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国外某些公司应用БКР型钎头和类似该型号钎头的经验表明,在很多情况下,特别是钻凿可塑性岩石时,炮孔内凿岩面中心部位破碎是由于岩芯被压碎和磨蚀所致。这将导致能耗的增高,结果还会降低凿岩的速度。此外,还因炮孔内凿岩面中心部位的负荷不断增大,必将引起硬质合金片的过度磨损和脱落。 根据试验研究的结果,选定了用中部无超前刃的钎头破碎工作面的技术方案(见图),从而能保证降低凿岩能耗。采用这种方案时,炮孔内凿岩面的环形区用楔形刃身凿碎,而凿岩面中心形成的岩芯系在剪应力作用下呈块状破碎。
Some foreign companies using БКР bit and similar drill bit experience shows that in many cases, especially when drilling plasticity rock, the center of the blast hole rock face is broken due to crushing and erosion of the core Due. This will lead to increased energy consumption, the result will reduce the speed of rock drilling. In addition, due to the increase of the load at the center of the rock face in the blasting hole, excessive wear and tear of the cemented carbide sheet will be caused. According to the results of the experimental study, the technical scheme of crushing a working face with a drill head without a leading edge in the middle is selected (see the figure), so as to reduce the energy consumption of rock drilling. In this scheme, the annular area of the rock face in the blast hole is chipped by a wedge-shaped blade, while the core formed at the center of the rock face is broken by the shearing force.