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8/8/2016
Checking the Spider Bushing on Sandvik Cones Pilot Crushtec
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Checking the Spider Bushing on the Sandvik Cones CH420, CH430 & CH440 What is the spider bushing? The Spider bushing is located at in the top shell and is responsible for supporting the top of the main shaft. The figure below shows a section view of the crusher and an ISO section of the cone body. The support from the spider bushing and inner eccentric can be observed.
Figure 1 above taken from the CH430 maintenance manual 1. Spider cap 2. Spider bushing 3. Head nut 4. Mantle 5. Concave ring 6. Mainshaft with head centre 7. Eccentric wearing plate 8. Bottomshell bushing 9. Eccentric 10. Eccentric bushing 11. Step bearing 12. Hydroset piston 13. Pinionshaft housing 14. Pinionshaft 15. Dust collar 16. Locating bar 17. Dust seal ring 18. Bottomshell 19. Topshell 20. Filler ring
Why the spider bushing is important? The Spider bushing has an hour glass figure and as such it has a very tight clearance. Once the spider bushing no longer supports the main shaft, the bottom of the main shaft exerts a large amount of force on inner eccentric bushing. Figure 3 below shows the logic behind the step bushing and the inner eccentric bushing. Imaging holding the bottom of the pencil securely and exerting a force as per the red arrows. This would cause large stress to be exerted at the bottom of the pencil. This is the same logic that applies when the spider bushing is worn.
Checking the Spider Bushing on Sandvik Cones Pilot Crushtec
Figure 3 taken from Sandvik training files What can happen when the spider bushing is not maintained? Burnt inner and outer eccentric bushing Sized main shaft Damaged main shaft and shaft sleeve Damaged step bearings Damaged locating bar In other words, not maintaining this item will cause serious damage to internal mechanical components of your cone crusher. How do you measure the spider bushing clearance and what should the clearance be? Drop the main shaft to the bottom position Stop the machine and implement a lockout procedure Ensure the crushing chamber is clean and remove the spider cap Use a clean bucket and collect the grease from the spider housing Inspect the grease and replace if necessary Mark the feeler gauge with the "L" length in table 1 below (use masking tape or a small Oring) Insert the feeler gauge until it reaches the "L" length on the top of the spider bush and check the clearance (start with a small feeler gauge and work upward). Check clearance around the entire diameter Inspect the spider bushing dust seal and replace if necessary Inspect main shaft sleeve and spider bushing for abnormal wear If clearance is correct then note it down in the log of the machine (best to keep a log for history on the machine) If the clearance is incorrect (exceeds "S" value in table 1 below) replace the spider bushing and recheck the clearance. If the clearance is still incorrect then the main shaft sleeve will need to be replaced Inspect Oring on spider cap and reassemble Check grease level in spider bushing and add if necessary
Figure 4 above show s the correct grease level (dotted line) in the spider housing taken from Sandvik training files "S" is the maximum clearance value between the spider bushing and main shaft sleeve at the fulcrum point. "L" is the distance at which the "S" clearance must be measured to obtain the fulcrum point. Table 1: CH420 S=1.6mm L=75mm CH430 S=1.9mm L=103mm CH440 S=2.1mm L=165mm
Checking the Spider Bushing on Sandvik Cones Pilot Crushtec
Figure 5 above shows the "L" and "S" measurements taken from Sandvik training files
Figure 6 above shows the use of a feeler gauge to measure spider bushing clearance How often should it be measured? Every 250 hours and every liner change Notes: Always refer to the Sandvik cone manuals specific to your machine for detailed maintenance guidelines
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