Summary of Detailed Steps for Knowledge Popularization

Original Title: Summary of Detailed Steps for Knowledge Popularization and Daily Preservation of Down-the-Hole Drilling Tools Size selection of down-the-hole impactor, drill bit and drill pipe The size of the down-the-hole impactor depends mainly on the hole diameter and the rock type. For blasting holes, the hole diameter range of down-the-hole drilling is from 89mm to 252mm, the hole diameter less than 89mm is mainly the top hammer type, and the multi-purpose rotary drilling mode with a hole diameter greater than 252mm is mainly selected. Generally speaking, the smallest hole size that a down-the-hole impactor can fit is its nominal size, which means that the smallest hole size that a 4-inch impactor can fit is the 4-inch hole size. Generally speaking, in this case, there is enough annular space between the impactor and the hole wall, and between the drill pipe and the hole wall for slag discharge. The maximum size of the matching bit is the size of the impactor plus 1 inch. For example, the maximum bit size to match a 4-inch impactor is 5 inches. The outer diameter of the drill pipe and the outer diameter of the impactor are as close as possible, which can ensure better slag discharge and reduce the possibility of sticking. In terms of the processing technology of drill pipe, the surface finish and dimensional accuracy of cold-drawn pipe are superior to those of hot-rolled pipe. Good surface finish means that the surfhe total perforation speed are improved. Select the appropriate down-the-hole bit Looking at the drill bit, the main body of the drill bit is usually machined from cemented carbide, then heat treated to the specified hardness, so that the surface compressive stress has enough fatigue resistance, and then embor. An experienced driller can effectively adjust the drilling parameters to reduce the probability of impactor failure and improve the life of the impactor. There are a variety of impactor options on the market, both inexpensive and high-end. However, the value of impactor is not only measured by its material and design itself, mining dth bit , but also by the balance between the efficiency brought to users and the so as to help you save more money. Machines are more reliable than people. If you are good to machines, machines will be good to you. Reprinted from the network,dth rock bit, the copyright belongs to the original author, if there is infringement, please contact to delete! You see this article with · Return to Sohu to see more Responsible Editor:. wt-dthtools.com than before,