Crusher self-aligning roller bearings have the characteristics of strong load-bearing capacity, excellent self-aligning performance, outstanding impact and vibration resistance, and strong structural adaptability. The specific analysis is as follows:
Strong load-bearing capacity: self-aligning roller bearings are designed with double row rollers, which can simultaneously withstand large radial loads and bidirectional axial loads. The roller and raceway adopt a linear contact design, with uniform stress distribution, which can effectively disperse the impact force under high load conditions of the crusher and avoid failure caused by local overload. For example, the jaw support bearing of a jaw crusher needs to withstand periodic impact loads, while the self-aligning roller bearing can achieve a 30% -45% increase in rated dynamic load compared to ordinary bearings by optimizing the raceway curvature and roller length. Excellent centering performance: The outer raceway adopts a spherical design, with the curvature center coinciding with the bearing center, allowing for a coaxiality error of 1 ° -2.5 ° between the shaft and the bearing seat. This feature can compensate for shaft deflection caused by vibration, impact, or installation errors during the operation of the crusher, avoiding bearing jamming or edge contact. For example, the rotor speed of a counterattack crusher can reach 500-1000rpm, and the self-aligning roller bearings can ensure stable contact during high-speed operation through automatic self-aligning function. Outstanding impact resistance and vibration performance: The symmetrical spherical roller structure, combined with the movable middle retaining ring design, allows the two rows of rollers to evenly share axial loads and avoid stress concentration. Under frequent start stop or material impact conditions of the crusher, this structure can effectively absorb vibration energy and reduce sliding friction between the rollers and the raceway. For example, the eccentric shaft bearing of the cone crusher adopts SKL 239/600B-K-MB self-aligning roller bearing, which can withstand the impact force generated by repeated squeezing of materials in the crushing chamber through a special internal clearance design.
Strong structural adaptability: The inner hole offers two designs: cylindrical and conical. The conical hole taper includes two specifications: 1:12 and 1:30, which can be adapted to the installation needs of optical axis or stepped axis.
. When used in conjunction with a tightening sleeve or a retraction sleeve, it can achieve quick assembly and disassembly, making it easy to maintain the crusher. For example, after adopting SKL 231/800-K-MB self-aligning roller bearings in the PE1200 × 1500 jaw crusher of a certain iron mine, the bearing replacement time was shortened from 8 hours to 2 hours.Sealing and lubrication optimization: For the dust environment of crushers, some self-aligning roller bearings adopt a composite labyrinth sealing system, which can effectively block the intrusion of mineral powder with a particle size of ≥ 0.5mm.
. At the same time, the outer ring is equipped with lubrication grooves and three lubrication holes (later code W33), which can ensure sufficient supply of grease lubrication or oil lubrication and extend the service life of the bearing. For example, in the PF1820 counterattack crushing renovation project of a limestone crushing line in a cement plant in Shandong, SKL 22424-E1-T41D self-aligning roller bearings were used, resulting in a 15-20 ℃ reduction in bearing temperature rise and an 8dB reduction in equipment noise