LMPBM1000 Planetary Ball Mill
For rapid fine crushing of soft, hard, brittle and fibrous material to end fineness < 1 µm
The LM PBM laboratory planetary ball mill is universally applicable for quick dry or wet grinding of inorganic and organic samples for analysis, quality control, materials testing and mechanical alloying.
In synthesis, the LM PBM can be used for mixing and homogenization of dry samples, of emulsions and of pastes.
LAARMANN® Planetary Ball Mills consist of several cylindrical grinding jars (positioned on the sun wheel as shown on the figure) which are filled with loose grinding balls. Two superimposed rotational movements move the grinding jars.
Like in a planetary system the grinding jar rotates on an orbit around the centre. This rotational movement is the self-rotation of the grinding container superimposed. The resulting centrifugal and acting acceleration forces lead to strong grinding effects.
Depending on the speed ratio different movement patters of the grinding balls / media can be achieved. It can be achieved that the grinding media are crossing the grinding jar and loosen from the wall.
At hitting the wall of the grinding jar the sample will be stressed. At a different motion pattern the grinding balls roll over the sample and stress the ground material.
Features and Benefits
- High efficient fine grinding up to end fineness <1µm
- Different speed ratios available
- Grinding jars from 50ml to 500 ml in different materials
- Suitable for long-term trials and continuous use
- Suitable benchtop placement because of it's compact desing
- Automatic direction reversal to avoid agglomerations
- Reproducible results due to programmable grinding parameters
- CE - certified
Technical Specifications
| Applications | Crushing and blending materials, achieving uniform mixtures, producing colloids through fine milling, combining metals mechanically, initiating solid-state reactions, reducing particles to the nanoscale, and screening for co-crystal formations. |
| Application fields | agriculture, biology, chemistry, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics, medicine / pharmaceuticals |
| Working principle | Impact / friction / shear / compression / attrition |
| Process materials | dry, wet, cryogenic - hard, soft, birttle and fibrous |
| Feed size | < 10 mm |
| Batch size / feed quantity | max 4 x 220ml / 8 x 20ml when stacked |
| End fineness | < 1µm; < 0,1µm for colloidal grinding |
| Speed setting | 30 - 425 min-1 |
| Speed ratio | 1:-2 / 1:-2.5 / 1:-3, determine at order |
| Sun wheel speed | 50-650 min-1 |
| Setting adjustment method | digital control panel |
| Amount of grinding jar positions | 1-4 |
| Number of grinding jars | 1-8 |
| Consumable material/material of grinding tools | Hardened steel, agate, silicon nitride, stainless steel, zirconium oxide, aluminum oxide, tungsten carbide others on request |
| Jar coating | available on request |
| Consumable sizes/grinding jar sizes | 12 ml / 25 ml / 50 ml / 80 ml / 125 ml / 250 ml / 500 ml |
| Stackable grinding jars | 12 ml / 25 ml / 50 ml / 80 ml |
| Grinding ball sizes | 0,1 - 50mm |
| Power supply | 200-240 V 50/60 Hz |
| Central lubrication | yes, single point |
| Electrical requirements | 0.75 kW |
| Power connection | 1 phase |
| Standard | CE |
| Protection code | IP40 |
| Weight | 95kg |
| Dimensions (width x length x height) | 759 x 480 x 548 mm |
Planetary ball mill working principle
The planetary ball mill is a grinding machine that is widely used in laboratories for fine grinding and mixing of materials. It is named for its unique design, which involves a central sun gear around which multiple smaller grinding jars rotate, much like planets orbiting around the sun. This setup creates highly efficient grinding by combining the rotational movement of the jars with the spinning action of the mill itself.
The planetary ball mill features a central sun wheel or disk, which is the primary rotating component of the mill. This sun wheel drives the grinding jars and is connected to a motor that powers the rotation.
The speed of the sun wheel's rotation can be adjusted to control the grinding process.
Surrounding the sun wheel are several grinding jars, typically two, four, or more, depending on the model.
These jars are the "planets" in the system, and they rotate around the sun wheel while simultaneously spinning on their own axes.
The jars are made of materials like stainless steel, tungsten carbide, or zirconia, depending on the hardness and chemical compatibility required for the grinding process.
Each jar contains grinding media, such as balls made of the same material as the jar, which are used to crush and grind the sample material.
The grinding media inside the jars are typically small balls made from hard materials like stainless steel, ceramic, or tungsten carbide.
The size and number of these balls can vary depending on the desired fineness of the final product.
The media create a powerful grinding action by rolling and cascading inside the rotating jars.
Samples to be ground are placed inside the grinding jars along with the grinding media.
The jars are then securely closed with lids, ensuring that no material escapes during the grinding process.
The planetary motion is characterized by the jars rotating around their own axes while they orbit around the sun wheel.
This counter-rotating movement creates high-energy impacts between the grinding balls and the sample material, leading to efficient size reduction and mixing.
The combination of centrifugal and Coriolis forces generated by the planetary motion results in very fine and uniform grinding.
How it works
The sample material, along with the appropriate grinding media, is loaded into the grinding jars. The jars are then sealed tightly to prevent leakage during grinding.
The operator sets the desired grinding parameters, including the rotation speed of the sun wheel, the duration of grinding, and any interval settings for pulse grinding. The direction of rotation can also be reversed to optimize the grinding process.
Once the parameters are set, the planetary ball mill is started. The jars rotate around their own axes while simultaneously orbiting the central sun wheel. This dual movement creates intense grinding action inside the jars.
The grinding media inside the jars are subjected to high-energy impacts, which result in the crushing, grinding, and mixing of the sample material.
The planetary motion produces a high degree of energy transfer to the sample material, leading to rapid and efficient size reduction. The process is highly effective for producing very fine powders, down to the micron or even nanometer scale.
In addition to grinding, the planetary ball mill can also be used for mechanical alloying, mixing, homogenizing, and even for chemical reactions in the solid state.
After the grinding cycle is complete, the machine is stopped, and the jars are carefully removed. The finely ground material is then retrieved from the jars for further analysis or processing.
In a materials science laboratory, a planetary ball mill might be used to grind a mixture of metal powders to create a new alloy.
The high-energy impacts generated by the planetary motion efficiently reduce the particle size of the powders and promote the formation of a homogenous alloy. After grinding, the fine powder is retrieved and can be further processed, such as by sintering, to create the final alloy material.
Control Panel
The planetary ball mill is equipped with a control panel that allows the user to adjust parameters such as the rotation speed of the sun wheel, the rotation direction, grinding time, and interval settings. Some advanced models offer programmable features for automated operation. The control panel may include digital displays and safety features such as emergency stop buttons and overload protection.
Safety Features
To ensure safe operation, planetary ball mills are designed with various safety features, including secure jar clamping mechanisms, protective covers, and systems to prevent accidental operation.
LM-PBM1000 Planetary Ball Mill FAQ (Frequently Asked Questions)
Applications
- Used for the fine grinding of hard, brittle, and fibrous materials. It is ideal for preparing samples for X-ray diffraction, electron microscopy, and other analytical techniques.
- Employed in the production of nanoparticles, where very fine particle sizes are required.
- Used for the homogenization of active ingredients and excipients, and for the production of fine powders for tablet formulation.
- Used in the development of new materials by alloying metallic powders through high-energy grinding.
- Ideal for grinding and mixing ceramics, pigments, and chemical compounds.
Visit our Applications page for our database of specific applications