Analysis of the Overseas Market Penetration of Low-Speed Centrifuges

　　 Low-speed centrifuge With the rise of China's centrifuge industry and the emergence of numerous high-quality centrifuge manufacturers, overseas markets have been steadily expanding. Thanks to several years of dedicated efforts, domestic low-speed centrifuges have gradually gained a foothold in overseas markets, making a significant contribution to the development of this segment. Today, China boasts a large number of centrifuge manufacturers offering a wide variety of models—everything from laboratory centrifuges to industrial ones—resulting in intense market competition across all segments. Yet, despite this robust domestic market, one might wonder: Does the fact that Chinese centrifuges now occupy a leading position in the global market mean that China’s centrifuge technology has reached world-class standards? The answer is no. Not only has China yet to reach the pinnacle of technological excellence, but there remains a considerable gap between China’s low-speed centrifuge technology and the internationally advanced level. While it’s true that certain low-speed centrifuges from China do rank among the world’s best in specific areas, overall, there’s still a noticeable gap to close.
　　The high-efficiency dewatering performance of low-speed centrifuges can only be achieved through a sophisticated automatic control system. Currently, the mainstream control method both domestically and internationally is PLC (Programmable Logic Controller) control. Almost all domestic manufacturers use PLCs as their central control systems; although these systems can meet basic control requirements, they still fall significantly short compared to foreign low-speed centrifuge control systems. Domestic centrifuge manufacturers rarely adopt large-screen displays—instead, they generally rely on LED digital tubes that display information line by line. To view the required operating parameters, users must constantly call up the relevant data, making operation cumbersome and limiting the available control functions. At present, only a very small number of domestic manufacturers have introduced advanced touch-screen display technology into the control systems of low-speed centrifuges, while also enabling connection to host computers, placing them at the forefront of domestic centrifuge control system development. Some overseas manufacturers’ low-speed centrifuge control technologies are currently several years ahead of those in China. In recent years, certain manufacturers have already begun using industrial PCs or DCS control systems—a decade ago—enabling far more extensive and powerful control capabilities than PLC systems. By adopting large-screen displays, all control parameters and operational statuses can be shown at once; menu-based operation provides a user-friendly human-machine interface, making the controls more intuitive and ergonomic.

                                                                                Low-speed centrifuge
　　The display screen of a low-speed centrifuge is one of the essential components that must be included with every centrifuge. The primary functions of the display screen are to show the current operating status, rotational speed, and centrifugation conditions, as well as to help operators perform visualized operations. If the display screen malfunctions... This issue would greatly inconvenience the operation of low-speed centrifuges and the execution of centrifugation experiments, making it impossible to monitor the centrifugation process and the operational status of the centrifuge in real time. As a result, experimental failures or damage to the centrifuge are likely to occur.
　　Select Low-speed centrifuge At this stage, the requirements for the filter cake are generally considered first—i.e., the machine model is initially selected based on factors such as the solids’ degree of dryness, washing efficiency, and the degree of solid particle integrity required. Subsequently, the suitability of the selected centrifuge is finally confirmed through intermediate-scale trials or actual machine tests.
　　If data on the requirements for suspensions and filter cakes are unavailable, they should be determined through experimentation. The rate of increase in filter cake thickness—the time required to produce a filter cake of a given thickness (in centimeters per second)—is a comprehensive indicator reflecting factors such as particle size, concentration, viscosity, and permeability. This rate can be measured using either a Buchner funnel or a blade-type test apparatus (operating at a vacuum level of 250–400 mm Hg). Under centrifugal force, the drying characteristics of the filter cake can be determined by testing with a small, low-speed centrifuge (with a rotor diameter of 150–300 mm) over a separation factor range of 500–1000. To perform the test, place a filter bag inside a perforated rotating drum, slowly add a known quantity of suspension, and maintain a thin layer of liquid on the surface of the filter cake. Then, the filter cake is squeezed to remove the mother liquor; if necessary, it can also be washed and finally subjected to centrifugal dewatering. When determining the drying characteristics, filter cake samples can be taken at different time intervals starting from the moment the liquid level on the filter cake surface disappears, and subsequently analyzed.
　　The most common drive configuration for low-speed centrifuges is the dual-motor system: one motor—typically a variable-frequency motor—directly drives the rotor via a belt, while another motor, through a gearbox (differential), drives the screw conveyor. In imported equipment, in addition to the commonly used dual-motor drive system, various other drive options are often available. The single-motor drive configuration involves one motor driving the rotor via a primary pulley, with a secondary belt driving the shaft of the differential, thereby generating a differential speed. Adjusting the speed differential in this type of centrifuge requires stopping the machine, making it a relatively simple drive method. Alternatively, in some designs, the input shaft of the differential is fixed, and the rotor is driven by a single motor. In the small, low-speed centrifuges described above, washing data can be obtained as follows: at the maximum filtration speed, careful washing using a flat-spray nozzle allows establishing the relationship between washing time and impurity removal efficiency.
　　The above regarding Low-speed centrifuge This brief overview is just the tip of the iceberg in the field of centrifuge technology. Therefore, we warmly welcome both new and existing friends to give us a call or visit our company for discussions and exchanges. Let’s work together to contribute our part to the development of the low-speed centrifuge industry!