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The Vibrating Screen is available in single and multiple deck units for floor mounting or suspension. The side panels are equipped with flanges containing precision punched bolt holes so that an additional deck may be added in the future by merely bolting the new deck either on the top or the bottom of the original deck. The advantage of this feature is that added capacity is gained without purchasing a separate mechanism, since the mechanisms originally furnished are designed for this feature. A positive method of maintaining proper screen tension is employed, the method depending on the wire diameter involved. Screen cloths are mounted on rubber covered camber bars, slightly arched for even distribution.
Standard screens are furnished with suspension rod or cable assemblies, or floor mounting brackets. Initial covering of standard steel screen cloth is included for separations down to 20 mesh. Suspension frame, fine mesh wire, and dust enclosure are furnished at a slight additional cost. Motor driven units include totally enclosed, ball bearing motors. The Vibrating Screen can be driven from either side. The driven sheave is included on units furnished without the drive.
The unit consists of the freely suspended screen body and a shaft assembly carried by the screen body. Near each end of the shaft, an eccentric portion is turned. The shaft is counterbalanced, by weighted fly wheels, against the weight of the screen and loads that may be superimposed on it. When the shaft rotates, eccentric motion is transmitted from the eccentric portions, through the two bearings, to the screen frame.
Linear vibrationachieved with two synchronized vibrator motors or a single pneumatic vibratorhelps these industrial type screeners reach peak performance with minimal downtime. Screeners built with pneumatic or electrically powered vibrators are available in single, double, or triple decks, again depending upon the size and composition of ...
McLanan Vibratory Screens are engineered with ASTM A572 Grade 50 steel side plates. With a tensile strength of 65,300psi , these side plates have a 45% higher yield strength than A 36 steel, which can withstand up to 36,000 psi of stress before it begins to drastically deform.
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Vibrating screens are characterized by dynamic motions mostly in the vertical plane . The acceleration of such movements typically ranges from 3 to 6 g or even more. The lifting and dropping effect expands the effective screening bed. Pure vertical motion gives individual particles opportunity for finding and passing through an opening. Added horizontal motion can resolve this issue and spread materials over the screen. On the other hand, the vertical force component acts to eject near size particles stuck in the openings, thus resisting progressive blinding, and the turbulent expansion of the material bed prevents packing. Therefore, effective screening usually requires a proper combination of vertical and horizontal vibration. The performance of a vibrating screen can be optimized for any application by changing the vibration amplitude and frequency. The screening rate and performance respond more to...
The basic operation of a vibrating screen is simple. The screen presents a barrier to the passage of oversize material but passes undersize material. Vibration facilitates this process by creating the movement needed to ensure that each particle has opportunities to reach the screen. In fact, each particle should receive several opportunities to pass through the screen. However, the actual screening process isnt quite that simple. It involves many side effects and complicated sub activities; all of these require very careful review and consideration. For instance, the motion imparted to solid particles during screening can generate dust. It also can result in the particles becoming electrostatically charged. Static charges can lead to screen blinding and significantly reduce the efficiency of the screen. In general, blinding is a major issue with any screen. In addition, static charges can act as an ignition source, which can be a major risk for some applications. All the metal com...
Construction materials for Vibratory Screens includes mild steel, 304 or 316 stainless steel. Mild steel troughs can be painted in process specific painting systems. Stainless steel troughs can be finished as per requirements. Operation angles are critical to screen performance.
The under performance of these screens is also possible due to various factors. Failure and under performance of vibrating screens are most likely caused by the following reasons: Screen Openings. Failure and under performance of vibrating screens might be due to the existence of damages and holes on the screen mesh.