Study On Mechanical Properties Of Combined Unit

In the process of coal mining,the roof caving accidents in the head-up area of the comprehensive excavation are seriously affected,which seriously affects the roadway driving speed and the safety of the workers.At present,the excavation and supporting technology of the fully mechanized coal roadway can not be closely connected,Stable support and poor ability through the roadway,it is difficult to adapt to coal mine safety and efficient excavation needs.In this paper,This paper combines the 2016 Liaoning Provincial Department of education key laboratory project(project number:LTZS006),proposed a set of excavation agencies,supporting institutions,coal loading institutions in a step Joint unit(hereinafter referred to as "excavation joint unit"),and its mechanical properties of the in-depth study.The main contents of this thesis are as follows:(1)This paper briefly introduces the background and significance of the research and discusses the research status of excavation and branching technology of fully excavated roadway and the research status of excavation and support mechanics.According to the requirement of temporary support of fully mechanized top-coal caving roof and the problem that the excavation and support can not be carried out synchronously to affect the efficiency of tunneling,a set of excavation mechanism,supporting mechanism and supporting mechanism are put forward.(2)Working Principle and Basic Parameters Determination of Equipment for Excavating Joint.According to the requirement of temporary support of fully mechanized roadway,the main structure,working principle and main characteristic of the equipment of the excavation unit are described,and the composition of the control module is determined.Technical parameters and machine technical parameters,as the basis for the study of mechanical properties of equipment for subsequent excavation joint.(3)Establishment of Static Analysis Model for Equipment Excavation.Through the analysis of the working principle and structural characteristics of the combined excavation unit,the mechanical model of the fully supported state and the excavation state is established by using the singular function method,and the longitudinal beam is calculated according to the deformation coordination principle The maximum compressive stress and maximum tensile stress of the beam,frame,column,side guards in the event of deflection are required and less than their allowable stress.(4)Application of ANSYS Workbench software to static analysis and modal analysis of excavation joint unit.According to the bearing principle of the structure of the combined excavation unit,the static distribution test is carried out under the specific conditions.The results show that the stress distribution cloud and displacement distribution of the combined unit under different load loading conditions are obtained.The structure of the excavation unit meets the requirements of static support.ANSYS Workbench software was used to analyze modal support in the double support and single support condition respectively.Through the simulation results,the natural frequency of the advanced support structure is obtained,and the natural frequency of the roof is analyzed.It can be seen that the structure of the excavation unit does not resonate with the roof.(5)Based on the theory of physics and simulation,based on the similarity theory of physics,the similarity criterion of the prototype and the experimental model prototype of the excavation unit and the main parameters of the experimental model prototype are established,and the experimental model prototype under the laboratory condition is established.The static experiment of the combined unit under different working conditions is studied and verified with the theoretical analysis results.