JPH0575806B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for rapidly cooling and solidifying molten metal using a cooling drum in a closed space filled with an inert gas, etc.
This invention relates to an explosion-proof safety door that increases the safety of equipment for manufacturing metal foil or flakes.

[Conventional technology]

BACKGROUND ART The method of producing metal ribbon by rapidly solidifying molten metal has attracted attention for its advantages following the development of amorphous alloys, and is now in the spotlight as a means for developing new materials. This technology for producing metal ribbon using the rapid solidification method involves spraying a high-temperature molten material onto the outer surface of a cooling drum that is rotating at high speed and rapidly cooling it to produce an amorphous or near-crystalline material. . When using this technology, machining is difficult.
For example, ribbons of materials that cannot be cold rolled can be obtained directly from molten metal. Furthermore, it is possible to transform a high-temperature phase into an amorphous state at room temperature, which is impossible with ordinary cooling means.

On the other hand, as a technique for manufacturing Nd--Fe--B permanent magnets by the rapid solidification method, there are methods introduced in Japanese Patent Application Laid-Open Nos. 57-210934 and 60-9852. In addition, many similar methods have been reported as research results by universities, companies, etc. However, all of the conventional techniques are laboratory-scale, in which a small amount of the alloy is melted in a quartz crucible and rapidly solidified.

Therefore, the present inventors developed an apparatus having the equipment configuration shown in FIG. 3, and proposed a pouring container in Japanese Patent Application No. 333829/1983. In this device, the inside of the device main body 31 is divided into a melting chamber 32 and a flaking chamber 33, each of which is separated by a vacuum evacuation device 3.
Connected to 4. A melting container 36 equipped with a high-frequency coil 35 is tiltably arranged in the melting chamber 32 .

A bellows 38 is attached to a partition wall 37 that partitions the melting chamber 32 and the flaking chamber 33, and a funnel 39 and a pouring container 40 are attached to the bellows 38. An injection nozzle 41 is provided at the lower end of the pouring container 40, and a high-frequency coil 42 for maintaining the main body of the pouring container 40 and the injection nozzle 41 at a predetermined temperature is arranged around them.
In order to efficiently heat the pouring container 40 by the high frequency coil 42, a graphite block 43 is interposed between the pouring container 40 and the high frequency coil 42. In addition, a graphite block 43 and a high frequency coil 4
2, an outer crucible 45 is placed between the pouring container 40 and
support.

After melting a predetermined amount of Nd-Fe-B alloy raw material in the melting container 36, by tilting the melting container 36, the molten Nd alloy 44 is poured from the melting container 36 through the funnel 39 into the pouring container 40. Transfer to.
Note that the inside of the dissolution chamber 32 is opened or sealed by opening and closing the dissolution chamber door 46.

The molten metal 44 supplied to the pouring container 40 is sprayed onto the outer peripheral surface of the cooling drum 47 from the injection nozzle 41 located at the bottom of the pouring container 40 . The molten metal 44 forms a puddle 48 on the outer peripheral surface of the cooling drum 47,
The flakes 4 are removed by removing heat through the cooling drum 47.
Fly as 9. The flakes 49 are collected in a flake chamber 51 via a duct 50. In addition,
In order to uniformly cool the molten metal 44 by the cooling drum 47, a polishing roll 52 and a brush roll 53 are provided upstream of the position where the paddle 48 is formed.

The flakes 49 collected in the flake chamber 51 are
After removing the granulated iron, it is crushed to a predetermined size.
Becomes magnetic material.

[Problem to be solved by the invention]

When producing flakes or foil from molten metal in this way, the cooling drum 4 is used to rapidly cool and solidify the molten metal.
7 has a built-in water cooling mechanism, and a large amount of cooling water is circulated. Moreover, since various devices arranged inside the apparatus main body 31 are exposed to the heat dissipated from the molten metal, cooling water piping is incorporated inside to thermally protect these devices.
However, these drain pipes are subject to mechanical shock during internal work for manufacturing preparation, parts replacement, etc., or are subject to thermal fatigue, resulting in deterioration in mechanical strength.

If water leaks from this deteriorated drain pipe, there is a risk that the leaking cooling water will come into contact with hot molten metal and cause a steam explosion.

In addition, a large amount of molten metal may be poured onto the cooling drum 47 due to stoppage of the cooling drum 47 due to electrical or mechanical causes or leakage of the funnel 39 during injection, and the outer circumferential surface of the cooling drum 47 may be ground. There is also a risk that gold will accumulate and the cooling drum 47 will not be able to move. When pouring metal into such a cooling drum 47,
Alloying of Fe and Cu lowers the melting point of the circumferential surface of the cooling drum 47, causing it to be eroded by the molten metal, and furthermore, the molten metal enters the internal water cooling mechanism from the eroded area, causing a steam explosion. There is danger.

If a steam explosion were to occur, the internal pressure of the main body 31 of the apparatus would become extremely high, and the melting chamber door 46 would be blown away in an instant, causing a major accident. Therefore, it is necessary to carry out strict inspections of the drain pipes, but it is also necessary to take explosion-proof measures in case of an emergency.

Therefore, the present invention creates a slight gap between the door body and the tank wall when the internal pressure becomes abnormally high.
The purpose of the present invention is to provide an explosion-proof safety door that prevents accidents from occurring by releasing internal pressure from between them.

[Means to solve the problem]

In order to achieve its purpose, the explosion-proof safety door of the present invention uses an atmosphere-type ultra-quenching device that injects molten metal onto the circumferential surface of a cooling drum in a closed space to rapidly cool and solidify it to produce foil or flakes. A window provided in a tank wall forming an outer shell of the ultra-quench cooling device, a door body whose one end is attached to the window with a hinge and opens and closes in a single-opening manner, the other end of the door body, and the tank wall. a locking mechanism provided in a corresponding part of the lock arm, a lock arm provided in the door body or the tank wall and having a long hole extending in the opening/closing direction of the door body; and a lock arm inserted into the long hole of the lock arm; and a pin provided on the other tank wall or the door body.

[Function] In this explosion-proof safety door, the door body is fixed to a window portion formed in the tank wall by a hinge at one end and a locking mechanism at the other end. However, in order to facilitate the operation of opening and closing the window, the tightening force of the locking mechanism cannot be increased too much. Therefore, if the pressure inside the device becomes abnormally high, this internal pressure overcomes the tightening force of the locking mechanism and the locked state is released. Furthermore, an increase in internal pressure caused by a steam explosion or the like occurs instantaneously and becomes a force that blows away the door body.

Therefore, even when the locked state is released, a certain distance is maintained between the window part of the tank wall and the door body by the lock arm, and the high pressure gas inside is released. As a result, the pressure inside the device is reduced, and the door body and the like are prevented from flying off. At this time, the high pressure gas is
It is released to the side from the gap between the window and the door body,
It is not emitted in the front direction. Therefore, workers around the device are not exposed to high-temperature, high-pressure gas, ensuring safety.

〔Example〕

FIG. 1 shows a state in which a window 1 in the tank wall is closed with a door body 2. This door body 2 is attached to the window part 1 via a hinge 3 provided at one end.
It opens and closes in a single-sided manner with the center at the center. The other end of the door body 2 is provided with a locking mechanism 4 such as a shank vise or a manual tightening screw, and the door body 2 is fixed to the window portion 1 by the locking mechanism 4 in the closed state.

In the illustrated example, the locking mechanism 4 has a locking arm 6 pivotally supported by a locking protrusion 5 attached to the window 1, and a presser rod 7 inserted into the other end of the locking arm 6.
This presser rod 7 is provided with a male thread that engages with a female thread provided on the locking arm 6, and is moved forward and backward by turning the handle 8. Presser foot rod 7
The tip of the bar is a holding part 9, and when the holding rod 7 moves forward, this holding part 9 is pressed against the front surface of the door body 2. Thereby, the door body 2 is fixed to the window portion 1.

Furthermore, a safety mechanism 10 is provided on the locking mechanism 4 side of the door body 2. This safety mechanism 10 includes an L-shaped lock arm 13 that is attached to protrusions 11 and 12 attached to the window portion 1 and the door body 2. An elongated hole 14 extending in the opening/closing direction of the door body 2 is bored at the end of the lock arm 13. Then, the connecting pin 15 is placed overlapping the protrusion 11.
is inserted into the elongated hole 14 and the hole (not shown) of the protrusion 11. This connects the protrusion 11 and the lock arm 13. Further, the other end of the lock arm 13 is similarly overlapped with the protrusion 12, and a hole (not shown) is formed in the corresponding position of the other end of the lock arm 13 and the protrusion 12, respectively, with a connecting pin 16 passing through both. By inserting the protrusion 12 into the lock arm 13, the protrusion 12 and the lock arm 13 are connected.

In this way, the lock arm 1 is
3 is connected to the protrusion 11, the locking mechanism 4
When the locked state by
can be moved.

Next, the operation of the explosion-proof safety door of this embodiment will be specifically explained with reference to FIG.

When the internal pressure of the apparatus main body is in a normal state, the door main body 2 is brought into close contact with the window portion 1 by the tightening force of the locking mechanism 4, as shown in FIG. In this state,
A connecting pin 15 is located in front of a long hole 14 provided in the lock arm 13.

If the internal pressure of the device body increases abnormally for some reason, the locking state of the locking mechanism 4 may be released or the locking mechanism 4 itself may be destroyed. In this state, the door body 2 is not pressed against the edge of the window portion 1, and as shown in FIG. 2b, the door body 2 is pushed forward by the internal pressure. However, the movement of the door body 2 is restricted by the lock arm 13. That is, as the door body 2 moves forward, the connecting pin 15 slides in the long hole 14, but when it reaches the rear end of the long hole 14, the sliding movement of the connecting pin 15 is restricted.

At this time, there is a long hole 1 between the window part 1 and the door body 2.
A space 17 corresponding to the distance 4 is created, and the abnormally pressurized furnace gas 18 is discharged to the outside through this space 17. Due to this discharge of the furnace gas 18, the internal pressure is rapidly reduced, and no force is generated that would blow away the door body 2. In addition, the furnace gas 1
8 is discharged in the direction along the opening surface of the window 1, and the furnace gas 18 is no longer blown out forward from the window 1. Therefore, the high-temperature, high-pressure furnace gas 18 does not come into contact with workers around the device, resulting in high safety.

〔Effect of the invention〕

As explained above, in the present invention, by providing a safety mechanism that holds the door body with a slight gap between the window part and the door body,
When the internal pressure becomes abnormally high and the locked state is released, a method is adopted in which the gas inside the furnace is released from the gap between the window and the door body. This prevents the internal pressure from increasing further and prevents the door body and equipment placed inside from scattering to the surrounding area. Moreover, since the furnace gas is discharged to the side, the discharged furnace gas does not come into contact with workers around the equipment. In this way, according to the present invention, the safety of the atmospheric super-quenching device is enhanced.

[Brief explanation of the drawing]

Fig. 1 shows an explosion-proof safety door according to an embodiment of the present invention, Fig. 2 is a diagram for explaining its operation, and Fig. 3 is a diagram for explaining its operation.
The figure shows the entire apparatus for producing flakes from molten Nd alloy. 1: window, 2: door body, 3: hinge, 4: locking mechanism, 5: locking protrusion, 6: locking arm, 7: presser rod, 8: handle, 9: presser, 10: safety mechanism , 11, 12: protrusion, 13: lock arm, 1
4: Long hole, 15, 16: Connecting pin, 17: Between,
18: Furnace gas.

Claims (1)

[Claims] 1. In an atmosphere-type super-quenching device that injects molten metal onto the circumferential surface of a cooling drum in a sealed space to rapidly cool and solidify it to produce foil or flakes, it is installed on the tank wall that forms the outer shell of the ultra-quenching device. a window portion attached to the window portion with a hinge, a door body that opens and closes in a single-opening manner, a locking mechanism provided at the other end of the door body and a corresponding portion of the tank wall, and the door. A lock arm provided in the main body or the tank wall and having a long hole extending in the opening/closing direction of the door main body, and a lock arm inserted into the long hole of the lock arm and provided in the other tank wall or the door main body. An explosion-proof safety door for an atmosphere-type ultra-quenching device characterized by being equipped with a pin.