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Monitoring of Potato Flow Rate on Belt

10/31/2016 7:06 AM

i need to monitor the flow rate of Potato on an already installed conveyor belt. i am using below mention Siemens Equipment. will this work.? please note the belt is inclined about 30 to 35 degree.

7MH7126-1BB5-Z C11 (Load Cell Roller type)

7MH77241BC (Calibration Weight for roler)

7MH7131-1BA10 (Speed Sensor)

7MH7152-2AB00-2AA (integrator)

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#1

Re: Monitoring of Potato Flow rate on Belt.

10/31/2016 8:40 AM

count me in

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#2

Re: Monitoring of Potato Flow rate on Belt.

10/31/2016 9:05 AM

You may need to check the direction of movement of the load cell, and possibly make a trig correction for the slope. Then verify by running a known load of potatoes through.

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#7
In reply to #2

Re: Monitoring of Potato Flow rate on Belt.

11/02/2016 2:44 AM

Thanks Tornado. ! that means it can work with little precautions.

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#3

Re: Monitoring of Potato Flow rate on Belt.

10/31/2016 9:20 AM

What unit of measurement is it you are after?

Potatoes per minute? Kg per sec?

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#8
In reply to #3

Re: Monitoring of Potato Flow rate on Belt.

11/02/2016 2:44 AM

its tons per Hour (t/H)

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#4

Re: Monitoring of Potato Flow rate on Belt.

10/31/2016 9:21 AM

If you're already using it, how come you don't know whether or not it works?

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#9
In reply to #4

Re: Monitoring of Potato Flow rate on Belt.

11/02/2016 2:45 AM

I have just selected the instruments need to know will it work before go for ordering.

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#5

Re: Monitoring of Potato Flow Rate on Belt.

11/01/2016 8:49 AM

If installed, wired and powered, the integrator will give a flow rate reading.

That reading might be valid or invalid (such as when belt tension so high the belt lifts off the weigh roller) or close to stated accuracy or far from stated accuracy, depending on its installation.

There is a multitude of factors to consider when applying a belt scale; far too many to play 20 questions on a forum.

Siemens publishes an engineering guide for belt scale retrofits. Why not have a read?

https://w3.siemens.com/mcms/sensor-systems/SiteCollectionDocuments/wt/application_guides/Belt_Scale_Application_Guidelines.pdf

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#10
In reply to #5

Re: Monitoring of Potato Flow Rate on Belt.

11/02/2016 2:47 AM

Thanks Iris.

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#6

Re: Monitoring of Potato Flow Rate on Belt.

11/01/2016 9:25 AM

Mashed or Baked? Butter or sour cream?

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#11

Re: Monitoring of Potato Flow Rate on Belt.

11/05/2016 10:30 PM

You will need to ensure that the potatoes won't roll while the belt moves, or else potato speed will not equal belt speed, and you will "over-count" potatoes.

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#12

Re: Monitoring of Potato Flow Rate on Belt.

11/06/2016 1:30 PM

That's what the application engineering guide describes as material roll back:

Material Roll Back

Material roll back (sometimes referred to as material slip) occurs on a conveyor belt when the material, due to its size and shape, rolls back on itself even though the general direction is forward. It may be the result of any of the following:
- a conveyor with a steep incline,
- an inequality between material feed velocity and belt speed,
- poorly selected or installed rubber or chain curtains at the infeed (in this situation, the curtain is momentarily holding back the material on the top of the pile, causing it to slow down in comparison to the rest of the pile)

Generally conveyors at an incline of 15 degrees or less are ok; any more than that and material roll back can affect accuracy of the scale. Inclines of more than 30 degrees are not recommended for belt scales.

Recommendation

Make a close inspection of the installation to determine if the proper speed-to-feed, and incline versus material roll back relationships are in use.

Page 8, Belt Scale Application Guidelines 2015 Siemens Level and Weighing

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Users who posted comments:

Anonymous Poster (1); Carl_E (1); Crabtree (1); EngineerLEO (4); IdeaSmith (1); Iris (1); JustCurious (1); tonykuphaldt (1); Tornado (1)

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