2 results about "Sea bottom" patented technology

The invention relates to deep-sea mining operation equipment, and specifically relates to a submarine mining vehicle walking chassis and self-rescue method thereof. one ends of front and rear telescoping racks are respectively in telescoping connection with the front and rear sides of a body; push-and-pull oil cylinders are installed on the front and rear sides of the body; piston rods of the twopush-and-pull oil cylinders are connected to the front and rear telescoping racks; the front and rear telescoping racks can stretch out and draw back through the driving of the push-and-pull oil cylinders; the other ends of the front and rear telescoping racks are connected to stepping oil cylinders; piston rods of the stepping oil cylinders are connected to supporting sliding shoes which can accomplish the support stepping when the slipping or difficult travelling of a track system occurs; and the elevating of the supporting sliding shoes can be realized through the driving of the stepping oil cylinders. Through the combination of track travelling and support stepping, the walking chassis can adapt various complex terrains on the deep seabed, perform timely self-rescue when the slipping or difficult travelling of tracks occurs, and successfully accomplish deep seabed mining missions.

The invention is directed to a tensioner assembly for providing tensile force from a floating vessel at the surface of the ocean to the blowout preventer stack, or production tree, which is connected to the wellhead at the sea floor. The tensioner assembly compensates for vessel motion induced by wave action and heave and maintains a variable tension to the riser string alleviating the potential for compression and thus buckling or failure of the riser string. The tensioner assembly of the present invention includes a cylinder, a stop tube disposed with the cylinder, and a ram slidably engaged within the stop tube. The tensioner assembly also includes at least one gas, or air, transfer tube to create a pressurized air over hydraulic fluid arrangement to provide tensile force to the tensioner assembly.