CN218016309U - Welding current control system of inverter stud welding machine - Google Patents
Welding current control system of inverter stud welding machine Download PDFInfo
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- CN218016309U CN218016309U CN202222283625.6U CN202222283625U CN218016309U CN 218016309 U CN218016309 U CN 218016309U CN 202222283625 U CN202222283625 U CN 202222283625U CN 218016309 U CN218016309 U CN 218016309U
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Abstract
The utility model discloses an contravariant stud welding machine welding current control system, its technical scheme main points are: the power supply control circuit comprises a switching signal, wherein an MCU (microprogrammed control unit) is electrically connected to the switching signal, a driving unit is electrically connected to the MCU, a control power supply unit is electrically connected to the driving unit, and a controllable rectifying unit is electrically connected to the driving unit; the drive unit is by the circuit that optical coupler U1, a plurality of diode and a plurality of triode are constituteed, control transformer AC9V coil among the control power supply unit forms half-wave rectification and filtering compensation through diode D1, electric capacity C1 and electric capacity C2, including rectifier bridge, control transformer AC63V coil and inductance L1 component in the controllable rectifier unit. The independent arc striking output circuit of the utility model has simpler control structure and does not destroy the original inversion integral structure; independent driving, striking, power mode of operation guarantee that the fault rate is extremely low.
Description
Technical Field
The utility model relates to a stud welding machine field, in particular to contravariant stud welding machine welding current control system.
Background
Stud welding is a method in which one end of a stud is contacted with the surface of a plate (or a pipe fitting), arc striking is carried out by electrifying, and after the contact surface is melted, the stud is welded under certain pressure. The stud welding has the advantages of rapidness, reliability, simple operation, low cost and the like, and can replace the connection processes of riveting, drilling, manual arc welding, brazing and the like.
Referring to the existing Chinese patent with publication number CN2609702Y, the inverter type automatic stud welding machine is disclosed, which solves the problem of the traditional extensive control mode of the stud welding machine, and can realize accurate output of welding current by adopting an inverter circuit and multi-CPU control, so that the overall stability and welding success rate of welding are close to 100 percent. In addition, the welding device has the functions of cluster control, multi-path output and automatic welding, and is particularly suitable for the industries of automobile manufacturing, mechanical manufacturing, shipbuilding, household appliances and the like. However, the circuit described above still has some disadvantages, such as: the stud welding machine on the market welds and exceeds 16mm and above diameter, and the effect is generally all about almost, can both reach general customer's requirement. However, as the model (current increase) is increased, the defects of incomplete formation of craters, serious arc deflection and the like are highlighted for the welding effect of the small-diameter stud due to unstable large-current control.
SUMMERY OF THE UTILITY MODEL
To the problem mentioned in the background art, the utility model aims at providing an contravariant stud welding machine welding current control system to solve the problem mentioned in the background art.
The above technical object of the present invention can be achieved by the following technical solutions:
a welding current control system of an inverter stud welding machine comprises a switching signal, wherein an MCU (microprogrammed control unit) is electrically connected to the switching signal, a driving unit is electrically connected to the MCU, a control power supply unit is electrically connected to the driving unit, a controllable rectifying unit is electrically connected to the driving unit, and an implementation unit is electrically connected to the controllable rectifying unit;
the drive unit is by the circuit that optical coupler U1, a plurality of diode and a plurality of triode are constituteed, control transformer AC9V coil among the control power supply unit forms half-wave rectification and filtering compensation through diode D1, electric capacity C1 and electric capacity C2, including rectifier bridge, control transformer AC63V coil and inductance L1 component in the controllable rectifier unit.
By adopting the technical scheme, the utility model discloses guarantee the compatibility of big model welding machine to the minor diameter double-screw bolt, satisfy more extensive customer's requirement; the independent arc striking output circuit has simpler control structure and does not damage the original inversion integral structure; the failure rate is extremely low by the aid of independent driving, arc striking and power supply working modes; the MCU control unit sends a signal to the optocoupler U1 to conduct the four pins and the three pins, the voltage of the four pins is reduced, the triode Q2 conducts and works at the moment, the driving voltage reaches the silicon controlled rectifier module through the triode Q2, the resistor R6, the resistor R7, the diode D2 and the diode D3, the silicon controlled rectifier module works to generate direct-current voltage at the moment, and the direct-current voltage acts on the positive electrode and the negative electrode of the welding machine through the inductor L1 reactance to generate arc striking voltage; the welding time is accurately controlled by the singlechip control technology, the output arc striking voltage is driven to be stable enough in a short period time, and compared with the direct inversion output arc striking of the conventional stud welding machine, the arc striking machine is more accurate and stable, and is particularly suitable for welding small-diameter studs and thin plates; through improvement, arc striking welding is completed in two parts, and ms-level stable transition can be achieved, so that the welding is more stable.
Preferably, the MCU control unit comprises a time control module.
By adopting the technical scheme, the time control module is used for finishing accurate time control, the driving output arc striking voltage is stable enough in a short period of time, compared with the conventional stud welding machine which directly inverts to output arc striking, the arc striking control method is more accurate and stable, and is particularly suitable for welding small-diameter studs and thin plates, and arc striking welding is finished by two parts, so that ms-level stable transition can be achieved; the application range is wider, and the cost of a user is saved.
Preferably, one side of the diode D1 in the half-wave rectification and filtering compensation in the driving unit is electrically connected with an arrester F1, and the other end of the arrester F1 is electrically connected with one end of the AC9V coil of the control transformer.
By adopting the technical scheme, the lightning arrester F1 can effectively protect the safety of a circuit and realize driving power supply by controlling the AC9V coil of the transformer.
Preferably, the other end of the diode D1 is electrically connected with the capacitor C1 and the capacitor C2 which are connected in parallel, and the diode D1 is further electrically connected with the four pins of the optocoupler U1 through the resistor R3 and the resistor R2 which are connected in series.
By adopting the technical scheme, half-wave rectification and filtering compensation are realized through the diode D1, the capacitor C1 and the capacitor C2, stable output and operation of the circuit are maintained, and stable output of set protection voltage of the resistor R3 and the resistor R2 is realized.
Preferably, there is a 5V access end through resistance R1 electric connection on a pin of optocoupler U1, electric connection has triode Q1's collecting electrode on two pins of optocoupler U1, triode Q1's base with MCU the control unit electric connection, triode Q1's projecting pole electric ground, optocoupler U1's three pins with controllable rectifier unit electric connection, electric capacity C1 with electric capacity C2's the other end all with optocoupler U1's three pins with the interconnecting link electric connection of rectifier bridge.
Through adopting above-mentioned technical scheme, realize carrying out signal power supply to the system through the 5V input, the opto-coupler U1 of being convenient for carries out the transmission signal operation, and realizes carrying out control regulation to subsequent rectifier bridge.
Preferably, three pins of optocoupler U1 with electric connection has resistance R4 and resistance R5 on the connecting line of rectifier bridge, the other end electric connection of resistance R4 has diode D3, the other end electric connection of resistance R5 has diode D2, diode D3 with diode D2 respectively with rectifier bridge electric connection, diode D3 with diode D2 respectively through resistance R9 and resistance R8 with three pins of optocoupler U1 with the interconnecting link electric connection of rectifier bridge, between resistance R3 and resistance R2 with triode Q2's base electric connection, triode Q2's projecting pole with diode D1 with electric connection between resistance R3, electric connection has parallel connection's resistance R6 and resistance R7 on triode Q2's the collector, resistance R6 with resistance R7 respectively with resistance R5 with resistance R4 electric connection.
By adopting the technical scheme, the driving voltage is conveniently transmitted to the controllable rectifying unit through the arrangement of the electronic components, and arc striking and driving control of the system are realized.
Preferably, the control transformer AC63V coil is electrically connected to the rectifier bridge, two ends of the rectifier bridge are electrically connected to the welder output positive terminal and the welder output negative terminal, respectively, and the inductor L1 is electrically connected between the welder output negative terminal and the rectifier bridge.
By adopting the technical scheme, the AC63V coil of the transformer is controlled to realize welding power supply to the system, and the inductor L1 acts on the positive electrode and the negative electrode of the welding machine to generate arc striking voltage.
To sum up, the utility model discloses mainly have following beneficial effect:
the utility model ensures the compatibility of a large-sized welder to the small-diameter stud and meets wider customer requirements; the independent arc striking output circuit has simpler control structure and does not damage the original inversion integral structure; the failure rate is extremely low by the aid of independent driving, arc striking and power supply working modes; the MCU control unit sends a signal to the optocoupler U1 to conduct the four pins and the three pins, the voltage of the four pins is reduced, the triode Q2 conducts and works at the moment, the driving voltage reaches the silicon controlled rectifier module through the triode Q2, the resistor R6, the resistor R7, the diode D2 and the diode D3, the silicon controlled rectifier module works to generate direct-current voltage at the moment, and the direct-current voltage acts on the positive electrode and the negative electrode of the welding machine through the inductor L1 reactance to generate arc striking voltage; the welding time is accurately controlled by the singlechip control technology, the output arc striking voltage is driven to be stable enough in a short period time, and compared with the direct inversion output arc striking of the conventional stud welding machine, the arc striking machine is more accurate and stable, and is particularly suitable for welding small-diameter studs and thin plates; through improvement, arc striking welding is completed in two parts, and ms-level stable transition can be achieved, so that the welding is more stable.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Examples
Referring to fig. 1-2, a welding current control system of an inverter stud welding machine includes a switching signal, the switching signal is electrically connected to an MCU control unit, the MCU control unit is electrically connected to a driving unit, the driving unit is electrically connected to a control power supply unit, the driving unit is electrically connected to a controllable rectifying unit, and the controllable rectifying unit is electrically connected to an implementing unit;
the drive unit is by the circuit that optocoupler U1, a plurality of diode and a plurality of triode are constituteed, control transformer AC9V coil in the control power supply unit forms half-wave rectification and filtering compensation through diode D1, electric capacity C1 and electric capacity C2, including rectifier bridge, control transformer AC63V coil and inductance L1 constitution in the controllable rectifier unit.
The utility model ensures the compatibility of a large-sized welding machine to a small-diameter stud and meets wider customer requirements; the independent arc striking output circuit has simpler control structure and does not damage the original inversion integral structure; the failure rate is extremely low due to independent driving, arc striking and power supply working modes; the MCU control unit sends a signal to the optocoupler U1 to conduct the four pins and the three pins, the voltage of the four pins is reduced, the triode Q2 conducts and works at the moment, the driving voltage reaches the silicon controlled rectifier module through the triode Q2, the resistor R6, the resistor R7, the diode D2 and the diode D3, the silicon controlled rectifier module works to generate direct-current voltage at the moment, and the direct-current voltage acts on the positive electrode and the negative electrode of the welding machine through the inductor L1 reactance to generate arc striking voltage; the welding time is accurately controlled by the singlechip control technology, the output arc striking voltage is driven to be stable enough in a short period time, and compared with the direct inversion output arc striking of the conventional stud welding machine, the arc striking machine is more accurate and stable, and is particularly suitable for welding small-diameter studs and thin plates; through improvement, arc striking welding is completed in two parts, and ms-level stable transition can be achieved, so that welding is more stable.
In this embodiment, preferably, the MCU control unit includes a time control module therein. The method has the advantages that the time control module is used for completing the time accurate control, the driving output arc striking voltage is stable enough in a short period time, compared with the conventional stud welding machine which directly inverts to output the arc striking voltage, the method is more accurate and stable, the method is particularly suitable for welding small-diameter studs and thin plates, the arc striking welding is completed by two parts, and the ms-level stable transition can be achieved; the application range is wider, and the cost of a user is saved.
In this embodiment, preferably, one side of the diode D1 in the half-wave rectification and filtering compensation in the driving unit is electrically connected to the lightning arrester F1, and the other end of the lightning arrester F1 is electrically connected to one end of the AC9V coil of the control transformer. The lightning arrester F1 has the advantages that the safety of a circuit can be effectively protected due to the setting of the lightning arrester F1, and the driving power supply is realized by controlling the AC9V coil of the transformer.
In this embodiment, preferably, the other end of the diode D1 is electrically connected to the capacitor C1 and the capacitor C2 which are connected in parallel, and the diode D1 is further electrically connected to the four pins of the optocoupler U1 through the resistor R3 and the resistor R2 which are connected in series. The effect is that half-wave rectification and filtering compensation are realized through the diode D1, the capacitor C1 and the capacitor C2, the stable output and operation of the circuit are maintained, and the stable output of the set protection voltage of the resistor R3 and the resistor R2 is realized.
In this embodiment, it is preferred, there is the 5V incoming end through resistance R1 electric connection on the pin of optocoupler U1, electric connection has triode Q1's collecting electrode on two pins of optocoupler U1, triode Q1's base with MCU the control unit electric connection, triode Q1's projecting pole electric ground, optocoupler U1's three pins with controllable rectification unit electric connection, electric capacity C1 with electric capacity C2's the other end all with optocoupler U1's three pins with the interconnecting link electric connection of rectifier bridge. The effect does, realizes carrying out signal power supply to the system through the 5V input, and the opto-coupler U1 of being convenient for carries out the transmission signal operation, and realizes carrying out control regulation to subsequent rectifier bridge.
In this embodiment, it is preferable that three pins of the optocoupler U1 and the connection line of the rectifier bridge are electrically connected with a resistor R4 and a resistor R5, the other end of the resistor R4 is electrically connected with a diode D3, the other end of the resistor R5 is electrically connected with a diode D2, the diode D3 and the diode D2 are respectively electrically connected with the rectifier bridge, the diode D3 and the diode D2 are respectively through a resistor R9 and a resistor R8 and three pins of the optocoupler U1 and the connection line of the rectifier bridge, the base of the triode Q2 is electrically connected between the resistor R3 and the resistor R2, the emitter of the triode Q2 is electrically connected with the diode D1 and the resistor R3, the collector of the triode Q2 is electrically connected with a resistor R6 and a resistor R7 which are connected in parallel, and the resistor R6 and the resistor R7 are respectively electrically connected with the resistor R5 and the resistor R4. The controllable rectifier unit has the advantages that through the arrangement of the electronic components, the driving voltage is conveniently transmitted to the controllable rectifier unit, and arc striking and driving control over a system are achieved.
In this embodiment, preferably, the control transformer AC63V coil is electrically connected to the rectifier bridge, two ends of the rectifier bridge are electrically connected to the welder output positive terminal and the welder output negative terminal respectively, and the inductor L1 is electrically connected between the welder output negative terminal and the rectifier bridge. The effect is that the AC63V coil of the transformer is controlled to realize welding power supply to the system, and the inductor L1 acts on the positive electrode and the negative electrode of the welding machine to generate arc striking voltage.
The use principle and the advantages are as follows:
the driving unit and the MCU control unit form an independently controllable arc striking circuit, so that the output stability is ensured, the arc striking current is not too large under the condition of short cycle time, the driving unit adopts a high-speed optocoupler U1 to ensure the accuracy of the short cycle time, and the circuit is ensured to play a necessary role under the simple and effective condition by adopting the half-wave rectification of the output voltage of an isolation transformer through a diode;
the topological structure of the whole circuit design adopts the high-precision control of the MCU control unit and the high efficiency of the independent drive unit and the controllable rectifying unit, and particularly drives the circuit of the power module (IGBT) under the condition of not changing the whole topological structure of the inverter welding machine, so that the circuit can take the best of functions, and the problems of unstable arc striking or excessive small current caused by the fact that the timeliness of the output feedback of the whole topological structure and the control cannot keep up with the arc striking on the whole topological structure are avoided.
The controllable rectifying unit adopts a working mode of a rectifying bridge and an inductor L1, the inductor L1 ensures that the small current of arc striking is stable and excessive, the rectifying bridge can be used as a rectifying element and a switching element, the output is changed into simple time control, and the controllable rectifying unit is effectively connected with the MCU control unit, so that the welding unevenness caused by deflagration during arc striking is reduced, and particularly the welding for a small-diameter stud is reduced;
and through the accurate control of time control module in the MCU control unit, the drive output striking voltage is enough steady in short cycle time, compare in the direct contravariant output striking of conventional stud welding machine more accurate stable, be particularly suitable for the welding of minor diameter stud, sheet metal. Arc striking and welding of a conventional stud welding machine are realized by driving the IGBT module, driving voltage is converted in the middle, and the stud welding machine, particularly a small-diameter stud welding machine, is usually short in welding time, namely about the welding time of only 5-10ms, so that conversion between arc striking and welding is unstable. Through improvement, arc striking welding is completed in two parts, and ms-level stable transition can be achieved; the application range is wider, and the cost of a user is saved;
the MCU control unit adopts a PIC18F4620 singlechip and is responsible for receiving a switching signal and sending a signal to turn on the driving unit, the driving unit mainly comprises a control circuit consisting of a high-speed optocoupler TLP521 and a triode 9013, high-precision timing works simultaneously when the driving unit sends the signal, and the driving unit turns on the controllable rectifying unit under the action of the control power supply unit; the controllable rectifying unit consists of a rectifying bridge, a control transformer AC63V coil and an inductor L1, and the control power supply unit consists of a circuit consisting of a control transformer AC9V coil, a plurality of diodes, a plurality of electrolytic capacitors and the like;
the driving working principle is as follows: the control transformer AC9V coil is through diode D1, electric capacity C1, half-wave rectification and filtering compensation of electric capacity C2, produce driving voltage, when needing the striking, MCU the control unit signals for opto-coupler U1, four pins and three pins switch on this moment, four pin voltage are drawn low, triode Q2 switches on work this moment, driving voltage passes through triode Q2, resistance R6, resistance R7, diode D2, diode D3 reach controllable rectifier unit, controllable rectifier unit work produces direct current voltage this moment, and act on the positive negative pole of welding machine through inductance L1 reactance, produce striking voltage.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an contravariant stud welding machine welding current control system, includes switching signal, its characterized in that: the switching signal is electrically connected with an MCU (microprogrammed control unit), the MCU is electrically connected with a driving unit, the driving unit is electrically connected with a control power supply unit, the driving unit is electrically connected with a controllable rectifying unit, and the controllable rectifying unit is electrically connected with an implementation unit;
the drive unit is by the circuit that optical coupler U1, a plurality of diode and a plurality of triode are constituteed, control transformer AC9V coil among the control power supply unit forms half-wave rectification and filtering compensation through diode D1, electric capacity C1 and electric capacity C2, including rectifier bridge, control transformer AC63V coil and inductance L1 component in the controllable rectifier unit.
2. The welding current control system of the inverter stud welding machine according to claim 1, wherein: the MCU control unit comprises a time control module.
3. The welding current control system of the inverter stud welding machine according to claim 1, characterized in that: one side of a diode D1 in half-wave rectification and filtering compensation in the driving unit is electrically connected with an arrester F1, and the other end of the arrester F1 is electrically connected with one end of the AC9V coil of the control transformer.
4. The welding current control system of the inverter stud welding machine according to claim 2, characterized in that: the other end of the diode D1 is electrically connected with the capacitor C1 and the capacitor C2 which are connected in parallel, and the diode D1 is also electrically connected with the four pins of the optocoupler coupler U1 through a resistor R3 and a resistor R2 which are connected in series.
5. The welding current control system of the inverter stud welding machine according to claim 4, wherein: there is the 5V incoming end through resistance R1 electric connection on an opto-coupler U1's the pin, electric connection has triode Q1's collecting electrode on opto-coupler U1's two pins, triode Q1's base with MCU the control unit electric connection, triode Q1's projecting pole electric ground connection, opto-coupler U1's three pins with controllable rectifier unit electric connection, electric capacity C1 with electric capacity C2's the other end all with opto-coupler U1's three pins with rectifier bridge's interconnecting link electric connection.
6. The welding current control system of the inverter stud welding machine according to claim 5, wherein: optical coupler U1's three pins with electric connection has resistance R4 and resistance R5 on the connecting wire of rectifier bridge, resistance R4's other end electric connection has diode D3, resistance R5's other end electric connection has diode D2, diode D3 with diode D2 respectively with rectifier bridge electric connection, diode D3 with diode D2 respectively through resistance R9 and resistance R8 with optical coupler U1's three pins with rectifier bridge's interconnecting link electric connection.
7. The welding current control system of the inverter stud welding machine according to claim 6, wherein: the resistor R3 and the resistor R2 are electrically connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is electrically connected with the diode D1 and the resistor R3, the collecting electrode of the triode Q2 is electrically connected with the resistor R6 and the resistor R7 which are connected in parallel, and the resistor R6 and the resistor R7 are electrically connected with the resistor R5 and the resistor R4 respectively.
8. The welding current control system of the inverter stud welding machine according to claim 1, characterized in that: the control transformer AC63V coil is electrically connected with the rectifier bridge, two ends of the rectifier bridge are respectively electrically connected with the positive output end of the welding machine and the negative output end of the welding machine, and the inductor L1 is electrically connected between the negative output end of the welding machine and the rectifier bridge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222283625.6U CN218016309U (en) | 2022-08-30 | 2022-08-30 | Welding current control system of inverter stud welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222283625.6U CN218016309U (en) | 2022-08-30 | 2022-08-30 | Welding current control system of inverter stud welding machine |
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| CN218016309U true CN218016309U (en) | 2022-12-13 |
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| CN202222283625.6U Active CN218016309U (en) | 2022-08-30 | 2022-08-30 | Welding current control system of inverter stud welding machine |
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- 2022-08-30 CN CN202222283625.6U patent/CN218016309U/en active Active
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