JPS62429B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hot repair device for lining inside an electric furnace. The present invention relates to a hot repair device that can eject water and reduce the area occupied when stored. This is used in the technical field of repairing when the lining of an electric furnace is eroded by spraying powdered furnace material onto the worn lining surface immediately after tapping while the furnace maintains a high temperature state.

[Prior art]

Refining in an electric steelmaking furnace is carried out by melting the charged scrap with an arc emitted from an electrode. During melting, the furnace walls and bottom lining are often eroded by the high-temperature molten steel and slag. The lining that has been worn out in this way is repaired by spraying powdered furnace material in the form of a slurry under high temperature conditions immediately after tapping. The work is carried out by the worker inserting a long lance with a spray nozzle attached to the tip through the furnace side port, which requires the worker to do hard work in an extremely harsh work environment under high heat conditions. is forced. Moreover, the desired repair technique for a wide range of lining surfaces is not easy and requires skill in the spraying work.

There is a hot repair device 32 as shown in FIG. 3 that avoids such repair work by an operator. A support column 8 is installed next to the electric furnace 3, and a work arm 33 that moves up and down along the support column 8 and rotates horizontally around the support column 8 is installed. , is designed to move up and down within the furnace body along the furnace axis. A replaceable spray nozzle 35 is attached to the lower end of the nozzle holder 34, and the state is moved from the storage state shown by the one-dot chain line to the above-furnace state shown by the solid line, and then to the spraying state shown by the two-dot chain line. By rotating the nozzle holder 34 in the direction of an arrow 36, the lining surface can be repaired at a desired height. In addition, when repairing the furnace bottom lining, the condition is returned to the one shown by the dashed-dotted line, the spray nozzle is replaced with a spray nozzle with an angle suitable for spraying onto the furnace bottom, and the same transition is repeated again to reduce the supply of furnace material. The powdered furnace material pumped through the hose 14 is ejected. The sprayed furnace material adheres to the lining surface in a high-temperature state, and the moisture is evaporated to solidify the furnace material, repairing the lining at desired locations.

According to such a repair device, work under high heat is carried out mechanically and remotely, reducing the burden on the worker.Also, even when uniform repair is required around the furnace, the nozzle holder Since it is maintained vertically and on the axis of the furnace, it has the advantage that it can be easily repaired by rotating it. However, depending on the size of the electric furnace, the working arm can be as long as 7 meters, so it is necessary to secure space within the building to rotate it in front of the furnace or above the furnace. Even in the stored state shown by the chain line, the device is bulky and occupies a large area, and there are problems such as restrictions being imposed on the installation of ancillary equipment. moreover,
The spray nozzle must be replaced depending on the area to be repaired, which requires replacement work and time, resulting in a delay in hot repair, and an improvement is desired.

By the way, the elongated nozzle holding part that supports the spray nozzle is made telescopic, and a swinging mechanism is adopted that allows it to be horizontally rotated, tilted, and oscillated to arbitrarily change the ejection angle of the spray nozzle. A spray repair device for refractory materials has been proposed.
However, each mechanism for rotating, tilting, extending/contracting, and swinging requires a driving body such as a fluid pressure cylinder, which increases the number of driving devices that support and swing the spray nozzle, and the entire mechanism intersects with each other. They are arranged in a complicated way, making them extremely complex and bulky. Therefore, when the repair equipment is not in use, it must be evacuated to a separate location with sufficient space for storage, and when it is to be used, it must be transported onto the furnace, making it difficult to install the hanging arch. There is a problem in that a large space must be secured in the upper space of the factory building for the electric furnace equipment to carry it in. As a result, apart from being applied to containers such as ladles and tundishes, electric furnaces cannot be moved and cannot be easily replaced with the same item, so there is an even stronger need for quick and reliable repairs to the furnace walls. Despite this, there is a drawback that it cannot be adequately addressed. On the other hand, a device employing a four-bar parallel link mechanism as a means for moving the spray nozzle is described in, for example, Japanese Utility Model Publication No. 58-46398. According to such a mechanism, for example, when repairing the furnace outer wall, the spray nozzle located inside the furnace wall can be moved to the furnace outer wall side. However, it has the disadvantage that it is not possible to move the spray nozzle between the storage position next to the furnace and inside the object to be repaired, or to move it up and down approximately along the furnace axis within the object to be repaired, such as an electric furnace. are doing.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned problems.The purpose of the present invention is to reduce the area occupied by the electric furnace so that it can be stored in the vicinity of the electric furnace. To provide a hot repair device for an electric furnace refractory wall that can be moved up and down along an axis and can quickly perform desired repair work hot by easily changing the jetting angle.

[Structure of the invention]

The characteristics of the electric furnace refractory wall hot repair apparatus of the present invention will be explained with reference to FIGS. 1a and 1b.
The work arm is rotatably supported at two different points on a support column 8 installed on the side of the electric furnace 3, and together with these support members 9 and the support column 8 constitutes a parallelogram link mechanism 6. 10, and the parallelogram link mechanism 6 is arranged so that the lower end of the working arm 10 is vertically displaced approximately along the furnace axis inside the electric furnace 3 and retracted to the upper side of the furnace outside the electric furnace 3. A nozzle holder 5 is attached to the lower end of the working arm 10, which horizontally rotatably supports a vertically extending furnace material transport pipe 12 for pumping powder furnace material. A spray nozzle 2 is attached to the joint 20 through an articulated joint 20, and the spray nozzle 2, which spouts slurry-like furnace material mixed with water, is remotely operated via a slider 28 that moves along the furnace material conveying pipe 12. It is therefore provided so that it can swing within a vertical plane.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof. FIG. 1a is an overall schematic diagram of the hot repair equipment 1, and its configuration is roughly divided into a spray nozzle 2, an electric furnace 3, and an electric furnace 3.
It consists of an arm transition body 4 for advancing and retreating into the interior, and a nozzle holder 5 attached to the tip of a working arm 10 (described later) constituting the arm transition body 4.

The arm transition body 4 moves the spray nozzle 2 that spouts furnace material from a stored state outside the furnace to a repair position inside the electric furnace 3, and is connected to a parallelogram link mechanism 6 and a drive source 7 that drives it. It's summery.
The drive source 7 can be any desired one, such as an electric motor with a power transmission mechanism, but in this example, a hydraulic cylinder is used, the base of which is connected to a support column 8 erected near the electric furnace 3. It is mounted so that it can move freely. On the other hand, the parallelogram link mechanism 6 is
It consists of two links 9A and 9B which are supporting members 9, a supporting column 8 and a working arm 10.
That is, the two links 9A and 9B are arranged at two different fulcrums provided at both ends of the bent end portion 8a of the support column 8, and at intervals equal to the distance between the two fulcrums, and parallel to the bent end portion 8a. It is rotatably supported at two different points on the disposed work arm 10. The piston rod 7a of the link 9A is attached to the opposite side of the work arm 10 with respect to the fulcrum M so that the link 9A swings as the hydraulic cylinder 7 expands and contracts. Note that the tip of the piston rod 7a may be attached to the working arm side of the link 9A, and in that case, the vertical swing of the link 9A due to the expansion and contraction of the hydraulic cylinder 7 is simply reversed. In this way, by swinging the link 9A, the working arm 10 in the parallelogram link mechanism 6 can move up and down while always maintaining a posture parallel to the direction of inclination of the bent end portion 8a of the support column 8.

Note that the piston rod 7a of the hydraulic cylinder 7 can be attached to the link 9B to operate it in the same way, and when the link 9A is oscillated, only the tensile force is applied to the link 9B. Support members such as ropes may also be used. Furthermore, even if the support column 8 is not formed with the bent end portion 8a, it can function in the same way as long as the two support members 9 are rotatably supported at two different points on the straight support column.

A nozzle holder 5 as shown in FIG. 1b is attached to the tip of the work arm 10, which is moved up and down by the parallelogram link mechanism 6, at an angle that maintains a vertical posture at all times. This is a box made of, for example, a steel plate, in which a water jacket 11 is appropriately formed to protect the radiant heat received from the furnace body during repair work, and inside the box there is a horizontally rotatable powder furnace material pumping box that extends vertically. A furnace material conveying pipe 12 is installed. A spray nozzle 2 for spraying slurry furnace material mixed with water is provided at the lower end of the conveying pipe 12 so as to be swingable in a vertical plane.

The furnace material conveying pipe 12 is connected to a furnace material supply hose 14 through a rotary joint 13 at the upper part of the nozzle holder 5, which conveys the powdered furnace material under pressure with compressed air.
It is rotatably and vertically supported by two upper and lower bearings 15A and 15B. This furnace material conveying pipe 1
A bevel gear 16 is fixed to 2, and by meshing with a bevel gear 19 attached to a transmission shaft 18 driven by an electric motor 17 shown in FIG.
It is designed to be rotated. An articulated joint 20 is formed at its lower end, and is designed to allow the furnace material to be guided into the spray nozzle 2 regardless of how the spray nozzle 2 swings. That is, the joint joint 20 includes a nozzle support section 20a that is formed into a cylindrical shape and is integrated with the furnace material conveying pipe 12, for example.
and a cylindrical nozzle base 20b fitted onto it.
It is made up of. A wide-angle hole 21 for leading out the furnace material is opened in the nozzle support portion 20a, and communication with the furnace material conveying pipe 12 is possible at any swing angle of the spray nozzle 2. Note that a notch hole 22 having a width slightly wider than the diameter of the conveying pipe 12 is provided in the nozzle base 20b in the circumferential direction so that the spray nozzle 2 can swing without interfering with the furnace material conveying pipe 12. The tip of a water supply pipe 23 that supplies water to the powder furnace material through this notch hole 22 is opened in the nozzle support portion 20a, and the water supply pipe 23 is connected to a rotary joint 24 attached to the nozzle holder 5. . As a result, water from the water supply hose 25 is supplied into the nozzle support portion 20a via the rotary joint 24 even when the water supply pipe 23 is rotating together with the furnace material conveying pipe 12. Note that the water for turning the powder furnace material into a slurry state is not limited to the joint 20, but may be supplied to other parts of the furnace material conveying pipe 12 or into the spray nozzle 2. A small bracket 26 is integrated into the nozzle base 20b of the spray nozzle 2 that spouts out such a slurry-like furnace material, and a rod 27 connected to it with a pin is attached to a slider 28 fitted onto the furnace material conveying pipe 12. It is being Therefore, the slider 2 is moved by a vertical movement mechanism (not shown).
8 is displaced, the spray nozzle 2 can be swung around the nozzle support 20a via the rod 27, ie in a vertical plane.

According to the embodiment having such a configuration, the lining surface of the electric furnace 3 can be repaired in the following manner.

When the electric furnace 3 is in operation and the hot repair equipment 1 is at rest, the hydraulic cylinder 7 shown in FIG. Center on M and arrow 29
It is rotated in the direction shown in FIG. 2.
In this state, the parallelogram link mechanism 6 is positioned directly above the support column 8, and the elongated working arm 10 is retracted to an upper space next to the furnace. As a result, the area occupied by this apparatus when stored is reduced, and there is room for installing incidental equipment necessary for refining etc. in the vicinity of the electric furnace 3.

On the other hand, scrap or the like is charged into the electric furnace 3, and the lining of the furnace is corroded while refining is carried out. Therefore, if the furnace material is sprayed onto the worn parts of the furnace wall immediately after the steel is tapped, while the heat from melting still remains, it will adhere to the lining surface and the water will evaporate, solidifying the furnace material and causing the lining to can be repaired. for that,
The hydraulic cylinder 7 is extended as shown in FIG. 1a, and the link 9A swings in the opposite direction of the arrow 29.
The parallelogram link mechanism 6 is tilted toward the electric furnace 3 side. In such an operation, the working arm 10 moves above the furnace while always maintaining a constant inclination, that is, in this example, an inclination parallel to the bent end portion 8a of the support column 8. Working arm 10
The nozzle holder 5, which is fixedly integrated with the nozzle holder 5, is always maintained vertically, and the hydraulic cylinder 7 is extended until it reaches the furnace axis. In addition, since it is desirable to be able to perform repairs while moving the nozzle holder 5 up and down along the furnace axis, the upper limit position of the nozzle holder 5 in the furnace during repair work should be changed to the lower limit position.
The dimensions of the parallelogram link mechanism 6 and the distance from the electric furnace 3 are selected so that the nozzle holder 5 is located on the furnace axis. Then, for example, if the distance L between the supports of the link 9A is 3.7 meters, the nozzle holder 5 can be
Even when moving up and down by 1.2 meters, the maximum displacement of the nozzle holder 5 from the furnace axis in the radial direction of the furnace body is only 25 mm. Therefore, even if the spray nozzle is rotated as will be described later, the spray distance to the furnace wall is approximately the same all around, making it possible to perform repairs evenly.

When the nozzle holder 5 is disposed on the furnace shaft in this manner, powdered furnace material is fed under pressure from the furnace material supply hose 14 shown in FIG. 1b, and water is supplied from the water supply hose 25. The furnace material is supplied to the nozzle support part 20a of the joint 20 provided at the lower end of the furnace material conveying pipe 12, and water is mixed with the furnace material via the water supply pipe 23. For example, the furnace material supply hose 14 is 5Kg/cm ²
Since the pressure of G is acting, the furnace material which has become slurry due to the force is
It is supplied to the spray nozzle 2 through the wide-angle hole 21, and is vigorously sprayed from the spout port toward the lining surface. When repairing the peripheral wall while maintaining the position of the nozzle holder 5, the electric motor 17 is driven;
The furnace material conveying tube 12 is rotated via two bevel gears 19 and 16. At that time, the furnace material supply hose 14
Furnace materials from the reactor and water from the water supply hose 25 are supplied via the rotary joints 13 and 24, respectively, so that the rotation of the furnace material conveying pipe 12 is not inhibited and the supply of the furnace materials, etc. is never interrupted. By this rotation of the furnace material conveying pipe 12, the spray nozzle 2 is rotated via the joint 20 while maintaining its ejection angle.

When moving the nozzle holder 5 up and down to displace the spray nozzle 2 toward the bottom of the furnace, the hydraulic cylinder 7 is further extended. As mentioned above, the amount of displacement from the furnace axis to the furnace wall due to the vertical movement of the nozzle holder 5 is so small that it can be ignored, so even if the nozzle holder 5 is displaced, there is almost no difference in the spraying distance. There is no difference, and the entire circumference at that height position is repaired evenly. Also, although not shown, by swinging a lever using a separate push-pull cable to move the slider 28 fitted onto the furnace material conveying pipe 12 up and down, the spray nozzle 2 is supported via the rod 27. Since it swings around the portion 20a, the spout can be directed in a desired direction. Therefore, when repairing the hearth bottom, the spout can be directed downward as shown by the broken line. Of course, in that state, the furnace material conveying pipe 12
Since it can also be rotated, it goes without saying that by tilting the spout slightly, it is possible to repair the hearth bottom in a circular shape. Therefore, the entire lining can be completely repaired.
In addition, in such work, the amount of slack in the furnace material supply hose 14 that pressure-feeds the furnace material is small, and
Since there is little change in the bending due to displacement of the parallelogram link mechanism 6, variations in the amount of furnace material sprayed can be avoided. Furthermore, by making the spray nozzle longer and combining the vertical movement of the nozzle holder with the swinging motion of the spray nozzle, the spraying distance from the jet nozzle to the lining surface can be almost reduced regardless of the shape of the furnace body. It can be kept constant. As a result, the sprayed area and sprayed thickness per unit time of the furnace material supplied in a fixed amount are the same.For example, by specifying the repair area in a separately installed control box, it is possible to It is also possible to automatically perform repairs to obtain the same accuracy under the same conditions.

〔Effect of the invention〕

As can be seen from the description of the embodiments above, the present invention has the following features:
Two support members including links driven to swing,
The nozzle holder is attached to the tip of the working arm, which is rotatably supported at two different points on the support column and forms a parallelogram link mechanism together with these support members and the support column, so that it can be used near the electric furnace. In addition, during operation, the vertical position of the spray nozzle that spouts out furnace material can be maintained, and it can be raised and lowered almost along the furnace axis using the parallelogram link mechanism. . In addition, a vertically rotatable furnace material transport pipe for pumping powder furnace material is installed inside the nozzle holder, and a spray nozzle is installed at the lower end of this furnace material transport pipe to spray out slurry furnace material mixed with water. is provided to be able to swing in a vertical plane, so the jetting angle can be easily changed, and the desired repair can be carried out uniformly on the entire lining surface of the furnace wall and furnace bottom, as well as on the entire circumferential wall at a certain height. It can be carried out accurately and quickly in hot conditions without forcing the operator to do heavy labor. Of course, the furnace material that reaches the spray nozzle is transported while being thermally shielded by the nozzle holder, and the properties of the slurry furnace material, which solidifies when exposed to heat, are stabilized.

Furthermore, since the spray nozzle is remotely operated via a slider that moves along the furnace material conveying pipe and is thereby able to oscillate in a vertical plane, this may occur if the drive unit is in a high-temperature atmosphere. Easy operational failures are also avoided.

[Brief explanation of the drawing]

Fig. 1a is an overall and operational explanatory view of the hot repair device of the present invention installed next to an electric furnace, Fig. 1b is a cross-sectional view of the nozzle holder and spray nozzle etc. attached to the tip of the working arm, and Fig. FIG. 2 is a storage state diagram of the hot repair device, and FIG. 3 is an overall and operation explanatory diagram of the conventional hot repair device for electric furnace refractory walls. 2... Spray nozzle, 3... Electric furnace, 5... Nozzle holder, 6... Parallelogram link mechanism, 8...
Support column, 9...Support member, 9A...Link,
10... Working arm, 12... Furnace material conveying pipe, 20
...Joint joint, 28...Slider.

Claims (1)

[Scope of Claims] 1. Two support members including a swing-driven link are rotatably supported at two different points on a support column erected next to the electric furnace, and these support members and A working arm is provided to form a parallelogram link mechanism together with the support column, and the lower end of the working arm is vertically displaced approximately along the furnace axis inside the electric furnace, and is retracted to the upper side of the furnace outside the electric furnace. The above-mentioned parallelogram link mechanism is arranged so that the working arm has a nozzle holder attached to the lower end of the working arm to horizontally rotate a vertically extending furnace material conveying pipe for pumping powder furnace material. A spray nozzle is attached to the lower end of the furnace material conveyance pipe via an articulated joint, and the spray nozzle, which spouts slurry-like furnace material mixed with water, is remotely connected via a slider that moves along the furnace material conveyance pipe. 1. A hot repair device for a lining in an electric furnace, characterized in that the device is operable in a vertical manner so as to be swingable in a vertical plane.