Hinge, also known as hinge, is a mechanical device used to connect two solid bodies and allow relative rotation between them. The hinge may be composed of a movable component, or may be composed of a foldable material. The hinges are mainly installed on doors and windows, while the hinges are more installed on cabinet furniture. According to the material classification, they are mainly divided into stainless steel hinges and iron hinges. In order to let people enjoy better, hydraulic hinges (damping hinges) have appeared. Its characteristic is to bring a buffer function when the cabinet door is closed, which minimizes the noise caused by collision with the cabinet body when the cabinet door is closed.