Originally Posted by blakeyg

Dear all,

I have a situation in an underground mine where I have to load onto a vertical curve. ....

Why? What is the zone restriction in operation?

After that, why should there be a problem if the radius is so large?

Where is the loading taking place, ie how far up the curve etc etc?

Is the belt already part loaded when it gets to the point under consideration?

Your 1)would be a geometric requirement,sort of

your 2)means the belt might never run

your 3)is standard practice

your 4)is very true. Hold down rollers are very troublesome.

If the curve is really big you could try lifting and flattening the belt line through the loading length. (or dropping the idlers at each end) Curved sections are usually made by stringing straight segments at angular increments so there shouldn't be much involved in getting the belt onto a flat (never said level) line for a while. If indeed the idlers are even packed up from the stringers to get closer to the true curve.

Nice thread.■

Gareth

Are you still at CW BTW?

Perhaps some thoughts are..

flexible rubber skirts to take up the vertical movement - if you know what this will be

hold down roller at end of the skirts - I have done this where stacker came very close to feed end - lift off at start > not the best > can be messy...had no choice

remove curve and have a fixed tripper and 2 straight sections.

relocate feed point

look at VFD drive or similar.

Is this new feed point the first feed point to the conveyor - if so, then you may have some more options wrt using inverted slider bars...

Cheers

JM ■

I think you mean your radius is too small.

Do you have the room to flatten the curve? Meaning increasing the radius by

shimming idlers to a new larger radius line.

Increasing the radius to a point where the belt does not lift off the rolls is your best method. If there is not enough room to do this then I would not recommend using that area as a loading pioint. ■

Gareth

Go with Gary's suggestion - increase the radius

I was not suggesting split belts - just a fixed tripper - change point - 2 HT pulley tho.

I have not used inverted slider bars before. I have used a hold down wheel assy at the end of feed skirts where the stacker was laid out too close to the feed point of the yard conveyor > severe lift up and into the skirts on empty start.

If the new loading point is not the first loading point > then I would be concerned with spillage at new skirts.....you may wish to think about looking at 5 roll trough in this area > get the belt edges up....this may alleviate the need for contact type skirt seals....as this is in the curve..you will need to relook at belt tensions as the belt will form a deeper section

I work at Cement Aust.

Thanks

James ■

Hi Garreth..

Have you considered softening the start up of the conveyor in question?

You could also maybe drop T2 a bit as well.

Next time you replace the belt, use a heavier one perhaps

Cheers

LSL Tekpro ■