The trommel screen 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 finer material passes through the screen openings while the larger material tumbles towards its eventual exit at the rear of the drum.
The screen drum of a conventional drum screen is supported by 4 rollers. During work, two active rollers on one side of the cylinder are driven by the motor and reducer to rotate. Depending on the friction, the active rollers drive the cylinder to rotate, while the two rollers on the other side play a slave role. The inclination angle of the drum sieve will affect the residence time of the waste material in the sieve drum. It is generally considered that the inclination angle of the drum sieve drum is in the range of 2 -5 . The material to be screened enters the barrel from one end (feeding hopper) of the barrel. Due to the rotation of the barrel, the material slides along the inner wall of the barrel.Fine material smaller than the screen hole of the cylinder falls into the receiving tank, while coarse material larger than the screen hole of the cylinder is discharged from the other end of the cylinder.
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Trommels are used in a wide spectrum of applications in order to separate the organic material in urban and packaging treatment plants, not only to eliminate the voluminous material but also to separate inert material in compost refine plants.
Bianna Recycling offers a wide range of trommels with different diameters, screening lengths and plate thickness, depending on the equipment application: simple / double trommels for urban treatment plants, refine trommels, trommels for construction and demolition waste treatment facilities, etc.
01 Protections an sheet upper covering 02 Screening drum: sheet thickness (from 6 to 15 mm). Mesh size according to the screening request. 03 Wearing resistance wheels 04 Guide wheel 05 Gearmotor 06 Drum 07 Support strut 08 Access door to the inside of the equipment 09 Inspection window 10 Maintenance platforms 11 Access stairway 12 Anti-strip system (optional) 13 Bag-opening teeth 14 Exchangeable screening sheets.
Our trommels, sold worldwide for more than 25 years, guarantee our equipment efficiency and durability. They are distinguished by the fact they have security systems installed and all the access to the inside of the trommel are specifically designed to guarantee the cleaning and maintenance work to be as practical and fast as possible.
Equipment characterized by its robustness and wear resistance in demolition plants. Working with such waste is no easy task, so Bianna Recycling has designed very rugged equipments which are able to withstand the wear and abrasion this kind of waste involve.
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.
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.
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Mining trommel screen is screening equipment developed for power plants, coking plants, building materials, metallurgy, chemical industry, mining, and other industries with large processing capacity, high screening efficiency and no plugging. Trommel screen overcomes the circular vibrating screen. And the linear vibrating screen has the problem of screen blockage when screening wet materials, which improves the output and reliability of the screening system. Mine drum screen working principle Australia high quality trommel screen parameters After the broken stone enters the drum, the material is sieved by the centrifugal force of the rotation of the drum and the elimination effect. The stone with large grain size flows forward along with the inclination of the drum and is gradually screened out through the screen of different meshes, and the granularity is not large. After the stone material is sieved out, it falls into the respective funnels. The materials are screened out one by one through different mesh screens and then dropped into the belt conveyor through the funnel and sent to the finished material yard. Trommel screen for occasions: 1. Stone yard For the classification of large and small stones, and can separate the soil and stone powder. 2. Sand and gravel field for sand and stone separation. 3. Coal industry for the separation of lump coal and coal powder and coal washing (part of coal washing machinery) 4. Chemical industry Mineral processing industry For the classification of large and small blocks and separation of powdery substances
Mining trommel screen is screening equipment developed for power plants, coking plants, building materials, metallurgy, chemical industry, mining, and other industries with large processing capacity, high screening efficiency and no plugging. Trommel screen overcomes the circular vibrating screen. And the linear vibrating screen has the problem of screen blockage when screening wet materials, which improves the output and reliability of the screening system. Mine drum screen working principle
After the broken stone enters the drum, the material is sieved by the centrifugal force of the rotation of the drum and the elimination effect. The stone with large grain size flows forward along with the inclination of the drum and is gradually screened out through the screen of different meshes, and the granularity is not large. After the stone material is sieved out, it falls into the respective funnels. The materials are screened out one by one through different mesh screens and then dropped into the belt conveyor through the funnel and sent to the finished material yard.
Trommel screen for occasions: 1. Stone yard For the classification of large and small stones, and can separate the soil and stone powder. 2. Sand and gravel field for sand and stone separation. 3. Coal industry for the separation of lump coal and coal powder and coal washing (part of coal washing machinery) 4. Chemical industry Mineral processing industry For the classification of large and small blocks and separation of powdery substances