Coal Mine Machinery

Hydraulic supports are the core supporting equipment of fully mechanized coal mining systems. Key load-bearing components including columns, hydraulic cylinders (outer cylinders, middle cylinders), piston rods and side jacks operate long-term under harsh underground conditions featuring high corrosion, severe abrasive wear and frequent impact loads. These parts are prone to rusting, scratching and material loss, which severely impairs the sealing performance and service life of hydraulic cylinders and poses potential safety hazards.

 Conventional processes such as electroplating and surfacing welding are being phased out by the market due to prominent drawbacks including severe environmental pollution, low bonding strength and easy coating spalling. With outstanding comprehensive advantages, laser cladding has become the dominant remanufacturing process for hydraulic supports:

 For outer surfaces of columns, piston rods, side jacks and other components, laser cladding of high-hardness stainless steel is widely adopted to replace traditional electroplating and surfacing welding, delivering drastically improved wear and corrosion resistance. For inner bores of outer cylinders, middle cylinders and similar parts, laser cladding of low-hardness stainless steel is being increasingly popularized as a substitute for copper electroplating and copper surfacing welding, which optimizes sealing fit and fatigue resistance.