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.
Wear Part Compatibility with Wheelabrator, Pangborn and Sintokogio Machines
The comparison that matters for a line already in service is not the purchase price. It is the wear bill. Blades, control cages, impellers and chamber liners are consumables, and over ten years their cost usually exceeds what you paid for the machine.
We manufacture compatible wear parts for Wheelabrator, Pangborn and Sintokogio machine series to the original dimensions, fitted by drawing or sample. The parts are cast in our own foundry, so the alloy grade, the liner thickness and the lead time are under our control rather than dependent on an outside supplier.
Wheelabrator, Pangborn and Sintokogio are trademarks of their respective owners. Compatibility references describe fit and function only, and do not imply any affiliation with or endorsement by those companies.
Sourcing Notes for International Buyers
When you request a shot blasting machine price from any manufacturer or supplier, compare more than the initial quotation: blast wheel quantity and power, abrasive recovery system, dust collector capacity and the cost of wear parts over the first years of operation. Jiangsu Dingtian Rust Removal and Coating Equipment Co., Ltd. is a China source factory
with shot blasting manufacturing experience since 1998, quoting factory-direct and supporting OEM / ODM customization of the H-beam steel structure shot blasting machine to your workpiece mix.
For an accurate quotation on the H-beam steel structure shot blasting machine, send your workpiece drawings or photos, the target cleanliness grade (for example Sa2.5 per ISO 8501-1) and your daily throughput; our engineers will recommend the model, blast wheel layout and environmental configuration, together with a wear-parts list. Contact us by email or WhatsApp for a tailored proposal.
A continuous machine in which long steel members such as 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.
Sa 2.5 near-white or Sa 3.0 white metal to ISO 8501-1, with a surface profile of Ra 12.5 to 50 micron, which is the range shop primer is specified to key into.
Typically four to twelve high-efficiency blast wheels, with positions arranged so the pattern covers the top flange, the bottom flange and both web faces. The count and layout are matched to the section range at the order stage.
Yes. The series is designed for long open-section members and runs automatically, with roller spacing adjustable across a wide section range.
Yes. We manufacture compatible wear parts for these machine series to the original dimensions, fitted by drawing or sample. The parts are cast in our own foundry, so the alloy grade and lead time are under our control. Wheelabrator, Pangborn and Sintokogio are trademarks of their respective owners; compatibility references do not imply any affiliation.
If you are at the quotation stage and want a checklist to compare suppliers
against, seven specification mistakes when specifying an H-beam blasting line
covers the parameters that are decided before the order and only show up in
year two: roller drive, wheel coverage, separator airflow, spare parts stock
and wear part grades.