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Linear actuators can replace pneumatic cylinders
A
THK UK product story
Edited by the Manufacturingtalk editorial team
Aug 3, 2004
Novel motor driven linear actuator that has been specially developed to replace traditional pneumatic cylinders is virtually maintenance free and offers precise, high speed control.
THK, one of the world's leading manufacturers of linear motion technology, has launched a unique motor driven linear actuator that has been specially developed to replace traditional pneumatic cylinders.
Called the VLA, the new linear actuators are virtually maintenance free and offer precise, high speed control at low cost in a variety of manufacturing, assembly, test and inspection applications.
The new VLA linear motion solution offers a number of benefits over traditional pneumatic solutions including the elimination of oil mist lubrication and air venting noise, resulting in a cleaner, quieter and more energy efficient system.
Furthermore, when combined with an AC servomotor, the VLA linear actuator is capable of providing high movement at speeds up to 1000mm/s.
Lightweight and compact the new VLA is available in two specially designed models - the VLA-CT cylinder type and VLA-ST slider type - which are each available in three different sizes.
The VLA-CT incorporates a feed rod that is driven using a ballscrew and exits the aluminium profile in a manner similar to that of a pneumatic cylinder.
The ballscrew is equipped with the QZ lubricating system and Laminated Contact Scraper (LaCS) to prevent dirt particles from penetrating the device.
The VLA-ST is also driven by a ballscrew that moves the slider on an SRS type Caged Ball linear motion guide; a stainless steel cover strip is incorporated to protect the interior of the system.
The VLA-CT provides a maximum continuous velocity of 600mm/sec with an applied force of 402N, whereas the VLA-ST is designed to produce a velocity of 1000mm/s with a continuous force of 267N.
In addition, the VLA-ST can carry a maximum horizontal payload of 30kg and a vertical payload of 10kg, with a maximum acceleration of 3m/sec2.
Both the VLA-CT and VLA-ST have operating lives of 5000km and repeatability of +/-0.020mm.
Offering high levels of flexibility and designed to be easy to install, the new VLA range can be used in conjunction with a wide range of motor types.
A range of options such as base attachment brackets, flanges and couplings is also available.
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