JPH0354024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a molten metal supply device for continuously casting thin metal slabs using a twin-belt continuous casting machine.

(Conventional technology) In recent years, twin belt continuous casting machines have been increasingly used for casting non-ferrous metal sheets such as copper, lead, zinc, and aluminum, as they can produce wide thin sheets from molten metal with high efficiency. I'm getting used to it.

FIG. 10 is a schematic diagram of the casting state of a conventional general twin belt continuous casting machine. When molten metal 5 is injected from the molten metal supply device 4 disposed on the upper side of the mold into a mold that is continuously formed by Since the slab 6 is cooled and solidified by moving to the lower side without causing a relative slip between the slab 6 and the slab 6, the solidified slab 6 can be taken out continuously and easily at high speed.

Furthermore, recently there has been a growing trend to produce thin sheets directly from copper slabs by only cold rolling without hot rolling, so wide and ultra-thin slabs have been produced. Attempts have also been made to apply the twin-belt continuous casting machine, which is capable of high-speed casting, to the casting of steel. By the way, in such a twin-belt continuous casting machine, it is necessary to uniformly inject molten metal into the gap between the upper and lower belts, which are wide and have an extremely narrow interval. A gutter or a narrow nozzle, such as the one shown with reference numerals 7 in Figures 11A to 1D, is indispensably used.

Figures 11A and 11B show the molten metal supply gutter for supplying overflow to the molten metal surface in the mold in the state shown in Figure 10, Figure 11C shows the molten metal supply nozzle, and Figure 11D shows the molten metal supply gutter. FIG. 3 is a schematic perspective view showing examples of dip box nozzles. The immersion box nozzle shown in FIG. 11D is placed immersed in the molten metal in the mold as shown in FIG. Basically, the molten metal is continuously supplied from a tundish, etc., as shown by reference numeral 8 in FIG. 11A, and is supplied by overflowing, as shown in FIGS. 11A and 11B. It is no different from a molten metal supply gutter.

(Problems to be Solved by the Invention) However, the conventional hot water supply method using such a gutter or nozzle has the following problems, especially when casting thin sheets of metal with a relatively high melting point. These problems were a major obstacle to obtaining a satisfactory product.

That is, in overflow hot water supply using a gutter or submerged box nozzle as shown in Figure 11 A, B, and D, the surface (free surface) of the molten metal in the mold is affected by the molten metal flow injected by the overflow. It is easy to cause rippling, which causes double skin, etc., and the surface skin of the slab obtained is more likely to deteriorate than that of conventional materials. Furthermore, extremely difficult control means are required to control the amount of hot water supplied and the hot water level to alleviate these inconveniences, as the hot water level exists within the mold of the twin-belt continuous caster. , it is difficult to seal the molten metal,
It is possible to avoid troublesome problems such as the formation of inclusions due to oxidation, non-metallic inclusions drawn in from hot water supply equipment such as tundishes, etc., which do not have time to float and are all trapped in the slab. Moreover, when using a hot water supply nozzle as shown in FIG. 11C, there was a problem that the nozzle was easily clogged when applied to molten metal with a high melting point such as molten steel.

From the above points of view, even when casting metals with high melting points such as steel, it does not cause deterioration of the surface of the slab, and it also prevents non-metallic inclusions due to oxidation of the molten metal surface and entrainment from the tundish. We have discovered a method of supplying molten metal to a twin-belt continuous caster that can minimize the amount of molten metal and ensure smooth operation without the risk of nozzle clogging or other molten metal supply failures, thereby stably producing high-quality, wide, thin-walled slabs. As a method for supplying molten steel, one of the present applicants has published Japanese Patent Application Laid-Open No. 60-49839.
No., JP-A-60-49838, JP-A-59-104254,
JP-A-59-104256 and JP-A-59-104255
We proposed the hot water supply method described in the issue. Below, these 5
This hot water supply method is called a contact hot water supply method in contrast to the hot water supply method shown in FIGS. 10 to 12 described above.

However, each of these contact hot water supply methods is
The drawbacks of the hot water supply methods shown in Figures 0 to 12 can be solved, and the present invention provides an apparatus ( (hereinafter referred to as "hot water supply nozzle support device").

By the way, these five hot water supply methods have in common: (A) A hot water supply nozzle with the full width of the mold is used as the molten metal supply device to inject the molten metal into the mold, which has a narrow gap. It is necessary to prevent the supplied molten metal from wrapping around the outer circumferential surface of the nozzle and forming a free surface within the mold. In the hot water supply method described in No. 60-49839 and Japanese Patent Application Laid-open No. 60-49838, between the inner surface of the mold of a twin belt continuous casting machine consisting of upper and lower belts and left and right side dam blocks, and the outer circumferential surface of the nozzle,
Also, JP-A-59-104254, JP-A-59-104256
In the hot water supply method described in JP-A-59-104255 and JP-A-59-104255, a maximum of 2 mm is formed between the inner surface of the mold and the outer circumferential surface of the nozzle of a twin-belt continuous casting machine consisting of upper and lower belts and left and right side dam blocks. By leaving a gap, even when the belt or side dam block rotates, the nozzle will come into contact with them and no friction will occur. Due to the rotational movement of the dam block, the viscous molten metal is drawn in the direction opposite to the direction in which it enters the gap, so leakage of the molten metal from the gap is prevented, and the molten metal wraps around the outer circumferential surface of the nozzle and forms the mold. There is no possibility of forming a free surface within the surface.

Of course, the allowable range of this gap varies depending on the slab thickness, casting speed, type of molten metal, etc. For example, in the case of molten steel, when the mold is moved, h < 20 mm, v < 6 m. /min condition: d<4
mm, h<60mm, v<6m/min: d<2
There will be no steel leakage if the following conditions are satisfied: h: Molten steel head (mm), v: Casting speed (m/min), d: Gap between the inner surface of the mold and the outer circumferential surface of the nozzle (mm) )], Generally, if the gap is 2 mm or less, no leakage will occur regardless of the type of molten metal.

Therefore, in order to make the most of the effects of the contact molten metal method having these characteristics, it is extremely important to invent a molten metal nozzle and its supporting device that take into consideration the following points. That is, (a) It is necessary to prevent the metal from cooling and solidifying at the tip of the nozzle and causing nozzle clogging, and for this purpose, the hot water supply nozzle is preheated with a burner until just before casting. During preheating, the hot water supply nozzle is kept at least 0.5 to 1 m away from the continuous casting machine to prevent the flame of the burner from touching the continuous casting machine.

Next, just before the start of casting, the burner must be removed, and the hot water nozzle must be quickly moved to a predetermined position at the inlet of the continuous caster and set. This is because the temperature of the otherwise preheated nozzle tip will drop rapidly.

(b) On the other hand, the gap between the outer peripheral surface of the nozzle tip and the inner surface of the mold should be set to 2 mm or less, but the maximum setting error allowed in both the vertical and horizontal directions is ±0.5 mm.
That's about it.

(c) Furthermore, the support device itself must have sufficient rigidity so as not to undergo elastic deformation, and the position of the nozzle tip must not be misaligned due to deformation of the support device itself due to heat during casting.

By the way, the present inventors have already proposed the invention described in Japanese Patent Application No. 1982-201417 as an apparatus for realizing the overflow type hot water supply method shown in FIG.

Therefore, in the contact hot water supply method, the above-mentioned patent application
- From the nozzle described in No. 201417 for overflow hot water supply to JP-A-59-104254, JP-A-59-
104256 or Japanese Patent Application No. 59-104255, it would be sufficient as a hot water supply nozzle support device, but in reality, the nozzle in the device described in Japanese Patent Application No. 57-201417 When casting was performed by replacing it with a close-contact hot water nozzle, it ended in failure.

The reason for this is that although condition (a) above was satisfied, it was extremely difficult to satisfy conditions (b) and (c).

That is, before preheating the nozzle, make fine adjustments while visually checking the 2 mm gap between the outer surface of the nozzle and the inner wall of the mold using a feeler gauge, etc., at the casting position, then move the secondary tundish shuttle car backwards and set the hot water supply nozzle to the secondary position. After preheating the tandaishi together with a burner to about 1000℃,
When the child tundish was advanced to the casting position again, the nozzle sometimes did not enter the mold properly. Incidentally, when setting in this hot state, it is no longer possible to finely adjust the position of the nozzle using a feel gauge because of the risk of burns.

The reason why the nozzle was misaligned with respect to the continuous casting machine once it was preheated is as follows.

The present inventors continuously monitored the thermal deformation of the child tundish during preheating in the horizontal and vertical directions using a differential transformer, and found that the total length of the child tundish increased by approximately 10 to 15 mm as preheating progressed. The tip of the nozzle was displaced downward by 3 to 5 mm due to thermal deformation of the secondary cylinder. This is because the secondary tank consists of an iron shell and lining bricks, and its capacity is relatively large, capable of holding approximately 1 ton of molten steel. This is understood to be because the expansion is on an order of magnitude that cannot be ignored.

From this experience, the present inventors came to the intermediate conclusion that the close contact hot water supply nozzle and its support device should have the following properties.

The nozzle should not be affected by thermal deformation of the iron skin of the child tundish, which is not cut from the child tundish.

As a result, the nozzle has a container-like shape. Hereinafter, this will be referred to as a reservoir nozzle.

As a measure to minimize thermal deformation of the reservoir nozzle, (a) Make the entire reservoir nozzle as small as possible. In addition, in an experimental example by the present inventors, a reservoir nozzle with a capacity of 80 kg was designed and manufactured for a slab width of 600 mm, and the reservoir nozzle had a capacity of 1/1
It became less than 10.

(b) The reservoir nozzle is not composed of an iron shell and firebrick lining, but is integrally molded from a refractory material with an extremely low coefficient of thermal expansion. In the embodiments of the present inventors, this reservoir nozzle was manufactured by integral molding by pouring fused silica. The amount of linear expansion of fused silica is 0.10% at 1000℃, and 90%
This value is extremely small compared to that of Al ₂ O ₃ refractories, which is 0.68%, and the amount of linear expansion of a steel shell made of carbon steel, which is 0.32% when the temperature is raised to 250°C.

Furthermore, the structure of the invention described in Japanese Patent Application No. 57-201417 is not suitable for the close-contact hot water supply method. In response to the proposition of the close hot water supply method that the hot water supply method must be maintained at the same time, looking at the configuration of the invention described in Japanese Patent Application No. 57-201417, the hot water supply nozzle is attached to the child tundish, and the child tundish is It is loaded onto the dumpling cart so that it can be grated freely. The secondary caster is supported by a running rail and a frame, which are supported by a foundation, and a continuous casting machine is supported on this foundation via a base. Although it is desirable to directly align the nozzle and the inlet of the continuous casting machine, there are many structures interposed between them. For this reason, during casting operations that last several hours, various vibrations transmitted through the foundation from peripheral equipment in the factory and thermal deformation of the intervening structures mentioned above due to the rise in ambient temperature during casting can cause damage to the gaps. It is quite possible that this would have an adverse effect on the close contact hot water supply method, which is sensitive to precision.

Therefore, as a support device for a hot water supply nozzle for the contact hot water supply method, in addition to the requirements shown in (1) to (2) above, it is necessary to take into account the following requirements.

Of course, a trolley that runs back and forth is necessary to preheat the reservoir nozzle, but we have devised a way to make this trolley so that when the reservoir nozzle approaches the inlet of the continuous casting machine, the reservoir nozzle is directly centered from the continuous casting machine. be able to do so.

Therefore, in order to satisfy the above requirements, the first
A reservoir nozzle and its support device as shown in FIGS. 3 to 15 were invented by the present inventors. This is the offset amount L of the upper and lower pulleys on the entrance side of the continuous casting machine.
This is an excellent invention in that it satisfies all of the above requirements, since the reservoir nozzle is completely loaded on the lower belt. This method will be referred to as the "caster belt loading type contact hot water supply method", hereinafter referred to as the "belt loading type" for short.

In this belt loading type, the reservoir nozzle 10 is supported by a reservoir nozzle support frame 11 (hereinafter referred to as "support frame"), and the tip of the nozzle is connected to the upper and lower belts 2, 2' and the side dam block 3. It is inserted into a mold with a constant gap of 2 mm or less. For this purpose, the support frame 10 is provided with an upper roll 12, a lower roll 13 and a horizontal guide roll 14.

Therefore, the upper roll 12, the lower roll 13,
The horizontal guide roll 14 rotates in contact with the upper belt 2, the lower belt 2', and the left and right side dam blocks 3, which respectively constitute the inner wall of the mold.

Further, since the support frame 11 can be seen as a trolley functionally, when preheating the reservoir nozzle 10, the guide rail 15 is used as shown in FIG.
Move it over to the preheating location and turn on burner 16.
It can be preheated by

By the way, subsequent experiments and research by the present inventors have revealed that this belt-loaded contact hot water supply method actually has a certain problem.

In other words, as is clear from the above explanation, the premise that there is no risk of steel leakage as long as the gap d between the outer peripheral surface of the nozzle and the inner surface of the mold is 2 mm or less is based on the premise that there is no risk of steel leakage.
No. 49839, JP-A No. 60-49838, or the case where h in FIG. 14 is 60 mm.

Therefore, steel leakage from the gap d is caused by static pressure of molten steel brought to the lower part of the nozzle tip by h, and if h<60 mm, d must naturally be smaller than 2 mm. On the other hand, in the case of the belt loading type, as can be seen from FIG. 14, it is difficult to design h to a small value of about 60 mm in actual design.

The reason is that when h is small, ho
The hot water level must be maintained and controlled at the location shown in . On the other hand, the hot water level detection sensor 17 for controlling the hot water level is extremely difficult to design if the hot water level escapes to the back of the nozzle. However, if it is at the level h in FIG. 14, it is convenient that a sensor 17 for detecting the hot water level can be provided in a wide space slightly behind the center of the reservoir nozzle 10.

Therefore, in other words, in a twin-belt continuous casting machine, the belt-loading close-contact hot water supply method will not work if the level of hot water in the reservoir nozzle 10 becomes high as the device design progresses. I have no choice.

In order to avoid this problem, the inclination angle θ of the continuous casting machine shown in FIG. If it is less than 4 degrees, the static pressure of molten steel at the center of the slab in the continuous caster is insufficient, the contact pressure between the slab surface and the cooling belt surface decreases, and the formation of a solidified shell in the continuous caster becomes unstable. It is known that as the surface ages, the surface quality deteriorates (it becomes uneven).

To summarize the above, the belt loading type is
However, there are inherent problems in designing the steel bath in the reservoir to be as shallow as 60 mm, which is accompanied by various design difficulties and issues with the quality of the slab.

Accordingly, it is an object of the present invention to provide a nozzle for close contact hot water supply and its support device that satisfies the above-mentioned requirements and is free from the problems encountered in the belt-loading type.

(Means for Solving the Problems) The present invention is an apparatus for supplying molten metal to a horizontal or inclined metal twin-belt continuous casting machine, which comprises a molten pool part and a tip hot-water supply part, and the twin belt A reservoir nozzle truck that loads a reservoir nozzle whose tip end is precisely fitted into a mold formed by upper and lower pulleys and a side dam block interposed between these pulleys when supplying hot water to a continuous casting machine; A cart that can move toward and away from the twin-belt continuous casting machine, which has a reservoir nozzle cart hung on its tip; The main frame of the twin-belt continuous casting machine is provided with a support arm extending overhanging the main frame of the twin-belt continuous casting machine, on which a rail having an inclination equal to the casting angle is laid to position the reservoir nozzle. This is a molten metal supply device to a twin belt continuous casting machine.

(Function) The present invention is an apparatus for supplying molten metal to a horizontal or inclined twin-belt continuous casting machine for metal, and includes a molten metal pool portion and a tip molten metal supply portion, and is provided with a device for supplying molten metal to the twin-belt continuous casting machine. A reservoir nozzle truck whose tip is loaded with a reservoir nozzle that is precisely fitted into a mold formed by upper and lower pulleys and a side dam block interposed between these pulleys; a dolly mounted thereon that is movable toward and away from the twin belt continuous casting machine; and when the dolly approaches the twin belt continuous caster, the reservoir nozzle is positioned by receiving the wheels of the reservoir nozzle dolly. In order to achieve this, the main frame of the twin-belt continuous caster is equipped with a rail with an inclination equal to the casting angle, and a support arm is provided that protrudes from the main frame. It becomes possible to accurately and quickly position the machine with respect to the twin belt continuous casting machine.

(Example) The present invention will be described in detail below based on the example shown in FIGS. 1 to 9. Note that the same numbers as in FIGS. 10 to 15 indicate the same or corresponding parts, and detailed description thereof will be omitted.

Reference numeral 18 denotes a reservoir nozzle truck on which the reservoir nozzle 10 is loaded, and a hardware receiver 19 protruding from both upper surfaces of the reservoir nozzle truck 18 and an L-shaped hardware 20 bolted to the hardware receiver 19.
The reservoir nozzle 10 is attached to the reservoir nozzle truck 18 by.

21 is a spacing setting arm which is pivotally connected to both sides of the reservoir nozzle truck 18 and has a substantially triangular shape when viewed from the side;
Cam followers 22 are pivotally attached to two apex portions on the tip side of the interval setting arm 21, and when the reservoir nozzle truck 18 approaches the twin belt continuous casting machine (hereinafter referred to as "caster") 24, the upper and lower belts 2 , 2', respectively, and are configured to rotate freely while abutting against them.

By the way, as is clear from FIGS. 2 and 3, this spacing setting arm 21 is connected to the side dam block 3.
It is located on the outside across the . This is because if the spacing setting arm 21 is also disposed between the left and right side dam blocks 3, the width of the nozzle of the reservoir nozzle truck 18 and the child tundish 32 becomes narrow, making it difficult to carry out appropriate dimensional design. Particularly in FIG. 2, if the width of the tip from which molten steel is discharged is too large compared to the width of the base of the reservoir nozzle 10, the injection flow may not spread sufficiently.

23 is a main frame of the caster 24, and a support frame 2 is provided in an overhanging manner on the entrance side of the main frame 23.
A wheel 27 provided on the reservoir nozzle truck 18 rides on a rail 26 attached to the support arm 25 when approaching the caster 24. By the way, this rail 26
The inclination of wheel 2 is made equal to the casting angle.
7 moves slightly back and forth on the rail 26, the movement of the reservoir nozzle 10 becomes parallel to the upper and lower belts 2, 2', and the reservoir nozzle 1
When positioning 0, the belt 2 whose tips are upper and lower,
Care is taken to avoid contact with 2'.

28 is a horizontal roll rotatably installed on the back side of the bottom wall of the reservoir nozzle truck 18;
the horizontal roll 28 and the cam follower 22
Due to this action, when the reservoir nozzle carriage 18 approaches the caster 24, positioning during casting can be performed with high precision.

Reference numeral 29 denotes a cart on which the reservoir nozzle cart 18 is hung at its tip.
It is designed to move on top. In this embodiment, the cart 29 is shown to also serve as a child tundish car.

The operating sequence of the molten metal supply device of the twin belt continuous caster constructed as described above will be described below.

First, when preheating the reservoir nozzle 10, the sixth
As shown in the figure, the truck 29 is moved away from the casters 24. At this time, the reservoir nozzle truck 18 loaded with the reservoir nozzle 10 is hung on the protrusion 31 at the tip of the truck 29, and its bottom is supported by the protrusion 34 at the tip. In this state, the hot water supply section at the tip of the reservoir nozzle 10 and the child tundish 32 placed on the trolley 29 are preheated using, for example, a gas burner 33.

Next, when preheating is completed, the trolley 29 is brought closer to the casters 24. In Figure 7, trolley 29 is the sixth
Move closer to the caster 24 from the position shown in the figure,
The rail 2 just installed on a part of the rail 30
This shows the point at which the vehicle begins to descend a steeper slope than the slope provided at No. 6.

At this point, the weight of the reservoir nozzle truck 18 is supported by the projections 31 and 34 of the truck 29, and therefore the wheels 27 are still floating from the rails 26.

Then, when the truck 29 moves closer to the caster 24 and reaches the position shown in FIG. 8, the wheels 27 of the reservoir nozzle truck 18 are positioned on an inclined surface having an angle equal to the casting angle of the rail 26. . Therefore, a moment later, the protrusion 31 and the protrusion 34 of the truck 29 are separated from the reservoir nozzle truck 18.

FIG. 9 shows a state in which the wheels 35 of the truck 29 come into contact with a stopper 36 provided on the rail 30 and are stopped. The cam follower 22 rolls on the upper and lower belts and stops when it comes into contact with the upper and lower belts 2 and 2'.

On the other hand, centering of the reservoir nozzle 10 in the width direction is started from the stage shown in FIG. 7, and the horizontal roll 28 plays this role as described above.

Thus, the weight of the reservoir nozzle 10 and the reservoir nozzle truck 18, which had been supported by the truck 29, is now completely supported by the caster 24 from the position shown in FIG. At the same time, the reservoir nozzle 10 and the reservoir nozzle truck 18 are most directly centered from the caster 24.

In addition, in FIGS. 1 to 3, the spring 37 and roller 38 attached to the truck 29 are connected to the reservoir nozzle truck 18 and the reservoir nozzle 10.
, the caster 24 via the cam follower 22
This is to firmly press and hold it.

Further, numeral 43 in FIG. 1 is a stopper for the spacing setting arm 21.

Furthermore, since the reservoir nozzle 10 is filled with high-temperature molten metal, its outer surface also becomes extremely hot. Therefore, the temperature of the reservoir nozzle truck 18 on which the reservoir nozzle 10 is loaded also increases, and there is a possibility that the tip position of the reservoir nozzle 10 may be misaligned due to thermal deformation.

In such a case, this problem can be solved by providing the reservoir nozzle truck 18 with a water-cooled structure as shown in FIG.

(Effects of the Invention) As explained above, the present invention is an apparatus for supplying molten metal to a horizontal or inclined metal twin belt continuous casting machine, which comprises a molten metal pool part and a tip hot water supply part, and the twin belt continuous casting machine A reservoir nozzle truck that loads a reservoir nozzle whose tip end is precisely fitted into a mold formed by upper and lower pulleys and a side dam block interposed between these pulleys when hot water is supplied to a casting machine, and the reservoir nozzle. a dolly that is movable toward and away from the twin belt continuous casting machine, the dolly having a nozzle dolly hanging thereon at its tip; and a dolly that receives the wheels of the reservoir nozzle dolly when the dolly approaches the twin belt continuous casting machine. In order to position the reservoir nozzle, the main frame of the twin-belt continuous caster is equipped with a rail with an inclination equal to the casting angle. This invention enables the reservoir nozzle in the hot water supply method to be accurately and quickly positioned relative to the twin belt continuous casting machine, and is an extremely effective invention in realizing the close contact hot water supply method.

[Brief explanation of drawings]

1 to 9 are explanatory diagrams showing one embodiment of the device of the present invention, in which FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a cross-sectional view of FIG. 1, and FIG. 5 is a cross-sectional view showing the details of the reservoir nozzle truck, FIGS. 6 to 9 are explanatory diagrams when the device of the present invention is used, and FIGS. 10 to 15 are sectional views. These are conventional explanatory diagrams, and Figs. 10 to 12 are for overflow hot water supply, and Figs. 13 to 12 are for overflow hot water supply.
FIG. 15 is an explanatory diagram in the case of close contact hot water supply. 10 is a reservoir nozzle, 18 is a reservoir nozzle truck, 21 is a spacing arm, 22 is a cam follower, 25 is a support arm, 26 is a rail, 28 is a horizontal roll, 29 is a truck, and 32 is a child tundish.

Claims (1)

[Scope of Claims] 1. A device for supplying molten metal to a horizontal or inclined metal twin-belt continuous casting machine, comprising a molten metal pool portion and a tip molten metal supply portion, and is capable of supplying molten metal to the twin-belt continuous casting machine. a reservoir nozzle truck whose tip is loaded with a reservoir nozzle that is precisely fitted into a mold formed by upper and lower pulleys and a side dam block interposed between these pulleys;
a cart that can move towards and away from the twin belt continuous casting machine, on which the reservoir nozzle cart is hung at its tip; and a wheel of the reservoir nozzle cart when the cart approaches the twin belt continuous casting machine. The main frame of the twin-belt continuous casting machine is provided with a support arm extending in the form of an overhang, on which a rail having an inclination equal to the casting angle is laid in order to receive and position the reservoir nozzle. Molten metal supply device to twin belt continuous casting machine. 2. The molten metal supply device for a twin-belt continuous casting machine according to claim 1, characterized in that the reservoir nozzle truck is provided with a horizontal roll for positioning the reservoir nozzle truck in the width direction. 3. A cam follower according to claim 1, characterized in that a cam follower is pivotally mounted on the reservoir nozzle truck to position the reservoir nozzle truck by coming into contact with the upper and lower belts at the entrance of the twin-belt continuous casting machine when approaching the twin-belt continuous casting machine. Molten metal supply device to twin belt continuous casting machine. 4. The molten metal supply device to a twin belt continuous casting machine according to claim 1, wherein the reservoir nozzle truck has a water-cooled structure. 5. The molten metal supply device to a twin belt continuous casting machine according to claim 1, wherein the reservoir nozzle is integrally molded from a refractory material. 6. The apparatus for supplying molten metal to a twin-belt continuous casting machine according to claim 1, characterized in that the cart also serves as a sub-tandashi car.