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STANDARD & LEGISLATION
STANDARD & LEGISLATION - UCIF Informs
UCIF – Italian Surface Treatment Equipment Manufacturers’ Association
Milan, Italy info@ucif.net
In the mass finishing industry, there are different innovative processes for automatic cleaning of centrifuged muds, mainly focused on specific filtering systems.
Companies specialized in the automatic cleaning of centrifuged muds usually use centrifugal filters automatically managed by a modern PLC combined with frequency converter, a wide set of sensors and an innovative device which enables simultaneously the automatic removal of the mud accumulated in the centrifugal basket, on one hand and, on the other hand, a partial balance of the water lost during the meantime by evaporation or dropping out with each batch of finished workpieces from the massfinishing units. Thanks to sophisticated software, sensors, automation level and interactivity with each one of the finishing units, this advanced centrifugal filter is able to offer full compliance with the Industry 4.0 specs and, as an interesting option, the WI-FI remote management from a simple tablet PC. These companies summarize with these machines a simple solution, based on a high-pressure pump, as an alternative to mechanical devices with higher maintenance costs and investment. The machine starts: the raising pump of the receiving tank is stopped, the frequency control device starts the main rotation motor of the basket, the raising pump starts feeding the wastewater through the respective inlet pipe. The wastewater continues being fed, filtered from the suspended solids through centrifugation; the clarified water to be sent to the machines gets out in pressure from the pick-up pipe. Then there is the braking to slow down the basket speed step: the raising pump of the receiving tank stops, in order to allow the braking of the basket without overloading it with liquid (without centrifugation the water does not flow out anymore from the pick-up pipe of filtered liquid); the frequency converter device slows down the basket rotation main motor, following a suitable deceleration ramp. The basket reaches gradually a © Adobe Stock rotation of 30-40 RPM, the frequency converter causes a dynamic that does not centrifuge the liquid mass against the walls; the liquid descends to the centre of the basket where have been made suitable evacuation holes. In parallel, when the optimal rpm has been reached, starts the highpressure net water jet that, through a special nozzle, sprinkles a basket section suitable for the removal of the major volume of the mud collected until that moment. After connecting the pump to the pipe, it carries out a phase of powerful mud removal from the basket walls. The basket is rotating in two directions for a complete exposure of the surfaces jet. At the end of the high-pressure phase, there are still some mud traces, which are suitably rinsed through a two-times water introductions. This is an example of high technology machine applied to finishing processes made from Italian companies represented by UCIF, the Italian Manufacturers Finishing Association.
