HYDRAULIC LIFT

GCUF LAYYAH CAMPUS

Hydraulic lift is a device used for carryingpassenger or goods from one floor to another in

multi- storied building to raise heavy objects.

HYDRAULIC LIFT DEFINITION

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.

WORKING PRINCIPLE OF HYDRAULIC LIFT

WORKING PRINCIPLE IN AN VIDEO FOR CLEARING THE CONCEPT

TYPES OF HYDRAULIC LIFTS

TYPES

DIRECT ACTING HYDRAULIC LIFT SUSPENDED

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.

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.)

CONSTRUCTION DETAIL

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.

SUSPENDED HYDRAULIC LIFT

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.

CONSTRUCTION DETAIL

Power steering fluid is a subtype of hydraulic fluid. Most are mineral oil or silicone based fluids, while some use automatic transmission fluid, made from synthetic base oil.

What liquid is used in hydraulics lifts?

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.

MODERN INNOVATIONS

APPLICATIONS OF HYDRAULIC LIFTS:

1 •Wheel chair lift.

2 •Industrial hydraulic applications.

3 •Material handling.•Truck trailers.

http://engineering.myindialist.com/2009/working-principle-of-hydraulic-lift-direct-acting-and-suspended-type/#.WEMIJdIrJdg

REFERENCES

3 • Hamza Gujar # 856

4 •Basit Roll no#882

5 •Yousif ROLL#862

GROUP MEMBERS NAMES

•AZMUL HASSAN ROLL # 8812

1 •SHAHID AKRAM ROLL # 885