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What Power is Required by a Cement Mixing Auger?

12/16/2011 3:04 PM

Dear CR4,

I have looked on the internet, but didn't find what I was looking for. I need to know what the power (HP) requirements would be for a helical auger (Archimedes Screw) to move heavy wet material (ie. concrete) in a trough?

Is there a formula that can optimize auger diameter, and work out power requirements for varous lengths of trough?

Please watch my animation for an idea of what I'm thinking of.

Thanks,

Chris

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#1

Re: What power is required by a cement mixing auger?

12/16/2011 3:15 PM

Will this be horizontal transport only?

Concrete comes in many grades/viscosities/aggregate sizes. Worst case???

This??GENERAL CAPACITIES FOR SCREW CONVEYORS CAPACITIES

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#3
In reply to #1

Re: What power is required by a cement mixing auger?

12/16/2011 3:41 PM

Hi Lyn,

Yes, horizontal only. Aggregate/grade/viscosity will vary from dry to liquid (unmixed) as well as up to 4" rocks. so it has to be tough and durable too.

thanks for the link.

Cheers,

Chris

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#2

Re: What power is required by a cement mixing auger?

12/16/2011 3:16 PM

Chris,

Look for screw conveyors. A company like Martin Sprocket or Thomas Screw conveyor. (I don't work for either but I have used their products)

There should be a PDF that will include Engineering info.

good luck.

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#4
In reply to #2

Re: What power is required by a cement mixing auger?

12/16/2011 3:43 PM

Hi ddk,

I did poke around a bit to a few sites.. but didn't really find something that would tell me how to size a hydraulic (or other type) motor to drive it. I think ideally I would use a hydraulic (pto driven) pump and motor.. but what fluid volume do I need i need?

as I'm making a proposal/submittal to mgt.. I wanted to be able to show calculations proving the design.

Chris

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#5
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Re: What power is required by a cement mixing auger?

12/16/2011 3:53 PM

one site

Another site see Section H in their PDF catalog

Conveying up to 4" rock, probably a 12" or larger screw conveyor just to prevent jamming.

The conveyor will probably be a custom, maybe wear bars, thicker flights, etc.

It would probably be wise to start working with a sales rep and get some rough ball park figures.

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#6
In reply to #5

Re: What power is required by a cement mixing auger?

12/16/2011 4:01 PM

thank you so much. Those are both awesome... esp the first one

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#9
In reply to #5

Re: What power is required by a cement mixing auger?

12/16/2011 4:48 PM

Is your lake frozen over yet?

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#21
In reply to #9

Re: What power is required by a cement mixing auger?

12/19/2011 7:43 AM

yup. about 10 days ago. somebody is ice fishing. Not sure if it really safe enough yet.

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#16
In reply to #4

Re: What power is required by a cement mixing auger?

12/17/2011 1:01 PM

Chris,

The calculations necessary to work a horsepower or torque back to a suitable hydraulic drive are pretty straightforward. A google search should find the equations. Heres one. (this site has some cool hydraulic animations) Even better, go to a hydraulics house--there are tons in Calgary or Edmonton--and tell them your torque/rpm specs and how you need to drive the pump. You will also need to know if you want the drive to be constant speed or variable--it can be a big difference in cost.

If this is a stationary application hydraulic may not be the best way to go--an electric gearmotor drive attached to the shaft is a lot simpler for a stationary application.

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#20
In reply to #16

Re: What power is required by a cement mixing auger?

12/18/2011 12:49 PM

Thanks,

I don't think I need variable speed. I think that hydrualic drive is probably my first best option.

Chris

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#7

Re: What Power is Required by a Cement Mixing Auger?

12/16/2011 4:16 PM

Drop Garthh a PM, he did quite a lot of investigation into a mixer a lot like that for Haiti

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#8
In reply to #7

Re: What Power is Required by a Cement Mixing Auger?

12/16/2011 4:25 PM

I was thinking that too, when I found this the other day... I was wondering if it was the result of his efforts.

cheers

Chris

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#10
In reply to #8

Re: What Power is Required by a Cement Mixing Auger?

12/16/2011 5:21 PM

I had kicked around a few ideas with the guys at cement trust

they are using mostly stuff off the shelf from cart-away [batch plants]

the unit you see from cement trust has a 12 hp 400cc honda engine & 10 gallons of hydraulic oil to make 1/2 meter batches

this solution is cheaper than an add on PTO unit, which start at $2k, though I'm sure something could be fabbed up for less depending on what components are available

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#11

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 9:08 AM

Years ago, I built a dynamometer to measure the power required to transport asphalt based paving material by such a screw for road paving machines. Manufacturers of these machines have formulae that work pretty well. I suggest you contact them. Hydraulic motors are the most common drive in the paving equipment industry.

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#18
In reply to #11

Re: What Power is Required by a Cement Mixing Auger?

12/18/2011 12:44 PM

Thank you.

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#12

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 10:58 AM

Hi chris.. I remember using something like you animation to pump wet mortar, we had a 15HP 3ph 60Hz motor with a variable gear box, the auger RPM was about 15 - 20 RPM. It does depend on how fast you want to move/pump your mix and we moved a lot of mix.

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#13
In reply to #12

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 11:02 AM

was the variable a reeves drive?

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#14
In reply to #13

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 11:05 AM

something similar....

but made in the UK... :)

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#15
In reply to #14

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 11:24 AM

sure

What would you call it in Britland?

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#17
In reply to #15

Re: What Power is Required by a Cement Mixing Auger?

12/17/2011 1:34 PM

as John Wayne would have said.... "Well hell yes!!" :))

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#19
In reply to #12

Re: What Power is Required by a Cement Mixing Auger?

12/18/2011 12:46 PM

thank you. I'm not sure yet about variable speed... but I probably don't have a requirement for that.

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