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.
trommel screen for various materials | fote machinery
The trommel screen is a new type of self-cleaning screen. It is widely used for screening all kinds of solid materials, such as stone (granite, cobblestone, basalt, etc.), coal, coke, white ash, compound fertilizer, topsoil, sand, municipal solid waste, aggregates, etc.
The capacity of the trommel screen is closely related to the screen size. If you choose a 2 mm sieve, the output is 12-35 m/h (19.2-56 t/h); its output can reach 175 m/h (280 t/h) with a larger sieve (30 mm), which can meet the requirements of large-scale production.
When the materials are fed into the tilted and rotating barrel, they turn and roll on the screen. Then the qualified materials (undersize product) are discharged through the outlet at the bottom of the rear end of the barrel, while unqualified materials (oversize product) are discharged through the discharging port at the end of the barrel.
The bearing bears the full load of the trommel drum machine. Good lubrication has a great relationship with the bearing life, directly affecting the service life and operation rate of the machine.
The discharge port is often blocked, so it is recommended that its angle should be as perpendicular to the ground as possible and the diameter should be larger to facilitate the discharging of materials.
2 High screening efficiency. The sand lump breaking device in the trommel drum can break up the clumps of sand. The cleaning device installed on the trommel screen can clean up the adhered sand by itself to prevent the mesh plugging.
6 Easy to install, disassemble and transfer. Because the whole equipment is a box-shaped frame structure, only flat ground is required. The high integrity of the equipment is convenient for storage or transfer on the construction site.
The magnetic separation production adopts a two-stage grinding process, in addition to the good screening effect of the trommel screen, which not only reduces the ore sludge caused by the mineral over-grinding and low grinding efficiency, but also increases the output and achieves the required grinding fineness.
Three magnetic separators are adopted for selection. One magnetic separator is used for the first stage, another for rough concentration and the third for concentration in the second stage to achieve the requirement of concentrate grade above 63.
Because the quartz sand is in the form of mineral particles, the mineral powder smaller than the sieve hole will fall during the continuous rolling of the trommel, while the other will be distinguished according to the diameter.
As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.
Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.
trommel screen work | henan deya machinery co., ltd
Materials are sent into the drum by the hopper, they are lifted up by the rotation and aerated as they fall back down. This action is repeated with each revolution along the length of the drum. The finer materials pass through the screen openings while the larger materials tumble towards their eventual exit at the rear of the drum.
trommel screen | ldhb
LDHB trommel screen is a screen that is curved into a cylinder. These trommel screens are also referred to as trommel drums or drum screeners. They are usually used to separate different grades of material such as soil, gravel, mulch, and sand by size.The trommel screen mainly consists of motor, reducer, drum device, frame, sealing cover and inlet and outlet.
When trommel screens working, raw feed materials are picked up by the drum screens until it near drum top. Material then falls back down to the bottom of the drum by gravity. As it tumbles, the softer fractions broken down. The process repeat, smaller size materials pass throuth the screens while the larger size material pass through the opposite end outlet of the trommel drum,achieve accurate sizing and separation.
1. Adopting rolling conveying, the friction coefficient is small, and the sieve hole is not easy to clog.
2. The drum support adopts integral through-shaft structure, which runs smoothly, does not vibrate and has low noise.
3. The internal drum screen fittings are designed separately, which is simple in structure and convenient in replacement and maintenance.
4. The drum body adopts an effective fully sealed structure, without dust and pollution.
5. Safe and reliable operation, adopting deceleration drive, high transmission efficiency.
6. Customized screen, high screening efficiency, long service life and low maintenance cost.
7.Equipped with sprayer, proficient in both wet and dry applications.
trommel screens 101
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.