When it is installed, the track only needs to be fixed on the door beam. The length of the track can be cut according to the size of the door hole. The non-contact automatic door machine has a very small driving force design. When the user blocks the door body from closing, the door body will turn back by itself, and, like Potongmun, it can be switched on and off with ease. At the same time can be arbitrary combination, suitable for different structural size of all types of doors。