JPS6216201Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a thermal spraying device, in particular, the opening is narrower than the vacuum chamber of a vacuum degassing device for molten metal or the container body such as a torpedo car, and The present invention relates to a thermal spraying apparatus suitable for repairing the lining of a container or the like by thermal spraying, the distance of which varies depending on the location.

It is known to repair the lining of molten metal containers by spraying. Conventionally, a plaster-like refractory material has been used for this spray repair, but it has had drawbacks such as high porosity due to the presence of moisture, a decrease in furnace wall temperature, and deterioration of adhesive strength.

Recently, a method of thermal spray repair has been proposed in which molten refractory material is sprayed through a high-temperature flame. In this method, the refractory material itself is adhered by melting, so it is highly dense, and corrosion resistance and hot strength are greatly improved.Furthermore, because the material is at a high temperature, there is no decrease in furnace wall temperature or adhesive strength. do not have.

When repairing the lining of the vacuum chamber of a RH type or DH type vacuum degassing device by thermal spraying, for example, as shown in Fig. It is inserted and fireproofing material is sprayed onto the damaged area. The synorkel 2 here is an immersion tube or a reflux tube when the vacuum degassing device is an RH type, and is a suction tube when it is a DH type. Note that the figure illustrates the RH equation.

However, when performing thermal spray repair using this method, there is no problem in repairing the inside of the snorkel 2, but when repairing the upper vacuum chamber 1, as shown in Figure B, which is a cross-sectional view taken along the line X-X of Figure A, , when spraying on the wall of part a, which is far from the 2 holes of the synorkel, the distance between the nozzle 3 and the wall becomes large, and the molten refractory material cools and solidifies before it reaches the wall, resulting in an extremely low density and adhesion. There was a problem.

The present invention makes it possible to always maintain an appropriate distance between the nozzle and the wall surface when repairing the lining of a container by thermal spraying, where the distance from the opening of the container to the inner wall surface of the container varies depending on the location. The purpose is to obtain a device that can.

That is, the present invention consists of a main arm, an auxiliary arm attached to the tip of the main arm with a joint so that the angle can be changed freely, and supply pipes for refractory powder, fuel, oxygen gas, and cooling water provided at the tip of the auxiliary arm. This thermal spraying device consists of a nozzle connected to the main arm, and a mechanism for rotating and moving the main arm.

Next, embodiments of the present invention will be described based on the drawings.

Figure 2 shows the main parts of the embodiment of the present invention, 4 is a main arm, 5 is an auxiliary arm, and although not shown in the figure, the auxiliary arm 5, which is similar in both cases, is locked by a pivot. The angle with respect to the main arm 4 is freely variable through the joint 6. The length of arms 4 and 5 is determined according to the size of the container to be repaired.Joint 6
is bent by pulling the cable 7 with a hydraulic cylinder 13 as shown in the figure, or by any other arbitrary means. The nozzle 3 provided by a pivot at the tip of the auxiliary arm 5 is disclosed in, for example, Utility Model Application No. 52-113822 and Utility Model Application No. 52-11382.
No. 113823, No. 117517, No. 117517, No. 52-
As shown in Publication No. 139320, fine powder refractory materials are melted and ejected using a flame using gaseous fuel such as propane gas or acetylene gas, liquid fuel such as kerosene, or solid fuel such as coke powder. ing. Therefore, supply pipes 8, 9, and 10 for refractory powder, fuel, and oxygen gas are connected to this nozzle 3. Further, since the nozzle 3 is exposed to the flame and the high-temperature atmosphere inside the furnace, it needs to be cooled, and a cooling water supply pipe 11 for this purpose is connected. All of these supply pipes shall be flexible.

Reference numeral 10 denotes a jacket for protecting the furnace from the high-temperature atmosphere and preventing material splashed off the furnace wall during spraying from adhering to the arm and various supply pipes, and is bent to fit the auxiliary arm 5. To,
The joints are bellows-shaped. As the rotation/advance/retreat mechanism of the main arm 4, a rotation/elevating device of a conventional thermal spraying device or spraying device can be used. Although not shown, for example, Utility Model Application No. 53-24304, Utility Model Application No.
As shown in Japanese Patent No. 55-73265, rotation is performed by a swivel joint, and lifting and lowering is performed by a rack gear or a hydraulic cylinder.

The nozzle configured in this way is connected to the snorkel 2 by the rotation/elevating mechanism 14 shown in FIG.
When the tip enters the direct air tank 1, the auxiliary arm 5 is bent by operating the cable 7, and the nozzle 3 is brought closer to the wall surface.

FIG. 2 shows the auxiliary arm 5 in a bent state, and the dotted line shows the extended state. Even with the synorkel arm 5 extended as shown in the figure, if you keep the nozzle 3 facing the wall to some extent, the synorkel 2
It can also be used for spraying repairs on the inside of. Furthermore, when the nozzle 3 is pivotally mounted, it can be oriented accurately toward the wall surface.

Fig. 3 shows an example in which the main arm and the auxiliary arm have a more rigid structure (other than the main arm, the auxiliary arm, and the nozzle are omitted). The angle of bending or the direction of the nozzle is determined by moving either one of 5' up or down. Although not shown in the figure, in order to automatically orient the nozzle toward the wall, it is possible to attach the nozzle to an auxiliary arm so that it can swing freely, and use a weight to bring the center of gravity to the bottom of the nozzle. The center of gravity may cause the nozzle to always face the wall.

As explained above, thermal spray repair has disadvantages such as non-melting of particles, increased rebound loss, and porous structure if the distance between the nozzle and the wall is not appropriate. By attaching the nozzle to the main arm so that its angle can be changed, the nozzle can be inserted into the container from the container opening.
When repairing the inner wall surface of a container by thermal spraying, the nozzle can be kept at an appropriate distance from the wall surface far from the opening.

Therefore, when the device of the present invention is used, the effects of thermal spraying are fully exhibited, and the service life of the vacuum degassing device container lining can be significantly extended by repair.

[Brief explanation of the drawing]

Figure 1A is a state of repair using a conventional repair device, B is a sectional view taken along the line X-X in Figure 1, Figure 2 is a side sectional view of the main part of an embodiment of the present invention, and Figure 3 is another example of the present invention. FIG. 3 is a side view of main parts of the embodiment. 3... Nozzle, 4, 4'... Main arm, 5,
5'...Auxiliary arm, 9...Supply pipe, 11...Rotation/elevating mechanism.

Claims (1)

[Scope of utility model registration request] A main arm, an auxiliary arm attached to the tip of the main arm with a joint so that the angle can be changed freely, and a nozzle provided at the tip of the auxiliary arm and connected to supply pipes for refractory powder, fuel, oxygen gas, and cooling water. , a thermal spraying device comprising a rotating/elevating mechanism for the main arm.