CN214039496U - Controllable variable current arc furnace - Google Patents
Controllable variable current arc furnace Download PDFInfo
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- CN214039496U CN214039496U CN202022919448.7U CN202022919448U CN214039496U CN 214039496 U CN214039496 U CN 214039496U CN 202022919448 U CN202022919448 U CN 202022919448U CN 214039496 U CN214039496 U CN 214039496U
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Abstract
The utility model provides a controllable electric arc furnace that flows, this controllable electric arc furnace that flows are applied to electric arc furnace control technical field, include: the device comprises a phase-shifting transformer, a three-phase converter and an alternating current electric arc furnace; the primary side of the phase-shifting transformer is used for connecting a three-phase power supply, the secondary side of the phase-shifting transformer is connected with the input end of the three-phase converter, and the output end of the three-phase converter is connected with the power supply input end of the alternating current electric arc furnace; and the controlled end of the three-phase converter is used for receiving an external driving pulse signal. The utility model provides a controllable variable current electric arc furnace structure can reduce the loss, and then reduces the running cost.
Description
Technical Field
The utility model belongs to the technical field of electric arc furnace control, more specifically say, relate to a controllable variable current electric arc furnace.
Background
In the prior art, the control of the furnace temperature of the electric arc furnace is usually realized by controlling the lifting of the electrode, the automatic control effect of the control scheme is not ideal, the manual control depends on experience and technical level, the risk of causing the hard and soft accidents of the electrode exists, and the problems of unstable furnace conditions, high energy consumption and the like exist, so that the operation cost of the electric arc furnace is increased. On this basis, in order to prevent the heating rod of the electric arc furnace from being burnt out by large current, special equipment such as a super-capacity circuit breaker and a regulating transformer needs to be arranged in the prior art, and the operation cost of the electric arc furnace is further increased.
Therefore, how to reduce the operation cost of the electric arc furnace becomes a technical problem which needs to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a controllable variable current electric arc furnace to solve the higher technical problem of the running cost of the electric arc furnace that exists among the prior art.
In order to achieve the above object, the utility model provides a technical scheme provides a controllable variable current electric arc furnace, controllable variable current electric arc furnace includes:
the device comprises a phase-shifting transformer, a three-phase converter and an alternating current electric arc furnace;
the primary side of the phase-shifting transformer is used for connecting a three-phase power supply, the secondary side of the phase-shifting transformer is connected with the input end of the three-phase converter, and the output end of the three-phase converter is connected with the power supply input end of the alternating current electric arc furnace;
and the controlled end of the three-phase converter is used for receiving an external driving pulse signal.
Optionally, the secondary side of the phase-shifting transformer includes N secondary coils isolated from each other, and each secondary coil includes three groups of three-phase coils;
the three-phase converter comprises 3N rectifying and inverting units;
each group of three-phase coils is connected with each rectification inversion unit in a one-to-one correspondence manner;
the output ends of the 3N rectification inversion units are connected in parallel to form the output end of the three-phase converter;
wherein N is an integer greater than zero.
Optionally, the three sets of three-phase coils include a first set of three-phase coils, a second set of three-phase coils, and a third set of three-phase coils;
the rectification inversion unit comprises a first inversion output end and a second inversion output end;
the first inversion output ends corresponding to each first group of three-phase coils are connected together to form a first phase output end of the three-phase converter, the first inversion output ends corresponding to each second group of three-phase coils are connected together to form a second phase output end of the three-phase converter, and the first inversion output ends corresponding to each third group of three-phase coils are connected together to form a third phase output end of the three-phase converter;
and the second inversion output end corresponding to each first group of three-phase coils, the second inversion output end corresponding to each second group of three-phase coils and the second inversion output end corresponding to each third group of three-phase coils are connected in common.
Optionally, the rectification and inversion unit includes a three-phase uncontrolled rectification circuit and an H-bridge fully controlled inversion circuit;
the input end of the three-phase uncontrolled rectifying circuit is correspondingly connected with the three-phase coil of the phase-shifting transformer, and the output end of the three-phase uncontrolled rectifying circuit is connected with the input end of the H-bridge full-controlled inverter circuit;
the output ends of the 3N H-bridge full-control inverter circuits are connected in parallel to form the output end of the three-phase converter;
and the controlled ends of the 3N H-bridge full-control inverter circuits form the controlled end of the three-phase converter.
Optionally, the three-phase uncontrolled rectifying circuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode;
the negative end of the first diode, the negative end of the third diode and the negative end of the fifth diode are connected in common, and the positive end of the second diode, the positive end of the fourth diode and the positive end of the sixth diode are connected in common;
the connection end formed by connecting the cathode end of the second diode with the anode end of the first diode is a first input end of the three-phase uncontrolled rectifying circuit; the connection end formed by connecting the negative end of the fourth diode with the positive end of the third diode is a second input end of the three-phase uncontrolled rectifying circuit; the connection end formed by connecting the negative end of the sixth diode with the positive end of the fifth diode is the third input end of the three-phase uncontrolled rectifying circuit;
the first input end, the second input end and the third input end of the three-phase uncontrolled rectifying circuit are correspondingly connected with the three-phase coil of the phase-shifting transformer;
and the negative end of the first diode and the positive end of the second diode form the output end of the three-phase uncontrolled rectifying circuit.
Optionally, the three-phase uncontrolled rectifying circuit further includes a filter capacitor;
and the first end of the filter capacitor is connected with the negative electrode end of the first diode, and the second end of the filter capacitor is connected with the positive electrode end of the second diode.
Optionally, the H-bridge full-control inverter circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor;
a source of the first transistor is connected to a source of the third transistor, and a drain of the second transistor is connected to a drain of the fourth transistor;
the drain electrode of the first transistor is connected with the source electrode of the second transistor, and the drain electrode of the third transistor is connected with the source electrode of the fourth transistor;
the source electrode of the first transistor and the drain electrode of the second transistor form an input end of the H-bridge full-control inverter circuit, the drain electrode of the first transistor and the drain electrode of the third transistor form an output end of the H-bridge full-control inverter circuit, and the gate electrode of the first transistor, the gate electrode of the second transistor, the gate electrode of the third transistor and the gate electrode of the fourth transistor form a controlled end of the H-bridge full-control inverter circuit.
Optionally, the H-bridge full-control inverter circuit further includes a reactor;
and a first end of the reactor is connected with a drain electrode of the first transistor, and a second end of the reactor and a drain electrode of the third transistor form an output end of the H-bridge full-control inverter circuit.
Optionally, the controllably variable flow electric arc furnace further comprises:
a plurality of no-load isolation switches;
the no-load isolation switch is connected between the output end of the three-phase converter and the power supply input end of the alternating current arc furnace.
Optionally, the controllably variable flow electric arc furnace further comprises:
a processor;
and the processor is connected with the controlled end of the three-phase converter.
The utility model provides a controllable variable current electric arc furnace's beneficial effect lies in:
the inventor of the application considers that the direct connection of the arc furnace as a nonlinear and irregular load to the power grid through the transformer not only causes the increase of line loss, but also requires the support of larger power grid capacity and also generates a large amount of flicker and harmonic waves, thereby providing an implementation scheme of the controllable variable-current arc furnace. The utility model discloses to the irregular load characteristic of electric arc furnace nonlinearity, increased on prior art's basis and moved the phase-shifting transformer and restrain electric arc furnace flicker and higher harmonic, increased the running power factor that three-phase current transformer improves the electric arc furnace, convert reactive power into effective power, not only can improve electric energy efficiency, save the electric energy, also can eliminate impact and the pollution to the electric wire netting, play the guard action to sensitive power equipment. That is to say, the utility model provides a controllable variable current electric arc furnace structure can reduce the loss, and then reduces the running cost. On this basis, because the rectification contravariant function of three-phase current transformer can support the regulation of electric current, the utility model discloses need not to set up special equipment such as super large capacity circuit breaker and regulating transformer, consequently further reduced the running cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a controllably variable flow electric arc furnace according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rectification and inversion unit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a controllably variable flow electric arc furnace according to an embodiment of the present invention, the controllably variable flow electric arc furnace including:
a phase-shifting transformer 10, a three-phase current transformer 20 and an alternating current electric arc furnace 30.
The primary side of the phase-shifting transformer 10 is used for connecting a three-phase power supply, the secondary side of the phase-shifting transformer 10 is connected with the input end of the three-phase converter 20, and the output end of the three-phase converter 20 is connected with the power supply input end of the alternating current electric arc furnace 30 and used for supplying power to the alternating current electric arc furnace 30.
The controlled end of the three-phase current transformer 20 is used for receiving an external driving pulse signal.
In this embodiment, the three-phase power supply may be directly output from the power grid, or may be output from the secondary power grid after voltage regulation. The parameters of the phase-shifting transformer 20 can be determined based on the characteristics of the three-phase power supply, so as to ensure that the phase-shifting transformer 20 can adapt to both the direct access mode of the high-voltage side power grid and the access mode of the secondary side power grid after voltage reduction.
In this embodiment, the three-phase current transformer 20 can be controlled by the driving pulse signal, so as to control the current of the ac arc furnace 30.
In the present embodiment, the three-phase converter 20 can also provide a fault protection function, and when the current input to the ac arc furnace 30 is large, the current input to the ac arc furnace 30 can be adjusted by controlling the three-phase converter 20.
Optionally, referring to fig. 1, as a specific implementation manner of the controlled variable-current arc furnace provided by the embodiment of the present invention, the secondary side of the phase-shifting transformer 20 may include N secondary coils isolated from each other, and each secondary coil includes three groups of three-phase coils, that is, the phase-shifting transformer 30 includes 3N groups of three-phase coils. Wherein, the direct phase shift angle of each group of three-phase coils is pi/3N, N is an integer larger than zero, which can be determined based on the transformation ratio of the phase-shift transformer 20 and the capacity of the alternating current electric arc furnace 30.
In this embodiment, three-phase inverterThe device can comprise 3N rectifying and inverting units (corresponding to U in FIG. 1)1、W1、V1、U2、W2、V2，…，UN-1、WN-1、VN-1、UN、WN、VN) Each group of three-phase coils is connected with each rectification inversion unit in a one-to-one correspondence mode, and the output ends of the 3N rectification inversion units are connected in parallel to form the output end of the three-phase converter.
From the above description, the inventor of the present application has given a realization scheme of a controlled variable current arc furnace in consideration of the fact that direct connection of the arc furnace as a nonlinear and irregular load to the grid through a transformer not only causes increased line loss, but also requires greater grid capacity support, and also generates a large amount of flicker and harmonics. The utility model discloses to the irregular load characteristic of electric arc furnace nonlinearity, increased on prior art's basis and moved the phase-shifting transformer and restrain electric arc furnace flicker and higher harmonic, increased the running power factor that three-phase current transformer improves the electric arc furnace, convert reactive power into effective power, not only can improve electric energy efficiency, save the electric energy, also can eliminate impact and the pollution to the electric wire netting, play the guard action to sensitive power equipment. That is to say, the utility model provides a controllable variable current electric arc furnace structure can reduce the loss, and then reduces the running cost. On this basis, because the rectification contravariant function of three-phase current transformer can support the regulation of electric current, the utility model discloses need not to set up special equipment such as super large capacity circuit breaker and regulating transformer, consequently further reduced the running cost.
Optionally, as a specific implementation manner of the controlled variable-current arc furnace provided by the embodiment of the present invention, the three groups of three-phase coils include a first group of three-phase coils, a second group of three-phase coils, and a third group of three-phase coils.
The rectification inversion unit comprises a first inversion output end and a second inversion output end.
In this embodiment, a group of three-phase coils is correspondingly connected to a rectification and inversion unit, and therefore, each group of three-phase coils corresponds to a first inversion output end and a second inversion output end.
In this embodiment, the three-phase current transformer outputs three-phase current, the output ends of the 3N rectification and inversion units are connected in parallel to form the output end of the three-phase current transformer, and the parallel connection mode of the output ends of the rectification and inversion units can be as follows:
the first inversion output ends corresponding to the first group of three-phase coils are connected together to form a first phase output end of the three-phase converter, the first inversion output ends corresponding to the second group of three-phase coils are connected together to form a second phase output end of the three-phase converter, and the first inversion output ends corresponding to the third group of three-phase coils are connected together to form a third phase output end of the three-phase converter.
And the second inversion output end corresponding to each first group of three-phase coils, the second inversion output end corresponding to each second group of three-phase coils and the second inversion output end corresponding to each third group of three-phase coils are connected in common.
Optionally, as the utility model provides a specific implementation of controllable variable current electric arc furnace, rectification contravariant unit includes that three-phase is not controlled rectifier circuit and H bridge full control inverter circuit.
The input end of the three-phase uncontrolled rectifying circuit is correspondingly connected with the three-phase coil of the phase-shifting transformer, and the output end of the three-phase uncontrolled rectifying circuit is connected with the input end of the H-bridge full-controlled inverter circuit.
The output ends of the 3N H-bridge full-control inverter circuits are connected in parallel to form the output end of the three-phase converter.
And the controlled ends of the 3N H-bridge full-control inverter circuits form the controlled end of the three-phase converter.
In this embodiment, the H-bridge full-control inverter circuit can effectively control the heating body current (i.e., the current input into the ac arc furnace), thereby improving the heating efficiency, preventing the overcurrent, and prolonging the service life of the heating body. And the output power can be controlled based on the H-bridge full-control inverter circuit, and the balanced control of unbalanced load operation current of an alternating current electric arc furnace and the like can be realized.
In this embodiment, the heating body current can be determined by the temperature control requirement, and the output current frequency of the H-bridge full-control inverter circuit can be flexibly selected according to the requirement, so that the constant frequency temperature regulation of the ac arc furnace can be realized, and the variable frequency temperature regulation of the ac arc furnace can also be realized.
Optionally, please refer to fig. 2, fig. 2 is a schematic structural diagram of a rectification inverter unit according to an embodiment of the present invention, and the diodes in fig. 2 are, from top to bottom, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode from left to right, respectively.
As a specific implementation mode of the controllable variable flow electric arc furnace provided by the embodiment of the utility model, the three-phase uncontrolled rectifying circuit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode.
The negative end of the first diode, the negative end of the third diode and the negative end of the fifth diode are connected in common, and the positive end of the second diode, the positive end of the fourth diode and the positive end of the sixth diode are connected in common.
The connection end formed by connecting the cathode end of the second diode with the anode end of the first diode is the first input end of the three-phase uncontrolled rectifying circuit. And the connection end formed by connecting the cathode end of the fourth diode with the anode end of the third diode is a second input end of the three-phase uncontrolled rectifying circuit. And the connection end formed by connecting the cathode end of the sixth diode with the anode end of the fifth diode is the third input end of the three-phase uncontrolled rectifying circuit.
The first input end, the second input end and the third input end of the three-phase uncontrolled rectifying circuit are correspondingly connected with the three-phase coil of the phase-shifting transformer.
And the negative end of the first diode and the positive end of the second diode form the output end of the three-phase uncontrolled rectifying circuit.
In this embodiment, a fast fuse protection circuit may be further connected to the first input terminal, the second input terminal, and the third input terminal of the three-phase uncontrolled rectifying circuit to implement a circuit protection function.
Optionally, as the utility model provides a controllable variable current electric arc furnace's a concrete implementation mode, the uncontrolled rectifier circuit of three-phase still includes filter capacitor.
The first end of the filter capacitor is connected with the cathode end of the first diode, and the second end of the filter capacitor is connected with the anode end of the second diode.
In this embodiment, referring to fig. 2, a filter capacitor may be further added to the three-phase uncontrolled rectifying circuit to implement a filtering function.
Optionally, please refer to fig. 2, where fig. 2 is a schematic structural diagram of a rectification and inversion unit according to an embodiment of the present invention, and the transistors in fig. 2 are, from top to bottom, a first transistor, a second transistor, a third transistor, and a fourth transistor from left to right, respectively.
As a specific implementation manner of the controllable variable current arc furnace provided by the embodiment of the present invention, the H-bridge full-control inverter circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor.
The source of the first transistor is connected to the source of the third transistor, and the drain of the second transistor is connected to the drain of the fourth transistor.
The drain of the first transistor is connected to the source of the second transistor, and the drain of the third transistor is connected to the source of the fourth transistor.
The source electrode of the first transistor and the drain electrode of the second transistor form an input end of the H-bridge full-control inverter circuit, the drain electrode of the first transistor and the drain electrode of the third transistor form an output end of the H-bridge full-control inverter circuit, and the grid electrode of the first transistor, the grid electrode of the second transistor, the grid electrode of the third transistor and the grid electrode of the fourth transistor form a controlled end of the H-bridge full-control inverter circuit.
Optionally, referring to fig. 2, as a specific implementation manner of the controlled variable current arc furnace provided in the embodiment of the present invention, the H-bridge full-control inverter circuit further includes a reactor.
The first end of the reactor is connected with the drain electrode of the first transistor, and the second end of the reactor and the drain electrode of the third transistor form the output end of the H-bridge full-control inverter circuit.
Optionally, referring to fig. 2, as a specific implementation manner of the controllably variable flow electric arc furnace provided in the embodiment of the present invention, the controllably variable flow electric arc furnace further includes:
a plurality of no-load isolation switches.
The no-load isolation switch is connected between the output end of the three-phase converter and the power supply input end of the AC electric arc furnace.
In this embodiment, a plurality of no-load isolating switches can be added to the controlled variable current electric arc furnace. In a specific implementation, each output end of the three-phase converter may be provided with one no-load isolating switch, or each output end of the rectifying and inverting unit in the three-phase converter may be provided with one no-load isolating switch, which is not limited herein.
In this embodiment, the fault protection of a controlled converter arc furnace can be better achieved by a combination of a three-phase converter and an unloaded disconnector.
Optionally, as a specific implementation manner of the controllable variable current electric arc furnace provided by the embodiment of the present invention, the controllable variable current electric arc furnace further includes:
a processor.
The processor is connected with the controlled end of the three-phase converter.
In this embodiment, the processor may be a DSP processor (i.e. a digital signal processor) which is essentially a transistor driving circuit for outputting a driving pulse signal to control the output current of the three-phase current transformer.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A controllably variable flow electric arc furnace comprising:
the device comprises a phase-shifting transformer, a three-phase converter and an alternating current electric arc furnace;
the primary side of the phase-shifting transformer is used for connecting a three-phase power supply, the secondary side of the phase-shifting transformer is connected with the input end of the three-phase converter, and the output end of the three-phase converter is connected with the power supply input end of the alternating current electric arc furnace;
and the controlled end of the three-phase converter is used for receiving an external driving pulse signal.
2. The controllably variable flow electric arc furnace of claim 1 wherein the secondary side of said phase shifting transformer includes N mutually isolated secondary coils, each secondary coil including three sets of three phase coils;
the three-phase converter comprises 3N rectifying and inverting units;
each group of three-phase coils is connected with each rectification inversion unit in a one-to-one correspondence manner;
the output ends of the 3N rectification inversion units are connected in parallel to form the output end of the three-phase converter;
wherein N is an integer greater than zero.
3. The controllably variable flow electric arc furnace of claim 2 wherein said three sets of three-phase coils comprise a first set of three-phase coils, a second set of three-phase coils, a third set of three-phase coils;
the rectification inversion unit comprises a first inversion output end and a second inversion output end;
the first inversion output ends corresponding to each first group of three-phase coils are connected together to form a first phase output end of the three-phase converter, the first inversion output ends corresponding to each second group of three-phase coils are connected together to form a second phase output end of the three-phase converter, and the first inversion output ends corresponding to each third group of three-phase coils are connected together to form a third phase output end of the three-phase converter;
and the second inversion output end corresponding to each first group of three-phase coils, the second inversion output end corresponding to each second group of three-phase coils and the second inversion output end corresponding to each third group of three-phase coils are connected in common.
4. The controllably variable flow electric arc furnace of claim 2 wherein said rectifying inverter unit comprises a three-phase uncontrolled rectifier circuit and an H-bridge fully controlled inverter circuit;
the input end of the three-phase uncontrolled rectifying circuit is correspondingly connected with the three-phase coil of the phase-shifting transformer, and the output end of the three-phase uncontrolled rectifying circuit is connected with the input end of the H-bridge full-controlled inverter circuit;
the output ends of the 3N H-bridge full-control inverter circuits are connected in parallel to form the output end of the three-phase converter;
and the controlled ends of the 3N H-bridge full-control inverter circuits form the controlled end of the three-phase converter.
5. The controllably variable flow electric arc furnace of claim 4 wherein said three-phase uncontrolled rectifying circuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode;
the negative end of the first diode, the negative end of the third diode and the negative end of the fifth diode are connected in common, and the positive end of the second diode, the positive end of the fourth diode and the positive end of the sixth diode are connected in common;
the connection end formed by connecting the cathode end of the second diode with the anode end of the first diode is a first input end of the three-phase uncontrolled rectifying circuit; the connection end formed by connecting the negative end of the fourth diode with the positive end of the third diode is a second input end of the three-phase uncontrolled rectifying circuit; the connection end formed by connecting the negative end of the sixth diode with the positive end of the fifth diode is the third input end of the three-phase uncontrolled rectifying circuit;
the first input end, the second input end and the third input end of the three-phase uncontrolled rectifying circuit are correspondingly connected with the three-phase coil of the phase-shifting transformer;
and the negative end of the first diode and the positive end of the second diode form the output end of the three-phase uncontrolled rectifying circuit.
6. The controllably variable flow electric arc furnace of claim 5 wherein said three-phase uncontrolled rectifying circuit further comprises a filter capacitor;
and the first end of the filter capacitor is connected with the negative electrode end of the first diode, and the second end of the filter capacitor is connected with the positive electrode end of the second diode.
7. The controllably variable flow electric arc furnace of claim 4 wherein said H-bridge fully controlled inverter circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor;
a source of the first transistor is connected to a source of the third transistor, and a drain of the second transistor is connected to a drain of the fourth transistor;
the drain electrode of the first transistor is connected with the source electrode of the second transistor, and the drain electrode of the third transistor is connected with the source electrode of the fourth transistor;
the source electrode of the first transistor and the drain electrode of the second transistor form an input end of the H-bridge full-control inverter circuit, the drain electrode of the first transistor and the drain electrode of the third transistor form an output end of the H-bridge full-control inverter circuit, and the gate electrode of the first transistor, the gate electrode of the second transistor, the gate electrode of the third transistor and the gate electrode of the fourth transistor form a controlled end of the H-bridge full-control inverter circuit.
8. The controllably variable flow electric arc furnace of claim 7 wherein said H-bridge fully controlled inverter circuit further includes a reactor;
and a first end of the reactor is connected with a drain electrode of the first transistor, and a second end of the reactor and a drain electrode of the third transistor form an output end of the H-bridge full-control inverter circuit.
9. The controllably variable flow electric arc furnace of claim 1 further comprising:
a plurality of no-load isolation switches;
the no-load isolation switch is connected between the output end of the three-phase converter and the power supply input end of the alternating current arc furnace.
10. The controllably variable flow electric arc furnace of claim 1 further comprising:
a processor;
and the processor is connected with the controlled end of the three-phase converter.
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| CN202022919448.7U CN214039496U (en) | 2020-12-08 | 2020-12-08 | Controllable variable current arc furnace |
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| CN202022919448.7U CN214039496U (en) | 2020-12-08 | 2020-12-08 | Controllable variable current arc furnace |
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