Chain Crusher

The chain crusher is an indispensable piece of pre-treatment equipment in fertilizer production and the resource utilization of organic waste, serving as a critical link between upstream and downstream processes in organic and compound fertilizer production lines. It reduces large, agglomerated fermented materials, recycled material clumps, and various other lumpy raw materials to an ideal particle size suitable for subsequent processing.

Renowned for its high crushing efficiency and stable operational performance, the chain crusher plays an irreplaceable role in the production of organic and compound fertilizers. It is capable of processing a wide range of lumpy organic raw materials—such as livestock manure (both pre- and post-fermentation) and industrial sludge—as well as chemical fertilizer raw materials like ammonium bicarbonate, ammonium chloride, and monoammonium phosphate. In organic fertilizer production lines, the chain crusher effectively breaks down large, compacted masses of fermented material and agglomerated recycled material from the granulation stage, restoring the material to a loose, granular state. In compound fertilizer production lines, it crushes large fertilizer chunks (with an average diameter exceeding 4 mm) into granular fertilizer with an average diameter of 1–4 mm. The chain crusher acts as a vital bridge connecting the fermentation or batching stages with the subsequent pulverization and granulation processes.

Component Composition and Functional Zoning

From the perspective of production technology, chain crushers can be divided into the following functional units:

(1) Feeding unit: including feeding hopper and feeding port. The material enters the crushing cavity from here. The feed port is reasonably designed to ensure smooth entry of materials.

(2) Crushing execution unit: including high-speed rotating rotor disk, chain and ring chain head. This is the core station for material crushing. The materials are crushed in the crushing chamber by the repeated impact of the chain and the collision between materials.

(3) Grading discharging unit: including discharging port and screening device. The crushed materials will be discharged from the discharge port after reaching the specified particle size.

(4) Transmission drive unit: including motor, V-belt transmission mechanism and shock absorber. Provide stable power for the crushing execution unit.

(5) Body and protection unit: including casing, lined rubber plate and quick-opening access door. Prevent material sticking and body wear, and facilitate daily maintenance.

Production Line Roles and Process Flow

The chain crusher serves as a core component of the crushing stage in organic and compound fertilizer production lines. The complete organic fertilizer production process involves: raw material pretreatment → aerobic fermentation → chain crushing → batching and mixing → granulation → drying → cooling → screening → packaging.

During the post-fermentation processing stage, the chain crusher performs a critical task: breaking down large, compacted clumps of fermented material and controlling the particle size of the crushed material within an optimal range to provide suitable feedstock for subsequent batching, mixing, and granulation. In compound fertilizer production, the chain crusher enables continuous crushing operations, thereby enhancing overall production efficiency.

The equipment integrates seamlessly with upstream and downstream machinery, such as pulverizers, batching systems, granulators, and dryers. In organic fertilizer production lines, the chain crusher is typically positioned between the fermentation discharge stage and the batching/mixing stage; in compound fertilizer production lines, it is usually located between raw material pretreatment and granulation.

Description of Crushing Processes and Stages

The crushing process of the chain crusher can be divided into the following stages:

Feeding and distribution stage: Material drops from the feed hopper into the machine casing. The material requires pre-treatment to remove hard impurities such as metal fragments and stones. The feed rate must match the equipment's rated processing capacity.

Impact crushing stage: Upon entering the crushing chamber, the material is crushed by the impact of high-speed rotating chains and by collisions between the material particles themselves. Simultaneously, centrifugal force throws the material against the inner wall of the casing, causing further breakage upon impact.

Multi-stage crushing stage: The material subsequently falls to the rotational plane of the next layer of chains for further crushing. In horizontal dual-rotor models, the material is struck by chains on one rotor and propelled toward the other rotor, where it is struck again; thorough pulverization is achieved through repeated collisions and impacts.

Discharge and classification stage: The thoroughly crushed material is discharged through the outlet at the bottom of the machine. The particle size can be adjusted by increasing or decreasing the number of chains.

Operational Guidelines and Key Control Points

Standardized operation of the chain crusher is crucial for ensuring crushing quality and equipment longevity:

Pre-start preparation: Thoroughly inspect the condition of key components, focusing on chain tension (excessive looseness causes slippage; excessive tightness accelerates wear), blade wear, and bearing lubrication. Check the casing, feed inlet, and discharge outlet for damage or material leakage, and ensure all fasteners—such as bolts and nuts—are secure. Verify that safety guards are intact.

No-load trial run: After connecting the power, start the equipment and run it without a load for 3–5 minutes; observe for smooth operation and check for abnormal noise, vibration, or jamming.

Loaded operation: Feed material continuously at a steady rate. Operators must remain on duty throughout the process, closely monitoring motor temperature (must not exceed 75°C) and bearing temperature (normal operating temperature should be below 60°C).

Shutdown procedure: Stop feeding material first, and turn off the main power only after all remaining material inside the machine has been discharged. Disconnect the power supply, display a "Do Not Switch On" warning sign, and then clear any residual material from inside the equipment.