No two applications are the same. But one thing remains the same: The rotor is the heart of a shredder. It is fitted with cutting blades and rotates between 30 and 400 revolutions per minute, depending on the material and machine. The optimum coordination of rotor, knives and counter knives is decisive for the shredding result.
While the rotor cutting blades rotate, the counter blades in a shredder are firmly screwed into the base of the cutting chamber. Many variants are reversible. The cutting gap can be variably adjusted as an option. This is ideal if readjustment is required due to wear. This keeps the throughput consistently high. The choice of the right type of counter blade always depends on the material and the desired shredding result.
The cutting gap between the rotor and stator knives can be variably adjusted using adjustable counter knives. If the wear on the counter blade increases due to the increased cutting gap, it is readjusted – and the wear is reduced immediately. In addition, the flexible adjustment of the counter blade further improves the cutting result and therefore the throughput of the machine. This ensures greatly reduced sensitivity to impurities. Another plus: The counter knives can be reversed, which significantly reduces spare parts costs.
A special feature of WEIMA machines is that the broaching blade is positioned very close to the rotor seal so that the material is cut right to the very end of the rotor. This means that no non-shredded material is left behind that could get into the rotor bearings through the seal and cause damage.
Broaching blade (external) on a V-rotor