o spare festival-goers the frustration of getting to the beer tent and finding the queue for a drink is too long, One Two Beer from Vienna has developed an automatic, fast, beer dispensing
system. The centrepiece is a mobile dispensing head that inserts into the bottom of cups and enables refilling in five seconds without over-foaming. This features a lubrication-free, hygienic and durable dryspin drive spindle from igus. In operation, two plastic cups are placed side by side and, at the push of a
button, two dispensing heads move to the bottom of the cups. The beer flows fast and, by filling from the cup base, there is no over-foaming. The beer is tapped in just five seconds, and you are back at the concert in no time! The manufacture of the system was, however, a design challenge. “In order
to enable a pour within seconds, a fast and low-friction linear guide was essential,” explained Tamás Kozma, chief information officer at One Two Beer. The system needed to deploy to a tenth of a millimetre, and also be as
compact as possible to enable efficient transport. It also has to be insensitive to the harsh festival environment – including dust, high temperatures and condensation. Furthermore, being in the food sector, a 100% lubrication-free application with FDA compliance was also crucial. A complete linear guide unit consisting of a compact lead screw and nut
from the igus dryspin series, as well as a suitable stepper motor, proved to be the solution for this application.
With the design, the tap is mounted on a flange threaded nut from the dryspin drive spindle series. When the NEMA-23 spindle stepper motor rotates the spindle, the tap moves up or down. The threaded nut is made of an FDA-compliant high-performance plastic, a material with self- lubrication that allows for low-friction, dry running (FDA = US Food & Drug Administration). Unlike lubricated metal variants, the polymer nut does not run the risk of becoming a dirt magnet from the lubricating grease. It is easy also to clean, with water or high-pressure air; and the linear guide is both hygienically and mechanically sound. Due to the pairing of plastic and stainless steel, there is also no corrosion. Furthermore, by eliminating relubrication work, maintenance is unnecessary. It is, however, not only corrosion resistance and insensitivity to dirt that
gives the linear guide a long service life – the geometry of the dryspin technology also enables high performance. “Thanks to this asymmetry, we have managed to extend the guide’s service life by around 30% compared to symmetrical trapezoidal threads,” commented Rob Dumayne, drytech director at igus UK. “In addition, the flank angles of the threaded nut and spindle are flattened, so we can achieve an above-average efficiency of 82%.”
37 See One Two Beer in action:
https://youtu.be/iOvOOd8lioo
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