China is the world's largest producer and seller of instant noodles. Instant noodles are the second largest processed food in the world after bread. According to statistics, there are nearly 3,000 instant noodle production lines in China, with an annual production capacity of 19 billion bales and sales of 22.2 billion yuan. The output and sales have maintained an increase of more than 30%, far higher than the national food. The average growth rate of industry is 20.6%. The data show that with the adjustment of people's dietary structure and changes in eating habits, and the sustainable development of China's economy, it has brought good opportunities to the food packaging machinery industry, promoted the rapid development of the food processing industry, and required a large number of high-quality foods. Packaging machinery, the ultimate role of food machinery is to improve productivity and product diversification. 2. Fried instant noodles production process Fried instant noodles production process: Raw material mixing, mixing→curing→composite tableting→continuous tableting→cutting corrugation, forming→cooking gelatinization→cold cooling→cutting→folding→sorting→scenting→frying dehydration→cooling→finished product inspection→packaging → Finished packing. This article mainly introduces the last process of the instant noodle production line: the working principle of the automatic pillow packaging machine for sub-packaging. 3. How does the food packaging machine work? 1) Overview of food packaging machine: The application of high-tech technological achievements, the use of electromechanical integration, easy to operate, control programmatically achieved a perfect embodiment. Pillow-type automatic packaging machine is widely used and adaptable. It can be used for packaging of biscuits, instant noodles, candy, ice cream and other small foods. It can also be used for packaging of medicine, parts, textile, light and daily necessities. The total width of the packaging material can reach 450mm, and the package size can be freely selected in the range of long (95-350) mm, width (10-140) mm, and height (5-70) mm. Packing capacity is 30-200 packs / minute, power consumption: 4KW. Machine size: 5050 × 960 × 1800mm. 2) The composition of the electrical system: The power supply adopts three-phase five-wire system (or three-phase four-wire system) 380V/50Hz power supply, and the power consumption is about 5KW. The main system's electrical system consists of three parts. The programmable controller (PLC) and the speed sensorless vector inverter are the core control part and the heating control part. 3) Fully automatic pillow working principle a) heating system After the system is connected to the control cabinet, you can choose to heat it. The heater uses a 48 volt safe voltage. After setting the required heating temperature, it usually takes about 20 minutes to reach the set temperature. b) operation and speed setting According to the operation mode, the programmable controller can select manual and automatic operation. At this time, the “POWER†and “RUN†indicators on the PLC unit are on. After adjusting the film and packaging (convenient surface block), set the operation mode switch SA2 to the "automatic" position, set the tracking switch SA3 to the "automatic" position, press the start button SB2, and the longitudinally sealed electromagnet YA1 is engaged and operated. The alarm is energized for about 2 seconds and the machine is running continuously. The host uses KV2000 speed sensorless vector inverter for speed regulation. The operating keyboard of the inverter is installed on the operation control cabinet, and the speed adjustment is realized by the panel potentiometer R1. The speed of the motor is displayed on the operating keypad of the inverter. Speed ​​Rpm = (120 × F057 output frequency / F052 motor pole number) × gear ratio. When the factory is out, the relevant parameters have been set, and the user generally does not want to modify the parameters. c) Differential mechanism and bag length adjustment machine for pillow type automatic packaging machine (omitted) d) tracking system The tracking system is the control core of the packaging machine and is controlled by the PLC program (see some main PLC tracking programs). The system can be accurately positioned according to the shape and size of the packaged items, and the forward and reverse two-way tracking is used to further improve the tracking accuracy. The errors in the production process of the packaging materials are found in time, and the compensation and correction are accurately given to avoid the waste of packaging materials. After the machine is running, the film mark sensor continuously detects the film mark (color mark), and the mechanical part of the tracking micro switch detects the position of the machine. The above two signals are sent to the PLC. After the program operation, the output of the PLC is Y6 ( Positive chasing), Y12 (anti-chasing) control tracking the positive and negative tracking of the motor. If the technical requirements are not met after the predetermined number of times of tracking, the test can be automatically stopped for inspection to avoid the generation of waste products. e) Requirements for frequency adjustment of food packaging machine Although the transmission function of the food packaging machine is relatively simple, it has high requirements on the dynamic performance of the transmission, and the system requires fast dynamic following performance and high speed stability. Therefore, the dynamic technical specifications of the inverter must be considered, and high-performance inverters can be selected to meet the requirements. f) Features of KV2000 speed sensorless vector inverter 1) Apply speed sensorless vector control technology, with automatic tuning function, automatically correct the frequency to achieve the effect of stable motor speed when the load changes; 2) It has high steady speed accuracy and fast dynamic response, which can meet the transmission control requirements of high performance applications. Reduces time and economic losses due to driveline failures. At the same time, the speed sensor is omitted, which has lower maintenance costs. 3) It has the advantages of rich functions, stable performance, miniaturization and low noise operation. g) In the peripheral circuit of the KV2000 inverter, it is mainly composed of six parts. 1) DC braking resistor terminal P+, DB external braking resistor R0; when the system is parked, realize instant safe parking; 2) In the control loop input terminal, FWD/REV is the forward/reverse signal, wherein FWD receives the Y0 output signal from the PLC, and the inverter runs forward at the set frequency; X1, X2, X3, X4, X5, X6 are Custom multi-function input selection terminal, wherein X1 receives the jog signal from PLC program control output Y1, and the inverter realizes jog operation; 3) The frequency reference is set by the potentiometer R1 installed on the electric control cabinet, which is convenient for the on-site operator to adjust the speed according to the production needs; 4) In the output of the control loop, TA and TC are the fault output terminals of the inverter. When the inverter is faulty, the input signals COM and X10 of the PLC are closed, and the program control system alarms and stops automatically. 4 Conclusion Pillow type food packaging machine uses speed sensorless vector frequency conversion speed regulation, which has the following advantages: 1) Simplify the transmission system, improve the stability and reliability of the machine operation, reduce the noise of the machine operation, greatly extend the service life and minimize the failure rate, and reduce the maintenance cost of the enterprise. 2) Increase production and reduce costs. It can improve production technology, improve product output and quality, and effectively save costs and maximize profits. 3) Achieve high efficiency, low loss, automatic detection and other functions of the packaging machine. 4) Through the functions of torque boost, stall prevention and restart, the non-tripping operation is realized; the product quality is stable and the efficiency is improved.