jaw crusher bearing block

The bearing block, a key component in jaw crushers, supports the eccentric shaft via bearings, enduring radial/axial loads. Constructed from QT500-7/HT350/ZG35SiMn, it comprises a bearing body with a precision bore (H7 tolerance), mounting flange, sealing grooves, and radial ribs. Manufacturing involves ductile iron casting (1350–1420°C pouring) with spheroidization, followed by precision machining (bore Ra ≤1.6 μm) and surface treatment. Quality control includes spheroidization checks (≥80%), dimensional inspection (coaxiality ≤0.05 mm), and load testing (1.5× rated load, deformation ≤0.05 mm). Critical for stable eccentric shaft operation, it ensures 3–5 years of service with proper lubrication, safeguarding bearing life and crusher efficiency.