CN115198085A - Electric radiant tube heating three-phase pulse control device and heat treatment furnace - Google Patents
Electric radiant tube heating three-phase pulse control device and heat treatment furnace Download PDFInfo
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- CN115198085A CN115198085A CN202210819176.4A CN202210819176A CN115198085A CN 115198085 A CN115198085 A CN 115198085A CN 202210819176 A CN202210819176 A CN 202210819176A CN 115198085 A CN115198085 A CN 115198085A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 77
- 230000000712 assembly Effects 0.000 claims abstract description 15
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- 230000005855 radiation Effects 0.000 claims description 72
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 238000005192 partition Methods 0.000 description 12
- 238000005485 electric heating Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
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Abstract
The invention relates to an electric radiant tube heating three-phase pulse control device and a heat treatment furnace, wherein the electric radiant tube heating three-phase pulse control device at least comprises three electric radiant assemblies, the three electric radiant assemblies are respectively arranged on a first circuit, a second circuit and a third circuit, the first circuit, the second circuit and the third circuit are connected with three-phase electricity, a central line is led out from the connecting position of the first circuit, the second circuit and the third circuit, and the central line is grounded. The invention not only gives consideration to the process requirements of temperature control sensitivity and temperature control precision, but also reduces the investment, and is suitable for the use of ultra-large heat treatment furnaces.
Description
Technical Field
The invention relates to the field of heat treatment furnaces, in particular to an electric radiant tube heating three-phase pulse control device and a heat treatment furnace.
Background
The electric radiant tube is heating equipment which utilizes an electric heating element arranged in a straight sleeve radiant tube as a heating carrier and transfers heat to materials and a hearth in a radiation heat transfer mode through the radiant tube, is mainly used for a non-oxidation heat treatment furnace with protective atmosphere and is generally arranged on the upper side and the lower side or the left side and the right side of the materials, and the radiant tube is vertical to the running direction of the materials and is horizontally or vertically arranged.
Compared with the common gas radiant tube heating, the electric radiant tube heating has the following advantages: 1. the temperature uniformity of the electric radiant tube in the length direction of the radiant tube is far better than that of a gas radiant tube; 2. the electric heating has no heat loss of exhaust smoke, and the relative heat efficiency is higher; 3. the electric radiant tube is convenient to heat, operate and maintain, the operating environment is far better than that of fuel gas, and the investment is saved; 4. the heat treatment workshop using electric heating has no environmental protection discharge problem and the like. The advantages enable the electric radiant tube heating to be widely applied to some fields needing high-quality heat treatment, and further to be popularized and applied.
The conventional heat treatment furnace using the electric radiant tubes for heating has small yield, the heat treatment furnace is generally small and exquisite, the power configuration of the electric radiant tubes is small, and in order to realize uniform control of the furnace temperature, uniform heating and control of the furnace temperature can be realized by refining enough temperature partitions and configuring denser electric radiant tubes.
With the development of large-scale special heat treatment and the maturation of electric radiant tube heating technology in recent years, the adoption of ultra-large heat treatment furnaces has become an option for more and more heat treatment plants in consideration of the environmental limitation of gas heating and other factors. However, with the increase of the capacity of the heat treatment furnace, the furnace length and the furnace width of the heat treatment furnace are continuously increased, the required electric power is also greatly increased, and the number of the required electric radiant tubes is greatly increased, but the prior art of the ultra-large heat treatment furnace cannot meet the control requirements on the temperature control precision and the adjustment sensitivity of the hearth, so that the process requirements of both the temperature control sensitivity and the temperature control precision can be met, and the investment can be reduced.
Therefore, the inventor provides an electric radiant tube heating three-phase pulse control device and a heat treatment furnace by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide an electric radiant tube heating three-phase pulse control device and a heat treatment furnace, which solve the furnace temperature control process requirement of an ultra-large heat treatment furnace heated by an electric radiant tube, not only keep the proportional control function of the electric radiant tube, but also have the three-phase independent pulse control function, have simple system configuration, can ensure the process requirements of furnace temperature uniformity, temperature control sensitivity and the like, and can greatly save investment and reduce maintenance amount.
The purpose of the invention can be realized by adopting the following scheme:
the invention provides an electric radiant tube heating three-phase pulse control device which at least comprises three electric radiation assemblies, wherein the three electric radiation assemblies are respectively arranged on a first circuit, a second circuit and a third circuit, the first circuit, the second circuit and the third circuit are connected with three-phase electricity, a central line is led out from the connection position of the first circuit, the second circuit and the third circuit, and the central line is grounded.
In a preferred embodiment of the present invention, three phase power regulators are disposed on the first line, the second line, the third line and the central line, and are used for respectively controlling the operating states of the three electric radiation assemblies.
In a preferred embodiment of the present invention, the three-phase power adjusting device has three-phase electrical contacts respectively connected to the first line, the second line, and the third line, and a ground contact of the three-phase power adjusting device is connected to the center line.
In a preferred embodiment of the present invention, switches are disposed on the first line, the second line, and the third line, and are used for respectively controlling on-off states of the first line, the second line, and the third line.
In a preferred embodiment of the present invention, the switch is disposed inside the three-phase power regulator.
In a preferred embodiment of the present invention, each of the electric radiation assemblies includes an electric radiation tube, each of the electric radiation tubes is provided with a first electric contact and a second electric contact, the first electric contact of each of the electric radiation tubes is connected to three-phase power, and the second electric contact of each of the electric radiation tubes is grounded.
In a preferred embodiment of the present invention, each of the electric radiation assemblies includes a plurality of electric radiation tubes, each of the electric radiation tubes is provided with a first electric contact and a second electric contact, the plurality of electric radiation tubes in each of the electric radiation assemblies are connected in parallel, the first electric contact of each of the electric radiation tubes is connected to three-phase power, and the second electric contact of each of the electric radiation tubes is directly grounded or the second electric contact of each of the electric radiation tubes is connected to ground.
In a preferred embodiment of the present invention, a plurality of the electric radiant tubes connected in parallel are arranged at intervals.
In a preferred embodiment of the present invention, each of the electric radiation elements includes a plurality of electric radiation tubes, and the plurality of electric radiation tubes in each of the electric radiation elements are connected in series.
In a preferred embodiment of the present invention, the resistances of the plurality of electric radiation tubes connected in series in each of the electric radiation elements are the same.
The invention provides a heat treatment furnace, which comprises the electric radiant tube heating three-phase pulse control device, wherein a plurality of temperature zones are formed in a hearth of the heat treatment furnace, and the electric radiant tube heating three-phase pulse control device is arranged in the temperature zones.
From the above, the electric radiant tube heating three-phase pulse control device and the heat treatment furnace of the invention have the characteristics and advantages that: the first line, the second line, the third line and the center line form a three-phase Y-shaped grounding circuit with the center line, the first line, the second line and the third line are respectively provided with the electric radiation components, and the independent conduction or disconnection of any line can not influence the on-off state of other lines, so that the independent control of each electric radiation component can be realized, the requirements of furnace temperature uniformity and temperature control sensitivity can be met, the investment can be greatly saved, and the maintenance amount can be greatly reduced.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: the invention relates to a principle structure chart of an electric radiant tube heating three-phase pulse control device.
FIG. 2: is one of the structural schematic diagrams of the electric radiant tube heating three-phase pulse control device of the present invention.
FIG. 3: the second structure of the three-phase pulse control device for heating by electric radiant tube of the present invention is shown in the figure.
FIG. 4: is one of the connection schematic diagrams of the contact of the electrical radiant tube heating three-phase pulse control device of the present invention.
FIG. 5: the third structural schematic diagram of the electric radiant tube heating three-phase pulse control device is shown.
FIG. 6: the second schematic connection diagram of the contact of the electric radiant tube heating three-phase pulse control device of the present invention.
FIG. 7: the fourth structure of the electric radiant tube heating three-phase pulse control device is shown in the figure.
FIG. 8: the third connection diagram of the contact of the electric radiant tube heating three-phase pulse control device of the present invention is shown.
FIG. 9: the structure of the electric radiant tube heating three-phase pulse control device is schematically illustrated in the fifth embodiment.
The reference numbers in the invention are:
1. an electric radiation component; 101. An electric radiant tube;
1011. a first electrical contact; 1012. A second electrical contact;
2. a first line; 3. A second line;
4. a third line; 5. A centerline;
6. a three-phase power regulator; 7. A switch;
8. and (4) temperature partition.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Implementation mode one
As shown in fig. 1, the present invention provides an electric radiant tube heating three-phase pulse control device, which at least comprises three electric radiation assemblies 1, wherein the three electric radiation assemblies 1 are respectively arranged on a first line 2, a second line 3 and a third line 4, the first line 2, the second line 3 and the third line 4 are connected with three-phase power, a central line 5 is led out from the connection position of the first line 2, the second line 3 and the third line 4, and the central line 5 is grounded.
According to the invention, the first line 2, the second line 3, the third line 4 and the central line 5 form a Y-shaped power connection circuit of three-phase electricity, and the first line 2, the second line 3 and the third line 4 are respectively provided with the electric radiation components 1, and the independent connection or disconnection of any one of the U, V and W can not influence the connection or disconnection state of the other two lines, so that the independent control of each electric radiation component can be realized (namely the independent connection or disconnection of the U-N, V-N and W-N circuits can be realized), the requirements of uniformity of furnace temperature and sensitivity of temperature control can be ensured, the investment can be greatly saved, and the maintenance amount can be greatly reduced.
Further, the three-phase power can be, but is not limited to, a 380V three-phase alternating current power supply, and N is a grounding electrode.
Further, the first line 2, the second line 3, the third line 4 and the central line 5 may be, but not limited to, cables, which may be multi-core cables or single-core cables.
In an alternative embodiment of the present invention, as shown in fig. 2, three-phase power regulators 6 are disposed on the first line 2, the second line 3, the third line 4 and the center line 5, three-phase power contacts of the three-phase power regulators 6 are respectively connected to the first line 2, the second line 3 and the third line 4, a ground contact of the three-phase power regulators 6 is connected to the center line 5, and the three-phase power regulators 6 can respectively control the operating states of the three electric radiation assemblies 1. In the actual working process, according to the control requirements of the furnace cavity heat load and the furnace temperature uniformity of the heat treatment furnace, the power on/off of each single phase of the three-phase power regulator 6 and the single-phase current or voltage can be controlled, so that the independent power on/off or variable power output control of each electric radiation component in a three-phase loop (namely U-N, V-N and W-N loops) is realized, and the process that one three-phase power regulator 6 can control the pulse or independent proportional adjustment of three electric radiation components is further achieved. In addition, when the three-phase loop is controlled to be synchronously switched on and off or the current or the voltage is synchronously regulated, the function of synchronously regulating the proportion of each electric radiation component can be realized.
Further, the three-phase power regulator 6 may be, but is not limited to, a thyristor power regulator, which has a Y-type wiring function with a center line grounded, can realize independent on-off of three phase lines, and has multiple control modes such as phase angle, voltage, current or power; the three-phase power regulator 6 has a bus communication function, so that a large number of communication cables can be reduced, and system configuration is simplified.
In an alternative embodiment of the present invention, as shown in fig. 2, the first line 2, the second line 3 and the third line 4 are provided with switches 7, and the on-off states of the first line 2, the second line 3 and the third line 4 can be controlled respectively through the switches 7.
Further, the switch 7 may be, but is not limited to, a fuse switch. Of course, a switch form that the fusing switch is connected with the air switch in series can be adopted, and the remote quick-switching protection can be realized.
Furthermore, the switch 7 may be disposed inside the three-phase power regulator 6 (i.e., a structure in which the switch 7 is built-in is adopted), so as to integrate the switch 7 and the three-phase power regulator 6.
In an alternative embodiment of the present invention, as shown in fig. 3 and 4, each electric radiation assembly 1 includes one electric radiation tube 101, each electric radiation tube 101 is provided with a first electric contact 1011 and a second electric contact 1012, and the first electric contact 1011 of each electric radiation tube 101 is connected with three-phase electricity, and the second electric contact 1012 of each electric radiation tube 101 is grounded.
In this embodiment, the electric radiant tube heating three-phase pulse control device is arranged in a temperature partition 8 in the hearth of the heat treatment furnace, three electric radiant tubes 101 are arranged in the temperature partition 8, U, V and W are respectively connected to the three-phase electric contacts of the three-phase power regulator 6, and N is connected to the grounding point of the three-phase power regulator 6. In the control process, the electric power required to be input by the corresponding temperature partition 8 can be obtained according to parameters such as the yield of the heat treatment furnace, the product specification, the current situation of the furnace temperature and the like, or the difference between the actually measured value of the furnace temperature and the target value is directly detected by the thermocouples of the temperature partition 8, so that the voltage or the current output by the three-phase power regulator 6 can be controlled, the independent on-off or proportional adjustment of each electric radiant tube 101 on the three lines can be realized, and the synchronous on-off or proportional adjustment of each electric radiant tube 101 on the three lines can also be realized. The pulse control of the output power of the three electric radiant tubes 101 according to time can be realized by one three-phase power regulator 6, and the proportion regulation of the variable power output of each electric radiant tube 101 can also be realized.
In an alternative embodiment of the present invention, as shown in fig. 5 to 9, each electric radiation assembly 1 includes a plurality of electric radiation tubes 101, each electric radiation tube 101 is provided with a first electric contact 1011 and a second electric contact 1012, the plurality of electric radiation tubes 101 in each electric radiation assembly 1 are connected in parallel, the first electric contact 1011 of each electric radiation tube 101 is connected with three-phase power, and the second electric contact 1012 of each electric radiation tube 101 is directly connected with ground. Of course, the second electrical contact 1012 of each electric radiation tube 101 may be connected to ground. When a mode that a plurality of electric radiant tubes 101 are connected in parallel is adopted in each electric radiant assembly 1, each electric radiant tube 101 can be arranged on the same side of the material, and can also be arranged in an upper-lower arrangement mode or a left-right arrangement mode, namely: the electric radiant tubes 101 are arranged at the upper, lower, left, right, etc. positions of the material in one temperature partition 8.
In an embodiment of the present invention, as shown in fig. 5 and 6, each electric radiation assembly 1 comprises two electric radiation tubes 101. In this embodiment, the number of the electric radiant tubes 101 disposed in one temperature zone 8 is six, U, V, W are respectively connected to the three-phase electric contacts of the three-phase power regulator 6, and N is connected to the grounding point of the three-phase power regulator 6. In the control process, the electric power required to be input by the temperature partition 8 can be calculated according to parameters such as the yield of the heat treatment furnace, the product specification, the current situation of the furnace temperature and the like, or the difference between the actually measured furnace temperature and the target value is detected by the thermocouples of the temperature partition 8, so that the voltage or the current output by the three-phase power regulator 6 can be controlled, the independent on-off or proportional adjustment of each electric radiant tube 101 on three lines can be realized, the same-step on-off or proportional adjustment of each electric radiant tube 101 on the three lines can also be realized, the independent on-off or proportional adjustment of two-by-two combination of the six electric radiant tubes can be further controlled, and the synchronous on-off or synchronous proportional adjustment of the six electric radiant tubes can also be controlled. Through the three-phase power regulator 6, the interval pulse control of the time output power of the six electric radiant tubes 101 in a pairwise combination mode can be realized, and the proportion regulation of the variable power output can also be realized. It should be noted that, in order to guarantee temperature uniformity in the furnace, do not influence each other between the electric radiant tube 101 that opens and stops in step during pulse control, enlarge the scope that pulse control covered as far as possible, simultaneously for the wiring convenience, interval arrangement between two parallelly connected electric radiant tubes 101 in same phase line, in addition, can also make the control range of pulse wider, the control by temperature change precision is higher, and it is better to adjust the sensitivity.
In another embodiment of the present invention, as shown in fig. 7 and 8, each electric radiation assembly 1 comprises three electric radiation tubes 101. In this embodiment, the number of the electric radiant tubes 101 disposed in one temperature zone 8 is nine, U, V, W are respectively connected to the three-phase electric contacts of the three-phase power regulator 6, and N is connected to the grounding point of the three-phase power regulator 6. In the control process, the electric power required to be input by the temperature partition 8 can be calculated according to parameters such as the yield of the heat treatment furnace, the product specification, the current situation of the furnace temperature and the like, or the difference between the measured value of the furnace temperature and the target value is detected by the thermocouples of the temperature partition 8, so that the voltage or the current output by the three-phase power regulator 6 can be controlled, the independent on-off or proportional adjustment of each electric radiant tube 101 on three lines can be realized, the same step on-off or proportional adjustment of each electric radiant tube 101 on the three lines can be realized, the independent on-off or proportional adjustment of one group of three electric radiant tubes in nine electric radiant tubes can be controlled, and the synchronous on-off or synchronous proportional adjustment of the nine electric radiant tubes can be controlled. Through one three-phase power regulator 6, the interval pulse control of the nine electric radiant tubes 101 in a three-tube group mode according to the time output power can be realized, and the proportion regulation of the variable power output can also be realized. It should be noted that, in order to guarantee temperature uniformity in the furnace, the electric radiant tubes 101 started and stopped synchronously during pulse control do not influence each other, and the range covered by pulse control is expanded as much as possible, and simultaneously, for the convenience of wiring, the interval arrangement is carried out between the three electric radiant tubes 101 connected in parallel in the same phase line, and in addition, the control range that can also make the pulse is wider, the temperature control precision is higher, and the regulation sensitivity is better.
In an alternative embodiment of the present invention, each electric radiation assembly 1 includes a plurality of electric radiation tubes 101, and the plurality of electric radiation tubes 101 in each electric radiation assembly 1 are connected in series, so as to satisfy the temperature control requirements of the different temperature partitions 8 by arranging the plurality of electric radiation tubes 101 in series.
Further, the resistances of the plurality of electric radiation tubes 101 connected in series in each electric radiation assembly 1 are the same.
In an alternative embodiment of the present invention, the electric radiant tube 101 may be, but is not limited to, a straight jacket radiant tube, inside of which an electric heating element, an insulating support and a heat insulating protective lining are disposed, the insulating support being supported between the heat insulating protective lining and the electric heating element; the electric heating element can be, but is not limited to, a resistance band, a resistance wire or a resistance rod, and can adopt various structural forms, such as, but not limited to, a squirrel cage structure or a wire winding structure.
The electric radiant tube heating three-phase pulse control device has the characteristics and advantages that:
the electric radiant tube heating three-phase pulse control device meets the furnace temperature control process requirement of a large heat treatment furnace heated by an electric radiant tube 101, can retain the proportional control function of the electric radiant tube 101, and has the three-phase independent pulse control function; the furnace temperature uniformity of the large heat treatment furnace can be controlled to be less than or equal to 1 ℃, the temperature control response speed is high, the equipment investment can be greatly reduced, and compared with the prior art, the method has the advantages of higher temperature uniformity adjustment and temperature control sensitivity; in the implementation mode of the invention, the number of the used power regulators and the use amount of electric quantity are both greatly reduced, the structural complexity is greatly reduced, and further, the cost investment is greatly reduced, thus the invention is suitable for being used in ultra-large heat treatment furnaces.
Second embodiment
The invention provides a heat treatment furnace, which comprises the electric radiant tube heating three-phase pulse control device, wherein a plurality of temperature subareas 8 are formed in a hearth of the heat treatment furnace, and the electric radiant tube heating three-phase pulse control device is arranged in the temperature subareas 8.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (11)
1. The utility model provides an electric radiant tube heating three-phase pulse controlling means, its characterized in that, electric radiant tube heating three-phase pulse controlling means includes three electric radiation component at least, and is three electric radiation component sets up respectively on first circuit, second circuit and third circuit, just first circuit the second circuit with the third circuit connects the three-phase electricity first circuit the second circuit with the central line is drawn forth to the hookup location of third circuit, central line ground connection.
2. The electric radiant tube heating three-phase pulse control device as claimed in claim 1, wherein three-phase power regulators are provided on the first line, the second line, the third line and the central line for controlling the operating states of the three electric radiant modules respectively.
3. The apparatus of claim 2 wherein the three phase power regulator is connected to the first, second and third lines at three phase electrical contacts, and wherein the three phase power regulator is connected to the ground at the ground contact and the centerline at the ground contact.
4. The electric radiant tube heating three-phase pulse control device as claimed in claim 2 or 3, wherein the first line, the second line and the third line are provided with switches for controlling the on-off states of the first line, the second line and the third line respectively.
5. The apparatus of claim 4 wherein the switch is disposed within the three phase power conditioner.
6. The electric radiant tube heating three-phase pulse control device as claimed in any one of claims 1 to 3, wherein each electric radiant assembly comprises an electric radiant tube, each electric radiant tube is provided with a first electric contact and a second electric contact, the first electric contact of each electric radiant tube is connected with three-phase electricity, and the second electric contact of each electric radiant tube is grounded.
7. The apparatus as claimed in any one of claims 1 to 3, wherein each of the electric radiation assemblies comprises a plurality of electric radiation tubes, each of the electric radiation tubes is provided with a first electric contact and a second electric contact, the plurality of electric radiation tubes in each of the electric radiation assemblies are connected in parallel, the first electric contact of each of the electric radiation tubes is connected to three-phase power, and the second electric contact of each of the electric radiation tubes is directly grounded or the second electric contact of each of the electric radiation tubes is connected to ground.
8. The apparatus of claim 7, wherein a plurality of said electric radiant tubes connected in parallel are spaced apart.
9. The apparatus according to any of claims 1-3, wherein each of said electric radiation assemblies comprises a plurality of electric radiation tubes, and wherein said plurality of electric radiation tubes of each of said electric radiation assemblies are connected in series.
10. The apparatus of claim 9, wherein the resistances of the plurality of series-connected electric radiant tubes in each of the electric radiant modules are the same.
11. A heat treatment furnace comprising the electric radiant tube heating three-phase pulse control device as claimed in any one of claims 1 to 10, wherein a plurality of temperature zones are formed in a furnace chamber of the heat treatment furnace, and the electric radiant tube heating three-phase pulse control device is disposed in the temperature zones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819176.4A CN115198085B (en) | 2022-07-13 | 2022-07-13 | Three-phase pulse control device for heating electric radiant tube and heat treatment furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819176.4A CN115198085B (en) | 2022-07-13 | 2022-07-13 | Three-phase pulse control device for heating electric radiant tube and heat treatment furnace |
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| CN115198085A true CN115198085A (en) | 2022-10-18 |
| CN115198085B CN115198085B (en) | 2024-01-30 |
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2022
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