JPH0361313A - Repairing device for rh furnace - Google Patents

Abstract

PURPOSE:To efficiently execute repair of an RH furnace and repairing exchange of submerged tubes by constituting a repairing apparatus for RH furnace of a slag cutter, TV camera for observing inner part, refractory injecting device and press-in device and drying device for repairing the submerged tubes, etc. CONSTITUTION:A repairing truck 19 is laid as possible to run on the same rails 22 as that for a ladle truck 20 and the slag stuck to lower faces and side faces of both submerged tubes 28, 29 in the RH furnace is removed with the lower face slag cutter 11 and outer circumference slag cutter 12 fitted to the repairing truck 19. Successively, eroded condition at inner part of the RH furnace 30 is observed with the TV camera instrument 13 and the refractory is blown to repair the eroded part in the furnace with the refractory injecting devices 14, 15 and also the press-in device 18 is inserted into the submerged tubes 28, 29, and after pouring monolithic refractory between the submerged tube and press-in device, the refractory repairing material is dried and burnt with the preheating and drying device 17. The repairing of RH type vacuum degassing furnace, which is difficult to use by erosion and sticking of slag, is efficiently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to repair equipment for an RH furnace used for vacuum degassing treatment.

(Prior art) The main parts of an RH furnace are composed of various subdivisions such as an upper tank, an intermediate tank, and a lower tank, and an immersion pipe.As is well-known, the RH furnace is a suction pipe and a discharge pipe for molten metal. Since it is immersed in molten metal, slag and the like adhere to it and it is damaged by erosion, requiring early repair and replacement.

When repairing immersion pipes between operations, a slag cutter device to remove slag adhering to the immersion pipes,
Work such as spraying fireproofing material to repair damaged areas and conducting observations to understand the extent of the damage was done by hand.

Therefore, as repair equipment for such RH furnaces, jigs and slag removal devices (for example,
Slag removal device described in Japanese Utility Model Publication No. 52-50322)
, or repair machines have been proposed.

In addition to the above work, there is work to replace the immersion tube, but this replacement cannot be done manually, and equipment equipped with a holding mechanism and lifting device for attaching and detaching the immersion tube is separate from the vacuum degassing treatment area. It was located at the location of

[Problem that the invention seeks to solve]

However, in order to repair the above-mentioned immersion pipes, in addition to a device to remove the attached slag, a device to check the state of erosion and repair and a drying device are required, and a separate device to replace the immersion pipes is required. Since it was installed at the location, there was no need to repair or replace the immersion pipes, etc. J! There are problems in that the process is complicated, has poor workability, and is time-consuming.

The present invention was made in view of these circumstances, and
The purpose of the present invention is to provide repair equipment for an RH furnace that can efficiently repair the furnace and replace the immersion tube.

[Means for solving problems]

The RH furnace repair equipment according to the present invention that meets the above purpose is
A slag cutter device that removes slag adhering to the immersion tube of the furnace, a television camera device that monitors the melting condition inside the RH furnace, a device that repairs the inside and outside of the immersion tube, and a device that repairs the immersion tube. A press-fitting device for repairing the inside of the pipe, a preheating drying device using a burner for drying the repaired immersion tube and preheating the entire RH furnace, an opening/closing sliding deck for punching work, and a lifting means carrying these devices. A repair truck that runs on a track of a ladle truck having a ! 3! It is constructed by having a work deck/receiving stand device placed thereon.

[Effect]

The RH furnace repair equipment according to the present invention uses a slag cutter device mounted on a repair truck to remove slag adhering to the lower surface and surroundings of the immersion tube.

Then, the inside of the RH furnace is monitored by a television camera device. In this case, by storing the television camera in a water-cooled container, it is possible to see the internal melting state due to hot conditions.

Then, we repair the immersion pipe, etc., but in this case,
After confirming the internal and external melting damage, if the spraying is to be carried out for repair, the spraying placed on the repair trolley should be carried out using a device, and if the internal melting damage is severe and the repair is to be carried out by press-fitting. This is done using a press-fitting device mounted on the repair truck.

In addition, when performing local repairs on the outside, the retractable sliding deck for patching work is opened, and the patching work is performed by descending to the lower work deck and manually pressing the repair material.

Next, when drying materials that have adhered due to repair work, a preheating drying device using a burner is used, which not only dries the repair material but also preheats the RH furnace before using it. It can be done by

When replacing the above-mentioned immersion pipe and the lower tank and intermediate tank connected to it, use the ladle truck used for normal work, and install the work deck and cradle device on top of this ladle truck. Load it and work.

In this case, by using the lifting device of the ladle truck,
It is possible to smoothly replace the immersion pipe, the lower tank, and the intermediate tank, and it is also possible to construct a RH furnace by placing a lifter or the like thereon.

〔Example〕

Next, embodiments embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a schematic configuration diagram of the RH furnace repair equipment according to the present invention, FIG. 2 is a plan layout thereof, FIG. 3 is an overall plan view of a repair cart of the RH furnace repair equipment, and FIG. Figure 5 is a front view of the bottom slag cutter, Figure 6 is a side view of the outer slag cutter, Figure 7 is a side view of the TV camera equipment and spraying equipment, and Figure 8 is the spraying equipment. 9 is a front sectional view of the drying device, FIG. 10 is a sectional view of the same side, FIG. 11 is a plan view of the same, and FIG. 12 is a patching device placed on the top of the press-fitting device in the stored state. A side view of the retractable slide deck for work, Figure 13 is a side view of the press-fitting device, and Figure 14 is a ladle truck! ! The work deck/receiver shown in Figure 3 is a plan view of the gantry device, Figure 15 is a side view of the same, and Figures 16 and 17 are partial side views of the work deck/receiver when the gantry device is in use. be.

As shown in FIGS. 1 to 4, R according to an embodiment of the present invention
The repair equipment for the H furnace consists of a lower slag cutter 11 and an outer slag cutter 12 that constitute a slag cutter device, and an R furnace.
a television camera device 13 for viewing the melting state inside the H furnace;
The spraying device mounted on the same truck as the TV camera device 13 includes an external spraying device 14, an internal spraying device 15, and a material supply device t16 for supplying spraying materials to these devices. , a preheating drying device 17 that dries the repaired immersion tube and preheats the entire RH furnace, a press-in device 18 that press-fits a repair refractory into the immersion tube, and an openable slide deck 74 for patching work. 79, a repair trolley 19 on which these devices are mounted, and a work deck/reception platform device 21 mounted on a ladle trolley 20 which is used for normal work and has a lifting means. There is. These will be explained in detail below.

As shown in FIGS. 2, 3, and 4, the repair truck 19 is mounted on the same rail 22 as the ladle truck 20 used for normal work, and is equipped with a power source on the side. A cable winder 23 for supplying cables, etc., and a hose winder a24 for winding air hoses and water hoses are provided.

As shown in FIGS. 3, 4, and 5, the lower slag cutter 11 attached to the repair cart 19 has blades 11a lined up at the upper end and a frame 25 with guides arranged at the front and rear. Electric cylinders 2 on both sides that raise and lower the frame 25
6.27, and the blades 11a arranged in parallel at the upper end of the frame 25 are connected to the RHHSO3 immersion tube 28.29.
Slag adhering to the lower end of the dip tube 28, 29 is removed by reciprocating the repair cart 19 back and forth so as to coincide with the vicinity of the lower end of the dip tube 28.29.

The outer peripheral slag cutter 12 attached to the repair cart 19 and attached to the RHHSO 3 axis is shown in Figs. 3 and 6.
As shown in the figure, an expansion/contraction drive means 31a for laterally expanding and contracting opposing blades 31.32 arranged in parallel at the radius of curvature between the outer diameter of the immersion tube 28.29 and the path, and a nuclear force 31.32 It has an elevating means 32b that ascends and descends together with the expansion/contraction drive means 31a, and a rotary drive device 32e that rotates the whole of these at a low speed. After stopping and first raising the entire body to a predetermined height, the blade 31.
Determine the spacing of 32 and the nuclear force 31.32 to the dip tube 28.2
By rotating and moving up and down while in contact with 9, the slag 33 adhering to the periphery of the dipping tubes 28 and 29 is removed.

As shown in FIG. 1, a cart 34 that moves in a direction perpendicular to the traveling direction of the rail 22 is provided on the left side of this outer periphery slag cutter 12, and as shown in FIG. The above-mentioned television camera device 13 and external spray device 14 are attached to the trolley 34.

The lower end of the support member 37 of the TV camera device 13 is attached to a guide column 36 attached to a trolley 34 so as to be able to move up and down, and is rotated up and down by an electric lifting device 38 having an internal motor. The inside of the RH furnace 30 can be observed through the provided television camera device 13. The television camera device 13 is housed in a water-cooled container and has a structure that allows it to image the outside through heat-resistant glass, and the signal is transmitted by radio waves to a television device placed outside the repair cart 19 to view the image. It is now possible to do so.

Further, the outer surface spraying device 14 attached to the trolley 34 has a spraying nozzle 40 attached to the tip of an L-shaped jig 39, and a support supporting the jig 39, as shown in FIG. The spraying device includes a rotation drive device 42 that rotates the nozzle 40, and an electric lifting device 44 that moves the nozzle 40 up and down along the guide column 43. It has a structure that allows it to rotate freely around the

The television camera device 13 and the external spraying device 14 are attached to a trolley 34, and by running the trolley 34, one of the devices can be used by aligning it with the axis of the dip tube 28, 29. It has become.

Then, in the center of the repair cart 19, the inner surface spraying device 1
The device 15 is attached to the tip of a vibrator 45, and the repair material sprayed from the tip of the vibrator 45 is attached to the tip of the vibrator 45 and sprays the repair material into the immersion tube 2 and 29. It can be sprayed on the affected areas.

As shown in FIG. 8, the material supply device 16 attached to the exterior spraying device 14 and the inside spraying device 15, which constitute the above-mentioned spraying device, is provided with a butterfly valve 46 at the top and stores the repair material inside. It has a well-known structure with a tank 47 equipped with a material cutting device at the bottom, and the repair material is conveyed by compressed air, water is mixed in the middle, and the spray at the upper end is supplied to a nozzle 40.48. Here, in the figure, the following air is blowing air for material conveyance,
Secondary air is auxiliary air and is used to improve the spraying conditions.

Next, a hood-type preheating drying device 17 is arranged to dry the sprayed repair material and preheating the RH furnace. As shown in the figure, there is provided a drying hood 49 lined with refractory material into which the dip tubes 28, 29 are completely fitted.
An external heating burner 50 is arranged in the middle of the immersion tube 28, 29, and a central part of the immersion tube 28, 29 is provided with the
Internal heating burners 51, 52 are arranged as shown in FIG.

The external heating burner 50 is a conventional oil burner, and blows combustion gas into the center of the immersion tube 28, 29 to heat the outside of the immersion tube 28, 29 by a swirling flow.

On the other hand, as shown in FIG. 10, the internal heating burner 51 (52 is the same) is attached to an elevating cart 54 that supports a support member 53, and the elevating cart 54 is connected to upper and lower sprockets 55.
．． A chain 56 is attached with tension, and the elevating cart 54 is moved up and down by a deceleration motor 57 that rotationally drives an upper sprocket 55. The sprocket 55, 56 and the reduction motor 57 are the 11th
As shown in the figure, it is attached to an internal pedestal 58,
The pedestal 58 is mounted on an outer fixed pedestal 63 via guides 59 to 62 so that it can be raised and lowered, and the pedestal 58 is driven up and down by an electric cylinder 64 provided at the center.

The drying hood 49 is attached to the upper part of the pedestal 58 and can be raised and lowered until the upper end of the drying hood 49 comes into contact with the flange 65.65a of the dip tube 28.29. In this case, an air pipe 6 that supplies combustion air is connected to a blower (not shown).
6 is provided with a telescopic tube 67, and by extending the telescopic tube 67, air can be supplied to the internal heating burners 51, 52, respectively.

In addition, by attaching the immersion tubes 28 and 29 to the drying hood 49, the immersion tubes 28 and 29, which are immersed in the molten metal and heated, can be heated.
．． It can also be used as a hood to shield the heat emitted from the dip tubes 28 and 29, making it safer to work near the dip tubes 28 and 29. Note that the internal heating burners 51, 52 are not shown in FIG.

A press-fit device 18 is provided at the end of the repair cart 19, and as shown in FIG. An elevating frame 69, an electric cylinder 70 serving as a driving source for raising and lowering the elevating frame 69, and a material supply pipe 7 disposed inside the cylindrical body 68 and whose discharge port coincides with the outer surface of the cylindrical body 68.
1.72, and after arranging the cylindrical body 68 with its axis aligned with the lower part of either one of the immersion pipes 28 and 29 to be repaired, the electric cylinder 70 is operated to raise and lower the elevating frame. 69 and lower the flange 7 of the cylinder 68.
3 is brought into contact with the lower end of the immersion pipe 28.29, then the repair material is poured into the material supply pipe 71.72 using a hose (not shown), discharged from the tip to the outside of the cylinder 68, and filled into the melted area. Perform repairs.

When an appropriate amount of repair material is supplied, it overflows from the second part of the cylinder 68, so this is confirmed, the supply of repair material is stopped, and the connected hose etc. are removed to allow the material to harden. Then, the cylindrical body 68 is removed from the lifting frame 69 and used as a formwork, and the material is waited for to harden. Here, the cylinder 68 is manufactured using an iron plate, and is used with the repaired RHHBO2 cylinder 68 attached, and is removed by being melted by the molten metal flowing through the immersion pipe.

When this press-fitting device 18 is not used, the upper part is used as a workbench. In this case, as shown in FIG. By hooking the hook attached to the tip of the wire wound on the winding winch 80.81 to the front end or rear end of each slide deck, and operating the nuclear winding winch 80.81, the slide deck 7
4 to 79 are opened and closed. In particular, with this slide deck 74.75 open and the slide deck 78.79 located at a lower position closed,
An operator can ride on the putty 79 and perform putty application work.

Next, to explain the work deck mount device 21 attached to the ladle truck 2° shown in FIG. 14 and FIG. Although it is removably attached, the work deck has a hole 85 in the center of the frame W21, into which the dip pipe 28, 29 attached to the lower tank 83 is fitted together with its attachment U flanges 65a, 65. It is provided. Therefore, when replacing the intermediate tank 86 or the lower tank 83, as shown in FIG.
To install, loosen the bolts on the flange with the bottom of the seat in contact with the seating surface 87. As a result, the lower tank 83 or the intermediate tank 86 will be placed on the work deck 21 with the immersion pipes 28 and 29 attached, but the immersion pipes 28 and 29 will be installed in the hole 85. Because it is embedded in
It can be transported in a stable state.

Further, when replacing the lower tank 83 or intermediate tank 86, the lower tank 83 or intermediate tank 86 to be replaced is assembled and attached to the upper tank 88 through the steps reversed to the above steps. Through the above steps, the lower tank 83 and the intermediate tank 86 can be replaced.

Next, this work deck can be moved using the stand device 21.
) (When repairing the inside of the furnace 30, as shown in FIG.
After 0 is placed, workers enter inside and remove the refractories. The dust generated by this is sucked by a dust collector (not shown) attached to the dust collection hood 89.
Falling refractories are collected in a waste container 90 at the bottom.

This allows internal refractories to be dismantled without worsening the surrounding work environment.

Next, when constructing the inside of this RH furnace 30, the above-mentioned work decker placed a multi-stage piston type glue lid on the pedestal device 21, and aligned the axis of the lifter with the axis of the RHHBO2. Construction of the internal furnace will be carried out in this condition.

Since the RH furnace repair equipment according to an embodiment of the present invention is configured as described above, it is possible to repair and replace damage to the immersion tubes 28 and 29 that occur when performing degassing treatment using the RH furnace. , and replacement and repair of the lower tank 83 and intermediate tank 86,
Furthermore, the construction of the RH furnace 30 itself can be performed efficiently.

〔Effect of the invention〕

As is clear from the above explanation, the RH furnace repair equipment according to the present invention has a slag canter device, a television camera device, a spraying device, a press-fitting device, and a preheating drying device on the repair cart, so that it can be damaged by wear and tear. While observing the situation, necessary repairs and replacements of the immersion tube, lower tank, and intermediate tank of the RH furnace can be efficiently carried out, and the construction of the hH furnace can be carried out efficiently.

In addition, preheating and drying can be performed before using the RH furnace, thereby mitigating thermal shock, and furthermore, by using the work deck and stand device, the immersion tube can be replaced smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of RH furnace repair equipment according to the present invention,
Fig. 2 is a plan view of the same, Fig. 3 is an overall plan view of the repair cart of the repair equipment for the RH furnace, Fig. 4 is a side view of the same, Fig. 5 is a front view of the lower slag cutter, and Fig. 6 is a 7 is a side view of the TV camera device and the spraying device; FIG. 8 is a schematic configuration diagram of the spraying device; FIG. 9 is a front sectional view of the drying device; FIG. 10 is the same. 11 is a plan view of the same, FIG. 12 is a side view of the retractable sliding deck for patching work placed on the top of the press-fitting device in the stored state, and FIG. 13 is a side view of the press-fitting device; Figure 14 is a plan view of the work deck/receiver placed on the ladle truck, and Figure 15 is a side view of the same, and Figures 16 and 17 are the work deck/receiver mounted on the ladle truck using the stand device. FIG. [Explanation of symbols] 11-1---・・・・−Lower surface slag cutter, 11
a--Blade, 12-------Outer slag cutter, 13--Television camera device, 1
4・・・・−・・External surface spraying is done by equipment, 15・・・・・・・・・・・
・・Inner surface spraying equipment, 16・・・・−・Material supply device,
17.----- Preheating drying device, 111--.
・Press-fitting device, 19・・・・・・Repair trolley, 20・・・・
- Ladle truck, 21.--.--.Working deck and receiver is a mount device, 22.--1..-Rail, 23.--.--.-
・Cable winder, 24---Hose winder, 25--1--Frame, 26.27--
Electric cylinder, 2nd, 29.--------Immersion tube, 30---1--.RH furnace, 31.32-----
--Blade, 31a --- Expansion/contraction drive means, 3
2tl-----1 lifting means, 32C--111--rotation drive device, 33...--slug, 34
・−・−Dolly, 35−・・−・−Electric cylinder 36・
...--Guide pillar, 37---Support member,
38...-----Electric lifting device, 39-1~--
-----Jig, 40・-・---・-Nozzle for spraying, 40-
−−−−−−−One jig, 41・・−・−・−Support member,
42-- Rotation drive device, 43-- Guide column, 44-- Electric lifting device, 45-
・−・・−・−Pipe, 46−・−・−・−Butterfly valve, 47−・・・・・Tank, 48−・・−−−
-m- Spraying nozzle, 49...--Drying hood, 5
0--------1 external heating burner, 51.52
−・−・−・・−・−Internal heating burner, 53−−−−
---・-Support member, 54・--・-- Lifting trolley,
55.56-- Sprocket, 57--1-
−・Deceleration motor, 58・−・−・−・− Frame, 59~
62-・-・-・-guide, 63・-m---・・-・
Fixed frame, 64--... ~ Electric cylinder, 66-
・・−・・−Air pipe, 67・−−m−−・−
Expandable pipe, 68--Cylinder, 69--Elevating frame, 70--Electric cylinder, 71.72--
・・・・・−・Material supply pipe, 73・・・・・・−・−flange, 74 to 79−−−−−・Slide deck,
80.81---------・Hand-wound winch, mounting・
...-- Frame, 83--- Lower tank, 85--...
-・-Installation hole, 86...---1 intermediate tank, 8
7-・-・-・Seating surface, 88・・・・・・・Upper tank, 89・−・−・・Dust collection hood, 90−・・・・・−
・Waste container

Claims (1)

[Claims] (1) A slag cutter device that removes slag adhering to the immersion tube of the RH furnace, a television camera device that monitors the corrosion damage inside the RH furnace, and an internal and external spraying device that performs spray repair of the immersion tube. , a press-fitting device for repairing the inside of the above-mentioned immersion tube, a preheating drying device using a burner for drying the repaired immersion tube and preheating the entire RH furnace, an openable slide deck for patching work, and these devices. a repair truck that runs on a track of a ladle truck with a lifting device;
RH furnace repair equipment comprising a work deck/receiving cradle device placed on the ladle truck.