Shredding bulky and thick metal waste requires impact force, not just cutting. A metal hammer shredder uses massive hammers mounted on a high-inertia rotor, which strike the material with enough force to break, deform, and fragment scrap iron, car bodies, appliances, and mixed metal waste into pieces of controlled size, ready for separation and use.
A metal hammer shredder is the main shredding machine in any medium- and large-capacity metal recycling plant. The impact principle of the hammers is ideal for hard and bulky metal materials, offering high yield and a uniform output fraction. See the full range of recycling equipment and the solutions for metal recovery.
Key Advantages of a Metal Recycling Hammer Mill
• Impact shredding, breaks the material through the force of hammers mounted on a high-inertia rotor, ideal for hard and bulky metals.
• Robust, replaceable hammers, the high-wear-resistance steel hammers are replaced when worn, without changing the rotor.
• Adjustable screen for output size, the lower screen determines the fraction size; it is changed for finer or coarser fractions.
• Uniform fraction, the material comes out at a consistent size, ideal for the subsequent magnetic and eddy current separation.
• High yield, large throughput per kilowatt-hour compared with other shredding principles for hard metals.
• Densification through compaction, the impact of the hammers compacts the fraction, increasing density for transport.
• Robust construction, armored housing and a massive rotor for continuous operation in harsh conditions.
• Protection system, protection against unprocessable objects and overloading.
Technical Specifications, Metal Hammer Shredder
| Parameter | Value |
|---|---|
| Principle | Impact shredding with hammers on a high-inertia rotor |
| Feedstock | Scrap iron, car bodies, appliances, mixed metal waste |
| Hammers | High-wear-resistance steel, replaceable |
| Screen | Adjustable, determines the output fraction size |
| Rotor | Massive, high-inertia for powerful impact |
| Housing | Armored, resistant to impact and abrasion |
| Protection | Anti-overload and anti-unprocessable objects |
| Control | PLC, motor load monitoring |
| Components | CE marked where applicable |
Applications for a Scrap Iron Hammer Shredder
A metal hammer shredder is used in scrap iron recycling centers, in auto dismantling plants, and in units that process bulky metal waste. The impact principle is ideal for materials that require breaking and deformation, not just cutting: car bodies, appliances with steel casings, and structural scrap iron are processed efficiently through the force of the hammers.
Metal waste management is regulated at the European level; a metal hammer shredder delivered in Europe is designed in line with the requirements of Directive 2006/42/EC on machinery. For integration into a complete metal recycling flow, see also the complete industry solutions.
The uniform fraction produced is a decisive advantage for subsequent processing: magnetic and eddy current separators work most efficiently on material of a consistent size. The adjustable screen produces a calibrated fraction, optimizing the yield of separating ferrous and non-ferrous metals in the following stages of the recycling plant.
The replaceable hammers are an important practical element: they wear in contact with hard and abrasive metals, but they are replaced individually when they reach the wear limit, without changing the whole rotor. This keeps the maintenance cost predictable and allows continuous operation over long periods between major overhauls.
Densifying the fraction through the impact of the hammers is an often underestimated benefit: the material comes out of the shredder more compact than it went in, which increases the density for transport. Bulky scrap iron takes up a lot of space in transport; the shredded and compacted fraction reduces the transport cost per ton to smelters or to the separation stage.
The protection system is essential for safe operation: mixed metal waste can contain unprocessable objects (massive forged steel parts, pressurized containers) that would damage the hammers or the rotor. The anti-overload and unprocessable-object ejection protection systems protect the equipment and allow the processing of metal waste of unknown composition.
Processable Materials
| Material | Notes |
|---|---|
| Structural scrap iron | Profiles, sheets, steel components |
| Car bodies | After pre-treatment in accordance with ELV |
| Large appliances | Steel casings, after degassing |
| Metal drums and containers | Empty, free of hazardous residues |
| Mixed metal waste | Ferrous and non-ferrous fractions |
How It Works
1. The metal waste is fed into the shredding chamber of the shredder.
2. The high-inertia rotor spins the hammers at high speed.
3. The hammers strike the material, breaking and deforming it through impact.
4. The fragmented material passes through the lower screen when it reaches the set size.
5. The calibrated fraction is discharged onto a conveyor toward the separation stage.
6. The protection system ejects unprocessable objects and prevents overloading.
The PLC system monitors the motor load and signals anomalies. A correctly operated metal hammer shredder produces a uniform fraction at a constant throughput, optimizing the subsequent separation stages and maximizing the yield of the metal recycling plant.
Frequently Asked Questions
What is the difference from a knife shredder?
A metal hammer shredder shreds through impact (striking), ideal for hard and bulky materials that require breaking and deformation. A knife shredder cuts the material, better suited to materials that are easy to cut. For scrap iron, car bodies, and structural metals, the hammer principle is more efficient and more robust.
How often are the hammers replaced?
The lifespan of the hammers depends on the type and abrasiveness of the material processed and on the volume. The hammers are inspected periodically and replaced individually when they reach the wear limit. Replacement is a planned maintenance operation, without changing the whole rotor.
What fraction size does it produce?
The output fraction size is determined by the lower screen, which is adjustable. For finer fractions, a screen with smaller openings is fitted; for coarser fractions, a screen with larger openings. The size is chosen according to the requirements of the subsequent separation stage.
Can it process car bodies?
Yes, after pre-treatment in accordance with ELV regulations (removal of fluids, tires, battery). A shredder of appropriate capacity processes the pre-treated bodies, breaking them through impact into fractions processable for the subsequent separation of ferrous and non-ferrous metals.
Why URSTAG?
URSTAG is a premium brand of recycling equipment, with over 15 years of experience. You don't just get a machine, you get a solution engineered by specialists, built from top-tier components and backed by a team that supports you from design through commissioning.
• European engineering, every machine and every complete line is designed by our engineering teams in Europe, with a focus on reliability, safety and energy efficiency.
• Premium components, we build on motors and automation from industry leaders: Siemens, Schneider Electric, ABB, WEG, SEW-Eurodrive, NORD Drivesystems and Bonfiglioli.
• Over 15 years of experience, we know how materials and machines behave in real-world operation, and we configure each solution for your flow and volume.
• New equipment, configured for you, we supply new units, made to order for your application, with complete technical documentation.
• Delivery, installation and training included, we handle transport, commissioning and operator training, with support throughout the equipment's life.
As a premium brand, URSTAG relies on European engineering, top-tier components and experience. You choose a partner that supports your production long term, with equipment built to run reliably in demanding industrial environments.
