...and banking if you care about money.

Troughed Belts:

Without any intermediary transition length the banking will reverse instantaneously. Edge strain will also reverse sharply. Designers of these contraptions always assured me that there was no possibility of disturbing the material. I took the pragmatic option to let them stand by their own cognisance.

Conveyors were, are and will be supposed to be straight. Straight lines are still the shortest distance between TWO points.

If you really want to do the sums consider that as the banking angle slackens the the idler pitch ought to change in sympathy. If you work towards having a pair of truly flat idlers that is all you need in theory. Why not just a single flat idler?

Pipe Conveyors:

Don't know. But I do care!

Recently the Consultant, FEED Contractor and EPC Contractor in Al Jubail all insisted that it was OK to use a banked discharge pulley, pulling over 200kN, so that they could squeeze the discharge into the space available. In four places. ■

Hi there Shakee..

The proof of the pudding is in the eating, as they say..

On my Dual Carry Conveyor, I put in a section of 10 compounded vertical and horizontal curves to swop the top and botton belts over.

I called this roller-coaster section the "Pretzel"

To keep the Pretzel as short as possible, I had no staright sections between any of the curves. Worked perfectly..

Cheers

Taggart LSL Tekpro ■

There are reasons to allow straight sections after negotiating a horizontal curve. Chief among them are the need to re-center the belt in the troughed idlers. Banked and highly banked rollers, depending on the degree of banking, may cause the ore cross-section to shift by rilling transverse to the belt axis. As such, the belt may not approach the head pulley centered and cause the associated problems.

It is always best to run the belt true to its idler center. After shift the ore charge off the belt centerline, it will likely not correct its track back to a true idler and belt coincendent center. ■

Originally Posted by louispanjang

...and banking if you care about money.

Troughed Belts:

Without any intermediary transition length the banking will reverse instantaneously. Edge strain will also reverse sharply. Designers of these contraptions always assured me that there was no possibility of disturbing the material. I took the pragmatic option to let them stand by their own cognisance.

Conveyors were, are and will be supposed to be straight. Straight lines are still the shortest distance between TWO points.

If you really want to do the sums consider that as the banking angle slackens the the idler pitch ought to change in sympathy. If you work towards having a pair of truly flat idlers that is all you need in theory. Why not just a single flat idler?

Pipe Conveyors:

Don't know. But I do care!

Recently the Consultant, FEED Contractor and EPC Contractor in Al Jubail all insisted that it was OK to use a banked discharge pulley, pulling over 200kN, so that they could squeeze the discharge into the space available. In four places.

Instantly is a little too quick. Nothing is instantly. Everything has a transition. Some short, some not so short. It takes know-how to pick it.

Pipe conveyors often have more difficulty with centered belt discharge than trough belts noted above. The pipe crossection will often twist the top seam off its ideal position, due to a poor belt design. The seam is opened at the discharge with a high bias to one-side as per the seam dictates. Then, you have the problem of off-center discharge or worse with the belt folding and returning with a captured load - big problem. Hire a professional that knows the ropes or pipes, or troughs as they say. ■

Hi All..

The multiple horizontal curves on each strand of The Dual Carry Conveyor I mentioned above, bank at 10 degrees one way, then immediately bank 10 degrees the other way, and then once again bank 10 degrees back again. In this way, the two belts snake around each other.

NO STRAIGHT BITS!

I wrote a paper on this, and presented it with my very good friend Graham Shortt, at Beltcon 12

I have a photo of this, but it isn't on my new laptop, so I will dig it out next week.

Cheers

Taggart LSL Tekpro ■