A bi-directional overspeed governor installed on a Kone MonoSpace elevator. An overspeed governor is an elevator device which acts as a stopping mechanism in case the elevator runs beyond its rated speed. This device must be installed in traction elevators and roped hydraulic elevators.
What is the mechanism that detects if the elevator is going too fast?
In addition, there is a device which detects whether the elevator is moving faster than its maximum designed speed; if this happens, the device causes bronze brake shoes to clamp down along the vertical rails in the shaft, stopping the elevator quickly, but not so abruptly as to cause injury.
What mechanisms are traditionally used in elevators?
Elevators are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist, although some pump hydraulic fluid to raise a cylindrical piston like a jack.
How does an overspeed governor work in an elevator?
The speed governor is generally located in the elevator machine room. … Speed governor switch and tension wheel switch shall ensure that the control loop can be cut off quickly and reliably when the rope breaks off, falls off, the rope clamp is unhooked or the speed governor is in action.
What principle do roped elevators work on?
They work on the principle of an electrically powered pump that pushes pressurized hydraulic fluid – typically oil — to a jack lifting system. A piston within a cylinder at the base of the elevator pushes the car up and down.
What is the purpose of counterweight in an elevator?
The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and is less taxing on the lifting machine. Counterweights are often used in traction lifts (elevators), cranes and funfair rides.
What is OSG in elevator?
An overspeed governor is an elevator device which acts as a stopping mechanism in case the elevator runs beyond its rated speed. This device must be installed in traction elevators and roped hydraulic elevators.
What types of pulleys are used in an elevator?
A movable pulley is a pulley that is free to move up and down, and is attached to a ceiling or other object by two lengths of the same rope. Examples of movable pulleys include construction cranes, modern elevators, and some types of weight lifting machines at the gym.
What is the difference between lift and elevator?
Lifts are the mechanisms that lift us to our desired level. An elevator is a type of vertical transport equipment that efficiently leads people or assets within a building’s floors. … The central contrast between Lift and Elevator is their usage. An elevator is a permanent construction, whereas the lift isn’t.
How many pulleys are used in an elevator?
Adding a counterweight and two pulleys with a motor in the middle makes an elevator easier to move. But how can a wheel with string over it help us move the huge stones required to build a pyramid? Well, pulleys help us by changing the direction of the force we use to lift an object.
What happens if elevator cable breaks?
Even if all the cables snapped, an elevator still would not fall to the bottom floor. Elevators have a passive, automatic, built-in braking system. The brakes require no electricity, no remote control, and no human operator. These brakes lock in place whenever the elevator starts to fall faster than an allowed amount.
Do hydraulic elevators have governors?
Roped hydraulic elevators use cables and a piston attached to a sheave to extend the rise of a holeless hydraulic elevator. Since a rope is holding up the elevator cab, a governor is required.
How many types of elevators are there?
There are four main types of elevators: hydraulic, traction, machine-room-less, and vacuum.
Why is there a mirror in the elevator?
Mirrors actually help to give the optical illusion of the lift being larger than it is, which helps some people who have claustrophobia to deal with their journey within the box. The purpose of having mirrors within the lift is to allow you to see what everyone is doing.
What is the most common type of elevator?
Traction elevators are the most common type of elevator. They can be geared or gearless and both model types are driven by alternating current (AC) or direct current (DC) electrical motors. In geared elevators, there is a gearbox attached to the motor that drives the wheel and moves the ropes.
Which motor is used in elevator?
Conventionally, there are, in general, three types of motors used in elevator systems: AC, DC and a hybrid between the two. The AC-2 motor is a primitive motor drive popular at least half a century ago for low-speed elevators. It is usually coupled with a worm gear to reduce speed and increase driving torque.