CN112583286B - Control method for flywheel tube of high-power induction melting furnace - Google Patents
Control method for flywheel tube of high-power induction melting furnace Download PDFInfo
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- CN112583286B CN112583286B CN202011479578.1A CN202011479578A CN112583286B CN 112583286 B CN112583286 B CN 112583286B CN 202011479578 A CN202011479578 A CN 202011479578A CN 112583286 B CN112583286 B CN 112583286B
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- 230000006698 induction Effects 0.000 title claims abstract description 19
- 238000002844 melting Methods 0.000 title claims abstract description 19
- 230000008018 melting Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 50
- 238000007493 shaping process Methods 0.000 claims description 26
- 230000005669 field effect Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000013641 positive control Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a control method of a freewheeling tube of a high-power induction melting furnace, which comprises the steps of connecting a freewheeling tube in a high-end rectifying bridge loop in a freewheeling tube control circuit, connecting a KK type fast thyristor in a low-end rectifying bridge loop, wherein the freewheeling tube in the high-end rectifying bridge loop is always connected when the high-end rectifying bridge is started, the KK type fast thyristor in the low-end rectifying bridge loop is controlled by a trigger circuit, and when the intermediate frequency voltage rises to a set value, the trigger circuit generates trigger pulse to trigger, and the KK type fast thyristor is conducted to intervene in a main circuit to play a role in protecting the rectifying tube. The invention has stable starting, low control cost and long service life.
Description
Technical Field
The invention relates to a control method of a flywheel tube of a high-power induction melting furnace, and belongs to the technical field of melting furnace equipment control.
Background
Along with the development of economy, the demand of the high-power efficient energy-saving induction melting furnace is gradually increased, and the energy-saving requirement is also higher and higher, wherein the method for increasing the voltage of the melting furnace body of the induction furnace and reducing copper loss is an effective method. At present, most manufacturers adopt a mode of improving the incoming line voltage or adopting a rectifier bridge to be connected in series to improve the voltage.
If the rectifier bridge is connected in series to increase the voltage, only one freewheel tube is needed to be added from the aspect of being convenient for the smooth starting of the induction furnace. However, to consider that the KK type fast thyristor is protected when a fault occurs, two freewheel tubes are added. Thus, contradiction is generated, and two freewheel tubes are connected at the same time, so that the problem of difficult starting is generated, and therefore, the prior art has no good solution.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control method for a flywheel tube of a high-power induction melting furnace.
In order to achieve the above purpose, the invention adopts the technical means that: a control method of a flywheel tube of a high-power induction melting furnace comprises the steps that in a flywheel tube control circuit, a flywheel tube is connected in a high-end rectifier bridge circuit, a KK type fast thyristor is connected in a low-end rectifier bridge circuit, when the high-end rectifier bridge circuit is started, the flywheel tube is always connected in, the KK type fast thyristor in the low-end rectifier bridge circuit is controlled by a trigger circuit, when the medium-frequency voltage rises to a set value, trigger pulse is generated through the trigger circuit to trigger, and the KK type fast thyristor is conducted to intervene in a main circuit to play a role in protecting the rectifier tube.
Furthermore, the freewheeling tube control circuit comprises a rectifying unit, a comparator unit, an oscillator unit, a pulse shaping unit, a pulse amplifying unit and a triggering unit, wherein the rectifying unit is used for voltage sampling, the output is connected with the comparator unit, the comparator unit is a dual-voltage comparator, the comparator unit is output to the oscillator unit and the pulse shaping unit, the pulse shaping unit is used for shaping and outputting the pulse to the pulse amplifying unit, the pulse amplifying unit is used for amplifying and outputting the pulse to the triggering unit, and the triggering unit triggers the KK type fast thyristor.
Furthermore, the rectifying unit comprises a voltage sampling transformer, voltage stabilizing resistors R1 and R2 connected with the voltage sampling transformer, a current limiting resistor R3, a voltage stabilizing tube DW1, a capacitor C1 and a polarity capacitor E1 for filtering, and outputting through a resistor R4.
Furthermore, the U1A same-direction input pin of the comparator unit is connected with the resistor R4, the U1A reverse input pin is connected with the adjustable resistor W1, one end of the adjustable resistor W1 is connected with a positive power supply, the other end of the adjustable resistor W1 is grounded through the resistor R6, the U1A same-direction input pin is connected with the U1A output pin through the resistor R5, the U1A output pin is connected with the resistor R7, one end of the resistor R8 and the cathode of the polar capacitor E2, the other end of the resistor R8 is connected with the resistor R9 and the cathode of the polar capacitor E3, the cathode of the polar capacitor E3 is grounded, the other end of the resistor R9 is connected with the U1B same-direction input pin, the U1B reverse input pin is connected with the adjustable resistor W2, one end of the adjustable resistor W2 is connected with the positive power supply, the other end of the adjustable resistor W2 is grounded through the resistor R11, the U1B same-direction input pin is connected with the U1B output pin through the resistor R10, the U1B output pin is connected with one end of the resistor R12, the cathode of the polar capacitor E4 and the cathode of the polar capacitor E12 are connected with the cathode of the polar capacitor E4, the cathode of the polar capacitor E4 and the positive capacitor E4 are connected with the positive output unit, the positive voltage of the positive voltage unit is connected to trigger a trigger unit, when a trigger voltage is required to be connected to a trigger voltage unit, and a main-type is connected to a trigger voltage, so that a trigger voltage is rapidly has a trigger circuit, and can be connected to a trigger to a main-state, and a trigger voltage.
Further, U1A and U1B of the comparator unit employ LM393 integrated circuits.
Furthermore, the oscillator unit includes a reset pin of U2B connected to the output pin of U1B, a control voltage pin of U2B is grounded through a capacitor C4, a trigger pin of U2B and a threshold pin are co-point, a discharge pin of U2B is grounded through a capacitor C2 and a capacitor C3 connected in parallel, the other end of the resistor R13 is connected to a positive power supply, the other end of the resistor R14 is connected to the threshold pin of U2B, an oscillator is formed by U2B, a capacitor C2, a capacitor C3, a resistor R13 and a resistor R14, the pulse rate of the oscillator is 2KHz, and oscillation pulses are output by the output pin of U2B.
Furthermore, the pulse shaping unit comprises a reset pin of U2A connected with an output pin of U1B, a trigger pin of U2A connected with the output pin of U2B through a capacitor C5 and connected with a positive power supply through a parallel resistor R15 and a diode D1, a control voltage pin of U2A connected with the ground through a capacitor C6, a discharge pin of U2A connected with a threshold pin at the same point and connected with the positive power supply through a capacitor C7 and a resistor R16, and a U2A output pin outputting shaping pulse.
Further, U2A and U2B of the oscillator unit and pulse shaping unit employ NE556.
Further, the pulse amplifying unit includes a field effect transistor Q1, a G pin of the field effect transistor Q1 is connected to an output pin of U2A through a resistor R17, an S pin of the field effect transistor Q1 is grounded, a D pin of the field effect transistor Q1 is connected to one end of a resistor R18, one end of a capacitor C8, and an anode end of a diode D3, a common point of a cathode end of the diode D3 and a power supply is connected to a common point of the other ends of the resistor R8 and the capacitor C8, a primary side of the pulse transformer is connected to a K pin of the KK type fast thyristor, a secondary side of the pulse transformer is connected to an anode of the diode D4, a cathode of the diode D4 is connected to a cathode of a zener diode DW2 and a resistor R19, the other end of the resistor R19 is connected to a G pin of the KK type fast thyristor, the anode of the zener diode DW2 is connected to a cathode of the KK type fast thyristor.
Still further, still be connected with electric capacity C9 between KK's the G foot and the K foot of quick thyristor, the positive pole of diode D5 is connected the K foot, and G foot is connected to the negative pole, and resistance R20 and emitting diode LED2 establish ties, and K foot is connected to the negative pole of emitting diode LED2, and G foot is connected to resistance R20's one end.
The invention has the beneficial effects that: stable starting, low control cost and long service life.
Drawings
The invention is further illustrated in the following figures and examples.
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
Example 1
As shown in figure 1, in a control circuit of a freewheeling tube of a high-power induction melting furnace, the freewheeling tube is connected in a high-end rectifier bridge loop, a KK type fast thyristor is connected in a low-end rectifier bridge loop, when the high-end rectifier bridge loop is started, the freewheeling tube is always connected in, the KK type fast thyristor in the low-end rectifier bridge loop is controlled by a trigger circuit, when the medium-frequency voltage rises to a set value, trigger pulse is generated by the trigger circuit to trigger, and the KK type fast thyristor is conducted to intervene in a main circuit to play a role in protecting the rectifying tube.
The follow current tube control circuit comprises a rectifying unit, a comparator unit, an oscillator unit, a pulse shaping unit, a pulse amplifying unit and a triggering unit, wherein the rectifying unit is used for voltage sampling, the output of the rectifying unit is connected with the comparator unit, the comparator unit is a dual-voltage comparator, the comparator unit is output to the oscillator unit and the pulse shaping unit, the pulse shaping unit is used for shaping and then outputting the pulse shaping unit to the pulse amplifying unit, the pulse amplifying unit is used for amplifying and then outputting the pulse shaping unit to the triggering unit, and the triggering unit triggers the KK type fast thyristor.
Example 2
As shown in fig. 2, as a specific design, the rectifying unit includes a voltage sampling transformer, voltage stabilizing resistors R1, R2 connected to the voltage sampling transformer, the current-limiting resistor R3, the voltage stabilizing tube DW1, the capacitor C1 and the polar capacitor E1 are filtered and output through the resistor R4.
U1A and U1B of the comparator unit employ LM393 integrated circuits. The U1A homodromous input pin is connected with a resistor R4, the U1A reverse input pin is connected with an adjustable resistor W1, one end of the adjustable resistor W1 is connected with a positive power supply, the other end of the adjustable resistor W1 is grounded through a resistor R6, the U1A homodromous input pin is connected with a U1A output pin through a resistor R5, the U1A output pin is connected with a resistor R7 and one end of a resistor R8, the negative electrode of a polar capacitor E2, the other end of the resistor R7 and the positive electrode of the polar capacitor E2 are connected with the positive power supply, the other end of the resistor R8 is connected with the positive electrode of the resistor R9 and the polar capacitor E3, the negative electrode of the polar capacitor E3 is grounded, the other end of the resistor R9 is connected with the U1B homodromous input pin, the U1B reverse input pin is connected with the adjustable resistor W2, one end of the adjustable resistor W2 is connected with a forward power supply, the other end of the adjustable resistor W2 is grounded through a resistor R11, a U1B homodromous input pin is connected with a U1B output pin through a resistor R10, the U1B output pin is connected with one end of a resistor R12 and the negative electrode of a polar capacitor E4, the other end of the resistor R12 and the positive electrode of the polar capacitor E4 are connected with the forward power supply, the U1B output pin controls the reset ends of the oscillator unit and the pulse shaping unit, a trigger pulse is sent only when the voltage of the furnace body reaches a certain value according to the requirement, and the KK type fast thyristor is triggered to be opened and connected with a main circuit, so that a continuous tube is protected during faults.
U2A and U2B of the oscillator unit and pulse shaping unit employ NE556. The oscillator unit comprises a U2B reset pin connected with a U1B output pin, a U2B control voltage pin is grounded through a capacitor C4, a U2B trigger pin and a threshold pin are in common points, a U2B discharge pin is grounded through a capacitor C2 and a capacitor C3 which are connected in parallel, the other end of the resistor R13 is connected with a positive power supply, the other end of the resistor R14 is connected with the U2B threshold pin, an oscillator is formed by the U2B, the capacitor C2, the capacitor C3, the resistor R13 and the resistor R14, the oscillator pulse rate is 2KHz, and oscillation pulses are output by the U2B output pin.
The pulse shaping unit comprises a U2A reset pin, a U1B output pin, a U2A trigger pin, a resistor R15, a diode D1, a capacitor C6, a U2A control voltage pin, a capacitor C7, a resistor R16 and a shaping pulse, wherein the U2A reset pin is connected with the U1B output pin, the U2A trigger pin is connected with the U2B output pin through the capacitor C5 and connected with a positive power supply through the resistor R15 and the diode D1 which are connected in parallel, the U2A control voltage pin is grounded through the capacitor C6, the U2A discharge pin and the threshold pin are in common point, the U2A output pin is grounded through the capacitor C7 and connected with the positive power supply through the resistor R16.
The pulse amplifying unit comprises a field effect tube Q1, a G pin of the field effect tube Q1 is connected with a U2A output pin through a resistor R17, an S pin of the field effect tube Q1 is grounded, a D pin of the field effect tube Q1 is connected with one end of a resistor R18, one end of a capacitor C8 and the positive end of a diode D3, the common point of the negative end of the diode D3 and a power supply is respectively connected with the primary of a pulse transformer, one end of a secondary of the pulse transformer is connected with a K pin of a KK type fast thyristor, the other end of the secondary of the pulse transformer is connected with the positive electrode of a diode D4, the negative electrode of the diode D4 is connected with the negative electrode of a voltage stabilizing diode DW2 and a resistor R19, the other end of the resistor R19 is connected with the G pin of the KK type fast thyristor, the positive electrode of the voltage stabilizing diode DW2 is in common point with the K pin, and the A pin of the KK type fast thyristor is connected with the negative electrode of the output pin.
And a capacitor C9 is further connected between the G pin and the K pin of the KK type rapid thyristor, the positive electrode of the diode D5 is connected with the K pin, the negative electrode of the diode D5 is connected with the G pin, the resistor R20 is connected with the LED2 in series, the negative electrode of the LED2 is connected with the K pin, and one end of the resistor R20 is connected with the G pin.
When the voltage is sampled, a group of 20V voltages on a voltage sampling transformer matched with an original machine are utilized, the voltages are rectified through a rectifier bridge S1WB, R1 and R2 enable the voltages to be stable, R3 is used for limiting current, DW1 is used for stabilizing voltage, E1 and C1 are used for filtering, a comparator U1A (3) (LM 393) is added through R4, a comparator U1B (5) (LM 393) is added through R8 and R9, reset ends of a control oscillator and a pulse shaping circuit are output, namely, a furnace body voltage is set to reach a certain value according to requirements, trigger pulses are sent, KK is triggered and connected into a main circuit, and the effect of protecting KP (key point) tubes in fault is achieved.
The oscillator circuit is composed of U2B (NE 556) R13, R14, C2, C3. The pulse rate of the oscillator is 2KHZ, the oscillation pulse U2B (9) is output and is input to the pin of the shaping circuit U2A (6) through C5, the output of U2A (5) is added to the grid electrode of the pulse amplifying circuit Q1 (IRF 540) through R17, after the pulse is amplified, the pulse is passed through the primary and secondary stages of the pulse transformer and then passes through the transient diode front position, R19 is limited, and the output pulse triggers the KK tube.
While the invention has been described and illustrated in detail in the foregoing description with reference to specific embodiments thereof, it should be noted that various equivalent changes and modifications could be made to the above described embodiments without departing from the spirit of the invention as defined by the appended claims.
Claims (9)
1. A control method of a flywheel tube of a high-power induction melting furnace is characterized by comprising the following steps of: the high-end rectifier bridge circuit is connected with a freewheeling tube, the low-end rectifier bridge circuit is connected with a KK type fast thyristor, the freewheeling tube in the high-end rectifier bridge circuit is always connected when the power-on is started, the KK type fast thyristor in the low-end rectifier bridge circuit is controlled by a trigger unit, when the intermediate frequency voltage rises to a set value, trigger pulse is generated by the trigger unit to trigger, and the KK type fast thyristor is conducted to intervene in the main circuit to play a role in protecting the follow-up tube;
the continuous tube control circuit comprises a rectifying unit, a comparator unit, an oscillator unit, a pulse shaping unit, a pulse amplifying unit and a triggering unit, wherein the rectifying unit is used for voltage sampling, the output of the rectifying unit is connected with the comparator unit, the comparator unit is a dual-voltage comparator, the comparator unit is output to the oscillator unit and the pulse shaping unit, the pulse shaping unit is used for shaping and outputting the pulse to the pulse amplifying unit, the pulse amplifying unit is used for amplifying and outputting the pulse to the triggering unit, and the triggering unit is used for triggering the KK type fast thyristor.
2. The method for controlling the freewheel tube of the high-power induction melting furnace according to claim 1 is characterized in that: the rectification unit comprises a voltage sampling transformer, voltage stabilizing resistors R1 and R2 connected with the voltage sampling transformer, a current limiting resistor R3, a voltage stabilizing tube DW1, a capacitor C1 and a polarity capacitor E1 for filtering, and outputting through a resistor R4.
3. The control method of the flywheel tube of the high-power induction melting furnace according to claim 2, wherein the method comprises the following steps: the U1A syntropy input foot of comparator unit connects resistance R4, U1A reverse input foot connects adjustable resistance W1, adjustable resistance W1 one end is connected positive power, the other end passes through resistance R6 ground connection, U1A syntropy input foot passes through resistance R5 and connects U1A output foot, U1A output foot connects resistance R7, the one end of resistance R8, and polarity electric capacity E2's negative pole, the other end of resistance R7 and polarity electric capacity E2's positive pole connect positive power, resistance R9 and polarity electric capacity E3's positive pole are connected to the other end of resistance R8, polarity electric capacity E3's negative pole ground connection, adjustable resistance W2 is connected to the other end U1B syntropy input foot to the other end of resistance R9, adjustable resistance W2 one end is connected positive power, the other end is connected through resistance R11 ground connection, U1B syntropy input foot passes through resistance R10 and connects the one end of resistance R12, and polarity electric capacity E4's negative pole, the other end of resistance R12 and polarity electric capacity E4's positive electrode and polarity electric capacity E1B connect the positive control unit of polarity electric capacity E4, trigger the trigger circuit is connected to the trigger voltage when setting up the main phase current, trigger circuit reaches the trigger voltage.
4. A method of controlling a flywheel tube of a high power induction melting furnace as claimed in claim 3, wherein: the comparator units U1A and U1B employ LM393 integrated circuits.
5. A method of controlling a flywheel tube of a high power induction melting furnace as claimed in claim 3, wherein: the oscillator unit comprises a U1B output pin connected with a reset pin of U2B, a control voltage pin of U2B is grounded through a capacitor C4, a trigger pin and a threshold pin of U2B are in common points, a discharge pin of U2B is grounded through a capacitor C2 and a capacitor C3 which are connected in parallel, the other end of the resistor R13 is connected with a positive power supply, the other end of the resistor R14 is connected with the threshold pin of U2B, an oscillator is formed by the U2B, the capacitor C2, the capacitor C3, the resistor R13 and the resistor R14, the pulse rate of the oscillator is 2KHz, and oscillation pulses are output by the U2B output pin.
6. The control method of the flywheel tube of the high-power induction melting furnace according to claim 5, wherein the method comprises the following steps: the pulse shaping unit comprises a U2A reset pin, a U1B output pin, a U2A trigger pin, a resistor R15, a diode D1, a positive power supply, a U2A control voltage pin, a capacitor C6, a U2A discharge pin, a threshold pin, a resistor R16, and a shaping pulse.
7. The method for controlling the freewheel tube of the high-power induction melting furnace according to claim 6 is characterized in that: U2A and U2B of the oscillator unit and pulse shaping unit employ NE556.
8. The method for controlling the freewheel tube of the high-power induction melting furnace according to claim 6 is characterized in that: the pulse amplifying unit comprises a field effect tube Q1, a G pin of the field effect tube Q1 is connected with a U2A output pin through a resistor R17, an S pin of the field effect tube Q1 is grounded, a D pin of the field effect tube Q1 is connected with one end of a resistor R18, one end of a capacitor C8 and the positive end of a diode D3, the common point of the negative end of the diode D3 and a power supply is respectively connected with the primary of a pulse transformer, one end of the secondary of the pulse transformer is connected with a K pin of a KK type fast thyristor, the other end of the secondary of the pulse transformer is connected with the positive electrode of a diode D4, the negative electrode of the diode D4 is connected with the negative electrode of a voltage stabilizing diode DW2 and a resistor R19, the other end of the resistor R19 is connected with the G pin of the KK type fast thyristor, the positive electrode of the voltage stabilizing diode DW2 is in common point with the K pin, and the A pin of the KK type fast thyristor is connected with the negative electrode of the output pin.
9. The method for controlling the freewheel tube of the high-power induction melting furnace according to claim 8 is characterized in that: and a capacitor C9 is further connected between the G pin and the K pin of the KK type rapid thyristor, the positive electrode of the diode D5 is connected with the K pin, the negative electrode of the diode D5 is connected with the G pin, the resistor R20 is connected with the LED2 in series, the negative electrode of the LED2 is connected with the K pin, and one end of the resistor R20 is connected with the G pin.
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| CN202011479578.1A CN112583286B (en) | 2020-12-15 | 2020-12-15 | Control method for flywheel tube of high-power induction melting furnace |
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| CN202011479578.1A CN112583286B (en) | 2020-12-15 | 2020-12-15 | Control method for flywheel tube of high-power induction melting furnace |
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| CN112583286B true CN112583286B (en) | 2024-02-09 |
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| CN112583286A (en) | 2021-03-30 |
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