jaw rock crusher

I decided to make a jaw crusher to process some construction debris I had laying around. I began the project with the idea that it would be mobile. I started with an old boat trailer and started building accordingly. I used pillow blocks and 2 bolt flanges to support the 1.5" driveshaft. The jaw has 3/4" swing at the top and about 1/2" an inch at the bottom. It uses a 5 hp briggs engine for power, a trailer tire and rim for a flywheel, and a yamaha blaster chain drive hub with the sprocket removed.

Category:

Science & Technology

Tags:

• jaw
• rock
• crusher
• debris
• recycling
• construction

[tbndeereman75]

how is the moving jaw attached on the bottom. I am wanting to build one, just cant seem to find how to do that anywhere.

[mrsicivicdude]

@tbndeereman75 There are three different methods to do this, a single "toggle", a dual "toggle", or the SUPER simple way I did it.

I used an incline plane at the bottom of the movable jaw and a large diameter rod attached to the frame. The eccentric cam moves the movable jaw forward, down, backward, and then upward. Forward and backward crush material at the top, up and down move the bottom of the jaw in and out to clear the mechanism.

[tbndeereman75]

@mrsicivicdude So the incline plane is on the bottom of the jaw, and the rod is on the frame, right? So when the jaw moves, the back slides on the rod, and that is how the jaw mounts? Is that right?

[mrsicivicdude]

@tbndeereman75 That's absolutely right. The inclined plane slides against the rod freely (not attached) and only gravity and the pressure from the rocks holds it back. Its alignment is dependent on the pillow block at the top "holding it" up just right. I built the movable jaw and inclined plane and then set the rod in place.  I then shimmed the non-moving jaw to adjust the output diameter.

[m46nepa]

i'd love to see more vids of this showing the internals and the crank construction. how did you build the eccentric onto the crank? why didnt you use a straight jaw in the back? it seems to be angled. what are the throat dimensions?

thanks, i'm planning to build one and you have given me great ideas.

[mrsicivicdude]

The eccentric is 2 1/4" welded directly onto the 1 1/2" shaft. I started with a piece of 2 1/4" OD pipe and tacked it onto the shaft and then filled the pipe solid using a torch and filler rod so the eccectric is solid metal.

Both jaws are straight. The moving jaw is a total of 14" long including what was needed to bolt the pillow mount to the back of. ~4" is above the "backsplash" hidden from view.

[tbndeereman75]

@mrsicivicdude ok, great thanks

[davetileguy]

I understand how u made the eccentric (lobe) but how does it attach to the shaft? I thought about using a cam that would contact on the upper back of the crush plate ,but from what I understand the bottom pinchpoint must go up and down or it will clog.

[davetileguy]

I love it!! I'v been searching for something like this ,simple and homemade,any pics you could post would be great!! did you use hardened steel for the jaws?

[quadracer1243]

luv it bro.... its 04blasterboy for BF, hehe