2026-08-05
NMT Ltd.
Corporate Communications Department
NMT Spherical Roller Bearings for Ball Mills, Heavy-Duty Dustproof Shock-Resistant Waterproof Bearings for Mining & Cement Tube Ball Mills, Overflow & Grid Type Ball Mill Bearings
1. Ball Mill Structure & Core Bearing Function
The feed end, discharge end, transmission end and auxiliary connection parts of the ball mill are all supported by spherical roller bearings. As the core load-bearing component, bearings bear the static and dynamic impact load of the cylinder, steel balls and materials, directly determining the operation stability, grinding efficiency and overall service life of the equipment. Bearing failure will directly cause the whole production line to stop, which is the key maintenance part of industrial and mining equipment.
Ball mills operate 24/7 under extreme working conditions including low-speed heavy load, high-frequency impact, dense dust, water vapor mixture, eccentric load, alternating vibration, temperature difference change and continuous high temperature. Ordinary bearings are prone to multiple failures:
• Ultrafine hard dust invades the cavity, causing abrasive wear, increased clearance and spindle shaking;
• Cylinder deflection and foundation settlement cause eccentric load, leading to roller overload and fracture;
• Continuous operation heat accumulation leads to grease carbonization, dry friction and high-temperature seizure;
• Frequent start-stop instantaneous overload causes surface peeling and structural loosening.
Ball mill bearing failure will trigger chain losses: 4-8 days of single equipment shutdown leading to raw material accumulation and finished material shortage; frequent bearing replacement increases spare parts cost; complex disassembly and hoisting maintenance raise labor cost; abnormal operation causes secondary damage to spindle, seal and reducer; increased operation resistance leads to excessive power consumption.
Super Large Self-Aligning Structure: Widened thickened double-row spherical rollers achieve ±5° large-angle self-aligning compensation, adapt to cylinder deflection and eccentric deformation, balance composite load and eliminate eccentric load damage. Thickened forged rollers enhance impact resistance and bearing capacity.
Integrated Brass Solid Cage: One-piece CNC machined brass cage with ultra-high rigidity, no deformation or fracture under severe vibration, high temperature and humidity. Accurately limits rolling elements to prevent spindle jamming accidents.
Working Condition Customized Clearance: C3 enlarged clearance for main bearings to compensate thermal deformation; C4 oversized clearance for transmission bearings to buffer vibration impact; standard clearance for auxiliary bearings to stabilize equipment operation.
5. Full Model & Full Position Selection Guide
Position Selection: C3 sealed heavy-duty bearings for feed/discharge end main bearings; C4 large clearance anti-vibration bearings for transmission end bearings; standard clearance wear-resistant bearings for auxiliary connecting parts.
6. Precision Manufacturing & Full-Dimension Factory Inspection
7. Enterprise Cost Reduction & Efficiency Improvement Value
8. Global Application Scenarios
9. Spot Inventory & Customized Service
六、日本語本文（全階層バージョン）
ボールミルは鉱山、セメント、建材、発電、化学業界の核心粉体粉砕設備で、横型管式ボールミル、オーバーフロー型ボールミル、格子型ボールミル、乾式・湿式ボールミルに分類され、鉱石粉砕、セメント原料加工、微炭製造、スラグ超微粉生産などに広く活用されます。
2. 八大過酷稼働条件と精密故障要因
3. 汎用軸受故障による生産損失
4. NMTボールミル専用軸受六大核心強化技術
ESR超高純度軸受鋼：エレクトロスラグ再溶解鋼を採用、多重焼戻し処理を実施。軌道深層焼入れで耐摩耗・耐疲労性に優れ、母材靭性でクラック進展を抑制、汎用軸受の4-6倍の耐用年数を実現。
階層型多層複合シール：稼働条件に応じた三段階シールシステムを搭載、ラビリンス+多層FKMオイルシールで粉塵・水蒸気・スラリーの侵入を完全遮断、防塵・防水二重保護を実現。
長寿命専用極圧グリス：高温耐乳化グリスを事前封入、高温炭化・水希釈に強く、潤滑膜密着力が安定、給脂周期を大幅延長し整備頻度を削減。
機種別選定：乾式微炭・鉱石ミル用防塵タイプ、湿式オーバーフローミル用防水強化タイプ、セメント格子ミル用耐衝撃タイプ、小型間欠ミル用汎用タイプ、大型管式ミル用超大高負荷タイプに分類。
互換性：汎用ボールミル装置の寸法に完全適合、主軸・軸受ハウジングの追加工不要、現場で簡単に交換整備可能。
鏡面超精研削で摩擦発熱を低減、シール面高精度加工で密着性を向上、低温応力除去処理で永久変形を防止。全製品は過負荷耐圧、高周波衝撃疲労、乾湿交代耐久、高温劣化試験を合格し、完全な品質証明書を付属、品質トレーサビリティを確保。
装置オーバーホール周期延長で停止損失を回避、予備部品調達コスト80%削減、人件費・揚重整備コストを低減、装置二次故障を防止、モーター電力消費10%-15%削減、長期的な省エネ・コスト削減効果を実現します。
鉱山選鉱湿式・乾式粉砕軸受、セメント原料・スラグミル高温防塵軸受、発電所微炭製造耐振動軸受、化学粉体粉砕防食防水軸受、冶金固廃再処理耐衝撃軸受、老朽ボールミル改造アップグレード軸受に適用。
汎用ボールミル軸受を大量在庫保有、迅速出荷に対応。超大径高負荷軸受、高温断熱軸受、防爆軸受、防食軸受など特殊仕様の特注製作が可能。専門エンジニアが一対一で選定方案を提供し、全ての軸受故障を根本解決、企業の総合運用コストを削減します。