tunnel shot blasting machine

Tunnel Shot Blasting Machine – Continuous Conveying System for High‑Volume Steel Surface Treatment

Botou Junda Machinery Equipment Co., Ltd., drawing on more than 20 years of expertise in foundry equipment, delivers enterprise‑grade tunnel shot blasting machine solutions. Our continuous‑feed systems process 1‑15 tons per hour, adopting a monorail through‑type tunnel structure and multi‑angle blast‑wheel configuration. Installed power ranges from 37 kW to 160 kW, supporting batch loads from 500 kg to 10,000 kg. Customisable roller or overhead‑monorail designs are available with conveying speed of 2‑4 r/min. Every machine achieves consistent Sa2.5 surface‑cleanliness grades on H‑beams, steel plates, pipes and welded frames, backed by ISO9001, ISO14001 and ISO45001 certifications from our 3,000 m² production facility.

What Makes Our tunnel shot blasting machine Different

Conventional batch‑type cleaning systems interrupt production workflows and create bottlenecks in high‑volume operations. Our tunnel shot blasting machine eliminates these inefficiencies via a continuous‑feed architecture.

Workpieces automatically enter the blasting tunnel, pass through multi‑directional abrasive streams, and exit without manual handling. Roller conveyors maintain adjustable speeds synchronised with downstream painting or coating lines, boosting overall throughput by up to 40 %.

This seamless integration transforms separate cleaning operations into one unified production chain. You gain predictable cycle times, reduced labour costs and consistent surface quality across every batch.

Technical Specifications

Core Performance Features

Continuous Non‑Stop Production Architecture

The tunnel design receives workpieces at one end and discharges cleaned parts at the other without stopping the conveyor. Variable‑speed control lets you match processing rates to upstream welding or downstream coating operations.

This configuration removes batch‑related delays common in rotary‑hook or tumble‑blast systems. Your production line maintains constant material flow, cuts idle time and maximises equipment utilisation.

Multi‑Angle Blast‑Wheel Configuration

Dynamic simulation determines optimal blast‑wheel placement prior to manufacturing. Turbines positioned at top, side and bottom angles deliver overlapping abrasive coverage.

This layout minimises shadow areas on complex geometries such as welded frames or ribbed structures. Every surface receives uniform impact energy to deliver stable Sa2.0‑Sa2.5 cleanliness grades with controlled anchor profiles of 40‑120 μm.

Versatile Workpiece Handling

Tunnel length and inlet dimensions are customised to your specific materials. Roller conveyors suit straight profiles including steel plates, I‑beams and pipes up to 12 metres long.

Overhead‑monorail versions accommodate irregular welded structures and heavy castings. Load capacities range from 500 kg for automotive parts up to 10,000 kg for mining‑equipment frames to satisfy diverse industrial demands.

Closed‑Loop Abrasive Management

Spent abrasives fall through the grated tunnel floor into collection hoppers. Bucket elevators transport media to air classifiers, separating reusable shot from dust and debris.

Recovered abrasives feed directly back into blast‑wheel hoppers to sustain steady flow without manual refilling. Compared with open blasting methods, this closed‑loop system reduces media consumption by up to 60 % and lowers long‑term operating costs.

Industrial Applications

Steel‑structure fabrication plants deploy our systems to remove mill scale from H‑beams and channel steel before welding. Continuous feeding processes variable section lengths without production shutdowns.

Automotive manufacturers process truck chassis and agricultural‑equipment frames, where the tunnel configuration delivers uniform cleaning for complex weldments. Pipe anti‑corrosion facilities integrate the machines into automated coating lines for seamless pre‑treatment.

Foundries use the equipment for deburring engine blocks and industrial castings. The sealed tunnel operates reliably in dusty, high‑temperature environments while protecting operators from abrasive exposure.

System Components & Integration

A complete installation comprises roller or chain conveyors, sealed blasting‑tunnel chambers, and strategically positioned centrifugal blast wheels running at 2200‑3000 RPM. Bucket elevators and screw conveyors recover spent media.

Air‑wash separators maintain 99 % abrasive purity by removing broken shot and contaminants. Pulse‑jet cartridge dust collectors with integrated spark arrestors capture airborne particulates, keeping workplace air quality below 30 mg/m³.

A PLC control system manages conveyor speed, blast‑wheel intensity and abrasive flow via touch‑screen interfaces. Programmable recipes store settings for different workpiece types to enable fast change‑overs.

Quality Assurance & Customisation

Dynamic balancing of blast wheels keeps vibration below 2.5 mm/s to prevent premature bearing wear. Abrasive‑flow calibration verifies optimal current draw for maximum impact energy.

Liners adopt high‑manganese ZGMn13 cast plates tested to Rockwell‑hardness standards, guaranteeing service life exceeding 2000 hours. Equipment configurations adapt to local voltage standards, environmental regulations and facility layouts.

We supply technical drawings, English‑language operation manuals, remote installation guidance and operator training. Custom options include intelligent monitoring software, private‑labelling and integration with existing production‑control systems.

Frequently Asked Questions

Q: What workpieces are suitable for this equipment?

A: It is mainly used for continuous pre‑treatment of steel plates, section steel, steel pipes and steel structural parts. Widely adopted for high‑volume inline blasting operations in steel‑structure workshops, pipe anti‑corrosion projects and shipbuilding.

Q: What conveying method does this equipment adopt?

A: It is equipped with a roller‑conveyor system. Workpieces pass through the blasting tunnel at constant speed. Conveying speed can be adjusted according to workpiece specifications, supporting automatic continuous feeding and discharging without frequent manual handling.

Q: What advantages does this equipment have compared with hook‑type models?

A: It enables non‑stop continuous production with higher output. Long profiles can pass through without length restrictions. Fully‑automatic operation saves labour, making it ideal for high‑volume standardised steel‑structure pre‑treatment lines.

Q: What components make up a complete system?

A: Roller conveyor, sealed blasting tunnel, multiple blast wheels, bucket elevator, shot separation‑cleaning unit, pulse dust collector and PLC intelligent‑control system, forming a closed abrasive circulation system.

Contact Us For Your Solution

Our technical team replies within 6‑8 hours to discuss your specific requirements. Please reach us via junda001@jundablast.com for custom‑configured tunnel shot blasting machine proposals and delivery timelines.