JPH0320719Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a device for patching and repairing the outer peripheral surface of lance pipes, etc., and is particularly applicable to repairs ranging from relatively wide areas to small local areas. The present invention relates to a device that can perform effective repairs.

[Conventional technology]

As is well known, in the steel industry, various processing agents are used to improve the quality and productivity of molten metal, such as desulfurization, desiliconization, dephosphorization, and composition adjustment of hot metal or molten steel. It is common practice to blow lance pipes into molten metal together with an inert gas such as nitrogen or argon, and this trend is becoming more and more common.

The lance pipe used in this case is a round steel core tube for introducing gas for molten metal processing, with a blowout nozzle installed at the tip, and a large number of studs welded and attached to the outer periphery of the steel core tube. It has an elongated cylindrical shape and is formed by covering and fixing it with an unshaped refractory such as castable refractory.

When a gas injection lance pipe configured in this way is immersed in molten metal and used for gas injection, it may be exposed to the high temperature of the molten metal, the impactful flow of the molten metal, or rapid heating or cooling due to repeated use. Cracks and abnormal erosion occur in the coated refractories due to
Since it becomes unusable, it is necessary to extend its lifespan, and re-covering and repairing is carried out in a short period of time.

Conventionally, methods for repairing this damaged lance pipe have mainly been spraying repair and patching repair, but these repair methods have the following problems.

(1) For spray repair, a wet spray method is used in which fire-resistant aggregate, binder, and water are mixed in advance and made into a slurry, which is then sprayed using a spray machine. Due to high rebound loss, dust is generated, which worsens the working environment.Also, the adhesive strength between the repaired surface and the refractory material is weak, and a strong recoating layer cannot be obtained, resulting in poor durability, so it is no longer used regularly. It has not yet reached the point where it is done.

(2) The well-known packing repair is a method of repairing by manually pressing plastic refractories onto the damaged area, and there is no rebound loss and there is no concern about dust generation. etc. cannot be filled sufficiently, and the effect is small. In addition, the work requires hot work (temperature of the surface to be repaired is approximately 500 to 700°C), which poses problems in terms of the work environment.

For this reason, various attempts have been made to automate repairs to improve the work environment and take advantage of the advantages of patching repairs, which do not generate dust due to rebound loss, and to replace manual labor, but so far they have only been effective at repairing small, localized areas. There is nothing suitable.

[Problem that the invention attempts to solve]

The present invention was made with the aim of solving the above-mentioned problems of the prior art, and includes a cylindrical cylinder fixing arm that can be opened and closed and has an inner diameter larger than the outer diameter of the lance pipe.
By arranging multiple crimping cylinders so that they are driven toward the center and mechanizing them, the lance pipe's outer peripheral surface can be effectively repaired, from relatively wide areas to small local areas. This invention provides a patching repair device.

[Means to solve the problem]

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

The patching repair device for the outer peripheral surface of a lance pipe according to the present invention has a cylindrical cylinder fixing arm attached to the side of a fixed frame 1, as shown in a plan view when the lance pipes are closed together in FIG. 1 and a side view in FIG. 2 is provided so as to be openable and closable, and a plurality of crimping cylinders 3, 3, .

The cylinder fixing arm 2 is provided with a crimping cylinder 3 to be described later, and has an inner diameter similar to that of the lance pipe 6 so that the repair member 5 can be crimped onto the outer peripheral surface of the lance pipe 6 by driving the cylinder drive shaft 4.
The lance pipe is formed into a cylindrical shape larger than the outer diameter of the lance pipe, and is divided into two in the vertical direction in order to facilitate the insertion and removal of the lance pipe 6. A hinge 7 is provided at one end of the lance pipe so that it can be opened and closed freely. An arm holding member 8 is provided to hold the divided left and right cylinder fixing arms 2, 2 in a closed state.

The cylinder fixing arm 2 is formed into a semicircular arc shape with a circular cross section as shown in a perspective view of a partial cross section in FIG. 3, and has a hand rail 9 provided in two upper and lower stages.
A hand member 10 is formed on a side surface along the hand rail 9 and has a crimping cylinder 3 disposed thereon. It is being Through-holes 11 are formed at both upper and lower ends of the hand member 10, and the hand rail 9 is inserted through the through-holes 11 and engaged in a slidable manner. If the number is reduced, by controlling a small motor (not shown) mounted on the hand member 10, the hand member 10 can be arbitrarily moved and stopped along the hand rail 9 to match the repair location. It is designed so that positioning can be done by

In order to press the repair member 5 against the outer peripheral surface of the lance pipe 6 and firmly press it, it is most effective to apply pressure from the outside of the lance pipe 6 toward the center in the direction where the force is concentrated.

Therefore, the crimping cylinder 3 for crimping the repair member 5 to the outer circumferential surface of the lance pipe 6 passes through the hand member 10 and is fixed in the direction in which the cylinder drive shaft 4 is driven toward the center of the lance pipe 6. A plurality of them are arranged in the circumferential direction and the vertical direction of the member 10. A pressure jig 12 for pressurizing the repair member 5 is provided at the tip of the cylinder drive shaft 4 of each crimping cylinder 3, and when driving the cylinder drive shaft 4 to apply pressure, the entire surface of the repair member 5 is In order to pressurize the repair member 5, it is necessary to narrow the interval between adjacent pressurizing jigs 12 to minimize the area that is not pressurized by the pressurizing jigs 12, and to uniformly pressurize the entire surface of the repair member 5. It is important to arrange the crimping cylinder 3 in such a way that it can be used.

When repairing a small local area, the repair member 5 is loaded inside the hand member 10 in advance, as shown in the cross-sectional details in FIG. A vacuum suction tube 13 for preventing the repair member 5 from falling over is provided at the top, and a support cylinder 1 for supporting the repair member 5 is provided at the bottom.
4 is penetrated and fixed in the same way as the crimping cylinder 3, and the pressure of each cylinder 3, 14 can be arbitrarily set by a pressure control valve (not shown).

The repair member 5 is vitrified in molten metal, for example, so that the cylinder drive shaft 4 of the crimping cylinder 3 can be driven and the repair member 5 can be crimped onto the lance pipe 6 while being compressed by the pressing jig 12. A monolithic refractory material such as plastic refractory or castable refractory material is coated on one side of the heat-resistant felt, which is effective against erosion from molten metal and slag, and is formed into two-layer slices for storage and storage. The surface of the monolithic refractory is covered with vinyl to prevent moisture from evaporating during repairs, and the size is set to suit the area of repair.

[Effect]

When performing patching repair using the apparatus of the present invention configured as described above, the stopper of the arm holding member 8 is removed, and the cylinder fixing arm 2 is moved with the hinge 7 as the base point.
are opened to the left and right, the entire device is moved or raised so that the suspended lance pipe 6 comes to the center of the cylinder fixing arm 2, and the cylinder fixing arm 2 is closed and held by the arm holding member 8. When performing extensive repairs covering the entire circumference, the hand member 10 to which the crimping cylinder 3 is fixed is engaged with the entire circumference of the handrail 9 to form the cylinder fixing arm 2, and the monolithic refractory side is connected to the lance pipe. The repair member 5 is arranged so as to face the 6 side. When repairing a small local area, unnecessary hand members 10 may be removed from the hand rail 9 as necessary to facilitate the repair work, but in this case, the unnecessary hand members 10 may be removed from the hand rail 9 in opposite positions The same number of hand members 10 are left on the left and right cylinder fixing arms 2 so that the lance pipes 6 can be pressurized at the same time, and after loading the repair member 5, a small motor is driven to The hand member 10 left on the cylinder fixing arm 2 is moved to the repair position and to the opposite position. Furthermore, if it is not necessary to repair the opposing surfaces, the repair member 5 may not be loaded onto the hand members at the opposing positions, but may be air-pressed.

Then, the cylinder drive shaft 4 of the crimping cylinder 3
The repair member 5 is crimped onto the outer circumferential surface of the lance pipe 6. At this point, the crimping cylinders 3 at the position to be repaired and the opposite position are simultaneously driven so that the pressing force at the time of crimping is applied to the lance pipe 6. It is important to offset the pressure at the center of the crack, and when repairing a localized area such as a crack, increase the pressure in the crimping cylinder 3 at the location corresponding to the crack, and increase the pressure to increase the crimping force. increases, making it possible to carry out effective repairs. In addition, when repairing a surface due to melting damage, etc., the pressure of the crimping cylinder 3 at the center of the surface is increased preferentially to facilitate moisture and steam scattering from around the repair member 5, and then the pressure at the center of the surface is increased. By sequentially increasing the pressure of the corresponding crimping cylinders 3 from the area to the periphery and crimping the entire surface, it is possible to prevent the blistering phenomenon that tends to occur when manually applied or the like.

In the embodiment, the crimping cylinder 3 was arranged parallel to the circumferential direction and the vertical direction of the hand member 10 constituting the cylinder fixing arm 2; They may be formed into a rectangular or hexagonal shape and may be arranged in a staggered manner, and are not limited to the examples. Further, each cylinder 3, 14 may be driven by hydraulic pressure, pneumatic pressure, or electric power, but it is preferable to use a hydraulic cylinder since it generates a large force. Further, although the device for patching and repairing the outer circumferential surface of a lance pipe according to the present invention has been described as being applied to a lance pipe, it goes without saying that it can also be applied to repairing the outer circumference of similar cylindrical refractories.

[Effect of idea]

As explained above, in the present invention, a plurality of crimping cylinders are arranged radially on a cylinder fixing arm formed in a cylindrical shape, and pressure is applied simultaneously from both opposing sides toward the center of the lance pipe. Since the structure allows for crimping, the crimping is performed in the center direction using high generated force such as hydraulic pressure, without relying on the manual labor of the worker. A reliable recoating layer can be easily obtained, effective recoating repair can be performed, and durability can be significantly improved. In addition, it is possible to perform re-coating repairs using the same principle, from wide-area repairs to small local repairs, making effective use of repair materials, achieving a pressure distribution according to the damage state, and preventing blistering. and peeling can be prevented. Furthermore, by mechanizing conventional manual work, it is extremely effective to free workers from high-temperature work.

[Brief explanation of the drawing]

Fig. 1 to Fig. 4 show an embodiment of the present invention, Fig. 1 is a plan view when the device is closed and pressurized, Fig. 2 is a side view, and Fig. 3 is a part of the cylinder fixing arm. FIG. 4 is a perspective view showing a cross section, and FIG. 4 is a detailed view showing a state in which a repair member is loaded. The symbols in the figure are as follows. 1: Fixed frame, 2: Cylinder fixed arm, 3:
Crimping cylinder, 4: Cylinder drive shaft, 5: Repair member, 6: Lance pipe, 7: Hinge, 8: Arm holding member, 9: Hand rail, 10: Hand member, 11: Through hole, 12: Pressure fixing Tools, 13: Vacuum suction tube, 14: Support cylinder.

Claims (1)

[Scope of utility model registration request] Two sets of semi-cylindrical cylinder fixing arms 2 are provided on the side surface of the fixed pedestal 1 so as to be freely openable and closable. is a mechanism that slides along a hand rail 9 fitted to both upper and lower ends, and each hand member 10 has a lance formed of a plurality of crimping cylinders 3 arranged in a direction to drive them toward the center. Patching repair device for pipe outer circumferential surface.