Factors affecting the efficiency of rock drilling tools
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The efficiency of rock drilling tools is not only related to the correct choice of cemented carbide grades, but also affected by many factors, such as the shape of the drill bit, rock hardness, compressed air pressure, powder discharge method, hole diameter and hole depth.
The shape of the drill bit directly affects the cross-section of the hole, and most of the holes are polygonal rather than circular. Therefore, the polygonal cross-section is formed because the drill bit rotates along its own axis, which is inclined to the injection restriction side.
Compressed air pressure has a great influence on the drilling speed of the drilling tool. As the compressed air pressure decreases, the relative supply rate of the rock drill decreases.
In the process of percussion drilling, the accumulation of rock dust in the hole will greatly reduce the supply speed of the rock drill, especially when drilling vertically or diagonally. If the accumulated rock dust is not removed in time, it will increase repeated crushing and reduce the drilling speed. There are two main methods to remove the rock dust from the blast hole: blowing and washing.
Increasing the hole diameter of the drill will reduce the drilling speed per unit time. By reducing the diameter, the drilling speed can be increased. As the hole diameter increases, a large-diameter charge is required. As the diameter of the charge increases, the blast hole can be increased. With a high utilization rate, the explosive can be completely detonated, reducing the content of toxic nitric oxide in the blasting product.
Small-caliber drills have been popularized in some mine tests for a period of time and have achieved certain results, but they have not been fully promoted and used.
Rock drilling tool manufacturers remind you that the drilling depth has a great influence on the driving speed and operation cycle time. As the drilling depth increases, the drilling speed decreases. When the borehole reaches a certain depth, due to the elastic deformation of the drill pipe and the increase in the friction of the hole wall, the impact energy loss of the drill pipe also increases. The change of the drilling depth leads to the change of the drilling speed. In, they are different, in hard rock, it hardly works.
