what is the automatic door system?

Automatic doors Systems on the building began to be used in the later years of the twentieth century.
The late 1920s, the U.S. supermarket opening automatic doors began to be used, affected the
world's first brand DORMA automatic doors in 1945, developed a hydraulic, air automatic doors,
 the new main entrance of the building began to use. To the 1962 electrical-style has begun
 to appear, along with the city after the construction of automatic doors technology field is increasing every year.
At first, the supply of buildings with a power supply with motor speed control is difficult, and can only hydraulic,
pneumatic speed control, but the energy conversion efficiency is very low, but along with the technical development of
electrical control, electrical control technology has now matured , direct control automatic door motor electrical
gradually become mainstream. For example: all kinds of automatic control with identifiable special doors,
such as: automatic door sensor (infrared sensor, microwave sensor, touch sensors, foot sensors),
credit card automatic doors. The use of pedals, effects such as optical beam to power, pneumatic or hydraulic-powered
automatic doors open and close the system. 1st century AD, Greek Hero automatically open the temple's construction of
the device (Figure 1) was the first use of pneumatic and hydraulic-powered automatic doors. As shown,
the altar fire to an expansion of the air, water flows into two, using the weight of the water rotating
shaft 3, open the door. Altar fire, the door automatically closed. Modern automatic door operation,
there are three main ways (Figure 2).
① foot plate: equipped with a pressure switch under the pedal.
② optical beam type: near the door of the optical beam transmitter and sensing devices.
③ button way: by hand to make a similar switch the button to open doors. Automatic doors to sliding,
hinged or folding doors open and close, etc.. For security, must be equipped with special equipment,
such as family needs with the installation of automatic doors come on the identification device or TV monitor,
etc., persons outside the family strictly limited. Automatic doors in shopping malls, hotels, restaurants,
airports, railway stations, banks and other occasions, has been widely used. Automatically open and close
 by a variety of signal control, and have run the unit, sensors and door components in general.