JPH06145737A - Method for repairing peripheral deteriorated part of blast furnace tap hole and form for repair - Google Patents

Abstract

PURPOSE:To eliminate the severe environment to human bodies in the repair operation of the peripheral part of a blast furnace tap hole. CONSTITUTION:The gripping part 5 of a form 3 is gripped by a manipulator 10 and after the form is set to the home position before the peripheral surface 2 of the tap hole from above, a pad part 6 on the rear surface of the form is pushed by a rod of a hole opener, by which the form 3 is pressed to the circumferential wall of the peripheral surface 2 of the tap hole; thereafter, a hose is gripped by the manipulator 10 and monolithic refractories are charged from an aperture 7 in the upper part. A vibrator is held by the same manipulator and is inserted from the aperture 7 into the form 3 where the monolithic refractories are compacted and vented. After the monolithic refractories solidify by a drying stage for a prescribed period of time, the form 3 is removed by the manipulator 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray repair apparatus for repairing a deteriorated portion around a taphole of a blast furnace.

[0002]

2. Description of the Related Art In general, casting bed equipment for extracting the molten slag that has fallen into the basin of a blast furnace from the taphole to the outside of the furnace includes a taphole, an opening machine for opening the taphole, a mud gun for closing, It is composed of gutters, etc., for pouring molten iron and slag. The tap hole is opened after a time when the melting inside the blast furnace is sufficiently advanced and a predetermined amount of tap metal is possible, and is closed after tapping the predetermined amount.

In the process of repeating the blockage of the opening,
Or, during the normal melting process in the blast furnace, cracks, rough surface, partial dropout of surface forming material, etc. on the taphole surface of the blast furnace due to large pressure fluctuations due to gas pressure rise around the taphole or blockage. Occurs, during the work of closing the tap hole, the filler leaks from between the tip surface of the tip of the mud gun cylinder and the tap surface. Further, since the mud gun is repeatedly crimped to the taphole surface, a large depression is formed at the taphole.

Conventionally, in such a case, the tap hole is disassembled by a rotary blade type chamfering device or a breaker, and a refractory for repair is manually applied to the same part, or a frame is formed in the same part and the refractory is poured and required. The blast furnace taphole is formed after a drying process for a long time.

[0005]

However, since the repair work of the deteriorated part of the taphole at the blast furnace is a work near the taphole, the human body is exposed to high heat and gas, which is dangerous and heavy labor. On the other hand, there is a blast furnace taphole frame forming method disclosed in JP-A-57-9809. This is because the mold is set at the tip of the mud gun, and it faces the front of the taphole to form a space between the wall surface around the taphole and the mold, and the fluid amorphous refractory is poured into this space. Although it is a method of solidifying afterwards, this drawback is that (1) there is a work of pouring a fluid refractory into the mold, and (2) it is necessary to set a mold that covers the peripheral wall surface, The heavy labor involved in this work will not disappear.

An object of the present invention is to eliminate the above-mentioned drawbacks, eliminate a harsh environment for the human body, and more easily repair the deteriorated part of the blast furnace tap hole, thereby repairing the deteriorated part around the blast furnace tap hole. And to provide repair formwork.

[0007]

In order to achieve the above object, a method for repairing a deteriorated portion around a taphole of a blast furnace according to the present invention is a mold of a predetermined shape having a size for covering the peripheral surface of the taphole with a dedicated manipulator. After setting the frame at a fixed position in front of the tap hole, press the form frame against the wall around the tap hole peripheral surface with the forward / backward drive of the rod of the opening machine, and then remove the irregular refractory The charging is carried out from the upper part (Claim 1). In the present method, it is preferable that after inserting the amorphous refractory material, a vibrator is inserted by a manipulator to perform consolidation and degassing of the amorphous refractory material.

Further, in the repairing mold of the present invention, the front side is opened as an opening covering the peripheral surface of the taphole, the hanging grip portion by the manipulator hand is provided at the upper rear corner, and the rod of the perforator is provided at the rear surface. The pad portion having a wedge-shaped cross section which is pressed by the upper wall has an opening portion for inserting a hose or the like (claim 2).

[0009]

In the repair method according to the first aspect of the present invention, the mold is set at a fixed position before the tap hole by a dedicated manipulator. As an alternative method, it is possible to use a mud gun and fix the formwork in advance and carry it to the front of the taphole.However, since the mudgun and the upper end of the gutter are close to each other, carry a large formwork handled by the present invention. I can't. In this method, the manipulator handles the formwork so that it can be loaded and unloaded.

Further, in the present method, after the mold is pressed against the wall around the peripheral surface of the taphole by the forward / backward drive device of the rod of the hole punching machine, the amorphous refractory is loaded from the upper part. . Even in this process, it is possible to use a mud gun to push the mold with a matte gun, but when using the mud gun, the pushing force may deform the mold, and the stroke is curved, so fine adjustment Therefore, it is necessary to confirm the position in front of the hot metal tap. In this method, since the mold is pressed by using an opening machine having a linear stroke and a smaller force than that of the mud gun, there is no fear of applying an excessive pressing force to the mold and the position adjustment is easy.

From the above two points, according to the repairing method of the present invention, without being exposed to high heat or gas in front of the tap hole of the blast furnace,
It can be repaired from a remote location in a better environment.
Therefore, the operator is freed from high heat, heavy muscles, and dangerous work, which contributes to work comfort and labor saving.

Since the repairing mold of the second aspect has the hanging part for holding by the manipulator hand at the upper rear corner, the mold can be set and removed by the manipulator hand. Further, since the wedge-shaped pad portion for pushing the rod of the punching machine is provided on the back surface, the pressing force can be applied at an appropriate angle even by the linear stroke motion of the rod in the punching machine. Moreover, a hose or the like can be inserted through the opening portion of the upper wall.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. In FIG. 1, 2 is a peripheral surface of an end portion of the taphole 1 that has been disassembled and exposed before repairing, and 3 is a box set by a hand 11 of a manipulator 10 in front of the taphole peripheral surface 2. The formwork of a shape is shown. The mold 3 is opened as a front opening facing the taphole peripheral surface 2 as an opening 4 having a sufficient width to cover the taphole peripheral surface 2, and can be grasped by a manipulator hand 11 at an upper rear corner. It has a hanging grip 5. Further, on the back surface of the mold 3, a pad portion 6 having a thin wedge-shaped cross section is provided on the upper side in order to equalize the pressing force when pressing with the rod 22 (FIG. 4) of the hole punching machine 20. Further, the upper wall of the mold 3 is provided with an opening 7 for inserting the hose 30 (FIG. 2) and the vibrator 40 (FIG. 3).

The manipulator 10 is a blast furnace tap 1
It is mounted on the trolley 13 above the tuyere inspection deck 12, and the manipulator hand 11 is inserted and lowered from the working opening 14 provided in the tuyere inspection deck 12 to move the formwork 3 of FIG. As described above, it can be set from above the taphole 1. Reference numeral 15 is an opening lid, and a chain 16 and an opening / closing drive shaft 17 are driven by an opening / closing motor not shown.
Be opened through.

Next, a repairing method using the mold 3 will be described. (1) Grasp the hanging gripping portion 5 with the hand 11 of the manipulator 10 and set the formwork 3 at a predetermined position in front of the disassembled taphole peripheral surface 2 prior to repair (FIG. 1). That is, the opening lid 15 of the tuyere inspection deck 12 is opened, the manipulator hand 11 is inserted and lowered from the opening 14, and the form 3 is set as shown in FIG.

(2) As shown in FIG. 4, using the hole making machine 20, the feeder 21 which is the rod forward and backward drive device is moved forward,
By pressing the tip 23 of the rod 22 against the pad portion 6 of the mold 3, the mold 3 is pressed against the wall 8 around the taphole peripheral surface 2 (FIG. 2). Since the pad portion 6 is thin on the upper side, the deviation in the direction of the linear stroke of the rod 22 is alleviated and an appropriate average pressing force is applied to the mold 3. Further, since the pressing force by the hole punching machine 20 is obtained, there is no fear of deforming the mold or necessity of fine adjustment after the deformation.

(3) Form the manipulator hand 11 into the form 3
, The grip portion 31 of the hose 30 for charging the irregular refractory is grasped, the tip of the hose is inserted into the upper portion of the form 3, and the irregular refractory 32 is attached to the form 3 and the taphole peripheral surface. It is made to flow into the space between the two (Fig. 2). During this time, the pressing by the punch 20 is maintained.

(4) After returning the hose 30 to a predetermined position with the manipulator hand 11, hold the vibrator 40 with the manipulator hand 11 and insert the vibrating portion 41 into the mold 3 through the opening 7. Then, the amorphous refractory 32 is consolidated and degassed (FIG. 3). During this time, the pressing by the hole punching machine 20 is maintained. The vibrator 40 is gripped by the gripping part 42 provided above the vibrating part 41.

(5) After the vibrator process, a drying process is performed for a predetermined time to solidify the mold, and then the manipulator hand 11 holds the mold 3 to remove the mold 3. After the drying process for the required time, it is solidified to form the repaired blast furnace taphole area.

The vibrator process in the above embodiment can be omitted depending on the circumstances.

[0021]

As described above, according to the present invention, the following excellent effects can be obtained. 1) According to the repair method of the first aspect, since the mold can be carried in from the upper part of the taphole by the manipulator, it is possible to set a large mold. Further, since the back surface of the mold is pushed by the feeder of the hole punching machine, there is no fear of applying an excessive pressing force to the mold, and the position adjustment is easy. This means that workers can be freed from high heat, heavy muscles and dangerous work exposed to high heat and gas in front of the blast furnace tap such as formwork setting and refractory distribution, and repair from a better location in a remote environment. Means Therefore, it largely contributes to making the repair work comfortable and labor saving.

2) According to the repairing formwork of claim 2,
Suspended gripping by a manipulator, proper pressing by a hole opening machine, hose insertion, etc. can be performed, and a mold suitable for carrying out the method according to claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a process of setting a mold according to an embodiment of the present invention.

FIG. 2 is a diagram showing a process of pressing a mold and a process of pouring an indefinite refractory material in one embodiment of the present invention.

FIG. 3 is a diagram showing a vibrator process in one embodiment of the present invention.

FIG. 4 is a diagram showing a pressing process of a mold according to an embodiment of the present invention.

[Explanation of symbols]

 1 Blast furnace taphole 2 Edge peripheral surface 3 Formwork 4 Opening 5 Suspended gripping part 6 Pad part 7 Opening part 8 Wall around the taphole peripheral surface 10 Manipulator 11 Manipulator hand 12 Tuyere inspection deck 13 Trolley 14 Working opening 15 Opening lid 16 Chain 17 Opening / closing drive shaft 20 Opening machine 21 Feeder 22 Rod 23 Rod tip 30 Hose 31 Gripping portion 32 Irregular refractory 40 Vibrator 41 Vibrating portion 42 Gripping portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuhiko Kondo 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock of Kimitsu Steel Co., Ltd.

Claims (2)

[Claims] 1. A manipulator is used to set a mold having a predetermined shape that covers the peripheral surface of the taphole at a fixed position in front of the taphole, and is then moved by a rod forward / backward drive device of the punching machine. A method for repairing a deteriorated area around a taphole of a blast furnace, which comprises pressing an unshaped refractory material from above after pressing against the wall around the taphole peripheral surface. 2. A pad portion having a wedge-shaped cross section, the front side of which is opened as an opening covering a peripheral surface of a taphole, a hanging grip portion by a manipulator hand is provided at an upper rear corner, and a rod of a perforator is pressed at a back surface thereof. A repair formwork characterized in that the upper wall has an opening for inserting a hose or the like.