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道轨螺栓孔的加工在矿井地面和井下条件下进行。手动的CC-24型穿孔机由于其本身有一系列的缺点(钻头寿命短,井下没有打磨装置等)而在井下很少使用。为了提高穿孔工序的机械化水平,必须研制高效的液压穿孔装置。研究和分析表明,根据道轨硬度等级(H级或T级)的不同,穿出直径为25.5mm的P24和P33型道轨螺栓孔所需的应力为500～800kN。乌克兰水力采煤科学研究所根据已获得的资料设计、制造和试验了P24和P33型道轨螺栓孔加工装置(ПП型)。这种装置(见图1)本身包括液压式加压机1、带
Rail bolt hole processing in the mine floor and underground conditions. The manual CC-24 punch is rarely used downhole because of its own set of shortcomings (short bit life, no downhole grinding equipment, etc.). In order to improve the mechanization level of the punching process, it is necessary to develop an efficient hydraulic punching device. Research and analysis have shown that the stress required to pierce the bolt holes P24 and P33 of 25.5 mm in diameter is 500 to 800 kN, depending on the grade of the rail gauge (class H or class T). Ukraine Hydraulic Coal Research Institute based on the information obtained has been designed, manufactured and tested P24 and P33 rail bolt hole processing device (ПП 型). This device (see Fig. 1) itself comprises a hydraulic press 1, belt