Four-Shaft Crusher

The High-Efficiency, Dual-Stage Shredder for Volume Reduction of Bulky, Tough, and Mixed Waste

The Four-Shaft Crusher is a powerful, slow-speed, high-torque shredding system designed for the primary and secondary size reduction of challenging, bulky, or mixed material streams. It features two parallel sets of cutting shafts (four shafts total) that intermesh at different speeds. The primary coarse shafts initially tear and shred large materials, which then pass to the secondary fine shafts for final sizing. This dual-stage action in one machine makes it exceptionally effective for processing pallets, packaging waste, municipal solid waste (MSW), electronic waste, and bulky organic materials that need to be reduced in volume and homogenized for further processing like composting, recycling, or energy recovery.

Four-Shaft Crusher

Key Features

  • Dual-Stage, Four-Shaft Design

    Two pairs of counter-rotating shafts with large-diameter cutting discs and ripper hooks. The first (slow) pair performs coarse shredding; the second (faster) pair provides fine grinding.

  • Slow-Speed, High-Torque Operation

    Powerful hydraulic or electric drives deliver massive torque at low rotational speeds, enabling it to tackle tough, heterogeneous materials without stalling and with low energy consumption per ton processed.

  • Interchangeable Cutting Discs & Hooks

    The cutting elements on the shafts are modular and reversible, allowing for customization based on feed material and desired output size, and easy replacement when worn.

  • Screen for Controlled Output Size

    An interchangeable screen grate located at the discharge determines the final particle size. Changing the screen aperture allows for flexibility in product specification.

  • Automatic Reversal & Overload Protection

    The drive system can automatically reverse direction to clear jams and includes overload protection to prevent damage from uncrushable objects.

Advantages

  • Unmatched Versatility for Difficult Feeds

    Handles a wider range of input materials (size, shape, composition) than single-shaft or twin-shaft shredders, including materials with metals or contaminants.

  • High Volume Reduction & Homogenization

    Significantly reduces the bulk of waste streams and creates a uniform, flaky output ideal for downstream sorting, composting (as bulking agent), or RDF (Refuse-Derived Fuel) production.

  • Low Operating Noise & Dust Generation

    The slow-speed, shearing action operates more quietly than high-speed hammer mills and generates less dust.

  • Robust & Reliable Construction

    Built with heavy-duty steel plate, massive bearings, and hardened cutting tools to withstand continuous operation in demanding waste processing environments.

  • High Throughput Capacity

    Capable of processing large volumes of material in a single pass due to its powerful size reduction action.

Applicable Raw Materials

  • Bulky Industrial & Commercial Waste

    Pallets, crates, plastic drums, tires (sidewalls), textiles, packaging materials

  • Municipal Solid Waste (MSW)

    For pre-sorting and volume reduction

  • Biomass & Organic Waste

    Large tree stumps, root balls, green waste, agricultural residues (requires specific cutting tool configuration)

  • Electronic Waste (E-Waste)

    For initial breakdown of appliances and components.

  • Light Metals

    Aluminum profiles, thin sheet metal (mixed with other waste)

Basic Structure & Components

Four-Shaft Crusher
Heavy-Duty Welded Frame

Provides the structural base for all components.

Four Shaft Assemblies

Two slow-speed primary shafts and two higher-speed secondary shafts, each mounted with cutting discs and hooks.

Cutting Chamber

The enclosed area where the shafts intermesh and material is shredded.

Drive System

Typically consists of high-torque hydraulic motors for each shaft or a combination of electric motors and gear reducers.

Hydraulic Power Unit (HPU)

If hydraulically driven, this provides pressurized fluid to the motors.

Discharge Screen Grate

A curved or flat screen that controls the final particle size.

Control Panel

Houses the PLC for controlling shaft rotation (direction, speed), reversal sequences, and safety interlocks.

Feed Hopper (often with ram)

A large hopper, sometimes with a hydraulic pusher ram to force material into the cutting zone.

Technical Data

Parameter Model FSC-1000 Model FSC-1200
Shaft Diameter / Working Width 1000 mm 1200 mm
Total Drive Power (kW) 110 – 160 160 – 250
Shaft Rotational Speed (Primary/Secondary) ~20 / ~40 rpm ~18 / ~35 rpm
Feed Opening Dimensions (mm) 1500 x 2000 1800 x 2200
Output Size (dependent on screen) 50 – 150 mm 50 – 150 mm
Throughput Capacity (t/h, for MSW) 15 – 25 25 – 40
Control System PLC with Automatic Reversal PLC with Automatic Reversal

Key Differentiators vs. Other Crushers

The four-shaft design offers true two-stage crushing in one unit, providing better size reduction control, higher throughput for bulky materials, and superior handling of mixed and contaminated feeds.

Operates at much lower speeds using shear and tear forces rather than impact, making it more suitable for ductile, stringy, or composite materials that would wrap or clog a hammer crusher. Also quieter and less dusty.

Designed for waste recycling and volume reduction, not for mineral processing. Handles large, irregular, and mixed-composition inputs that mineral crushers cannot accept.

It is the premier choice for primary size reduction in modern waste processing, recycling, and biomass preparation plants, where feed variability is high and reliable, high-volume reduction is the primary goal.