The extremely cost-effective new ejector provides highly dynamic handling by enabling minimal cycle times. Thanks to the innovative blow-off boost effect, workpieces are deposited quickly, precisely and above all gently – ideal for high-speed applications in automation and robotics.
The use of blow-off to dissipate a vacuum has come to be considered as state of the art technology. In this process, a valve diverts some of the compressed air directly to the vacuum cup instead of to the vacuum nozzle, depositing the workpiece. What makes this product innovative is that the blow-off flow is supplied not only via the compressed air line, but also from the ambient air. This boost effect triples the blow-off flow, ensuring that workpieces are deposited very quickly. A solenoid valve with a switching time of a few milliseconds also enables ultra-short response times, making the ejector the perfect component for highly dynamic handling processes. Typical fields of application include Delta robots in packaging technology, electronics production or microassembly.
Precision depositing for grippers with multiple vacuum cups
The new ejector’s compact design and low weight make it ideal for integration into vacuum systems where each vacuum cup is supplied by a separate ejector. The blow-off boost effect combined with the minimal response time enables workpieces to be deposited precisely and simultaneously. In contrast to grippers with a central ejector to supply the vacuum and a certain line length between the ejector and the vacuum cup, there is no lateral workpiece swinging due to different blow-off speeds. As a result, the new ejector with blow-off boost significantly improves both cycle time and handling precision.
How the blow-off boost effect works
Compressed air flows directly to the vacuum nozzle during suction. As soon as the gripper control activates the solenoid valve, a three-part blow-off flow is generated - causing the boost effect - and the compressed air is diverted to the vacuum cup. In addition, air is also conducted via a jet nozzle from the compressed air line to the vacuum cup. This jet stream also causes ambient air to be sucked in via the ejector outlet and conducted to the vacuum cup. This reverse flow is proportional to the prevailing vacuum level, and decreases until the vacuum has dissipated so that the final blow-off air only comes from the compressed air line. This boost effect accelerates workpiece depositing and ensures that they are deposited very gently and precisely. Since ambient air is primarily used for a large part of the blow-off, compressed air consumption is reduced.
The new ejector with blow-off boost at a glance: