The drill bit of the
roof bolt machine is the main component of the drilling machine. It is a tool for transmitting impact energy, directly contacting the rock and blasting. During the whole operation process, the bit of the roof bolt machine is subjected to very complicated forces. Therefore, the material and shape of the bit are very high. When using the eccentric drill bit, you must grasp the technical essentials. The drilling parameters selected should be based on the principle of low speed, low feed pressure, and high upper return air speed. , Water content and other factors control the drilling speed. When the drilling encounters particularly loose or large fissure formations, the feed speed and pressure should be reduced, and the slag discharge and hole cleaning should be repeated.
The DTH hammer and pipe drilling technology of the
roof bolter is an effective method for overcoming the difficulty of drilling in complex formations during engineering construction. The eccentric pipe drilling tool is a complex formation due to its unique structure and excellent working performance The drilling construction provided a reliable technical guarantee. The specification series of follow-up drilling tools used in engineering construction has also been increasingly perfected, and has developed from a small aperture to a large aperture.
When the
roof bolter drilling is completed or the center drilling tool needs to be replaced, the hole should be cleared first, the residue at the bottom of the hole is blown out, and then the rotation is stopped. The dynamic center drilling tool is suitable, and the height is raised until the back of the eccentric drill bit contacts the front end of the casing shoe; then reverse the drilling tool at a low speed while slowly lifting the center drilling tool upwards. When it is observed that the center drilling tool can be lifted smoothly, it indicates that the eccentric drill bit has been gathered. At this time, the center drilling tool can be lifted according to the conventional method until all the center drilling tools are raised. When reversing the drill, care should be taken to prevent the drill from tripping.
