# Hydraulic lift

Summer Trainee in POWER PLANT at DCM SHRIRAM LTD
Sep. 29, 2015

### Hydraulic lift

1. HYDRAULIC LIFT SUBMITTED TO: Mr. DEVESH PANDEY SUBMITTED FROM: SHIKHAR SARASWAT(51) SHUBHAM SAXENA (52) SHUBHAM SINGHAL (53) SHUBHAM SINGHAL (54) SUNIL DHAKKAR (55)
2. WHAT IS HYDRAULIC LIFT? Hydraulic lift is a device used for carrying passenger or goods from one floor to another in multi- storied building to raise heavy objects.
3. HISTORY OF HYDRAULIC LIFT  The need for vertical transport is as old as civilization. Over the centuries, mankind has employed ingenious forms of lifting.  The first elevator designed for a passenger was built in 1743 for King Louis XV at his palace in France. The one-person contraption went up only one floor, from the first to the second. Known as the "Flying Chair," it was on the outside of the building, and was entered by the king via his balcony.  By 1850 steam and hydraulic elevators had been introduced, but it was in 1852 that the landmark event in elevator history occurred: the invention of the world's first safety elevator by Elisha Graves Otis. The first passenger elevator was installed by Otis in New York in 1857.
4. PRINCIPLE OF HYDRAULIC LIFT  Pascal's law is a principle in fluid mechanics that states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations (initial differences) remain the same.  This law is applied to lifts.
5. TYPES OF HYDRAULIC LIFTS TYPES DIRECT ACTING HYDRAULIC LIFT SUSPENDED HYDRAULIC LIFT
6. DIRECT ACTING HYDRAULIC LIFT  When fluid under pressure is forced into the cylinder, the ram gets a push upward. The platform carries loads or passengers and moves between the guides. At required height, it can be made to stay in level with each floor so that the good or passengers can be transferred.  In direct acting hydraulic lift, stroke of the ram is equal to the lift of the cage.
7. CONSTRUCTION DETAILS Components of direct acting hydraulic lift:  Fixed cylinder: It is fixed with the wall of the floor, where the sliding ram reciprocate when we apply the pressure.  Cage: It is fitted on the top of the sliding ram where the load is placed (i.e. lifted load).  Sliding ram: It is fitted in the fixed cylinder which is reciprocate (upward or downward direction) when we applied the pressure (i.e. reaches the floor wise.)
8. SUSPENDED HYDRAULIC LIFT WORKING :-  When fluid under pressure is forced into the cylinder, the ram gets reciprocate to the movable pulleys. With the help of arrangement of hydraulic jigger; pulley can rotates; with the help of wire rope the cage is maintain there pressure force with there floor. At required height, it can be made to stay in level with each floor so that the good or passengers can be transferred.  Working period of the lift is ratio of the height of lift to the velocity of lift.  Idle period of lift is the difference of the total time for one operation and the working period of the lift.
9. CONSTRUCTION:-  Cage: It is fitted on the top of the sliding ram where the load is placed (i.e. lifted load).  Wire rope: It connects the cage to pulley.  Sliding ram: It is fitted in the fixed cylinder which is reciprocate (upward or downward direction) when we applied the pressure (i.e. reaches the floor wise)  Pulleys: pulleys are connected to the sliding ram and fixed cylinder; where one pulley is fixed and other pulley is movable.  Hydraulic jigger: It consists of a moving ram which slides inside a fixed hydraulic cylinder.  Fixed cylinder-: It is fixed with the wall of the floor, where the sliding ram reciprocate when we apply the pressure.
10. APPLICATIONS OF HYDRAULIC LIFTS: 1. • Wheel chair lift. 2. • Industrial hydraulic applications. 3. • Material handling. • Truck trailers.
11. MODERN INNOVATIONS  Now days the speed of hydraulic lifts has been increased enormously.  By using working oils in hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased.