A multi-stage telescopic cylinder has many cylinder bodies inside one another. That is, the piston rod of the first stage is used as the barrel of the second stage, and the second piston rod is used inside the barrel of the second stage. Similarly, there can be up to six stages in the cylinder. Therefore, the total stroke length of the telescopic cylinder can be up to six times the stroke length of the basic cylinder.
Single-acting Telescopic Cylinder
Figure (a) shows the single-acting telescopic cylinder. It is a multi-stage cylinder with two to six concentric tubular envelopes. Most telescopic cylinders are single-acting, where the fluid pressure always acts in one direction.
Textbook on ‘Hydraulic Cylinders in the SI Units’
By Joji Parambath
This book deals with hydraulic cylinders of varying designs. It explains in detail the principles of operation, constructional details, and classification of hydraulic cylinders. This chapter also covers the topics of position transducers, swing clamp cylinders, applications, design aspects, advantages, and safety requirements of hydraulic cylinders. The book uses the SI system of units.
Textbook on ‘Hydraulic Linear Actuators in the English Units’
By Joji Parambath
Please click on the images to go to the book link on Amazon.com
Double-acting Telescopic Cylinder
Figure (b) shows the double-acting telescopic cylinder. In this type of telescopic cylinder, the system pressure acts alternately to extend and retract the cylinder. Double-acting telescopic cylinders are highly complicated and must be specially designed and manufactured with a high degree of precision. Therefore, they are much more expensive than regular hydraulic cylinders.
Telescopic cylinders are ideal for applications that require long-stroke cylinders in a space-constrained environment. They are widely used in hydraulic equipment for the agriculture, construction, and heavy engineering industries. They are also commonly used in mobile hydraulic systems for the tilting of truck dump bodies and forklifts, the lifting of hydraulic cranes, and material handling. Telescopic cylinders are constructed of single-acting and double-acting varieties.
Joji Parambath
Director
Fluidsys Training Centre Pvt Ltd
Bangalore, India
Please contact Fluidsys Training Centre Pvt Ltd for your training needs.
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