Hammer mills are used for crushing, pulverizing and deagglomeration of medium-hard, hard, brittle, tough and fibrous samples.
The rugged RETSCH Hammer Mill HM 200 accepts large feed sizes up to 100 mm which can be reduced to less than 0.8 mm, depending on the sample properties.
The mill is ideally suited for processing large volumes batchwise or continuously which ensures high sample throughput. Thanks to features like rugged design, easy handling and quick cleaning, the HM 200 is equally suitable for use in laboratories or pilot plants.
HIGH THROUGHPUT & DEFINED FINAL FINENESS
This diagram shows a comparison of the Hammer Mill HM 200 with two rotor mills. The extremely high sample throughput of the HM 200 is clearly visible. The HM 200 shows a good crushing efficiency of 125, which is the value of the maximum feed size divided by the finest achievable grind size. The SR 300 and SK 300 accept a maximum feed size of 25 mm (unlike the HM 200 which accepts sizes up to 100 mm) and crush particles to a size below 0.05 mm or 0.1 mm respectively - resulting in a higher crushing ratio.
Benefits at a glance
Excellent crushing performance
Very high throughput of up to 1500 kg/h
Fixed speed of 3000 min-1
Sieve range from 2 - 40 mm
Feed size up to 100 mm, grind size < 0.8 mm
Easy access to crushing chamber facilitates cleaning
For batchwise or continuous grinding
Connector for dust extraction
USER CONVENIENCE COMBINED WITH MAXIMUM SAFETY
Easy cleaning of the rotor and the hammers thanks to
Fold-back hopper to gain access to the crushing chamber from above
Additional fold back option in the middle part of the machine allows easy cleaning of rotor and hammers from below
To ensure a long service life of the machine, even when mostly used for tough crushing tasks, the following parts can be exchanged by the user:
Wear plates inside the mill
Rotor with the swing hammers
A safety switch and the brake motor ensure that the unit comes to an immediate stop, e.g. if the door is openend unintendently
DEFINED PARTICLE SIZE THANKS TO DIFFERENT SIEVES
The achievable final fineness of the sample depends on the material's properties. Hard and brittle materials can be easily crushed in the HM 200 down to particle sizes below 0.8 mm. The range of sieves with aperture sizes from 2 mm to 40 mm allows for perfect adaption to application requirements.
Tough, fibrous, or moist samples like plastic toys, wood or humid coal can be successfully crushed in the hammer mill when choosing a sieve with medium to large aperture size.
HOPPERS AND COLLECTING SYSTEMS
The HM 200 is suitable for batchwise as well as continuous grinding and can be equipped with different hoppers and collecting systems.
Standard hopper for quick and easy feeding of large sample amounts
Batch hopper for feeding approximately 600 ml in one go with very little dust development
Standard collector for size reduction of sample amounts up to 10 l
For large volumes a collector is available which accommodates up to 30 l
Continuous operation: Use the continuous gravity outlet and a customer specific collecting system
TYPICAL SAMPLE MATERIALS
RETSCH’s powerful hammer mill is ideally suited for preliminary crushing and fine grinding of ores, granite, ceramics, quartz, slag, soil, coal, glass, cement clinker, wood, plastics, feed pellets, dry animal feed, dried herbs etc.
*depending on feed material and instrument configuration/settings
FUNCTIONAL PRINCIPLE
A hopper leads the sample material into the grinding chamber of the hammer mill.
The HM 200 is equipped with a horizontal rotating shaft on which 10 freely swinging hammers are mounted. Those hammers crush the material at high speed inside the grinding chamber. With the swing hammers in contrast to fixed hammers, the risk of blocking the machine as well as the wear is minimized. The material is crushed by impact when hit by each hammer and while bouncing inside the grinding chamber. As soon as the sample is fine enough to pass through the sieve, it falls through the gravity outlet into a collecting vessel.
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