1. Choice 1. Selection of mine drill head According to […]
1. Selection of mine drill head
According to the nature of the rock, choose a suitable carbide bit. Generally speaking, the rock with high hardness selects the bit supplied by the alloy with relatively lower hardness, while the alloy bit with relatively higher hardness is selected. For extremely hard rock, if the power of the rock drill is large, a three-edged or cross bit can be used. At this time, in order to facilitate unloading, the cone hole of the bit can be 11 ° or 12 °. For medium-hardness and better-integrity rocks, in order to improve work efficiency and reduce costs, ball-tooth bits can be used.
2. Choice of drill rod
The drill rod should ensure that there is only enough matching surface with the drill head. In general, the depth of the drill rod inserted into the drill head should be ≥25mm, the larger the contact surface, the better, and the minimum should not be less than 60%. Therefore, try to choose the drill rod with the taper tip machined. The drill rod used in conjunction with the drill head should be straight to the naked eye, and the impact end surface of the drill tail should be flat.
Whether it is a drill head or a drill rod, the water hole should be kept smooth.
When using the drill head and the drill rod, first check whether the drill tail of the drill rod is flat, whether the taper and taper hole fit the requirements, whether the cutting edge of the drill head is damaged, whether the water hole is smooth, and whether the wind pressure and water pressure are sufficient Wait, the collision of alloys between the drill heads is strictly prohibited. At the beginning of eye drilling, it should be noted that the light wind must be lightly tapped, that is, the wind pressure should be drilled first, and the wind pressure can be gradually adjusted to normal after the drilling is stable. When retreating, you should try to return to retreat as much as possible, and avoid forcibly knocking and dragging as much as possible, so as not to damage the drill head or drill rod, causing early scrap.