外文翻譯--在非圓柱輥式破碎機(jī)中粉碎(編輯修改稿)
2025-02-03 09:20 本頁面
【文章內(nèi)容簡介】 ill 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。 . Thus, the cylindrical roll crusher would never nip this particle, since the actual nip angle remains constant at approximately 52 176。. The nip angle generated by the NCRC, however, the below 25 176。 once as the rolls rotate by (~0 degrees. This means that the noncylindrical rolls have a possibility of nipping the particle 6 times during one roll revolution. EXPERIMENTAL PROCEDURE The laboratory scale prototype of the NCRC (Figure 3) consists of two roll units, each prising a motor, gearbox and profiled roll. Both units are mounted on linear bearings, which effectively support any vertical ponent of force while enabling horizontal motion. One roll unit is horizontally fixed while the other is restrained via a pression spring, which allows it to resist a varying degree of horizontal load. 內(nèi)蒙古工業(yè)大學(xué)本科畢業(yè)設(shè)計(jì)說明書 The preload on the movable roll can be adjusted up to a maximum of 20kN. The two motors that drive the rolls are electronically synchronised through a variable speed controller, enabling the roll speed to be continuously varied up to 14 rpm (approximately m/s surface speed). The rolls have a centretocentre distance ~,at zero gap setting) of I88mm and a width of 100mm. Both drive shafts are instrumented with strain gauges to enable the roll torque to be measured. Additional sensors are provided to measure the horizontal force on the stationary roll and the gap between the rolls. Clear glass is fitted to the sides of the NCRC to facilitate viewing of the crushing zone during operation and also allows the crushing sequence to be recorded using a highspeed digital camera. Tests were performed on several types of rocks including granite, diorite, mineral ore, mill scats and concrete. The granite and diorite were obtained from separate mercial quarries。 the former had been precrushed and sized, while the latter was asblasted rock. The first of the ore samples was SAG mill feed ob
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