CN117146588A - Induction furnace and method for acquiring state of induction furnace - Google Patents
Induction furnace and method for acquiring state of induction furnace Download PDFInfo
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- CN117146588A CN117146588A CN202310326286.1A CN202310326286A CN117146588A CN 117146588 A CN117146588 A CN 117146588A CN 202310326286 A CN202310326286 A CN 202310326286A CN 117146588 A CN117146588 A CN 117146588A
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- 230000006698 induction Effects 0.000 title claims abstract description 217
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 134
- 239000000463 material Substances 0.000 claims abstract description 97
- 238000002844 melting Methods 0.000 claims abstract description 93
- 230000008018 melting Effects 0.000 claims abstract description 93
- 239000002994 raw material Substances 0.000 claims abstract description 67
- 239000011819 refractory material Substances 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims description 42
- 230000006866 deterioration Effects 0.000 claims description 40
- 230000007423 decrease Effects 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 description 20
- 230000008569 process Effects 0.000 description 19
- 239000012768 molten material Substances 0.000 description 15
- 239000000155 melt Substances 0.000 description 12
- 238000012790 confirmation Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 10
- 238000006731 degradation reaction Methods 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 9
- 230000007704 transition Effects 0.000 description 8
- 239000000725 suspension Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000004397 blinking Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/20—Arrangement of controlling, monitoring, alarm or like devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
The present invention provides an induction furnace and a state acquisition method of the induction furnace, wherein the induction furnace comprises: a furnace main body part formed of a refractory material, the furnace main body part being internally charged with a melting raw material; an induction heating coil wound so as to surround the outer periphery of the furnace body, the induction heating coil being configured to melt a melting material; and a control unit. The control unit performs control to acquire the state of the furnace based on the load resistance value or voltage of the induction heating coil.
Description
Technical Field
The present invention relates to an induction furnace and a method for acquiring the state of the induction furnace, and more particularly, to an induction furnace and a method for acquiring the state of the induction furnace, each of which includes a furnace body portion made of a refractory material and having a melting raw material charged inside.
Background
Conventionally, an induction furnace is known which includes a furnace body portion formed of a refractory material and into which a melting raw material is charged. Such an induction furnace and a method for acquiring the state of the induction furnace are disclosed in, for example, japanese patent application laid-open No. 2012-505365.
Japanese patent application publication 2012-505365 discloses an induction furnace including a furnace body portion formed of a refractory and having a melting material charged therein, and an induction coil. The induction furnace melts the melting raw material charged into the furnace body by induction heating with an induction heating coil.
Although not described in japanese patent application laid-open No. 2012-505365, in a conventional induction furnace, in order to obtain the state of the furnace such as the molten state of the molten raw material inside the furnace main body portion and the state of deterioration of the furnace main body portion, it is necessary to perform a confirmation operation such as visual observation or measurement of the furnace by an operator. Accordingly, an induction furnace and a method for acquiring the state of the induction furnace are desired, which can acquire the state of the furnace without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an induction furnace and a method for acquiring the state of the induction furnace, which can acquire the state of the furnace without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
In order to achieve the above object, an induction furnace according to a first aspect of the present invention includes: a furnace main body part formed of a refractory material, the furnace main body part being internally charged with a melting raw material; an induction heating coil wound so as to surround the outer periphery of the furnace body, the induction heating coil being configured to melt a melting material; and a control unit that performs control for acquiring the state of the furnace based on the load resistance value or voltage of the induction heating coil.
As described above, the induction furnace according to the first aspect performs control by the control unit to obtain the state of the furnace based on the load resistance value or voltage of the induction heating coil. The inventors of the present application have paid attention to the fact that the load resistance value and the voltage of the induction heating coil change in response to a change in the state of the furnace such as the melting state of the melting material inside the furnace main body portion and the state of deterioration of the furnace main body portion, and have found that the state of the furnace can be obtained by the control portion based on the relationship between the state of the furnace and the load resistance value of the induction heating coil. Accordingly, the state of the furnace can be obtained by the control unit based on the load resistance value or the voltage of the induction heating coil, and thus the state of the furnace can be obtained without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
In the induction furnace according to the first aspect, the control unit preferably performs the following control: based on the load resistance value of the induction heating coil, a state of the furnace including at least one of a state of deterioration of the furnace main body portion and a melted state of the melted material inside the furnace main body portion is obtained. According to this configuration, even if the operator does not confirm the furnace, the control unit can acquire at least one of the state of deterioration of the furnace main body and the melted state of the melted material inside the furnace main body.
In the induction furnace according to the first aspect, the control unit preferably obtains a state of deterioration of the furnace body unit based on a change in the load resistance value at every predetermined period. According to this configuration, the transition of the deterioration of the furnace body can be obtained from the change in the load resistance value at every predetermined period.
In this case, the control unit preferably acquires the state of deterioration of the furnace main body unit based on a change in the lowest value of the load resistance values at predetermined intervals, which is a change in the load resistance values at predetermined intervals. According to this configuration, even when an abnormally high load resistance value (noise) is obtained within a predetermined period, the influence of noise can be eliminated. As a result, the deteriorated state of the furnace body can be obtained with higher accuracy.
In the induction furnace according to the first aspect, the control unit preferably obtains the melted state of the melted material inside the furnace body based on a change in the load resistance value per unit time during the operation from the start of the feeding of the melted material to the tapping of the melted material. According to this configuration, the change in the melting state of the melting material inside the furnace body can be obtained during the operation of the induction furnace.
In the above-described configuration in which the control unit obtains the molten state of the melting material inside the furnace main body portion based on the change in the load resistance value per unit time during the operation from the start of the feeding of the melting material to the tapping, the control unit preferably performs the following control: based on the decrease in the load resistance per unit time during the operation from the start of the feeding of the melting material to the tapping, it is determined whether or not the melting material is in a state of being too small inside the furnace body. According to this configuration, when the control unit determines that the amount of the melting raw material is too small inside the furnace main body, the melting raw material can be efficiently melted by charging the melting raw material. As a result, the melting material in the amount of the rated capacity of the furnace main body can be melted in a shorter time, and therefore, an increase in the power consumption of the induction heating coil can be suppressed.
In this case, the control unit performs the following control: when the state in which the amount of the molten raw material in the furnace main body portion is too small continues for a predetermined time or longer, it is determined that the molten raw material is in a suspended state in which the molten raw material does not fall due to the arc formation of the molten raw material in the furnace main body portion. According to this configuration, even if the operator does not visually check the suspension, the control unit can detect that the suspension is in the suspended state. As a result, when the state of the furnace is the suspended state, the worker can promptly perform the process of releasing the suspended state.
In the induction furnace according to the first aspect, the control unit preferably performs the following control: based on the load resistance value of the induction heating coil, the state of the furnace including both the state of deterioration of the furnace main body portion and the melted state of the melted material inside the furnace main body portion is obtained. According to this configuration, even if the operator does not confirm the furnace, the control unit can acquire both the state of deterioration of the furnace main body and the melted state of the melted material inside the furnace main body based on the load resistance value of the induction heating coil. The state of deterioration of the furnace main body portion and the melted state of the melted material inside the furnace main body portion can be obtained based on the load resistance value of the induction heating coil. Thus, both the state of deterioration of the furnace main body and the melted state of the melted material inside the furnace main body can be obtained more easily than in the case of obtaining based on different indices.
In the induction furnace according to the first aspect, the induction heating coil preferably includes a plurality of induction heating coils arranged side by side in a depth direction of the furnace main body, and the control unit preferably performs the following control: at least one of a state of degradation of a portion of the furnace main body portion corresponding to a position of each of the plurality of induction heating coils in the depth direction and a melted state of a melted material inside the furnace main body portion corresponding to the position of each of the plurality of induction heating coils in the depth direction is obtained based on a load resistance value of each of the plurality of induction heating coils. According to such a configuration, in the case of performing control to acquire the state of degradation of the portion of the furnace main body portion corresponding to the position of each of the plurality of induction heating coils in the depth direction, it is possible to easily acquire local degradation (wear) and the portion of occurrence of degradation (wear) occurring in the furnace main body portion, as compared with the case of acquiring the state of degradation of the entire furnace main body portion based on the load resistance value of 1 induction heating coil. In addition, when the control is performed to obtain the melted state of the melted material inside the furnace main body portion corresponding to the position of each of the plurality of induction heating coils in the depth direction, the change in the melted state of the melted material in the depth direction can be obtained. As a result, abnormal portions such as a suspended state inside the furnace body can be easily found.
In the induction furnace according to the first aspect, it is preferable that the control unit outputs the acquired information on the state of the furnace, and the induction furnace further includes a notification unit that notifies the state of the furnace based on the information on the state of the furnace output from the control unit. According to this configuration, the operator can easily grasp the state of the furnace by the notification of the notification unit.
The state acquisition method of the induction furnace of the second aspect of the present invention comprises the steps of: an induction heating step of melting a melting material by induction heating of an induction heating coil wound so as to surround an outer periphery of a furnace main body portion made of a refractory; an acquisition step of acquiring a load resistance value of the induction heating coil; and a state acquisition step of acquiring a state of the furnace based on the load resistance value acquired in the acquisition step.
In the method for acquiring the state of the induction furnace according to the second aspect, since the state of the furnace can be acquired based on the load resistance value as described above, the state of the furnace can be acquired without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
According to the present invention, as described above, it is possible to provide an induction furnace and a method for acquiring the state of the induction furnace, which can acquire the state of the furnace without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
Drawings
Fig. 1 is a schematic view showing an induction furnace according to a first embodiment of the present invention.
Fig. 2 is a graph showing an example of the transition of the thickness of the refractory (furnace body).
Fig. 3 is a graph showing a relationship between the thickness of the furnace body and the rate of change of the load resistance value.
Fig. 4 is a diagram showing an example of display of a display unit of the induction furnace according to the first embodiment.
Fig. 5 is a diagram showing an example of a graph showing a transition of the thickness of the refractory (furnace body) displayed on the display unit according to the first embodiment.
Fig. 6 is a graph showing a correspondence relationship between a graph showing a change in load resistance value in one cycle and a graph showing a change in load resistance value change rate in one cycle.
Fig. 7 is a view showing an example of display in a material shortage state.
Fig. 8 is a view showing an example of display in the suspended state.
Fig. 9 is a flowchart showing an example of the refractory thickness (wear degree) acquisition process performed by the control unit according to the first embodiment.
Fig. 10 is a flowchart showing an example of the process of acquiring the state of the furnace performed by the control unit according to the first embodiment.
Fig. 11 is a schematic view showing an induction furnace according to a second embodiment of the present invention.
Fig. 12 is a graph showing a change in load resistance value in the depth direction in the case where partial wear occurs in the induction furnace of the second embodiment.
Fig. 13 is a graph showing a change in load resistance value in the depth direction in the case where a suspended state occurs in the induction furnace of the second embodiment.
Detailed Description
Embodiments embodying the present invention will be described below based on the drawings.
First embodiment
The overall structure of an induction furnace 100 according to a first embodiment of the present invention will be described with reference to fig. 1.
The induction furnace 100 includes a furnace main body 10, an induction heating coil 20, and a control unit 30. The induction furnace 100 further includes a current detecting unit 40 and a storage unit 50.
The furnace body 10 is formed of a refractory material, and the melting raw material M is charged inside the furnace body 10. The furnace body 10 is, for example, a crucible formed of a refractory material including ceramics such as alumina or silica. The melting raw material M is, for example, a metal. The induction heating coil 20 is wound so as to surround the outer periphery of the furnace body 10, and the melting material M is melted by induction heating. The melting material M is melted inside the furnace body 10 to form a melt Ma.
In the present specification, the depth direction of the furnace body 10 is referred to as the Y direction. The side of the furnace body 10 where the furnace lid 11 is disposed is referred to as the Y1 direction, and the side of the bottom wall 10a of the furnace body 10 is referred to as the Y2 direction. One side in the X direction orthogonal to the Y direction is referred to as the X1 direction, and the other side in the X direction is referred to as the X2 direction. Further, the entire furnace body 10 is inclined about the axis in the X direction, so that the melt Ma flows out from the outlet 10 b.
The control unit 30 controls the entire induction furnace 100. The control unit 30 performs control to acquire the state of the furnace based on the load resistance value of the induction heating coil 20. The control unit 30 outputs the acquired information on the state of the furnace. In the first embodiment, the control unit 30 performs the following control: the state of deterioration of the furnace main body 10 (refractory) and the melted state of the melted material M inside the furnace main body 10 are obtained as the state of the furnace. The control unit 30 includes a CPU (Central Processing Unit: central processing unit), a ROM (Read Only Memory), a RAM (Random Access Memory: random access Memory), and the like. The control unit 30 is, for example, a processor.
The current detection unit 40 detects a current flowing through the induction heating coil 20. The control unit 30 performs feedback control as follows: the current flowing through the induction heating coil 20 is controlled based on the current value detected by the current detecting unit 40. The control unit 30 obtains the load resistance value of the induction heating coil 20 based on the current value detected by the current detection unit 40. Specifically, the control unit 30 calculates the load resistance value of the induction heating coil 20 by dividing the usage power by the square of the current value.
The storage section 50 includes a nonvolatile memory, a Hard Disk Drive (HDD), an SSD (Solid State Drive) or the like. The storage unit 50 stores programs for performing various controls of the control unit 30. The load resistance value of the induction heating coil 20 acquired by the control unit 30 is stored in the storage unit 50.
The induction furnace 100 further includes a display 61, a warning lamp 62, and a buzzer 63. The display unit 61, the warning lamp 62, and the buzzer 63 notify the state of the oven based on the information of the state of the oven output from the control unit 30. The display unit 61, the warning lamp 62, and the buzzer 63 are examples of the "notification unit" of the present disclosure.
When an abnormality (abnormality in the furnace) occurs in the molten state of the molten raw material M inside the furnace main body 10, the display unit 61 notifies the operator of the abnormality in the molten state of the molten raw material M inside the furnace main body 10 by displaying an image. The display section 61 includes, for example, a liquid crystal display or an organic EL display. The display unit 61 displays the deteriorated state of the furnace body 10 by using an image. Details of the display section 61 will be described later.
When an abnormality occurs in the molten state of the molten raw material M inside the furnace main body 10, the warning lamp 62 is turned on or blinked to notify the operator that an abnormality has occurred in the molten state of the molten raw material M inside the furnace main body 10.
When an abnormality occurs in the melted state of the melted material M inside the furnace main body 10, the buzzer 63 notifies the operator of the abnormality in the melted state of the melted material M inside the furnace main body 10 by sound.
The induction furnace 100 further includes an operation unit 70. The operation unit 70 includes an input device such as an operation panel or a touch panel provided on the display unit 61. The operation unit 70 receives an input operation by an operator, and outputs a signal based on the received input operation to the control unit 30.
The induction furnace 100 may further include a weight measuring unit for measuring the weight of the molten material M including the molten metal Ma in the furnace body 10.
The control unit 30 performs control to obtain the state of the furnace including the state of deterioration of the furnace main body 10 based on the load resistance value of the induction heating coil 20. The control unit 30 performs control for acquiring the state of the furnace including the melted state of the melted material M inside the furnace body 10 based on the load resistance value of the induction heating coil 20. That is, in the first embodiment, the control unit 30 performs the following control: based on the load resistance value of the induction heating coil 20, the state of the furnace including both the state of deterioration of the furnace main body 10 and the melted state of the melted material M inside the furnace main body 10 is obtained.
(acquisition and display of deteriorated state of furnace Main body)
The refractory (furnace body 10) is worn out and gradually deteriorates as the induction furnace 100 operates. In addition, when deterioration of the furnace main body 10 due to wear progresses to the recommended reference value, a lining change (rebuilding furnace) of the furnace main body 10 for remanufacturing the wear is performed. Therefore, it is necessary to acquire the deterioration state of the furnace main body 10 due to wear so as to grasp the timing of proper lining replacement (rebuilding of the furnace).
Here, when deterioration of the furnace main body 10 due to wear progresses, the load resistance value of the induction heating coil 20 increases. Specifically, when the furnace body 10 is worn, the thickness of the furnace body 10 is reduced, and the distance between the induction heating coil 20 and the melt Ma (melt M) is shortened. Further, since the distance between the induction heating coil 20 and the melt Ma (melt M) is shortened, the electric coupling between the induction heating coil 20 and the melt Ma (melt M) is enhanced, and the apparent resistance value is increased. That is, there is a correlation between the change in thickness of the furnace main body 10 and the load resistance value of the induction heating coil 20. Therefore, when melting is repeated and the refractory (furnace main body 10) is worn, the load resistance increases, and when the furnace main body 10 is subjected to lining replacement (rebuilding furnace) for rebuilding the worn furnace main body 10, the thickness of the furnace main body 10 increases (returns to the reference value), as shown in fig. 2, and the load resistance value of the induction heating coil 20 decreases.
In addition, in the calculation performed when designing the furnace body 10 of the induction furnace 100, the load resistance value is calculated from the thickness of the furnace body 10 (the distance between the induction heating coil 20 and the melt Ma) formed of the refractory. That is, load resistance values corresponding to the thicknesses of the various furnace main body portions 10 were calculated. Then, a graph as shown in fig. 3 can be created based on the thickness of the furnace main body 10 (the distance between the induction heating coil 20 and the melt Ma) and the calculated load resistance value. Then, parameters for calculating the thickness of the refractory (furnace body 10) from the load resistance value of the induction heating coil 20 can be obtained using the graph shown in fig. 3.
The control unit 30 obtains the state of deterioration of the furnace main body 10 based on the change in the load resistance value at every predetermined period. Specifically, the control unit 30 obtains the state of deterioration of the furnace main body 10 based on the change of the lowest value of the load resistance values at predetermined intervals, which is the change of the load resistance values at predetermined intervals. For example, the control unit 30 obtains the lowest value of the load resistance value on each day of operation of the induction furnace 100. Then, the control unit 30 stores the lowest value of the obtained load resistance values for each working day in the storage unit 50. The control unit 30 obtains the thickness of the refractory (furnace body 10) based on the lowest value of the load resistance values for each working day stored in the storage unit 50, and creates a transition in the thickness (wear degree) of the refractory every other working day. Specifically, the control unit 30 creates a change in the thickness of the refractory material every other working day in which the thickness of the refractory material before wear is 100% (reference value) in furnace construction, furnace replacement (furnace rebuilding), or the like.
An image 61a showing the power consumption of the induction furnace 100 and the like as shown in fig. 4 is displayed on the display unit 61. In the image 61a, the power consumption and the like of the induction furnace 100 are shown together with the wear degree of the refractory (furnace body 10). In the example shown in fig. 4, "95%" which is a ratio of the current thickness of the refractory to the thickness of the reference refractory is shown as the wear degree of the refractory (furnace main body 10).
Further, the operator can grasp the transition of the thickness (wear degree) of the refractory every other working day by performing an operation for confirming "transition details" by the operation unit 70. Specifically, as shown in fig. 5, a graph 61b showing the change in thickness of the refractory material every other working day produced by the control unit 30 is displayed on the display unit 61 under the control of the control unit 30. Then, the worker can easily grasp the change in thickness of the refractory material on every other working day by visually confirming the graph 61b showing the change in thickness of the refractory material on every other working day displayed on the display unit 61 or the numerical value based on the thickness (wear degree) of the refractory material displayed on the display unit 61. The vertical axis of the graph 61b (see fig. 5) is represented as the refractory thickness, but the vertical axis may be represented as the wear degree.
The control unit 30 obtains the melted state of the melted material M inside the furnace body 10 based on the change in the load resistance value per unit time during the operation from the start of the feeding of the melted material M to the tapping. Specifically, the control unit 30 performs the following control: based on the decrease in the load resistance per unit time during the operation from the start of the feeding of the melting raw material M to the tapping, it is determined whether or not the melting raw material M is too small inside the furnace main body 10.
(acquisition and display of in-furnace State)
Here, since the melting raw material M is melted to be in the molten state Ma, the volume of the melting raw material M charged into the furnace main body 10 is reduced as compared with that before melting. When the volume of the molten raw material M including the molten metal Ma is small relative to the rated capacity of the furnace body 10, the electric coupling state becomes weak, and the apparent resistance value decreases. That is, when the melting material M is sufficiently charged with respect to the rated capacity of the furnace main body 10, the load resistance value of the induction heating coil 20 increases. On the other hand, when the melting material M is not sufficiently charged with respect to the rated capacity of the furnace main body 10, the load resistance value of the induction heating coil 20 becomes low.
The control unit 30 acquires the load resistance value of the induction heating coil 20 at predetermined time intervals in one cycle (1 charge) from the start of charging the melting material M into the furnace main body 10 to the time when the melting material M is discharged from the liquid outlet 10b as the melt Ma in the amount equal to the rated capacity of the induction furnace 100. The control unit 30 acquires the load resistance value of the induction heating coil 20 at predetermined time intervals of, for example, several minutes to several seconds. The control unit 30 obtains the load resistance value when the rated power is applied at predetermined time intervals. The control unit 30 also performs control to store the lowest value of the load resistance value in one cycle in the storage unit 50. Specifically, the following control is performed: at each cycle, the melting raw material M (melt Ma) in an amount of a rated weight is stored in the furnace main body 10, and the lowest value of the load resistance value when rated power is applied is stored in the storage unit 50. The weight of the molten material M may be obtained by measuring the level of the molten material Ma using a sensor, or may be obtained by inputting the weight of the molten material M charged into the furnace body 10 by an operator. In addition, when the induction furnace 100 is provided with a weight measuring unit for measuring the weight of the molten raw material M, the weight of the molten raw material M may be obtained based on the measurement result of the weight measuring unit. In addition, for example, power at a power receiving point is used for power acquisition. The control unit 30 also performs control to store the lowest value of the load resistance values in 1 day out of the lowest values of the load resistance values in each cycle in the storage unit 50.
The control unit 30 also performs the following control: when the rate of decrease in the load resistance per unit time during the operation from the start of the feeding of the molten raw material M to the tapping thereof exceeds a predetermined material shortage threshold, it is determined that the molten raw material M is in a state of being excessively small inside the furnace main body 10, and an abnormality alarm in the furnace is issued. In the example shown in fig. 6, the load resistance change rate is changed from the value at the previous measurement to the negative direction by exceeding the predetermined material shortage threshold value, and the in-furnace abnormality alarm is given for each of the elapsed times t1, t3, and t 5.
The display unit 61 displays that the state of the furnace is in the material shortage state based on the information of the state of the furnace output from the control unit 30. Specifically, when the control unit 30 determines that the melting material M is in a too small state, that is, in a too small state inside the furnace main body 10, the control unit 30 performs the following control: as shown in fig. 7, an image 61c indicated as "too little material" in the info field is displayed on the display unit 61 as an in-furnace abnormality alarm. In addition, in the warning lamp 62 and the buzzer 63, when the control unit 30 determines that the material is too small, the control unit 30 notifies the warning lamp 62 and the buzzer 63 of the abnormal alarm in the furnace.
The control unit 30 also performs the following control: when the load resistance value per unit time during the operation from the start of the feeding of the molten raw material M to the discharge of the liquid rises due to the additional feeding of the molten raw material M, the abnormality alarm in the furnace is released. In the example shown in fig. 6, the control unit 30 performs control to cancel the abnormality alarm in the furnace, which is issued at the elapsed times t1, t3, and t5, respectively, at the elapsed times t2, t4, and t 6.
The control unit 30 performs control to determine whether or not the molten raw material M is in a suspended state (see fig. 13) in which the molten raw material M (molten raw material Mb) forms (builds) an arch in the furnace main body 10 and the molten raw material M does not fall, in addition to control to determine whether or not the molten raw material M is too small. Specifically, the eddy current generated by induction heating flows through the point contact portions of the plurality of molten materials M to cause the plurality of molten materials M to be spot-welded to each other, so that the plurality of molten materials M are entangled with each other in the furnace main body 10, and the molten materials Mb form an arch shape.
The control unit 30 performs the following control: when the state in which the amount of the melting material M on the inner side of the furnace main body 10 is too small continues for a predetermined time or longer, the state is determined to be in the suspended state. Specifically, the control unit 30 determines that the melting material M is in the suspended state when the state in which the melting material M is too small inside the furnace main body 10 continues for a predetermined time or longer. The control unit 30 may determine that the melting material M is in the suspended state when the state in which the melting material M is too small in the furnace main body 10 continues for a predetermined time or longer and the decrease in the load resistance per unit time from the start of the operation until the melting material M is discharged exceeds a predetermined suspended threshold set to a value larger than the predetermined material too small threshold.
The display unit 61 displays that the state of the furnace is in the suspended state based on the information of the state of the furnace output from the control unit 30. Specifically, when the control unit 30 determines that the suspension state is in the suspension state, the control unit 30 performs the following control: as shown in fig. 8, an image 61d indicated as "hanging occurrence" in the info box is displayed on the display unit 61 as an in-furnace abnormality alarm. In addition, in the warning lamp 62 and the buzzer 63, when the control unit 30 determines that the suspended state is established, the control unit 30 continues to notify the warning lamp 62 and the buzzer 63 as an abnormality warning in the furnace. In addition, in the notification of the warning lamp 62, the method of notification is changed by changing the color of the lighted or blinking lamp or switching between the lighting and blinking, or the like, between the case where the material is determined to be in the too-low state and the case where the material is determined to be in the suspended state. In addition, in the notification of the buzzer 63, the method of notification is changed by changing the sound or the like generated between the case where the material is determined to be in the too-low state and the case where the material is determined to be in the suspended state. The control unit 30 can switch the presence or absence of the notification of each of the display unit 61, the warning lamp 62, and the buzzer 63.
When a time exceeding a predetermined operation stop threshold has elapsed after the control unit 30 performs control to raise an abnormality alarm in the furnace, the operation of the induction furnace 100 is stopped by the control of the control unit 30. Specifically, the induction heating of the induction heating coil 20 is stopped by the control of the control unit 30.
(refractory thickness acquiring treatment)
The flow of the refractory thickness (wear degree) acquisition process performed by the control unit 30 will be described with reference to fig. 9.
In step S1, the induction furnace 100 starts induction heating of the induction heating coil 20. In step S1, the melting material M is melted by induction heating of the induction heating coil 20 wound so as to surround the outer periphery of the furnace body 10 made of a refractory. In addition, step S1 is an example of "induction heating step" of the present disclosure.
In step S2, a load resistance value of the induction heating coil 20 is acquired. The control unit 30 calculates a load resistance value of the induction heating coil 20 using the current value of the induction heating coil 20 detected by the current detection unit 40. Further, step S2 is an example of the "acquisition step" of the present disclosure.
In step S3, the lowest value of the load resistance values is acquired. In step S3, the lowest value of the load resistance values calculated (acquired) by the control unit 30 for each predetermined period, for example, each work day, is acquired. Then, the lowest value of the load resistance values obtained by the control unit 30 for each predetermined period is stored in the storage unit 50.
In step S4, the thickness (wear degree) of the refractory is obtained. In step S4, the control unit 30 obtains the thickness of the refractory (furnace body 10) as the degradation state (furnace state) of the furnace body 10 based on the load resistance values obtained in steps S2 to S3. Specifically, the control unit 30 creates a transition of the thickness of the refractory material (see fig. 5) in which the thickness of the refractory material is plotted for each predetermined period, and the thickness of the refractory material for each predetermined period is obtained based on the lowest value of the load resistance values for each predetermined period (day of operation) stored in the storage unit 50. Further, step S4 is an example of the "state acquisition step" of the present disclosure.
(in-furnace State acquisition processing)
The flow of the process of the in-furnace state acquisition process performed by the control unit 30 will be described with reference to fig. 10.
In step S11, the induction furnace 100 starts induction heating of the induction heating coil 20. In step S11, the melting material M is melted by induction heating of the induction heating coil 20 wound so as to surround the outer periphery of the furnace body 10 made of a refractory. In addition, step S11 is an example of "induction heating step" of the present disclosure.
In step S12, a load resistance value of the induction heating coil 20 is acquired. Further, step S12 is an example of the "acquisition step" of the present disclosure.
In step S13, the in-furnace state is acquired. In step S13, the control unit 30 obtains the melted state (state of the furnace) of the melted material M inside the furnace body 10 based on the load resistance value obtained in step S12. Further, step S13 is an example of the "state acquisition step" of the present disclosure.
In step S14, it is determined whether the material is too little. In step S14, as described above, the control unit 30 performs the following control: based on the decrease in the load resistance per unit time during the operation from the start of the feeding of the melting raw material M to the tapping, it is determined whether or not the melting raw material M is too small inside the furnace main body 10. When it is determined in step S14 that the material is too small, the processing step proceeds to step S15. If it is determined in step S14 that the material is not too small, the process of step S14 is repeated.
In step S15, the notification is in the material shortage state. In step S15, the notification of the material shortage state by the display unit 61, the warning lamp 62, and the buzzer 63 as described above is performed by the control of the control unit 30.
In step S16, it is determined whether or not the material shortage state continues for a predetermined time or longer. In step S16, as described above, the control unit 30 performs the following control: when the state in which the amount of the melting material M on the inner side of the furnace main body 10 is too small continues for a predetermined time or longer, the state is determined to be in the suspended state. When it is determined in step S16 that the material shortage state continues for a predetermined time or longer, the processing step proceeds to step S17. When it is determined in step S16 that the material shortage state has not been continued for the predetermined time or longer, the processing returns to step S14.
In step S17, the suspension state is notified. In step S17, the control unit 30 performs the notification of the suspension state by the display unit 61, the warning lamp 62, and the buzzer 63 as described above.
In step S18, it is determined whether or not the abnormality in the furnace has continued for a predetermined time or longer. In step S18, as described above, the control unit 30 performs the following control: it is determined whether or not a time exceeding a predetermined operation stop threshold has elapsed after the control of raising the in-furnace abnormality alarm is performed. When it is determined in step S18 that the time exceeding the predetermined operation stop threshold has elapsed after the control for raising the in-furnace abnormality alarm has been performed, and the in-furnace abnormality continues for the predetermined time or longer, the process proceeds to step S19. When it is determined in step S18 that the furnace abnormality has not continued for a predetermined time or longer, the process returns to step S14.
In step S19, the operation of the induction furnace 100 is stopped. In step S19, the operation of the induction furnace 100 is stopped under the control of the control unit 30.
(effects of the first embodiment)
In the first embodiment, the following effects can be obtained.
In the first embodiment, the state of the furnace is acquired based on the load resistance value of the induction heating coil 20. Accordingly, the control unit 30 obtains the state of the furnace based on the load resistance value of the induction heating coil 20, and thus the state of the furnace can be obtained without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
In the first embodiment, as described above, the control unit 30 performs the following control: based on the load resistance value of the induction heating coil 20, the state of the furnace including both the state of deterioration of the furnace main body 10 and the melted state of the melted material M inside the furnace main body 10 is obtained. Accordingly, even if the operator does not perform the confirmation operation of the furnace, the control unit 30 can acquire both the state of deterioration of the furnace main body 10 and the melted state of the melted material M inside the furnace main body 10. The state of deterioration of the furnace body 10 and the melted state of the melted material M inside the furnace body 10 can be obtained based on the load resistance value of the induction heating coil 20. Thus, both the state of deterioration of the furnace main body 10 and the melted state of the melted material M inside the furnace main body 10 can be obtained more easily than the case where the obtaining is performed based on different indices.
In the first embodiment, as described above, the control unit 30 obtains the state of deterioration of the furnace main body 10 based on the change in the load resistance value at every predetermined period. This makes it possible to obtain a transition in degradation of the furnace body 10 from a change in the load resistance value at every predetermined period.
In the first embodiment, as described above, the control unit 30 obtains the state of deterioration of the furnace main body 10 based on the change of the lowest value of the load resistance values at predetermined intervals, which is the change of the load resistance values at predetermined intervals. Thus, even when an abnormally high load resistance value (noise) is obtained within a predetermined period, the influence of noise can be eliminated. As a result, the deteriorated state of the furnace body 10 can be obtained with higher accuracy.
In the first embodiment, as described above, the control unit 30 obtains the melted state of the melting raw material M inside the furnace main body 10 based on the change in the load resistance value per unit time during the operation from the start of the feeding of the melting raw material M to the discharge of the liquid. This makes it possible to obtain a change in the melting state of the melting raw material M inside the furnace body 10 during the operation of the induction furnace 100.
In the first embodiment, as described above, the control unit 30 performs the following control: based on the decrease in the load resistance per unit time during the operation from the start of the feeding of the melting raw material M to the tapping, it is determined whether or not the melting raw material M is too small inside the furnace main body 10. In this way, when the control unit 30 determines that the amount of the melting raw material M inside the furnace main body 10 is too small, the melting raw material M can be efficiently melted by charging the melting raw material M. As a result, the melting raw material M in the amount of the rated capacity of the furnace main body 10 can be melted in a shorter time, and therefore an increase in the power consumption of the induction heating coil 20 can be suppressed.
In the first embodiment, as described above, the control unit 30 performs the following control: when the state in which the amount of the melting material M in the furnace main body 10 is too small continues for a predetermined time or longer, it is determined that the melting material M is in a suspended state in which the melting material M does not fall due to the arc formation in the furnace main body 10. Thus, the suspended state can be detected by the control unit 30 without visual confirmation by the operator. As a result, when the state of the furnace is the suspended state, the worker can promptly perform the process of releasing the suspended state.
In the first embodiment, as described above, the control unit 30 outputs the acquired information on the state of the furnace. The induction furnace 100 further includes a display unit 61, a warning lamp 62, and a buzzer 63 for notifying the state of the furnace based on the information of the state of the furnace output from the control unit 30. Thus, the operator can easily grasp the state of the furnace by the notification of the display portion 61, the warning lamp 62, and the buzzer 63.
Second embodiment
The structure of an induction furnace 200 according to a second embodiment of the present invention will be described with reference to fig. 11 to 13. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the second embodiment, as shown in fig. 11, an induction furnace 200 includes an induction heating coil 220 and a detection unit 240. The induction heating coil 220 includes induction heating coils 21, 22, 23, 24, 25, 26, 27, and 28 arranged side by side along the depth direction (Y direction) of the furnace main body 10. The induction heating coils 21, 22, 23, 24, 25, 26, 27, and 28 are examples of "a plurality of induction heating coils" in the present disclosure.
The detection unit 240 includes detectors 41, 42, 43, 44, 45, 46, 47, and 48 provided corresponding to the induction heating coils 21, 22, 23, 24, 25, 26, 27, and 28, respectively.
The control unit 30 of the induction furnace 200 acquires the load resistance value of each of the induction heating coils 21 to 28. The control unit 30 of the induction furnace 200 obtains the load resistance value of the entire induction heating coil 220 from the load resistance values of the respective induction heating coils 21 to 28. This allows obtaining a degraded state of the position of the furnace main body 10 corresponding to the position of each of the induction heating coils 21 to 28 in the depth direction (Y direction) and a melted state of the melted material M inside the furnace main body 10, and also allows obtaining a degraded state of the entire furnace main body 10 and a melted state of the melted material M inside the furnace main body 10.
In the second embodiment, the control unit 30 performs the following control: based on the load resistance values of the respective induction heating coils 21 to 28, the degraded state of the portion of the furnace main body 10 corresponding to the position of the respective induction heating coils 21 to 28 in the depth direction (Y direction) is obtained.
As shown in fig. 12, when the thickness of the portion of the furnace main body 10 (refractory) corresponding to the induction heating coil 26 is reduced compared to other portions by localized wear K occurring at the portion corresponding to the induction heating coil 26 on the inner wall 10c of the furnace main body 10, the distance between the melt Ma and the induction heating coil 26 is reduced compared to other portions. Therefore, the load resistance value of the induction heating coil 26 is larger than that of the induction heating coils 21 to 26 and 28. This makes it possible to determine the position in the depth direction (Y direction) where the localized wear K occurs.
In the second embodiment, the control unit 30 performs the following control: based on the load resistance values of the respective induction heating coils 21 to 28, the melted state of the melting raw material M inside the furnace main body 10 corresponding to the position of the respective induction heating coils 21 to 28 in the depth direction (Y direction) is obtained.
The load resistance value of the portion where the melting raw material Mb is in the suspended state is larger than the load resistance value of the portion where the melting raw material M is in the melt Ma. Specifically, in the example shown in fig. 13, the load resistance value of the induction heating coil 22 is larger than the load resistance values of the induction heating coils 24 to 28. The load resistance value of the region A1 formed in the air between the portion where the molten raw material Mb is in the suspended state and the portion where the molten raw material M is in the molten material Ma becomes smaller than the load resistance value of the portion where the molten raw material M is in the molten material Ma. The load resistance value of the region A2 of the air formed on the Y1 direction side of the portion where the molten material Mb is in the suspended state is smaller than the load resistance value of the portion where the molten material M is in the molten material Ma. Specifically, in the example shown in fig. 13, the load resistance values of the induction heating coils 21 and 23 are smaller than the load resistance values of the induction heating coils 24 to 28.
Further, whether or not the molten material M is a melt Ma can be estimated based on the weight of the molten material M charged into the furnace body 10 and the amount of power (amount of energy supplied) used. Specifically, the state of the melting raw material M can be estimated by calculating the temperature of the melting raw material M from a value obtained by dividing the weight of the melting raw material M by the amount of power used and a value of the physical property of the melting raw material M. Thereby, the control unit 30 can estimate the melted state of the melting material M for the position of each of the induction heating coils 21 to 28 in the depth direction (Y direction).
The other structures of the second embodiment are the same as those of the first embodiment described above.
(effects of the second embodiment)
In the second embodiment, the following effects can be obtained.
In the second embodiment, the state of the furnace can be obtained without performing a confirmation operation such as visual observation or measurement by the operator, as in the first embodiment.
In the second embodiment, as described above, the induction heating coils 220 include the induction heating coils 21 to 28 arranged side by side in the depth direction (Y direction) of the furnace main body 10. The control unit 30 also performs the following control: based on the load resistance values of the induction heating coils 21 to 28, both the degraded state of the portion of the furnace main body 10 corresponding to the position of the induction heating coils 21 to 28 in the depth direction and the melted state of the melting raw material M inside the furnace main body 10 corresponding to the position of the induction heating coils 21 to 28 in the depth direction are obtained. Accordingly, the state of deterioration of the portion of the furnace main body 10 corresponding to the position of each of the induction heating coils 21 to 28 in the depth direction is obtained, and therefore, compared with the case where the state of deterioration of the entire furnace main body 10 is obtained based on the load resistance value of 1 induction heating coil, the local wear K and the occurrence portion of the local wear K occurring in the furnace main body 10 can be easily found. Further, since the melted state of the melting material M inside the furnace main body 10 corresponding to the position of each of the induction heating coils 21 to 28 in the depth direction is obtained, the change in the melted state of the melting material M in the depth direction can be obtained. As a result, abnormal portions such as a suspended state inside the furnace body 10 can be easily found.
Other effects of the second embodiment are the same as those of the first embodiment described above.
Modification example
The presently disclosed embodiments are considered in all respects to be illustrative and not restrictive. The scope of the present invention is shown by the claims rather than the description of the above embodiments, and also includes all modifications (variations) within the meaning and scope equivalent to the claims.
For example, in the first and second embodiments described above, examples are shown in which the following control is performed: based on the load resistance value of the induction heating coil 20, the state of the furnace including both the state of deterioration of the furnace main body 10 and the melted state of the melted material M inside the furnace main body 10 is obtained, but the present invention is not limited to this. For example, the control unit may acquire only the state of deterioration of the furnace main body unit as the state of the furnace based on the load resistance value of the induction heating coil. The control unit may acquire only the molten state of the melting material inside the furnace main body as the furnace state based on the load resistance value of the induction heating coil.
In the first and second embodiments, the control unit 30 has been described as an example of acquiring the state of deterioration of the furnace main body 10 based on the change in the load resistance value every predetermined period, but the present invention is not limited to this. In the present invention, the state of deterioration of the furnace body may be obtained by comparing the load resistance value with a predetermined threshold value. In this case, the notification unit may notify the load resistance value to a predetermined threshold value by the control unit when it is determined that the state of deterioration of the furnace main body unit exceeds the criterion of replacement (rebuilding of the furnace).
In the first and second embodiments described above, the control unit 30 has been described as an example of acquiring the state of deterioration of the furnace main body 10 based on the change of the lowest value of the load resistance values every predetermined period, which is the change of the load resistance values every predetermined period, but the present invention is not limited to this. In the present invention, the control unit may acquire a state of deterioration of the furnace main body unit based on a change in an average value of the load resistance values at every predetermined period.
In the first and second embodiments, the control unit 30 performs the following control: whether the amount of the melting raw material M is too small in the furnace main body 10 is determined based on a decrease in the load resistance per unit time during the operation from the start of the feeding of the melting raw material M to the tapping, but the present invention is not limited thereto. In the present invention, the control unit may perform the following control: based on the load resistance value with respect to the elapsed time from the start of feeding the melting material, it is determined whether or not the melting material is in a state of being too small inside the furnace body.
In the first and second embodiments, the control unit 30 performs the following control: when the state in which the amount of the melting raw material M in the furnace main body 10 is too small continues for a predetermined time or longer, the state is determined to be in the suspended state, but the present invention is not limited to this. In the present invention, the control unit may independently determine a state in which the amount of molten raw material in the furnace body is too small and a state in which the molten raw material is suspended.
In the second embodiment, the control unit 30 performs the following control: the degradation state of the portion of the furnace main body 10 corresponding to the position of each of the induction heating coils 21 to 28 in the depth direction and the melting state of the melting raw material M inside the furnace main body 10 corresponding to the position of each of the induction heating coils 21 to 28 in the depth direction are both obtained, but the present invention is not limited thereto. In the present invention, the control unit may acquire only a degraded state of a portion of the furnace main body portion corresponding to a position of each of the plurality of induction heating coils in the depth direction. Further, the control unit may acquire only the melted state of the melted material inside the furnace body unit corresponding to the position of each of the plurality of induction heating coils in the depth direction.
In the second embodiment, the induction furnace 200 is shown as an example in which 8 coils (induction heating coils 21 to 28) are arranged side by side in the depth direction (Y direction) of the furnace main body 10, but the present invention is not limited to this. In the present invention, the number of induction heating coils arranged side by side in the depth direction of the furnace main body may be 2 or more and 7 or less, or 9 or more.
In the first and second embodiments, the induction furnace 100 is shown as having the display unit 61, the warning lamp 62, and the buzzer 63 for notifying the state of the furnace based on the information of the state of the furnace output from the control unit 30. In the present invention, information on the state of the furnace output from the control unit may be acquired by an information terminal such as a PC (Personal Computer: personal computer), a tablet terminal, or a smart phone, which is provided separately from the induction furnace, and the state of the furnace may be notified by the information terminal provided separately from the induction furnace.
In the first and second embodiments, the refractory thickness (wear degree) acquiring process and the furnace state acquiring process according to the present invention are described using a flow-driven flowchart in which the processes are sequentially performed according to the process flow for convenience of explanation, but the present invention is not limited to this. In the present invention, the processing operation in the refractory thickness acquisition process and the in-furnace state acquisition process may be performed by an Event-Driven (Event Driven) process that performs the processing for each Event. In this case, the processing operation in the refractory thickness acquisition process and the furnace interior state acquisition process may be performed by a complete event-driven type or by a combination of event-driven and flow-driven types.
In the first and second embodiments described above, the control unit 30 has been described as an example in which the deterioration of the furnace main body 10 due to wear is obtained as the state of deterioration of the furnace main body 10, but the present invention is not limited to this. In the present invention, the control unit may acquire degradation such as cracks, other than abrasion, as the degradation state of the furnace main body unit.
In the first and second embodiments, the example of acquiring the state of the furnace based on the load resistance value of the induction heating coil 20 is shown, but the present invention is not limited to this. In the present invention, the state of the furnace such as the deteriorated state of the furnace main body portion and the melted state of the melted material inside the furnace main body portion may be obtained based on the voltage of the induction heating coil. In this case, the state of the furnace can be acquired by the control unit based on the voltage of the induction heating coil, and thus the state of the furnace can be acquired without performing a confirmation operation such as visual observation or measurement of the furnace by an operator.
Claims (11)
1. An induction furnace is provided with:
a furnace main body part formed of a refractory material, the furnace main body part being internally charged with a melting raw material;
an induction heating coil wound so as to surround the outer periphery of the furnace body, the induction heating coil being configured to melt the melting raw material; and
And a control unit that performs control to acquire the state of the furnace based on the load resistance value or the voltage of the induction heating coil.
2. The induction furnace of claim 1, wherein,
the control unit performs the following control: based on the load resistance value of the induction heating coil, a state of the furnace including at least one of a state of deterioration of the furnace main body portion and a melted state of the melted material inside the furnace main body portion is obtained.
3. The induction furnace of claim 1, wherein,
the control unit obtains a state of deterioration of the furnace body unit based on a change in the load resistance value at every predetermined period.
4. An induction furnace according to claim 3, wherein,
the control unit obtains a state of deterioration of the furnace main body unit based on a change in the lowest value of the load resistance values every predetermined period, which is a change in the load resistance values every predetermined period.
5. The induction furnace of claim 1, wherein,
the control unit obtains a melted state of the melted material inside the furnace body based on a change in the load resistance value per unit time during an operation from the start of feeding the melted material to the discharge of the melted material.
6. The induction furnace of claim 5, wherein the induction furnace comprises a furnace body,
the control unit performs the following control: based on the decrease in the load resistance per unit time during the operation from the start of the feeding of the melting material to the discharge of the melting material, it is determined whether or not the melting material is in a state of being too small inside the furnace body.
7. The induction furnace of claim 6, wherein,
the control unit performs the following control: when the state in which the amount of the melting material in the furnace main body portion is too small continues for a predetermined time or longer, it is determined that the melting material is in a suspended state in which the melting material does not fall due to the arc formation of the melting material in the furnace main body portion.
8. The induction furnace of claim 1, wherein,
the control unit performs the following control: based on the load resistance value of the induction heating coil, a state of the furnace including both a state of deterioration of the furnace main body portion and a melted state of the melted material inside the furnace main body portion is obtained.
9. The induction furnace of claim 1, wherein,
the induction heating coil includes a plurality of induction heating coils arranged side by side along a depth direction of the furnace main body portion,
The control unit performs the following control: and acquiring at least one of a degraded state of a portion of the furnace main body portion corresponding to a position of each of the plurality of induction heating coils in the depth direction and a melted state of the melting raw material inside the furnace main body portion corresponding to a position of each of the plurality of induction heating coils in the depth direction based on the load resistance value of each of the plurality of induction heating coils.
10. The induction furnace according to any one of claims 1 to 9, wherein,
the control section outputs the acquired information of the state of the furnace,
the induction furnace further includes a notification unit that notifies the state of the furnace based on the information of the state of the furnace output from the control unit.
11. A state acquisition method of an induction furnace comprises the following steps:
an induction heating step of melting a melting material by induction heating of an induction heating coil wound so as to surround an outer periphery of a furnace main body portion made of a refractory;
an acquisition step of acquiring a load resistance value of the induction heating coil; and
A state acquisition step of acquiring a state of the furnace based on the load resistance value acquired in the acquisition step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022088627A JP2023176374A (en) | 2022-05-31 | 2022-05-31 | Induction furnace and induction furnace state acquisition method |
| JP2022-088627 | 2022-05-31 |
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| Publication Number | Publication Date |
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| CN117146588A true CN117146588A (en) | 2023-12-01 |
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|---|---|---|---|
| CN202310326286.1A Pending CN117146588A (en) | 2022-05-31 | 2023-03-30 | Induction furnace and method for acquiring state of induction furnace |
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| Country | Link |
|---|---|
| JP (1) | JP2023176374A (en) |
| CN (1) | CN117146588A (en) |
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2022
- 2022-05-31 JP JP2022088627A patent/JP2023176374A/en active Pending
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- 2023-03-30 CN CN202310326286.1A patent/CN117146588A/en active Pending
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