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Screw feeder design

Screw feeder design

Screw feeder design


I was wondering if anyone could help me with the design of a screw feeder.  Basically, I am looking to feed glass batch at a certain rate and thought that a little screw feeder would do the trick.  The screw itself does not have to be long, all it is there for is to define the rate of feeding the glass batch into the furnace (continuous feeding).

What I have found is that there are a lot of screw conveyors designs that I can take their equations and spec the size of screw, the pitch and the required horsepower. But the difference between a feeder and a conveyor is that the screw in the feeder is 100% full whereas the conveyor, if following the proper design requirements for glass batch will only be 15% full.  So, there is obviously a power requirement difference.  

Can anyone point me to a source of how to calculate the size and motor power requirements to make this screw feeder an engineered product?  it would be greatly appreciated.



RE: Screw feeder design

Hi Jeff,

You could look at a spiraflow, They are like a small screw feeder but very good for measured batch or continuous feed.
Sorry I can't find a telephone number, I hope this is of some help.



RE: Screw feeder design


 try acrison corp. they have web site, i used there equipment and they have a excellent technical service

 best of luck     mechtec

RE: Screw feeder design


You are right, feeders will require a significantly higher torque than conveyors.  This is due to both how full the feeder is (80 -90%) and the material loading from the hopper outlet above.  It is not uncommon for feeder drives sized based on conveyor calculations to have drive components fail on start up, or simply stall.

Calculating the running and starting torques must be based on the properties of the material you are handling, the geometry of the hopper above the feeder, and the design of the auger.  

Feel free to contact me if you wish to discuss this further.


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