In the mineral processing area, the trommel screens(aka. Rotary drum screens) and vibrating screens are both widely used screening & classification equipment. But whats the difference between the trommel screens and vibrating screens, and how to choose the most suitable screens for your mineral processing application? Or even how should we choose the right screening equipment for specific mining conditions?
Thorough we all may know that they are both are widely used screening equipment, but the different working methods and principles also mean the difference in output, as well as the types of materials suitable for screening processing.
Vibrating screens are screened using the exciting force generated by a vibrating motor and belong to vibrating screens. Commonly used mine vibrating screens include circular vibrating screens and linear screens.
The trommel screen is another screening form. During the screening process, the equipment will not vibrate, but generally, the motor and reducer drive the drum to rotate through the bearing. The material in the drum passes through the screen from high to low due to the rotation of the drum. And it is successfully screened out, so the trommel screen belongs to a type of rolling screening.
trommel screen: It is a cylinder. The outer surface of the cylinder uses one or more layers, or several sections of screens to increase the screening specifications. The volume of the trommel screen is generally large, mainly including motors, reducers, drum devices, screens, and machines. It is composed of a frame, a sealing cover, and an inlet and an outlet. A steel ring must be added to the drum device to prevent the trommel screen from deforming.
The roller device is installed on the frame obliquely. The motor is connected with the roller device through a coupling through a reducer, and drives the roller device to rotate around its axis. When the material enters the drum device, due to the tilt and rotation of the drum device, the material on the screen surface is turned and rolled. The qualified materials (products under the screen) are discharged through the outlet at the bottom of the rear end of the drum, and the unqualified materials (on the screen) The product is discharged through the discharge port at the end of the drum.
Using the vibration motor as the vibration source, the material is thrown up on the screen while moving forward in a straight line. The material enters the inlet of the screening machine evenly from the feeder, and produces several kinds of screens through the multi-layer screen. The upper and lower objects are discharged from their respective outlets.
The screen surface is fixed on the screen box, and the screen box is suspended or supported by springs. The bearing of the main shaft is installed on the screen box and is driven by the pulley to rotate at high speed. The eccentric counterweight plate is installed on the main shaft and generates centrifugal inertia force with the rotation of the main shaft, so that the screen box forms an approximate circular orbit vibration.
The trommel screen can be divided into single-layer, double-layer and three-layer vibrating screens according to the number of layers of the screen. This vibrating screen is also similar, according to the number of screen surface layers can be divided into single-layer, double-layer, three-layer and four-layer vibrating screen.
The vibrating screen is a screening equipment with a vibrating motor as the vibration source, so the screening accuracy is high. The trommel is a high-output screening equipment, and the screening accuracy is not as high as the vibrating screen.
For the trommel screen, the material is turned over and rolled in the drum, so that the material stuck in the sieve hole can be ejected to prevent the sieve hole from being blocked. For the circular vibrating screen, the material moves in a parabolic circular trajectory on the screen surface, so that the material is dispersed as much as possible to improve the materials bounce force, and the material stuck in the screen hole can also jump out, reducing the hole blocking phenomenon.
Vibrating screen and trommel screen have their own working methods and screening principles. Some raw materials can be screened through them. However, for different sites and different material requirements, suitable screening machines should be selected to achieve better screening results.
This paper describes the design and testing of a trommel screen system for the separation of undersized particulates. The trommel screen system consisted of a cylindrical separation device that rotated to perform size separation. A series of experiments were carried out at room temperature to demonstrate the screening efficiency of this method under different operating conditions. The dynamic model and velocity analysis of undersized particulates in the trommel body are also discussed. The experimental results show that the screening efficiency could be enhanced by using a mass flow rate of 360cm/s, a dust concentration of 10,000ppmw, an inclination angle of the trommel body of 5 and a rotational speed of the trommel body of 43rpm. Moreover, the results also indicate that this type of method could be useful for dust particulate separation in a moving granular bed filter system. The main focus of the current study is the development of a trommel screen system for a moving granular bed filter that could be applied in a high-temperature environment.
Xinxiang Tongxin Trommel Drum Screen For Sale Large Quantity Of Screen Overviewof GTS Series Trommel Trommel screen widely used for alluvial gold sieving and graded washing.It provides a simple, efficient and economical solution to upgrade a wide range of material and optimize the subsequent process steps of recovery. This method of screening helps to reduce operating and investment cost and to increase product quality, while allowing rapid and large volume processing. Specifications Features 1. Low cost, for alluvial gold plant, sand plant; 2. Small Volume,Easy Movable,Support Wheels; 3. Strong processing ability; 4. High-efficient and power-saving; 5. Easy and convenient operation; 6. Strong body, our engineer has redesigned the frame, use thicker and stronger material. Apply in Industry 1. Stone yard for grading of large and small stones, and separation of soil and stone powder. 2. Separation from sand and gravel in the sandstone field. 3. Coal industry for the separation of lump coal and coal powder and coal washing (part of coal washing machinery) 4. Chemical industry, the mineral processing industry is used for the classification of large and small blocks and the separation of powdery substances. Working Principle The drum screen consists of motor, reducer, chassis, seal cap, inlet and outlet. When the material enters the drum device, due to the tilt and rotation of the drum device, the material on the screen surface will turn over and roll, and the qualified material (the product on the screen) will be discharged through the outlet at the bottom of the back end of the drum, while the unqualified material (the product on the screen) will be discharged through the outlet at the end of the drum. Because of the material in the drum of the GTS600 drum screen with turnover, rolling, so that the material stuck in the screen hole can be ejected, to prevent the screen hole blocking. Technical Parameters Model Capacity(m/h) Diameter of Sieve Outside(mm) Length (mm) Power(kw) Dimension(mm) GS1230 20-50 1200 3000 3 3580*1590*1675 GS1530 40-80 1500 3000 5.5 3980*1790*1975 GS1830 80-150 1800 3000 7.5 4150*1870*2240 GS2030 130-300 2000 3000 11 4230*1950*2950 Our Service 1. We have professional engineer team ensure to provide the most professional equipment; 2. Professional engineers team can choose the right equipment for you; 3. We can provide thorough after-sales service to ensure the proper use of machine. 4. We can provide OEM customization. 5. We Provide video installation instructions; 6. We offer 24-hour online consulting service; If you want to get more information of product, please contact us!
Trommel screen widely used for alluvial gold sieving and graded washing.It provides a simple, efficient and economical solution to upgrade a wide range of material and optimize the subsequent process steps of recovery.
When the material enters the drum device, due to the tilt and rotation of the drum device, the material on the screen surface will turn over and roll, and the qualified material (the product on the screen) will be discharged through the outlet at the bottom of the back end of the drum, while the unqualified material (the product on the screen) will be discharged through the outlet at the end of the drum.
Trommel screen is one of the most frequently-used sieving equipment in the treatment of solid waste. It adopts cylindrical screen body to classify the solid waste according to different particle sizes. Under the effect of gravity, undersize solid waste (fine material) passes through sieve mesh and drops into the receiving hopper at the bottom, while the oversize waste (coarse material) will go out from the outlet at the tail of trommel screen. 1. The material motion states of common trommel screen can be divided into three types. 1) The state of sink down In this state, the rotation speed of machine is very low. Due to circular motion, the material tumbles above the upward-moving particles. In this case, the material mixing is inadequacy, which makes it difficult that in-between fine material tumbles and moves towards the screen cloth, leading to extremely low screening efficiency. 2) The state of throw down When the rotational speed of trommel screen is high enough but lower than critical speed, the material will overcome the gravity and move upwards up to the highest point of revolving drum. In this case, the gravity exceeds the centrifugal force, the material drops along the parabolic trajectory and comes back to the bottom of revolving drum. Since particle tumbling is the most vigorous in this case and material accumulation phenomenon rarely occurs, so the screening efficiency is the best. 3) Centrifugal state When the rotational speed of trommel screen increases up to critical speed, the material will be attached to the cylinder wall and can't tumble and drop, so the screening efficiency becomes very low. 2. The design of municipal solid waste trommel screen is improved on the basis of common equipment, adding the structure of some sorting or cleaning, which makes the machine more suitable for municipal solid waste screening. The motion of municipal solid waste in the machine is divided into two types. 1) The motion along the axis direction of screen body The rectilinear movement along axial direction is generated from the slanting installation of screen body, its velocity is the speed of waste passing through the screen body. 2) Planar motion perpendicular to axial plane of screen body This planar motion is closely related to the rotational speed of screen body. When the screen body rotates at the velocity that lower than critical speed, the waste moves to a certain height and makes parabolic falling, which benefits the screening. The rotational speed is generally 30% ~ 60% of critical speed. PK Machinery is a professional manufacturer of vibrating screen, screw conveyor, belt conveyor, bucket elevator and scraper conveyor, further information, please click: www.pkmachinery.com.
Our Trommels are firmly constructed with carbon tool steel, designed for high performance, high production rates, lower operating costs and lower maintenance. Customized trommel screens are provided to meet specific requirement on product and to comply with the particle size, specific gravity, dryness and viscosity of screening materials.
Material feeds into the drum, is lifted up by the rotation and aerated as it falls back down. This action is repeated with each revolution along the length of the drum. The screening materials can therefore tumble continuously under the inertia so that an enduring screening effect is achieved. The finer material passes through the screen meshes while the larger material tumbles towards its eventual exit at the rear of the drum. This method of screening helps to reduce operating and investment cost and to increase product quality, while allowing rapid and large volume processing.
The Fong Chuan Trommel Screens have received a good feedback from the market and are now widely used in areas like soil, sand and gravel aggregate screening, sorting for recycling, incinerator residue segregation, solid waste processing, smelting by-product isolation, land reclamation industries and sorting of building materials for remanufacturing purpose.
Trommel screens different from traditional types are also manufactured to meet specific needs, e.g. octagon or hexagon trommel screen is mostly used for scrap metal recycling and waste industries; customized traditional round trommel screen is on the other hand ideal for rock scalping and washing as well as different sized debris, solid contaminants or useful material sorting from containers, topsoil, peat, compost, decomposed bark, concrete washout for waste recycling. The use of these Trommels is dependent upon the different requirements on products. The larger the angle of the trommel screen is (as in the case of a traditional one), the higher the rubbing ratio and the longer the rubbing time will be. On the other hand, the smaller the angle of the trommel screen is (as in the case of a hexagon trommel screen), the higher the tumbling height as well as the tumbling frequency will be.
The mesh of the sieve is carefully calculated and designed on the basis of the varied feeding granularity, specific gravity, dryness and viscosity of the screening materials. The screening applications on our machines prevent the blockage of the material and achieve optimum performance of size classification and increased throughput.
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.
If youre a trommel screen owner, you likely deal with a wide variety of material and weather conditions. That means youre also making adjustments to your trommel screen on a regular basis, to make sure your machine is running as efficiently as possible and that your fines and overs are where you want them to be. There are a lot of ways you can have your trommel set up and how you do that can make a big difference.
To help you configure the efficiency of your trommel screen and get the most out of the material that youre feeding it, there are four machine settings you can adjust: the angle, the drum speed, the hopper speed and mixing screen sizes. Lets go through each one.
The first parameter to check is your drums slope or angle and see if you need to either decrease or increase the angle. Lets say your angle is at five degrees. Decreasing the angle of the drum to four or three degrees can give the material more time to work through the screen. This can help the material have better separation, since it will be lifted and thrown more. The downside to this is if the material is wet, the mud might make it ball together and impact the screen. If this starts to happen, its usually better to let it run through the drum at a faster clip and separate it as best as you can.
The other option is to increase the drum angle. This usually reduces the number of times material hits the screen before it exits the drum. This may lower your output, but it can help keep the screens clean if the material is wet or muddy. The maximum angle you can lift it is seven degrees. Depending on the condition of your material, this may be the better option. Keep in mind that there is a point where the material can get too wet or stuck together and the best option might be to let it dry first.
I like to use a clock analogy to explain drum speed, explained Duwayne Bonhorst, a product specialist at Vermeer. For example, you could adjust the drum speed so it lifts the material up to 11 oclock and throws it to a four or six oclock position.
Going back to the clock analogy, you could reduce the speed so the material drops to six oclock, said Bonhorst. The downside is this can lower production and may increase spearing of the long material in the fines, but if the material is wet, reducing speed is one way to keep the screens open.
The third factor that you can adjust for efficiency is the hopper speed. Generally, a trommel is set up with a typical angle of five degrees and a drum speed of 18 rpm to 20 rpm. As it begins to screen, you want to pay close attention to what the material looks like as it travels down the drum and approaches the overs belt.
A slower hopper speed means that the fines material will likely be fully removed halfway or three-quarters of the way down the drum. As you slowly increase the hopper speed, the line of separation will move closer and closer to the overs conveyor belt. Youll know that youve increased it too much when you start to see fines coming out of the overs.
You can adjust the hopper speed and drum speed, all from the full-function remote. You can also preload your desired settings with the remote by pressing the auto start button. Take the remote with you into the loader and adjust the machine settings from there. Its designed for convenience and ease of use to help keep your operation running efficiently.
The final setting you can adjust for efficiency is your actual screens. One way to do this is to mix in slightly larger screens in the first quarter or half of the drum. Vermeer trommel screens are clamped on per section and are efficient to remove so you can customize how you want.
For example, say you want to add a set of 5/8-in (1.6-cm) screen sections to the first two portions of the drum and leave the rest of the drum at 1/2-in (1.3-cm) screens, said Ted Dirkx, recycling and forestry sales manager at Vermeer. As you watch the material gradually screen apart, most of the fines are being processed in the first half. By adding slightly larger screens, you can strike an optimal balance of productivity and quality by taking this route.
Your specific trommel screen settings will depend on your jobsite and the material youre processing, but these four parameters are a solid way to test your efficiency and find what works best for your operation.
Vermeer Corporation reserves the right to make changes in engineering, design and specifications; add improvements; or discontinue manufacturing at any time without notice or obligation. Equipment shown is for illustrative purposes only and may display optional accessories or components specific to their global region.
When youre ready for a new machine, you have the option of buying from a company with a dealer network or one that operates directly from the factory. Lets break down the differences of each to see how they compare and what the benefits are.
Project: Trommel Screen for Municipal solid waste sorting system in Malaysia Equipment Model: GTS2075 Material: Construction waste Customer: Sunway Construction Group
1.Material to be screened: ______ 2.Handling capacity:______t/h 3.Bulk Density: ______t/m3 4.Max. granule size of the feeding material: ______mm 5. How many segments of screen mesh in trommel screen 6.Mesh size of each segment screen mesh: ______mm 7.What equipment is used to feed the material into the trommel screen:______ 8.Do the material after screened need to be transported by belt conveyor?______ (Yes or No) 9.Electric power supply:______V______HZ 10.Does the trommel screen work alone or with other equipment to form a system? If forming a system, do you have reliminary design or hand-drawn sketch? If havePlease send it to our engineer for reference.
The shaftless trommel screen drum unit is mounted on the frame at an angle and is designed without a central shaft structure. The motor drives the pinion gear to rotate with the large gear of the drum or the chain and the gear on the drum. The motor drives the chain drive or the roller is placed on the two rollers, and the motor drives the roller to drive. The roller device rotates under the driving of the driving device. After the material enters the roller device, due to the tilting and rotation of the roller device, the material on the screen surface is turned over and rolled, so that the qualified material (the product under the sieve) passes through the bottom of the rear end of the roller. The material is discharged, and the unqualified material (the product on the screen) is discharged through the discharge port at the tail of the drum. Due to the turning and rolling of the material in the drum, the material stuck in the screen hole can be ejected to prevent the screen hole from being clogged. Application of trommel screen The shaftless drum screen is mainly used for grading treatment of strip-shaped and entangled materials and is widely used in electric power, mining, metallurgy, building materials, chemical and other production industries. It is often used for the classification of refractory materials, coal, fertilizer, sand field stones, as well as the screening of sticky materials such as coal, coke, white ash, gold deposits, etc., to make the product structure more even to meet the production needs. Advantages Compared with the drum screen with the central shaft, the shaftless drum screen has a simpler structure. At the end of the drum screen close to the vibration motor, several steel bars are evenly welded around the drum, and the other end of the steel bar is gathered to the drum. On the central axis, after the fixing, the vibration motor is connected through the gear. When the vibration motor is started, the drum is also rotated, and the same screening principle as the roller screen of the shaft is used. The shaftless drum screen is relatively more material-saving, and the space for screening the material is larger. It is also easier to repair when the drum fails, so the use of the shaftless screen is also very much. For example, it can be used for pre-treatment of domestic garbage. It can filter out the required garbage. The advantage of no shaft is that it can avoid the entanglement of materials and the screening efficiency is relatively high.
The shaftless trommel screen drum unit is mounted on the frame at an angle and is designed without a central shaft structure. The motor drives the pinion gear to rotate with the large gear of the drum or the chain and the gear on the drum. The motor drives the chain drive or the roller is placed on the two rollers, and the motor drives the roller to drive. The roller device rotates under the driving of the driving device. After the material enters the roller device, due to the tilting and rotation of the roller device, the material on the screen surface is turned over and rolled, so that the qualified material (the product under the sieve) passes through the bottom of the rear end of the roller. The material is discharged, and the unqualified material (the product on the screen) is discharged through the discharge port at the tail of the drum. Due to the turning and rolling of the material in the drum, the material stuck in the screen hole can be ejected to prevent the screen hole from being clogged.
The shaftless drum screen is mainly used for grading treatment of strip-shaped and entangled materials and is widely used in electric power, mining, metallurgy, building materials, chemical and other production industries. It is often used for the classification of refractory materials, coal, fertilizer, sand field stones, as well as the screening of sticky materials such as coal, coke, white ash, gold deposits, etc., to make the product structure more even to meet the production needs.
Compared with the drum screen with the central shaft, the shaftless drum screen has a simpler structure. At the end of the drum screen close to the vibration motor, several steel bars are evenly welded around the drum, and the other end of the steel bar is gathered to the drum. On the central axis, after the fixing, the vibration motor is connected through the gear. When the vibration motor is started, the drum is also rotated, and the same screening principle as the roller screen of the shaft is used. The shaftless drum screen is relatively more material-saving, and the space for screening the material is larger. It is also easier to repair when the drum fails, so the use of the shaftless screen is also very much. For example, it can be used for pre-treatment of domestic garbage. It can filter out the required garbage. The advantage of no shaft is that it can avoid the entanglement of materials and the screening efficiency is relatively high.
The shaftless trommel screen is mainly used for grading treatment of belt-shaped and entangled materials. It is used for the classification of refractory materials, coal, fertilizer, sand field stones, and the selection of coal, coke, white ash, placer gold, and other viscous materials to make the product structure more uniform to meet the production needs. Shaftless trommel screens are relatively
At present, the screening tools are mainly divided into fixed screen, rotary screen, vibrating screen and swing screen. Which screener is suit for domestic waste separation? Domestic waste refers to solid waste generated in daily life or activities that provide services for urban daily life, as well as solid waste that is regarded as urban domestic waste by laws and
The gold washing trommel screen is very efficient in quickly screening large quantities of materials. In areas with high clay content, this sieve is also an essential gold mining tool. Gold, silver, lead zinc, tantalum-niobium, tin, and other rare and precious metal ores. Trommel screen structure The shaftless drum screen machine is mainly composed of motor, reducer, roller device, frame,
The shaftless trommel screen is suitable for sieving stone, sand, the garbage of various properties, and damp and easily clogged materials. The product under the sieve is 200mm, the middle is 20-40mm, and the thickness can be less than 5mm, with a self-cleaning device. The transmission mode is divided into three types: large and small gear transmission, sprocket chain transmission,
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.
Humdinger Equipment is partnering with Tana to make a Humdinger brand of trommel screen that will partner the best of both companies to serve the American market in the best way possible. Always keeping in mind that everything we do is designed to improve your bottom line
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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.