Inclined Screw Conveyor

Just make the central shaft stiffer.

I'm not a screw conveyor guy, but 115mm ID (about 4-1/2") and 12 meter (about 39 feet) long and no intermediate supports for the shaft?

Can hangers be used in 4-1/2" pipe at all?

The outer edge can be capped with a U section of UHMW-PE, which rides on the surrounding tube. This supports the screw throughout its length.

One thing about screw conveyors is that when full, it self centers. . I don't think Martin gear has it, but they do have written information on this I'm sure.

I do t recall where I used this, but there were some good design checks on the web from suppliers. I don't think Martin gear has it, google it. but they do have written information on this I'm sure.

Also you'll have to put in information such as product properties, production rate, ect...

I've worked on screw conveyors at a cement pant that sends cement from the plant to the barge through screw conveyors that are 6 miles in length to the barge.

Rarely is there any bearings, the shafts are coupled and run from a huge (we referred to this as a (Super big ass motor freakin motor) The shaft of the drive motor was 12". This screw conveyor send millions of pounds of cement dust to the barge daily to China. By the way, this motor operates on 33KV 3Ph. When they start this up, they call the power company to get ready for the inrush even though it is on a VFD. The motor is the size of a house. But it has a lot of work to do, the screw conveyor is 2 feet in diameter. This was one of the systems where a guy opened the knife switch and created an arc flash while it was under load. The whole MCC section exploded. He almost died, but being as burned as he was, I thought to myself, I think I'd rather have died. This was many years ago.

He suffered so much. And it was seconds for the AF. Since then I respect electricity a whole lot more. I no longer change things live. I think I am 1 shock from death as it is. Been hit with everything the power companies have to offer.

It is just the nature of the beast. Play with what ever you will get burned.

Today I deal with DC up to 144VDC and covert this to 3Ph AC motors at present but moving towards 416VDC with traction motors for the marine industry.

I am a bit confused by your dimensioning...you state that the ID of the screw conveyor tube is 115mm but say that the flight height is 80mm. 2 x 80mm is 160mm OD (and this is without the center shaft) so how can this fit into your tube?

We have done several inclined conveyor applications with long spans (much larger diameter) but shaft deflection is the killer. We have used thicker flights in the middle of the span and let the screw ride on a wear plate that was installed in the bottom of the conveyor tube. I wouldn't recommend to use plastic for the wear strips as they will not last very long but if the material you are conveying is quite "soft" then you may be able to get away with it.

Good luck!

So am I. More detail needed!

I would have thought that "flight height" referred to the pitch of the flights, ie rise of the spiral in one full revolution. I am not aware that has any bearing on the screw diameter.

I think the 115 mm is the OD of the shaft (and the ID of the flights), making the ID of the tube somewhat greater than 275 mm. (Guessing.)

yes,you are right....ID of flight=OD of shaft=115 mm,flight height=80 mm...material to be transported = clay powder..Length of conveyor =12 mtrs ,inclination 30 degree...

I don't get that from the OP...still would like to have more information ( a sketch would be really nice!).

All of the screw conveyors that I have ever dealt with (and I have been working with them for 25 years), flight height is defined as the distance from the outside of the center shaft to the outside radius of the conveying flight. The pitch is the axial spacing of the flights...

You don't say what you are moving, but have you considered a shaftless screw conveyor?

They generally move more product and can easily handle the length involved without intermediate support and can employ a liner of UHMW to reduce noise and wear.

I don't know where you are located, but S2S industries in Canada are at least one who do this sort of thing well.

Cheers

Use one of these and you have no choice but not to have a hanging bearing:

It is possible if the conveyed material is light and the rate is low. Additionally the motor will have to be on the discharge end to pull the material otherwise the screw will pretzel.

Following are links to two major USA manufacturers of "flexible" screw conveyors:

Flexicon http://www.flexicon.com/Bulk-Handling-Equipment-and-Systems/Flexible-Screw-Conveyors/index.html

Hapman http://www.hapman.com/equipment-systems/flexible-screw-conveyors