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vibrating screen for screening material

good vibrations: thyssenkrupp goovi a revolution in screening technology | bulk-blog

good vibrations: thyssenkrupp goovi a revolution in screening technology | bulk-blog

By P. Berlitz, A. Greune goovi, thyssenkrupps innovative multiple vibrating screen, generates good vibrations! It is revolutionizing screening technology thanks to an innovative, patented drive system and a host of intelligent detail solutions, maximizing screening efficiency and flexibility along with substantially reduced weights, heights and drive ratings.

Screening plays a key role in mineral processing in the quarrying industry, ore and coal preparation as well as in the recycling sector. This applies especially in comminution, where only screening enables qualified, accurately sized material to be obtained from crushed material, ready for further processing or sale in this state.

Traditional vibrating screens are either driven by eccentric shafts or vibrated by unbalanced weights and, depending on the mode of vibration, classified into circular-motion vibrating screens, linear-motion vibrating screens and elliptical-motion vibrating screens. Characteristic of all these is that the oscillating driving forces are introduced through the machines centre of gravity and the screens are supported at the front and rear in the conveying direction (Table 1). On account of this, the screen trays must be designed to be especially rigid and heavy, in order to permanently withstand the resulting high dynamic loads.

In an assessment of the advantages and disadvantages of the aforementioned screen types, the limited flexibility regarding the operating parameters proves a disadvantage as this makes it impossible to react to changes in the required product quality or to changes in the properties of the feed material. Such modifications can usually only be done mechanically, leading to unscheduled downtime and potentially multiple corrections.

Moreover, synchronization of the drives either fixed on both sides of the screen box (circular-motion vibrating screen) or installed centrally above or below the screening area (linear-motion vibrating screen) is mechanically complex, heavy, and prone to wear as well as requiring lubrication equipment. Especially in case of circular screens, these mechanisms lead to limitations in the design of the screen width, so accordingly only limited throughput rates can be realized.

The considerable space requirement and the high weight of common screen models have repeatedly turned out to be the most prominent drawbacks of common screen types. These characteristics not only affect the screen itself, but lead to high transport and assembly costs as well as having an adverse effect on the structural design environment of the screen and the drive power to be installed. Large and heavy screens require a corresponding substructure and suitable building structures as well as to, for example, longer belt conveyors for the supply of feed material. The higher the weight of the screen trays that have to be driven, the higher, of course, is also the screens energy consumption.

On account of the process-related low height of the material bed on the screening area, an unfavourable ratio of screen feed to the vibrating mass results, especially in fine screening. In the screen shown in the Fig. 1, with a width of 4.3 m and a weight of 35 t for screening phosphate, during normal operation, for example, only 300 kg material can be found on the screen deck.

Having considered the observations mentioned above, thyssenkrupp has developed a large number of innovative, intelligent solutions to design screens to be more effective, flexible and economic. The result is the new goovi multiple vibration screen.

In the development of the new goovi, the thyssenkrupp specialists initially concentrated on secondary and tertiary screening as here larger areas of application can be found in the field. These are applications in the gravel and aggregates supply sectors, in mining and recycling, where feed materials with a particle size up to 80 mm are screened with a minimum screen cut of around 2 mm.

With regard to design, the focus of the new development was on the drive concept as this promised the greatest potential for optimization. But trailblazing developments have also been realized for the screen tray, screen support and the control system. Basically, the thyssenkrupp goovi has been designed for the digital quarry and paves the way for industry 4.0 in processing plants.

In the specification of the drive concept, the point of force introduction is of particular importance as this influences the static and dynamic sizing of the screens sidewalls. Simulations have shown that a screen should ideally be driven at four different points, on both sides in the front and rear areas. For this reason, it was decided to place the drives in the bending nodes of the stress curves in the sidewalls (Fig. 3). In this way, the forces are optimally transmitted into the sidewalls and bending stresses minimized.

At the same time, the drives should be designed to enable higher flexibility and easier adjustment of the operating parameters. For this reason, at every drive point, not only one motor but two or three motors were installed, so that each thyssenkrupp goovi is driven by 8 to 12 motors. Here, compact lifetime-lubricated standard unbalance motors are used, which are symmetrically flange-mounted to the sidewalls and synchronized by means of a patented PLC system supplied along with the screen.

But the PLC system is not only responsible for synchronizing the motors, it can also adjust them relative to each other during operation. When all the motors are turning in one direction, a circular motion is generated (Fig. 4); when the motors in one drive cluster turn in the opposite direction, the screen is vibrated in a linear motion. The PLC system can be used to switch the mode of vibration, without the need for any mechanical intervention. With a change of the eccentric weights of a drive cluster, an elliptical motion of the vibrating screen can be realized, with which the advantages of a circular- and linear-motion screen can be combined. The rotational speed and the angle of throw can be infinitely adjusted so that all important operating parameters can be optimally adapted to production requirements at all times.

Consequently, the goovi can be adapted to changing material properties that can result from variations in the material deposit or climatic influences, e. g. in form of increased moisture content. Even very difficult-to-screen materials can be optimally classified. Also with one and the same goovi, but with a change in the operating parameters and, if required, the screening surfaces, different products and product qualities can be obtained, if the market requirements change or, for example, vary seasonally. For this, specific recipes can be added to the control system and called up as needed. For high requirements on the product quality, e. g. in the aggregates industry, control loops can be realized in which screen parameters can be readjusted, if, for instance, there are changes in the product grading curve. Precondition for this is a reliable method for continuous determination and monitoring of the product grading curve.

Particles that clog up the screening surface and reduce screen efficiency can be easily removed thanks to the goovi self-cleaning function, with which the mode of vibration and direction of transport is changed temporarily. As a result, losses in efficiency and costly cleaning work can be reduced or avoided completely.

The entire drive system works without any mechanical transmission components like shafts or gears as the motors are flange-mounted directly to the screen wall and synchronized electronically. As a result, the maintenance requirement, the weight and the power consumption are reduced considerably. Lubrication is not at all necessary.

For the screen tray, too, the priority was a simple, but stable design, which is also easy to assemble. The sidewalls consist of standard sheets that can be fabricated in any size and quality in a laser-cutting process. In the lower section, they are connected by numerous cross beams (Fig. 3) consisting of standard tubes protected against wear with a polyurethane sleeve. In the upper section, just a few cross beams of the same type are sufficient to stabilize the screen tray. This bolted and clamped structure endows the screen tray with high durability. This effect is reinforced by the optimized position of the unbalance motors, which reduces the dynamic load in the sidewalls.

Moreover, the arrangement of the drives leads to a flat design of the goovi and enables easy installation in existing plants. It is basically possible to assemble the goovi at the installation site on account of its simple design and, in certain circumstances, this is even recommended as fully assembled screens do have a relatively large volume, which can make their transport expensive. With delivery of a compact construction kit, transport costs can be reduced substantially. In the case of particularly confined spaces, thanks to its very simple design and assembly, the goovi can be directly assembled in its intended position in the plant. Naturally, provision has been made to comply with the new requirements in the recently revised EN 1009 concerning the space required for maintenance of machinery for the mechanical processing of minerals.

The goovi is supplied with one or two screen decks. For these, a large number of screen surfaces and linings are available, which can consist of wire mesh, rubber or polyurethane as well as a combination of these. The screen has been designed for fitting common standard-size screen panels, which can be quickly and easily changed with little effort.

For the support of the screen tray, thyssenkrupp has also blazed a new trail. Unlike conventional screens, the goovi is not suspended on steel or rubber springs, but on air springs with variable pressure, which are fixed to extended cross beams in the lower part of the screen tray (Fig. 3). These offer some notable functional advantages.

For assembly, the screen is first placed on top of four rubber buffers (Fig. 3) before the air springs are inflated. With slight variation of the pressure in the air springs, the goovi can be optimally adjusted in height and the vibrating performance can be optimized. On account of the lower spring constant compared to steel or rubber springs, the dynamic foundation loads can be reduced significantly, which has a positive effect on the weight of the substructure. Another interesting aspect is the considerable reduction in the noise generated by this type of spring compared to conventional systems.

As described earlier, the control system of the fully digitalized goovi plays an important role. This is used to synchronize the motors and adjust the mode of vibration, the conveying speed and direction, in order to optimally adapt the machine to the application, especially for handling difficult-to-screen feed and changing material properties. The goovi is supplied with a complete switch cabinet; this is equipped with a touchscreen on which the operator can select different recipes (Fig. 5).

The recipes are configured either on site by thyssenkrupp service operatives or by means of teleservice. Other information, e. g. motor data or vibration monitoring, can be logged and, if necessary, evaluated by means of teleservice.

Following the development of a prototype and successful commissioning of the first goovi in a steelworks in Germany, thyssenkrupp has developed a standard model range, which is geared to the market requirements and reduces the cost and delivery times. The single- and double-deck variants are available in six different widths and four different lengths, with screening areas between 11 m and 26.4 m (Table 2).

Besides these standard screens, thanks to simple, modular design, individual, customized screens can also be supplied. For example, screening areas can be adapted to specific applications or the sidewall geometries and spring positions can be matched to the available space at a customers plant.

Particularly interesting is a comparison of the weights of the goovi with the weights of conventional screen models (Fig. 6). Here, the advantages of the new screen design are clearly shown. While the linear-motion vibrating screen has, as expected, a very high specific weight relative to the screening area, the goovi weighs in well below the relatively lightweight circular-motion vibrating screen. Especially for relatively large screening areas, the goovi weighs less than a half the weight of circular-motion vibrating screens. This trend also applies to the costs and is intensified thanks to the simple design and the small number of driven components.

With the overall design and many detail solutions, thyssenkrupp has developed a concept, which can certainly be described as revolutionary. Substantially reduced weights and heights are accompanied by a considerable increase in operational flexibility, product quality and performance, as a result of which the goovi creates real added value.

In the meantime, the first goovi has been in operation for several months and has proven optimally efficient for screening slag (Fig. 2). For different material properties, the screen is run with different settings and achieves the best results for the operator.

Acmon Systems is an engineering company with manufacturing excellence specializing in the field of Bulk material Handling solutions in a wide range of industry sectors. Acmon Systems is a member of Acmon Group, and thisvideo helps you understand Acmon Groups philosophy, actions, projects in 2 minutes! Continue reading

Bethlehem (PA), United States SMART ELBOWDeflection Elbow from HammerTekends formation of streamers, angel hair and snake skins by eliminating impact and frictional heat caused by conventional elbows conveying pelletized resins and compounds when pellets skid against the outside radius of the elbows creating friction and heat, melting pellet surfaces, forming streamers and causing downstream quality problems.

top 10 vibrating screens of 2021 | screening materials - rethinkrethought

top 10 vibrating screens of 2021 | screening materials - rethinkrethought

A vibrating screen is a machine made with a screening surface vibrated precisely at high speeds. It is utilized particularly for screening mineral, coal, or other fine dry materials. The screening execution is influenced essentially by different factors, for example, hardware limit and point of inclination, in which the performance can estimate by screening effectiveness and flux of the item. While this type of machine is doesnt use for DIY purposes, you may require this for industrial purposes. It is especially essential in the mineral processing industry. If you are considering buying one, check out this article and learn which vibrating screen machine may be perfect for you and your project.

Twofold vibrating engines drive a linear vibrating screen. At the point when the two vibrating engines are turning synchronously, and contrarily, the excitation power creates by the whimsical square counterbalances each other toward the path corresponding to the pivot of the engine. Then, it covers into a resultant power toward the path opposite to the hub of the engine. So, the movement becomes a straight line.

The elliptical vibrating screen is a vibrating screen with an elliptical movement track, which has the upsides of high proficiency, high screening precision, and a wide scope of use. Contrasted with the conventional strainer machine of similar detail, it has a bigger handling limit and higher screening productivity.

A circular vibrating screen is another sort of vibrating screen with a multi-layer screen and high proficiency. As per the kind of materials and the prerequisites of clients, you can use its multiple screening plates. it were introduced in the seat type. The alteration of the screen surface edge can acknowledge by changing the position and tallness of the spring support. This screen is used for mining, building materials, transportation, energy, chemical industry.

The working surface of the roller screen is made out of a progression of moving shafts that masterminded on a level plane, on which there are many screen plates. When working, the fine material goes through the hole between the roller or the screen plate. In this way, enormous squares of materials are driven by rollers, moving to the closures and releasing from the outlets. Roller screens are usually widely used in the conventional coal industry.

High frequency vibrating screen is likewise called a high-frequency screen for short. High frequency vibrating screen is made out of exciter, screen outline, supporting, suspension spring and screen, and so on. This type of vibrating screen is the most significant screening machine in the mineral preparing industry, which is reasonable for totally wet or dry crude materials.

Rotary vibrating screen principally utilize for the grouping of materials with high screening effectiveness and fine screening precision. It features a completely shut structure, no flying powder, no spillage of fluid, no obstructing of work, programmed release, no material stockpiling in the machine, no dead point of matrix structure, expanded screen territory, etc. Any molecule, powder, and bodily fluid can screen inside its specific range. The machine usually used for characterization, arrangement, and filtration in nourishment, substance, metal, mining, and some other ventures.

Horizontal screen has the benefits of both slanted screen and straight vibrating screen. The machine has the highlights of good screen penetrability, enormous handling limit, and small installed height. The establishment point of the regular vibrating screen is 15-30, while the establishment of a flat screen is corresponding to the ground, or somewhat slanted 0-5.

Heavy inclined screen can apply to the treatment of debris from the quarry, mine, and building destruction. It can also utilize in the treatment of topsoil, the reusing of development materials, the screening of rock, the screening of gravel and aggregates, etc.

Grizzly screen regularly utilizes for pre-screening before coarse and medium pulverizing of materials. The work size is by and large>50mm, yet some of the time <25mm. This machines productivity is low, but screen efficiency is not that high. Also, quite often, the mesh tends to get a block.

The banana screen has a screen plate with various areas and diverse plunge edges. The longitudinal segment is a broken line, while the entire screen resembles a banana shape. The banana screen is, for the most part, appropriate for the arrangement of huge and medium-sized materials with high substance of fine particles. It can likewise utilize for drying out and demoralization.

While you picking vibrating screens, the material qualities should consider, including the substance of material particles under the screen, the substance of troublesome screen particles, material dampness, the shape and explicit gravity of the material, and the substance of clay. Professional vibrating screens makers could give serious vibrating screen value, assorted variety redid vibrating screen models, auspicious after-deals administration, save parts, and can keep on offering types of assistance for clients entire creation circle.

what kind of vibrating screen is used for screening fragile materials | eversun,sieving machine

what kind of vibrating screen is used for screening fragile materials | eversun,sieving machine

For the screening of fragile materials, it is not only necessary to achieve a good screening effect, but the most important point is not to destroy the material itself. Traditional vibrating screens are easy to destroy the shape of materials due to the strong excitation force. For the screening of fragile materials, the EYBS tumbler screen developed by Eversun imitates the manual screening action, which simulates the effective principle of manual screening movement, and has a large output. The tumbler screening effect is remarkable for soft and hard materials and fragile materials. And its speed is slow and gentle, with low friction and will not harm the material itself.

Eversun machinery (Henan)Co,.Ltd was established in 2003, Eversun Machinery is a professional manufacturer of screening and conveying equipment, product quality system has been strictly certified by ISO9001:2005 and CE national standards.

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vibratory screens | mclanahan

vibratory screens | mclanahan

Screens can be considered the cashbox of the operation, because while crushersmake the gradation, screens make the specification. Material must go through or over a specified size to end up in the right pile. Unlike the crushers, Vibratory Screens cannot produce material; they can only size material that is already reduced to the product sizes. Vibratory Screens allow crushers to achieve maximum performance by sizing the material feed to the crusher and efficiently removing the finishing product from the circuit as it is produced.

Vibratory Screens can be subdivided into Inclined and Horizontal style screens. Today's screens come in widths from 4-12' wide and from 8-32' long. Screens are normally sized so that the length is 2.5 times the width. The width of a screen will determine the maximum carrying capacity of the screen deck, while the length of the screen will determine the overall efficiency of the deck.

McLanahan Vibratory Screens are engineered with ASTM A572 Grade 50 steel side plates. With a tensile strength of 65,300psi (65ksi), these side plates have a 45% higher yield strength than A-36 steel, which can withstand up to 36,000 psi (36ksi) of stress before it begins to drastically deform. A fully bolted construction reduces/eliminates cracking due to stress risers in the steel caused by welding. Worn components can be quickly replaced without cutting.

McLanahan Vibratory Screens are built with an integrated feed box and are able to withstand heavier loading and larger material in the feed end without worrying about bolts loosening or structural failure.

McLanahan Vibratory Screens feature robust side plate stiffening. Formed plates are bolted to side plates to form a rigid support grid along the length of the side sheet. Independent cross members can be pulled individually and relined in a clean work bay versus on a screen tower, and reduce the need for heavy and wear prone X-bracing. Cross members are on 4' centers to allow more clearance for personnel to access the decks. Replacement cross members come shorter in length and with machined/matched shims to allow for easy installation in areas with limited clearance.

Structural tubing gives the producer a variety of size options and allows you to replace only the worn tubes, not the complete deck frame. A sacrificial weld plate installed on top of the tubes allows stringers and bucker bars to be welded in without welding directly to the tube.

The performance of a screen is affected by four variables: eccentric throw, frequency (rpm), angle of adjustment and throw direction. By manipulating these variables, the operator can dial in the screen to match the application and material.

Eccentric ThrowEccentric throw is the radius of the screen box. Generally, the greater the throw, the more aggressive the screen action will be. Consequently, the smaller the throw, the less aggressive the screening action. Keeping this in mind, the operator can set up the operation with a heavy throw for heavier or larger materials, or a smaller throw to create a sifting action more suited for finer separations.

FrequencyThe frequency of the screen is measured in the number of revolutions per minute the screen makes. In conjunction with the eccentric throw, a lower frequency allows for a more aggressive screen action for larger material and cuts, while a higher frequency is used for smaller material and cuts.

Angle of AdjustmentThe angle of the screen plays a large factor in its overall performance as well. A flatter screen angle will provide a longer retention time of material on the deck and more probability that a particle will fall through the opening. As the angle is increased, the retention time is decreased.

ThrowIt may be advantageous to run the throw of the screen uphill. The goal is to increase the retention time on the screen, as well as change the orientation of the particles to the screen opening. The reverse action does not hurt the screen and is usually used in finer screening application, but be cautious not to increase the bed depth too much.

Stratification and SeparationTwo main operations have to occur for material to be screened: stratification and separation. Stratification is the process of larger sized material rising to the top of the bed, while smaller particles go to the bottom of the bed. Separation is the process by which particles introduced to the screen opening either fall through the opening or do not. Stratification must occur before separation can take place.

The separation probability is a function of the ratio between the size of the screen opening and the size of the particle. If the ratio is large in other words, the particle is much smaller than the opening there is a high probability the particle will fall through. If the ratio is small the particle is close in size to the opening then the probability is low that it will fall through.

Motion on a Vibratory Screen is produced with a combination of amplitude (stroke) and frequency (speed). The goal is to allow the particle to see as many openings as possible as it travels down the screen, but never see the same opening twice. Large screen openings for large cuts can be achieved with high amplitude and low speed. For small screen openings for finer cuts, the opposite is true: low amplitude and high speed.

Many producers have experienced a variety of problems that point to a screen deck that was improperly selected. It's wearing too fast. Its plugging (material getting stuck in the screen opening) or blinding (screen opening clogged by sticky material). The noise level is too high.

Many factors affect the overall efficiency of the screening process. Selecting the proper media for the application will be a big factor toward success. Wire cloth is the most widely used screen surface. Technological advances make it easier to consider other types of screen media.

The type of media chosen will depend on material abrasiveness, impact, material size, moisture content, cost-effectiveness and noise level. Wire cloth may be the lowest initial cost media, but the most cost-effective for anoperation will be the one that meets the specific application.

Rubber screens are a good choice for scalping decks in a dry, high-impact application. Rubber is very durable and can withstand the impact of the larger feed material hitting the deck. In a dry secondary application, a rubber screen can provide a long life, even in abrasive feed material.

what is vibrating screen mesh|types, specifications and application | quarrying & aggregates

what is vibrating screen mesh|types, specifications and application | quarrying & aggregates

The quarry vibrating screen is mainly used to screen gravel, and the quality of the screen mesh determines the material screening efficiency. Therefore, quarry investors or equipment purchasers will ask the manufacturer for information about vibrating screen media types when choosing a vibrating screen.

Rayco designs and manufactures a complete set of high quality and cost-effective rubber screens. They are used to treat the roughest and most abrasive products, such as gravel, coal, slag, etc. Rubber material is soft and powerful, can absorb shock and have long service life, which not only can reduce the downtime, but also makes installation easier and faster. If noise reduction is required, rubber screens are good choices.

Rayco rubber sieve can be divided into two kinds: tension and modular. The tension type can be installed as a circular vibrating screen and replace the original metal screen or polyurethane screen. The modular type can be installed in many ways, which can better save operating costs.

The polyurethane screen is made of polyurethane and embedded in a steel frame. It has a specially designed fastening hook to clamp the mesh to the separator. Polyurethane screen has excellent performance in mining crushing and aggregate screening industry. Different sizes and types of mesh hole ensure high screening efficiency and smooth surfaces. Polyurethane materials make mesh noise much lower than braided vibrating mesh or perforated mesh.

Our polyurethane screens can effectively screen materials for many industrial applications, such as dehydration, mining, sand, stone, gravel, etc. Polyurethane is ideal for high wear areas in both wet and dry processing applications.

THe high-strength woven wire screen is made of best steel wire like manganese steel wire, galvanized steel wire and stainless steel wire. The mesh hole can be square, rectangular, or longslotted. With a variety of woven types, it can be suitable for different screens and materials.

The perforated screen is made of a metal plate with high compressive strength after punching. Compared with woven vibrating screen, porous vibrating screen has a smooth surface, which can ensure higher screening and separation efficiency.

basic concepts of vibrating screens: what they are, what they are for and how they work. - rollier

basic concepts of vibrating screens: what they are, what they are for and how they work. - rollier

The screens serve to classify the different particles by size, starting from a bulk product in a continuous process. The inlet material (the raw product) advances from the part where the screen is fed to the opposite end in which the particles come out separately according to their size, shape or density. There are also vibrating screens that are loaded by the center and the product moves radially to the outputs that are on the periphery.

For the correct advancement of the product it is necessary that the process is continuous, and it is due to the vibration if the screening surface is horizontal. Most of the screens have a certain inclination in such a way that the advance movement of the product is due to a combination between gravity and vibration.

The screening elements are flat or slightly curved surfaces having perforations of a certain size such that when a product is poured in bulk on the element it only passes those particles whose size is smaller than the size of the perforations.

The screening elements can be a metallic or nylon wire mesh, bars that pass material between them, metal sheet with circular, square or hexagonal perforations, more or less rigid sheets of rubber or polyurethane with perforations.

A screen can have several screening elements on top of each other forming different floors. In this case, the floor with the larger perforations is placed in the upper part and successively in lower floors the elements with smaller and smaller perforations are mounted. In this way each particle is trapped between the floor that has cut points (openings) greater than the particle and the floor that has smaller cut points.

Traditionally there have been non-vibrating screens consisting of a fixed mesh with a lot of inclination. When introducing the vibration, the product shakes and the particles jump without sliding on the screening surface. Each jump is an attempt of the particle to pass through a hole and the probability of this happening is much greater if the machine vibrates. In other words, the effectiveness is much greater.

When a particle jumps and falls again it can do so in a hole or an area where there is no hole. If the screening element is a wire mesh, the particle can fall on the wire or on another particle and not squeeze through the hole it should. This is why no screen has an efficiency of 100% because it would require an infinite number of jumps so that all the smaller particles that the holes actually leak.

The more quantity of product you intend to classify, the more surface you need for screening. The most immediate symptom that a screen has become too small is that it decreases its effectiveness because it simply does not fit so many particles through the holes.

As a general rule for large classifications, low frequencies and large vibration amplitudes are preferable and for fine classifications high frequencies and small amplitudes. In other words, if the particle is large, a slow and wide movement is better in which the particle gives few jumps but large and if it is small it is better than many jumps but smaller. It is a question of the particle not passing several single jump holes.

In the screens, as in any sorting machine, it is necessary to take advantage of the entire width of the work surface from the beginning of it. If the product falls piled on the screening surface, the particles of the top of the pile will not touch the mesh or the screening element until the pile disappears by the vibration. By the time this happens, it will already have traveled half way of the surface. In other words, we waste surface with a very important loss of production and also the area where the pile is made will receive severe wear with the consequent extra maintenance expenses. It also increases, especially with products of low density, the risk of jams if the pile takes a lot of height. This makes no sense and it is not acceptable for correct screening.

A good vibrating screen must be reliable, minimize wear and maintenance and have a strong vibration as any vibrating machine that boasts: the more it vibrates the better it goes, that is, it gives more production and efficiency.

On the other hand, most of the bad screens are not really bad but inappropriate to use: If the product is wet and sticky, it will stick to a metal screening element rather than a polyurethane screening element. If it is dry and fine, the screen should be dust-tight. If it is a matter of screening large and heavy particles, the screen should be very robust. If it is very robust and used with fine products, it will consume more than necessary in electricity and maintenance costs (but that shouldnt pose as a problem because business energy suppliers can be compared at Utility Saving Expert).

The combinations are endless, and a good selection, suitable for use at first, will make the user does not have to remember this machine again in life, or at least until he needs to install another screen.

ore, rock & aggregate screening (complete guide)

ore, rock & aggregate screening (complete guide)

A simple definition of a screen is a machine with surface(s) used to classify materials by size. Screening is defined as The mechanical process which accomplishes a division of particles on the basis of size and their acceptance or rejection by a screening surface.

Knowledge of screening comes mainly from experience. However, through experiment, test facilities and compilation of field data, reliable criteria have been developed by screen manufacturers. This factual data is now tabulated for use in selecting the type and size of screen best suited for the job.

The most common application of a vibrating screen is to separate an unconfined conglomerate of materials into different size fractions. Other popular uses of screens are scalping, washing, dewatering and dedusting. A review of the duty is essential to know the type of screen to recommend. When this is established, the capacity chart is then used to determine the size of unit required.

Nordberg-Lokomo supplies different types of screens, each designed for a specific range of duty. Occasionally there is a choice between the types we offer. In these cases when there is doubt, you can rely on Nordberg-Lokomo experience to help you make the selection.

COARSE FRACTION Particles which pass over the screen deck, FINE FRACTION Particles which pass through the screen deck. SEPARATION SIZE/ SPLIT SIZE Particle size at which feed separates into two products (coarse fraction and fine fraction). OVERSIZE Material larger than the hole size. UNDERSIZE Material smaller than the hole size. HALF SIZE Material smaller than half of the hole size. SCREENING CAPACITY (Q)Amount of material passing through the screen deck in tonnes/hour FEEDING CAPACITY Amount of material fed to the screen deck in tonnes/hour EFFICIENCY OF SCREENING (EFFICIENCY OF UNDERSIZE RECOVERY)Amount of material smaller than the hole size in undersize compared to the total amount of material smaller than the hole size in the feed.

The particle distribution of the feed has an essential impact on purity. See three examples in figure 1. In each one of them the efficiency is 90 %, but the undersize proportion of the coarse fraction varies (3.2 %, 9.1 %, 23 %).

Factors effecting the screening can roughly be divided into three groups: characteristics of material (B, C, F, K, L) characteristics of screen (D, E, AF) characteristics of screening element (A, G, H, J)

[t/h] (passing through) A = Nominal capacity [(m/h)/m] (passing through) B = Oversize factor C = Halfsize factor D = Deck location factor E = Wet screening factor F = Material weight [t/m] (bulk density) G = Efficiency factor H = Shape factor for mesh holes J = Factor for proportion of holes in the mesh K = Factor for crushed stone and gravel L = Factor for humidity content AF = Effective screening area [m]

The factors are obtained from diagrams based on relationships observed empirically. Since these factors are known, it is consequently possible to calculate the specific capacity of the screen in tons/h per square meter.

The amount of oversize describes the amount of the particles of the limit size. Particles which are considerably larger than the hole do not make screening difficult. Large stones push stones of limit size through the screening element.

The quantity of the half size is used to inform / present the quantity of the fine material. Material smaller than half the hole size passes through the screening element very easily. If a feed contains a lot of fine material, it can be fed in large quantities onto a screen. If there is little fine material the screening capacity falls. This is due to the fact that there are a lot of particles of limit/critical size. The throughput of particles of limit size (0.5 1.0 x hole) is very poor.

Flaky (thickness is small, relative to the other two dimensions) and elongated (length is larger than other two dimensions) stones are the most difficult to screen. They pass over the screen deck laying on their widest side. At worst they become wedged in holes and thus block the whole screen deck.

When the humidity is under 3 % it has no significant importance. The problems start at 4 5 %. At 9 30 % screening is very difficult. When there is more water the screening gets easier, and it is close to separation of water screening.

Stroke length, rotation speed, stroke angle, and screen inclination form together parameters which affect the operation of the screen. These fundamental factors have to be in proportion to each other. Stroke length and material amplitude have an effect on:

how the holes of the element stay unblocked. If the stroke length is too small also the material amplitude stays too small and the element gets blocked. The problem arises when the hole size is large (50 mm or more).

Acceleration of the screen box can be calculated by the stroke and rotation speed. When stroke angle and inclination are taken into the calculation, the vertical acceleration can be found. Vertical acceleration has an effect on the screening efficiency and the rate of travel.

Acceleration should be 4.5-5.5 x G (G=9.81m/s) with horizontal screens to reach a good screening result. To avoid structural damage for the screening unit, no acceleration greater than 6-7 times G are allowed.

Stroke angle has an effect on the material amplitude and the rate of travel. The most suitable stroke angle for horizontal screens is 55-60 degrees. Too upright a position can reduce the rate of travel. Horizontal stroke angle can improve the rate of travel but reduce screening efficiency. It also increases the wear rate of the mesh.

Speed of travel can be increased by inclining the screening surface. If the surface is greatly inclined, the stroke must be short to prevent material sliding over the mesh too quickly. Inclination of the surface can keep the mesh holes open more easily.

The bed of material may not exceed a height more than 3-5 times the size of the mesh hole on the discharge side of the screening surface. A higher bed of material will reduce the screening efficiency. Feeding capacity for each mesh size depends on the width of the screen. To get efficient screening results the depth of material bed must be at least 2 times the mesh hole diameter on the end side of the surface. Then volume of oversize will determine the width of the screen.

The depth of material bed should be within allowable limits on the beginning and the end of the surface when choosing the screen.Screening area is not theonly dominant parameter while choosing the screen. In practice the length is 2- 3 times the width.

A deck factor should be used when calculating lower decks in muitideck screens. In lower decks the feed drops not only at the beginning of the deck, but also later in the direction of the flow. That is why material close to separation size will not be screened out.

Effective screening area is the area where material can drop down through the surface. Effective surface area is about 0.7-0.9 times the whole area. The whole area is determined by the inside parameters of the screening unit: length times width.

Figure 3. Schematic diagram showing how the screening effect varies along the screen deck. Stratification takes place within zone 1, screening of fine undersize particles (75% of the size of the screen apertures) takes place within zone 2 and screening of critical undersize particles, i.e. particles of a size close to the size of the screen apertures, takes place within zone 3.

The amount of loading influences screening efficiency. In practice it is impossible to reach 100% efficiency. Maximum efficiency is about 95%. In most of the cases 90% is achieved and the screen can be said to be under 100% loading.

The greater the open area of the mesh, the more effective is the throughput. When determining the open area of the mesh, the diameter of the wire between holes in different meshes differs, and has to be taken into consideration.

The type of the mesh will have an effect on screening efficiency. The most significant difference will be in special screening cases. For example while screening elongated material, mesh should be of the vibrating type (rubber or harpmesh)

By scalping it is meant screening of coarse material in order to remove the undersize, typically before a primary crusher. Because of the coarse feed the top deck, which may be the only one, is often of a grizzly type. i.e. grizzly bars as opposed to mesh. This type of screening calls for a robust construction whilst there is no requirement for screening efficiency.

Leaving out the ancient trommel screens, stationary grids, and similar types, the following means are used to make the screen vibrate. All screens today are vibrated by various methods to pass the undersize through the apertures of the screen mesh or grizzly bars.

By freely vibrating screens one means screens that are supported on springs, and the box is vibrated by a vibrating mechanism (also called an exciter) which vibrates the screen box in various ways, depending on the type of vibrating unit.

Screens with a circular motion are the most common type. The vibration is circular because of a single eccentric shaft mechanism. This movement would not move the material forward, unless the screen is inclined in the direction of the material flow. This in turn means that the screening efficiency is not quite as good as a horizontal screen. The capacity as such is often higher as this screen is able to transport the material more quickly. The higher the inclination, the greater the transport ability. Inclination is typically 12 20. The inclination also helps to prevent pegging.

The depth of this material layer is more critical with a circular motion screen than with a horizontal screen. The inclination reduces screening efficiency. This type of screen may be used for almost any application. They are also cheaper to produce.

The vibration of this type screen is created by two eccentric shafts, rotating in opposite directions. This gives the box a linear motion. The stroke angle would depend on the relation of the eccentric weights of the two shafts to each other. Because of the linear stroke the material is moved in the direction of the stroke and the screen may be installed horizontally. That is why they are often called horizontal screens. The inclination would be typically 0 5.

The horizontal screen gives high screening efficiency, and they are often used for final and fine screening. Another advantage over inclined screens is their lower profile and therefore, horizontal screens mean lower structures and buildings, and shorter conveyors.

Elliptical motion can be achieved by various means. One method is by using three eccentric shafts, two of which would create the long axis and the third, the short one. These screens are used in special applications where the aim is to gain advantages of both circular and linear motion screens. It is a compromise however, there would also be a measure of disadvantages. These screens are typically installed at an 0 5 angle.

The eccentric shaft(s) of this screen type are connected both to the screen box and the foundation. The two shaft type would give a circular motion whilst the single shaft type would give this near the vibrating unit, and differ with the loading, depending on the action at each end.

These screens are used mainly for screening coarse material. The screens become heavy, and the dynamic forces which the foundation has to absorb, are a disadvantage. Brute force screens are installed 12 20 inclined.

The vibration of this type of screen is created by the resonance between the under-frame and the screen box or decks, and because of the resonance little energy is needed to vibrate the box. These screens are always installed horizontally.

The advantage of this type is the high efficiency as the screen can be very long, and therefore are mainly used for fine screening. They also have a low profile which can be advantageous. However they have very heavy and expensive structures.

Sizers are generally small and equipped with multi decks to assist screening. The products of two or more decks are often blended in the chute work of the screen. They have very high capacity because of the inclination. The apertures of the meshes need to be considerably larger than the cut, and thus affect the efficiency. This is compensated for by the blending. The advantage of this type is that it can be used for difficult material with less blinding than with other types.

The steep angle at the feed end gives the material a high velocity, some 3 4 m/s. Later the angle levels out and slows down the material to 1 1.5 m/s in the middle and 0.5 0.8 m/s at the discharge end. This is where the screening efficiency is achieved. These screens are generally large and used in high tonnage plants, particularly in mining where fewer fractions are separated.

There are a number of special screens, of which the flip flop is an example. The special narrow rubber mesh strips are installed perpendicularly between two separate frames. The meshes being attached to one frame on one side and to the other at the other side the bulk receives extremely high accelerations. This helps screening of wet, dirty and other difficult materials.

This table is a guide only to the parameters of a horizontal screen. When solving screening problems, take also into account the size parameters of the material, screen cloths and physical screening conditions.

vibratory screens | general kinematics

vibratory screens | general kinematics

A leader in separation technology, General Kinematics screens can be found worldwide in a large variety of industries. From the separation of heavy ores, molten hot castings and sand, to paper products and everything in between. GK has made waves in the processing equipment industry using Two-Mass screening technology. Two-Mass technology has been revolutionary in handling load surges, increasing material retention times, and prolonging the life of vibratory equipment by years and sometimes decades. GK screening equipment designed to be low maintenance and to improve worker safety. Find the perfect screen for your application today!

Challenge Customer wanted to replace an existing vibrating screen due to frequent mechanical failure issues. Existing screen technology utilized the traditional brute force drive with large shafts, bearings, and motors. In the application, brute force screen technology typically had a useable life of around 1 year before mechanical failure occurred. The new screen needed to fit into the same area of the plant and run without issues.

Challenge Customer wanted to replace an existing vibrating screen due to frequent mechanical failure issues. Existing screen technology utilized the traditional brute force drive with large shafts, bearings, and motors. In the application, brute force screen technology typically had a useable life of around 1 year before mechanical failure occurred. The new screen needed to fit into the same area of the plant and run without issues.

General Kinematics Two-Mass Screens are unequalled in efficiency and performance. GKs proven two-mass drive system reduces electrical consumption and increases screening efficiency over traditional direct drive (brute force) designs. Dual in-board vibratory motors eliminate expensive belts, shafts, and bearings for increased uptime, longer service intervals, and the lowest cost of ownership available in a vibratory []

General Kinematics Two-Mass Screens are unequalled in efficiency and performance. GKs proven two-mass drive system reduces electrical consumption and increases screening efficiency over traditional direct drive (brute force) designs. Dual in-board vibratory motors eliminate expensive belts, shafts, and bearings for increased uptime, longer service intervals, and the lowest cost of ownership available in a vibratory []

Challenge A northern Midwest recycling company needed to improve their initial screening at their transfer station. The unit they had in service was proving very costly in spare parts and down time, and the efficiency of the screening was low. The end user at the landfill also had complaints that too much large material was []

Challenge A northern Midwest recycling company needed to improve their initial screening at their transfer station. The unit they had in service was proving very costly in spare parts and down time, and the efficiency of the screening was low. The end user at the landfill also had complaints that too much large material was []

General Kinematics announces a new game changing technology for resource recovery. General Kinematics screens have been a staple for many recycling companies around the world. The newly engineered SXS SCREEN is the first of its kind inthe industry. A side by side screen, this unit is engineered to move less dense, soft materials that []

General Kinematics announces a new game changing technology for resource recovery. General Kinematics screens have been a staple for many recycling companies around the world. The newly engineered SXS SCREEN is the first of its kind inthe industry. A side by side screen, this unit is engineered to move less dense, soft materials that []

vibrating screens - kinergy

vibrating screens - kinergy

A Dust-Tight Screening Feeder to a Secondary Crusher. It is 11 ft. (3.2 m) wide, 40 ft. (12.2 m) long and 48 (1.2 m) deep. Rated 2000 TPH of Limestone that screens the less than 6 rock, it consumes 45 hp (34 kW).

The adaptation of the patented Kinergy Drive System to Vibrating Screens is recognized as the most significant advancement in Vibrating Screens in more than 60 years! For the first time in their long history, Vibrating Screens have the most operating versatility and Energy Efficiency.

One of the reasons for this proclamation is the full range of electrical adjustment enables all these Vibrating Screens to also perform as a Feeder. The operating versatility enables sticky (adhesive) bulk solids to be screened by utilizing the automatic and repetitive pulsing kind of vibratory action.

Another is these Vibrating Screens make use of Kinergys drive technology to incorporate an underside collecting pan for the passed unders. Thus, the steep walled collecting hopper is eliminated. That reduces the height of the building or the screening tower; thereby reducing the costs of construction and added operating expense.

Kinergys linear stroke Screens allow the unit to be placed horizontally or on a shallow decline; whereas, Screens with a circular or elliptical type of vibratory motion are often required to be declined 20 for the force of gravity to assist in the needed conveying.

Kinergy Vibrating Screens are the most Energy Efficient, require minimal maintenance, operate quietly and have an electrically adjustable stroke and operating frequency. All of these features combine to ensure the best performance level.

Cleaning Unit Pieces: These single-screening deck units rely on vibration to remove clinging particles, trim edges, or anything similar from unit pieces. Example: Cleaning the various types of briquettes, pressed logs, dried pellets, or shaking off adhered sand from metal castings.

Washing: A bulk solid or unit piece can be washed while its being conveyed by mounting rows of liquid sprays directly over the screen. The liquid spray can be water, oil, liquid detergent, a chemical solution, etc.

Removing Undersize: This is also known as de-dusting, fines removal or shaking out the small size. Grading: This method is a close particle to particle or particle from slivers type of separation. As the most demanding of the sizing functions, multiple screening decks will be required.

Lowering Height: Kinergys Vibrating Screens can be installed horizontally or on a slight decline which reduces the height of the needed building or screening tower. Construction cost is reduced and the daily operating expense is less because of the lower elevation.

Energy Efficiency: All the Screens utilize the Kinergy Drive System, which is the most versatile and energy efficient drive available. This drive is a combination of a free force input from an A.C. type electric motor with the output of sub-resonant tuned springs. When the applied load increases, the springs inherently drive harder. It maximizes the use of Kinergy which is defined as the kinetic energy developed by a springs motion during the drive portion of its cycle. Thus, a 50 to 65% power reduction can be achieved.

Dust-Tight Construction: Kinergy Vibrating Screens are environmentally friendly. They can be made with dust-tight bodies that have a bolted top cover with quick opening viewports to observe the screening.

Bottom Drive Design: The Kinergy Vibratory Drive System is preferred to be located underneath the Screen body. The added bottom conveying pan for collecting the passed unders enables it most access to the screening decks. It is easier for dust-tight construction and it eliminates the need for the previously used steep walled collecting hopper located underneath.

Top Drive Design: The drive system is located above the Screen body. Typically the underside of the screening unit is completely open to permit the discharge of the unders across its width and length. If it is needed, a full length unders conveying trough can be supplied which makes the unit more readily adaptable to being dust-tight.

Operating Versatility: The operating stroke and frequency is electrically adjustable. This enables the Vibrating Screens to be automatically and repetitively Pulsed with a more vigorous vibratory action. This helps to minimize blinding of the screen media and to minimize particle adhesion.

Larger Dimensions: Kinergy Vibrating Screens can be manufactured in larger dimensions. Since the input dynamic forces are distributed, the diameter or length and width dimensions are not restricted as they would be if they were concentrated at one point. This is the reason Kinergy Driven Vibrating Screens that are unidirectional are standardized in widths to 18 ft. and lengths as required.

Minimal Maintenance: Two specific design features make Kinergy Vibrating Screens a low maintenance option. First, using components specifically designed to endure the vibratory action, the maintenance requirements decrease remarkably. Second, three components make up the drive system. These components can be changed in less than one hour by two reasonably skilled technicians. No qualified journeymen are required.

Performing as a Feeder: All Kinergy Vibrating Screens can also perform the feeding function. Install the Kinergy Vibrating Screen under the outlet of the Bin or Silo. Use the electrical control to adjust the Screening units output from zero to the maximum TPH.

Common Components: Kinergy Vibrating Screens minimize the amount of spare parts kept in stock. Most of the component parts are interchangeable with other Kinergy Driven units even though their functions may differ. These common components extend to Kinergy Vibrating Feeders, Conveyors, Fluid Bed Coolers and Dryers, Spiral Elevators and the various types of Foundry units. This reduces the number of spare parts required in inventory.

Kinergy engineers have been industry leaders in the field of Vibratory Screens for over thirty years. To learn more about Kinergys Vibrating Screens, please call today at 502.366.5685 or download Kinergys descriptive Bulletin KDVS-1 entitled Kinergy Driven Vibrating Screens.

Realizing vibrations can be very destructive, Engineers seldom considered intentionally creating vibrations in a machine to perform a beneficial function. Even so, over the years and by taking advantage of the principle of Natural Frequency, these purposely vibrated machines have been gradually but steadily improved. Thus, these Electro-Mechanical Machines now have more Electrical Operating Versatility and are ranked among the most Energy Efficient available. This history and the progressive evolution are explained in the Booklet entitled Introducing Vibratory Machines for Material Handling. The booklet is intended to be educational and is available upon request.

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