JPH0743078A - Furnace wall repairing device - Google Patents

Abstract

PURPOSE:To provide a furnace wall repairing device, capable of easily effecting repairing works of not only the part of surface of vertical walls in a furnace but also the part of surface of horizontal walls in the same through remote control. CONSTITUTION:A trestle 6 is supported on a runable repair truck elevatably by a table lifter 4 while a moving truck 8 is supported on the trestle 6 movable in horizontal direction. A nozzle lance 11 is supported on the moving truck 8 so as to be pivotable between vertical position and horizontal position while a spray nozzle 13 is mounted on the nozzle lance 11 so as to be rotatable about the axial center of the nozzle lance 11 and, further, the spray nozzle 13 is mounted so as to be pivotable oscillatingly in a plane including the axial center of the nozzle lance 11. On the other hand, the driving part of a spray mechanism 5 is covered by a cooling cover 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace wall repair device used for repairing an RH furnace or the like.

[0002]

RH conventionally used for vacuum degassing treatment
The furnace is divided into an upper tank and a lower tank, and a canopy covering the upper tank, and exhaust gas holes projecting laterally are integrally formed in the upper portion of the upper tank, and It has a structure in which two immersion pipes functioning as a suction pipe and a discharge pipe for the molten metal are integrally formed in the lower portion.
In the RH furnace having such a structure, the inner wall surface of the furnace and the outer wall surface of the dip tube immersed in the molten metal are made of refractory material.

By the way, in the above-mentioned RH furnace and the like, if the refractory forming the wall surface of the furnace is damaged when it is used for a certain period of time, a repair work must be performed periodically. Conventionally, such repair work is carried out by transporting the repair material with a spray pipe and spraying it onto the wall surface of the furnace from the spray nozzle at the tip of this spray pipe. The reality is that the work is often done manually.

Therefore, as disclosed in, for example, Japanese Patent Publication No. 59-24350 and Japanese Patent Laid-Open No. 3-61313, a spray pipe is supported on a repair carriage and can be lifted and lowered with respect to the repair carriage. There has been proposed a repair device which is rotatably provided around the center of the furnace so that the repair material can be efficiently sprayed to the inner wall surface and the outer wall surface of the furnace by remote control.

[0005]

However, in the conventional repair device as disclosed in each of the above-mentioned publications, the spray tube moves only in two axial directions, that is, ascending / descending movement and rotating about the axis. Therefore, there is a problem that the inner surface of the horizontally arranged furnace wall, such as the exhaust gas hole provided in the upper tank of the RH furnace, cannot be repaired. Therefore, repairing such a part still has to rely on manual work. Moreover, since this work is carried out by a worker on a repair carriage in a high-temperature furnace, the work environment is bad and there is a danger.

Further, in the repair at high temperature, there is a problem that the radiant heat from the furnace wall seriously damages the drive mechanism, especially the electric parts such as the motor, and the malfunction may occur. The present invention has been made to solve the above problems,
It is an object of the present invention to provide a furnace wall repair device that can easily perform repair work by remote control even on a horizontal wall surface in a furnace.

[0007]

DISCLOSURE OF THE INVENTION The present invention achieves the above-mentioned object by constructing a blowing pipe so that it can be tilted to a horizontal position. That is, the furnace wall repair device according to the present invention is a furnace wall repair device that repairs the furnace wall by spraying a repair material on the furnace wall, and (a) is capable of moving up and down on a repairable carriage. A supported pedestal, (b) a spray tube rotatably supported on the gantry between an upright position and a horizontal position, and carrying the repair material, and (c) a tip portion of the spray tube. And a spray nozzle rotatable around the axis of the spray tube.

It is preferable that the spray tube is supported on a movable carriage that can move horizontally with respect to the gantry. Further, it is preferable that the spray nozzle is provided so as to be swingable and rotatable in a plane including the axis of the spray tube.

Further, each drive mechanism for rotating the spray tube, rotating and swinging the spray nozzle, and horizontally moving the movable carriage is surrounded by a cooling cover to block radiant heat from the furnace wall. However, it enables repairs at high temperatures.

[0010]

[Function] When repairing the vertical wall portion on the inner circumference of the furnace, the spray tube is rotated around the axis while the spray tube is moved up and down with the repair carriage positioned at a predetermined position, and the repair material is sprayed from the tip of the spray nozzle to the furnace. Repair is performed by spraying toward the inner wall surface of the. Also, when repairing the horizontal wall surface of the inner circumference of the furnace, rotate the spray tube so that it is parallel to the horizontal wall while avoiding interference with the furnace wall surface, and in this state, rotate the spray tube around the axis. The repair is performed by rotating and spraying the repair material from the tip of the spray nozzle toward the inner wall surface of the furnace. In this way, it becomes possible to easily perform repair work by remote control even on the horizontal wall surface of the furnace.

In this case, if the spray pipe is supported on a movable carriage that can move horizontally with respect to the gantry, the spray pipe can be moved in the direction along the horizontal wall surface when the horizontal wall surface is repaired. The repair range can be expanded.

Further, when the spray nozzle is made swingable and rotatable in a plane including the axis of the spray tube, the range of repair along the axial direction of the spray tube can be expanded by this swing. When the vertical wall surface portion and the horizontal wall surface portion are repaired at high temperature as described above, cooling water is introduced into the cooling cover. That is, the cooling water supplied from the water supply source through the water cooling hose is injected from the water injection port of the double steel plate cooling cover, circulated in the cooling cover, and then discharged from the discharge port. In order to automatically perform this cooling method, in order to detect either the ambient temperature in the furnace or the temperature in the cooling cover, a temperature sensor is used to detect the upper surface position of the cooling cover or a driving mechanism in the cooling cover, such as spraying. The temperature is set in advance in the vicinity of the nozzle overturning motor, and when a predetermined temperature is reached, an electric valve provided at the inlet is opened to inject cooling water into the cooling cover, thereby protecting the drive mechanism.

[0013]

EXAMPLES Next, specific examples of the furnace wall repair device according to the present invention will be described with reference to the drawings.

An overall system diagram of a furnace wall repairing apparatus according to an embodiment of the present invention is shown in FIG. The furnace wall repair device of this embodiment is applied for repairing the inner wall surface of the upper tank 1 of the RH furnace, and is capable of traveling along the rail 2 in the direction of arrow A, and the repair truck 3. A table lifter 4 mounted on the repair carriage 3 and movable up and down in the direction of arrow B;
A spraying mechanism 5 mounted on the table lifter 4 is provided.

As shown in FIGS. 2 and 3, the spraying mechanism 5 is provided with a pedestal 6 fixed on the table 4a of the table lifter 4, on which dolly moving motor 7 is mounted. The movable carriage 8 is supported by this drive so as to be capable of reciprocating in the direction of arrow C with respect to this gantry 6. A support bracket 9 is fixed on the movable carriage 8, and a base end portion of a nozzle lance 11 is rotatably supported on the support bracket 9 with a shaft 10 as a support shaft. The shaft 10 is rotated in the forward and reverse directions by driving the nozzle lance overturning motor 12, and the nozzle lance 11 is thereby moved between the upright position (two-dot chain line position in FIG. 2) and the horizontal position (solid line position in FIG. 2). It is designed to be rotated by.

Further, this nozzle lance 11 has a spray nozzle 13 at the tip thereof, and this spray nozzle 13
Is supported rotatably around the axis of the nozzle lance 11 by driving a nozzle lance rotating motor 14 attached to the base end of the nozzle lance 11.

Next, the rotating mechanism of the spray nozzle 13 will be described with reference to FIG. As shown in FIG. 4, the nozzle lance 11 is fitted on a cylindrical support body 15 and an inner peripheral surface of the support body 15, and is driven by a nozzle lance rotation motor 14 to drive an axial reduction gear. An outer pipe portion 17 rotated via 16 and a fixed inner pipe portion 18 fitted to an inner peripheral surface of the outer pipe portion 17 are provided. The outer pipe portion 17 is connected at its base end side to a hose connection port 21 for connecting a supply hose 20 via a swivel joint 19, and at the tip end side thereof is a pipe body 22 communicating with the spray nozzle 13.
Are linked to. A water supply hole 15a and an air supply hole 15b are formed in the support body 15, and the outer pipe portion 17 extends along the axial direction so as to communicate with the water supply hole 15a and the air supply hole 15b, respectively. An annular water passage 17a and an air passage 17b are provided. The water passage 17a and the air passage 17b are connected to the outer pipe portion 17
To the water discharge port 17c and the air discharge port 17d, which are integrally provided on the front end side of the. The water supply hole 15a and the air supply hole 15b are connected to the water supply source 25 and the air supply source 26 via supply hoses 23 and 24, respectively.
(See FIG. 1), and the water discharge port 17c and the air discharge port 17d are integrally provided at the tip of the pipe body 22 via a supply hose (not shown). Each is connected to the air supply port. Thus, the nozzle lance rotating motor 14
When the outer tube portion 17 is rotated about its axis through the on-axis speed reducer 16 by the drive of, the tube body 22 integrally provided with this outer tube portion 17 is also rotated about its axis center, As a result, the spray nozzle 13 is also rotated.

As shown in FIGS. 2 and 3, the spray nozzle 13 has a crank-shaped pipe line portion 22a provided at the tip end of the pipe body 22 in a plane including the pipe line portion 22a at the tip thereof. 2, the operation lever 28 is reciprocally moved in the axial direction of the nozzle lance 11 by the forward / reverse rotation of the nozzle tilt motor 27. It is possible to swing and rotate.

As shown in FIG. 1, the repair material is
The air source 26 is taken out from the lower part of the spray gun 29.
The compressed air (primary air) supplied from the above through the valve stand 30 is conveyed to the base end portion of the nozzle lance 11 through the supply hose 20. Further, water and air (secondary air) respectively supplied from the water supply source 25 and the air supply source 26 via the valve stand 30 are supplied to the repair material thus supplied to the nozzle lance 11, As a result, the repair material is slurried and sprayed from the spray nozzle 13 onto the wall surface to be constructed. That is, the water supplied to the water supply hole 15a through the supply hose 23 reaches the water discharge port 17c through the water passage 17a in the outer pipe portion 17, and the supply hose connected to the water discharge port 17c. Is supplied to the water supply port at the tip of the pipe body 22, and is mixed with the repair material in the pipe body 22 from this water supply port. Similarly, through the supply hose 24, the air supply hole 15b
Air supplied to the air passage 17b, the air outlet 17
It is mixed with the repair material in the pipe body 22 from the air supply port at the tip of the pipe body 22 through d. Since the water supply hole 15a and the air supply hole 15b are in a fixed state when the spray nozzle 13 is rotated by the nozzle lance rotation motor 14, the water supply hole 15a and the air supply hole 1 are
The supply hoses 23 and 24 respectively connected to 5b are not twisted. Further, since the water discharge port 17c and the air discharge port 17d rotate together with the water supply port and the air supply port that are integrally provided at the tip of the pipe body 22, the water discharge port 17c and the water supply port The supply hoses connecting the air discharge port 17d and the air supply port are not twisted. Here, the secondary air supplied to the repair material is auxiliary air and is used to improve the spraying condition.

In this embodiment, the carriage moving motor 7, the nozzle lance tipping motor 12, the nozzle lance rotating motor 14, and the nozzle, which are the driving portions of the spraying mechanism 5 mounted on the moving carriage 8, are also provided. The tilting motor 27 is surrounded by a cooling cover 31 (however, the cooling cover 31 is not shown in FIG. 3). This cooling cover 3
Reference numeral 1 denotes a double steel plate, and a water injection port 31a for supplying cooling water between the steel plates is provided in the lower portion, and a discharge port 31b for discharging the cooling water between the steel plates.
Is provided at the top. Then, cooling water is supplied to the water injection port 31a from a water supply source 25 via a water cooling hose 32, and the cooling water is circulated in the cooling cover 31 and then discharged to the outside from a discharge port 31b via a discharge hose (not shown). It has become so. Although not shown in the drawing, the cooling cover 31 is partially formed with a notch so as not to hinder the overturning operation when the nozzle lance 11 falls, and the notch is formed in the notch. A heat resistant rubber is provided so that the inside and outside of the cooling cover 31 can be always shielded even when the nozzle lance 11 performs the overturning operation. Further, the cooling cover 31 is divided into a plurality of parts in the vertical direction via a partition wall 31c, and is configured such that adjacent parts communicate with each other at one place. With such a configuration, the cooling water introduced into the cooling cover 31 through the water injection port 31a is sequentially cooled from the lower portion to the upper portion.
Fills in.

A temperature sensor 33 is provided in the vicinity of the nozzle lance tipping motor 12, and the detected value of the temperature sensor 33 is input to the control board 34, and the control board 34 detects the detected value. The electromagnetic valve (not shown) provided in the water injection port 31a is controlled so that the value becomes a set value. Here, instead of being provided in the cooling cover 31, the temperature sensor 33 may be provided in a position that directly detects the ambient temperature in the furnace such as the upper surface position of the cooling cover 31 as shown by 33 'in FIG.
The set temperature set in the control panel 34 is
When the temperature sensors 33 and 33 'are provided inside the cooling cover 31, the temperature is preferably 40 ° C to 50 ° C, and when provided outside the cooling cover 31, it is preferably 80 ° C to 100 ° C. In FIG. 1, reference numeral 35 indicates a set temperature display section.

The spraying mechanism 5 and the spray gun 29 are also provided.
The valve stand 30 is controlled by the control panel 34 based on a signal input from the operator's operation pendant 36. In FIG. 1, 37 is a spray gun control panel and 38 is a power source for the control panel 34.

Next, the operation of the furnace wall repair device constructed as described above will be described. When repairing the inner wall surface of the upper tank 1 of the RH furnace, first, the lower tank 39 (see FIG. 1)
Is removed and the repair cart 3 is run along the rail 2 and stopped at a position directly below the upper tank 1. After that, the table lifter 4 is lifted to insert the spraying mechanism 5 into the upper tank 1 from below the upper tank 1 with the nozzle lance 11 standing upright.
The spray nozzle 13 is rotated around the axis of the nozzle lance 11 by driving the nozzle lance rotation motor 14 while moving the table lifter 4 up and down, and the slurry-like repair material is supplied from the tip of the spray nozzle 13 to the upper tank 1. The vertical wall surface portion 1a is sprayed in a spiral shape to repair the vertical wall surface portion 1a. At this time, the spray nozzle 1 is swung by the forward / reverse driving of the nozzle tilt motor 27 together with the vertical movement of the table lifter 4, so that the spray nozzle 1 is rotated.
It is possible to adjust the spraying position by 3.

When repairing the inner wall surface of the exhaust gas hole 1b, which is the horizontal wall surface portion of the upper tank 1, the nozzle lance 11 is driven to 90 ° to the horizontal position (solid line position in FIG. 2) by driving the nozzle lance overturning motor 12. To tip over. When the tip of the nozzle lance 11 interferes with the inner wall of the upper tank 1 during this fall, the nozzle lance 11 is fallen while moving the table lifter 4 up and down. In this way, after positioning the nozzle lance 11 so as to be located in the substantially central portion of the exhaust gas hole 1b, the moving carriage 8 is reciprocated in the direction of arrow C in FIG. The spray nozzle 13 is rotated about the axis of the nozzle lance 11 by driving the nozzle lance rotation motor 14, and the spray nozzle 13 is pivotally rotated by forward and reverse driving of the nozzle tilt motor 27 to spray the spray nozzle 13. The repair material is sprayed from the tip of the nozzle 13 onto the inner wall surface of the exhaust gas hole 1b in a spiral shape to repair the inner wall surface.

The above-mentioned repair work is performed by an operator while holding the operation pendant 36 in his hand and looking into the inside of the upper tank 1 through the upper opening of the upper tank 1. In this repair work, the carriage moving motor 7 and the like, which are the driving parts of the spraying mechanism 5, are cooled by the cooling water circulating inside the cooling cover 31, and the temperature inside the cooling cover 31 is controlled by the control panel 34. Since the temperature is constantly maintained at a constant temperature, the drive parts can be prevented from being damaged even when the repair work is performed at a high temperature, thereby preventing malfunction of the drive parts.

In the above embodiment, the case where the inner wall surface of the upper tank 1 is repaired has been described. However, the furnace wall repair apparatus of the present invention is such that the inner wall surface of the dip pipe provided in the lower tank is replaced by replacing the nozzle. It can also be applied to repair the outer wall surface.

Further, in the above-mentioned embodiment, the one applied to the RH furnace has been described, but it goes without saying that the present invention can also be applied to the DH furnace and the like.

[0028]

Since the present invention is constructed as described above, it is possible to obtain a furnace wall repairing device which can easily perform repair work by remote control even on the horizontal wall surface of the furnace.

Further, by covering the driving mechanism for spraying with the cooling cover, the radiant heat from the furnace wall can be shut off even when repairing at high temperature, and damage to these driving mechanisms can be prevented. .

[Brief description of drawings]

FIG. 1 is an overall system diagram of a furnace wall repair device according to an embodiment of the present invention.

FIG. 2 is a front view of a spraying mechanism according to an embodiment of the present invention.

FIG. 3 is a plan view of a spraying mechanism according to an embodiment of the present invention.

FIG. 4 is a sectional view of a nozzle lance according to an embodiment of the present invention.

[Explanation of symbols]

 1 Upper Tank 1b Exhaust Gas Hole 3 Repair Truck 4 Table Lifter 5 Spraying Mechanism 6 Frame 7 Truck Moving Motor 8 Moving Truck 11 Nozzle Lance 12 Nozzle Lance Falling Motor 13 Spray Nozzle 14 Nozzle Lance Rotating Motor 27 Nozzle Tilt Motor 31 Cooling cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Mino 1-1-66 Funamachi, Taisho-ku, Osaka Nakayama Steel Works, Ltd. (72) Inventor Takayasu Fujiwara 1-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramics Co., Ltd. (72) Inventor Katsuro Yata 1-3-1 Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramics Co., Ltd.

Claims (4)

[Claims] 1. A furnace wall repair device for repairing a furnace wall by spraying a repair material onto the furnace wall, comprising: (a) a pedestal supported in a vertically movable manner on a repairable carriage. )
A spray pipe that is rotatably supported on the mount between an upright position and a horizontal position, and that conveys the repair material, and (c) is provided at the tip of the spray pipe, and A furnace wall repair device comprising a spray nozzle rotatable about an axis. 2. The furnace wall repair device according to claim 1, wherein the spray pipe is supported on a moving carriage that can move horizontally with respect to the gantry. 3. The furnace wall repair device according to claim 2, wherein the spray nozzle is provided so as to be swingable and pivotable in a plane including an axis of the spray tube. 4. A cooling cover surrounds each drive mechanism for rotating the spray tube, rotating and swinging the spray nozzle, and horizontally moving the movable carriage. The described furnace wall repair device.