JPH0647166B2 - Nozzle holding device for molten metal container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention holds a nozzle such as a long nozzle or a dipping nozzle connected to a pan or a tundish directly or via a sliding nozzle, or a nozzle below the sliding nozzle. Nozzle holding device for.

[Conventional technology]

Conventionally, in continuous casting equipment, in order to adjust the outflow amount of molten steel by pouring molten steel from a ladle into a tundish, an immersion nozzle is detachably connected to the lower part of this tundish.

This immersion nozzle is supported by a holding device so that it can be easily attached to and detached from the tundish, and it is removed during repair work of the tundish or maintenance and inspection of the nozzle itself, and quickly connected to the tundish in preparation for operation start. This is necessary as a function of this holding device.

Conventionally, as such a holding device, a holding device that mainly uses a bayonet mechanism to connect the nozzle to the tundish has been used, but the setting of the sealing pressure is not uniform, and moreover, the sealing pressure is set by the compression of the joint material. However, there is a problem that periodical tightening work is required.

As measures against this, as described in Japanese Utility Model Laid-Open No. 56-65766, a seal pressure is maintained using an air cylinder, and Japanese Utility Model Publication No. 53-14333.
There is a nozzle holding device having a structure utilizing the elastic force of a spring, which is described in Japanese Patent No.

[Problems to be solved by the invention]

However, in the configuration with an air cylinder, it is necessary to connect a hose for supplying compressed air for crimping the nozzle to the tundish, and if the crimping force of only the cylinder causes a hindrance to the air or its piping, this is not possible. Since it is sufficient, a backup device must be attached, and the device becomes complicated and maintenance and inspection are complicated.

Further, in the case where the spring is provided, similarly to the above, the nozzle cannot be attached to the tundish in the close contact state only by the elastic force, and the attached equipment is required. Also, by deploying this accessory device, the device becomes larger and the biasing device is arranged on the side of the tundish,
There is a problem in that it is extremely difficult to perform centering at the time of connecting the nozzle, and one operator cannot replace the nozzle or perform the device.

An object of the present invention is to reliably connect a nozzle to a molten steel receiving container such as a tundish with a device having a small capacity without lowering the sealing pressure.

[Means and Actions for Solving Problems]

The nozzle holding device of the present invention comprises a hanger (1) for holding a nozzle for connecting a molten metal container, and an opening / closing metal frame of a sliding nozzle device attached to the lower surface of the molten metal container.
A guide (4) attached to (54), a bracket (2) which is vertically inserted through the guide (4) and is supported so as to be vertically movable, and which is integrated with the hanger (1); and the guide (4) The urging plate (6) which is located on the lower surface of the bracket and is connected to the lower surface of the bracket (2) so as to move up and down, and the urging plate (6) is inserted so that the guide (4) can move up and down. (2) and a screw rod (5) communicating with the urging plate (6), and the urging plate built in the bracket (2).
It is characterized by having an elastic body (20) which applies an elastic reaction force downward to (6).

When the screw rod that passes through the urging plate and the bracket is raised with respect to the guide, the urging plate and the bracket are also raised together, and the elastic body is compressed by this, and the reaction force is downward with respect to the urging plate. Act on. Then, this reaction force acts as a sealing force for the sliding nozzle device of the connecting nozzle held by the hanger via the bracket.

〔Example〕

 The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a sectional view of equipment in which a nozzle holding device D of the present invention holds an immersion nozzle C connected to a sliding nozzle B below a tundish A, and FIG. 2 is a bottom view of the same.

In the figure, 50 is a fixed frame that stands still at the spout a portion of the tundish A and supports the upper fixed plate 51, 52 is a sliding plate that moves forward and backward in the horizontal direction by a drive device 53 arranged on the fixed frame 50, and 54 is An open / close metal frame that is integrated with the fixed frame 50 and supports the lower fixed plate 55.

FIG. 3 is an exploded perspective view of the nozzle holding device D, 1 is a hanger for suspending and holding the immersion nozzle C via a nozzle holding ring E, 2 is a thick-walled cylindrical bracket for connecting the hanger 1 with bolts 3, Reference numeral 4 denotes a guide having an upper end fixed to the opening / closing metal frame 54 and externally inserting the bracket 2 so as to be able to move up and down. Reference numeral 5 denotes a screw rod coaxially screwed to the guide 4, and 6 is a biasing force that is supported by the screw rod 5 and moves up and down. It is a plate.

The guide 4 has a flange formed at the upper end, is fixed to the open / close metal frame 54 by the bolt 9, and the screw rod 5 is screwed and coupled to the female screw 11 formed in the cylindrical portion 10 extending downward.

The bracket 2 has a hollow portion for accommodating a spring, in which a fitting insertion portion 12 of the guide 4 is formed in the axial direction and the lower end is opened inside.
Four 13 and an engaging hole 14 for opening the upper and lower ends to connect the bracket 2 to the open / close metal frame 54 side through the guide 4 are formed in the axial direction.

The bracket 2 is fitted with a bush 15 and fitted into the guide 4, and the engagement pin 16 slidable in the engagement hole 14 is fixed to the opening / closing metal frame 54 as shown in FIG. Is engaged with the upper end of.

The urging plate 6 is a disc-shaped member arranged on the lower surface side of the bracket 2, and is movably connected to the bracket 2 by connecting shafts 17 inserted in two radial positions thereof in a loose fit manner. ing. Then, the screw rod 5 screwed to the guide 4 penetrates the center portion of the biasing plate 6 in a loose fitting manner, and allows the biasing plate 6 to move relative to the screw rod 5 in the axial direction thereof.

A block 19 for rotating operation is connected to the lower part of the screw rod 5 by a pin 18, and when this block 19 is rotated from the outside, the screw rod 5 rotates in the guide 4 to move up and down, and the bracket 2 and this The hanger 1 connected to can be moved up and down with respect to the open / close metal frame 54.

Further, 20 is a compression coil spring which is arranged in the cavity 13 and which forms an elastic body, and has a pressing body 21 fixed to the urging plate 6 at the lower end.
Are in contact with each other in the cavity 13.

The dipping nozzle C is held in close contact with the lower surface of the lower fixing plate 55 of the sliding nozzle B as shown in FIG.

FIG. 5 is a sectional view showing a state before the immersion nozzle C is connected to the lower fixing plate 55 by incorporating the nozzle holding device D into the hanger 1 through the nozzle holding ring B, and the screw rod 5 is located at the maximum downward position. , Immersion nozzle C upper and lower fixing plate
55 Separated from the bottom surface. Before this mounting, mortar or packing material is arranged on the upper surface of the immersion nozzle C so that the seal at the time of connection can be maintained.

Here, when the block 19 is rotated to move the screw rod 5 upward as shown in FIG. 6, the bias plate 6 is pushed together with the screw rod 5.
Also, the bracket 2 and the hanger 1 integrated with the urging plate 6 are also displaced upward so that the upper end surface of the immersion nozzle C is brought into contact with the lower surface of the lower fixing plate 55.

In this state, no compressive force is applied to the coil spring 20, and the fastening force of the screw 5 to the guide 4 is transmitted as it is as a contact force between the immersion nozzle C and the lower fixing plate 55, thereby forming a dynamic system.

Next, when the screw rod 5 is further rotated by the block 19, the hanger 1 and the bracket 2 integrally connected to the hanger 1 are restrained from being displaced upward by the contact between the immersion nozzle C and the lower fixing plate 55. The coil spring 20 receives a compressive force by the upward displacement of the biasing plate 6 based on this rotation.

FIG. 1 shows the immersion nozzle C in which the screw rod 5 is moved upward by the maximum amount.
In the state where the urging plate 6 is mounted, the urging plate 6 rises until it comes into contact with the lower surface of the bracket 2 to compress the coil spring 20, and the elastic force of the coil spring 20 applies a downward reaction force to the urging plate 6. To do.

Here, the axis of the screw rod 5 for supporting the biasing plate 6 in the axial direction is located in the vertical plane together with the C axis of the submerged nozzle to be connected and has an axial distance, so that the coil spring 20 is prevented from moving downward. In FIG. 1, the force acts on the immersion nozzle C in the clockwise upward direction. Therefore, the immersion nozzle C is biased upward, the reaction force of the coil spring 20 can be converted into the sealing pressure with the lower fixing plate 55, and the immersion nozzle C can be firmly connected.

In the above structure, since the coil springs 20 are symmetrically arranged in the radial direction with respect to the screw rod 5, the reaction force to the urging plate 6 can be evenly distributed and the hanger 1 and the bracket 2 can be smoothly moved up and down. it can. Further, in the case of this example, by arranging the coil springs 20 in the circumferential direction, the device capacity can be made smaller and compact, and even if a part of the coil springs 20 is damaged, a plurality of them are arranged to ensure reliable operation. Also, since the parts are the same, production and management are easy.

To remove the immersion nozzle C, the reverse operation to the above may be performed.

FIG. 7 is a cross-sectional view of a main part showing a configuration in which the bracket 2 is rotatable with respect to the guide 4, and FIG. 8 is a perspective view of an upper end surface of the guide 4.

In this example, the engaging pin 16 for connecting the bracket 2 to the guide 4 is movable with respect to the guide 4, so that 30 is an elongated slide hole penetrating the flange 31 of the guide 4, and a step portion is provided inside. Forming 32. The engaging pin 16 uses a bolt to pass through the slide hole 30, and at the upper end, a nut 33 supported by a step portion 32 is screwed and a washer 34 is arranged on the lower surface side of the step portion 32. . The circumferential length of the slide hole 30 is such that centering can be performed when the immersion nozzle C and the lower fixing plate 55 are connected, and the rotation stroke of the guide 4 is regulated so that the engagement pin 16 slides. The immersion nozzle C is located at the position of the connection core when it comes into contact with one end of the 30 and cannot rotate.

Other configurations are the same as those described above, and the immersion nozzle C is used.
Can be connected to the lower fixing plate 55 with a constant crimping force. When the connection is disconnected and the immersion nozzle C is replaced or repaired, the bracket 2 can be rotated around the guide 4 to shift the immersion nozzle C to a position deviated from the axial position of the sliding nozzle B.

FIG. 9 is a cross-sectional view of an essential part showing another structure that allows the bracket 2 to rotate. This is a circular sliding groove on the lower surface of the opening / closing metal frame 54.
35 is formed, and the flange 31 of the guide 4 is slidable in the sliding groove 35.

If the bracket 2 has a structure in which it is engaged with the guide 4 by the engagement pin 16 as in the above example, when the bracket 2 is rotated, the bracket 2 and the hanger 1 and the guide 4 can be pivotally shifted in any direction. Reference numeral 36 is a stopper pin fixed to the lower surface of the opening / closing metal frame 54 for centering and positioning, and is for engaging with the side portion of the guide 4 to set the immersion nozzle C coaxially with the lower fixing plate 55. is there.

Further, FIG. 10 is a cross-sectional view of a main part showing another example, in which a circular cavity 37 is formed on the lower surface of the opening / closing metal frame 54 as in the above example,
The support portion 38 at the upper end of the guide 4 is rotatably accommodated in the hollow portion 37, and the stopper pin 39 for centering and positioning is provided on the lower surface of the open / close metal frame 54 as described above.

Also in this example, when the immersion nozzle C is connected, the guide C is swung to slide the nozzle C into the sliding nozzle B.
It can be located away from the axial position.

FIG. 11 is a sectional view showing still another embodiment, in which the arrangement of the elastic body is different, and the guide 4 is provided with an annular cavity 40 so as to be coaxial with the screw rod 5. It has a structure in which double coil springs 41 and 42 are incorporated. At the lower ends of the coil springs 41 and 42, pressing bodies 21 that apply an elastic reaction force to the urging plate 6 are arranged at a plurality of positions, and the urging plate 6 is rotated relative to the urging plate 6 in the above-mentioned respective examples. Similarly, the acting force can be applied in the sealing direction.

In the above embodiment, the nozzle holding device D is arranged in the open / close metal frame 54 of the sliding nozzle B, but in addition to this, a sliding metal frame of a two-way sliding nozzle or a container of a type not using a sliding nozzle is used. It can also be placed in the shell.

Further, although the embodiment has shown the configuration in which the immersion nozzle C is attached to the lower fixed plate 55, the immersion nozzle may be attached to the lower fixed plate 55 via the lower nozzle. Further, it can be used not only for the immersion nozzle but also for replacement work of the lower nozzle and the long nozzle.

[Effects of the Invention] The nozzle holding device according to the present invention has the following effects due to its configuration.

(1) In addition to the rigid mechanical force, the elastic force of the elastic body can be used to maintain a reliable seal and connect the nozzles.

(2) The sealing pressure does not fluctuate unless the mechanical force for connection is released, so that stable sealing pressure can be maintained.

(3) Due to the above (2), retightening work during operation is not required, and it is possible to improve the life of refractory, the quality of steel, and the yield by preventing the intake of air.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part in which the nozzle holding device of the present invention is arranged under a sliding nozzle (viewed from the line II in FIG. 2), FIG. 2 is a bottom view of the same, and FIG. 3 is an exploded view of the holding device. FIG. 4 is a perspective view, FIG. 4 is a cross-sectional view taken along the line II-II of FIG. 2, FIG. 5 is a cross-sectional view of a main part before the nozzle is mounted, and FIG. 6 is a cross-sectional view showing a state before urging, FIG. Is a sectional view of an essential part when the bracket is rotatable, FIG. 8 is a perspective view of an upper end portion of the guide in FIG. 7, and FIGS. 9 and 10 are sectional views of an essential part showing a structure in which the guide is rotatable. FIG. 11 and FIG. 11 are cross-sectional views of main parts when a double coil spring is made of an elastic body. (1) …… Hanger, (2) …… Bracket (4) …… Guide, (5) …… Screw rod (6) …… Biasing plate, (12) …… Fit insertion part (13) …… Cavity part , (14) …… Engagement hole (15) …… Bush, (16) …… Engagement pin (17) …… Connection shaft, (19) …… Block (20) …… Coil spring (elastic body) ( A) …… Tundish (B) …… Sliding nozzle (C) …… Immersion nozzle (D) …… Nozzle holding device (E) …… Nozzle holding ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruo Aoki 4-24-105 Kamitotsu, Kokurakita-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture (72) Junichi Funawato 2-1-1, Nishinarmizu, Hachimansai-ku, Kitakyushu, Fukuoka

Claims (1)

[Claims] 1. A hanger (1) for holding a nozzle for connecting a molten metal container, and a guide (4) mounted on an opening / closing metal frame (54) of a sliding nozzle device attached to the lower surface of the molten metal container. A bracket (2) which is vertically inserted through the guide (4) and is movably supported and which is integrated with the hanger (1); and the bracket (2) which is located on the lower surface of the guide (4). The urging plate (6) connected to the lower surface side of the pedestal and the bracket (2) and urging plate (6) so that the urging plate (6) can be inserted into the urging plate (6) and moved up and down to the guide (4). A molten metal container characterized in that it has a screw rod (5) for connection and an elastic body (20) built in the bracket (2) and applying an elastic reaction force downward to the urging plate (6). Nozzle holding device.