Best Tunnel Shot Blasting Machine Factories & Suppliers

A tunnel shot blasting machine operates on a continuous pass-through architecture using motorized roller conveyors, overhead tracks, or mesh belts to convey parts through a stationary blast chamber lined with multi-angle blast wheels. This eliminates parts tumbling against one another—preventing edge damage, nicking, and surface deformation on precision workpieces. It delivers deterministic, continuous throughput for elongated, structural, or heavy components that cannot be processed in batch drums.

Intensity is regulated through closed-loop inverter motor control on the centrifugal blast turbines and precision electronic valves (such as Magnavalve systems) controlling abrasive flow rate (kg/min). By establishing saturation curves on standard Almen strips (Grade A, N, or C per SAE J442/J443), we lock the roller conveyor feed speed and turbine RPM. This guarantees repeatable coverage (from 100% to 200%) and intensity parameters verified per AMS 2430 and AMS 2432 standards.

Our tunnel machines are engineered to handle a broad range of abrasives, including high-carbon cast steel shot (S70 to S780), steel grit (G14 to G80), stainless steel cut wire, ceramic beads, and glass microspheres. Internal recovery components—including screw conveyors, elevator belts, and dual air-wash separators—are customized to media hardness and mass to ensure efficient classification without media damage.

KOSHIN blast chambers utilize a dual-barrier protective philosophy. The direct impact blast envelope is fabricated from high-grade rolled manganese steel (Mn13) supplemented by interlocking, bolt-on cast alloy wear plates (such as 20% Cr high-chromium alloy). The labyrinth entrance and exit vestibules feature multi-layer rubber and polyurethane curtains that prevent abrasive leakage while preserving internal atmospheric negative pressure.

Yes. KOSHIN maintains comprehensive in-house testing facilities equipped with robotic shot peening, roller tunnel blast cells, and precision laboratory metrology. We execute pre-production trials on client-supplied samples, analyzing residual stress profiles via X-ray diffraction (XRD), surface profile roughness (Ra/Rz), and micro-hardness, generating a turnkey FAT qualification report prior to capital commitment.

To accurately configure the tunnel size, turbine count, and filtration capacity, please provide: maximum and minimum workpiece dimensions (L x W x H), component weight, base material specifications, initial surface condition (mill scale, rust grade, heat treat scale), target final surface standard (e.g., Sa 2.5 or Sa 3.0), target line speed (meters per minute), and factory power supply/footprint constraints.

Our tunnel systems incorporate down-draft pulse-jet cartridge dust collectors with PTFE-membrane flame-retardant filters. The design maintains clean-air exhaust emissions well below 2.0 mg/Nm³, fully satisfying OSHA, EPA, and European CE/ATEX directives. Differential pressure transmitters continuously monitor filter restriction, initiating automated reverse air-pulse cleaning cycles without interrupting blast operations.

Headquartered in Singapore with an integrated global production base, KOSHIN deploys factory-certified commissioning engineers across North America, Europe, Asia, and the Middle East. We provide turnkey on-site assembly, electrical SAT verification, operator PLC training, and rapid spare-part replenishment (turbine blades, control cages, liners, seals) to assure 98%+ operational availability across the machine lifespan.