Automatic doors are divided into: revolving doors, curved doors, sliding doors, swing doors, folding doors, fast doors and other types.
Automatic door type examples:
Automatic doors began to be used on the building in the twentieth century. The end of 1920s, as the U.S. supermarket opening, automatic doors began to be used, therefore, the world's first brand DORMA automatic doors in 1945, developed a hydraulic, air pneumatic automatic doors, the main entrance of the new building began to use the automatic doors. In 1962, electric style automatic doors appeared, along with the construction of the city, the automatic door technology is increasing every year. At first, it is difficult to control the motor speed with the power supply of building, can only adopt the hydraulic, air pneumatic speed control, but the energy conversion efficiency is very low, however, along with the technical development of electrical control, electrical control technology has now matured, can control the automatic door electric motor directly that has become mainstream. For example: a variety of automatic control with identifiable special doors, such as: automatic sensor doors (infrared sensors, microwave sensors, touchless sensors, foot sensors), card automatic doors.
Make use of pedal, photoelectric beams and so on, to open and close the automatic doors system with the electric, pneumatic or hydraulic powered.
1st century AD, Greek temple built automatically open the device (Figure 1) was the first use of pneumatic and hydraulic powered automatic doors. As figure 1 shown, the altar to do a fire to make 1 the air expansion, water flows into 2, using the weight of water to make axis 3 rotate, open the door. Altar cut off the fire, the door automatically closed. Modern automatic door operation, there are three main ways (Figure 2).
① Foot pedal type: equipped with a pressure switch under the pedal.
② Photoelectric beam type: Photoelectric beam sensing devices is installed at the both sides of the door with launchers and receivers.
③ Button type: press a similar switch button to open doors by hand.
Automatic doors are opening and closing as per sliding, hinged or folding doors means. For security, must be fitted with special equipment, such as family needs to install TV monitor or other identification devices for personnel outside the family on the automatic doors system. Automatic doors has been widely used in shopping malls, hotels, restaurants, airports, railway stations, banks and other occasions.
Automatic door is the general name including automatically open and close by a variety of signal control, and have running devices, sensors devices and door components.