GB1321759A - Stopper mountings for bottom-pouring metallurgical vessel - Google Patents

Abstract

1321759 Operating ladle stopper rods SULZER BROS Ltd 29 Nov 1971 [4 Dec 1970] 55343/71 Heading F4B A stopper rod 7 in a ladle 1 is actuated by a toggle linkage comprising an L-shaped operating lever 20, 21 pivoted at 13 on a pillar 16, and a connecting link 23 pivoted at 22 to the lever section 21 and at 30 to a swing link 14 which is itself pivoted to a sleeve 8 at 10 and to the pillar 16 at 12 the arrangement being such that the ratio between the distance moved by the stopper plug 6 and the pivot 30 increases as the plug rises. A further swing link 15 pivoted at 11 to the sleeve 8 and also at 13 to the pillar 16 carries a stop 31 which limits the movement of the connecting link 23 and thus the height to which the plug 6 rises. The sleeve 8 is movably attached to the stopper rod 7 by a screw 9 and the pillar 16 slides in a guide 17 attached to the ladle 1 and is fixed by one or more screws 18. The lever 20 is operated against a spring 18 which tends to restore it to a position in which the plug 6 is closed and the three pivots 22, 13 and 30 are aligned. Fig. 4 is a diagrammatic view showing the movement of the pivots 10, 11 of the two swing links 14, 15 for a movement of the plug 6 over the vertical distance h. The operative radius of the top swing link 14 is denoted by r, whereas b denotes the vertical distance between the two swing links, c denotes the vertical distance between the link 15 and the bottom edge of the plug 6 and d=c+b denotes vertical distance of the top link 14 from the plug bottom edge. A simplified formula connecting these distances is The invention may also be applied to tundishes and melting furnaces.