JP2007131874A - Boring tool, device for replacing sleeve brick, and method for replacing sleeve brick - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boring tool which has the extended life and can shorten an operation period of time. <P>SOLUTION: The boring tool for boring and removing a cylindrical sleeve brick (S) having a hole which passes through a molten-metal vessel, by striking the sleeve comprises: a holder 91 which has a striking face part 911 for striking the cylindrical sleeve brick along the axial direction of the cylindrical sleeve brick and a recess part 914 approximately in the center of the striking face part; a plurality of peripheral bits 92 which are implanted in a perimeter of the striking face part and crack the sleeve brick by striking it; and a plurality of inner circumferential bits 93 which are implanted in the inside of the plurality of the peripheral bits and the perimeter of the recess part, and presses cracked piece S1 of the sleeve brick produced by striking of the peripheral bits into the center of the recess part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drilling tool for punching and removing a cylindrical sleeve brick that forms a hole penetrating the inside and outside of a molten metal container such as a converter, and a sleeve brick including the drilling tool. The present invention relates to an exchange device and a sleeve brick exchange method using the exchange device.

  In general, molten metal containers are severely damaged by refractories on their inner walls, and particularly the pain in steel outlet holes of steelmaking converters and tuyeres (nozzles) for blowing oxygen and other gases. For this reason, local repair is performed by exchanging the sleeve bricks at the outlet holes and tuyeres every time they are damaged.

  Conventionally, when replacing the above-mentioned sleeve bricks, the worker has shredded and removed the sleeve bricks in the high temperature state after the completion of steel production with a breaker. However, the work in such a high temperature environment is dangerous and requires high installation. It took a lot of effort to replace sleeve bricks that required accuracy. For this reason, it took a long time to replace the sleeve brick, and as a result, the operating rate of the furnace was reduced and productivity was lowered. Furthermore, with the increase in the size of the sleeve bricks, it has become difficult to perform mounting work by human power.

In order to solve such a problem, conventionally, a sleeve brick exchange device provided with a cutting tool (perforation tool) for cutting and removing a sleeve brick in a molten metal container by rotation is known (for example, see Patent Document 1).
In the configuration described in Patent Document 1, a sleeve brick exchange device includes a blade base that rotatably mounts a blade at the tip, a guide frame on which the blade base is mounted so as to freely move back and forth, and the guide frame. It is equipped with a movable carriage or a fixed gantry that can be held in a horizontal traverse, lift, elevation, and turn. The cutting tool is formed in a bottomed cylindrical shape, and a cutting edge is provided on the opening end surface. The depth from the blade edge to the inner bottom is at least equal to the thickness of the sleeve brick.

In such a sleeve brick exchange device, after pressing the blade tool against the sleeve brick, the blade tool base is moved forward by the guide frame while rotating and propelling force, and further striking the blade tool. The cylindrical core can be cut off and removed.
That is, by rotating, propelling and hammering the bottomed cylindrical blade, the sleeve brick is cut with the blade edge provided at the opening end surface portion of the bottomed cylinder, and the cut sleeve brick is sequentially inside the blade tool. Get in. And finally, the central part of the sleeve brick is cut off as a cylindrical core.

Japanese Patent Laid-Open No. 58-158489 (see FIG. 1)

  However, in the configuration described in Patent Document 1, since the cutting tool has a bottomed cylindrical shape, a large frictional resistance is generated between the inner peripheral surface of the cutting tool and the sleeve brick at the final stage of the cutting work of the sleeve brick. Therefore, there is a possibility that cutting cannot be performed smoothly. This may increase the time required for cutting. Further, due to the frictional resistance, a large rotational torque is required for the rotation of the blade, and a large load is applied to the base end portion of the blade. As a result, the tool life is shortened and may need to be replaced frequently.

  In view of the above-described problems, the present invention uses a drilling tool that can extend the life and shorten the working time, a sleeve brick replacement device including the drilling tool, and the replacement device. It aims at providing the replacement method of a sleeve brick.

  The invention according to claim 1 is a drilling tool for drilling and removing a cylindrical sleeve brick that forms a hole portion penetrating the inside and outside of a molten metal container, and the cylindrical sleeve brick is A holder having a striking surface portion for striking along a cylindrical axial direction, a holder having a concave surface portion formed substantially at the center of the striking surface portion, and being implanted at the outer peripheral end of the striking surface portion, and the sleeve by striking A plurality of outer peripheral bits that cause the brick to crack, and a crack piece of the sleeve brick that is implanted inside the plurality of outer peripheral bits and on the outer peripheral end side of the concave surface portion, and is generated by hitting the outer peripheral bit. And a plurality of inner peripheral side bits that are pushed into the center side of the concave surface portion.

  A second aspect of the present invention is the drilling tool according to the first aspect, wherein tips of the outer peripheral side bit and the inner peripheral side bit are flattened.

  According to a third aspect of the present invention, in the drilling tool according to the first or second aspect, the outer peripheral side bit has a substantially wedge shape with a ridge line portion formed at the tip. It is a tool.

  According to a fourth aspect of the present invention, in the drilling tool according to the third aspect, the holder rotates about an axis in a normal direction of the striking surface portion, and the outer peripheral side bit extends in a rotational tangential direction of the holder. A drilling tool, wherein the ridge line portion is arranged to follow.

  According to a fifth aspect of the present invention, in the drilling tool according to the third aspect, the holder rotates about an axis in a normal direction of the striking surface portion, and the outer peripheral side bit rotates in a rotational radial direction of the holder. A drilling tool, wherein the ridge line portion is arranged to follow.

  According to a sixth aspect of the present invention, in the drilling tool according to any one of the first to fifth aspects, the holder has a side surface portion that intersects at an outer peripheral edge of the striking surface portion. The drilling tool is characterized in that a substantially wedge-shaped side bit extending in the normal direction of the striking surface portion is implanted.

  According to a seventh aspect of the present invention, in the drilling tool according to any one of the first to sixth aspects, at least one of the outer peripheral side bit, the inner peripheral side bit, and the side surface bit is: A drilling tool characterized in that a welded metal is filled and fixed in a tapered hole formed to expand around a planting hole in which the bit is implanted.

  According to an eighth aspect of the present invention, in the drilling tool according to any one of the first to seventh aspects, the holder rotates about an axis in a normal direction of the striking surface portion, and the striking proximal end of the holder On the side, an annular member is provided in a loosely fitted state with respect to the holder, and a cutting blade is provided on the outer peripheral surface of the annular member so that the cutting edge extends along the striking direction and breaks the remaining sleeve brick. It is a drilling tool characterized by having it.

  A ninth aspect of the present invention is a sleeve brick exchanging device comprising the drilling tool according to any one of the first to eighth aspects, wherein the sleeve brick is exchanged, and the outside of the molten metal container is moved back and forth. A moving carriage, a traverse table provided on the carriage so as to be able to traverse in a direction substantially orthogonal to the moving direction of the cart, a swivel table provided on the traverse stand so as to be turnable; A tilting frame provided so as to be tiltable upward, and a tool boom and a sleeve boom which are arranged in parallel to each other on the tilting frame and can be vertically moved and tilted as a unit. The boom is attached with the drilling tool, a tool boom cylinder for moving the drilling tool forward and backward, and a drift tower for applying a vibration force and a rotational force to the drilling tool. The sleeve boom includes a sleeve support for holding a replacement sleeve brick at the tip of the sleeve boom, a sleeve insertion frame to which the sleeve support is attached, and the sleeve insertion frame. And a sleeve boom cylinder for moving the sleeve forward and backward, and the drilling tool and the sleeve support are movable in any direction in a three-dimensional space.

  According to a tenth aspect of the present invention, in the sleeve brick replacement device according to the ninth aspect, the front and lower sides of the carriage can be expanded and contracted in the movement direction of the carriage and can be moved in the vertical direction. A sleeve brick exchange device characterized in that a work deck is provided.

  According to an eleventh aspect of the present invention, in the sleeve brick replacement device according to the ninth or tenth aspect, a protective roof projecting toward the front of the carriage is provided in front of and above the carriage. And the front part of this protective roof is a sleeve brick replacement device characterized in that it can be expanded and contracted in the moving direction of the carriage.

  The invention according to claim 12 is the exchanging apparatus for sleeve bricks according to claim 11, wherein the lifting device is capable of traversing in the direction perpendicular to the moving direction of the carriage on the front and lower side of the protective roof. A sleeve brick exchange device characterized in that is provided.

  According to a thirteenth aspect of the present invention, in the sleeve brick replacement device according to any one of the ninth to twelfth aspects, each axial center is formed on a surface including the axial centers of the tool boom and the sleeve boom. A sleeve brick exchange device comprising a centering device that irradiates a light beam for centering parallel to the sleeve.

  The invention described in claim 14 uses a sleeve brick replacement device according to claim 13 to hot-roll the cylindrical sleeve brick that forms the output steel hole in the molten metal container provided with the output steel hole. The method of replacing the sleeve brick to be replaced with a step of adjusting the posture of the tool boom by irradiating with a light beam so as to coincide with the axial center of the sleeve brick, and in the initial stage, The sleeve brick is drilled by striking and rotating the drilling tool, the frequency of striking the drilling tool is reduced from the final stage to the time of penetration, and the drilling tool is repeatedly advanced and retracted mainly by the rotation, thereby the sleeve brick A sleeve comprising: a perforating step for perforating a sleeve; and a step of traversing the traverse base to cause the sleeve boom to face the hole after perforating and inserting a replacement sleeve brick. It is a method of replacing the tiles.

  The invention according to claim 15 uses the sleeve brick replacement device according to claim 13 to exchange hot the tubular sleeve brick forming the tuyere in the molten metal container provided with tuyere. A method for replacing the sleeve brick, the step of extending the front portion of the work deck and the protective roof to a position close to the outer surface of the converter, and providing the work environment; Removing the formed member and carrying it out by the hoist, adjusting the posture of the tool boom by irradiating with a light beam so as to coincide with the axis of the sleeve brick, and a drilling tool Drilling and rotating the sleeve brick and the residue in the molten metal container by striking and rotating, and traversing the traverse base so that the sleeve boom faces the hole after drilling and replacing Is a method of replacing the sleeve brick, characterized by comprising a step of inserting the over blanking bricks.

According to the drilling tool of the present invention, the lifetime of the drilling tool can be extended and the drilling operation of the sleeve brick can be performed in a short time.
That is, according to the drilling tool described above, in the drilling operation of the sleeve brick, cutting can proceed to a state in which the through hole of the sleeve brick is expanded, and in this case, the crack piece once crushed is a portion where the sleeve brick is crushed It is less likely to be pushed into For this reason, the shaft runout of the drilling tool is reduced, and the sleeve brick can be drilled with high accuracy. In addition, the outer peripheral side bit and the inner peripheral side bit have separate functions for cutting and extruding the sleeve bricks, and cracks once crushed do not become an obstacle to cutting. Smooth cutting without receiving external force. As a result, the sleeve brick can be quickly drilled, and damage to each part of the drilling tool can be reduced as much as possible. For this reason, the lifetime of a drilling tool can be extended and the frequency | count of replacement | exchange of a drilling tool can be reduced. Furthermore, since the load on the apparatus side that gives a striking force to the drilling tool can be reduced, the life on the apparatus side can be extended.
For example, when the sleeve brick in a molten metal container such as a converter is removed and replaced, the time required for drilling the sleeve brick can be shortened, so that the entire operation time can be shortened. As a result, since the period during which the operation of the converter is stopped in order to replace the sleeve brick can be shortened, a long operation time of the converter can be ensured.

According to the second aspect of the present invention, when the sleeve brick is perforated, the contact area between the tip of each bit and the sleeve brick becomes large, and a plurality of pieces can be applied to the contact portion of the sleeve brick by a single impact operation. Cracks can occur. For this reason, it can prevent that the front-end | tip part of each of an outer peripheral side bit and an inner peripheral side bit is worn out early, and can improve a drilling speed.
Therefore, the lifetime of the drilling tool can be extended and the working time can be shortened. As a result, the period during which the operation of the converter is stopped in order to replace the sleeve brick is shortened, and a long operation time of the converter can be ensured.

  According to the third aspect of the present invention, for example, when the sleeve brick is drilled in a molten metal container such as a converter, the sleeve brick can be crushed by forming a linear cut at the ridge line portion of the wedge shape. it can. Moreover, even when a bullion exists between the sleeve brick and a part of the converter that holds the sleeve brick, the bullion can be cut and crushed. For this reason, the drilling speed of the sleeve brick can be improved, and precise drilling can be realized without causing the drilling tool to shake. And since the operator does not need to perform a removal operation | work with a breaker separately with respect to the metal which remained after removing a sleeve brick like the past, work time can be reduced significantly.

  According to the fourth aspect of the present invention, when the sleeve brick is drilled, the inner peripheral surface of the cylindrical sleeve brick can be cut along the circumferential direction of the sleeve brick by the outer peripheral side bit. Cutting efficiency can be further improved.

  According to the fifth aspect of the present invention, when the sleeve brick is drilled, the inner peripheral surface of the cylindrical sleeve brick can be cut along the radial direction of the sleeve brick by the outer peripheral side bit. Cutting efficiency can be further improved.

  According to the sixth aspect of the present invention, for example, when a sleeve brick is drilled in a molten metal container such as a converter, a ground having an irregular shape is formed between the sleeve brick and a part of the converter holding the sleeve brick. Even when gold is present, the side bit cuts into the metal in the axial direction of the sleeve brick, so that the holder can be prevented from shaking. For this reason, the precision of perforation can be improved. Further, it is possible to prevent the side surface portion of the holder from being worn out by friction with the metal base and the sleeve brick at the side surface bit. For this reason, the lifetime of a drilling tool can be further extended.

  According to the seventh aspect of the present invention, it is possible to obtain a good fixing state of each bit to the holder even at a high temperature. As a material for each bit, for example, when a cemented carbide obtained by adding cobalt powder (Co) as a binder to tungsten carbide (WC), a good fixing state can be obtained even in a temperature environment of 800 to 1000 ° C. . For this reason, it can be repeatedly used without being damaged even in a high temperature environment. Further, since the sleeve brick and the metal are in a fragile state in a high temperature environment, and the fixing state of each bit is stable, the drilling operation can be performed with high efficiency. Therefore, the lifetime of the drilling tool can be extended and the working time can be shortened.

  According to the eighth aspect of the present invention, in the drilling operation, the plurality of cutting blades of the annular member pierce the sleeve brick remaining after being cut by the outer peripheral side bit and the inner peripheral side bit. Since the annular member is provided in a loosely fitted state with respect to the holder, the annular member does not rotate even if the holder rotates, and only the striking force applied to the holder is transmitted to the remaining portion of the sleeve brick. Thereby, the remaining part of the sleeve brick can be cut vertically along the axial direction of the sleeve brick with a plurality of cutting blades. Therefore, for example, in a molten metal container such as a converter, an operator does not remove the remaining portion of the sleeve brick with a separate breaker or the like, with respect to the tuyere sleeve brick whose outer peripheral surface is formed in a tapered shape. Since all can be removed at once with a drilling tool, the drilling operation can be performed quickly and efficiently.

According to the sleeve brick exchanging device of the present invention described in claim 9, the life of the drilling tool can be extended similarly to the drilling tool according to any one of claims 1 to 8, and Work time can be shortened. Further, since the drilling tool does not receive an extra external force from the sleeve brick side, it is possible to reduce the load on the drifter unit that gives a striking force to the drilling tool, thereby extending the life of the entire exchange device. Since the tool boom and the sleeve boom are provided on the tilting frame, for example, once the tool boom is centered, there is no need to center again with the sleeve boom, so that the work time can be shortened. Also, high-temperature sleeve bricks can be removed at high speed and with high accuracy by drilling tools without being shredded and removed by a separate breaker, and a new sleeve brick can be inserted with a sleeve boom. Can do. For this reason, a sleeve brick can be replaced easily and quickly.
For example, in a molten metal container such as a converter, the replacement work can be easily and quickly performed on a sleeve brick in a high temperature state after the completion of steel production, so that the operating rate of the converter can be prevented from being reduced. . Moreover, since it is not necessary for the operator to directly replace the sleeve brick in the converter in a high temperature state as in the prior art, the safety of the operator can be ensured.

  According to the tenth aspect of the present invention, in the replacement work of the sleeve bricks, it is possible to secure the operator's footing and to adjust the work position to a suitable work position according to the work situation. For example, even when working on a molten metal container such as a converter placed in a cliff-shaped space, if the replacement device is arranged up to the cliff-shaped ground edge and the work deck is further extended, it becomes a scaffold. Even when there is no ground, a worker's foothold can be secured.

  According to the eleventh aspect of the present invention, in the replacement work of the sleeve brick, for example, the operator can be protected from a fallen object from the upper part. Therefore, it is possible to ensure the safety of the worker who is working.

  According to the present invention described in claim 12, for example, when a hoist provided with a hook capable of suspending a jig at the bottom of the converter is used as a lifting device, the jig is suspended from the hook. If this is moved to a place where it does not interfere with the operator's work, the replacement work can be performed smoothly.

  According to the thirteenth aspect of the present invention, for example, the centering device can be operated while visually confirming the position of the core, so that the centering can be performed with high accuracy. As a result, the sleeve brick can be drilled with high accuracy, and a new sleeve brick can be accurately inserted into the hole formed after drilling. In particular, if the beam axis is aligned with the axis of the sleeve brick, the axis of each of the tool boom and the sleeve boom can be aligned with the axis of the sleeve brick simply by sliding the traverse base. The exchange operation can be performed quickly and easily.

  According to the sleeve brick replacement method of the present invention as set forth in claim 14, the life of the drilling tool can be extended similarly to the drilling tool according to any one of claims 1 to 8, and Work time can be shortened. The sleeve brick can be cut at high speed in the initial stage of drilling, and the sleeve brick and the metal can be cut together from the final stage of drilling to the time of penetration. In particular, even when cutting an irregularly shaped metal, cutting can be performed with high accuracy without causing shaft deflection with a drilling tool. In this way, the final stage does not become a bottleneck as in conventional work, and there is no need for crushing and removal with a separate breaker. Therefore, it is possible to drill sleeve bricks at once without avoiding bare metal with a single drilling tool, so there is no loss of time and high efficiency. As a result, long converter operation time is ensured. Can do.

  According to the sleeve brick replacement method of the present invention as set forth in claim 15, as with the drilling tool according to any one of claims 1 to 8, the life of the drilling tool can be extended, and Work time can be shortened. And since the in-container residue and sleeve brick remaining at the bottom of the converter can be drilled in one operation, the operator uses a jet lance, breaker, etc. after drilling the sleeve brick as in the past. Compared to the configuration in which the residue in the container is crushed, it is very safe and the working efficiency can be greatly improved. Therefore, replacement of the sleeve brick at the tuyere can be completed in a short time, and as a result, a long converter operation time can be secured.

(1) 1st Embodiment Below, 1st Embodiment of this invention is described based on drawing. FIG. 1 is a side view schematically showing a sleeve brick exchange device according to a first embodiment of the present invention, and FIG. 2 is a plan view thereof.

(1-1) Overall configuration of sleeve brick replacement device 1 In FIGS. 1 and 2, the replacement device 1 punches and removes the sleeve brick of the steel outlet hole in the converter in a high temperature state by striking, and creates a new sleeve brick. It is a device to replace with.
The exchange device 1 includes a carriage 10, a traverse base 20, a turning table 30, a tilting frame 40, a tool boom 50, a sleeve boom 60, a centering device 70, a drive source 80, and a drilling tool 90. It has. The exchange device 1 can move the drilling tool 90 and a sleeve support 61 described later in any direction in the three-dimensional space.

  As shown in FIG. 1, the carriage 10 includes a frame portion 11 and a moving portion 12 that moves the frame portion 11, and can move back and forth outside the converter. In the following, the forward direction of the carriage 10 is referred to as a forward direction, the backward direction of the carriage 10 is referred to as a backward direction, the right with respect to the forward direction of the carriage 10 is referred to as the right direction, and the left with respect to the forward direction of the carriage 10 is referred to as the left direction. I will explain.

  As shown in FIG. 1, the frame portion 11 includes, for example, a substantially rectangular bottom portion 111, a plurality of support columns 112 erected at the four corners of the bottom portion, and a ceiling portion 113 connected to the upper end portions of the support columns 112. It is the structure provided with. Such a frame part 11 is provided with a work deck 13, a protective roof 14, and a hoist 15 (lifting device).

  Although not shown, the moving unit 12 is configured as a traveling device including a sprocket and an idler that are rotatably provided at the front and rear ends of the bottom of the frame unit 11, and a crawler wound around the sprocket and the idler. The frame unit 11 travels in the front-rear direction.

  As shown in FIGS. 1 and 2, the work deck 13 is provided in front of the bottom portion 111 of the carriage 10 so as to be extendable along the front-rear direction and movable in the up-down direction. The work deck 13 can be used as a scaffold for the operator in sleeve brick replacement work described later.

  As shown in FIGS. 1 and 2, the protective roof 14 is provided in a state of projecting forward in front of the ceiling portion 113 of the carriage 10, and in front of the protective roof along the front-rear direction. A stretchable guard 141 (front portion) is provided. With this guard 141, it is possible to protect the operator from falling objects from the upper part in the replacement work of the sleeve brick described later.

  As shown in FIG. 1, the hoist 15 is provided so as to be able to traverse in the front-rear and left-right directions on the front and lower side of the protective roof 14. Such a hoist 15 suspends an object such as a furnace bottom cover or a jig of a converter from a hook 151 to move the object up and down and move in the front-rear and left-right directions.

  As shown in FIG. 2, the traversing base 20 includes four slide bearings 21 provided on the bottom 111 of the carriage 10, and a slide shaft 22 that is supported by the slide bearings 21 and extends in the left-right direction. Thus, it is provided on the bottom 111 so as to traverse in the left-right direction. And by operation | movement of the traverse cylinder 23 provided on the bottom part 111, each apparatus loaded on the said base with the traverse base 20 can be traversed.

  The turning table 30 is a substantially circular table provided so as to be able to turn above the traverse base 20. And by each action | operation of the turning motor 31 (refer FIG. 1), each apparatus loaded on the said table with the turning table 30 can turn.

The tilt frame 40 is provided above the turntable 30 and supports the tool boom 50 and the sleeve boom 60 so as to be tiltable.
That is, as shown in FIG. 1, the tilt frame 40 includes a main body 41 attached above the turntable 30 and a tilt cylinder 44 connected to the main body 41 via tilt pins 42 and 43 so as to be tiltable. , 45 and boom connecting rods 46, 47 attached to the upper ends of the tilting cylinders 44, 45, respectively. The boom connecting rods 46 and 47 are arranged in parallel to each other, and a tool boom 50 and a sleeve boom 60 are mounted on the boom connecting rods 46 and 47 in parallel to each other with a predetermined interval. As a result, the tool boom 50 and the sleeve boom 60 attached in a state orthogonal to the boom connecting rods 46 and 47 can be tilted by the operation of one of the tilt cylinders 44 and 45, and the tilt cylinders 44 and 45 It can be moved up and down by simultaneous operation.

  The tool boom 50 can move up and down and tilt together with the sleeve boom 60 by the operation of the tilt frame 40. As shown in FIG. 1, such a tool boom 50 includes a drifter rod 51 attached to a distal end of the drill boom 90 in a removable state, a drifter unit 52 provided on the proximal end side of the drifter rod 51, A drifter frame 53 that accommodates the drifter unit 52 therein and a tool boom cylinder 54 that moves the drifter frame 53 forward and backward are provided.

The drifter rod 51 has a cylindrical tip end, and a female screw is screwed on the inner peripheral surface thereof (see FIG. 3). A holder 91 (to be described later) of the drilling tool 90 is screwed into this female screw.
The drifter unit 52 applies an impact force along the axial direction of the drifter rod 51 and a rotational force about the axis of the drifter rod 51 to the drilling tool 90 via the drifter rod 51. The striking force by the drifter unit 52 is, for example, 880 J, and the striking number is, for example, 2800 bpm. The rotational force by the drifter unit 52 is, for example, 4900 to 9800 N · m, and the rotational speed is, for example, 40 to 80 min ⁻¹ .
The tool boom cylinder 54 is capable of moving the drilling tool 90 forward and backward by moving the drifter frame 53 forward and backward along the axial direction of the drifter rod 51.

  The sleeve boom 60 can be moved up and down and tilted together with the tool boom 50 by the operation of the tilting frame 40. As shown in FIG. 2, such a sleeve boom 60 includes a sleeve support 61 that can hold a replacement sleeve brick S at the tip, and a sleeve insertion frame 62 that holds the base end side of the sleeve support 61. And a sleeve boom cylinder 63 for moving the sleeve insertion frame 62 forward and backward.

The sleeve support 61 has a configuration that is formed in a protrusion shape that can be inserted into the through hole of the sleeve brick S as shown in FIG. 2, a configuration that includes a gripping mechanism (not shown) that grips the end of the sleeve brick S, and the like. It can be adopted.
The sleeve boom cylinder 63 moves the sleeve support 61 forward and backward through the sleeve insertion frame 62, so that the sleeve brick S can move forward and backward.

  The centering device 70 is located in a plane connecting the axis centers of the tool boom 50 and the sleeve boom 60, that is, at an intermediate position between the tool boom 50 and the sleeve boom 60 in the boom connecting rod 46, for example, as shown in FIG. Is provided. The centering device 70 can irradiate a laser beam for centering parallel to the axis of each of the tool boom 50 and the sleeve boom 60. Thereby, in the replacement work of the sleeve brick described later, if the beam axis of the centering device 70 coincides with the axis of the sleeve brick to be drilled, the traverse base 20 is slid in the left-right direction, whereby the tool boom 50 And each axis of the sleeve boom 60 and the axis of the sleeve brick coincide with each other.

  The drive source 80 is, for example, a diesel engine, and is provided behind the bottom 111 of the carriage 10 as shown in FIGS. 1 and 2. A hydraulic pump 81 that operates by power transmission from the drive source 80 is provided in front of the drive source 80 and on the bottom 111. By the hydraulic pressure supplied from the hydraulic pump 81 through a pipe (not shown), the moving unit 12, the work deck 13, the guard 141, the hoist 15, the traverse cylinder 23, the swing motor 31, the tilt cylinders 44 and 45, the tool boom 50, Each part such as the sleeve boom 60 can be driven.

(1-2) Configuration of Drilling Tool 90 Next, a specific configuration of the drilling tool 90 will be described based on the drawings. FIG. 3 is a side sectional view showing the drilling tool in the present embodiment, and FIG. 4 is a plan view thereof.

  The drilling tool 90 is a tool for drilling and removing a cylindrical sleeve brick that forms a steel outlet hole penetrating the inside and outside of the converter. As shown in FIG. 3, the drilling tool 90 includes a holder 91, a plurality of outer peripheral bits 92, a plurality of inner peripheral bits 93, and a plurality of side bits 94.

  As shown in FIG. 3, the holder 91 is formed in a substantially cylindrical shape with a metal material such as S45C (JIS), for example, and gradually increases in diameter toward the cylindrical tip (right end in the figure). Thus, the tip end portion is closed by a thick plate-like striking surface portion 911.

  A male screw 912 that can be screwed into the female screw 511 of the drifter rod 51 of the tool boom 50 is formed on the base end side (left end side in the drawing) of the outer peripheral surface of the holder 91. Due to the screwing, the drifter rod 51 and the center axis of the holder 91 coincide with each other. The holder 91 vibrates along the central axis direction of the holder 91 (normal direction of the striking surface portion 911) by the striking force from the drifter unit 52, and the central axis of the holder 91 (striking force by the rotational force from the drifter unit 52). The surface portion 911 is rotatable about the axis in the normal direction).

  The striking surface portion 911 is a surface portion that faces the cylindrical sleeve brick and applies a striking force to the sleeve brick along the cylindrical axial direction. The outer peripheral end portion 913 of the hitting surface portion 911 is formed in a planar shape substantially orthogonal to the axial direction of the holder 91, and a concave surface portion 914 that is recessed in a dish shape is formed inside the outer peripheral end portion 913 (substantially the center of the hitting surface portion 911). Is formed.

  Further, as shown in FIG. 4, a plurality of discharge groove portions 915 that spread radially are formed in the striking surface portion 911. The holder 91 is provided with a side surface portion 916 that is substantially orthogonal to the outer peripheral edge of the striking surface portion 911. A plurality of discharge groove portions 917 along the axial direction of the holder 91 are formed on the side surface portion 916 continuously with the discharge groove portion 915. A plurality of bit planting regions 918 are defined by these discharge grooves 915 and 917. Further, along the plurality of discharge groove portions 915 and 917, a crack piece of the sleeve brick generated at the time of drilling of the sleeve brick described later is discharged. In FIG. 4, the holder 91 has eight discharge groove portions 915 and 917 and eight bit planting regions 918, but the number of discharge groove portions and bit planting regions is as follows. It is not limited to this, Any number may be sufficient, and it is good also as a structure by which a discharge groove part is not provided.

  Further, in the plurality of bit planting regions 918 in the holder 91, refrigerant outlets 919 are formed at predetermined positions, respectively. The coolant outlet 919 communicates with the inside of the holder 91, and coolant such as cooling water supplied from the inner peripheral base end side of the holder 91 is supplied toward the striking surface portion 911. Thereby, the striking surface portion 911, the outer peripheral side bit 92, the inner peripheral side bit 93, and the side surface bit 94 are prevented from being destroyed by the high heat generated at the time of drilling the sleeve brick described later.

A specific configuration of the outer peripheral bit 92 will be described with reference to the drawings. FIG. 5 is a perspective view showing the outer peripheral side bit.
The outer peripheral side bit 92 is a bit that causes a crack in the sleeve brick by hitting, and a plurality of the outer peripheral side bits 92 are implanted on the outer peripheral end portion 913 side of each bit implantation region 918. Such an outer peripheral side bit 92 is made of, for example, a cemented carbide obtained by adding cobalt powder (Co) as a binder to tungsten carbide (WC), as shown in FIG. The tip side has a substantially wedge shape in which a ridge line portion 921 is formed at the tip. As a result, when the sleeve brick is drilled, a straight cut is formed in the sleeve brick at the ridgeline portion 921 in the wedge shape, and even if there is a bare metal between the sleeve brick and the converter, It can be crushed by cutting.

Furthermore, the ridge line portion 921 at the tip of the outer peripheral side bit 92 is flattened. In such an outer peripheral side bit 92, for example, when the diameter A1 on the base end side of the outer peripheral side bit 92 is about 15 mm, the width dimension A2 of the ridge line portion 921 is preferably about 2 to 3 mm. For example, when the diameter A1 on the base end side of the outer peripheral side bit 92 is relatively large and is about 20 mm, the width dimension A2 of the ridge line portion 921 is preferably about 7 to 8 mm. That is, it is preferable that the ratio (A2 / A1) of the width dimension A2 of the ridge line portion 921 to the diameter A1 on the base end side of the outer peripheral side bit 92 is 0.1 to 0.4.
With such dimensions, when the sleeve brick described later is drilled, the contact area between the ridgeline portion 921 at the tip of the outer peripheral side bit 92 and the sleeve brick becomes large, and the impact is once applied to the contact portion of the sleeve brick. A plurality of cracks can be generated by the operation.
When the ratio A2 / A1 is smaller than 0.1, the ridge line portion 921 at the tip of the outer peripheral bit 92 is sharp, and the contact area between the ridge line portion 921 at the tip of the outer peripheral bit 92 and the sleeve brick becomes small. Therefore, only one crack can be generated by a single impact operation on the contact portion of the sleeve brick.
On the other hand, when the ratio A2 / A1 is larger than 0.4, the contact area between the ridgeline portion 921 at the tip of the outer peripheral side bit 92 and the sleeve brick is too large, and the sleeve brick cannot be favorably cracked. .

As shown in FIGS. 3 and 4, the outer peripheral side bit 92 is the outermost peripheral side bit 92 out of the plurality of bits provided on the outer peripheral end 913 side of each bit planting area 918. The outer peripheral side bit 92 inside is planted in a state substantially along the axial direction of the holder 91. Thereby, it becomes possible to make a crack favorable in a sleeve brick.
Further, these outer peripheral side bits 92 are arranged so that the ridge line portion 921 follows the rotational tangent direction of the holder 91. Thereby, at the time of drilling the sleeve brick, which will be described later, the inner peripheral surface of the cylindrical sleeve brick is cut along the circumferential direction of the sleeve brick by the outer peripheral side bit 92 so that the cutting efficiency of the sleeve brick is improved. It has become.

A specific configuration of the inner peripheral side bit 93 will be described with reference to the drawings. FIG. 6 is a perspective view showing the inner peripheral side bit.
The inner peripheral side bit 93 is a bit for pushing the crack piece of the sleeve brick generated by the hitting of the outer peripheral side bit 92 into the central side of the concave surface portion 914, and the plurality of outer peripheral side bits 92 in the respective bit planting regions 918 are provided. A plurality of them are planted inside and on the outer peripheral end side of the concave surface portion 914. With such an arrangement, the distal end of the inner peripheral side bit 93 is positioned closer to the proximal end side of the holder 91 than the distal end of the outer peripheral side bit 92. As a result, the crack piece of the sleeve brick generated by striking the outer peripheral side bit 92 is inclined toward the center side of the concave surface portion 914, and the inner peripheral side bit 93 further directs the crack piece toward the central side of the concave surface portion 914. Can be pushed in.

  Such an inner peripheral side bit 93 is, for example, a cemented carbide obtained by adding cobalt powder (Co) as a binder to tungsten carbide (WC), and the base end side is formed in a substantially cylindrical shape as shown in FIG. In addition, the tip side is formed in a truncated cone shape, and the tip of the inner peripheral side bit 93 is flattened. In such an inner peripheral side bit 93, the ratio (B2 / B1) of the distal end diameter B2 to the proximal end side diameter B1 of the inner peripheral side bit 93 is 0.1 as in the case of the outer peripheral side bit 92. It is preferable to be set to ˜0.4.

A specific configuration of the side bit 94 will be described with reference to the drawings. FIG. 7 is a perspective view showing a side bit.
As shown in FIGS. 3 and 4, one side bit 94 is planted one by one on the side surface portion 916 in each bit planting region 918. Such a side bit 94 is made of, for example, a cemented carbide obtained by adding cobalt powder (Co) as a binder to tungsten carbide (WC), and the base end side is formed in a substantially prismatic shape as shown in FIG. The distal end side is formed in a substantially wedge shape in which the ridge line portion 941 extends in the axial direction of the holder 91 (normal direction of the striking surface portion 911). Thereby, even when a bare metal exists between the sleeve brick and the converter when drilling the sleeve brick, which will be described later, since the metal is cut into the bare metal along the axial direction of the sleeve brick, the axial movement of the holder 91 is prevented. It functions as a guide. Further, the side surface portion 916 of the holder 91 is prevented from being worn out by friction with the metal base and the sleeve brick.

  Here, the planting portion of the outer peripheral side bit 92, the inner peripheral side bit 93, and the side surface bit 94 in the holder 91 will be described with reference to the drawings. FIG. 8 is a side sectional view schematically showing the bit planting portion. In FIG. 8, only the planting portion of the inner peripheral side bit 93 is illustrated, but the configuration of the planting portion of the outer peripheral side bit 92 and the side surface bit 94 is the same.

  In FIG. 8, the holder 91 is formed with a planting hole 931 in which the inner peripheral side bit 93 is planted, and a tapered hole 932 that is widened around the planting hole 931. The inner peripheral side bit 93 is fixed by being inserted into the planting hole 931 and filling the tapered hole 932 with the weld metal 933 by welding. Thereby, the fixed state with respect to the holder 91 of each bit becomes stable. For this reason, the inner peripheral side bit 93 can be used without being damaged even in a temperature environment of 800 to 1000 ° C.

(1-3) Replacement work of sleeve brick in the steel outlet hole of the converter Next, the work of exchanging the sleeve brick in the steel outlet hole of the converter hot using the exchange device 1 will be described based on the drawings. To do. FIG. 9 is a flowchart for explaining a method of replacing the sleeve brick of the steel output hole. FIG. 10 is a side cross-sectional view schematically showing a converter and an exchanging device for drilling a sleeve brick of a steel outlet hole in the converter.

The operation | work which replaces the sleeve brick of the steel outlet hole in a converter is implemented through the process shown below. First, as shown in FIG. 10, the moving unit 12 is driven to place the exchange device 1 at a predetermined position before the converter T (step S101).
Next, the guard 141 of the protective roof 14 is advanced toward the converter T (step S102).
Then, the work deck 13 is moved up and down to secure the operator's footing (step S103).

  Thereafter, centering is performed by irradiating the laser beam with the centering device 70 so as to coincide with the cylindrical axis of the sleeve brick S to be replaced (step S104). Specifically, while irradiating a laser beam with the centering device 70, a traverse operation by the traverse base 20, a swivel operation by the swivel table 30, and a tilt / lift operation by the tilt frame 40 are performed, and the axis of the laser beam Is aligned with the axis of the sleeve brick S. In conjunction with this, the tool boom 50 and the sleeve boom 60 are traversed, swiveled, tilted, and moved up and down, and the posture is adjusted, that is, the tool boom 50 and the sleeve boom 60 (see FIG. 1 and FIG. 2) is aligned with the axis of the sleeve brick S.

After the centering is completed, the traverse base 20 is traversed to align the axis of the tool boom 50 with the axis of the sleeve brick S (step S105).
Then, the drifter unit 52 (see FIG. 1) is driven to apply a striking force and a rotational force to the drilling tool 90, and the tool boom cylinder 54 (see FIG. 1) is driven to advance the drilling tool 90. Drilling of the sleeve brick S is started.
In the initial stage of drilling, the sleeve brick S is drilled by hitting and rotating the drilling tool 90 (step S106). That is, the cutting is performed in a state in which the inner peripheral surface of the sleeve brick S is enlarged mainly by hitting the drilling tool 90.
From the final stage of drilling to the time of penetration, the frequency of striking the drilling tool 90 is reduced, and the drilling tool 90 is repeatedly advanced and retracted mainly by the rotation to drill the sleeve brick S (step S107). The drilling operation of the sleeve brick S in steps S106 and S107 will be described in detail later.

When the drilling operation of the sleeve brick S is completed, the tool boom cylinder 54 is driven to extract the drilling tool 90 from the steel outlet hole T1 (step S108).
Thereafter, the replacement sleeve brick S is mounted on the sleeve support 61 (see FIG. 2) of the sleeve boom 60, and the traverse base 20 is traversed so that the sleeve boom 60 faces the hole after drilling (step S109). .
Further, the sleeve boom cylinder 63 is advanced to insert the replacement sleeve brick S into the hole (step S110).

After the sleeve brick S is inserted, the sleeve boom cylinder 63 is retracted to extract the sleeve support 61, and the guard 141 and the work deck 13 of the protective roof 14 are retracted from the converter T (step S111).
And the moving part 12 is driven and the replacement | exchange apparatus 1 is moved (step S112), and the replacement | exchange operation | work of the sleeve brick S in a series of outgoing steel holes T1 is complete | finished.

(1-4) Drilling operation of sleeve brick The drilling operation of the sleeve brick S in steps S106 and S107 in FIG. 9 will be described based on the drawings. FIG. 11 is a side sectional view schematically showing the drilling operation of the drilling tool.

Generally, the steel tapping hole T1 (see FIG. 10) of the converter T is a circular hole penetrating from the inside to the outside of the converter T with a constant diameter, and the sleeve brick S included in the steel tapping hole T1. Is formed in a cylindrical shape as shown in FIG. And by the repeated use of the converter T, the melt enters between the one end side of the sleeve brick S facing the inside of the converter T and the steel output hole T1 facing this, and the main component is An iron ingot J is formed.
In order to shorten the operation stop time of the converter T, the sleeve brick S is preferably drilled in a high temperature state of about 1000 ° C. in which the temperature of the converter T is slightly lower than that during operation.
Further, when the sleeve brick S is newly replaced, it is necessary to remove all of the sleeve brick S and the bare metal J. The removal of the sleeve brick S is performed by cutting and removing the whole with the drilling tool 90, or by cutting the inner peripheral surface with the drilling tool 90 so that the inner peripheral surface is enlarged and the operator deleting the remaining part with a breaker or the like.

  In the initial stage of drilling in step S106 in FIG. 9, one end side (left side in FIG. 11) of the sleeve brick S is cut. In this case, the sleeve brick S is cut by applying a striking force mainly with the drilling tool 90 to the one end side of the brick material in the sleeve brick S and rotating the drilling tool 90 gently.

Specifically, a plurality of cracks are generated in the sleeve brick S at each outer peripheral bit 92 by hitting the drilling tool 90, and the sleeve brick generated by hitting the outer peripheral bit 92 at the inner peripheral bit 93. The crack piece S1 of S is pushed into the center side of the concave surface portion 914. The crushed crack piece S1 is discharged into the front converter T or through the discharge grooves 915 and 917 to the outside of the rear converter T, and the crushed crack piece S1 crushes the sleeve brick S. It is less likely to be pushed again into the part that is doing.
Thereby, the shaft runout of the drilling tool 90 at the time of drilling is reduced, and the drilling time of the sleeve brick is shortened as compared with the conventional configuration in which drilling is performed mainly by the rotational force.
Further, during drilling, each part of the drilling tool 90 receives little damage from the sleeve brick S, so there is almost no damage to the drilling tool 90 itself or damage on the exchange device 1 side. In particular, even when the converter is in a high temperature state (for example, 1000 ° C.), the outer peripheral side bit 92, the inner peripheral side bit 93, and the side bit 94 are attached to the holder 91 by the planting method shown in FIG. Even in the high temperature environment, the cutting ability of the drilling tool 90 does not drop without falling off.

  Since one end side (the right side in FIG. 11) of the sleeve brick S is cut from the end of drilling in Step S107 in FIG. 9 to the time of penetration, both the brick-like sleeve brick S and the bare metal J are cut simultaneously. There must be. In this case, both the sleeve brick S and the bare metal J are cut by reducing the frequency of hitting the drilling tool 90 and repeatedly moving the drilling tool 90 forward and backward with a rotating body.

  Here, the bare metal J exhibits an elastic-plastic deformation behavior, unlike a sleeve brick S in which cracking occurs and fracture proceeds during drilling. In particular, since the converter is in a high temperature state (for example, 1000 ° C.), even if the amount of plastic deformation of the metal J is large, the material is in a highly viscous state where the material does not break. For this reason, cutting progresses favorably by applying rotational force with the drilling tool 90 and repeatedly moving the drilling tool 90 forward and backward. On the other hand, even if the striking force is mainly applied by the drilling tool 90, the cutting of the metal bar J does not proceed.

  At this time, since the outer peripheral side bit 92 has a substantially wedge shape with a ridge line portion 921 formed at the tip, the outer peripheral side bit 92 cuts into the metal bar J as the holder 91 rotates, and the entire drilling tool 90 is pivoted. Cutting of the bullion J proceeds without blurring. Further, the side bit 94 functions as a guide that cuts into the base metal J along the axial direction of the sleeve brick S to prevent the shaft 91 from shaking. Thereby, the sleeve brick S can be cut and removed with high accuracy.

(1-5) Effect of Drilling Tool, Sleeve Brick Replacement Device and Replacement Method According to the drilling tool 90, replacement device 1, and sleeve brick replacement method in the first embodiment, the following effects can be achieved. .

(1-5-1) The drilling tool 90 includes a holder 91, a plurality of outer peripheral bits 92, and a plurality of inner peripheral bits 93. The holder 91 has a striking surface portion 911 for striking a cylindrical sleeve brick along the cylindrical axial direction, and a concave surface portion 914 is formed at the approximate center of the striking surface portion 911. The outer peripheral side bit 92 is planted at the outer peripheral end portion 913 of the striking surface portion 911, and the sleeve brick is cracked by striking. The inner peripheral side bit 93 is planted on the inner side of the plurality of outer peripheral side bits 92 and on the outer peripheral end side of the concave surface portion 914, and the crack piece S1 of the sleeve brick generated by the impact of the outer peripheral side bit 92 is centered on the concave surface portion 914. Push to the side.
As a result, the crack piece S1 once crushed is less likely to be pushed again into the portion where the sleeve brick S is being crushed. For this reason, the shaft runout of the drilling tool 90 is reduced, and the sleeve brick S can be drilled with high accuracy. Further, the outer peripheral side bit 92 and the inner peripheral side bit 93 have separate functions for cutting and extruding the sleeve brick S, and the crack piece S1 once crushed does not become an obstacle to cutting. Smooth cutting without receiving external force. As a result, the sleeve brick S can be drilled quickly, and damage to each part of the drilling tool 90 can be reduced as much as possible. For this reason, the lifetime of the drilling tool 90 can be extended, and the number of replacements of the drilling tool 90 can be reduced. Furthermore, since the load on the apparatus side that applies a striking force to the drilling tool 90 such as the drifter unit 52 can be reduced, the life of the replacement apparatus 1 can be extended. Further, since the time required for drilling can be shortened, the entire work time can be shortened when replacing the sleeve brick S. Thereby, since the period for which the operation of the converter is stopped in order to replace the sleeve brick can be shortened, a long operation time of the converter can be secured as a result.
The crushed crack piece S1 is discharged into the front converter T or through the discharge grooves 915 and 917 to the outside of the rear converter T.

(1-5-2) The tips of the outer peripheral side bit 92 and the inner peripheral side bit 93 are flattened.
As a result, when the sleeve brick is drilled, the contact area between the tip of each bit and the sleeve brick becomes large, and a plurality of cracks can be generated in one impact operation on the contact portion of the sleeve brick. For this reason, it can prevent that the front-end | tip part of each of the outer peripheral side bit 92 and the inner peripheral side bit 93 wears out early, and can improve a drilling speed. Therefore, the lifetime of the drilling tool 90 can be extended and the working time can be shortened. As a result, the period during which the operation of the converter is stopped in order to replace the sleeve brick is shortened, and a long operation time of the converter can be ensured.

(1-5-3) The outer peripheral side bit 92 has a substantially wedge shape with a ridge line portion 921 formed at the tip.
As a result, when the sleeve brick is drilled, a straight cut is formed in the sleeve brick at the ridgeline portion 921 in the wedge shape, and even if there is a bare metal between the sleeve brick and the converter, Can be cut and crushed. For this reason, the drilling speed of the sleeve brick can be improved, and precise drilling can be realized without causing the drilling tool 90 to shake. And since the operator does not need to perform a removal operation | work with a breaker separately with respect to the metal which remained after removing a sleeve brick like the past, work time can be reduced significantly.

(1-5-4) The holder 91 rotates around the axis in the normal direction of the striking surface portion 911, and the outer peripheral side bit 92 is arranged so that the ridgeline portion 921 follows the rotational tangential direction of the holder 91. .
Thereby, at the time of drilling the sleeve brick, the inner peripheral surface of the cylindrical sleeve brick can be cut along the circumferential direction of the sleeve brick by the outer peripheral side bit 92, and the cutting efficiency of the sleeve brick can be further improved.

(1-5-5) The holder 91 has a side surface portion 916 that intersects with the outer peripheral edge of the striking surface portion 911. The side surface portion 916 has a substantially wedge shape in which a ridge line portion 941 extends in the normal direction of the striking surface portion 911. Side bit 94 is planted.
As a result, even when there is a bare metal between the sleeve brick and the converter when the sleeve brick is drilled, the side bit 94 cuts into the bare metal along the axial direction of the sleeve brick. Can be prevented. For this reason, the precision of perforation can be improved. Further, it is possible to prevent the side surface portion 916 of the holder 91 from being worn by the side bit 94 due to friction with the metal base and the sleeve brick. For this reason, the lifetime of the drilling tool 90 can be further extended.

(1-5-6) At least one of the outer peripheral side bit 92, the inner peripheral side bit 93, and the side surface bit 94 is a taper formed so as to expand around the planting hole 931 in which the bit is planted. The hole 932 is filled and fixed with a weld metal 933 by welding.
Thereby, the favorable adhering state with respect to the holder 91 of each bit can be obtained even at high temperature. In particular, by using a cemented carbide obtained by adding cobalt powder (Co) as a binder to tungsten carbide (WC) as a material of each bit, a good fixing state can be obtained even in a temperature environment of 800 to 1000 ° C. . For this reason, it can be repeatedly used without being damaged even in a high temperature environment. Further, since the sleeve brick and the metal are in a fragile state in a high temperature environment, and the fixing state of each bit is stable, the drilling operation can be performed with high efficiency. Therefore, the lifetime of the drilling tool 90 can be extended and the working time can be shortened.

(1-5-7) The exchange device 1 includes a carriage 10, a traverse base 20, a turning table 30, a tilting frame 40, a tool boom 50, and a sleeve boom 60. The tool boom 50 is provided with a tool boom cylinder 54 to which the drilling tool 90 is attached to move the drilling tool 90 forward and backward, and a drifter unit 52 that applies vibration force and rotational force to the drilling tool 90. . The sleeve boom 60 includes a sleeve support 61 that holds the replacement sleeve brick S at the tip, a sleeve insertion frame 62 to which the sleeve support 61 is attached, and a sleeve boom that moves the sleeve insertion frame 62 forward and backward. A cylinder 63 is provided.
Thus, since the tool boom 50 and the sleeve boom 60 are provided on the tilting frame 40, for example, once the tool boom 50 is centered, it is not necessary to center again with the sleeve boom 60, so that the work time is shortened. it can.
Moreover, the operator can remove the high temperature sleeve brick after completion of steel production with high speed and high accuracy by the drilling tool 90 without crushing and removing it with a separate breaker. A sleeve brick can be inserted. For this reason, a sleeve brick can be replaced | exchanged easily and rapidly, and it can prevent that the operating rate of a furnace reduces. Furthermore, since it is not necessary for the operator to directly replace the sleeve bricks in the converter in a high temperature state as in the prior art, the safety of the operator can be ensured.
Since the drilling tool 90 does not receive an extra external force from the sleeve brick side, the load on the drifter unit 52 that gives a striking force to the drilling tool 90 can be reduced, and therefore the life of the exchange device 1 can be extended.

(1-5-8) A work deck 13 that is extendable in the moving direction of the carriage 10 and movable in the vertical direction is provided in front and below the carriage 10.
As a result, in the replacement work of the sleeve bricks, it is possible to secure the operator's footing and to adjust the work position to a suitable position according to the work situation. In particular, when working on a molten metal container such as a converter disposed in a cliff-shaped space, the exchanging device 1 is arranged up to the cliff-shaped ground edge and the work deck 13 is extended, Even when there is no ground, it is possible to secure a foothold for the worker.

(1-5-9) A protective roof 14 projecting toward the front of the carriage 10 is provided in front of and above the carriage 10, and can extend and contract in the moving direction of the carriage 10 in front of the protective roof. A guard 141 is provided.
Thereby, in the replacement work of the sleeve brick, the operator can be protected from the fallen object from the upper part. Therefore, it is possible to ensure the safety of the worker who is working.

(1-5-10) A hoist 15 capable of traversing in a direction orthogonal to the moving direction of the carriage 10 is provided in front of and below the protective roof 14.
As a result, the hoist 15 is hung a converter jig or the like to be moved on the hook 151 and moved to the place where it does not interfere with the operator's work by moving the jig up and down and left and right. Thus, the replacement work can be performed smoothly.

(1-5-11) The exchanging device 1 includes a centering device 70 that irradiates a beam for centering parallel to each axis on the surfaces including the respective axis centers of the tool boom 50 and the sleeve boom 60. ing. The centering device 70 allows the work to be performed while visually confirming the position of the core, so that centering can be performed with high accuracy.
As a result, the sleeve brick can be drilled with high accuracy, and a new sleeve brick can be accurately inserted into the hole formed after drilling. In particular, if the beam axis is made to coincide with the axis of the sleeve brick, the axis of each of the tool boom 50 and the sleeve boom 60 can be made to coincide with the axis of the sleeve brick simply by sliding the traverse frame 20. The replacement operation of the sleeve brick can be performed quickly and easily.

(1-5-12) The cylindrical sleeve brick S forming the steel outlet hole T1 in the converter T is exchanged hot. Specifically, the tool boom 50 is adjusted in posture by irradiating with a light beam so as to coincide with the axis of the sleeve brick S. In the initial stage, the sleeve brick S is drilled by striking and rotating the drilling tool 90, the frequency of striking the drilling tool 90 is reduced from the final stage to the time of penetration, and the drilling tool 90 is repeatedly advanced and retracted mainly by the rotation. The sleeve brick S is perforated. Further, the traverse base 20 is traversed so that the sleeve boom 60 faces the hole after drilling, and the replacement sleeve brick S is inserted.
As a result, the sleeve brick S can be cut at high speed in the initial stage of drilling due to heat, and both the sleeve brick S and the metal J can be cut from the final stage of drilling to the time of penetration. In particular, even when cutting an irregularly shaped metal bar J, the drilling tool 90 can perform cutting with high accuracy without causing shaft shake. In this way, the final stage does not become a bottleneck as in conventional work, and there is no need for crushing and removal with a separate breaker. Therefore, the drilling of the sleeve brick can be performed at one time without avoiding the metal bar J with a single drilling tool 90, so there is no time loss and high efficiency. As a result, a long converter operation time is ensured. can do.

(2) Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The sleeve brick replacement device according to this embodiment is different from the first embodiment only in the configuration of the drilling tool 90, and the other configurations are the same. For this reason, description and illustration of the same configuration will be omitted as appropriate.

(2-1) Configuration of Drilling Tool 90A A specific configuration of the drilling tool 90A will be described with reference to the drawings. FIG. 12 is a side sectional view showing the drilling tool in the present embodiment, and FIG. 13 is a plan view thereof.

  The drilling tool 90A is a tool for drilling and removing a cylindrical sleeve brick at the tuyere penetrating the inside and outside of the converter. As shown in FIG. 12, the drilling tool 90A includes a holder 91A, a plurality of outer peripheral bits 92A, a plurality of inner peripheral bits 93A, a plurality of side bits 94A, and an annular member 95.

The holder 91A is formed in a substantially cylindrical shape as shown in FIG. 12, and has a cylindrical tip (right end in the drawing) having a large diameter, and the tip is a thick plate-shaped striking surface 911A. It has a closed shape.
A male screw 912A that can be screwed into the female screw 511 of the drifter rod 51 in the tool boom 50 is formed on the base end side (the left end side in the drawing) of the outer peripheral surface of the holder 91A.

  The striking surface portion 911A is a surface portion that faces the cylindrical sleeve brick and applies a striking force to the sleeve brick along the cylindrical axial direction. The outer peripheral end portion 913A of the hitting surface portion 911A is chamfered to be a tapered surface that intersects the axial direction of the holder 91A. A concave surface portion 914A that is recessed in a dish shape is formed inside the outer peripheral end portion 913A (substantially the center of the striking surface portion 911A).

  Further, the holder 91A is provided with a side surface portion 916A that is substantially orthogonal to the outer peripheral edge of the striking surface portion 911A. A plurality of discharge groove portions 917A along the axial direction of the holder 91A are formed on the side surface portion 916A. Along the discharge groove portion 917A, a crack piece of the sleeve brick that is generated when the sleeve brick described later is drilled is discharged.

  Furthermore, a coolant outlet 919A is formed at a predetermined position on the striking surface portion 911A of the holder 91A. The coolant jet 919A communicates with the inside of the holder 91A, and coolant such as cooling water supplied from the inner peripheral base end side of the holder 91A is supplied toward the striking surface portion 911A. Thereby, the striking surface portion 911A, the outer peripheral side bit 92A, the inner peripheral side bit 93A, and the side surface bit 94A are prevented from being destroyed by the high heat generated at the time of drilling the sleeve brick described later.

  The outer peripheral side bit 92A is a bit that causes the sleeve brick to crack by hitting, and as shown in FIGS. 12 and 13, a plurality of the outer peripheral side bits 92A are implanted on the outer peripheral end side of the outer peripheral end portion 913A and the concave surface portion 914A. Out of these outer peripheral side bits 92A, the outer peripheral side bit 92A planted on the outer peripheral end 913A is planted in a state of opening outward, and the outer peripheral planted on the outer peripheral end side of the concave surface portion 914A. The side bit 92A is implanted in a state substantially along the axial direction of the holder 91A. As a result, when the sleeve brick described later is drilled, the sleeve brick can be favorably cracked.

Further, the outer peripheral side bit 92A is formed in a substantially columnar shape as shown in FIG. 5, and the columnar tip side has a substantially wedge shape in which a ridge line portion 921 is formed at the tip. The outer peripheral side bit 92A is arranged so that the ridgeline portion 921 follows the rotational tangent direction of the holder 91A.
The outer peripheral bit 92A is formed of the same material and shape as the outer peripheral bit 92 in the first embodiment shown in FIG.

The inner peripheral side bit 93A is a bit that pushes a crack piece of the sleeve brick generated by striking the outer peripheral side bit 92A into the central side of the concave surface portion 914A. As shown in FIGS. And a plurality of concave portions 914A. Particularly, the inner peripheral side bit 93A is provided up to the center side of the concave surface portion 914A so as to correspond to the thick sleeve brick at the tuyere.
With such an arrangement, the distal end of the inner peripheral side bit 93A is positioned closer to the proximal end side of the holder 91A than the distal end of the outer peripheral side bit 92A. Thereby, it becomes possible to push in the crack piece of the sleeve brick produced by the hit | damage of the outer peripheral side bit 92A toward the center side of the concave-surface part 914A.
The inner peripheral side bit 93A is formed of the same material and substantially the same shape as the inner peripheral side bit 93 in the first embodiment shown in FIG.

As shown in FIGS. 12 and 13, a plurality of side bits 94 </ b> A are implanted from the side surface portion 916 </ b> A to the outer peripheral end portion 913 </ b> A. The side bit 94A is formed in a substantially prismatic shape as shown in FIG. 7, and the end of the prismatic shape is formed in a substantially wedge shape with a ridge line portion extending in the axial direction of the holder 91A (normal direction of the striking surface portion 911A). ing.
The inner peripheral side bit 93A is formed of the same material as the inner peripheral side bit 93 in the first embodiment shown in FIG.
The configuration of the planted portion of the outer peripheral side bit 92A, the inner peripheral side bit 93A, and the side surface bit 94A is the same as the configuration of the planted portion shown in FIG. 8 in the first embodiment.

  The annular member 95 is formed in an annular shape with a metal material or the like, and is provided in a loosely fitted state with respect to the holder 91 on the striking base end side (left end side in FIG. 12) of the holder 91. On the outer peripheral surface of the annular member 95, a plurality of cutting blades 951 are provided at predetermined intervals so that the cutting edge extends along the axial direction (striking direction) of the holder 91 and cleaves the remaining sleeve brick. Thereby, the remaining sleeve brick can be suitably crushed at the time of drilling the sleeve brick described later. In FIG. 13, four cleaving blades 951 are provided. However, the number is not limited to this, and any number may be used as long as it is two or more.

(2-2) Sleeve brick replacement work at converter tuyeres Next, the work of exchanging the sleeve bricks at the tuyeres of the converter hot using the exchange device 1 will be described with reference to the drawings. FIG. 14 is a flowchart for explaining a method for replacing tuyere sleeve bricks. FIG. 15 is a side cross-sectional view schematically showing a converter and an exchanging apparatus for drilling a tuyered sleeve brick in the converter.

The operation | work which replaces the sleeve brick of the tuyere T2 in the converter T is implemented through the process shown below. First, as shown in FIG. 15, the moving unit 12 is driven to place the exchange device 1 at a predetermined position before the converter T (step S201).
Next, the guard 141 of the protective roof 14 is extended to a position close to the outer surface of the converter T (step S202). Then, the work deck 13 is moved up and down to secure the operator's footing (step S203). In this way, the work environment of the worker is ensured.

Thereafter, members provided at the bottom of the converter T, for example, a furnace bottom cover, piping, and a sleeve receiver are removed, and these are carried out by the hoist 15 (step S204).
After unloading the bottom member, centering is performed by irradiating a laser beam with the centering device 70 so as to coincide with the cylindrical axis of the sleeve brick S to be replaced (step S205).
After centering, the traverse base 20 is traversed to align the axis of the tool boom 50 with the axis of the sleeve brick S (step S206).
Then, the drifter unit 52 (see FIG. 1) is driven to apply a striking force and a rotational force to the drilling tool 90A, and the tool boom cylinder 54 (see FIG. 1) is driven to advance the drilling tool 90A. The sleeve brick S is drilled (step S207). Further, the drilling tool 90A is advanced to drill the remaining in-container such as slag accumulated at the bottom of the converter T (step S208). The punching operation in steps S207 and S208 will be described in detail later.

When the drilling operation of the sleeve brick S is completed, the tool boom cylinder 54 is driven to extract the drilling tool 90A from the tuyere T2 (step S209).
Thereafter, the replacement sleeve brick S is mounted on the sleeve support 61 (see FIG. 2) of the sleeve boom 60, and the traverse base 20 is traversed so that the sleeve boom 60 faces the hole after drilling (step S210). .
Further, the sleeve boom cylinder 63 is advanced to insert the replacement sleeve brick S into the hole (step S211). Then, the sleeve boom cylinder 63 is retracted and the sleeve support 61 is extracted.

  Here, when a plurality of tuyere T2 is provided at the bottom of the converter T, it is determined whether or not the sleeve brick to be replaced still remains (step S212), and the sleeve brick to be replaced is determined. If still remains, the process of step S205 is performed. In this case, it is preferable that the work deck 13 is appropriately raised and lowered to a position where the worker can easily perform work to secure the worker's scaffold.

On the other hand, if no sleeve bricks to be replaced remain in step S212, a furnace bottom cover, piping, sleeve metal fitting, etc. at the bottom of the converter T are attached using the hoist 15 (step S213). Then, the guard 141 and the work deck 13 of the protective roof 14 are retracted from the converter T (step S214).
Thereafter, the moving unit 12 is driven to move the exchange device 1 (step S215), and the replacement work of the sleeve brick S in the series of tuyere T2 is completed.

(2-3) Drilling operation of sleeve brick The drilling operation of steps S207 and S208 in FIG. 14 will be described based on the drawings. FIG. 16 is a side sectional view schematically showing a drilling operation by the drilling tool 90A.

Generally, the tuyere T2 of the converter T is a circular hole formed so as to penetrate from the outer side to the inner side of the converter in a tapered shape with a gradually decreasing diameter from the outer side to the inner side of the converter. A plurality of such tuyere T2 is usually provided at the bottom of the converter T, and oxygen and other gases are introduced into the converter T through these tuyere T2.
The sleeve brick S contained in the tuyere T2 has a substantially cylindrical shape as shown in FIG. 16, and the outer peripheral surface thereof is formed in a tapered shape that gradually decreases in diameter from one end side to the other end side. ing.
Further, in-container residue T3 such as slag generated during operation of converter T is usually stored and solidified at the furnace bottom inside converter T after use. Since the tuyere T2 is closed by the residual T3 in the container, when the sleeve brick S is newly replaced, all the sleeve brick S is cut and removed by the drilling tool 90A, and further inside the converter T. In order to enable the introduction of the gas, it is necessary to perforate and penetrate the container residue T3.
In order to shorten the operation stop time of the converter, the sleeve brick S is preferably drilled in a high temperature state of about 1000 ° C., in which the temperature of the converter is slightly lower than that during operation.

  Before drilling, as shown in FIG. 16A, the nozzle tube T4 is inserted into the sleeve brick S. Then, the nozzle tube T4 is pulled out by the operator, and the state shown in FIG. Note that both the sleeve brick S and the nozzle tube T4 may be cut and removed by the drilling tool 90A without pulling out the nozzle tube T4.

  Then, as shown in FIG. 16C, in the drilling stage of the sleeve brick S in step S207 in FIG. 14, a striking force is mainly applied to the sleeve brick S with the drilling tool 90A, and the drilling tool 90A is gently moved. Drilling holes by rotating.

Specifically, a plurality of cracks are generated in the sleeve brick S at each outer peripheral bit 92A by hitting the drilling tool 90A, and the sleeve brick generated by hitting the outer peripheral bit 92A at the inner peripheral bit 93A. The crack piece S1 of S is pushed into the center side of the concave surface portion 914A. In particular, since some of the plurality of inner peripheral side bits 93A are provided up to the center side of the concave surface portion 914A, the inner peripheral side of the thick sleeve brick S is cut by the inner peripheral side bit 93A. . The crushed crack piece S1 is discharged into the front converter T or through the discharge groove 917A to the outside of the rear converter T, and the crushed crack piece S1 crushes the sleeve brick S. It is less likely to be pushed into the part where it is.
Further, the plurality of cutting blades 951 of the annular member 95 are pierced into the sleeve brick S remaining after being cut by the outer peripheral side bit 92A and the inner peripheral side bit 93A. Since the annular member 95 is provided in a loosely fitted state with respect to the holder 91, the annular member 95 does not rotate even when the holder 91 rotates, and only the striking force from the drifter unit 52 is applied to the sleeve brick S. Communicate to the rest. Thereby, the remaining part of the sleeve brick S is vertically cut along the axial direction of the sleeve brick S by the plurality of cutting blades 951. As described above, it is possible to efficiently punch and remove the thick sleeve brick S formed in a tapered shape in a short time.

After passing through the sleeve brick S, the drilling tool 90A reaches the in-container residue T3. Then, as shown in FIG. 16B, in the drilling stage of the in-container residue T3 in step S208 in FIG. 14, a striking force is mainly applied to the in-container residue T3 with the drilling tool 90A. By rotating 90A, the in-container residue T3 is perforated.
In this case, the converter T is in a high temperature state (for example, 1000 ° C.), and the in-container residue T3 needs to be relatively soft, and the drilling tool 90A is effective against the in-container residue T3 in such a state. It works. Since the outer peripheral side bit 92A, the inner peripheral side bit 93A, and the side surface bit 94A are attached to the holder 91A by the planting method shown in FIG. 8, the cutting ability of the drilling tool 90A does not fall out even in the high temperature environment. There is no decline.

(2-4) Effect of Drilling Tool 90A, Sleeve Brick Replacement Device and Replacement Method According to the drill tool 90A, replacement device 1 and sleeve brick replacement method in the first embodiment, the above (1-5-1) In addition to the effects shown in (1-5-11), the following effects can be obtained.

(2-4-1) The holder 91A rotates around the normal axis of the striking surface portion 911A, and an annular member 95 is provided on the striking proximal end side of the holder 91A in a loosely fitted state with respect to the holder 91A. It has been. A cutting edge 951 is provided on the outer peripheral surface of the annular member 95 so that the cutting edge extends along the striking direction and cleaves the remaining sleeve brick.
Here, in the drilling operation by the drilling tool 90A, the plurality of cutting blades 951 of the annular member 95 pierce the sleeve brick S remaining after being cut by the outer peripheral side bit 92A and the inner peripheral side bit 93A. Since the annular member 95 is provided in a loosely fitted state with respect to the holder 91, the annular member 95 does not rotate even when the holder 91 rotates, and only the striking force from the drifter unit 52 is applied to the sleeve brick S. Communicate to the rest. Thereby, the remaining part of the sleeve brick S can be vertically cut along the axial direction of the sleeve brick S by the plurality of cutting blades 951. Therefore, with respect to the sleeve brick S of the tuyere T2 whose outer peripheral surface is formed in a tapered shape, the operator does not remove the remaining portion of the sleeve brick S with a separate breaker or the like, all at once with the drilling tool 90A. Since it can be removed, the drilling operation can be performed quickly and with high efficiency.

(2-4-2) The tubular sleeve brick S forming the tuyere T2 in the converter T is exchanged hot. Specifically, the work environment is secured by extending the work deck 13 and the guard 141 of the protective roof 14 to a position close to the outer surface of the converter T. And the member provided in the bottom part of the converter is removed and it is carried out by the hoist 15. Furthermore, the attitude of the tool boom 50 is adjusted by irradiating with a light beam so as to coincide with the axial center of the sleeve brick S. Then, the sleeve brick S and the in-container residue T3 in the molten metal container are drilled by hitting and rotating the drilling tool 90A. Thereafter, the traverse base 20 is traversed so that the sleeve boom 60 faces the hole after drilling, and the replacement sleeve brick S is inserted.
Thereby, since the in-container residue T3 and the sleeve brick S remaining at the bottom of the converter T can be pierced by a single operation in a hot state, after the sleeve brick is pierced as in the conventional manner, Compared to a configuration in which the in-container residue T3 is crushed using a breaker or the like, it is very safe and the working efficiency can be greatly improved. Therefore, the replacement of the sleeve brick S at the tuyere T2 can be completed in a short time, and as a result, a long converter operation time can be secured.

(2-4-3) A part of the plurality of inner peripheral side bits 93A is provided to the center side of the concave surface portion 914A.
Thereby, since the inner peripheral side of the sleeve brick S can be cut by the inner peripheral side bit 93A, the sleeve brick S in the thick tuyere T2 can be suitably perforated.

(3) Modifications of Embodiments The present invention is not limited to the above-described embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved.

  That is, for example, in the above-described embodiment, the configuration in which the steel outlet hole of the converter or the sleeve brick of the tuyere is replaced using the drilling tool and the exchange device of the present invention is not limited thereto. That is, it is applicable to any molten metal container other than the converter as long as it is a cylindrical sleeve brick that forms a hole that penetrates the inside and outside of the molten metal container.

  In the embodiment, the tips of the outer peripheral bits 92 and 92A have a substantially wedge shape as shown in FIG. 5, and the tips of the inner peripheral bits 93 and 93A have a spindle shape as shown in FIG. That is, a bit having the same shape may be used for the outer peripheral side bit and the inner peripheral side bit. In this case, since the number of types of bits to be used is small, the drilling tool can be manufactured at low cost. Moreover, the shape of these bit tips may be any shape such as a conical shape or a pyramid shape. Further, the tips of the outer peripheral side bits 92 and 92A and the inner peripheral side bits 93 and 93A are flattened, but none of them are flattened, or only a part of the bits are flattened. Also good. Even in these cases, as in the above-described embodiment, the drilling tool can have a long life and the working time can be shortened.

  In the first embodiment, the outer peripheral side bit 92 is arranged so that the ridge line portion 921 follows the rotational tangent direction of the holder 91, but this is not restrictive. That is, for example, as in the drilling tool 90B shown in FIG. 17, the outer peripheral side bit 92 may be arranged so that the ridge line portion 921 follows the rotational radial direction of the holder 91. Here, FIG. 17 is a plan view showing a modified example of the drilling tool in the first embodiment, and has the same configuration as the drilling tool 90 of the first embodiment shown in FIG. 4 except for the direction of the ridgeline portion 921. Yes. According to such a drilling tool 90B, the effects (1-5-1) to (1-5-3), (1-5-5), and (1-5-6) of the first embodiment are used. In addition, the following effects can be achieved. That is, since the outer peripheral side bit 92 is arranged so that the ridgeline portion 921 follows the rotational diameter direction of the holder 91, when the sleeve brick is drilled, the outer peripheral side bit 92 causes the inner side of the cylindrical sleeve brick to be The peripheral surface can be cut along the radial direction of the sleeve brick, and the cutting efficiency of the sleeve brick can be further improved.

  In the above embodiment, the side bits 94 and 94A are provided on the drilling tools 90 and 90A. However, the side bits 94 and 94A may not be provided. In such a case, since the number of members is small, the drilling tool can be manufactured at low cost. Further, the shape and arrangement of the side bits 94 and 94A are not limited to those shown in FIGS.

  In the second embodiment, the annular member 95 is provided in the drilling tool 90A. However, the annular member 95 may be provided in the drilling tool 90 of the first embodiment.

It is a side view showing typically the exchange device of the sleeve brick concerning a 1st embodiment of the present invention. It is a top view which shows typically the replacement | exchange apparatus of the sleeve brick concerning the said embodiment. It is a sectional side view which shows the drilling tool in the said embodiment. It is a top view which shows the drilling tool in the said embodiment. It is a perspective view which shows the outer peripheral side bit in the said embodiment. It is a perspective view which shows the inner peripheral side bit in the said embodiment. It is a perspective view which shows the side bit in the said embodiment. It is a sectional side view which shows typically the planting part of the bit in the said embodiment. It is a flowchart for demonstrating the replacement | exchange method of the sleeve brick of the steel outlet hole in the said embodiment. It is a sectional side view which shows typically the converter in the said embodiment, and the exchange apparatus which drills the sleeve brick of the steel outlet hole in this converter. It is a sectional side view which shows typically the drilling operation | movement of the drilling tool in the said embodiment. It is a sectional side view which shows the drilling tool which concerns on 2nd Embodiment of this invention. It is a top view which shows the drilling tool in the said embodiment. It is a flowchart for demonstrating the replacement | exchange method of the tuyere sleeve brick in the said embodiment. It is a sectional side view which shows typically the converter in the said embodiment, and the exchange apparatus which pierces the sleeve brick of the tuyere in this converter. It is a side sectional view showing typically the drilling operation of the drilling tool in the embodiment, (A) is a state where the nozzle tube of the tuyere before drilling is mounted, (B) is the state of the tuyere before drilling The nozzle tube is removed, (C) is a state where a sleeve brick is perforated, and (D) is a state where a furnace residue is perforated. It is a top view which shows the modification of the drilling tool in the said 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Exchange apparatus 10 ... Carriage 11 ... Frame part 111 ... Bottom part 112 ... Supporting column 113 ... Ceiling part 12 ... Moving part 13 ... Work deck 14 ... Protective roof 141 ... Guard (front part)
15 ... Hoist (lifting device)
151 ... Hook 20 ... Traverse frame 21 ... Slide bearing 22 ... Slide shaft 23 ... Traverse cylinder 30 ... Turning table 31 ... Turning motor 40 ... Tilt frame 41 ... Main body 42, 43 ... Tilt pins 44, 45 ... Tilt cylinders 46, 47 ... Boom connecting rod 50 ... Tool boom 51 ... Drifter rod 52 ... Drifter unit 53 ... Drifter frame 54 ... Tool boom cylinder 60 ... Sleeve boom 61 ... Sleeve support 62 ... Sleeve insert frame 63 ... Sleeve boom cylinder 70 ... Centering Device 80 ... Drive source 81 ... Hydraulic pump 90, 90B ... Drilling tool 91 ... Holder 911 ... Hitting surface portion 912 ... Male screw 913 ... Outer peripheral edge portion 914 ... Concave surface portion 915 ... Discharge groove portion 916 ... Side portion 917 ... Discharge groove portion 918 ... Bit planting Installation area 919 ... refrigerant outlet 92 ... outer peripheral side bit 9 DESCRIPTION OF SYMBOLS 1 ... Edge line part 93 ... Inner peripheral side bit 931 ... Installation hole 932 ... Tapered hole 933 ... Weld metal 94 ... Side bit 941 ... Edge line part 90A ... Drilling tool 91A ... Holder 911A ... Impact surface part 912A ... Male screw 913A ... Outer peripheral edge part 914A ... concave surface portion 916A ... side surface portion 917A ... discharge groove portion 919A ... refrigerant outlet 92A ... outer peripheral side bit 93A ... inner peripheral side bit 94A ... side surface bit 95 ... annular member 951 ... cutting blade J ... bare metal S ... sleeve brick S1 ... Crack piece T ... Converter T1 ... Steel outlet hole T2 ... Tuna T3 ... Residue in container T4 ... Nozzle tube

Claims (15)

A drilling tool for removing a cylindrical sleeve brick that forms a hole penetrating the inside and outside of a molten metal container by perforating by striking,
A holder having a striking surface portion for striking the tubular sleeve brick along the tubular axial direction, and a concave portion formed in the approximate center of the striking surface portion;
A plurality of outer peripheral bits that are planted at the outer peripheral end of the striking surface portion and cause the sleeve brick to crack by striking;
Inside the plurality of outer peripheral bits and on the outer peripheral end side of the concave surface portion, a plurality of inner pieces are pressed into the center side of the concave portion of the crack piece of the sleeve brick caused by the hitting of the outer peripheral side bit. A drilling tool comprising a circumferential bit. The drilling tool according to claim 1, wherein
A tip of the outer peripheral side bit and the inner peripheral side bit is flattened. The drilling tool according to claim 1 or 2,
The outer peripheral side bit has a substantially wedge shape in which a ridge line portion is formed at a tip. The drilling tool according to claim 3,
The holder rotates around an axis in a normal direction of the striking surface portion,
The outer peripheral side bit is arranged so that the ridge line part follows the rotation tangent direction of the holder. The drilling tool according to claim 3,
The holder rotates around an axis in a normal direction of the striking surface portion,
The outer peripheral side bit is arranged so that the ridge line portion follows the rotational radial direction of the holder. The drilling tool according to any one of claims 1 to 5,
The holder has a side surface that intersects at the outer periphery of the striking surface portion,
A drilling tool characterized in that a substantially wedge-shaped side bit extending in a ridge line portion in the normal direction of the striking surface portion is planted on the side surface portion. The drilling tool according to any one of claims 1 to 6,
At least one of the outer peripheral side bit, the inner peripheral side bit, and the side surface bit is:
A drilling tool characterized in that a welded metal is filled in and fixed to a taper hole formed to expand around a planting hole in which the bit is implanted. The drilling tool according to any one of claims 1 to 7,
The holder rotates around an axis in a normal direction of the striking surface portion,
On the striking proximal end side of the holder, an annular member is provided in a loosely fitted state with respect to the holder,
A drilling tool characterized in that a cutting edge is provided on the outer peripheral surface of the annular member, and the cutting edge extends along the striking direction to cleave the remaining sleeve brick. A sleeve brick exchange device comprising the drilling tool according to any one of claims 1 to 8, wherein the sleeve brick is exchanged.
A carriage that moves back and forth outside the molten metal container;
On the carriage, a traverse base provided so as to traverse in a direction substantially orthogonal to the movement direction of the carriage,
A swivel table that is turnable on the traverse base;
A tilt frame provided to be tiltable above the swivel table;
A tool boom and a sleeve boom which are arranged in parallel to each other on the tilt frame and which can be moved up and down and tilted together are provided.
The tool boom is provided with a tool boom cylinder to which the drilling tool is attached to move the drilling tool forward and backward, and a drifter unit that applies vibration force and rotational force to the drilling tool,
The sleeve boom includes a sleeve support for holding a replacement sleeve brick at the end of the sleeve boom, a sleeve insertion frame to which the sleeve support is attached, and a sleeve boom for moving the sleeve insertion frame forward and backward. A cylinder,
The sleeve brick exchanging device, wherein the drilling tool and the sleeve support are movable in an arbitrary direction in a three-dimensional space. In the sleeve brick exchange device according to claim 9,
A sleeve brick exchanging device, characterized in that a work deck that is extendable in the moving direction of the carriage and movable in the vertical direction is provided in front and below the carriage. In the sleeve brick exchange device according to claim 9 or 10,
A protective roof projecting toward the front of the cart is provided in front and above the cart,
The sleeve brick replacement device, wherein a front portion of the protective roof is extendable in the moving direction of the carriage. In the sleeve brick exchange device according to claim 11,
An apparatus for exchanging sleeve bricks, characterized in that a lifting device capable of traversing in a direction orthogonal to the moving direction of the carriage is provided in front of and below the protective roof. In the sleeve brick replacement apparatus according to any one of claims 9 to 12,
An apparatus for exchanging sleeve bricks, comprising: a centering device that irradiates a light beam for centering parallel to each axis on a surface including the axis of each of the tool boom and the sleeve boom. Using the sleeve brick replacement apparatus according to claim 13, a sleeve brick replacement method in which a tubular sleeve brick forming the steel outlet hole in a molten metal container having a steel outlet hole is exchanged hot. There,
Adjusting the posture of the tool boom by irradiating with a light beam so as to coincide with the axis of the sleeve brick,
In the initial stage, the sleeve brick is drilled by striking and rotating the drilling tool, the frequency of striking the drilling tool is reduced from the final stage to the time of penetration, and the drilling tool is repeatedly moved forward and backward by the rotating body. Piercing the sleeve brick;
A method of replacing a sleeve brick, comprising the step of traversing the traverse base, causing the sleeve boom to face the hole after drilling, and inserting a sleeve brick for replacement. A sleeve brick replacement method in which a tubular sleeve brick forming the tuyere in a molten metal container having tuyere is exchanged hot using the sleeve brick exchanging device according to claim 13. ,
Extending the front portion of the work deck and the protective roof to a position close to the outer surface of the converter, and ensuring a work environment;
Removing the member provided at the bottom of the molten metal container and carrying it out by the hoist;
Adjusting the posture of the tool boom by irradiating with a light beam so as to coincide with the axis of the sleeve brick,
Drilling residues in the sleeve brick and the molten metal container by striking and rotating a drilling tool;
A method of replacing a sleeve brick, comprising the step of traversing the traverse base, causing the sleeve boom to face the hole after drilling, and inserting a sleeve brick for replacement.

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