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1.Downhole drilling machine: When drilling a downhole gun hole with a aperture less than 150 mm, in addition to the application of a rock drill, it can also be used to drill a small diameter of 80 ~ 150 mm. When drilling a gun hole with a diameter of less than 70 mm in coal or softer mineral rock, it is generally used to drill or air drill, driven by a motor (or air motor) to drill the drill pipe, and the rock (coal) chips drilled out are discharged through the spiral groove on the drill pipe.

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DTH drilling refers to a method where the drilling bit is located at the end of a drill string, below the surface of the ground. This technique is distinguished by the use of high-performance percussion hammers, which are positioned on the drill bit. DTH drilling involves the use of compressed air to deliver rapid impacts, breaking rock into smaller fragments. This method is particularly effective in hard rock formations, making it a preferred choice for mining operations and various drilling applications.


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  • The primary function of manhole covers is to provide access to underground utilities, including sewers, water lines, and electrical systems. However, an open manhole poses significant safety risks. Pedestrians, especially children, can accidentally fall into open manholes, leading to serious injuries or fatalities. In this context, locked manhole covers act as an additional safety measure, preventing unauthorized access and reducing the likelihood of accidents.


  • Our houses, workplaces, and public areas are all powered by electrical equipment and cables that are buried below the surface. Manhole covers protect the security and safety of these electrical components. They reduce the possibility of electrical shocks or other damage by preventing contact with live wires. In short, manhole covers protect both workers and the general public from potential electrical hazards.