a part which is cushioned between a connected member and a nut. Generally a flat metal ring is used to protect the surface of the connected member from being scratched by the nut, and to disperse the pressure of the nut on the connected member.
2. Flat washer and spring washer
Spring washers are widely used in the load-bearing and non-load-bearing structures of general mechanical products. They are characterized by low cost and easy installation, and are suitable for frequently assembled parts. But the spring washer's ability to prevent loosening is very low!
3.Self-locking nut
The ordinary nut will loosen due to other reasons such as vibration during use. In order to prevent this phenomenon, a self-locking nut was invented. The function of self-locking nut is mainly to prevent loosening and vibration. For special occasions. Its working principle is generally self-locking by friction. Types of self-locking nuts classified by function are nylon-embedded, neck-necked, and metal anti-loosening device. They are all effective torque type lock nuts.
Due to its nature, self-locking nuts are difficult to screw.
4. Nut lock fluid
Apply the nut anti-loosening liquid to the tightening place of the bolt, and then screw on the nut to achieve the effect of anti-loosening.
5. Double nuts (left and right) to prevent loosening
It is also a good method to tighten and prevent loosening through the cooperation of a left-hand nut and a right-hand nut.