What is the structure of the coal roadway drilling rig and where is it mainly suitable for use?

In the drilling method, except exploration drilling, coreless drilling is usually used, and the drilling structure is simple. Rotary drilling is a widely used method. Pneumatic percussion drilling is only used for coreless drilling in hard rock, and it is required to be used when drilling speed is high. Cemented carbide drilling is widely used because most of the coal-bearing rocks are soft and medium hard rocks. Diamond drilling is often used when coring drilling or rope coring drilling is carried out in hard rocks. In recent years, composite drills have also been applied in coal mines, and some mines also use toothed wheel drills for large-diameter coreless drilling in hard rocks. In addition to the application of mature technology in ground drilling, Shandong China Coal Company has also developed horizontal drilling and coal seam drilling in tunnel drilling.

Both horizontal drilling and coal seam drilling belong to controlled directional drilling, but horizontal drilling should keep the drilling trajectory approximately horizontal, which can pass through both coal seam and surrounding rock, and coal seam drilling should extend the drilling depth in the coal seam, so the drilling trajectory should be bent ali 1 1 according to the fluctuation of coal seam. With the popularization of comprehensive mechanized coal mining technology, it is required to continuously improve the detection accuracy of geological structures; In order to carry out gas drainage more effectively, it is developed with the emergence of technical requirements such as drilling deep holes along coal seam.