The current lunch box machine is mainly used to produce disposable plastic fast food boxes, and as a kind of more used products in the current urban catering industry, we actually use it in many times. Most of the current takeaways use this kind of fast food box for packaging, whether it is a snack box in the form of a foam or a hard plastic box, which is now more common. When it comes to such fast food boxes, it is mainly processed and manufactured using a lunch box machine. When it comes to the production of lunch box machines, the auxiliary devices play an important role. The internal coupling is one of them. Introduce this coupling device.
         The couplings that are adjusted to the lunch box are divided into two categories: the first one is rigid, and the coupling transmits the shock that may occur in the transmission when transmitting torque from one part to the other; the second is Rao Sexually, this type of coupling relieves the shock when transmitting torque. The clutch represents an individual form of the coupling that allows the shaft to be separated or coupled without disassembly during its operation. These types of clutches are classified into two types: toothed and frictional. In some cases, it is necessary to use a safety coupling when transmitting torque that does not exceed the specified value, or to construct a friction coupling or a fixed coupling.