JPH0627641Y2 - Formwork for repairing tubular body of vacuum degasser tank bottom - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a repairing mold made of an indefinite refractory which can be suitably used for repairing a reflux pipe of a vacuum degassing apparatus.

[Conventional technology]

As a vacuum degassing device, a reflux pipe that is used by being immersed in molten steel in a container is formed as an integral suction pipe, and a DH type that repeatedly guides molten steel in the container into the degassing container, and a reflux pipe is a suction pipe and a discharge pipe. RH type is widely known, which is formed from two of the above, and which continuously sucks and discharges molten steel.

To repair the refractory layer of this reflux pipe, see
By spraying as described in Japanese Patent No. 5123, Jitsuko Sho 53
-47046, in which a refractory material is press-fitted using a disposable circular tube, and further, as described in JP-B-51-1202, the refractory material is poured into the gap between the molds, and after curing, It is common to pull out the formwork for repair.

[Problems to be solved by the device]

However, in the case of spraying the above-mentioned conventional repair material, although the work itself is simple, the strength of the adhered refractory material is weak and peeling and wear due to the molten steel flow are severe, so that it must be repaired frequently. In the case of press-fit repair,
There is a problem with the fluidity of the press-fitting material, and if it is made a little soft to facilitate press-fitting, it will leak from the opening of the form, and if it is hard, it will take time at the time of press-fitting and it will not be possible to uniformly fill the repair material. In addition, since the repair frame for filling the repair material is consumed while being attached, a considerable number of repair frames must be prepared.

In addition, in the case of refractory distribution, it is not necessary to prepare many molds for permanent use, but after the refractory is hardened, when the mold is pulled out, the refractory may stick to the outer periphery of the mold. However, this may cause a defective portion on the construction surface. In particular, the occurrence of this defective portion is a problem that appears significantly during repair at high temperatures.

In the present invention, the problem to be solved is to prevent the exfoliation due to the adherence of the refractory material to the mold when removing the mold after the repair in the flow-in repair of the worn refractory layer of the reflux pipe, The object is to obtain a formwork structure for forming a repair body with a good surface condition, which can be easily and reliably attached to and removed from a part.

[Means for Solving the Problems]

The irregular form refractory repair formwork of the present invention is a refractory formwork having a double wall structure with a space part for cooling water as a cooling water passage and a spout that penetrates through the head part of the formwork. An outlet pipe, a cooling water inlet at the base end of the formwork, and a refractory supply part of the refractory supply pipe are provided, and the formwork is tapered toward the head. A taper is provided, and further, a flange having a structure for moving or detaching is fitted to the base end of the mold.

[Action]

In the present invention, the formwork has a double structure, and cooling water is passed through the space formed by the formwork to prevent seizure of the refractory during hot repair and shrinkage demolding by cooling the formwork. Further, the flange fitted with a structure that can be moved or detached from the mold facilitates the demolding work by preventing the refractory from peeling off when the mold is pulled out and by the taper of the mold.

〔Example〕

FIG. 1 is a sectional view showing the overall structure of the repair form of the present invention.

In the figure, the formwork of the present invention shown as 1 is a double-walled headed cylindrical mold having an outer wall member 3 and an inner wall member 4 which form a casting material formwork whose base ends are attached to a bottom plate 2, respectively. It has a frame. The space 9 between the double walls forms a cooling water passage having a cooling water reservoir 6 in the head, and the water injection port 51 of the cooling water injection pipe 5 and the head are formed in the base end of the double wall structure. Drainage pipe 8 from the drainage intake 7 provided in the cooling water pool 6 formed in the section
Is attached.

Further, 10 has a refractory feed part 17 connected to a supply source of an external pouring material (not shown) at the base end of the mold 1,
Formwork chamber 16 formed by the bottom plate 2 and the inner wall member 4
The refractory pouring pipe | tube is arrange | positioned inside, the outer wall member 3 of the form 1 forms the inclined surface which becomes thin toward the front, and the pouring material pouring outlet 11 is provided in the front-end | tip. A top plate 12 for changing the flow of the pouring material is attached to the spout 11. Reference numeral 13 denotes a heat insulating material that softens the thermal deformation of the top plate 12.

In addition, the cooling water injection port 51, the refractory supply part 17 of the refractory extraction pipe 10, the base end portion at the disposition position of the discharge pipe, and the like are the bottom surface side of the mold or the peripheral surface. Flange movement,
Including those at a height that does not hinder attachment and detachment.

Numeral 14 stands so as to surround the mold 1 on the bottom plate 2 in order to act as a cushioning function when the whole mold 1 is attached to a reflux pipe or the like to be repaired, and to prevent separation of refractory material at the time of demolding. An elastic body is shown. Further, reference numeral 15 denotes a moving flange for mounting the sealing material, which is attached to the upper surface of the elastic body 14.

FIG. 2 shows a mode of use of the mold of the present invention.

Referring to the figure, the mold 1 mounted on a frame (not shown) is inserted into the reflux pipe A whose inner wall is to be repaired. Then
The sealing material C is put in the moving flange 15 and raised so as to be pressed against the tip of the reflux pipe A, and the repulsive force of the elastic body 14 is positioned and fixed within the range and fixed. If the reflux pipe A still has heat, it is inserted into the reflux pipe A in a state where water is filled in the reservoir portion 6, and the pouring material M is started to be poured from the spout 11 of the refractory injection pipe 10, and at the same time, the work to be performed is started. Water supply from the water injection pipe 5 is also started according to the temperature of the body, and the mold 1 is cooled to prevent the pouring material M from seizing. After the filling is completed, the mold 1 is lowered until the elastic material 14 is fully stretched, either waiting until it is cured as it is or observing the curing of the pouring material M. Since the mold 1 is cooled, it can be easily demolded from the casting material M, and the moving flange 15 remains the recirculation pipe A.
Abut the bottom of the. Further raise the formwork 1 again,
Fix in place and cure further. In any case,
If the supply of cooling water is increased after the curing is surely performed, and the mold is cooled and shrunk to remove the frame, a clean inner wall of the reflux pipe can be formed without damaging the construction body. Further, the moving flange supported by the elastic body can maintain the state in which the seal material C is in contact with the tip of the reflux pipe A within the extension range of the elastic body even when the mold is lowered, and the pouring material M is prevented from flowing out. The prevention function can be demonstrated.

In addition, a cylinder or the like may be used to support the moving flange instead of an elastic body, a plate-shaped sealing material may be placed inside the flange and left after construction, or the flange itself may be fixed to the reflux pipe and left as it is. Any structure that can be used, such as removing after removing the mold from the mold, may be used. In the figure, P is a gas hole forming wire.

After the work is completed, the cooling water may be completely drained from a drain hole (not shown) provided at the base end of the outer wall member.

[Effect of device]

In the present invention, since the formwork itself has a cooling structure,
There is no seizure of refractory material due to hot repair, the mold can be shrunk and demolded by the strong cooling part, the flange combined with the elastic body and other support can prevent the outflow of refractory material, and the die taper By having a structure such as putting it on the frame,
The demolding can be performed completely, a clean surface can be obtained, and the construction time can be significantly shortened.

[Brief description of drawings]

FIG. 1 is a view showing the overall structure of the mold of the present invention, and FIG. 2 is a view showing a usage mode of the mold of the present invention. 1: Formwork, 2: Bottom plate 3: Outer wall member, 4: Inner wall member 5: Water injection pipe, 6: Cooling water reservoir part 7: Drainage inlet, 8: Drain pipe 9: Space (cooling water passage), 10: Fireproof Material outlet pipe 11: outlet, 12: top plate 13: heat insulating material, 14: elastic body, 15: moving flange, 16: inner chamber of formwork, 17: refractory inlet, 51: water inlet

Claims (3)

[Scope of utility model registration request] 1. A headed cylindrical mold for forming a cooling water passage in a space of a double wall structure, a refractory spout pipe having a spout provided through the head of the mold, and the mold. A form for repairing a tubular body at the bottom of a vacuum degassing device with an irregular shaped refractory, which has a refrigerant inlet for cooling water and a refractory inlet for the refractory outlet pipe at the base end. 2. A vacuum degassing apparatus tank bottom tubular body according to claim 1, wherein a utility model registration in which a tapered draft taper is provided toward the head of a double-walled headed cylindrical formwork. Formwork for repair. 3. A vacuum degassing apparatus tank according to claim 1, wherein a utility model registration in which a flange having a structure for moving or detaching is fitted to a base end of a double-walled headed cylindrical formwork. Formwork for repairing the bottom tubular body.