Drum screen, with large volume, is a cylinder. It mainly consists of the motor, reducer, drum device, screen, frame, sealing cover, inlet and outlet. The drum device must be equipped with a steel ring to prevent the deformation of the drum screen.
It is widely used in the screening of raw coal, crushed stone and other materials in alumina plants, power plants, coking plants, cement, mining, metallurgy, building materials, coal chemical industries, etc. It is key screening equipment in the coal chemical industry.
Linear screens mainly screen fine particles with light specific gravity and low-hardness, mainly dry materials. They are usually used in food, chemical, building materials, and pharmaceutical industries.
When the materials are fed into the drum screen, due to its tilt and rotation, qualified materials (undersize product) are discharged through the discharging port at the bottom of the rear end of the drum, while unqualified materials (oversize product) are discharged through the other discharge port.
The linear vibrating screen adopts a vibrating motor as the vibration source, so the material is thrown up on the screen. Then several specifications of undersize products and oversize products are produced through the multi-layer screen. Finally, they are discharged from their respective outlets.
Generally, the inclination of the drum screen is 5-30. It is generally close to 30 for light and fine materials. When the material is heavier, it can be less than 20, and in special cases, 5-10.
The inclination of the circular vibrating screen is suitable when it is 20, and the general range is between 16-20. If the inclination angle is less than 16, the material on the screen may not move smoothly or roll upward.
The vibrating screen is screening equipment with a vibrating motor as the vibration source, so its screening accuracy is high. The trommel screen is high-output screening equipment with the screening accuracy not as high as the vibrating screen.
As for the circular vibrating screen, the material moves in a parabolic circular trajectory on the screen surface, so the material is dispersed as much as possible to improve the material's bounce force.
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When the material enters the drum device, due to the inclination and rotation of the drum device, the material on the screen surface is turned over and rolled, so that the under-screen material smaller than the screen hole size is discharged from the screen hole, and the screened material larger than the screen hole size is discharged from the tail through the drum.
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Capacity 0-350 T/H Feed Size<90mm Processible Materialore, coal, sand, gravel, chemical, soil, etc. Applicationsmedium-fine materials grading & screening in the mining industry, quarry, chemical industry, trommel screen usually equipped with 60-200 mesh sieve, and water flush pipe.
DescriptionTrommel screen also knowns as a rotary screen, is a versatile screening machine that can size and separate feed materials in the mining, quarry, aggregate, dirt industry. JXSC Trommel Screens can precisely classify materials into multiple sizes from one unit. Type of trommel screenswe offer a wide range of sizes and capacities, custom made stationary gold wash plant or portable trommel screen (wheel type) to the needs of individual customers. Trommel screen designJXSC Rotary Trommels offers various types of sieve plates (material, mesh, shape) to serve wide applications. custom made 2-3 layers. The Rotary Drum screen has the advantages of simple structure, easy operation, high efficiency, large capacity, easy-clean, no jam. Gold Mining TrommelIn the mining plant, the trommel screen usually works with grizzly hopper, vibrating grizzly screen, etc. Buy trommel screenThese information helps our engineer to select the right machine for you, basic: feed material particle size, density, feed solids capacity, moisture, clay. Whats more, know your requirements such as the type of screen media, protective safety covers, etc.
Work Principle of Trommel ScreenAs the rotary drum screen rotates, the raw feed materials are lifted and fall. The tumbling and lifting actions help to break down agglomeration, and separate materials to different sizes. As the rotation continues, the smaller size material is filtered through sieve mesh, while the larger material finally discharges at the end. Trommel Screen ManufacturerJXSC produces and builds the portable trommel screen, portable trommel screening plant over decades of years. Welcome to contact us to get the best trommel screen price. Advantages It is a highly economically viable option adequately suitable for small to large volume processing gold mining wash plant. The screen features various filters for different heavy-duty drums that ensure complete separation of fine materials. The design has end-user flexibility that allows for screen replacements depending on mesh sizes, mini trommel, small trommel screen for sale. Multiple layers of screen to enhance the sifting process. It features changeable screen plates so that worn-out trommel screen parts can be replaced. Trommel screen has high efficiency and a big capacity for different volumes of materials. The screen is uniquely designed to facilitate higher capacities, provide longer screen life and avoid material clogging.
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.
There are a number of available material screening solutions. Material specifications will dictate the type of screening equipment that is most efficient for the given process. Trommels are one of the most commonly deployed screens for a number of jobs from compost to municipal solid waste. However, despite their wide usage, trommel screens have a number of disadvantages that can make them less than ideal.
While trommels are frequently used to process materials, they do so inefficiently. Trommel screens are simple in design: a rotating cylindrical drum with perforation cavities which allow undersized material to pass through the screen.
The advantage of this design is a relatively lower cost. In fact, small, basic trommels can be made at home with relative ease. However, for heavy duty industrial applications, that same simplicity results in an overall inefficient design.
When compared to other solutions, like vibrating screens, trommels simply cannot handle the same volume of materials. While rotating, only a portion of the screen is being utilized for sizing. Comparatively, the entire screen surface of other material screening solutions can effectively size materials. This not only places the trommel drum at a volumetric disadvantage to other screening equipment, but can also lead to additional material flow concerns.
When screening multiple particle sizes or when material begins to back up, trommels also have the disadvantage of plugging. Plugging occurs when a larger feed material gets stuck in the screen aperture. This can lead to further plugging or back up of material traveling through the drum.
Much like plugging, when sorting wet materials, trommel screens are prone to blinding. As wet feed materials, such as compost or solid waste, pass through the rotating drum, they can begin to clump and stick to the screen. This can cause further materials to build-up, leading to less efficient sorting if not halting production.
Even when blinding does not require immediate attention, it still requires cleaning of the trommel and can lead to additional maintenance. Cleaning of the drum and replacing trunion wheels and cleaning brushes can be costly.
Plugging, blinding, or simply regular use can cause damage to the trommels drum. While some minor damage is to be expected and can be prevented through proper usage and care, larger damage can be costly. One of the biggest disadvantages of the trommel screens design is the inability to replace part of the drum when damage occurs.
Aggregates Equipment, Inc. manufactures screening solutions which overcome the disadvantages of trommel screens. The BIVITEC Screen operates using a flip-flow principle and features a dual-vibratory process which prevents clogging and blinding.
The BIVITEC is an ideal screening solution for applications commonly using trommel screens, including sorting C&D waste, roofing shingles, compost, and more. Contact our sales team to request a BIVITEC for your operation.
A trommel screen is named for the screened cylinder used to separate materials by size, for example, separating the biodegradable fraction of mixed municipal waste or separating different sizes of mulch or crushed stone. Production rates can vary from 20 to30 yardsan
hour toseveral hundred yards of materialan hour based ona number of factors described in this article.We are going to focus on portable trommel screens in this article. There are a number of manufacturers that provide a large range of stationary trommel systems; including several of the manufacturers of portable units that I will discuss below.Current trommel screen manufacturers include: McCloskey, Doppstadt, Powerscreen, Wildcat (Vermeer), Komptech, Terra Select, and Screen Machine Industries. Other brands of trommel screens that are no longer available new include: Retech, Royer, Finlay, Extec, Portec, Morbark, Diamond Z.There are a number of differences between each brand, but some of the primary differences that you should be aware of include:
It can be difficult for first time buyers to recognize the difference in trommel screen performance. It is easy to get caught up watching how fast material goes through the machine rather than how well the machine actually sorts the material. True trommel performance is based on its ability to sort the greatest percentage of "fines" out of a given material over a specified amount of time (such as per hour). Performance will vary greatly based on the size of the screen cloth as well as across different materials types. It is sufficient to say, however, that great amount of screen cloth, and the longer the material stays in the drum, the higher the percentage of fines will be sorted out per load. Each operator will have to experiment some with their material to find the best balance of sorting ability and production for their operation. At most, you want to ensure that the feed rate for the trommel is no faster than your ability to feed the machine. This will maximize the sorting percentage that the trommel is capable of without slowing down your loader. Your ability to load the trommel will depend primary on: the size of your loader and bucket, type of material, and distance of the trommel from the raw material. Keep in mind that your loader will have to spend time moving the output piles if you do not have separate long stacking conveyors. With smaller trommel screens, your loader may be able to easily keep up with the machines processing capabilities in which case you will have to balance the sorting percentage with the cost of a idle loader and operator.Other features of trommel screens:
If you have any questions, or anything you would like to add to this introduction to Trommel Screens, please let us know. Also, if you need any help finding the right machine for your application don't hesitate to contact us via phone, or through our online contact form. If you are looking for a used trommel screen, please see our selection of used trommel screens for sale. If you need any help selecting a new trommel screen, we can provide an unbiased opinion of the various brands currently available.