Robot arm extension device and robot including same

A robot comprising:

• a main body;
• a robot arm connected to the main body and configured to perform rotational motion or translational motion;
• a housing connected to an end of the robot arm through an adapter;
• a length extension part embedded in the housing and configured to be pulled out of or pulled into the housing;
• and
• a driving part configured to provide a driving force to the length extension part,
• wherein the length extension part includes a first row chain block and second row chain block,
• wherein the first row chain block includes a plurality of first chain blocks and the second row chain block includes a plurality of second chain blocks, and wherein the plurality of first chain blocks are rotatably coupled with each other and the plurality of second chain blocks are rotatably coupled with each other,
• wherein the first and second chain blocks are aligned in a straight line so that the first and the second chain blocks are pulled out of the housing,
• wherein the first and second chain blocks are each oppositely wound so that the first and the second chain blocks are pulled into the housing,
• wherein the plurality of first chain blocks includes a first magnetic material and the plurality of second chain blocks includes a second magnet material,
• wherein each of the respective first and second chain blocks includes:
• a base in the shape of a square plate;
• and
• a protrusion formed to protrude from a first surface of the base at a first edge and a second edge facing the first edge,
• wherein a third edge of the base is rotatably connected to a fourth edge of an adjacent chain block while the protrusions are being aligned in the first direction, and
• wherein, when the protrusion of the first row chain block is directly coupled to the protrusion of the second row chain block via the first and second magnetic materials, the length extension part is pulled out of the housing.