CN115365625A - Circuit and equipment for cutting and welding - Google Patents
Circuit and equipment for cutting and welding Download PDFInfo
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- CN115365625A CN115365625A CN202211061247.5A CN202211061247A CN115365625A CN 115365625 A CN115365625 A CN 115365625A CN 202211061247 A CN202211061247 A CN 202211061247A CN 115365625 A CN115365625 A CN 115365625A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a circuit and a device for cutting and welding, wherein the circuit comprises: the VRD module is connected with the power supply module; the power supply module is connected with the control module and the output end; the VRD module is connected between the control module and the output end; when in the cutting mode, the control module is used for responding to a cutting mode control instruction, controlling the VRD module to be closed and controlling the power supply module to output a first electric signal through the output end; when in a welding mode, the control module is used for responding to a welding mode control instruction, controlling the power supply module to be disconnected and controlling the VRD module to be connected; the VRD module is used for outputting a second electric signal when being conducted according to the control signal of the control module; the control module is connected with the output end and is also used for controlling the VRD module to be closed according to the change state of the second electric signal of the output end and controlling the power supply module to output a third electric signal through the output end. The technical scheme provided by the embodiment of the invention improves the utilization rate of the device and reduces the cost of the circuit.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a circuit and equipment for cutting and welding.
Background
Plasma cutting is a high-speed and high-precision metal material cutting method, and compared with traditional flame cutting, the plasma cutting is more and more widely applied to the field of metal cutting by virtue of the advantages of high cutting speed, good cutting quality and the like. With the popularization of the plasma cutting application, the requirements of users on the plasma cutting machine with the welding function are gradually increased.
Although the cutting and the welding are controlled by constant currents, the plasma cutting is low in current and high in voltage, the welding is high in current and low in voltage, and the existing equipment which meets the requirements of the cutting and the welding simultaneously has the problems of low device utilization rate and high circuit cost.
Disclosure of Invention
The invention provides a circuit and equipment for cutting and welding, and aims to solve the problems of low device utilization rate and high circuit cost of the existing equipment which meets the requirements of cutting and welding at the same time.
According to an aspect of the present invention, there is provided a circuit for cutting and welding, including:
the VRD module is connected with the output end of the power supply module;
the power supply module is connected with the control module and the output end, and the output end is used for outputting an electric signal; the VRD module is connected between the control module and the output end;
in the cutting mode, the control module is used for responding to a cutting mode control instruction, controlling the VRD module to be closed and controlling the power supply module to output a first electric signal through the output end; wherein the first electrical signal is used for cutting;
when in a welding mode, the control module is used for responding to a welding mode control instruction, controlling the power supply module to be disconnected and controlling the VRD module to be connected; the VRD module is used for outputting a second electric signal through the output end when being conducted according to the control signal of the control module; the control module is connected with the output end and is also used for controlling the VRD module to be closed according to the change state of the second electric signal at the output end and controlling the power supply module to output a third electric signal through the output end; wherein the third electrical signal is used for welding.
Optionally, the circuit for cutting and welding further includes: an arc voltage feedback module is used for feeding back the arc voltage,
the control module is connected with the output end through the arc voltage feedback module, and the arc voltage feedback module is used for acquiring an electric signal of the output end; the control module is also used for generating a first control signal according to the received electric signal;
the first control signal is used for controlling the VRD module to be closed and controlling the power supply module to output a third electric signal through the output end, and the third electric signal is used for welding.
Optionally, the power module includes:
the control module is connected with the primary side of the transformer, and the rectifier bridge is connected between the secondary side of the transformer and the output end;
the inverter is used for switching on or switching off according to the control signal of the control module.
Optionally, the circuit for cutting and welding further comprises:
the VRD module is connected between the power supply and the output end; in a welding mode, the VRD module is used for conducting according to a control signal of the control module, and the output end of the VRD module is used for outputting a second electric signal; the second electrical signal comprises a no-load voltage signal of a welding mode;
the arc voltage feedback module detects an electric signal at an output end; the control module is used for receiving the electric signal and comparing the electric signal with a preset threshold value, and when the electric signal is smaller than the preset threshold value, the control module generates a first control signal; when the electric signal is greater than or equal to the preset threshold value, the control module generates a second control signal;
the first control signal is used for controlling the VRD module to be closed; controlling the inverter to output a third electric signal, wherein the third electric signal comprises a current signal for welding; the second control signal is used for controlling the inverter to be turned off, controlling the VRD module to be turned on and outputting a second electric signal through the output end.
Optionally, the arc voltage feedback module includes:
the device comprises an input interface, a voltage division unit and an output interface;
the input interface is connected with the output end, the voltage division unit is connected between the input interface and the output interface, the output interface is connected with the control module, and the output interface is used for outputting an electric signal to the control module.
Optionally, the arc voltage feedback module further includes: a voltage following module for the voltage of the power supply,
the voltage following module is connected between the output end and the voltage dividing unit and used for amplifying the electric signal output by the output end and outputting the amplified electric signal to the voltage dividing unit.
Optionally, the VRD module includes:
the first end of the switch module is connected with the power supply, the second end of the switch module is connected with the output end, the control end of the switch module is connected with the control module, and the switch module is used for being switched off according to a first control signal received by the control end and being switched on according to a second control signal received by the control end.
Optionally, the switch module includes:
the first switch tube and the second switch tube;
the first end of the first switch tube is connected with the power supply, the second end of the first switch tube is grounded, and the control end of the first switch tube is connected with the control module;
the first end of the second switch tube is connected with the power supply, the second end of the second switch tube is connected with the output end, and the control end of the second switch tube is connected with the first end of the first switch tube.
Optionally, the inverter comprises: a full bridge inverter and a drive unit;
the full-bridge inverter is connected with the driving unit, the driving unit is connected between the full-bridge inverter and the control module, and the driving unit is used for conducting according to a second control signal; the full-bridge inverter is used for outputting the first electric signal or the third electric signal through the driving unit.
According to another aspect of the present invention, there is provided an apparatus for cutting and welding, including a circuit for cutting and welding.
The technical scheme provided by the embodiment of the invention realizes that when the target user selects the cutting mode, the VRD module is controlled to be in the closed state, and a first electric signal for cutting is output through the output end, wherein the first electric signal is used for cutting operation. When the target user selects the welding mode, the power supply module is controlled to be in a closed state, and no electric signal is output to the output end. The control module controls the VRD module to be conducted, the VRD module outputs a second electric signal to the output end, the first electric signal output by the output end serves as no-load voltage of a welding mode, and when a welding rod contacts a workpiece, the electric signal output by the output end is reduced. The control module controls the VRD module to be closed according to the electric signal output by the output end, the power supply module is synchronously turned on, and the power supply module outputs a third electric signal, so that the welding operation can be carried out. The technical scheme provided by the embodiment of the invention adopts the same set of power supply module, realizes a circuit for cutting and welding, has a simple circuit structure, and reduces the device cost of the circuit for cutting and welding.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a circuit for performing both cutting and soldering according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another circuit for cutting and welding according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another circuit for cutting and welding according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit for cutting and welding according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another circuit for cutting and welding according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an arc voltage feedback module and a VRD module of a circuit capable of achieving both cutting and welding according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an apparatus capable of achieving both cutting and welding according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a circuit capable of achieving both cutting and welding according to an embodiment of the present invention. Referring to fig. 1, a circuit for achieving both cutting and welding according to an embodiment of the present invention includes: the device comprises a power module 10, a VRD module 4, an output end 5 and a control module 6; the power supply module 10 is connected with the control module 6 and the output end 5, and the output end 5 is used for outputting an electric signal; the VRD module 4 is connected between the control module 6 and the output end 5; in the cutting mode, the control module 6 is used for responding to a cutting mode control instruction, controlling the VRD module 4 to be closed, and controlling the power module 10 to output a first electric signal through the output end 5; wherein the first electrical signal is used for cutting; in the welding mode, the control module 6 is used for responding to a welding mode control instruction, controlling the power module 10 to be disconnected and controlling the VRD module 4 to be connected; the VRD module 4 is used for outputting a second electric signal through the output end 5 when being conducted according to the control signal of the control module 6; the control module 6 is connected with the output end 5, and the control module 6 is further configured to control the VRD module 4 to be turned off according to a change state of the second electrical signal at the output end, and control the power module 10 to output a third electrical signal through the output end 5; wherein the third electrical signal is used for welding.
Specifically, the power module 10 is used for outputting an electrical signal. The power module 10 may convert the ac signal to a dc signal. A VRD (voltage dropping device) module 4 is connected between the control module 6 and the output 5. The cutting mode control command may be triggered by the target user when a cut is desired on the workpiece. In the cutting mode, the control module 6 is used for responding to a cutting mode control instruction, controlling the VRD module 4 to be closed, and controlling the power module 10 to output a first electric signal through the output end 5; wherein the first electrical signal is used for cutting. The first electrical signal required for the cutting mode is a low current and high voltage, for example, the working voltage of the cutting reaches above 100V, and the no-load voltage of the cutting is generally between 200V-300V dc.
Illustratively, when the target user selects the cutting mode, the VRD module 4 is in the off state and outputs a first electrical signal for cutting through the output terminal 5, which is used for the cutting operation.
In a welding mode, welding generally needs large current and low voltage, the working current generally exceeds 100A, and the working voltage generally does not exceed 40V, so the no-load voltage generally does not exceed 80V. The control module 6 is connected to the output terminal 5, and the control module 6 is configured to control a conduction state of the power module 10 and the VRD module 4 according to an electrical signal at the output terminal 5. Since the VRD module 4 can provide a lower second electrical signal to the output terminal 5 when it is turned on, the second electrical signal can be set to a dc voltage not higher than 36V as a no-load voltage in a welding state.
When the welding rod contacts the workpiece while the target user performs the welding operation, the electric signal output from the output terminal 5 is decreased. The control module 6 controls the VRD module 4 to be closed according to the electric signal output by the output end 5, and synchronously turns on the power module 10, and the power module 10 outputs a third electric signal, so that the welding operation can be carried out. The third electric signal is a current signal, and the arc voltage is determined by the arc length because the current output by the output end 5 is only required to be controlled in the welding process. After the welding, when promoting the welding rod, the arc pressure can become high, and control module 6 closes according to the higher arc pressure feedback value of output 5, control power module 10 to open VRD module 4 simultaneously, make VRD module 4 provide lower second signal of telecommunication to output 5, as welding state's no-load voltage.
The technical scheme provided by the embodiment of the invention realizes that when a target user selects a cutting mode, the VRD module 4 is controlled to be in a closed state, and a first electric signal for cutting is output through the output end 5, wherein the first electric signal is used for cutting operation. When the target user selects the welding mode, the power module 10 is controlled to be in the off state, and no electric signal is output to the output terminal 5 by the power module 10. The control module 6 controls the VRD module 4 to be conducted, the VRD module 4 outputs a second electric signal to the output end 5, the first electric signal output by the output end 5 serves as no-load voltage of a welding mode, and when a welding rod contacts a workpiece, the electric signal output by the output end 5 is reduced. The control module 6 controls the VRD module 4 to be closed according to the electric signal output by the output end 5, and synchronously turns on the power module 10, and the power module 10 outputs a third electric signal, so that the welding operation can be carried out. The technical scheme provided by the embodiment of the invention adopts the same set of power supply module 10, realizes a circuit with dual purposes of cutting and welding, simplifies the circuit structure and reduces the device cost of the circuit with dual purposes of cutting and welding.
Optionally, fig. 2 is a schematic structural diagram of another circuit capable of achieving both cutting and welding according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the circuit capable of achieving both cutting and welding provided by the embodiment of the present invention further includes: the control module 6 is connected with the output end 5 through the arc voltage feedback module 3, and the arc voltage feedback module 3 is used for acquiring an electric signal of the output end 5; the control module 6 is further configured to generate a first control signal according to the received electrical signal; the first control signal is used for controlling the VRD module 4 to be turned off and controlling the power module 10 to output a third electrical signal through the output end 5, wherein the third electrical signal is used for welding.
Specifically, the arc voltage feedback module 3 is connected with the output end 5, and the arc voltage feedback module 3 is used for acquiring an electric signal output by the output end 5 and feeding the acquired electric signal back to the control module 6. The control module 6 generates a first control signal from the received electrical signal. The VRD module 4 is turned off according to the first control signal, the power module 10 is turned on according to the first control signal, and outputs a third electrical signal, which may be a current signal for welding.
Fig. 3 is a schematic structural diagram of another circuit capable of performing both cutting and welding according to an embodiment of the present invention. Fig. 4 is a schematic diagram of another apparatus for implementing a dual-purpose circuit for cutting and welding according to an embodiment of the present invention. On the basis of the above embodiment, with reference to fig. 3 and 4, the power module 10 may include: the system comprises an inverter 7, a transformer 1 and a rectifier bridge 2, wherein the inverter 7 is respectively connected with the primary side of the transformer 1 and a control module 6, and the rectifier bridge 2 is connected between the secondary side of the transformer 1 and an output end 5; the inverter 7 is used for switching on or off according to a control signal of the control module 6.
Specifically, the inverter 7 is connected to the transformer 1 and the control module 6, the control module 6 is configured to output a control signal according to the working mode, and the control signal is configured to control the inverter 7 to start. The rectifier bridge 2 is connected between the transformer 1 and the output end 5, and the rectifier bridge 2 is used for converting the alternating current signal output by the transformer 1 into a direct current signal and outputting the direct current signal through the output end 5. The high-voltage side of the transformer 1 is connected with the inverter 7, and the low-voltage side of the transformer 1 is connected with the input end of the rectifier bridge. The transformer 1 and the rectifier bridge 2 can be designed according to the topological form of the cutting circuit, namely the transformer 1 is designed according to the rated value of the voltage and the current required by cutting. The rectifier bridge may comprise full bridge rectification. The inverter 7 is used for switching on or off according to a control signal of the control module 6.
Specifically, the second control signal is used to control the inverter 7, and the inverter 7 is turned on or off according to the second control signal sent by the control module 6. When the inverter 7 is switched on, alternating current is output to the transformer 1, the transformer 1 can output a current signal for cutting or welding, when the inverter 7 is switched off, no current is output outwards, and the transformer 1 cannot output a current signal for cutting or welding.
Fig. 5 is a schematic structural diagram of another circuit capable of achieving both cutting and welding according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the circuit for cutting and welding provided by the embodiment of the invention further comprises a power supply 8, a vrd module is connected between the power supply 8 and the output terminal 5; in a welding mode, the VRD module 4 is used for conducting according to a control signal of the control module 6, and the output end 5 is used for outputting a second electric signal; the second electrical signal comprises a no-load voltage signal of a welding mode; the arc voltage feedback module 3 detects an electric signal of the output end 5; the control module 6 is configured to receive the electrical signal, compare the electrical signal with a preset threshold, and when the electrical signal is smaller than the preset threshold, the control module 6 generates a first control signal; when the electric signal is greater than or equal to the preset threshold, the control module 6 generates a second control signal; wherein, the first control signal is used for controlling the VRD module 4 to close; and controls the inverter 7 to output a third electric signal including a current signal for welding; the second control signal is used for controlling the inverter 7 to be turned off, controlling the VRD module 4 to be turned on, and outputting a second electric signal through the output end 5.
Specifically, the power supply 8 may be a 15V dc voltage, and the VRD module 4 is connected between the power supply 8 and the output terminal 5. In a welding mode, the VRD module 4 is conducted according to a control signal of the control module 6, and the output end 5 outputs a second electric signal; the second electrical signal comprises a no-load voltage signal for the welding mode, for example 36 vdc.
If the welding rod is not contacted with the workpiece, the output end 5 is in a no-load state and outputs a no-load voltage signal. After the welding rod is contacted with a workpiece, the electric signal of the output end 5 is reduced, the arc voltage feedback module 3 detects the electric signal and compares the electric signal with a preset threshold value, and when the electric signal is smaller than the preset threshold value, the control module 6 generates a first control signal to control the VRD module 4 to be closed and control the inverter 7 to output a third electric signal for welding. When the electric signal is greater than or equal to the preset threshold, the control module 6 generates a second control signal, controls the inverter 7 to be turned off, controls the VRD module 4 to be turned on, and outputs the second electric signal serving as a no-load voltage signal through the output end 5.
Optionally, fig. 6 is a schematic structural diagram of an arc voltage feedback module and a VRD module that can implement a circuit for both cutting and welding according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the arc voltage feedback module 3 includes an input interface 31, a voltage dividing unit 32, and an output interface 33; the input interface 31 is connected with the output end 5, the voltage dividing unit 32 is connected between the input interface 31 and the output interface 33, the output interface 33 is connected with the control module 6, and the output interface 33 is used for outputting a direct current signal to the control module 6.
Specifically, the input interface 31 is connected to the output terminal 5, and the input interface 31 is used for acquiring an electrical signal of the output terminal 5. The voltage dividing unit 32 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the input interface 31, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and the input interface 33, and a second end of the second resistor R2 is grounded. The voltage dividing unit 32 is used for dividing voltage and reducing the impact of the electric signal on the control module 6.
Optionally, on the basis of the foregoing embodiment, with reference to fig. 6, the arc voltage feedback module 3 may further include a voltage following module 34, where the voltage following module 34 is connected between the output end 5 and the voltage dividing unit 32, and the voltage following module 34 is configured to amplify the electrical signal output by the output end 5, and output the amplified electrical signal to the voltage dividing unit 32.
Specifically, the input interface 31 is connected with the output end 5, and the voltage dividing unit 32 is connected between the input interface 31 and the input interface 33; the input interface 33 is connected with the control module 6, and the voltage following module 34 is connected between the output end 5 and the voltage dividing unit 32. After receiving the dc signal at the output end 5, the input interface 31 amplifies the dc signal by the voltage follower module 34 and outputs the amplified dc signal to the voltage divider unit 32, and the voltage divider unit 32 outputs the dc signal to the input interface 33 and finally to the control module 6 by the input interface 33.
Optionally, with reference to fig. 6, the vrd module 4 includes a switch module 41, a first terminal of the switch module 41 is connected to the power supply 8, a second terminal of the switch module 41 is connected to the output terminal 5, a control terminal of the switch module 41 is connected to the control module 6, and the switch module 41 is configured to turn off according to a first control signal received by the control terminal and turn on according to a second control signal received by the control terminal.
Specifically, the switch module 41 has a first end connected to the power supply 8, a second end connected to the output end 5, and a control end connected to the control module 6. When the circuit is in the cutting mode, the VRD module 4 is turned off according to the control signal. When the circuit is in the welding mode, the control module 6 sends a control signal to the control end of the switch module 41 to turn on the switch module 41, connects the power supply 8 with the output end 5, and outputs a second electrical signal as a welding no-load voltage. When the welding rod contacts with the workpiece, the switch module 41 is turned off according to the first control signal received by the control terminal, the power module 10 is turned on, and a third electric signal for welding is output. When the welding rod is separated from the workpiece again, the switch module 41 is turned on when the control end receives the second control signal, the power supply 8 is connected with the output end 5, and the second electric signal is output as the no-load welding voltage.
Alternatively, on the basis of the above embodiment, with continuing reference to fig. 6, the switch module 41 includes a first switch tube Q5 and a second switch tube Q4; a first end of the first switching tube Q5 is connected with the power supply 8, a second end of the first switching tube Q5 is grounded, and a control end of the first switching tube Q5 is connected with the control module 6; the first end of the second switch tube Q4 is connected to the power supply 8, the second end of the second switch tube Q4 is connected to the output end 5, and the control end of the second switch tube Q4 is connected to the first end of the first switch tube Q5.
Specifically, the control signal output by the control module 6 is, for example, a level signal, and the first switch tube Q5 is turned on according to the level signal. A voltage dividing resistor can be arranged between the first end of the first switch tube Q5 and the control end of the second switch tube Q4, when the first switch tube Q5 is switched on, the control end of the second switch tube Q4 receives a control signal to be switched on, so that the power supply 8 is connected with the output end 5, and the output end 5 outputs a second electric signal serving as the welding no-load voltage. When the first switching tube Q5 is turned off according to the control signal of the control module 6, the control end of the second switching tube Q4 does not receive the control signal, and the second switching tube Q4 disconnects the power supply 8 from the output end 5. Illustratively, when the circuit is in welding mode, the output 5 is in a no-load condition and the power supply 8 is maintained at a relatively low voltage condition. Illustratively, the power supply 8 voltage is 15V.
Alternatively, on the basis of the above embodiment, the inverter 7 may include a full-bridge inverter and a driving unit; the full-bridge inverter is connected with the driving unit, the driving unit is connected between the full-bridge inverter and the control module 6, and the driving unit is used for conducting according to a second control signal; the full-bridge inverter is used for outputting the first electric signal or the third electric signal through the driving unit. .
Specifically, the full-bridge inverter is connected with the driving unit and used for outputting a second current signal according to the driving unit. The driving unit is connected between the full-bridge inverter and the control module 6 and is used for conducting according to a second control signal. When the driving unit is conducted according to the second control signal, the full-bridge inverter outputs the first electric signal or the third electric signal through the driving unit.
Fig. 7 is a schematic structural diagram of an apparatus for performing both cutting and welding according to an embodiment of the present invention. On the basis of the above embodiments, referring to fig. 7, an apparatus 200 for cutting and welding provided by the embodiments of the present invention, including the circuit 100 for cutting and welding provided by any of the foregoing embodiments of the present disclosure, has the beneficial effects of the circuit 100 for cutting and welding provided by any of the foregoing embodiments.
Illustratively, referring to fig. 3, 4 and 7, the device for cutting and welding provided by the embodiment of the invention has two modes of cutting and welding.
When the device capable of realizing cutting and welding provided by the embodiment of the invention is in a cutting mode, the control module 6 closes the VRD module 4, a first signal is obtained through the isolation voltage reduction of the transformer 1 and the rectification of the rectifier bridge 2, and the cutting operation is carried out through the first signal.
When the device capable of achieving the dual purposes of cutting and welding provided by the embodiment of the invention is in the welding mode, the device capable of achieving the dual purposes of cutting and welding provided by the embodiment of the invention is in the no-load state, the control module 6 can also send a control signal for controlling the inverter 7, the inverter 7 can be turned off according to the control signal sent by the control module 6, and at the moment, the control module 6 turns on the VRD module 4 to enable the no-load voltage to be in the second lower electric signal.
When operating personnel carries out welding operation, the welding rod contacts the work piece, and the welding rod contacts the back with the work piece, and the voltage of output 5 will descend, and the signal of telecommunication of output weakens, and arc voltage feedback module 3 detects this signal of telecommunication and compares it with presetting the threshold value, generates first control signal when the signal of telecommunication is less than presetting the threshold value. The first control signal is used for controlling the VRD module 4 to be closed, and after the VRD module 4 is closed, the first control signal is also used for controlling the inverter 7 to be conducted, the inverter 7 outputs a third electric signal, the voltage of the output end 5 is increased, and welding is carried out.
After welding, the welding rod leaves the workpiece, the arc voltage is increased, when the arc voltage feedback module 3 detects that the electric signal of the output end 5 is greater than or equal to the preset threshold value, the inverter 7 can send a control signal to turn off according to the control module 6, and the control module 6 controls the VRD module 4 to be opened again to return to the no-load state again.
The device capable of realizing the cutting and welding dual-purpose provided by the embodiment of the invention realizes the two functions of equal cutting and welding by only adopting one circuit, the main circuit devices such as a transformer and a rectifier bridge have less consumption and low electrical cost, the output end is shared by the two output modes of cutting and welding, a target user has no risk of connecting wrong interfaces, and the safety is higher.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A circuit for cutting and welding, the circuit comprising:
the VRD module is connected with the output end of the power supply module;
the power supply module is connected with the control module and the output end, and the output end is used for outputting an electric signal; the VRD module is connected between the control module and the output end;
when in a cutting mode, the control module is used for responding to a cutting mode control instruction, controlling the VRD module to be closed and controlling the power supply module to output a first electric signal through the output end; wherein the first electrical signal is used for cutting;
when in a welding mode, the control module is used for responding to a welding mode control instruction, controlling the power supply module to be disconnected and controlling the VRD module to be connected; the VRD module is used for outputting a second electric signal through the output end when the VRD module is conducted according to the control signal of the control module; the control module is connected with the output end and is also used for controlling the VRD module to be closed according to the change state of the second electric signal of the output end and controlling the power supply module to output a third electric signal through the output end; wherein the third electrical signal is used for welding.
2. The circuit for cutting and welding of claim 1, further comprising: an arc voltage feedback module is used for feeding back the arc voltage,
the control module is connected with the output end through the arc voltage feedback module, and the arc voltage feedback module is used for acquiring an electric signal of the output end; the control module is further used for generating a first control signal according to the received electric signal;
the first control signal is used for controlling the VRD module to be closed and controlling the power supply module to output the third electric signal through the output end, and the third electric signal is used for welding.
3. The circuit for cutting and welding of claim 2, wherein the power module comprises:
the inverter is respectively connected with the primary side of the transformer and the control module, and the rectifier bridge is connected between the secondary side of the transformer and the output end;
the inverter is used for switching on or switching off according to the control signal of the control module.
4. The circuit for cutting and welding of claim 3, further comprising:
a power supply, the VRD module connected between the power supply and the output; in a welding mode, the VRD module is used for conducting according to a control signal of the control module, and the output end is used for outputting a second electric signal; the second electrical signal comprises a no-load voltage signal of a welding mode;
the arc voltage feedback module detects the electric signal of the output end; the control module is used for receiving the electric signal and comparing the electric signal with a preset threshold value, and when the electric signal is smaller than the preset threshold value, the control module generates a first control signal; when the electric signal is greater than or equal to a preset threshold value, the control module generates a second control signal;
wherein the first control signal is used for controlling the VRD module to be closed; and controlling the inverter to output a third electrical signal, the third electrical signal comprising a current signal for welding; the second control signal is used for controlling the inverter to be turned off, controlling the VRD module to be turned on and outputting the second electric signal through the output end.
5. The circuit for cutting and welding of claim 2, wherein the arc voltage feedback module comprises:
the device comprises an input interface, a voltage division unit and an output interface;
the input interface is connected with the output end, the voltage dividing unit is connected between the input interface and the output interface, the output interface is connected with the control module, and the output interface is used for outputting an electric signal to the control module.
6. The circuit for cutting and welding of claim 5 wherein the arc voltage feedback module further comprises: a voltage following module for the voltage following module,
the voltage following module is connected between the output end and the voltage dividing unit, and is used for amplifying the electric signal output by the output end and outputting the amplified electric signal to the voltage dividing unit.
7. The circuit for cutting and welding of claim 4, wherein the VRD module comprises:
the first end of the switch module is connected with the power supply, the second end of the switch module is connected with the output end, the control end of the switch module is connected with the control module, and the switch module is used for being switched off according to a first control signal received by the control end and being switched on according to a second control signal received by the control end.
8. The circuit for cutting and welding of claim 7, wherein the switch module comprises:
the first switch tube and the second switch tube;
the first end of the first switch tube is connected with a power supply, the second end of the first switch tube is grounded, and the control end of the first switch tube is connected with the control module;
the first end of the second switch tube is connected with the power supply, the second end of the second switch tube is connected with the output end, and the control end of the second switch tube is connected with the first end of the first switch tube.
9. The circuit for cutting and welding as defined in claim 3, wherein the inverter comprises: a full bridge inverter and a drive unit;
the full-bridge inverter is connected with the driving unit, the driving unit is connected between the full-bridge inverter and the control module, and the driving unit is used for conducting according to the second control signal; the full-bridge inverter is used for outputting the first electric signal or the third electric signal through the driving unit.
10. An apparatus for cutting and welding, comprising: the electrical circuit for cutting and welding of any of claims 1-9.
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| CN202211061247.5A CN115365625B (en) | 2022-08-31 | 2022-08-31 | Circuit and device for cutting and welding |
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| CN202211061247.5A CN115365625B (en) | 2022-08-31 | 2022-08-31 | Circuit and device for cutting and welding |
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| CN115365625B (en) | 2023-09-22 |
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