When taking escalators in daily life, especially in subway, airport, railway station and other places, we can see that some people often walk on escalators in order to catch up with time. Although there are voice reminders on the escalators, please hold the handrails well and pay attention to your feet! Such behavior is very dangerous!
According to the requirements of national standards, our armrest belt is 1%-2% faster than the running speed of stairs. Why is there such a national standard?
When riding the escalator, step on the pedal and hold the handrail. Because the speed of the handrail is faster than the step, our hands are always in front of the body. If there is an emergency, the elevator fails to stop the elevator or the emergency stop button of the escalator is manually pressed, the stop of the escalator will not be controlled by the voice changer, and the brake or the brake belt is directly locked, which is what we said emergency brake. At this time, due to inertia, our body will lean forward! At this time, our hands on the handrails play an important supporting role and protect us from injury.
Imagine that when we walk on it and do not hold the handrail, inertia will cause us to be injured, and even serious trampling accidents occur! This behavior is irresponsible to yourself, your family, and others. Ning to be slow for a minute, not to grab a second!
Next, let’s introduce the structure of our handrails!
This is a tension and friction drive device for the handrail:
Usually we can see the handrail with running guide rail:
The lower part of the handrail belt is tensioned, and the middle part is supported:
One measure of the tensivity of the handrail belt is the deflection: the distance between two tugs X is 1200mm or the distance Y that can be pressed between 2400mm is the deflection!
When the deflection is insufficient, adjust to qualified by the upper handrail with tensioning device:
When the driving force of the handrail belt is insufficient, that is, the friction force is insufficient to stop the handrail belt at the upper part, we need to adjust its friction force to be qualified: