Horomill Grinding-roller System Finite Element Analysis And Load Identification

Horomill is a new type of grinding equipment with energy saving and environmental protection. Many scientific research institutes and companies carry out a comprehensive and systematic research and exploitation because of its advantages such as reliability, stability, low consumption and so on. But the domestic research and application is relatively scarce which has the following reasons:the lack of intensity analysis and expiration analysis, horomill’s roll break, the tube body dehiscence and poor operational stability. Mostly, it will cause much waste of manpower and material resources when the physical prototype of horomill is exploited. The virtual prototype technology an not only reduce the design, and the costs of the research but also ensure the design and the quality of the product. Therefore, this thesis applies the horomill roller system mechanical analysis by virtual prototype technology and the vibration testing of a group within the roller grinded factory. It reviews the current situation of the development of the grinding technology and analyzes the principle and the structural characteristics of horomill, then it does the following work1. The static and dynamic calculation of the grinding roll institutions’intensity and rigidity to insure the success of the experiment.(1) It sets up3D model of the roller using3D modeling software UG and builds two finite element mechanics model importing AWE (one is move, rolling location based on both ends, constraints, and the other is rolling load applied load, the roller surface area on both ends displacement constraints) based on the static stress analysis and intensity, and concludes that the size and the distribution principle of the two kinds of static stress;(2) Firstly it has the modal analysis on roll grinding institutions (on both ends of the hydraulic cylinder which is equivalent to the spring) using AWE and then sets up two different kinds of grinding roll dynamic model (one is equivalent to the hydraulic cylinder with both ends of rigidity and damping spring, rolling area; the other is the dynamic load which puts pressure on both ends dynamic load, arm crushes on area elastic constraint), and separately calculates the two models of dynamic stress;On the one hand, it checks the strength and stiffness of the structure design; on the other hand, it verifies the feasibility of the design parameters of the structure in a certain extent based on the above analysis.2. Vibration test of the horomill for the basis of the operational supervision.(1) It tests the vibration data in the field of three parts to different conditions of grinding machine operation:the vibration test of roll grinding institutions, the vibration test of pressure arm bearing and the vibration test of grinding machine foundation, and then obtains the transfer rate of the mill vibration on the analysis of the roller bearings and the vibration data of the radial direction of bearing base;(2) It has a study on the roller grinding force in the vibration of the plane, and in the grinding force of the plane of the role and the rotating motion through the analysis of the roller, the material into the radial and axial vibration acceleration data. It also draws a conclusion that axial dynamic stiffness enhances with the increase of the pressure by analyzing the roller axial acceleration data and researching the system vibration of the grinding machine under different pressure.3.The load identification of horomill was completed for the first time, which provides powerful tools for the great design of the horomill at home and abroad.(1)It introduces the basic theory of the inverse pseudo-excitation method and the principle of the simulation of grinding roll institutions frequency response function; the roller is simplified to a rigid, the movement of the roller grinding force from the plane in translation center of mass and around the centroid rotation to describe. And then it consequently reduces to a mass of a roller concentration and goes around the centroid of a torque according to the principle of simplified force of the role in the roll shaft grinding force.(2) It puts the roller as a rigid and simplifies pressure arm as flexible body to form just-play the coupled dynamics model using ADAMS software. And the simulation works out their corresponding to the input/output frequency response function after the roller centroid concentrates and goes around the centroid of torque as input force respectively, the roller centroid acceleration and goes around the center of the motion of the rotation acceleration as the output response respectively.It has a performance of two components of the power spectral density curve of the grinding force by using inverse pseudo-excitation method principle according to the mill normal grinding conditions, and the field test of the roller on the second point of acceleration power spectral density, and the grinding institutions-play just coupled dynamics model.