WO1989008811A1

WO1989008811A1 - Radiation construction method for molten metal outflow port, its apparatus and recess radiating impeller used for said apparatus

Info

Publication number: WO1989008811A1
Application number: PCT/JP1989/000247
Authority: WO
Inventors: Masayuki Fujita; Sueki Kubo; Hiroyuki Ito
Original assignee: Kurosaki Refractories Co., Ltd.
Priority date: 1988-03-17
Filing date: 1989-03-08
Publication date: 1989-09-21
Also published as: DE68916344D1; EP0357795B1; EP0357795A4; EP0357795A1; JP2683807B2; JPH01240612A; DE68916344T2

Abstract

This invention relates to a method of constructing and shaping a converter steel tapping port incorporating therein a refractory material and a molten metal outflow port of a vacuum degassing furnace, etc., or method of repairing the breakage of said ports, to an apparatus for the method and to an impeller used for the apparatus. A material transferred via a material feed pipe from the downstream side of an impeller driven for rotation is discharged and caused to impinge against the impeller rotating at a high speed so that the material can be radiated in a circumferential direction and a compact refractory layer or a repair layer can be formed. Furthermore, partial repair can be made by supplying eccentrically the radiation material from the material feed pipe, and shaping of the molten metal outflow port can be made by fitting a cutter to the impeller.

Description

Description Molten metal outlet projection method and device, and impeller for projecting recesses used in the device

"Technical field"

The present invention relates to a method and an apparatus for projecting a molten metal outlet such as a converter outlet hole, a vacuum degassing furnace, and the like, and a concave metal impeller for use in the apparatus, and the molten metal outlet by projection. It can be used for repair, construction, molding, etc.

"Background technology"

For example, the converter outlet, which is an example of a molten metal outlet, is covered with a refractory material and the internal refractory is damaged or melted down by use, so it needs to be repaired. Methods for performing this repair hot include a press-fit repair method, a spray repair method, and a projection repair method. The press-in repair method is a method of filling a cylinder with a fluid repair material and extruding it with a viston, so that the inner cone-shaped erosion part (wrapper-shaped erosion) of the converter outlet hole is used. However, even if the repair material adhered to the portion, the construction of the repaired portion with a dense and good structure could not be obtained.

The above-mentioned spray repair method is a method in which the repair material is conveyed with compressed air and the repair material is sprayed from the spray outlet of the spray lance to the part to be repaired. If a sufficient distance cannot be secured to the inner wall of the silk hole, the adhesion rate of the repair material is poor due to the effect of compressed air for transporting the repair material, There was a problem that the organization was bad.

In addition, in the above-mentioned spray repair method, the spray discharge port 11 is attached to the spray lance 12 for the cone erosion portion 10 inside the converter outlet hole as shown in FIG. When the flow is formed so as to change the course at an acute angle (0 is less than 90 degrees), the repair material will be clogged in the bent parts of the spray lance 12 and the spray outlet 11 and spraying will not be possible. There was a problem.

In addition, the above-mentioned projection repair method uses the repair equipment for degassing equipment for molten metal described in Japanese Utility Model Registration No. 14432690 (described in Japanese Utility Model Publication No. 56-325151). Means for repairing the converter outlet are conceivable, but as shown in FIG. 12, the repair device 17 described in the above-mentioned publication is equipped with a rotary pipe at the lower center of the impeller 18 that is driven by rotation. A vertical pipe 19 connected to the rotating pipe 19a and the rotating pipe 19a is provided, a refractory material is supplied from the vertical pipe 19, and the refractory material is jetted from the west of the impeller 18. Was.

However, in the above-mentioned repair device 17 for the degassing device for molten metal, fireproof material is supplied from the central vertical tube 19 to the rotating tube 19a connected to the center of the impeller. There was a problem that the refractory material was released only by the centrifugal force caused by the impeller turning to the left, and the release speed was not sufficient.

Also, since the material can be discharged only in the direction perpendicular to the rotation axis of the impeller, and it is difficult to inject the material perpendicularly to the inclined cone-shaped erosion part, The problem is that they cannot be obtained.

Furthermore, the refractory material is jetted out uniformly in the radial direction, It is difficult to eject the pyrotechnic material, so it is difficult to efficiently repair the eroded portion generated only in a part of the converter outlet hole, and to remove the molten metal described in the above publication. The gas device repair device 17 has a problem in that the material may be clogged at the joint between the rotating pipe 19a and the impeller 18 and the function may not be achieved.

The present invention has been made in view of such circumstances, and has been made to increase the adhesive force by increasing the material projection speed, and in some cases, it is possible to efficiently repair a molten metal outlet that is unevenly or locally melted. Projectile materials (including refractory materials and other repair materials) can be ejected only in some directions, and furthermore, cone-shaped erosion spots formed on the inner wall of the converter outlet hole

Provided is a method and apparatus for projecting a molten metal outlet having high adhesion to (a concave part of a molten metal outlet) and capable of projecting a fine structure, and an impeller for projecting a concave part used in the apparatus. The purpose is to:

"Disclosure of the invention"

In order to achieve the above object, a method for projecting and projecting a molten metal outlet according to the present invention comprises the steps of: 镕 disposing an impeller connected to a rotary power source in the molten metal outlet so as to be able to advance and retreat, and using air or a pump in front of the impeller. The impeller is provided with a material supply pipe for supplying a projection material, and the projection material discharged from the material supply pipe is changed in course by the impeller and projected to a concave portion of the molten metal outlet. I have.

According to the method of the present invention, it is possible to project the projected material discharged from the material supply pipe near the circumferential direction by the impeller, and to perform high-speed projection of the material by increasing the rotation of the impeller. Thus, a dense construction body can be formed, and projection can be performed. When the forest material is transported by air, the air can pass through the gaps between the impeller blades, so that the projection material and the transport air can be separated.

Further, a molten metal outflow and projection apparatus according to a first invention embodying the above method, comprises: an impeller connected to a rotating shaft; and a projection material arranged and conveyed in front of the impeller. It comprises a stationary material supply pipe having a ring-shaped discharge port for discharging, and a reciprocating device for reciprocating with respect to a molten metal outflow port where these are to be constructed.

The molten metal outlet projection construction apparatus according to the second invention that embodies the above method includes: an impeller connected to a rotating shaft; and a projection material having an outlet disposed in front of the impeller and conveyed. It comprises a material supply pipe composed of two or more pipes arranged around the rotating shaft for discharging, and a reciprocating device for reciprocating with respect to a molten metal outlet for constructing these pipes.

Here, in the molten metal outlet projection construction apparatus according to the first or second aspect of the present invention, a recess may be formed on the front side of the impeller, and the tip of each material supply pipe may be fitted into the recess. It is possible to ensure that the impeller can project the material from the radial direction to the circumferential direction even when the emission speed of the projection material is low. Further, in the molten metal outlet projection apparatus according to the first or second invention, it is possible to provide a cutter at the tip of the impeller so that the cutter rotates simultaneously with the impeller. As a result, the protrusions and the like made of slag and the like adhered inside can be scraped off and the molten metal outlet can be formed into a cylindrical shape. Each impeller blade of the impeller used in the molten metal outlet projection apparatus according to the first or second invention is attached with a constant twist angle with respect to the rotation axis, and is fed from the material supply pipe. It is also possible to configure so that the projected material is projected in the rearward oblique direction. As a result, the projection material can be supplied to the cone-shaped erosion portion inside the molten metal outlet, that is, the concave portion of the molten metal outlet near a right angle, and a high-quality construction body can be obtained.

"Brief description of the drawings"

FIG. 1 is a side view showing an embodiment of a molten metal outlet projecting apparatus according to a first embodiment of the present invention, FIG. 2 is a schematic sectional view showing a main configuration of the molten metal outlet repair apparatus, FIG. 3 is a schematic side view of a molten metal outlet repairing apparatus according to a second embodiment of the present invention, FIG. 4 is a schematic enlarged cross-sectional view taken along a line A-A in FIG. 3, and FIG. FIG. 6 is a partially omitted cross-sectional view of a main part of the molten metal outlet repair device according to the third embodiment, FIG. 6 is a cross-sectional view taken along the line BB in FIG. 5, and FIG. FIG. 8 is a schematic side view of a molten metal outlet projection construction apparatus according to an embodiment, FIG. 8 is a front view of a cutter used in the fourth embodiment, FIG. 9 is a side view thereof, and FIG. FIG. 11 is a perspective view of an impeller according to another embodiment used for a metal outlet projection device, FIG. 11 is a schematic side view showing a molten metal outlet repair method according to a conventional example, FIG. 12 is a sectional view of a repair device using a conventional impeller.

"Best mode for carrying out the invention"

As shown in FIG. 1 and FIG. 2, the molten metal outlet repairing device 21 according to the first embodiment is disposed at the front of a converter steel outlet hole, which is an example of the molten metal outlet, not shown. The retreating device 22 supported by the support member 2 2 A traveling platform 2 2a that forms a frame, a traveling platform 2 3 having a driving source inside and moving the traveling platform 2 2 .a in the lateral direction, and a support forest under the traveling platform 2 3 A rotating shaft 24 that is freely rotatable through the shaft, an impeller 25 that is mounted at the tip of the rotating shaft 24, and a material supply tube 26 that is formed around the rotating shaft 24. It is configured. Hereinafter, these will be described in detail.

The reciprocating device 22 has a well-known structure as shown in FIG. 1, and is supported by a supporting member (not shown) by an electric motor, a hydraulic or pneumatic cylinder, or the like. The traveling carriage 23 moves back and forth in parallel with the converter outlet hole 27 along the axis. Here, the traveling carriage 23 has a structure in which it only moves forward and backward, but it is also possible to add a lateral movement function or a turning function of a known structure to the converter if necessary.

A rotating shaft 24 is disposed at a lower portion of the traveling coach 23 via a support member, and an impeller 25 is attached to a tip of the rotating shaft 24. The device is adapted to move back and forth in the converter tapping hole 27.

The impeller 25 is made of metal or ceramic blades, and a rotary shaft 24 is fixed to the center of the impeller 25 as shown in FIG. 2, and a rear end of the rotary shaft 24 is provided. Is connected to a rotation motor 32 as a rotation drive source via a coupling 31 so as to rotate the impeller 25 at high speed.

The rotary shaft 24 is provided with bearings 28, 29.30 on the way, and the bearings 28, 29, 30 are fixed in a support pipe 26a. An outer cylinder supported by a support member (not shown) A pipe 26 b is provided, and a ring-shaped material supply pipe 26 formed concentrically with the rotation shaft 24 by the outer tube 26 b and the support pipe 26 a is configured. Then, the repair material, which is an example of the projection material, is discharged from the ring-shaped discharge portion 26c at the tip of the impeller 25.

The starting end of the material supply pipe 26 is connected to a material supply hose 34 connected to a material tank 33 as shown in FIG. 1, and a repair material transported by compressed air generated by a compressor (not shown) is connected to the material supply hose 34. The material is supplied from a ring-shaped discharge portion 26c at the tip of the material supply pipe 26. Here, in the middle of the material supply hose 34, a water addition device 35 having a water spout formed obliquely in the material advancing direction is arranged around the material supply hose 34, and appropriate water is added to the repair material. Can now be used.

In addition, as another example, the water addition device 35 may be configured to be attached to the end of the outer tube 26 b. In the figure, reference numeral 36 denotes a reciprocating cooling water hose (not shown in FIG. 2) for circulating cooling water for cooling the material supply pipe 26, and 37 denotes a water addition device 35. The hose that supplies water to the tube, and 38 indicates the inner cone-shaped erosion to be repaired.

Since the molten metal outlet repairing device 21 according to the first embodiment is configured as described above, before use, the state of melting of the steel outlet hole 27 in the converter is checked in advance. After circulating the cooling water necessary for the device 21, while the rotary motor 32 is being driven, the traveling carriage 23 is controlled to drive the impeller 25 and the material supply pipe 26 together with the converter outlet hole. 2 Insert into 7. Next, the repair material in the material tank 33 is supplied by compressed air from the material supply hose 34 by driving a not-shown compressor or the like. The material is transported into the pipe 26 and discharged toward the impeller 25 from the ring-shaped discharge port 26 c at the tip of the material supply pipe 26. Here, as the repair material, for example, a magnesium-based or dolomite-based basic material is used, and it is assumed that an appropriate amount of water is mixed in by a water adding device 35 on the way.

The repair material supplied to the impeller 25 is projected outward by the impeller because the impeller 15 is rotating at a high speed, thereby repairing the converter outlet hole 27 as shown in FIG. Also, the projection speed is high and the projection is almost perpendicular to the repaired surface, and it is possible to obtain a denser construction body under favorable conditions than before.

Here, in the above embodiment (the same applies to the following second to fourth embodiments), a dry repair material is used. However, for example, a wet material supplied by a pump or the like (for example, the above magnesia And dolomite-based basic materials to which water, etc. are added). Furthermore, the impeller is made up of plate-like blades and is open at the tip.Most of the compressed air for transport flows in the axial direction, and only the repair material is projected by the blades, improving the adhesion rate of the repair material. As a result, clogging of the material at the root of the blade as in the conventional example described above is eliminated.

In addition, the outer tube 26 b constituting the material supply tube 26 is disposed eccentrically with respect to the support pipe 26 a supporting the impeller shaft 24, so that it can be rotated appropriately. The projection material is eccentrically discharged from the ring-shaped discharge portion 26 c by changing the heat flow to the molten metal outlet 27, and the projection from the impeller 25 is deflected in one direction only. In this way, it is possible to adjust the thickness of the layer in the circumferential direction, and it is also possible to repair a local concave portion. You.

At this time, the material supply pipe is rotatable with respect to the traveling vehicle, and the projection position is controlled.However, since the material supply pipe does not rotate simultaneously with the impeller, the material supply pipe is in a stationary state based on the impeller. Become.

Next, the molten metal outlet repair device 39 according to the second embodiment shown in FIGS. 3 and 4 will be described. The same components as those of the molten metal outlet repair device 21 are the same. A number is attached and the explanation is omitted.

As shown in FIGS. 3 and 4, in the molten metal outlet repair device 39, a material supply pipe 40a to 40h composed of two or more pipes (8 in this embodiment). Are arranged around the rotating shaft 24, and the respective material supply pipes 40a to 40h are connected to the centralized material supply pipe 42 via valves 41a to 41h, respectively. ing. It is assumed that the centralized material supply pipe 42 is connected to the material tank as described above, and a repair material, which is an example of a predetermined blast material, is pneumatically transported.

Therefore, as shown in FIG. 4, when there is a partially eroded portion 43 only in one direction of the converter outlet hole 27, the valves 41a to 41h are controlled to control the material supply pipe 40. If the repair material is discharged only from the material supply pipe b and the material supply pipe 40c, only the material that collides with the impeller 25 from the material supply port at the tip becomes only one part. The material is projected in a concentrated manner on the right side shaded area). As a result, the converter tap hole 27 can be partially repaired.

In this embodiment, the repair material is appropriately added with water in advance and pneumatically transported by compressed air generated from a compressor, as in the first embodiment (not shown). ~ Four It is also possible to provide a water adding device for adding an appropriate amount of water to the repair material as described above in the middle of or before 0 h.

Next, the main configuration of the molten metal outlet projection apparatus according to the third embodiment shown in FIGS. 5 and 6 will be described. A support pipe 44 that is sufficiently longer than the length of the converter outlet hole described above. A rotating shaft 48 is disposed rotatably via bearings 45, 46, and 47, and an impeller 9 is fixed to a tip of the rotating shaft 48.

As shown in FIG. 6, around the support pipe 44, a material made of four stainless steel tubes ^ H co-supply tubes 50a to 50d are held at both ends by ends 51 and 52. Cooling water supply pipes 53a to 53d are arranged in an intermediate portion adjacent to the material supply pipes 50a to 50d. An outer tube 54 is disposed outside the material supply tubes 50a to 50d, the front end of which holds the end plate 51, and the rear end of which holds the end plate 52. It is fixed to the support bracket 55.

The support bracket 55 is provided with a water supply port 56 and a water discharge port 57, and the water outlet is connected to the four cooling water supply pipes 53a to 53d. 7 is connected to the inside of the outer tube 54 and supports the water sent to the front of the material supply tubes 50a to 50d by the supply tubes 53a to 53d and the pipe 44. The water is discharged to the outside from the water discharge port 57 through the gap with the outer cylinder No. 54. Here, FIG. 5 shows a state in which cooling water is not flowing, and FIG. 6 shows a state in which cooling water is flowing.The starting end of each of the material supply pipes 50a to 50d is compressed air. A fitting 58 for a material supply hose that transports the repair forestry material, which is an example of the projection material conveyed by this, is provided, and the connecting fitting 58 has insufficient pressure. An air supply port 59 for supplying compressed air and a water supply port 60 for supplying water required for the repair material are provided. A valve is provided in each of the material supply hoses so that the supply of the repair material to the material supply pipes 50a to 50d can be independently stopped.

One end of the rotary shaft 48 is provided with a power coupling 60a for connecting to an output shaft of a rotary drive source (not shown) (for example, an electric motor, a hydraulic motor, or an air motor). The impeller 49 fixed to the other end side has a concave portion 61 formed on the near side. The tip of the above-described material supply pipe 50a to 50d is fitted into the recess 61, and the released repair material always hits the impeller 49 and is projected around the circumference from the radial direction to the circumferential direction. It has become so.

The support bracket 55 is attached to a traveling vehicle 23 constituting the above-mentioned reciprocating device 22, and the device reciprocates inside the converter outlet hole 27 by the movement of the traveling vehicle 23. It has become.

Therefore, when using this molten metal outlet projection equipment, check the meltdown status of the converter outlet hole 27 to be repaired in advance, and then add a predetermined amount of water to the water supply port 56. To keep the inside in a sufficiently cooled state, drive the retraction device 22 and insert it into the converter outlet hole 27 to be repaired to a predetermined position, and drive the rotary motor to drive the impeller 4 While rotating 9, the specified valve connected to the material supply pipes 50a to 50d is opened, and the repair material is supplied with compressed air by any of the material supply pipes 50a to 50d. Or transport to all.

Here, an appropriate amount of water is added to the repair material from the water supply port 60 and humidified.If necessary, compressed air is supplied from the air supply port 59 to supply the repair material. Can be further accelerated to supply the impeller 49 blades.

Here, the repair material discharged from each of the material supply pipes 50a to 50d is fitted into the recess 61 of the impeller 49 because the tip of the material supply pipe 50a to 50d fits into the recess 61 of the impeller 49. Even if the released repair material does not have a sufficient speed, if it is released, it will always be projected to the surroundings by the impeller 49, and the repair work can be performed efficiently. Note that, in this embodiment, a case where a plurality of material supply pipes 50a to 50d surrounding the rotation shaft are provided has been described.However, as shown in the first embodiment, the support pipe 26a is Even in the case of the material supply tube 26 formed by the outer tube 26 b, it is possible to fit the tip of the material supply tube 26 into the upper concave portion 61, whereby the repair material supplied is provided. It has the characteristic that projection can be performed sufficiently with an impeller even when the emission speed is low.

Next, the basic difference between the molten metal outlet repair device 62 and the molten metal outlet repair device 62 according to the fourth embodiment shown in FIGS. 7 to 9 will be described. As for the repairing device 62, a force cutter 64 as shown in FIGS. 8 and 9 is provided at the front end of the impeller 63 so as to be freely attached and detached. Therefore, the cutter 64 rotates with the rotation of the impeller 63, whereby the protrusions 65, 66 in the converter outlet hole 27 can be removed before the repair, and further, an example of the projection material Even if the repair material is excessively projected in one direction, the cutter 64 can scrape the repair material.

Next, referring to FIG. 10, in the above molten metal outlet projection construction apparatus, each impeller blade 67 is moved with respect to a rotation axis (not shown). The impeller 68 is twisted by an angle and mounted at an angle r in the direction of the radius of rotation. The impeller blades 6 7 are twisted with respect to the rotating shaft for mounting. The repair material, which is an example of the projectile material blown from the material supply pipe 69 toward the impeller 68, can be projected obliquely rearward as shown by the arrow P, and its blades are rotated in the radial direction of rotation. By mounting the repair material at an angle with respect to, it is possible to project the repair material at an angle closer to the rotation axis direction. Therefore, when repairing the inner cone-shaped eroded portion 38 of the converter as shown in FIG. 2, the impeller 68 is disposed slightly forward of the eroded portion and the repair material is projected onto the eroded portion. The material is projected obliquely rearward, which enables extremely efficient projection.

In the above embodiment, repair of the inside of the converter outlet was described as an example, but the concave part of the vacuum degassing furnace reflux tank, the furnace of the converter and electric furnace (insertion port), etc. There are many applicable places such as kiln parts. Furthermore, it can be used not only for repairs, but also for construction and molding of details using irregular shapes such as converters.

[Industrial applicability]

In the method for repairing a molten metal outlet according to the present invention, the projecting material supplied to the impeller through the material supply pipe collides with the impeller blades rotating at a high speed and is projected in the circumferential direction. As a result, only the projection material can be more effectively projected onto the recess of the molten metal outlet while the air or the like is passed in the direction of the rotation axis.

Therefore, even in the inner part of the molten metal outlet, which has been difficult to project the repair material according to the method of the present invention, it is efficiently hot and free of material clogging, and a high-quality construction body Can get repairs that can be obtained You.

The apparatus for performing the above-mentioned method can be provided by the molten metal outlet repairing apparatus according to the first and second inventions, and high-speed projection of the blasting material onto the inner wall of the molten metal outlet can be performed. As a result, the inner wall can be constructed with a high bulk density (low porosity).

In particular, in the molten metal outlet repairing apparatus according to the second invention, by providing a valve in each material supply pipe, the projected material to be projected can be collected in only one direction and projected. The thickness of the layer in the circumferential direction can be adjusted, and the molten metal outlet can be repaired efficiently, which also contributes to a reduction in the unit cost of repair materials. Since the molten metal outlet can be repaired to be a perfect circle, the area where the molten metal flow comes into contact with air is reduced, which has a positive effect on quality.

In the molten metal outlet projection construction apparatus according to the first or second invention, a concave portion is provided on the front side of the impeller, and the tip of the material supply pipe is fitted into the concave portion, so that the material discharge speed can be reduced. Even if it is late, the projection by the impeller is possible.

Further, in the molten metal outlet projecting apparatus according to the first and second aspects of the present invention, when a cutter is attached to the impeller, it is also possible to remove projections in the molten metal outlet or excessively projected material. It is possible to form or repair the molten metal outlet that is close to a perfect circle.

Further, in the impeller for repairing the recessed portion of the molten metal outlet of the present invention, the projected material can be projected obliquely in the rearward direction, thereby projecting the molten metal outlet into the inner cone-shaped eroded portion. Can be performed more efficiently If the impeller impeller repair of the present invention is applied to a converter outlet, it is possible to repair the molten metal outlet during blowing.

Claims

The scope of the claims

(1) An impeller connected to a rotary power source is disposed in the molten metal outlet so as to be able to advance and retreat, and a material supply pipe for supplying a projection material to the impeller by air or a pump is provided in front of the impeller. A method for projecting a molten metal outlet, characterized by projecting a ttt material discharged from a supply pipe to a concave portion of a molten metal outlet by changing a course by the impeller.

(2) An impeller connected to the rotating shaft, a stationary material supply pipe having a ring-shaped discharge port disposed in front of the impeller and discharging the conveyed projection material to the impeller, and the like. And an advancing / retreating device for moving back and forth with respect to the molten metal outlet.

(3) A material supply comprising an impeller connected to the rotating shaft, and two or more pipes arranged around the rotating shaft, which has a discharge port disposed in front of the impeller and discharges the conveyed projection material. A molten metal outlet projection construction apparatus characterized by having a pipe and an advancing / retreating device for advancing and retreating the molten metal outflow port where these are to be constructed c

(4) The molten metal outlet projection construction apparatus according to claim 2 or 3, wherein a concave portion is provided on the front side of the impeller, and the leading end of each material supply pipe is fitted into the 13 portion.

(5) A cutter is provided at the tip of the impeller and rotates simultaneously with the impeller.

(6) Impeller blades are mounted with a constant twist angle with respect to the rotation axis. An impeller for use in a molten metal outlet recess projection device, wherein the projection material sent from a material supply pipe is projected in a rearward oblique direction.