Re: Minimum Distance To Install 0.25% Belt Scale
There are no strict rules. This is a combination of many factors. There are 2-idler-scales on the market which can offer accuracy of +/-0,25%. But if material don't settle down on the belt at least 2-3 idlers before the scale they won't do. Bear in mind that short conveyors and large through angles are also not a good idea as belts usually have no space to settle well on idlers.
But first tell us more about construction of the conveyor, density of material and flow.
best regards
Piotr Przedpelski
www.interprocess.pl ■
Merrick Reply To Belt Scale Accuracy
This is a very good question and, as someone already pointed out, there are many factors to be considered to ensure a correct and accurate belt scale installation.
Merrick Industries has delivered thousands of belt scales world-wide for over 100 years. We can provide specific engineering-based answers to your conveyor distance question if you can send some of the basic process details. If you can let me know the min and max feedrate (tonnes/hour for example), belt width, idler centerline spacing and proposed belt speed, I can send you a preliminary evaluation of the conveyor in reference to a belt scale installation.
A final evaluation involves a little more detail such as inlet location, idler trough angle, more information on belt length and a few other misc items. We have a data sheet if you would like to see the full evaluation criteria.
Merrick also offers a PDF of a paper written in conjunction with our NTEP Certification that has excellent information for anyone considering installing a relative high accuracy scale. I would be glad to send you a link to that document.
Regards,
Steve Musser
Merrick Industries, Inc.
steve@merrick-inc.com ■
Belt Scale
Originally Posted by mechanicaldesigner
I have horizontal belt conveyor (belt length = 13.7m.) with 4.8 m. free between skirtboard and chute.
My supplier recommended me 0.5-1% belt scale, but client wants 0.25%; I heard that conveyor need 10 meters minimun to this aplication.
Hi, I see you client is very strict. You should have a look into NIST Handbook 44, this is a Standard who can give you details and tips how to install the scale according their requirements. The exactitude of your system will depends you calibration method. I don´t know the belt conveyor lay out you have planned to do, I strongly recommend to design the way to perform calibration with material previously weighted in a calibrated truck weight meter, passing this material a couple of times you can get the aquracy of your system and then fulfill your client requirements because you are working as per recognized worldwide standard.
Many thanks.
MAL
ACFA Consultores Asociados
Chile. ■
Re: Minimum Distance To Install 0.25% Belt Scale
Hi, I see you client is very strict. You should have a look into NIST Handbook 44, this is a Standard who can give you details and tips how to install the scale according their requirements. The exactitude of your system will depends you calibration method. I don´t know the belt conveyor lay out you have planned to do, I strongly recommend to design the way to perform calibration with material previously weighted in a calibrated truck weight meter, passing this material a couple of times you can get the aquracy of your system and then fulfill your client requirements because you are working as per recognized worldwide standard.
Many thanks.
MAL
ACFA Consultores Asociados
Chile. ■
Dates Belt Conveyor
Attachment 32195Attachment 32196Attachment 32197
Thank you everyone for your answers.
Well I add now belt profile.
and more information:
4770 m.a.s.l.
Belt width=36 inch.
Speed=0.5 m/s
Density of material = 2330 Kg/m3
Flow = 112.24 t/h
Power=7.5HP
Lump size: 19mm.
and to Steve Musser thank I will need a evaluation of this case, I will contact to your mail soon.
Regards ■
Recomendations
First of all, you shall consider a flat / plane area about 12 meters length. this area shall be about 6 meters from the discharging point / feeding point. If your scale / weight meter device is table design, you shall install the weight meter in the center of the table and to install also 4 units of hight quality idlers back and forward of the 3 weighting units (rollers with weighting device inside). All this devices must be on the weighting table, back and forward of the weighting table you shall install high quality idlers and center rollers to keep the belt straight on the weight meters (both sides forward and backward of weighting table).
If your unit is modern design, it means without table, the procedure is similar, the main difference is you shall install the weighting devices and the previous 6 idlers and next 6 rollers (idlers) must be aligned with the weight meter device .
Thats all. ■
Belt Scale On Short Conveyor
We have installed several scales on Conveyors less than 10m. Only consideration sghould be the speed of the Conveyor, which should be below 1m/s. Performing Material test is a must to get the accuracy of 0.25%
We can Supply & install the system & assure accuracy
Regards
V Sundar
Orange Weighing & Solutions Pvt Ltd
Bangalore India
+91 9483527761
sundar@orangecare.in ■
Belt Scales
Originally Posted by Sundar vanchesanWe can Supply & install the system & assure accuracy
Regards
V Sundar
Orange Weighing & Solutions Pvt Ltd
Bangalore India
+91 9483527761
sundar@orangecare.in
In bulk material handling, restricting speed to 1m/s is out of question. 0.25% accuracy is possible.
Main consideration as told earlier are
1.Material should settle down before the material enters the weighing zone.
2.There should be no roll back as in sloppy conveyor,especially materiel like pallets etc.
3.Preferable uni direction and fixed slope unlike in Stacker cum Reclaimers.
Narayanan Nalinakshan. ■
Minimum Distance to Install 0.25% Belt Scale
Someone know what is the minimun distance in Belt Conveyor where is possible to install Belt scale with 0.25% precision?
I have horizontal belt conveyor (belt length = 13.7m.) with 4.8 m. free between skirtboard and chute.
My supplier recommended me 0.5-1% belt scale, but client wants 0.25%; I heard that conveyor need 10 meters minimun to this aplication. ■