trommel screen not working

trommel screen maintenance and troubleshooting | lzzg

trommel screen maintenance and troubleshooting | lzzg

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 more material-saving and have more room for screening materials. It is also easier to overhaul when the drum fails, so shaftless drum screens are also used very much. For example, it is used for pre-treatment of domestic garbage. It can screen out the required garbage. The advantage of shaftless is that it can avoid the entanglement of materials and the screening efficiency is relatively high. Operation and maintenance The trommel screen is reliable in operation and low in maintenance. The following points should be briefly noted during operation: 1. The drum screen must be turned on first, and then the feeding equipment should be turned on; the opposite is true when parking; 2. Before running, the fasteners of the drum screen should be inspected, and if loose, they should be fastened in time. In the future, the drum screen fasteners can be inspected and processed regularly (weekly or half-monthly); 3. The bearing seat and gearbox should be regularly checked for lubrication, and refueled and changed in time. The large shaft bearing adopts No. 2 lithium-based grease. Under normal circumstances, replenish the grease once every two months. The replenishment amount should not be too much, otherwise it will easily cause the bearing to overheat. Bearings should be cleaned and inspected once a year. 4. When the equipment is shut down for a long period of time (more than 30 days), the motor insulation should be shake-tested to avoid burning the motor. General troubleshooting Noise problems caused by loose bolts of trommel screen Solution: Re-tighten bolts or other fasteners; Wrong direction of rotation caused by wrong power cable connection of drum screen motor Solution: replace the power cable in the junction box; Click start delay problem caused by overload of drum screen motor or excessive delivery volume Solution: readjust the delivery volume; Inadequate ventilation or lack of lubricant in the drum screen box makes the gear box generate heat Solution: Check and adjust the heat dissipation of the vent and add lubricant; Drum screen motor heating problem Solution: 1. Reduce the load; 2. Tighten the connection; 3. Reconnect after checking. 4. Clean the heat sink of the motor; 5. Check whether the impeller of the drum screen fan is working properly to ensure smooth air circulation; Clogged screen holes prevent the drum screen from operating normally Solution: Clear the clogged garbage in time to reduce clogging.

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 more material-saving and have more room for screening materials. It is also easier to overhaul when the drum fails, so shaftless drum screens are also used very much. For example, it is used for pre-treatment of domestic garbage. It can screen out the required garbage. The advantage of shaftless is that it can avoid the entanglement of materials and the screening efficiency is relatively high.

Operation and maintenance The trommel screen is reliable in operation and low in maintenance. The following points should be briefly noted during operation: 1. The drum screen must be turned on first, and then the feeding equipment should be turned on; the opposite is true when parking; 2. Before running, the fasteners of the drum screen should be inspected, and if loose, they should be fastened in time. In the future, the drum screen fasteners can be inspected and processed regularly (weekly or half-monthly); 3. The bearing seat and gearbox should be regularly checked for lubrication, and refueled and changed in time. The large shaft bearing adopts No. 2 lithium-based grease. Under normal circumstances, replenish the grease once every two months. The replenishment amount should not be too much, otherwise it will easily cause the bearing to overheat. Bearings should be cleaned and inspected once a year. 4. When the equipment is shut down for a long period of time (more than 30 days), the motor insulation should be shake-tested to avoid burning the motor.

Drum screen motor heating problem Solution: 1. Reduce the load; 2. Tighten the connection; 3. Reconnect after checking. 4. Clean the heat sink of the motor; 5. Check whether the impeller of the drum screen fan is working properly to ensure smooth air circulation;

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 spiral classifier is used in the artificial sand production line and the commonly used classification equipment in the washing operation. It is mainly used to wash off the mud powder in the sand so that the artificial sand can reach the standard of construction sand. Some faults will inevitably occur during work and use. Here are some common fault

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,

how a trommel screen works

how a trommel screen works

People use screening equipment to separate different grades of material such as soil, gravel, mulch, and sand. These machines work great when they are working with dry material, even if bits and pieces are large in size. A notable weakness, however, is the difficulty that traditional screeners have with wet materials such as moist soil, wet sand, and compost. These substances tend to clump together when they are wet, which reduces the efficiency of the machine. In addition, moist material can clog up the machine and stick to the screen. This can be difficult to dislodge and will cost a lot of time. Fortunately, trommel screen sifters are available to make these tasks much simpler.

A trommel is a screen that is curved into a cylinder. The machine spins the cylindrical screen in order to sort through the material as it is fed through. During this process, the wet material tumbles around. Air is added and the soil, mulch, or sand becomes lighter and drier. The tumbling action also allows maximum contact time with the screen so that the fine material gets through quickly. A trommel screen can sort through dry substances quickly as well, even though it is designed with wet material specifically in mind.

These sifters come in different sizes, but in general they are portable enough to be moved by truck. This is very handy if you need to screen soil or mulch in more than one area of a homestead or if you need to move the machine to a different location entirely. Due to the materials that trommel screens specialize in, they are particularly popular with landscapers and excavating contractors. When things need to get done quickly, you cannot depend on your material being dry enough for a standard screening machine. Every handyman knows the importance of bringing the right tool for the job. The bigger the job, the more important the tool.

Cities can often find a lot of uses for screening machines. Trommel machines are particularly useful because they can handle a variety of tasks with speed. A quality screener pays for itself quickly when there are several tasks at hand. They are a beast that can take on a lot of work, but be sure not to overfill the machine. With a trommel, additional material beyond the designed capacity will only slow things down. The surface area of the screen is the limiting factor, so clogging the center of the rotary with more dirt or mulch will not accomplish anything. These machines are top notch quality, so it is important to remember that they should be allowed to work at their set pace. Even if there is a lot of labor to be done, the trommel will cut through it at a healthy speed, so let it run its course.

Like with many heavy duty machines, it is best to buy a trommel screen directly from a manufacturer. Far and away, this will get you the best price. By cutting out the middleman, you will also avoid all the overhead costs of a separate store and any salesman commissions. You pay the freight costs, but you would be indirectly paying for that anyway. The only issue with dealing directly with the manufacturer is that you need to do a bit of research. Luckily, the internet has made this issue all but disappear. Manufacturers that sell directly to customers have websites that explain the details of their products and provide informative videos and descriptions. By comparing different screeners and companies, you can find the highest quality machines at the best possible prices. If you are fairly good at performing online searches, the entire process will take less than an hour. If you need to sift and sort wet materials, purchasing a trommel machine straight from the manufacturer is the way to go.

I'm Al Skoropa and in 1996 I started EZ-Screen in Pontiac, Michigan to manufacture my first portable screening plant, the EZ-Screen 1000. Since then I've kept to my basic business philosophy of offering innovation, productivity, versatility and value through patented designs, exclusive features, quality manufacturing and outstanding customer service.

trommel screen maintenance manual | lzzg

trommel screen maintenance manual | lzzg

During the use process, the trommel screen runs slowly and evenly, with small impact vibration, stable operation and simple installation. It can be placed directly on a flat floor or floor and under the silo. The machine is easy to close and collect dust, has small maintenance, simple maintenance and long service life. Trommel screens are equipment commonly used in refractory materials, coal, river sand classification, and sand block classification. Do a good job of equipment maintenance to keep the drum screen in a good working condition and delay the service life of the equipment. watch trommel screen working videos Trommel screen maintenance Use the drum screen to do the part of the equipment reducer and support the lubrication of the bearing parts. The grease used in the roller screen bearing part is calcium-based grease, and the lubrication of the reducer part is periodically lubricated with 45# oil. The drum screen should be filled with grease before it leaves the factory. The user determines the lubrication cycle based on the specific operating conditions. The machine body has two lubrication parts, which are on the bearing block at the head and tail.It is strictly forbidden to make adjustments when the equipment is running, so as to avoid dangerous accidents. [1] Trommel screen should be maintained by personnel trained in equipment. [2] Equipment maintenance and repair must be carried out after parking. [3] Equipment management, maintenance personnel should always patrol the operation of the equipment, for example: whether the fasteners are reliable, whether the rotation is flexible or not. The dirt from the equipment blockage mechanism must be cleaned after the shift. [4] The machine can be evenly fed after normal operation. Under normal working conditions, the temperature rise of the bearing should not exceed 40 degrees Celsius. The highest temperature rise should not exceed 70 degrees Celsius. When the temperature exceeds the above temperature, stop immediately, and find out the cause and eliminate the fault in time. Before stopping, the feeding should be stopped first, and the motor should be turned off after the material in the drum screen is completely discharged. [5] After the drum screen has been running for a period of time, the dust cover must be opened to check whether the screen is damaged. If it is damaged, it needs to be repaired or replaced with a new screen, otherwise it will affect the product quality. Features of lzzg trommel screens The screen hole is not easy to block. Running smoothly and the noise is low. The structure is simple and the maintenance is convenient. The trommel drum cylinder can be closed, and easy to collect dust. Various plate and mesh sizes Screen drums made to customer specification.

During the use process, the trommel screen runs slowly and evenly, with small impact vibration, stable operation and simple installation. It can be placed directly on a flat floor or floor and under the silo. The machine is easy to close and collect dust, has small maintenance, simple maintenance and long service life. Trommel screens are equipment commonly used in refractory materials, coal, river sand classification, and sand block classification. Do a good job of equipment maintenance to keep the drum screen in a good working condition and delay the service life of the equipment.

Use the drum screen to do the part of the equipment reducer and support the lubrication of the bearing parts. The grease used in the roller screen bearing part is calcium-based grease, and the lubrication of the reducer part is periodically lubricated with 45# oil. The drum screen should be filled with grease before it leaves the factory. The user determines the lubrication cycle based on the specific operating conditions. The machine body has two lubrication parts, which are on the bearing block at the head and tail.It is strictly forbidden to make adjustments when the equipment is running, so as to avoid dangerous accidents.

[1] Trommel screen should be maintained by personnel trained in equipment. [2] Equipment maintenance and repair must be carried out after parking. [3] Equipment management, maintenance personnel should always patrol the operation of the equipment, for example: whether the fasteners are reliable, whether the rotation is flexible or not. The dirt from the equipment blockage mechanism must be cleaned after the shift. [4] The machine can be evenly fed after normal operation. Under normal working conditions, the temperature rise of the bearing should not exceed 40 degrees Celsius. The highest temperature rise should not exceed 70 degrees Celsius. When the temperature exceeds the above temperature, stop immediately, and find out the cause and eliminate the fault in time. Before stopping, the feeding should be stopped first, and the motor should be turned off after the material in the drum screen is completely discharged. [5] After the drum screen has been running for a period of time, the dust cover must be opened to check whether the screen is damaged. If it is damaged, it needs to be repaired or replaced with a new screen, otherwise it will affect the product quality.

The screen hole is not easy to block. Running smoothly and the noise is low. The structure is simple and the maintenance is convenient. The trommel drum cylinder can be closed, and easy to collect dust. Various plate and mesh sizes Screen drums made to customer specification.

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,

trommel screen vs vibrating screen, which is better? - jxsc machine

trommel screen vs vibrating screen, which is better? - jxsc machine

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.

disadvantages of trommel screens | aggregates equipment, inc

disadvantages of trommel screens | aggregates equipment, inc

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.

what is trommel screen and how does trommel screen work | m&c

what is trommel screen and how does trommel screen work | m&c

Trommel screen, or rotary screen, is a kind of mechanical screening machine which is widely used in the separation operation. It controls the material separation by the particle size, and the separation precision is high. The cylinder of the trommel screen is generally divided into several sections, depending on the specific situation. The mesh holes are arranged from small to large, and the mesh hole diameter on each section is the same.

When the material enters the drum screen, due to the inclination and rotation of the roller device, the material on the screen surface will turn over and roll, so that the qualified material will be discharged through the outlet at the bottom of the drum, and the unqualified material will be discharged through the outlet at the end of drum.

1. It is used for sand screening in sand plant; 2. Used as sand screening machine to screen sand and stone; 3. Used as gold washing equipment for screening and cleaning sand, stone and gold; 4. Used for screening mineral materials in gold boat.

common troubles and troubleshooting methods of trommel screen

common troubles and troubleshooting methods of trommel screen

Only select, use trammel screen correctly and make sure the routine maintenance, can make the trammel screen work effectively, and achieved good results process. Now I will show you some knowledge about common troubles and troubleshooting of Trommel screen. 1. The trommel screen screening quality is not good screening quality, the reason may be sieve clogged, sieve should be cleaned regularly; if the reason is screen surface damaged, just replace the screen surface; when the material moisture is higher, oversize is too thick, When it serious impact the screening process, you can considered increase the mesh to improve screening efficiency; 2. When the rotation rate of the trommel screen is not enough, mainly because the transfer belt is too loose, you should adjust the tightness of the transfer belt promptly, belt too tight or too loose will cause the belt easily shorten the service life of the trommel screen; 3. Bearing lack of oil, if the bearing working a long time without cleaning, can make bearing heating, bearings should be cleaned regularly, replace the seals, check the bearing greasing or oil quality meets the requirements; if the bearing wear seriously youd better replace the bearings; 4. The shaft of trommel screen cannot turn up, check whether the seal sleeve is plugged, if so you just need clean up the sleeve; 5. The trommel screen gives out abnormal sounds during the operation, you should stop it immediately, check the screen tension, the bearing degree of wear, whether the bolted is loose and whether the spring is damaged. I hope after this description can help you learn something about trommel screen.

sizing a trommel screen how to choose the right machine

sizing a trommel screen how to choose the right machine

According to Duwayne Bonhorst, product specialist at Vermeer, production rates can be affected by machine design. Trommel screens are engineered to size material, he explained. Smaller material (fines) falls through the screen, while larger material (overs) gets pushed out the back. Along with facility location and the type of material being processed, the machine design is just as important as its size when it comes to swapping out screens or drums and performing routine maintenance.

To begin choosing the right size trommel screen for your operation, Bonhorst recommends looking at the screen size. Most operations are looking for screens between a 1/8 inch to 3 inches (.3 cm to 7.6 cm), and production rates can vary greatly depending on size selected, he said. Smaller screens produce more fine material for reselling. A company that is producing soil will have substantially more overs than if they are producing mulch and require a lot more material to be run through the screen to amass the same volume of material.

Thinking about where your trommel screen will be working is also essential for selecting the right model. Some models will have conveyers off to the side while others are designed with conveyers only off the front and back. Space becomes a factor for companies with smaller yards, which is pretty common when working in an urban environment, Bonhorst explains. For these locations, a trommel screen with a conveyer out to the side, like the Vermeer TR6400 trommel screen, may be a better fit. For similar production rates on larger, more open yards, the Vermeer TR626 trommel screen should also be considered.

Hopper height and size along with the ability to adjust as needed, are crucial to how efficiently a trommel screen will run, explained Bonhorst. The size of the hopper dictates how much material can be added at a time, but the hoppers height will impact cycle times, setup time and spillage when adding material. When working with lower hopper heights, like those found on Vermeer trommel screens, operators arent having to raise their buckets as high. This can help keep cycle times short as well as reduce the chance of materials spilling. With a lower hopper height, the ramp to feed the machine does not have to be built, which can also save time during site setup.

Next, you need to consider how to make performance adjustments to the trommel screen. Vermeer trommel screens feature the Vermeer DP10 display, which allows operators to make adjustments from a control panel on the side or from a handheld transceiver remote that can be used in the cab of a wheel loader.

According to Bonhorst, you should also think about serviceability. Weve designed Vermeer trommel screens to give operators and service technicians full-length access to the drum, making it possible to perform routine service work from the ground level, he explained.

It is important for your trommel screen to have the ability to be customized for any unique needs you have based on things like local regulations or material types. For example, some cities may have strict dust regulations, so you may need to add a dust cover to help keep dust levels down. Or if youre working with wet material a lot, an extra set of brushes can help reduce the amount of time you spend cleaning screens. If youre working with a Vermeer dealer, they can help you understand what optional accessories are available for a particular trommel screen and get you set up with what you need.

Finally, when youre shopping for a trommel screen, who you choose to do business with matters a lot. A trommel screen is likely not the only piece of equipment in your fleet. So, its crucial to select a dealer and manufacturer who understand your industry and can help you operate as efficiently as possible through every step of your production process. Vermeer and your local Vermeer Recycling and Forestry specialist can answer any questions you may have when choosing a trommel screen or any other related matters. They can also help you dial in your operation and help with any of your service needs.

For more than six decades, Vermeer has been making an impact by providing agricultural and industrial equipment that is built tough, built to perform, built for value and backed by caring customer service. But our impact doesnt stop there. It goes far beyond the high-quality of our yellow iron. Thats just our starting point. Today, we are an industrial ...

trommel working principles - grinding & classification circuits - metallurgist & mineral processing engineer

trommel working principles - grinding & classification circuits - metallurgist & mineral processing engineer

Trommels are best used as a scalping device to remove large/oversize pieces from a stream, when these particles are a small percentage of the stream. They are not very efficient as compared to regular screens, but they also beak up clumps of material,

If you refer to trommel screens or drum screens then there are quite a few options , The Rota spiral screen is a rotary drum screen with build in spiral to remove oversize fast , can cut as low as 80 - 100 micron and could scalp Cyclone overflow , or remove the undersize from mill feed if installed on Cyclone underflow ,and so reducing gold recycling back to the mill and gold lock up .

If the efficiency is concerned the design (diameter, length, single or double decks) must be correct depending on the application and suitable to the material. The screen opening size is also very important and water addition if required. Care must be taken to control the wear to avoid the running at very large screen opening size than recommended.

The trommel screen is like a micron screen, it remove large objects (oversize, bushes, plants, rocks) from feed from the mine to avoid choked feed pipes and or plant instability, and the (undersize/micron size feed) moves through the plant for processing.

Basically its starts with your trammel feed from the mine enters the trommel and then separation take place, finer minerals from courser minerals... the finer feed minerals go to plant processing throughput and courser to the extendable/tailings/waste. The trommel has to do with width, microns, diameter, length, size.

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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.

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