Analysis Of Driving Dynamic Characteristics And Track Plate Motion Of Anchor Excavators Based On Coupling Simulation

As a new type of coal mining equipment,anchor digger is widely used in China at present.In its driving process,because coal seam floor belongs to soft ground,the pressure of caterpillar on coal seam floor will lead to its destruction and deformation.The deformation of coal seam floor will in turn affect the driving performance of anchor digger,and the stability structure of coal seam floor may be destroyed when the pressure is too large.Therefore,it is necessary to carry out simulation analysis on the driving performance,ground specific pressure and bottom plate stress and deformation of the anchor digger.Moreover,since the anchor digger is not under ideal conditions when it is driving,it is necessary to consider the influence of different conditions on the dynamic characteristics of the anchor digger,which also provides a reference for the optimization design of the anchor digger in the later stage.The main research content of this paper is as follows:Based on the discrete element and multi-body dynamics simulation theory,this paper adopts the DEM-MBD two-way coupling method to simulate the driving of anchor digger on coal seam floor,establishes the model MB670-1 anchor digger and the Zhangjiao 5-2 coal seam floor model,and calculates its related parameters.A spatial model based on DEM-MBD coupling data is proposed to simulate the driving of anchor digger on coal seam floor.Combined with crawling-ground mechanics,the driving performance of anchor digger on coal seam floor,the stress of crawler system and the stress and deformation of coal seam floor are analyzed.It can be concluded that the driving performance of anchor digger on coal seam floor is better;The driving wheel,induction wheel and No.16 bearing wheel have a large force,so it is necessary to pay attention to the use of these three kinds of belt wheels in practical work.According to the pressure of anchor excavator crawler plate on the ground,the ground specific pressure generated when anchor excavator is running is calculated as 258 k Pa,and the distribution diagram of ground specific pressure is obtained.When the anchor digger is running,the force of coal seam floor is more uniform,the deformation is less,and the coal seam floor is more stable.In order to understand the influence of different working conditions on the anchoring machine running,the pre-tension force of the anchoring machine crawler,the position of the center of mass,the number of bearing wheels and the level of road roughness are changed,and the anchoring machine running on the coal seam floor is simulated,and the driving performance,the stress of the crawler system and the stress and deformation of the coal seam floor are compared and analyzed.It is found that the driving state of the windbreaker is better when the pretension force is 10%.When the road roughness is changed,it will affect the driving stability,offset and other performance of the anchor excavator,but the impact on the stress of the belt wheel is particularly serious.In addition,due to the increase of the road roughness grade,the local stress and deformation of the coal seam floor will increase,leading to its easier to be destroyed.Changing the position of anchor centroid will also have a certain impact on its driving dynamic characteristics.When the position of centroid shifts forward or to both sides,the driving performance of anchor digger will be seriously affected.Therefore,this phenomenon should be avoided in the working process of anchor digger.When the number of bearing wheels of anchor digger is increased,its driving performance will be improved to some extent,but its traction performance will be slightly decreased.In actual work,if the traction performance of anchor digger needs to be improved,a certain number of bearing wheels can be reduced.The above results can provide a theoretical basis for the optimal design of anchor digger.In order to understand the influence of different crawler plate parameters on the driving of anchor digger,the crawler plate parameters were adjusted from four aspects,including the width of crawler plate,the number of crawler plate,the shape of crawler plate and the load of crawler plate,and the DEM-FEM coupling simulation was carried out on the crawler plate.Based on the analysis of the subsidence and traction of the track plate,the stress and deformation of the coal seam floor and the stress and deformation of the track plate,the following conclusions are drawn:when the width of the track plate increases,the traction performance of the track plate will be improved to a certain extent,but when the width increases to a certain extent,the traction performance will be reduced.When the width of the track plate is reduced,its traction performance increases,but its subsidence and deformation also increase.Track plate shape will also have a certain impact on the driving performance of anchor digger.By comprehensive comparison,Ctype track plate has better driving performance and longer service life.When the average value of the mechanical load is the same,the type of load received by the track plate will not affect its settlement and average traction.In the simulation analysis of the track plate,the mechanical load of the track plate can be simplified into a constant load,so as to make a more intuitive comparative analysis.The above analysis results can provide a reference for the optimal design of track plate.There are 113 figures,9 tables and 57 references in this paper.