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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

The best of both worlds

The best of both worlds There are many linear motion applications where the choice between hydraulics and pneumatics is a trade-off. You'd like the speed of pneumatic operation but the accuracy and controllability of hydraulics. Well now you can actually have both. The AZ piston rod cylinder from Hoerbiger-Origa is the epitome of a good OEM product, offering the maximum possible configuration flexibility. Highly flexible, the AZ cylinder is available in profile tube or tie-rod versions, in both single and double-acting versions, and with the option of through piston rod operation. Users can specify single or double end air connections, and can select the position of these air connections. Further options include non-rotating or guided versions, high temperature versions (up to 150degC), ATEX versions, and corrosion resistant versions. For use in the most aggressive environments, users can also specify metal scraper seals to keep any contaminants out of the cylinder. Most interesting, though, for machine designers working in applications whose requirements are typified by the conditions discussed, is the ability of the AZ to work in hydraulics mode. So how is this achieved? The typical low pressure air/oil circuit is actually quite simple. A pneumatic 5/3 valve is used to operate the cylinder by putting air on the appropriate reservoir forcing the oil in to the cylinder to generate the cylinder movement. The oil on the other side of the cylinder is returned to the other reservoir. Control is achieved via the adjustable restrictors in the oil lines, and when the control valve is the neutral position, the oil is 'locked' in the cylinder by the two 2/2 valves holding the cylinder in position. The cylinder movement will be smooth even at slow speeds and consistent even with varying loads.

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