Order-driven High-precision Weighing And Control System Design For Powder Coatings

In the powder coating industry,it is necessary to feed and mix various raw materials to manufacture a certain product according to a certain weight ratio.The accuracy of the ingredients has a significant influence on the quality of the product.Therefore,studying a method to control the accuracy of the weighing and batching process is a reliable guarantee of product quality.In addition,in order to meet the current diversified and small-volume powder coating market demand,based on the full investigation of the current situation of the enterprise,a management and control system suitable for the enterprise characteristics has been developed,which comprehensively improves the production efficiency and comprehensive competitiveness of the enterpriseFirstly,this dissertation analyses the advantages and disadvantages of weight gain method,weight loss method and electronic belt scale weighing method,and proposes a production line weighting weighing method.The weighing and batching system measures the weight of the powder in the measuring bucket through the weighing sensor and transmits it to the PLC control system.The PLC control system determines whether the ingredients meet the accuracy requirements.The weighing and batching system can mix four kinds of powders with different characteristics online.What's more,the precision and efficiency can meet the technical requirements.Then,this dissertation uses the SolidWorks to carry out three-dimensional modeling of weighing and batching system,and designs the detailed mechanical structure of the weighing and batching system,then analyses the key parts in the mechanical structure through strength check and finite element analysis.Finally,according to the system control requirements,system pneumatic schematic and electrical control schematic are designed.Subsequently,the batching process of the weighing and batching system is described in detail.The factors affecting the precision of the weighing and batching process are studied.Finally,the iterative algorithm is studied and improved to reduce the influence of “air materials”.The result shows that the accuracy of the weighing and batching system is improved.Finally,this dissertation introduces the characteristics and workflow of the order-driven production method,and then introduces the functions of each functional module of the system.In addition,the development tool was selected to realize the design and development of the main function modules of the order-driven management system,What's more,a weighing and control system based on order-driven is established to realize the intelligent control of the whole process of weighing and batching at last.