JPS5937708B2 - Continuous casting machine draining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a complete rotary continuous casting machine using a belt and a casting wheel, and more particularly to a draining device for a continuous casting machine that completely removes moisture adhering to the belt and casting wheel.

A belt stretched by multiple belt guide rollers is pressed against the casting wheel, molten metal is injected into the casting space formed by the casting wheel and the belt, and the casting wheel is rotated to continuously cast slabs. In the rotary complete continuous casting machine that is produced, completely removing moisture adhering to the belt and casting wheels is an important issue necessary to ensure stable operation and high quality slabs, and this is an essential issue. If the residual moisture is completely removed, the moment it comes into contact with the molten metal, rapid vaporization and volumetric expansion will occur, causing problems such as splashing and uneven production of solidified grains.

For this reason, various types of draining devices have been used in continuous casting machines, but all of them are insufficient.

For example, the first method involves blowing air onto the object to be dried, which consists of a belt and a casting wheel, to scatter water droplets, and then blowing the combustion flame of a gas burner directly onto the object to remove the remaining moisture. be.

In this method, each flow section may be extremely short,
In order to enhance the water evaporation effect, the flame temperature is increased to over 100℃,
At the same time, the temperature of the object to be dried is raised to maintain the moisture evaporation effect even after passing through the flame.

For this reason, steel belts with low thermal conductivity are locally heated and reach high temperatures close to red-hot, resulting in a decrease in hardness, a decrease in material strength, and the effects of repeated thermal fatigue, causing cracks to occur at an extremely early stage, resulting in a shortened service life. (several hours).

Therefore, for non-ferrous metals, which have a relatively low production volume, it will not have a big impact, but the first draining method cannot be used in continuous casting machines for steel that require mass production. Can not.

The second method of draining is to bring a moisture-absorbing member such as felt or cloth into contact with the object to be dried to absorb moisture, and then drying this moisture-absorbing member with high-temperature air or the like.

Although it is possible to remove water from the sludge using this second method, it is difficult to remove the water evenly due to mechanical contact, and a water film of several microns tends to remain.

As described above, the conventional draining methods are not practical enough, and there is a strong demand for a draining device that can completely remove moisture without adversely affecting the dried object.

The present invention was made in order to eliminate the drawbacks of the conventional water draining method, and an object of the present invention is to provide a draining device for a continuous casting machine that can completely remove moisture without adversely affecting the object to be dried. There is.

The present invention presses a belt stretched by a plurality of belt guide rollers against a casting wheel, injects molten metal into a casting space formed by the casting wheel and belt, and rotates the casting wheel to produce a cast piece. In the draining device of a continuous casting machine that continuously produces , a plush roller and a moisture absorbing material are arranged in the first step of the draining process, followed by a hot air draining device in the second step. .

In the present invention, in addition to the plush roller and moisture absorbent material used as the conventional draining bag R, a warm air draining device is provided, so that it is possible to completely remove the water film remaining on the surfaces of the belt and the casting wheel.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in the outline in FIG. 1, the rotary continuous casting machine presses a belt 14 stretched through a plurality of belt guide rollers 10 and tension ports 12 to a casting wheel 16, and casts the caster. Molten metal 20 is poured into a casting space (mold) 18 formed by ring 16 and belt 14.

Although not shown, the molten metal 20 is once poured from a ladle into a tamp push 22, and then is injected into the mold 18 through a nozzle 24 at the bottom of the tamp push 22.

The molten metal 20 injected into the mold 18 is cooled by the belt 14 and the casting wheel 16, and moved together with both in the direction of the arrow, and simultaneously pulled out by the pinch rollers 26 to form a slab 28.
is drawn out continuously.

The back surface of the belt 14 forming one side of the mold 18 in contact with the slab 28 is subjected to severe cooling by the cooling guide 30.

The cooling guide 30 is constantly urged toward the belt 14 by a spring 32.

Cooling water W is supplied to the cooling guide 30, and the cooling guide 3
Cooling water is squirted into the gap between belt 1 and belt 1
Cool 4.

Further, although not shown, a groove through which cooling water can pass is also formed inside the casting ring 16, thereby performing internal water-flow type cooling.

The slab 28 that has come out of the mold 18 is re-bent by a straightening knife 34 and a straightening roller 36, and at the same time a plurality of spray nozzles 38 and straightening knives 34 arranged around the slab 28 are bent.
Cooling water is jetted directly onto the slab 28 to accelerate cooling.

In the rotary complete continuous casting machine constructed as described above, belt cooling water and spray cooling water adhere to the belt and are continuously conveyed as water droplets a as the belt 14 moves.

If it continues to rotate with such water droplets attached, it will naturally react with the injected molten metal and cause trouble, which is extremely dangerous.

In the embodiment according to the invention, the belt 14 is drained in two stages.

That is, in the first stage, most of the water droplets are forcibly dropped to the bottom by a high speed rotating plush roller 40 made of a flexible material such as synthetic resin.

Next, a moisture absorbing material 42 made of sponge, cloth, etc. is brought into direct contact with the belt 14 to absorb most of the moisture.

Some water film and water droplets C still remain on the belt 14.

In the embodiment according to the present invention, a hot air outlet device 44 is provided over the section L1 of the belt 14 as the second stage of draining, and a hot air distribution plate 46 provided inside the hot air outlet device 44 distributes hot air over the section L1. It is made to flow uniformly onto the surface of the belt 14.

The hot air flowing out significantly reduces the partial pressure of water vapor on the surface of the water film, promoting vaporization, and completes the evaporation in a short time.Moreover, the water film C completes vaporization because the heat is transferred to the belt 14 only through the water film C. Until this occurs, the temperature of the belt 14 itself hardly increases, and the belt 14 is not affected by thermal fatigue at all.

Next, draining of the casting wheel will be explained.

The water droplets d adhering to the surface of the casting wheel 16 are scattered as water droplets e by the first-stage plush roller 48, and then the moisture absorbing material 50 is brought into contact with the casting wheel 16 to remove most of the water. 16 remains as a water film f.

In the second stage of draining, the area L2 is
The remaining water film f is evaporated and dried as in the case of the belt 14 by blowing out hot air over a period of time.

FIG. 2 shows a hot air distribution route, in which a conduit 5a is connected to a hot air generator 54 that includes an electric heater and a blower, and this conduit 56 is branched to form a hot air outflow device 44.
, 52 to supply hot air to the outflow device 44.52.

FIG. 3 shows the relationship between the temperature and pressure of hot air.

It is desirable that the pressure of the hot air is equal to atmospheric pressure and the temperature is 100° C. or higher; however, in practice, since the hot air is in a fluid state, a temperature of 70° C. or higher will provide a sufficient draining effect.

In addition, considering the influence on the material, it is desirable that the upper limit of the temperature of the hot air be maintained at 200° C. or lower, which is the softening temperature of commonly used steel cast wheels.

In FIG. 3, the range indicated by the symbol T is the operating temperature range, and the dashed line indicated by ■ is the lower limit of the pressure for obtaining practical effects.

According to the embodiment described above, most of the water droplets deposited on the belt 14 and the casting wheel 16 are first removed by the plush rollers 40, 48 and the moisture absorbing material 42, 50, and the remaining water film is further removed by hot air. It will be completely removed by the outflow device 44.52.

As explained above, according to the water draining device for a continuous casting machine according to the present invention, since a warm air outflow device is provided in addition to the plush roller and the moisture absorbing material, it is possible to completely remove moisture from the belt and the casting wheel. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an embodiment according to the present invention, and FIG.
The figure is an explanatory diagram showing the hot air outflow route used in the embodiment according to the present invention, and FIG. 3 is an explanatory diagram showing the operating temperature and operating pressure of the hot air used in the embodiment according to the present invention. 10...Belt guide roller, 14...
・Belt, 16... Casting wheel, 18...
Casting space, 20... Molten metal, 28...
・Slab, 40...Plush roller, 42...
... Moisture absorbing material, 44 ... Hot air outflow device, 48
...Plush roller, 50 ... Moisture absorbing material, 52 ... Hot air outflow device.

Claims (1)

[Claims] 1. A belt stretched by a plurality of belt guide rollers is pressed against a casting wheel, molten metal is injected into a casting space formed by the casting wheel and the belt, and the casting wheel is rotated. In the draining device of a continuous casting machine that continuously produces slabs, a plush roller and a moisture absorbing material are placed in the first step of the draining process, and a hot air outflow device is placed in the second step. Features a draining device for continuous casting machines. 2. The draining device for a continuous casting machine according to claim 1, wherein the hot air outflow device includes a hot air distribution device that distributes and causes hot air to flow out.