Static/Dynamic Characteristics Analysis And Lightweight Design Of Key Components Of 15000 Mine Directional Drilling Rig

The mine directional drilling rig is an important equipment for controlling gas and ensuring efficient production in coal mining.At present,in order to adapt to the complex high-strength working conditions underground,the design of key parts of directional drilling rig is too conservative,the strength design allowance is too large,and the disassembled parts are too heavy,which is extremely inconvenient to transport,install and move in the mine.Therefore,the lightweight design of directional drilling rigs can improve material utilization,reduce energy consumption,and achieve energy saving and emission reduction green manufacturing.In this paper,the ZYL-15000 D mine directional drilling rig is taken as the research object,and the finite element analysis of the newly designed automatic rod-up mechanism of the drilling rig and the reducer box is carried out.On this basis,the topology optimization and size optimization methods are used for lightweight design.The main research contents are as follows:(1)Based on the structural strength analysis of the automatic rod-up mechanism of drilling rig,the structure of the automatic rod-up mechanism was optimized.Firstly,the finite element model of the automatic rod loading mechanism under actual working conditions is established by using Hyper Mesh,and the static strength analysis is carried out.Aiming at the problem of insufficient stiffness of the original structure,a double arm automatic rod loading mechanism is proposed.Secondly,using Optistruct to optimize the variable density topology of the double arm frame,the weight of the double arm frame is reduced by 22% under the condition of meeting the design requirements.(2)The static strength of the reducer box of the drilling rig is analyzed,and the reducer gear is optimized.Based on the actual dangerous working conditions of the drilling rig,the static strength of the reducer box of the drilling rig is analyzed,and the gear of the reducer box is optimized and checked to make the internal structure of the reducer box more compact,so as to reduce the overall size of the reducer box,and the weight of the reducer box is reduced by17 % after the gear optimization.(3)The dynamic characteristics of the reducer box are analyzed,and the size is optimized based on the sensitivity analysis method.The free modal analysis,constraint modal analysis and harmonic response analysis of the main parts of the gearbox box are carried out.The free modal analysis,the constrained modal analysis and the harmonious response analysis of the main components of the gearbox were carried out to verify the dynamic characteristics of the structure,and the maximum equivalent force,the first-order inherent frequency and the mass of the gearbox were used as the performance indicators for sensitivity analysis.The central composite design test method is used and the response surface model is fitted and compared with the fitting accuracy based on the full second-order polynomial;the maximum stress and the first-order inherent frequency of the gearbox are used as the constraints,and the minimum mass is used as the optimization target for the lightweight design,and finally the mass of the box is reduced by 40.6Kg under the condition of meeting the design requirements.