Zhongtian Drill Co., Ltd.

NEWS

Selection, use and normal maintenance of mine drilling tools

Release time:

2024-01-12

Selection of Mine Drill Head According to the nature of the rock, select the appropriate hard alloy mine drill bit. Generally speaking, the rock with high hardness selects the drill bit supplied by the alloy with relatively low hardness, and the alloy drill bit with relatively high hardness is selected. For extremely hard rocks, if the power of the rock drill is large, a three-blade or cross bit can be used. At this time, in order to facilitate the unloading of the drill, the taper hole of the drill bit can be used 11 ° or 12 °. For medium hardness rock with good integrity, in order to improve work efficiency and reduce costs, ball tooth bits can be selected.

Selection, use and normal maintenance of mine drilling tools

1. selection

1. Selection of mine drill bit

According to the nature of the rock, select the appropriate hard alloy mine drill bit. Generally speaking, the rock with high hardness selects the drill bit supplied by the alloy with relatively low hardness, and the alloy drill bit with relatively high hardness is selected. For extremely hard rocks, if the power of the rock drill is large, a three-blade or cross bit can be used. At this time, in order to facilitate the unloading of the drill, the taper hole of the drill bit can be used 11 ° or 12 °. For medium hardness rock with good integrity, in order to improve work efficiency and reduce costs, ball tooth bits can be selected.

2. Selection 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, as far as possible to choose the cone tip to mechanical cutting of the drill rod. The drill rod used in conjunction with the drill bit shall be flat and straight under visual observation, and the impact end face of the drill tail shall be flat.

Whether it is a drill bit or a drill rod, it should ensure that the water hole is unblocked.

2. use

When using the drill bit and the drill rod, first check whether the drill tail of the drill rod is flat, whether the fit between the cone tip and the cone hole meets the requirements, whether the cutting edge of the drill bit is damaged, whether the water hole is unblocked, whether the air pressure and water pressure are sufficient, etc. The drill bit is strictly prohibited from colliding with the alloy between the drill bits. At the beginning of drilling, attention should be paid to the slight wind, that is, the wind pressure should be slightly drilled first, and the wind pressure can be gradually adjusted to normal after the drilling is stable. When returning the drill rod, turn the drill rod back as much as possible, and avoid forcibly knocking and swaying as much as possible, so as to avoid damaging the drill bit or drill rod and causing early scrapping.