Research Of Digital Platform For Double-toothed Roll Crusher And Its Transmission System Based On Discrete Element And Finite Element Coupling

Aiming at the problems of complex design process,long design cycle and high design cost of double teeth roll crusher in mobile crushing station,this paper combines the key scientific research project of Shanxi coal-based "Key Technologies Research of Large Mobile Crushing Station(MJ2014-02)" and the "Mechanical-Electrical Coupling Dynamics and Self-adaptive Control of Multi-Track Traveling Device(51775225)" of the National Natural Fund for mobile crushing station.The research and analysis of the digital platform of the double-tooth roll crusher and its transmission system are carried out.On the basis of consulting relevant literature at home and abroad,the research status of crushing theory,crushing technology and reliability optimization design of gear transmission system is summarized.According to the working principle and structural characteristics of the double-tooth roller crusher,a parametric modeling platform of the double-tooth roller crusher is built by using Visual Basic 6.0 as the secondary development tool of SolidWoks,and the production capacity is preliminarily calculated according to the geometric model size parameters generated.The results show that the design requirements are satisfied.Using the generated geometric model as the research object,the mathematical model of material crushing suitable for double tooth roll crusher was established.The particle size distribution of the crushed material is calculated by introducing the particle size distribution of the material into the model,which meets the design requirements.The results show that the particle size distribution of the crushed material meets the design requirements very well.The condensation parameters of the material model were calibrated by uniaxial compression test and Brazilian disk test,and the discrete element simulation model of the double-tooth roller crusher was established in EDEM with the calibrated parameters.The production capacity of the simulation model is extracted,and the results show that it meets the design requirements of the production capacity.The force acting on the gear roll is extracted and analyzed,and the breaking power is calculated by the conversion formula,which is in good agreement with the theoretical calculation results.The force of different roll teeth of the same gear ring is extracted and analyzed.It is found that the peak load of each roll tooth is very close,and the position of the roll teeth under the peak load is almost the same(the position angle of the roll is between-1 degree and 1 degree),basically all in the middle of the plane where the axis of the two rolls is located.The EDEM-ANSYS Workbench coupling simulation model of gear ring is established.Load,stress,strain and deformation nephograms of different rollers of the same gear ring are extracted and analyzed.The design requirements of strength and stiffness of roller teeth are met from the results.A set of reliability calculation program for bevel gears with different tooth profiles is compiled.The reliability optimization design of bevel gears transmission system is carried out by genetic algorithm.The whole reliability optimization calculation process is compiled into program code by using MATLAB software,and finally the program file is packaged and generated.Taking the bevel gear of double-tooth roller crusher designed in Chapter 2 as an example,the reliability optimization calculation is carried out,and the results are compared with those of the simulation in Chapter 3.The results show that the optimization results of the latter have more practical reference value.Finally,Monta Carlo's method for calculating gear reliability is introduced,and the reliability obtained from the above optimization results is verified and analyzed.In this paper,a design platform for parametric modeling of twin-tooth roll crusher is built,and the mathematical model of crushing material of twin-tooth roll crusher is established.Based on DEM,the discrete element simulation model of twin-tooth roll crusher is established.The strength and stiffness of roll teeth are checked and analyzed by EDEM-Workbench coupling simulation,which provides a reference for improving the design of twin-tooth roll crusher.This paper uses the Graphical User Interface(GUI)of MATLAB to build an analysis platform for the reliability optimization design of bevel gears,which provides a new design idea for the design and reliability optimization analysis of the gear transmission system of double-tooth roller crusher.