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Plate & Profile Shot Blasting Machine
Product Description:
A plate and profile shot blasting machine cleans flat plate and long sections — H-beams, I-sections, channel and angle steel — continuously on a powered roller conveyor, before coating. Workpieces pass through a sealed blast chamber while cantilever-mounted blast wheels throw steel shot at the surface, stripping mill scale, rust and weld spatter in a single pass. Eight Q69 models cover 800 mm to 4,000 mm working width, 3 mm to 110 mm plate thickness and profile sections up to 300 mm. It is built for workpieces that sit stably on a roller bed: it does not shot peen, it does not clean stainless or aluminium with steel shot, and it cleans one face per pass.
How a Plate & Profile Shot Blasting Machine Works
Conveying sets the cycle. A powered roller conveyor carries the workpiece through the chamber at a stepless 0.5–4 m/min on six of the eight models, 0.5–4.5 m/min on the Q6930 and 2–8 m/min on the Q6940. Conveyor speed is the lever that trades throughput for blast exposure: a plate run at 1 m/min receives four times the shot of the same plate at 4 m/min, which is why heavy mill scale and a light descale are run at different speeds on the same machine rather than on two machines.
Abrasive is recovered, not consumed. Spent shot falls to a screw conveyor, is lifted by a bucket elevator, cleaned in an abrasive separator that takes out broken shot and dust, and returned to the wheels. A height-adjustable roll brush (200–900 mm) strips residual shot from the top face at the chamber exit so it does not travel down the outlet conveyor.
Dust is captured at the chamber. The chamber runs under negative pressure and is exhausted at 12,000–38,000 m³/h to a cartridge dust collector sized together with the machine, not added afterwards.
What It Takes and What It Does Not
This is the section that decides whether your workpiece belongs on this machine.
Plate from 3 mm to 110 mm. The 110 mm ceiling belongs to the Q6930 alone; the Q6940 stops at 100 mm. Below 3 mm the plate deflects under shot impact and the blast pattern stops being even — thin sheet needs support rolls or a different machine type.
Plate width to 4,000 mm. The Q6940 sets the ceiling. Wider plate is engineered to order: no catalogue model, no published parameters, no fixed lead time.
Profile section up to 300 mm. Under 20 × 160 mm on the Q6912 to Q6925, under 30 × 300 mm on the Q6930 and Q6940.
Workpiece length 1,200 mm to 18,000 mm. A piece shorter than the roller pitch does not track — it slips or turns in the chamber. The practical route is to blast full lengths and cut afterwards.
One face per pass. The roll brush clears the top face. Whether the wheel layout also cleans the underside is fixed when the arrangement drawing is issued, so raise it before the order if single-pass two-face cleaning is a requirement.
Steel, not stainless or aluminium. Steel shot transfers iron to stainless, which shows as rust bloom after the part sees moisture, and it embeds in aluminium. Neither is a steel-shot job on this machine.
If a workpiece falls outside all six, it is not a matter of "customisation" — it is a different machine type, and we will say so.
Q69 Series: Eight Widths, Two Thickness Classes
Model | Working width | Feeding inlet (W × H) | Plate thickness | Profile size | Abrasive flow rate | Total power |
Q698 | 800 mm | 800 × 1,600 mm | 3–60 mm | — | 8 × 180 kg/min | 78.3 kW |
Q6910 | 1,000 mm | 1,000 × 260 mm \* | 4–60 mm | — | 8 × 200 kg/min | 78 kW |
Q6912 | 1,200 mm | 1,200 × 400 mm | 3–60 mm | < 20 × < 160 mm | 4 × 250 kg/min | 78.3 kW |
Q6915 | 1,500 mm | 1,500 × 400 mm | 3–60 mm | < 20 × < 160 mm | 6 × 250 kg/min | 130 kW |
Q6920 | 2,000 mm | 2,000 × 400 mm | 4–60 mm | < 20 × < 160 mm | 6 × 250 kg/min | 156.6 kW |
Q6925 | 2,500 mm | 2,500 × 800 mm | 4–60 mm | < 20 × < 160 mm | 6 × 250 kg/min | 224.55 kW |
Q6930 | 3,000 mm | 3,000 × 800 mm | 4–110 mm | < 30 × < 300 mm | 6 × 360 kg/min | 204.8 kW |
Q6940 | 4,000 mm | 4,000 × 400 mm | 3–100 mm | < 30 × < 300 mm | 8 × 360 kg/min | 293.6 kW |
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Product Description
Where Plate and Profile Blasting Pays Back
Steel structures — box girders, columns, roof trusses and workshop frames, cleaned before priming so the coating bonds to a profile rather than to scale.
Plate processing — hot-rolled and cold-rolled plate, descaled at the head of a cutting or profiling line.
Shipbuilding — deck plate, hull plate and block assembly plate, to the surface standard a marine coating system demands.
Wind towers and bridges — thick plate for tower sections and bridge box girders, where the coating system is specified for 25 years and the substrate has to be right first.
Engineering machinery — frames, booms and chassis plate for excavators, loaders and cranes, plus automotive chassis and frame plate from 4 mm up.
The common thread is downstream cost. Blasting is cheap against a coating failure on a bridge or a tower section, and it is the only one of the three preparation routes — pickling, manual blasting, machine blasting — that produces the same surface at the first piece and the ten-thousandth.
Surface Quality and Acceptance: Sa 2½ (ISO 8501-1)
Sa 2½ to ISO 8501-1 is the grade written into the technical agreement. What a given plate reaches depends on three things: incoming condition, abrasive specification and conveyor speed — which is why the grade is agreed per project rather than printed as a machine rating.
Surface roughness is set against the coating system, not fixed by the model. A zinc-rich primer and a thick-film epoxy want different anchor profiles, and the machine can be run to either by changing abrasive size and conveyor speed. If the coating specification states a roughness band, quote it in the enquiry and it becomes part of the acceptance criteria.
Sa 3 is occasionally asked for. It is achievable on clean, uniform plate under controlled conditions, but it is not a rating we publish for the series, and a job that specifies it should be reviewed with our engineering team before the quotation goes out.
Pit Depth, Foundation and Site Services
The machine sits over a pit on most models. Pit depth below floor level runs from 1,616 mm (Q6912) to 2,257 mm (Q6915), 2,535 mm (Q6925), 2,800 mm (Q6920) and 4,370 mm (Q6930 and Q6940). The Q698 and Q6910 are not listed in the parameter table and are confirmed from the general arrangement drawing.
Pit, drainage and maintenance access have to be designed together, and the pit is on the critical path of the building works — it is worth fixing the model before the foundation drawing is issued. Total power runs from 78 kW to 293.6 kW excluding the dust collector, and dust extraction air volume from 12,000 m³/h to 38,000 m³/h, both of which the customer's electrical and ducting design needs early.
Delivery, Installation and Service
Lead time: 35–60 days after receipt of order for standard configurations
Above 3,000 mm working width, lead time is confirmed separately against chamber dimensions and vessel booking
Scope of supply: blast system, dust collection system, model-specific wear parts — freight, insurance, duty and third-party inspection excluded
Installation: not included in the equipment price; USD 135 per man-day, overseas travel by the buyer, remote guidance for self-installation
Warranty: 12 months from the final acceptance certificate, normal wear parts excluded
Quality issues: written response within 24 hours
Voltage: built to the destination standard, motor selection confirmed in writing at the order
KingWo has built blast equipment since 2019 at a 4,800 m² plant with 50+ staff and an annual capacity of 200 sets, and has delivered over 1,500 sets. Management is certified to ISO 9001, ISO 14001 and ISO 45001, and the machines carry CE marking.
Technical Specifications
Q: Can one machine clean both plate and H-beams?
A: Yes, on the same roller bed without a tooling change. Plate and sections both convey through the chamber; what differs is whether the roller pitch and the wheel layout cover a section's flange and web. Six of the eight models carry a profile size rating; the Q698 and Q6910 have none in the parameter table and need separate confirmation for sections.
Q: Can it clean stainless steel or aluminium plate?
A: Not on this series. Steel shot transfers iron to stainless, which reappears as rust bloom once the part sees moisture, and it embeds in aluminium so the surface fails coating inspection. Stainless needs stainless shot or glass bead, and aluminium needs dedicated equipment — a different product line.
Q: What is the thinnest plate it will take?
A: 3 mm on the models rated for it — the Q698, Q6912, Q6915 and Q6940. Below that, the plate deflects elastically under shot impact, the blast pattern becomes uneven across the width and the plate distorts. Thin sheet needs support rolls or a different machine; turning the abrasive flow down does not solve it.
Q: What surface grade and roughness can it reach?
A: Sa 2½ to ISO 8501-1 is the grade written into the technical agreement; what a given plate reaches depends on incoming condition, abrasive specification and conveyor speed. Roughness is agreed against the coating system rather than fixed by the model. Sa 3 is not published as a series rating and is reviewed per workpiece.
Q: How deep a pit do we need?
A: Pit depth is 1,616 mm on the Q6912, 2,257 mm on the Q6915, 2,535 mm on the Q6925, 2,800 mm on the Q6920 and 4,370 mm on the Q6930 and Q6940. The pit sits on the critical path of the building works, so fix the model before the foundation drawing is issued.
Q: What is the lead time?
A: 35–60 days after receipt of order for standard configurations. Above 3,000 mm working width, lead time is confirmed separately against chamber dimensions and vessel booking. Non-standard dimensions, export crating, peak-season capacity and third-party inspection all extend it.
Q: What does the price include, and is installation included?
A: The complete-set price covers the blast system (machine, blast wheels, bucket elevator, abrasive separator, conveying), the dust collection system (collector and ducting) and the model-specific wear parts. Freight, insurance, destination duty and clearance, and third-party inspection are excluded. Installation and commissioning are not in the equipment price: USD 135 per man-day, overseas travel by the buyer.
Q: What warranty and after-sales response do you offer?
A: 12 months from the date the final acceptance certificate is signed, excluding normal wear parts; we recommend stocking two years of wear parts. Any quality issue reported by the buyer gets a written response within 24 hours. The warranty is void where damage results from non-original wear parts or unauthorised modification. Motors are selected to the destination voltage standard and confirmed in writing at the order.
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