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Archive for August, 2008
Roller Replacement Parts / Inquiry for Consultant
Posted by Woodrow from Houston, TX, US on August 20, 2008
I’ve recently taken over a Mexican company that mines, crushes and sells silica fines. The company operates two roller crushers that were fabricated onsite using, I’m told, “standard size” rollers that measure 1.4 meters. Do such “standard size” rollers exist and are replacement rollers easily obtained? Additionally, I would like to retain an expert to consult on these operations. Can you suggest someone?
There are several manufacturers of roll crushers that use roll shells in the range of the 55.118-inch diameter you note, and any of these manufacturers’ parts could have been used in the fabrication of your machines. The manufacturers and sizes of this kind of common roll crusher are as follows (in all cases the first numbers represent the outside diameter of the machine, while the second numbers define the width, typically in inches):
Cedarapids made a 55x30 model
Krupp makes a 1.4m x .8m machine
Pioneer Engineering made a 54x24 model
Traylor Engineering made 54x24 and 56x22 models
Universal Engineering made 54x24 and 54x30 models
Although all of these models share a common smooth outside diameter, each will have completely different inside diameter details. The seating locations, widths and machined angles will differ considerably. Some will incorporate internal anti-spin keying of varying means.
While they look similarly simple on the outside, the inside detail is more complicated. This leads to the difficulty in identifying which one was used in designing your machines. If the roll shells used weren’t identified clearly elsewhere, the only source of proper identification will be cast in the part on the inside, usually somewhere between the mounting seats. There’ll be a parts number and manufacturers name on the part in either raised or recessed letters.
You’re dealing with $20k to $25k per piece parts here, so care will need to be taken with the identification process, and disassembly will be required to obtain this information, if it’s not recorded elsewhere. With the silica material you’re processing, use of a high hardness alloy steel or iron may be in order, rather than conventional manganese parts for optimum service life. We’ve had considerable experience in the manufacturing and application of roll shells in more unusual applications.
In regards to the consultant end of your question -- without knowing the specific area of expertise you require, you’d likely do well there in Mexico, by contacting Aggregate and Mining Supplies de Mexico, located in Irapuato, Mexico. They may be able to offer you direction on that subject. Thank you for your inquiry.
Stationary Jaw Wearing with Hook at Bottom
Posted by Don from Chicago, IL, US on August 13, 2008
Why does the stationary jaw wear with a hook at the bottom and not allow material to fall out like it should? The rate is only three-quarters of what it was when the jaws were new.
Getting a jaw crusher to wear the ends off properly is similar to finding the proper match point on a set of cone crusher liners.
The jaw crusher was designed around an ideal closed side setting (C.S.S.). Deviation from that position diminishes the totality of jaw end wear. A hook forming on the stationary tells us that the crusher is being run at a closer C.S.S. than it was intended.
Whether that's right or wrong, it is what it is. We've altered and made special end details on many movable and stationary jaw dies, by either lengthening or shortening, to correct chronic match point issues. Length of the toggle plate and range of adjustment of the crusher affects the way the jaws align at the discharge end, as much as the way the material being crushed is reduced. If lower jaw mis-match occurs enough to affect output rate, try to correct with toggle plate and adjustment settings. If that doesn't fix things, a special length jaw can be made.
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