银杏侧枝振动落果的试验研究

为设计一种合理的振动采集干果的机具，对银杏树果实的果柄结合力进行了测试，对果枝进行了激振试验和振动落果试验，还在室外对立木侧枝进行了振动测试，经过数据处理和分析，得出了银杏侧枝振动落果最佳的激振频率、振动加速度和振动时间，为果树侧枝振动采种机具的设计提供了科学的技术参数和设计依据     

带锯机张紧系统锯条横向振动特性的研究

本文对带锯机杠杆压砣式张紧系统压砣及锯条横向振动进行了测试，并运用DASP6．53振动分析软件对测试结果进行了分析，得到了带锯机杠杆压砣式张紧系统振动的特性、产生振动的频率范围及频率特性，为今后带锯机的动态设计奠定了基础。     

镇江韦岗铁矿爆破地震观测研究

通过对镇江韦岗铁矿爆破振动速度观测，探索了质点峰值振速衰减规律，研究了振动频率、纵波速度和振动持续时间，并作了频谱分析．     

木工平刨床振动故障诊断

通过对振动过大的ＭＢ５０Ａ木工平蚀档的振动测量和频谱分析认为，引起该机床振动故障的原因主要是刀轴支承损坏和刀轴平衡，尤其是对于高速旋转的刀轴，即使不平衡量较小，也会对平刨床的振动产生较大的影响，这为木工平刨床的振动故障诊断、维修和使用提供了参考。     

割灌机把手振动分析

对割灌机把手振动进行测试分析，找出引起振动的主要原因，为进一步减轻把手振动提供设计依据。     

强夯振动波形特征及衰减规律探究

指出了强夯法被广泛应用于多种地基处理，其施工过程对周边环境产生影响，因此有必要对其振动规律探究。对某高速公路工程高填路基强夯处理作业振动试验监测数据进行了分析，结果发现：强夯施工虽然以垂直方式进行冲击，但检测到的地面振动速度表现为以水平方向振动速度为主，具有脉冲型峰值、且衰减的速度较快；振动峰值的频率以中高频为主且随震中距的加大而变小；强夯单次振动持续时间较短；利用origin软件对监测数据进行非线性拟合，得出速度随震中距衰减的公式：v＝8486．90× R－2．50，发现强夯振动产生的速度的峰值随震中距的增加增加到60m前衰减很快，之后衰减速度缓慢；据此公式可对强夯振动的安全距离进行预测。     

木工机床振动质量的评价

通过对木工机床振动测试仪器、测试方案的选择，并结合木工机床测试结果的分析，介绍了木工机床振动质量评估的基本方法和途径。     

落叶松锯材外观分等与振动检测试验的研究

根据中国、日本和美国的外观分等标准对落叶松试材进行了以强度为基础的外观分等，并对试材进行了振动检测，分析比较了三国不同外观分等结果与振动检测的相关关系。     

振动流化床振动特性研究

建立了振动流化床的简化模型和数学模型，进行了分析计算，并在两种振动形式的两种振动泫化床机型上做测试，其结果和计算结果基本吻合。     

四面刨床进料梁振动特性及振动量分析

对Profimat23EC四面刨床进料梁振动特性和各进给辊轴振动量随进给速度及加工厚度的变化进行了分析，并对进料梁的设计及机床操作提出建议。     

杠杆压铊张紧系统带锯空转振动特性的分析

本文对杠杆压铊张紧系统带锯产生振动的原因,进行了试验和理论研究。用2034型频谱分析仪试验表明,带锯条振动属于复杂周期信号的离散型频谱,是由多个简谐振动叠加而成;同时理论考察分析表明,带锯条杠杆压铊张紧系统不同于秤量重物的“平衡秤”,不可能达到“静平衡”,而是在锯轮参数激振作用下形成周期性受迫振动。锯轮参数激振和杠杆压铊张紧系统位移激振之间交互作用,是使带锯条产生周期振动并引起张紧力发生变化的重要原因。     

行星式球磨机的工况监视系统设计

通过研究行星式球磨机结构特点和运行特点,结合工业常用的温度和振动测量方法,设计了一套监测温度和振动信号的方案。     

炭用机械振动磨的研制

FL—100炭用振动磨选定低振强(5g)、三筒可移动式。生产能力50—100kg/h,粉磨细度180—200目。投资少、省电、基本不污染环境,符合连续粉磨炭工艺要求,是目前适用于炭类工业的高效粉磨设备。     

木屑机械化学解聚工业装置的主要技术进展

木屑机械化学解聚法制取繁殖酵母所用糖液的工业装置曾于1977年7月开始全流程连续运转一段时期,用所得木材水解糖液,生产出成百吨医药干酵母粉,质量符合中华人民共和国药典要求。主水解设备1000升振动磨先后经过三次设计和试制,在各方面取得了关键性改进,承受了振动强度10g的长期考验。此外,在干燥、转化、中和、氧化、木素过滤等工序上也取得了一些重要的技术进展。     

Preparation of acetylated wood meal and polypropylene composites II: mechanical properties and dimensional stability of the composites

Acetylated wood meals of Sugi (Cryptomeria japonica D.Don) wood were prepared by mechanochemical processing using a high-speed vibration rod mill. Weight percent gain (WPG) of the acetylated wood meals ranged from 7.0 to 35.5 %. Wood–plastic composites (WPCs) containing 50 % acetylated woods were produced by an injection molding technique. The polymer matrix used was polypropylene homopolymer. Maleic anhydride-grafted polypropylene (MAPP) was also used as a compatibilizing agent. The mechanical properties of WPCs in bending and tensile tests were independent of WPG of acetylated wood meals, and the test values for WPCs containing acetylated wood meals were lower than that of unmodified wood meal. The use of MAPP increased bending and tensile strength, but no effect on bending modulus was found. An increase in WPG significantly decreased water absorbability and thickness swelling of WPCs as measured by dimensional stability tests. These results demonstrated that mechanochemical processing is a promising technique for preparing WPC material with improved dimensional stability. The future challenge is to inhibit the decreases in mechanical properties of WPCs containing acetylated wood meals.     

HPLC evaluation of resin acid degradation with ozone treatment of pulp mill effluent

Summary Pulp mill effluent in the pH range of 7 to 8.5 was found most suitable for ozone treatment. Both resin acids and phenolic compounds were degraded in similar efficiency. Among the various resin acids, dehydroabietic acid (DHA) was found to be the most resistant to ozone degradation. The determination of DHA in the treated effluent can therefore reflect the degree of completeness of the effluent treatment. A simple and fast HPLC method reported previously for the determination of DHA was found to serve well for this purpose. Results are demonstrated by treatments of various pulp mill effluents. Received 11 March 1997     

碱法制浆黑液制活性炭的试验研究

讨论了硫酸盐法纸厂废液通过炭化回收碱的同时,综合利用炭素生产高吸附活性炭。试制出的粉状活性炭亚甲兰脱色力平均为23ml,碘吸附大于1000mg·g-1,碱回收效率达86%。可望解决硫酸盐法纸厂的废水污染,取得社会效益的同时,亦有一定的经济效益。     

Preparation of acetylated wood meal and polypropylene composites I: acetylation of wood meal by mechanochemical processing and its characteristics

Wood meals of Sugi (Cryptomeria japonica D.Don) passing 2.0 mm and retained on 1.0 mm mesh screens were milled along with acetic anhydride (AA) and pyridine as a catalyst in a high-speed vibration rod mill at ambient temperature. The weight percent gain (WPG) of the chemically modified wood was calculated based on the yield after washing with deionized water. The effects of amounts of AA and catalyst added, pulverization time, and saponification of the acetylated wood on WPG were examined. In addition, FT-IR analysis, and water vapor adsorption and desorption tests were performed as functions of the WPG. Increases in WPG, the acetyl contents of the acetylated wood after saponification, changes in the FT-IR spectra after pulverization, and the water vapor sorption isotherms showed that the one-step acetylation systematically modified the hydroxyl groups of the wood into acetyl groups. Up to 38 % WPG was obtained at 100 phr AA and 15 phr catalyst, and 120 min pulverization. Pulverization time and the amounts of AA and catalyst added to the wood meals could be adjusted to obtain acetylated wood meal with the desired WPG. These demonstrated that the mechanochemical acetylation is a method to prepare acetylated wood meals with high WPG at less reaction time and required AA addition.     

刨花板全自动生产线横锯推板采用变频交流拖动系统的改进

本厂刨花板生产线横锯推板动力系统,系引进德国设备,备品备件价格昂贵。本文介绍了此推板系统由变极调速改造为变频调速的基本原理技术要点。