Study And Realization Of Control System Of Weighing Combined Balance Based On Programmable Logic Controller

Along with the development of electronic weighing technology, the traditional single scale weighing already can not meet the requirements of high precision and rapid speed measurement, especially for the weighing irregular shape and quality uneven items, The faults of this scale has become increasingly evident. These problems had been solved as the appearance of the computer combination scale.It use combination weighing principle and improves the accuracy of weighing and measuring speed, it aslo improve the production efficiency and butter the labor. However, the number of the bucket of combination scale On the market at present all above10, which not only large in the scale but on the cost, For peanuts in small market, this kind of equipment is not only difficult to move but higher in cost, so a type of small size and easy to move is need in urgency. This kind of combination scale not only ensure the measuring accuracy requirement, but also in the speed is better than that of artificial packaging, This undoubtedly will have good market application and popularization value.Finally, innovation on the origina equipment, the paper design out one type small intelligent weighing combination scale with high precision, small volume, convenient to move based on the existing large combination scale. The weighing system still use combination weighing principle, the multiple weighing bucket number is reduced to four to narrow the whole scale body volume. But in order to ensure the measuring accuracy in each combination, the bucket total needed in participate in combination each time are made sure not too little, in the scriptures argument for at least8, a row of corresponding numbers memory bucket are need below the weighing hopper, The four memory bucket used to store weight that weighing hopper had weight, while the weight temporarily stored in the CPU of Programmable logic controller. Finally they and top of the four weighing hopper together constitute a eight bucket,thus combined into common target weight effectively.In this paper, system working principle and technological process had been introduced firstly, And a detailed introduction had been made for the system framework of the machinery, especially clarify the weighing hopper and memory bucket structure and action process. Then according to the judgment for working principle of combination scale and combination probability, The mathematic model had been made for the argument and interpretation, It is concluded that the combination weighing has many advantages when compared with single scale weighing, it is also concluded that the system technical indicators all meet the require when it has8hoppers in total. In view of these indexes, for the most important thing, The paper makes a theoretical analysis and And a motion simulation had been made based on WINCC configuration software, for these indexes, both of them had been made for analyzed and optimized, Finally found a solution and obtained satisfactory results. The design for the system of the electrical structure had been made in the end of the paper,including electrical element selection, hardware connection, oftware design and power on work between them and communication had been finished too. From the design to the analysis of last result, The whole project Comprehensive demonstrates the feasibility of the small intelligent weighing combination scale, principle had been provide for small combination scale development, For the measurement need of the packaging of small and medium-sized provides users with a convenient.