JP2708700B2 - Oxygen cleaning equipment for molten metal containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen cleaning apparatus for a molten metal container such as a ladle and a tundish.

[0002]

2. Description of the Related Art A molten metal container 1 such as a ladle or a tundish has a nozzle outlet 3 opened in a nozzle brick 2 at a bottom 1a, as shown in a partial cross section in FIG. 4 is inserted from the lower surface side, and the hole 7 of the bottom plate 6 of the slide valve 5 mounted on the lower surface of the molten metal container 1
The lower end of the insert nozzle 4 is fitted to and supported by a convex part around the slide plate 9. The slide plate 9 is slid by the hydraulic cylinder 8 of the slide valve 5 to form the hole 10 and the hole 7 of the bottom plate 6. The mate and non-mate are controlled to open and close.

[0003] In such a molten metal container 1, after tapping, metal remains on the inner surface of the bottom 1a of the container, the inner surface of the tapping hole 3, and the inner surface of the insert nozzle 4. The base metal is melted, flows into the insert nozzle 4, and solidifies in the nozzle. In the case of replacing the insert nozzle 4 with a new one, when the metal that has flowed in clogs the gas injection porous of the insert nozzle 4 or when the nozzle brick 2 is worn out and repaired by a repairable castable, If metal is attached to the damaged portion of the inner peripheral surface of the steel mouth 3, repair by castable cannot be performed.

[0004] Therefore, oxygen cleaning is performed by inserting an oxygen cleaning pipe into the insert nozzle 4 to melt and perforate the solidified metal in the nozzle, and then dissolving and removing the residual metal.

[0005]

However, the oxygen cleaning pipe used in the conventional oxygen cleaning apparatus is made of a steel pipe. When the metal in the nozzle is melted and drilled, the cleaning pipe also burns. The cleaning pipe is melted by the time the metal in the nozzle is completely penetrated, so that the length of the cleaning pipe is shortened and the useful life of the cleaning pipe is lost at an early stage. In addition, if the length of the cleaning pipe is extended and the cleaning pipe is fed out by a mechanical means to perform cleaning, a problem arises in that accurate control becomes difficult because the tip position of the cleaning pipe changes. there were.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an oxygen cleaning apparatus capable of minimizing changes in length and outer diameter due to erosion of a cleaning pipe and enabling long-term use.

[0007]

As a means for solving the problems of the above-mentioned prior art, the present invention provides an oxygen cleaning apparatus for cleaning an object to be cleaned such as a base metal adhered to a molten metal container side with oxygen. 2. The method according to claim 1, wherein a tip of the oxygen-cleaning pipe for oxygen-cleaning the object to be cleaned is a ceramic pipe, and a steel pipe used until drilling the workpiece is connected to the tip of the ceramic pipe. An apparatus configuration capable of using the washing pipe more effectively is claimed in claim 2.

[0008]

[Action] After putting an igniting material (iron powder, Dalai powder, etc.) at the end of the cleaning pipe, insert the cleaning pipe into the nozzle of the molten metal container, and the solid object to be cleaned which remains inside is solidified. (Substrate) and supply a small amount of oxygen to ignite the object to be cleaned (natural ignition by residual heat). After ignition, the supply amount of oxygen is increased to make a hole penetrating to the opposite surface of the molten metal container, and then a large amount of oxygen is supplied after the penetration to perform internal cleaning. At the time of the above washing, since the steel pipe is connected to the ceramic pipe at the tip of the washing pipe, the process is performed by the steel pipe until the metal in the nozzle is melted and drilled. Although the pipes almost disappear, the inner pipes are cleaned by the ceramic pipes which are not changed in the length direction at the time of internal cleaning after the perforation, and the consumption of the ceramic pipes is almost zero.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a side view of a preferred embodiment for carrying out the present invention, and FIG. 2 shows the same plane. 15 is provided rotatably in a horizontal plane via a bearing 16. A guide supporter 19 having guide rollers 18, 18... It is supported so that it can be freely raised.

A slide pipe 21 having a rectangular outer shape is inserted through the guide supporter 19 and slidably supported by the guide rollers 18, 18,..., And a cleaning pipe 22 is inserted through the slide pipe 21. In addition, the cleaning pipe 22 can be fixed to the slide pipe 21 at an arbitrary position by the chuck 23 at the front end of the slide pipe 21. When there is no need to turn or lie down, the guide supporter 19 serves as a support.
The cleaning pipe 22 is movably supported by a member corresponding to.

A rack rod 24 is disposed below the slide pipe 21, and guide rods 25 projecting from the front and rear ends of the rack rod 24 are fixed to the lower surfaces of the slide pipe 21 at the front and rear portions thereof. 27, a spring 28 is provided between the front end of the rack rod 24 and the front guide block 26 as urging means. The spring 28 does not contract when transmitting the movement of the rack rod 24 to the slide pipe 21.

The rack teeth 24a on the lower surface of the rack rod 24
Is engaged with a pinion 29 pivotally supported by the gantry 17, and the pinion 29 is provided with rotation from a motor 30 on the gantry 17 via a chain 31.
The rack rod 24 is moved by the rotation of the pinion 29, and the slide pipe 21 moves forward via the spring 28.

The rack rod 24 is provided with a limit switch operating dog 32. When the rack rod 24 reaches a predetermined position, the limit switch S is operated to stop the motor 30.

As shown in FIG. 4, the cleaning pipe 22 comprises a steel pipe 22a forming a base, a ceramic pipe 34 connected to a distal end of the steel pipe 22a through a joint 33, and This ceramic pipe 3
4 and a steel pipe 36 connected to the distal end of the pipe 4. Reference numeral 37 denotes an ignition material.

The constituent materials of the ceramic pipe 34 include nitride ceramics such as Si ₃ N ₄ (silicon nitride), Sialon and BN, boride ceramics such as ZrB ₂ and TiB ₂ , SiC, Cr ₂ C _{3 and the} like. Carbide ceramics, oxide ceramics such as ZrO ₂ and Al ₂ O ₃ , and composite ceramics of the above ceramics can be used.

The pipe 36 made of steel pipe is covered with a ceramic pipe 34 at the end of the cleaning pipe 22 when the object to be cleaned 35 (metal) is pierced in the nozzle at the beginning of the oxygen cleaning operation. When pressed against and melted by the cleaning object 35, the tip of the pipe and the outer peripheral surface are inevitably worn, so that the nozzle 4 has a sustainable length until it is completely pierced through the cleaning object 35 in the nozzle 4. Until the drilling is completed, the tip of the steel pipe 36 is pressed against the object 35 to be burned and burns. At the completion of the drilling, the steel pipe 36 is completely melted and the position of the cleaning pipe 22 is determined. After that, oxygen cleaning is performed by a ceramic pipe 34. According to this, at the time of perforation with the most consumption, that is, when the molten metal blows out to the near side and scatters around the cleaning pipe, the pipe 36 made of steel as a consumable is received, and when the above-mentioned blowout disappears after penetration. In this case, since the cleaning is performed by the ceramic pipe 34, the consumption of the ceramic pipe 34 can be maintained at almost zero.

In the embodiment shown in the drawings, the guide supporter 19 and the turning table 15 can be automatically turned.

As shown in FIG. 1, a support mechanism 40 for supporting and lowering the guide supporter 19 has a stand 41 erected on the swivel 15 at a position behind the center of rotation of the swivel 15 as shown in FIG. A screw jack 42 is swingably supported above the stand 41, and a lower end of a screw 43 of the screw jack 42 is connected to a support 44 of the guide supporter 19 by a pin. The screw jack 42 is driven to rotate by a servomotor 45 supported by the screw jack 42. The forward / reverse rotation of the servomotor 45 causes the screw 43 to move up and down, and the guide supporter 19 to move the tilting shaft 20 The fulcrum is turned up and down.

As shown in FIG. 2, a screw jack 47 is swingably supported by a screw jack supporting portion 46 of the carriage 14, and one end of a screw 48 of the screw jack 47 is turned. Stand 15
The screw jack 47 is rotatably driven by a servo motor 50 mounted on the screw jack 40. The screw jack 47 is rotated by forward and reverse rotation of the servo motor 50. 48 moves forward and backward, and the turntable 15 is turned.

An oxygen supply hose 51 communicating with an oxygen supply source is connected to the rear end of the cleaning pipe 22.

Next, the operation of the above embodiment will be described.

After an igniting material 37 such as iron powder or Dalai powder is put into the end of the cleaning pipe 22, the motor 3 is moved from the state shown in FIG.
When the rack rod 24 is advanced by driving the pinion 29 by driving 0, the tip of the rack rod 24 advances the slide pipe 21 via the spring 28. As a result, the tip of the steel pipe 36 connected to the tip of the ceramic pipe 34 is pressed against the cleaning object 35 (metal) remaining and solidified in the nozzle. Further, the rotation of the pinion 29 causes the rack rod 24 to move forward.
1 does not move forward, the difference is absorbed by the compression of the spring 28, and the dog 32 of the rack rod 24 operates the limit switch S to stop the motor 30 with the compression of the spring 28, and the cleaning pipe 22 is cleaned. The object 35 is pressed with an appropriate pressing force.

Next, a small amount of oxygen is supplied, and the object to be cleaned 35 is ignited by burning the ignition material 37.

When the washing pipe 22 is inserted, the horizontal adjustment of the washing pipe 22 is performed by rotating the screw jack 47 by rotating the servomotor 50 by a required number of pulses and moving the screw 48 forward and backward to rotate the rotary table 15. By turning. Adjustment in the vertical direction is performed by rotating the screw jack 42 by rotating the servo motor 45 by a required number of pulses, moving the screw 43 up and down, and lowering the guide supporter 19 about the tilt shaft 20 as a fulcrum.

After igniting the object 35 to be cleaned, the oxygen supply amount is increased, and a hole is formed to penetrate to the opposite surface of the molten metal container 1. After penetrating the hole, a large amount of oxygen is supplied to clean the entire inside of the nozzle. Similarly, the inner surface of the bottom 1a can be cleaned. At this time, the steel pipe 36 at the end of the ceramic pipe 34 presses against the object 35 to be cleaned and then penetrates until the steel pipe 36 penetrates the front end of the cleaning pipe 22, causing erosion. The pipe 36 made of steel pipe contacts the object 35 to be cleaned while penetrating while burning (burning). After the penetration, the steel pipe 36 is substantially melted, and thereafter the oxygen is cleaned by the ceramic pipe 34.

In the illustrated embodiment, the cleaning is performed from the inside of the molten metal container 1. However, the cleaning may be performed from the nozzle side. A turning mechanism of the turning table 15;
The mechanism for raising and lowering the guide supporter 19, the mechanism for moving the slide pipe 21 forward and backward, and the like are not limited to the illustrated embodiment, but can be replaced with other alternative means.

[0028]

As described above, according to the present invention, the tip of the cleaning pipe is formed of a ceramic pipe, and the consumable steel pipe is connected to the tip of the ceramic pipe. The ceramic pipe does not directly push the object to be cleaned at the time of drilling, and the ceramic pipe is washed by the ceramic pipe at the same time when the drilling is completed due to the erosion of the steel pipe, so that the consumption of the ceramic pipe can be prevented. Also, even if molten metal blows out when the object to be cleaned is pierced during oxygen cleaning, the tip and outer periphery of the tip pipe are not consumed and can be used for a long time, so that the tip position does not change, so mechanization is possible. There is no bearing on the control when doing it.

[0029]

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an oxygen cleaning apparatus according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a view taken in the direction of arrow A in FIG. 1;

FIG. 4 is a sectional view of a distal end portion of a cleaning pipe.

FIG. 5 is a partial cross-sectional view showing an example of a molten metal container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal container 3 Steel tapping port 4 Insert nozzle 5 Slide valve 11 Oxygen cleaning device 14 Dolly 15 Turning table 19 Guide supporter 20 Tilt axis 21 Slide pipe 22 Cleaning pipe 24 Rack rod 28 Spring 29 Pinion 30 Motor 34 Ceramic pipe 36 Steel pipe 40 support mechanism 41 stand 42,47 screw jack 43,48 screw 45,50 servo motor

Claims (2)

(57) [Claims] 1. An oxygen cleaning apparatus for cleaning an object to be cleaned such as a metal stick attached to a molten metal container with oxygen, wherein a tip of an oxygen cleaning pipe for performing oxygen cleaning of the object to be cleaned is a ceramic pipe. An oxygen scrubber for a molten metal container, wherein a steel pipe used until a hole is drilled in an object to be cleaned is connected to a tip of the pipe. 2. An urging means for supporting the oxygen cleaning pipe movably forward and backward on a support portion, and for urging the cleaning pipe forward between the cleaning pipe and the support base,
The oxygen for a molten metal container according to claim 1, wherein the tip of the cleaning pipe is pressed against the object to be cleaned by the urging means after the tip of the cleaning pipe contacts the object to be cleaned. Cleaning equipment.