JPH11201657A - Repairing method for tapping port for metal melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing method to form a fire-resisting layer executed with high quality throughout the whole of the melt damage of a tapping port easily of a work and safely and reliably despite of inferior working environment. SOLUTION: In repair of the tapping port of a metal melting furnace, a cartridge 7 for filling made of a metal or a refractory and formed approximately in the same shape as a regular tapping port and having a filing hole formed in a pipe wall is securely arranged in a tapping port with melting loss. On the other hand a pusher mechanism is arranged outside a furnace, and through operation of the pusher mechanism, a refractory 6 for repair is pushed out in the melt lost part from the interior of the cartridge 7 through the filling hole of the pipe wall to effect filling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a tap hole of a metal melting furnace such as a cupola for melting cast iron in a foundry.

[0002]

2. Description of the Related Art A taphole is the most important part of a cupola, and its operation is greatly affected by the state of erosion at this part.

[0003] In recent cupolas, a large tap block made of a highly corrosion-resistant refractory material is used to extend the service life. However, the tap hole is affected by high-temperature molten metal or slag, and is subjected to ablation, corrosion, or the like. Damage due to multiple actions such as erosion is inevitable.

The damage is mainly caused by abrasion in the longitudinal direction, and the same erosion as the metal line in the in-furnace basin zone in the lateral direction, and the tap hole is remarkably worn in both the longitudinal and lateral directions. Becomes

[0005] Therefore, at a time when the erosion is relatively slight, a pipe for securing a regular bleed hole is inserted into the bleed hole to be repaired, and the plastic material or the patching material is manually or ranmerized to melt the outside of the pipe. The area has been filled and repairs have been made to maintain a normal tap hole.

[0006] While such repairs are repeated, the eroded portion gradually expands, and eventually the repair method cannot be sufficiently repaired, and the entire taphole block needs to be replaced.

At present, repair patterns of cupolas that are operating directly are often patched and repaired on the first and second weekends of operation, and the entire hot water block is replaced on the third weekend. Have been done. Alternatively, patching repair is performed every week until the third week, and the entire hot water supply block is replaced in the fourth week.

[0008]

Conventionally, patching repairs are generally performed using humans and / or rammers in poor working environments involving high temperatures and hard work. Under such operating conditions, the application density of the refractory material is inevitably uneven and uneven, and the quality of the applied refractory layer is limited to 70 to 80% of the normal quality.

Further, erosion is more severe near the entrance and exit.
Since the central area in the longitudinal direction is not so intense, the central area is narrow, and it is difficult to fill the repair material deeper than the central area with the construction from the near side, and it often causes defective filling points on the back side. .

[0010] Therefore, in the conventional repair method, the eroded portion tends to expand every time the repair is performed due to the problem of the quality of the construction refractory layer and the problem of insufficient filling of the deep region of the eroded portion. In the third or fourth week, the entire tap block had to be replaced.

[0011] In addition, the entire work of replacing a large block for a taphole is usually performed by an operator entering the cupola. However, the inside of the furnace is very narrow and high temperature, and the operator is required to enter the inside of the furnace. The time for entering the repair work was physically limited, and the work was inefficient and heavy work.

The present invention eliminates the above-mentioned conventional problems and makes it easy and safe to operate the tap hole erosion part not only in front of the furnace but also in the entire furnace, in spite of the poor working environment. The object of the present invention is to provide a repair method capable of forming a high-quality construction refractory layer throughout.

[0013]

SUMMARY OF THE INVENTION The present invention is directed to repairing a tap hole of a metal melting furnace, in which a molten tap hole is provided with a filling hole in a pipe wall having substantially the same size and shape as a regular tap hole. The filling cartridge provided with is installed and fixed, while a pusher mechanism is installed outside the furnace, and the pusher mechanism is operated, so that the refractory for repair is put into the eroded part from the inside of the cartridge through the filling hole of the tube wall. The present invention relates to a method for repairing a tap hole of a metal melting furnace, which is characterized by extrusion filling.

In the repair method of the present invention, after the extrusion filling of the repair material into the eroded portion is completed, the cartridge may be left in the repair portion as it is as a regular tap hole, or the cartridge may be removed from the repair portion. The extraction and the extraction trace may be used as a regular outlet. If the cartridge is to be left as a regular tap, the lid that closes the opening inside the furnace of the cartridge must be made of a material that can be removed by melting or incineration with heat during operation of the melting furnace. . The remaining cartridge is made of metal or refractory material.If it is a metal, it is melted by heat during operation, and if it is a refractory, it is melted at the time of tapping.
It will eventually disappear.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the repair method according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows the entire configuration of a basic construction method for repairing a eroded portion 4 of a taphole 2 of a cupola 1 by applying the repair method of the present invention.

As is clear from FIG. 1, the tap hole 2 of the cupola 1 initially has a normal shape and dimensions by using the tap hole block 3, but is damaged as the operation proceeds, and the erosion portion 4 is damaged. Occurs, and the eroded portion 4 expands as the operation proceeds, and eventually needs to be repaired.

Repair of the tap hole is performed in a state where the operation of the cupola 1 is stopped and the banking coke 5 (see FIG. 2) is filled in the cupola 1 as in the conventional method.

In carrying out the repair method of the present invention, a filling cartridge 7 filled with the refractory material 6 for repair and a pusher mechanism 8 for pushing out the refractory material 6 from the cartridge 7 are applied.

The cartridge 7 is made of metal (for example, made of steel) or refractory material and has substantially the same shape as the regular tap hole 2 and has a slightly longer length than the regular tap hole. A plurality of filling holes 9 (see FIG. 2) are formed in the back region of the tube wall so as to be arranged side by side at intervals in the direction around the tube. The shape of the filling hole 9 is not particularly limited, and is arbitrary such as a round shape and a slit shape.

The outside of the furnace of the filling cartridge 7 is entirely open, and the inside of the furnace is closed by a lid 10 made of, for example, wood or metal, which can be removed by melting or incineration by heat during operation of the cupola.

As the refractory material 6 for repair, various known plastic refractory materials used for this kind of application can be applied. For example, by appropriately selecting the combination of the particle size composition and the raw materials, the refillable refractory material 6 can be used in the filling cartridge 7. A plastic refractory that can be smoothly extruded and filled into the eroded portion 4 through the filling hole 9 can be obtained.

On the other hand, the pusher mechanism 8 includes a fluid pressure operating cylinder device 8a as a driving portion, and the cylinder device 8a
The push head 11 is provided at the tip of the piston rod 8b, and the tubular guide portion 8c of the push head 11 is provided at the tip of the main body of the cylinder 8a.

The pressing head 11 has an outer diameter substantially corresponding to the inner diameter of the filling cartridge 7, and
Is operated so as to be able to enter or exit the cartridge 7 in the axial direction. Further, the length in the axial direction needs to be at least larger than the length in the axial direction of the region where the filling hole 9 is formed, thereby preventing the refractory from flowing back from the filling hole 9 during the extrusion filling operation.

At the time of repairing, as shown in FIG. 2, first, a filling cartridge 7 filled with the refractory material 6 for repair is properly discharged into the tap hole 2 including the eroded portion 4 to be repaired. It is installed and fixed so as to occupy the position of the gate 2. In this installation and fixed state, the outside of the furnace of the charging cartridge 7 slightly projects outward, and forms a connection end 7 a with the pusher mechanism 8.

Further, the furnace outside of the erosion part 4 of the tap hole 2 is closed by the frame plate 12. The frame plate 12 also serves as a fixing means of the cartridge 7, and has a connection end 7 a of the cartridge 7.
Project out of the furnace through the through-hole 12a of the frame plate 12. Incidentally, the furnace inside of the erosion part 4 is substantially closed by the banking coke 5.

Next, the pusher mechanism 8 is installed in front of the furnace so that the center axis of the cylinder device 8a and the center axis of the refill cartridge 7 are aligned, and the tubular guide portion 8c is provided.
Is connected and fixed to the connection end 7a of the cartridge 7 via a suitable joint means (not shown).

Under this connection fixed state, the cylinder device 8
a to operate the pressing head 1 at the tip of the piston rod 8b.
When the cartridge 1 is advanced into the cartridge 7, as shown in FIG.
The refractory material 6 for repair inside is extruded from the back of the furnace toward the front side of the furnace through the filling hole 9 formed in the back of the pipe wall and filled into the erosion part 4, and finally in the erosion part 4. Is filled with the refractory material 6 for repair.

In this case, if an air vent hole 19 (see FIG. 2) is provided in the frame plate 12, air can be vented from the eroded portion 4 and leakage of the repairable refractory material 6 from the hole 19 can be achieved. This is convenient because it is possible to confirm the end of filling by using as a guide.

After filling the refractory material 6 for repair, the cylinder device 8a is operated to move the pressing head 11 out of the filling cartridge 7, and the cartridge 7 is left as it is at the installation fixed position. Finish the repair.

When the pressing head 11 is retracted, the head 1
1. It is necessary to take in the air to the front side, for example,
Means for taking in outside air (not shown)
Is provided. The specific configuration of the outside air intake means will be clarified in the description of FIG. 4 described below.

The repair method according to the present invention is a method in which the repairable refractory material 6 is extruded from the filling cartridge 7 into the erosion portion 4 through the filling hole 9 in the tube wall, and is filled.
On the other hand, it is possible to sufficiently reliably fill not only the front side of the furnace but also the inner part of the furnace, and a high-quality refractory layer without unevenness in density can be obtained.

Since the cartridge 7 has substantially the same size and the same shape as the regular tap 2, the regular tap can be secured by leaving the cartridge 7 as it is after construction.

The inside of the furnace of the filling cartridge 7 is closed by the lid 10 until the cupola is operated, and the lid 10 is eventually melted (made of metal) or incinerated (woody) by the heat during the operation of the cupola. ) And is opened.

Further, the remaining filling cartridge 7 disappears when it is made of metal due to melting due to heat during operation, and when it is made of refractory material, it is lost due to melting during tapping. The first embodiment shown in FIGS. 1 and 2 is limited by the fact that the volume of the repairable refractory material 6 for filling in the filling cartridge 7 must be larger than the volume of the eroded portion 4, so that the erosion is minimal. Suitable for taphole repair.

As in the embodiment shown in FIGS. 1 and 2, when the refractory material 6 for repair is pushed into the erosion part 4 through the filling hole 9 formed in the inner part of the furnace of the filling cartridge 7, Depending on the material of the refractory material and the like, the filling at the furnace front part of the erosion part 4 may become insufficient.

In such a case, after the repair is completed, the insufficient filling may be compensated for manually. This replenishment work is performed from the front side of the furnace, and the filling amount is not so large, so that the work load is small.

When the filling holes 9 are dispersedly formed in the entire tube wall of the filling cartridge 7, the filling property of the repairable refractory 6 into the eroded portion 4 can be improved. In this case, a pressing head having a length substantially the same as that of the cartridge 7 is used.

FIG. 3 shows a second embodiment of the present invention. In the present embodiment, a bent tubular guide portion 8c1 is provided between the tip of the piston rod 8b1 and the pressing head 11A.
Except for interposing a bendable rod 13 that can reciprocate inside, there is no substantial difference from the first embodiment.

As shown in FIG.
Are composed of a large number of spheres 13a and a flexible wire 13b connecting the spheres 13a in a daisy chain, and can be freely bent and deformed by the point contact between the spheres 13a and the flexibility of the wire 13b. Due to this flexibility, it is possible to freely reciprocate in the axial direction in the bent portion 8c11 of the tubular guide portion 8c1. A pressing head 11 </ b> A is provided on the distal end side of the bendable rod 13.

According to the second embodiment, the pusher mechanism 8A is provided at the linear portion 8c12 on the distal end side of the tubular guide portion 8c1 so as to be fixedly installed in the erosion portion 4.
Thus, the base straight portion 8c13 and, consequently, the cylinder device 8a1 connected to the base straight portion 8c13 can be installed in a state of extending obliquely upward.

Therefore, when a weir 1a for guiding the flow of hot water is provided in front of the hot water outlet 2 like the cupola 1, the pusher mechanism 8A can be installed avoiding the weir 1a. .

In the second embodiment, in the state shown in FIG. 3, in the state shown in FIG. 3, the cylinder head 8A1 is operated and the pressing head 11A is connected to the filling cartridge 7 via the bendable rod 13. The erosion portion 4 can be repaired as in the first embodiment by moving inward.

FIG. 4 shows the outside air intake means when the pressing head 11A is retracted. The outside air intake means includes a check valve 15 comprising a suction passage 14 and a leaf spring for opening and closing the front end opening of the suction passage 14. It has. The intake passage 14 is provided with ventilation holes 14a penetrating the center of a sphere 13a constituting the bendable rod 13 and communicating in the axial direction. The base end side has an intake port (not shown) provided in the guide portion 8c1. ) Is communicated with the outside air, and the front end side penetrates the head 11A and is open to the front side. The check valve 15 normally keeps the closed state due to the elasticity of the leaf spring as shown by the solid line in FIG.
When the pressure on the front side of the head is reduced due to the retraction of the pressing head 11A, the head deforms against the retained elasticity as shown by the imaginary line in FIG.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, a replaceable refilling cartridge 16 is interposed between a connecting portion between a filling cartridge 7 and a pusher mechanism 8B. By replacing the refill cartridge 16, the refill cartridge 16 can be refilled with the filled refractory material 6a.

That is, each time the auxiliary cartridge 16 is installed, the refractory material 6a in the auxiliary cartridge 16 is pushed into the cartridge 7 by the forward movement of the pressing head 11B by the operation of the pusher mechanism. From the refill cartridge 7 through the filling hole 9 (see FIG. 2) in the tube wall and into the erosion portion 4, and after the refractory material is replenished, the pressing head 11B is advanced into the cartridge 7. The entire amount of the refractory material 6 in the cartridge 7 is pushed into the erosion part 4 to be filled.

Other configurations are substantially the same as those of the first and second embodiments described above, and FIG. 5 shows a case where the refill cartridge 16 is applied to the second embodiment. The refill cartridge 16 may be applied to the first embodiment shown in FIGS.

In the present embodiment, the refractory material can be refilled by replacing the refill cartridge 16,
Is useful when applied to the repair of the erosion part 4 in which the volume of the refractory material 6 exceeds the volume of the refractory material 6 for repair in the cartridge 7.

FIG. 6 shows a fourth embodiment of the present invention. In this embodiment, a filling cartridge 7 and a pusher mechanism 8 are provided.
C, a replenishing cylinder 18 having a refractory material charging port 17 with a side opening is interposed between the refractory material and the pusher mechanism 8C. There is no substantial difference from the second embodiment except that the refill can be pushed into the filling cartridge 7 through the forward movement of the pressing head 11C by the operation of.
FIG. 6 shows a case where the refill cylinder 18 is applied to the second embodiment, but may be applied to the first embodiment shown in FIGS.

In this embodiment, the refractory material is connected to the pusher mechanism 8.
Since the refilling cartridge 7 can be continuously replenished by the reciprocating movement of the pressing head 11C by the C operation, the erosion of the eroded portion is severe and a large amount of repair material needs to be replenished. Are suitable.

[0051]

According to the present invention, the filling hole and the pusher mechanism for extruding and filling the refractory material for repair from within the cartridge are applied to repair the melted portion of the tap hole. In addition, the repair can be performed safely and easily with high work efficiency regardless of the work being performed in a work place having a poor work environment. In addition, the refractory material for repair can be extruded and filled not only from the front of the furnace to the inside of the furnace, but also from the furnace to the inside of the furnace, so that a uniform construction refractory layer with a high filling density is obtained and the quality of the construction refractory layer is improved. It is possible to extend the life of the tap. Therefore, for example, it is sufficient to perform the repair every weekend, and it is not necessary to replace the tapping block and thus work in a poor working environment such as in the furnace.

As a result, according to the present invention, it is possible to reduce the total repair cost including labor and material costs required for repairing the taphole and to improve the operation rate of the furnace.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a state before the start of construction according to a first embodiment, which is a basic configuration of the repair method of the present invention.

FIG. 2 is a longitudinal sectional view schematically showing a situation during construction.

FIG. 3 is a longitudinal sectional view schematically showing a second embodiment of the repair method of the present invention.

FIG. 4 is a detailed view of a distal end portion of the pusher mechanism of FIG.

FIG. 5 is a longitudinal sectional view schematically showing a third embodiment of the repair method of the present invention.

FIG. 6 is a longitudinal sectional view schematically showing a fourth embodiment of the repair method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 cupola 1a weir 2 tap hole 3 tap block 4 erosion part 5 banking coke 6 repair fireproof material 7 filling cartridge 7a connection end 8 pusher mechanism 8a fluid pressure operated cylinder device 8b piston rod 8c tubular guide part 9 filling hole DESCRIPTION OF SYMBOLS 10 Cover part 11 Pressing head 12 Frame plate 12a Through-hole 13 Flexible rod 13a Sphere 13b Flexible wire rod 14 Intake passage 14a Vent hole 15 Check valve 16 Refill cartridge 17 Input port 18 Refill cylinder 19 Air vent hole

Claims (7)

[Claims] 1. When filling a tap hole of a metal melting furnace, a filling cartridge having substantially the same size and shape as a regular tap hole and having a filling hole in a pipe wall is installed in the molten tap hole. Fixing, while installing a pusher mechanism outside the furnace, operating the pusher mechanism, and extruding and filling the repairable refractory from inside the cartridge through the filling hole in the tube wall into the eroded part. Repair method for taphole of metal melting furnace. 2. The repair method according to claim 1, wherein after the extrusion filling of the repair material into the eroded portion is completed, the cartridge is left in the repair portion as a regular tap hole. 3. The filling cartridge is cylindrical and made of metal or refractory material, and the opening inside the furnace is closed by a lid that can be melted or incinerated by heat during operation of the metal melting furnace. 3. The repair method according to claim 2, wherein: 4. A pusher mechanism comprising a hydraulically operated cylinder device and a pressing head provided on the distal end side of a piston rod of the cylinder device, wherein the pressing head is filled as the piston rod moves forward by the operation of the cylinder device. By pushing out the refractory from the cartridge, and after the pushing and filling is completed, the pressing head is retreated from the cartridge as the rod moves backward. The repair method according to claim 1. 5. A pusher mechanism comprising: a fluid pressure-operated cylinder device; and a bendable rod made of beads connected in a traversing manner, which can reciprocate in a tube guide direction by operating the cylinder device. The curved guide tube has a straight portion at the distal end, a straight portion at the proximal end, and an intermediate curved portion connecting the two straight portions.The straight portion at the distal end of the curved guide tube is coaxial with a filling cartridge fixed in the tap hole. By operating the cylinder device and moving the bendable rod from the inside of the guide tube toward the inside of the filling cartridge in the state of being connected in the shape, the cartridge is moved through the pressing head provided at the tip of the bendable rod. 4. The repair method according to claim 1, wherein the internal refractory is extruded and filled. 6. A refillable refillable refillable refillable cartridge is interposed between a connecting portion of the refillable cartridge and the pusher mechanism, and refilling is performed by replacing the refillable cartridge and operating the pusher mechanism for each replacement. The refillable refractory material is refilled from the refill cartridge to the refill cartridge, and each time the refractory material is replenished, an amount of refractory material commensurate with the replenishment amount is filled from the refill cartridge into the eroded area through the filling hole in the tube wall. The repair method according to any one of claims 1 to 5, wherein the method is extruded and filled. 7. A refill cylinder having a refractory material charging portion with a side opening is interposed between a connecting portion between the filling cartridge and the pusher mechanism, and a repair refractory material is charged into the refill cylinder through the charging portion. Each time, the supplied refractory material is supplied to the filling cartridge by operating the pusher mechanism, and an amount of the refractory material corresponding to the replenishment amount is supplied from the filling cartridge to the erosion portion through the filling hole of the pipe wall. The repair method according to any one of claims 1 to 5, wherein the method is extruded and filled.