JP2002243372A - Refractory material spraying apparatus and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refractory material spraying apparatus and a refractory material spraying method in which an amount of spraying can be controlled in response to an adhered state of the spraying material, its rebound loss can be reduced, and a thickness of a worked member can be made constant. SOLUTION: There is provided a spraying apparatus comprising a running boggie 4 which can freely run; a lateral running boggie 7 which can run in a direction substantially perpendicular to a running direction of the running boggie; a lift frame 13 arranged at the lateral running boggie 7 in such a way that it can be turned and ascended or descended; a material supplying pipe 19 fixed to the lift frame; and a spraying nozzle 23 for discharging sprayed material supplied by the material supplying pipe. A distance meter 40 is arranged one by one at both sides in a moving direction of the spraying nozzle with the spraying nozzle being held. The spraying operation is carried out while a position of the spraying nozzle is being automatically controlled in response to a measured value measured by the distance meter, in such a way that a distance between the spraying nozzle and a repaired surface may become constant under application of this spraying apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for spraying refractory onto a blast furnace tapping gutter in a steel mill, a tundish of a continuous casting machine, a ladle, and the like.

[0002]

2. Description of the Related Art Conventionally, in repairing a tapping gutter of a blast furnace or a tundish of a continuous casting machine, a casting frame is set inside these, and a refractory kneaded in a slurry form (hereinafter referred to as "castable"). Is pumped by a pump or conveyed by a conveyor and poured into a gap between a casting frame and a gutter or a tundish, or a castable mixed with a mixer is received by a movable hopper, and the hopper is moved. A repair method such as pouring into the gap has been used.

In such pouring, it is necessary to remove the pouring frame from the gutter or tundish after the castable is hardened, and it takes 3 to 4 days for repair including hardening time. There were drawbacks. Furthermore, when setting the pouring frame, it is necessary to break not only the embrittled parts to remove the refractory but also the sound parts at the time of disassembly before repairing, in order to secure voids for uniformly pouring castables with high viscosity. There was also a drawback that the amount of castable construction would increase.

As a method of solving these disadvantages, a repair method has been adopted in which a castable is directly blown onto a wall surface of a gutter or a tundish without using a casting frame. Further, a mechanical spraying device has been proposed, for example, in Japanese Patent Application Laid-Open No. H10-212512, in which an angle is sprayed on any spraying repair surface so that even one worker can perform a stable spraying repair.

[0005]

However, in the spraying device disclosed in Japanese Patent Application Laid-Open No. 10-212512, the spraying distance (the distance between the spraying nozzle and the sprayed repair surface) or the spraying distance is determined based on the refractory damage profile before construction. The operation of the spray nozzle and the supply amount of the spray material are controlled, and the actual spray result is not fed back to the running and traversing operation of the spray nozzle, so that the difference in the adhesion state of the spray material cannot be followed. There is.

Further, the actual thickness of the construction body formed by spraying construction cannot be grasped during construction, and as a result, the thickness of the construction body varies, and the construction body surface after construction has irregularities. Will be. In this case, there are problems such as the necessity of manual repair again after the spray repair and the durability of the construction body is reduced. Also, even after dismantling, the gutters and tundish are still hot, and manual repair work in such an environment is not preferable.

Furthermore, since the spraying distance is set in advance, if the spraying distance varies due to unevenness of the spraying surface or the like, the drop amount of the spraying material that should originally adhere to the spraying surface and become a construction body ( There is also a problem that the use amount of the spraying material necessary for obtaining a construction body having a predetermined thickness is unnecessarily increased.

[0008] The present invention has been made in view of the above circumstances,
The object is to provide a refractory spraying device and a spraying method capable of reducing reband loss and keeping the thickness of a construction body constant when repairing a refractory using a mechanical automatic spraying device. To provide.

[0009]

According to a first aspect of the present invention, there is provided a refractory spraying apparatus, comprising: a traveling vehicle capable of traveling on rails;
A traversing vehicle mounted on the upper part of the traveling vehicle so as to be able to travel in a direction substantially perpendicular to the traveling direction of the traveling vehicle, an elevating frame provided on the traversing vehicle so as to be capable of turning and elevating, In a refractory spraying device including a fixedly provided material supply pipe and a spray nozzle for discharging a spray material supplied by the material supply pipe, a refractory spraying device is provided on both sides in the moving direction of the spray nozzle with the spray nozzle interposed therebetween. In addition, at least one or more distance meters for measuring the distance in the same direction as the spray direction of the spray nozzle are provided.

A method for spraying a refractory according to a second aspect of the present invention is a method for spraying a refractory using the spraying device according to the first aspect of the present invention, wherein a distance between a spray nozzle and a repair surface is set. In addition, the spraying is performed while automatically controlling the position of the spraying nozzle based on the value measured by the distance meter.

A method for spraying a refractory according to a third aspect of the present invention is a method for spraying a refractory using the spraying device according to the first aspect of the present invention, wherein the surface shape of the repaired surface is measured in advance by the distance meter. The spraying is performed while controlling the moving speed of the spraying nozzle according to the surface shape.

A method for spraying a refractory according to a fourth aspect of the present invention is a method for spraying a refractory using the spraying device according to the first aspect of the present invention, wherein the surface shape of the repaired surface is measured in advance by the distance meter. The moving speed of the spraying nozzle is controlled in accordance with the surface shape, and the position of the spraying nozzle is automatically controlled based on the value measured by the distance meter so that the distance between the spraying nozzle and the repair surface becomes a set value. It is characterized by performing spraying while performing.

In the refractory spraying apparatus according to the present invention,
Since a distance meter is set, it is possible to keep the distance between the repair surface and the spray nozzle constant during spraying construction, and if the surface shape of the repair surface is grasped in advance with a distance meter, The moving speed of the spray nozzle can be controlled in accordance with the surface shape of the repair surface, so that a stable spray construction body can be obtained, and the work time and spray material required for repair can be reduced.
In addition, since two or more rangefinders are provided with the spray nozzle interposed therebetween, the thickness of the sprayed body can be immediately grasped, and feedback to the optimum spray condition can be easily performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, taking repair of a tapping gutter of a blast furnace cast floor as an example.
FIG. 1 is a side view showing a part of one embodiment of a refractory spraying apparatus according to the present invention, FIG. 2 is a plan view of FIG.
FIG. 3 is a diagram showing details of a lifting frame portion of FIG.
FIG. 5 is a view obtained by rotating the elevating frame portion of FIG. 3 by 90 degrees, FIG. 5 is a cross-sectional view taken along the line XX of FIG. 3, FIG. 6 is an enlarged cross-sectional view of the spray nozzle portion of FIG. 1 is a view showing the entire refractory spraying apparatus according to the present invention.

As shown in FIGS. 1 and 2, a rail 2 is laid in the width direction of the upper part of the gutter 1 to be repaired. 4, and a pair of guide rails 5, 5 fixed in a direction substantially perpendicular to the traveling direction of the traveling vehicle 4 are provided above the traveling vehicle 4. Is mounted with a traversing carriage 7 that can be driven by an electric cylinder 6. The rail 2 is laid using an overhead traveling crane (not shown) or the like.

On the upper surface of the traversing carriage 7, one end is provided with a pin 8 on a bearing 4a provided on the upper surface of the traversing carriage 7.
And a tilting table 9 whose other end can be tilted about a pin 8. The tilting table 9 is provided with an electric cylinder 10 supported by a column 4 b provided on the upper surface of the traversing carriage 7. Due to the expansion and contraction, it is possible to tilt around the pin 8.

On the upper surface of the tilting table 9, there is provided a swivel 11 which can be rotated over a range of 360 degrees by a motor 12, and as shown in FIGS. 3, 4 and 5, A cylindrical lifting frame 13 is inserted therethrough. A pair of projecting guide members 14, 14 are provided on the outer periphery of the lifting frame 13.
The upper and lower guide rollers 4 and 14 are engaged with a pair of upper and lower guide rollers 15 and 15 provided on the revolving base 11 side, and the rotation of the elevating frame 13 in the circumferential direction is restricted by this engagement. That is, the lifting frame 13 rotates together with the swivel table 11.

A vertically extending rack gear 16 is fixed to the outer periphery of the elevating frame 13 at a substantially intermediate position between the guide members 14 and 14, and is engaged with the rack gear 16.
On one side, a pinion gear 17 and a motor 18 for rotating the pinion gear 17 are provided. When the pinion gear 17 is rotated by driving the motor 18, the lifting frame 13 is moved through the rack gear 16 meshing with the pinion gear 17.
Can be raised and lowered. As described above, the lifting frame 13 is rotatable with respect to the traveling vehicle 4 and is capable of moving up and down. In addition, since the lifting frame 13 is positioned so as to protrude forward from the traveling vehicle 4, it can be brought close to the wall of the gutter 1.

The material pressure pump 3 is mounted on the lifting frame 13.
A material supply pipe 19 for receiving the spray material is inserted therethrough, and a lower end of the material supply pipe 19 projecting from a lower portion of the elevating frame 13 has a meandering portion 2 which projects and curves to one side.
0, and the tip portion 20a of the meandering portion 20 is formed so as to face in the horizontal direction. An upper end of a nozzle pipe 21 bent approximately 90 degrees is rotatably connected to the distal end portion 20 a via a rotary joint 22.
A spray nozzle 23 serving as a discharge port of the spray material is provided at the tip of the nozzle 1. The material supply pipe 19 is fixed to the lifting frame 13 and is synchronized with the movement of the lifting frame 13.

Further, as shown in FIG.
An electric cylinder 24 is arranged upward on a support portion 13a provided on the outer side of the upper part of the cylinder, and a cylinder rod of the electric cylinder 24 is connected to one end side of a rod 25 inserted through the elevating frame 13, The rod 25 is raised and lowered by the operation of the electric cylinder 24. As shown in FIGS. 4 and 6, an arm 26 is fixedly mounted on the upper portion of the nozzle pipe 21, and the other end of the rod 25 is connected to the arm 26.
With the operation described above, the nozzle pipe 21 is rotated about the rotary joint 22 as a rotation axis via the rod 25.

An air hose 27 and a binder hose 28 are connected to the base 23a of the spray nozzle 23, respectively.
7 passes through the inside of the lifting frame 13 as shown in FIG.
Are connected to a binder supply pump 29 and a compressed air supply source 30 outside the apparatus. The base end of the material supply pipe 19 is connected to the front end of a material hose 32 via a rotary joint 31, and the base end of the material hose 32 is connected to a material pump 34.

Further, at the base 23a of the spray nozzle 23, one distance meter 40 is provided on each of the left and right sides of the spray nozzle 23. The distance meter 40 measures the distance to the wall surface of the gutter 1 in the same direction as the blowing direction of the blowing nozzle 23, and for example, a laser distance meter or the like can be used. The value measured by the distance meter 40 is the cable 37
Is input to the control device 41 disposed outside the spraying device. In this embodiment, the distance meter 40 is 2
Although at least one is installed on each of the left and right sides with the spray nozzle 23 interposed therebetween, two or more may be installed on each of the right and left sides. In the cable 37, power supply and control signal wiring are also provided. Reference numeral 38 in FIGS. 1 and 2 is a remote wired pendant switch.

Next, a method of spraying and repairing the gutter 1 using the spraying apparatus having such a configuration will be described. First,
The rail 2 is set on the gutter 1. It is preferable that the rail 2 has an integral frame structure and that a jack and a level are attached to a corner portion so that the rail 2 can be installed in a short time. Then, the spraying device according to the present invention is mounted on the rail 2,
The cable 37, the material hose 32, the air hose 27, and the binder hose 28 are each connected to a supply source.

In the case of repairing by the spraying device according to the present invention, the following three operating methods can be adopted, and the operating method to be repaired is set in advance based on the damage state of the repaired part and the like. .

The first operation method is that before the spray repair,
A method in which the spraying distance is set in the control device 41 in advance, and the position of the spraying nozzle 23 is automatically controlled so that the measured value of the spraying distance matches the set value while always measuring the spraying distance with the distance meter 40 at the time of spraying. It is. According to the first operation method, the repair can be performed while always maintaining a constant spray distance.

In the case of repairing the side wall of the gutter 1 by the first operation method, for example, while the traveling vehicle 4 is traveling at a constant speed, the position of the traversing vehicle 7 is automatically controlled based on the measured value of the distance meter 40. When repairing the bottom surface of the gutter 1, for example, while the traveling vehicle 4 or the traversing vehicle 7 is traveling at a constant speed, the position of the lifting frame 13, that is, the height of the spray nozzle 23 is moved by the motor 18 by a distance. Automatic control may be performed based on the measurement value of the total 40. Further, when the end surface (narrow surface) of the gutter 1 is repaired, for example, the position of the traveling vehicle 4 is measured while the traversing vehicle 7 is traveling at a constant speed. 4
What is necessary is just to perform automatic control based on the measured value of 0.

[0027] The second operating method is that before the spray repair,
The traveling vehicle 4 or the traversing vehicle 7 is moved in the moving direction of the spray nozzle 23 at the time of spraying, the distance to the repair surface is continuously measured by the distance meter 40, and the repair direction of the spray repair surface is calculated from the measured value. Is stored in the control device 41, and at the time of spraying, the moving speed of the spray nozzle 23 is controlled in accordance with the unevenness of the wall surface in the spraying direction to perform repair. According to the second operation method, by reducing the traveling speed of the spray nozzle 23 in the concave portion of the repair surface, the thickness of the construction body in the concave portion of the repair surface can be increased. Can be.

When the side wall of the gutter 1 is repaired by the second operation method, for example, before the spraying repair, the traversing carriage 7
The traveling vehicle 4 is moved without moving, and the shape of the repair surface in the traveling direction of the traveling vehicle 4 is stored in the control device 41. At the time of spraying, the speed of the traveling vehicle 4 is controlled according to the uneven shape of the repair surface. When the bottom surface of the gutter 1 is to be repaired, for example, the traveling truck 4 or the traversing truck 7 is moved before the spraying repair, and the shape of the repair surface in the repair direction is stored in the control device 41. At the time of spraying, the speed of the traveling trolley 4 or the traversing trolley 7 may be controlled according to the uneven shape of the repair surface. Further, when repairing the end surface (narrow surface) of the gutter 1, for example, the spray repair is performed. Before moving the trolley 4 without moving the trolley 4, the shape of the repair surface in the traveling direction of the trolley 7 is stored in the control device 41, and at the time of spraying, the traverse moves according to the uneven shape of the repair surface. The speed of the carriage 7 may be controlled.

The third operation method is a method in which the contents of the first operation method and the second operation method are simultaneously performed for repair. In other words, the position of the spray nozzle 23 is controlled based on the measurement value of the distance meter 40, and the moving speed of the spray nozzle 23 is controlled in accordance with the surface shape of the repair surface measured in advance to perform the repair. According to the third driving method, the repair can be performed while always maintaining a constant spraying distance, and the traveling speed of the traveling vehicle 4 or the traversing vehicle 7 is reduced in the concave portion of the repair surface, so that the concave portion of the repair surface is formed. Since the thickness of the construction body can be increased, irregularities on the construction body surface can be reduced.

When the side wall of the gutter 1 is repaired by the third operation method, for example, before the spraying repair, the traversing truck 7 is repaired.
The traveling vehicle 4 is moved without moving the vehicle, and the shape of the repair surface in the traveling direction of the traveling vehicle 4 is stored in the control device 41. At the time of spraying, the position of the traversing vehicle 7 is automatically determined based on the measurement value of the distance meter 40. In addition to the control, the speed of the traveling vehicle 4 may be controlled according to the uneven shape of the repair surface. When the bottom surface of the gutter 1 is repaired by this method, for example, the traveling carriage 4 or the traversing carriage 7 is moved before the spray repair.
The shape of the repair surface in the repair direction is stored in the control device 41, and at the time of spraying, the spray nozzle 23 is
Is automatically controlled based on the value measured by the distance meter 40, and the speed of the traveling vehicle 4 or the traversing vehicle 7 may be controlled according to the unevenness of the repair surface. In addition, the gutter 1
In the case of repairing the end face (narrow surface), the trolley 7 is moved without moving the traveling trolley 4 before the spraying repair, and the shape of the repair surface in the traveling direction of the trolley 7 is controlled. What is necessary is just to store it in the device 41, and at the time of spraying, to automatically control the position of the traveling vehicle 4 based on the measurement value of the distance meter 40, and to control the speed of the traversing vehicle 7 according to the uneven shape of the repair surface.

In the first to third operating methods, the actual spray thickness is measured at the time of construction to calculate the amount of adhesion of the sprayed material, and the calculated amount of adhesion is used as the traveling speed of the traveling vehicle 4. Feedback is preferred. By doing so, the thickness of the construction body can be managed. The measurement of the spray thickness during construction can be obtained from the difference between the measured values of the distance meter 40 provided before and after the spray nozzle 23 in the traveling direction. In the first to third operation methods, it is necessary to adjust the rotation position of the lifting frame 13 so that at least one distance meter 40 is arranged before and after the spray nozzle 23 in the traveling direction. There is.

Since the spraying distance varies depending on the structure of the spraying nozzle 23, it may be determined in advance by separately performing a spraying test or the like, or may be reset from the results of the initial spraying. Normally spraying distance is 200-8
The range is about 00 mm, and is often around 400 mm. Although the driving of the traveling trolley 4 and the traversing trolley 7 is preferably controlled automatically, the traversing trolley 7 alone may be operated automatically.

In the spray repair, usually, the bottom surface (laying surface) is first performed, and then the spraying is performed in order from the lower portion to the upper portion of the side wall. When spraying the bottom of the gutter 1,
The electric cylinder 24 provided on the lifting frame 13 is operated to set the spray nozzle 23 to the downward position, and the construction is performed by the above-described first to third operation methods. However, in the case of the bottom surface, there is essentially no reband loss.
The distance between the tip of 3 and the spraying surface may be set to an optimum size, and the traveling trolley 4 or the traversing trolley 7 may be run at a constant speed at the height position for repair.

When the spraying of the bottom surface is completed, the spraying nozzle 23 is turned to the side wall surface by the operation of the electric cylinder 24, and the lifting frame 13 is sequentially raised by the first to third operating methods, and the lower and upper frames are moved upward. Spray the side wall to the end. On the opposite side wall surface, the swivel 11 is rotated 180 degrees by the motor 12
3 is sprayed toward the opposite wall surface in the manner described above. When spraying the end surface (narrow surface) of the gutter 1, the swivel 11 is rotated so that the spray nozzle 23 is directed to the end wall surface, and the construction is performed by the first to third operation methods.

The driving operation employs either the remote wired pendant switch 38 shown in FIGS. 1 and 2 or the most suitable operation method of the radio control so that the operator can get on the traveling vehicle 4 or easily see the spraying state. can do.

A deck or the like is provided in the upper part near the tap hole like a blast furnace tapping gutter of an ironworks, and when there is a height restriction, the tilting table 9 is tilted and the elevating frame 13 is tilted. Adjusting the height enables uniform construction even in places with height restrictions.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the spraying device of the present invention shown in FIGS. In the first embodiment, the spraying distance is 400 mm.
In this case, only the position of the traversing carriage was controlled based on the measured value of the distance meter so that the traveling carriage was driven at a constant speed of 8 m / min. In the second embodiment, in repairing the side wall on the opposite side, the speed of the traveling vehicle is controlled in addition to the control of the traversing vehicle. The vehicle was controlled to run at a low speed of min. Also, for comparison, when the spraying device was used and the spraying was carried out with only the initial setting without performing the control by the distance meter (conventional example 1), the operator further holds the spraying nozzle and manually (Conventional Example 2) was also performed.

In each of the spraying operations, the discharge amount of the spraying material was 7 ton / hr, and all other conditions of the spraying material and the binder amount were the same. Then, the riband loss was calculated from the amount of the sprayed material that had fallen to the lower portion after the construction under the respective conditions, and the apparent porosity was measured with a partly taken construction. Table 1 shows the spraying conditions, riband loss, and apparent porosity. In Examples 1 and 2, the reband loss was 5% or less, and a reduction effect of about 1% or more as compared with Conventional Example 1 was recognized. Example 2
Thus, a uniform and dense product was obtained without unevenness on the finished surface of the construction body, and the durability of the subsequent hot-rolling was higher than before.

[0039]

[Table 1]

[0040]

According to the present invention, the problem of instability of the spraying distance in the conventional spraying construction can be solved, and a small number of workers can stably perform spraying on all spraying surfaces. And since the spraying at the optimum distance is always achieved, the spraying work is excellently stabilized, and the reband loss amount of the refractory can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a part of an embodiment of a refractory spraying apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram showing details of a lifting frame portion of FIG. 1;

FIG. 4 is a view in which a lifting frame portion of FIG. 3 is rotated by 90 degrees.

FIG. 5 is a sectional view taken along line XX of FIG. 3;

FIG. 6 is an enlarged cross-sectional view of the spray nozzle of FIG. 3;

FIG. 7 is a view showing the entire refractory spraying apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gutter 2 Rail 4 Traveling trolley 7 Traversing trolley 9 Tilt table 11 Swivel table 13 Elevating frame 19 Material supply pipe 20 Meandering part 21 Nozzle pipe 22 Rotary joint 23 Spray nozzle 40 Distance meter 41 Control device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 7/00 B05D 7/00 L (72) Inventor Akio Shimomura 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Teruo Maehara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Takashi Inoue 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon F-term (reference) in Kokan Kogyo Co., Ltd.

Claims (4)

[Claims] 1. A traveling vehicle capable of traveling on rails, a transverse vehicle mounted on an upper portion of the traveling vehicle so as to be able to travel in a direction substantially perpendicular to the traveling direction of the traveling vehicle, and capable of turning and ascending and descending. An elevating frame provided on the traversing trolley, and a material supply pipe fixed to the elevating frame,
A spray nozzle that discharges the spray material supplied by the material supply pipe, in the same direction as the spray direction of the spray nozzle on both sides in the moving direction of the spray nozzle across the spray nozzle. A refractory spraying device, characterized in that at least one or more rangefinders for measuring the distance are arranged. 2. A method for spraying a refractory using the spraying device according to claim 1, wherein a value measured by the distance meter is set so that a distance between a spray nozzle and a repair surface becomes a set value. A method for spraying a refractory, wherein the spraying is performed while automatically controlling the position of a spray nozzle. 3. A method for spraying a refractory using the spraying device according to claim 1, wherein a surface shape of the repaired surface is measured in advance by the distance meter, and a spray nozzle of the spraying nozzle is measured in accordance with the surface shape. A method for spraying refractories, wherein spraying is performed while controlling a moving speed. 4. A method for spraying a refractory using the spraying device according to claim 1, wherein a surface shape of a repair surface is measured in advance by the distance meter, and a spray nozzle of the spraying nozzle is measured in accordance with the surface shape. While controlling the moving speed, so that the distance between the spray nozzle and the repair surface is a set value,
A method for spraying a refractory, wherein the spraying is performed while automatically controlling a position of a spray nozzle based on a value measured by the distance meter.