What is the working principle of automatic doors?

Automatic door is a kind of door, which makes the door more convenient for people through the power system. Automatic doors are generally the choice of shopping malls, hotels, supermarkets, banks and so on. And there is no demand for automatic doors in general communities or families. When a person approaches the automatic door, the system of the automatic door will feel that it will automatically close when the person leaves by opening the door through the driving system. There are many kinds of automatic doors, such as revolving doors and sliding doors. The following small series will introduce the working principle of automatic doors for everyone.

principle of operation

The basic working principle of automatic door The basic composition of automatic door machine is basically the same. Using the above composition and door opening signal, a simple automatic door system can be configured.

The system configuration of automatic door refers to the peripheral auxiliary control devices connected with the automatic door controller according to the use requirements, such as door opening signal source, access control system, safety device, centralized control, etc. Must be based on the characteristics of the use of buildings. According to the personnel composition and the system requirements of building automation, auxiliary control devices are reasonably equipped.

open

There are three kinds of electronic locks for automatic sliding doors: electromagnetic locks for locking belts, electric locks for locking doors and cranes, and locking motors. The latter is used for heavy automatic sliding doors. Electronic locks of automatic sliding doors include electromagnetic door stopper, electronic latch and electronic door opener. The direction of the force of electronic door opening does not affect the opening action of the door, and misoperation is not easy to occur. There is also a mechanical lock with a contact switch, which combines the lock and the switch into one. When the lock is not in the unlocked state, the contacts can't be touched, and it is impossible to misoperate.

Control centralization

The concept of centralized control includes two meanings: centralized monitoring of the running state of automatic doors and centralized operation of multiple automatic doors. The position signal output circuit can realize centralized monitoring of automatic door switch state, and contact switch can be used. When the door reaches a certain position (such as the open position), the switch is triggered to give a contact signal. When the sensor detects that the door is in a certain position, the induction signal generator can also be used to send a signal. The status of automatic doors can be displayed by setting corresponding indicator lights in the central control room, while centralized operation usually means opening or locking multiple doors at the same time.

Open door signal

The opening signal of automatic door is contact signal, and microwave radar and infrared sensor are two common signal sources:

Microwave radar responds to the displacement of objects, so it has a fast response speed and is suitable for places where people with normal walking speed pass by. Its characteristic is that once people close to the door don't want to go out and don't move, the radar will no longer respond, and the automatic door will close, which has a certain protective effect on the door machine.

Infrared sensors react to the presence of objects. No matter whether people move or not, as long as they are within the scanning range of the sensor, it will respond and send out contact signals. The disadvantage is that the infrared sensor has a slow response speed and is suitable for places where people move slowly.

In addition, if the automatic door receives the contact signal for too long, the controller will think that there is an obstacle in the signal input system. Moreover, if the automatic sliding door remains open for too long, it will also cause damage to electrical components. Because microwave radar and infrared sensors don't know whether people close to automatic doors really want to enter the door, they prefer to use key switches in some occasions.

The key switch can be a contact button, and it is more convenient to use the so-called elbow switch. The toggle switch is durable, especially it can be operated by elbow. Avoid hand contact.

There is also a kind of foot switch, which has the same function, but has higher waterproof requirements, and the foot switch is prone to failure because of its great strength. There is also a handle with a contact switch, which will provide a contact signal to the portal crane when the handle is pushed into position (or pulled in the opposite direction).

Building automation sometimes puts forward special requirements, such as using a branch line of the telephone to control the door opening. To achieve this requirement, as long as the signal is a passive contact signal. In some cases, people will ask for antenna remote control. The requirements can be met by using the wireless receiver to contact with the automatic door and using the wireless transmitter.

In the above article, we comprehensively introduced the working principle of automatic doors. The use of automatic doors greatly reduces people's physical consumption and improves people's travel efficiency. From the above, we know that the automatic door is composed of the door itself, the driving system and the sensing part. With the continuous development of automatic doors, their appearance and intrinsic performance will be improved continuously, which will be more harmonious with the building and even become a bright spot in architectural design, making the building more beautiful.

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