Kneading extruder having a speed regulator and resonance suppressor

摘要

It is intended to provide a kneading extruder which makes it possible to prevent breakage due to resonance regardless of the rotating speed of kneading screws. The kneading extruder comprises a driving motor, kneading screws for kneading a material, each of the kneading screws having a screw shaft, a motive power transmitting path including a first speed regulator for varying a rotating speed produced by motive power output from the driving motor, the motive power transmitting path serving to transmit the motive power which produces a rotating speed varied by the first speed regulator to the screw shafts of the kneading screws, and a resonance suppressor for suppressing torsional resonance of the kneading screws caused by fluctuations in load exerted on the kneading screws, the resonance suppressor serving to reduce a resonance response factor which is the ratio of an output amplitude of the kneading screw amplified by resonance response to an input amplitude of the kneading screw caused by the fluctuations in load to suppress the torsional resonance.

主权项

1. A kneading extruder comprising:
a driving motor; a pair of kneading screws for kneading a material, each of the kneading screws having a shaft; a motive power transmitting path including a first speed regulator for varying a rotating speed produced by motive power output from said driving motor and a second speed regulator provided between said driving motor and said first speed regulator, said motive power transmitting path serving to transmit the motive power which produces a rotating speed varied by said first speed regulator, said first speed regulator being configured to divide the motive power output from said driving motor into two parts so as to transmit the two parts of the motive power to respective ones of the shafts of said pair of kneading screws, said second speed regulator having a larger moment of inertia than that of said first speed regulator for input rotary motion; and a resonance suppressor for suppressing torsional resonance of said pair of kneading screws caused by fluctuations in load exerted on the kneading screws, the resonance suppressor serving to reduce a resonance response factor which is the ratio of an output amplitude of the kneading screws amplified by resonance response to an input amplitude of the kneading screws caused by the fluctuations in load to suppress the torsional resonance, said resonance suppressor is provided between said first speed regulator and said second speed regulator in said motive power transmitting path.