Pit & Quarry, October 2015

native from Dakota Equipment Manufacturing Inc DEMI According to DEMI Grizzly Spring Fingers are made from flexible spring tines that are designed and forged for the direct replacement of rigid mounted grizzly bars or punch plates Theyre designed for all types of vibrating grizzly feeders the company adds What we really like about them is a couple of different things Pyatt says One the bars Its much harder to bridge them over They tend to have some slight movement in them along with the feeder so its harder for material to get bridged up between the fingers as opposed to grizzly bars Kinkaid Stone is an Illinois limestone producer using Grizzly Spring Fingers in multiple applications In addition Pyatt says DEMIs bars are narrower than traditional grizzly bars The design leads to more desired material passing through DEMI says Plus Grizzly Spring Fingers reduce the amount of cleaning needed to remove rocks from between bars According to DEMI Grizzly Spring Fingers eliminate all rock jams and allow all material to pass even wet sticky clay like material This product like most others developed because a solution was needed to a problem that has plagued the industry since the creation of vibratory equipment says Tim Holmberg president and CEO of DEMI The vibrating grizzly feeder combined with the typical tapered fixed bar or punch plate media positioned within the grizzly area of the feeder itself typically operates with intermittent surge loads of extremely dense and heavy primary based materials being dropped in from loaders or haul trucks These surge loads combined with other variables often crowd the grizzly area and its media preventing the proper conditions needed to shed cut or separate the much larger particles from smaller ones Add excessive moisture and clays into a load and Holmberg says grizzly bars can provide an increased level of aggravation You will be one frustrated equipment operator having to not only shut down production but to physically be required to hammer or pry out the stuck rocks which isnt always easy Holmberg says Pyatt agrees Grizzly Spring Fingers eliminate the rock prying bottleneck and Holmberg says they extend the life of consumable wear media in a crusher by keeping unnecessary material from going through it The finer details Although Kinkaid Stone uses Grizzly Spring Fingers over a Universal 5165 impact crushing plant that produces about 500 tph Holmberg says the product can be customized to both stationary and portable crushing equipment I can adapt it to fit into anything that has ever been built since the very beginning of conception Holmberg says There really isnt any piece of vibratory or static classifying equipment with my background that I couldnt make it fit According to Holmberg the only thing Grizzly Spring Fingers cannot provide is a specsized finished product Grizzly Spring Fingers only size in one direction he says as they do not feature any cross or woven components Pyatt came across Grizzly Spring Fingers while visiting a company Holmberg previously worked for a few years back Grizzly Spring Fingers were among the products Pyatt saw He was intrigued We later tried them in an application at our other quarry where we were having difficulty at our riprap plant Pyatt says A year or two later we purchased a new vibrating grizzly feeder for our Kinkaid quarry and we had Tims bars come in from the get go Anna Quarries whose primary market is heavy highway construction still uses Grizzly Spring Fingers in its riprap plant as well Our riprap plant consists of two vibrating grizzly feeders Pyatt says One controls the top size and the other the bottom size of the aggregate We use the Grizzly Spring Fingers with the grizzly feeder to remove the fines Previously Pyatt says fines bridged in the grizzly bars The bridging cost Anna Quarries about an hour of production time in each instance We put in Tims system and I dont think weve ever touched it since Pyatt says DEMIs system has also helped to reduce the amount of use of a pedestal mounted boom system with a hydraulic hammer We have greatly reduced how often we have to use that Pyatt says The system has proven to be a durable one too he adds At our quarry at Kinkaid our material is shot he says GRIZZLY FEEDERS 36 PIT QUARRY October 2015 www pitandquarry com