专利文摘

注塑机预塑、注射液压回路本实用新型涉及一种可以同时控制注塑机预塑与注射的液压回路。注塑机预塑、注射液压回路包括由伺服马达驱动的双向油泵、电磁换向阀、预塑油马达、单向阀、注射注缸、溢流阀。伺服马达驱动双向油泵,双向油泵一端连接电磁换向阀后,一路连接预塑油马达,     

博创推出配用伺服油泵的伺服节能系列注塑机

伺服节能系统是指由专用伺服驱动器驱动伺服电机，能实现流量、压力的闭环控制和输出的电液伺服动力源，配备有含旋转变压器的伺服电机、含压力传感器的和液压回路的油泵，专用的伺服驱动器及周边元件等组成。博创公司经过约两年的研发，成功推出了配用伺服油泵的BS3伺服节能系列注塑机。     

伺服驱动器外围电路选型技术分析

伺服驱动器外围电路主要包括主回路和控制电路电缆、低压断路器、伺服变压器、交流接触器、噪声滤波器、电抗器、制动电阻。分别介绍了它们的选型原则和方法。基于以上方法设计出的产品取得了较好的使用效果。     

住重塑胶机械（香港）有限公司

住重塑胶机械（香港）有限公司营业部经理杜俊德表示，住友独家开发制造的高精密度伺服马达，与技术表率的全闭回路控调组合，即是SE-S系列，展现出高性能的表现，住友的电动注塑机的特点就是伺服电机直接驱动整台注塑机，没有任何误差，比普通用皮带带动的注塑机还好。住友自行开发伺服马达，不经皮带传支，把滚珠丝杆直接伺服马达的轴芯，即是把伺服马达造成锁模机构和注射机构的结构的一部分，因而可作出直接的驱动。     

软件功能代替电动执行机构的伺服放大器

1引言水泥生产自动控制系统中，电动执行机构是实现工艺操作调节控制的重要执行单元，对水泥生产线控制回路的实现及生产线运行效果的好坏影响很大。笔者在某2000t／d生产线调试期间，因该线所配国产DKJ电动执行机构的伺服放大器故障多、调节稳定性差、易产生振荡，输出效果不理想。为此曾会同有关人员用DCS控制系统中的软件功能来完成电动执行机构的伺服放大功能，取得了较好效果。在此作一介绍，供参考。2电动执行机构工作原理及伺服放大器存在的问题2．1电动执行机构工作原理DKJ电动执行机构由伺服放大器DFC和执行器DZA两部分组成…     

富强鑫AF系列油电复合射出机

富强鑫的AF系列油电复合式射出机，一方面具有全电式定位精准省能源的特性；一方面保有油压结构高推力的特性。AF-200采用最新的AC伺服马达驱动技术及全闭回路控制，将传统油压注塑机最耗能的加料部分改为先进的ESD（E1ectric Screw Drive）电动螺杆驱动结构，并结合德国MOOG航天级高速伺服阀及蓄压器，最大射速可达700mm／s.     

CS系列两回路调节器组态技术

ＣＳ系列两回路可编程调节器是国内研制生产的较为成熟的可编程调节器。本文首先将其用户程序编程方式与ＹＳ－８０作一比较，然后总结了其中基本控制模块在不同应用中的组态方法及注意事项，最后介绍了该系列特有的伺服驱动模块。     

注塑机伺服泵多回路控制技术的研究

研究了德国博世力士乐公司的伺服泵多回路控制技术,从电气控制和液压传动两方面深入研究,并将此技术应用到注塑机上,通过实验测试相关性能,并提出改进方案,从电气控制和液压传动两方面分析改进后的控制原理,并在原机器上进行改造,进而测试相关性能。通过比较改进前后的数据表明,新方案性能更稳定、运行更可靠、应用更方便。     

注塑包装设备功能化专用化高速化节能化科学发展的分析研究

注塑包装设备的品种朝着功能化专用化方向发展,成型能力朝着高速化方向发展,控制系统朝着智能化方向发展,加工性能朝着节能化环保化方向发展。高速成型是注塑包装设备的首位加工性能,也是决定是否具有市场发展前途的标志。根据塑料包装容器的应用领域和功能特点,运用现代先进技术开发塑料包装设备,满足内需,推动塑料包装行业的发展。高速成型的研发重点是塑化注射机构、复合平行回路。节能技术的研发重点是伺服动力驱动节能系统、塑化加热节能系统、节能执行机构。能量的回收利用成为节能技术研发的又一个重要课题。创新实例说明注塑包装设备实现高速节能成型的关键是创新高速运行机构和高速成型回路。举例说明我国注塑包装设备科学发展已取得的初步成就。     

注塑包装设备科学发展的分析研究(1)

注塑包装设备的品种朝着功能化专用化方向发展,成型能力朝着高速化方向发展,控制系统朝着智能化方向发展,加工性能朝着节能化环保化方向发展。高速成型是注塑包装设备的首位加工性能,也是决定是否具有市场发展前途的标志。根据塑料包装容器的应用领域和功能特点,运用现代先进技术开发塑料包装设备,满足内需,推动塑料包装行业的发展。高速成型的研发重点是塑化注射机构、复合平行回路。节能技术的研发重点是伺服动力驱动节能系统、塑化加热节能系统、节能执行机构。能量的回收利用成为节能技术研发的又一个重要课题。创新实例说明注塑包装设备实现高速节能成型的关键是创新高速运行机构和高速成型回路。举例说明我国注塑包装设备科学发展已取得的初步成就。     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

典型煤碳燃烧特性研究和数值模拟

本文以三种典型煤的碳燃烧为研究对象，分别采用简单一维沉降燃烧方式和等温加热燃烧方式，实验研究了煤在快速加热条件下，其碳的初期和中，后期燃烧过程。以实验为基础，建立了煤的碳燃烧模型，变工况数值模拟了煤的碳燃烧过程，揭示了煤不同条件下的单颗粒碳燃烧特性。     

COMPARISON OF A PAIR OF THREE PARAMETER EQUATIONS OF STATE

The lattice fluid (LF) equation of state derived by Sanchez and Lacombe from a lattice model is compared to the empirical Peng-Robinson (PR) equation for normal alkane fluids ranging from methane to heptadecane in molecular weight. With respect to vapor pressure predictions, the equations are both good. The LF equation is superior, especially for higher molecular weight fluids, to the Peng-Robinson equation in predicting saturated liquid densities. For carbon numbers less than 6, the PR equation predicts heats of vaporization more accurately, whereas for carbon numbers greater than 9 the LF equation is more accurate than the PR one for temperatures lower than about 95% of critical.     

己内酰胺水解聚合过程模拟──双官能团酸调节剂与尼龙6组成分布

提出了有双官能团酸相对分子质量调节剂存在时己内酰胺水解聚合过程动力学模型 ,并进行了实验验证 .对不同温度下聚合产物组成和各影响因素对数均聚合度的影响进行了模拟 .结果表明 ,数均聚合度随进料中水、氨基己酸及相对分子质量调节剂浓度的增加而减小 ,其中水的浓度影响较显著 ,且在考察浓度范围内相对分子质量调节剂浓度 [R]0 ≤ 0 0 0 68mol·kg- 1 时数均聚合度基本不变 ,而 [R]0 >0 0 0 68mol·kg- 1 时数均聚合度则显著减小 .无氨基己酸及相对分子质量调节剂时数均聚合度亦随水浓度增加而减小 .