Pneumatic Assisted Separation - Page 2 - The Combine Forum

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post #11 of 51 (permalink) Old 04-15-2016, 06:00 PM
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The old Versatile 2000's use to have a very positive rotor air feed. The trouble was this air traveled right out the ass. While it was spinning empty you could throw in a pail of wheat through the side door and it would come right out the back onto the ground.

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post #12 of 51 (permalink) Old 04-17-2016, 06:32 PM
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Originally Posted by SunnybrookW&M View Post
- modify "stop" sign (combine side panel) to have a 3/4" high ring that overlaps and insets the 24" rotor skin by 1/8". Between the bearing mount and the inner ring, open approx 50%*of the surface so air can be supplied to the cavity inside.
Not to throw cold water on your idea.....what are you doing about the stop sign flexing?

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post #13 of 51 (permalink) Old 04-27-2016, 12:48 PM
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Take your sweeps and weld them on more horizontal to the cylinder, lay them back at an angle like fan blades instead of standing them straight up and they will blow the grain out of the cage prior to the grain entering the discharge. The cage on the separator side remains very clean. Now if I can figure out how to do this on the threshing side.
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post #14 of 51 (permalink) Old 05-03-2016, 03:56 PM Thread Starter
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ehoff1: it's a consideration through the process and we will investigate this in dynamic airflo testing. Can't add too many variable at a time unfortunately.
Khigerd: Stop sign now has a ring attached to seal inside 24" rotor pipe, this will take most flex away, inside will be supported by 4 affixed 1"x1" angle iron, plate will be H-Q-T'd for durability.

complete display at Regina Show, airflo data included
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post #15 of 51 (permalink) Old 05-03-2016, 07:37 PM
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complete display at Regina Show, airflo data included
Wow, high tech, looking forward to it!

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post #16 of 51 (permalink) Old 05-04-2016, 01:37 AM Thread Starter
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Uh-oh...SNAFU on the static air flow testing, we're having some laughs already. First, excitement....7 slits across (see attached photo) and initial air velocity readings (at pressure) from concave to discharge are 1) 46 mph 2) 51 mph 3) 54 mph 4) 6 mph whaaaat ?????. Anemometer malfunction LOL. re-test and re-test and nope, no error.
slit number 5 actually has a negative air flow !! (That really SUCKS) Sunnybrook meets the Venturi effect. As air flow travels down the channel unimpeded, the higher the velocity (closer to pressure source) the greater the effect. Baffling. We need baffling to break up linear air flow apparently.

Thank Goodness we didn't just slap the thing together and go to the field, hoping for the best. It would have plugged in 5 seconds and been of zero benefit. Oh well, lets see what tomorrow brings.

On a positive note, we're becoming confident we can produce AMPLE air at low rotor RPM's.
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post #17 of 51 (permalink) Old 05-04-2016, 02:12 AM
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Need a tapered channel (change in width to disrupt air flow)

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post #18 of 51 (permalink) Old 05-04-2016, 09:02 AM
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Thinking out loud.........What about dust and debris accumulation in the channels? Could cause balance issues. How would you be able to clean out the channels? If I understand you design correctly, air enters the left side of the channel and flows to the right. There is a large dead air space at the concave end where dust and debris would accumulate.
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post #19 of 51 (permalink) Old 05-04-2016, 09:45 AM Thread Starter
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Thinking out loud.........What about dust and debris accumulation in the channels? Could cause balance issues. How would you be able to clean out the channels? If I understand you design correctly, air enters the left side of the channel and flows to the right. There is a large dead air space at the concave end where dust and debris would accumulate.
The open backside of the Rasp bar mounts is a far more likely pocket to accumulate and hold material to put the rotor out of balance. That being said, we've put a removable(or spring loaded) endcap on either end of the channel. It would be easy to use a "ramrod" to poke through and clean if needed without removing rotor. As long as the rotor is turning, air will keep any material from getting into the jets. These are August issues for us, but you are correct that we need to have a list of "anticipated possibilities" to reduce shoulder shrugging time.

That's the primary reason I've chosen to interact via this forum. A lot of VERY experienced people consulted for ZERO cost to us. We've got a year to prove concept, clock's ticking.

BTW: with the raised channel, adding longer bolts fixed the linear air flow issue. Makes you scratch your head though. Now we're wondering if the rotational speed (ie 1000 rpm) will change the dynamic of air transport. Irony : This isn't Rocket Science, it's only a Turbojet Bypass system.
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post #20 of 51 (permalink) Old 05-04-2016, 10:26 PM
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- modify the rotor stub shaft by adding 2 step-downs. 1st is a small step to accommodate the rpm dial, second step down will be to mount a high volume 22" axial fan, delivering air through the stop sign into the centrifugal fan cavity for compression.
-cut a 22" hole in the combine body panel corresponding to the axial fan and mount a safety screen
My reason for the question was because you are drawing air through the left side of the combine. The wind blows around here from time to time. If the wind is blowing up the backside of the combine, chaff from the shoe and straw from the spreader (fine cut chopper makes small pieces) can blow past the cab. This MOG will surely be drawn into your air system. I wonder if it will just be blown on out or get hung up in the channels along with the dust and may cause blockages and balance issues. Our straw can be 1 to 2 inches long off the spreader and possibly bridge across the jets.


Last edited by khigerd; 05-04-2016 at 10:35 PM.
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