Crushing concrete
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Egon
Epic Contributor
What have you got for rock breaking tools?
OP
6sunset6
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me the OP I have a small rotary/ hammer and 2 log splitters . I would really like to find a small jaw crusher. Use it and sell it. or rent a small trailer mounted one . I looked at United Rental Thy have nothing.
Egon
Epic Contributor
Okay, lots of slow heavy work to accomplish the job.
Consider a weight dropping and being lifted by a slip rope on drum.
Consider a weight dropping and being lifted by a slip rope on drum.
OP
6sunset6
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While I am waiting for anyone to respond to my request to place 12 cy I have been looking at the pile of concrete . What I would really like to do is rent a small crusher on trailer for a day. But the only place that seems to be into that is the UK. I also found an interesting crusher made in the UK Attached picture.
Unfortunatly it is a.gif file and gets fuzzy when blown up
. There is a movie of that running as well on their web site Concrete Crushers.
So I started thinking. I have a 12' Bucket from a MF TBL good size. If I bolted it to a skid steer plate ( 5/16 plate model already on order) and inserted a crusher base plate and crusher plate inside the bucket and used the upper pin holes in the bucket to anchor a cylinder I could sit in the seat and crush away.
I have a 3.5 " cylinder but it's too long . What I really want is a 4" with a 6" stroke. I have front hydraulics for a grapple on my bucket and the tractor has 7gpm. Thats plenty. Cycle time on the cylinder is plenty fast probably too fast 1/4" hoses would be good. I guess I should go take some pictures . Be right back
ok pictures pile of concrete waiting to be crushed, MF 12' bucket and the poor mans cad works for crushing jaws.
. It not a real big jaw opening but I think it will work.
I don't want to alter the bucket so it cannot be used on the MF so everything will probably bolt on and there will just be some bolt holes in the bucket. I have enough steel around to cobble up something , The skid plate ,same bolt up so the only big ticket item is the cylinder. Found one for $230 4 x 6 3500 psi . .
Unfortunatly it is a.gif file and gets fuzzy when blown up
. There is a movie of that running as well on their web site Concrete Crushers. So I started thinking. I have a 12' Bucket from a MF TBL good size. If I bolted it to a skid steer plate ( 5/16 plate model already on order) and inserted a crusher base plate and crusher plate inside the bucket and used the upper pin holes in the bucket to anchor a cylinder I could sit in the seat and crush away.
I have a 3.5 " cylinder but it's too long . What I really want is a 4" with a 6" stroke. I have front hydraulics for a grapple on my bucket and the tractor has 7gpm. Thats plenty. Cycle time on the cylinder is plenty fast probably too fast 1/4" hoses would be good. I guess I should go take some pictures . Be right back
ok pictures pile of concrete waiting to be crushed, MF 12' bucket and the poor mans cad works for crushing jaws.
. It not a real big jaw opening but I think it will work.I don't want to alter the bucket so it cannot be used on the MF so everything will probably bolt on and there will just be some bolt holes in the bucket. I have enough steel around to cobble up something , The skid plate ,same bolt up so the only big ticket item is the cylinder. Found one for $230 4 x 6 3500 psi . .
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6sunset6
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Upon further contemplation I decided the jaw opening was not big enough so more stroke on the cylinder. I have a 3.5 " diameter with a 10 inch stroke . Thats 24000 pounds at 2500 psi. Might work. If not I will build it so I can put in a 4 or 5 inch cylinder with not a lot of work, just pins . but the upper pin holes in the bucket are too close so I have to add some plates to move the upper cylinder anchor out . one of the problems with fooling around with stuff like this is the forces. A 5" cylinder is just about 50000 # of force. It is not easy for me to calculate buckling forces on webs, I usually just over build . In this case weight is not an issue.
zing
Platinum Member
Instead of fabricating jaws to crush the concrete, could you just put the bucket on some flat steel and "rock it" back and forth over the concrete chunks to crush them? If it is not heavy enough you could fill it with rocks and increase the weight. Maybe a connecting rod to your log splitter would be enough to rock it back and forth.
chim
Elite Member
When I was a kid I worked in a quarry near here that provides crushed stone. they had two types of crushers. The main crusher took material that ranged from dust through refrigerator-sized rocks straight from the quarry pit and reduced it to stuff that would all pass through a screen of about 5" or so. Before getting to the main crusher jaws, some of the material that would pass through a 3/4" screen went to the 2A Modified bin so the fines and dirt produced a material that compacted well for certain applications.
The main crusher had massive jaws. One was stationary and the other moved in an orbital manner. When the moveable jaw approached the stationary jaw, it had some (down) horizontal movement so it chewed the rocks as it crushed them. As the moveable jaw came away from the stationary jaw, it also moved upward. A series of different sized screens would sift and sort the crushed stone and drop it into bins. The plant was set up to collect from dust to 5" ballast in bins. They always ran either 4" OR 5", but not both at the same time.
The 4" or 5" that wasn't being collected was redirected to the small crusher. This crusher operated differently. It consisted of what looked like a big heavy steel drum with lobes on it in an enclosure that had a thick steel "roof". Viewed from the right side, the fast-rotating drum turned clockwise. A conveyor fed the stone from the right and into the lobes on the drum. The drum impacted the incoming stone and blasted it against the roof. Every few months the thick steel roof had to be replaced. I think the steel roof was about 2" thick and would wear completely through in the center.
The main crusher had massive jaws. One was stationary and the other moved in an orbital manner. When the moveable jaw approached the stationary jaw, it had some (down) horizontal movement so it chewed the rocks as it crushed them. As the moveable jaw came away from the stationary jaw, it also moved upward. A series of different sized screens would sift and sort the crushed stone and drop it into bins. The plant was set up to collect from dust to 5" ballast in bins. They always ran either 4" OR 5", but not both at the same time.
The 4" or 5" that wasn't being collected was redirected to the small crusher. This crusher operated differently. It consisted of what looked like a big heavy steel drum with lobes on it in an enclosure that had a thick steel "roof". Viewed from the right side, the fast-rotating drum turned clockwise. A conveyor fed the stone from the right and into the lobes on the drum. The drum impacted the incoming stone and blasted it against the roof. Every few months the thick steel roof had to be replaced. I think the steel roof was about 2" thick and would wear completely through in the center.
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6sunset6
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Step 2 of the poor mans cad program. A wood model. It's not that I don't have a cad program, I do . But I never use it enough to become proficient at it or to remember the commands 6 months from now. I keep thinking I will learn one in the winter but somehow that never happens. Oh well I have a lot of wood scrap around , a good table saw, a good cut off saw and a planner. So in 6-8 hour the crusher insert has appeared. 
How come my pictures are so big? Next I have to model the cylinder I have a 3.5 diameter I am going to try. But design for a 5" If I need bigger. If I get some hoses and a couple of fittings I could run the model under hydraulic power. If I had planned ahead I could have run it on air but I tested the cylinder and now its full of oil. Now that I think about it it originally had ATF in it and I run the New holland stuff. I guess its flush time . What a pain through 1/4 mpt.
How come my pictures are so big? Next I have to model the cylinder I have a 3.5 diameter I am going to try. But design for a 5" If I need bigger. If I get some hoses and a couple of fittings I could run the model under hydraulic power. If I had planned ahead I could have run it on air but I tested the cylinder and now its full of oil. Now that I think about it it originally had ATF in it and I run the New holland stuff. I guess its flush time . What a pain through 1/4 mpt.