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The core components of an escalator are two chains, which revolve around two pairs of gears. At the top of the escalator, there is an electric motor drive the drive gear to turn the chain. A typical escalator USES a 100-horsepower engine to turn gears. Both the engine and the chain are mounted in trusses, which are the metal structures that extend between the two floors.
Unlike the conveyor belt, which moves a plane, the chain moves along a set of steps. The most interesting thing about escalators is the way these steps move. When the chain moves, the steps remain horizontal. At the top and bottom of the escalator, the steps are folded to form a platform. This makes it easier to go up and down escalators.
Each step on the escalator has two sets of wheels, which move along two separate orbits. The upper unit (the wheel near the top of the steps) is connected to the rotating chain and driven by the driving gear at the top of the escalator. Other groups of wheels just slide along the track, following the first set of wheels.
The two tracks are separated from each other so that each step can be kept level. At the top and bottom of the escalator, the track is at a horizontal position, which makes the steps flatten out. There are a series of grooves inside each step so that they can be connected to the front and rear steps in the process of flattening.
In addition to turning the main link, the motor in the escalator moves the handrail. The handrail is just a rubber conveyor belt around a series of wheels. The conveyor belt is precisely configured so that it can move at exactly the same speed as the steps and make the user feel smooth.
The escalator system does not lift people up dozens of floors like elevators, but it is ideal for short distances. This is because of the high load rate of escalators. After the elevator is full, it must wait until it reaches the designated floor and returns to the elevator. And on escalators, as long as one person reaches the top, they make room for others.