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Parker Hannifin has launched the HMIX electro-hydraulic cylinder for applications including machine tools, plastic injection moulding machines, welding machines and test equipment.

The HMIX cylinder is a fully integrated subsystem, combining Parker tie-rod cylinder technology with high-precision feedback transducer, manifold and pipework into a single easy-to-fit unit.

This enables machine developers and builders to enhance the functionality and performance of machine systems, quickly and simply, while reducing installation, configuration and maintenance times.

Central to the overall performance of the HMIX electro-hydraulic cylinder is an internally mounted magnetostrictive transducer.

This provides continuous analogue or digital feedback of the actuator’s position, derived from the interaction of two magnetic fields.

These are generated by a permanent magnet attached to the actuator piston, and by a magnetic pulse produced by a current pulse launched along a copper core inside a waveguide tube, which runs the length of the piston rod.

The interaction between the two fields produces a torsional strain pulse, which travels down the waveguide tube and is sensed by a coil at the end of the device.

The position of the piston-mounted permanent magnet is established by measuring the elapsed time between the start of the current pulse and the arrival of the strain pulse, with interface electronics then being used to convert this information to a digital or analogue output.

This robust and reliable technology can be used under closed- or open-loop control.

For the former, the transducer can provide accurate information of position, velocity or motion control over the full stroke of the cylinder, while in the latter mode the transducer acts as a continuous, infinite-resolution position-monitoring device.

The compact design of the transducer means that the HMIX electro-hydraulic cylinder is only slightly longer than a standard device, helping to simplify machine layout.

Similarly, the non-contacting design of the transducer, the tough steel protection tube for the transducer electronics and connector, plus the use of high-tensile, carbon alloy steel piston rods and one-piece steel piston, mechanically locked to the rod, ensures a long and trouble-free operating life.

The precision-machined steel manifold and rugged steel pipework have been engineered to offer reliability, even under the most demanding conditions, and are designed to deliver optimum flow dynamics, to improve system performance and speed of response.

The manifold can be connected directly to a range of industry standard control valves, and can be supplied to fit NG6, NG10 and NG16 valve sizes, depending on the power and speed requirements of each application.

The HMIX electro-hydraulic cylinders have been introduced for designers and machine builders assembling a system from off-the-shelf, pre-assembled and tested components.

Where a full, integrated electro-hydraulic axis control system is required, Parker offers a purpose-built cylinder with dedicated control valve and digital controller, supplied complete and ready for installation.

HMIX electro-hydraulic cylinders are suitable for operating pressures up to 210 bar, and are available in a range of eight mounting styles, with bore sizes from 40mm to 200mm and stroke lengths of up to 3,000mm.

Parker Hannifin — Parker Sales UK

With annual sales exceeding $10bn, Parker Hannifin is the world's leading manufacturer of motion and control technologies and systems, providing precision-engineered solutions for a wide variety of commercial, mobile, industrial and aerospace markets.

To meet its customers' needs in motion and control, Parker provides the broadest range of products available from any single supplier. This is supported by expertise in nine major technologies:

  • Hydraulics
  • Pneumatics
  • Electromechanical
  • Filtration
  • Process control
  • Fluid and gas handling
  • Sealing and shielding
  • Climate control
  • Aerospace

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