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Tool Talk Discussion Forum

Hydraulic Crusher

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Can Crusher

05-16-2008 22:20:44




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Had one of those air powered oil filter and can crushers but sold it as didn't need it then. Now I need one again so can I use a hydraulic cylinder to make one with and power it with air or do I need a special cylinder for air only? If I had a hydraulic pump would build one that way.




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NCWayne

05-17-2008 18:36:47




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 Re: Hydraulic Crusher in reply to Can Crusher, 05-16-2008 22:20:44  
In anwser to your question you can use a hydraulic cylinder but why not get a cylinder designed for air that's also easy and cheap to reseal (one bolt to remove the clamp, and simply replace the diaphragm. Another plus is they already have a spring return so no double acting valve is needed to reset after each can is crushed. Find a truck salvage yard and get a service brake cylinder off truck. These are the single cylinders for the front brakes, not the rear ones with the parking brake spring inside. Alot of them will have a short stroke, so it may or may not be enough to completely crush the can in a straight push depending on the cylinder type, but you could connect it to one side of a lever to increase not only the output but also the stroke. Even a smaller one will have all the power you'll ever need to crush a can, and going through a lever you could go really small. We custom built two rivet presses for relining brake bands on the older cranes we work on using brake chambers. We used a 6 inch on one and an 8 inch on another for the larger 3/16 and 1/4 rivets. In a straight push they both will set the rivets using shop air at 125psi with no problems.

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hay

05-17-2008 04:58:54




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 Re: Hydraulic Crusher in reply to Can Crusher, 05-16-2008 22:20:44  
appling air pressure will make a hydraulic cylinder rod come out so it would probably work. the one that i put pressure to shot out of the cylinder and ended up several feet away on the shop floor. need about 80-90 lb of air pressure. this was on a steering cylinder on a tractor.



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gun guru

05-17-2008 04:03:20




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 Re: Hydraulic Crusher in reply to Can Crusher, 05-16-2008 22:20:44  
Depending on the Bore diameter of the cylinder air should move the piston. If the Bore diam. is 2" or more then once the piston breaks the static friction of the seal then the piston will move. To figure out the force applied at the piston end of the cylinder take the piston diam. Say 2" and then figure the area of the piston, which would be 3.14) then X the air pressure say 80psi, which would be about 240 lbs of force.

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Can Crusher

05-17-2008 08:32:28




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 Re: Hydraulic Crusher in reply to gun guru, 05-17-2008 04:03:20  
Thanks that will help me decide what size cylinder to use. Just never had a air cylinder apart so wasn't sure if seals or piston was any different or not. The other crusher I had sold used springs to pull the cylinder back in when air was released with a muffler on one side of cylinder but it was all enclosed in a HD plate steel box so couldn't never really see cylinder inside it. It had a drain box for oil coming out of filters too.

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