Rotor impact mill (RPM & RPMF)

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Rotor impact mill (RPM & RPMF)

The sand maker

The BHS rotor impact mill is a high-performance crusher with a vertical shaft. The circular rotor is equipped with horseshoe-shaped impellers. This unique impeller rotor, combined with the anvil ring, achieves a very large targeted crushing ratio and an excellent particle shape. This mill can crush all lightly abrasive minerals with maximum feed particle sizes of up to 56 mm.

Operating principle (overhead view) of the rotor impact mill
Operating principle (overhead view) of the rotor impact mill

Unique crushing principle 

The impeller rotor of the BHS rotor impact mill is the only one of its kind in the world. The high circumferential speed of the rotor results in an almost permanent gap between the tips of the horseshoe-shaped hammers and the anvil ring. The small gap width and the high energy input due to the circumferential speed result in a very high, targeted crushing ratio.

Several different machine sizes are available to ensure that customer-specific requirements are optimally met. The mill is primarily used for producing high-quality sand with excellent particle shape, such as is required in the dry mortar industry.

Operating principle of the RPM (side view)
Operating principle of the RPM (side view)

Two versions of the rotor impact mill 

The RPM rotor impact mill is used in the building materials industry. The machine has been a proven and reliable tool in the production of sand for many years. The RPMF pulverizer produces even finer fractions, and the output material contains a significantly higher percentage of fine sand.

BHS rotor impact mills are not only used in the production of sand for the dry mortar industry. They have also proved themselves useful in the production of surfaces for sports facilities, as well as in the milling of fertilizers from limestone, dolomite, gypsum, anhydrite and burnt lime.

The RPFM is characterized by a higher circumferential speed and a significantly smaller milling gap. This makes the pulverizer ideally suitable for producing sand with particle sizes from 0 to 2 mm.

Layout of the rotor impact mill RPM
Layout of the rotor impact mill RPM
Layout of the rotor impact mill RPMF with rotor ring
Layout of the rotor impact mill RPMF with rotor ring

Customer trials at the BHS technical center 

At our BHS technical center in Sonthofen, we use the rotor impact mill to perform industrial crush tests on customer-specific materials in order to devise solutions that meet even the most challenging demands.

References

Two RPM 1513 rotor impact mills used for producing dry mortar sand from limestone
Two RPM 1513 rotor impact mills used for producing dry mortar sand from limestone
Use of an RPM 1113 rotor impact mill for production of high-grade crushed sand made from andesite grit
Use of an RPM 1113 rotor impact mill for production of high-grade crushed sand made from andesite grit

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