Search

CN-121972766-A - Split type precision welding expansion device based on common direct current electric welding machine

CN121972766ACN 121972766 ACN121972766 ACN 121972766ACN-121972766-A

Abstract

The invention discloses a split type precision welding expansion device based on a common direct current electric welding machine, which relates to the technical field of electric welding and comprises a 12V isolated voltage-stabilized power supply module, an IGBT power regulating circuit, a high-frequency arc striking circuit, an air supply control module, a reverse connection alarm module and other protection control modules. The device is connected with a common direct current welding machine in a serial connection mode, does not need an external additional power supply, does not influence the normal electric welding function of the original welding machine, and can be expanded after serial connection to realize the functions of precise welding and surfacing. The 12V isolated regulated power supply module supplies power to each circuit module, the IGBT power regulating circuit is responsible for regulating welding power and current, and the high-frequency arc striking circuit is linked with the power regulating circuit to provide high-frequency high-voltage arc striking, so that the device is low in cost and complete in function.

Inventors

  • LIU GUOSHENG
  • LIU YANG

Assignees

  • 安徽经天金属表面处理科技有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (9)

  1. 1. The split type precise welding expansion device based on the common direct current electric welding machine is characterized by comprising a 12V isolated voltage-stabilized power supply module, an IGBT power regulating circuit, a high-frequency arc striking circuit, an air supply control module, a reverse connection alarm module, an overvoltage protection module and an input protection circuit; The expansion device is connected with the common direct current electric welding machine in series, no other power supply is needed, the electric welding function can be normally realized when the common direct current electric welding machine is not connected with the expansion device in series, and the precision welding and surfacing functions are expanded after the common direct current electric welding machine is connected with the expansion device in series; The input end of the 12V isolated voltage-stabilized power supply module is connected with the output end of the common direct current welder, and the output end supplies power for other circuit modules to realize dynamic voltage conversion and stable output; the IGBT power regulating circuit is connected with the output end of the 12V isolated regulated power supply module and is used for controlling welding power and current regulation; The high-frequency arc striking circuit is linked with the IGBT power adjusting circuit and provides high-frequency high-voltage arc striking; The air supply control module, the reverse connection alarm module, the overpressure protection module and the input protection circuit are respectively matched with the core circuit to realize welding protection and safety control.
  2. 2. The split type precision welding expansion device based on the common direct current electric welding machine is characterized in that the 12V isolation stabilized voltage power supply module adopts a DC-DC isolation type step-up and step-down module, the input voltage range is 12-90V, the output voltage is stabilized to be 12V, the output current is 4A, and a stabilized voltage threshold is set, wherein no output is generated when the input voltage is lower than 9V, and the stable output is 12V when the input voltage is higher than 12V.
  3. 3. The split type precision welding expansion device based on the common direct current electric welding machine is characterized in that the IGBT power adjusting circuit comprises 4 parallel high-power IGBTs, a piezoresistor, a transient suppression diode, a 10 omega resistor and a 47K resistor, wherein the IGBTs are driven by an isolation type on-off module with negative pressure, and a grid electrode and 2 anti-series 5W18V voltage stabilizing diodes form a protection circuit through the transient suppression diode.
  4. 4. The split type precise welding expansion device based on the common direct current electric welding machine is characterized in that the high-frequency arc striking circuit comprises a high-frequency arc striking plate and a high-frequency coupling coil, the welding machine outputs 50-90V voltage when in no-load, the high-frequency plate outputs high-frequency high-voltage arc striking of over 2000V, the arc striking duration is 2-2.5 seconds, and the high-voltage output is stopped when the arc voltage (load voltage) is lower than 45V after the arc striking is successful.
  5. 5. The split type precise welding expansion device based on the common direct current electric welding machine is characterized in that the air supply control module comprises a power supply delay conduction unit and a power failure delay closing unit, when the external switch is connected, the external switch triggers the air supply in advance, and after the welding is disconnected, the air supply is delayed to be closed, so that molten pool protection is realized.
  6. 6. The split type precision welding expansion device based on the common direct current electric welding machine according to claim 1, wherein the reverse connection alarm module comprises a fast recovery diode rectifier bridge and a voltage reduction alarm unit, when an input power supply of the expansion device is connected reversely, the rectifier bridge blocks power supply, and meanwhile the alarm unit sends out continuous alarm sounds.
  7. 7. The split type precision welding expansion device based on the common direct current electric welding machine is characterized in that the overvoltage protection module comprises 4-5 serially connected 5W voltage stabilizing diodes, resistors, 12V/20A micro relays and an alarm, when the input voltage exceeds a set value, the voltage stabilizing diodes break down to trigger the relays to attract and disconnect a power supply, and the alarm is started.
  8. 8. The split type precision welding expansion device based on the common direct current electric welding machine according to claim 1, wherein the input protection circuit comprises a fast recovery diode rectifier bridge, a high-voltage capacitor, a transient suppression diode and more than 4 Schottky diodes, wherein the high-voltage capacitor, the transient suppression diode and the more than 4 Schottky diodes are connected in parallel with the 10uF and are used for absorbing high-voltage spikes and reverse electromotive force.
  9. 9. The split type precision welding expansion device based on the common direct current electric welding machine is characterized by being capable of realizing the functions of high-frequency arc striking welding electrode electric welding, high-frequency arc striking argon arc welding, pulse-free welding, pulse welding and argon arc cold welding.

Description

Split type precision welding expansion device based on common direct current electric welding machine Technical Field The invention relates to the technical field of electric welding, in particular to a split type precise welding expansion device based on a common direct current electric welding machine. Background The conventional direct current electric welding machine is mainly of an independent integrated machine structure, even if a high-grade multifunctional electric welding machine is provided, the existing electric welding machine has no external control switch and high-frequency arc striking welding electrode welding function, the welding electrode welding only supports the single function of scratch arc striking electric welding, and the requirements of the scenes such as stainless steel welding, aluminum alloy welding, precise part repairing and the like on precise welding processes such as argon arc welding, argon arc cold welding and the like in modern industrial production are difficult to adapt. Meanwhile, the scratch arcing mode has obvious operation defects that when welding is performed at narrow positions such as the inside of equipment and gaps of parts, an electrode needs to be rubbed and ignited with a workpiece, surrounding parts are easy to touch by mistake to cause ignition, the workpiece or the equipment is damaged, a power supply cannot be cut off rapidly when the arc is broken, spark can still be generated due to the fact that the welding rod leaves the welded workpiece, and potential safety hazards exist. In addition, if multiple functions such as electric welding, argon arc welding and cold welding are required to be realized, multiple special high-grade welding machines of different types are required to be purchased independently, the cost of a single device is high, the device input pressure of middle and small enterprises and maintenance shops is greatly increased, the prior art lacks a solution scheme capable of expanding the precise welding function with low cost on the basis of keeping the original functions of the common electric welding machine, and the function requirement and cost control are difficult to balance. Disclosure of Invention The invention aims to overcome the defects of the conventional welding machine, and provides a split type precision welding expansion device based on a common direct current welding machine, which can be used with the common direct current welding machine to realize various precision control welding or overlaying welding functions, solve the problems of mislighting and the like of welding at a narrow position, reduce equipment cost and realize multiple purposes. The split type precision welding expansion device based on the common direct current electric welding machine is characterized by comprising a 12V isolated voltage-stabilized power supply module, an IGBT power regulating circuit, a high-frequency arc striking circuit, an air supply control module, a reverse connection alarm module, an overpressure protection module and an input protection circuit; The expansion device is connected with the common direct current electric welding machine in series, no other power supply is needed, the electric welding function can be normally realized when the common direct current electric welding machine is not connected with the expansion device in series, and the precision welding and surfacing functions are expanded after the common direct current electric welding machine is connected with the expansion device in series; The input end of the 12V isolated voltage-stabilized power supply module is connected with the output end of the common direct current welder, and the output end supplies power for other circuit modules to realize dynamic voltage conversion and stable output; the IGBT power regulating circuit is connected with the output end of the 12V isolated regulated power supply module and is used for controlling welding power and current regulation; The high-frequency arc striking circuit is linked with the IGBT power adjusting circuit and provides high-frequency high-voltage arc striking; The air supply control module, the reverse connection alarm module, the overpressure protection module and the input protection circuit are respectively matched with the core circuit to realize welding protection and safety control. Preferably, the 12V isolated regulated power supply module adopts a DC-DC isolated buck-boost module, the input voltage range is 12-90V, the output voltage is stabilized to be 12V, the output current is 4A, and a regulated threshold is set, wherein no output is generated when the input voltage is lower than 9V, and the stable output is generated when the input voltage is higher than 12V. The IGBT power regulating circuit comprises 4 parallel high-power IGBTs, piezoresistors, transient suppression diodes, 10 omega resistors and 47K resistors, wherein the IGBTs are driven by an isolated type negative-pressure on-off modul