Design Of Three - Axis Multi - Vibration Vibrating Screen

This paper develops a new three-axials vibrating screen of changeable vibration types which can adapt to the complex conditions. The vibrating screen has a variety of movements, including elliptical, linear and variable elliptic trajectories, and the vibration mode adjusting is convenient. This technology is the first case pioneered at home and abroad. Using Pro/Mechanica software on the screen box for the kinematic and dynamic analysis, the dynamic response analysis in time domain to replace the previous static dynamic analysis method, and put forward a new method of simulating the real working conditions of screen box trajectory.This article conducts a systematic research from many aspects, such as theoretical analysis, digital simulation and dynamic test and so on. the main work is as follows:1. Through deeply analysis of the working principle of linear vibrating screen and translational elliptical vibrating screen, the design scheme of three axis vibration is put forward, and its working principle is expounded. Field tests verify its feasibility and the correctness of its work theory, and the self synchronous operation and running stability conditions under the two modes are analyzed and discussed.2. Design parameters of the ZXT-2D type vibrating screen are determined by multi-factor orthogonal experiments and Pro/Engineer software is used to complete the parameterized modeling of the main components of the screen box. According to the force center theory of the vibrating screen,formula of the installation position of the vibration exciter is deduced.The installation position of the vibrator is calculated through the parametric function of Pro/E, and the entity model of three axis vibration is completed.3. The first10order natural frequencies and vibration modes are obtained by using Pro/M software to establish the screen box finite element analysis model and carrying out the modal analysis on the screen box. Using the modal superposition method for dynamic response analysis of time domain of the screen box, the changing law of the kinematics parameters of the vibrating screen and the corresponding points’trajectories in the steady working process are gained. The research results show that the working frequency of the vibration sieve effectively avoids its every natural frequency and resonance phenomenon in stable working stages. In a word, the indicators meet the design requirements and operation smoothly.4. The dynamic stress analysis is carried out on the screen box, and from which the change rule and distribution of the value and location of maximum dynamic stress with time from start to stable is obtained. Through the analysis, the sieve box meets the strength requirements.5. The prototype is trial-produced and tested to get the kinematic parameters of its feature points. By comparing the test results and the finite element simulation results, proved the use of Pro/M for dynamic response analysis of screen box is feasible.