Kleeman Mobirex MR 110 Z. Serial Number: K0170023. The Final conveyor belt keeps pulling to one side. I have adjusted the belt tension from the top of the conveyor, angled the rollers, moved the whole belt frame side to side on the 2 support pins. I have dropped the entire belt frame and taken off the bottom roller. The bearings in the bottom roller look fine to me, but I am replacing them anyway. Are there any other suggestions on what may be causing this? Thank you
Is your tail pulley a self cleaning pulley?
Yes, it is self cleaning.
Make sure none of the rungs are bent on the tail pulley, check that your belt wiper is in good order at the head pulley. Check head pulley for build up of material on the drive surface. (Especially if you are working FRAP)
The tail pulley rungs looks fine. Head pulley has no material stuck behind it, but the head pulleys wiper is destroyed from patches we put in the belt. Would that affect anything?
Not the wiper so much as the patches. Did you skive the belt when patching or does she have big ol pooched out swollen scars? Are we talking repaired tears from rebar or complete sections ? Can you attach a pic?
The machine has a brand new belt on now and it has the same problem. But this is what the old belt looked like. Multiple repairs similar to these. No section repairs, only rebar rips.
Which end is worst, head or tail?
Worst in what terms?
Which end has the belt crawling to the side, head or tail or even end to end?
Sorry. Tail end is the problem. No matter how much or which way we adjust the head, same problem.
So, new belt can't be trained. Back everything up. First, measure from center of tail pulley shaft to center of head pulley shaft. Make sure both sides are equal. This could be a challenge with the electric drive in the way. Back the head pulley off so that you can see and even turn the tail pulley. Straight edge the bars of the tail, make sure none are bent or folded over. Measure circumference of each side. There can be no difference. ⅛ to ¼ of an inch will aggravate training. Is the tail pulley centered in the conveyor frame? Adjust head pulley take up so that the belt has droop on the bottom and has just enough tension to not slip. Check that your belt skirting is not set too low causing a drag on the belt. If the tail is carrying the belt to the side and you've pitched the return rollers 100% in the opposite direction, it really looks like you have a damaged tail pulley. Sometimes in transport when they split the screen box and underscreen conveyor, they knock stuff around or tie it down too tightly instead of blocking it up.
Before I dropped the belt frame, I could see the belt frame did not appear centered in the conveyor frame. I cant remember the measurements, but it was off. I tried to compensate for that by pushing the belt frame side to side on the support pins that hold the belt frame up, but no luck. I will take more measurements today. There also looked to be shims in between the tail pulley bearing housings and the belt frame, but no parts diagrams call for any there. I will try to send pictures later.
Those should be pillow bearings with set screws. I'm gonna bet that the dust cover popped off the roller cage. Now, along that thought, make sure the bearing hasn't failed altogether.
Nightmares of Quarry work running thru my head!!!
Both bearings look fine, nothing missing, marred or overheated looking. Slight side to side play, but they’re spherical bearings, so I assume that’s normal? The grease consistency on the side the belt pulled towards is thicker than normal and the opposite bearings grease is more watery than normal.
Ok, looking at the parts diagram, the tail pulley has a tapered locking collar to position the pulley on the shaft. Perhaps the spanner nut has backed off.
Can you attach a picture
There is the nut and locking tab. You can see that the nut must have backed off. The belt was pulling to the left, this was the right side bearing. Wouldn’t it want to go to the right side if that side was loose? Also, is there a torque spec that these nuts should be torqued to?
There's a tapered lock sleeve that the nut causes to bind on the shaft, that's what locates it. So I'm guessing you're going to want to get the belt off and center her up. Then lock that nut, but this time fold more than 1 lock tab. Good luck. Good catch
When rolling stock work slowed would end up working as extra hands for maintenance. Conveyors always took a beating. Had roughing screens fresh off crusher. A few had alternate source feeds as shot wall was prescreened. Out of five to nine conveyors always one going down mid day as tricks roll in for stone. Haul trucks dumped into a common feed chute at top of wall, prescreen would separate crusher feed from separable sized materials. Crusher run then had its own belts to screens to stockpiles. Rollers would fail, smoke was a good hint. Motor failures tended to be spectacular. Belting ripped, welds or transit supports would fail or buckle, corrosion a constant companion. Always had belting leftovers for spare creepers and parts tear down benches. Always a mountain of scrap somewhere on the yard.
Not a fan of field conveyors . 400 ft run of belt meant a lot of work to get her spliced back together. Yeah, no. Not my bag.
Lots of people, come alongs, clamps, usually a crane involved. Tension weight was always a load of fun. Screen bars beat to a pulp, fail into the conveyor, job boss whining about changing out bolts like it was coming out of his pocket.
https://goo.gl/maps/9qnvWuSPj9P33whR8 start at due north, turns west, and then angles NW. There are (2) conveyors I can see, I estimate about 8 miles.
I take it Harrison Mine is Long Wall shallow seam, Mine to Mouth facility. Lots of conveyor to keep functional. Wash plant is break point?