Portable seafloor drill rig for submersible for multi-point core drilling

A portable seafloor drill rig for a submersible for multi-point core drilling, comprising:

• a power head,
• a reduction gear box,
• an emergency jettison device,
• a drilling tool, and
• a temperature and pressure-retaining device;
• wherein a water supply connector and the power head are arrange on a top plate of the reduction gear box;
• an output shaft of the power head is connected to an input shaft of the reduction gear box;
• an output shaft of the reduction gear box is provided with a central hole, and the central hole is in communication with a water inlet hole of the water supply connector;
• the emergency jettison device comprises:
• a shell;
• a fixing ring;
• a main spindle;
• a jettisonable shaft piston;
• and
• a steel ball ferrule;
• wherein the shell is arranged on the reduction gear box;
• the main spindle, having a tubular structure, is arranged in the shell via a bearing;
• a lower end of the output shaft of the reduction gear box is connected to an upper end of an inner hole of the main spindle via a key;
• a lower end of the inner hole of the main spindle is connected to an upper end of a jettisonable connecting shaft of the drilling tool via a key;
• a lower end of the main spindle is provided with a plurality of steel ball holes located in the same horizontal plane;
• each of the steel ball holes is provided with a steel ball;
• the steel ball ferrule and the fixing ring are sleeved outside the main spindle;
• the steel ball ferrule is set corresponding to the steel ball hole;
• a lower part of an inner hole of the steel ball ferrule is wedge-shaped, so as to squeeze the steel balls toward a center of the main spindle;
• the fixing ring is arranged above the steel ball ferrule;
• the jettisonable connecting shaft is provided with a boss corresponding to the plurality of steel ball holes;
• an upper end and a lower end of the boss are spherical, and a middle part of the boss is cylindrical;
• the plurality of steel balls support the boss of the jettisonable connecting shaft;
• the jettisonable shaft piston is sleeved outside the steel ball ferrule and the fixing ring;
• an inner hole of the jettisonable shaft piston is provided with two stepped surfaces;
• an upper end of the steel ball ferrule and an upper end of the fixing ring are respectively provided with a washer;
• the washers of the steel ball ferrule and the fixing ring respectively support the two stepped surfaces of the inner hole of the jettisonable shaft piston;
• a retaining ring is arranged in the inner hole of the jettisonable shaft piston, and located at the upper end of the fixing ring;
• an upper-middle part of an outer ring of the jettisonable shaft piston is matched with an inner hole of the shell;
• a diameter of both ends of the outer ring of the jettisonable shaft piston is smaller than that of a middle part of the outer ring of the jettisonable shaft piston;
• two ends of the outer ring of the jettisonable shaft piston and the inner hole of the shell respectively enclose two oil cavities, and each of the two oil cavities is respectively in communication with two oil inlets on the shell;
• and
• the temperature and pressure-retaining device is configured to retain a temperature and a pressure of a rock core drilled by the drilling tool.