1. Typical Heavy Industry & Mining Equipment Failures

Jaw crushers, cone crushers, ball mills and large conveyors suffer instantaneous impact load from ore crushing and elastic bending of main shafts. Shaft misalignment caused by foundation settlement and frame deformation leads to edge stress concentration on ordinary roller bearings, resulting in raceway spalling and bearing fracture.

Mine dust, slurry and muddy water penetrate bearing housings, emulsifying grease and breaking lubrication oil film, triggering rust, pitting and excessive clearance. Continuous heavy-load operation causes heat accumulation, grease carbonization and bearing seizure to halt the whole production line. Low-quality spherical roller bearings feature loose metallurgical structure, leading to roller breakage and cage rupture under cyclic impact, bringing high hoisting maintenance costs and huge production loss.

2. Core Product Advantages: Double-Row Spherical Roller & Outer Ring Raceway for Self-Aligning, Impact Resistance, Mud-Dust Sealing & Long Service Life for Mining

NMT 22320 spherical roller bearing adopts double-row spherical rollers and integral spherical outer raceway to automatically compensate shaft misalignment within 2°, eliminating edge overload. Nine reinforced manufacturing processes: ESR remelted bearing steel, carburized hardened raceways & rollers, precision symmetrical spherical rollers, solid brass machined cages, thick steel labyrinth seals, large grease reservoir, cryogenic stress relief, phosphating anti-rust and factory preloading running-in.

Compared with ordinary heavy-duty roller bearings: 230% higher self-aligning capacity, 195% stronger peak impact resistance, 180% improved mud & dust sealing, 110% larger grease storage, maximum continuous working temperature up to 150°C, over 160% longer service life. It solves eccentric wear, impact fracture, slurry corrosion, grease carbonization and bending shaft bearing damage, cutting unplanned downtime and heavy equipment overhaul costs for mines.

3. Model Classification & Working Condition Selection Guide

NMT 22320 has multiple variants: open type, CA brass cage, CAK tapered bore with adapter sleeve, W33 outer ring oil groove & hole, ZZ double steel shield, C4 extra large clearance.

Open 22320 CA: Ball mill main shaft for centralized high-pressure grease lubrication.

22320 CAK tapered bore: Conveyor drum for easy mounting on plain shafts without shoulder machining.

22320 W33: Crusher eccentric shaft for online grease replenishment through annular groove.

22320-ZZ sealed: Underground conveyor & wet ore drum to block slurry intrusion.

22320 C4 extra clearance: Crusher main shaft & elevator to accommodate thermal expansion and deformation.

Application selection tips:

Jaw/cone crusher eccentric shaft: 22320 CA W33 C4 for impact load and online lubrication

Horizontal ball mill: Open 22320 CA for 24/7 continuous operation with large grease capacity

Mine belt head drum: 22320 CAK for fast maintenance disassembly

Wet washing drum: 22320-ZZ anti-slurry sealed type

Sintering rotary kiln: C4 open bearing for high-temperature heavy deformation

Custom stainless steel, carburized reinforced and thickened roller impact-resistant bearings are available.

4. Premium Material & Heavy-Duty Heat Treatment

Inner/outer rings and rollers are made of ESR high-purity bearing steel to limit inclusions and fatigue crack expansion. Integral quenching plus surface carburization achieves hard wear-resistant surface and tough core to avoid brittle fracture under impact.

Precision profile grinding for spherical rollers ensures full fitting with outer spherical raceway for uniform stress distribution. One-piece brass machined cages outperform stamped steel cages in anti-vibration, anti-tear and high-temperature creep resistance.

W33 oil groove with precision boring enables uniform grease distribution for full oil film protection. Thick steel shield plus labyrinth structure blocks coarse ore dust without internal grease pressure buildup. Dual phosphating & passivation anti-rust treatment prevents oxidation for outdoor and underground storage.

5. Structural Assembly Advantages & Quality Control

The spherical outer ring realizes passive self-alignment to tolerate frame deformation and shaft bending, lowering assembly precision requirements and omitting complex shaft alignment during on-site maintenance.

Dual-row roller layout delivers ultra-high radial load capacity and moderate bidirectional axial force bearing to buffer startup impact and axial float of grinding mills. Finished bearings pass roller contour inspection, spherical fitting test, clearance grading, impact simulation and lubrication channel inspection for stable batch performance.

ISO & GB standard dimensions support direct replacement of imported and domestic bearings without reworking housings or main shafts during crusher and mill retrofitting.

6. Wide Application Coverage

Ore Crushing Equipment: Jaw crusher, cone crusher, impact crusher main eccentric shaft bearing

Mineral Grinding Equipment: Horizontal ball mill, rod mill, AG/SAG mill shell main bearing

Mine Conveying Equipment: Main belt drum, bend pulley, bucket elevator top & bottom bearing housing

Metallurgical & Sintering Equipment: Sintering drum, rotary kiln support roller, hot rolling mill back-up roll

Building Materials & Cement: Vertical cement mill, rotary kiln, dryer drum, sand making machine spindle bearing

Coal Mining Equipment: Scraper conveyor, transfer machine, underground belt, coal washing wet drum bearing

Port Heavy Equipment: Ship loader, belt transfer drum, stacker-reclaimer traveling support bearing

7. Dimensional Interchangeability & Mining-Oriented After-Sales Service

NMT 22320 complies with ISO and GB spherical roller bearing standards for direct interchange with mainstream mining bearings for emergency rush repair. Standard models are in stock, customized heavy-duty bearings have short lead time.

Each bearing undergoes five strict factory inspections: roller flaw detection, self-aligning performance test, clearance grading, sealing durability and high-temperature endurance test, with material and heat treatment certification provided. Professional heavy machinery engineers configure clearance, seal type and lubrication scheme based on impact load, humidity and continuous operation to resolve edge spalling, impact breakage, slurry rusting and thermal seizure. The solution shortens equipment downtime, reduces large hoisting maintenance expense and monthly bearing consumption for mines, cement plants and metallurgical enterprises to guarantee continuous production.