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Linear drive loading device
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Posted by: hope

07/17/2010, 13:47:04

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I am trying to help some DOT colleagues brainstorm ideas for a simple, relatively inexpensive, device for pushing a probe into the ground to a depth of 4ft and with a maximum thrust of 5,000 lb. They had thought of a hydraulic cylinder as a possibility, but the cylinder would need to be mounted above the top of the rod.

I was thinking that I had seen a mechanism using a threaded rod that is rotated and causes a block retained in a slot to move vertically along the rod. A motor is used to turn the rod at a constant speed, thus producing a constant linear velocity of the block.

Is it possible to buy a threaded rod, block and motor system that could produce 5000 pounds of force?

Thank you.

Sincerely,
Roy








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: Linear drive loading device
: Linear drive loading device -- hope
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Posted by: RWOLFEJR

07/20/2010, 14:47:25

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Sounds like you're on the right track Roy. If you're looking to keep this low profile a worm or screw drive would allow your system to be just a bit higher than the post you are driving... Basically higher by the height of the driving block or "nut."

With ratio adjustments on a speed reducer / torque amplifier, you should be able to tweak in whatever load you need. I'd bet you could use the hydraulics or a pto already in place on a DOT truck to drive this. Couple hoses and a hydraulic motor driving a speed reducer driving a chain and sprocket to the screw... and a big heavy DOT truck to keep it all from lifting...?

Do you mean should only take 5,000 lbs... or do not exceed 5,000 pounds when doing this? Or maybe this is some sort of pressure test for cured concrete?

Another thought... to keep this simple and inexpensive you could go with a pulley block set-up and a 5,000 lb. block of steel guided by channels or angles. That'd be about 26-5/8" cube of steel. Raise the block with whatever... load your pin... lower the block and let gravity give you your load.

Depends a lot on how quickly, how precise, and how many... of these things you're dealing with.
Good luck.
Bob








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