GCUF Layyah Campus

2. 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.  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
DIRECT ACTING
HYDRAULIC LIFT
SUSPENDED
HYDRAULIC LIFT

6.  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.  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.  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.  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.  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.

11.  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.

12. 1
• Wheel chair lift.
2
• Industrial hydraulic applications.
3
• Material handling.
• Truck trailers.

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

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