JP4801014B2 - Slag outflow prevention plug and plug insertion jig - Google Patents

Description

  The present invention provides a slag outflow prevention system that seals the outlet at the initial stage of discharge so that the slag floating on the surface of the molten steel does not flow out when discharging the molten steel from the outlet of the converter to the ladle in the steelmaking factory. The present invention relates to a plug insertion jig used for mounting the plug and the slag outflow prevention plug on the outlet of the converter.

  The converter has a tap on the upper side, and after finishing blowing, the converter is tilted to allow molten steel to flow out of the tap into the ladle. However, since slag floats on the surface of the molten steel inside the converter, when the converter is tilted, the slag first reaches the outlet and flows out. When a large amount of slag is mixed in steel, the quality of the product is deteriorated, so it is desirable to minimize the outflow of slag to the ladle.

  For this purpose, a slag outflow prevention plug made of a tapered casting has been conventionally used. This slag outflow prevention plug is inserted from the tapping outlet of the converter, but it is made of a casting and is heavy and not easy to handle, and because of the casting, the inner surface of the refractory tapping outlet There are many problems such as difficulty in adhering to the slag and the fact that when the hot water is repeatedly discharged, the inner diameter of the hot water outlet gradually increases, so it is necessary to prepare plugs for preventing slag outflow of different sizes.

  Accordingly, a slag outflow prevention plug mainly composed of aluminum silicate and clay as shown in Patent Document 1 has been developed and put into practical use. The slag outflow prevention plug of Patent Document 1 is provided with a funnel-shaped end face plate at the front end and a base plate at the rear end of a plastic plug body mainly composed of aluminum silicate and clay.

  After inserting the plug for preventing slag outflow into the outlet, pull the claw through the center hole of the plug body to the inside of the funnel-shaped end plate, and pull the funnel-shaped end plate with the claw. Can be swelled in the radial direction to close the tap. This prevents the slag from flowing out at the beginning of discharge and prevents the slag from flowing out.However, when the molten steel reaches the outlet, the specific gravity of the molten steel is much higher than that of the slag, so the plug body is pulled out by the pressure, and the molten steel Does not prevent the outflow.

  Since the plug for preventing slag outflow of this Patent Document 1 is lighter than a cast iron plug, it has an advantage that it can be easily adapted to the inner surface of the tap, and can be accommodated even if the inner diameter of the tap is expanded. It is used for practical use. However, this plug for preventing slag outflow uses a special structure such as a refractory funnel-shaped end face plate or a tension claws, and therefore has a problem that the manufacturing cost is very high.

In addition to aluminum silicate and clay, the plug body of the slag outflow prevention plug of Patent Document 1 includes cellulose as a temporary binder, silicate as a permanent binder, mineral oil as a lubricant, polyelectrolyte alcohol as a plasticizer, etc. In addition, the cost increases due to the fact that it contains many subcomponents, and the plug body hardens due to the evaporation of moisture when stored for a long period of time. In some cases, the gate could not be completely sealed.
Japanese Patent No. 3252909

  Therefore, the object of the present invention is to solve the problem of the plug for preventing slag outflow of Patent Document 1, and can be manufactured at low cost without using a special structure or special raw material, and can be stored for a long time. The slag outflow prevention plug that is lightweight and easy to adapt to the inner surface of the outlet, and can be used even when the inner diameter of the outlet is enlarged, and is used to attach this slag outflow prevention plug to the outlet of the converter It is to provide a jig for plug insertion.

  The slag outflow prevention plug of the present invention made to solve the above problems is a slag outflow prevention plug inserted from the outside of the furnace into the outlet of the converter by means of a plug insertion jig, and has a cylindrical shape. A clay-like plug body that is molded and has an outer peripheral surface coated with a film for preventing drying, and a center part that is attached to a plug insertion jig, and a rear disk disposed on the rear end face of the plug body, The flat front disc disposed on the front end face of the plug main body and the plug extending from the front disc through the plug main body to the rear of the rear disc and pulled by the plug insertion jig. And a linear member that sometimes pulls the front disk and bulges the plug body.

  According to a second aspect of the present invention, it is preferable that the clay-like plug body has an outer peripheral surface covered with a vinyl film.

  Further, as in claim 3, it is preferable that the clay plug body is extruded by a kneader. According to a fourth aspect of the present invention, it is preferable that the clay-like plug main body is obtained by kneading water and oil into raw material soil.

  Further, as in claim 5, the rear disc and the front disc are preferably made of a flammable material, and as in claim 6, the rear disc and the front disc are made of wood. it can.

  Further, as in claim 7, it is preferable that the linear member is a U-shaped wire, and as in claim 8, the attachment portion to the plug insertion jig passes through the plug main body and the front circle. A steel pipe reaching the plate is preferred.

  A plug insertion jig according to the present invention is a plug insertion jig for mounting the slag outflow prevention plug according to claim 1 to a tapping outlet of a converter, the tip of which is attached to the slag outflow prevention plug. The center rod is inserted into the center rod, and an outer cylinder that can be moved forward and backward with respect to the center rod. The center rod has a rear end when the tip of the center rod is inserted into the slag outflow prevention plug mounting portion. A chuck mechanism for chucking the linear member is provided at the tip of the outer cylinder, and the front disk is pulled toward the rear disk together with the linear member by forcibly retracting the outer cylinder. It is characterized by being possible. The chuck mechanism is preferably provided with a cylinder having a tapered inner peripheral surface at the tip, and a split claw that is elastically springed toward the inner peripheral surface by a spring and is forcibly closed. . Moreover, it is preferable that the plug insertion jig of the present invention has a structure in which the whole is mounted on a cart that can be moved up and down.

  The plug for preventing slag outflow of the present invention includes a front disc and a rear disc sandwiching the front and back of a clay-like plug body whose outer peripheral surface is coated with a film for preventing drying, and a rear circle passing through the plug body. The front disk is pulled by a linear member extending to the rear of the plate to swell the plug body, and seals the hot water outlet of the converter. For this reason, the entire structure is simple and can be manufactured at a very low cost without using special structures or special raw materials. In addition, the clay plug body is difficult to dry and can be stored for a long period of time. Moreover, it is lightweight and easily adapted to the inner surface of the tap, and can cope with an increase in the inner diameter of the tap.

  If the outer periphery of the clay-like plug body is covered with a vinyl film as in the second aspect of the invention, it can be manufactured at a low cost, and since moisture permeability is low, drying can be prevented over a long period of time.

  If the clay plug body is extruded by a kneader as in the invention of claim 3, the plug body having a constant outer diameter can be mass-produced at low cost, and the cost can be reduced. If the clay plug body is kneaded with water and oil in the raw soil as in the invention of claim 4, it is necessary to seal the outlet of the converter without using many subcomponents. It can be made plastic.

  If the rear disc and the front disc are made of a flammable material as in the invention of claim 5, they can be easily burned off when in contact with the molten steel, and in particular if wood is used as in claim 6. Production costs are also very low.

  If the linear member is a U-shaped wire as in the invention of claim 7, the front disk can be surely drawn, and the assembly is also easier than using two independent linear members. It will be easy.

  As in the invention of claim 8, if the mounting portion to the plug insertion jig is a steel pipe that penetrates the plug main body and reaches the front disk, it can be manufactured at a low cost, of course, to the outlet of the converter. It becomes easy to perform the insertion work. Moreover, it is convenient because the operator can observe the situation inside the tap through this steel pipe.

  If the jig for plug insertion of the present invention is used, a plug for preventing slag outflow is set at the tip of the center rod, inserted into the hot water outlet of the converter, and the outer cylinder is retracted to chuck the linear member. Further, by forcibly retracting the outer cylinder, the front disk together with the linear member can be drawn toward the rear disk, and the plug main body can be expanded to seal the outlet of the converter. A series of these operations can be performed safely at a position away from the converter outlet. A chuck mechanism comprising a cylinder having a tapered inner peripheral surface at a tip portion and a split pawl that is ejected toward the inner peripheral surface by a spring and is forcibly closed. If it is used, a thin linear member can be surely chucked, and if the whole is mounted on a cart that can be moved up and down as in claim 11, the slag outflow prevention plug is connected to the outlet of the converter. The work of inserting into the is facilitated.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a slag outflow prevention plug according to an embodiment of the present invention, FIG. 2 is a horizontal sectional view, and FIG. 3 is a side view seen from the front end side. In these drawings, 1 is a plug body, 2 is a rear disk arranged in close contact with the rear part of the plug body 1, 3 is a front disk arranged in close contact with the front part of the plug body 1, and 4 is a plug body 1. It is a pipe-shaped attachment part that penetrates the center.

  The plug body 1 is a clay-like columnar body or cylindrical body, which is uniformly kneaded with a raw material soil for ceramics and 5 to 30% by mass of water to give an appropriate viscosity and plasticity, and is extruded by a kneader. Is. Depending on the properties of the raw soil, 10% by mass or less of oil such as mineral oil or vegetable oil may be added to adjust the viscosity and plasticity. In this way, it is best to use the clay as it is from the viewpoint of cost reduction, but it is also possible to use a clay-like material obtained by kneading ceramic particles such as silica and alumina with an organic binder. In this case, the particle diameter is preferably 2 mm or less.

  If extrusion molding is performed with a kneader, a product with a fixed diameter can be easily mass-produced, and it may be cut into a fixed size and used. Since the plug main body 1 is inserted into the hot water outlet of the converter, its outer diameter is assumed to be slightly smaller than the inner diameter of the hot water outlet. In order to prevent the plug body 1 from drying, the outer peripheral surface thereof is covered with a film 5 for preventing drying. As the film 5 for preventing drying, a vinyl film that is inexpensive and has low moisture permeability can be used, but it goes without saying that other resin films may be used. A steel pipe is integrally inserted at the center of the plug main body 1 and its rear end protrudes from the plug main body 1 to constitute a pipe-shaped attachment portion 4 to a plug insertion jig described later. .

  A front disc 3 and a rear disc 2 are in close contact with the front and rear end faces of the plug body 1. These are all flat plates and are made of a combustible material such as wood. In particular, fire resistance is not necessary, and an inexpensive wooden board such as a plywood board is sufficient.

  6 and 6 are linear members that extend from the front disc 3 through the plug body 1 to the rear of the rear disc 2. These linear members 6 and 6 are wires or wires, and when pulled by a plug insertion jig described later, the front disk 3 is pulled toward the rear disk 2 to swell the plug body 1 in the radial direction. It is for making it come out. In this embodiment, as the linear members 6, 6, a wire bent in a U-shape is inserted from the symmetrical position of the front disc 3 and extended to the rear of the rear disc 2. If such a wire is used, manufacture is easy and cost reduction can be achieved.

  The slag outflow prevention plug having such a structure is inserted into the outlet of the converter using, for example, a plug insertion jig 10 as described below.

  4 is an overall view of the plug insertion jig 10 according to the ninth aspect, FIG. 5 is an enlarged view of an essential part thereof, and FIG. 6 is a plan view of FIG. 7 is an enlarged front view of the chuck portion, FIGS. 8 and 9 are enlarged plan views of the chuck portion, and FIG. 10 is an explanatory view showing a state in which the plug body is bulged.

  The plug insertion jig 10 includes a central rod 11 penetrating the central portion over the entire length, and an outer cylinder 12 provided on the outer periphery of the central portion so as to be slidable with respect to the central rod 11. Since the center rod 11 has a length of several meters, and a plug for preventing slag outflow of several kg is attached to the tip of the center rod 11, operation by human power is not always easy. For this reason, as shown in FIG. 4, it is preferable to support the whole on the support stand 50, to mount on the cart 51 which can be moved up and down, and to be able to freely approach the converter. The rear end portion of the center rod 11 is fixed on the bracket 55 of the support base 50. A pulling rod 52 is connected to the end of the outer cylinder 12, and the center rod is operated by operating the operation handle 53 pivotally mounted on the support base 50 from the position (advance position) in FIG. 4 to the right. The outer cylinder 12 can be moved backward with respect to 11. Reference numeral 54 denotes a support roller that supports the outer cylinder 12 so as to freely advance and retract.

  The distal end portion of the center rod 11 is inserted into the pipe-shaped attachment portion 4 of the plug for preventing slag outflow, and a longitudinal slit 13 is formed from the distal end over an appropriate length. The center part of is fitted. A sleeve 14 is fixed to the outer periphery of the distal portion of the center rod 11. As shown in each drawing, the sleeve 14 presses the back surface of the rear disc 2 when the central rod 11 is inserted into the slag outflow prevention plug mounting portion 4. In this state, the plug insertion jig 10 is operated to insert the slag outflow prevention plug into the outlet of the converter.

  As shown in FIGS. 5 to 9, a square bracket 16 that protrudes to the left and right is fixed to the distal end portion of the outer cylinder 12 of the plug insertion jig 10. Further, a substantially rectangular slider 17 that can slide on the central rod 11 is provided at a position immediately before that. Cylindrical bodies 19 are respectively inserted into the protrusions 18 formed on the left and right sides of the slider 17 from the front side, and fastened by bolts 20 inserted from the bracket 16 side. For this reason, the bracket 16 and the slider 17 at the tip of the outer cylinder 12 are substantially integrated, and when the outer cylinder 12 is pulled rearward, the slider 17 is also pulled rearward. These bolts 20 are formed with a central hole 21 through which the linear member 6 of the plug for preventing slag outflow can be passed.

  Chuck mechanisms 30 that chuck the linear member 6 are provided on the left and right sides of the slider 17. As shown in FIGS. 8 and 9, the chuck mechanism 30 includes a split claw 33 whose outer peripheral surface is tapered inside a cylinder 32 having a tapered inner peripheral surface 31 at the tip, and is a built-in spring. 34, the divided claw 33 is repelled forward toward the inner peripheral surface 30 through the metal fitting 35. When the linear member 6 is passed between the split claws 33, the split claws 33 chuck the linear member 6. However, when the entire chuck mechanism 30 is pulled backward, the split claws 33 are inwardly formed by the tapered inner peripheral surface 31. The linear member 6 is chucked more firmly. It is preferable that the inner surface of the split claw 33 is provided with jagged teeth so that the linear member 6 does not slip.

  The chuck mechanism 30 is bolted to the side surface of the slider 17 by the fixing member 39 with the flat portion 36 formed on the outer peripheral side surface of the cylinder 32, and the cylindrical body 19 holds the rear end portion of the cylinder 32. It is fixed to the left and right sides of the. For this reason, if the linear member 6 is passed through the central portion of the chuck mechanism 30 and the central hole 21 of the bolt 20 as shown in FIG. 8 and the slider 17 is retracted, the chuck mechanism 30 becomes as shown in FIG. It will slide on the center rod 11 while pulling the linear member 6.

  A flange 37 is provided at the rear end of the sleeve 14 and a nozzle-like metal fitting 38 is attached. These nozzle-shaped metal fittings 38 function as a guide for allowing the linear member 6 to pass through the chuck mechanism 30 and, when the slider 17 is advanced, push the divided claw 33 against the spring 34 to open the divided claw 33. The function of enabling the linear member 6 to be extracted is exhibited.

  In order to insert the plug for preventing slag outflow of the present invention into the outlet of the converter using the plug insertion jig 10 having such a structure, first, the tip of the center rod 11 of the plug insertion jig 10 is shown in FIG. 5 is inserted into the mounting portion 4 as shown in FIG. At this time, the linear member 6 is fitted into the slit 13 at the front end of the center rod 11 so that the front end of the sleeve 14 of the plug insertion jig 10 contacts the rear disc 2. Further, the linear member 6 extending rearward of the rear disk 2 of the slag outflow prevention plug is set through the chuck mechanism 30. In this state, the plug insertion jig 10 is moved forward together with the support base 50, and the slag outflow prevention plug is inserted into the outlet of the converter. Since the sleeve 14 is fixed to the center rod 11 and the rear disk 2 can be pushed in, this insertion operation can be performed without any trouble.

  Next, with the center rod 11 of the plug insertion jig 10 fixed at that position, the operation handle 53 is operated backward to pull the outer cylinder 12 backward. As a result, the bracket 16, the slider 17, the chuck mechanism 30 and the like at the tip of the outer cylinder 12 are also moved backward. As described above, the split claw 33 of the chuck mechanism 30 strongly chucks the linear member 6 and pulls it backward, so that the front disc 3 of the plug for preventing slag outflow on which the linear member 6 is hung is used as the rear disc. It is drawn in the direction of 2. In addition, since the slit 13 is formed in the front-end | tip part of the center rod 11, the movement to the back of the linear member 6 is performed without trouble. In this way, the front disc 3 is retracted, but the rear disc 2 is in contact with the tip of the sleeve 14 and cannot be retracted. Therefore, as shown in FIG. Adheres closely to the inner surface of the furnace outlet and seals the outlet. Thereafter, the operation handle 53 is returned to the front to open the split claw 33 of the chuck mechanism 30, and the plug insertion jig 10 is pulled out together with the center rod 11 from the slag outflow prevention plug.

  If the converter is tilted in this state, the slag floating on the surface of the molten steel first reaches the outlet, but the outlet is sealed by the plug body 1 bulging in the radial direction. Spillage is prevented. The portions other than the plug main body 1 are burned or melted by contact with the high-temperature slag, but the plug main body 1 is sintered and remains on the inner surface of the tap.

  When the converter is further tilted and the molten steel reaches the tap, the plug body 1 falls off due to the pressure of the molten steel much larger than the slag, and the molten steel is discharged from the tap into the ladle. Since the plug body 1 is made of clay and has the same components as the slag, it immediately floats even if it falls into the molten steel. And since the mass is very small compared with the mass of the whole molten steel, it does not contaminate molten steel.

  As described above, the slag outflow prevention plug of the present invention can be manufactured at low cost, and is lightweight, easily adaptable to the inner surface of the tap, and can easily cope with an increase in the inner diameter of the tap. is there. Moreover, since the outer peripheral surface of the plug body 1 is covered with the film 5 for preventing drying, it can be stored for a long time.

Furthermore, if the attachment portion 4 to the plug insertion jig is a steel pipe, the operator can observe the inside condition of the tap from the center hole, and can grasp the timing of slag and molten steel reaching the tap. Therefore, there is an advantage that the work is easy to perform.
Next, examples of the present invention will be described.

  Water was mixed with porcelain clay excavated from the Seto district of Aichi Prefecture to adjust the moisture content to around 25%, and this was put into a kneader and extruded into a cylindrical shape with an outer diameter of 230 mm. This was cut into a length of 160 mm, and the outer periphery thereof was completely covered with a vinyl film for preventing drying. A front disc and a rear disc obtained by cutting the front and rear veneer plates into a circle were attached, and a steel pipe serving as an attachment portion was inserted in the center. Further, a linear member obtained by bending a piano wire into a U-shape was inserted from the front disc, and its rear end was projected about 2 m behind the rear disc.

  This slag outflow prevention plug was inserted into the hot water outlet of the converter using a plug insertion jig and sealed. The internal diameter of the hot water outlet of the converter is 250 mm. This sealing work was performed 20 minutes before the start of blowing by the converter, and the hot water was discharged. The slag was completely shut off to the point where it was suspected that the tap was clogged, and then the slag fell off when the molten metal reached the tap. Therefore, it was confirmed that the purpose of preventing slag outflow was completely achieved.

  In addition, it was confirmed that the slag outflow prevention plug of the present invention has a cost of 1/2 or less as compared with the conventional product described in Patent Document 1, and can be stored for a long period of one month or more.

It is a perspective view which shows the plug for slag outflow prevention. It is a horizontal sectional view showing a plug for slag outflow prevention. It is the side view which looked at the plug for slag outflow prevention from the front end side. It is a whole figure of the jig for plug insertion. It is an enlarged view of the principal part of the jig for plug insertion. FIG. 6 is a plan view of FIG. 5. It is an enlarged front view of a chuck | zipper part. It is an enlarged plan view of a chuck part. It is an enlarged plan view of a chuck part. It is explanatory drawing of the state which expanded the plug main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug main body 2 Back part disk 3 Front part disk 4 Attachment part 5 Drying prevention film 6 Linear member 10 Plug insertion jig 11 Center rod 12 Outer cylinder 13 Slit 14 Sleeve 16 Bracket 17 Slider 18 Projection part 19 Column Body 20 Bolt 21 Center hole 30 Chuck mechanism 31 Tapered inner peripheral surface 32 Cylinder 33 Dividing claw 34 Spring 35 Metal fitting 36 Flat part 37 Flange 38 Nozzle-like metal fitting 39 Fixing member 50 Support base 51 Carriage 52 Tow rod 53 Operation handle 54 Support Roller 55 bracket

Claims (11)

  A slag outflow prevention plug inserted from the outside of the furnace into the outlet of the converter by a plug insertion jig, which is formed in a cylindrical shape and whose outer peripheral surface is covered with a film for preventing drying, and for plug insertion at the center. A clay plug body provided with an attachment portion to a jig, a rear disk disposed on the rear end face of the plug body, and a flat front disk disposed on the front end face of the plug body; A linear member extending from the front disk through the plug body to the rear of the rear disk, and pulling the front disk when the plug insertion jig is pulled to bulge the plug body. A plug for preventing slag outflow characterized by comprising.   The plug for preventing slag outflow according to claim 1, wherein the clay plug body has an outer peripheral surface coated with a vinyl film.   The plug for preventing slag outflow according to claim 1, wherein the clay plug body is extruded by a kneader.   The plug for preventing slag outflow according to claim 1, wherein the clay plug body is obtained by kneading water and oil into raw material soil.   The slag outflow prevention plug according to claim 1, wherein the rear disc and the front disc are made of a combustible material.   The plug for preventing slag outflow according to claim 5, wherein the rear disk and the front disk are made of wood.   The plug for preventing slag outflow according to claim 1, wherein the linear member is a U-shaped wire.   The slag outflow prevention plug according to claim 1, wherein the attachment portion to the plug insertion jig is a steel pipe that penetrates the plug body and reaches the front disc.   A plug insertion jig for mounting the slag outflow prevention plug according to claim 1 to a tapping outlet of a converter, wherein a tip end portion is inserted into an attachment portion of the slag outflow prevention plug, An outer cylinder that can be moved forward and backward with respect to the center rod, and a sleeve that holds the back of the rear disk when the tip of the center rod is inserted into the slag outflow prevention plug mounting portion is fixed to the center rod. A plug mechanism is provided in which a chuck mechanism for chucking the linear member is provided at the tip of the shaft, and the front disk can be pulled toward the rear disk together with the linear member by forcibly retracting the outer cylinder. Jig.   The chuck mechanism is characterized by comprising a cylinder having a tapered inner peripheral surface at the tip, and a split claw that is ejected toward the inner peripheral surface by a spring and is forcibly closed. The plug insertion jig according to claim 9.   10. The plug insertion jig according to claim 9, wherein the whole is mounted on a cart that can be moved up and down.

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