Planetary Ball Mill PM 400
The Planetary Ball Mill PM 400 pulverizes and mixes soft, medium-hard to extremely hard, brittle and fibrous materials. Dry and wet grinding can be carried out. The high speed of 30 to 400 min-1 in combination with the very large sun wheel diameter of 300 mm guarantee extremely high fineness in a short time.
The PM 400 is a robust, compact floor model with 4 grinding stations for grinding jars with a nominal volume of 12 to 500 ml. It can grind up to 8 samples simultaneously down to the sub-micron range. In the MA-type version the PM 400 is suitable for mechanical alloying.
Application Examples
alloys, bones, ceramics, charcoal, chemical products, coal, coke, electronic scrap, fibres, glass, limestone, minerals, ores, paper, plant materials, quartz, seeds, sewage sludge, soils, waste samples, wood, ...
Product Advantages
- extreme speeds for particularly high fineness down to submicron range
- 4 grinding stations for grinding 2, 4 or 8 samples simultaneously
- grinding jars with volumes from 12 ml to 500 ml, in 6 materials
- suitable for long-term trials and continuous use
- reproducible results due to energy and speed control
- direction reversal
- programmable starting time
- power failure backup ensures storage of remaining grinding time
- 1-button operation with graphic display
- 10 combinations of grinding parameters can be stored
- measurement of input energy helps to optimize grinding parameters
- automatic grinding chamber ventilation for cooling the grinding jars
- also available with 2 grinding stations and with speed ratios of 1:-2.5 and 1:-3.
- 2-year warranty, CE-conforming
Features
| Applications | pulverizing, mixing, homogenizing, colloidal milling, mechanical alloying |
| Field of application | agriculture, biology, chemistry / plastics, construction materials, engineering / electronics, environment, glass / ceramics, medicine / pharmaceuticals, mineralogy / metallurgy |
| Feed material | soft, hard, brittle, fibrous - dry or wet |
| Size reduction principle | impact, friction |
| Material feed size* | < 10 mm |
| Final fineness* | < 1 µm, for colloidal grinding < 0.1 µm |
| Batch size / feed quantity* | max. 4 x 220 ml, max. 8 x 20ml with stacked grinding jars |
| No. of grinding stations | 4 / 2 |
| Speed ratio | 1:-2 / 1:-2.5 / 1:-3 |
| Sun wheel speed | 30 - 400 min-1 |
| Effective sun wheel diameter | 300 mm |
| Type of grinding jars | "comfort" |
| Material of grinding tools | hardened steel, stainless steel, tungsten carbide, agate, sintered aluminium oxide, zirconium oxide |
| Grinding jar sizes | 12 ml / 25 ml / 50 ml / 80 ml / 125 ml / 250 ml / 500 ml |
| Setting of grinding time | digital, 00:00:01 to 99:59:59 |
| Interval operation | yes, with direction reversal |
| Interval time | 00:00:01 to 99:59:59 |
| Pause time | 00:00:01 to 99:59:59 |
| Parameter combinations that can be stored | 10 |
| Measurement of input energy possible | yes |
| Interface | RS 232 / RS 485 |
| Drive | asynchron motor with frequency converter |
| Drive power | 1.5 kW |
| Protection code | IP 30 |
| Power consumption | ~ 2100 W (VA) |
| W x H x D closed | 836 x 1220 (1900) x 780 mm |
| Net weight | ~ 290 kg |
| Workplace related emission value | LpAeq < 85 dB(A) |
| *depending on feed material and instrument configuration/settings |
Function Principle
The grinding jars are arranged eccentrically on the sun wheel of the planetary ball mill. The direction of movement of the sun wheel is opposite to that of the grinding jars in the ratio 1:-2 (or 1:-2.5 or 1:-3). The grinding balls in the grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces. The difference in speeds between the balls and grinding jars produces an interaction between frictional and impact forces, which releases high dynamic energies. The interplay between these forces produces the high and very effective degree of size reduction of the planetary ball mill.
Subject to technical modifications and errors
