炭阳极生产用振动成型机

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。     

振动频率和振动时间对粉料填充密度的影响

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。     

振动参数对HDPE注塑件力学性能的影响

采用自制的振动注射试验装置注射成型高密度聚乙烯(HDPE)制件,探讨振动频率、振动压力幅度对HDPE注塑件屈服强度、断裂伸长率、拉伸弹性模量和冲击强度的影响。结果表明,振动使得注塑件的综合力学性能得到改善;不同温度下振动频率或振动压力幅度对注塑件力学性能的影响程度不同,但其影响趋势是一致的。     

振动力场下背压对喷嘴内熔体压力的影响

用聚丙烯做原料,通过对空注射实验,测定了在一定振动条件和背压下喷嘴中的熔体压力。结果表明:振动有助于提高喷嘴中熔体的压力,最大提高约50%;与稳态注射相比,振动能减弱塑化过程中熔体的黏度突变带来的影响;在振动频率为10Hz,振幅为0.08mm时,喷嘴内熔体压力达到最大。     

保压时间和保压压力对注塑制品厚度分布的影响

通过实验研究了保压压力和保压时间对制品厚度分布的影响,所得的结论可以指导塑件和模具的设计。     

高气油比油井套压控制对油井产量影响分析

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。     

测试分析爆破振动对建筑物的影响

随着爆破技术的广泛应用,人们也开始关注爆破的安全问题,特别是对周围环境和建筑物的影响,爆破振动的预防与控制在爆破施工与设计中占有至关重要的地位。本文通过介绍爆破振动效应测试方法,分析了爆破振动对建筑物的影响特征。     

低频振动场对HDPE力学性能影响的研究

采用自行研制的压力振动注射装置对HDPE进行了力学性能的研究。分别研究了加工温度、振动频率、振动压力和振动时间对HDPE拉伸强度的影响。结果表明，在0－0.47Hz范围内，随着频率的增加，拉伸强度提高，超出此频率范围拉伸强度有所下降，且加工温度越低，振动效果越明显。HDPE 5000S和HDPE DGDA6098的拉伸强度分别最大提高20.7%和41.3%。     

天然气管道经济压比的选择分析

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。     

减水剂对C80PHC混凝土拉/压比的影响研究

以管桩生产配合比为基本参照,分别研究了萘系、聚羧酸、氨基磺酸盐和磺化丙酮等4种减水剂对C80PHC混凝土抗压强度、劈裂抗拉强度,拉/压比以及密实性的影响.研究结果表明:不同品种减水剂对混凝土力学强度以及密实性影响不同,其中,掺磺化丙酮混凝土脱模强度较高而聚羧酸较低,掺聚羧酸混凝土拉/压比较大而磺化丙酮较小,掺聚羧酸混凝...     

低频振动场对HDPE性能的影响

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%。     

振动成型生产特大规格铝用阴极炭块

利用国产振动成型机,通过改进和调整生产工艺配方、生产工艺技术参数等方法,成功地开发出了达到国家标准,满足用户需要的特大规格铝用阴极炭块。     

Effect of low‐frequency melt vibration on HDPE morphology

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     

Bending vibration characteristics of the piezoelectric composite double laminated vibrator

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.     

低频振动对聚乙烯注射件力学性能的影响

利用压力振动注射实验装置，实现低频率的压力振动注射，探讨了振动频率、振动压力对哑铃注射试样屈服强度的影响，发现LDPE NA541注塑件的屈服强度最大增幅为14．5％，HDPE 5000s和HDPE DGDA6098注塑件的屈服强度最大增幅分别为21．8％和21．9％。     

塑料注塑机五点斜排双曲肘合模系统特性研究

推导出高速精密塑料成型机双曲肘合模机构弹性动力学模型,利用实振型叠加法进行弹性动力分析(KED)/准静态分析(KES);实测肘杆振动加速度信号,通过最小二乘法(LMS)消除趋势项、平滑处理和二次频域积分得到振动位移值,并与理论模型值作对比研究,证明了所建模型的合理性,为肘杆机构的优化设计提供了依据。     

时间／压力试验装置的研究

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。     

The morphology and property of HDPE in the presence of oscillation pressure and poly(ethylene terephthalate)

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