Upper head bushing

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Cone Crusher Upper Head Bushing

 

What is upper head bushing?

The upper head bushing is a component of a cone crusher that is located on the top of the head assembly. It is typically made of bronze or other copper alloys and is designed to provide a smooth and consistent surface for the head to rotate on.

The upper head bushing serves several important functions in a cone crusher. First, it helps to distribute the weight of the head assembly evenly across the top of the crusher frame. This helps to reduce stress and wear on the frame and other components.

Second, the upper head bushing helps to provide a stable and consistent surface for the head to rotate on. This is important for maintaining proper alignment between the head and the crushing chamber, which is essential for achieving the desired product size and shape.

Finally, the upper head bushing helps to protect the head assembly and other components from damage caused by metal-to-metal contact. By providing a smooth and lubricated surface for the head to rotate on, the bushing helps to reduce friction and prevent excessive wear and tear.

Overall, the upper head bushing is an essential component of a cone crusher, and its proper functioning is critical to the performance and reliability of the machine.

Upper head bushing removal

The upper head bushing which has an interference fit with the head is held in place by keys. If the upper head bushing is to be removed for replacement, turn the head upside down and proceed as follows:

  1. Thoroughly read the instructions LOWER/HEAD BUSHING REMOVAL found earlier in this section before proceeding, as many of the procedures such as «sawing» and «cooling» are the same for removal and installation of the UPPER head bushing.
  2. Remove the four keys which lock the bushing in the head by unscrewing the hex head capscrews, and discard the old lockplates. Since these capscrews were installed with Loctite, the capscrews must be heated with a torch to approximately 205° C (400° F) before they can be unscrewed.
  3. Remove the head bushing by sawing.
  4. Inspect the head bore for scoring, gouging, or rough spots. Also check the bore to be sure it has not worn oversize, or shrunk undersize, due to the presence of heat.

Upper head bushing installation

Install a replacement head bushing as follows :

  1. Clean the head bore and head bushing outside diameter using a wire brush.
  2. Cool the bushing in dry ice.
  3. Measure the bushing and head to determine when the bushing has cooled sufficiently.
  4. Use ring bolts to lift the bushing into position over the head bore.
  5. Quickly lower bushing into head until the bushing «bottoms» on the shoulder in the head bore, while at the same time, aligning the slots between the key retainers welded to the head and the four slots in the bottom of the bushing.
  6. Place the L-shaped keys into position using both the lockplates and hex head capscrews to lock the bushing in the head. Install the capscrews in the tapped holes in the head with Loctite 277, after cleaning the holes and capscrew threads with an oil-free solvent.
  7. After tightening the spline keys, pull on the stop flats over the attachments. Reinsert the lower head bush as instructed in this section.

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