Working principle of rotary vibrating screen
The rotary vibrating screen uses a vertical motor as the excitation source, and eccentric weights are installed at the upper and lower ends of the motor to convert the rotary motion of the motor into the three-dimensional motion of horizontal, vertical and inclined, and then transmit this motion to the screen surface.
The material is made to do outward expansion involute motion on the screen surface, so this series of vibrating screens are called rotary vibrating screens. A rotary vibrating screen has the advantages of a long trajectory of material running and a high utilization rate of the screen surface. Adjusting the phase angle of the upper and lower ends of the weights can change the movement trajectory of the material on the screen surface. It can perform fine screening and probability screening of materials.
After the rotary vibrating screen is started, its power device is the eccentric blocks at the upper and lower ends of the vibrating motor with different phases.
Due to the high-speed placement, a composite inertial force is generated. Under the action of the sieve, it continuously reciprocates and then drives the screen surface to vibrate periodically, so that the materials on the screen surface move in a directional and active manner with the screen box, during which materials smaller than the screen surface aperture fall to the lower layer through the screen holes, become the material under the sieve, and the material larger than the aperture of the sieve surface is discharged from the discharge port after continuous jumping motion, and finally, the screening work is completed.
The motion trajectory of the vibrating body of the rotary-vibrating screen is a complex three-dimensional curve in space. The projection of this curve on the horizontal plane is a circle, and the projection on the two vertical planes is two identical ellipses.
In practical application, by adjusting the relative phase of the eccentric blocks at the upper and lower ends of the vibration motor, the movement trajectory of the material on the screen surface can be changed, so as to achieve different screening operations.