Revolutionary linear actuator replaces pneumatics
A
THK UK product story
Edited by the Engineeringtalk editorial team
Jul 30, 2004
A novel motor-driven linear actuator has been specially developed to replace traditional pneumatic cylinders.
A novel motor-driven linear actuator 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 - 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/s 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/s2.
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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