Originally Posted by deepakvermaa

Respected Sir,

After so much positive replies and support that I have received

from you all time to time, I would like to put forth one more

problem that we are facing in our travelling tripper!

We have 2 Bunker conveyors (1000TPH) with 2 Travelling Trippers

on each Conveyor.

In Travelling Tripper#1 Whenever the feeding exceeds 700TPH,

the Belt gets swayed in the inclined portion to the extent that

Coal spillages starts from one side, whereas in Travelling Tripper

#2 we never face this problem.

In Travelling Tripper#1, the Belt always travels in centre and sway

is observed only when the feeding exceeds 700TPH.

I have inspected both Trippers for Pulleys and conveyor Centre Line

for any deviation and compared the same with the Rail on which the

Tripper travels. The offset readings were found well below the tolerances.

Request your expert suggestions to find the Root Cause and rectify the same...

Namaskar DeepakVerma,

I am glad to see that the steel work is still within tolerance and

the steel has not wracked over time.

The first thing that comes to mind is the age of the belt

and its stretching becoming more elastic due to excess tonnage.

Is there a swiveled training troughing idler near the head pulley of the trippers carriage?

If not there should be one.

I would examine the belt carcass on the carry side to check for cracking and stress. ■

 

Originally Posted by deepakvermaa

Respected Sir,

After so much positive replies and support that I have received from you all time to time, I would like to put forth one more problem that we are facing in our travelling tripper!

We have 2 Bunker conveyors (1000TPH) with 2 Travelling Trippers on each Conveyor.

In Travelling Tripper#1 Whenever the feeding exceeds 700TPH, the Belt gets swayed in the inclined portion to the extent that Coal spillages starts from one side, whereas in Travelling Tripper#2 we never face this problem.

In Travelling Tripper#1, the Belt always travels in centre and sway is observed only when the feeding exceeds 700TPH.

I have inspected both Trippers for Pulleys and conveyor Centre Line for any deviation and compared the same with the Rail on which the Tripper travels. The offset readings were found well below the tolerances.

Request your expert suggestions to find the Root Cause and rectify the same...

Dear Mr.deepakverma

you have inspected the Tripper Pulleys but what about the tail portion of Traveling tripper.

Have you checked the Level difference between structure where the last idler frame is seated(i.e. where the belt is starts to pass over the tripper).

weather have you has self aligning Idlers at tripper end portion.

■

At the least he may have a stretched portion of belt,

or at most a totally bad tripper belt that has to be changed.

If the tail end is bad the entire belt would be ripped on one

side from scuffing or the splices(if mechanical) would show

evidence of failure/splice separation breaking. ■

I really suspect that your troughing idlers are not level and/or square with the belt line. At no load or light load the belt may be predominantly in suspension from the uplift tangent point to the discharge pulley so that the mis-training is not effective. At the higher rates the increased contact may result in the mis-training forces.

Joe Dos Santos ■

As Roland suggests:

Loading the belt up to the tripper concave curve at higher tonnages (>700 t/h) equates to higher belt tension leading into the concave radius ahead of the tripper. Higher tonnage = higher tension = lift-off @ concave curve or resulting in larger empty curve radius prior to loading this region.

If this scenario is not the case you observe, please clarify your method with point by point loading and resulting behavior. ■