Core equipment of cement production lines including vertical roller mills, roller presses, rotary kilns, grate coolers, cement ball mills and powder separators operate under harsh working conditions of continuous ultra-large alternating extrusion loads, high-temperature radiation from kilns, high-concentration cement dust, severe equipment vibration, frequent cold-hot alternation and uninterrupted all-weather operation. Cement production lines require extremely high continuity. Once bearing failure causes shutdown, the whole production line has to stop. Clinker inside kilns cools down and agglomerates, materials pile up inside mills. Restart takes a long time and leads to massive clinker loss and production decline. Ordinary cylindrical roller bearings cannot adapt to the harsh environment in cement plants, becoming a widespread industry pain point. Continuous huge extrusion loads and periodic impact are generated during material grinding in vertical mills and roller presses. Ordinary bearings have insufficient strength and tend to form raceway indentation and fatigue peeling under long-term stress, resulting in roller runout and reduced grinding efficiency. A large amount of hard cement dust suspends at production sites. The dust features high hardness and strong abrasiveness. Simple seals cannot block fine powder from penetrating into bearings. Dust mixes with grease and forms abrasive medium, rapidly wearing raceways and gradually expanding bearing clearance. Rotary kiln shells continuously radiate high temperature and transfer heat to supporting bearings. Conventional bearings have limited heat resistance. Long-term high temperature accelerates grease oxidation, coking and drying failure, easily triggering bearing overheating and seizure. Alternating cold and hot air flows exist in grate cooler areas, causing repeated condensation inside bearings. Water vapor mixed with dust forms mud and accelerates corrosion and abrasive wear. Maintenance procedures for cement equipment are complicated and shutdown costs are high. Frequent bearing replacement greatly increases spare parts cost, labor expenses and production loss.

Focusing on transmission supporting field for heavy cement industry, Japan NMT specially develops ultra-heavy-load high-temperature dust-resistant wear-resistant long-life cylindrical roller bearings dedicated for cement machinery to solve industry pain points of ordinary cement bearings such as insufficient load capacity, easy failure under high temperature, easy ingress of hard cement dust, poor vibration resistance and short service life under continuous field operation. Through five core upgrades including heat-resistant ultra-high-strength forged alloy steel matrix, multi-layer labyrinth dust-proof high-temperature composite sealing, surface anti-fatigue strengthening heat treatment for raceways, wide-temperature dust-resistant long-life lubrication and extrusion alternating load stress equalization optimization, it fully adapts to heavy-load, high-temperature, heavy-dust and strong-vibration working conditions of grinding, calcining and cooling equipment. It fundamentally solves problems including bearing impact damage, dust abrasion, high-temperature lubrication failure and condensation rust, supporting long-term stable continuous production of cement clinker production lines.

Core Product Advantages

1. Heat-resistant ultra-high-strength forged alloy steel matrix withstands continuous extrusion heavy loads: Adopting heat-resistant high-purity forged bearing alloy steel specially for cement heavy industry with deep quenching & tempering strengthening heat treatments to greatly improve structural toughness, compressive strength and fatigue resistance under high temperature. It bears long-term continuous extrusion impact loads of vertical mills and roller presses, effectively restraining raceway plastic deformation, fatigue peeling and component cracking.

2. Multi-layer labyrinth dust-proof high-temperature composite sealing blocks cement dust ingress: Equipped with exclusive multi-layer labyrinth and high-temperature wear-resistant lip sealing system for cement working conditions. It resists aging and deformation under high temperature, intercepts hard cement fine powder and clinker dust layer by layer, prevents dust from mixing with grease to form abrasive paste, reduces internal abrasive wear and extends sealing service life.

3. Surface anti-fatigue strengthening heat treatment for raceways improves wear durability: Precision 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 effectively slows precision attenuation under long-term continuous abrasion by hard dust and vibration and extends bearing service life.

4. Wide-temperature dust-resistant long-life lubrication system adapts to alternating cold and hot conditions: Custom lubrication formula developed for high-temperature, dusty and alternating temperature environments in cement plants features excellent anti-dust pollution, high-temperature oxidation resistance and anti-coking performance. It hardly emulsifies when exposed to moisture under alternating cold and hot conditions and continuously forms stable protective oil film, extending lubrication maintenance intervals.

5. Optimized structure for alternating extrusion loads evenly disperses vibration stress: Optimizing roller arrangement and internal clearance parameters to improve load distribution, relieve local stress concentration caused by continuous extrusion vibration during grinding, reduce precision loss from long-term cyclic operation and stabilize running smoothness of grinding rollers and kiln bodies.

Application Scenarios

Cement vertical roller mills, roller presses, rotary kilns, grate coolers, cement ball mills, cyclone powder separators, material conveying equipment, various supporting and transmission roller shaft parts of cement production lines.

Precision Quality Assurance

NMT heavy-duty cylindrical roller bearings for cement machinery are manufactured strictly in accordance with Japanese heavy cement equipment manufacturing standards. Selected special bearing steel with heat resistance, impact resistance, wear and dust resistance undergoes ultimate extrusion durability test, cement dust sealing durability test, continuous high-temperature temperature rise test, cold-hot cycle corrosion test and long-term vibration fatigue test. The products feature high load limit, stable heat resistance and outstanding dust-proof wear resistance, fully adapting to 24-hour continuous heavy-load production conditions with high temperature, hard abrasive dust and strong vibration in cement plants.

Product Range

Heavy-duty supporting cylindrical roller bearings for vertical mills, impact-resistant wear-resistant bearings for roller presses, high-temperature long-life bearings for rotary kilns, dust-proof bearings for grate coolers under alternating cold and hot conditions, transmission supporting bearings for ball mills, customized non-standard ultra-heavy-load bearings for cement equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy cement and building materials industry under high-temperature calcination, hard abrasive dust and continuous extrusion heavy-load working conditions, specializing in performance optimization under scenarios of high-temperature radiation, highly abrasive dust, alternating cold and heat and persistent vibration. With Japanese heat-resistant forged steel heat treatment technology, exclusive multi-layer dust-proof high-temperature sealing technology for cement working conditions and strict extreme working condition simulation testing system, it accurately solves industry problems of cement bearings such as abrasive wear failure caused by dust, high-temperature coking seizure, impact fatigue damage and frequent maintenance replacement, supplying high-load, high-temperature resistant and dust-resistant long-life core transmission components for global cement clinker and building material powder processing industries.