JPH09192824A - Method and device for maintenance of tundish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute maintenance work for a large or small tundish with one maintenance device by clamping the tundish with a moving clamper, turning over the tundish, inserting a base metal peeling rod into a nozzle hole and peeling a metal stuck on the inner face of the tundish. SOLUTION: The tundish 11 after used is carried in on a tundish support base 18 of the tundish maintenance device 10 by a ceiling crane. By traveling a clamper 21, the tundish 11 is fixed to the support base 18. The tundish 11 is turned upside down by a reversing motor 32 and then dross in the tundish 11 is discharged. By running a moving truck 41, a metal peeling rod 42a is arranged right above the nozzle hole of the tundish 11. By protruding the metal peeling rod 42a with a hydraulic cylinder 42 downward, the metal stuck on the inner face of the tundish 11 is peeled and dropped downward. By traveling the clamper 21 and metal peeling rod 42a, positioning is made possible regardless of a size of the tundish 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish maintenance device and a maintenance method therefor, and more particularly, it is used in continuous casting for continuously casting molten steel to cast slabs, blooms and billets. The present invention relates to a tundish maintenance device and a maintenance method for maintaining a tundish.

[0002]

2. Description of the Related Art For example, in a process of casting a slab such as a slab, a bloom or a billet by a continuous casting method, for the purpose of removing non-metallic inclusions in molten steel and stabilizing a molten metal level in a mold. A tundish that receives molten steel from a ladle and supplies it to a mold is used. The tundish has a refractory lining on the inner surface of the iron skin, and it is necessary to refill or partially repair the lining refractory as time passes. On the other hand, when the tundish after use is cooled, a solidified product of residual molten steel called a metal remains inside. Therefore, it is necessary to remove this metal when relining or repairing the refractory lining of the tundish.

As a conventional device for performing these operations, for example, a "tundish repair device" disclosed in Japanese Patent Publication No. 63-54471 is known. In this conventional device, the rotating boom is rotated in the circumferential direction by the rotating means, or tilted with respect to the rotating boom by the tilting means, so that the gripping claw of the attachment attached to the tip of the rotating boom is
The tundish is pulled up by hooking on the hooking member on the bottom of the tundish, and in this pulled state, the push-out means pushes the push-out rod into the nozzle hole of the tundish to attach the tundish to the ground. It is a device that pushes away gold.

[0004]

However, in such a conventional tundish repair device, the tundish is fixed to the attachment which is the push-out means side of the metal, and in this state, the push-out is performed. Peeling the metal in the tundish by means, although a series of technical ideas related to metal peeling is disclosed, usually compared to bloom casting and slab casting, billet casting for some length There is no description of a supporting device that supports a tundish that is short and has different lengthwise dimensions depending on the type. Therefore, from a general idea, a large tundish support device for long bloom casting and slab casting and a small tundish support device for short billet casting are permanently installed in the tundish repair shop. Therefore, it is presumed that the work operator selectively used any one of the tundish support devices of large and small in accordance with the type of tundish. As a result, there is a problem in that the equipment cost is increased and a tundish repair shop with a large space must be secured. The present invention has been made in view of such circumstances, and a tundish of different types and sizes can be obtained by a single device.
An object of the present invention is to provide a tundish maintenance device and a maintenance method capable of removing ingots and slag, dismantling a damaged portion of a refractory, and maintaining a sliding nozzle.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The tundish maintenance device described is a movable clamper that clamps a tundish, a fixed base that supports the tundish and that can hold the tundish between the clamper, the clamper and the fixed base. With a reversing device capable of reversing the tundish in a gripping state by, and having a metal peeling rod insertable into the nozzle hole of the tundish, by inserting the metal peeling rod into the nozzle hole, A bare metal removing device for peeling the bare metal adhered to the inner surface of the tundish is provided.
The rotation angle of the tundish by the reversing device here is 180 ° of the literal “reversal” angle derived from the device name.
However, the tilt angle is not limited to 0 ° and 360 ° and includes any tilt angle. This also applies to claim 3.

According to a second aspect of the present invention, there is provided a tundish maintenance device according to the first aspect, wherein the tundish is lined with a refractory dismantling device while the tundish is tilted at a predetermined angle. Objects are dismantled and then a working deck attached to the fixture is used to service the sliding nozzle at the bottom of the tundish. Furthermore, in the tundish maintenance method according to claim 3, the tundish is held between the trumpet clamper and the tundish fixing base, and the tundish is turned upside down by the turning device in this holding state. , The step of discharging the scraps inside, and after discharging the scraps,
Pushing into the nozzle hole of the tundish in the upside-down state to peel off the metal adhered to the inner surface of the tundish, and in the sideways state in which the tundish is tilted by a predetermined angle by the reversing device. , Disassembling the damaged part of the refractory lining of the tundish,
After disassembling the damaged portion of the refractory lining, the tundish is turned upside down again to discharge the refractory waste in the tundish, and after the refractory waste is discharged, the tundish is again rotated at a predetermined angle. And the sliding nozzle at the bottom of the tundish is maintained in a state in which the tundish is tilted sideways. It should be noted that the state in which the tundish is laid sideways when disassembling the damaged portion of the refractory lining and when servicing the sliding nozzle is referred to here as the tundish that allows the operator to easily stand and rotate the tundish 90 ° to the left or right. The state (tilt angle + 90 ° or −90 ° (270 °)) in which the rotation is performed or the inclined state close to that is preferable.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. The reversing and tilting of the tundish by the reversing device herein means rotating the tundish by a predetermined angle with reference to a normal tundish use state with the upper surface of the bottom of the tundish facing upward. The tundish handled here is based on relatively large ones for blooms or slabs. As shown in FIGS. 1 to 3, a tundish maintenance device 10 according to an embodiment of the present invention includes a reversing device 12 capable of reversing a tundish 11, and a tundish disposed above the reversing device 12. A metal removal mechanism 14 is provided for removing the metal adhered to the inner surface of 11.

The reversing device 12 is a rectangle in plan view, which is an example of a fixed base rotatably supported by a rotary shaft 17 between bearing boxes 16 on a pair of mounts 15 arranged on both sides. It has a frame tundish support 18. Figures 4 and 5
As shown in FIG. 2, the tundish support base 18 has a basic structure in which a short side frame 18d is horizontally mounted on one end of a pair of long side frames 18c, and a large collar-shaped plate is provided on the other ends of both long side frames 18c. Two
8 is laterally bridged to form a rectangular frame. Tundish end support frames 18a are horizontally provided near both ends of the tundish support base 18 in the longitudinal direction, and the positioning protrusions 18b of the tundish 11 are provided on the upper surface of each tundish end support frame 18a. Is provided.

A positioning frame 19 for the tundish 11 'is provided below the central portion of the tundish support base 18 in the lengthwise direction so as to extend laterally between the elongated side frames 18c. Near both sides of the center of the positioning frame 19,
A projecting strip 11a (FIG. 7) provided on the entire bottom surface of the center of the short tundish 11 'for billet casting in the longitudinal direction.
Each pair of taper portions 19a for positioning the tundish 11 'by being fitted to the tundish 11' are projected. When the long tundish 11 for bloom casting and slab casting is placed on the tundish support table 18,
The tundish support base 18 is positioned between the positioning projections 18b on the tundish end support frame 18a in a state where the tundish support base 18 is supported downward by a pair of receiving frames 20 located below both sides of the central portion in the longitudinal direction. . On the other hand, the short tundish 11 'is also a pair of receiving frames 20.
The protrusions 11a on the bottom surface of the tundish 11 'are positioned by being fitted between the pair of tapered portions 19a protruding from the positioning frame 19 while being supported downward by. It should be noted that, for example, a long tundish 11 for bloom casting and slab casting can be positioned by a positioning structure using the protrusions 11a and the tapered portion 19a, or a short tundish 11 'for billet casting.
May be designed to be positioned between the positioning protrusions 18b on the tundish end support frame 18a.

On both sides of the tundish support base 18 in the length direction, a pair of clampers 21 movable in the length direction.
Are arranged. The clamper 21 holds the tundish 11 placed on the tundish support base 18 to hold the tundish 11 when the tundish 11 is rotated by the reversing device 12.

As shown in FIGS. 1 and 3, both clampers 21
Is a gate-shaped thick frame member, and both clampers 21 are two pairs of guide rods arranged above both ends of the long side frame 18c and aligned in the axial direction in the length direction of the tundish 11. Between the two, 22 are slidably mounted horizontally via bushes 23, respectively. As shown in FIGS. 1 and 2, the two guide rods 22 on the side of the collar plate 28 are located near the end of the collar plate 28 and the mounting portion of the receiving frame 20 on the side of the collar plate 28 of the long side frame 18c. It is laid horizontally between the support member 22a fixed on the top. On the other hand, both guide rods 22 on the side opposite to the collar plate 28 side are provided with an end portion of a long supporting member 22b fixed over the entire length of the upper surface of the short side frame 18d.
A support member 22a fixed on the vicinity of the mounting portion of the receiving frame 20 on the side opposite to the flange-shaped plate 28 side of the long side frame 18c.
It is crossed between and. In addition, one long side frame 18c
Below, a plurality of work decks 24 are attached at predetermined intervals (see also FIG. 4). The working deck 24 tilts the tundish 11 to the side or near it,
This is a deck for a worker in a standing posture to perform work such as removal, repair, and attachment of a sliding nozzle (not shown) at the bottom of the tundish 11 while looking at the sliding nozzle in the front.

A drive motor 26 is attached to the lower surface of the central portion of each tundish end support frame 18a via an attachment frame 25, and one end side is connected to the output shaft of the chain type power transmission structure. The sprocket 29 axially attached to each side surface of the support member 22 b and the collar plate 28 is rotated via 27. A sprocket 30 corresponding to the sprocket 29 is axially attached to the outer surface of each support member 22a, and both ends of the clamper 21 are fixed to a chain 31 spanned between the sprocket 29 and 30. Therefore, by rotating the output shaft of the drive motor 26, the chain 31 orbits via the chain-type power transmission structure 27, whereby the clamper 21 is rotated.
Slides along the guide rod 22 in the longitudinal direction of the tundish 11. Next, the reversing device 12 for the tundish support base 18 will be described with reference to FIGS.

As shown in FIGS. 2, 4 and 6, the reversing device 12 is shown.
Has a reversing motor 32 mounted on the frame 15 on the side of the collar plate 28, and a sprocket 33 rotates via a gear box 32a connected to the output shaft of the reversing motor 32.
The sprocket 33 is meshed with a large pin gear 34 fixed to the outer end surface of the collar plate 28. Reversing motor 32
When the sprocket 33 is rotated by
The tundish support base 18 rotates about the rotation shaft 17 via the. It should be noted that the winding motor 35a is provided on the end surface of the tundish support 18 on the side opposite to the collar plate 28 side.
And the rotation of the tundish support base 18 by the reversing device 12, the reversing motor 32 and the drive motor 26.
There is provided a power supply cable winder 35 for leading out and winding up the power supply cable connected to.
Next, with reference to FIGS. 1 to 3, the bare metal removing mechanism 14 will be described in detail.

As shown in FIGS. 1 to 3, the metal removing mechanism 14
Has a gate type pedestal 36 whose four sides are covered by protective walls with long legs arranged so as to straddle the reversing device 12, and has a work floor 37 which constitutes a part of a horizontal upper portion of the gate type pedestal 36. A pair of rails 39 extending in the length direction of the tundish 11 are provided on the parallel side frames 38. A moving carriage 41 having wheels 41a, to which one end of a pantograph-type dust collecting hood 40 is connected, is laterally provided between the rails 39. Above the central portion of the moving carriage 41, a movable truck central portion is provided. Through the formed opening, the tundish support 18
A large hydraulic cylinder 42, which is an example of a bare metal removing device having a bare metal peeling rod 42a that is pulled in and out, is vertically installed. Using the traveling motor 41b,
The tundish 11 is placed on the nozzle hole 11b of the tundish 11 which is inverted by 180 ° by the reversing device 12, then the metal peeling rod 42a is projected by the hydraulic cylinder 42, and the tip end thereof is inserted into the nozzle hole 11b. The metal 13 adhered to the inner surface of 11 is peeled off.

A pair of rails 43 are provided on the floor of the gate-shaped frame 36 on which the waste box 4 is mounted.
4 is mounted and has a scrap carrier 4 having four wheels 45a.
5 is provided so as to be movable in the width direction of the tundish 11. By reversing the tundish 11 by the reversing device 12, the metal 13 separated from the tundish 11 and the scraps of the disassembled lining refractory 11c are put into the scrap receiving box 44.

Next, the tundish maintenance device 1 of the present invention
A tundish maintenance method using 0 will be described. First,
A case of preparing a relatively long tundish 11 for obtaining a bloom or a slab by continuous casting will be described. As shown in FIGS. 1 to 3, the tundish 11 is loaded into the tundish 11 by an overhead crane (not shown) while the tundish support base 18 is tilted by the reversing device 12 at 0 °. By guiding the both ends of the tundish 11 between the positioning protrusions 18b on the positioning frame 19, the receiving frame 20, and the tundish end supporting frame 18a of the support base 18, the length and width of the tundish 11 can be increased. Place with the orientation set.

Then, the drive motor 26 causes the clamper 21 to pass through the chain type power transmission structure 27, the sprockets 29 and 30, and the chain 31 along the guide rod 22 above the tundish 11 in the longitudinal direction thereof. After moving and stopping at a predetermined clamp position, it is locked by a mechanical lock mechanism (not shown). By these, the tundish 11 is firmly fixed to the tundish support base 18. Then, the sprocket 33 and the pin gear 34 are rotated by the reversing motor 32, and the tundish support base 18 is rotated 180 ° to the left or right to reverse the top and bottom, and the waste in the tundish 11 is received in the waste receiving box 44. Discharge inside. Then, the movable carriage 41 is allowed to travel in this state, the metal peeling rod 42a of the hydraulic cylinder 42 is arranged directly above the nozzle hole 11b, and then the metal peeling rod 42a is projected downward to have its tip end portion. Is inserted into the nozzle hole 11b, the base metal 13 attached to the inner surface of the tundish 11 is peeled off, and the base metal 13 is dropped into a waste container box 44 arranged below in advance.

Then, the tundish support base 18 is rotated by the reversing device 12 to the left or right by about 90 °,
The tundish 11 is tilted to a sideways state (tilt angle + 90 ° or −90 ° (270 °)) in which the inner surface of the bottom portion is directed to the side or a state close thereto. Then, using a known refractory dismantling device, for example, a tundish refractory dismantling device as disclosed in Japanese Patent Publication No. 63-54471, the damaged portion of the lining refractory 11c is scooped and / or
Or remove by excision. After that, the tundish support base 18 is rotated by the reversing device 12, and the inner surface of the bottom of the tundish 11 is directed downward again (tilt angle 180
°), the refractory scraps of the disassembled lining refractory 11c are dropped into the scrap receiving box 44. After that, the waste receiving cart 45 equipped with the waste receiving box 44 travels on the rail 43 and is carried out to the outside.

Subsequently, the tundish support base 18 is again rotated to the left or right by about 90 ° by the reversing device 12 so as to fall sideways (tilt angle + 90 ° or -90 ° (27).
(0 °)) or its vicinity, and then, with a sliding nozzle (not shown) provided at the bottom of the tundish 11 in a standing posture in which the operator rides on the working deck 24, with the sliding nozzle in front of the operator. Maintenance of the sliding nozzle is carried out by removing, repairing, and installing. Conventionally, when servicing a sliding nozzle, it was common to place the tundish on a dedicated stand and put a worker underneath the tundish in a supine position, which caused poor workability and easy fatigue. As described above, the present means allows the worker to easily work in a standing posture, is not exposed to the refractory powder, and is excellent in safety and work efficiency. However, in the case of a tundish with a stopper, the maintenance work of the sliding nozzle is unnecessary. After completing all the above maintenance, the tundish 11 is rotated leftward or rightward by the reversing device 12 to release the restraint by the clamper 21, and then, for example, by an overhead crane.
It is transported to a refractory construction site and the lining is repaired with a standard refractory or an irregular refractory.

Next, the case where the tundish 11 'for continuous billet casting is prepared will be described. The tundish 11 'used during continuous billet casting is smaller than the tundish 11 for bloom or slab. In this case, as shown in FIGS. 5 and 7, the loaded tundish 11 ′ is loaded into the tundish support base 18
The protrusions 11a of the tundish 11 'are attached to the positioning frame 19 and the receiving frame 20 of the positioning frame 1
The taper portion 19a of 9 is mounted while being guided to fit. It should be noted that the brackets 10 for fixing the side portions of the tundish 11 'are provided near both ends of each long side frame 18c.
0 is installed and the tundish hanging metal fitting 100a
Is guided along the bracket 100 to position the tundish 11 'in the width direction. Others are the same operations and works as when preparing the tundish 11 for bloom or slab.

As described above, since the tundish maintenance device 10 of this embodiment has the clamper 21 which can be displaced and fixed in the lengthwise direction of the tundish 11, the tundish for continuous bloom or slab casting. 11 and tundish 11 'for billet continuous casting,
Even one tundish of different type and size can be serviced with the same tundish service device 10. In addition, the tundish 11, 11 ′ is, for example, turned upside down and laid down (tilt angle + 90 °) by using the reversing device 12.
Alternatively, by tilting and holding to -90 ° (270 °) or an angle close thereto, peeling of the metal 13 using the metal removing mechanism 14 and lining fire resistance using a tundish refractory dismantling device The dismantling of the object 11c and the maintenance of the sliding nozzle can be smoothly performed.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the scope of the present invention, it is included in the present invention. Be done. For example, in the embodiment, the moving direction of the clamper is the length direction of the tundish, but the present invention is not limited to this and may be a composite direction including the width direction of the tundish. Also, the tundish's fixed base,
The reversing device and the bullion removing device are not limited to the embodiments, as long as they have respective functions,
It may have any shape and structure. Furthermore, in the embodiment, the refractory dismantling device is used for disassembling the refractory lining refractory in the tundish, but the present invention is not limited to this and may be performed manually by an operator.

[0023]

According to the tundish maintenance device of the first and second aspects and the tundish maintenance method of the third aspect, a tundish for a large bloom, a slab casting or a small billet casting is used as described above. , Tundish of different type and size with one tundish maintenance device, various kinds of maintenance such as metal removal, dismantling work such as scuffing and / or cutting removal of damaged part of lining refractory, and maintenance of sliding nozzle You can work. Further, the damaged portion of the refractory lining can be dismantled by, for example, a refractory dismantling heavy machine in a state where the tundish is laid sideways or tilted at an arbitrary angle, so that work efficiency can be improved. Further, in the tundish maintenance device according to the second aspect and the tundish maintenance method according to the third aspect, when performing the maintenance of the sliding nozzle, the bottom surface of the tundish can be laid down sideways or inclined at a predetermined angle. Therefore, it is possible to safely and hygienically perform various work associated with repairing the refractory powder without being exposed to the refractory powder and to improve workability.

[Brief description of the drawings]

FIG. 1 is a front view of a tundish maintenance device according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a vertical sectional view of the main part.

FIG. 4 is a front view of a tundish support and a reversing device.

FIG. 5 is a plan view of a tundish support and an inversion device.

FIG. 6 is a side view of the tundish support and the reversing device.

FIG. 7 is an enlarged front view of essential parts showing a state in which the tundish is placed on the tundish support base.

[Explanation of symbols]

10 Tundish maintenance device 11 Tundish 11 'Tundish 11a Projection strip 11b Nozzle hole 11c Refractory lining 12 Reversing device 13 Bullion 14 Bullet removal mechanism 15 Stand 16 Bearing box 17 Rotating shaft 18 Tundish support 18a Tundish end Part support frame 18b Positioning protrusion 18c Long side frame 18d Short side frame 19 Positioning frame 19a Tapered portion 20 Receiving frame 21 Clamper 22 Guide rod 22a Supporting member 22b Supporting member 23 Bushing 24 Working deck 25 Mounting frame 26 Drive motor 27 Chain type Power transmission structure 28 Collar plate 29 Sprocket 30 Sprocket 31 Chain 32 Reverse motor 32a Gear box 33 Sprocket 34 Pin gear 35 Power cable winder 35a Winding Take-up motor 36 Gate frame 37 Working floor 38 Side frame 39 Rails 40 Dust collecting hood 41 Moving carriage 41a Wheels 41b Traveling motor 42 Hydraulic cylinder 42a Metal stripping rod 43 Rail 44 Waste receiving box 45 Waste receiving cart 45a Wheel 100 Bracket 100a Tan Dish hanging hardware

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsukasa Kusunagi 1-36 Makiyama, Tobata-ku, Kitakyushu, Fukuoka Prefecture Hamada Heavy Industries Co., Ltd.

Claims (3)

[Claims] 1. A movable clamper that clamps a tundish, a fixed base that supports the tundish and that can hold the tundish between the clamper, and a gripping state by the clamper and the fixed base. With the reversing device capable of turning the tundish upside down, and the metal peeling rod insertable into the nozzle hole of the tundish, the tundish is inserted by inserting the metal peeling rod into the nozzle hole. A tundish maintenance device comprising: a metal removing device for removing the metal adhered to the inner surface of the tundish. 2. The tundish with the refractory dismantling device dismantling the refractory lining of the tundish in a tilted state of the tundish at a predetermined angle, and then using the work deck attached to the fixed base, The tundish maintenance device according to claim 1, wherein a sliding nozzle provided at the bottom of the tundish is maintained. 3. The tundish is gripped between the tundish clamper and the tundish fixing base, and the tundish is turned upside down by the reversing device in this gripped state, and the waste inside is discharged. And a step of, after discharging the scraps, pushing the metal peeling rod of the metal extracting device into the nozzle hole of the tundish in the upside-down state to peel the metal adhered to the inner surface of the tundish. A step of disassembling the damaged portion of the lining refractory of the tundish in a sideways state in which the tundish is tilted by a predetermined angle by the reversing device, and the tundish after disassembling the damaged portion of the lining refractory. Turning the dish upside down again and discharging the refractory waste in the tundish; after discharging the refractory waste, the tundish is again placed at a predetermined angle. Only sideways state of being tilted, tundish maintenance method characterized by comprising the step of servicing the sliding nozzle at the bottom of the tundish.