The Mechanism of Passenger Elevator II

Date:2016-11-04

In each case, cables are attached to a hitch plate on top of the cab or may be "underslung" below a cab, and then looped over the drive sheave to a counterweight attached to the opposite end of the cables which reduces the amount of power needed to move the cab. The counterweight is located in the hoist-way and rides a separate railway system. As the car goes up, the counterweight goes down, and vice versa.

This action is powered by the passenger machine which is directed by the controller, typically a relay logic or computerized device that directs starting, acceleration, deceleration and stopping of the elevator cab.

The weight of the counterweight is typically equal to the weight of the elevator cab plus 40-50% of the capacity of the elevator. The grooves in the drive sheave are specially designed to prevent the cables from slipping. "passenger" is provided to the ropes by the grip of the grooves in the sheave, thereby the name.

As the ropes age and the passenger grooves wear, some passenger is lost and the ropes must be replaced and the sheave should be repaired or replaced. Nonetheless, sheave and rope wear may be significantly reduced by ensuring that all ropes have equal tension, thus sharing the load evenly. Generally, rope tension equalization may be achieved using a rope tension gauge, which is a simple way to extend the lifetime of the sheaves and ropes.

Elevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cable between the hoist and the cab.

Usually, if the passenger elevator cab is at the top of the hoist-way, there is a short length of hoist cable above the car and a long length of compensating cable below the car and vice versa for the counterweight. If the compensation system uses cables, there will be an additional sheave in the pit below the elevator, to guide the cables. And if the compensation system uses chains, the chain is guided by a bar mounted between the counterweight railway lines.

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