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Hydraulic cylinder: Introduction, structure & classification

Posted at: Jul 18, 2019 - 1964 Views

This article will focus on the introduction, classification, hydraulic cylinders in the transmission.
The first is the concept, the name of the parts of the hydraulic cylinder. The figure below has a caption called some parts of a hydraulic cylinder.

Most of us are so familiar and seem to know very well about hydraulic cylinders (in the South you call ben hydraulic). However, there are many people who are embarrassed when they encounter the design, choosing a hydraulic cylinder suitable for their requirements.

This article will focus on the introduction, classification, hydraulic cylinders in the transmission.
The first is the concept, the name of the parts of the hydraulic cylinder. The figure below has a caption called some parts of a hydraulic cylinder.

Cylinder cylinder

Name :

  • Barrel: Cylinder cover
  • Pistons: pistons
  • Cylinder rod: Cylinder rod
  • Gland: Cylinder neck
  • Pin eye / Clevis: Assemble
  • Ports: Oil inlet / outlet
  • Piston seal; Rod seal, Wear ring; O-ring; Wiper seal:
  • The working parameters and dimensions of the cylinder

The three most important parameters of a hydraulic cylinder are: Bore diameters, commonly denoted D; rod diameter - d and stroke stroke, ie running distance of the cylinder head, - s.
D and d denote the size and thrust of the cylinder
S denotes the length and reach, the working distance of the cylinder.

Classification of hydraulic cylinders

Hydraulic cylinders are usually divided into two basic groups: one-way cylinders or two-way cylinders.

One-way cylinders :

One-directional cylinders produce only one-sided thrust, usually the cylindrical side, with hydraulic pressure applied to the rear of the cylinder. Roller cylinder will self-healing by the force of external or spring thrust inside. The most obvious thing for a cylinder is that it only has one oil supply door.

Two-way cylinders :

Two-way cylinders can produce both sides of force: When the cylinder comes out and even when it enters the cylinder. The internal sealing structure of the two-way cylinder is more complex than the one-way cylinder and has two oil lines on its body. Another big difference is that hydraulic systems using two-way cylinders must have a variable valve (distribution valve) to control the cylinder as shown below.

Cylinders can also be divided into cylinders: single-stage cylinders or telescopic cylinders.

Single cylinder :

Single cylinder is a type of cylinder is attached, together with the piston. This cylinder can only produce a range of motion that is smaller than the overall length of the cylinder, ie its working space is limited by the length of the cylinder, minus the piston rod thickness and mounting segments. inside the cylinder.

Cylinder liners are widely used and have wide applications. Most of it has a structure for rolling cylinders on one side of the cylinder. Some cylinders have a structure with cylinders on either side of the piston (called Double rod end cylinders). When one side of the cylinder sticks, the other side of the cylinder engages in the cylinder.

Multi-stage cylinders :

Multi-stage or Telescopic cylinders usually have 2-3-4 or up to 6 floors. It consists of a cylinder liner and several tubes that should be stacked together. This structure makes the cylinder can stretch the journey much longer than the basic size of the cylinder when the end of the rolling. This creates the ability to design details, machine structure neatly. However, multi-layer cylinders cost much more than single cylinders.

Multi-layered cylinders also have two types of structures: one-way cylinders and two-way cylinders; However, the two-way cylinder has a very complex structure and requires special designs to prevent the risk.

There is also a classification of hydraulic cylinders with two types of welded cylinders and Tie Rod cylinders.

Cylinders:

This cylinder is assembled and fixed by four high-strength steel guiding rods that lock the thread through to hold the parts from the cylinder head. (For large diameter cylinders, there are up to 20 bars. gu-rong hold). This type of cylinders makes it easy to remove, service the cylinders and also easy to manufacture from standard parts. Cylinders are often used in industrial applications.

Cylinder gurong :

Cylindrical welded structure
This cylinder head is welded to the cylinder liner to give the cylinder a rigid structure suitable for heavy duty applications on mechanical or industrial applications.
.

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