Steel Pipe Hot-Dip Galvanizing Line

I. Fully Enclosed & Automated Pretreatment System

Fully enclosed design with automated RGVs and smart fixtures; operators avoid acid zones, enhancing safety and environmental performance. Unmanned workflow (1 operator for initial loading only):

● RGV #1: Delivers empty fixture to heavy-duty station; transfers steel pipes to low/high-acid tanks for rust removal; returns empty fixture to feeding area.

● RGV #2: Moves pipes from high-acid tank through 2 rinsing tanks to fluxing zone; auto belt-changer transfers pipes to overhead conveyor.

● RGV #3: Transports fluxed pipes to galvanizing entry area.

● Benefits: Reduced labor/acid/energy consumption; minimized chemical waste/emissions; low-cost, stable, eco-friendly operation.

II. Intelligent Galvanizing & Post-Treatment Unit

After drying, pipes are auto-conveyed to galvanizing machine. Post zinc bath immersion, key processes activate:

● Blowing System: High-pressure air (external) controls outer coating thickness; compressed air/steam (internal) removes excess zinc (unobstructed passages).

● Subsequent Processes: Air cooling + water quenching (zinc layer solidification) → optional chrome-free passivation (enhanced corrosion resistance) → secondary drying (moisture removal) → laser marking (specs, batch numbers) → robotic stacking/packaging (preset quantities, auto bundling, transfer to discharge buffer).

III. Smart Management & Green Support Systems

1. Auxiliary Systems

● Spent acid regeneration & wastewater treatment

● Acid mist scrubbers & zinc fume collectors

● Waste heat recovery & green energy management

2. Intelligent Manufacturing System

Real-time access for operators/managers to:

● Product quality analytics

● Energy consumption monitoring

● Live production output tracking

● Dynamic process visualization dashboards

With end-to-end automation, standardized operations and strict quality control, this line is a smart manufacturing benchmark in China, setting new standards for sustainable steel pipe corrosion protection.