| Bundling is the last process of steel coil production,which directly affects the storage and transportation safety and appearance quality of steel coil.Domestic research on bundling technology started late,bundling equipment market is basically monopolized by foreign countries.At present,the coil circumferential bundling usually adopts the narrow strip multi-channel bundling process.Due to the uneven force,the bundling belt often breaks.In order to solve this problem,we propose a single-channel bundling method of wide steel strip(50mm),namely heavy load bundling.Heavy load baling puts forward higher requirements for belt conveyor mechanism of baler.In addition to providing greater tension,it also solves the problems of deformation and wearing difficulty of wide banding steel strip.In this paper,the research on the above related issues is of great significance for the realization of heavy load baling and breaking foreign technology monopoly.According to the process requirements of steel coil baling,the structural design of the conveyor mechanism of heavy-duty baling machine was carried out.The conveyor mechanism was composed of the friction wheel drive mechanism,the narrow strip straightening mechanism and the belt guide groove.The driving mode of the conveyor mechanism was determined,and the Solid Works software was used for3 D modeling.Based on the characteristics of the feeding process of the baler,a selfcompression friction drive mechanism with self-boosting characteristics was designed.The degree of freedom and force analysis of the mechanism are carried out to determine the non-slip condition of the mechanism;taking the minimum stress of driving wheel,supporting wheel and strap as the optimization objective,the structural parameters of the mechanism are optimized,and the optimal solutions of the parameters such as the diameter of driving wheel,the length of connecting rod and the inclination angle of connecting rod are obtained.Based on the optimization results,the detailed structural design of the friction wheel drive mechanism was carried out.According to the straightening principle,the roll diameter,roll distance,roll length and roll gap of the straightening roller in the straightening mechanism are analyzed and determined.The bending moment and straightening force of each straightening roller are calculated,and the parameter design of the narrow strip straightening mechanism is completed.The straightening effect of the straightening mechanism on the strap under the actual working condition is simulated by ABAQUS software,and the maximum unevenness of the strap after straightening is solved.By comparing with the relevant standards,it is obtained that the straightened strap can meet the needs of strapping,which proves the rationality and practicability of the design of the strap straightening mechanism.According to the actual demand of binding process for the function of guide groove,the structure of guide groove is designed,and the virtual assembly is completed by Solid Works software.According to the method of analyzing the instability of the compression bar in material mechanics,the straightened strap is analogized to a slender bar,and the minimum driving force for the strap to pass through the guide groove is calculated.The strap at the corner is analogized to a cantilever beam with a certain length.According to the deflection curve equation,the minimum curvature radius of the guide groove at the corner is calculated,which provides a theoretical basis for the actual structural parameters of the guide groove. |
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