The working principle of the quick coupling is to insert the hose into the quick coupling, and then use the nut to lock the hose, cutting into the pipe to achieve sealing. It does not require welding when connecting with the hose, which is beneficial for fire prevention, explosion prevention, and high-altitude operations, and can eliminate the drawbacks caused by improper welding. Therefore, it is a relatively advanced connection component used in the pipeline of self-control devices in systems such as oil refining, chemical industry, petroleum, natural gas, food, pharmaceuticals, and instrumentation.