JPS635667B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to hot water pouring ports and inlets such as tapping ports, tap holes, and sprues provided in kilns in converters and DH furnaces; The present invention relates to a repair device that can efficiently form a strong inner wall fireproof layer on a hot water outlet such as a suction pipe.

[Conventional technology]

The hot water outlet is exposed to erosion by molten metal and slag, abrasion, etc., and as time passes, the diameter of the outlet deviates from the designed value. For example, in the case of a tap of a converter, the inner wall of the tap is damaged by melting due to the molten steel being tapped, and the diameter gradually increases from the initial diameter. As a result, there were problems such as not only the tapping time being shorter than the set value, but also the molten steel scattering more and the slag mixing rate increasing.

Therefore, in order to tap the molten steel from the tap within a certain range of time, a repair material is placed on the tip of a spoon-shaped trowel and applied to the inner wall of the tap between each tap. Repairs were being made to reduce its diameter. Alternatively, tap the steel several times until the shortest possible tapping time is reached, then remove the remains of the eroded part of the refractory lining inside the tap hole, install a new sleeve-shaped tap hole brick, and then proceed to the next step. The gap between the sleeve brick and the inner wall is filled in and repaired by spraying or by adding tupper material (furnace repair material for injection). Additionally, a method of repairing the inner wall of the tap hole by spraying is also used in some cases.

[Problem that the invention seeks to solve]

However, in the above method, there is no appropriate means for aligning the axes of the trowel, perforator, repair pipe, etc. with the axis of the hot water outlet, and as a result, it is not possible to uniformly apply the refractory to the inner wall surface of the hot water outlet. Ta.

The present invention eliminates the drawbacks of these conventional techniques and provides a repair device that can easily and quickly align the axis of the repair pipe with the axis of the hot water outlet and form a uniform refractory layer with excellent smoothness. The purpose is to provide.

[Means for solving problems]

In order to achieve the object, the repair device of the present invention provides a reaction force base plate in contact with the outer periphery of the molten metal flow opening of the kiln, and also arranges a machine frame opposite to the molten metal flow opening. The apparatus is characterized in that the machine frame is provided with a drive mechanism for advancing and retracting the repair pipe into the hot water outlet of the kiln, and an alignment rod that penetrates the alignment hole formed in the reaction force base plate.

[Example] Hereinafter, the features of the present invention will be specifically explained using examples shown in the drawings.

FIG. 1 shows the overall structure of the repair device in this embodiment.

This repair device consists of a repair pipe C that moves forward and backward in the tapping port B of a converter A, a mechanism D that allows the repair pipe C to rotate and move forward and backward, an alignment mechanism E, a hanging device F, refractory materials, and oxygen gas. and a hydraulic oil supply device G.

Further, as shown in FIG. 2, the tap hole is made of a refractory material a, and deposits b such as bare metal and slag are attached to the inner wall of the tap hole. And the second
In the state shown in the figure, a repair pipe C of a repair device is inserted into this tapping port. FIG. 3 is a cross-sectional view of this repair pipe C.

The repair pipe C inserted into the tapping port B has a double pipe structure of a large pipe 1 and a small pipe 2.
An elliptical insert 3 is attached to the tip of this small pipe 2. Moreover, the space between the large pipe 1 and the small pipe 2 is a refractory material feeding path 4, and the tip thereof is a refractory material spout 4'. On the other hand, an oxygen gas supply path 5 is bored in the small pipe 2 . This oxygen gas supply path 5 opens into the tapping port B at an opening 6 via a communication path 5' bored inside the insert body 3, so that oxygen gas can be blown out. It's summery.

As shown in FIG.
It can move forward and backward in the axial direction. That is,
Guide tube 1 that guides the forward and backward movement of the repair pipe C
0' is supported by a cylinder support 8', and a traveling carriage 8 is driven by a hydraulic cylinder 9. At this time, a worm wheel 10 is provided around the large pipe 1, and this worm wheel 10 is connected to the worm 1 provided on the traveling truck 8 as shown in FIG.
It meshes with 1. This worm 11 is then rotated by a hydraulic motor 12.

Wheels 13 of the traveling truck 8 roll along guide rails 13' attached to the machine frame 7.

Furthermore, an aligning rod 14 is attached to the front end of the machine frame 7 on the furnace side, as shown in FIG. This alignment rod 14 is adapted to penetrate into an alignment hole 14' provided in a reaction force base plate 16 made of steel. A magnet coil 15 is arranged so as to be attracted to this steel reaction force base plate 16 when it is energized.

The entire machine frame 7, repair pipe C, etc. are supported by a hoist 17 via a spring 18. This spring 18 has the function of absorbing deformation, displacement, etc. of each part. And hoist 17
is capable of traveling along the I-shaped rail 19 by a traveling mechanism 19'.

A refractory material supply hose 20 and an oxygen gas supply hose 21 are connected to the repair pipe C, which is movable back and forth along the axial direction of the tapping port by such a mechanism. Further, a hydraulic hose 22 is connected to the hydraulic cylinder 9. Then, these refractory material supply hose 20 and oxygen gas supply hose 2
1 and hydraulic hose 22, refractory material, oxygen gas, and hydraulic pressure are sent from the feeding device G to the repair pipe C and the hydraulic cylinder 9, respectively.

In addition, in order to protect the feeder G, drive unit, etc. from the heat of the converter A, a heat shield plate 26 is installed in the middle of the machine frame 7.
has been erected. When the heat shield plate 26 is made movable, the applicability of the repair device is improved.

In this example, the traveling mechanism 19' moves the entire repair pipe C, machine frame 7, etc. along the I-shaped rail 19 in the direction of the tapping port B. Next, the height of the repair pipe C is adjusted using the hoist 17.
Furthermore, in order to penetrate the alignment rod 14 toward the alignment hole 14' of the reaction force base plate 16, the traveling mechanism 19' is moved again.
Activate. As the alignment rod 14 penetrates into the alignment hole 14', the overall height, horizontal direction, and inclination of the alignment rod 14, the repair pipe C, the machine frame 7, etc. are finely adjusted. At this time, these changes, deflections, etc. are absorbed by the elastic displacement of the spring 18.

When the magnet coil 15 is energized after the alignment rod 14 has completely penetrated the alignment hole 14', the machine frame 7 side of the magnet coil 15 is fixed to the furnace side by the generated magnetic force. It is attracted to the reaction force base plate 16, and the machine frame 7 becomes fixed. Due to this alignment, the repair pipe C assumes a position and orientation in which it accurately faces the tap hole B.

When the hydraulic cylinder 9 is then operated while maintaining this state, the traveling carriage 8 and the repair pipe C attached thereto move forward and backward along the axis of the tapping port B. Further, by operating the hydraulic motor 12, the repair pipe C can be rotated via the worm 11 and the worm wheel 10.

From this preparatory work, the repair work is performed by operating the hydraulic cylinder 9 to insert the repair pipe C into the tapping port B, and by operating the hydraulic motor 12 to rotate the repair pipe C.

And oxygen gas supply hose 21, small pipe 2
Oxygen gas is blown at high pressure from the opening 6 through the communication path 5' to cause a flame state on the inner circumferential wall of the tap hole B. Further, by rotating the repair pipe C, the oxygen gas is made to uniformly hit the inner circumferential wall surface of the tapping port B.

By operating the hydraulic cylinder 9, a repair pipe C is run inside the tap hole B, and the deposits b such as base metal and slag adhering to the inner peripheral wall of the tap hole B are melted by the flame, and then The deposits b such as melted metal and slag are blown away into the inside of the furnace A by high-pressure flame spraying. At this time, by moving the repair pipe C back and forth in the tap hole B several times as necessary,
It is possible to completely melt and blow away the deposits b such as metal and slag.

Next, after the deposits b such as metal and slag are melted and blown away, the refractory material inside the large pipe 1 is sent out from the feed path 4 and poured into the tap hole B through the opening 4'. . By retreating the repair pipe C during or after pouring, an elliptical shape with a smooth curvature protruding from the tip of the small pipe 2 and a height corresponding to the diameter of the tap hole B is formed. The insert 3 is pressed against the inner wall of the tap hole B, and the refractory applied thereon is uniformly adhered to the inner wall of the tap hole B.

This work can be done even while blowing out oxygen gas. By reciprocating the repair pipe C a required number of times as necessary, the uniform leveling work of the refractory can be completed. After the repair work is completed, operate the hydraulic cylinder 9 to remove the repair pipe C.
The repair work is completed by retreating the steel, removing it from the tapping port B, de-energizing the magnet coil 15, and activating the travel mechanism 19' to further move the steel back.

The oxygen gas used at this time is not high-pressure, but has enough energy to dissolve deposits such as metal and slag and eliminate their protrusions, and can be quite effective. can.

5 and 6 show another embodiment in which the tip of the repair pipe C is changed.

In the example shown in Figure 5, the refractory material feed pipe 1''
From there, the refractory material passes through the refractory material pouring port 4″, and the refractory material exits to the refractory material pouring port B.
applied to the inner walls of This refractory material is then held by the solid insert 3″ held by the holding part 23.
Pressed and smoothed.

In the example shown in FIG. 6, the tip of the small pipe 2 is widened in a trumped shape, and conical diffusion plates 24 are arranged at predetermined intervals within this widened portion. Note that the diffusion plate 24 is attached to the expanded portion with a support fitting 25. When using the repair pipe of this example, the fuel or oxidizing gas passes through the space between the diffusion plate 24 and the inner wall of the enlarged part of the small pipe 2 from the oxygen gas supply path 5, and forms a conical flow to flow through the hot water. Sprayed on the walls of the mouth. Therefore, there is no need to rotate the small pipe 2.

Examples of the fuel or oxidizing gas used include air, acelene, propane, heavy oil, etc. in addition to the oxygen gas described in the above embodiments. In addition, in the above example, we explained about repairing the tapping port of a converter.
Of course, the present invention is not limited to this.

〔Effect of the invention〕

As explained above, in the repair device of the present invention, by penetrating the alignment rod into the alignment hole provided in the reaction force base plate placed in contact with the hot water outlet,
The axis of the repair pipe can be aligned with the axis of the hot water outlet. Further, by setting in advance the relationship of the reaction force base plate to the hot water outlet and the relationship of the alignment rod to the repair pipe, the alignment work can be performed automatically. As described above, according to the present invention, it is possible to uniformly apply the refractory material to the inner wall of the hot water outlet, and repair work can be performed accurately.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the hot water outlet repair device according to the present invention, FIG. 2 is an enlarged sectional view of the repair pipe, FIG. FIG. 4 is a side view of the same, and FIGS. 5 and 6 are enlarged sectional views of the tip of another embodiment of the repair pipe. A: Converter, B: Steel tap, C: Repair pipe, 7:
Machine frame, 8: Traveling trolley, 9: Hydraulic cylinder, 1
4: Aligning rod, 14': Aligning hole, 16: Reaction force base plate.

Claims (1)

[Claims] 1. A reaction force base plate is provided in contact with the outer periphery of the hot water outlet of the kiln, and a machine frame is placed opposite to the hot water outlet, and a repair pipe is moved forward and backward into the hot water outlet of the kiln. A repair device for a hot water outlet, characterized in that a drive mechanism and an alignment rod that penetrates an alignment hole formed in the reaction force base plate are provided in the machine frame.