Steel Pipe/Round Bar Roller Conveyor Shot Blasting Machine

Product Overview

The QZW series roller conveyor shot blasting machine is specifically designed for cleaning the outer walls of round and long workpieces such as steel pipes, solid bars, round steel, and threaded rebar, achieving integrated treatment of rust removal, oxide scale removal, and surface roughening. The workpiece is horizontally conveyed by a frequency-controlled rubber/steel roller conveyor, with inclined idlers driving the workpiece to rotate at a uniform speed. Multiple high-efficiency shot blasters propel shot at high speed from multiple angles, performing 360° all-around cleaning of the workpiece's outer wall. The equipment can be used independently or integrated into pipe rolling, hot-dip galvanizing, and anti-corrosion coating production lines to achieve continuous automated operation. It is widely used in industries such as oil and gas transmission steel pipes, water supply and drainage pipes, mechanically forged round steel, building rebar, pressure vessel round pipes, and wind power round shafts. After treatment, the surface cleanliness of the workpiece can reach Sa2.5 level (ISO 8501-1), and the roughness Rz 25–60 μm, effectively improving the adhesion of paint and galvanized layers.

Working Principle and Process Flow

Adjustable speed rubber/steel conveyor rollers smoothly feed pipes and round steel into the enclosed shot blasting chamber. Inclined idlers drive the workpiece to rotate at a uniform speed, while multiple high-efficiency shot blasters project shot at high speed from different directions, continuously impacting the outer wall of the workpiece to remove rust and oxide scale. The detached shot and rust residue fall to the bottom of the equipment and are collected by longitudinal and transverse screw conveyors to a bucket elevator, which then lifts them to an air separator. The separator uses gravity and air separation to separate intact steel shot, broken shot, and dust. Pure steel shot is stored in a storage hopper and quantitatively supplied to the shot blasters for reuse by a shot material controller. Dust generated during operation is centrally filtered by a matching pulse jet filter/bag filter, and the purified air is discharged in compliance with standards.

Process Flow: Feeding → Rotary Shot Blasting → Automatic Shot Material Recovery and Sorting → Dust Purification → Discharge

Core Configuration And Wear-Resistant Component Standards

The shot blasting machine adopts a high-efficiency direct-drive structure, with a direct-drive motor and no belt drive. The impeller is 100% dynamically balanced (dynamic balance grade G6.3) to ensure vibration ≤4.5 mm/s at high speeds. The blades, shot distribution wheel, directional sleeve, and guard plates are all made of high-chromium wear-resistant cast iron, with a chemical composition conforming to ASTM A532 standard, a hardness ≥58 HRC, and a standard blade life of 2500–3000 hours.

Shot blasting machine: High-efficiency direct-drive type, with different power configurations (11–30 kW) depending on pipe diameter and wall thickness. The arrangement angle is optimized through 3D simulation to ensure full coverage of the outer wall.

Conveying roller conveyor: Small-diameter pipes use variable frequency rubber roller conveyors (friction drive + rotation), while large-diameter pipes use steel roller conveyors (variable frequency motor drive), with stepless speed adjustment from 0.5–5 m/min.

Issuer roller brackets: Adjustable spacing and tilt angle to adapt to different pipe diameters, ensuring stable rotation of the workpiece without deviation.

Chamber liner: High-chromium cast iron/65Mn rolled liner, modular quick-connect design, thickness 10–20 mm, quick replacement.

Sealing system: Inlet and outlet labyrinth seals + multi-layer rubber curtains to prevent shot leakage while allowing smooth workpiece passage.

Shot material circulation system: Bottom spiral recovery + bucket elevator + air separation, separation efficiency ≥99%.

Dust removal system: Standard configuration includes a pulse jet filter cartridge dust collector (bag filter optional), dust emissions can be controlled to <5 ppm. mg/m³; Electrical system: PLC control (Siemens/Mitsubishi optional), touch screen operation, adjustable forward and reverse rotation of roller conveyor, supports automatic/manual mode, and optional remote monitoring module.

Installation and Maintenance

Installation Site Requirements:

QZW-04 model: Approximately 15 m × 4 m footprint (including loading, main unit, and unloading areas); factory height ≥ 6 m;
QZW-12 model: Approximately 22 m × 5 m footprint; factory height ≥ 7 m;
QZW-30 model: Approximately 35 m × 8 m footprint; factory height ≥ 9 m;

Required space for workpiece placement and turnover; recommended ≥ 3 m on each side;
Concrete foundation flatness ≤ 3 mm/m; roller conveyor foundation requires pre-embedded anchor bolts and tracks;
Power supply: 380V/3Ph/50Hz (or customized according to customer's power grid); Requires a total equipment power capacity + 20% margin.

Maintenance Points

Daily: Check the operating sound, vibration, and current of the shot blasting machine; check the smoothness of the roller conveyor operation; check the integrity of the inlet and outlet sealing curtains;

Weekly: Check the wear of vulnerable parts (blades, guard plates) and replenish lubricating grease; check the tension of the elevator belt/chain;

Every 3–6 months: Conduct a comprehensive inspection of the chamber guard plates and idler rollers for wear; check the position of the shot blasting machine's directional sleeve window; check the pressure difference of the dust collector filter cartridge/bag;

Blade Replacement Standard: Replace blades when wear exceeds 5 mm or cracks appear to ensure that the blasting speed does not decrease;

Global Service and Spare Parts Support

Jiuchang Machinery possesses independent import and export rights, offering various trade terms such as FOB/CIF/DDP, and supporting letters of credit, wire transfers, and milestone payments. Overseas installation services include a three-tiered model: remote technical supervision, on-site installation guidance, and turnkey projects. Global 24/7 response: over 80% of common faults can be resolved within 4 hours via remote diagnostics; local engineers arrive on-site within 48 hours. Commonly used spare parts from core market warehouses are delivered within 48 hours.

Applications

Scope Of Application

Suitable Workpieces: Seamless steel pipes, welded pipes, solid bars, hot-rolled round steel, threaded steel bars, forged round shafts, and other long and round metal components with diameters ranging from φ50 to 3000 mm.

Application Industries: Oil and gas pipeline manufacturing (pre-treatment of pipelines, casings, and conduits for corrosion protection) Municipal water supply and drainage steel pipe processing (rust removal before internal and external anti-corrosion coating) Mechanical forging processing (surface cleaning of round steel and bars) Pre-treatment of building steel bars (rust removal and roughening of threaded steel bars) Pressure vessels, wind power equipment, hot-dip galvanizing plants, etc.

Unsuitable Scenarios: Internal cavity cleaning (this equipment only treats the outer wall; internal cavities require a dedicated internal shot blasting machine or sandblasting equipment); Non-circular profiles (square tubes and H-beams require a QH series through-type shot blasting machine).