1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

small grizzly gravel screen project

Discussion in 'Screen/Wash Plants' started by lake side bob, Dec 11, 2016.

  1. lake side bob

    lake side bob Well-Known Member

    Joined:
    Oct 3, 2009
    Messages:
    133
    Occupation:
    owner operator
    Location:
    minnesota
    couple of questions what do your think of this project, YOUR COMMENTS WILL BE GREATLY APPRECIATED.
    would like to build a small grizzly screen.
    planning on a deck slope of 30 degrees.
    will use electric vibrator to shake grizzly bars, like on a dump truck box but vibrator designed to operate continuous.
    thinking of the grizzly bars to use, 1 inch round solid bars with 2 or 3 inch spacing between bar edges.
    bracing under grizzly bars will be located 18 inch from top of deck then another 18 inches and another 18 inches, then one half of the rest of the distance.
    1 inch round bars can be purchased in 20 foot lengths so length of deck will be 6 feet 6 inches,that should be long enough for the sand to fall through before reaching the end of the screen deck.
    Width of deck would be 10 feet my two yard bucket wheel loader is just under 8 feet wide.
    height will be 9 feet dump clearance at full dump.
    box frame will be 3 inch square tubing 1/4 thick wall with 3/16 plate on sides.
    if I want to screen smaller material I could place a wire mesh on top of the grizzly rods.
    I expect the largest rock that would occasionally be dropped on the grizzly bars would be around 18 inches. May be a 2 foot fall at most.
    Most rocks would be 12 inches and under, any thing larger then 18 inches I would waste off to the side in the pit.
    What do you think, what would you do differently.
    Think it will work and what problems do you see?
     
  2. farmerlund

    farmerlund Well-Known Member

    Joined:
    Nov 23, 2014
    Messages:
    178
    Occupation:
    Farmer/ excavator
    Location:
    North Dakota
    I don't think the 1" round will stand up over time.

    The last one I helped a buddy build was made out of 1"X 4" flat bar stock. with 4" spacing. We made the deck 10ft long, just cut 20ft in half. no waste and gives a longer slide.

    To keep bars parallel we bored a 1" hole through all the bars in the middle and pushed a solid round bar through and welded it all together.

    Also cut 2"X2" squares out of the ends so the bars would hook onto the 4"X4" tube frame.

    Been using it for 3-4 years. no damage yet.
     
  3. lake side bob

    lake side bob Well-Known Member

    Joined:
    Oct 3, 2009
    Messages:
    133
    Occupation:
    owner operator
    Location:
    minnesota
    I have down loaded two photos of what I want to build.
    To enlarge the photos click on the CONTROL button on your key board and using the dial on your mouse rotae the mouse to increase or decrease size of image.
    What do you think referencing the above co yellow screen #1 12122016.jpg yellow screen #2 12122016.jpg TTACH] yellow screen #2 12122016.jpg mments.
     
    Last edited: Dec 13, 2016
  4. lake side bob

    lake side bob Well-Known Member

    Joined:
    Oct 3, 2009
    Messages:
    133
    Occupation:
    owner operator
    Location:
    minnesota
    A third photo yellow screen #3 12122016.jpg
     
  5. grandpa

    grandpa Senior Member

    Joined:
    Oct 16, 2009
    Messages:
    1,582
    Location:
    northern minnesota
    One question. When it gets plugged up with crap (and I've never seen one that didn't) how do you plan to clean it off?
     
  6. fast_st

    fast_st Senior Member

    Joined:
    Dec 1, 2010
    Messages:
    881
    Occupation:
    IT systems admin
    Location:
    Mass
    I'd just hook it with the bucket, tip it over then stand it back up?
     
  7. ol'stonebreaker

    ol'stonebreaker Well-Known Member

    Joined:
    Apr 26, 2015
    Messages:
    206
    Occupation:
    retired
    Location:
    Idaho
    Not trying to rain on your parade but I don't see how a grizzly with screen cloth will work well, even with a vibrator attached. The 1" round bar isn't going to hold up well against 12" rocks as they develop a lot of kinetic energy even falling just two feet. With the vibrator shaking the entire assembly you won't be able to get much stroke out of it without overloading the motor, especially running it continuous. and you'll soon start seeing a lot of cracked welds. With these things I've pointed out I've been there, done it.
    Mike
     
  8. lake side bob

    lake side bob Well-Known Member

    Joined:
    Oct 3, 2009
    Messages:
    133
    Occupation:
    owner operator
    Location:
    minnesota
    I am thinking of adding springs to the top of the deck between the grizzly bars and the frame to shake the top of the screen deck the bottom would not shake unless I built it with springs and also allow it to tip up (the grizzly deck)..
    At the bottom I pan on putting a hinge with pins from a mini excavator bucket to tip up the grizzly bars to clean off the mesh.
    TIPPING GRIZZLY BARS.jpg
     
  9. ol'stonebreaker

    ol'stonebreaker Well-Known Member

    Joined:
    Apr 26, 2015
    Messages:
    206
    Occupation:
    retired
    Location:
    Idaho
    The tipping is a good idea, but with screen cloth you'll have many rocks that are near size fall into a screen opening, get wedged in and only a hammer will free them. I know I'm talking more $$, but why not space the bars at 4" or even 6" and run the material that passes the grizzly over a regular vibrating screen with the size screen you wanted on the grizzly. You could probably sell all the oversize to a crushing & screening outfit if they're nearby. They'd love it to make chips. The undersize from making chips, with near 100% fracture, is excellent to blend with 5/8" asphalt rock. Just giving you some selling points for your oversize.
    Mike
     
    Last edited: Dec 13, 2016
  10. doublewide

    doublewide Well-Known Member

    Joined:
    May 31, 2015
    Messages:
    47
    Location:
    MA
    Hey farmerlund, got any pictures?
     
  11. Scrub Puller

    Scrub Puller Senior Member

    Joined:
    Mar 29, 2009
    Messages:
    3,357
    Location:
    Gladstone Queensland Australia
    Yair . . . .

    Dunno folks. Others on here have more experience with these things than me but, way back, I remember pulling my hair out trying to make ill built screens work.

    First off (in our conditions) dwell time on the screen as shown would have been insufficient . . . I used full twenty foot lengths of 3x3 or maybe 4x4 heavy wall box welded diamond wise for the bars @ (I think) forty degrees.

    I can say for sure and for certain anything at ninety degrees to the material flow tends to cause grief. I would have thought the mesh as shown would be unworkable except perhaps for removing roots and such from sand.

    Cheers.
     
  12. farmerlund

    farmerlund Well-Known Member

    Joined:
    Nov 23, 2014
    Messages:
    178
    Occupation:
    Farmer/ excavator
    Location:
    North Dakota
    Hello Doublewide,

    I don't have any and the grizzly is in a gravel pit 25 miles from home. Next time I am over by it I will see if I can drive in and get a pic. If the snow isn't to deep.
     
  13. Willie B

    Willie B Senior Member

    Joined:
    Jan 3, 2016
    Messages:
    760
    Location:
    Mount Tabor VT
    Forgive me, I haven't read the whole thread. I have a homemade one made of channel. The gaps are 5" apart. There is nothing horizontal to hang up on, yet stuff is constantly hung up. I've seen a similar one sold for a staggering amount of money that has two coarse grids. Every second bar is moveable. They are connected to a bump rail. You can bump it from below to lift the grid to let stone fall through if it gets stuck.

    Even winter sand screens built to separate frozen chunks from winter road sand have no horizontal bars to catch debris.

    Willie
     
  14. ol'stonebreaker

    ol'stonebreaker Well-Known Member

    Joined:
    Apr 26, 2015
    Messages:
    206
    Occupation:
    retired
    Location:
    Idaho
    I've worked with horizontal vibrating grizzlies and they can even get shot rock stuck in the bars.
    Mike
     
  15. lake side bob

    lake side bob Well-Known Member

    Joined:
    Oct 3, 2009
    Messages:
    133
    Occupation:
    owner operator
    Location:
    minnesota
    Willie I did not receive the photos, do you have them still available, Bob.
    03/30/2017
     
  16. Willie B

    Willie B Senior Member

    Joined:
    Jan 3, 2016
    Messages:
    760
    Location:
    Mount Tabor VT
    I'll try to figure out how.
     
  17. squidrig

    squidrig Active Member

    Joined:
    Dec 4, 2009
    Messages:
    40
    Occupation:
    cranberry grower
    Location:
    southeastern mass
    IMG_0424.JPG IMG_0425.JPG I made this out of an old flat bed , 2" spacing with 5/8" rebar hundreds of hours use and no problems with bending with plenty of 18-24" rocks going over it( other than where I hooked the bucket on the top of the bars haven't bothered straightening them yet). When it starts to plug I simply push on the top till the legs are up about a foot and let it drop the jolt generally frees everything up. As far as spacing goes much tighter than 2" and u are getting into real screener territory but if u only have a little bit of material to run and are patient u could get some material thru a screen cloth on top but as I said it will be a tuff go and u will have to rerun a lot of the material to get the fines out also moisture content is a huuuuge deal with grizzlies the drier the better good luck!!!
     
    DoyleX likes this.
  18. squidrig

    squidrig Active Member

    Joined:
    Dec 4, 2009
    Messages:
    40
    Occupation:
    cranberry grower
    Location:
    southeastern mass
    Just wanted to add that when dumping material on the cutting edge is touching the top or nearly touching so the material slides/rolls down the screen not dropped onto it
     
  19. fast_st

    fast_st Senior Member

    Joined:
    Dec 1, 2010
    Messages:
    881
    Occupation:
    IT systems admin
    Location:
    Mass
    Squid, you park right there by the pile, I'll get the 998 to screen a few loads into your bucket! Keep the window closed, it might get loud.