JPS5850947B2 - Repair method for plate surface in sliding nozzle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing a damaged portion of a sliding surface near a nozzle hole in a sliding nozzle device using an externally supplied material.

Previously, Tokuko Publication No. 11121/1972, Publication No. 47/47
As described in Publication No. 2523, in sliding nozzle devices, etc., before setting the plate bricks, a lubricant is applied to the sliding surface, or a recess is formed in the sliding surface of the plate and the lubricant is loaded therein. However, in the conventional method, the lubricant is burnt out in a short time due to the heat generated when the molten metal flows out, which not only greatly reduces the sliding lubricity but also damages the plate or brick surface. Impregnating or applying tar, pitch, or other organic matter to the pores in the pores will also cause the filled carbon material to disappear and weaken the structure of the plate surface.
There is a problem in that damage such as molten metal getting caught, scratching, or metal insertion occurs between the nozzle holes above and below the sliding surface, resulting in a loss of damper performance.

This invention was completed in order to solve the above-mentioned conventional problems, and damage is most likely to occur between the nozzle holes above and below the sliding surface, during operation after assembly of the sliding nozzle device, or during operation of the sliding nozzle device after assembly. An object of the present invention is to provide a method of repairing a damaged surface by the sliding of the sliding plate itself by supplying a repairing material for the damaged portion to the sliding surface of the sliding plate during the downtime.

Aggregates for the repair material of the present invention include: - Oxide-based refractories such as mullite, quartz, alumina, and magnesia - Aluminum chlorohydrate, aluminum oxyhydroxide, aluminum chloride, aluminum hydroxide, aluminum sulfate, and aluminum nitrate , other aluminum compounds/magnesium sulfate, other magnesium compounds/zirconium chloride, other zirconium compounds, and other refractories with graphite added thereto can optionally be used.

In order to maintain the smoothness of the sliding surface and slide into damaged areas by sliding the sliding plate, it is necessary to have a particle size of 50 microns or less.

Further, for dispersion on the sliding surface, at least pitch, tar, grease such as silicone grease, paraffin, etc. are added as a dispersant that becomes liquid at the operating temperature.

Furthermore, in order to improve the adhesion of the aggregate to the damaged area, it is necessary to use a thermosetting resin such as epoxy resin or phenol resin as a bonding material for the repair aggregate and the plate. .

Any exothermic or foaming agent such as silicon, aluminum, magnesium, titanium, obsidian, etc. can be added to the repair material used in the present invention, and it can be expected to have the effect of actively preventing insertion due to solidification of molten metal. .

The repair material used in the present invention is used in the form of a solid plate or rod.

Then, it becomes fluidized at the operating temperature and is in a state where it is easy to bond with the damaged part at that temperature.
is necessary.

For this purpose, it is essential to add tar, pitch, grease, or paraffin, and a thermosetting resin to the graphite-containing refractory aggregate powder of 50 microns or less.

The present invention aims to extend the life of the plate by effectively supplying such a repair material to locally damaged areas and repairing them.

The accompanying drawings illustrate preferred embodiments for carrying out the invention.

In the figure, 1 is a fixed side plate, 2 is a sliding side plate, T is a solid repair material molded by adding pitch and thermosetting resin to a mixture of graphite and A1203-8102 series refractory, 4 5 is an upper nozzle hole for discharging molten metal, and 5 is a lower nozzle hole.

Then, the repair material 7 molded into the vertical through hole 3 that opens to the sliding surface from the outside is inserted into the sliding side plate that is the supply port for the repair material, and the repair material 7 is slid by the action of the spring means of the pressing spring press-fitting device 8. The repair material 7 is actively rubbed and supplied onto the moving surface.

1. When the plate is in the closed state, open state, or sliding state. The repair material is supplied to the sliding surface to fill the sliding surface with a film or the damaged part.As a result, when the next opening is closed, this film and the filled part become a damage prevention film and melt. It prevents direct penetration and contact with metal and also reduces the penetration speed.

These damage protection membranes may be washed away by the molten metal flow, but they protect the membrane until it is washed away, and cushion the shock of the initial impact of the molten metal flow.

A similar effect can also be obtained by actively rinsing away after each sliding movement.

Furthermore, the repair material in the filled portion is baked into this area by the heating action, making it possible to completely repair the sliding surface.

Next, the damage prevention membrane that is not formed when opening is formed when closing or due to the movement of the position due to sliding,
This action of forming the damage-preventing film is repeated and performed continuously, and the damage is effectively prevented.

Appropriate repair materials are selected and operated depending on operating conditions, firebrick material and other conditions, and damage behavior.

Further, even if the repair material disappears due to the first opening/closing operation, for example, new repair material is supplied as described above, so that the lubricating effect can be maintained.

As mentioned above, repair materials are used not only in the above example but also in accordance with the damage situation.

In addition, multiple effects can be achieved, such as using damage prevention methods that have a lubricating effect.

Instead of the spring device 8 shown in the figure, it is also possible to use a screw, a screwdriver, a hydraulic pressure means, etc.
Furthermore, depending on the condition of the sliding nozzle hole, it is of course possible to use supply from above as well.

In addition to the effects described above, the present invention can also achieve the following effects.

By adding optional additives to the repair material according to the purpose, the sealing or connecting effect of the sliding surface can be improved.

Furthermore, if the repair material is constantly supplied around the nozzle hole of the plate, it is possible to prevent leakage of metal or hot water due to a drop in surface pressure, and furthermore, failure of the device due to inability to close the nozzle hole.

It also prevents gas leakage caused by gas blowing to prevent solidification of molten metal or degas it, and also prevents damage to the plate due to the bubbling effect that accompanies this.

Cooling of the sliding surface can also be achieved by supplying repair material.

Since the repair material is supplied from the outside, there is no need to cover the sliding surface of the plate S with a sliding layer or apply lubricant during plate assembly. In addition, there is no need to make something with such high precision, which extends the life of the sliding plate.

By containing a heating agent or a bubbling agent in the repair material, the molten metal in the nozzle hole is heated or bubbled to prevent the molten metal from solidifying.

In addition, sliding opening/closing devices for passages such as pans, tundishes, and converters as well as containers and gutters that contain molten metal, or opening/closing sliding parts and sliding connecting parts for blowing fluid (including powder and granules). It has many effects such as a wide range of uses.

[Brief explanation of the drawing]

The accompanying drawings illustrate preferred embodiments of the repair method according to the present invention. 1... Upper plate, 2... Lower plate, 3... Repair material supply hole, 4... Upper nozzle, 5... Lower nozzle, 7... Molded repair material, 8... Spring device.

Claims (1)

[Claims] 1. Refractory particles of 50 microns or less consisting of one or more of oxides, carbides, and nitrides are made to contain graphite and one or two of thermosetting resins, tar, pitch, grease, and paraffin, and then molded. 1. A method for repairing a plate surface in a sliding nozzle device, characterized by sliding a repair material from the outside onto a damaged surface through a hole communicating with the sliding surface.