FIELD: equipment for maintaining aluminum cells. SUBSTANCE: unit for sealing punch in systems for automatically supplying loose raw material to aluminum cells includes pneumatic drive with rod joined with punch; self-aligning joint assembly of rod whose body is secured by its outer surface to gas accumulating bell of cell. Yokes and sealing ring are mounted in body. Inner surface of ring is placed with gap providing reciprocation motion of rod. Outer surface of ring and reciprocal to it surfaces of yokes are spherical ones. Yokes are mounted in body through members of electrically insulated material. Unit provides fluid-tightness and electrical insulation of system in range of working temperature values. EFFECT: enhanced operational reliability of punch. 3 cl, 1 dwg
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