Trolley-Type Shot Blasting Machine

Product Overview

Trolley-type shot blasting machine (Q76 series) is a special equipment designed for surface cleaning of ultra-large and ultra-heavy castings, forgings, and welded structural parts. The workpiece is placed on the trolley, which enters the closed shot blasting cleaning room through the track. Multiple shot blasters project projectiles at high speed from different angles to conduct all-round impact cleaning on all surfaces of the workpiece. The trolley can rotate to ensure that the workpiece is covered without any blind spots. The equipment has two forms: single cart and double cart. The double cart type can realize parallel operations of loading, unloading and cleaning, shortening auxiliary time. After treatment, the surface cleanliness of the workpiece can reach Sa2.5 level (ISO 8501-1), and the roughness Rz 25–60 μm (depending on the abrasive type and process parameters).

Working Principle and Process Flow

Workpieces are loaded onto trolleys, which travel along tracks into the cleaning chamber. After the chamber door closes, the trolley rotates (adjustable from 0.3 to 3 rpm), and multiple shot blasters launch high-speed shot from the perimeter and top at a 3D simulation angle. The shot is collected via a bottom scraper recovery system, a screw conveyor, and a bucket elevator into an air separator, where it is separated and recycled. Dust and broken shot are filtered by a dust removal system before being discharged in compliance with standards. A dual-trolley configuration allows entry and exit from two workstations; while one trolley is cleaning, the other is loading and unloading outdoors, alternating in a cycle.

Process Flow: Loading onto trolley → Trolley enters chamber → Shot blasting → Trolley exits chamber → Shot blowing → Unloading

Core Configuration And Wear-Resistant Parts Standards

The shot blasting unit is the core component of the equipment. It employs a high-efficiency direct-drive shot blasting system, with an impeller that undergoes 100% dynamic balancing (dynamic balance grade G6.3) to ensure vibration levels ≤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 standards, a hardness ≥58 HRC, and a standard blade life of 2500–3000 hours.

Shot blasting machine: High-efficiency direct-drive type, direct motor connection, no belt drive, reducing maintenance points;

Chamber lining: High-chromium cast iron/65Mn rolled lining, 10–20 mm thick, quick-replaceable;

Trolley: Welded steel structure, surface covered with high-chromium wear-resistant lining, heat-treated bearing wheels, heavy-duty bearings;

Sealing system: Multi-layer rubber/spring steel plate sealing curtain + labyrinth seal to prevent shot escape;

Dust removal system: Standard configuration includes pulse jet cartridge dust collector or pulse jet bag dust collector (optional), dust emissions can be controlled to <5 mg/m³;

Electrical system: PLC control, touch screen operation, supports automatic/manual modes, remote monitoring module optional.

Installation And Maintenance

Installation Site Requirements:

Q7630 model: Approximately 18 m × 12 m footprint (including tracks, workpiece placement area, and maintenance access); factory height ≥ 10 m;
Q7650 model: Approximately 22 m × 15 m footprint; factory height ≥ 12 m;
Concrete foundation flatness ≤ 3 mm/m; embedded parts must be pre-installed in the track foundation;
Power supply: 380V/3Ph/50Hz (or customized according to customer's power grid); a 20% margin in total equipment power is required.

Maintenance Points

Daily: Check the operating sound, vibration, and current of the shot blaster; check the integrity of the trolley track and sealing curtain; check the dust collector pressure differential;

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 the thickness of the trolley wear-resistant plates; check the position of the shot blaster directional sleeve window; check the pressure differential 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 for surface cleaning and strengthening of ultra-large cast steel parts, cast iron parts, forgings, welded structural parts, and steel structural parts. Widely used in heavy machinery, wind power equipment, automobile manufacturing, steel metallurgy, aerospace, rail transportation, petroleum machinery, and other industries. Particularly suitable for ultra-large workpieces that are large in size, heavy in weight, and unsuitable for lifting or suspension, such as wind turbine tower bases, turbine runner chambers, large gearboxes, axles, bogies, and large steel components.