Vibrating Cup Mill

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Posted in: , on 11. Apr. 2007 - 16:31

Who in the sample preparation lab is not familiar with the vibrating cup mill?

This principle, particularly in the areas of geology, mineralogy and all areas concerned with mineral raw materials, has enjoyed many decades of success.

However, with the development of the planetary ball mills, first patented by FRITSCH in the year 1962, the vibrating cup mill has unjustifiably lost some ground to the planetary ball mill. Yet despite this, the vibrating cup mill is absolutely the best mill for fast grinding of hard and brittle materials to analytical fineness which has led to our latest version of the FRITSCH vibrating cup mill.

With the redesigned pulverisette 9 vibrating cup mill FRITSCH introduces an instrument unique throughout the world. Through optimisation of the grinding set weights in relation to the counterweight, the mill now operates more efficiently within the resonance range. This results in a significant improvement in performance with an associated reduction in grinding time by 50% to achieve analytical fineness. The ease of cleaning is still unparalleled. The grinding set consists of only a few large parts.

But the most important aspect of the redesign was the consideration of ergonomics. Why? Because large grinding sets of hardmetal tungsten carbide weigh up to 25 kg; even the sets of tempered steel are almost too heavy to handle. The sets must be lifted into the machine in a transport rig at a working height that is uncomfortably low. In all the machines previously available on the market this was completely unacceptable which is why we considered an alternative design concept for the pulverisette 9.

The weight of the large grinding sets was minimised as far as possible. The sets are positioned on a carriage to place them into the grinding chamber of the instrument. The working height was brought to an optimal level.

Additional new innovations include:

• Completely new clamping of the set via a symmetrical eccentric device

• Increased motor power to 1.1 kW

• Optimisation of the system resonances in line with the motor characteristics so that only single-phase alternating current is required despite the increased motor power

• Increased maximum rotation speed to 1100 rpm

• Forward and reverse operation is also available

• Air cooling of the grinding chamber and the grinding set

• Grinding sets with cooling ribs and handle

• Insulated handles on the grinding sets

• The operating time can be set precisely to plus/minus one second.

The most recent example for mandatory use of the vibrating cup mill is for grinding activated carbon. Despite all our experience and trials with the planetary mill we did not achieve completely satisfactory results. Individual larger particles still remained within a very fine matrix. However, use of the vibrating cup mill yielded outstanding success.

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