Telescopic cylinders are also known as telescoping cylinders and multi-stage telescopic cylinders. Their special design enables them to be highly compactable, yet have an amazing extension capability. The most common application is their use in utility and waste management, like dump trucks and dump trailers. You’ll also find them in hoist and lift environments where it’s necessary to raise machinery at high angles such as construction, mining, forestry, marine expeditions, military, agricultural, and demolition sites. When a high level mounting space is limited and its application needs a long stroke, then a telescopic cylinder is the ideal solution.
Telescopic cylinders are shaped like its name – a telescope. Steel tubing with an orderly series of smaller diameters are nestled inside each other. These diameters, from top to bottom, are referred to as main or barrel, stages, and plunger. This moving procedure continues for each stage until the smallest diameter stage is fully extended and it works conversely. Telescopic cylinders are designed in multi-stage units of 2, 3, 4, 5, and occasionally 6 stages. The operating psi on telescopic cylinders is 3,500 and is basically a simple design for powerful pressure use. It contains easy to remove head and rod seals, with great sealing and pressure capabilities. The tapered head of a telescopic hydraulic cylinder is for tighter radial clearance.
Custom Telescopic Hydraulic Cylinders are a constant thrust and speed cylinder, which allows its moving stages to extend at the same time. It provides an overall regulated speed and forced pressure throughout its stroke when it moves up and down. In its use in mining operations, telescopic hydraulic cylinders are great because it does not require a lot of space and doesn’t sacrifice on reliable performance.
There are two basic types of telescopic hydraulic cylinders: single and double acting. Single acting telescopic cylinders rely on gravity or an external force to retract. Pressurized oil aids in extending the telescopic cylinder and when pressure is released, the weight forces oil out of the cylinder for retraction. Double acting telescopic cylinders are powered in both directions and they work best in non-critical positioning applications which need extension and retraction actions in heavy load situations.
There are certain applications which employ both a single acting telescopic cylinder and a double acting cylinder. This type of cylinder action is used in large construction environments, like off shore drilling rigs. When the rigs finish their work, the telescopic hydraulic cylinder begins it work by reverting from a vertical position back to a horizontal position. The cylinder portion needs hydraulic power to retract, but then the telescopic cylinder starts operating like a single acting unit.
If you’re looking for a telescopic or any other hydraulic cylinder, then Southern Hydraulic Cylinder, Inc. would be an ideal place to start. They can provide you with standard or custom hydraulic cylinders to suit all of your specific applications.
