Wednesday , September 20 2017

Hydraulic Cylinders usability in Industrial and Mechanical field

Hydraulic cylinders transform engine’s hydrostatic power into mechanical power. These are deemed as actuators or motors. However, hydraulic cylinder vary from hydraulic motors as they perform a linear (translatory) movement instead of a rotary movement. Thus, the cylinders are commonly known as linear motors.

Exactly How Much Force Does You Get? Understand the Mathematics driving Hydraulic Cylinders that given here:

The maximum cylinder force ‘F’ relies on the utmost operating pressure ‘p’ and the section of the piston (effective area ‘A’). At steady pressure, a cylinder using a larger effective area ‘A’ will generate a larger force ‘F’. At higher pressures, the force ‘F’ will be higher:

F = p • A [in kN]

You require hydraulic cylinders to perform particular types of work: for example, in applications like those where loads have to be lowered, lifted, locked or moved.

Types of Hydraulic Cylinders

In hydraulic cylinders, 2 functional types are often known: “double acting & “single acting” cylinders. Exclusively rapid traverse cylinders and telescopic cylinders are available as either “double acting or “single acting” cylinders. In regard to function, it is easy to sort out hydraulic cylinders as listed below:

Double-Acting Cylinders

  • Telescopic cylinders
  • Differential cylinders
  • Double rod cylinders
  • Tandem cylinders
  • Rapid traverse cylinders

Single-Acting Cylinders

  • Telescopic cylinders
  • Push-action cylinders
  • Pull-action cylinders
  • Rapid traverse cylinders

Single acting cylinders get one effective area, that comes with the bottom side, which often can exert force in single direction. For almost all hydraulic systems, these are generally designed as plunger cylinders plus an alternative force is required to send back the piston to the starting position: e.g. lifting devices, upstroke presses etc.

If there is no force to send back the piston towards the starting position, springs have to be placed. This is quite often possible with small cylinders mainly because of the limited force & stroke length of the return springs.

Telescopic cylinders are commonly used in hydraulic lifting purposes, or wherever large amplitudes are very important but only a little bit space is out there, e.g. tipper trucks. The single acting or double acting differential cylinder is often found in industrial and mobile hydraulic units. The most typical design principles of the hydraulic differential cylinder in mill type and tie rod design is discussed in the next segments of this article.

Tie Rod Cylinder

Tie rod cylinders are widely-used in machine tools, the transfer lines, automotive industry and plastics machinery along with other manufacturing devices. The key feature of the tie-rod cylinder is its space saving compact design that makes it particularly ideal in manufacturing devices.

Key aspects of the tie-rod hydraulic cylinders:

  • Wide mounting range
  • Limited stroke length
  • Compact design
  • Limited piston diameter

The top and bottom of the tie-rod cylinder, together with the cylinder barrel, are connected together via four tie-rods. Extended tie-rods at the head or base of the cylinder is often used to mount the tie-rod cylinder. Threaded holes and sub-plate mounting alternatives are included as well in the wide mounting range of the tie-rod cylinder.

Typical variables are:

  • Maximum stroke speed: 0.5 m/s
  • Nominal pressure: up to 200 bar
  • Maximum stroke length: 2,000+ mm
  • Piston rod Ø: 16 to 250 mm
  • Piston Ø: 25 to 360 mm

Mill Type Cylinder

Mechanical engineering is the field of activity for mill type cylinders. They are accustomed in mobile machinery, civil engineering, steel and iron works, cranes, offshore applications, presses and ship-building. The key feature of mill type cylinders is their robustness.

Key aspects of the mill-type hydraulic cylinders:

  • High nominal pressure
  • Long stroke length
  • Robust design
  • Larger piston diameters

The top and bottom of a mill type cylinder and the cylinder barrel are screwed, welded or tightly connected with bolts or retaining rings. In comparison to tie-rod cylinders, mill-type cylinders have fewer mounting possibilities, yet, standard mounting, such as flange, clevis, trunnion and foot mounting, are possible.

Typical variables are:

  • Maximum stroke speed: 0.5 m/s
  • Nominal pressure: up to 350 bar
  • Maximum stroke length: 6,000+ mm
  • Piston rod Ø: 14 to 220 mm
  • Piston Ø: 25 to 450 mm

Servo Cylinder System

Servo cylinder systems are hydraulic cylinders having hydrostatic bearings. Hydrostatic bearings have minimal friction and are perfect in situations where high oscillation frequencies using small amplitudes are required. Such as materials screening devices and motion simulators.

Key aspects of a servo hydraulic cylinders:

  • High dynamic response
  • High speeds
  • Low friction
  • Accuracy

Servo cylinder systems are accessible with hydrostatic wedge cap bearings or with full hydrostatic bearings that is cavity bearings. The type of bearings you need relies on the required speed of the hydraulic system in operation.

Typical variables are:

  • Pressure: up to 210 bar (with cavity bearings up to 280 bar)
  • Force: 1 to 4,000 kN (up to 10,000 kN with cavity bearings)
  • Stroke speed: 2 m/s (up to 4 m/s with cavity bearings)

Here is a 15 minutes video to describe how hydraulic cylinder works:

If you are looking for some used hydraulic cylinders (though we will not recommended that only if you are in financial crisis and you need it for light weight tasks) here are some suggestion from us:


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