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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Downloads

“Rotor impact mill (RPM & RPMF)” brochure (PDF / 1.0 MB)
“Rotor impact mill (RPM & RPMF)” brochure

Product brochure for rotor impact mill (RPM & RPMF)

Size: 1.0 MB
Technical data sheet “Rotary impact mill (RPM & RPMF)” (PDF / 180 KB)
Technical data sheet “Rotary impact mill (RPM & RPMF)”

Technical data about the rotary impact mill (RPM & RPMF)

Size: 180 KB

Advantages

  • Unique operating principle
  • High crushing ratio
  • Selective crushing effect
  • Easy maintenance

Applications

BHS crushing technical center

Link to tests at BHS technical center

Technical article

More efficient crushed sand production

AT MINERAL PROCESSING
Europe 7-8 / 2016
August 2016
PDF (623 KB)
More efficient crushed sand production

BHS-Sonthofen introduced their new rotor impact mill of type RPMF at bauma 2016. The new RPMF machines produce even finer fractions as well as output material with a significantly higher proportion of fine sand. As such, machines of this type are more efficient in producing crushed sand.

Size: 623 KB

Rotor impact mills for the production of sand for dry mortar successful in Thailand

ZKG INTERNATIONAL
Drymix Mortar Special 2016
June 2016
PDF (261 KB)
Rotor impact mills for the production of sand for dry mortar successful in Thailand

The BHS rotor impact mills of type RPM are becoming more and more popular for the production of sand for dry mortar. They have become the standard in certain countries for the production of extraordinarily fine sand.

Size: 261 KB

Brought into line - Rotor crushers for the production of sand and fine sand

AT MINERAL PROCESSING
11-2009
November 2009
PDF (641 KB)
Brought into line - Rotor crushers for the production of sand and fine sand

For the production of sands for the construction materials industry BHS Sonthofen has developed special rotor crushers, which depending on crushing requirements and the application range of the sand product can process soft, medium-hard to hard and wear-intensive rock. At the company's test centre original machines are available for conducting test series. The following paper describes the principle of operation of BHS rotor crushers and presents different examples of crusher performance with reference to screening curves.

Size: 641 KB
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