JPH0718458Y2 - Mounting structure for upper and lower split nozzles to molten metal container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an upper and lower split nozzle mounted on a molten metal container, and particularly to a mounting structure thereof.

[Conventional technology]

The molten metal container is equipped with a nozzle for drawing out the molten metal inside. A mounting means generally called an insertion method is adopted for mounting this nozzle, and a nozzle insertion hole is formed in the bottom plate of the molten metal container, the inner diameter of which gradually decreases toward the outside, Similarly, a nozzle having an outer diameter gradually decreasing outward is also inserted into the insertion hole from the inside of the container. In that case, if the nozzle needs to be replaced with the operating time of the melting container, the nozzle is pulled out to the inside of the container. After withdrawal, it is necessary to insert a new nozzle again from above in the container.
Therefore, in the conventional nozzle insertion method, there is a problem that hot work is extremely difficult and the nozzle cannot be replaced unless the container is sufficiently cooled, thereby impairing the operating efficiency of the container. It was

Therefore, for example, as disclosed in Japanese Utility Model Laid-Open No. 64-5749, a device has been proposed in which a nozzle to be removed is pushed out from the outside of the container toward the inside.

[Problems to be solved by the device]

However, in the above-mentioned known device, a large pressing force must be applied to push out the nozzle that is stuck to the melting container due to seizure with residual metal, etc. It is necessary to provide a means for receiving reaction force. But,
In that case, too, forceless force may be applied to the bottom of the container, which is not so preferable for container maintenance.

In the end, the fact is that the melting container is brought into a maintenance shop, and after cooling, the nozzle is replaced by an interpolating method.

In view of this situation, the present inventor has already proposed in the previous application a method of inserting a nozzle from the outside of the container bottom toward the inside of the container, that is, a nozzle mounting structure of the extrapolation method, but the present invention further improves this. However, it is to further enhance its practicality.

[Means for Solving the Problems]

As a result of various studies conducted by the present inventor in order to achieve the above-mentioned object, this type of nozzle has a lower oxidization rate which is faster than that of the upper part due to repeated immersion in a high temperature mold and exposure to air. In view of the fact that the service life of the nozzle is considerably short, it was thought that the rationality of the entire nozzle replacement work could be improved by replacing the upper part of the nozzle and updating only the lower part, leading to the present invention. It is a thing. That is, the present invention provides a structure for attaching a vertically divided nozzle to a molten metal container, which is characterized in that (a) an upwardly tapered upper portion is formed into a hole of the same shape provided on the bottom plate of the molten metal container. An upper nozzle that is fitted and has a lower portion that tapers downwardly and is located in the vicinity of the bottom plate of the container, and (b) is non-rotatable relative to the base frame provided on the bottom plate of the molten metal container and slides in the axial direction. Movably provided,
A funnel-shaped first suitable for receiving the lower part of the upper nozzle
An annular support, and (c) a first tightening mechanism for upwardly tightening the first annular support, and (d) a downward taper adjacent to the upper end, the upper end surface of which is in close contact with the lower end surface of the upper nozzle. A lower nozzle having a tapered portion of (e) is provided so as not to be rotatable relative to a holder attached to the base frame through a plurality of connecting members and slidable in the axial direction, and A second funnel-shaped second annular support suitable for receiving and supporting; (f) a second tightening mechanism for upwardly tightening the second annular support located in the holder; (g) a lower end of the holder. And a swiveling means for receiving the second annular support body detached from the holder and retracting it outside the region directly below the upper nozzle. It is in.

Of these, the greatest feature of the present invention resides in the mounting structure of the lower nozzle, but the first and second tightening mechanisms in the above configuration of the present invention are both the outer peripheral portion of the first or second annular support. A plurality of first cam projections projectingly provided on the inner peripheral portion of the second cam projections, the same number of which can be engaged with and disengaged from each other. A rotatable tightening ring that can pass through, and a rotating biasing force is applied to the tightening ring, and the first or second cam action between the first and second cam projections causes the first or second wedge to move.
It is preferable that the annular support is always pressed toward the bottom plate.

The elevating means, which is particularly closely related to the mounting and dismounting of the lower nozzle, includes a rod slidably mounted in one of the connecting members and a rack gear engraved in the vertical direction, and a pinion engaged with the rack gear. And the swiveling means, which is also associated with the attachment and detachment of the lower nozzle, is an arm having a C-shaped portion pivotably supported on the lower part of the rod and receiving the lower part of the second annular support. It is preferable.

[Action]

The mechanism itself in which the second fastening mechanism pushes the upper end of the lower nozzle to the lower end of the upper nozzle via the second annular support is the same as the mechanism in which the first fastening mechanism moves the upper nozzle to the bottom plate of the molten metal container via the first annular support. This is the same as the mechanism for pushing into the hole of the present invention, and this is as described in the specification of the above-mentioned prior application by the present inventor.

However, there is a remarkable effect that the upper nozzle is "re-tightened" to the container bottom hole by pressing the lower nozzle upward by the second tightening mechanism.

Further, according to the present invention, a holder for attaching the second annular support and a second holder for attaching the second annular support to the base frame of the molten metal bottom plate to which the first tightening mechanism supporting the first annular support is attached via the connecting member and the swing hinge. Since the second tightening mechanism, which is also attached with the tightening mechanism and is supported by the connecting member, internally houses the elevating means for the second annular support, and the turning means is connected to the elevating means. , These parts are organically linked to each other to make the whole device compact with a small number of parts, and also have a rational structure in which its operation is not wasted. When removing the lower nozzle, first, by loosening the second tightening mechanism, the engagement between the first cam projection and the second cam projection is released, and the second annular support is moved by the former passing through the latter. The turning means is turned to a position for supporting the second annular support before starting to show a descending tendency due to its own weight, and the elevating means connected to the turning means after the second annular support is received and supported. Is lowered, the lower nozzle first takes a posture sufficiently separated from the lower nozzle. After that, the swirling means is swung in the opposite direction to retract the lower nozzle from the region directly below the upper nozzle. At this retracted position, the old lower nozzle to be replaced is removed from the swivel means, a new lower nozzle is mounted on the swivel means, and the above operations are performed in the reverse order thereafter. It is pressed in the state of being in close contact with the lower end and the operating posture is taken.

Further, if the second tightening mechanism is turned by the turning hinge included in the connecting member, the upper nozzle can be attached and detached freely.

〔Example〕

As shown in FIG. 1, a molten metal container 1, for example, a tundish is provided with a lining brick 3 and a nozzle insertion hole 4 is opened. A base frame 11 is attached to the container bottom 2 via a mounting member 11 ', for example, a bolt.
A portion of 11 facing the nozzle insertion hole 4 is cut off, and a ring seat 12 is fixed thereto.

The funnel-shaped first annular support 14 for supporting the upper nozzle 10 and thus the first tightening mechanism is constructed as follows.

That is, the ring seat 12 has the second cam projection 1 on the inner circumference of the lower part thereof.
A tightening ring 13 having a protruding 3'is rotatably fitted therein. A rack gear 16 is attached to the outer peripheral surface of the tightening ring 13 as an example of a rotating means, and when the pinion 17 meshing with the rack gear 16 is rotated by a rotating lever 18, the tightening ring 13 rotates in a required angle range. .

On the other hand, a first annular support body 14 having an outer diameter that is loosely fitted to the ring seat 12 and the tightening ring 13 is provided so as to be slidable in the axial direction with respect to the ring seat 12, but not relatively rotatable.
The first annular support 14 is provided with a funnel-shaped nozzle holding hole 5 which is fitted to the downwardly tapered lower portion 10b of the upper nozzle 10 so as to axially penetrate therethrough.

First cam projection 14 'formed on the outer periphery of the first annular support 14
Is the same number as the second cam projections 13 'of the tightening ring 13, the former projections 14' can pass through the space (space) between the latter projections 13 'toward the molten metal container, and then the tightening When the ring 13 is turned, each protrusion 13 ', 14' is attached to the first annular support 1
The parts on the 4 side are overlapped with each other so as to occupy the position close to the molten metal container 1, and the tightening ring 13 and the first annular support 14 are engaged with each other. If the upper nozzle 10 is inserted through the nozzle holding hole 15 prior to this engagement, the lower portion of the nozzle 10 is supported by the first annular support 14. Therefore,
The first annular support 14 in this state is tightened as described above.
When tightened by 13, the projections 13 ', 14' are in sliding relation with each other by the cam surface, so that the upwardly tapered portion 10a of the upper nozzle 10 is firmly pressed into the nozzle insertion hole 4 of the container 1. It

After the upper nozzle 10 is set as described above, the ratchet wheel 19 fixed to the support shaft 17 'concentrically with the pinion 17 is rotated by the lever 18 attached to the upper part of the support shaft. The claw 20 bites in and the set state is maintained.

Since the upper nozzle 10 set in the insertion hole 4 may be loosened due to thermal stress during operation, the first tightening mechanism described above is always urged to rotate in the tightening direction with respect to the tightening ring 13. A loosening prevention device is also provided. As shown in FIG. 4, the strong extension spring 21 constantly applies torque to the torque arm 22 fixed to the ratchet wheel 19,
If the nozzle 10 shows a tendency to loosen, the wheel 19, pinion 17
And, the tightening ring 13 is automatically rotated through the rack gear 16 to strongly push the nozzle 10 into the insertion hole 4.

Reference numeral 10 'is a heat insulating cushioning material for improving adhesion, and reference numeral 12' is a meshing portion for preventing co-rotation between the tightening ring 13 and the first annular support 4.

When replacing the upper nozzle 10, replace the claw 20 with the ratchet wheel.
Then, the procedure may be reversed from the above procedure.

The funnel-shaped second annular support 34 that supports the lower nozzle 30 and the second tightening mechanism for the funnel-shaped second support 34 are configured as follows.

That is, the second tightening mechanism is supported by the bracket 23 serving as a plurality of connecting members and the swing hinge 23 'attached to the bracket 23, and the cylinder 24 fixed to the second tightening mechanism serves as the holder. A cylindrical tightening ring 33 is arranged below the upper nozzle 10, and a second cam projection 33 'is formed on the inner peripheral surface thereof so as to project. In the second annular support 34 having the first cam projection 34 'whose lower surface engages with the upper surface of the second cam projection, the downward tapered portion 30 of the lower nozzle 30 is provided.
A funnel-shaped nozzle holding hole 35 conforming to b is provided so as to penetrate in the axial direction. And a tightening ring as a holder
A gear 36 is provided on the outer periphery of the upper portion of 33, and meshes with a double-gear-shaped pinion 37. The upper gear 37a of the pinion 37 is operably connected to a drive gear 38 via an intermediate gear 37 ', and is connected to a corner apex 38' of the drive gear, which is not shown in the figure and is used when operating the tightening mechanism. A torque wrench is fitted. A mechanism for preventing the second annular support member 34 from rotating together with the tightening ring 33 as the holder is omitted in the drawing.

Like the first tightening mechanism, the second tightening mechanism is also provided with a ratchet device for maintaining the angle of the tightening ring 33 and a spring type loosening prevention device, but they are not shown in the drawing either. .

The structure peculiar to the present invention is such that one of the connecting members is a slidably mounted inside the cylinder 24, a rod 40 having a rack gear 40a vertically engraved therein, and a pinion 41 engaged with the rack gear 40a. Of the rod 40
An arm 42 having a C-shaped portion 42a pivotably supported on the lower part of the second support 34 for supporting the lower part of the second annular support 34 constitutes the above-mentioned turning means.

The lower nozzle 30 whose upper end is pressed against the lower end of the upper nozzle 10 as shown in FIG.
To retract from 10, first rotate the arm 42 as shown in FIG. 2 to fit the C-shaped portion 42a into the body of the lower nozzle 30,
The drive gear 38 'is reversed with a torque wrench. As a result, the engagement between the first and second cam projections 34 ', 33' is released, and the lower nozzle 30 is lowered by its own weight along with the second annular support 34, and the support is C-shaped of the arm 42. Received by the portion 42a.

After that, the pinion 4 engaged with the rack gear 40a of the rod 40
By rotating 1 with a torque wrench (not shown), the rod 40 is lowered as shown in FIG. 3, and then the arm 42 is swung as shown by the chain line in the figure, whereby the lower nozzle to be replaced is replaced.
30 can be removed from the C-shaped portion 42a of the arm. After removing, install a new lower nozzle 30 into the C-shaped portion 42a.
The upper end of the new nozzle can be brought into close contact with the lower end of the upper nozzle 10 by placing the new nozzle in the reverse order from the above. When the upper nozzle 10 is replaced, it can be smoothly performed by revolving and retracting the second tightening mechanism by the revolving hinge 23 '.

Needless to say, various modifications can be made to the above-described embodiment of the present invention. For example, the sleeve 17a for inserting and supporting the support shaft 17 'in the first tightening mechanism is extended downward, If the lower part is used as the cylinder 24 of the second tightening mechanism, the whole device becomes more compact, which is convenient.

[Effect of device]

According to the present invention, the nozzle attached to the molten metal container can be divided into upper and lower halves, and the lower nozzle that is quickly worn can be updated very easily. Can be solved at once.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a longitudinal sectional view, and FIG.
Fig. And Fig. 3 are vertical cross-sectional views of essential parts showing a state during operation,
FIG. 4 is a cross-sectional view of the first tightening mechanism, and FIG. 5 is a plan view of the turning means. 2 ... Bottom plate, 10 ... Upper nozzle, 10a ... Upper part of upper nozzle, 10b ... Lower part of upper nozzle, 11 ... Base frame, 13 ... One member of the first tightening mechanism and holder , ............ first annular support, 23 ... bracket, 24 ... cylinder as connecting member, 30 ... lower nozzle, 30b ... downward taper portion of lower nozzle, 33 ... 2 Tightening ring as one member of the fastening mechanism and as a holder, 34 ...... second annular support, 40 ...... rod with rack gear as lifting means, 41 ...... also pinion, 42 ...... as turning means Arm, 42a ... C-shaped part of the arm.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoji Yonezawa 1-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramics Co., Ltd. (72) Makoto Nakamura 1-1-3, Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramics Co., Ltd. (72) Inventor, Torata Tanaka, Higashi-Arioka 2-25, Itami City, Hyogo Prefecture

Claims (4)

[Scope of utility model registration request] (A) An upper nozzle in which an upwardly tapered upper portion is fitted in a hole of the same shape provided in a bottom plate of a molten metal container, and a lower portion is downwardly tapered and located in the vicinity of the container bottom plate. And (b) is provided so as not to be rotatable relative to the base frame provided on the bottom plate of the molten metal container and slidable in the axial direction,
A funnel-shaped first suitable for receiving the lower part of the upper nozzle
An annular support, and (c) a first tightening mechanism for upwardly tightening the first annular support, and (d) a downward taper adjacent to the upper end, the upper end surface of which is in close contact with the lower end surface of the upper nozzle. A lower nozzle having a tapered portion of (e) is provided so as to be non-rotatable relative to a holder attached to the base frame via a plurality of connecting members and slidable in the axial direction, and A funnel-shaped second annular support suitable for receiving and supporting; (f) a second tightening mechanism for upwardly tightening the second annular support located in the holder; (g) more than the lower end of the holder. A lifting means for separating the second annular support member downward, and (h) a swiveling means for receiving the second annular support member separated from the holder and retracting it outside the region directly below the upper nozzle. Molten metal container with upper and lower split nozzles Mounting structure. 2. The same number of the first and second tightening mechanisms that are engageable with and disengageable from a plurality of first cam protrusions that project from the outer peripheral portion of the first or second annular support. A rotatable tightening ring having a second cam projection on its inner peripheral portion and allowing the first cam projection to pass through a space between the second cam projections in the vertical direction, and a rotational biasing force applied to the tightening ring. 2. The molten metal for the upper and lower split type nozzles according to claim 1, wherein the first or second annular support is constantly pressed toward the bottom plate by the cam action between the first and second cam projections. Mounting structure to the container. 3. A rod in which one of the connecting members is slidably mounted and which has a rack gear vertically engraved, and a pinion meshed with the rack gear constitute the elevating means.
The upper and lower split molds according to claim 1 or 2, wherein an arm having a C-shaped portion pivotably supported on the lower part of the rod and supporting the lower part of the second annular support member constitutes the swivel means. Mounting structure for the nozzle to the molten metal container. 4. A molten metal container for an upper and lower split type nozzle according to claim 1, wherein one of the connecting members for attaching the holder to the base frame has a turning hinge for turning the holder. Mounting structure.