Hydraulic Cylinders and Parts. Parker Single Acting Telescopic Hydraulic Cylinders provide extremely long cycle life and are field-repairable. Parker telescopic cylinders are 2, PSI rated and support application specific requirements (stroke lengths, closed lengths, and. At Southern Hydraulic Cylinder, Inc. we manufacture our own line of telescopic cylinders and its components for over 25 years. For more information, call at. Telescopic Cylinders. EXTENDED DURABILITY IN TIGHT SPACES. Telescopic cylinders feature a multi-stage rod built of a series of nested steel tubes of.


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Design and technical terminology[ edit ] Showing the telescopic principle, an object collapsed top and extended bottomtelescopic hydraulic cylinder more reach. Telescopic cylinders are designed with a series of steel telescopic hydraulic cylinder aluminum [2] tubes of progressively smaller diameters nested within each other.

The largest diameter sleeve is called the main or barrel. The smaller inner sleeves are called the stages. The smallest stage is often called the plunger [4] or piston rod.

The cylinders are usually mounted in machinery by pivot mounts welded to the end or outer body of the telescopic hydraulic cylinder as well as on the end of the plunger.

There are exceptions however, with one pneumatic cylinder manufacturer successfully incorporating up to 9 stages in their cylinder designs.

The weight of the steel bodies and the hydraulic oil contained within the actuator create moment loads on the bearing surfaces between stages.


These forces, combined with the load being pushed, threaten to bind or even buckle the telescopic assembly. Telescopic hydraulic cylinder bearing surfaces must therefore be incorporated in the design of the actuator to prevent failure in service due to side forces.

Double Acting Telescopic Hydraulic Cylinders - Hyquip

Telescopic cylinders must only be used in machinery as a device for providing force and travel. Side forces and moment loads must be minimized.

Telescopic cylinders should not be used to stabilize a structural component. This is because the outward forces produced by internal hydraulic pressure tends to expand the steel sleeve sections. Too much pressure will cause the nested telescopic hydraulic cylinder to balloon telescopic hydraulic cylinder, bind the mechanism and stop moving.

The danger exists that a permanent deformation of the outer diameter of a sleeve could occur, thus ruining a telescopic actuator. For this reason, care must be taken to avoid shock pressures in a hydraulic system using telescopic cylinders.

Often such hydraulic systems are equipped with shock suppressing components, such as hydraulic accumulatorsto absorb pressure spikes. As with a single acting rod style cylinder, the single acting telescopic cylinder is extended using hydraulic or pneumatic pressure but retracts using external forces when the fluid telescopic hydraulic cylinder is removed and relieved to the reservoir.

This external retraction force is usually gravity acting on the weight of the load. This external weight must obviously be sufficient to overcome the friction and mechanical losses within the machine design even after telescopic hydraulic cylinder work portion of the machine cycle has been accomplished.

Telescopic Cylinder

In the example above of the dump truck, the weight of the dump body, now raised at an angle of 60 degrees but telescopic hydraulic cylinder of the load, must be enough to force the unpressurized hydraulic fluid out of the cylinder and cause it to retract to the fully collapsed position.

This aerial platform vehicle uses a telescopic hydraulic cylinder to extend the platform Double-acting[ edit ] Pneumatic telescoping telescopic hydraulic cylinder 5-stage, double-acting, demonstrating full extension and retraction A double acting cylinder is extended and retracted using hydraulic or pneumatic telescopic hydraulic cylinder in both directions.

Double acting telescopic cylinders are thus much more complex in design than the single acting type. This additional complexity is due to the requirement of adding retracting piston faces to all of the cylinder stages and the difficulty in supplying pressurized fluid to the retraction pistons of the intermediate stages.

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