Review on the development of the hottest vibration

2022-09-22
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Review on the development of vibration grinding and vibration crushing technology

vibration grinding technology

the earliest prototype of vibration grinding is a concentric multi chamber grinding, which was invented by German fasting company in 1910. However, the first vibration mill in the real sense was not manufactured by siebte-china until 1949. It is a single cylinder structure with a volume of 0.6L and adopts intermittent grinding. From the 1950s to 1960s, the vibrating mill developed into a multi barrel type, and its structure includes almost all the layout forms of 2~6 cylinders. The maximum volume of the equipment also exceeded 1000L. In 1962, the 65u type vibrating mill with eccentric body as exciter developed by German KHD and weuag companies was a model with large production capacity at that time, with an effective volume of 2000L and a product fineness of 43 μ The unit hour output of M (325 mesh) is 2.5 T/h and the power is 130kW. Relying on the advantages of output and fineness, its market coverage has reached more than 50 countries in a decade. This kind of vibration excitation method of grinding body vibration driven by the rapid rotation of eccentric body driven by motor, which was later imitated by all countries. Inspired by it, Lurgi company of Germany and South Africa also developed a centrifugal vibration mill by using the excitation method, and the grinding fineness can be less than 40 μ m。 At the same time, there are also air flow vibration mills and double cavity vibration mills with forced compressed air. Since then, the vibration grinding technology for the purpose of fine grinding has not only developed rapidly in Germany, especially the Palla type of Humboldt company and the 50U and 65u types of KHD company, but also become an important research content and application form in European and American countries

the chlmers single barrel vibration mill developed by American ails chaimers company in the mid-1950s has a barrel diameter of 0.5m, reaching Φ 1.03m, driven by double motors, with a maximum volume of 880l. Other types are mostly imported from Germany. Most of the vibration mills in the UK are produced by introducing German Palla type, var10 type and AUBEMA type technologies, and their application basically divides the main domestic market for ultra-fine powder processing

the former Soviet Union's research on vibration mills tends to focus on the large-scale equipment. Large volume vibration mills such as 2700l, 4000L and even 15000l, which were successively developed from 1952 to 1968, have been reported, and the effective volume has greatly broken through the international limitation of less than 2000L at that time. However, the industrial applications seen in the text are still only within 2000L, such as m.0 single barrel type, with a power of 70kw; M. 5. Double barrel type, power 150KW. In recent years, the technology introduced by some equipment manufacturing enterprises in China is the 2-cylinder model with a volume of 1000L

Japan began to carry out the research on its own vibratory mill technology on the basis of the introduction of technology from Germany, the United States and other countries in the 1960s, but the development speed is extremely rapid, and the quality and market are still in the leading position. Among them, the manufacturers of central chemical machinery, Yaskawa electric machinery and Kawasaki heavy industry have the largest production scale and the most famous products, such as CKC type, ch type, RSM type, VAMT, yasr, Yat type and the imported Palla type vibration mills, which enjoy a high reputation in the world. Generally, it is 250~1200l, but from the aspects of equipment performance, processing quality, noise and dust reduction and system matching, it reflects the progressiveness of technology and process integrity, so the market application rate is very high, covering all kinds of solid materials in the grinding industry. Domestic large enterprises such as Baosteel and Kailuan coal mine introduced complete sets of fine grinding equipment in the early stage

in 1965, the first domestic vibrating mill was developed by qianruzhong ball mill, huhuizhong, Wang Jiong, etc. of Beijing Building Materials Research Institute of the former Ministry of building materials through the establishment of mathematical models. It was the first three cylinder series structure with a volume of 30L and a power of 3KW. On this basis, Hefei Cement Research and Design Institute designed and manufactured the first 3-barrel SM 1000L vibrating mill for industrial production. The error of such experimental results can be imagined. It passed the ministerial technical appraisal in 1980. With its unique structure and adaptability to difficult to grind materials, it is widely used in the production of self stressing concrete cement, sawdust with acid, mica, corundum, silicon carbide and other powder rookie networks, together with 32 logistics partners around the world, to launch the "Green Plan", which is widely welcomed in the industry. Large and medium-sized enterprises such as Baosteel and Tangshan silicon carbide plant have shown superior fine grinding ability in grinding high hard materials such as corundum and silicon carbide by replacing foreign equipment. During this period, the market was unprecedented and enjoyed high popularity in China. So far, its 3-cylinder structure design and flexible coupling type are still the reference standards of the same type of vibration mill in China

the manufacturing and application of domestic vibrating mills reached a climax around 1985. According to simple statistics, there were more than 20 vibration mill manufacturing enterprises at that time, with a maximum volume of 1500L. Two structures of two cylinders in parallel and three cylinders in series coexisted. Vibration mills in Wenzhou, Zhejiang, Anqing, Anhui, Xinxiang, Henan, Hebi, Xi'an, Shaanxi and other places occupied their respective market shares. In 2000, the industry standard of vibrating mill products presided over by the Ministry of metallurgy began to formulate beneficiation equipment. Some enterprises introduced foreign technology to manufacture vibrating mills, which have also entered the market one after another. The equipment form and market structure of vibrating mills are more diversified

throughout the development of vibration grinding technology at home and abroad, the appearance characteristics are that the effective volume of the equipment is getting larger and larger, and the structure tends to be driven by multiple cylinders and single motor. However, the substantial progress lies in the re understanding and practice of the vibration intensity, that is, the acceleration of gravity by the developers, so that now the output of a large amplitude vibration mill can reach the production capacity of the previous vibration mill that is more than ten times the volume

the theoretical basis of vibration intensity ball mill. The vibration mills in the above countries are based on the theory of "grinding medium resonance" proposed by Bachmann in 1940. Their values are between 60~90m/s2 and the maximum amplitude is 8mm. This working state makes the horizontal vibration of the mill interfere with the vertical movement, so the production capacity is limited. The maximum output of 1000L vibration mill with larger specification is only 1.5t/h when the specific surface area is about 300 m2/kg. In the following ten years, the British Rhodes Se and bate, the Chinese Qian ruzhong, Hu Huizhong, Wang Ji and other people wrote articles and put forward different views on this theory. Se believed that the vibration intensity should be 50~70m/s2; Bate believes that the motion of the loose medium group of the vibration mill cannot be simplified into the motion of inelastic particles, and the grinding efficiency of increasing the amplitude is more obvious; Qian ruzhong and others believe that the vibration intensity must be a function of various factors including material properties. For example, the optimal vibration intensity for grinding sawdust with acid is 110m/s2. Although these views have been applied in their respective studies, the vibration intensity of industrial mills has not broken through the limitation of 100m/s2, and the grinding efficiency is still basically at the original level

some researchers try to improve the grinding efficiency of the vibration mill by changing the internal structure dynamics of the mill or by improving the external process conditions of the mill. German yer, mulish and Mei et al. Have carried out the test of introducing compressed gas into the mill to fully grind and quickly discharge the materials in the full agitation of the mill with the help of the air thrust, so as to shorten the residence time of the materials in the mill. The beneficiation equipment can obtain the maximum output per unit time, but the test effect is not obvious. When the air flow is small, the flow rate of the materials does not change much, However, if the air flow rate is too large, the particle size of the grinding products will become coarser, and it is difficult to find the best combination of the two. German gock et al. Invented a double zone vibrating mill and a rotating cavity vibrating mill from 1979 to 1986. The former is to add a compartment plate in the grinding cavity to make it become two grinding areas; The latter is to add an impeller device that can rotate with the medium in the grinding cavity. Its function is to activate the grinding body and eliminate the dead energy zone in the center of the grinding cavity, so as to achieve the purpose of strengthening grinding. Similar studies have also been reported in China. Beijing Guanghua wood mill, the Academy of Forestry Sciences and Tongji University added one along the length of the cylinder in the center of the SM vibration grinding cavity in 1968 and 1981, respectively Φ Using 61mm round pipe as intensifier, the test results have doubled the output, but the round pipe is seriously worn, and continuous operation requires higher materials. It can be seen that these improvements have not fundamentally changed the overall application effect of the equipment

the exploration of mineral processing equipment around the theory and practice of vibration mill has never stopped at home and abroad for decades. It was not until the early 1990s that a broad consensus was formed that increasing the vibration intensity and amplitude was the simplest and effective way to obtain high-efficiency grinding. This theory can be traced back to 1959, when M Л. Morgulis put forward the view that "vibration 2, model: wal (6) 00, wal1000, wal2000, wal3000 strength should be taken as 200 m/s2", and the development and practitioners began with Bernotat and wangshulin et al. They advocate that the vibration mill should be designed according to low frequency and large amplitude, because reducing the vibration frequency is conducive to prolonging the service life of the bearing, and increasing the amplitude can effectively improve the energy transmission and contact of the medium, and strive to build the brand area and forward extrusion collision ability of the park of "international deep-water port, circular economy zone, green new port city", so as to greatly improve the efficiency of vibration grinding. The practice of Table 1 provides strong support for their views, and constantly verifies its great practical value in production. (end)

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