The hanging wheel is used for sliding doors in balconies, kitchens and dining rooms. It is an important part of sliding doors. In fact, it plays the role of buffering and closing. It suspends the door fan, carries the weight of the door on the wheel, and cooperates tacitly with the hanging rail so that the door can be easily moved. The hanging wheel is distinguished by the category of sliding doors, including wooden door hanging wheel, glass door hanging wheel and folding door hanging wheel, etc.