The locking cylinder in a cone crusher is a critical hydraulic component that ensures the adjustment ring and main frame remain securely locked during operation, maintaining the crusher’s crushing chamber setting (CSS). Here’s a detailed breakdown:
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Function of the Locking Cylinder:
1. Secures the Adjustment Ring:
– The locking cylinder hydraulically clamps the adjustment ring (which holds the mantle) to the main frame, preventing movement during crushing.
– This ensures consistent crush gap settings for uniform product size.
2. Enables CSS Adjustment:
– When adjusting the CSS (Closed Side Setting), the locking cylinder releases pressure, allowing the adjustment ring to rotate (via the hydraulic motor or gears) to raise/lower the mantle.
3. Safety & Overload Protection:
– In case of an uncrushable object (tramp iron), hydraulic pressure in the locking cylinder can be released, allowing the .jpg)
ustment ring to lift (“ring bounce”) and prevent damage.
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Components & Working Principle:
– Hydraulic Pressure: Typically operates at 60–150 bar (depends on crusher model).
– Piston & Seals: The cylinder uses high-pressure seals to maintain clamping force.
– Control System: Integrated with the crusher’s hydraulic power unit (HPU) and PLC for automated adjustments.
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Common Issues & Troubleshooting:
1. Leaking Hydraulic Fluid:
– Check for worn seals or piston damage.
– Inspect hydraulic hoses/fittings for leaks.
2. Failure to Lock/Unlock:
– Low hydraulic pressure due to pump issues or solenoid valve failure.
– Contaminated oil causing valve blockages.
3. Excessive Ring Movement (“Ring Bounce”)
– Worn locking cylinder or incorrect pressure settings.
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Maintenance Tips:
✔ Regularly check hydraulic fluid levels and cleanliness.
✔ Inspect seals/pistons during liner changes.
✔ Monitor system pressure with gauges/sensors.
Would you like details on a specific brand/model (e.g., Metso, Sandvik, Symons)?