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vibratory screens| mclanahan

Screens can be considered the cashbox of the operation, because while crushers make 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. 

vibratory screens| mclanahan

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

vibratory screens| mclanahan

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

vibratory screens| mclanahan

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.

vibratory screens| mclanahan

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. It’s 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. 

vibratory screens| mclanahan

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 an operation 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. 

kinematics of a novelscreensurface and parameter

Dry deep screening plays an important role in the cleaner production of steam coal, increasing the sorting proportion of steam coal and realizing the reduction of the produced slime to prevent environmental pollution. In this study, a rigid-flexible-coupled elastic screen surface (R-FCESS) was proposed for steam coal classification with 3-mm apertures. In addition, the motion trajectory and vibration mode composition of regions on the R-FCESS were investigated by vibration testing technology. The acceleration amplitude on the elastic region of the R-FCESS reached 46.98 m/s2, which was increased by 22.91 m/s2 in comparison with that of the rigid region. The spatio-temporal evolution and distribution of the material bed on the screen surface were analyzed by using a high-speed camera. The projection height of particles in the elastic region was considerably greater than that in the rigid region. Furthermore, the −3 mm classification test of steam coal was carried out, and effects of the excitation force, current frequency, and feed rate on the screening effect were clarified. At an excitation force of 6.43 kN, a current frequency of 48 Hz, and a feed rate of 2.00 kg/s, the screening efficiency and total misplaced material were 89.27% and 5.92%, respectively. Based on the study, a novel process for the separation of steam coal was proposed, leading to the low coal slurry production as well as low pollution

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