外文翻譯--在非圓柱輥式破碎機(jī)中粉碎-展示頁(yè)
2025-01-16 09:20本頁(yè)面
【正文】 of nip, enabling the NCRC to achieve higher reduction ratios than conventional roll crushers. Preliminary tests with a model prototype have indicated that, even for very hard ores,reduction ratios exceeding 10:I can be attained (Vellelri and Weedon, 2022). These initial findings were obtained for single particle feed. where there is no significant interaction between particles during minution. The current work extends the existing results by examining multiparticle minution in the NCRC. It also looks at various other factors that influence the performance of the NCRC and explores the effectiveness of using the NCRC for the processing of mill scats. PRINCIPLE OF OPERATION The angle of nip is one of the main lectors effecting the performance of a roll crusher. Smaller nip angles are beneficial since they increase the likelihood of particles being grabbed and crushed by the rolls. For a given feed size and roll gap, the nip angle in a conventional roll crusher is limited by the size of the rolls. The NCRC attempts to overe this limitation through the use of profiled rolls, which improve the angle of nip at various points during one cycle (or revolution) of the rolls. In addition to the nip angle, a number of other factors including variation m roll gap and mode of minution were considered when selecting the roll profiles. The final shapes of the NCRC rolls are shown in Figure I. One of the rolls consists of an alternating arrangement of plane and convex surfaces, while the other is formed from an alternating arrangement of plane and concave surfaces. 內(nèi)蒙古工業(yè)大學(xué)本科畢業(yè)設(shè)計(jì)說(shuō)明書 The shape of the rolls on the NCRC result in several unique characteristics. The most important is that, for a given particle size and roll gap, the nip angle generated m the NCRC will not remain constant as the rolls rotate. There will be times when the nip angle is much lower than it would be for the same sized cylindrical rolls and times when it will be much higher. The actual variation in nip angle over a 60 degree roll rotation is illustrated in Figure 2, which also shows the nip angle generated under similar conditions m a cylindrical roll crusher of parable size. These nip angles were calculated for a 25ram diameter circular particle between roll of approximately 200ram diameter set at a I mm minimum gap. This example can be used to illustrate the potential advantage of using noncylindrical rolls. In order for a particle to be gripped, the angle of nip should normally not exceed 25 176。 that the new profiles may lead to reduced roll wear rates. 169。 Faculty of Engineering and P
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