What is the principle that escalators only start when people taken?

Due to the lack of energy and power resources, the operation of escalators under no-load condition has become a huge waste. Therefore, we envisage that if the escalator can be automatically detected to be empty for a period of time, the escalator will be instructed to slow down from full speed to half speed. In the relatively infrequent places where people come in and out, based on the above ideas, after the escalator detects the no-load status for a period of time, it will slow down gradually from full speed to stop operation, so as to save about 30% ~ 50% of electricity. When a passenger steps on the bed cover of an escalator, the escalator can start running at full speed by automatically sensing the arrival of the passenger through a photoelectric sensor set at the entrance of the escalator cover.

What is the principle that escalators only start when people taken?

What is the principle that escalators only start when people taken?

Working principle:

 

  1. The core parts of the escalator are two chains, which rotate around two pairs of gears. At the top of the escalator, an electric motor drives the transmission gear to rotate the chain ring. A typical escalator USES a 100 horsepower engine to turn the gears. The engine and chain systems are mounted in trusses, which are metal structures that extend from floor to floor.
  2. Unlike the conveyor belt moving a plane, the chain ring moves a set of steps. The most interesting thing about escalators is the way they move. The steps remain level as the chain moves. At the top and bottom of the escalator, the steps fold into a platform. This makes it easier to get up and down the escalator.
  3. Each step of the escalator has two sets of wheels, which rotate along two separate tracks. The top gear (wheels near the top of the steps) is connected to a rotating chain and is pulled by a drive gear located at the top of the escalator. The other wheels simply slide along the track behind the first wheels.
  4. 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 in a horizontal position, flattening the steps. There are a series of grooves inside each step to connect the front and rear steps during the leveling process.
  5. Besides rotating the main link, the motor in the escalator can also move the handrails. The armrest is just a rubber conveyor belt that circulates around a series of wheels. The conveyor belt is precisely configured to move at exactly the same speed as the steps, making the rider feel smooth.
  6. The escalator system is not capable of lifting people up dozens of floors as elevators do, but it is suitable for providing short distance transportation. This is because of the high load rate of escalators. When the elevator is full, no one else can get on until it reaches the designated floor and returns. On escalators, as long as one person reaches the top, it makes room for others.

How to replace escalator step chain and chain wheel?

The replacement of the escalator step chain is a complicated work. but it is also the main part of the overhaul and is one of the few complicated technical tasks. First of all, put the escalator on the maintenance, use the maintenance switch to control the operation of the escalator up and down, so that turn the bottom pit to remove all the steps. The process takes about one day for two people. Fixed one day after removing the steps. Prepare the tools needed to remove the large chain of steps, and meanwhile, prepare the new step chain and the big chain breaking from the back-end removed to the outside of the escalator large frame, a new escalator large chain from the back-end installation, you need to use the guide chain after idling around big chain to make it work on constant track route. Such a good step after adjusting both sides of the rear end of the tightening spring screw can be declared completed. Here must reminder our customer that the escalator chain wheel of the step cannot be replaced individually but must replace the whole set step chain. Because of the left and right chains need to be matched, so we need to replacement for both sides together.

How to replace escalator step chain and chain wheel

How to replace escalator step chain and chain wheel?

Replacement steps as following:

  1. Determine the number of step sprocket to be replaced, preferably in accordance with the whole chain
  2. Remove the inner and outer cover and apron board of the left and right straight-line section of the lower end, about 6 meters in length.
  3. The steps on the chain need to be replaced for removal.
  4. Move part of the chain that needs to be replaced to the position of removing the inside and outside cover plate and apron plate.
  5. Loosen the lower end of the ladder chain and tighten it.
  6. Use special components (or wire) to fix chains that do not need to be removed.
  7. Remove and replace the escalator step chain.
  8. Tighten the cascade chain after replacement.
  9. Install the steps and correct them.
  10. Install other removal parts.
  11. Test run