What is the use of the sling?

The sling wheel is used for the transfer door of the balcony, kitchen, and restaurant. It is an important part of the transfer door. It actually plays a buffer closing role. It hangs the door fan, carries the weight of the door on the wheel, and cooperates with the suspension track. Make the door move easily. [ 1] Grounds are divided according to the type of moving door, including wooden doors, glass doors, and folding doors. According to functions, there are luxury wheels, ultra-silent wheels, dust wheels, etc..