Instructions for use of down-the-hole（DTH） bits

 

In order to use the down-the-hole (DTH) drill bit correctly, to ensure the rock drilling speed and service life of the bit, the following points must be paid attention to:

  1. Choose DTH drill bits according to rock conditions (hardness, abrasiveness) and drill bit type (high wind pressure, low wind pressure). Different forms of alloy teeth and tooth arrangement methods are suitable for different rock drilling. Choosing the right down-the-hole drill bit is the premise for the best use effect;
  2. When installing the down-the-hole drill, place the drill bit gently into the drill sleeve of the DTH impactor, and don’t hit it hard to avoid damaging the tail shank of the drill bit or the drill sleeve;
  3. In the process of rock drilling, it is necessary to ensure that the air pressure of the down-the-hole drilling rig is sufficient. If the impactor works intermittently, or the blast hole powder is not discharged smoothly, check the compressed air system of the down-the-hole drill to ensure that there is no slag in the hole during the drilling process;
  4. If metal falls into the hole, it should be sucked out with a magnet or taken out by other methods in time to avoid damage on the drill bit;
  5. Pay attention to the size of the drilled blast hole when replacing the drill bit. If the diameter of the drill bit is excessively worn, but the blast hole has not been drilled well, do not update the drill bit to avoid sucking. Used old drill bits with roughly the same wear diameter can be used to complete the work;
  6. For down-the-hole drill bits that have been abnormally scrapped in the early stage, pls notify our company in time. The notification content mainly includes:

1) Type of rock and construction site;

2) Model of impactor used as a set;

3) Drilling failure modes (breaking of teeth, tooth loss, chipping of the head of the drill, fracture of the shank of the drill, etc.);

4) The service life of the drill bit (drilling footage);

5) Number of failed drill bits;

6) The drill bit’s footage in meters during normal use.