JP2021120487A - Molten metal discharge device, film forming device and molten metal discharge method - Google Patents

Abstract

To discharge molten metal with a simple mechanism.SOLUTION: A molten metal discharge device (1) has a melting tank (10), a suction pipe (20) that sucks up molten metal (M1) from a first end (22) to guide the molten metal (M1) from a second end (23) to outside of the melting tank (10), and a spraying pipe (30A,30B) that sprays a gas to the second end (23) of the suction pipe (20), thereby discharging the molten metal (M1) guided to outside of the second end (23) to an object.SELECTED DRAWING: Figure 2

Description

The present invention relates to a molten metal discharge device, a film forming device, and a molten metal discharge method.

A technique of spraying a metal onto an object is known as a conventional technique. For example, in the method for manufacturing an outer surface anticorrosion tube disclosed in Patent Document 1, in order to form an anticorrosion film composed of a specific composition, two types of wire rods composed of different materials are used for arc spraying. This forms a film.

Japanese Unexamined Patent Publication No. 2013-241682 (published on December 5, 2013)

However, in the method for manufacturing an outer surface anticorrosion tube disclosed in Patent Document 1, since two types of wire rods made of different materials are used for arc spraying, a material for holding the two types of wire rods is required. , The mechanism for arc spraying becomes complicated. In addition, since noise, fume, light, etc. are generated during arc spraying, many peripheral equipment such as a thermal spraying device, a booth surrounding the object to be sprayed, and a dust collecting facility are required. As described above, there is room for improvement in the method for manufacturing the outer surface anticorrosion tube disclosed in Patent Document 1. One aspect of the present invention is to discharge a molten metal to an object by a simple mechanism.

In order to solve the above-mentioned problems, the molten metal discharge device according to one aspect of the present invention comprises a melting tank for storing the molten metal and the first end inserted into the molten metal stored in the melting tank. A suction pipe that sucks up the molten metal and guides the molten metal from the second end opposite to the first end to the outside of the melting tank, which is exposed to the outside of the melting tank, and the suction pipe. By blowing a gas toward the second end of the pipe, a negative pressure is generated in the vicinity of the second end to generate a suction force of the molten metal in the suction pipe, and the second end is generated. It is provided with a spray pipe for discharging the molten metal guided to the outside of the above.

According to the above configuration, since the gas is blown toward the second end of the suction pipe, a negative pressure is generated in the vicinity of the second end, so that the molten metal is sucked up by the suction pipe to the outside of the melting tank. The molten metal can be discharged. Therefore, the molten metal can be discharged by a simple mechanism.

The gas spray port in the spray pipe may be arranged behind the discharge port when viewed from the side facing the discharge port of the molten metal formed at the second end. According to the above configuration, it is possible to prevent the gas from the blowing port of the blowing pipe from being blown to the end surface of the discharging port of the suction pipe. As a result, it is possible to prevent the end face of the discharge port of the suction pipe from being cooled by the gas, and to prevent the molten metal from solidifying in the vicinity of the second end of the suction pipe. Further, by arranging the spray port in this way, a negative pressure can be stably and surely generated in the vicinity of the second end.

The suction pipe may be configured so that the direction from the second end to the first end of the suction pipe is the same as the direction of gravity. According to the above configuration, when the discharge of molten metal is stopped by stopping the spraying of gas, the molten metal in the suction pipe moves downward according to gravity, and the molten metal in the suction pipe is transferred to the melting tank. return. As a result, it is possible to prevent the molten metal from solidifying in the suction pipe, and it is possible to facilitate maintenance of the molten metal discharge device.

The molten metal discharge device may further include a heating means for heating the suction pipe. According to the above configuration, the molten metal in the suction pipe is also heated, so that it is possible to prevent the molten metal in the suction pipe from solidifying.

The molten metal discharge device changes the relative positions of the melting tank with respect to the load meter for measuring the total weight of the molten metal and the melting tank stored in the melting tank and the suction pipe and the blowing pipe. A moving portion that moves at least one of the melting tank, the suction pipe, and the spray pipe, and the amount of decrease in the total weight measured by the load meter per unit time are within a predetermined range. A control device for controlling the moving unit may be further provided so as to fit inside.

According to the above configuration, the discharge amount of the molten metal to be discharged can be made substantially constant. Therefore, for example, when the molten metal is discharged to a rotating object, the molten metal can be uniformly adhered to the object.

The film forming apparatus according to one aspect of the present invention is a film forming apparatus that forms a film on the outer surface of a tube as an object, and includes a rotating portion that rotates the tube and the tube that is rotated by the rotating portion. The molten metal discharging device for discharging the molten metal for forming the film on the outer surface of the above may be provided. According to the above configuration, a film forming apparatus for forming a film on the outer surface of the pipe by discharging the molten metal to the outer surface of the pipe can be realized by a simple mechanism.

In the molten metal discharge method according to one aspect of the present invention, the molten metal is stored in the melting tank, and the molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank. Using a step of preparing a suction pipe that guides the molten metal to the outside of the melting tank from a second end opposite to the first end, which is exposed to the outside of the melting tank, and a spray pipe. By blowing a gas toward the second end of the suction pipe, a negative pressure is generated in the vicinity of the second end to generate a suction force of the molten metal in the suction pipe, and the suction force is generated. It includes a step of discharging the molten metal guided to the outside of the second end.

According to one aspect of the present invention, the molten metal can be discharged by a simple mechanism.

It is a schematic diagram which shows the structure of the film forming apparatus as a reference example. It is a schematic diagram which shows the structure of the film forming apparatus which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the structure of the modification of the molten metal discharge apparatus provided in the film forming apparatus shown in FIG. It is a schematic diagram which shows the structure of the molten metal discharge apparatus which concerns on Embodiment 2 of this invention. It is a schematic diagram which shows the structure of the molten metal discharge apparatus which concerns on Embodiment 3 of this invention.

[Embodiment 1]
(About the principle of discharging molten metal)
First, the principle of discharging the molten metal will be described with reference to FIG. FIG. 1 is a schematic view showing the configuration of a film forming apparatus 100R as a reference example. In FIGS. 1 to 5, the solid arrow indicates the flow of gas, and the dotted arrow indicates the flow of the molten metal M1. As shown in FIG. 1, the film forming apparatus 100R includes a molten metal discharge apparatus 1R and rotating rollers C1 and C2 (rotating portions). The molten metal discharge device 1R includes a melting tank 10R, a suction pipe 20R, and a spray pipe 30R.

As shown in FIG. 1, by blowing gas from the spray port 31R of the spray pipe 30R toward the end face of the discharge port 21R of the suction pipe 20R, a negative pressure is generated in the vicinity of the end face of the discharge port 21R. .. As a result, the suction force of the molten metal M1 is generated in the suction pipe 20R, and the molten metal M1 stored in the melting tank 10R is sucked up by the suction pipe 20R. The molten metal M1 discharged from the discharge port 21R is sprayed by the gas from the spray pipe 30R onto the outer surface of the pipe T1 rotated by the rotating rollers C1 and C2. Examples of the pipe T1 include a ductile cast iron pipe (an example of a metal pipe).

(Structure of film forming apparatus 100)
The configuration of the film forming apparatus 100 will be described with reference to FIG. FIG. 2 is a schematic view showing the configuration of the film forming apparatus 100 according to the first embodiment of the present invention. In FIG. 2, the figure surrounded by the dotted line L1 is a front view of the film forming apparatus 100, and the figure surrounded by the dotted line L2 is a plan view of the molten metal discharge device 1. Further, in the figure surrounded by the dotted line L1 in FIG. 2, the direction from the molten metal discharge device 1 toward the pipe T1 is upward.

The film forming apparatus 100 is an apparatus for forming a film on the outer surface of the tube T1 as an object. As shown in FIG. 2, the film forming apparatus 100 includes a molten metal discharge apparatus 1 and rotating rollers C1 and C2. The molten metal discharge device 1 is a device that is arranged above the molten metal discharge device 1 and discharges the molten metal M1 to the outer surface of the pipe T1 that is rotated by the rotating rollers C1 and C2.

However, the present invention is not limited to a device that discharges the molten metal M1 to the outer surface of the pipe T1. The present invention is also applied to an apparatus for producing powder of molten metal M1 by discharging molten metal M1.

The molten metal discharge device 1 includes a melting tank 10, a suction pipe 20, spray pipes 30A and 30B, a load meter 40, a moving unit 50, and a control device 60. At least one of the rotating rollers C1 and C2 is a driving roller, and the rest are driven rollers. The rotating rollers C1 and C2 rotate while being in contact with the pipe T1 to rotate the pipe T1 around the center of the pipe axis. The rotating rollers C1 and C2 are supported by a support base (not shown) so as to be arranged at a predetermined height from the ground.

The rotary rollers C1 and C2 can be replaced with a member or mechanism capable of rotating the pipe T1. For example, a rotating shaft may be provided at the center of the pipe T1 and the rotating shaft may be rotated by a belt or a chain.

In order to discharge the molten metal M1 over the entire length of the pipe T1, rotating rollers C1 and C2 or a base (not shown) provided with a pipe support member may be run in the pipe axial direction. Alternatively, the molten metal discharge device 1 may be driven in the direction of the pipe axis. Alternatively, by arranging all the rotation axes of the rotary rollers C1 and C2 at an angle with respect to the tube axis, the tube T1 runs in the direction of the tube axis according to the rotation of the tube T1 (the tube T1 is placed on the tube axis). The rotating rollers C1 and C2 may be provided with a pipe traveling function (so as to travel in the direction of the center). Of course, both the pipe rotating device and the molten metal discharging device 1 may be driven in the pipe axial direction.

As described above, in the film forming apparatus 100, in addition to the molten metal discharge device 1 and the pipe rotating portion, a traveling portion (not shown) that allows at least one of the pipe rotating device and the molten metal discharging device 1 to travel in the pipe axial direction. May be provided.

The upper part of the melting tank 10 is open, and the molten metal M1 is stored (a step of storing the molten metal). The material of the melting tank 10 and the suction pipe 20 is preferably not affected by the molten metal M1, and is preferably SUS316L, for example. The melting tank 10, the suction pipe 20, and the spray pipes 30A and 30B are made of metal, but the present invention is not limited to this, and may be made of non-metal such as alumina, carbon, silicon carbide, or silica.

A heater (not shown) such as a heater may be provided around the melting tank 10 as a heating means for heating the melting tank 10. In this case, the wall portion of the melting tank 10 has a structure in which the heater is sandwiched between two plate portions (not shown). As a result, it is possible to prevent the molten metal M1 in the melting tank 10 from solidifying. Further, the molten metal discharge device 1 may include a gas burner, a mechanism for discharging heated air, or the like instead of the heater as a heating means for heating the melting tank 10.

The molten metal M1 is a material for forming a film formed on the outer surface of the tube T1. The raw material of the molten metal M1 preferably contains at least one metal having a low melting point such as Zn (zinc), Sn (tin), and Al (aluminum). Further, the melting point of the molten metal M1 is preferably lower than the melting point of the melting tank 10 and the suction pipe 20 in contact with the molten metal M1. The molten metal M1 may be an alloy composed of two or more kinds of metals.

When the raw material of the molten metal M1 is a metal having a low melting point, the raw material of the molten metal M1 can be easily melted, and the molten metal M1 stored in the melting tank 10 can be easily produced. Further, the raw material of the molten metal M1 may be melted in the melting tank 10, or may be stored in the melting tank 10 after being melted in a melting furnace for melting the raw material of the molten metal M1.

The first end 22 of the suction pipe 20 is inserted into the molten metal M1 stored in the melting tank 10. The second end 23 of the suction pipe 20 opposite to the first end 22 is exposed to the outside of the melting tank 10. That is, the second end 23 is arranged above the upper end of the melting tank 10.

The suction pipe 20 sucks the molten metal M1 from the first end 22 and guides the molten metal M1 from the second end 23 to the outside of the melting tank 10. The position of the suction pipe 20 is fixed by being supported by a jig (not shown). In FIG. 2, the molten metal discharge device 1 includes one suction pipe 20, but may include two or more suction pipes 20. When the molten metal is discharged, such a suction pipe 20 is prepared (a step of preparing the suction pipe).

The suction pipe 20 is configured so that the direction D1 from the second end 23 to the first end 22 of the suction pipe 20 is the same as the direction G1 of gravity. According to the above configuration, when the discharge of the molten metal M1 is stopped by stopping the spraying of gas, the molten metal M1 moves downward in the suction pipe 20 according to the gravity, so that the molten metal in the suction pipe 20 is stopped. M1 returns to the melting tank 10. As a result, it is possible to prevent the molten metal M1 from solidifying in the suction pipe 20, and it is possible to facilitate maintenance of the molten metal discharge device 1.

The spray pipes 30A and 30B are arranged above the melting tank 10, respectively, and are connected to a gas supply device (not shown) that supplies gas into the spray pipes 30A and 30B. By supplying gas into the blowing pipes 30A and 30B by the gas supply device, the blowing pipes 30A and 30B can each blow gas toward the second end 23 of the suction pipe 20. ..

When the spray pipes 30A and 30B blow gas toward the second end 23, a negative pressure is generated in the vicinity of the second end 23, and the suction force of the molten metal M1 is generated in the suction pipe 20. The spray pipes 30A and 30B are for discharging the molten metal M1 guided to the outside of the second end 23 into the pipe T1 as an object, respectively. That is, when the molten metal M1 is discharged, the molten metal M1 is discharged to the pipe T1 using the spray pipes 30A and 30B (step of discharging the molten metal).

The total amount of gas discharged from both the spray pipes 30A and 30B is an amount corresponding to a volume of gas that is 1000 times or more the volume per unit time of the molten metal M1 discharged to the pipe T1. Is preferable. As a result, the molten metal M1 can be atomized.

Further, the positional relationship between the suction pipe 20 and the spray pipes 30A and 30B and the total amount of gas discharged from both the spray pipes 30A and 30B are the total amount of gas discharged from the spray pipes 30A and 30B when the gas is discharged. , It is appropriately determined so that a negative pressure is generated in the vicinity of the second end 23.

The gas spray ports 31A and 31B of the spray pipes 30A and 30B are rearward of the discharge port 21 when viewed from the side facing the discharge port 21 of the molten metal M1 formed at the second end 23, respectively. Is located in. In other words, the spray ports 31A and 31B are arranged behind the discharge port 21 as viewed from the direction D2 from the pipe T1 toward the melting tank 10, respectively.

According to the above configuration, it is possible to prevent the gas from the spray ports 31A and 31B of the spray pipes 30A and 30B from being sprayed on the end surface of the discharge port 21 of the suction pipe 20. As a result, it is possible to prevent the end face of the discharge port 21 of the suction pipe 20 from being cooled by the gas, and to prevent the molten metal M1 from solidifying in the vicinity of the second end 23 of the suction pipe 20. Further, by arranging the spray ports 31A and 31B in this way, a negative pressure can be stably and surely generated in the vicinity of the second end 23.

The spray pipes 30A and 30B each have a curved shape in the middle. That is, the spray pipes 30A and 30B each extend toward the melting tank 10, and by bending in the middle, extend toward the discharge port 21. Thereby, the spray pipes 30A and 30B can be arranged so as not to come into contact with the melting tank 10.

The inner diameters of the spray pipes 30A and 30B are preferably equal to or less than the inner diameter of the suction pipe 20. This makes it easier to implement the molten metal discharge device 1 in terms of equipment when considering the amount of gas flowing in the spray pipes 30A and 30B and the amount of molten metal M1 flowing in the suction pipe 20. Because. In FIG. 2, the molten metal discharge device 1 includes two spray pipes 30A and 30B, but may include one or three or more spray pipes.

The load meter 40 is provided on the lower side of the melting tank 10 and measures the total weight of the molten metal M1 stored in the melting tank 10 and the melting tank 10. As the load cell 40, for example, a load cell can be used. The moving unit 50 moves the melting tank 10 in order to change the relative positions of the melting tank 10 with respect to the suction pipe 20 and the spray pipes 30A and 30B. The relative position is a relative position along the direction of gravity G1 (vertical direction).

The positional relationship between the suction pipe 20 and the spray pipes 30A and 30B is fixed by a jig (not shown) that supports the suction pipe 20 and the spray pipes 30A and 30B. As the moving unit 50, for example, an electric cylinder including an electric motor can be used. The moving portion 50 is connected to the lower side of the load meter 40.

The control device 60 controls the moving unit 50 so that the amount of decrease in the total weight measured by the load meter 40 per unit time is within a predetermined range. Specifically, it will be described below. The control device 60 is electrically connected to the load meter 40, and calculates the amount of decrease in the total weight measured by the load meter 40 as the discharge amount of the molten metal M1 discharged to the pipe T1. Further, in the control device 60, the moving unit 50 moves the melting tank 10 so that the discharge amount of the molten metal M1 becomes the discharge amount set value per unit time separately set by the setting unit (not shown). Control the amount.

According to the above configuration, the discharge amount of the molten metal M1 discharged to the pipe T1 as an object can be made substantially constant. Therefore, for example, when the molten metal M1 is discharged to the tube T1 as a rotating object, the molten metal M1 can be uniformly adhered to the tube T1 as an object.

The moving unit 50 preferably moves the melting tank 10, but the present invention is not limited to the device for moving the melting tank 10, and the suction pipe 20 and the spray pipe 30A, It is also applied to a device for moving 30B. The present invention is also applied to a device for moving both the suction pipe 20, the spray pipes 30A and 30B, and the melting tank 10. That is, in order to change the relative position of the melting tank 10 with respect to the suction pipe 20 and the spray pipes 30A and 30B, the moving portion 50 of the melting tank 10 and the suction pipe 20 and the spray pipes 30A and 30B. It moves at least one.

When the moving portion 50 moves the suction pipe 20 and the spray pipes 30A and 30B, the moving portion 50 is used as a jig (not shown) for supporting the suction pipe 20 and the spray pipes 30A and 30B. Be connected. Further, in this case, the control device 60 controls the movement amounts of the suction pipe 20 and the spray pipes 30A and 30B by the moving unit 50 so that the discharge amount of the molten metal M1 becomes a predetermined value.

As described above, according to the configuration of the molten metal discharge device 1, a negative pressure is generated in the vicinity of the second end 23 by blowing gas toward the second end 23 of the suction pipe 20, so that the suction pipe 20 The molten metal M1 can be sucked up and discharged to the outside of the melting tank 10. Therefore, the molten metal M1 can be discharged to the object by a simple mechanism.

Further, since the discharge of the molten metal M1 and the spraying of the gas are performed at the same time, the molten metal M1 and the gas can be easily mixed, and the molten metal M1 can be easily made finer. Further, a film forming apparatus 100 that forms a film on the outer surface of the tube T1 by discharging the molten metal M1 onto the outer surface of the tube T1 can be realized by a simple mechanism.

(Modification example)
Next, a modified example of the molten metal discharge device 1 will be described with reference to FIG. FIG. 3 is a schematic view showing a configuration of a modified example of the molten metal discharge device 1 included in the film forming device 100 shown in FIG. In FIG. 3, the moving unit 50 and the control device 60 are omitted. Here, a modified example of the molten metal discharge device 1 shown in FIG. 3 is referred to as a molten metal discharge device 1A. As shown in FIG. 3, the molten metal discharge device 1A is different from the molten metal discharge device 1 in that it includes a heater 70 (heating means).

The heater 70 covers at least a part of the side surface of the suction pipe 20. The heater 70 heats the suction pipe 20. According to the above configuration, the molten metal M1 in the suction pipe 20 is also heated, so that it is possible to prevent the molten metal M1 in the suction pipe 20 from solidifying. The heater 70 is preferably arranged with respect to the suction pipe 20 so as not to come into contact with the molten metal M1.

The molten metal discharge device 1A may include a gas burner, a mechanism for discharging heated air (an example of gas), or the like, instead of the heater 70, as a heating means for heating the suction pipe 20. The gas burner and the mechanism for discharging the heated air heat the suction pipe 20 by raising the temperature of the gas around the suction pipe 20.

Further, the molten metal discharge device 1A includes, instead of the heater 70, a box-shaped surrounding portion (not shown) that surrounds at least a part of the suction pipe 20 and at least a part of the spray pipes 30A and 30B. You may. In this case, the suction pipe 20 is heated by supplying a high-temperature gas to the inside of the surrounding portion by a gas burner, a mechanism for discharging heated air, or the like.

[Embodiment 2]
Embodiment 2 of the present invention will be described with reference to FIG. For convenience of explanation, the members having the same functions as the members described in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated. FIG. 4 is a schematic view showing the configuration of the molten metal discharge device 1B according to the second embodiment of the present invention. In FIG. 4, the moving unit 50 and the control device 60 are omitted. In FIG. 4, the figure surrounded by the dotted line L3 is a front view of the molten metal discharge device 1B, and the figure surrounded by the dotted line L4 is a plan view of the molten metal discharge device 1B. Further, in the figure surrounded by the dotted line L3 in FIG. 4, the direction from the melting tank 10 to the spray pipe 30C is the upward direction.

As shown in FIG. 4, in the molten metal discharge device 1B, the suction pipe 20 is changed to the suction pipe 20A and the spray pipes 30A and 30B are sprayed, respectively, as compared with the molten metal discharge device 1. It is different from the point that it is changed to pipes 30C and 30D. The suction pipe 20A has a curved shape in the middle. That is, the suction pipe 20A extends upward from its first end 22A and curves in the middle. As a result, the portion between the curved portion of the suction pipe 20A and the second end 23A on the side opposite to the first end 22A extends toward the pipe T1 which is the object for discharging the molten metal M1.

The spray ports 31C and 31D of the spray pipes 30C and 30D are arranged so as to face the second end 23A. The spray pipes 30C and 30D extend along a plane perpendicular to the direction of gravity G1. Further, as shown in the figure surrounded by the dotted line L4 in FIG. 4, the spray pipes 30C and 30D have the extending direction of the spray pipes 30C and 30D different from the curved portion of the suction pipe 20A when viewed from above. The portion between the two ends 23A is arranged so as to be inclined from the extending direction D3.

Further, in the spray pipes 30C and 30D, the center position of the discharge port 21A of the molten metal M1 formed at the second end 23A and the center position of the spray ports 31C and 31D coincide with each other when viewed from the lateral direction. Is located in.

The molten metal M1 from the second end 23A of the suction pipe 20A is discharged to the pipe T1. Therefore, in the configuration of the molten metal discharge device 1B, the molten metal M1 can be discharged from the lateral direction to the pipe T1. The lateral direction is a direction along a plane perpendicular to the direction of gravity G1.

[Embodiment 3]
Embodiment 3 of the present invention will be described with reference to FIG. For convenience of explanation, the members having the same functions as the members described in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated. FIG. 5 is a schematic view showing the configuration of the molten metal discharge device 1C according to the third embodiment of the present invention. In FIG. 5, the moving unit 50 and the control device 60 are omitted. In FIG. 5, the figure surrounded by the dotted line L5 is a front view of the molten metal discharge device 1C, and the figure surrounded by the dotted line L6 is a plan view of the molten metal discharge device 1C. Further, in the figure surrounded by the dotted line L5 in FIG. 5, the direction from the melting tank 10 to the spray pipe 30E is the upward direction.

As shown in FIG. 5, in the molten metal discharge device 1C, the suction pipe 20 is changed to the suction pipe 20B and the spray pipes 30A and 30B are sprayed, respectively, as compared with the molten metal discharge device 1. The difference is that the pipes are changed to the pipes 30E and 30F and the second spray pipe 32 is provided.

The suction pipe 20B extends obliquely upward from the first end 22B, and the end surface of the second end 23B opposite to the first end 22B extends upward. The angle formed by the extending direction of the suction pipe 20B and the direction G1 of gravity is, for example, 45 °. That is, the end face of the second end 23B is an end face cut at 45 ° with respect to the stretching direction of the suction pipe 20B. The spray pipes 30E and 30F extend along a plane perpendicular to the direction of gravity G1. Further, the spray pipes 30E and 30F are arranged with respect to the second end 23B in the same manner as the spray pipes 30C and 30D described above.

The second spray pipe 32 is arranged above the suction pipe 20B and the spray pipes 30E and 30F. The extension direction of the second spray pipe 32 is the same as the extension direction of the spray pipes 30E and 30F when viewed from the horizontal direction, as shown in the figure surrounded by the dotted line L5 in FIG. Further, the extending direction of the second spray pipe 32 is the same as the extending direction of the suction pipe 20B when viewed from above, as shown in the figure surrounded by the dotted line L6 in FIG.

The second spray pipe 32 extends toward the pipe T1 which is the object for discharging the molten metal M1. The spray port 33 of the second spray pipe 32 faces the pipe T1. As a result, the spread of the molten metal M1 can be suppressed, and the molten metal M1 can be sufficiently adhered to the pipe T1. As described above, in the configuration of the molten metal discharge device 1C, the molten metal M1 can be discharged from the lateral direction to the pipe T1. The lateral direction is a direction along a plane perpendicular to the direction of gravity G1.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

T1 tube (object)
1, 1A, 1B, 1C Molten metal discharge device 10 Melting tank 20, 20A, 20B Suction pipe 21, 21A Discharge port 22, 22A, 22B 1st end 23, 23A, 23B 2nd end 30A, 30B, 30C, 30D , 30E, 30F Spray pipe 31A, 31B, 31C, 31D Spray port 40 Load meter 50 Moving part 60 Control device 70 Heater (heating means)
100 Film forming device C1, C2 Rotating roller (rotating part)
D1 Direction from the 2nd end to the 1st end G1 Direction of gravity M1 Molten metal

Claims (8)

A melting tank for storing molten metal and
The molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank, and is exposed to the outside of the melting tank from the second end opposite to the first end. A suction pipe that guides the molten metal to the outside of the melting tank,
By blowing a gas toward the second end of the suction pipe, a negative pressure is generated in the vicinity of the second end to generate a suction force of the molten metal in the suction pipe, and the suction force is generated. A spray pipe for discharging the molten metal guided to the outside of the second end is provided.
The gas spray port in the spray pipe is arranged behind the discharge port when viewed from the side facing the discharge port of the molten metal formed at the second end, and the molten metal is transferred to the molten metal. A molten metal discharge device characterized by discharging upward with respect to a melting tank. A melting tank for storing molten metal and
The molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank, and is exposed to the outside of the melting tank from the second end opposite to the first end. A suction pipe that guides the molten metal to the outside of the melting tank,
By blowing a gas toward the second end of the suction pipe, a negative pressure is generated in the vicinity of the second end to generate a suction force of the molten metal in the suction pipe, and the suction force is generated. A spray pipe for discharging the molten metal guided to the outside of the second end is provided.
The molten metal discharge device is characterized in that the upper side, which is the side on which the suction pipe is inserted, is open. A melting tank for storing molten metal and
The molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank, and is exposed to the outside of the melting tank from the second end opposite to the first end. A suction pipe that guides the molten metal to the outside of the melting tank,
By blowing a gas toward the second end of the suction pipe, a negative pressure is generated in the vicinity of the second end to generate a suction force of the molten metal in the suction pipe, and the suction force is generated. A spray pipe for discharging the molten metal guided to the outside of the second end, and
A load meter for measuring the total weight of the molten metal and the molten tank stored in the melting tank, and
A moving portion that moves at least one of the melting tank, the suction pipe, and the blowing pipe in order to change the relative position of the melting tank with respect to the suction pipe and the blowing pipe.
A molten metal discharge device comprising: a control device for controlling the moving portion so that the amount of decrease in the total weight measured by the load meter per unit time falls within a predetermined range. Claims 1 to 3 are characterized in that the suction pipe is configured such that the direction from the second end to the first end of the suction pipe is the same as the direction of gravity. The molten metal discharge device according to any one of the above items. The molten metal discharge device according to any one of claims 1 to 4, further comprising a heating means for heating the suction pipe. A film forming device that forms a film on the outer surface of a tube as an object.
The rotating part that rotates the tube and
The molten metal discharge device according to any one of claims 1 to 5, which discharges the molten metal for forming the film on the outer surface of the pipe rotated by the rotating portion. A film forming apparatus characterized by. The process of storing molten metal in the melting tank and
The molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank, and is exposed to the outside of the melting tank from the second end opposite to the first end. A step of preparing a suction pipe for guiding the molten metal to the outside of the melting tank, and
By blowing gas toward the second end of the suction pipe using a spray pipe, a negative pressure is generated in the vicinity of the second end, and the suction force of the molten metal is generated in the suction pipe. This is a molten metal discharging method including a step of discharging the molten metal guided to the outside of the second end while generating the molten metal.
The gas spray port in the spray pipe is arranged behind the discharge port when viewed from the side facing the discharge port of the molten metal formed at the second end.
A method for discharging molten metal, which comprises discharging the molten metal upward with respect to the melting tank. The process of storing molten metal in a melting tank with an open upper part,
The molten metal is sucked up from the first end inserted into the molten metal stored in the melting tank, and is exposed to the outside of the melting tank from the second end opposite to the first end. A step of preparing by inserting a suction pipe for guiding the molten metal to the outside of the melting tank from above opened in the melting tank.
By blowing gas toward the second end of the suction pipe using a spray pipe, a negative pressure is generated in the vicinity of the second end, and the suction force of the molten metal is generated in the suction pipe. A molten metal discharging method comprising a step of discharging the molten metal guided to the outside of the second end while generating the molten metal.

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