FIELD: mining.
SUBSTANCE: device includes pipe, spacing ring with slot edged in outside circumferential direction and sealer installed on pipe end in series. End of pipe is provided with cone expansion. In the pipe there are forcer and sleeve installed connected to the pipe by threaded connection. Between forcer and sleeve a spring is located. The sleeve is provided with bar to rotate.
EFFECT: increasing operating efficiency.
4 cl, 3 dwg
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