共查询到19条相似文献,搜索用时 689 毫秒
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针对我国纤维板生产中纤维分离存在产量较低和纤维质量相对不高的问题,通过对热磨机动磨盘的支撑主轴结构特点和分离加工工艺的分析,对热磨机的主轴进行了力学分析和径向静压轴承实验台的设计.经过该实验台检测的径向静压轴承,可大幅减少热磨机的停车检修时间,提高纤维分离的生产效率;减少主轴径向振动;提高热磨精度进而提高纤维质量. 相似文献
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减小生物质原料粒径是提高生物质精练过程中组分分离效率的关键步骤,生物质粒径的大小以及不同机械处理方式对原料反应性能的影响尚不明确。本研究对比了机械粉碎与双螺杆挤压机联合盘磨处理获得物料的反应性能,结果表明:机械粉碎物料受到剪切力作用,长度变短导致粒径变小,纤维仍然呈紧密的束状结构;随着粒径减小,比表面积与吸液能力随之增加,反应性能越好,粒径小于0.18 mm的物料反应性能最优。双螺杆挤压机联合盘磨机利用剪切力、摩擦力、挤压力使物料纤维微纤丝化,打开了部分闭合纹孔。与粒径小于0.18 mm的粉碎机粉碎物料相比,双螺杆挤压联合盘磨获得的物料比表面积提高了31.54%,吸液能力提高了43.46%;过氧化氢预处理时,木质素去除率提高31.93%,预处理后酶解葡萄糖得率提高54.19%。实验表明,双螺杆挤压机联合盘磨处理比机械粉碎更利于提高生物质反应性能。 相似文献
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BM6A热磨机的振动与轴封骆金平(西北人造板机器厂乾县713350)VibrationandMainShaftSealingofRefinerBM6ALuoJinping(NorthwestWood-basedPanelMachineryFactor... 相似文献
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林木生物质高效精细粉碎研究现状及展望 总被引:1,自引:0,他引:1
生物质能的开发利用及产业化是当前研究的热点,粉碎加工是生物质能转化利用的重要预处理工序.粉碎粒度影响后期加工利用效果,粉碎效率和功耗是影响大规模开发利用生物质能源的关键因素.本文论述了林木生物质高效超细粉碎研究的意义,概述了国内外相关研究现状,并展望了生物质粉碎设备的发展趋势. 相似文献
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Jinwu Wang Johnway Gao Kristin L. Brandt Michael P. Wolcott 《Journal of Wood Science》2018,64(4):338-346
Fine wood powders have advantages over traditional coarse wood particles for various emerging applications. However, an efficient system to produce fine wood powders has not been well established. We investigated the comminution capability and efficiency of a two-stage grinding system consisting of a hammer mill circuit and an rotor impact mill circuit to convert wood feedstocks into fine powders. Air-dried forest harvest residuals were comminuted by the hammer mill circuit to three intermediate product sizes with geometric mean particle sizes of 1618, 669, and 316 µm. These intermediate products were then pulverized into fine wood powders with median particle sizes ranging from 35 to 250 µm. The specific energy consumption increased with the decrease of median particle sizes, with a transition at around 100 µm after which the energy consumption increased exponentially. This large-scale grinding trial provides the reliable energy consumption data for design and process economic analysis of mechanical biomass preprocessing. 相似文献
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杨仕若 《中南林业科技大学学报(自然科学版)》2006,26(3):94-97
将列车-拱桁组合体系桥视为一整体振动系统,由势能驻值原理及形成结构矩阵的对号入座法则,导出此系统横向振动的矩阵方程,以车辆构架在桥上的实测蛇形波和车辆轮对在线路上的实测蛇形波为激振源.计算了41号桥的横向全振幅,计算值与实测值接近.通过九江长江大桥舒适度指标的计算,表明该大桥具有良好的横向刚度. 相似文献
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介绍了一种超细木粉加工设备的总体布置及工作原理,阐述了该设备筛箱的出料机构设计。应用粉碎力学原理估算木粉粒径,根据粒径要求进行参数选择与动力学设计,并用试验结果验证理论分析的正确性。 相似文献
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本文通过大量的抓取木材试验,经过理论分析,探索振动抓取阻力及其振动参数对抓取阻力、抓取性能的影响,选出最佳振动参数,这对于设计振动木材抓具具有重要的现实意义。 相似文献
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After enzymic hydrolysis of polysaccharides in milled wood or pulp the unhydrolysed lignin residue becomes soluble in certain polar solvents. Extensive disintegration of the wood is necessary to obtain a sufficient accessibility toward the enzyme. For milling a porcelain rotary ball mill is recommended. A relationship has been found between the milling energy, which is proportional to the size of the mill, the milling time, and the yield of ball-milled wood lignin (BMWL). Enzymatically isolated lignin (EIL) requires a critical milling time which is shorter than that for obtaining maximum yields of BMWL. A procedure for isolation of the total lignin content from wood and pulps in the form of three fractions has been developed, giving a water soluble, low molecular carbohydrate-lignin complex by water extraction of ball-milled wood, a BMWL-carbohydrate complex by subsequent extraction with dioxane, and a EIL-carbohydrate complex by dioxane extraction of the residue after enzymic hydrolysis. 相似文献
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热磨机磨片的齿形结构是磨片和原料间传递能量的主要方式,它与木片原料被研磨时的运动状态和研磨时间,以及纤维制备过程中纤维质量和设备的能耗密切相关。笔者根据磨片破碎区、粗磨区、精磨区的齿形结构、磨齿倾角、周向齿等参数对纤维分离能耗的影响以及磨片的设计要求,设计了一种有利于降低纤维分离能耗的热磨机磨片,并运用ABAQUS软件对磨片进行了静力学分析,分析结果表明磨片受到的静力作用对自身影响很小,设计满足要求。 相似文献