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
- Output
- Fine – medium powder
- Capacity
- 10 kg/h – 25 t/h
- Motor power
- 1.5 – 200 kW
- Model range
- 6 sizes · Ø150–1200
Dynamic kinetic energy
Screen-controlled output
Free-swinging hammers on a high-speed rotor strike incoming feed, hurling it against manganese-steel breaker plates An interchangeable sieve screen sets the discharge size — anything oversize is swept back into the hammers until it passes
- Tip speed
- 100m/s
- Rotor Ø
- 150–1200mm
- Hammers
- Reversible
- Capacity
- ≤25t/h
What is a Hammer Mill?
A hammer mill is a high-speed mechanical impact pulverizer that crushes, grinds and pulverizes a wide array of materials into fine and medium-coarse powders It sits in the category of intermediate and fine comminution equipment, and — unlike pressure-based crushers — uses dynamic kinetic energy transfer rather than slow compression to fracture particles
For operators seeking a robust heavy-duty industrial hammer mill, this is the primary workhorse across the agricultural, chemical, mineral and waste-recycling industries, prized for its versatility and high-throughput capacity Every THOR-HM unit is built to a customer's process and sized after a pilot run with your actual feed material
Where Hammer Mill sits on the particle-size scale
How it works
Free-swinging hammers strike the feed, throwing it against a breaker plate and a perforated screen Particles exit only when they fit the screen — the mill self-classifies
Primary gravity feeding
Coarse material is introduced via the feed hopper and gravity-fed directly into the active grinding chamber
Dynamic primary impact
Multiple free-swinging hammers on a high-speed rotor (up to 100 m/s) strike the incoming feed, fracturing it instantly through kinetic-energy transfer
Breaker-plate attrition
Shattered particles are flung radially outward at high velocity, smashing into the heavy-duty manganese-steel breaker plates for secondary reduction
Shear & compression sifting
Material is swept across the interchangeable screen; particles below the aperture exit, while oversize is swept back into the hammers for further grinding
Main components
Five core assemblies — every one engineered for fast service and a long wear life
Rotor assembly
The core rotating shaft — balanced, carrying the hammer pins and dynamic hammer plates
Swinging hammers
High-carbon wear-resistant alloy hammers that strike the feed Reversible — extending operational life up to four times
Breaker plates
Thick, ribbed manganese-steel liner plates in the upper chamber — absorbing high-impact forces and driving secondary shattering
Interchangeable sieve screen
A curved perforated steel plate at the discharge base that determines the maximum particle size of the output
Heavy-duty casing
A split-body structural-steel chamber with hydraulic or manual assists, so operators can swap hammers or screens fast
Advantages & limitations
What the THOR-HM does exceptionally — and where the physics of mechanical impact sets a ceiling
Advantages
Maximum wear efficiency
Proprietary tungsten-carbide hard-facing overlays keep grinding edges sharp up to 300% longer than standard steel hammers
Vibration-dampened frame
A reinforced steel baseplate with isolation pads eliminates the need for expensive reinforced-foundation civil works
Optimized airflow management
Internal aerodynamics minimise turbulence — lowering motor power draw and maximising throughput per kWh
Direct air-classifier compatibility
A pre-engineered modular flange connects straight to THOR-AC classification loops — no mechanical screen needed for fine or sticky materials
Limitations to plan for
Sieve-screen limitation
As a stand-alone unit with fine screens (<150 µm), moist or greasy feeds can blind the screen — cutting throughput and overheating
High acoustic emissions
Steel-on-hard-material impact often exceeds 85 dBA, requiring acoustic insulation jackets in close-quarter factories
Thermal heat build-up
Prolonged dry milling of thermoplastic or heat-sensitive feeds can cause melting or caramelization from friction heat
Milling, mixing & bulk handling
The THOR-HM Series drops into automated plant layouts and couples cleanly to downstream conveying and classification
Pneumatic conveying loops
Configure the mill as a hammer-mill-with-cyclone system: a negative-pressure blower pulls milled powder through the screen — cooling the material and conveying it dust-free to a rotary airlock valve
Modular THOR-AC coupling
For ultra-fine minerals, remove the sieve screen entirely: unscreened output is conveyed to the THOR-AC Air Classifier, which separates fine product and returns oversize to the feed inlet in a closed loop
Specifications
Six frame sizes from bench-scale to heavy industrial Final sizing is confirmed after pilot trials with your actual feed material
| Model | Rotor diameter | Motor power | Rotor speed | Capacity |
|---|---|---|---|---|
| TH-HM-150 | Ø150 mm | 1.5 – 2.2 kW | 1500 – 4500 rpm | 10 – 50 kg/h |
| TH-HM-300 | Ø300 mm | 5.5 – 7.5 kW | 1200 – 3600 rpm | 100 – 300 kg/h |
| TH-HM-500 | Ø500 mm | 15 – 25 kW | 1000 – 3000 rpm | 500 – 1500 kg/h |
| TH-HM-800 | Ø800 mm | 45 – 55 kW | 800 – 2400 rpm | 2000 – 4000 kg/h |
| TH-HM-1000 | Ø1000 mm | 90 – 100 kW | 600 – 1800 rpm | 5000 – 10000 kg/h |
| TH-HM-1200 | Ø1200 mm | 160 – 200 kW | 500 – 1500 rpm | 15000 – 25000 kg/h |
Other platforms
The rest of the THOR family Compare or pair — air classifying is often integrated with a mill