Distributed annular diffuse vibration isolator: Isolating shaft vibration of guide roller in printing machine

Abstract

The operating stability of guide roller in the printing machine is an important factor to affect the paper tape transmission, and the severe vibration of guide roller can becomes erratic the printing quality. In this paper, a novel distributed annular diffuse vibration isolator is proposed to suppress the shaft vibration of the guide roller and improve the printing performance. For discussing isolation performance, dynamic stiffness method is used for establishing the theoretical model of the proposed isolator, and calculate the vibration transmission ratio and normalized modal displacement. The results indicate that three vibration isolation frequency bands, which are 86–140, 182–224, and 236–2000 Hz, can effectively block vibration energy transmission; the normalized modal displacement decreases less between 0 and 50 Hz, decreases significantly between 50 and 1000 Hz. Finally, the experimental platform on vibration isolator of guide roller is set up to verify the vib-isolating performance. These experiment results confirm the vibration transmission ratios obtained from the experiments consistently align with the trends predicted by the theoretical model, and show that vibration acceleration RMS reaches the maximum when the driving frequency is 50 Hz, the maximal RMS before isolator is 122.7 dB; When the driving frequency is 20 Hz, the RMS reaches the minimum, and the minimum is 94 dB. Thus it indicted that the proposed vibration-isolator has excellent vibration isolation performance, can isolate the vibration of the guide roller effectively in a wide frequency range.