Structure Optimization Of Hopper And Conveying Pipe Of Concrete Pump Truck Based On Edem

Structure optimization of hopper and conveying pipe of concrete pump truck based on EDEMIn this paper,combined with the optimization design of the central pump and pipeline based on the analysis of concrete flow field characteristics of Xuzhou XCMG Schwing Machinery Co.,Ltd.,it focuses on solving the main problems such as the accumulation of materials in the hopper of the pump truck,the large swing resistance of the distribution valve,and the reduction of the resistance of the conveying pipe.Research on optimization of concrete pump truck hopper and conveying pipe structure.The optimization is carried out from two aspects of the structure of the hopper and the conveying pipe in the process of pumping concrete.The main work and innovations are as follows:（1）Accurate discrete element model and parameter verification of concrete pumping system.In this paper,combined with the rheological properties and component structure of fresh concrete,the Hertz-Mindlin with JKR Cohesion model of EDEM is used to construct particle flows of different sizes for the particle contact foundation of fresh concrete,and the slump experiment of C30 concrete is used to invert the particles.The flow parameters are verified by experiments and compared with the actual experimental data.The error of the slump between the simulated value and the measured value is 6%,and the average error of the slump expansion is 5mm.（2）Design and optimization of the hopper structure of the concrete pump truck.Focusing on the inner cavity surface configuration of the skirt valve and the S valve,the influence of the disturbance area of the swing valve swing trace,the disturbance area of the stirring blade movement trajectory and the opening area of the discharge port on the overall flow characteristics of the hopper was optimized and analyzed.The relationship curve between the changes of relevant parameters in different regions on the fluidity of material particles and the swing resistance of the distribution valve,the simulation experiments show that the above three regions show a coupled influence relationship.The skirt valve structure adopts the equidistant step structure,and the material flowability is better,and the size of the opening on the side of the discharge port is studied,which can improve the fluidity by 19.38%,and the S valve structure can improve the fluidity by 40.07%.（3）Structural design and optimization of concrete pump delivery pipes.The influence of the inclination angle,the length of the tapered pipe and the diameter of the tapered pipe on the tangential contact energy,the average tangential force and the average normal force of the pipe is mainly analyzed.The influence of the combination of bend radius on the contact energy of the pipe.The results show that increasing the inclination angle and the length of the tapered pipe of the alighting pipeline is beneficial to reduce the average tangential contact energy,average tangential force and average normal force.The two commonly used elbow radii of R180 and R275 are used as the elbow structure.The results show that increasing the elbow connection radius between the joint arms helps to reduce the average contact energy of the pipeline resistance.The inlet and outlet are the smallest.The combination of bending radii of R275 is the best.To sum up,the discrete element method is used to simulate the flow field of the fresh concrete batching plant and the concrete pumping process of the conveying pipe,respectively.The optimized hopper structure improves the material fluidity and reduces the swing resistance of the distribution valve.The optimization method proposed in this paper solves the optimization problem of the central pump and pipeline structure of the pump truck,and plays a guiding role in engineering practice.