Research On Dynamic Characteristics Of Anchoring And Anchoring Units In Horizontal Cutting Conditions

In order to solve the problem of low efficiency of roadway excavation in China,the research group proposed a four-function excavation,anchoring and anchoring equipment.In this paper,based on the invention patent “a kind of step-and-shoulder anchor combined unit and its use method ”(patent number: ZL201810959282.6),the structure is improved and a double cutting section is obtained.This paper mainly studies the dynamics of the whole machine under the condition of horizontal yaw cutting.This topic has received strong support from the National Natural Science Foundation of China,“ Study on the Cutting Load Characteristics and Optimized Control of the Actively Excited Excavation and Clamping Machine”(Fund No.:51874158).Firstly,based on rock mechanics,the force of the cutting and cutting head during the cutting process is theoretically explored,and the load characteristics of two completely symmetrical structural cutting heads are obtained,and different cutting processes are performed by means of Abaqus software.Numerical simulation,the three-way load-time curve of the cutting head is obtained,which lays a foundation for the dynamic analysis of the whole machine.Then,the single-section section anchoring anchor unit under horizontal yaw cutting condition is taken as the research object.Based on the assumption and simplification,the X-direction eleven-degree-of-freedom dynamic model of the unit is established,and the Lagrange equation is used.Based on the energy method,the vibration differential equations of each component are listed to obtain the cutting head load as the excitation.The fourth-order Runge-Kutta method is used to solve the problem by means of MATLAB software.Through the analysis of the simulation results,it is found that the vibration amplitude of each component is large,which has a great influence on the stability of the surrounding rock of the roadway and the reliability of the key components of the unit,and the polarization of the inner support group components.Finally,the existing problems are analyzed,and a double-cutting section anchoring anchor unit is proposed.Based on the assumption and simplification,the X-direction four-degree-of-freedom dynamic model of the double-cutting section anchoring unit is established.The Z-direction eight-degree-of-freedom dynamics model is listed and its corresponding vibrational differential equations for each component are listed.The balance conditions and unbalanced conditions during the horizontal yaw of the unit are simulated separately by different excitation inputs.The X-direction dynamic equation of the double-cutting section anchoring unit is solved and analyzed.It is found that the X-direction vibration of the double-cutting section anchoringmachine assembly under two working conditions is compared with the single cutting section.The X-direction vibration of the anchoring unit is more stable and the unit has good working performance;Under the balanced working condition,there is no polarization problem in the double-cutting type excavation anchoring unit.Under the unbalanced working condition,the unit still has a certain polarization problem,but the polarization problem is compared with the yaw process of the single cutting section type anchoring anchor unit.Improvements have been made,indicating that the proposed double-cutting type tunneling mechanism can effectively solve the polarization problem existing in the transverse cutting of the unit.Through solving the Z-direction dynamic equation of the double-cutting section anchoring and anchoring unit,it is found that the vibration displacement of the components of the unit is small and the vibration is stable,which will not cause great reliability to the surrounding rock of the roadway and the key components of the unit.The effect of the support is good,indicating that the Z-direction structure design of the double-cutting section anchoring anchor unit is reasonable.Through the exploration of the vibration of each component under two horizontal yaw cutting conditions,it is found that the double cutting section type tunneling mechanism has a good application effect on the excavation anchoring unit,indicating that the double cutting section type excavating anchoring unit has Certainly feasible.