Docking device comprising two coupling closures for the environmentally sealed transfer of bulk material, having at least one locking unit

A docking device for refilling, filling, and/or emptying of containers, comprising:

• first and second coupling latches that can be laid or which lie flush with each other along respective latch sides, wherein each of the first and second coupling latches includes a pipe nozzle;
• and
• at least one locking unit configured for reversible locking of said first and second coupling latches,
• wherein the first or second coupling latch has at least one centering pin, and the other of the second or first coupling latch has at least one centering opening that corresponds to the centering pin, which, when they grip each other, centers the first and second coupling latches in a coupled state,
• wherein the at least one locking unit is configured for locking together the pipe nozzles of the first and second coupling latches, the at least one locking unit comprising:
• at least one first movable arresting element that is present in a passage that has an opening towards an outer side of the centering pin, wherein the first arresting element is configured for locking interaction with the centering opening, and
• a bolt that is movable at least in sections in a cylinder present in the centering pin, wherein the bolt has a first section with a first diameter, a second section with a second diameter that is smaller than the diameter of the first section, and a third transfer section between the first and the second section with a tapering diameter,
• wherein the passage opens out to the outer side of the centering pin and into the cylinder and is of a length that is less than a diameter of the first arresting element, so that when a side surface of the first section of the bolt is in contact with the movable first arresting element, the first arresting element interacts with the centering opening and locks the first and second coupling latches together, and when the movable first arresting element is adjacent to a side surface of the second or third section of the bolt, the pipe nozzles of the first and second coupling latches are no longer lockable or are not locked to each other.