JPS6016392B2 - Repair material for plate bricks in sliding nozzle equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a sliding nozzle device used for pouring out molten metal. Regarding repair materials supplied by

[Prior art and its problems] For maintaining lubrication of the sliding surface of a sliding nozzle device, Japanese Patent Publication No. 44-111
As described in Publication No. 21 and Japanese Utility Model Publication No. 47-42523, etc., before setting the plate bricks, it is necessary to apply a lubricant to the sliding surface of the plate, or to create a recess in the sliding surface of the plate. A method of loading lubricant was used.

However, in such conventional methods, the lubricant is lost in a short time due to the heat generated when the molten metal flows out, which not only greatly reduces the degree of sliding lubrication, but also impregnates the plate bricks with tar, pitch, and other organic substances. Or, even if it is coated, the filled carbonized substance will disappear and the structure of the plate surface will become weaker.
There was a problem in that damage such as molten metal biting, scratching, and metal insertion occurred, resulting in a loss of damper performance. [Problems to be Solved by the Invention] This invention was completed in order to solve the problems of the above-mentioned subordinates. During subsequent operation or during downtime, open the sliding surface with the plate brick still in place or set in the metal frame of the device, and apply repair material to the damaged sliding plate sliding surface. The object of the present invention is to provide a repair material that can be supplied to a section and repair a damaged surface by the sliding of the sliding plate itself.

[Means for solving problems]

The present invention utilizes the filling function of metal silicon, that is, the scaling function by partial adhesion, in such a repair material.

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, aluminum nitrate, and others. Refractories such as aluminum compounds such as magnesium sulfate, other magnesium compounds, zirconium chloride, and other zirconium compounds can be optionally used.

In order to maintain the smoothness of the sliding surface and to shade damaged areas due to the swamp movement of the swamp plate, it is necessary to have a particle size of 50 microns or less. Graphite is added to this refractory aggregate in order to improve the corrosion resistance of the refractory itself and to provide the repair material with a lubricating function. The amount added is related to the amount of thermosetting resin added, which will be described later, but it is usually 5 to 3% by weight based on the total amount of the repair material. In order to improve the adhesion of the bone village to the damaged area, it is effective to use a thermosetting resin such as epoxy resin or phenol resin as a bonding material between the repair aggregate and the plate.

When the repair material according to the present invention is supplied to the damaged area,
In order to improve the adhesion between the aggregate particles in the repair material and the adhesion between the repair material and the plate material at the damaged site, using the heat possessed by the plate and the heat from the molten metal injected,
Metallic silicon powder is added as a compensating agent.

The amount added is preferably 4 to 4% by weight.
Further, in order to disperse the sliding surface, grease such as silicone grease or paraffin, which becomes liquid at the operating temperature and is in an ideal fluid state at the operating temperature of the sliding nozzle device, is added.

In addition, any exothermic agent or foaming agent such as aluminum, magnesium, titanium, or obsidian can be added to the repair material of the present invention, and it is possible to expect the effect of actively preventing insertion due to solidification of molten metal.

The repair material of the present invention may be used in the form of a paste, plate, cream, grease, semi-solid or solid.

Furthermore, when the fluid contains solids in the usage form, the solids content is preferably 70% or less (particularly preferably 5 to 65%), and when it is semi-solid, the solids content is preferably 50% or more. The accompanying drawings show an embodiment of a sliding nozzle plate suitable for externally dispensing the repair material of the present invention.

FIGS. 1 to 3 show vertical cross sections of each example, and FIGS. 4 to 6 show the state of the entrance on the sliding surface of the 9-hole hole in the repair material. In FIG. 1, reference numeral 1 denotes a sliding nozzle upper fixing plate which is connected and fixed to a nozzle 4 attached to the lower part of the tundish.

2 is a lower sliding plate connected and fixed to the lower nozzle 5.

The upper and lower plates 1 and 2 are provided with supply holes 10 for supplying liquid or grease-like waste material connected to a suitable pressure source. The tip of this supply hole 10 is closed in the vicinity of each of the grooves 4 and 5 in order to supply the damage repair material to the super-moving surface. Of course, it is also possible to fix the repair material supply hole 10 in the plate, provide a reservoir there, and supply the repair material from the reservoir to the sliding surface through the pores of the steel. be. Figures 4 to 6
The figure shows the arrangement of the tip entrance of the damage repair material supply hole 10 on the eyebrow surface.

4 and 5 show the case of a type in which the lower plate moves linearly with respect to the upper plate, and FIG. 6 shows the case of a type in which the lower plate moves rotationally with respect to the upper plate. As seen in each figure, a plurality of closing ends of the supply holes 10 are preferably provided in the middle of the sliding surface in order to uniformly supply the repair material over the entire sliding surface. In addition, not only in the middle direction of the sliding surface, but also in the sliding direction, especially in the front and rear of the nozzle, for example, on both the upper and lower plates of the area mainly formed by the sliding locus created when the nozzle part slides. A supply port for repair material may also be provided. Alternatively, as shown in FIGS. 4 and 5, it is desirable to adjust the supply state of the repair material to the sliding surface by making the upper plate's opening larger than that of the lower plate. On the other hand, in the case of a mixture of graphite and AI203-Si02 series refractory, or a solid repair material consisting of aluminum oxide, sodium nitrate, sodium silicofluoride, refractory brick shoulder, pitch, organic binder, binder clay, etc. It is also possible to use the means for continuous connection shown in FIG.

That is, a spring press-fitting device 8 is attached below the repair material supply opening provided on the lower plate and closed to the sliding surface, and the solid repair material 7 is filled thereon. The solid barrel material 7 is always actively slid and supplied onto the sliding surface by the action of the spring means. Further, instead of the spring press-fitting device 8, a screw cotter or a hydraulic mechanism may be used, or pressure may be applied by input. In addition, as shown in Fig. 3, a repair material is applied from the tip of the blow-off pipe guided from the shell onto the sliding plate 2, and it is applied to both plates through the notch 9 under the fixed side plate 1. A method of introducing it into a gap is also possible.

When the plate is in the closed state, the closed state, and the closed state, the repair material is applied to the sliding surface to fill the sliding surface with a film or a damaged part, and as a result, the next sliding surface When closed, this film and filling part act as a damage protection film, preventing direct penetration and contact with molten metal and reducing 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 upon the initial impact of the molten metal flow. A similar effect can also be obtained by actively rinsing away after each sliding movement. In addition, the repair material in the filled portion is applied to this area by the heating action, making it possible to completely repair the driving surface. Next, the damage protection film that is not formed when opening is formed when it is closed or due to the movement of the position due to sliding, and the formation of this damage protection film is repeated and performed continuously. Damage prevention is effectively achieved. 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.

〔Example〕

A solid reparation village was created by adding 4% by weight of phenolic resin to a mixed powder consisting of 40% by weight of alumina, 1% by weight of graphite, and 1% by weight of metal silicon powder, each having a particle size of up to 43 mm. Then, it was rubbed and supplied onto the sliding surface of the plate by the method shown in FIG.

In the conventional system, the swamping operation was not smooth after 8 charges, but it continued to operate smoothly without any problems even after 8 charges. [Effects of the Invention] The effects of the present invention are listed below.

By optionally adding additives depending on the purpose to this repair material, the sealing or connection effect of the sliding surface can be improved.

Since the repair material is integrated around the nozzle hole of the plate when necessary, 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 associated with this.

It is also possible to cool down the drinking surface by supplying repair materials.
Since the repair material is supplied from the outside, there is no need for coating the sliding surface of the plate with a sliding layer or applying lubricant during plate assembly, which improves the precision of the contact surface of the sliding surface and also improves the In addition, it is not necessary to make something with such high precision, and the life of the sliding plate can be extended.

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 pans, tundishes, converters, containers for storing molten metal, passages such as gutters, or opening/closing sliding parts and sliding parts for blowing fluid (including powder and granules) It has many effects, such as being able to be used for moving parts, etc., and has a wide range of applications.

[Brief explanation of drawings]

The accompanying drawings show an embodiment for supplying a sliding nozzle plate with a repair material according to the present invention, and FIGS.
FIG. 3 shows a vertical cross section of each embodiment, and FIGS. 4 to 6 show the state of the gate on the sliding surface of the repair material supply hole. 1...Top plate, 2...Bottom plate, 4
...Top nozzle, 5...Bottom nozzle, 3,
１０・・・・・・Supply hole for repair material. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A repair material for plate bricks that is supplied externally to the sliding surface of plate bricks in the operating state of a sliding nozzle device, which contains refractory particles of 50 microns or less, graphite, thermosetting resin, and metallic silicon. A repair material for plate bricks in a sliding nozzle device, characterized by containing powder.