| The rocker arm of the shearer is connected with the traction part of the fuselage through the connecting frame,and the connecting frame and the rocker arm and the traction part of the fuselage are respectively hinged through the connecting pin shaft,and the cutting drum is subjected to the cutting resistance during the cutting of the coal wall by the shearer,The traction resistance,the lateral force and the like are transmitted to the rocker arm,which may cause the connection between the rocker arm and the connecting frame connecting pin shaft and the connecting frame and the fuselage connecting pin shaft,so the connecting pin of the connecting frame and the rocker arm and the body traction portion are connected.The load analysis and structural optimization of the shaft can provide a theoretical basis for the fault-free operation of the shearer,thereby improving the efficiency of coal mining.This paper relies on the National Energy Administration "National Energy Mining Equipment R&D Center" cooperation project(No.: 2010-215)-"High-end comprehensive mining equipment theory and key technology research",with MG500/1180 shearer as the research object,A section of pin joint between the coal machine body and the rocker arm,a two-stage pin shaft connection,and a structural form such as a connection frame between the fuselage and the rocker arm are used to carry out the force analysis analysis of the pin shaft.The main work is as follows:The static model of the rocker connecting pin shaft of the shearer is constructed.The model is over-constrained and the result of the solution is diverged.The finite element analysis method is used to simulate the force of the rocker pin,and the 1:1 simulation platform is obtained.The three-way load of the drum is applied to the model to obtain the maximum stress and maximum deformation distribution of the two-stage and one-stage connecting pin under different lifting angles and pin gaps of the rocker arm,and the connection when attaching the connecting frame The maximum stress and maximum deformation distribution of the pin.The multi-body dynamics simulation software Recurdyn was used to soften the rocker arm,connecting frame and connecting pin of the shearer respectively,and the rigid-flexible coupling dynamic model of the rocker-connector-body of the shearer was established.Dynamic simulation analysis,the contact force of the two-stage and one-stage connecting pin under different lifting angles and pin gaps of the rocker arm when the connecting frame is obtained,and the contact force of the connecting pin shaft when the connecting frame is installed.For the stress concentration phenomenon of the connecting frame,the structuraloptimization module Desigh Xplorer in ANSYS Workbench software is used to optimize the thickness of the connecting lug plate,the thickness of the side wall of the coal wall DS_bh and the thickness of the hollow side rib DS_ckbh as the optimal design variables.The coal machine frame is structurally optimized.The effectiveness of the optimization is determined by comparing the quality of the joint frame,the maximum stress and the maximum elastic deformation before and after optimization.The ANSYS nCode DesignLife fatigue life analysis software was used to analyze the shearer joints before and after optimization.The correctness of the optimization was proved by comparing the fatigue life cloud map and the fatigue damage cloud map of the front and rear joint frames.The research results of this paper can provide theoretical support for efficient mining of coal mining machine and structural design optimization,and have certain engineering value and theoretical significance.The test include 56 pictures,17 chart and 62 references. |
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