GEK Wiki / Jay Martin: Bridging Fix
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Jay Martin: Bridging Fix

Page history last edited by Jay Martin 14 years, 11 months ago

I took a week or two off to think more about bridging and came up with a solution that uses a small rotissiere motor I had from a gas grill. My first concern was how to mount a shaft in the reactor chamber. I felt that it needed to have a central anchor to keep it from wandering as the shaft turned. I wanted to minimize restrictions to the chips flowing past this framework. The result was a tripod made out of 1/2in angle iron with the "v" points up, allowing the chips to flow around as shown below.

 

The angle iron was welded to a central hub made of some 1 in tube that extends down about 2.5 inches. I also drilled 3/16in holes underneath were the angle iron attaches. The thought here was that a void is formed as the chips flow around the angle and may create a passage to collect the volatile gases that cound then be drawn into the central tube and either injected directly into the hottest part of the combustion zone or, at a later time, an air nozzel be added to help draw the gases in and have them combusted in the hub.

 

On the top of the hub, I welded a cap to seal it off and hex nut I drilled out to 1/2 in to remove the threads. This forms the base for the stirring shaft to sit upon. This tripod is held in the reactor chamber on three pins welded into the sides of the reactor as shown below. And, yes I now realize I welded the one pin too close to being directly above the nozzle to permit easy removal. The picture below shows the tripod in place.

 

 

 

 

The next step was to make the stirring rod. I was contemplating hwo many arms to place on it and determined that one shoudl be sufficient since multiple arms would only increase the drag without providing any benefit. That shaft is made of 1/2in rod. I welded a second drilled out nut at the bottom to provide a larger surface for the shaft and tripod to be in contact to minimize drag due to binding. I left about 1/2 in of the shaft stick out to turn in the "bearing" on the tripod. To the nut I welded a 3in length of 3/16in rod. A square end was ground onto the top of the rod to fit into the stirring motor.

 

 

 

A 1/2in hole was drilled into the 1.5 in plug in the top of the reactor and the shaft was allowed to pass through. Some scrap steel was welded together to the top to attach the stirring motor and keep it from turning.

 

 

The final picture shows the motor installed in place. A piece of sheet metal, with some angle iron is slid into the back of the motor through flanges meant to hold it in place.

 

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