1. Overview
With the rapid development of intensive aquaculture, the demand for high-quality aquatic feed—characterized by good water stability, high digestibility, and uniform nutrition—has surged. The Ring Die Aquatic Feed Pellet Mill is a core piece of equipment engineered for large-scale production of premium aquafeed pellets. It processes easily accessible raw materials (corn, wheat bran, rice husk, soybean meal, etc.) into smooth, dense pellets that are highly palatable and digestible for fish, shrimp, and other aquatic organisms. Leveraging advanced technology and robust performance, it has become the cornerstone of modern aquafeed production lines in large feed factories and intensive aquaculture bases.
2. Product Introduction
The Ring Die Aquatic Feed Pellet Mill (focusing on the SZLH series) is designed exclusively for large-scale, industrial-grade aquafeed production. As the core component of an automated feed pellet line, it integrates high-precision transmission, multi-stage conditioning, and intelligent control to ensure consistent pellet quality and efficient output.
Its adaptability spans a wide range of aquatic species: from small-sized pellets (2mm) for fry to large-diameter pellets (10mm) for adult fish/shrimp. Whether producing floating, sinking, or slow-sinking feed, the machine meets the strict nutritional and physical requirements of modern aquaculture, helping producers reduce feed waste and improve aquaculture efficiency.
3. Core Features
3.1 Multi-Layer Conditioning for Superior Pellet Quality
Adopting a 2 or 3-layer jacket conditioner, the machine fully cooks raw materials with steam (130-150℃, 0.1-0.4Mpa). This process gelatinizes starch in grains, enhances nutrient absorption, and improves pellet water stability (≥20 minutes)—critical for preventing nutrient leaching in water and reducing water pollution.
3.2 High-Precision Gear Transmission for Efficiency
The main drive system uses high-precision gears instead of traditional belt drives, increasing production capacity by 20% while reducing energy consumption. Paired with imported SKF bearings and NAK oil seals, it ensures smooth transmission, low noise (≤90dB(A)), and stable operation even under long-term heavy loads.
3.3 Customizable Ring Die for Versatility
Multiple ring die apertures (2mm-10mm) are available to match different aquatic species and growth stages. The ring die itself features an advanced manufacturing process, with high wear resistance and a long service life—ensuring pellets are smooth, dense, and have a shaping rate of ≥95%.
3.4 Intelligent Feeding & Safety Protection
The feeding device is equipped with a frequency conversion speed-regulating motor, which precisely controls material supply to avoid uneven pelleting caused by overfeeding or underfeeding. Additionally, the machine integrates overload protection and a full-electrical control system to automatically shut down in case of jams or overloads, protecting core components (gears, motor) from damage.
3.5 Compact & Reliable Structure
The international advanced spring coupling device features a novel, compact design that enhances safety and reliability while lowering failure rates. The roller working temperature is controlled below 85℃, preventing material scorching and extending equipment lifespan.
4. Aquafeed Pelleting Process (Automated Production Line)
The Ring Die Aquatic Feed Pellet Mill is part of a fully automated production line, with the following key steps:
- Raw Material Crushing: Use a hammer mill to grind grains, soybean meal, and other raw materials into fine powder (20-40 mesh) for uniform pelleting.
- Material Mixing: Blend the crushed powder with additives (vitamins, minerals, aquatic probiotics) in a mixer to ensure balanced nutrition.
- High-Temperature Conditioning & Pelleting: The mixed powder enters the pellet mill’s multi-layer conditioner, where it is fully cooked with steam. The ring die and pressure rollers then extrude the material into pellets, which are cut to the desired length.
- Cooling & Screening: Freshly produced pellets (high temperature and moisture) are cooled to room temperature in a cooler, then screened to remove broken particles.
- Packaging: Qualified pellets are automatically weighed and packaged for storage or distribution.
5. Maintenance & Repair Guidelines
Proper maintenance ensures stable operation and extends the machine’s service life. Follow these key tips:
- Regular Wear Part Inspection: Check the ring die, pressure rollers, and cutter periodically. Replace worn parts promptly to avoid affecting pellet quality and production efficiency.
- Scheduled Lubrication: Change the gearbox lubricating oil at specified intervals (per the user manual) to reduce friction and protect the transmission system.
- Avoid Overloading: Strictly adhere to the rated capacity (2-20T/H, depending on the model). Overloading can damage the motor and reduction gear—shut down immediately if overloading occurs and repair broken parts.
- Adjust Die-Roller Gap: Regularly calibrate the gap between the ring die and pressure rollers (typically 0.1-0.3mm). An improper gap can cause violent vibration, damaging transmission components and bearings.
- Post-Operation Cleaning: Clean the conditioner, pelleting chamber, and ring die holes after use to prevent residual material from hardening and blocking the equipment.
6. Why Choose Our Ring Die Aquatic Feed Pellet Mill?
6.1 Professional Design for Aquafeed Needs
Our exclusive multi-layer jacket conditioner addresses the high requirements for aquatic feed digestion and water stability, ensuring pellets meet the nutritional needs of fish and shrimp.
6.2 Reliable Quality & Certification
With 12 years of industry experience and CE certification, our equipment undergoes rigorous quality testing to ensure compliance with international standards.
6.3 Customization & Comprehensive Service
We offer customized solutions (e.g., ring die aperture, motor power) based on your production scale and aquatic species. Additionally, we provide a 2-year warranty and a dedicated after-sales team for on-site guidance, maintenance, and spare part supply.
7. Technical Data
| Model No. | Capacity | Main Motor Power | Screw Feeder Power | Conditioner Power | Ring Die Inner Diameter | Ring Die Rotational Speed | Roller Outer Diameter | Dimensions (L×W×H) |
|---|---|---|---|---|---|---|---|---|
| SZLH320 | 2-5T/H | 37KW | 0.55KW | 2.2KW | 320mm | 305PRM | 140mm | 2300×1000×2100mm |
| SZLH350 | 1.5-8T/H | 55KW | 0.75KW | 2.2KW | 350mm | 336PRM | 165mm | 3200×1100×1700mm |
| SZLH400 | 2-10T/H | 75/90KW | 0.75KW | 2.2KW | 400mm | 307PRM | 190mm | 3200×1300×1900mm |
| SZLH420 | 3-12T/H | 110KW | 1.5KW | 5.5KW | 420mm | 287PRM | 206mm | 3500×1500×2800mm |
| SZLH508 | 4-20T/H | 132/160KW | 1.5KW | 7.5KW | 508mm | 287PRM | / | 3500×1500×2950mm |
Common Parameters:
- Pellet Diameter: 2mm, 3mm, 4mm, 4.5mm, 5mm, 6mm, 8mm, 10mm
- Pellet Shaping Rate: ≥95%
- Pellet Stability in Water: ≥20Min
- Noise: ≤86dB(A) (small models) / ≤90dB(A) (large models)
- Roller Working Temperature: ≤85℃
- Steam Working Pressure: 0.1-0.4Mpa
- Steam Temperature: 130-150℃