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英国采用了一项新技术,利用某些岩石和页岩的自然伽马射线来测定煤厚从而控制采煤机的采高。 自然伽马煤厚传感器由英国煤管局设计并很快用于美国的一个大型露天开采工程。该传感器直接固定在采煤机上,并配接应用微处理机的显示装置。传感器可以装配在几种主要类型的采煤机上,用以监测20英寸厚的煤层。从煤层上方或下方岩石中发出的伽马射线强度一般为20微微居/克(30千至2兆电子伏特能级上)。当使用该传感器时,采煤机的速度为19英尺/分。传感器的信号转换成煤厚信息,并由一竖排发光二极管向采煤机司机清楚地显示出留在顶、底板上的预定煤层厚度,偏离标定厚度的误差约为1英寸,这就能准确地控制采煤机的采高。
A new technology has been adopted in the UK to control the shearer height by measuring the thickness of coal using the natural gamma ray of some rocks and shale. The Gamma Thickness Sensor was designed by the UK’s Copper Authority and will soon be used in a large open-pit mining project in the United States. The sensor is fixed directly on the shearer and is equipped with a microprocessor-based display. The sensors can be mounted on several major types of shearers to monitor 20-inch-thick coal seams. Gamma rays emitted from rocks above and below the coal seam typically have a gamma ray intensity of 20 picoHertz (30 to 2 MEA). Shearer speed was 19 ft / min when using this sensor. The sensor’s signal is converted to coal thickness information and a vertical row of light-emitting diodes clearly shows to the shearer driver the thickness of the pre-determined seam remaining on the roof and floor, about 1 inch from the nominal thickness, which is accurate To control the shearer mining height.