Cone Crusher Eccentric Bushing
The cone crusher eccentric bushing, a core rotating component around the main shaft, is crucial for driving the crushing motion. Its main functions are generating eccentric motion (converting rotational motion into orbital movement of the main shaft and moving cone), transmitting torque, bearing loads (up to thousands of kilonewtons), and serving as a lubrication channel.
Structurally, it is a cylindrical or conical sleeve with an offset inner bore, consisting of components such as the bushing body (high-strength alloy steel or cast steel like 42CrMo or ZG42CrMo), eccentric bore (with 5–20 mm offset), gear teeth (involute profile, modulus 10–25), lubrication passages, flange/shoulder, and wear-resistant liner (bronze or babbitt metal).
For large bushings (outer diameter >500 mm), the casting process involves material selection (ZG42CrMo), pattern making (with shrinkage allowances), molding (resin-bonded sand mold), melting and pouring (controlled temperature and flow rate), cooling and shakeout, and heat treatment (normalization and tempering). The machining process includes rough machining, gear machining, heat treatment for hardening (induction-hardened gear teeth to HRC 50–55), finish machining (grinding to AGMA 6–7 accuracy), installation of wear-resistant liner, and balancing.
Quality control covers material testing (chemical composition and mechanical properties), dimensional checks (CMM and laser tracker for eccentricity and concentricity), hardness and microstructure testing, non-destructive testing (UT and MPT), and performance testing (rotational and load tests). These ensure the eccentric bushing meets precision and durability requirements for efficient cone crusher operation in heavy-duty applications
More
