hydraulic fundamental 1
TRANSCRIPT
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hydrostatic systems (in common language it is also called simply hydraulics)
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. The liquid rises to the same level in all of the tubes, regardless of the shape or angle of the tube.
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Closed cylinder containing air (gas)
Closed cylinder containing
hydraulic fluid (liquid)12
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It refers to power produced by moving liquids.
It is defined as the use of confined liquid to transmit power, multiply force, produce motion (Reciprocating , rotary )
What is hydraulics ?
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HYDRAULIC SYSTEM
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INTERNAL COMBUSTIONENGINE
ELECTRIC MOTOR25
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Requirement for powerRequirement for power
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USE OF POWER
?SOURCE OF
POWERELECTRICAL
Connecting the sources of power
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Direct Drive
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POWERELECTRICAL
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STOPSTARTSPEED
DIRECTIONPOSITIONACCELERATION
CONTROL
Hydraulic Power Transmission is compact , safe, controllable, reversible
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By application :
Stationary Hydraulic. Mobile Hydraulics.
By Circuit:Open systemClosed system
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35Stationary Hydraulic
Mobile Hydraulics
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Hydraulic fluid, also called hydraulic liquid, are the medium by which power is transferred in hydraulic machinery
Hydraulic fluid( Oil)
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Types of hydraulic fluids
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Hydraulic fluids - requirements
Functionalo Good lubrication characteristicso Viscosity should not depend strongly on
temperature and pressureo Good heat conductivityo Low heat expansion coefficiento Large elasticity modulus
Economico Low priceo Slow aging and thermal and chemical
stability long life cycle42
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•When a force is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid.
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Pascal’s Law
Pressure applied to a confined fluid is:transmitted
undiminished in all directions,
acts with equal force on equal areas, and
acts at a right angle to the walls of the container.
10 psi
10-lb
1 in2
Area = 10 in2
Force = 100-lbs.
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APPLICATION
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PUMP ACTUATOR 54
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700 ton Cutting press
Piston area = 2829 cm3Pressure = 250Kg/cm2
Force applied on ram = F= P*A F= 250*2829 F= 700000 (700 ton)
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PUMP ACTUATOR
10 cm2
10 cm2
1000 kg 1000 kg
100 kg/cm2
P = FA
P = FA
=1000 10
= 100 kg/cm2P = FA
= P =FA
FA
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A
F = P x A = 10 x 10 = 100 kg
PUMP ACTUATOR
1000 kg
100 cm2
10 cm2
10 kg/cm2
100 kg
Force Multiplication
P = FA = 1000
100 = 10 kg/cm2
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W
10 A
10 F
A
F
10
1
A x 10 = VOLUME = 10 A x 1PUMP ACTUATOR
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