共查询到20条相似文献,搜索用时 161 毫秒
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在低速长网造纸机上,网案摇振装置起着不可低估的作用。网案的摇振可以减少纸幅纤维的纵向排列,促进纤维排列方向与铜网运行方向成一定角度,并有利于减少网案上纤维絮聚的过程,使纸幅的厚度和定量均匀一致,纸幅的横向强度和纵向强度比值提高。因此对摇振装置就有一定的要求。目前网案摇振装置大多采用双偏心式摇振箱,摇振方式也大都采用一个摇振箱同时带动胸辊和网案的方式,这种方式使用非常普遍,然而弊病不少,常使摇振箱损坏。一、采用一个摇振箱的不合理性目前低速长网造纸机在设计中常采用一个摇振箱同时来摇动胸辊和网案,由摇振箱内伸出的连杆 相似文献
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纸机网案摇振装置的改进 总被引:1,自引:0,他引:1
我厂1575短长网双大缸纸机的网案摇振装置采用“Y”形门架与网案联接(如图1所示),Y形门架的一边与胸银轴承臂相连,而另一边与纸机网案案板相连,联接材料为麻花形萍钢板和酚醛树脂板,门架支座为固定支承,案板与胸辊未联接为一体,成形板与胸辊轴承臂用螺栓联接。5-Y形门架;6-麻花形联接板;7-摇振箱。1存在问题该机经我厂10多年的使用发现,网案部分存在以下问题:成形网使用寿命较短,平均为20天左右;摇振装置易损坏,门架联接钢板易断裂,门架支座磨损严重;钢板联接螺栓易松动和断裂;案板支承弹簧钢板易断裂;成形板自重较… 相似文献
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介绍了阿里曼德摇振系统基本组成,理论上分析了摇振的工作原理。重点介绍在生产过程中摇振出现的问题并分析问题产生的原因,并概述解决故障的途径和方法。 相似文献
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一种用于物料分选的大型振动筛在使用过程中.其振动电机安装轴易产生疲劳断裂。文中针对振动电机布置在筛体下的结构型式.从振动电机安装轴的受力分析入手,进行了疲劳强度计算.结果表明不能满足疲劳强度要求。由此.对这种大型振动筛的局部结构作了改进设计。 相似文献
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针对张家港华兴纸业2#瓦楞原纸纸机出现驱网辊电机超负荷跳闸停机现象.对纸机的原料、纸机的阻力和主要驱动辊的功率分配等引起吸停的原因进行分析,通过提高驱网辊电机功率、改变纸机原料和增大第一导辊的包角等有效方案提高车速,解决用户面临的实际问题。 相似文献
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Alec D MacKay Michael W Brown Lance D Currie Michael J Hedley Russell W Tillman Robert E White 《Journal of the science of food and agriculture》1990,50(4):443-457
The effect of four types of shaker, extraction time and temperature on the quantity of phosphate extracted by neutral ammonium citrate was evaluated at two research laboratories. Six unprocessed phosphate rocks, and five partially acidulated and four fully acidulated phosphate fertilisers were investigated. Compared with the more than 10-fold variation in the solubility of the two reactive phosphate rock materials, Sechura and North Carolina, that resulted from using different types of shaker, the solubility of the unreactive phosphate rock materials and the partially and fully acidulated phosphate fertilisers in citrate was influenced to a much smaller degree by the action of the shaker. Sechura was less soluble in citrate that all four unreactive phosphate rock materials when either of the two horizontal shakers were used. This is totally at odds with the documented differences in the chemical reactivity' and agronomic effectiveness of these phosphate rock materials. Not until a wrist-action shaker was used did the solubility of Sechura and North Carolina exceed that of the unreactive materials and approach that obtained with a full end-over-end shake. The neutral ammonium citrate procedure needs to include a more precise definition of the type of shaker and its speed. In laboratories where temperature-controlled extraction is not available, a 24-h shake at 20°C using an orbital or end-over-end apparatus could be an alternative to the standard 1-h extraction at 65°C. 相似文献
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FY10残烟处理机在使用过程中存在处理效果不理想、筛分效率低、回收烟丝结构差、纸中含丝率高等问题,为此对FY10残烟处理机的筛分系统进行了改进并设计增加了一套独立的二次剥离系统。主要是:①残烟处理机出料振动筛分机由双层改为单层;②丝网更换为不易变形的板网;③在两台振动筛分机的板网下方增加弹力球;④二次剥离系统由提升喂料机、柔性剥离装置、圆型多层筛分机等组成。改造后FY10残烟处理机解决了烟末堵塞网孔且清理难的问题,回收烟丝整丝率平均值由56.93%提高到67.86%,碎丝率平均值由1.35%降低至0.34%,纸中含丝率平均值由27.45%降低至3.19%,提高了烟叶原料的利用率,降低了生产成本。 相似文献
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从螺旋输送挤出、叶片泵、辊压成形等三个方面分析了饺子成形机的功率 ,初步确立了成形设备的功率消耗的计算公式 ,为今后成形机的设计提供了理论依据 相似文献
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Ricardo Cardoso de Oliveira Sueli Teresa Davantel de BarrosMarcelino Luiz Gimenes 《Journal of food engineering》2013
In the present paper, the extraction of passion fruit oil with acetone, ethanol and isopropanol of passion fruit seeds under three different techniques (ultrasound, shaker and soxhlet) were studied. The influence of seed to solvent ratio, time and type of solvent were investigated during ultrasound, shaker and soxhlet process. Hexane was used as well, as an extraction solvent to evaluate the extraction of oil in all extraction process studied to make a comparison among the employed solvents. The temperature was kept isoterminally at 40 °C in both shaker and ultrasound process. The highest yield when green solvents were was 23.8%, during ultrasound process, with acetone was used. Our results indicate that ultrasound can greatly replace the conventional extraction. 相似文献