SANDVIK CH420:01, Installation Manual

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4. Installation preparations
51 CH420:01 © Sandvik SRP AB – Doc. no. S 223.510 en Ver. 1
Feed arrangements with EC or C crushing chamber
To prevent damage and/or unnecessary wear on the spider cap and arm
liners, the feed should be arranged so that the material falls onto a “feed box”
before it enters the crusher. This reduces the drop height and speed of the
material – particularly important with EC or C crushing chambers that are
fed with relatively coarse material. The feed box also reduces segregation.
With an EC or C crushing chamber, the mass and dimensions of the larger
feed lumps will be greater than with finer crushing chambers. Design the
feed box accordingly!
When processing coarse material, keep the level of material in the feed
hopper a little lower to prevent bridging.
You are welcome to contact Sandvik for advice on the design of feed
arrangements.