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针对钢丝绳在恶劣的煤矿作业环境中受到各种冲击载荷容易发生断丝损伤的情况,采用了与原漏磁检测技术不同的金属磁记忆检测技术对断丝缺陷的部位进行探测,并且对金属磁记忆技术的检测装置进行了设计,对其相关检测电路也进行了优选,设计出符合检测装置的各类电路图。试验数据表明,金属磁记忆检测技术能高效判断缺陷位置,为开展金属磁记忆检测工作提供了支撑依据,保障煤矿企业安全生产常态化稳定。 相似文献
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Q235钢材料拉伸时磁记忆效应的试验研究 总被引:2,自引:1,他引:1
铁磁性金属材料广泛应用于锅炉、球罐等压力容器以及其他工业设备中,为了探讨金属磁记忆技术应用于典型铁磁特性材料时表现出的磁记忆特征,探索该技术在弱磁性材料上的工程实用性,对Q235钢材料试件拉伸过程进行了磁记忆检测试验。利用金属磁记忆方法对Q235钢材料拉伸过程的不同阶段进行磁场检测,得到该材料在不同阶段的磁信号,分析磁记忆曲线并确定材料的应力集中情况,从而验证了金属磁记忆检测方法的可行性。 相似文献
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金属磁记忆检测技术(Metal Magnetic Memory Testing)是一种利用金属磁记忆效应来检测部件应力集中部位的无损检测方法。它能够对铁磁金属构件内部的应力集中区,即微观缺陷、早期失效和损伤等进行诊断,防止突发性的疲劳损伤。金属磁记忆检测技术是迄今为止对金属部件进行早期诊断唯一行之有效的一种无损检测新方法。选择适当的特征值对磁记忆信号进行分析,可以准确可靠地探测出被测对象上以应力集中区为特征的危险部位。介绍了金属磁记忆技术理论,并总结了用于机械设备早期故障诊断的特征值。 相似文献
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金属磁记忆检测的原理及应用 总被引:1,自引:0,他引:1
金属磁记忆检测技术是一种新型无损检测方法。文章介绍了磁记忆的原理及与传统无损检测方法相比金属磁记忆的主要特点,通过几个应用实例的介绍,表明金属磁记忆检测方法对电站锅炉、压力容器管道及紧固螺栓等构件由应力集中所造成的早期损伤进行检测具有可行性,并可望在实际工程检测中得到推广应用。 相似文献
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应用金属磁记忆检测技术,对某石化公司炼油厂氢气压缩机组的气缸盖断裂螺栓进行了现场检测。在对往复压缩机气缸盖螺栓进行强度分析和动载荷计算的基础上,应用磁记忆机理分析了螺栓断裂的原因,给出了螺栓及其断口的磁记忆信号分布特征。应用金相检测验证了金属磁记忆技术对气缸盖螺栓及其断口检测结果的正确性,并进一步研究了应用磁记忆特征分布信号进行螺栓疲劳断裂及断口分析、追查事故原因的可靠性。 相似文献
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本文选择了硝酸、王水、逆王水,进行碳钢、低合金钢溶样条件试验,以谱线强度为指标,溶解酸种类、溶解酸浓度、溶解酸用量、定容酸用量等四因素为变化条件,各因素中有三水平,即按正交实验表L_9(3~4)进行试验,编制计算程序,快速、科学地优选出最佳溶样条件—30ml NHO_3(1+5v/v)和3ml HCl,ICP-AES法同时测定铝、砷、铬、钴、铜、磷、锰、钼、镍、硅、锡、钛和钒13种元素。为确定测试方法的重复性(r)和再现性(R)而进行精密度试验。精密度数据是由10个实验室对7个样品作试验确定的。方法的回收率为94%-105%。精密度在8%以内。 相似文献
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采用ICP-AES法测定GH3128合金中硅、锰、钨、钼、铬、钛、铝、铁、锆等多种合金元素。系统研究了各元素4条分析谱线的光谱干扰情况,根据光谱干扰研究结果和分析谱线的灵敏度、信背比以及等效离子浓度等进行了分析线的选择。采用柠檬酸络合钨,基体匹配法消除共存元素干扰,效果良好。 相似文献
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Mott scattering factors are needed for the quantitative interpretation of elastic scattering phenomena in electron spectroscopy and microscopy. The inelastic mean free path of electrons has been deduced from the elastic peak intensity. The theoretical approach is based on the effective elastic cross section derived from the differential elastic cross sections. In the present work they are calculated using the partial wave expansion method, supplying as well the Mott scattering factors. Tabulated data are presented for a number of elements and 500–3000 eV electrons in steps of 2° or 5° of the scattering angle θ. The effective and total elastic scattering cross sections are also presented. 相似文献
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石油焦中Fe、Ni、V、Na、Si、Ti的ICP-AES测定 总被引:1,自引:0,他引:1
本文提出用ICP-AES法直接测定石油焦中Fe、Ni、V、Na、Si、Ti含量,该测试方法能满足我厂石油焦中金属元素的检测,测定结果的准确度和精密度均满足分析要求。 相似文献
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《仪器科学与技术》2013,41(4):439-440
ABSTRACT This paper presents some results of experimental research addressing the influence of different thermal insulation fillings on dynamic properties of industrial resistance temperature probes, based on a thin-film platinum resistance temperature detector. The experiments were carried out with four jacket thin-film resistance temperature probes, all having identical protection tube geometry, yet differing in the thermal insulation filling materials. Further, a comparison between transient response characteristics in water established experimentally and those based on simulations with electric–thermal analogy, is given. The results of these analyses can be applied to enhance the dynamic response of temperature measurement made by temperature probes in water. 相似文献
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Isaac GH Thompson J Williams S Fisher J 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2006,220(2):119-133
When first introduced, total hip replacements offered pain relief and improved mobility in elderly patients. The success of this procedure in terms of long-term durability and restoration of function has led to its use in younger, more active patients. This has resulted in a commensurate increase in patient expectation regarding longevity and the degree to which function and lifestyle is restored. The bearing surface is a key feature of the performance of replacement joints. It is generally accepted that excessive amounts of wear debris preclude their long-term survivorship and hence there is an ongoing requirement for bearing surfaces which minimize debris generation. The purpose of this paper is to review the factors which affect the performance of so-called metal-on-metal bearings, to compare their performance with that of the other commonly used contemporary alternatives, metal and ceramic articulating against highly cross-linked polyethylene, and ceramic-on-ceramic, and finally to consider the potential solutions offered by new developments such as ceramic-on-metal and coatings applied to metal-on-metal bearings. 相似文献