Why does the automatic door of the hotel automatically open when someone comes?

Automatic doors are generally composed of main controller, induction detector, power motor, door leaf traveling track, door leaf unfolding wheel system, synchronous belt (V belt is used by some manufacturers) and lower guide rail system.

When the induction detector detects someone entering, it sends a pulse signal to the main controller, and the main controller informs the motor to run after judgment. At the same time, it monitors the number of revolutions of the motor, informs the motor to exert force, and enters the slow running at a certain time. After the motor gets a certain running current, it runs forward to transfer power to the synchronous belt, and then the synchronous belt transfers power to the spreader system to open the door leaf. After the door leaf is opened, the controller will make a judgment. If it is necessary to close the door, it will inform the motor to move in the opposite direction and close the door leaf.

Generally, it is infrared sensing. Objects with temperature will emit infrared rays, and people's movements can be recognized by feeling the movement of infrared rays, so they may not be sensitive in winter. @ @ @ @ Xin 'an One Card