JPH0630836Y2 - Vacuum degassing furnace Snorkel repair device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a repairing device for a vacuum degassing furnace snorkel unit equipped with a nozzle centering device.

(Prior Art) Vacuum degassing furnaces such as RH type and DH type that perform degassing treatment of molten steel and component adjustment are equipped with a snorkel part called a dip pipe and a reflux pipe at the lower end thereof. Molten steel flows inside the snorkel portion, so that wear is significant. Therefore, the snorkel part is repaired at any time.

Various types of snorkel repair devices have been proposed. For example, a cylindrical core and a nozzle having a curved upper end are inserted by a worker from below the snorkel portion, and while the worker supports and rotates the nozzle, between the core and the inner peripheral surface of the snorkel portion, There is known a device for injecting a repair material from the tip of the nozzle (for example, JP-A-50-8702). Since this device supports an indeterminate refractory as a repair material with a core, the repair material has a finer structure and more accurate repair than a spraying device or the like.

(Problems to be solved by the invention) In the above-mentioned repair using the core, since the repair material is distributed between the outer circumference of the core and the inner circumference of the snorkel by rotating the nozzle, the centering of the core is performed. Must be done accurately. However, this centering is an operation under high temperature that receives the residual heat of the furnace, and is not easy.

Therefore, the centering of the nozzle is not accurately performed, and the nozzle comes into contact with the inner peripheral surface of the snorkel portion or the core, and does not rotate smoothly. The repair material dropped without being put into the part to be repaired, which reduced the efficiency of the repair work.

An object of the present invention is to provide a repair device equipped with a nozzle centering device in order to solve the above problems.

(Means for Solving the Problem) The present invention will be described with reference to the drawings of the embodiments. A cylindrical core 2 inserted into a snorkel part 1 of a vacuum degassing furnace after use is attached to a tip of the core 2 from below. Insert the curved nozzle 3,
In a repair device for a snorkel part of a vacuum degassing furnace in which a repair material is introduced from the tip of a nozzle 3 between an inner peripheral surface of the snorkel part 1 and a core 2, a base end of the repair device is attached to a side surface of a vertical part of the nozzle 3. A plurality of space rods 4 are provided symmetrically with respect to the axis of the nozzle 3, and a cable 5 having a lower end extending below the core 2 is provided. Repairing a snorkel part of a vacuum degassing furnace, which is equipped with a centering device for a nozzle in a core, which is connected to the space bar 4 and towable the space bar 4 by pulling the cable 5. It is a device.

(Operation) When the nozzle 3 is inserted into the core 2, the space bar 4 is pulled upward by pulling the cable 5 or loosened the cable 5 and directed downward by its own weight. Is loosened or pulled to position the space bar 4 on the inner diameter line of the core in the horizontal direction and slidably contact the tip with the inner wall surface of the core. Send out. Then, as the nozzle rotates, the space bar 4 swirls with its tip sliding on the inner peripheral surface of the core and holds the nozzle on the inner core axis of the core, and from the nozzle tip to the outer peripheral surface of the core and the wall surface of the snorkel part. The repair material is surely distributed between them.

(Embodiment) An embodiment of the present invention and a method of using the same will be described below with reference to the drawings.

The figure shows a situation in which the snorkel part is repaired by using the repair device according to the embodiment of the present invention.

In the longitudinal sectional view of FIG. 1, reference numeral 1 is a snorkel portion to be repaired. The inner peripheral surface is damaged because it has been used.

Reference numeral 2 is a core which is inserted into the snorkel portion from below and whose lower end is supported by the upper surface of the donut type seat 7a. Although the material of the core 2 is not limited, it is preferably made of metal such as iron in view of handleability and economy. The outer diameter of the core 2 is the snorkel part 1
Determine according to the repair thickness of.

Reference numeral 3 is a two-division type nozzle which is composed of a front portion 3a and a rear portion 3b and is inserted into the core 2. The nozzle 3 has a curved front end 3a, so that the nozzle 3 is first inserted into the core 2 and then the snorkel part 1 is inserted.
It is directed between the inner peripheral surface of the core and the core 2. After that, the receiving metal 7b is attached to the inner diameter portion of the donut-shaped receiving seat 7a, and then the rear portion 3b of the nozzle 3 is inserted into the central hole 7b · H of the receiving metal 7b to insert the nozzle 3 into the nozzle 3.
Connect to the front part 3b of the. The lower end of the nozzle 3 is connected to a material pressure feeder via a material pressure hose 17 and a swivel device 18. In order to distribute the irregular refractory as repair material, the nozzle 3
Is rotatable by the turning device 18.

In the present invention, the space bar 4 is provided on the nozzle 3. Figure 1,
In FIG. 2, the space bar 4 has a nozzle 3 at the base end.
A plurality of shafts are mounted on the side surface of the vertical portion of the nozzle 3 symmetrically with respect to the axis of the nozzle 3. The number is preferably 2 to 4. In this embodiment, two space bars 4 are provided.

Reference numeral 5 is a cable for swingably operating the space bar 4. The tip is connected to the space bar 4, and the bottom is the core 2.
Extend below. As shown in the drawing, by passing the cable 5 through the U-shaped latches 6 and 16 provided above and below the nozzle 3, the space bar 4 becomes vertical when the cable 5 is pulled and becomes horizontal when returned.

The space bar 4 shown in FIG. 1 is reinforced by a support arm 9. The support arm 9 has a cylindrical holder 10 concentrically fitted to the space bar 4 at the upper end and the nozzle 3 at the lower end.
And, each is mounted. The tubular holder 10 is vertically movable with respect to the nozzle 3. 11 is a stopper for the tubular holder. Since the tubular holder 10 is vertically movable, the support arm 9 moves up and down together with the space bar 4.

By being reinforced by the support arm 9, when the nozzle centering device is inserted into the core 2, the space bar 4 does not deform and is accurately leveled even if some resistance due to contact with the core 2 is received. The nozzle 3 can be oriented in any direction, and the centering of the nozzle 3 can be made more reliable.

Further, the space bar 4 in the example of FIG. 2 is provided with a stopper 8 below the space bar 4 in order to easily keep it in the horizontal direction. The dotted line shows the state where the space bar 4 is directed upward.

3 (A) and (B) are enlarged perspective views of the U-shaped latches 6 and 16.

In the method of using the device configured as described above, in repairing the snorkel part 1, after inserting the core 2 into the snorkel part 1, the nozzle 3 is inserted into the core 2 with the space bar 4 facing upward. To do. Then the cable 5 is pulled and the space bar 4 is oriented horizontally. As a result, the space bar 4 serves as a guide, and the nozzle 3 naturally moves to the center of the core 2 and the centering of the nozzle 3 is completed.

When charging the repair material from the nozzle 3, the space bar 4
It may be folded by turning it upward, or may be left horizontally.

FIG. 2 shows another embodiment.

(Effect of the Invention) According to the present invention, the centering of the nozzle can be performed easily and accurately, and the following effects can be obtained.

It is possible to reliably put the repair material between the inner peripheral surface of the snorkel part and the core, and the material loss is small.

The nozzle can rotate smoothly without contacting the inner peripheral surface of the snorkel part or the core, and as a result, the amount of the repair material introduced becomes uniform in the circumferential direction.

Due to the above effects and, the time required for repair is shortened and the operating rate of the furnace is improved.

The nozzle centering work can be performed simply by pulling the cable extending below the core, which is effective in terms of safety.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of another embodiment of the present invention, and FIGS.
It is a partially expanded perspective view of a figure. 1 ... Snorkel part, 2 ... Core, 3 ... Nozzle, 4 ...
... Space bar, 5 ... Cable, 6 ... U-shaped latch, 7a
...... Donut type seat, 7b ・ ・ ・ seat, 8 …… stopper,
9 ... Support arm, 10 ... Cylindrical holder, 11 ... Stopper, 12 ... Vacuum degassing furnace, 13/14 ... Connector, 15 ...
… N ₂ gas pressure inlet, 16 …… stopper, 17 …… flexible porcelain, 18 …… turning device, 19 …… repair truck top plate.

Continuation of the front page (72) Takefumi Fujii, 1st Nishinosu, Oita-shi, Oita, Japan Oita Works, Nippon Steel Co., Ltd. (72) Yoshinobu Kambe 1-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Within the corporation

Claims (1)

[Scope of utility model registration request] 1. A cylindrical core inserted into a snorkel part of a vacuum degassing furnace after use is provided with a nozzle having a bent tip from below, and a nozzle is provided between the inner peripheral surface of the snorkel part and the core. In a repair device for a vacuum degassing furnace snorkel part in which repair material is introduced from the tip, a plurality of space bars axially mounted on the side surface of the vertical portion of the nozzle are provided symmetrically with respect to the axis of the nozzle, and the lower end Is connected to the space rod with a cable extending below the core, and a vacuum is provided, which is provided with a centering device for a core nozzle that allows the space rod to swing by pulling the cable. Degassing furnace snorkel repair equipment.