JPS6234239Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spray repair device suitable for repairing the lower end surface of a vacuum degassing device immersion tube.

The circulation pipes and immersion pipes associated with vacuum degassing equipment such as the RH type and DH type are severely damaged by being immersed in molten steel or by molten steel flowing through them, and have an extremely short lifespan. For this reason, spraying repairs have traditionally been performed. For example, it can also be seen in Utility Model Application No. 50-102 and Utility Model Application No. 51-87601.

Conventional equipment for this spray repair generally uses a vertical nozzle such as 1b shown in FIG. This nozzle 1b has a spout 2b at the tip oriented in the horizontal direction, and has a dipping pipe A and a reflux pipe B.
There is no problem when spraying on the inner and outer circumferential surfaces of the repaired surface because the angle with the surface to be repaired is almost a right angle, but it is difficult to spray because the angle is parallel to the lower end surface. Therefore, the inventors of the present invention considered spraying upward from directly below the immersion tube A, but the lower end surface has a certain width, and it is difficult to do this by simply spraying upward using conventional equipment. It was not possible to repair it uniformly. In addition, manual repairs involve work directly under the immersion pipe, where it is exposed to the danger of high-temperature falling objects and heat.
There were problems in terms of safety and efficiency.

The object of the present invention is to provide a spray repair device that does not have the above-mentioned problems when repairing the lower end surface of a dip tube.

The feature of this invention is that the upper part of the vertical nozzle with the spout facing upward is bent and eccentric.
Further, the present invention is a spray repair device for a vacuum degassing device in which the vertical nozzle is eccentrically attached to a rotating table.

Next, the embodiment of the present invention will be described in detail with reference to the drawings. First, in the front cross-sectional view of FIG. It can be raised and lowered freely. The vertical nozzle 1a may be raised and lowered not only by this, but also by raising and lowering a rotating table 5, a traveling carriage 6, a base 7, etc., which will be described later. Further, if the height of the immersion pipe A to be repaired is always constant, such lifting and lowering drive is not necessary.

The vertical nozzle 1a is eccentrically attached to the rotating table 5. The distance between the center of the swivel table 5 and the vertical nozzle 1a is made to match the radius of the immersion tube A. Although the swivel base 5 may be something like a arm for holding the vertical nozzle 1a, it is preferably a disc type as shown in the figure from the viewpoint of protection against falling objects such as spraying material, and from the viewpoint of left-right balance.

The swivel base 5 has a gear 9 with its shaft 8 as an axis.
a and a gear 9b which meshes with this and rotates by a motor 10a. As a result, the vertical nozzle 1a can freely rotate directly below the immersion tube A in its circumferential direction.

The swivel base 5 can also be mounted on a traveling carriage 6 and run under the vacuum degassing device C to facilitate position setting of the vertical nozzle 1a. When the traveling carriage 6 is further mounted on the traveling parent carriage 11, the traveling parent carriage 11 performs the large movement to transfer the spraying device to the bottom of the vacuum degassing device C, and the traveling carriage 11 makes slight movements to accurately direct the vertical nozzle 1a toward the surface to be repaired. It can be done in 6.
Although the driving devices for the traveling trolley 6 and the traveling main trolley 11 are not shown in the figure, in addition to manual pushing, they can be pulled by cables,
Alternatively, it may be driven by a motor.

Figure 2 shows the vertical nozzle 1a and its rotational drive device 3.
An enlarged cross-sectional view of the portion is shown. The vertical nozzle 1a is rotatable by a gear 9c having the vertical nozzle 1a as an axis and a gear 9d meshing with the gear 9c and rotating by a motor 10b. Reference numeral 12 denotes a support for supporting the vertical nozzle 1a on the casing 13.

The vertical nozzle 1a has a material hose 15 rotatably connected to its lower end via a swivel joint 14. The rear end of the material hose 15 is connected to a material pumping device, but this material pumping device is not illustrated because it is no different from that used in conventional spray repair equipment.

Although the mounting position of the water hose 16 is not particularly limited, it is preferably near the tip of the vertical nozzle 1a in order to prevent nozzle clogging. water hose 1
In order to prevent the water hose 6 from rotating together with the rotation of the vertical nozzle 1a, in this embodiment, a fixed enclosure 17 to which the water hose 16 is connected and a rotating enclosure 18 that slides on this and rotates together with the vertical nozzle 1a are used. The water jacket 19 configured by the combination is connected to the vertical nozzle 1a.
The water hose 16 is connected to the hydrogenation ring 20 via the water jacket 19. If the vertical nozzle 1a rotates back and forth, the water hose 16
By making the water hose 1 flexible
The above-mentioned means for preventing rotation of 6 is not necessarily required.

The vertical nozzle 1a is eccentrically bent by bending its upper part with the jet nozzle 2a directed upward as shown in the figure. The distance between the rotation axis of the vertical nozzle 1a and the ejection port 2a is determined according to the wall thickness of the immersion tube A.

The operation of the spray repair device configured as described above will be explained based on FIG. 1 and FIG. position.

Next, after the shaft 8 of the swivel base 5 is positioned on the center line of the immersion tube A by the traveling cart 6, the distance between the vertical nozzle 1a and the lower end surface of the immersion tube A is adjusted by the cylinder drive device 4.

In this state, the vertical nozzle 1a and the rotating table 5 attached thereto are rotated by driving the motors 10b and 10a. At the same time, water and material are supplied from material hose 15 and water hose 16, respectively. As a result, the vertical nozzle 1a sprays a slurry-like spray material onto the lower end surface of the immersion tube A, and further rotates along the lower end surface of the immersion tube A.

The operation of the vertical nozzle 1a will be described in more detail based on FIG. 4. When the vertical nozzle 1a is continuously rotated and turned along the lower end surface of the immersion tube A, the entire lower end surface is repaired at the same time as this turning. In addition, as another operation, the jet nozzle 2a of the vertical nozzle 1a is fixed toward the outside of the lower end surface as shown by the solid line, and in this state, the swivel base 5 is rotated to repair the outside of the lower end surface, and then As shown by the dotted line, the vertical nozzle 1a is fixed by inverting it by 180 degrees, and by rotating it with the swivel table 5, the inner side is repaired this time, and the entire lower end surface is repaired.The nozzle is fixed and spraying is performed. You can also do that.

In an RH-type vacuum degassing device that has multiple immersion pipes A, when one repair is completed, the main carriage 11 is fixed in that position, and only the carriage 6 is moved to connect the vertical nozzle. 1a can be positioned directly under the other immersion pipe, and then the spraying repair can be carried out in the same manner as described above.

Although not shown in the above embodiment, a conventional type vertical nozzle is further attached to the swivel table 5, and in addition to repairing the lower end surface in the present invention, the immersion pipe A
It is also possible to construct a spray repair device with multiple functions for repairing the inner and outer circumferential surfaces of.

As mentioned above, in the repair of vacuum degassing equipment, this invention can uniformly and easily repair the lower end surface of the dip tube, which was difficult with conventional spray repair equipment, by using the unique nozzle shape and its rotational movement. Can be sprayed for repair. Therefore, it is possible to extend the life of the immersion tube, reduce the number of repairs, and greatly contribute to improving the operating rate of the vacuum degassing device.

In addition, repairing the lower end surface of the immersion tube is a work that involves the danger of high-temperature falling objects and hot air, and carrying out this work with the device of the present invention has a great safety effect.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the vertical nozzle and its rotational drive unit, Fig. 3 is a conventional device in a state of spray repair, and Fig. 4 is an embodiment of the present invention. Shows the state of spray repair. 1a, 1b...vertical nozzle, 2a, 2b...spout port, 5...swivel base, 6...traveling trolley.

Claims (1)

[Scope of utility model registration request] A spray repair device for a vacuum degassing device, wherein the upper part of a vertical nozzle with an upwardly directed spout is bent to make it eccentric, and the vertical nozzle is eccentrically attached to a rotating table.