共查询到18条相似文献,搜索用时 125 毫秒
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介绍了山东晨阳炭素股份有限公司自行研制和开发的振动成型机在炭阳极生产中的应用,分析了振动成型机的结构和工作原理,确定了振动成型技术参数,讨论了振动成型机性能对炭阳极块质量的影响,提出了对炭阳极生产用振动成型机进行改进所采取的相应措施。 相似文献
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将Si粉(粒度≤0.044mm)和聚乙烯醇水溶液(聚乙烯醇质量分数为5%)按一定比例混匀,过筛造粒后,振动装料,研究了振动频率(14~50Hz)和振动时间(10~230s)对粉料填充密度的影响。研究表明:振动频率对粉料的填充密度有着显著的影响,当振动频率≤29Hz时,粉料不产生“沸腾”和颗粒分层现象,且振动一定时间后,粉料填充密度会趋于恒定,并且随振动频率的增加,振实速度加快;当振动频率在29~50Hz时,粉料产生“沸腾”和颗粒分层现象,导致粉料填充不均匀,并且随频率的增大,“沸腾”和颗粒分层现象加剧。 相似文献
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在高气油比油井中,套压的大小对油井采油速度、生产压差、泵效等各个方面具有显著的影响。本文就套压的大小对泵效的影响从气锁形成到井筒压力变化进行了论述,同时介绍了部分常见的防气措施及原理。 相似文献
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最优站压比影响最优压气站间距,进而影响压气站的个数。在管道设计压力、管径确定后,需要对管道全线进行布站方案比选。针对目前国内天然气管道建设实际情况,对大管径输气管道压气站最优压比的选择进行探究。阐述了研究的主要思路及方法,以D1219、15MPa管道和D1422、12 MPa管道两个系统方案为例,确定了不同压比下的布站方案,分析了压比与设计参数的关系。通过不同压比、不同气价与管道经济性的关系,分析了经济压比的趋势走向及影响因素。得出D1219、15 MPa管线和D1422、12MPa管线的经济压比范围。对压气站场布置及站优化设计提出建议。在工程前期设计阶段要结合管道建设及运营等实际情况,充分结合内因和外因的影响,确定比选方案,深入开展经济技术比选。 相似文献
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利用低频熔体振动注射成型技术获得自增强高密度聚乙烯。实验结果表明,采用振动注射成型工艺,试样屈服拉伸强度由26.5MPa提高到36.1MPa;试样的芯层中可获取沿流动方向生成的串晶或行式排列的片晶结构;压力振动注射有利于分子在(110)晶面择优取向,使结晶更加完善;振动注射提高了试样的结晶度,芯层结晶度最大提高了10.2%。 相似文献
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BACKGROUND: A low‐frequency vibration‐assisted injection‐molding (VAIM) device was developed to explore the morphology of high‐density polyethylene (HDPE) injection moldings. Scanning electron microscopy, wide‐angle X‐ray diffraction and differential scanning calorimetry were used to characterize structure‐property relationships of final products prepared under different VAIM processing conditions (vibration frequency and vibration pressure amplitude) with conventional injection molding for comparison. RESULTS: It was found that increasing the vibration frequency at constant vibration pressure amplitude was beneficial for obtaining ‘shish‐kebab’ structures in the core region of VAIM specimens, and increasing the vibration pressure amplitude at constant vibration frequency was a prerequisite for achieving HDPE specimens with large‐scale lamellas, more pronounced orientation and high crystallinity. CONCLUSION: Both preferred orientation lamellas and increased crystallinity allow one to obtain strong injection moldings with the application of the melt vibration technique. Copyright © 2009 Society of Chemical Industry 相似文献
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《Ceramics International》2021,47(22):31259-31267
In this study, the bending vibration characteristics of the piezoelectric composite double laminated vibrator are studied by simulation and experiment. Firstly, the bending vibration characteristics of a 2-2 piezoelectric composite double laminated vibrator under free and fixed boundary conditions are simulated by the finite element analysis software. Results show that the vibrator has a pure bending vibration mode in the frequency band of 2–4.6 kHz. Then, two types of a 2-2 piezoelectric composite double laminated vibrator are prepared by using epoxy resin and silicone rubber. The test results show that the resonance frequencies of the free and fixed boundaries are ~4.5 and 2.5 kHz, respectively. The vibrator has relatively pure bending vibration characteristics, especially the silicone rubber vibrator, which has lower resonance frequency, higher electromechanical coupling coefficient and larger bending vibration displacement; thus, the 2-2 piezoelectric composite double laminated vibrator is a better choice for the fabrication of a low-frequency transducer. 相似文献
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介绍了时间/压力试验装置的构造和工作原理。对该装置的试验过程和试验结果进行了分析,并对容器内装入的样品量、样品压实程度和点火功率等因素对试验结果的影响情况进行了讨论。 相似文献
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The injection‐molded specimens of neat HDPE and the PET/HDPE blends were prepared by conventional injection molding (CIM) and by pressure vibration injection molding (PVIM), respectively. The effect of oscillation pressure and PET phase with different shapes on superstructure and its crystal orientation distribution of injection molded samples were characterized by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and two‐dimension wide‐angle X‐ray diffraction techniques (2D‐WAXD). Hermans' orientation functions were determined from the wide‐angle X‐ray diffraction patterns. With the PET particles added, the shear viscosity of blend increase and crystallization rate of HDPE phase is enhanced. For the neat HDPE samples, with the promotion from oscillation shear, the orientation parameter experienced a large increase, moreover, the PVIM can induce transverse lamellae (kebabs) twisting in growth direction. Because of the redefined flow field and nucleation effect of PET particles, the crystal orientation of blend is also increased. So the tensile strength of vibration samples enhanced and elongation at break declined. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献