Selection, use and normal maintenance of mine drilling tools
Published:
2020-11-12
According to the nature of the rock, choose a suitable cemented carbide mine drill bit. Generally speaking, for rock with high hardness, use drill bits with relatively low hardness alloys, and vice versa, use alloy drill bits with relatively high hardness. For extremely hard rocks, if the power of the rock drill is high, you can choose a three-blade or cross bit. At this time, in order to facilitate the unloading, the taper hole of the bit can be 11° or 12°. For the rock with medium hardness and good integrity, in order to improve the work efficiency and reduce the cost, a button bit can be used.
One, choose
1. Selection of mine drill bits
According to the nature of the rock, choose a suitable cemented carbide mine drill bit. Generally speaking, for rock with high hardness, use drill bits with relatively low hardness alloys, and vice versa, use alloy drill bits with relatively high hardness. For extremely hard rocks, if the power of the rock drill is high, you can choose a three-blade or cross bit. At this time, in order to facilitate the unloading, the taper hole of the bit can be 11° or 12°. For the rock with medium hardness and good integrity, in order to improve the work efficiency and reduce the cost, a button bit can be used.
2. The choice of drill rod
The drill rod should ensure that there is only enough mating surface with the drill bit. Generally, the depth of the drill rod inserted into the drill bit should be ≥25mm, and the contact surface should be as large as possible, and the minimum should not be less than 60%. Therefore, try to choose drill rods that are machined with taper tips. The drill rod used in conjunction with the drill bit should ensure that it is straight by naked eyes, and the impact end of the drill tail should be flat.
Whether it is a drill bit or a drill rod, the water hole should be kept unblocked.
Two, use
When the drill bit and the drill rod are in use, first check whether the drill tail is flat, whether the taper tip and the taper hole meet the requirements, whether the cutting edge of the drill bit is damaged, whether the water hole is unblocked, and whether the wind pressure and water pressure are sufficient It is strictly forbidden to collide between the alloys of the drill bits. When you start drilling, you should pay attention to the light wind, that is, the wind pressure should be lowered first, and the wind pressure can be gradually adjusted to normal after the drilling is stable. When withdrawing the drill, the drill should be turned back as much as possible, and try to avoid forcibly knocking and pulling, so as not to damage the drill bit or the drill rod and cause early scrapping.
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