Research On Mechanical Properties And Experimental Of Active Excitation Auxiliary Cutting Experimental Table

Considering the current heavy mining and light digging in coal mines,limitations of the structural design of the fully mechanized excavation equipment,backward tunneling technology and other problems lead to inefficient tunneling,mining ratio is out of balance,at the same time,the comprehensive excavation equipment of the coal mine underground roadway is huge,the downhole environment is complicated,and the equipment is difficult to disassemble and assemble.It is difficult to analyze the mechanical properties of key components and cut efficiency improvement experiments under laboratory conditions.Based on the invention patent applied by the instructor team,"a self-excited vibration-assisted cutting and excavation simulation experiment device"(application number: CN201911264271.7)as the experimental platform,Taking the improvement of cutting efficiency as the starting point and analyzing the existing auxiliary cutting methods,the research group proposed a new type of auxiliary cutting method to study the mechanical characteristics of the auxiliary cutting experimental platform with active excitation,which has important scientific significance and Realistic value.In the research process of this article,the project was supported by the National Natural Science Foundation of China “Study on the Cutting Load Characteristics and Optimal Control of Active Excitation Excavation and Supporting Machine for Walking”(Fund No.51874158).Firstly,analyze the tunneling requirements of the comprehensive tunneling roadway,aiming at the problems of low cutting efficiency of the roadheader and serious damage to the cutting teeth,based on the premise of improving rock breaking capacity,the active excitation auxiliary cutting theory is introduced,and based on the similarity theory,a high-efficiency tunneling experiment equipment and method is proposed,design the overall scheme of the auxiliary cutting experiment platform studied in this paper.The preliminary investigation and analysis of the experimental conditions,first designed and analyzed the composition of the experimental platform,complete the verification of the working principle,combined with the structural characteristics,the principle analysis of active excitation was completed,and the PLC control program was designed in conjunction with the planning of the cutting path.Based on the similarity theory,the similarity criterion of the active vibration test bench was established,and the structural parameters and operating parameters were calculated,and then study and design the working principle and control method of the experimental platform,and carry out structural design and selection of the cutting head,rotary table,universal coupling and excitation servo electric cylinder.Use ANSYS Workbench to conduct static analysis on the above key components in different poses to determine whether their strength meets the standard.Secondly,based on the study of dynamics theory,modal analysis and dynamic response characteristics analysis of the whole test bench and key components,adopt the modal superposition method to analyze the harmonic response of the auxiliary cutting experiment table,analyze the displacement frequency response and stress frequency response distribution of key nodes of the auxiliary cutting experiment table.Determine whether the dynamic disturbance of the tunnel environment can cause the resonance of the tunneling equipment,and the impact of the cutting arm on the modal parameters and working stability of the whole machine.Finally,through the modal experiment of the active excitation auxiliary cutting test bench and the active excitation mechanics experiment,through the hammer modal test,the dynamic response curves of the fuselage at different positions are obtained,and the dynamic response parameters derived by comparing the theory,to verify the effectiveness and high efficiency of cutting coal under active excitation.The constructed test bench can perform active excitation mechanical experiments and tests on the cutting machine cutting arm under limited laboratory conditions,so as to provide a theoretical reference for selecting the best excitation-assisted cutting parameters,and at the same time from external excitation This angle opens up new ideas and new methods for the energysaving and efficient work of the cutting mechanism of the roadheader.Making full use of the overall structure,working performance and dynamic characteristics of the roadheader,the introduction of an active vibration-assisted cutting method is of great significance to the improvement of the cutting efficiency,stability characteristics and service life of the whole machine.