Lightweight Design And Dynamics Simulation Analysis Of The Walking System Of The Distributing Machine

The factory production of concrete prefabricated components is an important part of the industrialization of construction.As the core equipment of the prefabricated component production line,the concrete distributor directly affects the efficiency of the production line and the quality of components.During the working process of the concrete distributor,as the concrete is poured into the hopper to the concrete in the hopper is gradually emptied,the walking system of the concrete distributor has been in the state of load-variable movement,and the study of its structural characteristics is of great significance to the optimal design and safe operation of the concrete distributor.The trolley in the walking system has the heaviest weight in the whole machine.It not only runs on the support beam as a moving part,but also acts as a walking beam of the trolley,bearing all the loads of the trolley,the distributor and the internal concrete.Excessive self-weight will lead to greater inertia of the walking system of the cloth machine,resulting in a large starting torque of the walking motor,unstable starting,reducing the position accuracy of the control system,and ultimately affecting the accuracy of the cloth.Therefore,the rationality of its structure is a prerequisite for the normal operation of the concrete distributor,and it is also the basis for a refined and stable distributor.In the walking system,the trolley starts instantaneously under heavy load,and the force and vibration response of the beam directly affect the mechanical properties of the beam,the motion stability of the trolley,and the uniformity of cloth.Therefore,the lightweight design and dynamics simulation analysis of the distributor’s walking system is of great significance for improving the performance and efficiency of the distributing machine walking system.The following main research contents are as follows:(1)Carry out three-dimensional modeling of the concrete distributor,simplify the model design of the distributor’s walking system in the finite element software,and make preparations for the simulation analysis of the distributor’s walking system through pre-processing methods such as grid division.Finally,the statics analysis of the walking system of the distributor under different working conditions is carried out.(2)Based on the existing structural parameters of the distributor’s walking system,the first two modal natural frequencies of the distributor’s walking system are calculated by the method of structural dynamics theory analysis,which provides a demonstration basis for the subsequent finite element modal simulation results.The finite element software is used to carry out modal analysis on the walking system of the distributor,and the first six natural frequencies and the modal vibration shape of the walking system of the distributor are obtained.Through the modal test on the concrete distributor experimental platform,the reliability of the finite element modal analysis results is verified.(3)The optimization analysis module in ANSYS analysis software is used to optimize the structure of the distributor’s walking system and realize the lightweight design of the distributor’s walking system.With the goal of reducing the weight of the car beam and increasing the first-order natural frequency,the sensitivity analysis table,the three-dimensional response surface and the final optimization result between the optimization variables and the optimization target are obtained.Finally,the optimization goals before and after structural optimization are compared and explained,and a set of optimal parameter combinations are obtained.(4)Carry out transient dynamic analysis and harmonic response analysis on the walking system of the distributor.First study the structural response of the distributing trolley when it starts instantaneously at the middle position of the girder under different loads and different acceleration conditions in the walking system of the concrete distributor,and then change the starting position of thetrolley to compare and analyze the structural response of the trolley when it starts instantly under heavy loads at different positions.response.At the same time,the harmonic response analysis of the concrete distributor under different positions and loads is carried out,and the resonance response of the the concrete distributor structure under a specific external excitation frequency is studied.