Cage Crusher

The Efficient Solution for Controlled, Low-Fines Crushing of Friable Materials

The Cage Crusher is a highly effective impact crusher designed for breaking up moderately hard, friable, and lumpy materials with minimal generation of undesirable fine particles. It operates via two counter-rotating cages or grids lined with steel bars. Material is fed into the center and is violently flung outward by the first cage, shattering against the bars of the second cage. This results in a controlled, uniform particle size ideal for pre-processing raw materials or sizing recycle streams in fertilizer production.

Key Features

  • Counter-Rotating Cage Design

    Features two high-speed cages rotating in opposite directions, creating high-impact collisions for efficient size reduction with a uniform product.

  • Adjustable Bar Spacing

    The distance between the steel bars on the cages can often be adjusted to control the final product size without needing screens in many applications.

  • Low Fines Generation

    The impact-and-attrition action is designed to break materials along natural cleavage lines, producing fewer ultra-fine particles compared to hammer mills, which is critical for maintaining granulation efficiency.

  • Simple, Robust Construction

    Consists primarily of the cages, a solid housing, and a drive system, resulting in a design that is easy to maintain and service.

  • High Capacity for its Size

    The aggressive action of the cages allows for a high throughput relative to the crusher's physical footprint.

Advantages

  • Superior Product Size Control

    Produces a more uniform, cubical product with a narrower particle size distribution, which is optimal for downstream processes like granulation.

  • Energy Efficient

    Direct impact crushing is often more efficient for friable materials than compression or grinding, leading to lower power consumption per ton processed.

  • Low Wear & Operating Costs

    When processing non-abrasive or moderately abrasive materials, wear on the cage bars is even and predictable, and replacement is straightforward.

  • Minimal Clogging

    The open design of the cages allows material to flow through easily, reducing the risk of clogging from slightly damp or clumpy feed (compared to fine screens).

  • Versatile Reduction Ratio

    Capable of achieving significant size reduction in a single stage, from lump feed to granule-sized product.

Applicable Raw Materials

  • Friable Minerals

    Phosphate rock, nitratine, and lumpy potassium salts

  • Dried Lumps & Oversize Agglomerates

    Oversized fertilizer granules, caked material from storage, and hardened recycle streams

  • Organic Materials

    Dried manure cakes, lumpy compost, and other brittle organic inputs

  • Compound Fertilizer Lumps

    Break-down of off-spec or oversized NPK compounds for recycling

Basic Structure & Components

Double-Cage-Crusher1
Heavy-Duty Housing

A welded steel enclosure that contains the crushing action and supports internal components.

Rotor Assemblies (Cages)

Two solid steel rotors fitted with replaceable steel bars or rods arranged in a cylindrical cage structure.

Drive System

Two independent motors and V-belt drives (or a single motor with a gearing system) to power the counter-rotating cages.

Feed Hopper

A centrally located inlet that directs material into the space between the two cages.

Discharge Chute

An outlet at the bottom of the housing for the crushed product to exit.

Base Frame

Provides stable support and allows for easy installation and alignment.

Access Doors

Heavy-duty doors for inspection, maintenance, and bar replacement.

Technical Data

Specification Production Capacity (t/h) Feeding size (mm) Discharge size (mm) Materiel humidity (%) Turn cage diameter (mm) Rev (r/min) Power (kW)
LFφ600 (double cage) 4 ≤15 ≤1mm (90%) ≤6 φ600/φ400 1100 11/7.5
LFφ800 (double cage) 6-7 φ800/φ630 960 22/15
LFφ1000 (double cage) 17-21 φ1000/φ830 960 37/30

Key Differentiators vs. Other Crushers

Produces a more uniform product with fewer fines due to controlled impact between cage bars, whereas a hammer crusher tends to produce a wider size distribution and more fines through pulverization. Generally more suitable for friable materials rather than very hard or tough ones.

A secondary crusher for smaller, friable feed, while a jaw crusher is a primary crusher for very large, hard, and abrasive lumps. The cage crusher operates at much higher speeds and uses impact rather than compression.

While both use impact, the Cage Crusher is better for denser, mineral-based materials and offers more precise size control. The Chain Crusher is specialized for lightweight, fibrous, and brittle organic materials.

A single-stage, dedicated impact crusher. The Two-Stage Crusher combines mechanisms (e.g., hammer+chain) for a broader application range on complex materials like organics, but may not offer the same level of controlled, low-fines crushing for standard friable minerals.

It is the preferred choice for efficient, controlled size reduction of friable fertilizers and raw materials where minimizing fines and achieving a uniform product size are critical process objectives.