I have recently acquired some out dated medical devices, all still working perfectly fine just de-commissioned,
1/2 doz. Portable Oxygen tank equel in size to a 20Lb fire extinguisher and a few oxygen concentrators.
the concentrators have a 30 psi compressor. other normaly closed 12V valves, relays, etc.
My 1st. theory "replace vale with Normally closed electronic valve, with quick disconnect hose, attach to crevice tool in place of using hand pump action and install trigger for electronic valve. only concern the rapid depletion of the vacuum from the tank, how quick would that be.
2nd. theory, fill with water, pressurize and and build a mini dredge nozzle
Each tank weighes 9 lbs each, all aluminum, about 26 inches tall 4.25 inches in diam. with a 200 psi ratting.
Any one else have any suggestions as to a new use of these tanks, would they float if pressurized to say 150 175lbs? I've not tested it yet.
Replies
the PDF is now available at Power SNipper/ non Mecanical Hand Dredge this is a direct download link.
http://f1.grp.yahoofs.com/v1/sA8tT9YSUW1Ed1hKeWmkMUFNSMJstMZrAySw6r...
it is in the same folder as the DWG file if you wish to down load it there.
These links dont seem to work.
try this one http://groups.yahoo.com/group/Goldminers/files/TDWay47?prop=eupdate
is in the same folder as the DWG File disscused earlyer.
this link taks you to the files on Gold Miners group on Yahoo.
It may not allow you access if you are not a member of the group.
Interesting, your idea using pressurized air tanks gives me another idea on how to make my credit sucker-upperer work. Also none of your links work on my Kindle fire. Need a PDF file.
Well if you were to cut the top off of one of them tanks , You could dig a hole, and put a hard rock at the bottem then put the tank in the ground and you now have a hill billy Rock Crusher
May Be, but we are talking aluminum Tanks, not steel, not sure if they would hold up the the pounding for long?
Interesting concept. Tank and small 12V compressor.
If you could set up a trigger. That gives a pulse of suction, with an electronic valve,as you are talking... Like a big bass opening its mouth, or a hand pump dredge. A short blast of pressure could power a piston and give you a blast of suction. Then you would have to set up a trap like a hand dredge does. One problem is the mechanics of air to push water. Its not a crankshaft that piston #2 pushes piston #1 back into place. You would have to manually do it... And the hand dredge is a manual pulling sucking motion. 100% efficient in that the harder you pull the piston, the faster the water goes,and the better the suction... In your plan you are using the regular dredge physics. In that it pushes enough water through the hose so fast, it forms a vacuum at the nozzle tip... Your device might not have enough volume of water moved to get an efficient vacuum...
I'm on the same mission this winter. I bought a 2 stroke 20cc gas powered pump. It only weighs 14 pounds and pushes 1740GPH. It will power a 1" dredge. And along with hoses, and my mini sluice/highbanker I plan to buy. The whole unit will be able to be carried in 1 backpack by 1 person...I started a blog about it a month ago. But havnt got the suction hose to test it yet...
Anyways. Your tank/12v compressor idea has some real potential for a pulse suction device, that ISNT CONSIDERED A DREDGE! That distinction alone could be very valuable to California prospectors trying to get that gold off the bedrock...
Anyways. keep us posted.
I'll be uploading my the Concept drawings in PDF format this morning,
I have opted to for go the extra weight of a batteries and electronic valves etc. to just using a common air gun "shop tool" as the trigger. The top end is open to allow for free air/water flow with a #100 or #200 mesh screen 1/2 to 3/4 the way up the "Vacuum Tube" where the pump would normally be on a hand dredge.
If I'm correct the Tanks that I will be using has a 300+ PSI ratting, their is no "mechanical pump", with exception of the compressor used to charge the tank once it is filled with water, inside the tank I will use a weighted flex tub that extends to the bottom.
Terrance, as I am understanding it, you are wanting to create a very small air charged system similar to what commercial salvage companies would use to bring up sand and artifacts from the ocean floor...is this correct? Instead of water pressure, you are wanting to use air pressure to cause the venturi effect in your suction nossle. And you were mentioning something about filling with water and pressurizing it. Do you mean, filling the canisters with water and pressurizing them? That wont work...You can not pressurize water, only the air space in the canister. The liquid can not be condensed. If you have a space within the canister inwhich a gas (air) can be condensed (pressurized) then that pressure would force the water to exit the canister at a higher velocity. Sorry, its just physics!
I would think , the idea of using the air might be fessible but only if the tube it is being shot into is in an extreme vetical angle. The water and debris is sucked up into the opening of the tube by means of the water displacement within the tube. The amount of air must displace a larger amount of space than the water in order to create a suction. Suction is caused by the rate of the air rising within the tube. I don't know how long one of your 20lb. canisters will last being in a constant rate of high velocity flow. They will run out of gas quick and you will lose suction way too often for this to be a reliable "dredge".
Sorry this has been so long winded, I just wanted to be clear on my explanation. If you are questioning me...Please prove me wrong . Create one that works good, Start making these "crevise dredges" and I'll be the first to buy one!
I suppose the ideas presented weir a bit abstract in description, I'll try to to draw out a pictorial description and post back end of the week.
One thing I have determined, due to there displacement they would be of no value as a floating platform they are too heavy even charged.
Thanks, I'll be back
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