Filled foods have many advantages. They can be stored and circulated at room temperature, and they preserve the color, flavor, and nutritional value of natural fresh foods. The principle of filling foods is to rely on seal sterilization to achieve commercial aseptic requirements. Allow to add any preservatives. Canned materials are mainly divided into tin-plated steel sheets and aluminum materials. Since aluminum can-making cans have the advantages of light weight, odorless, non-toxic, easy to process, and recycling, they gradually become the mainstream of canned beverages, but at the same time, aluminum With low mechanical performance, it is necessary to inject safe inert gas into the tank during the canning process to enhance the mechanical strength of the tank and achieve the purpose of facilitating transportation and circulation. Online internal pressure detection machine is to use the characteristics of a certain pressure in the normal product tank to detect the internal pressure of the beverage can after sealed and sterilized in each line of high-speed online movement. It is not good for the sealing during the filling and sterilization process. Products (below the lower limit pressure) and products that may burst during the sales process (higher than the upper limit pressure) are given rejects to ensure that the product has good sealing performance and proper pressure inside the can before entering the package. Figure 1: Schematic diagram of the internal pressure detector The basic working principle of the internal pressure detection machine is as follows: After the product is sealed and re-sterilized, it is guided by the conveyor belt into the internal pressure detection machine. Two symmetrical soft belts clamp the “tested cans†forward and the cans are Through the force sensor, the internal pressure is transmitted to the force sensor in a moment, and the controller collects enough data points in a single tank to pass through one cycle of the force sensor to form a complete pressure waveform. These data points can be obtained through the algorithm. The internal pressure value of the can is determined by comparing the "high limit" and "low limit" parameters. Figure II: (above) VIPA 313-5BF13, (below) VIPA SLIO CPU015 The original control system is a dedicated controller that comes with imported equipment from Europe. The cost of spare parts is very high, and it is later converted into a famous German brand PLC system. The fastest internal high-speed interrupt is only 1ms, and it is limited by the speed of the arithmetic processing. The actual sampling period The fastest can only reach >3ms. The production line can barely reach a speed of 600 cans/minute. However, due to the small sampling point error, the reject rate of the reject device is high and the waste is serious. The internal pressure detection machine becomes the bottleneck of the entire production line. The efficiency of production does not increase, so JDB's technicians have been investigating PLC products that can meet the requirements of this application. They require: short module response time, fast analog conversion, short CPU sampling cycle, high computing speed, and low cost. high. After repeated argumentation and on-line experiments by both parties, VIPA 313-5BF13 truly achieved a sampling period of 1ms, increased the number of sampling points by nearly 4 times, significantly improved detection accuracy, effectively reduced the rate of missed hits, and drastically reduced waste; more gratifying, The VIPA SLIO series CPU 015 and high-speed signal modules are used to build the system. The sampling frequency can be increased by a factor of 4 compared with VIPA 313-5BF13. The backplane transmission rate, analog conversion time, and other technical indicators are also greatly improved. The system sampling period can reach 250 microseconds. Second, it can fully meet the needs of 1200 cans / minute production line. So far, the excellent performance of the VIPA 300S and SLIO series PLCs based on SPEED7 processor technology has been fully verified and gradually promoted in various JDB factories. Figure 3: Picture of Jiaduobao internal pressure detector At present, JDB has used VIPA's PLC control system on internal pressure testing machines at many factories. The efficiency of internal pressure testing machines has improved the production efficiency of the entire production line. With more and more testing machines, The selection of VIPA products will certainly have a far-reaching impact on enhancing the market competitiveness of JDB. More meaningfully, this application result can be fully extended to similar equipment manufacturers in the food and beverage industry. With the support of VIPA's SPEED7 technology, users only need to invest a lower cost, which can bring doubling benefits. The bottleneck that plagues the company helps the company enhance its competitiveness!
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