Abstract: A poured molten metal quantity control device includes a fixed plate brick having at least one pouring port, a collector nozzle brick, a slide plate brick sandwiched therebetween, an outer race mounted so as to be turned on the outer peripheral side of the fixed plate brick by an extendable unit, and a frame having the slide plate brick mounted thereon that is mounted on the outer race through a pivotal hinge so as to be capable of opening and closing movements. The frame can be opened and closed through the pivotal hinge independently of the turning of the outer race with the extendable unit.

Abstract: A fixed plate (15) is provided in a fixed metal frame (14). An opening and closing metal frame (17) having a movable plate (21) is attached to the fixed metal frame (14) so as to be openable and closable. The fixed metal frame (14) is provided with a pressurizing mechanism (23) applying a pressure in a closing direction generated by a spring (25) to the opening and closing metal frame (17) in a closed state. An actuating member (29) is movably provided at a position facing the pressurizing mechanism (23). Cam surfaces (30d, 32a) are provided between the actuating member (29) and the pressurizing mechanism (23). The spring (25) is deformed against an urging force thereof on the basis of operations of the cam surfaces (30d, 32a) in accordance with a movement of the actuating member (29), and the pressure applied to the opening and closing metal frame (17) is strengthened.

Abstract: In a rotary nozzle brick body formed into a substantially egg-like shape in it's plan view, the present invention secures a contact area of a nozzle portion and improves a configuration factor which considerably affecting the durability of the body. A rotary nozzle brick body is characterized in that the external shape in plan view is comprised of first circular portions (G), second circular portions (H), third circular portions (K), and tangent lines connecting the first circular portions and third circular portions so that a substantially elliptical shape is formed by increasing the circular portion and shortening the tangent lines, instead of a substantially egg-like shape having long tangent lines.

Abstract: A poured molten metal quantity control device includes a fixed plate brick having at least one pouring port, a collector nozzle brick, a slide plate brick sandwiched therebetween, an outer race mounted so as to be turned on the outer peripheral side of the fixed plate brick by an extendable unit, and a frame having the slide plate brick mounted thereon that is mounted on the outer race through a pivotal hinge so as to be capable or open and close operation, wherein the frame can be opened and closed by the pivotal hinge irrespectively of a turning means composed of the extendable unit as well as the outer race is turned by a crank mechanism using triangle points consisting of a support pivot P1, a center of turn P3, and a pivot P2, and the positions of the triangle points are defined such that the completely open/close positions of the pouring port are matched to the end point and the start point of the stroke of the extendable unit.

Abstract: In a rotary nozzle brick body formed into a substantially egg-like shape in its plan view, the present invention secures a contact area of a nozzle portion and improves a configuration factor which considerably affecting the durability of the body. A rotary nozzle brick body is characterized in that the external shape in plan view is comprised of first circular portions (G), second circular portions (H), third circular portions (K) and tangent lines connecting the first circular portions and the third circular portions so that a substantially elliptical shape is formed by increasing the circular portions and shortening the tangent lines, instead of a substantially egg-like shape having long tangent lines.

Abstract: A rotary nozzle which is simple in construction and easy to manufacture its bricks, has no danger of leakage of molten steel and is capable of rotatably connecting a collector nozzle and a long nozzle. The rotary nozzle includes a fixed plate brick attached to a base member and having at least a sliding surface thereof formed to incline with an angle of .theta..degree., a slide plate surface having at least a sliding surface thereof formed as an inclined surface corresponding to the sliding surface of the fixed plate brick and fixedly mounted, along with a collector nozzle, in a supporting member, and a frame vertically displaceably supporting the supporting member through a plurality of spring means and bolts and adapted to be driven by driving means mounted on the base member. The lower end of the collector nozzle is formed into a spherical shape so as to ensure its smooth connection with a long nozzle and its rotation.

Abstract: A door opening/closing device of door-type rotary nozzle which cannot fit collector nozzle (16) unless clampers are removed. There is no possibility of pouring molten metal while forgetting to remove the clampers (25). When the fixed frame (7) is opened or closed, a ladle is fitted by a 90 degree angle with its bottom almost vertical. So, the fitting and removing operations of the clampers (25) can be performed in front of an operator, which makes the operation very easy.

Abstract: A rotary nozzle in which at least one coil spring is removed, acting to increase the clearance between a surface of the bottom plate brick and a surface of the slide plate brick. This mechanism is capable of improving the pushing force in the vicinity of the nozzle hole, and prevents molten steel leakage, thus prolonging the life of expensive bricks.

Abstract: A slide closure for the pouring nozzle of a molten metal vessel of the type comprising a fixed plate attached to the bottom portion of the vessel and a sliding plate pressed against the lower surface of the fixed plate brick, whereby the sliding plate is rotated to open and close the vessel pouring nozzle, and further comprising a supporting member or rotor adapted to be rotated with the sliding plate brick as a unit by a driving source and supporting means for slidably supporting the rotor and pressing the sliding plate brick against the fixed plate brick with a vessel bed plate serving as a supporting point, characterized in that said supporting means comprises a first supporter for surrounding and slidably supporting the rotor and a second supporter fastened to the vessel bed plate by means of pins with a dish spring interposed between the second supporter and the lower side of the annular projection of the first supporter to enclose the latter whereby the second supporter urges the first supporter upwardl