скальные спиральные зубы бурора

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.

...

In the ever-evolving landscape of architecture and construction, the significance of roof covering cannot be overstated. Whether it's a residential abode, a commercial edifice, or a sprawling industrial facility, the roof serves as the first line of defense against the elements. It not only protects the structure but also enhances its aesthetic appeal. This is where the expert craftsmanship of a roof covering manufacturer comes into play.


...