| 摘要 |
FIELD: bore-hole drilling machinery and equipment. SUBSTANCE: swivel has sectional body which is made up of lower and upper parts. Installed inside body on bearings is stem. Located in lower part of stem is sealing unit. Lower part of swivel body is sectional and it is made up of holder connected with upper part of body, and clamp located in holder on thread. Cylindrical slots are made in end face of stem and in end face of clamp. Concentric ring is seated in cylindrical slots with clearance. Concentric ring is made of non-metallic antifriction material. Aforesaid embodiment enhances reliability of swivel operation due to simplified mechanism for clamping sealing unit. Sealing unit is thus protected from abrasive particles contained in working fluid. EFFECT: higher efficiency. 1 dwg
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