CN220050376U - Variable polarity circuit of direct current submerged arc welding power supply - Google Patents
Variable polarity circuit of direct current submerged arc welding power supply Download PDFInfo
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- CN220050376U CN220050376U CN202321375216.7U CN202321375216U CN220050376U CN 220050376 U CN220050376 U CN 220050376U CN 202321375216 U CN202321375216 U CN 202321375216U CN 220050376 U CN220050376 U CN 220050376U
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Abstract
The utility model relates to a variable polarity circuit of a direct-current submerged arc welding power supply, which comprises a transformer T1, a controllable rectifying circuit, a Hall current sensor TA1/TA2, a reactor L1 and a resistance-capacitance loop, wherein a primary coil of the transformer T1 is connected with a three-phase power supply, the controllable rectifying circuit comprises thyristors SCR 1-SCR 6, after the SCR 1-SCR 6 are connected in pairs in series, two ends of the SCR 1-SCR 6 are respectively connected with one end of the reactor L1 through the Hall current sensor TA1 and the Hall sensor TA2, three secondary coils of the transformer T1 are respectively connected between an anode and a cathode of the thyristors SCR in series, a common end of the secondary coil of the transformer T1 is connected with a weldment, the other end of the reactor L1 is connected with the resistance-capacitance loop, and the resistance-capacitance loop 2 is connected between an electrode and the weldment and is grounded. The output polarity is switched by utilizing the positive and negative three-phase half-wave rectification mode, an interface cable is not required to be switched by adopting a manual mode, the integration on an automatic production line is facilitated, and the welding operation efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of power supply circuits of welding machines, in particular to a variable polarity circuit of a direct current submerged arc welding power supply.
Background
Submerged arc welding is a welding method by burning an electric arc under a flux layer, has the advantages of higher automation degree, good weld joint forming, stable welding quality, high welding productivity, no arc light, little smoke dust and the like, and is a main welding method in the manufacture of important steel structures such as pressure vessels, pipeline manufacture, box-type beam columns and the like.
At present, most submerged arc welding used in various industries adopts a high-power direct current power supply, and in the production and use process, two connection modes exist, one is direct current positive connection, namely a weldment (weldment) is connected with a positive electrode of the power supply, an electrode is connected with a negative electrode, and the heat of the submerged arc welding is distributed to 70% of the weldment and 30% of the electrode. The connecting mode has the advantages of large heating value, large penetration, high efficiency and the like when the thick plates are welded. The other is direct current reverse connection, namely, a weldment (weldment) is connected with a negative electrode of a power supply, an electrode is connected with a positive electrode, heat is distributed into 30% of the weldment and 70% of the electrode, arc combustion is stable, the thermal deformation amount of the weldment is small, the effect of removing an oxide film by cathode cleaning is achieved, and direct current reverse connection is generally needed when metals such as thin plates, aluminum alloy, magnesium and the like are welded. The current direct-current submerged arc welding power supplies all adopt fixed polarity output, when a user needs to switch the polarity of a welding machine, the output interface cable is manually exchanged, the automatic production line production is not facilitated, the manual switching is low in efficiency, and certain potential safety hazards exist, so that the polarity-changing application of the direct-current submerged arc welding power supplies needs to be improved.
Disclosure of Invention
In view of the above, it is desirable to provide a variable polarity circuit for a dc submerged arc welding power supply.
The utility model provides a variable polarity circuit of direct current submerged arc welding power, includes transformer T1, controllable rectifier circuit, hall current sensor TA1/TA2, reactor L1, resistance-capacitance return circuit, transformer T1's primary coil is connected with three-phase electric power supply, controllable rectifier circuit includes thyristor SCR1 ~ SCR6, SCR1 ~ SCR6 are after two liang in series, and its both ends are connected with reactor L1 one end through hall current sensor TA1 and hall sensor TA2 respectively, three secondary coil of transformer T1 connects respectively between two thyristor SCR positive pole and negative pole in series, transformer T1's secondary coil common terminal is connected with the weldment, reactor L1 other end is connected with the resistance-capacitance return circuit, resistance-capacitance return circuit 2 connects between electrode and weldment, and ground connection.
Preferably, the resistance-capacitance loop comprises a resistor R1, capacitors C1-C3, the series connection of the capacitors C1 and C2 is grounded, and the series circuit of the resistor R1, the capacitors C1 and C2 and the capacitor C3 are sequentially connected between the electrode and the weldment side by side.
Preferably, the model of the SCR 1-SCR 6 is KP800A600V-KT39cT-Y40KPCn.
The utility model has the advantages that: the output polarity is switched by utilizing the positive and negative three-phase half-wave rectification mode, an interface cable is not required to be switched by adopting a manual mode, the integration on an automatic production line is facilitated, and the welding operation efficiency is improved.
Drawings
FIG. 1 is a circuit configuration diagram of a variable polarity circuit of a DC submerged arc welding power supply according to one embodiment.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a variable polarity circuit of a direct current submerged arc welding power supply comprises a transformer T1, a controllable rectifying circuit 1, a hall current sensor TA1/TA2, a reactor L1 and a resistance-capacitance loop 2, wherein a primary coil of the transformer T1 is connected with a three-phase power supply, the controllable rectifying circuit 1 comprises thyristors SCR 1-SCR 6, after the two thyristors SCR 1-SCR 6 are connected in series, two ends of the SCR 1-SCR 6 are respectively connected with one end of the reactor L1 through the hall current sensor TA1 and the hall sensor TA2, three secondary coils of the transformer T1 are respectively connected between an anode and a cathode of the two thyristors SCR connected in series, a common end of the secondary coil of the transformer T1 is connected with a weldment, the other end of the reactor L1 is connected with the resistance-capacitance loop 2, and the resistance-capacitance loop 2 is connected between the electrode and the weldment and grounded. Specifically, in this embodiment, the transformer T1 is a step-down transformer, which steps down the 380V ac output by the three-phase power supply to obtain 90V ac, then the ac is changed into dc by the controllable rectifying circuit 1, the dc is sampled by the hall sensor 2, and the sampled information is sent to a controller (not shown in the figure) for operation, so as to control the conduction angle of the thyristor in the controllable rectifying circuit, and adjust the dc voltage, thereby realizing the adjustment of the output dc.
The controllable rectifying circuit 1 comprises 6 thyristors SCR 1-SCR 6, wherein SCR1/4, SCR2/5 and SCR3/6 are sequentially connected in series, namely, the anode of the SCR1 is connected with the cathode of the SCR4, and the like. The high-voltage alternating current is reduced to low-voltage alternating current through the transformer, and then the low-voltage alternating current is rectified through the thyristor, and the thyristor voltage regulation has the advantages of wide regulation range, high response speed, high efficiency and the like. The gates of the SCRs 1-6 are connected with a controller, the controller inputs trigger pulses to the controller, and the conducting magnitude of the thyristors SCR is smaller than the frequency f of the trigger pulses. The types of thyristors SCR 1-SCR 6 used in the utility model are KP800A600V-KT39cT-Y40KPCn. Further, three secondary windings of the transformer T1 are respectively connected with the connection parts of two thyristors SCR, and in the utility model, secondary three-phase output is sequentially connected with the connection parts of SCR1/4, SCR2/5 and SCR 3/6.
When direct current positive connection is needed (the welding piece is the positive electrode), the conduction of the SCR4/SCR5/SCR6 is controlled only through the controller, the SCR1/SCR2/SCR3 is not conducted, the rectified direct current negative electrode is sampled through the Hall sensor TA2, filtering is carried out on the reactor L1, the electrode is reached, the electrode is realized to be the negative electrode, and the welding piece is the positive electrode. When direct current reverse connection is needed (welding piece is a negative electrode), only the conduction angles of SCR1, SCR2 and SCR3 are controlled, SCR4, SCR5 and SCR6 are not conducted, the rectified direct current positive electrode is sampled through a Hall current sensor TA1, the direct current positive electrode reaches an electrode after being filtered by a reactor L1, the electrode is realized to be the positive electrode, and the welding piece is the negative electrode.
As shown in fig. 1, the rc circuit 2 includes a resistor R1, capacitors C1 to C3, the series connection of the capacitors C1 and C2, and the connection of the capacitors C1 and C2 is grounded, the series circuit of the resistor R1, the capacitors C1 and C2, and the capacitor C3 are sequentially connected between the electrode and the weldment side by side, C1 to C3 are anti-interference capacitors, R1 is the minimum load resistance, and when no welding arc is established, the minimum holding current is provided for the thyristor.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (3)
1. A variable polarity circuit for a dc submerged arc welding power supply, characterized by: the controllable rectifying circuit comprises a transformer T1, a Hall current sensor TA1/TA2, a reactor L1 and a resistance-capacitance loop, wherein primary coils of the transformer T1 are connected with a three-phase power supply, the controllable rectifying circuit comprises thyristors SCR 1-SCR 6, after the SCR 1-SCR 6 are connected in series in pairs, two ends of the controllable rectifying circuit are respectively connected with one end of the reactor L1 through the Hall current sensor TA1 and the Hall sensor TA2, three secondary coils of the transformer T1 are respectively connected between an anode and a cathode of the two thyristors SCR in series, a common end of the secondary coil of the transformer T1 is connected with a weldment, the other end of the reactor L1 is connected with the resistance-capacitance loop, and the resistance-capacitance loop 2 is connected between an electrode and the weldment and grounded.
2. A variable polarity circuit of a dc submerged arc welding power supply as claimed in claim 1, wherein: the resistance-capacitance loop comprises a resistor R1, capacitors C1-C3, the capacitors C1 and C2 are connected in series, the connection part is grounded, and the resistor R1, the series circuit of the capacitors C1 and C2 and the capacitor C3 are sequentially connected between the electrode and the weldment in parallel.
3. A variable polarity circuit of a dc submerged arc welding power supply as claimed in claim 1, wherein: the models of the SCR 1-SCR 6 are KP800A600V-KT39cT-Y40KPCn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321375216.7U CN220050376U (en) | 2023-05-31 | 2023-05-31 | Variable polarity circuit of direct current submerged arc welding power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321375216.7U CN220050376U (en) | 2023-05-31 | 2023-05-31 | Variable polarity circuit of direct current submerged arc welding power supply |
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| Publication Number | Publication Date |
|---|---|
| CN220050376U true CN220050376U (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321375216.7U Active CN220050376U (en) | 2023-05-31 | 2023-05-31 | Variable polarity circuit of direct current submerged arc welding power supply |
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| Country | Link |
|---|---|
| CN (1) | CN220050376U (en) |
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2023
- 2023-05-31 CN CN202321375216.7U patent/CN220050376U/en active Active
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