Solid-bowl screw centrifuge with outlet openings for partial and residual emptying of the drum

A solid-bowl centrifuge comprising:

• a drum rotatable about a horizontal axis of rotation the drum having a drum lid at an end thereof;
• a screw arranged in the drum;
• a continuous solids discharge located at a first end of the drum;
• a continuous liquid discharge located at a second, opposite end of the drum;
• at least one discontinuously acting outlet opening including a closure device located on a radially outermost lateral surface of the drum lid;
• the closure device including a ring located on the radially outermost lateral surface of the drum lid and configured to be axially displaced along the radially outermost surface of the drum lid relative to the horizontal axis of rotation and rotatable with the drum during an operation of the centrifuge;
• an actuating device assigned to the closure device by which actuating device the ring is displaced into a first position which opens the at least one outlet opening and into a second position which closes the at least one outlet opening;
• and
• wherein the at least one outlet opening is formed in the drum lid.