JP2598572Y2 - Ladle for ductile cast iron - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladle used for spheroidizing molten iron for ductile cast iron, and particularly to a large amount of ladle generated when a molten metal for ductile cast iron reacts with a predetermined spheroidizing agent inside a ladle body. The present invention relates to a ladle for ductile cast iron in which the emission of white smoke, gas, dust, etc. to the outside can be more efficiently prevented, and the effect of preventing such white smoke, gas, etc. from being emitted can be maintained for a long time. It is.

[0002]

2. Description of the Related Art Conventionally, ductile iron has been known as having both high strength and excellent formability, and is used as a material for water pipes, vehicle parts, and the like. And, in general, this ductile cast iron material is subjected to a predetermined spheroidizing treatment on a molten metal giving the cast iron material in a manufacturing process, whereby graphite, which is a main constituent structure thereof, is spheroidized, Thus, the excellent characteristics as described above are provided.

As one of the techniques for performing the spheroidizing treatment of the molten iron for ductile cast iron, a spheroidizing method in a ladle is known. Of the spheroidizing agent, for example, magnesium and the like, and thereafter, the molten metal for ductile cast iron is supplied into the molten metal accommodating portion, whereby the spheroidizing agent and the molten metal are brought into contact with each other and reacted. According to such a method, the spheroidizing treatment of the molten iron for ductile cast iron can be performed relatively easily, but on the other hand, a large amount of white smoke, gas, dust, Further, intense flashes were inevitably generated, which significantly deteriorated the environment in the workplace and also had a bad influence on workers.

[0004] Therefore, various proposals have hitherto been made to solve the problems associated with the generation of white smoke, gas, dust and flash in the spheroidizing treatment of the molten metal for ductile cast iron. For example, JP-A-4-158972 and JP-A-4-158973 disclose a ladle used for spheroidizing a molten metal for ductile cast iron, in which a cover is attached to an upper opening of a main body of the ladle. A structure having a heat-resistant filter made of a porous material having continuous pores is disclosed. In these ladles, the inside of the ladle body is shielded from the outside by such a cover, so that the emission of flash light from the inside of the body can be prevented, and the ladle is provided on the cover. The fine particles in the exhaust gas emitted through the porous heat-resistant filter are trapped, and the emission of white smoke, dust and gas to the outside can be suppressed. In addition, in the ladles disclosed in these publications, different measures have been taken so that the effect of preventing emission of flash, white smoke, gas and the like can be further enhanced. That is, in the former case, a spherical ball having a specific gravity smaller than that of the molten metal is seated on the molten metal injection hole provided in the ladle cover, and a flash, white smoke, gas, etc. from the injection hole is formed. Leakage can be prevented or suppressed, and in the latter, a heat-resistant filter is formed by stacking and arranging a plurality of porous bodies through a hollow portion, and the fine particles in the exhaust gas are reduced. The capture efficiency could be further improved.

However, in each of the ladles disclosed in these publications, a heat-resistant filter made of a porous material is installed on a ladle cover as a lid for closing an upper opening of the ladle body. Therefore, it is difficult to secure the volume of the porous body that can sufficiently capture the fine particles in the exhaust gas. In the prevention of release, it has been difficult to obtain an effect sufficiently satisfactory for practical use. In addition, by increasing the thickness of the lid, it is easy to increase the thickness of the porous body constituting the heat-resistant filter, and to increase the volume of the porous body.
In this case, the size of the lid increases, and the handleability thereof is significantly deteriorated, which is not practical.

Further, as is well known, the molten metal for ductile cast iron reacts violently with a predetermined spheroidizing agent, so that the molten metal is scattered during the reaction. Therefore, in the ladle having the above-described structure, the heat-resistant filter installed on the ladle cover is damaged or clogged by the molten metal scattered during the reaction between the molten metal and the spheroidizing agent. There was also fear.

[0007]

Here, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an exhaust gas generated during a reaction between a predetermined spheroidizing agent and a molten metal. It is an object of the present invention to provide a ladle for ductile cast iron in which fine particles can be trapped more efficiently, and the emission of white smoke, dust, and gas from the inside of the ladle body to the outside can be more effectively prevented. Further, in the present invention, the heat-resistant filter for trapping the fine particles in the exhaust gas can be effectively prevented from being damaged or clogged by the molten metal scattered during the reaction. Providing a pot is also a solution.

[0008]

According to the present invention, in order to solve the above-mentioned problem, a predetermined spheroidizing agent disposed in a molten metal storage portion of a ladle main body having an open upper portion is provided with the molten metal storage. Contact the molten iron for ductile cast iron supplied to the
By causing the molten iron for ductile cast iron to be spheroidized by reacting, while attaching a lid to the upper opening of the ladle main body so as to openably close the opening, A window portion for exhausting white smoke, gas, etc. generated in the molten metal accommodating portion is provided on a side wall portion above the surface of the molten metal for ductile cast iron, and the window is further provided on an outer surface of the side wall portion. A smoke removal chamber through which white smoke, gas, and the like from the molten metal storage section inside the main body guided through the section is circulated, and a heat resistant filter made of a porous body is arranged inside the smoke removal chamber, A heat-resistant first partition member extending from one side facing the other to the other side in an exhaust space formed between the heat-resistant filter and the molten metal storage section inside the main body, and the one side from the other side. Heat-resistant second partition extending to the side of The material and the ladle for ductile cast iron having a bent path formed by alternately arranging them so as to overlap each other at a predetermined length in a position separated by a predetermined distance in a flow direction of exhaust gas in the exhaust space, This is the feature.

[0009]

In the ladle for ductile cast iron according to the present invention, the lid is attached to the upper opening of the ladle body, while the window is provided on the side wall of the ladle. White smoke, dust, and gas are introduced through the window, and a smoke removal chamber through which a heat-resistant filter made of a porous material is installed is installed inside. With the increase of the internal pressure in the molten metal storage section, the white smoke, gas and the like are circulated through the window from the molten metal storage section through the window, and further passed through the heat resistant filter in the degas chamber to the outside. The exhaust chamber is capable of being discharged, and furthermore, since the exhaust chamber, which is the flow passage of such exhaust gas, is installed on the outer surface of the side wall of the ladle main body, the exhaust chamber is subject to any restrictions. Without
It can be installed with a larger volume in conformity with the outer surface of the side wall of the main body, whereby the volume of the heat resistant filter disposed in the degassing chamber can be advantageously increased, and as a result, With such a heat-resistant filter, the fine particles in the exhaust gas can be trapped more efficiently.

[0010] In the ladle for ductile cast iron, an exhaust space is formed between the heat-resistant filter and the molten metal accommodating portion in the smoke-removing chamber as an exhaust passage, and the exhaust space faces each other in the exhaust space. The heat-resistant first and second partition members extending in the direction are arranged alternately so as to overlap with each other by a predetermined length in a state of being separated by a predetermined distance in a flow direction of the exhaust gas in the exhaust space, and the winding path is provided. Is formed, during the reaction between the predetermined spheroidizing agent and the molten metal, white smoke, dust, and gas are circulated in the exhaust space along such a curved path, and are favorably introduced into the heat resistant filter. On the other hand, the molten metal that is scattered is blocked by the first and second partition members in such a curved path, and is effectively prevented from reaching the heat-resistant filter arrangement portion. Than is obtained.

Therefore, in the ladle for ductile cast iron according to the present invention, the emission of white smoke, dust and gas generated during the reaction between the predetermined spheroidizing agent and the molten metal from the inside of the ladle body to the outside. Thus, it is possible to more effectively prevent the situation, whereby the working environment can be effectively improved, and the adverse effect on the worker can be advantageously eliminated. In addition, in such a ladle for ductile cast iron, the molten metal that is scattered during the reaction with the predetermined spheroidizing agent can effectively prevent the heat-resistant filter from being damaged or clogged. The service life of the filter can be advantageously prolonged, whereby the effect of preventing the emission of white smoke, dust, and gas to the outside can be maintained for a longer period of time.

In this ladle for ductile cast iron, the lid for closing the upper opening of the ladle main body is openably and closably mounted. The supply and removal of the molten metal before and after the spheroidizing process can be carried out with good workability, while the closed state allows the opening to be exposed to the flash or the scattered molten metal generated during the reaction between the predetermined spheroidizing agent and the molten metal. Can be effectively prevented from leaking out, and the carrying work and the like at that time can be performed safely.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to clarify the present invention more specifically, some embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 are schematic views specifically illustrating an example of a ladle for ductile cast iron having a structure according to the present invention. In these figures, reference numeral 10 denotes a ladle main body, which has a side wall portion 11 and a bottom wall portion 12, and has a substantially bottomed cylindrical shape as a whole. Further, the main body 10 is lined with a refractory material 13 such as an alumina brick having a predetermined thickness, and the outer side thereof is covered with an iron shell 14, as in the conventional case.

The interior of the main body 10 is a molten metal accommodating section 16 for accommodating the molten iron for ductile cast iron, and a predetermined spheroidizing agent such as magnesium is disposed at the bottom thereof. The reaction chamber 18 is
The same refractory material as that of the main body 10 is provided along the inner peripheral surface of the molten metal container 16. Reference numeral 19 denotes a take-out port for taking out the molten metal accommodated in the molten metal accommodating portion 16, and is provided at an upper end portion of the side wall portion 11 on a side radially opposed to the reaction chamber 18. .

On the other hand, the upper opening of the main body 10 is provided with a lid 2.
0 is attached. The lid 20 also has a structure similar to that of the main body 10, and is formed by covering an outer surface of a refractory material 13 as an inner lining with an iron shell 14. The lid 20 has a diameter and a wall thickness substantially the same as those of the upper opening of the main body 10 and is mounted on the opening. Thus, the upper opening of the main body 10 is closed and opened by the lid 20 so that the inside of the molten metal housing 16 of the main body 10 can be substantially sealed in the closed state. ing.

Further, as is apparent from FIG.
In the upper end portion of the side wall portion 0, the side wall portion 11 is positioned at both sides of the reaction chamber 18 in a planar form, that is, the side wall portion 11 on the side radially opposed to the outlet 19. Windows 22 are provided to pass through and open to the outside. In addition, the lower ends of the windows 22 are formed so as to be located a predetermined dimension above the surface of the molten metal accommodated in the molten metal accommodating portion 16 of the main body 10. Thereby, when the molten metal is stored in the molten metal storage portion 16 or when the molten metal is taken out from the outlet 19 by tilting the main body 10, the molten metal leaks out of the windows 22, 22. Can be avoided.

Further, on the outer surface of the side wall portion 11 of the main body 10, there are provided smoke removing chambers 24, 24. More specifically, as is apparent from FIG. 1, the smoke removing chamber 24 is provided with two ducts 26 and 28 made of the same material as the steel shell 14.
Are arranged along the outer surface of the side wall 11 with a length from the portion where the window 22 is formed in the side wall 11 of the main body 10 to the lower end thereof in the direction perpendicular to the axis. I have. Of the two ducts, the inner duct 26 located inside is opened at the upper end toward the window 22, while the outer duct 28 arranged outside is positioned at the upper end. The two ducts 26 and 28 are communicated with each other by a through hole 32 at the lower end thereof.

Each of the smoke removing chambers 2 having the above-described structure is used.
4, a first heat-resistant filter 34 and a second heat-resistant filter 36 are disposed inside the inner duct 26 and the outer duct 28, respectively. The two heat-resistant filters 34 and 36 are formed of a porous body made of a predetermined ceramic material and having continuous pores therein, so that a fluid can pass through the inside. . In the first and second heat resistant filters 34 and 36, the pore diameters of the pores are different from each other, and the former has a larger pore diameter. The first heat-resistant filter 34 and the second heat-resistant filter 36 have a length that is shorter than the inner duct 26 and the outer duct 28 of the smoke removal chamber 24 by a predetermined dimension, and are formed inside the two ducts 26 and 28. It is filled and arranged in the middle part, respectively.

Thus, in such a smoke removal chamber 24,
During the spheroidizing process of the ductile cast iron melt, which will be described later, exhaust such as white smoke, dust, and gas generated in the melt accommodating portion 16 of the main body 10 and guided through the window portion 22 is circulated through the inside thereof. And the second heat-resistant filter 34,
After passing through the inside 36, the air is discharged to the outside from the exhaust port 30.

In the flow path of the exhaust gas, a window is provided between the molten metal container 16 of the main body 10 and the first heat resistant filter 34 disposed in the inner duct 26 of the smoke removing chamber 24. 22 and the inner duct 26 of the smoke removal chamber 24
, An exhaust space 38 is formed. In the exhaust space 38, a plurality (three in this case) of heat-resistant blades 40 made of a flat steel material having heat resistance are arranged.

As is clear from FIGS. 2 and 3, the plurality of heat-resistant blades 40 are provided in the exhaust hole 38 in the exhaust hole 38 in the inner direction of the window 22 in the exhaust space 38 (FIG. 3).
(Center, left and right directions) at a predetermined distance from each other. Further, each of the heat-resistant blades 40 has a height lower than the height of the window 22 by a predetermined dimension and higher than a half height of the window 22 by a predetermined dimension, and a width substantially equal to the width of the window 22. ,It is configured. Then, such heat-resistant blades 40 are arranged so as to be fitted into the inner holes of the window portion 22, respectively. Of those, those arranged inside and outside are the upper end surfaces thereof. On the lower end surface of the iron cover 14 that covers the upper part of the window portion 22, and in the middle, the lower end surface is integrally joined to the lower end surface of the window portion 22, respectively. That is, the heat-resistant blades 40, 40 arranged on the inner side and the outer side extend a predetermined dimension vertically downward from the upper end side of the window 22 so as to close the upper side of the inner hole of the window 22 by a predetermined height. On the other hand, a predetermined heat-resistant blade 40 is disposed upward and vertically from the lower end of the window 22 so that the lower side of the inner hole of the window 22 is closed at a predetermined height. It is formed to extend in size.

Thus, the heat-resistant blades 40 are alternately arranged in the inner hole of the window portion 22 so as to overlap with each other by a predetermined length in the height direction at a predetermined interval in the flow direction of the exhaust gas. Accordingly, the exhaust gas from the molten metal storage portion 16 of the main body 10 bends and flows into the exhaust space 38 formed by the inner hole of the window portion 22 and the upper end space portion of the smoke removing chamber 24. Thus, a bent path 42 is formed. As is clear from this, in the present embodiment, the first and second partition members are constituted by the plurality of heat-resistant blades 40.

As described above, in the ladle for ductile cast iron having the above-described structure, first, a spheroidizing agent such as magnesium is placed in a reaction chamber 18 provided at the bottom of the molten metal accommodating portion 16 of the main body 10. Then, the molten metal for ductile cast iron is gradually supplied into the molten metal accommodating portion 16 toward the inside of the reaction chamber 18 so that the molten metal contacts and reacts with the spheroidizing agent to form a spheroid. In addition, white smoke, dust, and gas generated at that time are generated from the molten metal container 16 through the window as the internal pressure in the main body 10 closed by the lid 20 increases. It is guided into the degassing chambers 24, 24 through the parts 22, 22, and
After being passed through the first and second heat-resistant filters 34 and 36 disposed in each of the smoke removal chambers 24 and then filtered, and then discharged from the exhaust port 30 to the outside. It becomes.

In particular, in the ladle for ductile cast iron according to the present embodiment, each of the smoke removal chambers 24, which are the passages for the white smoke, dust, and gas, includes the inner duct 26 and the outer duct 28.
Are overlapped with each other in the direction perpendicular to the axis, and the ducts 26 and 28 are filled with the first and second heat-resistant filters 34 and 36, respectively. 11 is installed so as to extend in the height direction in accordance with the outer surface of the heat-resistant filter, compared to a conventional ladle for ductile cast iron in which a heat-resistant filter is disposed on the lid. The ratio of channel length to volume and channel cross-section can both be dramatically increased, and such first and second heat resistant filters 34,
When passing through the exhaust gas 36, fine particles and the like in the exhaust gas can be more efficiently captured, whereby harmful white smoke, dust, and gas can be more effectively prevented from being released to the outside.
As a result, adverse effects on the environment and workers in the workplace due to the exhaust gas discharged through the exhaust port 30 can be further reduced.

In the ladle for ductile cast iron, the inside of each window 22 for guiding exhaust of white smoke, dust, gas, etc. from the molten metal accommodating section 16 of the main body 10 to each of the smoke removing chambers 24. A plurality of heat-resistant blades 40 are disposed so as to overlap with each other at a predetermined length in a flow direction of the exhaust gas and at a predetermined length. Since the bent path 42 is formed in the exhaust space 38 formed between the first heat-resistant filter 34 and the first heat-resistant filter 34, only white smoke, dust and gas are generated during the reaction between the spheroidizing agent and the molten metal. While being able to be led into the smoke chamber 24 through the winding path 42, the scattered molten metal can be effectively shut off by the plurality of heat-resistant blades 40 and the smoke chamber 2
Contact with the first and second heat-resistant filters 34, 36 in 4 can be advantageously prevented. Thus, it is possible to effectively damage or clog the two heat-resistant filters 34 and 36, particularly the first heat-resistant filter 34 disposed on the upstream side in the exhaust gas flow direction, by the molten metal. Can be prevented, so that
The service life of the two heat resistant filters 34, 36 can be advantageously extended, and the effect of capturing the particulates in the exhaust gas by the first and second heat resistant filters 34, 36 can be maintained better for a longer period. Can be done.

Moreover, in the ladle for ductile cast iron according to the present embodiment, the plurality of heat-resistant blades 40 are arranged in the inner hole of the window 22 at the most upstream side in the exhaust gas flow direction. Is formed so as to extend downward from the upper end of the window 22 while being joined to the steel cover 14 covering the upper portion of the window 22, while being disposed downstream thereof. The window 22 is joined to the lower end surface of the window 22.
Since it is installed so as to extend upward from the lower end side, it is scattered during the reaction with the spheroidizing agent, and the molten metal adhered to the heat-resistant blades 40 is removed from the heat-resistant blades 40 through the window 22. Smoke removal chamber 24 along the lower end
Intrusion into the inside can be effectively prevented.

Further, in the ladle for ductile cast iron, in the first and second heat-resistant filters 34 and 36 disposed in the smoke removing chamber 24, the first and second heat-resistant filters 34 and 36 disposed downstream in the exhaust gas flow direction. Since the second heat-resistant filter 36 is formed of a porous body having a smaller pore diameter than the first heat-resistant filter 34 disposed on the upstream side, the second heat-resistant filter 36 can be captured by the first heat-resistant filter 34. Very fine particles in the exhaust can also be captured by the second heat-resistant filter 36,
The exhaust gas can be released to the outside in a cleaner state.

Furthermore, in the ladle for ductile cast iron according to the present embodiment, two windows 22 are provided at the upper end of the side wall 11 of the main body 10, and the windows 22 are correspondingly provided.
Are installed at two places on the outer surface of the main body 10, the heat-resistant filters 34 and 36 disposed in the degassing chamber 24 can be arranged in a state of being dispersed on the outer surface of the main body 10, and the Without increasing the size of the filter 24, the total volume of the two heat resistant filters 34 and 36 can be advantageously increased, so that a large amount of white smoke, dust,
The gas can be more efficiently purified, and the ladle main body 10 can be effectively prevented from being enlarged due to the installation of the smoke removing chamber 24.

Further, in this ladle for ductile cast iron, a lid 20 which can be freely opened and closed is attached to the upper opening of the main body 10, and the lid 20 allows the molten metal accommodating section of the main body 10. 16 can be closed so as to be in a substantially sealed state.
Leakage from the upper opening of the ladle can be advantageously prevented, so that the ladle can be transported safely.

Next, FIGS. 4 to 7 show schematic views of a ladle for ductile cast iron as another embodiment of the present invention. Here, the present embodiment shows another embodiment relating to the structure of the smoke removal chamber and the heat resistant filter disposed in the smoke removal chamber with respect to the ladle for the ductile cast iron shown in the first embodiment. Things. Therefore, in the ladle for ductile cast iron of the present embodiment, the same structure as that of the first embodiment is adopted for the parts other than the structure of the smoke removing chamber and the heat resistant filter. Therefore, FIGS.
In the drawings, members and portions having the same structure as in the first embodiment are denoted by the same reference numerals as those in the first embodiment in the drawings, and detailed description thereof is omitted. I do.

That is, as shown in FIGS. 4 and 5, in the ladle for ductile cast iron according to the present embodiment, the upper end of the side wall 11 of the ladle main body 10 has the side wall 1.
1 is provided with one window part 22 which opens to the outside through 1. Also, in the inner hole of the window portion 22, three heat-resistant blades 40 are provided at predetermined intervals in the flow direction of exhaust gas and upward or downward, respectively, as in the first embodiment. And are arranged alternately so as to extend and overlap by a predetermined length, whereby
Are formed.

On the other hand, as is apparent from FIG. 6, the outer surface of the side wall 11 of the main body 10 covers the window 22 and
A substantially V-shaped smoke removal chamber 44 is provided extending along the length direction of the outer surface and extending from the upper end to the lower end. As shown in FIG. 7, the smoke removing chamber 44 is configured to include a duct 46 formed to be bent in a substantially V shape and a duct cover 47 covering substantially the entirety of the duct 46. I have. One end of the duct 46 is opened toward the window 22, while an exhaust port 48 is formed at the other end, and the exhaust port 48 faces the outside through the exhaust port 48. It is opened. As a result, the exhaust from the melt accommodating section 16 of the main body 10 can be circulated inside the smoke removing chamber 44.

Further, the duct 46 of the smoke removing chamber 44 extends from the lower end to the upper end along the portion from the bent portion to the exhaust port 48, that is, along the side wall 11 of the main body 10. The flow path cross-sectional area of the intermediate portion of the rising portion 49 is made larger than other portions, and a partition wall 50 extending continuously in the length direction is formed substantially at the center in the width direction. . As a result, a first passage 52 and a second passage 54 are respectively defined in an intermediate portion of the rising portion 49.

A plurality of filter members 56 are accommodated in the rising section 49 of the duct 46 in such a smoke removing chamber 44. As is clear from FIGS. 8 and 9, this filter member 56
A core bar 60 is inserted into an inner hole of a substantially thick cylindrical heat-resistant filter 58 having a cylindrical shape and the same structure as that of the first embodiment. A substantially thin disk-shaped protection plate 62 for preventing damage to the heat-resistant filter 58 is attached to each end face in the direction.

Thus, in such a smoke removal chamber 44,
Exhaust gas guided from the melt accommodating portion 16 of the main body 10 through the window portion 22 is allowed to flow through the inside thereof, and
9, the heat-resistant filter 58 of the plurality of filters 56
After being passed through the inside and being filtered, it is discharged to the outside through the exhaust port 48.

As is clear from FIG. 7, in such a smoke removing chamber 44, inside the exhaust port 48, a heat resistant filter 51 made of a ceramic porous body having continuous pores therein. Is attached, so that the exhaust gas passing through the gap between the filter member 56 and the wall of the rising portion 49 can be filtered before being discharged from the exhaust port 48. The falling off of the filter member 56 from the port 48 can be effectively prevented.

In the present embodiment, the particulate trapping chamber 63 is installed on the upstream side of the rising section 49 in the exhaust flow direction, particularly in the duct 46 serving as the exhaust passage in such a smoke removing chamber 44. Have been. This particle capturing chamber 63
Has a flow passage cross-sectional area larger than that of the upstream portion, whereby the smoke removal chamber 44
The exhaust gas circulated through the inside of the particle trap chamber 63
The flow velocity can be sharply reduced when the air is guided into the inside, so that the fine particles contained in the exhaust gas can be effectively captured. In addition, such a particle capturing chamber 63
In the device, the bottom portion is screwed to the wall portion so that the bottom portion can be freely attached and detached, so that the fine particles accumulated therein can be easily removed. .

Further, first, second and third stoppers 64, 66 and 68 are provided at the lower end of the inside of the rising portion 49 of the smoke removing chamber 44.
Of these three stoppers, the first and second stoppers 64 and 66 are provided at the entrance of the first passage 52 and the entrance of the second passage 54 in the rising portion 49, respectively. . In addition, the first and second stoppers 64 and 66 are configured such that a pair of plate members
And each of the wall portions of the rising portion 49 facing the partition wall 50, each extending in the direction facing each other, and formed so that both end portions thereof face each other at a predetermined distance from each other. Further, when the pair of plate members are in the first stopper 64, only on the downstream side in the exhaust gas flow direction,
The second stopper 66 is configured such that it can be tilted only to the upstream side. On the other hand, the third stopper 68 is connected to the first passage 52 and the second passage 54.
At a predetermined distance upstream of each entrance of
In a state in which a predetermined dimension is extended from the wall on one side in the opposite direction of the rising portion 49 toward the wall on the other side, and a distal end portion thereof has a predetermined gap with respect to the wall on the other side, It is fixedly arranged.

Thus, inside the rising portion 49 in the duct 46 of the smoke removing chamber 44, the respective inlets of the first and second passages 52 and 54 are connected to the first and second stoppers 6 and 6, respectively.
4, 66, the stoppers 64, 66 are fully opened only when both stoppers 64, 66 are tilted, and the first and second passages 52, 54 are provided.
The upstream side of each inlet is narrowed by a predetermined dimension.

On the other hand, the smoke removing chamber 44 having such a structure.
The diameter and height of the filter member 56 accommodated in the rising portion 49 of the duct 46 of the
9 is smaller than the width of the first and second passages 52 and 54 provided in the first passage 49, so that the first and second passages 5 are formed inside the rising portion 49.
2 and 54 can be rotated and moved in the flow direction of exhaust gas.

Thus, as shown in FIG. 7, when the molten metal for ductile cast iron is supplied into the ladle body 10,
At the time of spheroidizing the molten metal for ductile cast iron, a plurality of (here, ten) filter members 56 are prevented from moving to the upstream side by the first stopper 64, and the opening of the first stopper 64 is closed. A predetermined number (three in this case) of filter members 56 are accommodated and arranged in the first passage 52 of the duct 46 in the smoke removal chamber 44 so as to be closed, and the third stopper 68 It is accommodated and arranged between the first passage 52 and the particle capturing chamber 63 so as to close the opening of the second stopper 66 while preventing the falling into the capturing chamber 63.

Then, as shown in FIG.
After the spheroidizing treatment, when the main body 10 is tilted downward to take out the molten metal for ductile cast iron, the first passage 5
A predetermined number (here, three) of the filter members 56 accommodated in the first passage 52 and the exhaust passage 4
8 and a predetermined number of filter members 56 accommodated between the first passage 52 and the particle capturing chamber 63 cause the first stopper 64 to tilt to the downstream side by its own weight. Are moved into the first passage 52. At this time, the filter member 56 accommodated between the first passage 52 and the particle capturing chamber 63 is used.
In this case, the movement into the second passage 54 is effectively prevented by the second stopper 66.

Further, as shown in FIG. 10B, when the molten metal for ductile cast iron is taken out and the main body 10 is returned to a predetermined state, the first passage 52 and the exhaust port 4 are removed.
8 and a predetermined number of filter members 56
Passes through the second passage 54 and further passes through the second stopper 6
6 is tilted to the upstream side by its own weight, and the first passage 52
Then, it is moved between the particle capturing chamber 63 and the state as shown in FIG. 7 again.

Thus, in the ladle for ductile cast iron according to the present embodiment, every time the main body 10 is tilted and returned to the predetermined state, a predetermined number of filter members 56 are provided from the downstream side to the upstream side. Side so that all of the filter members 56 are in the first and second passages 52,
54.
As a result, the plurality of heat resistant filters 58 that capture the fine particles in the exhaust gas can be used uniformly and more efficiently.

Moreover, in such a ladle for ductile cast iron, such a filter member 56 is used for the ladle main body 10.
A large number of heat-resistant filters 58 constituting the filter member 56 are accommodated and arranged in a large number in the smoke removing chamber 44 installed in a V-shaped bent shape along the outer surface of the side wall portion 11 In addition, a bent path 42 including a plurality of heat-resistant blades 40 is formed in an inner hole of the window portion 22 that guides exhaust gas into the smoke removing chamber 44. Thus, the intrusion of the molten metal into the smoke removing chamber 44 can be effectively prevented.

Therefore, in the ladle for ductile cast iron according to the present embodiment, the effect as in the above embodiment can be favorably enjoyed, and the replacement cycle of the heat resistant filter 58 can be extended more effectively. It can be achieved.

Further, in this ladle for ductile cast iron, since the particulate trapping chamber 63 is provided on the upstream side of the first passage 52, the particulates in the exhaust gas are removed before passing through the heat resistant filter 58. This has the advantage that it can be removed to some extent, the load on the heat resistant filter 58 can be reduced, and the service life of the filter can be extended more effectively.

Although several embodiments of the present invention have been described in detail, these are merely examples, and the present invention is not to be construed as being limited to only those examples.

For example, in the above embodiment, the heat-resistant filters 34, 36, 58 and 51 are all made of a porous material made of a ceramic material. Any material may be used as long as it has heat resistance enough to withstand the temperature of exhaust gas generated at the time of spheroidizing the molten iron for ductile cast iron and continuous pores inside.

The number of the heat-resistant filters and the pore diameter of the pores are not particularly limited, and may be appropriately changed according to the amount of white smoke, dust, gas generated in the ladle body. What you get. For example, in the second embodiment, the filter member 56 is disposed inside the first passage 52 and between the first passage 52 and the particle capturing chamber 63. The number of heat-resistant filters 58 may be increased by disposing the heat-resistant filters 58 inside the passage 54. In the first embodiment, the first heat-resistant filter 34 and the second heat-resistant filter 36 Although the pores have different pore sizes, it is of course possible to make them the same pore size.

Further, the number of the smoke removal chamber in which such a heat-resistant filter is disposed and the number of windows for guiding exhaust gas into the smoke removal chamber also depends on the size of the ladle, the amount of white smoke, dust, gas generated, and the like. Accordingly, it can be determined appropriately.

Further, the structure of the smoke removing chamber is not limited to the one described in the above embodiment.
Any structure can be adopted as long as it is installed on the outer surface of the side wall of the ladle body and has a predetermined heat-resistant filter inside. For example, it is also possible to install a degassing chamber on the outer surface of the side wall of the ladle main body so as to extend along the circumferential direction. It may be configured. Thus, the capacity of the smoke removing chamber and thus the heat-resistant filter can be increased without increasing the size of the ladle body, and the heat-resistant filter can be easily replaced.

Further, the material of the members constituting the smoke removal chamber is not particularly limited, and any material may be employed. Among them, the heat transmitted from the side wall of the ladle main body and the inside of the ladle are circulated. It is desirable to have durability against the heat of the exhaust gas.

Further, in the above embodiment, the heat-resistant blade 40 as the first and second partition members is provided on the window 22.
Although a total of three are provided, the location and number of these partition members are not particularly limited.

Further, in the above embodiment, such a heat-resistant blade 40 is made of a heat-resistant flat steel plate. However, the shape and material of the first and second partition members are not limited to this. It is not limited.

The installation structure of the first and second partition members is not limited to the one described in the above-described embodiment, but may be mutually connected so that a curved path can be formed in the exhaust space. What is necessary is just to be installed so that it may extend in the opposite direction. For example, the partition members may be installed so as to extend in opposite directions in the left-right direction or diagonal direction in the exhaust space, or may be installed in a state where they are inclined at different inclination angles. It is possible, and there is no problem if the partitioning members are joined at various places, not on the sides facing each other, with respect to the part forming the exhaust space.

Further, a frame in which first and second partition members are provided is provided, and the frame is attached to the exhaust space so that it can be freely attached and detached. It is also possible to install the first and second partition members in the space. As a result, repair and replacement of both partition members can be performed with good workability.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included in the scope of the present invention unless they depart from the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a ladle for ductile cast iron according to the present invention.

FIG. 2 is a sectional view of the ladle for ductile cast iron shown in FIG.
It is sectional explanatory drawing.

FIG. 3 is an enlarged sectional explanatory view of a main part showing a part of a longitudinal section of the ladle for ductile cast iron shown in FIG. 1; FIG. 4 is a diagram for explaining an example of an arrangement form of the partition member.

FIG. 4 is a view corresponding to FIG. 1 showing another example of a ladle for ductile cast iron according to the present invention.

5 is a view corresponding to FIG. 2 of the ladle for ductile cast iron shown in FIG. 4;

6 is a view as viewed in the direction of arrow B in FIG. 5;

FIG. 7 is an explanatory sectional view showing a CC section in FIG. 5 in an enlarged manner;

FIG. 8 is a front explanatory view showing an example of a heat-resistant filter disposed in a smoke-removing chamber installed in the ladle for ductile cast iron shown in FIG.

9 is a cross-sectional view taken along the line DD in FIG.

FIG. 10 is an enlarged cross-sectional explanatory view showing main parts of the interior of a smoke removing chamber in different processes when spheroidizing a molten iron for ductile cast iron using the ladle for ductile cast iron shown in FIG. 4; (A) is a diagram showing a state inside the smoke removing chamber when the ladle main body is tilted to take out the molten metal after the spheroidizing treatment, and (b) is a diagram showing the molten metal. It is a figure which shows the state inside a smoke removal room at the time of returning a ladle main body to a normal state after taking out.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body 11 Side wall part 16 Melt accommodation part 20 Lid 22 Window part 24,44 Smoke removal room 34 First heat resistant filter 36 Second heat resistant filter 38 Exhaust space 40 Heat resistant blade 42 Bent path 58 Heat resistant filter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 1/00 B22D 41/00 C21C 1/10 103

Claims (1)

(57) [Scope of request for utility model registration] 1. A method according to claim 1, wherein a molten metal for ductile cast iron supplied to the molten metal accommodating portion is brought into contact with a predetermined spheroidizing agent arranged in the molten metal accommodating portion of the ladle main body having an open upper portion to cause a reaction. A ladle in which the molten iron for ductile cast iron is formed into a sphere, wherein a lid body for opening and closing the opening is attached to an upper opening of the ladle body, and A window for exhausting white smoke, gas, and the like generated in the molten metal accommodating portion is provided on a side wall portion above the surface of the molten metal, and further guided to the outer surface of the side wall portion through the window portion. A smoke removal chamber through which white smoke, gas, and the like from the molten metal storage section inside the main body is circulated is installed, and a heat resistant filter made of a porous body is arranged inside the smoke removal chamber. A melt storage section inside the main body; A heat-resistant first partition member extending from one side to the other side and a heat-resistant second partition member extending from the other side to the one side in the exhaust space formed therebetween. Are arranged alternately so as to overlap by a predetermined length at positions separated by a predetermined distance in a flow direction of exhaust gas in the exhaust space, thereby forming a bent path, thereby forming a ductile iron casting. pot.