JP3343164B2 - Raw material preheating input device and melting furnace using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material preheating system in which the waste heat of a melting furnace is efficiently used for preheating a raw material to be fed next, and the preheated raw material can be fed smoothly and systematically. The present invention relates to a charging device and a melting furnace provided with the raw material preheating charging device.

[0002]

2. Description of the Related Art Conventionally, as a system for preheating a raw material to be charged next using waste gas generated during melting of a raw material in a melting furnace, for example, a system described in JP-A-4-309789 is known. A melting furnace having a raw material preheating tower utilizing waste gas described in Japanese Patent Application Laid-Open No. Hei 4-309789 is provided with a preheating tower having a preheating chamber provided in a stepwise manner from the lower side to the upper side in the upper part of the melting furnace. The waste heat from the furnace is passed upward from the bottom of the preheating tower, and the raw materials held in the preheating chamber near the melting furnace are preheated to high temperatures in order. For this reason, a configuration is adopted in which a raw material holding damper that is openable and closable downward in a double-headed manner is provided below each preheating chamber, and the raw material is supplied downward as needed.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 4-309 is disclosed.
No. 789, in a melting furnace having a raw material preheating tower utilizing waste gas, the raw material holding dampers provided at the lower part of each preheating chamber and openable and closable in a double-opening manner below each other are closed with each other even when closed. The waste heat generated in the melting furnace is directly sent to the raw material preheating tower, and passes from below to above the preheating tower. Therefore, since the raw material held in the lowermost preheating chamber of the raw material preheating tower is directly exposed to the high temperature waste heat of the melting furnace, a part of the raw material is melted and may be welded to the preheating chamber or the raw material holding damper. is there. This makes it difficult to open and close the raw material holding damper, causing fluctuations in the raw material input amount,
In addition, the efficiency of heat transfer to the raw material due to waste heat deteriorates, and in the worst case, the raw material holding damper does not open and the raw material cannot be put into the melting furnace, or the waste heat from the melting furnace cannot be released upward. There is a problem.

[0004] In the melting furnace having the above-described structure, the raw materials are sequentially lowered in the respective preheating chambers of the preheating tower and then charged into the melting furnace. It is necessary to mix a plurality of types of raw materials in advance before putting them into the preheating tower. Further, there is also a problem that during melting of the raw material, the raw material melted in the preheating chamber is dropped into the melting furnace from a gap between the raw material holding dampers that pass the waste heat, thereby changing the composition of the produced alloy. Furthermore, since the waste heat of the melting furnace is configured to pass upward from below the raw material preheating tower, it is difficult to control the temperature in the preheating chamber, and it is difficult to solve the above-described problem. It is.

Accordingly, a basic object of the present invention is to solve the above-mentioned problems of the conventional waste heat utilization system, and to efficiently utilize the waste heat of the melting furnace for preheating the next raw material to be charged. It is another object of the present invention to provide a melting furnace having a raw material preheating charging device capable of smoothly and systematically charging a preheated raw material directly into a melting furnace. Furthermore, an object of the present invention is to be able to automatically feed raw materials from a preheating chamber to a melting furnace,
In particular, in the case of alloy production, without mixing a plurality of types of raw materials in advance, a raw material preheating input device capable of performing raw material input so as to have a predetermined alloy composition in a raw material charging stage from a preheating chamber to a melting furnace, and An object of the present invention is to provide a melting furnace provided with the raw material preheating input device. Still another object of the present invention is to provide a raw material preheating input device capable of preheating a raw material with high thermal efficiency, and enabling continuous preheating / input and continuous melting of a raw material, and a melting furnace equipped with the raw material preheating input device. Is to provide.

[0006]

Melting furnace of the present invention, in order to solve the problems] In order to achieve the basic objective, melting furnace and the preheating chamber and separately, the preheating chamber high temperature atmosphere in the furnace through an exhaust pipe a guidance, yet is obtained as a raw material is preheated in the preheating chamber can directly fed to the melting furnace from the preheating chamber. That is,
The basic configuration of the melting furnace according to the present invention is a melting furnace having a raw material inlet in the upper part, a partition cover for covering the raw material inlet of the melting furnace, and disposed at the upper part of the melting furnace, and A preheating chamber having a lower opening communicating with the raw material input port of the melting furnace at the time of opening the partition lid, and disposed above the raw material input port so that the raw material can be directly input to the melting furnace from the preheating chamber; A raw material storage bucket provided with a raw material holding damper that can be opened and closed at a lower portion, and an exhaust pipe for connecting between the melting furnace and the preheating chamber and introducing a high-temperature atmosphere of the melting furnace into the preheating chamber. Consists of

In particular , according to the present invention, the preheating of the raw material and the charging of the raw material from the preheating chamber to the melting furnace are automatically performed. In particular, in the case of producing an alloy, a predetermined alloy composition can be obtained without mixing a plurality of raw materials in advance. Preheating and feeding of raw materials
A more specific melting furnace of the first aspect is provided. The melting furnace of this embodiment is a melting furnace having a raw material inlet at the top, a partition lid covering the raw material inlet of the melting furnace, and disposed at the upper part of the melting furnace, and at the time of the opening operation of the partition lid A preheating chamber having a lower opening communicating with a raw material input port of a melting furnace, a rotating substrate rotatably disposed in the preheating chamber, and a raw material holding damper attached to the rotating substrate and openable and closable at a lower portion. And at least two raw material storage buckets, and an exhaust pipe for connecting between the melting furnace and the preheating chamber and introducing a high temperature atmosphere of the melting furnace into the preheating chamber. The rotating substrate is disposed at predetermined intervals on a circular line passing above the raw material inlet of the melting furnace, and the bucket is positioned above the raw material inlet of the melting furnace by intermittent rotation of the substrate when the raw material is charged. It is composed of

Further, according to the present invention, there is also provided a more specific melting furnace of the second embodiment which enables continuous melting and casting. The melting furnace of this embodiment has a plurality of melting furnaces having a material input port at the top, a partition cover for covering the material input port of each melting furnace, and a disposing furnace disposed at the upper part of these melting furnaces, and A preheating chamber having a plurality of lower openings each communicating with a raw material input port of each melting furnace at the time of an opening operation, a rotating substrate rotatably disposed in the preheating chamber, and being attached to the rotating substrate and opening and closing at a lower portion; A bucket for storing a plurality of raw materials having a flexible raw material holding damper, and an exhaust pipe for connecting between each of the melting furnaces and the preheating chamber and introducing a high-temperature atmosphere of each melting furnace into the preheating chamber. The plurality of raw material storage buckets are arranged at predetermined intervals on a circular line passing above the raw material input ports of the plurality of melting furnaces of the rotating substrate, and the bucket is intermittently rotated when the raw material is input. Of each raw material inlet of multiple melting furnaces Configured to allowed to sequentially position towards. In a preferred embodiment, the feeding of the raw material preheated in the preheating chamber to the plurality of melting furnaces is controlled so as to be sequentially performed at predetermined time intervals.

According to the present invention, there is also provided a rotary-type raw material preheating charging apparatus suitably used for the melting furnace as described above. The raw material preheating input device is disposed in an upper part of a melting furnace having a raw material input port opened and closed by a partition lid, and has a lower opening in a bottom wall portion corresponding to the raw material input port, and a preheating chamber having the lower opening. A support that is rotatably erected through the support, a rotating substrate that is disposed in the preheating chamber, and whose center is fixed to the support, and a rotating substrate above the raw material input port of the melting furnace. Arranged at predetermined intervals on a circular line passing therethrough, and a plurality of raw material storage buckets provided with a raw material holding damper that can be opened and closed at the bottom, a driving device for rotating the substrate, the melting furnace and a preheating chamber, And an exhaust pipe for introducing the high-temperature atmosphere of the melting furnace into the preheating chamber.

[0010]

As described above, the basic structure of the present invention is that the melting furnace and the preheating chamber are separated from each other, and the high-temperature atmosphere of the melting furnace is led to the preheating chamber via the exhaust pipe, and the raw material in the preheating chamber is formed. Is configured to preheat. Therefore, the raw material in the preheating chamber is not directly exposed to the high-temperature atmosphere of the melting furnace as in the related art, but the raw material in the preheating chamber is melted and adheres to the raw material holding damper at the lower portion of the bucket, thereby preventing the raw material holding damper from being opened and closed. In the case of producing an alloy, the raw material in the preheating chamber is not melted or dropped and mixed into the melting furnace, so that there is no problem that the composition of the alloy to be produced changes. Further, since the high-temperature atmosphere of the melting furnace is introduced into the preheating chamber separated from the melting furnace through the exhaust pipe, the preheating temperature of the raw material in the preheating chamber can be relatively easily controlled. In particular, the exhaust pipe has a double pipe structure including an inner pipe for introducing the high-temperature atmosphere of the melting furnace into the preheating chamber, and an outer pipe surrounding the inner pipe. Connect the outside air supply pipe that connects the space between the inner pipe and the outer pipe to the melting furnace, and perform heat exchange between the waste heat of the melting furnace introduced into the preheating chamber and the air introduced into the melting furnace. As a result, a moderately high temperature atmosphere lower than the high temperature atmosphere of the melting furnace can be introduced into the preheating chamber, and high-temperature air can be introduced into the melting furnace. And the waste heat of the melting furnace can be used more efficiently. In addition, by controlling the degree of heat exchange, the temperature of the high-temperature atmosphere introduced into the preheating chamber can be controlled.

The preheating chamber has a lower opening directly communicating with the raw material inlet of the melting furnace when the partition lid is opened, and a raw material storage bucket provided with a freely openable and closable raw material holding damper at the lower part. Is located in the preheating chamber above the raw material inlet of the melting furnace. Therefore, by controlling the opening operation of the raw material holding damper after the opening operation of the partition cover for covering the raw material input port of the melting furnace, the preheated raw material contained in the bucket is melted from the preheating chamber. It is directly charged into the furnace, and at this time, the high-temperature atmosphere in the melting furnace is not directly released to the outside, there is almost no heat loss from the raw material inlet of the melting furnace, and waste heat can be efficiently preheated. And work environment is improved.

According to the first aspect of the melting furnace of the present invention, the rotating substrate is rotatably disposed in the preheating chamber, and the rotating substrate is disposed at a predetermined interval on a circular line passing above the raw material inlet of the melting furnace. A plurality of buckets for accommodating raw materials are arranged at a predetermined interval around the periphery of the rotating substrate so that a trajectory formed by the bucket as the rotating substrate rotates passes above the raw material inlet of the melting furnace. Buckets are arranged.
Therefore, by rotating the rotating substrate intermittently, each bucket can be sequentially positioned above the raw material charging port of the melting furnace, and the preheating of the raw material and the charging of the raw material from the preheating chamber to the melting furnace are automatically performed. It can be carried out. In the case of alloy production, a plurality of types of raw materials according to the alloy composition are individually stored in respective buckets, held in a preheating chamber and preheated, and then the rotating substrate is intermittently rotated to sequentially melt the respective raw materials. To Therefore, at the stage of charging the raw materials from the preheating chamber to the melting furnace, the raw materials can be charged so as to have a predetermined alloy composition, and there is no need to mix them in advance.

In the second aspect of the melting furnace of the present invention, in addition to the configuration of the first aspect, a plurality of melting furnaces are combined for one preheating chamber.
That is, a common preheating chamber is arranged above the plurality of melting furnaces, and a plurality of lower openings are formed at positions corresponding to the raw material inlets of the respective melting furnaces on the bottom wall of the preheating chamber. An exhaust pipe is connected to the preheating chamber so that the high-temperature atmosphere of each melting furnace is introduced into the preheating chamber. With such a configuration, the raw materials preheated in the common preheating chamber can be continuously supplied to each melting furnace. Also, by alternately feeding and melting raw materials into multiple melting furnaces at predetermined time intervals, tapping from each melting furnace can be performed continuously, enabling continuous melting and casting. Becomes The number of melting furnaces combined with the common preheating chamber is preferably two, but a larger number of melting furnaces can be combined by increasing the size of the preheating chamber.

In the melting furnace of each of the above-described embodiments, a rotating substrate for holding a plurality of buckets for accommodating raw materials is used. The simplest and most preferable form of the rotating substrate is a rotating disk. In addition, rotating conveyor system,
Various types can be adopted, such as one with a radial substrate with multiple arm-shaped bucket holders protruding sideways on the rotating shaft, and the planar shape of the preheating chamber can also be changed according to the rotating substrate. it can. When a disk or a radial substrate is used as the rotating substrate, a support or a rotating shaft penetrating and attached to the center of the rotating substrate is rotatably erected so as to penetrate the preheating chamber, and the support or the rotating shaft is The rotating substrate may be configured to be rotated by rotating, or a support or a support shaft is fixedly provided upright, the rotary substrate is rotatably mounted on the support or the support shaft, and the rotary substrate itself is rotationally driven. It is good also as a structure to make it. In addition, any drive mechanism such as a gear mechanism or a chain drive mechanism can be used as the drive system for the rotating substrate. In a preferred raw material preheating input device, a column is rotatably erected through the preheating chamber, and the rotating substrate is located in the preheating chamber and the center thereof is fixed to the column.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The present invention will be described more specifically. The embodiment shown in FIGS. 1 to 4 shows an example in which two melting furnaces (a first melting furnace 40 a and a second melting furnace 40 b) are combined with a common raw material preheating charging apparatus 10. Preheating chamber 11
Is composed of a peripheral wall portion 12, a top plate 13 and a bottom wall portion 14, and is mounted on two melting furnaces 40a and 40b, and the other side not mounted on the melting furnaces 40a and 40b is As shown in FIG. 2, it is supported by support legs 19. In the bottom wall portion 14 of the preheating chamber 11, symmetrically at positions corresponding to the raw material input ports 41a, 41b (41b is not shown in FIG. 1) formed at the upper portions of the respective melting furnaces 40a, 40b,
Further, a pair of lower openings 15 having a size substantially equal to the size of the material input port are formed (see FIG. 4). A raw material supply port 17 is formed in the top plate 13 of the preheating chamber 11, and the raw material supply port 17 is opened and closed by a hinge mechanism.
8 is covered.

Reference numeral 20 denotes a disk-shaped rotary substrate. The rotary substrate 20 is rotatably erected between two melting furnaces 40a and 40b, and the upper half thereof is a top plate 13 of a preheating chamber 11.
And a support 21 inserted into the central openings 13a, 14a formed in the bottom wall portion 14 through a suitable bearing sealing means (not shown) at a height position such that it is disposed in the preheating chamber 11. Its center is fixed. A plurality of (six in the illustrated embodiment) cylindrical raw material storage buckets 22 are provided around the rotary substrate 20 below the raw material supply port 17 of the preheating chamber 11 and in each of the melting furnaces 40a and 40b. Input port 41a (4
It is penetrated and fixed at equal intervals on a circular line L (see FIG. 3) passing above 1b). That is, in each bucket 22, the locus (L) drawn by the center of each bucket 22 with the rotation of the rotating substrate 20 is below the raw material supply port 17 of the preheating chamber 11 and the raw material input ports 41a, 41b of the melting furnaces 40a, 40b. It is attached to the rotating substrate 20 in a positional relationship such that it passes above 41b. Each bucket 22 has a raw material holding damper 23 which is opened and closed in a double-opening manner at the lower end, and the lower part of the bucket 22 is opened and closed by the opening and closing operation of the raw material holding damper 23. A support 21 erected rotatably on a bearing (not shown) buried in the floor has a bevel gear 34 mounted on its base, and the bevel gear 34 is mounted on a tip of a rotating shaft 32 of a motor 31. The bevel gear 33 meshes with the motor 31 and a pair of bevel gears 33,
The drive device 30 is constituted by 34. The driving device 3
The bucket 22 is operated by intermittently rotating the support 21 and the rotating substrate 20 fixed thereto.
When the raw material is supplied, the melting furnace 40 is located below the raw material supply port 17.
When the raw materials are charged into the melting furnaces 40a and 40b, the raw materials are sequentially positioned above the raw material charging ports 41a and 41b.

First melting furnace 40a and second melting furnace 40b
Have raw material inlets 41a, 41b at the top (the raw material inlet 41b of the second melting furnace 40b is not shown in FIG. 1), and as shown in FIG. 3, the raw material inlets 41a, 41b Lids 42a and 42b for covering the cylinders and cylinders 44a and 44b for opening and closing the raw material inlets 41a and 41b by moving the partition lids are symmetrically arranged. The distal ends of the piston rods 43a, 43b are connected to the respective partition lids 42a, 42b.
Is fixed to the base end. Further, heaters 45a, 4a are provided on the front surfaces of the first melting furnace 40a and the second melting furnace 40b, respectively.
5b are mounted, and tap holes 46a, 46b (the tap hole 46a of the first melting furnace 40a is not shown in FIG. 1) are formed so as to face each other at a lower portion of the facing side surface. A common runner 47 is connected to 46a and 46b. It should be noted that each melting furnace 4 is not used as a common runner.
Separate runners can also be connected to the outlets 46a and 46b of Oa and 40b respectively. In this case, it is not necessary to dispose the outlets of the respective melting furnaces as shown in the drawing.

Exhaust pipes 50a, 50b are provided between the front surfaces of the melting furnaces 40a, 40b and the front side of the top plate 13 of the preheating chamber 11.
b, a substantially L-shaped external exhaust pipe 55 is connected to the rear side of the top plate 13 of the preheating chamber 11. As is clear from FIG. 3, each of the exhaust pipes 50a and 50b has a double pipe structure of the inner pipes 51a and 51b and the outer pipes 52a and 52b. The inner tubes 51a, 51b are connected to the respective melting furnaces 40a, 40
b and the preheating chamber 11 for communicating the high-temperature atmosphere of each of the melting furnaces 40a and 40b into the preheating chamber 11, and the high-temperature atmosphere of each of the lower melting furnaces 40a and 40b has an upper lower-temperature atmosphere. It flows naturally into the preheating chamber 11. An external air suction pipe 53 is provided above each of the outer pipes 52a and 52b.
a, 53b are connected, and the outside air supply pipes 54a, 5b are provided between the lower portions of the outer pipes 52a, 52b and the heaters 45a, 45b.
4b. Therefore, each outside air suction pipe 53
a, 53b from the inner tubes 51a, 51b and the outer tubes 52a, 52
b and the air introduced into the melting furnaces 40a and 40b from the outside air supply pipes 54a and 54b through the space between the inner pipes 51 and 54b.
a, 51b, each melting furnace 40 flowing into the preheating chamber 11
Heat exchange is performed between the high-temperature atmospheres a and 40b, and high-temperature air is introduced into each of the melting furnaces 40a and 40b.
A high-temperature atmosphere suitable for preheating lower than the high-temperature atmosphere temperature of each of the melting furnaces 40a and 40b is introduced into the preheating chamber 11. In addition, each melting furnace 40 is adjusted by a suitable adjusting means such as a valve mechanism.
a, by adjusting the amount of air introduced into 40b,
It is also possible to control the temperature of the high-temperature atmosphere introduced into the preheating chamber 11 through each of the inner tubes 51a and 51b.

Next, the partition between the raw material inlets 41a and 41b of the melting furnaces 40a and 40b and the lower openings 15 of the preheating chamber 11 will be described with reference to FIG. As shown in FIG. 4, the lower opening 15 of the preheating chamber 11 is connected to the raw material input port 4 of the melting furnace.
Although it is formed so as to be continuous right above 1 a, a groove 16 is formed from the lower peripheral edge of the lower opening 15 in contact with the raw material inlet 41 a to the peripheral wall 12 of the preheating chamber 11. Since the partition lid 42a slides in the groove 16 to open and close the raw material inlet 41a, when the raw lid 41a is covered with the raw material inlet 41a as shown in FIG. Communication between 41a and lower opening 15 of preheating chamber 11 is completely shut off. Feeding of raw material A into the melting furnace
With the bucket 22 positioned above the raw material input port 41a, the cylinder 44a is first operated to retract the partition lid 42, the raw material input port 41a is opened, and then the raw material holding damper 23 of the bucket 22 is opened to open the raw material A. Into the melting furnace 40a.

The operation of the illustrated embodiment will now be described. In addition, for convenience of description, in the following description, it is shown as an operation for the first melting furnace 40a. First, the canopy 18 provided above the preheating chamber 11 is opened, and the raw materials A and B are supplied into the preheating chamber 11 from the raw material supply port 17 of the preheating chamber 11.
Raw material is supplied by a crane, a conveyor, or the like. One bucket 22 of a plurality of buckets attached to the rotating substrate 20 is waiting below the raw material supply port 17 and temporarily stores the raw material supplied from the raw material supply port 17 by its own weight. . Next, the column 21 is rotated by the driving device 30 disposed at the lower end of the column 21, and another bucket 22 is made to stand by below the raw material supply port 17 to store the next raw material. This operation is repeated until all the buckets 22 store the raw material. At this point, each bucket 22 is in a standby state for charging the raw material into the melting furnace.
Further, different raw materials A and B are individually stored in each bucket.

Next, the heater 45a is operated to heat the inside of the melting furnace 40a. The atmosphere in the melting furnace 40a becomes high temperature, and this high temperature atmosphere is sent into the preheating chamber 11 through the connected exhaust pipe 50a. The exhaust pipe 50a has a double pipe structure, and the inside of the inner pipe 51a is heated by the high-temperature atmosphere from the melting furnace 40a, and the space between the inner pipe 51a and the outer pipe 52a is sucked from the outside air suction pipe 53a through the outside air suction pipe 53a. Passes,
Thereby, the high-temperature atmosphere is cooled to an appropriate preheating temperature and sent to the preheating chamber 11. The air sucked from the outside air suction pipe 53a is supplied to the inner pipe 51a and the outer pipe 52a of the exhaust pipe 50a.
The heat is exchanged while passing through the space between and the air is sent to the heater 45a through the outside air supply pipe 54a in a high temperature state. The temperature in the preheating chamber 11 also rises due to the high-temperature atmosphere sent from the melting furnace 40a, and the raw materials A and B stored in the bucket 22 are warmed to be in a preheating state. The temperature of the high-temperature atmosphere circulated in the preheating chamber 11 is lowered by heating the inside of the preheating chamber 11 and the raw materials A and B, and is discharged from the external exhaust pipe 55.

When the inside of the melting furnace 40a is sufficiently warmed and the preparation for melting the raw material is completed, the partition lid 42a provided on the upper part of the melting furnace 40a is moved by the operation of the cylinder 44a, and the raw material inlet 41a of the melting furnace 40a is moved. Open. The bucket 22 for storing the raw material to be charged is moved immediately above the raw material input port 41a before the opening operation and is in a standby state.
When 1a opens, the raw material holding damper 23 provided at the lower part of the bucket opens, and the raw material falls into the melting furnace 40a through the raw material inlet 41a by its own weight. After charging the raw materials, bucket 2
The raw material holding damper 23 is closed and the cylinder 44a is closed.
Operates to close the raw material inlet 41a with the partition lid 42a.

In order to further input a different kind of raw material for producing an alloy, the driving device 30 is operated to rotate the column 21 and the rotary substrate 20 fixed thereto, and to separate the bucket 2 from the column 21.
2 is moved onto the raw material inlet 41a closed by the partition lid 42a. The raw materials are again charged, and the mixed raw materials are melted in the melting furnace 40a. The emptied bucket 22 is moved below the raw material supply port 17 of the preheating chamber 11 by rotation of the support 21 and the rotating substrate 20 fixed thereto, and receives the raw material again. The high-temperature atmosphere generated in the melting furnace 40a is always sent from the exhaust pipe 50a to the preheating chamber 11, and continues to preheat the raw material in a standby state. The melted raw material exits from a tap hole 46a of the melting furnace 40a and is sent to a holding furnace (not shown) through a runner 47. The holding furnace inspects the components of the molten metal and adds and adjusts the missing components.
After completion of the component adjustment, the process proceeds to a casting process.

In the embodiment shown, two common preheating chambers 11 are provided.
The base melting furnaces 40a and 40b are combined, and melting is performed while shifting the timing of charging the raw materials into the respective melting furnaces as shown in FIG. As described above, the feeding and melting of the raw material into the first melting furnace 40a and the feeding and melting of the raw material into the second melting furnace 40b are performed with a time lag, so that the preheating chamber 11 can be operated efficiently and the production of casting can be performed. Performance can also be improved. The raw material stored in each bucket 22 is a metal base metal A and a material B which has been made into an alloy once and then turned into scrap material due to processing, defects and the like. Each melting furnace 4
In charging the raw materials to the parts 0a and 40b, it is preferable that the waste material B is charged first, and then the base metal A is charged later. By being charged in this way, the previously input waste material B
It plays the role of a cushion at the time of loading, making it harder to damage the hearth.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment.
Various applications and modifications are possible. In the above-described embodiment, an example of a combination of a common preheating chamber and two melting furnaces is shown. However, a combination with more melting furnaces or one preheating chamber can be combined with one melting furnace. In the case of the batch method, a bucket for storing the raw material can be fixedly disposed in the preheating chamber without using a rotating substrate. In this case, rather than storing the raw materials directly in the preheating chamber, storing the raw materials in a bucket and arranging them in the preheating chamber as in the present invention can improve the preheating of the raw materials and the operability of opening and closing the partition lid of the raw material inlet. It is preferred in that respect. It will also be apparent that the invention is applicable to various types of melting furnaces.

[0026]

As described above, according to the raw material preheating charging apparatus of the present invention and the melting furnace using the same, the following various effects and advantages can be obtained. (A) The basic configuration of the present invention is to separate the melting furnace and the preheating chamber separately, guide the high-temperature atmosphere of the melting furnace to the preheating chamber via an exhaust pipe, and preheat the raw material in the preheating chamber. The problem that the raw material in the preheating chamber is not directly exposed to the high temperature atmosphere of the melting furnace as in In addition, in the case of producing an alloy, there is no problem that the composition of the produced alloy changes because the raw material in the preheating chamber is not melted and dropped and mixed into the melting furnace. (B) Since the preheated raw material contained in the bucket is directly charged into the melting furnace from the preheating chamber, the high-temperature atmosphere in the melting furnace is not directly discharged to the outside, and the raw material charging port of the melting furnace is not provided. Heat is efficiently used for preheating the raw material, and the working environment is improved.

(C) As in a more specific first embodiment of the present invention, each bucket is sequentially positioned above a raw material inlet of a melting furnace by intermittently rotating a rotating substrate. Thereby, the preheating of the raw material and the charging of the raw material from the preheating chamber to the melting furnace can be automatically performed. In the case of alloy production, a plurality of types of raw materials according to the alloy composition are individually stored in respective buckets, held in a preheating chamber and preheated, and then the rotating substrate is intermittently rotated to sequentially melt the respective raw materials. Therefore, at the stage of charging the raw material from the preheating chamber to the melting furnace, the raw material can be charged so as to have a predetermined alloy composition, and there is no need to mix them in advance.

(D) By combining a plurality of melting furnaces with one preheating chamber as in the second more specific embodiment of the present invention, raw materials preheated in a common preheating chamber can be used. Each melting furnace can be continuously charged. Also,
By alternately feeding and melting the raw materials into a plurality of melting furnaces at predetermined time intervals, the molten metal is continuously discharged from each melting furnace, thereby enabling continuous melting and casting. .

(E) Since the high-temperature atmosphere of the melting furnace is introduced into a preheating chamber separated from the melting furnace through an exhaust pipe,
The preheating temperature of the raw material in the preheating chamber can be controlled relatively easily. In particular, the exhaust pipe has a double-pipe structure including an inner pipe for introducing the high-temperature atmosphere of the melting furnace into the preheating chamber and an outer pipe surrounding the inner pipe. By performing heat exchange between the heat and the air introduced into the melting furnace, a more appropriate high-temperature atmosphere lower than the high-temperature atmosphere temperature of the melting furnace can be introduced into the preheating chamber, and high-temperature air can be introduced into the melting furnace. Therefore, the temperature in the melting furnace can be increased in a shorter time, and thus the time required for melting can be shortened, and the waste heat of the melting furnace can be used more efficiently. In addition, by controlling the degree of heat exchange, the temperature of the high-temperature atmosphere introduced into the preheating chamber can be controlled. Other advantages of the invention and other specific advantages of each embodiment will be apparent to those skilled in the art from the foregoing description.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment in which a raw material preheating input device of the present invention is combined with two melting furnaces.

FIG. 2 is a longitudinal sectional side view of the device shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a partially enlarged sectional view showing a bucket disposed in a preheating chamber of the apparatus shown in FIG.

FIG. 5 is a process chart showing an example of a melting-casting process of the apparatus shown in FIG.

[Explanation of symbols]

Reference Signs List 10 raw material preheating input device, 11 preheating chamber, 12 peripheral wall portion, 13 top plate, 14 bottom wall portion, 15 lower opening, 16 groove portion, 17 raw material supply port, 18 canopy, 20 rotating substrate, 21 support, 22 bucket, 23 raw material Holding damper, 30 drive device,
40a first melting furnace, 40b second melting furnace, 41
a, 41b material inlet, 42a, 42b partition lid,
44a, 44b cylinder, 45a, 45b heater, 46a, 46b tap hole, 47 runner, 50
a, 50b exhaust pipe, 51a, 51b inner pipe, 52
a, 52b outer pipe, 53a, 53b external air suction pipe,
54a, 54b external air supply pipe, 55 external exhaust pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F27D 3/00 F27D 13/00

Claims (8)

(57) [Claims] 1. A melting furnace (40a) having a raw material inlet (41a) at an upper part, a partition lid (42a) for covering the raw material inlet of the melting furnace, and a melting furnace (40a). A preheating chamber (11) having a lower opening (15) communicating with a raw material input port (41a) of the melting furnace when the partition lid (42a) is opened, and rotatably disposed in the preheating chamber. A rotating substrate (20), at least two raw material storage buckets (22) attached to the rotating substrate and provided at the bottom with openable and closable raw material holding dampers (23); the melting furnace (40a); To the room (11),
An exhaust pipe (50a) for introducing a high-temperature atmosphere of the melting furnace into the preheating chamber;
2) using the melting furnace (40a) for the rotating substrate (20);
Are arranged at predetermined intervals on a circular line (L) passing above the raw material input port (41a), and the bucket (22) is intermittently rotated at the time of the raw material input to move the bucket (22) to the raw material input port (41) of the melting furnace.
a melting furnace adapted to be positioned above a). 2. A plurality of melting furnaces (40a, 40b) having a raw material charging port (41a, 41b) in an upper part, partition lids (42a, 42b) for covering the raw material charging ports of each melting furnace, and A plurality of lower openings (15) arranged above the melting furnaces (40a, 40b) and communicating with the raw material input ports (41a, 41b) of the respective melting furnaces when the partition lids (42a, 42b) are opened. A preheating chamber (11), a rotating substrate (20) rotatably disposed in the preheating chamber, and a plurality of raw material holding dampers (23) attached to the rotating substrate and openable and closable at the bottom. An exhaust pipe (50a) for connecting a bucket (22) for storing raw materials, each of the melting furnaces (40a, 40b) and the preheating chamber (11), and introducing a high-temperature atmosphere of each melting furnace into the preheating chamber. , 50b). The bucket (22) for storing material is connected to the plurality of melting furnaces (40a, 40) for the rotating substrate (20).
b) are arranged at predetermined intervals on a circular line (L) passing above each of the raw material inlets (41a, 41b), and the bucket (22) is intermittently rotated at the time of raw material input so that the buckets (22) are connected to a plurality of melting furnaces ( 40a, 40b) of each material input port (41a, 41
b) a melting furnace arranged to be positioned sequentially above; 3. The exhaust pipe (50a, 50b) has a double pipe structure, and surrounds the inner pipe (51a, 51b) for introducing a high-temperature atmosphere of a melting furnace into a preheating chamber. An outer pipe (52a, 52b), and an outer air suction pipe (53a, 53b) and an outer air supply pipe (54a, 54b) for connecting a space between the inner pipe and the outer pipe to the melting furnace. The melting furnace according to any one of claims 1 and 2 , wherein 4. A rotating board (20) in which a plurality of buckets (22) are disposed, a center of which is located in a preheating chamber (1).
Melting furnace according to any one of which claims 1 to 3 is fixed to the pierced rotatable strut (21) to 1). 5. The opening / closing of the raw material holding dampers (23) of the partition lids (42a, 42b) and the bucket (22) located above the partition lids is performed by opening the raw material holding damper after the opening operation of the partition lid. The melting furnace according to any one of claims 1 to 4 , which is controlled as follows. 6. preheating chamber (11) a plurality of melting furnace preheated raw materials (40a, 40b) according to claim 2 or 5 is turned to is controlled so as to sequentially performed at intervals predetermined time
The melting furnace according to any one of the above. 7. A lower opening in a bottom wall (14) disposed above a melting furnace (40a) having a raw material inlet (41a) opened and closed by a partition lid (42a) and corresponding to the raw material inlet. A preheating chamber (11) having a (15), a post (21) that penetrates through the preheating chamber and is rotatably provided upright, and is disposed in the preheating chamber (11), and has a center portion at the center of the post. A rotating substrate (20) fixed to the substrate and a circular line (L) passing above the raw material inlet (41a) of the melting furnace at a predetermined interval, and the lower portion is openable and closable at a lower portion. A plurality of raw material holding buckets (22) having a raw material holding damper (23), a driving device (30) for rotating the rotary substrate (20), and a connection between the melting furnace and the preheating chamber. And an exhaust pipe (50a) for introducing the high-temperature atmosphere of the melting furnace into the preheating chamber. And a raw material preheating input device. 8. The preheating chamber (11) includes a plurality of melting furnaces (4).
0a, 40b), and has a plurality of lower openings (15) in a bottom wall (14) corresponding to the raw material inlets (41a, 41b) of each melting furnace. The respective melting furnaces (40a, 40b) are communicated with exhaust pipes (50a, 50b) having a double pipe structure, respectively.
8. The raw material preheating charging apparatus according to 7 .