方底糊口纸袋喂料装置的设计计算

介绍用于水泥等粉，粒状物品包装的方底糊口纸袋制造设备－－糊口机喂料装置的工作原理及有关的设计和计算。     

研制加膜纸袋点浆系统

为了贯彻国家建材包装“九五”改革方针,我公司董事会于1996年开了几次专题会议,进行国内外糊口袋生产设备可行性研讨分析,决定选购当时还具雏型的洛阳华天包装机械厂生产的糊口纸袋生产线,在广东省大型水泥厂内销水泥包装中率先使用糊口袋。实践表明,糊口袋比缝线袋可节纸约6％,降低成本约8％,在同样配纸情况下,抗破强度大大提高,机口破损率较缝线袋降低90％以上,性能优越,效益显著。在金羊牌水泥的名牌效应推动下,糊口袋市场在广东得到迅速推广,在短短几年内,     

低温液化气船的制冷装置—再液化装置

本文介绍了低温液化气船上的特殊的制冷装置——再液化装置，分析了再液化装置的功能、基本类型以及基本要求；介绍一个典型的再液化装置流程及设备组成     

西门子S7-200在纸袋糊口机同步控制系统中的应用

详细描述了高性能西门子S7-200 PLC在糊口机同步控制系统中的应用,根据塑编行业生产线的特点,提出了基于PID和补偿原理的多电机同步控制方案.应用结果表明,本控制系统具有控制精度高、运行稳定可靠、投资成本低等特点,能够满足高速糊口机生产线的控制要求.     

真空电弧熔炼快冷制粉装置

介绍了真空电弧熔炼快冷制粉装置以及两个重点结构—水冷双电极和磁力耦合装置     

智能电工电子综合实验装置的研制

介绍智能电工电子综合实验装置的研制目的，简述了实验装置的研制思想和总体结构以及功能说明。     

微波小功率计的校准

本文介绍了微波小功率标准装置的构成，以及每个部件在整套装置中的作用。     

石油化工装置节能优化探析

本文主要介绍了节能的概念，以及化工装置中的一些节能措施，通过减少石油化工装置能量的消耗，降低装置能耗，降低成本，提升企业竞争力。     

北斗+GPS双摸系统在机动车区间测速系统检测装置中的应用

本文介绍了机动车区间测速系统检测装置的组成、北斗+GPS双模系统在装置中的应用以及装置中的工作原理、达到的主要技术指标与不确定度评定,装置的特点等。     

机械压缩式湿垃圾处理装置设计

针对现有湿垃圾就近处理装置存在成本高、占地面积大以及垃圾处理后仍达不到排放标准等问题,研制了一款新型机械压缩式湿垃圾处理装置.首先,介绍了机械压缩式湿垃圾处理装置的功能和技术特点.然后,对机械压缩式湿垃圾处理装置进行模块化设计,主要包括提升装置、传送带分拣装置、破碎脱水装置、污水处理装置以及压块装置等.最后,对机械压缩...     

复膜塑编热合糊袋机控制系统的设计

介绍了复膜塑编热合糊袋机的工作原理,根据复膜塑编热合糊袋机工艺要求,采用西门子的SIMO-TION D435和SINAMICS S120组合,设计出了糊袋机整机控制的软硬件实现方法,并介绍了热合部分的控制程序。实际运行结果表明,该控制系统可较好地满足此类糊袋机的控制要求。     

复膜塑编袋糊袋机控制系统的设计与应用

根据复膜塑编袋糊袋机的工艺及对控制系统的要求,采用西门子的SIMOTION D435和SINAMICSS120的组合,设计了19轴的伺服运动控制系统的硬件及其软件实现方法,进一步提高了复膜塑编袋糊袋机的自动化水平。实际运行结果表明,其控制稳定性好,可靠性高,较好地满足了该类糊袋机控制的精度和稳定性要求。     

热处理中电沉积Ni-Fe合金箔粘结过程与抑制方法

Ni-Fe合金往往经过热处理才能发挥其最佳性能,但是由于电沉积法制备的Ni-Fe合金箔厚度很薄,在批量化热处理过程中极易产生粘结现象,严重影响产品质量.为了深入研究粘结机理以解决粘结问题,本文通过电子显微镜分析了合金箔粘结部位微观形貌;通过超高温激光共聚焦显微镜,原位在线研究了热处理过程中合金箔表面微观形貌演变,推测了其与表面粘结的联系;同时也对电泳MgO涂层抑制粘结的效果进行了研究.结果表明:电沉积Ni-Fe合金箔在950~1 000℃开始发生粘结;在1 000℃以上时,合金箔表面发生软化,不仅促进合金箔间的粘附结合,而且加剧了合金箔粘附界面的原子扩散,使得合金箔界面间共生晶粒生成和长大,最终导致粘结.在合金箔表面电泳涂覆MgO,可获得均匀分布的MgO涂层,可以有效起到隔离合金箔的作用,从而达到抑制粘结的目的.     

C8051F020在机载数据采集记录系统中的应用

介绍了一种基于C8051F020单片机的机载数据采集模块.该模块作为某机载数据采集记录系统的一部分,能实时地获取飞机飞行时的各种参数,为飞机试飞的状况分析提供基本的数据和信息.文中给出了该模块的软硬件构成,并详细介绍了利用GPS给采集数据贴上精确时间标签的方法.     

Multiscale analysis of silicon carbide-chemical vapor deposition process

A kinetic study, which was performed by using multi-scale (a macro and a micro-scale) analysis, is presented in order to determine the reaction mechanism of the chemical vapor deposition (CVD) of silicon carbide (SiC) from CH3SiCl3 (MTS)/H2 gaseous mixture. The multi-scale analysis provides two well-defined reaction fields, corresponding to the flat substrates placed in a hot wall reactor and micro trenches on the substrate surface, with centimeter and submicron characteristic length scales, respectively. The microcavity method is a micro-scale analysis used to study the relative contributions of gas-phase and surface reactions to the SiC growth, and to determine the sticking probability of growth species in CVD reaction systems. From the macro-scale analysis, activation energy of the growth rate was estimated to be 43.0 kcal/mol at the up-stream part and the sticking probability was estimated to be 9.5 x 10(-7) at 1273 K and 6.8 x 10(-6) at 1373 K. On the other hand, we examined a sticking probability (eta) and the reaction mechanism by using the microcavity method. From the micro-scale analysis, we found that at least two growth species, a stable intermediate 1 (eta 1, = 1.3 x 10(-3) at 1273 K and 4.5 x 10(-3) at 1373 K) and a highly active intermediate 2 (eta 2 = 2.0 x 10(-1) at 1273 K and 5.4 x 10(-1) at 1373 K), are formed as byproducts of the gas-phase reaction. Activation energy of the sticking probability was 43.9 kcal/mol in the case of the intermediate 1 and 34.5 kcal/mol in the case of the intermediate 2. We could also confirm that the source precursor, MTS, was not the film growth species. Another analytical model based on Monte Carlo simulations correlates the film profile in the microcavity to the sticking probability of the deposition species. The combination of these two analysis techniques presents an overall picture of the reaction scheme.     

多约束碰撞振动系统的粘滞运动分析

建立了一类多约束两自由度碰撞振动系统力学模型,根据同一时刻粘滞振子的个数,将所研究的模型划分为四种运动系统,并分析了各个系统的运动。在一定的参数下,由于粘滞振子的个数及其进出粘滞状态的先后顺序不同,系统会出现不同类型的周期粘滞运动,对各个运动系统之间的切换及切换条件进行了分析。当系统中所有的振子同时处于粘滞状态,系统会出现暂时的"静止"。通过对碰撞面上振子的受力分析,我们发现当约束分别布置在振子的两侧时,两振子同时粘滞的受力条件不满足,因此不会出现同时粘滞,并给出了证明;当约束位于振子的同一侧时,通过对系统参数的调节,系统会出现暂时"静止"。最后给出了所研究模型的算例验证,并对数值模拟结果进行了分析。     

Effects of high-temperature hardness and oxidation on sticking phenomena occurring during hot rolling of two 430J1L ferritic stainless steels

Effects of high-temperature hardness and oxidation on sticking phenomena occurring during hot rolling of two STS 430J1L ferritic stainless steels were investigated in this study. Hot-rolling simulation test was conducted using a high-temperature wear tester. The sticking started from the initial nucleation stage in which the rolled materials were stuck onto the roll specimen surface, proceeded to the growth stage in which stuck fragments grew further, and reached the saturation stage. The modified 430J1L steel had a smaller number of sticking nucleation sites and slower growth rate than the conventional 430J1L steel because of higher high-temperature hardness, thereby leading to less serious sticking. When the simulation test was conducted at 1070 °C, Cr oxides were formed on the surface of the rolled materials, and thus the sticking was drastically reduced because of the increased surface hardness of the rolled materials. In order to prevent or minimize the sticking, thus, it was suggested to improve high-temperature properties of stainless steels in the case of hot rolling at 900–1000 °C, and to promote the formation of oxides in the case of hot rolling at temperatures higher than 1000 °C.     

Systematic study on the influence of growth parameters on island density exponent,size distribution and scaling behaviour

We present the Monte Carlo simulation of submonolayer film growth during molecular beam epitaxy (MBE) at low temperature. We have made systematic study to see how the parameters diffusion to flux ratio (D/F), diffusional anisotropy (DA) and sticking anisotropy influences on island density exponent (χ), size distribution and scaling behaviour. We have found that, as diffusional anisotropy changes from DA = 1 to DA = ∝, the density exponent changes from χ = 0.34 ± 0.01 to 0.28 ± 0.01 for isotropic sticking case but when sticking is anisotropic the density exponent changes from χ = 0.31 ± 0.01 to 0.24 ± 0.01. The influence produced by DA on island size distribution is observed to depend on D/F ratio and sticking anisotropy. Depending on DA values and D/F ratio, the size distribution is also observed to be insensitive to the change in diffusional anisotropy. We also study the influence of diffusional anisotropy on scaling function for two sticking anisotropy condition. The scaling behaviour of island size distribution is observed to be not affected by all diffusional anisotropy as well as sticking anisotropy condition.     

Optimization of a variable mouth acoustic horn

By using boundary shape optimization on the end part of a semi‐infinite waveguide for acoustic waves, we design transmission‐efficient interfacial devices without imposing an upper bound on the mouth diameter. The boundary element method solves the Helmholtz equation modeling the exterior wave propagation problem. A gradient‐based optimization algorithm solves the resulting least‐squares problem and the adjoint method provides the necessary gradients. The results demonstrate that there appears to be a natural limit on the optimal mouth diameter. Copyright © 2010 John Wiley & Sons, Ltd.