Need help on LIW feeder

Posted in: , on 28. Dec. 2007 - 19:46

We have a LIW screw feeder and found when manually output material with this feeder, the weight sometimes jumps up 5-6 grams instead of going down. Then it goes down 13-14 grams suddenly. Then goes up 5-6 grams then goes down 13-14 grams......

What will be the problem? Is there anything wrong with the screw? Thanks! ■

Screw Feeders
Mechanical Feeders
Feeding & Dosing
Handling
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Re: Need Help On Liw Feeder

Posted on 29. Dec. 2007 - 01:21

Problem sounds like you are getting slight vacuum in the LIW feeder. Have you got a vent on the LIW feeder hopper? If you have a vent check if it is blocked if not you should look into having one. ■

Mantoo

Re: Need Help On Liw Feeder

Posted on 1. Jan. 2008 - 06:28

For information regarding flex connector pressure problems reference my article http://www.melfitechnologies.com/pressure.htm

Is the scale a counterbalance unit? Considering the jump is repeatable there may be a binding within the scale flexures and/or dampening pot.

What is the time span of the jumps? For reliable LIW operation you may have to expand the sampling time to average out the jumps.

Regards, Delmar Schmidt

Melfi Technologies Houston

http://www.melfitechnologies.com/ ■

Re: Need Help On Liw Feeder

Posted on 2. Jan. 2008 - 03:28

Mantoo, Delmar:

Thanks for the replies. The problem does not happen quite often. Next time when it happens again, I will check it. ■