Originally Posted by speed401

Hi,

It seems common to hang underground conveyor belt structures

from the roof at inclined suspension chain angles of 10 to 15 degrees.

Would the inclined suspension chain angle produce conveyor structure "sway

when an off-centered load is conveyed?[/QUOTE]

[/QUOTE]I.E. as the off-set load travels forward would the belt try to

rotate/sway towards the off-set load's center of gravity?[/QOUTE]

[/QOUTE]Would straight vertical suspension chains be a better proposition?"

Right angle chain brackets with a key hole slot or crucifix are used

to suspend the chain."

Does this setup produce a moment on the hanging bracket which can

cause suspension roof bolt fatigue failure?[/QUOTE]

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about this:

The ore would eventually become centered inthe trough unless the belt

had sagged to one side.

Was a larger/wider belt installed previously along this conveyor route??

We always, always, always, hung our chain supported belts with

vertical identical length chains.

The cable supported belt is always tight, linear and anchored at the

tail pulley and drive unit.

The only time a chain suspended cable supported belt fails is when the roof fails or

the belt is loaded so heavily that the continued wieght bears down on the total wieght

of the top strand, troughing idlers, wire rope cable, return idlers, and bottom strand of belt.

OR the mechanical anchors are too short UGH!!

AND the end result is a bugger!!!!!!!!!!!!!!!!!!!!!!

The question is whether the right bolt being a mechanical or resin bolts are used comes

into play as the rock above the conveyor flight route is the issue. ■

We always installed our conveyor support chains vertical and added sway chains at 45 degrees every 150 to 200 feet along the conveyor (sway attachment was at the same location as a vertical support). If your conveyor has a walkway you can get swaying even from someone walking along the conveyor as their weight shifts from one foot to the other. I have experienced this myself while walking along a conveyor that was fully suspended for almost 4000 feet.

We only used "key hole" chain brackets on the sway chains. The main support chains were a steel angle (designed with a shackle mount) bolted to the back with 2 roof bolts and a shackle to connect the chain to it. Each support location was surveyed in to the exact location to ensure they were vertical when the conveyor was installed. ■

I always enjoyed giving the newbies the willies when three or

more of use would walk in cadence on the roof bolt suspended

tripper belt over the surge bin. ■