The automatic control of the extrusion process refers to the purpose of quickly and accurately controlling the process parameters by providing a computer-aided control system for the extrusion equipment. The application of self-control technology in the expansion process not only improves work efficiency, but also improves product quality stability.
Research on automatic control models at home and abroad. The application of fuzzy logic in the establishment and control of the model of extrusion and aging has been studied abroad, and the neural network with output feedback and time delay is applied to control the process of producing a small rusp in a twin-screw extruder. Very good results. Wang Yude et al. (2004) studied the effects of screw speed, feed rate, water supply speed and barrel temperature on the expansion effect by using a mixture of corn and wheat as raw materials, and established a BP neural network model to achieve process parameter control and target. The forecast of the output.
The automatic control technology of the expansion process in China has made great progress, and a visualization control system for the expansion process has been developed. The expansion system based on FIX industrial configuration software realizes the visual control of the puffing process. The sensor can perform on-site detection and feedback on the operating parameters of the puffing machine, automatically adjust the relevant working parameters of the puffing machine, and realize the pre-set work of the operator. Parameters, with recipe storage, report printing, alarms, dynamic display of working parameters and recording functions.
Foreign computer automatic control technology has long been applied in the field of feed processing. In the whole feed processing process, it has been developed from a single computer control to an advanced automatic control system, which can display color images, computer program control and machine operation communication network in the central control room. All production processes can be completed without human operation. In the United States, the automatic control of the food expansion process is closely integrated with the product's puffing effect. The puffing system consists of a puffing machine, a raw material feeding device, a dryer and a control device. The analyzer is installed at an appropriate position, the analyzer is connected to the control device, and the control device is connected to the puffing machine, the raw material feeding device and the dryer. The analyzer is used to measure the important parameters of the imported raw materials and the final expanded product, and generate analytical signals [ultrasonic, NIR (near infrared spectroscopy), microwave, etc.], and then pass it to the control device, and the control device receives the signal and then controls the puffing machine. Its working parameters are adjusted to meet the requirements, and real-time system operation control is provided through feedback.
In general, the automatic expansion control of feed processing in foreign countries has been developing in the direction of combining product quality. The introduction of computer in China mainly solves the problem of production automation, focusing only on the monitoring of equipment operation and the control of single equipment. It has not played its due role in improving product quality. The communication network has been applied to the expansion process control in foreign countries to realize the sharing of system information resources. In the future, the automatic control of China's expanded feed production should focus on the application of communication networks to the production process, focusing on the development of the combination of quality control.
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