JPS6213256A - Nozzle holder of vessel for molten metal - Google Patents

Abstract

PURPOSE:To surely connect a nozzle with a device of the smaller capacity than the capacity of a vessel for receiving a molten steel without decreasing the sealing pressure thereof by exerting rigid mechanical force by the elastic force of an elastic body to an arm integrally formed with a hanger for holding the nozzle. CONSTITUTION:An energizing plate 6 ascends until said plate contacts with the bottom surface of a bracket 2 and compresses a coil spring 20 while an immersion nozzle C is held mounted by moving a screw rod 5 upward to the max. extent. The elastic force of the spring 20 loads the downward reaction to the plate 6. The axial line of the rod 5 supporting the plate 6 in the axial line direction is positioned on the perpendicular plane together with the axis of the nozzle C to be connected thereto and is disposed to have an inter-axis distance; therefore, downward reaction of the spring 20 is acted upward to the nozzle C in the clockwise direction. The nozzle C is eventually energized upward and the reaction of the spring 20 is made convertible to the sealing pressure of a lower fixing plate 55. The nozzle C is thus securely connected.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is for holding a nozzle such as a long nozzle, a submerged nozzle, or a lower nozzle of a sliding nozzle that is connected to a pot or tundish directly or through a sliding nozzle. The present invention relates to a nozzle holding device.

[Conventional technology]

Conventionally, in continuous casting equipment, in order to pour molten steel from a ladle into a tundish and adjust the flow rate of the molten steel, an immersion nozzle is detachably connected to the lower part of the tundish.

This immersion nozzle is supported by a holding device so that it can be easily attached to and removed from the dandy can, and can be removed for repair work on the dandy 7 or for maintenance and inspection of the nozzle itself, and can be quickly connected to the dandy can in preparation for the start of operation. This is necessary as a function of this holding device.

Conventionally, such a holding device has mainly used a bayonet mechanism to connect the nozzle to the tundish. This causes problems such as the need for periodic retightening work.

To deal with this, there are methods that maintain sealing pressure using an air cylinder as described in Japanese Utility Model Publication No. 56-65766, and Japanese Utility Model Publication No. 53-14333.
There is a nozzle holding device that utilizes the elastic force of a spring and is described in the above publication.

[Problem that the invention seeks to solve]

However, in a configuration equipped with an air cylinder, it is necessary to connect a hose for supplying compressed air in order to press the nozzle to the tundish, and the pressure applied by the cylinder alone is insufficient in the event of a problem with the air or its piping. Therefore, a back-up device must be attached, which makes the device complicated and maintenance and inspection complicated.

Furthermore, in the case of a device equipped with a spring, the nozzle cannot be attached to the tundish in a tight state by its elastic force alone, as described above, and additional equipment is required. In addition, by providing this accessory device, the device becomes larger, and the biasing device is placed on the side of the tundish, so
There is a problem in that it is extremely difficult to center the nozzles when connecting them, and the nozzles cannot be replaced or installed by a single worker.

An object of the present invention is to enable a nozzle to be reliably connected to a molten steel receiving container such as a tundish with a small capacity device without reducing seal pressure.

[Means and effects for solving the problems] The nozzle holding device of the present invention includes an arm formed with a hanger for holding the nozzle at one end, and the other end of the arm extending downward from the bottom surface of the molten metal container and being inserted through the arm. A guide that supports the arm in a vertically movable manner, a biasing plate located on the underside of the guide and connected to the arm in a vertically movable manner, and a biasing plate that is inserted through the biasing plate and screwed together in the extension direction of the guide. A screw rod connects the board so that it can be raised and lowered as a guide,
The structure includes an elastic body built into the guide insertion side of the arm that applies an elastic reaction force downward to the biasing plate, and the nozzle uses the elastic reaction force of the elastic body to ensure sealing pressure. It is something.

〔Example〕

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

FIG. 1 is a sectional view of a facility in which a submerged nozzle C connected to a sliding nozzle B at the bottom of a tundish A is held by the nozzle holding device of the present invention, and FIG. 2 is a bottom view of the equipment.

In the figure, 50 is a fixed frame that rests on spout a portion of tundish A and supports the upper fixed plate 51, 52 is a sliding plate that moves horizontally forward and backward by a drive device 53 disposed on this fixed frame 50, and 54 is an opening/closing 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, in which 2 is a hanger that suspends and holds the submerged nozzle C via a nozzle holding ring E, 2 is a thick cylindrical bracket that connects this hanger 1 with a bolt 3, Reference numeral 4 denotes a guide whose upper end is fixed to the opening/closing metal frame 54 and the bracket 2 is inserted so as to be able to rise and fall freely, 5 is a threaded rod coaxially screwed into this guide 4, and 6 is an urging force supported by this threaded rod 5 to move up and down. It is a board.

The guide 4 has seven flange formed at its upper end and is fixed to the opening/closing metal frame 54 with a bolt 9, and a threaded rod 5 is screwed into a female thread 11 formed in a cylindrical portion 10 extending downward.

The bracket 2 has a fitting part 12 for the guide 4 in the axial direction, and has four hollow parts 13 for storing springs whose lower ends are open, and the bracket 2 is opened at both upper and lower ends so that the bracket 2 can be inserted through the guide 4. Engagement holes 14 are respectively formed in the axial direction for connection to the opening/closing metal frame 54 side.

This bracket 2 is attached with a bushing 15 and inserted into the guide 4, and as shown in FIG.
It is engaged with the upper end of 4.

The biasing plate 6 has a disc shape, and a connecting shaft 17 is loosely fitted into two positions in the radial direction so as to be able to move up and down in the vertical direction, and the connecting shaft 17 is integrated with the lower surface of the bracket 2. is inserted so that it can rotate freely.

A block 19 for rotation 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 within the guide 4 and moves up and down, and the bracket 2 and this The hanger l connected to can be raised and lowered relative to the opening/closing metal frame 54.

Further, reference numeral 20 denotes a compression coil spring serving as an elastic body disposed in the cavity (3), and a pressing body 21 fixed to the biasing plate 6 is in contact with the lower end within the cavity 13.

With the nozzle holding device configured as described above, the submerged 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 cross-sectional view showing the state before the nozzle holding device is assembled into the hanger 1 via the nozzle holding ring E and the submerged nozzle C is connected to the lower fixing plate 55. The submerged nozzle C is positioned downward by the maximum amount until it engages with the second engagement hole 14, and the upper end of the submerged nozzle C is separated from the lower surface of the lower fixing plate 55. Before this installation, mortar or packing material is placed on the top surface of the immersion nozzle C to maintain a seal during connection.

Here, when the block 19 is rotated to move the screw rod 5 upward as shown in FIG. 6, the biasing plate 6 also rises together with the screw rod 5, and the bracket 2 and The hanger I is also displaced upward to bring the upper end surface of the submerged nozzle C 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 tightening force of the threaded rod 5 to the guide 4 remains unchanged. ! This becomes a dynamic system in which the contact force is transmitted between the nozzle C and the lower fixed plate 55.

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

Figure 1 shows the immersion nozzle C with the screw rod 5 moved upward by the maximum amount.
is attached, the biasing plate 6 rises until it contacts the bottom surface of the bracket 2 and compresses the coil spring 20, and the elastic force of the coil spring 20 applies a downward reaction force to the biasing plate 6. do.

Here, the axis of the screw rod 5 that supports the biasing plate 6 in the axial direction is located in a vertical plane together with the C-axis of the connected submerged nozzle, and is arranged with a distance between the axes, so the coil spring 20
The downward reaction force acts on the submerged nozzle C in an upward clockwise direction in FIG. Therefore, the immersed nozzle C is forced upward, and the reaction force of the coil spring 20 can be converted into sealing pressure with the lower fixing plate 55, allowing the immersed nozzle C to be firmly connected.

In the above configuration, since the coil spring 20 is arranged radially symmetrically with respect to the screw rod 5, the biasing tff16
It is possible to evenly distribute the reaction force against the hanger 1 and the bracket 2, and to make the vertical movement of the hanger 1 and the bracket 2 smooth. In addition, in this example, by arranging the coil springs 20 in the circumferential direction, the capacity of the device can be reduced and the device becomes compact, and even if some of the coil springs 20 are damaged, the operation is reliable by arranging a plurality of coil springs 20. Also, since the parts are the same, manufacturing and management are simple.

Incidentally, in order to remove the nozzle C, it is sufficient to perform the operation opposite to the above.

FIG. 7 is a sectional view of essential parts showing a structure in which the bracket 2 is rotatable relative to the guide 4, and FIG. 8 is a perspective view of the upper end surface of the guide 4.

In this example, an engagement pin 16 that connects the bracket 2 to the guide 4
is movable with respect to the guide 4, and 30 is an elongated slide hole inserted through the flange 31 of the guide 4, and has a stepped portion 32 formed inside. The retaining pin 16 is inserted through this slide hole 30 using a bolt, and a nut 33 supported by a stepped portion 32 is screwed onto the upper end, and a washer 34 is arranged on the lower surface side of this stepped portion 32! are doing. The circumferential length of the slide hole 30 is set so that centering can be performed when connecting the submerged nozzle C and the lower fixing plate 55. The submerged nozzle C is configured to be at the position of the connection core when it comes into contact with one end of the nozzle 30 and becomes unable to rotate.

The other configurations are the same as those described above, and the immersion nozzle C
can be connected to the lower fixing plate 55 with a constant pressure force.

When the immersion nozzle C is to be replaced or repaired by disconnecting the connection, the immersion nozzle C can be shifted to a position away from the axial position of the sliding nozzle B by rotating the bracket 2 around the guide 4.

FIG. 9 is a cross-sectional view of a main part showing another configuration that allows the bracket 2 to rotate.This is a cross-sectional view of a main part showing another configuration that allows the bracket 2 to rotate. It is made slidable within the moving groove 35.

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

Furthermore, FIG. 10 is a sectional view of a main part showing another example, in which a circular hollow part 37 is formed on the lower surface of the opening/closing metal frame 54, and the upper end of the guide 4 is supported in this hollow part 37, as in the above example. 38 is rotatably housed, and a stomper pin 39 for centering and positioning is provided on the lower surface of the opening/closing metal frame 54 in the same way as described above.

In this example, when connecting the submerged nozzle C, the guide 4 rotates to connect the nozzle C to 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 bodies is different, and the guide 4 has a screw rod 5.
An annular hollow section 40 is provided coaxially with the coil spring 40, and double coil springs 41 and 42 are housed within the annular hollow section 40. At the lower ends of both coil springs 41 and 42, pressing bodies 21 that apply elastic reaction force to the biasing plate 6 are arranged at a plurality of positions. Similarly, it is possible to apply an acting force in the sealing direction.

In the above embodiment, the nozzle holding device is arranged on the opening/closing metal frame 54 of the sliding nozzle B, but it is also possible to arrange the nozzle holding device on the sliding metal frame of a two-piece sliding nozzle or a type that does not use a sliding nozzle. It can also be placed in the container shell.

In addition, in the embodiment, the immersion nozzle C is attached to the lower fixed plate 55.
Although the configuration is shown in which a submerged nozzle is attached to the lower fixing plate 55, a submerged nozzle may be attached to the lower fixing plate 55 via the lower nozzle.Furthermore, the present invention is not limited to the submerged nozzle, and can also be used to replace 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.

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

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

[31) (2) above eliminates the need for retightening during operation, prevents air intake, and extends the life of the refractory.

The quality and yield of rope can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part of the nozzle holding device of the present invention placed at the bottom of the sliding nozzle (as viewed from the line 1-1 in Fig. 2), Fig. 2 is a bottom view of the same, and Fig. 3 is an exploded view of the holding device. Perspective view,
Figure 4 is a cross-sectional view taken along line n-n in Figure 2, Figure 5 is a cross-sectional view of the main part before the nozzle is installed, Figure 6 is a cross-sectional view showing the state before energizing, and Figure 7 shows the bracket. FIG. 8 is a perspective view of the upper end portion of the guide in FIG. 7; FIGS. 9 and 1θ are sectional views of essential parts showing a structure in which the guide is pivotable; FIG. 11 is a sectional view of a main part when a double coil spring is used as an elastic body. (1) Hanger 12) Fracket (4)
Guide (5) Screw rod (6) Biasing plate
(12) Fitting part (13) Hollow part (14) Retaining hole (15) Bush (16) Retaining pin (17) Connection shaft (19) Block (20) Coil spring (elastic body) (A) Tandish ( B) Sliding nozzle (C) Immersed nozzle (D) Nozzle holding device (E) Nozzle holding ring Patent applicant Kawasaki Steel Corporation (1 person) Agent Small
Masu Hori (1 person) Figure 1 Figure 2 Cause 3 Figure 4 @ Figure 5 m6 Figure 7 Cause 8 Whistle 9 Figure 11

Claims (1)

[Claims] 1. An arm having a hanger formed at one end to hold a nozzle for connecting the molten metal container, and extending downward from the bottom surface of the molten metal container and inserting the other end of the arm to support the arm so that it can be raised and lowered. a guide, a biasing plate located on the lower surface of the guide and connected to the arm so as to be movable up and down; the biasing plate is inserted through the biasing plate and screwed together in the extension direction of the guide, so that the biasing plate can be movable up and down on the guide; A nozzle holding device for a molten metal container, comprising: a screw rod connected to the arm; and an elastic body built into the guide insertion side of the arm and applying an elastic reaction force downward to the biasing plate.