Application of Shandong Kaitai Sandblasting Robots in Surface Cleaning Treatment of Rail Transit Vehicle Bodies

Rail transit equipment represents a core hallmark of a country's high-end manufacturing sector. The surface treatment quality of its key components such as car bodies, bogies and wheel sets directly determines the anti-corrosion service life, operational safety and appearance quality of vehicles. Traditional manual sandblasting is plagued by pain points including low efficiency, poor precision, severe dust pollution and high labor intensity, which can no longer meet the mass production and high-standard operation and maintenance requirements of high-speed trains and urban rail vehicles. Developed by Shandong Kaitai Blasting & Spraying Robot Co., Ltd. (Binzhou, Shandong), the eight-axis intelligent sandblasting robot stands out as critical equipment for the sandblasting process of high-speed train carriages thanks to its world-leading technical strength, and it profoundly empowers the intelligent manufacturing upgrading of the rail transit industry.

Application diagram of Kaitai B20 sandblasting robot for sandblasting and cleaning on vehicle bodies

Core Pain Points and Upgrade Demands of Rail Transit Surface Treatment

Rail transit equipment (high-speed trains, EMUs, subways, urban rail transit) features five major characteristics: large component sizes, complex structures, diverse materials (aluminum alloy/stainless steel/carbon steel), high precision requirements and strict environmental standards, bringing multiple challenges to the surface treatment process:

Difficult to guarantee consistent quality: The force, angle and distance of manual sandblasting are unstable, which easily leads to color difference, missing blasting and uneven roughness, and impairs the adhesion of subsequent coatings (rail transit requires a cleanliness grade of Sa2.5 and a roughness of 6-20μm).

Mismatch between efficiency and production capacity: Each high-speed train carbody (27m×3.2m×4.05m) only achieves a manual processing rate of 4 to 10 square meters per person per hour, failing to meet the takt time for rapid mass production.

Heavy safety and environmental protection pressures: Sandblasting dust endangers workers' health. Dust emissions from traditional open-air operations exceed standard limits, violating environmental regulations and occupational health requirements.

Difficulties in processing complex components: Bogies, wheel sets, carbody underframes and other parts feature numerous cavities and dense corners. Manual operation leaves massive blind spots, and incomplete cleaning may easily trigger hidden corrosion risks.

With the advancement of "Intelligent Manufacturing 2025" and accelerated localization and high-end upgrading of rail transit equipment, the industry is in urgent need of automated, intelligent and eco-friendly surface treatment solutions. Shandong Kaitai sandblasting robots have thus emerged to accurately address the industry's pain points.

Core Technical Advantages of Shandong Kaitai Blasting Robots (Adapted to Rail Transit Scenarios)

As a national-level single champion enterprise in the manufacturing industry and a leading high-end equipment manufacturer in Binzhou, Shandong, Shandong Kaitai has specialized in surface treatment for 26 years. Its independently developed fourth-generation intelligent sandblasting robot integrates core technologies such as eight-axis linkage control and flexible dynamic compensation, with key indicators reaching world-leading standards, and is fully adaptable to the harsh working conditions of rail transit.

8-axis hybrid linkage, blind-spot-free operation in an ultra-large workspace

Core Configuration: Self-developed 8-axis hybrid robot with an operating workspace of 100m in length × 35m in width × 7m in height. Its repetitive positioning accuracy reaches **±0.05mm**, far exceeding the industrial standard of ±0.1mm.

Scene Adaptability: Fully compatible with ultra-large complex components such as high-speed train car bodies and bogies. The nozzle distance, angle and speed are fully controllable throughout operation. Blind zones including corners and weld seams are 100% covered, completely eliminating the problem of missed spraying caused by manual work.

Technical Breakthroughs: Original flexible dynamic model and adaptive neural network control are adopted to counteract vibrations induced by sandblasting recoil in real time, cutting trajectory tracking error by 62% and enabling stable, jitter-free high-speed operation.

HMI Control and Programming Technology, Boosting Both Quality and Efficiency

Optimal Trajectory Planning: Equipped with an advanced gluing system and offline programming system, it generates the optimal cleaning trajectory, boosting cleaning efficiency by 35%. The cleaning duration for the leading vehicle and intermediate vehicles is 88 minutes, which meets the mass production cycle requirements.

Precisely Controllable Parameters: The sandblasting pressure (4-11 bar), abrasive particle size and spraying distance can be adjusted in real time to guarantee consistent surface roughness and cleanliness at Sa2.5–Sa3.0 levels.

Green intelligent integration for safety, environmental protection, cost reduction and efficiency improvement

Closed Dust Removal & Recovery: Equipped with an efficient dust removal system that meets environmental protection standards; the automatic recycling rate of abrasives reaches 95%, cutting consumable costs.

Man-Machine Separated Operation: Fully automated operation keeps workers away from hazards of dust and noise (≤85dB), eliminating occupational health risks; a single unit replaces 10 workers, reducing labor input by 21%.

Remote Operation & Maintenance Control: Integrated with an operation and maintenance platform, it supports fault early warning and data traceability, and seamlessly connects with the MES system to realize digital management of the entire production process.

High compatibility with domestic production, cost performance superior to imported equipment

Independent Control: The core control system, servo motors and robotic arms are all independently developed, breaking the technological monopoly held by foreign enterprises.

Customized Services: For various models of high-speed trains, urban rails and subways, we provide turnkey customized solutions integrating sandblasting robot equipment, sandblasting booths, dust removal systems and operation & maintenance services, which can adapt to workpieces of all sizes and various production capacity requirements.

Authoritative Certifications: Our technology has passed the appraisal of Shandong Machinery Industry Science and Technology Association and reached the world's advanced level. We hold more than 90 patents and have presided over or participated in the formulation of over 60 national and industrial standards.

Typical Application Scenarios and Cases in the Rail Transit Sector

Shandong Kaitai intelligent sandblasting robots have been widely applied in the manufacturing, operation and maintenance of core components such as high-speed EMUs, urban rail transit subways, railway locomotives, bogies and wheelsets. They serve leading manufacturers in industries including China's rail transit vehicle sector and have become core equipment for surface treatment in the rail transit field.

Sandblasting Treatment for High-Speed Train / EMU Car Bodies

Treatment Objects: Aluminum alloy / stainless steel car bodies (internal and external surfaces).

Process Requirements: Remove oxide scale, oil stains and old coatings; achieve surface roughness of 3.2–6.3μm and cleanliness grade Sa2.5 to guarantee adhesion of subsequent anti-corrosion coatings.

Application Effects: For car body processing, a single unit can treat 1 car body per day on average with a 40% higher efficiency; the treated surface features slight chromatic aberration and excellent uniformity, coating adhesion is improved by 25%, and the anti-corrosion service life of car bodies is extended to 15 years.

Surface Treatment for Urban Rail / Metro Vehicle Bodies and Components

Treatment Objects: Metro underframes, skirt panels and door frames; bogies, wheel set axles and buffer devices of urban rail vehicles.

Process Difficulties: Components feature compact structures and numerous cavities with diverse materials (carbon steel / aluminum alloy); sandblasting intensity must be precisely controlled to avoid substrate damage.

Application Effects: Adaptable to the urban rail production mode of small batches and multiple varieties; flexible workpiece switching without equipment shutdown; the cleaning pass rate reaches 99.8%, labor costs are reduced by 60%, and zero dust emission is realized.

3. Maintenance of Railway Locomotives and Key Components

Treatment Objects: Locomotive frames, rail fasteners, sleeper bolts, ventilation ducts, etc., for rust removal, old paint stripping and pre-welding surface preparation.

Scenario Advantages: Compatible with integrated mobile sandblasting rooms to flexibly fit maintenance sites; remote maintenance functions cut downtime and ensure normal operation of rail transit.

Core Customer Cases

Alstom: Barcelona, Spain; Collegno, Italy; Savigliano, Italy; Salzgitter, Germany;

Bombardier: Česká Lípa, Czech Republic; Crespin, France; Qingdao, China; the United Kingdom; Wrocław, Poland;

China Railway Signal & Communication Group (CRSC), Beijing;

CRRC: Qingdao, Nanjing, Guangdong, Chengdu;

Stadler Rail AG, Switzerland.

Future Outlook: Intelligent Sandblasting Robots Lead the New Trend of Rail Transit Surface Treatment

With the continuous development of rail transit equipment toward high speed, lightweight design, intelligence and eco-friendliness, the surface treatment process will be further upgraded in the directions of automation, digitalization and flexibility. Shandong Kaitai Shot Blasting Robot Co., Ltd.