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讨论了实现齿轮箱磨屑在线监测传感器的几种技术途径,比较分析了在线磁性探测、在线感应探测方法的原理及适应性,提出实现矿用齿轮箱磨屑在线监测传感器的合理技术途径为:用磁性技术同时实现金属磨屑的重复聚集和测量。该途径降低了对传感器的测量精度要求。 相似文献
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矿用气体传感器的可靠性和灵敏度直接关系到煤矿安全系统的安全程度,精准测量和性能稳定的数据来源是煤矿安全监控系统正常运行的重要环节。针对我国生产企业气体传感器测试存在的人工耗时长、工作效率相对较低以及有毒有害气体不环保排放等诸多问题,研究了2套智能化测试装置。该装置采用煤矿安全监控系统植入机械臂ROS主机技术和监测废气系统Keil软件,设计滑环取电技术和充气单元相互配合进行测试,智能化提升测试手段,实现矿用气体传感器安全高效的检定出厂。 相似文献
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地下开采中瓦斯抽采的针对性与有效性是煤与瓦斯共采的关键问题,其核心是在理论和技术上对采动引起的裂隙网络所形成的增透性进行定义和分析。在综合考虑煤体在不同开采方式形成的支承压力、孔隙压力和瓦斯吸附膨胀耦合作用对损伤裂隙煤体体积改变的影响的基础上,定义了一个新力学量--增透率,来反映单位体积改变下煤体渗透率的变化,推导了4种增透率的理论表达式,并对工程实例进行数值分析,定量描述了开采过程中覆岩和煤层中增透率的分布和演化,结果表明增透率能够反映开采扰动对煤岩体裂隙网络渗透性的影响,为煤与瓦斯共采工程中的煤层增透效果评价提供定量指标和科学方法。 相似文献
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为了探明二道岭矿区煤层瓦斯赋存规律,通过实测煤层瓦斯含量,以瓦斯地质理论为基础,分析了二道岭矿区煤层瓦斯赋存的控制因素。结果表明:岩浆热变质是矿区瓦斯含量普遍较大的根本原因;矿区构造和煤层埋深是控制瓦斯分布状况的直接因素。 相似文献
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An active measurement method and its principle was introduced considering the low success rate, special difficulty, and long
measurement time of the direct gas pressure measurement currently used in coal roadways. The technology of drilling, borehole
sealing depth, borehole sealing length, sealing control of the measuring process, compensatory computation of gas loss quantity
and other key techniques were discussed. Finally, based on the latest instrument the authors developed, a series of experiments
of direct gas pressure measurement in the coal roadways of the Jincheng and Tongchuan mine district, were carried out. The
experimental results show that active gas pressure measurement technique has advantages as follows: (1) the application scope
of direct gas pressure measurement technique is wide and it does not have the restriction of coal hardness, coal seam fissure
and other conditions; (2) the measured results are credible, which can be tested by the same gas pressure value acquired from
a different borehole in the same place; (3) the measurement process is convenient and quick, it takes about 2 to 3 days to
acquire the gas pressure value in a coal seam.
Supported by National Basic Research Program of China (2005cb221504); National Key Technologies R & D Program of China (2006BAK03B01) 相似文献
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瓦斯抽采钻孔围岩的破坏形态和范围对于瓦斯通道区域的联通具有重要影响。以钻孔围岩“蝶形塑性区”理论模型为基础,对深部煤与瓦斯共采中钻孔瓦斯导向通道进行了研究,结果表明:深部环境和采矿活动引起的“加载”与“卸荷”效应,会使钻孔围岩出现有利于瓦斯导通的“蝶形塑性区”,蝶叶长度可达钻孔直径的几十倍以上。以“蝶形塑性区”理论为基础,提出了优质瓦斯通道的概念:通过协调采矿工程活动与瓦斯抽采钻孔布局,形成有利于瓦斯抽采的瓦斯导通和流动网络;并确定了以构建优质瓦斯通道的应力环境,确定钻孔布置岩层层位及协调采矿活动与钻孔时空关系为主要内容的优质瓦斯通道构建方法,以实现优质瓦斯通道的高效性、稳定性、长期性,提高瓦斯抽采效率。 相似文献
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为查明滑动构造下马岭山矿区煤层突出的特点和控制突出发生的因素,采用瓦斯地质分析和实验室参数测定相结合的方法,通过与其他矿井煤层参数的对比,研究滑动构造对马岭山矿区发生煤与瓦斯突出的影响因素。结果表明,受滑动构造的控制,马岭山矿区瓦斯赋存特征为:在瓦斯风化带下限周围,煤层瓦斯含量梯度较未受滑动影响煤层增大5.1倍。矿区煤体强度极低,多数煤的坚固性系数小于0.3,煤的孔隙率与未受滑动构造影响煤层相比下降了60%。控制突出发生的主要因素为煤层厚度,矿区内突出均发生在煤厚大于3 m的区域。这些特点使矿区内矿井往往从低瓦斯矿井直接升级为煤与瓦斯突出矿井。 相似文献
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Jiuchuan Wei Fuzhu Wu Huiyong Yin Jianbin Guo Daolei Xie Lele Xiao Hongfeng Zhi Liliana Lefticariu 《Mine Water and the Environment》2017,36(1):59-66
Formation of a zone of interconnected fractures during coal mining is a key factor in mine flooding. Coal mines in western China are characterized by thick coal seams with mechanically weak overburden. In situ studies including drill core analysis, drilling fluid loss measurement, and borehole video monitoring were used at the working face 101 in Shaanxi Jinjitan coal mine to explore the maximum height of the interconnected fractures zone (IFZ). Also, tests on a scaled physical model and numerical simulation based on the drilling data were used to study the formation of the fractured zone. By considering data from other mines with similar mining conditions, a logarithmic relationship was found between the maximum height of the IFZ and the thickness of coal excavation. The maximum height of the IFZ was found to be 27 times the thickness of the excavated coal seam, which is far more than in coal mining areas in eastern China. Also, the IFZ in overlying strata of the study area was arch-shaped, not saddle-shaped, as had been observed in previous studies. 相似文献