JP6987684B2 - Sliding nozzle device - Google Patents

Description

The present invention relates to a sliding nozzle device attached to the bottom of a molten metal container such as a molten steel pan to control the flow rate of molten metal, and more particularly to an opening / closing mechanism of a slide metal frame in the sliding nozzle device.

The sliding nozzle device slides (slides) one of the refractory plates having two or three nozzle holes at high pressure (with surface pressure applied). Thereby, the opening degree of the nozzle hole is changed to control the flow rate of the molten metal.

Since the plate will reach the end of its life after several uses, it is necessary to open the slide metal frame when replacing the plate or checking the damage condition. At this time, if the sliding nozzle device is attached to the bottom of the molten steel pot, the slide metal frame and the opening / closing metal frame must be opened from the bottom side of the molten steel pot with the molten steel pot lying down. At this time, the sliding nozzle device is often positioned so that the slide direction of the slide metal frame is the vertical direction.

In such a sliding nozzle device, there are a type in which the slide metal frame is held by the opening / closing metal frame and a type in which the slide metal frame is rotatably held by the fixed metal frame. Of these, in the latter type, and when the elastic body holding part for applying surface pressure to the plate is also rotatably held by the fixed metal frame, the elastic body holding part and the slide metal frame come into contact with each other. Therefore, there is a problem that the slide metal frame cannot be opened at a large angle with respect to the fixed metal frame and a sufficient work space cannot be secured.

Therefore, as an improvement for opening the slide metal frame at a large angle, in Patent Document 1, as shown in FIGS. 5 and 6, the elastic body holding portion 4 is extended from the fixed metal frame 2 to the end side in the longitudinal direction. A bracket 7 extending to the opposite side of the molten metal container is provided, one end of the opening / closing arm 8 is rotatably provided on the bracket 7, and the other end of the opening / closing arm 8 is provided on the slide metal frame 3. The opening / closing mechanism of the slide metal frame connected to 9 is disclosed.
Then, by providing the bracket 7 so as to extend from the fixed metal frame 2 and extend to the side opposite to the molten metal container, the rotation axis of the slide metal frame 3 can be separated from the elastic body holding portion 4, so that the slide can be performed. It is said that contact between the metal frame 3 and the elastic body holding portion 4 can be prevented.

However, when the slide metal frame is held by one opening / closing arm as in the embodiment disclosed in Patent Document 1, there may be a problem that the opening / closing arm is deformed or the opening / closing stability is poor. rice field. That is, although the slide metal frame is opened and closed manually, there is a problem that the resistance at the time of opening and closing is large and a large force is required, so that the slide metal frame cannot be opened and closed smoothly.

JP-A-2017-109207

The problem to be solved by the present invention is in a sliding nozzle device in which two elastic body holding portions are rotatably held by a fixed metal frame, and the slide metal frame is opened at a large angle with respect to the fixed metal frame. The purpose is to prevent deformation of the arm so that it can be opened and closed smoothly.

According to the present invention, the following sliding nozzles (1) and (2) are provided.
(1) A sliding nozzle device attached to the bottom of a molten metal container.
With a fixed metal frame,
A slide metal frame provided on the fixed metal frame so that it can slide and rotate with respect to the fixed metal frame,
It has elastic body holding parts that are rotatably held on both sides of the fixed metal frame.
Further, a first bracket and a second bracket extending from the fixed metal frame and extending to the opposite side of the molten metal container are provided on both ends in the longitudinal direction of the elastic body holding portion, respectively.
The base ends of the first opening / closing arm and the second opening / closing arm are rotatably provided on these brackets.
The other ends of the first opening / closing arm and the second opening / closing arm are connected to the first slide metal frame side connecting portion and the second slide metal frame side connecting portion provided on the slide metal frame.
Moreover, an elastic body is provided between at least one opening / closing arm and the slide metal frame side connecting portion.
A sliding nozzle device in which the slide metal frame is held by two open / close arms and rotates around these rotation axes.
(2) A stopper is provided in the through hole of at least one of the brackets so that the tip thereof is pressed against the base end portion of the opening / closing arm by an elastic body to abut, and the tip of the stopper is fitted to the base end portion of the opening / closing arm. The sliding nozzle device according to (1), which has a possible recess.

In the sliding nozzle device of the present invention, the slide metal frame is held by the two opening / closing arms, and an elastic body is interposed between the opening / closing arm and the slide metal frame side connecting portion, so that the opening / closing arm is prevented from being deformed. The life of the device is improved. In addition, the work can be made lighter because it can be opened and closed smoothly without requiring a large manual force when opening and closing.

It is a front view which shows the sliding nozzle apparatus by one Embodiment of this invention. FIG. 3 is a front view showing a state in which the slide metal frame of the sliding nozzle device of FIG. 1 is opened. FIG. 3 is a detailed view of the vicinity of the first opening / closing arm of the sliding nozzle device of FIG. 1. It is a vertical sectional view around the second bracket of the sliding nozzle apparatus of FIG. It is a perspective view which shows the main part of the sliding nozzle apparatus of Patent Document 1 (FIG. 1 of Patent Document 1). It is a detailed view of the vicinity of the opening / closing arm of the sliding nozzle device of Patent Document 1 (FIG. 3 of Patent Document 1).

Hereinafter, embodiments of the present invention will be described based on the examples shown in the drawings. Since the slide metal frame is opened and closed and the plate is replaced in the sliding nozzle device with the slide metal frame upright, FIGS. 1 to 4 also show the slide metal frame in the vertical state. ..

In FIGS. 1 and 2, the sliding nozzle device 1 is fixedly held to the bottom of a molten metal container and is fixed to a fixed metal frame 2 for holding an upper plate 5 and slidably and rotatably fixed to the fixed metal frame 2. It has a slide metal frame 3 provided on the metal frame 2 and holding the lower plate 6, and elastic body holding portions 4 rotatably provided on both sides of the fixed metal frame 2. Two elastic body holding portions 4 are provided symmetrically with respect to the slide direction center line of the slide metal frame 3, and each is attached to the fixed metal frame 2. Each elastic body holding portion 4 has a spring box that holds a spring as an elastic body, and is rotatably attached to a rotating shaft provided in the fixed metal frame 2. Further, each elastic body holding portion 4 also has a sliding member for sliding with the slide metal frame 3.

Further, the sliding nozzle device 1 has a first bracket 7a provided on the fixed metal frame 2 on the lower end side in the longitudinal direction of the elastic body holding portion 4 as an opening / closing mechanism of the slide metal frame 3, and the first bracket 7a thereof. A first opening / closing arm 8a rotatably provided on the bracket 7a of the above, and a first slide metal frame side connecting portion 9a provided on the slide metal frame 3 for connecting the first opening / closing arm 8a. Have.
Further, also on the upper end side of the elastic body holding portion 4 in the longitudinal direction, a second bracket 7b provided on the fixed metal frame 2 and a second bracket 7b rotatably provided on the second bracket 7b. The opening / closing arm 8b and the second slide metal frame side connecting portion 9b provided on the slide metal frame 3 for connecting the second opening / closing arm 8b are provided. The longitudinal direction is the same as the slide direction of the slide metal frame 3 (plate).

The first and second brackets 7a and 7b are L-shaped and extend from the long side side surface of the fixed metal frame 2 and extend at a right angle to the side opposite to the molten metal container. The central axes of the pins 71a and 71b of the first and second brackets 7a and 7b are the rotation axes of the first and second opening and closing arms 8a and 8b, that is, the rotation axis when opening and closing the slide metal frame 3. Become. That is, it constitutes the first hinge 11a and the second hinge 11b.

As described above, in the sliding nozzle device, the slide metal frame 3 is set up in a vertical state and the sliding surface of the plate is positioned so as to be vertical in order to facilitate the plate replacement when the plate is replaced. As shown in FIG. 1, at the position when the plate is replaced, the first slide metal frame side connecting portion 9a is located on the lower side surface of the lower nozzle holding portion 31 of the slide metal frame 3 on the upper side of the slide metal frame 3. A second slide metal frame side connecting portion 9b is attached.

As shown in FIGS. 1 and 3, the first slide metal frame side connecting portion 9a slides the slide metal frame 3 from the contact surface 91a with the coil spring 10 provided on the lower side thereof and the contact surface 91a. It has an opening / closing arm holding rod 92a extending in parallel with the central axis in the direction. Further, the opening / closing arm holding rod 92a penetrates into the through hole of the connecting block 81a of the first opening / closing arm 8a.

Further, the second slide metal frame side connecting portion 9b has a contact surface 91b with the connecting block 81b of the second opening / closing arm 8b provided on the lower side thereof as shown in FIGS. 1 and 4. It has an opening / closing arm holding rod 92b extending in parallel with the slide direction central axis of the slide metal frame 3 from the contact surface 91b.
The other end (lower end) of the opening / closing arm holding rod 92b is fixedly held by the lower nozzle holding portion 31. Further, the opening / closing arm holding rod 92b penetrates into the through hole of the connecting block 81b of the second opening / closing arm 8b.
That is, the connecting blocks 81a and 81b, which are the other ends of the first opening / closing arm 8a and the second opening / closing arm 8b, receive the weight of the slide metal frame.

When the slide metal frame 3 slides under the surface pressure, the opening / closing arm holding rods 92a and 92b can move in the through holes of the connecting blocks 81a and 81b, respectively.
Here, in FIG. 4, the opening / closing arm holding rod 92b has a columnar shape, and has an enlarged portion 92b-1 having a large outer diameter at one end thereof (contact surface 91b side). Then, after the surface pressure is released when the slide metal frame 3 slides to the lower limit position, as shown in FIG. 4, the enlarged portion 92b-1 of the opening / closing arm holding rod 92b has a through hole 81b-of the connecting block 81b of the second opening / closing arm 8b. Fit with 1 in a small gap. Further, at this time, the contact surface 91b of the second slide metal frame side connecting portion 9b, the slide metal frame receiving surface 83b of the second opening / closing arm 8b, and the slide metal frame side surface and the slide metal frame of the connecting portion block 81b. It comes into contact with the surface of. The contact between these two positions prevents the slide metal frame 3 from rotating with respect to the opening / closing arms 8a and 8b when the slide metal frame 3 is opened.

Further, referring to FIG. 3, here, as an elastic body, between the contact surface 91a of the first slide metal frame side connecting portion 9a and the slide metal frame receiving surface 83a of the connecting block 81a of the first opening / closing arm 8a. The coil spring 10 (compression coil spring) is held. The coil spring 10 is held by the opening / closing arm holding rod 92a penetrating the inside of the coil spring. That is, the first opening / closing arm 8a receives the load of the slide metal frame 3 via the coil spring 10. By arranging the coil spring 10 having an appropriate repulsive force here, a substantially uniform load is applied to the first opening / closing arm 8a and the second opening / closing arm 8b.

On the other hand, FIG. 4 is a vertical cross-sectional view including the central axis of the pin 71b of the second hinge 11b in a state where the slide metal frame 3 is completely closed. The second bracket 7b has two through holes 72b symmetrically with respect to the central axis of the pin 71b, and a stopper 73b having a hemispherical tip in the through holes 72b is a base end portion 85b of the second opening / closing arm 8b. It is arranged in a state of being pressed by a coil spring 74b as an elastic body. The upper surface of the base end portion 85b of the second opening / closing arm has spherical recesses 86b to which the tip of the stopper 73b can be fitted at two locations symmetrically with respect to the central axis of the pin 71b. Further, the amount of bending of the coil spring 74b can be adjusted by the bolt 75b holding the coil spring 74b, and the pressing force of the stopper 73b can be adjusted. That is, by adjusting with the bolt 75b, the force for releasing the stopper 73b can be adjusted.

Next, the movement of the sliding nozzle device of the present invention will be described.
When the plate is replaced, the slide metal frame 3 is in the state of being moved to the lowermost side, and the first slide metal frame side connecting portion 9a of the slide metal frame has the coil spring 10 attached to the connecting block 81a of the first opening / closing arm. The second slide metal frame side connecting portion 9b of the slide metal frame 3 is placed on the connecting block 81b of the second opening / closing arm. In this state, the weight of the slide metal frame 3 is applied substantially evenly to the connecting block 81a and the connecting block 81b by the coil spring 10. When opening and closing the slide metal frame 3, the weight of the slide metal frame 3 can be distributed to the two opening / closing arms 8a and 8b by the coil spring 10, so that deformation of the opening / closing arms 8a and 8b can be prevented. Further, the coil spring 10 and the two opening / closing arms 8a and 8b can maintain the posture of the slide metal frame 3 during opening / closing, and the weights applied to the two hinge portions 11a and 11b can be made substantially equal, which is large. It can be opened and closed smoothly without the need for force.

On the other hand, when the slide metal frame 3 is completely closed as shown in FIG. 4, the tips of the two stoppers 73b provided on the second bracket 7b are provided at two places provided on the base end portion 85b of the second opening / closing arm 8b. Since it fits into the recess 86b of the slide metal frame 3, the rotation of the slide metal frame 3 can be stopped. Therefore, the slide metal frame 3 does not open when the work of closing the elastic body holding portion 4 is performed next time, so that the work safety is improved and the work efficiency is also improved.
When opening the slide metal frame 3, the stopper 73b is easily released by manually rotating the slide metal frame 3. Then, when the slide metal frame 3 is opened 180 degrees, the two stoppers 73b are fitted into the two recesses 86b provided in the base end portion 85b of the opening / closing arm 8b again. Therefore, even if the molten steel pan is tilted, the slide metal frame 3 can be fixed in an open state. Further, the slide metal frame does not move during the plate attachment / detachment work, and the work can be performed safely. Further, a plurality of fixing mechanisms for the slide metal frame by the stopper 73b and the recess 86b can be provided at an arbitrary position, and the opening and closing movement of the slide metal frame can be stopped at a necessary position.

In this embodiment, an elastic body (compression coil spring) is provided between the first opening / closing arm 8a, which is on the lower side when the plate is replaced, and the first slide metal frame side connecting portion 9a. An elastic body may be provided between the second opening / closing arm 8b, which is on the upper side when the plate is replaced, and the second slide metal frame side connecting portion 9b, or an elastic body may be provided on both the upper side and the lower side. .. When an elastic body is provided on the upper side, the elastic body may be, for example, a tension coil spring.
Further, in this embodiment, the stopper 73b is provided on the side of the second bracket 7b that is on the upper side when the plate is replaced, but instead, a stopper is provided on the side of the first bracket 7a that is on the lower side when the plate is replaced. Also, stoppers may be provided on both the upper side and the lower side. In this case, the mechanism of the upper and lower stoppers may be the same.

1 Sliding nozzle device 2 Fixed metal frame 3 Slide metal frame 31 Lower nozzle holder 4 Elastic body holder 5 Upper plate 6 Lower plate 7a First bracket 7b Second bracket 71a Pin 71b Pin 72b Through hole 73b Stopper 74b Coil spring 75b Bolt 8a First opening / closing arm 8b Second opening / closing arm 81a Connecting block 81b Connecting block 81b-1 Through hole 83a Slide metal frame receiving surface 83b Slide metal frame receiving surface 85b Base end 86b Recess 9a First slide metal frame side Connecting part 9b Second slide frame side connecting part 91a Contact surface 91b Contact surface 92a Opening / closing arm holding rod (projection)
92b Open / close arm holding rod (protrusion)
92b-1 Enlarged part 10 Coil spring 11a Hinge 11b Hinge

Claims (3)

A sliding nozzle device attached to the bottom of a molten metal container.
With a fixed metal frame,
A slide metal frame provided on the fixed metal frame so that it can slide and rotate with respect to the fixed metal frame,
It has elastic body holding parts that are rotatably held on both sides of the fixed metal frame.
Further, a first bracket and a second bracket extending from the fixed metal frame and extending to the opposite side of the molten metal container are provided on both ends in the longitudinal direction of the elastic body holding portion, respectively.
The base ends of the first opening / closing arm and the second opening / closing arm are rotatably provided on these brackets.
The other ends of the first opening / closing arm and the second opening / closing arm are connected to the first slide metal frame side connecting portion and the second slide metal frame side connecting portion provided on the slide metal frame.
Moreover, an elastic body is provided between at least one opening / closing arm and the slide metal frame side connecting portion.
A sliding nozzle device in which the slide metal frame is held by two open / close arms and rotates around these rotation axes. The sliding nozzle device according to claim 1, wherein the weight of the slide metal frame is received by the other ends of the first opening / closing arm and the second opening / closing arm. A stopper is provided in the through hole of at least one of the brackets so that the tip thereof is pressed against the base end portion of the opening / closing arm by an elastic body so as to come into contact with the base end portion of the opening / closing arm. The sliding nozzle apparatus according to claim 1 or 2.

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