【正文】 extensive, field can take the scheme is more agile diversity, and, due to the system often costly, users of the actual conditions are also different. Therefore, careful, choose a reasonable, perfect, economic solution appears especially important.The structures of the belt scales ingredients consists mainly of transmission mountings, weighing transducer speed sensor, scale, active roller, driven roller, conveyor belt conveyors, drag, adjusting devices, equipment etc. When the scattered in conveyor belt scale body through the material on the weighing scale body, the speed sensor and sensor signal and the weight of millivolt belt speed pulse signal through the junction box to strap balance meter.The overall design philosophy of the Automatic batching and weighing system of the belt is: Before the belt conveyer is put into operation, the settlement value of the flow of the supplies is established on the keyboard by the attendant to carry on the belt. After the system is put into normal running, loading signal of the belt that the onechip puter samples and the speed signal leaves, walk belt speed signal and belt instantaneous weight, unit of length is it can calculate out belt twinkling of an eye flow F of supplies to multiply (t) . The flow can be in charge of the number and show, offer the craft data to attendant to consult in the twinkling of an eye. 8031 systems and then pare the actual value of the flow instead of the establishing value, calculate out controlling amount vi after PID regulates operation, and then change into the electric current and output the signal, and then enlarged and controlled leading the open angle of silicon controlled rectifier, realize regulating the function of the electricity electromechanical magnetism clutch excitation electric current of slippery difference, thus regulate the rotational speed of the slippery difference electrical machinery of executive body, enable transporting the flow of supplies on belts to stabilize in the adjacent place of settlement value as much as possible, have a good static index and dynamic performance.Automatic batching and weighing system is widely applied in industrial and agricultural production and social life in all areas. Especially the metallurgy, coal, chemicals, cement industries, often need to spread in the dynamic process of belt conveyor, and continuous weigh on conveying the flow adjustment and control, accurate ratio.The quality control of ingredients directly relates to the enterprise can produce smoothly. If the quality of pound reach requirements, causing a waste of energy, raw materials, while influence the quality of the products and productivity, and some of the important position of the ingredients for the production of mistakes even a accident. Therefore, the high precision and ingredients and how quickly the whole manufacturing restricts the product quality and yield response, so the quality and yield of pounding process control give enough attention. Electronic says automatic batching system can be set according to the input ratio and flow control of material flow, thereby achieve control of product quality and yield of the objective is to realize the automatic production process and intelligent, enterprise39。s scientific management, safe and stable production and energy consumption is the important technical means. Computer control system in the production of ingredients used not only can improve the yield and quality ingredients and greatly reduce the labor intensity, and post to improve production efficiency. Because the system of production lines, with the same ingredients and posed of daytime belt says system for example. This system mainly consists of ingredients, instrument, electronic control frequency, industrial control puter cabinet, and monitoring and management software.1) Ingredients electronic saidIngredients of electronic belt say the bulk materials through belt of automatic weighing and continuous accumulated transportation and measuring two functions. Weighing part adopts resistance strain working principle, structure。 roller leveraged practical work, belt constant velocity measurement called by feeding speed regulating superior to change the material flow, this type of enterprises with more than say for production process control.2) Meter controllerInstrumentation control including daytime belt says, each instrument meter from receiving belt says the weight of the weighing transducer speed sensor signal and the changes of the belt speed pulse signal, calculate flow and accumulation. And will flow signals in 420 ma simulation current form, workmanaging machine will flow for industrial puter signals and machine after parison, according to a certain value of output control rule 420 ma adjusting control signal, feeder, forming a single speed closedloop control certain material flow, achieve the goal.3) Inverter arkArk of the converter, the dynamic control switch from higher feeding motor control signalsThe rev. Stop, simultaneously also accept four ^ from polymerizingkettle 20 ma adjustment, to change the output signalPower supply of frequency, and control site 7 feeder speed. If the inverter power,To configure the cooling fan, to ensure the converter can work normally.4) Industrial control puter and softwareHuaShuo use polymerizingkettle IPC 610 14 industrial PC chassis frame 6179L length, configuration PCA 512M memory and CPU card, with 80G hard disk, a PCL 746 + 4 ports RS232 \ \ 485 munication interface card 422, 24 1720U type PCI simulation output channel segregation, workmanaging machine as PC, through twoway munication interface RS485 with belt says, through RS232 instrument online munication interface with dynamic twoway the PLC control, analog output online control signal control feeding machine to flow, which constitute a plete system of the ingredients. Other vital industrial puter interface RS485 twoway munication, to prepare f