The weighing and unloading system adopts four storage bins with ABCD raw materials. When the machine starts to work, the metering valve of A material opens and A material falls into the weighing hopper. When the weight sensor in the weighing hopper senses that the weight reaches the preset value, the A metering valve is closed and the B metering valve is opened. In such four cycles, when the four raw materials fall into the weighing hopper and the weight reaches the preset value, the weighing hopper closing valve opens.
020-34563445The feeding system uses frequency converter to control the feeding speed of the magnetic vibration Feeder, and the material is poured into the weighing hopper through the feeder. When the feeding equipment stops acting, there is still a part of the material in the air that does not fall into the weighing. Through the analysis of the batcher system, the mathematical model is established as follows. Parameters involved in the model, such as the diameter, height of the hopper and parameters of the feeder, can be measured, but the bulk weight of the material, that is, the weight per unit volume of the air column, cannot be determined and will vary with the temperature, humidity and material. Therefore, the traditional PID control cannot meet the requirements of high precision. The ant colony algorithm is introduced on the basis of PID control. The ant colony algorithm is a bionic algorithm derived from the natural biological world based on the bionic evolutionary algorithm. It has obtained good results on many optimization problems, has good robustness and flexibility of the algorithm, and can be easily applied to other problems that can be expressed as optimization on the graph. Therefore, the PID control can be optimized by ant colony algorithm to dynamically adjust the control parameters.
The field controller of the feeding system is controlled by S7-200PLC, and the output control quantity controls the feed system fast and slow feed, the start and stop of the feeder, the switch of the bin door, and other related control switch actions. In addition, it accepts the relevant dosage sent by the upper computer, and the asynchronous machine accepts the control instruction sent by the PLC to adjust the motor speed of the electromagnetic vibration feeder. To achieve variable speed feeding. The weighing sensor is used to measure the weight of the material in the weighing hopper in real time, and the weighing sampling interface is used to filter, amplify and convert the weighing signal of the weighing sensor into a digital signal before sending to the CPU. It mainly includes filter, amplifier, A/D converter and control command register.
