Rotation shaft with vibration damping device

Details Rotation shaft with vibration damping device Rotation shaft with vibration damping device

F - Mech Eng,Light,Heat,Weapons

16

F

F16F 15/14 (2006.01) B01F 15/00 (2006.01) B03D 1/16 (2006.01) C02F 3/28 (2006.01) F16F 15/023 (2006.01)

Patent

CA 2246160

Excessive vibration in industrial mixers such as flotation cells and draft tube mixers is attenuated by connecting a vibration dampening device to a rotor or impeller which is disposed in a mixing tank for pumping a nonhomogeneous fluidic material placed in the tank. In a draft tube mixer, where the rotor is connected to a drive shaft in turn connected to a motor for rotating the rotor, the vibration dampening device is connected to the shaft on a side of the rotor opposite the motor. In a froth flotation cell, if the rotor is hollow, the vibration dampening device is disposed inside a pipe in turn mounted inside the rotor along an axis thereof. The vibration dampening device takes the form of a tuned mass dampener tuned to a resonance frequency of the particular mixing apparatus.

Dans les mélangeurs industriels du type cuve de flottation et mélangeur à tube de circulation, on atténue les vibrations excessives en fixant un amortisseur de vibrations au rotor, ou roue, disposé dans la cuve de mélange pour pomper une suspension liquide non homogène. Dans un mélangeur à tube de circulation dont le rotor est couplé à un arbre d'entraînement lui-même couplé à un moteur, l'amortisseur de vibrations est fixé à l'extrémité de l'arbre opposée au moteur. Dans une cuve de flottation par moussage à rotor creux, l'amortisseur est disposé à l'intérieur d'un tube monté à l'intérieur du rotor le long d'un axe de celui-ci. L'amortisseur prend la forme d'une masse accordée à la fréquence de résonnance du mélangeur à protéger.

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