What are the wear parts of a cone crusher and how often should they be replaced

Within mining equipment, the cone crusher stands as a highly efficient, low-energy-consumption, and high-quality crushing apparatus, particularly suited for materials of considerable hardness. During routine rock-crushing operations, component wear is an unavoidable aspect of cone crusher maintenance. So, what are the wear parts of a cone crusher? What impact might these have on the machine's performance? And how can one extend the operational lifespan of a cone crusher?

The cone crusher, also known as a cone breaker, cone machine, or cone-type crusher, primarily comprises a frame, horizontal shaft, moving cone, balancing wheel, eccentric sleeve, upper crushing wall (fixed cone), lower crushing wall (moving cone), hydraulic coupling, lubrication system, hydraulic system, and control system. During operation, the transmission mechanism drives the eccentric sleeve to rotate. The moving cone, compelled by the eccentric sleeve, performs a rotating swing motion. Materials undergo multiple squeezing and impact actions between the moving and stationary cones, resulting in fragmentation. Material crushed to the required particle size then falls under its own weight and discharges from the cone base.

Wear components of cone crushers: crushing chamber, crushing wall, concave liner, main shaft and cone sleeve, thrust plate and gear, frame and spherical bearing, eccentric sleeve and straight sleeve, shaft sleeve, cone sleeve. What roles do these components play in the operation of cone crushers? Let us now analyse this.

1. Crushing Chamber

The parallel zone experiences the most severe wear, with the fixed cone showing significant wear at the parallel zone inlet. The movable cone liner exhibits greater wear towards the upper discharge opening. Overall, wear in the parallel zone exceeds that in the upper chamber. Once worn, the crusher's chamber configuration changes substantially and loses its original shape entirely, severely compromising crushing efficiency.

2. Crushing Wall

The crushing wall is secured to the cone body via a cone head, with zinc alloy cast between them. As the critical component for compression crushing, damage renders it inoperable, causing shutdowns. After 6-8 hours of operation following replacement, the crushing wall's fastenings must be inspected and tightened immediately if any looseness is detected.

3. Cone liner

The concave and bowl liners are components in direct contact with the material and constitute the primary wear parts within the cone crusher. During operation, the concave liner follows a trajectory, periodically moving closer to and further from the bowl liner. Material is crushed through repeated compression and impact between these liners, with some material discharged through the external discharge opening. The concave liner can be replaced on-site. Unscrew the adjusting sleeve mounted on the upper frame (note: turn counter-clockwise), remove the upper chamber hopper assembly, and lift the adjusting sleeve using lifting equipment. After removing the bolts securing the adjusting sleeve support plate, the concave liner can be taken out for replacement. During reassembly, thoroughly clean the outer surface, apply grease to the threaded surface of the adjusting sleeve, and secure it by following the reverse sequence of disassembly.

4. Main Shaft and Cone Sleeve

Under normal operating conditions, both the main shaft and cone sleeve exhibit distinct wear marks approximately 400mm below the upper edge of the cone sleeve. Should the lower section exhibit heavier wear than the upper section, the moving cone may experience slight instability, preventing normal operation. If localised contact occurs between the shaft and cone liner at the lower end, the cone liner may crack and fail.

5. Thrust Disc and Gear

The thrust disc exhibits significant wear along its outer circumference. Due to the high linear velocity of the outer ring, wear occurs more rapidly than on the inner ring. Furthermore, misalignment of the eccentric sleeve exacerbates wear on the outer ring. During operation, the large cone gear rotates around the crusher with a radius equal to half the clearance of the straight sleeve. This induces additional impact vibrations and wear on the gear during operation, thereby shortening its service life.

6. Frame and Spherical Bearings

Wear on the spherical bearing shells progresses gradually from the outer ring towards the inner ring. During extended service, this may destabilise the moving cone, causing the main shaft to jam at the lower opening of the cone sleeve. This can lead to cracks and damage at the lower sleeve opening, potentially triggering runaway conditions. Beyond normal wear, damage to spherical bearing shells primarily manifests as cracking.

7. Eccentric Sleeve and Straight Sleeve

Wear on the eccentric sleeve manifests vertically along its height, with heavier wear at the top and lighter wear at the bottom. The degree of wear also diminishes progressively from top to bottom. During operation, the cone crusher frequently experiences upward displacement of the straight sleeve and cracking of the straight sleeve. Once the straight bushing has shifted upwards, it becomes more susceptible to cracking. However, once cracked, the resulting debris can cut into the surface of the frame's central bore, causing it to lose its roundness. This debris causes particularly severe damage to the eccentric bushing, deteriorating the entire machine's operating condition and potentially leading to serious accidents.

8. Bearing Sleeve

Wear on the bearing sleeve of a cone crusher severely impacts production. Once wear reaches a certain level, the sleeve must be replaced promptly. Replacing the sleeve requires specific technique: when removing it, first separate the cutting ring to prevent damage to the main shaft. Subsequently, rotate the sleeve counterclockwise using an iron rod to disengage it easily.

9. Cone Sleeve

Cone sleeves require regular inspection and timely replacement. Determine the replacement cycle based on the hardness of processed materials and daily operating hours. When replacing, prevent sleeve rotation by inserting zinc alloy inside. Ensure no gap exists between the cone sleeve and eccentric shaft of the cone crusher.

The above outlines key points regarding cone crushers. The crushing wall and concave liner constitute vital components and the most frequently replaced wear parts. During operation, ensure feed material complies with crushing specifications. Strictly prohibit introducing excessively hard materials, high moisture content, or non-crushable objects into the crushing chamber, as this may cause liner detachment, equipment shutdown, or other malfunctions. Note: Feed to the cone crusher must be uniform. Ore must be fed to the centre of the distributor plate. Material must not come into direct contact with the crushing wall and bowl liner to prevent uneven wear.

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