Separation machinery is a device that separates a mixture of liquid and solid particles, mainly divided into centrifuges, separators, filter presses, oil filters, filters and other equipment. Separation machinery is generally the post-processing equipment in the process, so it is directly related to the quality of the final product. On the whole, there is a big gap between China's separation machinery technology level and foreign advanced level. The main performance is that: the separation machinery has few varieties and specifications, which cannot fully meet the domestic production needs, especially the machinery with high viscosity and fine precision of the separation material, and the vast majority of separation machinery with high efficiency, large production capacity and high degree of automation rely on imports; separation Research on mechanism and application technology is backward, new product development is slow; backward manufacturing process, low production efficiency, poor product reliability and stability, low technical level and automation level; supporting equipment and materials cannot meet the needs of separation machinery product production , Especially the quality and reliability of the product is very unstable. From the perspective of the development of separation machinery, digital AC inverters will replace the original electromagnetic speed regulation, DC speed regulation, hydraulic coupling speed regulation, and multi-speed motors, and gradually become the main driving device of separation machinery. This article will introduce the design and application of ABB's new ACS550 inverter in separation machinery.
ACS550 is the latest intelligent frequency converter introduced by ABB. This series of frequency converters are used for 0.75KW ～ 355KW low voltage AC drive. It can accurately control the speed and torque, and can match the existing standard squirrel cage asynchronous motor. ACS550 has three control methods, namely scalar V / F control, sensorless vector control, and torque control, so this inverter can not only be suitable for the simplest motor operation, but also can be applied to complex work occasions. Its reliable overload capacity design can also meet ordinary load and heavy load work. The drive motor of the separation machinery is generally divided into two types: single motor drive and multi-motor drive. This article will mainly introduce the application of the ACS550 inverter in the three-legged centrifuge as a typical case of single-motor drive and the typical case of multi-motor drive. Application of screw centrifuge. 2. Application of frequency converter in three-legged centrifuge The three-legged centrifuge is a vertical centrifuge with simple structure, strong adaptability to materials, and the widest application. It is divided into two types: sedimentation type and filtration type. The most widely used is the filter-type three-foot centrifuge. It can be suitable for separating fine particles with a particle size of only a few microns, and can also be used for deliquoring of finished items. By adjusting the duration of each operation process, it can be used to separate various suspensions with different degrees of difficulty. By adjusting the washing time of the filter cake, it can meet different washing requirements. This type of machine is mainly suitable for small and medium-sized production scale, but because of its many advantages, it is widely used in pharmaceutical, chemical, light industry, textile, food, machinery manufacturing and other industrial sectors. In this application, the frequency converter drives the drum of the centrifuge, which starts smoothly and the separation factor is adjustable; it completely overcomes the shortcomings of the traditional DC carbon brush centrifuge such as high noise, high failure rate, short service life, unstable speed , Is a new product of gravity settling separation equipment. The AC variable frequency centrifuge has distinctive characteristics and originality in several important indicators such as shock absorption system and variable frequency motor. The common three-legged centrifuge has a stand-alone drive power between 3KW and 55KW, and the ACS550 is fully capable.
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