共查询到18条相似文献，搜索用时 343 毫秒
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热磨机磨片的磨损,材质及经济分析 总被引：8，自引：0，他引：8
本文分析了磨片的磨损机理及对磨片材质的要求，对高铬铁和冷硬铸铁磨片与不锈钢磨片的技术经济指标进行了对比分析。结果表明，不锈钢磨片的技术特性和经济效益最好。 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
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阐述了热磨机磨片的主要功能,并对影响磨片齿形结构设计的三个主要因素进行了分析.研究表明,原料的纤维特性、热磨机的性能、磨片的制造工艺对磨片齿形的结构设计、纤维分离的机理及磨片综合性能等有不同程度的影响. 相似文献
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热磨机是生产中密度纤维板的主要设备,随着人造板在日常生活中的需求不断扩大,人们对它的质量要求也越来越高。磨片是热磨机的配套产品,磨片相当于机床上的刀具,在热磨机上起着不可轻视的作用, 它的应用适当与否直接影响人造板的质量。从几家人造板生产厂对磨片反馈的情况看,普遍认为有以下几种情况:磨机功耗大;纤维状态(纤维板组成单元)不稳定;磨片损坏快等。针对这些问题,我们前往生产厂家实地考察,并认真讨论,查阅资料,深入分析,还咨询了有关国外磨机专家,一致认为出现上述问题的原因是由于动、静磨片盘间隙调整不当所致。笔者从以下几个方面加以分析说明: 相似文献
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《林业工程学报》2021,6(5)
近些年来,为了提高纤维分离质量和降低能耗,磨片结构研究成为热点关注领域之一。国内外许多学者就磨片结构对纤维解离质量及能耗影响,展开了数学理论分析及实验研究。但基于传热学理论对上述关系的研究较少,因此本研究以传热学理论为基础展开研究。由于磨片处于高温高压的复杂工作环境中,不便于以实验的形式探究磨片的工作状态,故以传热学理论为依据,对现有磨片的工作状态进行理论和建模分析,根据分析结果,综合考虑原料特点后,提出磨片结构的改进方案:改变破碎区磨齿齿形;减小粗磨区和精磨区磨齿齿倾角;减少粗磨区磨齿数量,降低周向齿齿高;在破碎区和粗磨区间,粗磨区和精磨区间分别设置缓冲区域。将现有和改进型磨片建模分析结果进行对比,结果表明:磨片结构对纤维解离质量及能耗有较大的影响,改进型磨片不同区域温度场及热通量分布差异及平均值减小,受到的热应力较小,研磨工况较稳定;摩擦作用减弱,磨片热稳定性提高,纤维解离质量提高,因摩擦产生的能耗降低22.7%,验证了改进设计的合理性。 相似文献
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纤维板生产原料的纤维特性、热磨机的性能、磨片的制造工艺对磨片齿形的结构设计、纤维分离的机理及磨片综合性能等有不同程度的影响。 相似文献
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基于摩擦学理论和传热学,利用ANSYS建立圆环分区直齿热磨机磨片的稳态温度场和热变形的三维热分析有限元模型,分析该磨片处于热平衡状态下的温升和热变形.结果表明,热变形对磨片之间间隙有一定影响. 相似文献
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热磨机磨盘真实间隙非接触测量的研究 总被引：1，自引：0，他引：1
王宝金 《林业机械与木工设备》2004,32(6):12-15
目前普遍采用接触式测量方法不能实时反映磨片磨损后的真实间隙。本文对采用电涡流传感器和超声波测厚仪组合实时非接触测量磨盘真实间隙的设计方案进行了研究和探讨。 相似文献
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Defibrator is a very important machine in the wood industry for producing fiberboard.The refiner plates are the key parts of defibrator that directly act with the wood,and broken easily.The working life of the refiner plates is of significance to the wood industry.It may affect refining quality,production efficiency,and power consumption.In this paper,the abrasion resistance of the refiner plate made of different materials,the stainless steels and high chromium cast irons,were tested and compared.The results showed that abrasion resistance of refiner plate made of high chromium cast irons was better than that of the stainless steel materials.Although the two kinds of materials have the same compositions,their abrasion resistances have apparent difference.The main reason is that the material microstructures have very important effects on their performance.The refiner plates made of developed high chromium cast irons don‘t demand the complex heat treatment.This can simplify the producing process,save the cost of production,decrease labor strength,and increase the production efficiency. 相似文献
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XIANG Hong-liang 《林业研究》2005,16(4):296-298
本文研究了如何运用计算机技术三维制模、采用覆膜砂造型、优化合金材料和利用计算机来控制打箱时间等新工艺来生产磨盘。结果证明:利用计算机技术能减少制模时间,提高产品的适应度;同时精密成形能减少磨盘的废品率;优化合金材料和控制好打箱时间来消除淬火热处理阶段。与传统的工艺相比采用这些改进措施,磨盘的制造工艺有增强韧性、提高铸件精度、消除热处理阶段和提高生产效益等几方面的优点。图5表4参6。 相似文献
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结合实验热磨机的功能与设计要求,对开放式实验热磨机的各组成部分及主要结构进行了功能分析与设计.开放式实验热磨机的主要特点是既可满足研究纤维分离机理所需,又可满足研究纤维分离设备结构优化的要求.该机的设计与研制为国内研究纤维分离机理及纤维分离设备性能提供了一个实验平台,对提高国内该领域的研究水平与促进技术进步具有积极作用和现实意义. 相似文献
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为了实现对生产现场热磨制浆系统的有效检测，提前预防设备故障的发生，开发了热磨制浆系统远程在线监测及故障诊断专家系统。该系统将计算机技术、传感器技术、通信技术、数据库技术与设备诊断技术相结合，以可编程序控制器（PLC）和InTouch10．1组态软件为开发平台，对热磨制浆系统现场的各项参数进行采集、分析和实时反馈。运用关系型数据库系统SQLServer和CLIPS专家系统工具建立相应的故障诊断规则，实现热磨制浆系统远程监测及故障诊断专家系统的设计，提高了热磨制浆系统运行的安全系数和对故障的分析能力，可满足用户对在线检测及故障诊断的需求。 相似文献
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Graham A. Ormondroyd S. K. Källbom S. F. Curling B. K. Stefanowski B. K. Segerholm M. E. P. Wålinder 《Wood material science & engineering》2017,12(4):203-210
During fibre processing, wood fibres are subjected to a range of physical and chemical conditions sufficient to slightly alter their chemical composition and hence their ultimate performance when used in the manufacture of wood fibre-based composites. In order to better understand the effects of refiner conditions on material performance, wood fibres were subjected to processing at different refiner pressures (4, 6, 8 and 10 bar) and subsequently dried in a flash drier. The fibres were analysed for changes in surface area, surface energy, surface structure and water vapour sorption characteristics. The methods applied were nitrogen adsorption utilising the Brunauer–Emmett–Teller theory, inverse gas chromatography, scanning electron microscopy and dynamic vapour sorption. It was found that increasing refiner pressure resulted in fibres of lower surface area, accompanied by increasing dispersive surface energies up to operating refiner pressures of 8 bar. It was found with fibres refined at different pressures that as the refiner pressure increased the equilibrium moisture content of the fibre decreased at the set relative humidities. However, it was also noted that the hysteresis was not significantly different between each of the refiner pressures. The results suggest that different refiner pressures can be used to tune the surface characteristics which may be beneficial to product development and the improvement of the environmental profile of the wood fibre composites. 相似文献
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Jonas Hafrén Dinesh Fernando Dmitri Gorski Geoffrey Daniel Florian A. Salomons 《Wood Science and Technology》2014,48(4):737-753
High-yield pulping of wood chips using low-consistency (LC) refining in combination with primary-stage high-consistency (HC) refining has previously been shown to produce paper with quality parameters (tensile strength and light-scattering coefficient) commonly targeted for newsprint with significantly less refining energy input than using only HC refining. However, questions remain on the differences in the refining action between the two refiner types and for high-yield pulping, the refiner energy demand is a crucial process parameter. Therefore, fines- and fiber-fraction development in HC and LC refining has been studied in detail using Bauer-McNett fractionation, and the respective tensile strengths of the different fractions have been compared. Quantitative and qualitative (morphological) characteristics of the isolated fine fractions have also been analyzed in detail using a newly developed automated fluorescence microscopy method and scanning electron microscopy. The results suggest the difference in LC/HC pulp properties (strength and optical) is partly derived from deviating fiber and fines morphologies and mass balances. The quality of the fines generated during HC and LC refining also differs. LC-refined pulps contain thinner fibrillar fines (thread-like) and HC-refined pulps broader fibrils such as lamellae-type fines. Flake-like fines from the outer fiber wall decreased in relative amount with energy input. 相似文献
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在不同的热磨条件下(蒸汽压力为0.4、0.6、0.8、1.0MPa,磨盘转数为2 500r/min和3 000r/min),将麦秸原料分离成纤维,并试制了相应的麦秸中密度纤维板,对比分析了不同的热磨条件对麦秸中密度纤维板的内结合强度、弯曲性能、吸水性能、表面硬度和边部握螺钉力的影响。结果表明,不同的热磨条件下分离得到的麦秸纤维形态存在差异,纤维的强度和形态对麦秸中密度纤维板的物理力学性能影响较大。当蒸汽压力为0.8MPa,磨盘转数为3 000r/min,麦秸中密度纤维板的各项性能得刮改善。 相似文献