The vibration results from the rotation of the eccentric mass about the exciter shaft. Generally, power is transmitted from the drive motor to the vibrator assembly via a V belt transmission. The speed of the vibrating screen can be adjusted by changing the ratio of the V belt sheaves. The eccentrically bored screen sheave offsets the stroke so that drive centers do not change during operation.
Automatic center vibrating screen can be used for coarse, fine and superfine size separating for ore and coal, also can be used for dewatering or desliming processing for other materials. The automatic center vibrating screen consists of vibration exciter, screening box, supporting device and motor.
vibrating screen is used for screening of materials like ore and coal to the extent of coarse, medium fine and extremely fine as well as dehydration and desliming of materials. A vibrating screen mainly consists of screen box, exciter, suspension device and motor in terms of structure. A motor drives spindle of the exciter to rotate via the triangle belt and unbalance of the exciter produces the action of centrifugal inertia force on the screen box to make it vibrate.
The screens in question are the in line type with two gearboxes with weights at the ends of the gearbox shafts, direct driven by a motor via carden shaft. These screens vibrate around 298mm/s RMS in the highest direction of motion. I found a beauty of a defect when I was conducting a vibrating screen structure survey, I decided to collect the usual routine vibration data from the exciter gearboxes via a flat magnet mount and found an inner race defect!
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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.
Vibrating motion for a screen is provided by means of out of balance motors or geared exciters. Enduron® vibrating screens use high g force geared exciters for machines 2.4m and wider to provide the vibration motion required. The major part of the exciter drive is the housing, which is a cast metal enclosure and serves as an oil bath.