For steel structure fabricators, removing rust, mill scale, and welding slag from large H-beams, I-beams, and steel girders is essential before painting. Manual grinding is slow and inconsistent; chemical pickling raises environmental concerns. A H-beam steel structure shot blasting machine is the efficient, automated, and eco-friendly answer for high-volume descaling.
Core Equipment: Roller Conveyor Through-Type Shot Blasting Machine (QH69 Series)
A roller conveyor through-type shot blasting machine is purpose-built for long, open-section members such as H-beams, I-beams, and steel girders. The QH69 series enables fully automatic, continuous operation — the standard pretreatment line in steel structure plants.
How the Shot Blasting Process Works
- Loading & Feeding: Workers place H-beams or girders on the infeed roller conveyor; the variable-speed, electrically controlled rollers feed them into the enclosed blasting chamber at a steady speed.
- All-Around Blasting: Strong abrasive streams strike every surface from different angles (top, bottom, left, right). Depending on section size, 4–12 high-efficiency blast wheels accelerate steel shot to over 80 m/s by centrifugal force.
- Cleaning & Strengthening: Mill scale, rust, welding slag, and dirt fall off rapidly. This also relieves welding residual stress and strengthens the surface, improving fatigue strength.
- Separation & Recovery: The dust and shot mixture falls to the floor, is collected by screw conveyors, and lifted by a bucket elevator to a separator. Clean shot is recycled; dust goes to the dust collection system.
- Cleaning & Discharge: The cleaned workpiece passes high-pressure air blowing or roller brushes to remove residual shot and dust, then leaves via the discharge conveyor, ready for painting.
Key Parameters & Quality Standards
- Descaling grade: Sa2.5 (near-white) or even Sa3 (white metal) — oil, grease, dirt, mill scale, and rust fully removed.
- Surface roughness: Uniform profile with Ra typically 40–75 µm, creating ideal mechanical anchoring for anticorrosion paint.
- Conveying speed: Variable-frequency drive, 0.5–1.5 m/min depending on the required grade (slower for heavy rust or Sa3).
- Environmental performance: Two-stage dust collection (settling chamber + cartridge filter) keeps emissions very low (indoor ≤15 mg/m³, outdoor ≤65 mg/m³).
Selection & Customization for Different Steel Structures (OEM/ODM)
- Standard H-beams/I-beams: Use a standard roller conveyor through-type machine. The blast wheel layout is verified by computer 3D dynamic simulation, ensuring even coverage of flange top/bottom and both web sides with minimal dead zones.
- Custom needs: As an OEM/ODM manufacturer, we tailor machines to your workshop layout, maximum workpiece weight and section size, flexibly customizing roller spacing, blast wheel quantity (6–12), and dust collection airflow.
H-Beam Shot Blasting Machine vs. Wheelabrator, Pangborn & Sintokogio
Compared with Germany’s Wheelabrator, the US’s Pangborn, and Japan’s Sintokogio, our H-beam steel structure shot blasting machine delivers comparable quality at one-fifth the price. Wear and consumable parts cost just one-tenth of these three brands, lowering long-term operating costs. We also offer custom manufacturing of wear parts for Wheelabrator, Pangborn, and Sintokogio machines at one-tenth of original-equipment prices — cutting maintenance budgets.
FAQ: H-Beam Steel Structure Shot Blasting Machine
What is a roller conveyor through-type shot blasting machine?
A continuous machine in which long steel members like H-beams, I-beams, and girders are fed on powered rollers through a sealed blasting chamber, where blast wheels clean them with high-speed steel shot.
What descaling grade can it achieve?
Sa2.5 (near-white) or even Sa3 (white metal), with uniform roughness of Ra 40–75 µm — ideal for painting and long-lasting adhesion.
How many blast wheels does the QH69 series use?
Typically 4–12 high-efficiency blast wheels, arranged by computer 3D simulation for even coverage; the quantity can be customized (6–12) to your workpieces.
Is it suitable for large H-beams and steel girders?
Yes. The QH69 series is designed for long, open-section members, runs fully automatically, and handles various section sizes with adjustable roller spacing.
How does it compare with Wheelabrator, Pangborn, and Sintokogio?
Comparable quality at one-fifth the price; wear and consumable parts cost one-tenth, and we custom-manufacture wear parts for these brands at one-tenth of OEM prices.
Looking for a reliable shot blasting machine for your H-beam or steel structure line? Contact us for a tailored solution.