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Tool Talk Discussion Forum

Fill level detection sensors

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CBBC

01-26-2005 21:55:30




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I am looking for any information on capacitative sensors for opperating a soil bagger. Currently the bag fill is controlled by a timer(about 3-5 sec depending on bag volume.) This is however fairly inacurate as the volume of soil along the conveyer must be extreemly consistant for it to be accurate.

I know there are thousands of different sensors out there, I just need to narrow the field. I want it simple, durrable, and no PLC involved.

Has anyone had experience with sensors of this type fo filling bags etc? What are good brands to look at? What other things should I be looking out for? Photo or ultrasonic sensors???

Any information would be appreciated, thanks Grant.

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CBBC

02-02-2005 20:41:26




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
Thanks for all your thoughts. We do use some prox sensors to keep the bagging hopper full - similar type of sensor to keep grain bin full. I"m kind of leaning towards some sort of photo eye for the bagger , but maybe I should revist the scale. Grant



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Bill WI

01-28-2005 08:55:53




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
I found a hopper on Ebay that would show what I was talking about. The other pic on the bottom of the ad shows the switch. Don't combines have a similar switch to indicate a full bin? Anyhow it's item#3868840466. May even be able to locate a cheap switch on Ebay. They have replaceable innards.



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1945A

01-28-2005 08:03:17




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
You didn"t give a lot of details about the material you"re bagging, or the type of bags you"re using, so, it"s hard to make suggestions as to how to improve upon your operation.
There are a couple of options that come to mind. Obviously, some type of beam scale with a limit switch set-up would be the most consistent. My guess is, that although you"re filling by volume, there"s a weight range that will yield the volume you"re looking for.
Another option might be (IF you were using clear plastic bags, for example), some type of photo eye, that would "look" across the top of the material or bag, and when the product reached a certain height, or the bag dropped (from weight), the phot eye would stop the conveyor/release the bag. More detail would help in making suggestions....

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Bill WI

01-28-2005 07:29:47




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
In industry what I saw was just reversed. When hoppers got to low they'd kick in to refill the hopper with parts or molding powders. Always a paddle on an arm to trigger a little micro switch. It would just be wiring the switch on the other terminal or normally closed switch. I would unload to a hopper with the setup and dump to the bag. The hopper could be a square box with a trap door to prevent material bridgeing. Do you have a plastic molding company around? Maybe if you'd talk to them theyd let you have a look see.

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CBBC

01-27-2005 17:30:51




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
Thanks guys. Weighing is ok but as stated adjustments must be made. We fill and sell the bags by volume so we want to have the bags consistant and full.

Automation is a lot better than filling with a shovel, but the road there is a pain in the butt.
Grant



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larry in tn

01-27-2005 18:45:51




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 Re: Fill level detection sensors in reply to CBBC, 01-27-2005 17:30:51  
If you have a good source of air pressure this might work although I don't know your bagging set-up. Load the bag on a small platform that is kept elevated by a small air cylinder that is maintained at a pressure high enough to hold the platform off a limit switch until the bag is full enough to over come the pressure excerted by the cylinder which will allow the switch to activate. As I said not knowing your set-up I can't really finess the total control circuit.

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Kendall

01-27-2005 06:38:55




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
A friend owns a landscape supply company and their sand/landscape gravel/soil conveyer bag filler-upper machine cuts off the flow when the bag reaches a pre set weight. Looks like just a matter of scales connected to the conveyer drive power. Hope this helps with some ideas.



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Weirsdale George

01-27-2005 02:54:38




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 Re: Fill level detection sensors in reply to CBBC, 01-26-2005 21:55:30  
I visited a seed harvesting operation a while back and they had some sort of scale attached to their bag filler and it stopped filling when a specific weight was reached. You may have to adjust the trip weight periodically for changes in soil moisture, depending on how accurate you want to be.



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