Unformatted text preview: ELEVATOR
ELEVATOR Prepared by : Vaishnav Jay. A 5th C.E
Guided by :
Mr. V.K.Patel Elevator
An Elevator (or lift) is a type of vertical transport equipment that efficiently moves people or goods between floors of a building, vessel or other structure. How The Elevator How The Elevator Works
Elevators are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, or pump hydraulic fluid to raise a cylindrical piston like a jack. The Basic Design
The Basic Design
The basic design is a compartment that is somehow lifted Two Types of Elevators: • Hydraulic
• RopeGeared The Hydraulic Elevator
The Hydraulic Elevator The car is moved up and down using “a fluid piston mounted inside a cylinder” (Harris).
Consists of three parts:
• Tank Pump
Valve Hydraulic Elevators
A Closer Look The car is placed on a piston.
Fluid Pumping System
A tank (off to the side) holds the fluid. When the valve closes, the car is lifted. When the valve opens, the car is lowered. Hydraulic Disadvantages
Hydraulic Disadvantages Two Disadvantages • Must Have Enough Room
• Energy Inefficient RopeGeared Elevators
These are the most popular types of elevators. Rather than being pushed from below, these types of elevators are moved using cables RopeGeared Design
RopeGeared Design Cables attach to the car and through a sheave. The sheave is connected to an electric motor.
Motor turns one way, elevator moves up. Motor turns the other way, elevator moves down.
The ropes are connected to a counterweight. The counterweight system serves as a means for conserving energy. RopeGeared Design (Cont’d)
RopeGeared Design (Cont’d) Rails are used to guide the elevator
Keep elevator and counterweights steady.
Ropegeared elevators are much more efficient and safer. Safety Systems
Safety Systems More ropes than needed
Builtin brake systems
Governor prevents the elevator from falling to the bottom of the shaft.
Centrifugal force causes a brake system to activate.
Also has an electromagnetic brake that is activated if the elevator loses power.
Automated Brake System at the top and bottom of the shaft. Moving To Destinations
Moving To Destinations Modern elevators use computers.
Only answer “up calls” as going up and the same for going down.
Modern “Smart” systems take into account the busiest parts of the day.
Press the floor you want in the lobby.
Load Sensor ...
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- Spring '11
- Elevator, safety systems