Hammer Mill — the workhorse of size reduction.
Swing-hammer rotor with hardened tip carriers and screen-controlled discharge. The most forgiving platform in the THOR line — built for tonnage and seasonal duty.
- Range
- 200 µm – 5 mm
- Throughput
- 2 – 25 t/h
- Power
- 30 – 250 kW
- Wear
- Hardened steel · WC
Forgiving on feed.
Predictable on output.
The Hammer Mill accepts the widest feed envelope in the THOR family — chunks up to 100 mm, mixed moisture, occasional tramp. The perforated screen below the rotor sets the discharge size; everything above target stays in until it's not.
- Tip speed
- 110m/s
- Rotor Ø
- 1200mm
- Hammers
- 32 – 96
- Screens
- 0.5 – 50mm
What it is.
The THOR Hammer Mill sits in the coarse range of the size-reduction portfolio. Sized, fabricated and supported by CI, it shares the same control architecture as every other THOR platform — so commissioning, training and spare-parts strategy stay unified across your floor. Every unit is built to a customer's process: rotor selection, materials of construction, atmosphere and classifier configuration are all specified after a pilot run with your actual feed.
Where Hammer Mill sits on the particle-size scale
How it works.
Free-swinging hammers fixed to a rotor strike incoming feed at tip speeds up to 110 m/s, throwing it against a perforated screen. Particles exit only when they fit the screen aperture — a self-classifying coarse mill that is forgiving of moisture, fibre and tramp metal.
THOR Hammer Mill — Series HM
- 1Feed inletRaw material drops via gravity from upstream hopper.
- 2Breaker plateFirst-strike anvil; replaceable Hardox liner.
- 3Rotor shaftDirect-driven, dual-pillow-block, dynamically balanced.
- 4Swing hammersFree-pivoting, retract on tramp impact, hardened tips.
- 5Perforated screenSets discharge size — swap in minutes for SKU changes.
- 6DischargeSized product exits to receiver, classifier or bagging line.
The process in four steps
Feed enters
Material falls into the grinding chamber through the top inlet. Feed rate is controlled by an upstream rotary valve.
Impact & shatter
Hammers spinning at 110 m/s strike feed, throwing it against the breaker plate. Brittle materials fracture instantly.
Screen & retain
Particles smaller than the screen aperture pass through. Anything oversize stays in the chamber for more impact.
Discharge
Sized product falls into the discharge chute and is conveyed to the receiver — classifier, hopper or bagging line.
Specs envelope.
Rotor 600 / 900 / 1200 mm. Motor 30 – 250 kW. Throughput 2 – 25 t/h. Final sizing is set after pilot trials with your actual feed material. Materials of construction: mild steel, SS304 or SS316L for hygienic / corrosive duties.
| Parameter | HM-600 | HM-900 | HM-1200 |
|---|---|---|---|
| Rotor diameter | 600 mm | 900 mm | 1200 mm |
| Tip speed | 85 m/s | 95 m/s | 110 m/s |
| Hammer count | 32 | 64 | 96 |
| Screen aperture | 0.5 – 30 mm | 0.5 – 40 mm | 0.5 – 50 mm |
| Motor power | 30 – 75 kW | 90 – 160 kW | 160 – 250 kW |
| Throughput | 2 – 6 t/h | 5 – 14 t/h | 12 – 25 t/h |
| Feed size (max) | 60 mm | 80 mm | 100 mm |
| Materials of construction | Mild steel · SS304 · SS316L (food/pharma) | ||
Where it earns its keep.
The THOR Hammer Mill is the platform we most often deploy for the materials below. Each has a documented pilot run, particle-size distribution and energy profile — ask us for the report.
Other platforms.
The rest of the THOR family. Compare or pair — air classifying is often integrated with a mill.