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small rock trommel screen in nigeria

trommel screens

trommel screens

Vermeer trommel screens were designed for efficiency and ease of maintenance. The large feed hopper sits low to the ground, making it easy to feed material into the screening drum with a variety of loading equipment.

Vermeer trommel screens were designed for efficiency and ease of maintenance. The large feed hopper sits low to the ground, making it easy to feed material into the screening drum with a variety of loading equipment.

rotary trommels | mclanahan

rotary trommels | mclanahan

McLanahan manufacturing techniques guarantee that Rotary Trommel Screens are simple to operate. The design is also intended to be safer for operators. Specially designed safety features include sectionalized cylinder covers with inspection doors, an optional mast system to remove screen panels, optional inching drives, and a cylinder jacking and brake system for maintenance periods.

To serve many industries and applications, McLanahan Rotary Trommel Screens are offered with various types of screen media that have a variety of aperture sizes depending on the application requirement. For units that are larger than 10' (3m) in diameter, McLanahan performs a finite element analysis of a unit prior to manufacturing to ensure the optimal design strength.

As the cylindrical drum of a Rotary Trommel Screen rotates, raw feed material is lifted on shelves until it nears the top of the drum. Material then falls, tumbling onto other material at the bottom of the drum. This action helps to break down softer fractions, as well as separate different types of materials. As the tumbling continues, smaller size fractions filter through holes in the screen plating, while larger material continues along the length of the cylinder to discharge at the end.

The tumbling action of the Rotary Trommel allows accurate sizing and separation that is beneficial for a variety of customers, including those looking to upgrade metallics after mass-burn solid waste incineration, to reclaim wood chips in sewage sludge composting, for accurate size separation of difficult-to-screen materials in municipal solids waste and resource recovery, and to separate and wash ores, rock and other fine materials.

You should know your feed material bulk density, the material particle size feed distribution, the tons per hour feed solids capacity, a process flow diagram showing equipment location of required unit in your processing plant, the separation or cut point(s) and the moisture content.

Proficient in both wet and dry applications, McLanahan Rotary Trommel Screens utilize a continuous tumbling action to size and separate feed material in the municipal waste, industrial and mining industries. McLanahan Rotary Trommel Screens are manufactured to be perfectly concentric machines that produce the material you need for many industries and applications.

building a trommel screen | conscious compost

building a trommel screen | conscious compost

This do-it-yourself compost sifter pairs nicely with a community-scale composting operation found at community gardens and farms. For a basic primer on aerated static pile composting check out my posts Aerated Static Pile Composting, Design & Build of Solar Powered Aerated Compost 3-Bin, and Supplies for a Basic Aerated Static Pile Setup.

Ive worked at a number of scales in the composting industry, including Fleet Manager for a large mulch and compost producer where I maintained the repairs for over $8 million in equipment (tub grinders, trommels, wheel loaders, semi trucks, etc.). Additionally, I spent my youth around farms and industrial machinery so designing and building this trommel came with fewer road blocks than others might have. Thats why Ive put this article together, to help the gardens and micro-enterprises develop a sifter, more specifically a trommel that fits your needs.

Ive wanted to build a trommel since I first strained my back screening compost over a sheet of hardware cloth. In many gardens screening or sifting is the overlooked part of the equation. Id spend hours over the course of a growing season making wonderful compost, but when it came time to sift compost for the garden I didnt have a good solution.

Equipment manufacturers in the compost industry cater to medium and large scale compost and soil producers. This makes good sense since the economics of composting generally requires large equipment. Granted there are smaller machines, such as the Sittler, that are made for landscaping services, soil blending businesses, farms, and so on, but they can carry a price tag that is difficult for a small start-up.

I started by researching DIY trommels and collected notes on design considerations. Having managed a fleet of equipment which included (8) 40 foot long trommels I knew that this project would be cutting out most of the nice features of trommels used in the industry. No conveyors, no input hopper, no brush to clean the screen and definitely no powder coated steel.

Popular mechanics ran a great article on building a trommel. I recommend you read it if youre serious about building one. That article also referred to some YouTubers (David Waltmans version and Geoff Babcocks version) with their iterations of trommels. I pulled screenshots of all the designs I liked and noted how certain areas were handled. I also looked at several videos I had of a Jet worm harvester to figure out a good rpm.

The design of the trommel drum is the most challenging part of the design/build process. The cylinder/drum/trommel is the part that does the work. It needs to be suspended in the frame while also having as little rolling friction as possible. Since it is going to be tilted it needs to be held in place to prevent it from sliding out as it rolls.

For my purposes I wanted the machine to have easily replaceable screens. I had two ideas for doing this and chose a method that I had seen in the past. I found a make a clamp kit online. The kit comes with pipe clamps and 50 feet of stainless steel banding. I used these to cut custom length pipe clamps which wrap around the screen and clamp the screen onto the aluminum ring.

Since the mesh does not act as structure (in some designs the hardware cloth is used to support itself) I needed to figure out a way to create a roundish structure without special metal fabricating equipment. To make the trommel round I went with the obvious solution, bike rims. I used the bike rims to fit 3 inch wide aluminum bands to the inside of the rims.

I used 27 bike rims that I picked up from a non-profit bike shop. If you look for rims made by Araya which were prevalent on late 70s through 80s road bikes youll be good. My trommel has five 27 Araya rims. They are close to the same inner diameter.

To bend the aluminum bands I used two 4x4s in the voids of two CMU blocks. This was a total guessing game. I just bent the metal a small amount at a time until I got a slow arc. Then repeated until it was almost a ring. I used a hack saw to trim the ring down to size.

I drilled through the rim and into the aluminum bands and used low profile bolt heads to bolt the two together. The 3 inch wide band creates a flange on both sides of the rim. This gives space to mount the screen. It also gives a place to put support wheels. The bike rim gives roundness and prevents the trommel from sliding off.

The rings are connected to four aluminum angles that run the full length of the screen. To help the screen do a better job of screening material I used 1 angle aluminum to carry material up the screen and drop it as the drum rotates.

The trommel is the core of the machine. I designed around it. I knew I would be using hardware cloth as my screen. They come in three widths at my local hardware store, 2 feet, 3 feet and 4 feet. The width of the screen informs the length of the trommel, which tells me which length lumber I should use for the frame.

To reduce wood waste and save time, I designed the frame to use dimensions that come standard from the lumber yard. I went with a low height, with the intention of using plastic tubs under the screen. Some gardens may want to fit a wheelbarrow or gang of wheelbarrows under the trommel, plan for this in advance by ensuring youll have the clearance needed for a wheelbarrow to roll under the trommel. I added corrugated metal as a chute to send compost fines down into the tubs and reduce the mess. This is an area I would change as I mention below under Improvements.

Finally, the drive mechanism. The trommel needs to rotate. There are several ways to add power transmission to the screen. You can use the support wheels to drive the drum, you can use a belt drive or chain drive, or you can put a gear on the outside diameter of the screen.

Another key component to the trommel is final RPM. How fast should it spin? I looked at trommels spinning on YouTube and counted their RPM. Somewhere between 10 and 20 RPM seems like the best fit. Mine is a little on the slower side at 12ish RPM. Im ok with that because I have the occasional worm that I dont want to hurt if it goes through the screen.

To reduce the RPM of my 1725 rpm 1/4hp motor I used belts and pulleys. There are calculators online that will help you figure out your speed reduction. Just hit up Google and ask for pulley calculator. To figure out the length of belts to use, check Google for v-belt calculator. An online calculator will ask you the distance from center point to center point of each pulley. It will also ask for pulley diameters. It will tell you the length belt to use!

The motor is attached to the top of the frame. It has a diameter output shaft. OnMcMaster-CarrI purchased two 1- diameter pulleys, a 10 diameter pulley, a 12 long D-profile steel shaft, and two pillow block bearings for shaft. The pillow block bearings are mounted to aluminum to reduce binding between the bearings.

To drive the compost trommel I originally intended to run the belt between two bike rims. When I tested this out it slipped and couldnt turn the drum. So I put the belt in the groove of the rim and it worked like a charm.

I bought some replacement electric cord at the hardware store and ran it to a plastic, weatherproof junction box. Inside the box is a typical light switch which can handle the amperage of the motor. I used weatherproof cord grips to keep the elements out of the box. The cord is clamped to the frame, which ensures it wont get wound up in the moving parts.

Hey, I cant complain. I built this trommel for under $500. It works well and it eliminates a bottleneck in the garden. Ive been using a screen on the first section and screen on the second section. The trommel screens about 2 cubic yards of input volume in an hour (depending on how dry the compost is). Finally, I can swap out screen sizes with relative ease.

ez-409: compact trommel screener by ez-screen

ez-409: compact trommel screener by ez-screen

The constant tumbling action stirs up material over and over, fluffing it, adding air to lighten it, and keeping it in contact with the rotating mesh longer. This action allows more material through faster and easier. Which makes the trommel the screener for landscapers, excavating contractors and municipalities.

So what makes the EZ-409 the better choice over other trommel screeners? One big reason is the small price. The price is low because we sell direct, one to one. No sales force. No inventory. No showrooms. No commissions.

Another reason is a whole lot of reasons: like a baked on powder-coat finish; vulcanized conveyor belts; a durable 50-HP Deutz diesel engine; auxiliary hydraulics for adding another stockpiling conveyor; and hydraulic jacks at the discharge end for proper tilt angle to adjust the material flow speed.

Like all EZ-Screen machines, the EZ-409 is easily trucked from job site to job site. Set up is quick, too. Working with a to 1 loader, the EZ-409 is designed, engineered and manufactured to provide outstanding production for specialized screening operations. With its chain-driven heavy-duty rotating drum, the slipping that occurs in wet materials on wheel-driven competitive trommel screeners is eliminated.

Argus Industrial Co., L.L.C. has a policy of continuous product improvements and reserves the right to change specifications, designs or prices anytime without notice or the incurring of any obligations. Buyer may be responsible for sales and/or use tax at time of purchase depending on State Laws.

Section 179 is a part of the IRS tax code that allows businesses to deduct the full purchase price of qualifying equipment during the tax year. To read more about Section 179, check out the links below, along with their deduction calculator to find out how much this tax code could benefit your business. As always, check with your tax advisor for more details.

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