How to solve these difficulties in powder material transportation? Some professional powder engineering companies in the world mainly adopt positive pressure conveying+counterweight tank, screw metering counterweight+negative pressure conveying, negative pressure conveying+batching tank. Negative pressure conveying+batching tank is a new combination mode adopted by many foreign enterprises in recent years. Through the linkage between the metering instrument on the counterweight tank and the negative pressure conveying equipment, many problems existing in the conveying process of powder materials are effectively solved, and the PLC whole-process control system is adopted, which has the advantages of low energy consumption, low cost and low maintenance. Equipped with measuring instruments with high measurement accuracy, it can not only complete the tasks of accurate measurement and batching transportation, but also effectively protect the environment.
As far as metering and batching is concerned, because most enterprises adopt manual batching and feeding methods, it is easy to cause dust flying, pollute the environment, affect the health of operators and restrict the development process of enterprise modernization. The combination of positive pressure transportation and counterweight tank, which is widely used in chemical industry, has the advantages of large transportation capacity and long transportation distance, and can be used for continuous logistics transportation and high-speed transportation of objects, but it cannot solve the phenomenon that materials accumulate and block the transportation pipeline. At the same time, the quality of the pipeline is also very high, which should be wear-resistant and anti-static. The equipment is complex, bulky and difficult to install. Due to the serious wear and tear of materials and equipment, the investment and operation cost of equipment are relatively expensive. Relatively speaking, the spiral weighing method has more technical advantages. The screw metering device has high metering accuracy, and there will be no material blockage in the conveying process. It is a commonly used measurement and transportation method in food and fine chemical industry. But the disadvantages are inconvenient installation and difficult cleaning. The vibrating conveying metering mode ensures a large conveying capacity and a certain metering accuracy. Because the equipment occupies a large area, it is not easy to install, the transportation distance is greatly limited, and its use is also greatly limited.
At present, the largest ice cream automatic batching and conveying production line in China adopts the new technology of vacuum conveyor and batching tank, which integrates many functions such as automatic metering, automatic batching, automatic conveying and automatic mixing, and is centrally controlled by the central control system, effectively solving the problem of how to mix and measure various materials, and completely eliminating the double pollution of dust easily produced in this process to the environment and materials. Because the batching and metering and conveying take place in the last working procedure before mixing, it not only reduces the system error, but also effectively ensures the product quality. The successful operation of the system has played a very good role in promoting the wide application of the fully enclosed automatic batching conveying system.