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Anonymous Poster #1

Screw Conveyor Advice Required

08/16/2016 9:50 PM

There are two outlets on the trough; one has a sliding valve which is used to close the first outlet to direct the products to the second outlet. However the sliding valve can not be connected right to the top as it is going on a downward and a angle, therefore, the material will start to build up on top of the closed valve as the valve is away from the top.

Does anyone have any ideas regarding how to cover up the gap when the valve is closed and when the valve is open the product can go through without any struggle

I have thought about putting a sliding plate over it that can be opened and closed. However the tracks required for that might be a problem as the material/product can also get caught and cause a build up.

Any solutions would be amazing :)

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#1

Re: Screw Conveyor Advice Required

08/16/2016 10:16 PM

Can you take a picture? You could then post it here so we can see what you're talking about. I'm having a hard time picturing the scenario.

Get the picture onto your computer and then while you are in the CR4 posting editor:

and it will bring up a window that will prompt you through the process.

I'm sure we can come up with something!

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#3
In reply to #1

Re: Screw Conveyor Advice Required

08/16/2016 11:30 PM

Here is the image, Hope this helps.

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#2

Re: Screw Conveyor Advice Required

08/16/2016 10:33 PM

Some possible ideas:

1) If possible, the slide valve should open by moving down-slope.
2) It should retract fully beyond the edge of the trough opening.
3) When closing, it should move faster than the product speed.

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#4
In reply to #2

Re: Screw Conveyor Advice Required

08/16/2016 11:32 PM

I have put an image up of the actual Trough. What i mean is there is gap in the outlet as the valve cant fit right on the bottom. therefore creating a gab between the trough body and where the valve plate closes

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#5
In reply to #4

Re: Screw Conveyor Advice Required

08/17/2016 12:26 AM

Maybe it's just poor resolution, but I can't see any valve mechanism details in these drawings.

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#10
In reply to #4

Re: Screw Conveyor Advice Required

08/18/2016 1:54 PM

(This appears to be same drawing sent earlier)?

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#6

Re: Screw Conveyor Advice Required

08/17/2016 5:22 AM

Run with valve 1 closed to begin with and fill second trough first. When reaches "nearly full", open valve 1.

The residue in the conveyor beyond trough 1 will continue into trough 2, the small portion in the slide cover at trough 1 will then fall away and allow trough 1 to fill. Stop inlet when trough 1 almost full and allow conveyor to purge into trough 1.

End state is that conveyor and all slides are empty. No retained material to ferment or contaminate next delivery.

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#7

Re: Screw Conveyor Advice Required

08/17/2016 1:44 PM

Needs photographs documenting what you are referring to.

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#8

Re: Screw Conveyor Advice Required

08/18/2016 1:38 AM

Sounds like you need wye diverter valve something like this

Our sponsor IEEE Global Spec has several suppliers listed under the product and suppliers tab. Click here for more info.

Here's another company The solution is out there, you just need to do some research for what will work for you

I'm glad I'm not the only one that can't see his drawings

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#9

Re: Screw Conveyor Advice Required

08/18/2016 12:53 PM

Having used these in chip conveyor and ash conveyors in waste fired boilers, the mechanism you are looking for is a drop out hatch that matches the curvature of the bottom of the trough. You hinge the hatch on the upstream side of the conveyor next to the opening. The hinged hatch can be placed in a housing if dust containment is needed.

When open, the conveyor sees an open hole in the bottom of the trough. When closed, the conveyor sees a smooth curved section, just like the rest of the trough.

For wood chips and such, the conveyor was a steel shell with UHMW liner screwed to the steel shell. The hatch consisted of a steel section actually cut from the conveyor shell with the same UHMW screwed to the hatch face and then a swing arm and hinge welded onto the hatch steel. The swing arm was hinged on lugs welded to the conveyor steel shell and then the operator. We used an air cylinder.

For ash conveyors, the steel shell had an A2 prehardened liner bent and attached to the conveyor shell. Otherwise the conveyors were the same.

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#11

Re: Screw Conveyor Advice Required

08/18/2016 3:46 PM

To use a standard valve, so the owners can replace it easily, and to avoid relocating the conveyor higher so that slope specs can be maintained (assume that is why the difficult trough connection); perhaps a vibrator or rapper mounted to the exposed lateral pipe just above the valve, to assist in clearing the dead space when the valve opens.

Automation could have it run for a time at valve opening.

There is a version of a 3" DN80 knife gate valve called instrument isolation knife gate valve that allows very close coupling, through bolt flange bolting into blind holes make a very close coupling, eliminating the machine side flange bolting clearance.

http://www.orbinox.com/kp-transmitter-isolation-3938 for instance

A rod-out port also would be helpful, at both valves. Always seem to be adding these things after installation, not easy to do and much messier.

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