What is the recommended installation procedure for the Movable Cone Upper Bushing?

Installation requires cleaning the shaft and bushing bore with a solvent to remove contaminants. Apply a thin layer of anti-seize compound to the shaft, then press the bushing into place using a hydraulic press with a mandrel that contacts the bushing's face uniformly. Ensure the bushing is seated squarely to avoid misalignment. After installation, check the clearance with a feeler gauge; it should be 0.10-0.15mm. Lubricate with ISO VG 220 gear oil before startup. During the first 50 hours of operation, monitor temperature and vibration to ensure proper seating. Re-torque mounting bolts after 100 hours.

How do I determine when to replace the Movable Cone Upper Bushing?

Replace the bushing when the clearance exceeds 0.25mm or when wear exceeds 0.5mm on the inner diameter, as measured with a bore gauge. Visual inspection for scoring, cracks, or embedded particles larger than 1mm also indicates replacement. In typical mining operations, the bushing lasts 6-12 months depending on load and maintenance. Keep a maintenance log to track wear rates; a sudden increase in vibration or temperature can signal imminent failure. Always replace the bushing in pairs with the lower bushing to maintain alignment.

Can this bushing be used in high-speed cone crushers?

Yes, the CuSn8 alloy and precision machining make it suitable for high-speed applications up to 500 rpm, provided proper lubrication is maintained. The bushing's thermal stability up to 200°C and low friction coefficient (0.08-0.12) help manage heat generation. However, for speeds above 400 rpm, we recommend the optional version with lubrication grooves to ensure adequate oil flow. Always verify the crusher manufacturer's specifications for maximum speed and load ratings. Regular oil analysis can help detect wear and prevent unexpected failures.

Movable Cone Upper Bushing

Precision-Fit Movable Cone Upper Bushing for Cone Crushers – 120mm ID, Tin Bronze Construction

The Movable Cone Upper Bushing is a critical wear component engineered for cone crushers, providing a precise interface between the movable cone shaft and the main frame. Manufactured from high-grade tin bronze alloy (CuSn8), this bushing offers exceptional load-bearing capacity and resistance to galling under high-pressure crushing operations.

Material

Tin bronze alloy (CuSn8)

Inner Diameter

120mm

Outer Diameter

150mm

Hardness

HB 70-90

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Why Choose the 120mm ID Movable Cone Upper Bushing for Your Cone Crusher?

The Movable Cone Upper Bushing with a 120mm inner diameter is a precision-engineered component specifically designed for cone crushers in the mining and aggregate industries. This bushing serves as the upper support for the movable cone shaft, maintaining alignment and absorbing radial loads during crushing. Its tin bronze alloy construction (CuSn8) provides a balance of strength and conformability, allowing it to withstand pressures up to 25 MPa while resisting seizure. The 150mm outer diameter and 120mm height ensure compatibility with popular crusher models, such as Sandvik CH660 and Metso HP400, where precise fit is critical to prevent premature wear. Unlike generic bushings, this component is machined to ISO 2768-m tolerances, ensuring a clearance of 0.10-0.15mm for optimal lubrication and heat dissipation.

In typical applications, the movable cone upper bushing addresses the challenge of maintaining concentricity under high crushing forces. In hard rock mining, crushers operate continuously, and misalignment can lead to costly downtime. This bushing's bronze matrix embeds fine particles, reducing abrasive wear and extending replacement intervals. It is particularly suited for secondary and tertiary crushing stages where throughput and reliability are paramount. The material's thermal stability up to 200°C ensures performance in hot climates or underground mines, while its low friction coefficient (0.08-0.12) minimizes energy loss. By choosing this specific size, operators avoid the risks of oversized or undersized bushings that can cause vibration, excessive clearance, and premature failure of adjacent components.

Compared to other bushings in the series, the 120mm ID variant is optimized for mid-sized cone crushers with throughput capacities of 200-400 t/h. Its wall thickness of 15mm provides a balance between load distribution and heat dissipation, unlike thinner bushings that may deform under peak loads. The height of 120mm ensures adequate support length, reducing edge loading and extending the bushing's life. Additionally, the CuSn8 alloy contains 8% tin, offering superior hardness (HB 70-90) and corrosion resistance compared to leaded bronzes, making it suitable for wet or dusty environments. This bushing is also available with optional lubrication grooves, further enhancing its performance in high-speed crushing circuits.

Precision machining to ISO 2768-m tolerances ensures a clearance of 0.10-0.15mm, reducing vibration and extending bearing life by up to 30%.
Tin bronze CuSn8 with 8% tin content provides a hardness of HB 70-90 and a compressive strength of 600 MPa, outperforming standard bronzes in high-load applications.
Self-lubricating properties and ability to embed particles reduce wear rates by 40% compared to steel bushings, lowering maintenance costs.

Core Technical Features and Quantified Advantages

STEP 1

CuSn8 Tin Bronze Alloy with 8% Tin Content

The bushing is cast from CuSn8 alloy, containing 8% tin, which provides a hardness of HB 70-90 and a compressive strength of 600 MPa. This composition offers superior wear resistance and fatigue strength compared to leaded bronzes, ensuring reliable performance under high crushing forces. The alloy's thermal conductivity (50 W/m·K) aids in heat dissipation, reducing operating temperatures by up to 15°C in continuous duty cycles.

STEP 2

Precision Bore Tolerance of 0.10-0.15mm Clearance

Machined to ISO 2768-m tolerances, the 120mm inner diameter maintains a controlled clearance of 0.10-0.15mm when paired with a standard shaft. This precise fit ensures proper lubricant film formation, reducing metal-to-metal contact and extending bushing life by up to 30%. The tight tolerance also minimizes vibration, which can cause premature failure of adjacent components like seals and bearings.

STEP 3

Embeddability for Contaminated Environments

The bronze matrix can embed foreign particles up to 0.5mm in size, preventing them from scoring the shaft or causing abrasive wear. This property is critical in mining and aggregate operations where dust and fines are prevalent. By trapping contaminants, the bushing maintains a smooth running surface, reducing downtime for cleaning and replacement by up to 25% compared to non-embedding materials.

STEP 4

Thermal Stability from -40°C to 200°C

With a coefficient of thermal expansion of 18 µm/m·°C, the bushing maintains dimensional stability across a wide temperature range. It operates reliably from -40°C in cold climates to 200°C in hot processing environments, without loss of mechanical properties. This makes it suitable for both surface and underground mining applications, where temperature fluctuations are common.