流控系统在连续搅拌混砂机中的应用

简述了自硬砂对混砂机的要求，以及混砂机的结构特点、功能与工艺流程。     

铸造车间粘土砂混砂机的应用

本文介绍了混砂机的发展历程及四种典型混砂机,分析了混砂机的混合机理,指出了混砂机的选择方法。     

铸造型砂混制生产线的设计及厂房粉尘的治理

铸造型砂混制生产线的设计及厂房粉尘的治理哈尔滨电机有限责任公司韩宪荣孙琪过去，我公司热加工事业部用于生产造型的有色合金铸造用型砂，一直是用一台Ｓ１１６型混砂机混制，该机座落于厂房中央，用吊车抓斗将堆放在地面的砂子抓到混砂机中混制，这种生产状况，存在下...     

S116混砂机辗轮轴承密封的改进

混砂机是铸造生产中造型、制芯用砂必不可少的关键设备。型砂的质量除与型砂的组成成份及配比有关外,也与混砂机的碾砂质量有很大关系。碾轮式混砂机操作方便,结构简单,使用灵活,因而广泛使用。但由于混砂机使用条件恶劣,零部件磨损很快,故修换频繁,维修工作量很大。特别是碾轮轴承的密封效     

混砂机刮板的改进

混砂机是铸造业中常用的设备,混砂机刮板刮砂优劣直接影响到混砂机的使用效果,我公司使用2台S1416型行星转子混砂机,刮板材料为45钢,工作面上堆焊有3mm厚WC耐磨层,如图1a所示。 　　在使用过程中发现,耐磨层不耐磨,用不到1周,刮板已严重磨损,混砂机底板上结砂严重,消耗功率明显提高;另外,刮板强度差,使用过程中易发生弯曲变形,造成混砂桶壁结砂增厚,也使设备负荷增大。     

混砂机电气保安装置

检修和清理混砂机,经常需要工人进入机内进行作业,由于没有保安装置,稍有疏忽,就会造成人身伤亡事故。我们针对本厂情况,在混砂机原电气线路中加设了电气保安装置(见图)。此电气保安装置的作用是:1.同汽车驾驶室用电锁控制总电路一样,在混砂机原控制线路中加装LA18-22Y匙钥式按钮,匙钥由入机操作者本人携带。     

S116型混砂机润滑与密封的失效分析及对策

本文就 S116型混砂机原主轴装置的润滑与密封失效的原因进行了综合分析,且介绍了改进方桑的特点及改进后所取得的效益。一、原主轴结构型式图19 是 S116型混砂机改进前的主轴结构。     

混砂机刮板的改进

S114型碾轮式混砂机刮板,其材质为耐磨合金铸铁,价格高。由于我厂每天用砂量达30t,混砂机刮板有时使用不到半个月就磨损,需经常更换,严重地影响了生产和车间经济效益。     

S116弹簧加压辗轮-转子混砂机

为提高混砂机生产率和改善混砂质量,我厂于75年对一台58年自制的 S116混砂机从混辗机构上进行了较大的改革。1.摘除一只辗轮,在其相应位置上安装了一个混砂转子(见图1)。转子及其支架等零部件重量之     

适合树脂砂之混砂设备的改造

近年来,国外冷硬树脂砂混砂设备发展很快,实际用于生产的多采用连续式混砂机。连续式混砂机一般分为四类:螺旋槽式、涡流盘式、双室式和Ω式。 连续式混砂机的主要功能就是连续不断地混拌出符合质量要求的树脂砂。为实现这个功能,混砂机必须具有可靠的计量、定量机构,能够按工艺规定准确、稳定地提供树脂、固化剂和原砂。我们根据本厂的特点,对原有的流态砂搅拌机进行了全面的改造,改造后的连续式温砂机如图1所示。 一、混拌机构 选用单砂单混法。在有效长度为 2500 mm 的单螺旋槽混砂器内,按程序完成原砂、固化剂、树脂的加入、混拌。 1)叶…     

静态混合器的微观研究与工业化应用进展

介绍了化工过程强化中新型化工设备--静态混合器以及计算流体力学和激光测速技术在静态混合器的微观应用基础理论中的应用和研究进展;由于静态混合器具有特殊的结构特点与传统的搅拌混合设备相比表现出了高效、节能等优点,静态混合器在硝化工业和环氧丙烷装置的扩产改造中成功应用并且取得了巨大社会效益和经济效益.     

电液一体化的比例伺服系统及其在密炼机上的应用

针对密炼机上顶栓运行速度慢、输出力小且精度差的问题,选用了可以使用两个输入变量的比例伺服阀系统,进行开环速度控制和闭环压力跟踪控制,而且是在主油路上直接调压。研究结果表明,电液比例伺服阀系统使得密炼机上顶栓实现了高强度、高速度、高精度以及无级调压等功能要求。     

Perspectives of the Development and Use of the Nonlinear Wave Technologies to Process the Energy Condensed Systems

The use of wave generators to intensify the processes of mixing and metering model energy condensed systems is studied. The urgency of this problem is specified by the imperfection of the traditional mixers and metering devices of the system components. The mathematical modeling of the wave action is performed for some model technological processes of processing and metering systems. According to the results of mathematical modeling, the preliminary parameters are estimated and new mixers and meters are developed ensuring more efficient modes of mixing and accurate vibration metering of the model energy systems.     

Scheduling and sequencing of rubber compounds on banbury mixers in a tyre company

Scheduling and sequencing compounds on banbury mixers is a daily production planning function in a tyre company. The current scheduling procedures are based on experience. A number of factors, such as, capacity, cost, time, speed, set-up of mixers, compound changeovers, density and demand of compound, have to be considered during planning. In this paper, we propose a two-stage approach to this problem. This approach can be easily computerised to aid the personnel in the planning function. An example, considering actual data obtained from the company, is used to illustrate the approach. The current scheduling practice by company personnel, as inferred from past record, is also reported.     

Numerical investigation of the effects of geometric parameters on transverse motion with slanted-groove micro-mixers

Journal of Mechanical Science and Technology - We investigated hydrodynamic phenomena inside several passive microfluidic mixers using a Lattice Boltzmann method (LBM) based on particle mesoscopic...     

PQ阀控液压系统动态特性模拟

为解决橡胶密炼机液压系统的控制能力问题,针对电液比例压力流量复合控制阀(简称PQ阀)进行了研究.集压力比例调节、流量比例调节于一体的PQ阀是现代橡胶密炼机液压控制系统的萤要组成部分,其性能的优劣将对炼胶质量有直接影响.在探讨PQ阀的结构特点及其工作原理的基础上,绘制了与系统相对应的功率键合图,建立了描述PQ阀控液压系统...     

Introduction of a chaotic dough mixer, part A: mathematical modeling and numerical simulation

The motivation of this work is to propose a special dough mixer with chaotic advection to take advantage of high performance mixing in chaotic mixers and to develop typical dough mixers. In order to prevent common difficulties encountered due to the dynamic mesh, a mathematical model was employed based on neglecting the transient term of the momentum equation using conceptual features from creeping flow. Then, the numerical simulation was performed using the bird Carreau dough model of Dhanasekharan. The mathematical model was further developed to complete the numerical procedure in order to find the required material point trajectories for assessing the presence of chaotic advection in the proposed mixer. In this approach, Lyapunov exponents were also calculated which quantify the exponential divergence of the initially close state-space trajectories and identify chaotic behavior of the system as well. The results indicated that the flow field was a combination of both chaotic and non-chaotic zones.     

Pressure drop in motionless mixers

A motionless mixer consists of a straight pipe or transfer tube containing the mixing elements that are used to cut, fold, twist, and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop new motionless mixers and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new ones. Glycerin is used as a mixing fluid. Pressure drop is measured using a hydraulic manometer and correlations of friction factor are proposed as a function of Re. The friction factors of Sulzer SMX mixer are in qualitative good agreement with the published data. On the average, the friction factors of SSC and YNU mixers are about 36% lower than and 6% higher than that of the Sulzer one.     

混铁炉倾动力矩的分析计算

对混铁炉在其运行轨迹上的各个位置静阻力矩进行分析，可以找出混铁炉倾动时所需的最大倾动力矩，然后可以选定与之相匹配的电机、制动器，以达到产品的优化设计。