混凝土搅拌运输车随动托轮的设计

通过对混凝土搅拌运输车托轮机构常见问题的研究,总结了托轮被损坏的主要原因,设计了一种随动托轮结构,该结构能使托轮装置的滚轮轴线随着搅拌筒轴线方向的变化而变化,有效保证了滚道与滚轮之间运动副的良好接触,减少了托轮和滚道的损坏,延长了使用寿命。     

路面机械

<正>GJ20176022 JLB200型胶凝砂砾石拌和设备[刊,中]/王日东…//工程机械.-2017,(9).-1～5介绍JLB200型胶凝砂砾石拌和设备的主要技术参数、结构组成及工艺流程。实践证明,此设备具有可连续拌和、可移动、可智能控制的优点,解决了制约胶凝砂砾石坝发展的瓶颈问题,不但     

燃气导热油热源站高温循环泵筒体结构数值分析

为提高燃气导热油热源站高温循环泵安全可靠性能,满足350℃高温高压恶劣作业工况,改善耐冲蚀性能及延长使用寿命,采用有限元法对高温循环泵筒体在水压、热结构耦合工况数值分析;制定泵体水压及整泵运行工况性能试验方案。结果表明:筒体在水压及实际运行工况下最大应力分别发生在筒体与密封冷却腔焊接处、出口管与筒体相贯处,安全系数均大于设计要求并有足够安全裕量;通过模态分析获取筒体前六阶固有频率及振型,为避免筒体结构发生共振提供理论依据;同时试验方案验证了筒体与冷却腔体焊接式结构无泄漏、无变形、无异响,密封性能良好,完全满足燃气导热油热源站高温循环泵应用运行要求。     

新型结构单绳冲抓斗设计

在现有单绳冲抓斗结构的基础上提出了一种新型结构的单绳冲抓斗,其采用圆柱式筒体结构,锥形斗头及焊接式斗壳。优化了结构,提高了挖掘效率,降低了成本。     

基于ANSYS Workbench的新型轨行式混凝土搅拌车搅拌筒优化设计

以6 m3轨行式混凝土搅拌车为例,介绍了搅拌车结构组成。利用Solid Works软件建立了搅拌筒的结构模型,借助ANSYS软件对搅拌筒进行应力和变形分析,结果显示:搅拌筒的结构不能满足材料的强度和刚度要求。通过结构优化,最大应力减少了大约24%,实现了延长搅拌筒使用寿命的目的。通过目标驱动优化,获得了筒体厚度、载荷与最大等效应力最小值之间的关系。     

混凝土搅拌运输车搅拌罐辅助滚道磨削机

<正>配置双滚道多托轮搅拌罐的混凝土搅拌运输车,是近几年有关生产厂家开发的一款新产品。双滚道搅拌罐设有主滚道和辅助滚道.其中主滚道安装在搅拌罐后锥体外部,辅助滚道安装在搅拌罐中筒外部。双滚道多托轮结构增加了搅拌罐运行的安全性和平稳性。辅助滚道由条形钢板卷制而成,使用我们自制的辅助滚道成形机将辅助滚道成形后,     

加工大直径搅拌机筒体的方法

一、产品综述 现有外协加工件φ1572mm搅拌机筒体,该筒体坯件为铆焊件,最大回转直径为φ1572mm,总长1890mm,前后两滚道用65Mn钢板焊接,是简体上的加工面,钢板厚度δ=16mm,要求前后滚道加工后,任何一处壁厚不小于10mm。 二、机床的改造 1.现有设备状况 我单位现有机床最大回转直径仅有800mm,远小     

压缩式裸眼封隔器胶筒密封结构研究

水平井裸眼分段压裂完井技术的核心工具之一是压缩式裸眼封隔器,由于封隔器处于高温、高压、复杂深部地层环境,常出现坐封压力低、坐封提前失效,主要原因是封隔器的密封结构不合理,胶筒与井壁间的接触应力低。基于弹性力学理论,推导出封隔器胶筒坐封时受到的最大接触压力,并提出了一种新型压缩式裸眼封隔器四胶筒组合的密封结构,利用Abaqus对比分析了常规和新型组合胶筒在相同条件下的接触应力分布规律,并对新型组合胶筒的端面斜角进行了优选,研究了摩擦因数对新型组合各胶筒接触应力的影响。分析表明,新型四胶筒组合封隔器能更加有效的将坐封压力传递给密封胶筒,使胶筒的接触应力显著提高且分布均匀,保证了胶筒密封的可靠性。     

新型谐波减速器柔轮结构分析设计

谐波减速器柔轮作为核心部件,其强度和使用寿命决定整个谐波减速器的工作性能.为了提高其寿命和承载能力,提出一种新型分体式柔轮结构.该结构基于传统的长筒型柔轮,将原先整体的柔轮杯体分成筒体和卡盘两部分,通过筒体上的卡爪与卡盘间的相互配合,共同组成一个新型杯体.首先建立柔轮的三维模型,然后导入ANSYS Workbench平台,并对所提出的新型分体式结构和整体式结构进行仿真对比分析.结果表明:在二者各结构参数相同的情况下,新型分体式结构在最大等效应力方面相对于传统的整体式结构有一定降低,进而有效提高了柔轮寿命.     

新型封隔器胶筒橡胶本构模型选择及结构参数优化

传统的封隔器结构一般由刚性隔环分割的两个或三个长胶筒叠加而成,因此,装配要求较高且中上胶筒压缩后肩突严重。为了解决这个难题,通过去除刚性隔环,胶筒间采用倾角配合,上下部分增加铜背圈和支撑环等方式,对封隔器结构进行了改进。对制造胶筒的两种橡胶进行拉伸试验,并用高弹性本构模型对试验数据进行拟合,选取拟合效果最好的本构方程代入有限元软件Abaqus,对新型封隔器结构参数进行分析。得到了铜背环与胶筒配合倾角、中胶筒高度对接触应力的影响规律。最后,将新型封隔器与传统封隔器进行密封性能对比,证明了所采用的优化方式的有效性,为后续封隔器结构优化提供了思路。     

现代制造技术中的八大关系

技术与资源,环境,管理,技术与人,工程教育,乃至技术与人类文明等八个方面之间的有机联系,预示在研究现代制造技术的同时,应思考一些比技术本身更重要的问题,从而拓宽先进制造技术的内涵,以利更有效地发展制造工业。     

Dynamic programming approach for analyzing delayed product differentiation

Cutting down lead-time and expanding product variety are two essential means to improving customer service. To recognize the specific requirements of markets, many computer companies are adopting a build-to-order (BTO) policy. Under this policy, original equipment manufacturing (OEM) companies that are component suppliers for these computer companies are compelled to offer their components near the end-users within shortened lead-times. This forces the OEM companies to develop their branches and warehouses that can implement some assembly operations for the products that have been semifinished at the central company. The main problem faced by these OEM companies is determining the differentiation point of the production processes where the products are diversified at the central company. In this paper, a dynamic approach is proposed to construct an analysis framework for this problem. This approach can deal with situations that do not differentiate all products at the same time. This is especially relevant when the investment cost or processing cost for process normalization and modularization of process redesigning is dependent on products in common parts or sets or on their differentiation sequence. This approach is different from the results claimed in previous research. An example of a real case is then applied to illustrate the applicability of the model.     

我国企业市场营销策略的新趋势

结合我国经济发展和市场营销现状，重点介绍了今后可能成为我国企业市场营销策略发展的三种新趋势：涡轮营销、绿色营销和定制营销，希望能对我国企业的营销实践提供一些有益的借鉴与启发。     

谈国有企业人才资本的开发与运用

人才资本的开发和运用关系到企业的生存和发展。文章从建立人才管理机制、营造人才成长环境等方面阐述企业开发人才资本的方法和措施。     

注塑产品与模具协同设计任务规划算法研究

协同设计支持多功能小组兆同参与一个产品的设计过程,在产品开发的初始阶段,合理的任务规划将有利于协同设计的顺利进行,从而提高设计效率与质量。对协同设计任务规划系统开发的关键技术进行研究,采用模糊设计结构矩阵描述设计子任务的耦合关系,提出了新的模糊排序算法指导设计过程的分解与重组;基于综合能力、兴趣和时间约束分配设计任务,并根据协同设计过程的并行度与耦合度测定,提出了新的协同设计任务调度的时间分配策略。最后以注塑产品及模具协同设计为对象进行了验证。     

应用FIAstar5000和透析膜测定牛奶及乳制品中的亚硝酸盐和硝酸盐

样品在热萃取缓冲溶液中,是悬浊液。离心分离并快速冷却分离出脂肪。脱脂后的溶液注射到流动注射分析系统中。系统内透析膜用来除去蛋白质和残余脂肪。通过镉将硝酸根离子还原至亚硝酸根离子。在一个酸性的对氨基苯磺酰胺溶液中,亚硝酸根形成偶氮化合物。它与N-（1-萘基）-乙二胺二盐酸盐（NED）结合形成紫色的含氮染料,在540nm处进行测定。此方法为测定牛奶亚硝酸盐和硝酸盐的常规方法,检出限可达0．02mg／kg,RSD〈10,回收率〉90％。     

Embedded components in printed circuit boards: a processing technology review

It is evident that embedded passive components (EPCs) allow packaging substrate miniaturization and have the potential to reduce costs. Moreover, they exhibit superior electrical behaviour with respect to the minimization of parasitic effects. However, as for most emerging technologies, there is no well-established process or method for EPCs that lead to the desired result, but many have been and are still being investigated. This article attempts to review the state of the art of resistor and capacitor EPCs, including an assessment of the pros and cons of the various technologies pursued.In the review, it is found that compared to discrete surface mount devices, EPCs provide (in order of current importance): space reduction of 30% or more, better HF signal integrity and potential cost reduction. Embedded resistors in thin-film technology are, in general, restricted to small resistance values up to a few k. Embedded resistors in ceramic thick-film technology require a high temperature curing process and much care during lamination, but they can be combined with embedded capacitors and exhibit high stability. Whereas embedded resistors in polymer thick-film technology require a low curing temperature and can be combined with capacitors, they exhibit poorer electrical properties and stability. Moreover, tolerances of embedded resistors after manufacturing are exceeded by 15%, independent of the manufacturing technology, which means that laser trimming is required.Embedded capacitors are based mostly on barium-titanite with a dielectric constant of only approximately 20, which limits the capacitance density to a few nF/in². Ferroelectric material with a dielectric constant up to 2000 for embedded capacitors has been investigated but not yet established. Besides the traditional screen print technology for the deposition of pastes and inks, the ink-jet technology becomes more promising. Much higher flexibility with respect to material composition, layer thickness and even active components like LEDs have already been produced by ink-jetting.     

ICP-AES法测定钢铁及合金中痕量钪

本方法用硝盐酸分解试样,ICP-AES法直接测定钢铁及合金中的痕量钪。方法简单、快速,干扰少,灵敏度高。测定下限达到0.00005％,测定精度在10％内。     

论服务营销中的7Ps策略

随着服务经济的发展，服务营销的概念应运而生，现在已成营销的热点。针对无形服务论述。在4Ps的组合上还应再加上三个要素：人员、顾客服务的提供和过程，即服务业的7Ps营销组合。     

再制造产品的磨合试验工艺与技术

再制造产品的磨合及试验是检验并保证再制造产品质量、提高产品市场竞争力的重要手段，在再制造生产中具有重要作用。本文阐述了再制造产品磨合试验的基本概念及其影响因素，叙述了再制造产品磨合试验的3个阶段，最后给出了再制造产品整装试验的要求及系统组成。