PUMPING UNIT (VERSIONS) Russian patent published in 1998 - IPC

FIELD: oil recovery industry. SUBSTANCE: according to first version, pumping unit includes frame, strut with bearing platform on which walking beam with head is mounted by means of central bearing; besides that, crank mechanism with drive is mounted on this platform. Bearing platform is rotatably articulated on strut. Axis of hinge is parallel to axis of central bearing and is shifted horizontally relative to it towards crank mechanism. Turn of bearing platform for freeing the servicing zone is effected by means of autonomous drive specially provided for the purpose or by means of drive of crank mechanism. According to second version, pumping unit includes frame with strut mounted on it. Walking beam with head and crank mechanism is mounted on this strut by means of central bearing. Strut articulated on frame is provided with drive for its turn. Axis of hinge is parallel to axis of central bearing and is shifted horizontally relative to it towards crank mechanism. Servicing zone is freed by turning the strut with the aid of drive. EFFECT: enhanced reliability. 4 cl, 4 dwg