SEALING VALVE ARRANGEMENT FOR A SHAFT FURNACE CHARGING INSTALLATION

摘要

The invention relates to an upper or lower sealing valve arrangement for a shaft furnace charging installation. The arrangement comprises a shutter-actuating device (20; 120; 220; 320; 420) for moving a shutter (10) between a closed position in sealing contact with a valve seat (12) and an open position remote from the valve seat. The shutter-actuating device is of the dual-motion type, more specifically of the type configured to confer to the shutter a superposition of two rotations about substantially parallel axes (29; 39). It has a primary tilting arm (22) on a first tilting shaft (24) that defines the first axis (29) and is equipped with bearings (26) that support the primary tilting arm (22). A secondary tilting arm (32) carries the shutter (10) is connected to a second tilting shaft (34) that defines the second substantially parallel axis (39) and has bearings that support the secondary tilting arm (32) on the primary tilting arm (32). The shutter-actuating device has a mechanism (100; 200; 300; 400) configured to tilt the secondary tilting arm (32) when the primary tilting arm (22) is tilted. According to the invention, the first tilting shaft (24) is configured as hollow sleeve shaft and the shutter-actuating device (20; 120; 220; 320; 420) comprises a reference rod (42) extending through the first tilting shaft (24). This reference rod has a distal end portion to be connected to a stationary structure and a proximal end portion with a reference member (48; 248; 354; 454) that forms a kinematic reference frame for the driven side of the mechanism (100; 200; 300; 400).