As said before, it is possible that it was first designed to stop horses from entering the room, so you can see how safe it is. In reality though, its closed security is only one aspect, the other is that it relieves the pressure of the chimney effect in the building. High-rise buildings can be under tremendous pressure because of the air rushing through the building, and it's basically clear when you imagine the huge air-conditioned winds you feel when you pass a mall with open doors in the summer. The reason for the formation of this wind is simple. The cooler indoor temperature means it has more air density, so the air will flow to the higher temperature. When you switch to heating, it's the same thing, once you turn on, the cold air outside will be squeezed in. This pressure may shorten the life of the building, but not so much that the building will collapse in a short time, just not when there is a fire. You should know just by the name (chimney effect) that it has something to do with fire. I wonder how many other people have seen the kind of stove in the past, if the stove is provided with a chimney, the fire is going to burn more vigorously.
This is because when the fire is on, its heat makes the air rise sharply and exits through the chimney, and the cold air from outside is sucked in, thus providing more oxygen.
The same is true for buildings. If a fire breaks out and the door is left open, it becomes a typical stove and chimney, and the fire spreads rapidly upward. A revolving door can effectively stop this from happening because it will block the air flow. You may be thinking of the Boston nightclub fire we mentioned earlier, but that was actually a problem with the design of the revolving door. Since the revolving door allows multiple people to pass, it is able to ensure a more efficient departure if it does not get stuck. However, I guess the manufacturer also thought that people may be in a hurry when there is a fire, and damage the revolving door, it is said that most revolving doors are now "quick release", and do not worry too much about jamming. Finally, some places in order to enhance the use of revolving doors, designers are also racking their brains, including the side of the flush door to hide (as shown above). Estimates for energy-saving considerations, many buildings and hotels on both sides of the swing doors are also locked swing doors, they are encouraging us to take the revolving door, perhaps we should also develop the habit of taking the revolving door, after all, you can save a lot of energy every time you enter and exit.
Introduction to the drive scheme of automatic revolving door with ring column
Automatic revolving door with ring column is mostly used in special occasions where there are load-bearing columns at the entrances and exits of buildings. And the ring column automatic revolving door also came into being, also solved the entrance and exit with a load-bearing column can not use the revolving door problem. Doorway hundred percent summary of the automatic revolving door drive device can be used in four kinds of programs, the following doorway hundred percent of the editor will lead you to see.
Drive unit solution for automatic revolving door with ring column
As the ring column automatic revolving door around the load-bearing column, so that the middle of the rotation of the ring column automatic revolving door is occupied by the load-bearing column, so as to bring great difficulties to the drive mechanism, the gears or sprockets of the drive mechanism are to be detachable, otherwise it can not be assembled. General ring column automatic revolving door drive mechanism can use the following kinds of programs.
01
Ring column automatic revolving door drive device program of the reduction motor with a small gear and a large gear drive mechanism around the cement column.
This kind of ring column automatic revolving door drive device scheme is smooth running, low noise, reliable work, but the requirements for gear, middle spacing, installation are high, furthermore, because the large gear diameter is too large, the cost is increased, the cost is increased, so this scheme is generally not used. The drive device solution of automatic revolving door with ring pillar uses the drive device of reducer motor with sprocket and chain, and the chain is supported by several sprockets and drives the rotating parts to rotate. Some of the foreign automatic revolving door with speed reducer motor, sprocket and chain have adopted this scheme, that is, the chain is supported by several sprockets and drives the rotating parts to rotate. The advantage is that the chain can change the length at will, the noise is less, and the operation is smooth, but the structure is more complicated due to more sprockets, and the chain is strained to ensure the operation.
02
The drive device of the combination of speed reducer motor, small sprocket and chain frame around the cement column of the automatic revolving door drive device scheme of the ring column.
The speed reducer motor, small sprocket, chain frame around the cement column and chain are used as the driving device of the automatic revolving door of the ring column. The small sprocket and the chain in the chain frame can be internally engaged. To reduce noise, the small sprocket can be made of non-metallic material, and the installation accuracy requirement is low. This kind of drive device is relatively simple in structure, and the processing fee and cost are low. The ring-column automatic revolving door of this scheme mainly consists of the following parts: chain frame, small sprocket, pin, fixed plate of reducer, reducer motor, bracket and shaft of hollow reducer. The drive mechanism of the speed reducer motor and pin-tooth drive of the ring-column automatic revolving door drive device scheme. This scheme is similar to the third scheme introduced to you by Mendo Baifenbai above, this scheme can be external or internal meshing, the gear tooth profile curve in turn are external cycloid, circumferential cycloid and involute. When used, the gear is often used as the main wheel; when the pin wheel is used as the main wheel, the top of the gear teeth will first enter the mesh and reduce the transmission efficiency, so this scheme is less used in practice.
