Multi-Dimensional Vibrating Screen Design and Motion Analysis

2011 ◽  
Vol 201-203 ◽  
pp. 1672-1677
Author(s):  
Cheng Jun Wang ◽  
Lv Zhong Ma ◽  
Yao Ming Li
Keyword(s):  
Motion Analysis ◽  
Functional Properties ◽  
Degree Of Freedom ◽  
Structural Performance ◽  
Screen Effect ◽  
Performance Parameters ◽  
Screen Design ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
Motion Performance

a kind of multidimensional vibrating screen has been developed by the author in order to improve the screening efficiency of material. The paper introduces the structure composition and functional properties of multidimensional vibrating screen. The structural performance parameters such as degree of freedom, virtual constraint and coupling degree of the main mechanism have been calculated. And the motion performance of the multidimensional vibrating screen has been analyzed. Meanwhile the kinematics equation is established. This kind of multidimensional vibrating screen not only has concise structure and better symmetry and decoupling performance, but also improve the dispersion and leaking screen effect obviously compared with traditional vibrating screen.

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.

Numerical simulation of particle screening efficiency of large multi-layer vibrating screen based on discrete element method

2021 ◽  
pp. 095440892110606
Author(s):  
Yujia Li ◽  
Peng Zhao ◽  
Li Mo ◽  
Tao Ren ◽  
Minghong Zhang
Keyword(s):  
Discrete Element Method ◽  
Environmental Protection ◽  
Inclination Angle ◽  
Discrete Element ◽  
Physical Parameters ◽  
Screening Process ◽  
Efficient Operation ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
Element Method

With the increasing requirements for energy conservation and environmental protection, multi-layer vibrating screens have become hot issues. Compared with single-layer vibrating screens, multi-layer vibrating screens has much better performance in terms of processing effect, treatment capacity, and environmental protection. The research on the physical parameters of the multi-layer vibrating screen is of great significance to the actual production. However, analysis and simulation studies of multi-layer vibrating screens are limited. In this paper, the screening process of wet particles on a multi-layer vibrating screen was simulated by using the discrete element method. The characteristics and application scope of the two vibration modes were analyzed. The particle penetration rate, the number of collisions, and the distribution of the particles under 23 combinations of structures and vibration parameters were investigated. The influence of different parameters on screening performance was analyzed. Several optimal combinations of frequency, amplitude and screen inclination angle under different working conditions were obtained. The screening efficiency of the balanced elliptic motion is higher than that of the linear motion. The best combination of the three parameters is 4 mm amplitude, 20 Hz frequency, and 3° inclination angle. The efficiency is higher when the particles follow a distribution of arithmetic on the screen. This study provides a reference for the efficient operation and optimal design of large multi-layer screening equipment.

scholarly journals Numerical Investigation on the Sieving Performance of Elliptical Vibrating Screen

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1151
Author(s):  
Zhiquan Chen ◽  
Xin Tong ◽  
Zhanfu Li
Keyword(s):  
Major Axis ◽  
The Finite Element Method ◽  
Semi Major Axis ◽  
Vibration Direction ◽  
Maximum Deformation ◽  
Vibrating Screen ◽  
Performance Indexes ◽  
Screening Efficiency ◽  
Axis Length ◽  
Element Method

Screening techniques have been widely deployed in industrial production for the size-separation of granular materials such as coal. The elliptical vibrating screen has been regarded as an excellent screening apparatus in terms of its high screening efficiency and large processing capacity. However, its fundamental mechanisms and operational principles remain poorly understood. In this paper, the sieving process of an elliptical vibrating screen was numerically simulated based on the discrete element method (DEM), and an approach coupling the DEM and the finite element method (DEM–FEM) was introduced to further explore the collision impact of materials on the screen deck. The screening time, screening efficiency, maximum stress and maximum deformation were examined for the evaluation of sieving performance. The effects of six parameters—length of the semi-major axis, length ratio between two semi-axes, vibration frequency, inclination angle, vibration direction angle and vibration direction—on different sieving results were systematically investigated in univariate and multivariate experiments. Additionally, the relationships among the four performance indexes were discussed and the relational functions were obtained. The conclusions and methodologies presented in this work could be of great significance for the design and improvement of elliptical vibrating screens.

Interpreting Sensor Data Using Continuous Wavelet Transformations

2004 ◽  
Author(s):  
Stephanie A. Wimmer ◽  
Virginia G. DeGiorgi
Keyword(s):  
Wavelet Transformation ◽  
Sensor Data ◽  
Structural Performance ◽  
Continuous Wavelet ◽  
Performance Parameters ◽  
Element Analysis ◽  
Health Monitoring System ◽  
The Past ◽  
Time Histories ◽  
Low Levels

Structural monitoring systems consist of a method to measure the structure’s performance at a given point in time to produce raw sensor data and the interpretation of this data in terms of presence and location of damage. This work focuses on the interpretation. The raw sensor data needs to be examined to indicate when further inspection is necessary, prior to the degradation of key structural performance parameters. Finding low levels of damage is critical to the development of a health monitoring system. This paper describes the use of the continuous wavelet transformation in the identification of damaged plates. Strain time histories are used in the algorithm. The strain histories are measured experimentally. In the past the authors have used finite element analysis to generate virtual sensor data. The authors track how the wavelet maximas change as damage accumulates. Various excitations are used to determine their affect.

Motion Performance Analysis of Double-Cylinder Parallel Manipulators

2009 ◽  
Author(s):  
Hong Zhou ◽  
Shehu T. Alimi ◽  
Aravind Ravindranath ◽  
Hareesh Vepuri
Keyword(s):  
Performance Analysis ◽  
Parallel Manipulator ◽  
Critical Role ◽  
Parallel Manipulators ◽  
Degree Of Freedom ◽  
Serial Manipulators ◽  
Operation Speed ◽  
Transmission Angle ◽  
Motion Performance ◽  
Two Degree Of Freedom

Double-cylinder parallel manipulators are closed-loop two-degree-of-freedom linkages. They are preferred to use because of their simplicity plus the common advantages of parallel manipulators such as high stiffness, load-bearing, operation speed and precision positioning. Like other parallel manipulators, the output motion of double-cylinder parallel manipulators is not as flexible as two-degree-of-freedom serial manipulators. The motion performance analysis plays a critical role for this type of parallel manipulator to be applied successfully. In this paper, the linkage feasibility conditions are established based on the transmission angle. When feasibility conditions are satisfied, there is no dead position during operation. The workspace is generated by using curve-enveloping theory. The singularity characteristics are analyzed within the workspace. The motion performance index contours within the workspace are produced using the condition number of the manipulator Jacobian matrix. The results of this paper provide guidelines to apply this type of parallel manipulator.

Helical Motion Analysis of the 2-Degree-of-Freedom Split-Stator Induction Motor

2019 ◽  
Vol 55 (6) ◽  
pp. 1-5 ◽  
Author(s):  
Lujia Xie ◽  
Jikai Si ◽  
Yihua Hu ◽  
Haichao Feng
Keyword(s):  
Induction Motor ◽  
Motion Analysis ◽  
Degree Of Freedom ◽  
Helical Motion

scholarly journals Dynamic Modeling and Parameters Optimization of Large Vibrating Screen with Full Degree of Freedom

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaodong Yang ◽  
Jida Wu ◽  
Haishen Jiang ◽  
Wenqiang Qiu ◽  
Chusheng Liu
Keyword(s):  
Neural Network ◽  
Elastic Deformation ◽  
Parametric Modeling ◽  
Parameters Optimization ◽  
Degree Of Freedom ◽  
Design Parameters ◽  
Response Analysis ◽  
Lateral Plate ◽  
Beam Position ◽  
Vibrating Screen

Dynamic characteristic and reliability of the vibrating screen are important indicators of large vibrating screen. Considering the influence of coupling motion of each degree of freedom, the dynamic model with six degrees of freedom (6 DOFs) of the vibrating screen is established based on the Lagrange method, and modal parameters (natural frequencies and modes of vibration) of the rigid body are obtained. The finite element modal analysis and harmonic response analysis are carried out to analyze the elastic deformation of the structure. By using the parametric modeling method, beam position is defined as a variable, and an orthogonal experiment on design is performed. The BP neural network is used to model the relationship between beam position and maximal elastic deformation of the lateral plate. Further, the genetic algorithm is used to optimize the established neural network model, and the optimal design parameters are obtained.

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