Centrifugal Galvanizing Line
Feature 1: The galvanizing area of the production line is operated by robots, which is efficient, stable, and ensures quality while eliminating the unsafe factors of high-temperature operation.
Feature 2: With the online centrifugal technology, which completes zinc basket grabbing, centrifugal and direct excess zinc collection to reduce oxidation rate and quick reuse of excess zinc.
Feature 3: Movable galvanizing platform, which facilitates operations such as dross cleaning, site cleaning, and equipment maintenance while integrating a three-station turntable, centrifugal equipment, and galvanizing fume collection hood to achieve high efficiency and low consumption.
Feature 4: The production line achieves online completion of data collection of product information, location information, zinc consumption, and equipment operating parameters through the incorporation of information technology and digital technology, enabling the off-machine operation to ensure safety and minimize production costs.
Fully Automated & Informationized HDG Centrifugal Plant for Standard Parts
The Centrifugal Hot-Dip Galvanizing Line is an automated surface treatment system for small steel components, combining hot-dip galvanizing’s corrosion resistance with high-speed centrifugal zinc removal. Ideal for mass-producing fasteners, pipe fittings and small hardware, it boosts efficiency/consistency and solves traditional issues like thread blockage and hole zinc accumulation.
1. Equipment Overview
Integrates automatic loading, pretreatment, preheating, fluxing, galvanizing, centrifugal spinning, cooling and unloading into a continuous workflow. Core innovation: High-speed rotation generates centrifugal force to remove excess molten zinc post-zinc bath, ensuring smooth surfaces, clear threads and unobstructed bores for bulk-processed small complex parts.
2. Core Process Flow
1. Pretreatment: Degreasing, pickling, rinsing and fluxing to remove oils/oxides for optimal zinc adhesion.
2. Drying & Preheating: Preheat to 200–300°C to prevent splashing/thermal shock and reduce zinc consumption.
3. Hot-Dip Galvanizing: Immerse in ~450°C molten zinc for 10–60s, forming a dense Fe-Zn alloy layer + pure zinc coating.
4. Centrifugal Spinning: Defining step—spin at 800–2500 rpm post-zinc bath to expel excess zinc from threads/blind holes, controlling coating thickness and preserving dimensions.
5. Cooling & Post-Treatment: Air/water cooling to solidify coating; optional passivation/oiling to prevent white rust.
6. Automatic Unloading: Finished parts conveyed to collection bins for inspection/packaging.
3. Key Technical Features
• Efficient Batch Processing: Handles 10–100+ kg per cycle, suitable for high-volume standardized production.
• Precise Zinc Control: Centrifugal force ensures uniform coating without clogging, meeting fastener dimensional tolerances.
• High Automation: PLC + HMI control for parameter setting/monitoring; supports data logging and fault diagnostics.
• Eco-Friendly & Energy-Saving: Insulated zinc kettle reduces energy loss; fume filtration and flux regeneration align with green standards.
• Modular Configuration: Single/multi-station setups; integrable with pretreatment/packaging lines for smart manufacturing.
4. Suitable Product Range
Ideal for small metal components; not recommended for large/thin-walled/precision-mating parts (risk of deformation):
• Fasteners: Bolts, nuts, washers, self-tapping screws
• Pipe Fittings: Couplings, elbows, flanges, valve bodies
• Small Structural Parts: Clamps, brackets, chain links
• Electrical Hardware: Cable clamps, suspension hooks, U-bolts
5. Advantages vs. Conventional Hanging Galvanizing
Comparison Item | Centrifugal Type | Hanging Type |
Suitable Parts | Small, high-volume | Large, irregular |
Thread/Hole Treatment | Clean, no blockage | Prone to zinc buildup; manual cleaning needed |
Coating Uniformity | Good (centrifugal control) | Excellent (free-hanging) |
Labor Cost | Low (high automation) | High (manual operations) |
Production Efficiency | High (100s kg/hour) | Moderate-low (slow cycles) |
6. Typical Technical Specifications (Reference)
• Zinc kettle capacity: 1–10 tons; Operating temperature: ~450°C (adjustable)
• Centrifuge speed: 800–2500 rpm (stepless variable); Load per basket: 20–150 kg
• Cycle time: 60–180s/basket; Control system: PLC + HMI
• Coating thickness: 20–80 μm (adjustable)
7. Application Industries
• Power T&D: Grounding clamps, electrical connectors (weather-resistant)
• Construction: Fasteners, brackets (long-term corrosion protection)
• Automotive: Small underbody/engine components
• Petrochemical: Valves, couplings (corrosive environment resistance)
• Agricultural Machinery: Small parts (cost-effective durability)
With high efficiency, reliability and eco-compliance, it’s the preferred corrosion protection solution for small parts, enabling high-quality, low-cost smart production.
