The benchmark in mixing technology

Dry powder batch mixer

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The dry powder batch mixer (DMX) for the production of quality sand


The dry powder batch mixer (DMX) for the production of quality sand

Twin-shaft mixing technology is suitable for all formulas and offers a wide range of benefits. The mixing procedure has a significant effect on the quality of the mixture produced and the economic efficiency of the production process. Watch the video to learn more about the use of the dry powder batch mixer (DMX) at the dry-mortar plant of Rethmisch GmbH.



Consistent and reliable mixing results

  • Sophisticated design and arrangement of the mixing tools
  • Achieves a consistently high mixture homogeneity despite short mixing cycles

Gentle processing of the mixture

  • Special spiral blade mixing unit and careful material transport ensure gentle processing of sensitive components in the mixture (e.g. perlite, polystyrene or expanded clay)
  • Preservation of the grain structure of the formulation’s individual components

Compact design

  • Can be filled to a considerably higher level in comparison with other mixer systems, thus enabling the same throughput in a more compact design
  • Small dimensions facilitate use in new plants
  • A more powerful mixer can be installed in the existing space

Maintenance-friendly and robust design

  • Sturdy and durable design
  • Compact design that provides easy access for maintenance work

Residue-free DMX emptying

  • Residue-free mixer emptying by means of two large dust-tight and torsion-resistant discharge flaps

Low-residue DMX Monogate emptying

  • Low-residue emptying by means of massive, dust-tight rotary valves

Low wear

  • Minimized ratio of wearing surfaces to batch volume due to compact design and high filling level

Technical systems


Advantages of the Three-Dimensional Mixing Concept

Unlike single-shaft systems, which move the mixture to the center of the machine, the three-dimensional mixing concept of the twin-shaft batch mixer produces a more intensive exchange of materials, leading to short mixing times while consuming less energy.

Spiral mixing tools


Spiral mixing tools

  • Mixing tools arranged on each mixing shaft in the shape of an interrupted spiral
  • Two counter-rotating mixing shafts with the mixing tools overlapping in the longitudinal center of the mixer
  • Counter blades positioned at the ends of the shafts
  • Moderate circumferential speed of the mixing blades for gentle processing

Mixing principle


Mixing principle

  • Generation of a circular three-dimensional movement pattern of the entire mixture
  • Intensive material exchange in the turbulent overlap zone of the two mixing circuits
  • Optimal conversion of the energy input into intensive relative movements of the mixture
  • Total volume of material is always included in the mixing process


Sophisticated and proven drive technology

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Sophisticated and proven drive technology

Gearbox [1]

BHS worm gears boast maximum operational reliability and a long service life, even under extreme loads. The gearboxes are attached to the mixing shafts without rigid connection to the mixing trough. The selected material pairing allows the BHS worm gearbox to compensate the load changes that occur each time the mixer is filled.

Electric motor [2]

 All of our twin-shaft batch mixers are equipped with high-quality motors. They are specifically designed for the load cycles generated.

V-belt drive [3]

The power is transferred via V-belt drives. Positioning the V-belt drives on the outside of the drive provides good accessibility when performing maintenance work.

Torque support [4]

The adjustable torque support is used for the alignment of the gearboxes. It also allows the gearbox to be fastened to the mixing trough without pressure, avoiding unnecessary loads on the gearbox toothing. This special feature is an essential prerequisite for achieving a long gearbox life.

Synchronous coupling [5]

 A low-maintenance elastic coupling is installed between the gearboxes to synchronize the two mixer shafts.

Shaft seal & bearing

The mixer shafts are reliably sealed with axial face seals. The shaft bearings are mounted on bearing lanterns and are physically separated from the shaft seals. This significantly increases the operational reliability of the mixer shaft bearings.

Fluid coupling (optional)

The hydrodynamic fluid coupling prevents both mechanical and electrical load peaks. Its use is recommended in particular if unstable electricity supply conditions prevail on site. Alternatively, the mixer can be operated via a frequency converter or soft-start devices.

Mixer configuration


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Design features of DMX discharge door flaps

  • Residue-free discharge through large dual door flaps
  • Discharge door flaps cover the entire length and width of the trough
  • Solid and machined welded construction
  • Reliable and readjustable door seals, 100 mm high
  • Deflector design all around, spring loaded on the lateral side
  • Hydraulic operation

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DMX Monogate discharge gate design features

  • Rotary gate arranged over the entire length of the trough
  • Solid and machined design
  • Reliable and readjustable seals
  • Pneumatically or hydraulically operated

Lubrication Systems

Air sealing monitoring

A monitoring unit can send a signal to the plant control as part of the monitoring process for the compressed air supply to the four inner axial face seals. The current operating state is also displayed visually.

Fully automatic central lubrication

The lubrication points of the four axial face seals, the four mixer bearings and the four seals on the flap axes are automatically supplied with grease via a PLC controller and by means of a progressive distributor. The operating states recorded by the PLC central lubrication control can be transmitted to the plant control for visualization.

Temperature measurement

BHS dry powder batch mixers can be equipped with measurement devices from any major manufacturer to measure the temperature of the mixture and/or V-belts.

Plant modifications

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We have years of experience and comprehensive expertise when it comes to retrofitting existing mixing plants. The dry powder batch mixer is ideal when retrofitting in tight spaces thanks, to its compact design. As an added benefit, the use of a high-performance dry powder batch mixer can significantly increase the throughput rate of the plant. Installing a mixer with a higher performance and bigger capacity as well as adjusting the weighing system,r dosing and control system can make the plant substantially more competitive.

Options & accessories


Mixing trough cover

The dust-proofed mixing trough cover is equipped with large maintenance hatches that are opened with the aid of gas springs. A wide range of optional custom connections for feeding, venting or color and fiber addition are available upon request. Dust can be successfully removed via airbags or an active filter.

Installation in electrical terminal box

If required, all electrical wiring can be bundled in a terminal box for easy installation.

Air compensation pipe

Air compensation pipes are used to compensate the pressure fluctuations between the surge bin and the mixer.

Mixing mechanisms

The mixing tools, based on our spiral-blade mixing mechanism, are adapted to the material density, the abrasiveness of the batch ingredients and the need for residue-free emptying. All versions are attached exclusively with screws. All blades are adjustable.

Smooth mixing unit with plastic headers for mixes with bulk density > 1.4 t/m³

Smooth mixer with steel shovels for mixing materials with a bulk density < 1.4 t/m³

Smooth mixer with steel shovels for mixing materials with a bulk density > 1.4 t/m³

Mixing unit in chrome chilled cast iron design



The mixer can be equipped with agitators along the longitudinal side of the trough for the purpose of disintegration undesired agglomerations. They are very efficient due to the high filling level of the mixer, as they are in constant contact with the circulating mixture.

Technical specifications

Performance data
Type Effective volume Throughput rate Drive Processed particle size
90-second cycle time 150-second cycle time from to
DMX 1200/ 
DMX 1200 MG
1.050 l 42 m³/h 25m³/h 1 x 15 kW 1 x 37 kW 0 mm - 8 mm
DMX 1700/ 
DMX 1700 MG
1.500 l 60 m³/h 36 m³/h 1 x 22 kW 1 x 55 kW 0 mm - 12 mm
DMX 2200/ 
DMX 2200 MG
2.000 80 m³/h 48 m³/h 1 x 22 kW 1 x 55 kW 0 mm - 12 mm
DMX 2600/ 
DMX 2600 MG
2.300 l 92 m³/h 55 m³/h 1 x 30 kW 2 x 37 kW 0 mm - 12 mm
DMX 3600/ 
DMX 3600 MG
3.200 l 128 m³/h 77 m³/h 1 x 37 kW 2 x 65 kW 0 mm - 16 mm
DMX 4900/ 
DMX 4900 MG
4.400 l 176m³/h 106 m³/h 1 x 65 kW 2 x 75 kW 0 mm - 16 mm
DMX 5500/ 
DMX 5500 MG
4.950 l 198 m³/h 119 m³/h 1 x 75 kW 2 x 80 kW 0 mm - 16 mm
DMX 6500/ 
DMX 6500 MG
5.900 l 236 m³/h 142 m³/h 2 x 37 kW 2 x 90 kW 0 mm - 16 mm
DMX 7300/  1)
DMX 7300 MG 1)
6.600 l1 264 m³/h 158 m³/h 2 x 45 kW 4 x75 kW 0 mm - 16 mm

1)  Without hydraulic aggregate on the mixer (placed separately). Agitators drive power: 5.5 kW per unit (maximum six units depending on machine size).
DMX dimensions and weights
Type A B C D E Weight
DMX 1200 2.500 mm 1) 1.330mm 2.060 mm 1.400 mm 1.130 mm 5.000 kg
DMX 1700 3.720 mm 1.300 mm 2.470 mm 1.800mm 1.420 mm 6.800 kg
DMX 2200 3.720 mm 1.300 mm 2.470 mm 1.830 mm 1.420 mm 7.500 kg
DMX 2600 4.010 mm 1.565 mm 2.470 mm 1.830 mm 1.420 mm 8.600 kg
DMX 3600 4.070 mm 1.530 mm 3.000 mm 1.990 mm 1.580mm 11.700 kg
DMX 4900 4.900 mm 2.290 mm 3.000 mm 2.120 mm 1.580mm 15.000 kg
DMX 5500 4.900 mm 2.290 mm 3.000 mm 2.150 mm 1.850 mm 15.500 kg
DMX 6500 4.600 mm 2.310 mm 3.340 mm 2.200 mm 1.850 mm 18.000 kg
DMX 7300 2) 4.850 mm 2.310 mm 3.340 mm 2.280 mm 1.850 mm 18.500 kg

1) Without hydraulic aggregate on the mixer (placed separately). Agitators drive power: 5.5 kW per unit (maximum six units depending on machine size).
2) Dimensions and weights deviate for 4X drive.

Performance data for other materials available on request. All specifications apply to the standard design. Technical specifications for customized designs may differ from the data provided here. All technical specifications are subject to change due to continuous development. Subject to change without notice.
DMX Monogate dimensions and weights
DMX Monogate
Type A B C D E F Weight
DMX 1200 MG 2.670 mm 3) 1.330 mm 1.550 mm 1.470 mm 1.000 mm 1.200 mm 3.500 kg
DMX 1700 MG 3.000 mm 1.330 mm 2.040 mm 1.855 mm 1.200 mm 1.400 mm 5.600 kg
DMX 2200 MG 3.000 mm 1.330 mm 2.040 mm 1.900 mm 1.200 mm 1.400 mm 5.750 kg
DMX 2600 MG 3.250 mm 1.565 mm 2.040 mm 1.940 mm 1.200 mm 1.400 mm 6.200 kg
DMX 3600 MG 3.260 mm 1.530 mm 2.470 mm 2.040 mm 1.400 mm 1.640 mm 8.800 kg
DMX 4900 MG 4.180 mm 2.290 mm 2.470 mm 2.080 mm 1.400 mm 1.640 mm 11.400 kg
DMX 5500 MG 4.180 mm 2.290 mm 2.470 mm 2.110 mm 1.400 mm 1.640 mm 11.700 kg
DMX 6500 MG 4.670 mm 2.310 mm 2.855 mm 2.400 mm 1.650 mm 1.890 mm 15.700 kg
DMX 7300 MG 4.670 mm 2.310 mm 2.855 mm 2.400 mm 1.650 mm 1.890 mm 16.000 kg

3)  Dimensions and weights deviate for 4X drive.



Tests give certainty

Which mixer is the right one for your application? Don’t leave anything to chance. Leave it to our team of process consultants. Working together with you, our specialists will test the material and develop a tailor-made solution for you.


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Success stories

Dry powder batch mixers for the efficient production of dry building materials

April 2018
The Austrian company Baumit GmbH operates two dry powder batch mixers of type DMX for the production of dry mixtures. BHS-Sonthofen specifically adapted the machines of this series to the requirements of the dry powder industry. Compared with the previous single-shaft mixing system, the two mixers of type DMX 4900 S offer considerable advantages, including improved homogeneity despite a shorter mixing time, gentle handling of fragile components, reduced wear and lower energy consumption.


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