scholarly journals The multilayer and wide-deck vibrating screen based on the innovative long-span vibration exciter

2017 ◽  
Vol 231 ◽  
pp. 012018
Author(s):  
Ming Zeng ◽  
Zonglin Xu ◽  
Jinnan Zhang ◽  
Minghong Zhang
Keyword(s):  
Vibration Exciter ◽  
Vibrating Screen ◽  
Long Span

Substantiation of amplitude-frequency characteristics and design parameters of vibration exciter in volume oscillation separator

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
I Palamarchuk ◽  
◽  
V Vasyliv ◽  
V Sarana ◽  
M Mushtruk ◽  
...  
Keyword(s):  
Translational Motion ◽  
Operating Conditions ◽  
Design Parameters ◽  
Vibration Velocity ◽  
Vibration Exciter ◽  
Lagrange Equations ◽  
Bulk Materials ◽  
Vibrating Screen ◽  
Working Bodies ◽  
Oscillating Motion

The main effects of the developed design for vibratory separator: the increased driving force in the process of bulk material separation in this work, achieved by providing the working cylindrical-conical container with vibrational motion; improving the conditions for the passage of product particles through openings, achieved by providing the sieve surface with volume oscillations; reduction of energy consumption and improvement of operating conditions for support nodes during the operation of the designed vibrating screen, achieved due to the installation of additional elastic elements between the separator body and bearing assemblies of the vertical drive shaft in vibration exciter. Providing the working bodies of the designed vibrating screen with volume oscillating motion allows increasing the performance and quality of the separation process of solid bulk materials. To determine the rational parameters for vibration screening process, the equations of motion of working bodies as a conical sieve surface were obtained using the method of the Lagrange equations of the second order. When applying solutions of the Cauchy problem for linear nonhomogeneous differential equations, the solution of the latter was obtained. The obtained dependences of oscillation amplitudes, vibration velocity and vibration acceleration, and the intensity of oscillating motion allowed us to perform a mathematical analysis for power and energy parameters of vibration drive in the developed separator. The inclined placement of the conical sieve surface allows for spatial gyration or circular translational motion, which makes it possible to realize the advantages of volumetric separation of bulk materials. The results of the conducted analytical study made it possible to substantiate the optimal inclination angle for working sieve surface. Based on our analysis, the design parameters of vibration exciter were substantiated and clarified, and the design of this technical system was demonstrated.

Design and Research on the New Combining Vibrating Screen

2011 ◽  
Vol 201-203 ◽  
pp. 504-509 ◽  
Author(s):  
Nian Qin Guo ◽  
Hong Min Lou ◽  
Wei Ping Huang
Keyword(s):  
High Frequency ◽  
Large Amplitude ◽  
Small Amplitude ◽  
Low Frequency ◽  
The Other ◽  
Vibration Exciter ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
New Type ◽  
Equal Thickness

Basing on the traditional vibrating screen with double amplitudes and different frequency, a new type vibrating screen called combining vibrating screen is developed. It consists of two vibrating screen units. Each unit has an independent vibration exciter, realizing that one screen unit has a parameter of high-frequency with small-amplitude while the other screen unit has a parameter of low-frequency with large-amplitude. The two screen units are installed at different obliquities, so that the equal thickness screening principle can be realized. And comparing with the traditional vibrating screen, its screening efficiency and capacity are greatly improved. This new kind vibrating screen is especially suitable for the dry screening to moist particles.

scholarly journals Design and Dynamic Analysis of a Four-Degree-of-Freedom Chaotic Vibrating Screen

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mingkun Zhang ◽  
Chengjun Wang ◽  
Chen Yan ◽  
Hao Li
Keyword(s):  
Degree Of Freedom ◽  
Structure Theory ◽  
Vibration Exciter ◽  
Kinetic Chain ◽  
Kinematic Constraint ◽  
Vibrating Screen ◽  
Chaotic Vibration ◽  
Hybrid Mechanism ◽  
Short Service Life ◽  
Screening Efficiency

In order to address the problems of low screening efficiency, easy blocking of screen holes, and short service life of key parts commonly used in vibrating screen equipment, the TRIZ (Theory of the Solution of Inventive Problems) was applied in the present work to design a four-degree-of-freedom (4-DOF; three translational and one rotational movements) chaotic vibrating screen with a chaotic vibration exciter as the main power source and a 3-DOF (three translational movements) parallel kinetic chain as the kinematic constraint mechanism of the outer screen frame. Based on the topological structure theory, a hybrid mechanism with structure [ 4 SOC − C i 1 ∥ R i 2 ∥ R i 3 − + R , i = 1,2,3,4 ] was constructed as the kinematic constraint mechanism of the inner screen box of the chaotic vibrating screen to solve the freedom of motion and POC (position and orientation characteristic) equations of parallel kinematic constraint mechanism of the outer screen frame and hybrid constraint mechanism of the inner screen box. The dynamic simulation of a virtual prototype of the chaotic vibrating screen was carried out in ADAMS software, and MATLAB was used to chaos recognition of the simulation results. It was found that the chaotic exciter moved aperiodically in X-, Y-, and Z-directions when the chaotic exciter motor rotated at uniform speed, and the amplitude, velocity, and acceleration of the outer screen frame of the vibrating screen had characteristics of reciprocating aperiodic and irregular changes. Through the phase trajectories of the eccentric block and inner screen box of the exciter in all directions, it was observed that the motion output of the vibrating screen was a chaotic vibration. Therefore, the present paper can provide an important reference for the design and application of chaotic vibrating screens.

Control of Vibrations due to Moving Loads on Suspension Bridges

2006 ◽  
Vol 11 (3) ◽  
pp. 293-318 ◽  
Author(s):  
M. Zribi ◽  
N. B. Almutairi ◽  
M. Abdel-Rohman
Keyword(s):  
Bridge Deck ◽  
Suspension Bridge ◽  
Lyapunov Theory ◽  
Dynamic Responses ◽  
Suspension Bridges ◽  
Control Force ◽  
Moving Loads ◽  
Hydraulic Actuator ◽  
Long Span ◽  
Suspended Cables

The flexibility and low damping of the long span suspended cables in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck with a constant speed. A vertical cable between the bridge deck and the suspended cables is used to install a hydraulic actuator able to generate an active control force on the bridge deck. Two control schemes are proposed to generate the control force needed to reduce the vertical vibrations in the suspended cables and in the bridge deck. The proposed controllers, whose design is based on Lyapunov theory, guarantee the asymptotic stability of the system. The MATLAB software is used to simulate the performance of the controlled system. The simulation results indicate that the proposed controllers work well. In addition, the performance of the system with the proposed controllers is compared to the performance of the system controlled with a velocity feedback controller.

Load Testing of Long Span Prestressed Single Tee Beams

PCI Journal ◽  
1988 ◽  
Vol 33 (2) ◽  
pp. 42-51
Author(s):  
Predrag L. Popovic ◽  
Neal S. Anderson
Keyword(s):  
Load Testing ◽  
Long Span

Handling and Shipping of Long Span Bridge Beams

PCI Journal ◽  
1987 ◽  
Vol 32 (6) ◽  
pp. 86-101 ◽  
Author(s):  
George Laszlo ◽  
Richard R. Imper
Keyword(s):  
Long Span ◽  
Long Span Bridge ◽  
Bridge Beams

Alternate Designs for Long Span Bridges

PCI Journal ◽  
1980 ◽  
Vol 25 (4) ◽  
pp. 48-58
Author(s):  
Felix Kulka
Keyword(s):  
Long Span Bridges ◽  
Long Span

Unrivalled Influence

2013 ◽  
Author(s):  
Judith Herrin
Keyword(s):  
Political Life ◽  
General Introduction ◽  
Women And Gender ◽  
Mothers And Daughters ◽  
Diverse Range ◽  
Long Span ◽  
Imperial Court ◽  
And Gender ◽  
The Many ◽  
First Time

This book explores the exceptional roles that women played in the vibrant cultural and political life of medieval Byzantium. This book evokes the complex and exotic world of Byzantium's women, from empresses and saints to uneducated rural widows. Drawing on a diverse range of sources, the book sheds light on the importance of marriage in imperial statecraft, the tense coexistence of empresses in the imperial court, and the critical relationships of mothers and daughters. It looks at women's interactions with eunuchs, the in-between gender in Byzantine society, and shows how women defended their rights to hold land. The book describes how women controlled their inheritances, participated in urban crowds demanding the dismissal of corrupt officials, followed the processions of holy icons and relics, and marked religious feasts with liturgical celebrations, market activity, and holiday pleasures. The vivid portraits that emerge here reveal how women exerted an unrivalled influence on the patriarchal society of Byzantium, and remained active participants in the many changes that occurred throughout the empire's millennial history. The book brings together the author's finest essays on women and gender written throughout the long span of her career. This volume includes three new essays published here for the very first time and a new general introduction. It also provides a concise introduction to each essay that describes how it came to be written and how it fits into her broader views about women and Byzantium.

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