Cement rotary kilns, vertical raw mills, cement roller presses and ball mills are core equipment of new dry-process cement production lines. Support positions of supporting rollers, grinding rollers and squeezing rollers operate under harsh working conditions: ultra-large continuous combined loads, high-temperature radiation from kiln shells, floating large amounts of high-hardness raw meal and clinker dust, periodic impact generated by material extrusion and uninterrupted all-weather calcination and grinding. Cement production lines require extremely high continuity. Rotary kilns are large continuous thermal equipment. Restarting and heating after shutdown takes a long time, and clinker inside the kiln cools and agglomerates easily, resulting in raw material waste, disrupted production rhythm and huge economic losses. Ordinary tapered roller bearings cannot adapt to harsh high-temperature and dust-filled environments in cement plants, becoming a common pain point for cement equipment manufacturers and cement plant maintenance teams. Vertical mills and roller presses continuously bear huge extrusion loads and periodic impacts during operation, and loads fluctuate with material thickness. Ordinary bearings have insufficient fatigue resistance and tend to form raceway indentation and rolling element surface peeling under long-term cyclic loads, triggering roller vibration and lowering grinding efficiency and stability of finished fineness. Heat continuously radiates from rotary kiln shells, raising operating temperature around supporting roller bearings, and conventional grease easily oxidizes and cokes under high temperature, leading to excessive temperature rise of bearings. Massive hard-edged raw meal and clinker dust floats in production areas. These powders feature strong abrasiveness and cannot be effectively blocked by simple seals. Dust penetrates into bearing housings, mixes with grease and forms persistent abrasive medium that continuously wears raceways and rolling elements. Ultra-fine cement dust easily adheres to seal lips and gradually invades seal gaps to accelerate seal aging and failure. Disassembly and assembly of large cement main machines are complicated, and shutdown for bearing replacement greatly reduces effective operating hours of production lines and continuously increases factory operation costs.

Focusing on transmission supporting field for cement building materials equipment, Japan NMT specially develops high-temperature dust-proof heavy-duty tapered roller bearings dedicated for rotary kilns, vertical mills and roller press production lines to solve industry pain points of ordinary cement equipment bearings such as insufficient heat resistance, easy ingress of hard clinker dust, fatigue damage induced by extrusion impact, high-temperature grease coking and limited service life under continuous grinding operation. Taking advantage of bidirectional linear load-bearing structure of tapered rollers, combined with five core upgrades including heat-resistant high-toughness refined bearing alloy steel, multi-layer labyrinth high-temperature dense dust-proof composite sealing, deep-hardening super-finishing technology for raceways, high-temperature dust-resistant long-life lubrication and precise clearance matching for cement working conditions, it fully adapts to harsh conditions of rotary kilns, vertical mills and roller presses with high-temperature radiation and interference of hard cement dust. It fundamentally solves problems including high-temperature grease coking, abrasive wear by powder, fatigue spalling and seal leakage, stabilizes rotation precision of all kinds of rollers and supporting rollers and guarantees long-cycle continuous production of cement clinker calcination and grinding lines.

Core Product Advantages

1. Bidirectional ultra-large combined load bearing withstands extrusion impact and dynamic axial thrust: Adopting tapered roller linear contact structure, it bears high-strength radial heavy loads and continuous axial thrust simultaneously with uniform load distribution in contact zones. It buffers periodic impact caused by material layer fluctuation, restrains excessive unilateral raceway wear induced by eccentric load of grinding rollers and supporting rollers, stably controls axial play of shaft systems and ensures stable operation of grinding systems.

2. Heat-resistant high-toughness bearing steel matrix delivers long-term fatigue and wear resistance under high temperature: Selected high-purity heat-resistant bearing alloy steel specially for heavy cement equipment undergoes deep quenching & tempering heat treatments to optimize high-temperature metallographic structure, improve matrix toughness, compressive strength and wear resistance under thermal conditions. It withstands long-term periodic extrusion impact loads and delays raceway fatigue damage and surface peeling of rolling elements.

3. Multi-layer labyrinth high-temperature dense dust-proof composite sealing blocks ingress of hard cement dust: Equipped with exclusive thickened wear lip & multi-labyrinth sealing structure for cement conditions. It resists hardening and aging under high temperature and intercepts ultra-fine hard powder such as raw meal and clinker layer by layer, preventing dust penetration into cavities to contaminate grease and avoiding persistent abrasive wear induced by hard powder particles.

4. Deep-hardening super-finishing grinding technology for raceways reduces frictional temperature rise and suppresses vibration: Deep hardening treatment plus micron-level super-finishing grinding is applied on contact surfaces of raceways and rollers to optimize contact profile, improve oil film forming performance under high temperature, reduce accumulation of frictional heat, slow precision attenuation during long continuous operation, lower roller vibration and stabilize particle size index of finished cement.

5. Customized clearance for cement conditions & high-temperature dust-resistant long-life lubrication system: Internal clearance is precisely matched according to different operating temperature and load of kiln supporting rollers, vertical mill rollers and roller press squeezing rollers to avoid seizure under low temperature and thermal expansion seizure under sustained high temperature. Matched with special lubrication formula resistant to high temperature and powder contamination, it adapts to high-temperature dusty environments in cement plants and extends online lubrication maintenance intervals of equipment.

Application Scenarios

Support bearings for rotary kiln supporting rollers and thrust rollers, grinding roller bearings for vertical raw mills and cement mills, squeezing roller support bearings for roller presses, end support bearings for cement ball mills, heavy-duty transmission supporting positions of all calcination and grinding heavy equipment on new dry-process cement production lines.

Precision Quality Assurance

NMT tapered roller bearings for cement building materials equipment are manufactured strictly in accordance with Japanese heavy building material equipment manufacturing standards. Selected special bearing steel with heat resistance, high toughness and dense dust & wear resistance undergoes continuous high-temperature temperature rise test, hard dust sealing durability test, alternating impact load fatigue test, continuous heavy-load operation test and high-low temperature cycle aging test. The products feature outstanding bidirectional load capacity, excellent thermal stability and reliable long-term dust-proof sealing performance, fully adapting to 24-hour non-stop calcination and grinding conditions with high temperature and hard dust in cement plants.

Product Range

Heavy-duty high-temperature resistant tapered roller bearings for kiln supporting rollers, long-life dust-proof bearings for vertical mill rollers, wear-resistant bearings for roller press squeezing rollers, low-vibration transmission bearings for cement ball mills, customized large-size non-standard tapered roller bearings for complete large cement production equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy cement calcination and grinding equipment under working conditions of continuous combined loads, high-temperature radiation from rotary kilns, hard raw meal and clinker dust, periodic extrusion impact and uninterrupted continuous production, specializing in core technologies of bidirectional load balance, high-temperature temperature rise control, dense dust-proof sealing protection and fatigue wear prevention. With Japanese heat-resistant high-toughness steel heat treatment technology, exclusive high-temperature dust-proof sealing technology for cement machinery and strict high-temperature dust condition simulation testing system, it accurately solves industry pain points of cement main machine bearings such as high-temperature grease coking, abrasive wear failure by powder, fatigue spalling and frequent maintenance shutdown, supplying high-load, high-temperature resistant, dust and wear-resistant long-life core transmission bearing components for global cement building material equipment manufacturers.