Elevator traction system

Traction-driven elevator is an elevator that lifts by the frictional force of the drive wheel groove and wire rope of the host, for the traction-driven passenger elevator we ride, all belong to this kind. The traction system is composed of traction sheave, wire rope, guide sheave, reverse rope sheave, etc., which is used to output and transmit power to drive the elevator operation, and this is the main difference between traction drive and forced drive.

The principle of traction drive is: one side of the wire rope is connected to the car, and the other side is connected to the counterweight through the guide wheel. At this time, if you want the car to go up, the traction wheel must turn in the direction of the car moving upward, so that the car can be lifted by the friction between the traction wheel and the wire rope. Most of the elevators we ride everyday belong to this category.

The main advantages of traction drive are

1、Safety and reliability. Take the common topping event of elevator as an example, the traction-driven elevator adopts the principle of friction between the traction wheel and the wire rope, when the extreme situation occurs, the slippage of the wire rope of the traction wheel can be used to avoid accidents.
2、Large lifting height. Take hydraulic drive elevator as an example, its lifting height is very limited, because it is relying on hydraulic device to elevator the elevator up, if the height is very high, it will inevitably put forward higher requirements for hydraulic lifting bar. The traction drive does not have this disadvantage, also because of its working principle, the lifting height of 10 meters and 50 meters in addition to the length of the wire rope weight no essential difference, which also determines the lifting height of the traction drive is greater than other types of elevators.
3、It can use high speed motor. One of the decisive factors in the development of elevator is the innovation of high speed motor, other types of elevators due to various conditions, the operating speed is not very high, while the speed of traction-driven elevator can reach 20M/S, even if we often ride, it can reach 1.75M/S or even more.