A vibrating screen will be utilised to classify the smaller rocks when necessary. The single-deck screen mounted on an inclined frame can be used to illustrate the most fundamental aspect of the vibrating screen’s operating principle.
The horizontal scalping vibrating screen is designed with a dual-vibration motor drive. Two synchronous motors are reversely placed so that the exciter generates reverse excitation force; the exciting force generated by the eccentric block cancels each other out on the parallel direction of the motor axis and stacks together with the perpendicular direction of the motor axis, so its trajectory is linear. A linear vibrating screen is used to separate materials based on particle size. The ideal particle size range for a linear vibrating screen is between 0.074 and 5 millimetres, and the maximum size should be less than 10 millimetres.
The frame is supported by springs at each corner. This vibration is caused by a flywheel that is not properly balanced. When this wheel is revolved, an extremely irregular motion is produced. Simple screens like this can be found in rock quarries and smaller industries where particle size distribution isn’t as important. Two distinct iterations of this screen have been produced because the original model’s performance isn’t adequate to fulfil the prerequisites of the vast majority of mining operations.
You may expect to be running either a horizontal screen or an inclined vibrating screen deck most of the time. Both of these types of screen decks have their advantages and disadvantages. The titles of these screens do not represent the angle the displays are on; rather, they reflect the direction of the motion producing the vibration. This motion is what is causing the screens to vibrate.
Screen Vibration Patterns
The horizontal screen deck vibrates back and forth, whereas the inclined vibrating screen vibrates in a circular pattern.
The vibration can be produced in a variety of ways. The horizontal screen has a dual counterbalance mechanism. The counterbalance weight will alternatively encourage and retard the direction of vibration based on where the weights come opposite each other during each rotation. In the inclined vibrating screen, an eccentric shaft is employed. This method of vibration creation has an advantage over the previously described unbalanced flywheel approach.
The vibration of an imbalanced flywheel is quite powerful. This results in mechanical failure and structural damage. This issue is considerably reduced by the four-bearing design. The vibrating of these screens ensures that the ore touches the screen. The rock will be thrown about on the screen by shaking it. This implies that by the time the rock has traversed the length of the screen, it will have had the chance to strike the screen mesh at precisely the perfect angle to pass through it. The rock will be eliminated from the circuit if it is tiny enough. Of course, the enormous rock will be moved to the next step of the procedure. Depending on the volume and size of the feed, each machine may have two screens.
Design of a Vibrating Screen
It is common in plant design to add a screen in front of the secondary crusher to bypass any ore that has already been crushed small enough, thereby relieving it of unnecessary effort. Although close screening is not required, a moving bar or ring grizzly can be used, and the modern method is to use a heavy-duty vibrating screen of the Hummer type, which has no external moving parts to wear out; the vibrator is completely enclosed, and the only part subject to wear is the screen surface.
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