Working in Plastics – Size Reduction Solutions

Author: urcadmin | Published: Aug 2nd, 2011 | Category: Equipment, News

For the last six weeks Unlimited Resources Corporation has been working on a large waste recycling system to convert plastic scrap from plastic containers into reusable plastic particles.

The system starts with a shredder that has a ram hopper on it to force the material into the shredder. Then the material moves by way of a series of conveyors finally to a granulator for fine reduction.

A large double surge bin holds the output from the shredder to allow the shredder to work at capacity without overloading the rest of the system. A variable speed screw augur controls the feed rate into the granulator. A magnet will capture any foreign iron based material from the product stream.

Because of space considerations, the material is conveyed from place to place in the system by nine different conveyors. A blower with duct work attached sends the product into the customer’s storage bins.

With the customer’s space limitations, this has been an interesting engineering problem to move the material in stages from machine to machine instead of simple conveyors long enough to handle the height needed to move material from the floor into a hopper that is over twenty feet off the ground.

The completed system has control panels for the two main machines as well as all the conveyors with start/stops to ensure the smooth flow of material through the system. After the customer has signed off on the configuration, all the pieces will go to our paint shop for priming and then painting in colors of the customer’s choice.

The final step will be assisting the customer to set all this up on their premises and training their employees in its proper operation and maintenance.

Whether plastic or rubber, if you have an idea of what you want to achieve we can assist you with design and implementation from the planning stages to final installation. Call one of our can-do customer service folks to talk about your system or equipment needs.

Typical ways crumb rubber is produced in the United States

Author: urcadmin | Published: Apr 26th, 2011 | Category: Equipment, Technical Articles

Most of the crumb rubber produced in the US today comes from what is called the “ambient grinding process”. This process starts by taking whole tires down to 2” chips and then preferably on down to even ¾” minus size so you can then remove up to 85% of the steel to help from damaging the fine grinding equipment. Then the crumb rubber product is produced by using a crackermill mill or granulator or a powderizer. Running the rubber through these different machines allows you to achieve the size material needed to meet your particular customer’s needs.

In many cases you will actually use several of these machines in conjunction with each other to achieve the result or product that you need. This just means that the rubber is run through different pieces of equipment that essentially grind the material down into finer pieces by using friction which of course develops a substantial amount of heat during this process. Also to get smaller mesh size materials many times the rubber is further processed in what are called micro-mills. These mills are typically used in conjunction with water to create a slurry and this slurry material is then run through rotating abrasive disc to achieve the smaller size mesh particles. This is also considered an ambient grinding process.

The other method which is not nearly as popular because of the high cost of buying liquid nitrogen is the “cryogenic method”. With this type of processing you still need to get the whole tire processed down to at least two inches and preferably even smaller if feasible. Then you run this material into a freeze tunnel and add liquid nitrogen to the process and this allows the rubber to freeze and become brittle. Then this frozen material is fed into a hammermill with a small screen and the frozen rubber is shattered and made into many small pieces. The down side of this whole type of producing crumb rubber is not only the high cost for purchasing the liquid nitrogen but also the binding characteristics of this type of crumb rubber is completely different than crumb rubber that has been produced ambiently. Many manufacturers who use crumb rubber in their products have tended to stay away from this type of crumb rubber because they don’t want to have to do a lot of experimenting with their production process.

There are many different brands of equipment out in the industry today that are used in the production of crumb rubber. And of course some are better than others and a good rule of thumb when buying this type of equipment is to remember the old saying “you get what you pay for”. Much of what we presently see coming out of China works when you first purchase it but soon wears out and certainly doesn’t stand the test of time like many of the machines manufactured here in the United States. So please be aware of this and not let the initial price always be the determining factor when purchasing this type of processing equipment.

We also caution you to research your markets up-front and have a market already in place that will purchase your product once you’ve made this substantial investment to get into the crumb rubber production business. This is a very specialized industry and requires much more attention then just making TDF or rubber mulch. We welcome any questions that you might have about getting into this industry and hopefully will have the answers you need or will know someone in the industry that we can contact that will be able to get and answers for you. Unlimited Resources Corporation has sold and installed a number of crumb rubber systems and we can engineer a solution for your needs.

“Waste/Scrap Tire Recycling” – A Growing Industry

Author: urcadmin | Published: Jan 3rd, 2011 | Category: News

The United States just completed its ten year population census report and our country has almost 310 million people living in it presently. On average, the number of scrap tires generated in this country annually is about equal to the population. So this means that our country is creating around 310 million waste/scrap tires that have to be recycled on a yearly basis. And of course the primary way that these tires are recycled each year is by shredding them into pieces.

Each state has different laws pertaining to how much a tire must be torn up or processed before it can be land filled. And all states have their own agencies that watch these tire processing sites and issue them permits and most also require large bonds to ensure that these sites will be cleaned up properly when the business closes. Most states also assess fees on each new tire that is sold in that state to help with the cleaning up of all the waste/scrap tires that are created each year and also to help with the cleaning up of previous waste/scrap tire sites that were created over the past eighty or ninety years since we’ve used motor vehicles. In addition to this fee the person disposing of these tires generally has to pay a tipping fee of from $.50- $2.00 per passenger tire to the tire processing facility to ensure that the tire is disposed of correctly and will meet each state’s guide lines for tire recycling.

Currently this is what is happening with most of the tires presently being recycled in the United States each year.

Tire derived fuel markets (TDF)-estimated 2010 consumption: 150 million tires

Of these tires that were burned many were used whole in Cement Kilns while others had to be halved or quartered and even some had to be shred down to 2″ chips to meet the air permits of each of these plants. The United States presently has 41 of these Cement Kilns or facilities that are burning tires. Also many of these tires were used in Pulp and Paper mills around the country and most of these would have been shred down to 1″-2″ chips before being burned for heat. The United States presently has 12 of these facilities permitted to burn this product. The United States presently has several major Utility & Industrial Boilers that burn this product as well and these tires would also have to be shred down to 1″-2″ in size in order feed these boilers. We presently only have one dedicated site that only burns tires to produce energy and in the past we’ve had several.

Civil Engineering Markets- estimated 2010 consumption: 30 million tires

This is one of the fastest growing areas but it is still very small when compared to all the others. Most of these gains have been in drainage applications and are made up of the following applications which include: lightweight fill for embankments, sub grade insulation for roads, backfill for walls and bridge abutments, landfill construction and operation, and finally septic system drain fields. Most of these applications require the tires to be shred down in 2″-4″ size chips.

Ground Rubber Markets- estimated 2010 consumption: 60 million tires

This market also is continuing to grow at a very fast pace and it is made up of the following different types of uses. First is rubber modified asphalt, next is molded products, then surfacing/ground cover, and finally tires, & automotive. All these applications require that the tires are shred down into crumb rubber in many different size meshes.

Landfilled Tires- estimated 2010 consumption: 70 million tires

This still remains one of the primary ways of disposing of tires yet today. Many places don’t have any of the other markets available to them so they are forced to dispose of there tires by this method. And many of the landfills only require that tires are cut in half or quartered and they don’t need to be shred at all. So when we say waste/scrap tire recycling you can see that many of these tires are still ending up being used to fill up costly landfill space which could be better used on many other types of non-reusable materials.

We feel that this Industry still has a tremendous amount of potential growth over the next several years to get these tires out of the landfills and into more beneficial uses. And the largest areas of growth we believe will come in the Civil Engineering markets as well as the Ground Rubber Markets. We just advise you to do your homework and make sure that you first of all have a good source of tires available. Then make sure that your tipping fee is large enough to allow you to make a profit on the front end of processing the tire. And do a considerable amount of home work on what markets you think might be the most financially beneficial to your business in the long run on the back end.

We here are Unlimited Resources Corporation are knowledgeable in many of these markets. We would be happy to assist you in examining these markets and the equipment that is required to enter the markets.

Is Scrap Tire Recycling Right for You?

Author: urcadmin | Published: Oct 14th, 2010 | Category: News, Technical Articles

Here are several things you might want to consider when you’re looking at getting into the scrap tire recycling business. First of all you need to make sure that you have the population base in your area to sustain a tire recycling facility. Also you want to make sure that you don’t have existing competition that will cause you to discount the price that you should be paid to dispose of the tires. These are two of the things we are constantly telling our potential customers to take into consideration before jumping in.

Next you must locate a property that will work well for this type of operation. You must make sure that the property can be easily bermed up to control water run off as well as make sure that it is large enough for the storage of tires and any type of end products that you might be producing in the future. If the property has an existing building on it you need to make sure that it will work for this type of endeavor. Or if you’re going to have to build a building that you have adequate room on the property for the size building you want to build. Make sure that you have access to a very large supply of 460 volt electricity (if you’re in the USA) because all the equipment used in this type of industry requires large amperage electricity. Also when selecting this property you need to make sure that you have good access to getting semi-trucks with trailers in and out of the property. Finally you must check with the state and make sure that they will be able to issue you a permit for this location. Don’t spend money before you have your permit in place because some times this procedure can take over a year.

Then you need to decide which method or type of tire recycling that you’re going to use. Are you going to sort and cull your tires and sell off the good ones? Are you going to just cut your tires in half or quarters and landfill the material. Or are you going to primary shred your tires and landfill this material. Or are you going to take the primary shred down to 2″ chips (TDF) by using a secondary shredder or chipper. Or maybe you’re going to take the 2″ chips down to ¾”- ½” size so you can sell them as mulch. Or maybe you’re going to take this ½” material all the way down to ¼” and sell it as playground material. And of course maybe you would want to take this ¼” material all the way down to 10-40 mesh crumb rubber. Each one of these steps or stages is very costly so we truly believe that it is beneficial to make sure that you’ve got each step or stage paying for itself before you move on to the next step or stage.

Of course all this depends completely on what you’re able to develop in the way of markets for any of these end products. So many times we will try to talk a potential customer into trying to research what their end markets might be upfront before they do anything else. Many times this will point you in the correct direction that you need to develop your business around. We always try and encourage our customers to do their homework up front because we don’t want to see you fail. We’d much rather have happy customers that will come back and purchase more equipment from us as their business continues to grow instead of ones that are destined to fail because they didn’t do the proper homework up front.

Our main focus over the 14 years that we’ve been in business is to always tell everyone that they must walk before they run. This means they should start out small and gradually work their way up through all the different phases of the business before they go out and spend millions of dollars to find out that this business isn’t for them. Shredding tires isn’t an easy business and with this endeavor comes many challenges as it does with most any other business venture. And we’re always here to talk to should you need any advice or have any questions about the industry as a whole. We want you to succeed and we’re here to hopefully point you in the right direction. Not that we know everything about the industry but if we don’t have the answer we will more than likely know someone to send you to for the answer. This is a very small industry and many of the people involved have worked together over the years to get much accomplished with not only governmental regulations but with end product acceptance as well. Again we encourage you to contact the “can do crew” at Unlimited Resources Corporation for any questions you might have regarding this industry.

Portable/ Standby/ Backup/ Emergency Power Electrical Generators

Author: urcadmin | Published: Oct 11th, 2010 | Category: Equipment, News

When you have the need for portable electricity where none’s available or have the need for a backup emergency generator then the company to call is Unlimited Resources Corporation. Our company currently has several low houred power generator sets in stock and ready to sell. We have test run all these units and checked to make sure they were performing up to standards. And the most important thing about our generator sets is that they are very affordable when compared to purchasing a new similar size unit.

In today’s world many places don’t have high voltage high amperage electricity available where you need it. And the cost of putting this type electricity into your building is many times unaffordable. So the only alternative that you have is to lease or purchase a portable generator set to be able to operate much of today’s equipment. Also many times your production equipment can’t be interrupted and so you need to have a standby generator set available to keep your plant operating efficiently. This is why we have made an effort to find several good lower priced generator sets that we could re-market to meet these customer needs.

For years we have been taking stationary Tire Shredders and making them into portable machines and powering them with generator sets. We have also used generator sets to power wood grinders and many other types of Recycling Equipment over the past fourteen years we’ve been in business. So its not that we haven’t already been doing this to meet our customers needs it is that we just never directly marketed the generators by themselves. So now when you need Portable/ Standby/ Backup/ or any type of Emergency electrical power the ones to call are the “can do crew” at Unlimited Resources Corporation.

List of Electrical Power Generators that we have in our present inventory.

150 KW Lima Generator Set, powered by a Caterpillar Diesel engine: A very nice generator set that was used by a city as a standby emergency generator for a hospital. This unit shows only 718 hours on it and is rated at 187.5 KVA and is running at 60 Hertz. This unit is presently set up to produce 230 volt electricity but we could easily change it out to be 460 volts if that’s what you needed. This unit is skid mounted and comes complete with its own radiator for cooling and has its own battery charging alternator. It also has its own battery storage holder that is set up to hold two 8-D batteries. Note: unit has new Caterpillar yellow paint, but doesn’t have its own fuel tank. Note also unit does come with a 400 amp disconnect.

250 KW Onan Generator Set

, powered by a 25000 series Allis Chalmers industrial Diesel engine: A very nice generator set that was previously owned by a city and used as back up power for a pumping station. This unit only shows 1178 hours on it and is rated at 300 KVA and is running at 60 Hertz. This unit is currently set up to produce 460 volt electricity but we could easily change it to be 230 volts if that’s what you needed. This unit is skid mounted and comes complete with its own radiator for cooling and has its own battery charging alternator. It also has its own battery storage holder that is set up to hold two 8-D batteries. Note: unit has new Caterpillar yellow paint, but doesn’t have its own fuel tank. Note also: This unit does come with a 400 amp disconnect.

190 KW Cummins Generator Set

, powered by an 855 series Cummins industrial Diesel engine: A very nice generator set that was previously owned by a city and used as stand by emergency power for a sewer plant. This unit only shows 2673 hours on it and is rated at 238 KVA and is running at 60 Hertz. This unit is currently set up to produce 460 volt electricity but we could easily change it to be 230 volts if that’s what you needed. This unit is skid mounted and comes complete with its own radiator for cooling and has its own battery charging alternator. It also has its own battery storage holder that is set up to hold two 8-D batteries. Note: unit has new Caterpillar yellow paint, but doesn’t have its own fuel tank. Note also: This unit does come with a 600 amp disconnect.

150 KW General Electric Generator Set

, powered by a 6 cylinder International Harvester industrial Diesel engine: A very nice generator set that was previously owned by a city and used as standby emergency power. This unit only shows 782 hours on it and is rated at 187.5 KVA and is running at 60 Hertz. This unit is currently set up to produce 460 volt electricity but we could easily change it to be 230 volts if that’s what you needed. This unit is skid mounted and comes complete with its own radiator for cooling and has its own battery charging alternator. It also has its own battery storage holder that is set up to hold two 8-D batteries. Note: unit has new Caterpillar yellow paint, but doesn’t have its own fuel tank. Note also: This unit does come with a 400 amp disconnect.

Business Stimulus Package Poised to Help you Pay for Equipment in 2010 with Tax Savings

Author: urcadmin | Published: Sep 23rd, 2010 | Category: Equipment, News

Has the weak economy got you concerned?

Have you failed to receive your part of the Government bailout or stimulus money?

Well have no fear because Congress is finally about to pass a bill that will substantially help you, the small business owner with your bottom line if you are considering any kind of plant expansion by year’s end. They have finally figured out that most of the jobs here in the United States are provided by you, the small business owner. So don’t let this tremendous opportunity pass you by because you just might miss your boat!

It looks very favorable that they will soon pass legislation that will allow for all small business owners to be able to write-off 100% of the purchase price of capital assets for purchases up to $250,000. Also they are going to allow 50% bonus deprecation for anything over this amount on any new machine purchases. In addition they are going to be setting up a 30 billion dollar lending fund for small businesses to be administered by small banks. So many of you who want to purchase equipment will now have the funds available once this legislation passes and is signed by the president.

So please ask your accountant what effect this bill will have on your bottom line!!

So now you know you’ll be receiving some major tax breaks by adding new production capacity to your plant. Please give our staff at Unlimited Resources Corporation the opportunity to tell you what equipment we have to meet your needs. Our company has been in business for over fourteen years and we’re very experienced in the refurbishing of all types of tire recycling equipment. In many cases, we can have your equipment up and operating in a very short time frame.

If you’re looking to buy a primary tire shredder or a secondary shredder/ chipper, or looking to make 2″ TDF chip, or ¾” mulch, or ¼” mulch, or 10-40 mesh crumb rubber then you need to give us a call because we more than likely have the equipment in stock to meet your requirements. We also will assist you in the setup and or erection of this equipment. And then we will show you how to properly operate and maintain this equipment once it’s operational.

We strive to keep in stock equipment for most every type of tire recycling. And many times if we don’t have it in our present inventory we will have access to it through our large network of small business owners like you who we strive to serve with the buying, selling, refurbishing and brokering of tire recycling equipment. Who would know your equipment better than us because we don’t just sell one particular brand name we refurbish most every brand and model machine made here domestically as well as several from other countries.

So make your first call to URC and see if we can’t help make your business more successful whether you need to purchase more equipment or get rid of excess equipment that you might have sitting around your plant location. Let Uncle Sam along with URC help make your bottom line look better for 2010! (see attached plant we currently have available for sale at a very attractive price).

Equipment List

Using 62 X40HT Granutech/Saturn as primary shredderProposed Whole Tire down to 10-30 Mesh Crumb Rubber PlantItem number: Item Description:

Custom built in-feed conveyor (shredder)
Model 62 X 40HT Granutech/Saturn shredder
200 hp Hydraulic Power Pak
Electrical control panel for shredder
Custom built shredder out-feed conveyor
Bulk Handling Systems rotary disc screen classifier
Custom built short re-circulating conveyor
Custom built long re-circulating conveyor
Custom built sized material out-feed conveyor
Custom built surge/ storage bin
Custom built screw auger conveyor
Custom built in-feed conveyor (Grizzly)
Model M80 Granutech/ Saturn Grizzly
Electrical control panel for Grizzly
Custom built duct work (Grizzly)
Vibratory conveyor (out-feed for Grizzly)
Cross belt magnet
Cyclone, airlock, and stand (Grizzly)
Custom built screw auger conveyor
Custom built screw auger conveyor
Custom built surge/ storage bin
Custom built screw auger conveyor
Custom built in-feed conveyor (Cumberland)
Model 50H Cumberland granulator
Electrical control panel for Cumberland
Custom built duct work (Cumberland)
Cyclone, airlock, and stand (Cumberland)
Custom built screw auger conveyor
Custom built out-feed conveyor/ with stainless section
Cross belt magnet
Custom built surge/ storage bin
Custom built screw auger conveyor
Model 50 VMS Foresburg gravity table
Custom built screw auger conveyor
Custom built duct work (Gravity)
Custom built screw auger conveyor
Cyclone, airlock, and stand (Forseberg)
Custom built screw auger conveyor
Drum magnet & stand
Custom built screw auger conveyor
Custom built in-feed conveyor (Cracker Mill)
24″ X 32″ double roll Cracker Mill
Electrical control panel for Cracker Mill
Custom built duct work Cracker Mill
Cyclone, airlock, and stand (Cracker Mill)
Custom built screw auger conveyor
Custom built duct work (dust collector)
Custom built screw auger conveyor
6’ X 12’ double deck Rotex screen
Custom built screw auger conveyor
Custom built screw auger conveyor
Custom built screw auger conveyor
Custom built surge/ storage bin
Custom built screw auger conveyor
Custom built screw auger conveyor
Automated weighing and bagging station
Large Dust Collector
Custom built screw auger conveyor
Large Blower
Electrical control panel (dust collector & gravity table)

Making the Best Better in Tire Shredding Equipment

Author: urcadmin | Published: Sep 15th, 2010 | Category: Equipment, Technical Articles

Unlimited Resources Corporation currently has three Columbus McKinnon tire shredders in inventory that we have had modified to have hardened heat treated rotors in them. We have found these hardened heat treated rotors to be much more durable than the normal mild steel rotors that are in the machines when there built new and shipped from the factory. These rotors offer a much more durable knife seat area that stands up much better to having a knife broken out of the machine. Also they stand up better because we not only built our rotors out of heat treated 4140 steel but we’ve also chosen to insert all of the bolt holes on the rotors with replaceable 4140 hardened steel inserts. This allows for any repairs that need to be made to the rotors to be made instantly by simply screwing out the old insert and screwing in a new insert. No more having to weld up the holes and drill and tap the holes out and maybe you get good threads. (Many times you don’t!)

We have tried to address some of the weaknesses we’ve found in these shredders because they are without a doubt some of the most productive machines in the industry today. Also we have configured these machines to have the cascading rotor arrangements so this allows you to use your knives over again and again. With this configuration if you purchased both a primary Columbus McKinnon two speed shredder and a Columbus McKinnon chipper together you would be able to use the same knife for a total of six times by simply Blanchard grinding the knife down to the next size in between knife changes. This cuts your knife replacement cost substantially over the life of the machine because you can usually Blanchard grind one of these knifes for around $4.50-$6.00 compared to having to purchase a new knife at around $23.00-$25.00.

We currently have one primary Columbus McKinnon two speed shredder in inventory with 2.2, 2.1 and 2.0 cascading rotor arrangement. In addition we have one new style Columbus McKinnon chipper with the direct mounted Nord gear box and 200 H.P. electric motor and this unit has the 2.2, 2.1 and 2.0 cascading rotor arrangement. We also have one of the older style Columbus McKinnon chippers with the remote mounted and belt driven Dodge gearbox. We have replaced the electric motor with a 250 H.P. 1150 rpm motor to allow this machine to work great as a primary passenger tire shredder as well. This machine has the 1.9, 1.8 and 1.7 cascading rotor arrangement.

We truly believe that with these changes being made to these machines they will be much more user friendly to operate and will stand the test of time much better than what we’ve seen their predecessors be able to do. Our goal was to take one of the most productive machines in the industry and make it considerably less maintenance intensive.

We have gotten considerable feed back from the machines that we’ve already sold with these up-dates already made, and customers love the changes that we’ve made to the machines. So if you’re looking to purchase a Columbus McKinnon tire shredder or chipper please check with us before you purchase a machine and let us show you our improvements and let you talk to someone who is operating one of these machines with these current improvements already in place. All of us at Unlimited Resources Corporation think you will be impressed with these changes and hope you will call to find out more information on the cost savings of owning and operating one of these retro-fitted machines. Call 800-423-9062 today and ask for either Richard or Elaine for more details. Our one and only goal was to take one of the best shredders in the market place and make it even better!!

Choosing Tire Recycling Equipment

Author: urcadmin | Published: Sep 15th, 2010 | Category: Equipment, Technical Articles

Unlimited Resources Corporation specializes in all types of Tire Recycling Equipment. We also have built several whole tire shredding systems both stationary and mobile. Many of these have only been primary shredders, that is, they only cut the tires in several pieces or strips. We have also built many systems that take the whole tires (semi-truck and passenger) down to 2″ tire chips (TDF) Tire Derived Fuel. These shredding jobs are generally performed by what the industry generally calls a shear shredder and we’ve been involved in refurbishing many brands of these machines over the years. Some of the brands that we’ve rebuilt are Granutech/ Saturn or Mac/Saturn, SSI, Shred Tech, Shred Pax, Eidal, American Pulverizer, Jordan Reduction Technologies, Mitts & Merrell, & Williams. And each one of these brands of shredders will make several different size or models of machines as well. And also many times the same size or brand machine is available in either a hydraulic version or an electric version.

We have custom built many systems over the years and were always interested in giving you quotes on any special projects or ideas you might have to meet your particular shredding needs. You might want to consider some of these items before you decide which type of shedder to buy for your application if you are wondering whether or not the machine should be mobile or stationary.

Some of the considerations for having a stationary shredder:

Have a good continual supply of tires available at one central location.
Have a good industrial site available with or without a building.
Have 3 phase high voltage electricity available economically
Have a good work force in place locally
Have a permit already in place for your facility

Some of the considerations for having a mobile shredder:

Have more than one site that you want to keep shred on a regular basis.
Have more flexibility on bidding tire clean-up sites.
You don’t have to have high voltage electricity available (because we generally fit these mobile machines with their own generator sets).
Electric rates are out of reason for a particular area or region.
You don’t need any permanent location or facility.
They can easily be moved from one site to the next in just a few hours of preparation work.

Note: We have also sold shear shredders for many other applications than just tire shredding. Some of these applications are as follows; wood shredding, wire shredding, plastic shredding, fiberglass shredding, metal & plastic drum shredding, aluminum shredding, light metal shredding, paper & cardboard shredding, MSW shredding, and e-waste shredding.

It all comes down to which machine you need to take care of your customers’ needs the best, and what machine will perform best for you under your particular circumstances. We are always glad to assist you with these types of decisions since we’ve been in this business now for over 14 years. So we generally will have a good feel for what would work best for you and your particular needs. So next time you need any type of shredding or Tire Recycling Equipment please don’t hesitate to give us a call at 800-423-9062.

Hammer replacement on Tub-Grinders

Author: urcadmin | Published: Aug 24th, 2010 | Category: Equipment, Technical Articles

We here at Unlimited Resources Corporation would like to take a few minutes to tell you the proper way for replacing hammers on your Tub-Grinder. As you know there are two basic types of hammers. The first type is the “swinging hammer” and these can usually be associated with the small low horsepower machines that are used by the small production owner. These are generally just a throw away type hammer and they can generally be run for a while and then turned and run for a while longer till you wear the other side of the knife down to where its not efficient to run it any longer. The second type of hammer is the “fixed hammer” and they typically are offered in several different designs and some even offer replaceable wear tips so you don’t have to change the hammer all the way out. You just replace the tip. These fixed hammer machines are generally the “big boys” or the “work horses” of the industry and are generally from 350 horse power to 1500 horse power in size.

Now most of the newer tub grinders are equipped with a tilt tub to make changing these hammers much easier than what the older models used to require. The first priority is to get the machines cutting area cleaned out completely to help make changing the hammers a much easier process. Second you must either tilt the tub or remove the cover on the older units to reveal the end of the hammer mill shredder and this is where you will find the lock that holds all the hammer-mill shafts or rods into place. Here you will loosen this plate by usually unscrewing either 3-or 4 bolts. Then this will allow for the lock to turn and this should expose the end of all the rods that go through the hammers and lock them into place. Many times these rods have a threaded hole in the end of the rod and this allows you to pull them if they are too tight to get out with normal amount of sliding effort.

You want to carefully mark down where each of the hammers is located on these rods so that you can get them loaded back into the machine in the proper place once you’ve pulled the rods out of place. Before you install the new hammers they need to each be weighed and the weight written down for each hammer. Then you need to carefully match each of these hammers up with another one of similar weight and this can easily be achieved by either welding a little on one or grinding a little on one to get the weights so that they match as close as possible. When you install these hammers back into the machine make sure that you match up the two hammers that you have grouped together so that they go directly across from each other in the machine. This way you have balanced the mill and this will make the machine operate much better and it will also prevent the destruction of bearings on the main shaft of the mill. This simple procedure will generally cut down a tremendous amount on the vibration that the mill causes as well.

We have visited many sites where they just removed the hammers and then installed new ones and never paid any attention to how the old hammers came out of the machine. They didn’t make any effort to weigh each hammer because they were all made by the same factory so they assumption was that they should all weigh the same. Well the fact is that we’ve seen the weight in these factory made hammers vary as much as several ounces and this can cause premature damage to your mill bearings and cause a tremendous amount of vibration damage to be done to the whole machine. So we can’t stress enough the importance in weighing these hammers individually and matching them up in identical weight pairs and making sure that you install them across from each other in the machine.

Also many times these rods that hold the hammers in place will need to be replaced because they’ve become worn so generally it’s a good ideal to order new rods while you’re ordering the new hammers. The hammers need to be replaced whenever the machine starts going down in production. New hammers will normally run close to the screen and this causes the shearing action to be greater and thus the machine operates more efficiently. If the hammers are worn they tend to be further away from the screen and this causes the shearing action to lessen thus making the way the machine operates less efficient.

Finally always make sure that the screen in your machine doesn’t have too much wear on it because it also can contribute greatly to the loss in the shearing action that the machine has because of this wear. So carefully inspect your screen each time you change out your hammers and they will generally need changing out about every four to fives times that you change your hammers as a rule of thumb.

If you follow these simple steps it should ensure that your hammer mill shredder part of your tub grinder operates at its greatest efficiency. Note: the improper placement of hammers in these mills has caused many mill bearings to fail prematurely. You and only you can keep this from happening to your machine!

Wood Waste Recycling equipment

Author: urcadmin | Published: Aug 23rd, 2010 | Category: Equipment, News

All of us here at Unlimited Resources Corporation would like to assist you in your next purchase of wood waste recycling equipment. We always have the following types of wood waste recycling equipment for sale. Tub-Grinders, Horizontal Grinders, Compost Turners, Screens, Hammer mill Grinders, and Chippers.

We generally have several Tub-Grinders in inventory that have been refurbished and generally have a good number of others that we have available to broker. Some of the brands that we would normally have available for sale would be Diamond Z, Morbark, WHO, Hogzilla, Pro-grind, Duratech, Precision Husky, Vermeer, Haybuster, as well as many others.

We sometimes have a horizontal grinder available here in our inventory for sale but we always also have many horizontal grinders available to broker. Some of these brands that we normally have available for sale would be Diamond Z, Petereson Pacific, Bandit Beast, Doppstadt, Maxigrind, Rotorchopper, Biogrind, Vermeer, CBI, Morbark, as well as many others. We have refurbished many tub-grinders over the past fourteen years and have much insight to the proper operation of these types of equipment. Also we’ve been around several of the horizontal grinders in the past few years and are beginning to get a better feel for how these machines operate as well. So when you have the need for this type of equipment please give us a call.

In addition we generally have at least a couple of refurbished compost turners in inventory for sale here at our location as well as also having several more units available to broker. Some of the brands that we generally have available for sale would be Scarab, Wildcat, Frontier, Scat, Mid West Bio Systems, Aeromaster, as well as many others. Our company has refurbished many of these units since we began our business and have a good knowledge of how each of these machines performs.

When you have a need for a sizing screen please give us a call at Unlimited Resources Corporation. We many times will have a screen here in inventory at our location but will also always have several units available to broker. Some of the brands that we generally have available for sale would be McCloskey, Morbark Powerscreen, Re Tech, Royer, Wildcat, Erin as well as many others. Of course these machines are available in all different shapes and sizes depending on the materials makeup and the volume of materials needing to be processed.

So when it comes to purchasing wood waste recycling equipment let your first call be to the ones that have worked in this industry for over fourteen years and understand what machine you need for your particular application.

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