Industrial Metal Shredder

How it works

Metal shredders are the first stage in most recycling lines: they reduce oversized scrap to a size the downstream crushers, screens and separators can actually handle. Choosing between single, dual and four shafts comes down to what you are feeding in and how fine the output has to be.

The DS7272 dual-shaft unit shown here is the largest capacity configuration, with a 1,800 × 1,800 mm feed opening and twin 110 kW drives that keep torque stable even when one shaft meets hard material. Low rotor speed (5–25 rpm) produces high torque with far less noise than a hammer mill, and automatic torque monitoring reverses the rotors before an unbreakable object can stall them.

Blades are hardened D2 tool steel at 58–62 HRC and can be swapped between hook profiles for metals and flat profiles for softer material. Blade gap is adjusted hydraulically without dismantling the chamber, and an optional pusher ram forces bulky items into the cutting zone.

A shredder reduces size by tearing rather than cutting. Rotating shafts carry hardened blades or hammers that grab the feed, drag it against a fixed counter-blade and pull it apart along its weakest plane. Because the material is torn instead of sheared in one clean pass, shredders tolerate mixed, bulky and contaminated scrap that would stall a crusher.

Shaft count sets the character of the machine. A single shaft runs fast against a static counter-knife and relies on a screen to hold material until it is small enough to pass, which gives tight output control. Twin shafts turn slowly and counter-rotate, pulling difficult material in without a screen. Four shafts split the work between a tearing pair and a refining pair, which is how a fine output is reached at low speed and low noise.

Key features

• Single-, dual- and four-shaft configurations for different output targets
• Anti-jam reversal protects the rotors from unbreakable material
• Hardened D2 blades, 58–62 HRC, interchangeable profiles
• Hydraulic blade gap adjustment without disassembly
• Optional hydraulic pusher ram for bulky scrap

How to choose shredders

• Start from the largest single piece you will feed and the throughput you need per hour — those two numbers fix the feed opening and the drive power.
• Decide whether the downstream process needs a controlled particle size. If it does, a screened single-shaft machine is the right family; if the goal is volume reduction before further sorting, a twin-shaft machine is more tolerant.
• Check what the material does under load. Ductile aluminium and thin sheet wrap around shafts; mixed light waste bridges in the hopper. Both are solved by machine geometry and a pusher ram, not by adding power.
• Plan the wear parts before you buy: blade or hammer replacement interval, whether blades can be changed individually, and whether the cutting chamber is reachable from the top.

Technical data

Typical applications

• Large scrap yards and transfer stations
• Auto recyclers and end-of-life vehicle processing
• Industrial demolition scrap
• Bulky mixed metal and municipal waste

Specifications are indicative for the model family and are confirmed against your material in the quotation. Wear parts, power supply and control options are listed per project.

Frequently asked questions