The Impact of Vibrating Screen Startup Time on Vibration Amplitude and Energy Consumption in Transient State

Abstract

The article presents the results of research on the trajectory and amplitude values during the startup of a vibrating screen, depending on the set startup time. The research was conducted using a suspended vibrating screen with a segmental vibration trajectory, where vibration excitation was achieved through two vibratory motors directly attached to the screen frame. The vibratory motors were powered with three-phase voltage and connected to the grid through frequency converters, allowing for current control in steady-state and startup conditions. The analysis focused on the vibration trajectory and the resulting amplitude values for nine selected startup times (ranging from 0 s to 8 s). Two measurement methods were employed: using piezoelectric acceleration sensors and optical recording. Additionally, the momentary power consumption by the screen drive was recorded, and the maximum current flowing in the power supply circuit was determined. These studies enabled the determination of the most favourable startup parameters that reduce the power demand of the drive without significantly affecting the kinematic parameters of the screen during its startup. The results of experimental research presented in the article regarding the startup time of the screening machine and its influence on vibration parameters have shown that the startup time significantly impacts the amplitude values that occur during startup. In the analysed case, the most favourable startup time was 3 s. Power consumption studies during startup revealed that startup time has a notable influence on momentary power consumption. The conducted research demonstrated that for startup times below 0.2 s, the maximum momentary power was the highest (reaching 5 kW, with a current consumption of 4.5 times the rated current). Regarding energy efficiency, the most favourable startup times exceed 2.0 s. Extending these startup times can significantly reduce the power demand of the drive, even up to threefold, thereby enabling the selection of motors with much lower power ratings.

Kinematic analysis and geometrical parameters justification of a planetary-type mechanism for actuating an inertial vibration exciter

“…In order to provide the best performance of the mentioned operations while processing different products, the used vibration exciter should be able to adjust its inertial characteristics according to the prescribed technological conditions [1]. In addition, the design peculiarities of the exciter influence the startup duration and energy consumption of the vibratory equipment [2], as well as the kinematic and dynamic characteristics of the working member (trajectory, velocity, acceleration, overloading, etc.) [3].…”

The Influence of the Grinding Media Diameter on Grinding Efficiency in a Vibratory Ball Mill

“…The dominant majority of vibratory mills are tubular mills whose chambers perform vibrating motion with a vibration amplitude trajectory close to circular or elliptical. In most designs, they are vibrating machines—super-resonant, with vibrations forced using inertial vibrators—just like the widely known and used vibrating screens [ 42 ]. The efficiency of industrial mills, determined by their use, the type of ground material, grinding conditions, and grain size of the feed and grinding product, ranges from several dozen kg/h to 60 Mg/h [ 38 ].…”