Elevators - ELEVATOR ELEVATOR Prepared by : Vaishnav Jay. A...

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Unformatted text preview: ELEVATOR ELEVATOR Prepared by : Vaishnav Jay. A 5th C.E Guided by : Mr. V.K.Patel Elevator 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 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 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. Slows down 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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This note was uploaded on 10/11/2011 for the course SDSAF sf33 taught by Professor Sfs33 during the Spring '11 term at École Normale Supérieure.

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