Bearings for Mining Applications

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NTN Mining ApplicationMining Crushing Transfer ProcessingPLUMMER BLOCKSCAT. NO. 2500/EFeaturesApplication ExampleTightening boltThe bolt protects theplummer block againstloosening due tovibration and impact.Oil fill plugFor relubrication.SealExcellent sealing performance.AdapterSimplifies installationof the bearing.Spherical rollerbearingSelf-aligning ball orspherical roller bearingis built into plummer block.Mounting boltholesAllow easy positioningand installation.Trunnion bearing of ball tube millOil drain plugFor draining old lubricant.Plummer block unitDesigned for greater mechanicalstrength, and manufacturedunder strict quality control program.To suit the intended application, it canbe made of either spheroidal graphitecast iron (ductile cast iron) or cast steel.Dowel ballThe upper and lower housingscan be assembled together athigher accuracy by ball-dowelsystem using steel ball.Also, the upper cover can beinstalled or removed easily.Supporting roller of tube mill11
NTN Mining ApplicationMining Crushing Transfer ProcessingBEARINGS with SOLID GREASECAT. NO. 3022/EFeatures"Solid grease" is a lubricant essentially composed oflubricating grease and ultra high-molecular-weightpolyethylene. Solid grease has the same viscosity asordinary grease at normal temperature, but as aresult of a special heat treatment process, this greasesolidifies retaining a large proportion of thelubricant in it. By this solidification, the grease does noteasily leak from the bearing, evenwhen the bearing is subjected to strong vibrations orcentrifugal force.Solid grease lubrication1. Reduced lubricant leakageBecause the base oil is retained in a solid form, it is lesslikely to leak out of the bearing. During operation,temperature rise and/or centrifugal force will cause agradual release of the base oil into the rolling surfaces.Eliminating grease leakage from the bearing ensures aconsistent supply of lubricant and prevents contamination ofthe surrounding environment.2. Superior lubricationBearings with solid grease resist grease leakage prolongingbearing life in applications where high centrifugal force orvibration are present. The solid lubricant does not emulsifywhen exposed to water also extending both grease andbearing life.3. Sealing effectThough solid grease protects a bearing against ingress offoreign matters (water, dust, etc.), it is not an effectivesealing device. Therefore, for applications that need reliablesealing performance, we recommend the use of contact typerubber seals (deep groove ball bearings, bearing units) orother seals (other bearing types).Solid grease bearing for swing machinery12
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Bearings for Mining Applications

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