All know how handy automatic doors, especially when my hands are full with packages or bags at the exit of the supermarket.
The drive of the swinging door in its design resembles a large door closer equipped with an electric motor. Being installed above the door from the inside of the room, the swinging drive with the help of lever rods of various shapes opens the usual swing door to the outside or inside.
Its advantage is relatively low cost (it is cheaper than the sliding door drive), a disadvantage is its low intensity, since the swing door experiences more loads when moving, than the sliding door. In Europe, swing automation has been most prevalent in Scandinavia with its cool climate (a swinging door is better than a sliding door is sealed around the perimeter), the presence of many small but expensive shops and a high level of care for people with disabilities.
In the case if the sliding automatic doors are absolutely impossible to install, efficiently using the automatic split-up system will allow the separation of the input and output. In this case, the direction of swinging should always be away from the visitor. This eliminates the impact of people with doors and as a result - injuries and malfunctions of the automation.
The quality drive of an automatic glass door has the following characteristics:
- the speed of opening the two valves are of the order of 1.5 m/s
- the maximum total weight of the valves is 200-250 kg;
- resource of the gearmotor is at least 2-3 million openings.
All drives of automatic doors are equipped with a standard set of accessories. It includes motion sensors, electromechanical lock, safety photo cells, emergency batteries and a mode selector (sometimes combining the function of the programmer).
Motion detectors the most important accessory. They lead the automation in motion at the approach of a visitor. From the quality of their work, noise immunity, range depends largely on the efficacy of automatic doors.
Modern motion detectors are of two types: infrared and microwave. At the same time, all of them act on an active principle - they emit a signal and take it reflected from surrounding objects (the principle of the radar's action). Only such detectors can be installed at the entrance from the street, because they do not react to snow, rain, drafts and sunlight.
Infrared sensor has a wide detection area and high sensitivity. It is advisable to install it when visitors approach the doors from the side. Also useful property of the infrared sensor is the ability to specify the shape of the detection zone based on the geometry of the passage. Infrared sensors work better at high (up to 3 m) aisles.
The following accessories for automatic doors the photocells safety. This is a pair consisting of an infrared transmitter and a receiver that are mounted to the left and right of the doorway. If there is a person in it, the infrared beam between the receiver and the transmitter does not pass and the automatic drive will not close the shutters until the beam is restored. Such a device is mandatory for installation in accordance with safety requirements. It has a double benefit: the sliding door will not hit the jaunty visitor, and the visitor clamped by the doors will not cause, in trying to free themselves, the skewing of the doors and the associated repairs.
Electro magnetic lock for automatic doors Is a special device mounted inside the drive housing and different in appearance from conventional locks. It is designed for very intensive work and is a special bolt form, moved up by an electromagnet before each opening of the automatic door and releasing the carriage wings. Once the flaps are closed again, the bolt falls down under the action of a return spring. In the non-working time, when the sensors of the automatic door are disabled, the lock reliably blocks the doors, excluding the possibility to extend them from the outside with their hands.
In extreme situations, when automation is off and you want to leave the room, pushing aside the sash manually, the lock is easy to unlock from the inside with a special lever mounted on the wall next to the door.
Battery - a rather important element of security. They allow the drive to continue operation for at least an hour when the power is cut off (in the event of an accident). When the charge of the batteries runs out, the control unit will detect this and perform a pre-programmed action - leave the door open or closed and stop working. The additional benefit of the battery is that it compensates for temporary voltage drops.
Mode selector works Is a pushbutton or rotary switch, which sets the drive to one of the following algorithms:
- normal mode — both sensor, automatic doors open the full width of passage for both incoming and outgoing
- simplex — active sensor on one side only, usually on the way out
- winter mode — the automatic door is not fully open, limiting the inflow of cold air into the room
- open door — actuator does not respond to the signals of motion detectors, automatic door is always open
- closed door — actuator does not respond to the signals of the motion detectors, but allows you to open the automatic door button installed, for example, in the security room.
There are models of selectors equipped with a liquid crystal display. They also allow you to set parameters such as the speed of the wings, the pause time between the open state and the start of closing, and so on. but security officers (in most cases, they use the selector), often do not have the necessary skills (and even special desire) to change this kind of settings. They are produced by the personnel of the company servicing the automation, with the help of numerous regulators of the control unit located inside the drive housing.