SYSTEM FOR REPLACEMENT OF EARTH DRILL CUTTING MEMBER IN FIELD CONDITIONS Russian patent published in 1998 - IPC

FIELD: drilling machinery and equipment. SUBSTANCE: system for replacement of cutting member of earth drill in which cutting member is made up of several segments incorporates tubular component which is adapted for possible connection with lower end of drill. Tubular component is provided with installing facility made over periphery along inner wall of tubular component. Mounted on tubular component are aforesaid segments which in cutting position can be kept in contact with earth. Also provided is cylindrical insert. Cutting member is made up of several individually installed segments. Insert is secured on tubular component with possibility for movement within its limits between mounting position in which insert locates segments in installing facility and holds them in cutting position between insert and tubular component, and return position in which insert is withdrawn, thus releasing segments from position between insert and tubular component for possible removing and replacement of segments. In combination system, drilling head and reaming drill have number of segments and also first subsystem for replacement of drilling head segments, and second subsystem for replacement of reaming drill segments. Each subsystem incorporates tubular component adapted for possible connection with lower end of drill and having installing facility created over periphery along inner wall of tubular component for mounting segments on it in cutting position for possible contact with earth, and insert which is secured on tubular component for possible movement within its limits between mounting position in which insert locates segments in installing facility, and holds them in cutting position between insert and tubular component, and return position in which insert is withdrawn, thus releasing segments from position between insert and tubular component for possibility of removing and replacement of segments. Tubular component of first subsystem is connected to tubular component of second subsystem. Drilling head and reaming drill can be replaced simultaneously. EFFECT: higher efficiency. 25 cl, 16 dwg