Cutting Dynamics Analysis Of Shearer Trial Cutting Drum

This paper focuses on the research background of coal-rock identification of the shearer's trial-cut drum,and takes the shearer's trial-cut drum as the research object.In order to solve the problems of low coal-rock identification efficiency and passive coal-rock identification method,a trial-cut drum is proposed based on the similarity theory The method of identifying the coal-rock interface,through a combination of theoretical analysis and numerical simulation,has conducted a detailed study on the cutting force generated when the single-piece trial cutting drum and the spiral trial cutting drum cut coal rock walls with different rock contents.Based on the MG300/700-QWD shearer,based on similar theory,the trial cutting drums with diameters of 300mm,450mm,600mm,750mm and 900mm were established,and the three-dimensional model of single-piece and spiral trial cutting drums was established through SOLIKWORKS,And using Hypermesh,LS-Prepost and LS-DYNA software for finite element analysis.The cutting force obtained by cutting coal and limestone with different cutting depths by a single pick is compared with the calculation results of Evans theory model,Roxborough theory model,Goktan theory model,Gao Kuidong model and Li Xuefeng model.The cutting force of the single-piece trial cutting drum found that when the diameter of the drum was fixed,the average cutting force and peak cutting force of the single-piece trial cutting drum increased linearly with the increase of the diameter of the drum.When the rock content was fixed,the single-piece The average cutting force of the trial cutting drum increases exponentially with the increase of the drum diameter,while the peak cutting force increases linearly with the increase of the drum diameter.However,there is a certain gap between the cutting force of the spiral trial cutting drum and the single-piece trial cutting drum.When the diameter of the drum is fixed,the average cutting force and peak cutting force of the spiral trial cutting drum increase linearly with the increase of the diameter of the drum.When the rock content is fixed,the average cutting force and peak cutting force of the spiral test cutting drum increase exponentially with the increase of the drum diameter.The minimum difference between the average cutting force and the peak cutting force of the single-piece test cutting drum and the spiral test cutting drum is the cutting force when the 300mm diameter test cutting drum cuts the rock content of 10%coal wall,They are 0.1kN and 0.77kN,respectively,and the maximum gap is the cutting force when the diameter of the 900mm trial cutting drum cuts the coal wall with a rock content of 50%,which is 3.73kN and 20.81kN,respectively.The minimum difference between the average cutting force and the peak cutting force of the single-piece test cutting drum and the spiral test cutting drum is the cutting force when the 300mm diameter test cutting drum cuts the rock content of 10%coal wall,They are 0.1 kN and 0.77kN,respectively,and the maximum gap is the cutting force when the diameter of the 900mm trial cutting drum cuts the coal wall with a rock content of 50%,which is 3.73kN and 20.81kN,respectively.