“零线的重复接地”的理解和探讨

1标准、法规对“霉线的重复接地”的规定 1.1《检规》的规定 （1）中华人民共和国国家质量监督检验检疫总局2002年颁布的《起重机械监督检验规程》（简称02检规）〈桥架型部分〉第6．7．2条规定：当起重机供电电源为中性点直接接地的低压系统时,整体金属结构的接地型式应采用TT、TN接地系统;零线重复非接地的接地电阻不大于4欧,零线重复接地的接地电阻不大于10欧。     

浅析起重机的保护接地检验

起重机是起重机械的一种,俗名吊车,多用于以水平或平行的方式搬运重物,常间歇交替性工作。近年来起重机等设施已被愈发广泛的使用,在方便了工作方式与提高工作效力的同时,也带来了众多的安全威胁,造成了数额不小的经济减损。对此,国家质量监督检疫总局已经制定了关于起重机械包括起重机的使用规范,并已执行于今日的使用中。本文主要针对起重机的重点保护,即保护接地展开,首先对起重机的保护接地进行简要介绍,而后浅要对起重机的保护接地检验进行分析。     

探究物联网技术在起重机械检验中的应用

物联网技术的快速发展和广泛普及,在起重机械检验工作中发挥着非常重要的作用.将物联网技术应用于起重机械的检验工作中,对提高起重机械设备的检验工作有着明显的促进作用.本文分析了对起重机械检验工作流程出现的问题进行阐述,提出了物联网技术在起重机械检验工作中的有效应用策略.     

关于电梯、起重机械接地系统的分析

接地是电梯和起重机械必不可少的一种保护措施.它的形式随着供电方式的不同而不同.本文以电梯和起重机械为研究对象,就不同的供电方式采用不同的接地形式作了简要分析.     

浅谈起重机械高强度螺栓连接副及其检验

分析了起重机械高强度螺栓连接应遵循的原则,并简要介绍了起重机械高强度螺栓连接副的检验内容和检验方法。     

起重机械的电气检验相关问题思考

文章针对起重机械的电气检验一题进行研究，并总结出了几点可行性较高的相关保护措施。其中包括总动力电源的失压保护、主隔离开关的保护、总电源的短路保护、切断总动力电源紧急开关的保护、电气设备间接接触电击的保护以及线路绝缘和接地的检验等等，以期能够对各位同仁带来一些具有参考性的意见。     

起重机械接地电阻的测量方法

本文分析了接地电阻的测量误差,并介绍起重机械接地电阻的测量方法。     

起重机械接地电阻的测量方法

本文分析了接地电阻的测量误差,并介绍起重机械接地电阻的测量方法.     

起重机械检验中存在的问题及解决措施探析

本文重点对起重机械检验中存在的问题进行了研究。首先介绍了起重机械检验的重要性;其次,分析了起重机械检验中存在的问题;最后,根据检验中存在的问题状况,对解决这些问题的对策进行了探讨。     

基于案例的起重机械现场检验顺序分析

起重机械是被广泛地应用于各种物料的起重、运输、装卸、安装等作业中,是现代工业生产不可缺少的设备。其广泛地应用在室内外仓库、厂房、码头和露天贮料场等处。通过对起重机械现场检验案例的分析,提出现场检验顺序的重要性及解决方法     

A quick switching sampling system by variables for controlling lot fraction nonconforming

This article develops a new sampling scheme by variables inspection, namely a quick switching sampling (QSS) system based on the process yield index for lot determination when the quality characteristic is normally distributed with two specification limits. The QSS system can provide a flexible sampling procedure by switching decision policies, normal inspection and tightened inspection. The operating characteristic curve of the proposed QSS system is derived and required to pass through two designed points, acceptable quality level and limiting quality level for satisfying risks simultaneously suffered by the producer and the consumer. The proposed sampling system’s performance is investigated and a comparison with the conventional variables single sampling (VSS) plan is also examined. The results indicate that the proposed system outperforms the VSS plan by requiring a smaller sample size for inspection while retaining the same protection. For practical purposes, the plan parameters’ tables are provided on the basis of various selected quality requirements and risks. Finally, we demonstrate the proposed sampling system using an example taken from a silicone LED lens industry.     

A study of a two-phase inspection policy for a preparedness system with a defective state and heterogeneous lifetime

This paper considers an inspection policy for a single component protection or preparedness system, in which the component arises from a heterogeneous population. At any point in time, the system may be in one of three states, good, defective or failed. The system is only required in an emergency, and in order to ensure high availability of the system on-demand, the system undergoes a sequence of inspections. Inspection determines the system state, so that if a transition from the good state occurs between inspections it is not revealed until subsequent inspection. When a defect or failure is revealed, the component is replaced. At the final inspection the component is replaced. We suppose that a component may be either weak or strong, so that the time in the good state has a distribution that is a mixture. In these circumstances, the efficacy of a two-phase inspection policy, with an anticipated high inspection frequency in early life and low inspection frequency in later life, is considered using availability and cost criteria. The policy is investigated in the context of a valve in a natural gas supply network. If the lifetime distributions in the mixture are quite distinct, then cost savings of the order of 5% can be achieved by using the two-phase policy in place of the simpler single phase policy. Furthermore, only if the mean time in the defective state is small or the required availability is very high does the two-phase policy tend to mimic a burn-in policy.     

Economic development of specifications for 100% inspection based on asymmetric quality loss functions

As a means of providing protection for both the producer and the consumer, for example as in airport security, 100% inspection plays an important role in today's environment. The same is true for some industrial or other decision-making processes where the consequences of excessive deviations from target values are very high. Motivated by Deming's “all or none” inspection rule and associated philosophy for quality improvement, we develop an inspection strategy by considering the costs to both the producer and the customer, and thus to the whole system. A general optimization model is formulated to determine whether 100% inspection is to be performed or no inspection to be performed. If complete inspection is chosen then the optimal specification limits can be determined at the same time. Specifically, we consider two types of asymmetric quality loss functions for the “target the best” quality characteristic: the asymmetric quadratic quality loss function, and the asymmetric piecewise linear loss function. For each loss function, we propose an optimization model to determine the optimal process mean and specification limits. Numerical examples are given to illustrate the proposed models that can be used to improve the quality of the output of any process.     

可全程越障架空输电线巡线机器人设计

针对现有巡线机器人无法完全跨越所有地线障碍物的现状,提出一种新的巡线机器人越障方案.巡线机器人由单臂机构提供行走驱动力,双臂机构完成越障任务.该方案具有跨越所有障碍,且越障时动作简单,所需驱动力少的特点.通过理论分析及软件仿真的方法对巡线机器人越障关键环节进行分析,得到机器人越障过程的运动特性.在此基础上,制作出试验样机,并在模拟线路上进行越障实验,结果表明:该设计方案能完成预定的越障功能.证明了这种新的越障方案的有效性及可行性.     

Cracking in aluminum gas cylinders: A review of causes and protection measures

Cracking in a limited number of common portable aluminum gas cylinders has led to leaks and, on occasion, to violent and sometimes fatal failures. This paper describes the failure process and develops a model for crack growth. The model crack growth rates are much higher than those previously determined by small specimen testing. The levels for a threshold stress intensity below which no growth can occur are also introduced. The inspection procedures and protection strategies for the aluminum gas cylinders are discussed. The system has become both cumbersome and possibly expensive for what it is achieving. There has been no cost benefit assessment of the entire system.     

土壤源热泵在中央空调系统中的应用

简要介绍了土壤源热泵的工作原理及特点，并以实际工程为例，探讨了土壤源热泵应用于中央空调系统的设计方法及运行情况，指出了土壤源热泵技术对节能和环保具有重要意义。     

In-situ inspection of cracking in atomic-layer-deposited barrier films on surface and in buried structures

Thin inorganic barrier films deposited on plastics are essential to provide protection from moisture- and oxygen-aided degradation while maintaining a flexible substrate. Mechanical bending of the barrier films, causes stress-induced cracks that may lead to significant reduction or loss of barrier protection. In-situ characterization of film cracking on the nanoscale, transparent, and conformal atomic-layer-deposited (ALD) thin films is challenging especially when these films are in a buried layer structure. We developed a technique that can inspect in real-time the cracking of the stressed barrier films using laser scanning confocal microscopy. The in-situ inspection avoids the inaccurate measurement of the crack onset strain associated with the crack “close-up” phenomenon. SU8 cover-coat is applied to form a buried ALD layer structure and in-situ inspection demonstrates the cracking of the ALD film in real-time underneath the cover-coat. This technique is nondestructive, versatile, and allows rapid and large-area inspection of different types of barrier films.     

延时分辨率对超声相控阵检测性能的影响

超声相控阵检测技术是近年发展起来的一种先进的无损探伤方法,阵元间的延时分辨率是决定超声相控阵检测系统性能的关键因素,通过研究延时分辨率对相控阵检测效果的影响,可以得到延时分辨率和相关性能参数之间的对应关系,从而提高超声相控阵系统的检测性能。     

IVECO车身视觉检测系统现场溯源研究

汽车车身视觉检测系统是大型、专用的车身总成三维尺寸自动化检测设备,系统组成复杂,测量误差难以确定。本以南京ＩＶＥＣＯ车身视觉检测系统为背景,提出了一种现场溯源技术,解决了测量结果不确定度的溯源问题。     

基于RFID技术的运动器械包装生产线检验系统设计

目的针对传统人工方法进行运动器械生产线检验存在的缺点,设计一种用于运动器械出厂包装生产线的检验系统。方法将RFID射频技术、可视化软件和数据管理技术进行结合,利用RFID高效读写功能对生产线上输送的出厂器械进行有效的产品检验、产品管理和人员管理,以提升生产工厂智能化水平。结果经实际运行验证,该系统可自动完成40台器械产品的检验管理。结论所设计的检验系统运行稳定可靠,可以有效提升检验效率。