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测定ΔP 值时,煤样必须拿到井上,而且只能在井上实验室进行,这是一大缺点。因为单单是测定就要花4个小时左右,而从取样到测出结果,至少需花费6～8小时。而在这段时间内,巷道内可能又爆破了二次,即掘进面又推进了5～6米,如使用巷道掘进机掘凿的话,则可能已完成了开拓任务。最好能找出一个快速测定方法,既能在井下应用,又可在短时间内,提供一个令人信服的数据,证实哪一区段的煤有突出危险。目前(西德)矿井通风研究所与采矿研究股份有限公司的测量,调节技术部合作,已研制出符合上述设想的新型测定仪。
The determination of the ΔP value, the coal sample must be obtained uphole, but only in the uphole laboratory, which is a major drawback. Because the measurement alone takes about 4 hours, and from the sample to the measured results, it takes at least 6 to 8 hours. During this period of time, the tunnel may be demolished twice, that is, the driving surface has been advanced by 5 to 6 meters. If the roadheader is used for excavation, it may have already completed the task of exploration. It is best to find a quick test that provides both a downhole application and a convincing piece of data in a short period of time that confirms which section of coal is in serious danger. The current (West Germany) Mine Ventilation Research Institute and Mining Research Co., Ltd. Measurement, Regulation Technology Department, has developed in line with the assumption of a new type of detector.