Molten-metal shutting-off mechanism in atomizer

Abstract

To provide a molten-metal shutting-off mechanism in an atomizer allowed to swiftly stop molten metal from outflowing in the atomizer.SOLUTION: The present invention provides a molten-metal shutting-off mechanism 10 in an atomizer 1, for producing a particulate by spraying high-pressure fluid to molten metal flowing out of a discharge nozzle 3 provided at a bottom 2a of a reservoir 2, the atomizer 1 having a discharge nozzle chamber 4 in which the discharge nozzle 3 is arranged and a spray-nozzle chamber 5 provided below a discharge spray-nozzle chamber 5 and for spraying high-pressure fluid to molten metal. The shutting-off mechanism 10 comprises a shutoff member 11 that is provided between the discharge nozzle chamber 4 and the spray-nozzle chamber 5 and to move between a retraction position retracted from between both chambers and a shutoff position lying between them. The shutoff member 11 is provided such that, when arranged in the shutoff position, shuts off between inside and outside of the discharge nozzle chamber 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a molten metal blocking mechanism in an atomizing device. [Background technology]

[0002] Machine parts such as oil-retaining bearings are manufactured by impregnating sintered metal obtained by sintering powder with lubricating oil. A method for manufacturing metal powder using an atomizing device is used as a method for manufacturing metal powder used in such sintered metal (see Patent Document 1). For example, in the manufacture of metal powder using a water atomizing device, metal powder (atomized powder) is manufactured by the following method. First, a metal liquid (hereinafter referred to as molten metal) in which a metal material is dissolved is supplied to a container (crucible) of the water atomizing device. A nozzle for discharging the molten metal is provided at the bottom of the crucible, and the molten metal is discharged from this nozzle, and high-pressure water is sprayed and collided with the molten metal that has been discharged. The molten metal that has been collided with the high-pressure water then becomes fine metal powder (atomized powder), and the metal powder can be obtained by collecting this metal powder together with water in a collection pot. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-273505 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the water atomizing device described above, if the nozzle provided on the crucible is damaged and more molten metal than expected flows out, the molten metal that flows out from the damaged nozzle may come into contact with water. If the molten metal comes into contact with water, a steam explosion may occur, so it is necessary to quickly stop the flow of the molten metal. However, at present, no device or mechanism has been developed to stop the flow of the molten metal in such a case, and there is a demand for a device or mechanism to quickly stop the flow of the molten metal.

[0005] SUMMARY OF THE PRESENT INVETION In view of the above circumstances, an object of the present invention is to provide a molten metal cutoff mechanism in an atomizing device that quickly stops the outflow of molten metal from an atomizing device. [Means for solving the problem]

[0006] The molten metal blocking mechanism in the atomization device of the first invention is a molten metal blocking mechanism in an atomization device that produces granular material by spraying a high-pressure fluid at molten metal flowing out from an exhaust nozzle provided at the bottom of a storage container, and the atomization device comprises an exhaust nozzle chamber in which the exhaust nozzle is arranged, and a spray nozzle chamber provided below the exhaust nozzle chamber and spraying high-pressure fluid at the molten metal, and the blocking mechanism comprises a blocking member provided between the exhaust nozzle chamber and the spray nozzle chamber and moves between a retracted position retracted from between the two and a blocking position located between the two, and the blocking member is configured to block between the inside of the exhaust nozzle chamber and the outside when positioned in the blocking position. The molten metal blocking mechanism in the atomization device of the second invention is characterized in that, in the first invention, the blocking member has a blocking portion located below the discharge nozzle chamber when the blocking member is positioned in the blocking position, and a communicating portion located below the discharge nozzle chamber when the blocking member is positioned in the retracted position, and the communicating portion has a through hole formed therein penetrating between the surface on the discharge nozzle chamber side and the surface on the spray nozzle chamber side. The molten metal blocking mechanism in the atomization device of the third invention is characterized in that, in the second invention, the blocking mechanism is equipped with a moving mechanism for moving the blocking member, and the operation of the moving mechanism is controlled so that the blocking member is normally placed in the retracted position, and when leakage of molten metal into the discharge nozzle chamber is detected, the blocking member is placed in the blocking position. The molten metal blocking mechanism in the atomization device of the fourth invention is characterized in that, in the first invention, the moving mechanism moves the blocking member linearly along a direction perpendicular to the axial direction of the discharge nozzle chamber, and the blocking member is arranged so that the communicating portion and the blocking portion are aligned along the movement direction of the blocking member. Effect of the Invention

[0007] According to the first and second aspects of the present invention, the inside of the discharge nozzle chamber can be kept sealed off from the outside by placing the blocking member in the blocking position, so the molten metal that flows out from the discharge nozzle can be retained in the discharge nozzle chamber. Then, if a certain amount or more of molten metal is retained in the discharge nozzle chamber, the molten metal cannot flow out of the discharge nozzle, so the outflow of molten metal can be stopped. According to the third aspect of the present invention, in the event that leakage of the molten metal occurs, the outflow of the molten metal can be stopped reliably. According to the fourth aspect of the present invention, the inside of the discharge nozzle chamber can be quickly sealed off from the outside by the blocking member. [Brief description of the drawings]

[0008] [Figure 1] 1A is a partially enlarged view of an atomizing device 1 of this embodiment provided with a molten metal blocking mechanism 10, and FIG. 1B is a schematic plan view of the molten metal blocking mechanism 10. FIG. [Diagram 2] (A) is a schematic diagram of the state in which the blocking member 11 is placed in the retracted position, (B) is a view taken along the line BB in (A), (C) is a schematic diagram of the state in which the blocking member 11 is placed in the blocking position, and (D) is a view taken along the line DD in (B). [Diagram 3]1 is a schematic explanatory diagram of an atomizing device 1 of the present embodiment provided with a molten metal blocking mechanism 10. FIG. [Figure 4] 1A is a schematic explanatory diagram of the state in which the blocking member 11B is placed in the retracted position, FIG. 1B is a schematic explanatory diagram of the state in which the blocking member 11B is placed in the blocking position, and FIG. 1C is a cross-sectional view taken along line CC in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The molten metal blocking mechanism in the atomizing device of this embodiment is a device that prevents leakage of molten metal in the atomizing device, and is characterized by being able to reliably and safely prevent leakage of molten metal.

[0010] The granular material produced by the atomizing device of the present embodiment is not particularly limited. For example, metal powders of alloys such as copper and tin can be mentioned. In the following, the granular material produced by the atomizing device of the present embodiment may be simply called metal powder.

[0011] In the following, the atomizing device of this embodiment will be described as a water atomizing device in which the fluid sprayed onto the molten metal is high-pressure water, but the structure of the atomizing device of this embodiment is not limited to water atomizing devices and can also be used in gas atomizing devices. In other words, the atomizing device of this embodiment can use high-pressure gas as the high-pressure fluid sprayed onto the molten metal.

[0012] <Atomization device 1> As shown in Figure 3, the atomization device 1 has a metal powder formation section 1a and a recovery section 1b which is a hollow structure. In the metal powder formation section 1a, metal powder is formed from molten metal (molten metal), and this metal powder and the water used in forming the metal powder are recovered in a recovery container 1c provided at the bottom of the recovery section 1b.

[0013] <Metal powder forming part 1a> As shown in FIG. 3, the metal powder forming section 1a is a section in which metal powder is formed from molten metal (molten metal), and is provided above the recovery section 1b.

[0014] <Storage container 2> 1(A), the metal powder forming unit 1a includes a storage container 2, such as a crucible, to which molten metal is supplied. The storage container 2 is a hollow container having a space therein for storing the molten metal, and has heat resistance so as not to be damaged even when high-temperature molten metal is supplied.

[0015] <Exhaust nozzle chamber 4> As shown in Fig. 1, a discharge nozzle chamber 4 is provided below the bottom 2a of the storage container 2. This discharge nozzle chamber 4 is a hollow cylindrical structure having openings at the upper and lower ends. This discharge nozzle chamber 4 is installed so that its upper end contacts the outer surface of the bottom 2a of the storage container 2 (i.e., the bottom surface of the storage container 2). In other words, the upper end of this discharge nozzle chamber 4 is provided so that the molten metal does not flow out from between the upper end and the bottom surface of the storage container 2.

[0016] Furthermore, the discharge nozzle chamber 4 is formed so that its lower edge is located on approximately the same horizontal plane. Note that "the lower edge of the discharge nozzle chamber 4 is located on approximately the same horizontal plane" includes both cases where the entire lower edge of the discharge nozzle chamber 4 is located on the same horizontal plane and cases where most of the lower edge of the discharge nozzle chamber 4 is located on the same horizontal plane. For example, cases where the lower edge of the discharge nozzle chamber 4 has slight irregularities or notches are also included in "the lower edge of the discharge nozzle chamber 4 is located on approximately the same horizontal plane."

[0017] The upper end of the discharge nozzle chamber 4 does not necessarily have to be provided so as to come into contact with the outer surface of the bottom 2a of the storage container 2. As long as the molten metal does not flow out from between the upper end of the discharge nozzle chamber 4 and the outer surface of the bottom 2a of the storage container 2, the discharge nozzle chamber 4 may be provided so as to have a small gap between them.

[0018] <Exhaust nozzle 3> As shown in Fig. 1, a discharge nozzle 3 is provided in a portion of the bottom 2a of the storage container 2 located inside the discharge nozzle chamber 4. This discharge nozzle 3 has openings at the upper and lower ends and is provided with a flow path (a flow path through which the molten metal flows) that communicates between the upper opening and the lower opening. In other words, the discharge nozzle 3 has a function of causing the molten metal in the storage container 2 to fall (flow down) downward by gravity, that is, into the discharge nozzle chamber 4.

[0019] <Spray nozzle chamber 5> As shown in FIG. 1, the spray nozzle chamber 5 is provided below the discharge nozzle chamber 4. The spray nozzle chamber 5 is a substantially cylindrical space having openings at the upper and lower ends. That is, the spray nozzle chamber 5 is a space provided such that its internal space communicates with the discharge nozzle chamber 4 through the opening at the upper end, and its internal space communicates with the recovery section 1b through the opening at the lower end. The spray nozzle chamber 5 is provided with a spray nozzle 5b that sprays high-pressure water. The spray nozzle 5b is provided so that it can discharge high-pressure water and spray this high-pressure water onto the molten metal supplied from the nozzle chamber 4. Therefore, when the molten metal flows into the spray nozzle chamber 5, the high-pressure water is sprayed onto the molten metal, so that metal powder can be formed, and the formed metal powder and water are supplied (dropped) from the spray nozzle chamber 5 to the recovery section 1b.

[0020] <Shut-off mechanism 10> 1, a blocking mechanism 10 is provided between the discharge nozzle chamber 4 and the spray nozzle chamber 5. The blocking mechanism 10 has a blocking member 11 and a moving mechanism 15 that moves the blocking member 11.

[0021] <Blocking member 11> As shown in Fig. 1(B), the blocking member 11 is a rectangular plate-like member in a plan view, and is arranged so that its upper surface, i.e., the surface facing the discharge nozzle chamber (hereinafter sometimes simply referred to as upper surface 11a), is horizontal (see Fig. 1(A)). This blocking member 11 is arranged so as to be movable along a direction perpendicular to the axial direction of the discharge nozzle chamber 4. In other words, the blocking member 11 is arranged so as to be movable along a substantially horizontal direction while maintaining its upper surface substantially horizontal.

[0022] This blocking member 11 is provided with a blocking portion 12 and a communicating portion 13 along its longitudinal direction. Specifically, the blocking member 11 is provided such that the communicating portion 13 is located on the discharge nozzle chamber 4 side, and the blocking portion 12 is located at a portion of the communicating portion 13 away from the discharge nozzle chamber 4.

[0023] The communication part 13 has a through hole 13h formed so as to communicate between its upper surface 11a and the surface on the spray nozzle chamber side (hereinafter, sometimes simply referred to as the lower surface 11b). This through hole 13h is formed in the same shape (or similar shape) as the opening at the lower end of the discharge nozzle chamber 4, and is formed so as to be approximately the same size as the opening at the lower end of the discharge nozzle chamber 4 or slightly smaller than the opening at the lower end of the discharge nozzle chamber 4 (see FIG. 2(B)). In other words, when the blocking member 11 is arranged so that the center 13p of the through hole 13h is located on the central axis of the discharge nozzle chamber 4, the opening at the lower end of the discharge nozzle chamber 4 is formed so as to overlap (match) with the through hole 13h when viewed from the top-bottom direction. The state in which the blocking member 11 is arranged so that the center of the through hole 13h is located on the central axis of the discharge nozzle chamber 4 corresponds to the state in which the blocking member 11 is arranged at the retracted position (see FIGS. 2(A) and (B)).

[0024] The blocking portion 12 is a portion that does not have a hole or the like that communicates between its upper surface 11a and its lower surface 11b. The blocking portion 12 is formed to be larger than the opening at the lower end of the discharge nozzle chamber 4 (see FIG. 2(D)). In other words, when the blocking member 11 is arranged so that the center of the blocking portion 12 is located on the central axis of the discharge nozzle chamber 4, the blocking portion 12 is formed so that it can completely cover the opening at the lower end of the discharge nozzle chamber 4 when viewed from below. The state in which the blocking member 11 is arranged so that the center of the blocking portion 12 is located on the central axis of the discharge nozzle chamber 4 corresponds to the state in which the blocking member 11 is arranged at the blocking position. The center of the blocking portion 12 is, for example, a point located on a line 11s (see FIG. 1(B)) that is parallel to the longitudinal direction of the blocking member 11 (in other words, the moving direction of the blocking member 11) and passes through the center of the through hole 13h.

[0025] <Movement mechanism 15> The moving mechanism 15 includes an air cylinder 16 and a control unit 17 that controls the operation of the air cylinder 16.

[0026] As shown in FIG. 1, the air cylinder 16 is provided so that its axial direction is horizontal, and its extension direction is parallel to the longitudinal direction of the blocking member 11. That is, the air cylinder 16 is provided so that when it extends or retracts, the blocking member 11 moves linearly along its longitudinal direction (in other words, the direction of the line 11s described above). Moreover, the air cylinder 16 is provided so that when it is contracted, the blocking member 11 is disposed at the retracted position, and when it is extended, the blocking member 11 is disposed at the blocking position. More specifically, when the air cylinder 16 is contracted, the communication portion 13 of the blocking member 11 is disposed below the discharge nozzle chamber 4 (see FIG. 2(A)), and when the air cylinder 16 is extended, the blocking portion 12 is disposed below the discharge nozzle chamber 4 (see FIG. 2(B)).

[0027] The operation of the air cylinder 16 is controlled by the control unit 17. Specifically, the control unit 17 controls the operation of the air cylinder 16 so that the blocking member 11 is normally held in a retracted position, and in an emergency, that is, when leakage of molten metal into the discharge nozzle chamber 4 is detected, the blocking member 11 is moved from the retracted position to the blocking position. The control unit 17 is provided with a sensor for determining leakage of molten metal, and controls the operation of the air cylinder 16 based on a signal from the sensor. The method of detecting leakage of molten metal using a sensor is not particularly limited. For example, a temperature sensor is provided in the discharge nozzle chamber 4 or the recovery unit 1b, and when the temperature detected by the temperature sensor (for example, the temperature of the gas in the discharge nozzle chamber 4, the temperature of the nozzle chamber 4 itself, the temperature of the inner wall of the recovery unit 1b, etc.) reaches or exceeds a certain temperature, it can be determined that leakage of molten metal has occurred.

[0028] Since the blocking mechanism 10 has the above-mentioned configuration, under normal circumstances, the control unit 17 maintains the air cylinder 16 in a contracted state, so that the communication part 13 of the blocking member 11 of the blocking mechanism 10 is positioned below the discharge nozzle chamber 4. In this state, the molten metal dropping from the discharge nozzle 3 can drop from the discharge nozzle chamber 4 through the through hole 13h of the communication part 13 of the blocking member 11 into the spray nozzle chamber 5. Then, when high-pressure water ejected from the spray nozzle 5b is sprayed onto the molten metal in the spray nozzle chamber 5, metal powder can be produced.

[0029] In addition, when the molten metal leaks into the discharge nozzle chamber 4 due to damage to the discharge nozzle 3 or the like and the control unit 17 determines that the molten metal has leaked, the control unit 17 operates the air cylinder 16 to extend. Then, the blocking member 11 moves linearly and the blocking part 12 is disposed below the discharge nozzle chamber 4. When the blocking part 12 is disposed below the discharge nozzle chamber 4, the opening at the lower end of the discharge nozzle chamber 4 is blocked by the blocking part 12, so that the molten metal that has fallen from the discharge nozzle 3 is held in the space surrounded by the blocking part 12 of the blocking member 11, the discharge nozzle chamber 4, and the bottom part 2a of the storage container 2, that is, in the discharge nozzle chamber 4. When the molten metal accumulates in the discharge nozzle chamber 4, the molten metal cannot fall from the discharge nozzle 3 into the discharge nozzle chamber 4, and the fall of the molten metal from the discharge nozzle 3 eventually stops. In other words, the fall of the molten metal can be stopped.

[0030] As described above, by providing the molten metal blocking mechanism 10 in the atomization device 1 of this embodiment, under normal circumstances, metal powder can be generated from the molten metal falling from the discharge nozzle 3, just as when the blocking mechanism 10 is not provided. In an emergency when it is necessary to stop the fall of the molten metal, the blocking member 11 of the blocking mechanism 10 can block the fall of the molten metal from the discharge nozzle chamber 4 to the spray nozzle chamber 5. Moreover, since the molten metal can be stopped from falling from the discharge nozzle 3 by storing the molten metal in the discharge nozzle chamber 4, the atomizing device 1 can be stopped safely and quickly in an emergency.

[0031] <Regarding the blocking member 11> When the blocking member 11 is placed in the retracted position, the center 13p of the through hole 13h may be slightly offset from the central axis of the discharge nozzle chamber 4. It is only necessary that the through hole 13h is positioned so as not to interfere with the fall of the molten metal that has fallen from the discharge nozzle 3 into the discharge nozzle chamber 4 (i.e., the blocking member 11 does not come into contact with the molten metal) when the blocking member 11 is placed in the retracted position.

[0032] The size and shape of through hole 13h do not necessarily have to be the same as the size and shape of the opening at the lower end of discharge nozzle chamber 4. In other words, through hole 13h may be smaller than or have a different shape than the opening at the lower end of discharge nozzle chamber 4. It is sufficient that through hole 13h is formed so as not to interfere with the fall of molten metal that has fallen from the discharge nozzle 3 into discharge nozzle chamber 4 (i.e., shielding member 11 does not come into contact with molten metal) when shielding member 11 is placed in the retracted position.

[0033] When the blocking member 11 is placed in the blocking position, the center 12p of the blocking portion 12 may be slightly offset from the central axis of the discharge nozzle chamber 4. It is only necessary that the blocking portion 12 is positioned so that it can block the opening at the lower end of the discharge nozzle chamber 4 when the blocking member 11 is placed in the blocking position.

[0034] The upper surface 11a of the blocking member 11 does not necessarily have to be provided so as to come into contact with the lower edge of the discharge nozzle chamber 4. As long as the molten metal can be stored within the discharge nozzle chamber 4 without flowing out from between the upper surface 11a of the blocking member 11 and the lower edge of the discharge nozzle chamber 4, the blocking member 11 may be provided so that there is a small gap between its upper surface 11a and the lower edge of the discharge nozzle chamber 4.

[0035] In the above example, a case has been described in which the blocking member 11 has the blocking portion 12 and the communication portion 13. With this configuration, the upper surface 11a of the blocking member 11 is always in contact with the lower edge of the discharge nozzle chamber 4 (or the upper surface 11a of the blocking member 11 is always located below the lower edge of the discharge nozzle chamber 4). As a result, when the blocking member 11 moves, the lower edge of the discharge nozzle chamber 4 can function as a surface that guides the movement of the blocking member 11, which provides the advantage that the blocking member 11 can be stably moved between the retracted position and the blocking position.

[0036] On the other hand, a plate material without a through hole may be used as the blocking member, and this blocking member may be moved between a position below the discharge nozzle chamber 4 (i.e., blocking position) and a retracted position retracted from the position below the discharge nozzle chamber 4. For example, as shown in FIG. 4, a blocking member 11B consisting of only the blocking portion 12 of the blocking member 11 described above may be moved between the blocking position and the retracted position. In this case, in order to stabilize the movement of the blocking member 11B, a guide member 11g that guides the movement of the blocking member 11B may be provided (see FIG. 4(C)). Of course, even when a blocking member 11 having a blocking portion 12 and a communicating portion 13 is provided, a guide member having a structure equivalent to or similar to the guide member 11g that guides the movement of the blocking member 11 may be provided.

[0037] <About the exhaust nozzle chamber 4> 1 to 3, the discharge nozzle chamber 4 is shown as having a structure with a narrow diameter portion 4a at the top and an expanded diameter portion 4b at the bottom, that is, as a stepped cylinder, but the discharge nozzle chamber 4 does not necessarily have to be a stepped cylinder and may have the same diameter as a whole (see FIG. 4). However, if the discharge nozzle chamber 4 is a stepped cylinder having a narrow diameter portion 4a and an expanded diameter portion 4b, the flow of molten metal flowing out of the discharge nozzle 3 can be stabilized. In other words, it is possible to prevent problems such as the molten metal flowing out of the discharge nozzle 3 being shaken by the influence of the airflow generated by the high-pressure water sprayed onto the molten metal in the spray nozzle chamber 5, and the formation of metal powder can be stabilized.

[0038] Furthermore, when a structure having a narrow diameter portion and an expanded diameter portion is adopted for the discharge nozzle chamber 4, the narrow diameter portion and the expanded diameter portion may be integrated, or the narrow diameter portion and the expanded diameter portion may be separate. When the narrow diameter portion and the expanded diameter portion are separate, it is desirable to provide a seal member or the like between the lower end of the narrow diameter portion and the upper end of the expanded diameter portion to prevent the molten metal from flowing out or the outside air from flowing in between the two.

[0039] <About the moving mechanism 15> In the above example, the air cylinder 16 is used as the mechanism for moving the blocking member 11 in the moving mechanism 15, but the mechanism for moving the blocking member 11 is not particularly limited. For example, it is possible to adopt a mechanism for moving the blocking member 11 in the horizontal direction using the magnetic force of an electromagnet or a motor. However, using the air cylinder 16 has the advantage that it can be operated during a power outage and can be made relatively small.

[0040] In the above example, the blocking member 11 is linearly moved along the long axis between the retracted position and the blocking position, but the blocking member 11 is not necessarily limited to a configuration in which it moves linearly. For example, the blocking member 11 may be moved between the retracted position and the blocking position by swinging or rotating. However, if the blocking member 11 is moved linearly, even if there is a foreign object on the movement path of the blocking member 11, the blocking member 11 can be pushed aside and moved.

[0041] Emergency situations in which the supply of molten metal to the spray nozzle chamber 5 must be stopped are not limited to leakage of molten metal from the discharge nozzle 3 as in the above example. An example of an emergency in which the supply of molten metal to the spray nozzle chamber 5 must be stopped is when the storage container 2 breaks and molten metal leaks. In such an emergency, for example, a temperature sensor can be installed at the bottom of the storage container 2 to detect leakage based on the temperature. [Industrial Applicability]

[0042] The molten metal blocking mechanism in the atomizing device of the present invention is suitable as a mechanism for blocking the outflow of molten metal in the atomizing device. [Explanation of symbols]

[0043] 1 Atomization device 2. Storage Container 2a bottom 3 Discharge nozzle 4. Discharge nozzle chamber 5. Spray nozzle chamber 10. Shutoff Mechanism 11 Blocking member 12 Breaking section 13 Communication section 13h through hole 15 Moving mechanism 15 Moving mechanism 16 Air Cylinder 17 Control section

Claims

1. A molten metal blocking mechanism in an atomizing device for producing granular material by spraying a high-pressure fluid onto molten metal flowing out of a discharge nozzle provided at the bottom of a storage container, comprising: The atomizing device is an exhaust nozzle chamber in which the exhaust nozzle is disposed; a spray nozzle chamber provided below the discharge nozzle chamber and spraying a high-pressure fluid onto the molten metal, The blocking mechanism includes: a blocking member provided between the discharge nozzle chamber and the spray nozzle chamber and movable between a retracted position where the blocking member is retracted from the discharge nozzle chamber and a blocking position where the blocking member is located between the discharge nozzle chamber and the spray nozzle chamber; The blocking member is When the nozzle is disposed at the blocking position, the nozzle is provided so as to block communication between the inside of the discharge nozzle chamber and the outside. A molten metal blocking mechanism in an atomizing device.

2. The blocking member is a blocking portion located below the discharge nozzle chamber when the blocking member is disposed at the blocking position; a communication portion located below the discharge nozzle chamber when the blocking member is located at the retracted position, The communication portion has: A through hole is formed penetrating the surface on the discharge nozzle chamber side and the surface on the spray nozzle chamber side.

2. The molten metal blocking mechanism in an atomizing device according to claim 1, wherein the molten metal blocking mechanism is a metal atomizer.

3. The blocking mechanism includes: A moving mechanism for moving the blocking member is provided, The moving mechanism includes: The blocking member is normally placed in the retracted position, and the operation is controlled so that the blocking member is placed in the blocking position when leakage of molten metal into the discharge nozzle chamber is detected.

3. A molten metal blocking mechanism in an atomizing device according to claim 2.

4. The moving mechanism includes: The blocking member is moved linearly along a direction perpendicular to an axial direction of the discharge nozzle chamber, The blocking member is The communication portion and the blocking portion are arranged to be aligned along the moving direction of the blocking member.

4. A molten metal blocking mechanism in an atomizing device according to claim 2 or 3.

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