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About Hydraulic Cylinders
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About Hydraulic Cylinders
Hydraulic cylinders are linear hydraulic motors that
turn the hydrostatic power of a fluid into mechanical power. Typically,
the hydraulic fluids utilized in the cylinder are oil, most commonly
used in industrial applications, and water. Hydraulic cylinders consist
of a plunger or piston inside a cylindrical housing. The bore of the
cylinder must be perfectly cylindrical to prevent any obstruction of
the piston. Piston seals prevent internal leakage from the high pressure
side of the hydraulic cylinder to the low side. Rod seals are used to
prevent external leakage. Piston rods, which move in and out of the hydraulic
cylinder, are usually hard chrome plated to provide protection from corrosion
and wear resistance. Hydraulic cylinder distributors most often offer
their products in steel, stainless
steel or aluminum.
Hydraulic cylinder distributors can supply single action hydraulic cylinders
or double action hydraulic cylinders. A single-acting hydraulic cylinder
is configured for motion in only one direction, either pulling in or
pushing out. An internal spring is used to provide plunger return when
the hydraulic pressure is removed. In single-action hydraulic cylinders,
less valving and plumbing is needed than in double-acting hydraulic cylinders.
The more complex double-acting hydraulic cylinder is pressurized to move
in both directions along the vertical or horizontal plane, or any other
plane needed. These custom hydraulic cylinders provide higher speed operations
and tighter control than single-acting hydraulic cylinders, and are less
sensitive to system back pressures that can occur due to long tube lengths
in telescopic cylinders.
Telescopic cylinders have strokes that extend far beyond that of a standard
hydraulic cylinder. Telescopic cylinders are multi-stage hydraulic cylinders
that are ideal for applications in which there are severe space limitations.
Telescopic double-acting hydraulic cylinders are highly complicated,
as they actually consist of three or four concentric tubular components.
These custom hydraulic cylinders and components need to be manufactured
to a high degree of precision and accurately put into position with precise
clearances. The outer piston must have all the characteristics of a hydraulic
cylinder body from the inside and all the features of the piston rod
on the outside. Special provisions are made to allow the passage of fluid
up to the inner hydraulic cylinders. Telescopic cylinders are used in
a variety of industries, such as agriculture, construction and machinery
manufacturing.
Hydraulic cylinders are often used as part of a larger hydraulic system
that includes pumps, valves and motors. Hydraulics can be effectively
combined with other technologies through the use of sensors, transducers
and microprocessors. Hydraulic cylinder distributors work with many industrial
equipment applications, including bulldozers, aerial lifts, weapon systems,
drilling rigs, forklift
trucks, farming and demolition equipment, etc.
When ordering hydraulic cylinders, it is important to know the bore,
stroke and rod sizes, the retracted pin center, the pressure requirements
for the extending and retracting of the piston rod and the flow rate
of the hydraulic fluid. Other necessary pieces of information concerning
hydraulic cylinders include rod material, operating temperature range
and coating.
Featured
Articles
http://www.wisegeek.com/what-is-a-hydraulic-cylinder.htm
http://www.hydraulicspneumatics.com/200/Issue/Article/False/21653/Issue
Types of Hydraulic Cylinders
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use hydraulic pressure to actuate the rod to extend and retract in both
directions.
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are designed for high pressures, high flows and rugged environments.
Heavy duty cylinders are particularly suited to demanding industrial
and mobile applications.
- have significantly smaller and lighter designs than
standard cylinders, which saves substantial weight and space in equipment.
High pressure hydraulic cylinders are used in applications that need
high forces and short or medium strokes, such as material testing and
material transforming.
- make the appartus changes hydraulic fluid into mechanical power.
- use hydraulic fluid to make mechanical power.
- are the large output pistons.
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are designed for a multitude of applications in which a large force
is required in both the push and pull directions.
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are used in many applications, such as snowplows, construction equipment,
personnel lifts and material handling equipment.
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use hydraulic pressure to actuate the rod in only one direction.
- can have strokes of less than an inch and are used in applications that require extreme precision.
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are two-way hydraulic cylinders that provide a faster starting stroke
and a subsequent, more powerful working stroke.
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have multiple stages which enable longer strokes to be achieved, while
utilizing less space.
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have their head gland threaded on and the threads are protected by an
o-ring.
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use one or more tie-rods, which are installed on the outside diameter
of the cylinder housing, to provide extra stability. Cylinder tie-rods
commonly bear a large portion of the applied load.
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are made of a heavy duty, smooth welded housing for increased stability.
Most housings of hydraulic cylinders are made of multiple parts, but
not in the case of welded cylinders.
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