Abstract
By studying dynamic characteristics of the leaf spring system, a new elastic component is designed to reduce the working load and to a certain extent to ensure the linearity as well as increase the amplitude in the vertical and horizontal directions in vibration screen. The modal parameters, amplitudes, and amplification factors of the leaf spring system are studied by simulation and experiment. The modal results show that the leaf spring system vibrates in horizontal and vertical directions in first and second mode shapes, respectively. It is conducive to loosening and moving the particles on the vibration screen. In addition, it is found that the maximum amplitude and amplification factor in the horizontal direction appear at 300 r/min (5 Hz) while those in the vertical direction appear at 480 r/min (8 Hz), which are higher than those in the disc spring system. Moreover, the amplitude of the leaf spring system increases proportionally with the increase of exciting force while the amplification factors are basically the same under different exciting forces, indicating the good linearity of the leaf spring system. Furthermore, the minimum exciting force occurs in the leaf spring system under the same amplitude by comparing the exciting force among different elastic components. The above works can provide guidance for the industrial production in vibration screen.
Highlights
Vibrating screen is a kind of common large-scale mechanical equipment used for screening or size measurement of rock and ore in mining engineering.[1]
The first to fourth mode shapes of the leaf spring system are shown in Figure 4(a)–(d), respectively
The modal results show that the leaf spring system vibrates in horizontal and vertical directions in first and second mode shapes, respectively
Summary
Vibrating screen is a kind of common large-scale mechanical equipment used for screening or size measurement of rock and ore in mining engineering.[1] At present, there are many kinds of vibrating screens in industry such as linear vibration screen,[2] resonance screen,[3] circular vibration screen,[4] and banana screen.[5] Among them, due to simple structure, stable work, and easy control, traditional circle and linear vibration screen are extensively used in production. The vibration amplitude cannot be amplified by resonance principle in these screens. The large external excitation is needed in the traditional circle and linear vibration screen,[6] which is easy to lead to fatigue failure of vibration screen components. The resonance screen can obtain lager amplitude by resonance principle, the nonlinear spring is adopted in screen.[7,8] It contributes to the unstable working state and poor vibration linearity.[9,10] it is urgent to find a new type of vibration screen in mineral engineering
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