电梯制动装置

随着电梯行业的发展，世界各国对电梯运行安全的要求也越来越高，我国的电梯制造与安装安全规范对电梯制动器的要求也更加严格。     

浅谈城轨车辆制动控制系统

城市轨道交通的发展,已成为城市交通现代化的重要标志之一,地铁、轻轨等城市轨道交通因其具有快速、准时、安全、舒适、污染少、运量大、运输效率高等诸多特点,成为解决城市及与卫星城市之间的交通拥挤问题、建设现代化城市交通系统的重要手段。制动系统是城轨车辆关键系统之一,直接关系到列车的运行安全。即使列车在运行中出现故障,也要保证列车的安全。了解和学习其工作原理具有重要的意义。     

露天煤矿安全生产中大数据的分析与可视化应用

本文围绕露天煤矿安全生产大数据的分析与可视化应用进行了探讨,仅供参考。     

装载机行车制动故障分析

装载机行车制动故障分析山西省长治市市政管理处焦福全装载机须有一个制动性能良好且可靠的制动装置，才能使发动机动力得以充分发挥，提高行车速度和工作效率。但是，随着装载机运行时间延长，制动装置的制动效能及其可靠性也随之变坏，甚至完全丧失，从而使装载机的安全...     

基于不同降雨条件下露天矿边坡稳定性的分析

滑坡是我国的主要地质灾害之一,滑坡一旦发生,就会严重威胁人们的生命财产安全,造成不可想象的后果。我国煤矿的持续开采形成了大量的露天煤矿,也造成了大量的高陡边坡工程。降雨是影响此类边坡稳定性的众多因素中最关键因素之一。大量数据表明滑坡与降雨有着紧密的联系,在降雨过程中或降雨之后多数的滑坡事故因此发生。以某露天煤矿为例,简要分析了不同的降雨条件下露天矿边坡的稳定问题,并且提出了对未来的展望。     

自动扶梯驱动主机转动惯量计算

根据GB 16899-1997《自动扶梯和自动人行道的制造与安装安全规范》第12.4.4.2条要求，额定速度为050m／s的自动扶梯制动距离须在020～100m之间。自动扶梯在实际使用中，常常是通过调整制动器上的弹簧以获得不同的制动力矩满足不同提升高度对制动力矩的需要。图1和图2是常见的两种自动扶梯制动器结构简图，图1是带制动，当弹簧力一定时，电动机正转和反转制动力矩不相同，反转（对应扶梯下行）制动力矩比正传（对应自动扶梯上行）约大2倍。图2是块式制动，制动力矩与电动机运转方向无关。制动力矩与弹簧力设定有关。     

中国煤炭学会露天开采专业委员会第五届第三次工作会议在霍林河召开

2006年8月5日，中国煤炭学会露天开采专业委员会第五届第三次工作会议、第六届“露天开采青年科技奖”颁奖会、中煤劳保学会露天煤矿安全专业委员会第三次工作会议在内蒙古霍林河召开。分别来自中煤能源公司、神华集团．中电霍煤、云南省煤碳局、吉林省煤炭局等领导参加了此次会议。同时，来自全国各地的露天煤矿代表参加了会议。其中包括神华集团准格尔黑岱沟、哈尔乌素、中煤平朔安太堡、安家岭、东露天、神华胜利．白因华等大型已建．在建露天煤矿的代表，本刊记者应邀与会。     

剥离爆破在露天煤矿开采中的研究和设计

露天煤矿爆破是否良好,将直接影响到煤矿设备的完整和人员的安全。本文以具体工程为例,对露天煤矿开采剥离爆破技术进行了深入探究,以期为其他同类工程的实施提供一些有益的参考。     

浅谈电梯制动器的结构和制动力的理论分析

制动器是电梯重要的安全部件，若制动器失效，电梯不能制动，那么轿厢就会出现蹲底或者冲顶事故。本文从一宗事故的案例引伸，谈谈对电梯制动器结构要求和制动力的理论分析。供日常维修保养和定期检验参考之用。     

上上下下的安全卫士——电梯制动系统专题：电梯制动器的制动减速度和制停距离分析

电梯制动系统是保障电梯安全运行重要的组成部分，若制动器制动力矩不足，制动机构有卡阴现象或控制系统电气粘连，会造成电梯坠落，冲顶等事故，电梯的大部分运行控制和安全保护，最终要靠制动系统的动作而使电梯制停，制动器一旦投失败，电梯整个安全保护系统将可能崩溃！因此如何正确理解制动器有关问题至关重要，制动器看似简单，其结构和作用也简单易懂，但是一些人却往往在一些具体问题上容易产生模糊的概念，关于这些问题就有必要讨论，予以分清，     

Devastation of the environment by landslides activated by construction

Summary The landscape environment is presently formed by the system in which there are natural, as well as anthropogeneous components. There is natural direct and inverse relation between them. The possibility and method of construction of a technical work depends on specific natural conditions. Of decisive influence are mainly the rock relief, groundwater and geodynamic processes, which Matula (1976) terms the main components of the engineering geological environment. The natural conditions of the West Carpathians are suitable for the occurrence and development of slope movements. More than 3% of the total Slovakian area is covered by landslides and by other slope movements of a varied degree of activity. Based on actual examples of an incorrect procedure in erecting some of the ground, hydrotechnical and transport constructions the paper analyzes the causes of landslide reactivation and devastation of the environment. To avoid negative changes in the geological environment engineering geological documents are prepared for more important investment units, comprising predictions of changes induced by construction.

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Dégradation de l'environnement par la réactivation de glissements sous l'influence de constructions

Résumé Le paysage est le résultante de composants naturels, ainsi que d'influences anthropiques. Il y a un rapport mutuel direct et inverse entre ees facteurs. La possibilité de construire un ouvrage et les méthodes employées dépendent des conditions naturelles spécifiques. Les facteurs principaux sont la morphologie du site, l'eau souterraine et les phénomènes géodynamiques, que Matula M. (1976) appelle les composants principaux de l'environnement de la géologie de l'ingénieur. Les conditions naturelles des Carpates Occidentales se prêtent à l'apparition et au développement de mouvements de versants. Plus de 3% de la superficie totale de la Slovaquie sont concernés par des glissements et autres mouvements de versants d'une intensité variable. A partir d'exemples concrets de mauvaises réalisations de travaux souterrains, de barrages et d'infrastructures de transport, l'article analyse les causes de la réactivation des glissements et de la dégradation de l'environnement. Pour éviter ces influences négatives sur l'environnement géologique, on prépare des documents géologiques et géotechniques pour des travaux plus importants et qui incluent la prévision des changements provoqués par les constructions.

     

Foundation strengthening by piles constructed by means of pneumatic punches

The writers propose methods for strengthening foundations on natural bases under straitened conditions by means of driven inclined and horizontal metal pipes filled with concrete, as well as by bored piles formed in the soil and constructed by using pneumatic punches. Results of investigations of the bearing capacity of the strengthened foundations are presented.Krasnoyarsk Civil Engineering Institute. Krasnoyarsk PromstroiNIIproekt Institute. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 4, pp. 26–28, July–August, 1993.     

以质量求生存 以信誉求发展

作为全国铝塑复合板行业中的骨干企业和重要推动力量，山东信发铝塑有限公司仅仅经过几年的时间，就取得了诸多骄人的成绩。一跃成为江北生产铝塑复合板的3大主要生产厂商之一，产值过亿元，销售网络遍布全国大部分地区，赢得了同行业的普遍赞许和尊重。     

以质量求生存以信誉求发展以品牌创效益--山东信发铝塑有限公司发展纪实

作为全国铝塑复合板行业中的骨干企业和重要推动力量,山东信发铝塑有限公司仅仅经过几年的时间,就取得了诸多骄人的成绩,一跃成为江北生产铝塑复合板的3大主要生产厂商之一,产值过亿元,销售网络遍布全国大部分地区,赢得了同行业的普遍赞许和尊重.     

Water purification of dyes by ceramic membranes modified by pyrocarbon of carbonized polyisocyanate

Pyrocarbon modification of microfiltration ceramic membrane from aluminum oxide by carbonization of polyisocyanate has been carried out. The structure of pyrocarbon was regulated by means of water, glycerin and nickel chloride. Water of purified of dyes by pressure-driven method at the pressure in the range 0.5–1.1 MPa. The retention coefficient and specific capacity of modified membranes for direct scarlet varies respectively from 84.3 to 99.99% and from 0.8 to 32.5 dm³/(m²?h) and brilliant green—from 45 to 99.99% and from 2.5 to 8.8 dm³/(m²?h) and they are determined not only by working pressure, but the structure of pyrocarbon too.     

Purification of cork processing wastewaters by ozone,by activated sludge,and by their two sequential applications

Wastewaters generated in the cork processing industry were treated in continuous reactors by means of single treatments separately-a chemical ozonation and an activated sludge system-and then by both sequential processes-ozonation followed by aerobic degradation, and aerobic degradation followed by ozonation. The removals obtained in the ozonation alone were 12-54%, 65-81%, and 55-89% for the COD, total phenolics, and absorbance at 254 nm, respectively, while the consumed ozone yield ranged from 40% to 61%, and the biodegradability (BOD(5)/COD) varied from an initial 0.60 to final values between 0.68 and 0.93. The optimum hydraulic retention time and ozone partial pressure were 3 h and 3 kPa, respectively. The stoichiometric ratio was 0.56 g of organic substrate degraded per g of ozone consumed, while the rate constants obtained for the ozone disappearance and for the organic matter degradation were 4490 L g COD(-1) h(-1) and 1970 L g O(3)(-1)h(-1) respectively. The presence of hydrogen peroxide or UV radiation in addition to ozone increased the values of organic matter removal as well as the stoichiometric ratio and the rate constants. The aerobic treatment by the activated sludge system yielded COD removals between 13% and 37% for hydraulic retention times between 24 and 96 h, and the Contois model gave values of q(max)=0.14 g COD g VSS(-1)h(-1) and K(1)=22.6 g COD g VSS(-1) for the main kinetic parameters. The sequential processes increased the substrate removal efficiencies in comparison with the individual processes. These enhancements were greater in the aerobic degradation-ozonation sequence than in the ozonation-aerobic degradation sequence.     

在突破中转型在创新中提升——新疆国统管道股份有限公司发展侧记

2010年年末,国内沪市、深市的绝大部分股票都处在震荡下行中,而"国统股份"却如"黑马"般蓄势而发,走出了波强势行情.年末,二级市场交易价格创下了35.51元的历史新高,引来众多投资机构和股民的青睐和关注.     

Diagnosis of a transmission main by means of transients caused by a pump switch-off

ABSTRACT

Transient analysis is a powerful tool for the diagnosis of pressurized pipeline systems, based on the comparison of pressure signals acquired during transients with the results of analytical or numerical models. In this paper the analysis of a transient caused by a pump switch-off is used for the diagnosis of a transmission main managed by Sicilia Acque s.p.a. The measured pressure signals are compared with the results of a frequency domain based numerical model simulating the occurrence of a singularity in the system. The shown results confirm that accidental but rather common functioning conditions of pumping systems, such as pump switch on and off, can be easily and effectively used for their diagnosis.     

锅炉烟气烘干污泥焚烧发电技术经济性分析

对利用热电厂锅炉烟气烘干污泥后,与工业固体废弃物掺混作为燃料焚烧发电的技术性进行了探讨。分析了利用热电厂锅炉烟气烘干污泥取得的经济效益。     

运用XRD测定的熟料矿物通过EXCEL多元回归推算熟料强度

通过粉末法XRD检测熟料的矿物组成,运用excel数据分析工具,进行多元回归,可快速准确地推算熟料的3d强度和28d强度。