EXTENSION-TYPE CUTTER DRUM FOR DRILLING MACHINE Russian patent published in 2011 - IPC E21C27/24 E21C25/06 

FIELD: mining.

SUBSTANCE: tunnelling machine includes movable frame having the front end section, multiple rotor assemblies containing many working members with rotor cutter, which are located at some distance from each other in the front end section of movable frame, assembly of cutter drum, which is located in the front of the front end section and contains rotation axis located across the section of the front end of movable frame, section of the first end drum, section of the second end drum and section of middle drum. Section of the first end drum includes the following: the first shaft passing along rotation axis and including the first channel passing along rotation axis; the first end drum attached to the first shaft; extension piece of the first end drum, which is located coaxially around rotation axis; the first piston located in the first channel with possibility of rotation relative to it, which is fixed relative to extension piece of the first end drum and offset along rotation axis between extended configuration of extension piece of the first end drum and retracted configuration of extension piece of the first end drum; the first coupling sleeve transmitting the torque moment between the first end drum and extension piece of the first end drum. Section of the second end drum includes the following: the second shaft passing along rotation axis and located at some distance along rotation axis from the first shaft and including the second channel passing along rotation axis; the second end drum attached to the second shaft; extension piece of the second end drum, which is located coaxially around rotation axis; the second piston located in the second channel with possibility of being rotated relative to it, fixed relative to extension piece of the second end drum and offset along the rotation axis between extended configuration of extension piece of the second end drum and retracted configuration of extension piece of the second end drum; the second connecting sleeve transmitting the torque moment between the second end drum and extension piece of the second end drum. Section of middle drum is located concentrically to rotation axis and passes between the first and the second shafts.

EFFECT: development of extension piece of drum of lower layout of cutter drum, which is supported irrespective of the main drum for relative extension and retraction.

22 cl, 63 dwg