FIELD: mining.
SUBSTANCE: proposed device comprises pipe string for running, hollow hydraulic cylinders, circular pistons with hollow rods aligned in appropriate hydraulic cylinders to displace axially therein and mandrelling head for fitting of shutter. Hydraulic cylinders are connected from above with pipe string. Hollow rod is connected from below with mandrelling head. Every circular piston is composed by a sleeve with ring bulge with self-packing glands locked at this sleeve from top and bottom. Bulge outer surface is composed by ring belt. Rods of pistons are interconnected for limited radial and angular displacement.
EFFECT: higher reliability, longer life.
3 dwg
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