Core equipment for mining and mineral processing such as ball mills, rotary kilns, jaw crushers, cone crushers, ore conveyors, vertical mills and roller presses operate in open mines and mineral processing workshops for a long time under extreme working conditions including huge alternating impact loads, invasion of massive fine mineral dust, severe equipment vibration, erosion by rain and muddy water, drastic seasonal temperature fluctuation and uninterrupted 24-hour continuous grinding and crushing. Mining production lines demand strict continuity. Sudden bearing failure will directly lead to full-line shutdown, ore accumulation and process stagnation. The repair cycle is lengthy and causes massive economic losses. Ordinary cylindrical roller bearings cannot withstand the harsh mining environment, becoming a widespread pain point for mining enterprises. Continuous impact loads are generated during ore crushing and grinding. Ordinary bearing steel lacks sufficient toughness and tends to suffer raceway indentation, roller fragmentation and surface peeling under long-term cyclic stress, resulting in equipment vibration and unbalanced operation. A large amount of rock dust and mineral particles suspend in the air of mining areas. Simple seals cannot block fine mineral dust from penetrating into bearings. Dust mixes with grease to form abrasive paste and continuously wears raceways, leading to rapid expansion of bearing clearance. Rainwater and muddy water frequently invade open mining areas. Water vapor enters bearing cavities and triggers internal rust, aggravating abrasive wear. The temperature varies greatly between winter and summer. Conventional grease leaks easily at high temperature and solidifies at low temperature, resulting in sharp decline of lubrication performance. Maintenance space on equipment is narrow, and bearing disassembly and assembly are complicated. Frequent parts replacement disrupts mineral processing procedures and greatly increases spare parts procurement and labor maintenance costs.

Focusing on transmission supporting field for heavy mining industry, Japan NMT specially develops ultra-heavy-load impact-resistant high-dust wear-resistant long-life cylindrical roller bearings dedicated for mining machinery to solve industry pain points of ordinary mining bearings such as limited load capacity, poor impact resistance, easy mineral dust ingress, insufficient wear resistance and short service life in field conditions. Through five core upgrades including ultra-tough forged alloy steel matrix, multi-layer labyrinth dust-proof waterproof composite sealing, surface strengthening heat treatment for raceways, wide-temperature wear-resistant long-life lubrication and alternating impact load stress equalization optimization, it fully adapts to harsh working conditions of grinding, crushing and calcining equipment with heavy loads, heavy dust and strong vibration. It fundamentally solves problems including bearing impact damage, mineral dust abrasion, muddy water corrosion and premature failure, providing stable and reliable core transmission components for various mineral processing and clinker calcining production lines.

Core Product Advantages

1. Ultra-tough forged alloy steel matrix withstands continuous impact heavy loads: Adopting high-purity forged bearing alloy steel specially for mining heavy industry with multiple quenching & tempering and strengthening heat treatments, it greatly improves matrix toughness, compressive strength and fatigue resistance. It can withstand instantaneous impact and alternating loads generated by ore crushing and grinding for a long time, effectively restraining raceway plastic deformation, fatigue peeling and component cracking.

2. Multi-layer labyrinth composite sealing blocks ingress of mineral dust and muddy water: Equipped with exclusive multi-layer labyrinth and wear-resistant dust lip sealing system for mining conditions. It intercepts fine mineral powder, gravel dust, rainwater and muddy water layer by layer, prevents dust from mixing with grease to form abrasive medium and avoids grease emulsification by water absorption, significantly lowering risks of internal abrasive wear and corrosion.

3. Surface strengthening heat treatment for raceways improves wear durability: Surface strengthening treatment is applied on raceways and rolling elements to optimize metallographic structure, enhance surface hardness as well as pitting and spalling resistance. It slows precision attenuation under long-term mineral dust abrasion and continuous vibration and extends effective service life of bearings.

4. Wide-temperature wear-resistant long-life lubrication system adapts to seasonal temperature variation in mining areas: Custom lubrication formula optimized for open-air mining conditions features excellent hydrolysis resistance and anti-dust pollution performance. It hardly leaks at high temperature or hardens at low temperature, maintains continuous stable protective oil film all year round, reduces risks of overheating locking caused by dry friction and extends lubrication maintenance intervals.

5. Alternating impact load optimized structure evenly disperses vibration stress: Optimizing roller arrangement and internal clearance parameters to improve load distribution, relieve local stress concentration caused by continuous vibration during crushing and grinding, reduce precision loss from long-term cyclic operation and maintain stable equipment operation.

Application Scenarios

Horizontal ball mills, vertical mills, roller presses, rotary kilns, jaw crushers, cone crushers, ore belt conveyors, complete mineral processing equipment, various transmission support parts of sand and aggregate crushing production lines.

Precision Quality Assurance

NMT heavy-duty cylindrical roller bearings for mining machinery are manufactured strictly in accordance with Japanese heavy mining equipment manufacturing standards. Selected special bearing steel with high toughness, impact resistance, wear and corrosion resistance undergoes ultimate load durability test, mineral dust sealing durability test, muddy water spray corrosion test, high-low temperature cycle aging test and continuous impact fatigue test. The products feature high load limit, reliable sealing protection, outstanding wear and impact resistance and strong adaptability to field environments, fully adapting to all-weather continuous heavy-load working conditions with heavy dust and strong vibration in open mines and mineral processing workshops.

Product Range

Heavy-duty cylindrical roller bearings for ball mills, high-temperature wear-resistant bearings for rotary kilns, impact-resistant long-life bearings for crushers, high-precision support bearings for vertical mills and roller presses, dust-proof waterproof bearings for ore conveyors, customized non-standard ultra-heavy-load bearings for mining equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy mining, sand and aggregate processing and open-air working conditions with heavy dust and strong impact, specializing in performance optimization under scenarios of instantaneous impact load, mineral dust abrasion, field temperature change and continuous vibration. With Japanese forging and heat treatment technology, exclusive multi-layer dust-proof and waterproof sealing technology for mining working conditions and strict extreme working condition simulation testing system, it accurately solves industry problems of mining bearings such as impact fracture, abrasive wear caused by dust, muddy water corrosion and frequent maintenance replacement, supplying high-load, impact-resistant and ultra-long-life core transmission components for global metal mines, non-metallic mines, sand aggregate and cement clinker calcining industries.