Hammer Mill

Hammer mills are used for crushing, pulverizing and deagglomeration of medium-hard, hard, brittle, tough and fibrous samples.
The Hammer Mill accepts large feed sizes up to 100 mm which can be reduced to less than 0.8 mm, depending on the sample properties.

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 opened unintentionally.

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 Hammer mills 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.

Hammer Mill Hoppers and Collecting Systems

The Hammer Mill 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
• Long stock hopper beneficial for feeding elongated particles
• Standard collector for size reduction of sample amounts up to 10 L
• Collector for large volumes accommodating up to 30 L
• Continuous operation using gravity outlet and a customer-specific collecting system

Functional Principle

A hopper leads the sample material into the grinding chamber of the hammer mill.
The Hammer Mill is equipped with a horizontal rotating shaft on which 10 freely swinging hammers are mounted. These hammers crush the material at high speed inside the grinding chamber. With swing hammers, in contrast to fixed hammers, the risk of blocking the machine as well as 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.

Applications :

• coarse and pre-crushing, desagglomeration

Field of application :

• agriculture, chemistry / plastics, coal, construction materials, engineering / electronics, environment / recycling, food / feed, geology / metallurgy, glass / ceramics

Feed material :

• medium-hard, hard, brittle, tough, fibrous

Size reduction principle :

• impact, shearing

Material feed size :

• < 100 mm

Final fineness :

• < 0.8 mm

Batch size / feed quantity :

• up to 30 l depending on collecting receptacle

Speed at 50 Hz (60 Hz) :

• 3000 min-1 (3500 min-1)

Throughput :

• 1500 kg/h

Rotor peripheral speed :

• 31.4 m/s

Rotor diameter :

• 200 mm

Types of rotors :

• 10 swing hammer

Dry grinding :

• yes

Wet grinding :

• no

Cryogenic grinding :

• no

Material of grinding tools :

• hardened steel 1.0503 (hammers); steel 1.0330 (sieves)

Sieve sizes :

• 2 / 3 / 4 / 5 / 6 / 8 / 10 / 15 / 40 mm

Dust extraction unit :

• yes

Process line version :

• yes

Collector capacity :

• 10 l, 30 l, continuous outlet

Drive :

• 3-phase motor

Drive power :

• 1.5 kW

Electrical supply data :

• different voltages

Power connection :

• 3-phase

Protection code :

• IP 54

W x H x D closed :

• 700 x 1570 x 750 mm

Net weight :

• ~ 150 kg

Standards :

• CE