La maquinaria minera del carbón opera en entornos extremadamente hostiles y exigentes, con ciclos de trabajo continuos prolongados y cargas pesadas. Componentes críticos como picos de corte, cintas transportadoras, engranajes y ejes son altamente propensos al desgaste y a fallas, mientras que los cilindros de soporte hidráulico y los vástagos de los pistones suelen sufrir daños por corrosión. Estos problemas reducen significativamente la vida útil del equipo y provocan costosos tiempos de inactividad. Dado que la maquinaria minera del carbón suele ser grande, costosa y difícil de desmontar, las tareas de mantenimiento son considerables, y cualquier falla de una pieza causada por desgaste o corrosión puede ocasionar importantes pérdidas económicas.

Método de reparación tradicional: galvanoplastia

• Baja fuerza de adhesión; los recubrimientos se desprenden fácilmente y tienen una vida útil corta.

• Grave contaminación ambiental y riesgos para la seguridad.

• Se han ido eliminando gradualmente en las aplicaciones industriales modernas.

Revestimiento láser: remanufactura de superficies de bajo costo y alta eficiencia.

El revestimiento láser permite el refuerzo superficial y la remanufactura de componentes, tanto nuevos como desgastados. La aplicación de este revestimiento a cilindros hidráulicos, columnas de soporte y otras piezas clave mejora significativamente la resistencia al desgaste y la corrosión, prolongando así la vida útil de los componentes.

La tecnología de revestimiento láser de alta velocidad de Chengdu Greenstone-Tech ofrece velocidades de procesamiento más rápidas y superficies de recubrimiento más lisas y uniformes en comparación con el revestimiento láser convencional. La mayoría de los componentes solo requieren un acabado ligero antes de volver a estar en servicio, lo que reduce el tiempo y el costo de mecanizado. El revestimiento láser de alta velocidad se ha convertido en una tecnología líder en la remanufactura de superficies láser para aplicaciones en equipos de minería de carbón.

Scene 1: Laser Cladding for Hydraulic Support Cylinder Inner Walls

The inner cylinder walls of hydraulic support columns in coal mining operations are prone to corrosion and pitting due to substandard emulsions or prolonged exposure after being lifted from the mine. The commonly used repair method is arc copper cladding, which provides thick, corrosion-resistant coatings but involves high heat input and elevated costs.

Inner-wall laser cladding offers an effective alternative and expansion to traditional arc copper deposition, especially for small-diameter components. Laser cladding allows precise selection and adjustment of alloy powders according to service conditions, enabling rapid fabrication of high-performance corrosion-resistant coatings.

Greenstone’s internal laser cladding heads feature high integration, excellent stability, mature process control, and strong adaptability. The resulting inner-wall cladding surface is smooth, uniform, and defect-free, significantly reducing subsequent machining requirements while minimizing thermal deformation of the component. This ensures long-term durability and enhanced performance for hydraulic support cylinders operating in harsh underground mining environments.

Scene 2: Laser Cladding for Hydraulic Support Columns

Hydraulic support columns are critical components in coal mining equipment and operate for long periods in acidic and alkaline corrosive environments. Their surfaces are continuously subjected to corrosion, wear, and impact loads. Traditional remanufacturing techniques, primarily electroplating, provide short service life, limited repair cycles, and cause environmental pollution.

Laser cladding offers a superior alternative, with strong metallurgical bonding between the coating and substrate and a dense microstructure. Extensive industrial applications show that laser-cladded support columns deliver significantly improved performance and durability compared with electroplated columns. Using a high-energy laser beam as the heat source, laser cladding melts wear-resistant and anti-corrosion alloy powders together with the substrate surface, forming a robust protective layer that dramatically extends the service life of hydraulic supports.

Compared with electroplating, laser cladding provides exceptional technical advantages, supports green and sustainable manufacturing, and delivers substantial economic and operational benefits for coal mining enterprises.

Scene 3: Laser Cladding for Cutting Picks

Cutting picks are critical components in coal mining and tunneling machines, responsible for coal breaking and fragmentation. Their performance directly affects machine productivity, power consumption, operational stability, and the service life of associated components. During operation, cutting picks are subjected to high cyclic compressive stress, shear stress, and impact loads. Typical failure modes include tip detachment, chipping, wear of the pick tip and body, and, under severe conditions, body fracture. Therefore, efficient repair and reinforcement of worn picks is a key concern for equipment manufacturers and mining operators.

Applying tecnología de revestimiento láser to cutting pick refurbishment and remanufacturing significantly increases surface hardness and wear resistance, extending service life and reducing replacement frequency. Greenstone has successfully implemented high-performance laser cladding on cutting picks. A single cladding layer typically reaches 1–3 mm thickness con hardness up to HRC 65, free of cracks and porosity defects. The resulting wear-resistant coating dramatically reduces wear and breakage, lowers pick consumption, and minimizes spark generation during cutting, improving safety and boosting equipment availability and mining machine uptime.

Ventajas clave

• Substantially enhanced wear resistance for cutting picks and pick holders, longer service life, reduced operating costs

• Dense, uniform cladding microstructure with controlled thickness and coverage; minimal micro-defects

• Strong metallurgical bonding with controlled dilution rate for superior durability

• Rapid cooling rate, minimal heat-affected zone, and extremely low thermal deformation

This advanced laser cladding solution provides a robust and sustainable method to upgrade cutting tools for modern coal mining operations.

Scene 4: Laser Cladding for Gears and Shaft Components

Coal mining machinery operates under heavy loads, high rotational speeds, and prolonged high-temperature conditions. As a result, gears, shafts, and other transmission components are highly susceptible to wear, corrosion, and fatigue-related failures. When these critical parts fail, whether through factory repair or complete replacement, mining operations incur substantial downtime and economic losses.

Laser cladding provides an efficient and cost-effective solution for restoring and strengthening worn gears and shafts. By selecting specialized alloy powders based on material composition, hardness, and performance requirements, laser cladding restores original dimensions and mechanical properties while significantly enhancing wear and corrosion resistance. This technology not only extends component service life but also delivers strong economic benefits by reducing replacement frequency, maintenance time, and overall operating costs in coal mining applications.