Weima’s quick-change screen for four-shaft shredders

Archiv – The new Series ZMK-X four-shaft shredders manufactured by WEIMA Maschinenbau of Ilsfeld in Germany feature a special screen changeover device for lowering the screen and pulling it out sideways. The new Series ZMK-X four-shaft shredders manufactured by WEIMA Maschinenbau of Ilsfeld in Germany feature a special screen changeover device for lowering the screen and pulling it out sideways.
This facilitates rapid, easy cleaning of the whole cutting unit/screen after shredding contaminated or aggressive materials such as hospital waste, plastic packaging with residual contents, and saline substances. Furthermore, a variety of screen configurations can be adopted to suit the specific task.
Compact in design, the Series ZMK-X four-shaft shredders are suitable for general size reduction of hollow bodies, car bumpers, etc. The screen is located below the cutting unit and is held against the machine housing from below by means of a toggle interlock, eliminating the need for screws. As a result, it can be released by one person onto a frame integrated into the machine housing, and then pulled out on rollers onto a lateral retention device with a minimum of effort, leaving the screen and the entire cutting unit easily accessible for rapid cleaning. The four-shaft shredder is deactivated by a safety limit switch once the screen is lowered. It is consequently possible to handle the screen – which weighs approximately 100 kg – even when the four-shaft shredder is mounted above conveyors.
The screen perforations measure between 15 and 80 mm in diameter, although customised screens can also be supplied. The cutting unit is available with two electric motor drives with ratings of between 18.5 kW and 30 kW. The speed of the shafts is around 23-25 RPM. The rotor shafts rest on bearings that are stepped from the machine housing; as a result, the bearings cannot be damaged by material ingress.