连锁挡车栏设计研究

煤矿井下倾斜井巷串车提升运输事故多发、安全设施不完善,经常会出现跑车事故。为此研制了一种新型斜巷挡车联动安全装置,实现挡车装置的常闭、连锁;使其操作方便、省力、实用。操作时一次只能打开一处挡车栏(一开一闭),车组进入斜巷前,打开挡车栏,车组通过斜巷变坡点后操作手把复位,挡车栏自动关闭,由于使用了定滑轮和利用平衡原理,可有效平衡挡车栏重力,达到操作省力的目的。     

可编程控制器在跑车防护系统中的应用

文章通过对现有矿用跑车防护系统装置的介绍与分析,联系煤矿安全生产实际,提出了一种新型的改进的跑车防护装置——双余度常闭型斜井防跑车装置,并详细介绍和分析了装置的原理、结构以及技术特点。     

KFZ102矿车即时防跑车装置应用研制

随着科学发展、安全发展观念的深入人心,矿山企业的安全生产日益引起社会的重视与关注。目前国内斜井矿车防跑车装置各具特色,但因有电子元件,使得安装、调试、维护繁杂,抗尘、抗腐蚀性能差,性能不稳定等原因而难以推广。KFZ102矿车即时防跑车装置是纯机械装置,具有安装简便、维护方便、性能可靠、可实现即时抓捕等诸多优势,可广泛应用于各类矿井提升系统。     

基于PMC控制的数控车削实训安全防护装置设计

数控车削实训可以提升学生的实践动手能力,激发学生的实践创新能力。由于数控车削实训涉及教学内容较多,且要求学生独立操作数控设备,具有一定的安全隐患。该文通过分析传统教学安全措施,并梳理数控车削常见安全隐患及其发生原因,结合数控车削实训实际情况,提出了基于可编程机床控制器（production material control, PMC）控制的数控车削实训安全防护装置。使用数控机床自带的PMC实时监控实训工量器具,设置一定的逻辑关系控制主轴的启动,以实现安全防护目的;通过“指纹授权+逻辑关系”协助实训指导教师进行管理,达到规范管理目的。实践证明：该安全防护装置能有效减少实训安全事故的发生,提升学生职业素养,降低实训指导教师的劳动强度。     

一种新型机械式车库升降机的设计

针对目前机械式立体车库中存在升降机井道宽度较窄、基坑尺寸较浅等等问题,设计了一种新型机械式车库升降机.该机械式车库升降机主要由钢结构、轿厢、配重、传动系统、导向装置、安全防护装置等组成.并根据载重质量,对车库升降机的传动系统进行了设计计算.     

斜井跑车事故原因分析与预防

本文作者通过对跑车力学的分析．提出斜井跑车的严重危害,对斜井跑车事故发生原因进行了系统分析,在此基础上给出了相应的预防措施．为斜井提升系统安全管理提供了科学依据。     

多工位电液联动控制木工跑车系统的设计

针对目前木工跑车控制系统普遍存在的人力搬运、手动控制的缺陷,本文采用电气、液压等技术重新改进设计跑车系统,通过电气控制系统和液压驱动装置,完成对木工跑车系统工作环节的多工位联动控制,使整个控制过程趋于全自动机械化流程,不仅降低了工人劳动强度,缩短了新产品更新换代周期,节省了企业生产资源,降低了企业运行成本。高度自动化的新一代跑车系统,改善了产品品质,提升了企业形象,体现了企业发展的活力与竞争力。     

矿井智能化永磁变频运输绞车的设计研究

煤矿井下运输绞车承担着材料设备的运输功能,运输绞车尤其是斜巷使用的运输绞车能否安全运行,不仅直接影响矿井的生产,更与矿山安全息息相关。本文设计的智能化永磁变频运输绞车,以永磁变频系统（PVD）技术为核心,永磁同步电机、变频器及矿用防爆提升机智能电控装置为硬件基础,集成了无线视频监控及防人员误入系统,具有智能化、安全可靠、结构紧凑、传动效率高、噪音低、使用寿命长等诸多优点,广泛适用于矿山的各种工作环境。     

规范国内高校实验室射线装置管理防护工作的探析

在射线装置辐射安全管理工作方面经过不断研究和探索实践,逐渐形成了一套切实可行的管理办法,在进一步加强安全管理、提升自我保护意识的同时,确保了射线装置在实验教学、科学研究中发挥应有的作用,为人才培养和科研提供良好、安全的环境。     

基于普通车床教学安全的思考

普通车床教学实训中存在安全问题,作者主要从断电安全防护装置、卡盘防护罩、限位行程开关三个方面探讨如何保护实习学生的安全和设备的安全从而保障课堂的有效进行等问题。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.