High-speed cage crusher machine for organic compound fertilizer production lines

Product Overview

The Cage Mill (Cage Crusher) is a high-efficiency medium-to-fine crushing equipment that utilizes high-speed counter-rotating (or co-rotating) inner and outer cage frames for high-velocity impact. In the fields of fertilizer manufacturing (especially NPK compound fertilizers, organic fertilizers, and inorganic fertilizers), salt processing, and medium-hard mineral powder production, the cage mill is widely adopted as a core equipment for raw material pre-treatment and oversized return material crushing due to its non-clogging nature, uniform output particle size, and high crushing efficiency.

The cage mill is primarily composed of the machine frame, casing, inner and outer cage discs (equipped with wear-resistant pin bars), transmission system (motor, pulleys, main shaft), and feeding/discharge ports. Once materials enter the crushing chamber through the top or axial feed inlet, they are instantly pulverized by the powerful impact, shearing, and mutual collision of the high-speed rotating cage bars, and are discharged from the bottom outlet via centrifugal force.

Key Features

• Unique Structure & High Crushing Efficiency:

  Utilizes two or more sets of oppositely rotating pin-bar cage frames, allowing materials to undergo multiple high-frequency, high-energy impacts and shear forces between the cage bars for thorough pulverization and high throughput.

• Anti-Stick & Non-Clogging Performance:

  Tailored for compound fertilizer raw materials with higher moisture content or stickiness (such as mixtures containing urea and ammonium salts), the mechanical self-cleaning action of the cage bars combined with high-speed centrifugal force effectively minimizes material adhesion and drastically reduces the risk of clogging.

• Uniform Output Particle Size & Precise Control:

  With a short material residence time inside the cage chamber, the crushed particle size distribution is concentrated and over-crushing is avoided—making it especially ideal for pre-granulation preparation stages that demand strict particle sizing.

• Wear-Resistant & Easy Maintenance:

  Critical impact elements (cage bars/pin bars) are manufactured from high-manganese steel, wear-resistant alloy steel, or cemented carbide materials for exceptional abrasion resistance; the housing features an open-door design to facilitate routine inspections and fast replacement of wearing parts.

• Stable Operation & Low Vibration:

  The cage discs undergo precision dynamic and static balancing calibrations, which—when paired with a high-strength cast or welded machine base—ensure the equipment remains stable and low-noise even during high-speed operation.

Applications

The cage mill is extensively utilized for the fine-crushing operations of medium-hard, fragile, or slightly moist/sticky materials:

• Fertilizer Industry:

Crushing of single-nutrient and compound fertilizer raw materials (such as urea, ammonium chloride, ammonium sulfate, monoammonium phosphate DAP/MAP, potassium chloride, etc.).

De-caking and re-crushing of caked fertilizers.

• Organic Fertilizer & Bio-Organic Fertilizer:

Pre-crushing of dried organic materials after fermentation, livestock manure compost blocks, humic acid, straw carbon powder, etc.

• Chemical & Building Materials Powders:

Fine crushing processing of industrial salt, gypsum, limestone, kaolin, coal dust, and other medium-hard minerals.

Integrated Production Line Applications

In automated fertilizer and powder processing lines, the cage mill typically plays the critical role of raw material fine-crushing or secondary pulverization of undersized/oversized return materials:

(1) NPK Compound/Mixed Fertilizer Production Line

Position & Function: Positioned downstream of the automatic batching system and upstream of granulators (such as rotary drum granulators, disc pan granulators, or double roller extrusion granulators).

Process Flow: Various large or caked nitrogen, phosphorus, and potassium raw materials are weighed by batching scales and fed uniformly into the cage mill for high-speed impact and primary mixing, ensuring that the fineness of materials entering the granulator meets requirements (typically 40–80 mesh) to enhance granulation yield and granule strength.

(2) Organic-Inorganic Compound Fertilizer Production Line

Position & Function: Used for fine-crushing and homogenization after blending organic fermented materials with inorganic fertilizers.

Process Flow: Handles mixed materials containing certain levels of moisture and viscosity to prevent issues like large-particle encapsulation or compositional unevenness during downstream granulation.

(3) Closed-Loop Return Material Circulation System in Granulation Lines

Position & Function: Positioned downstream of vibrating screens/grading classifiers.

Process Flow: Unqualified oversized particles separated out by screening are conveyed to the cage mill for secondary fine crushing, and then recycled back into the granulation system—enabling zero-waste closed-loop production.

Summary

Driven by its physical processing characteristics of powerful impact resistance, anti-stick wear resistance, and uniform output, the cage mill stands out as an indispensable crushing solution for constructing high-yield, stable fertilizer granulation plants and powder processing facilities.