CN107283027B

CN107283027B - Control system of gas shielded welding machine

Info

Publication number: CN107283027B
Application number: CN201710697759.3A
Authority: CN
Inventors: 石惟一; 鞠春盛; 石硕; 石蓓; 葛玲兰
Original assignee: Nanjing East Star Mechanical And Electrical Technology Co ltd
Current assignee: Nanjing East Star Mechanical And Electrical Technology Co ltd
Priority date: 2017-08-15
Filing date: 2017-08-15
Publication date: 2023-05-16
Anticipated expiration: 2037-08-15
Also published as: CN107283027A

Abstract

The invention discloses a control system of a gas shielded welding machine, which belongs to the field of control of electric welding machines and comprises a welding power supply and a wire feeder; the welding power supply comprises a welding machine main circuit, a main control board PCB1 and a driving board PCB2; a remote control box is added at the wire feeder, the remote control box comprises a wireless remote control transmitter YF and a functional module, and the functional module comprises an additional main control board PCB5, a power supply module S, a rectifying module PCB3, a current sensor H and a remote control box panel; the remote control box can be assembled with the wire feeder or can be placed separately; a wireless remote control receiver YS is added at the welding power supply, and the wireless remote control receiver YS can be assembled with the welding power supply or can be separately arranged. The invention can reduce or eliminate the control wires between the welding machine and the wire feeder, thereby saving the cost and reducing the failure rate of equipment.

Description

Control system of gas shielded welding machine

Technical Field

The invention belongs to the field of electric welding machine control, and particularly relates to a control system of a gas shielded welding machine, which can reduce or cancel control wires between a welding power supply and a wire feeder of the gas shielded welding machine.

Background

The gas shielded welder is a highly developed efficient and energy-saving welder in China. It does not use welding rod, and uses gas to protect during welding, so that it has no pollution, and is an energy-saving environment-protecting product. The gas shielded welder has 4 potentiometers with 4 adjustable analog quantities. The welding voltage, welding current, arc-collecting voltage and arc-collecting current are respectively used for the control board of the gas shielded welding machine by 4 analog quantities. Conventional gas shielded welders have 6 or more control wires between the welding power source and the wire feeder, about 10 to 30 meters in length, and up to 40 meters in length. It is common for welding engineers and welders that half of the failures of gas shielded welders occur on these six wires (torn, broken by the workpiece, burned out by the hot welded steel plate) and often produce collateral damage. For example, broken ends of wires collide together to cause short circuits, burn out electronic components on the control board, and even cause expensive power tube burst.

Disclosure of Invention

Aiming at the problems, after the working principle of the gas shielded welding machine and the product structure are carefully analyzed, two technical schemes 1 (adopting a wireless remote controller capable of sending analog quantity) and 2 (adopting a wireless remote controller capable of sending switching quantity) of the gas shielded welding machine capable of canceling control wires are proposed according to the difference of electromagnetic interference of construction sites under the inspired by the following various wireless remote control technologies; two gas shielded welding machines capable of reducing control wires are disclosed in the technical scheme 2, namely scheme 3 (2 wires) and scheme 4 (3 wires).

The technical scheme 1 of the invention is as follows: a control system of a gas shielded welding machine comprises a welding power supply and a wire feeder; the welding power supply comprises a welding machine main circuit, a main control board PCB1 and a driving board PCB2, wherein the main control board PCB1 is a gas shielded welding universal control board and is used for realizing arc-collecting voltage, welding voltage control and wire feeder control; the main circuit of the welding machine is respectively connected with the main control board PCB1 and the driving board PCB 2; a remote control box is added at the wire feeder, and comprises a wireless remote control transmitter YF and a functional module; the function module comprises an additional main control board PCB5, a power supply module S, a rectification module PCB3, a current sensor H and a remote control box panel; the welding machine main circuit is connected with a power supply module S, and the power supply module S is connected with a rectification module PCB 3; the rectification module PCB3 is connected with the additional main control board PCB5, and the additional main control board PCB5 is respectively connected with the current sensor H, the wire feeder and the wireless remote control transmitter YF; the additional main control board PCB5 has all or part of the functions of the main control board PCB1, and when the additional main control board PCB5 has all the functions of the main control board PCB1, the main control board PCB1 can be canceled; the remote control box can be assembled with the wire feeder or can be placed separately; a wireless remote control receiver YS is added on the welding power supply, and the wireless remote control receiver YS can be assembled with the welding power supply or can be separately arranged.

Further, in the main circuit of the welding machine, a three-phase power supply A, B, C is sequentially connected with a switch L1 and a rectifier bridge Z66 in series; the two ends of the rectifier bridge Z66 are sequentially connected with a capacitor 1C9, two ends of a switching tube K44 connected with a switch tube K55 in series, two ends of a switching tube K66 connected with a switch tube K77 in series and two ends of a capacitor 1C7 connected with a capacitor 1C8 in series; a second branch is led out between the switch tubes K44 and K55, and the second branch is sequentially connected with the current transformer, the capacitor 1C14, the inductor L3 and the primary side B11 of the first transformer in series; the other end of the second branch is respectively connected between the switching tubes K66 and K77 and between the capacitors 1C7 and 1C 8; the two end wires of the secondary side B12 of the first transformer are connected with the inductor L2, and the middle wire of the secondary side B12 of the first transformer is connected with the current sensor H; the three-phase power supply A, B, C is led out of one branch and is connected with the transformer TR1, and the secondary side of the transformer TR1 provides required power for the driving board PCB2 and the main control board PCB 1; the current transformer in the control main circuit is connected with the driving board PCB2, the driving board PCB2 is connected with the main control board PCB1, and the main control board is connected with the wire feeder.

Further, a wireless remote control module transmitter YF in the remote control box is a ZigBee wireless remote control transmitter and is formed by serially connecting a singlechip and an ultrahigh frequency transceiver; the wireless remote control receiver YS is a ZigBee wireless remote control receiver and is formed by serially connecting a singlechip, an ultrahigh frequency transceiver and a D/A converter.

Further, a wireless remote control transmitter YF and a wireless remote control receiver YS in the remote control box adopt a wireless remote control transmitter and a wireless remote control receiver of LoRa series.

Further, a welding power source "+" terminal is connected with a "+" input end of the power module S, a welding power source "-" terminal is connected with a "-" input end of the power module S, an inverter on the power module S is connected with a primary side of a second transformer, a group B1 output of the secondary side of the second transformer is connected with a group of alternating current input skewers O, P and Q of the PCB5, and a group B2 output of the secondary side of the second transformer in the power module S is connected with an input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5;

on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of a PCB5, a welding voltage potentiometer W3 and a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output line of a current sensor H and a welding voltage feedback line are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the additional main control board PCB5 has the same overall functions as the main control board PCB 1; the wireless remote control module transmitter YF is connected with the output end K of the PCB5, and the wireless remote control receiver YS is connected with the input end K of the PCB 2.

Further, a welding power source "+" terminal is connected with a "+" input end of the power module S, a welding power source "-" terminal is connected with a "-" input end of the power module S, an inverter on the power module S is connected with a primary side of a second transformer, a group B1 output of the secondary side of the second transformer is connected with a group of alternating current input skewers O, P and Q of the PCB5, and a group B2 output of the secondary side of the second transformer in the power module S is connected with an input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of the PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the connecting line A of the middle pin of the welding voltage potentiometer W3, the middle pin of the arc-receiving voltage potentiometer W1 and the wire feeder control boxes HN and SN is connected with the input port of the wireless remote control transmitter YF; the C end of the PCB1, the F end of the PCB1 and the A end of the PCB1 in the welding power supply are connected with the YS output port of the wireless remote control receiver.

Further, a wireless remote control module transmitter YF in the remote control box is a switch type wireless remote control transmitter and is formed by serially connecting a singlechip and an ultrahigh frequency transceiver; the wireless remote control receiver YS is a switch type wireless remote control receiver and is formed by serially connecting a singlechip, an ultrahigh frequency transceiver and a D/A converter.

Further, a welding power source "+" terminal is connected with a "+" input end of the power module S, a welding power source "-" terminal is connected with a "-" input end of the power module S, an inverter on the power module S is connected with a primary side of a second transformer, a group B1 output of the secondary side of the second transformer is connected with a group of alternating current input skewers O, P and Q of the PCB5, and a group B2 output of the secondary side of the second transformer in the power module S is connected with an input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of the PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the middle point of a welding voltage potentiometer W3, the middle pin of an arc-receiving voltage potentiometer W1 and a connecting line A of welding states HN and SN in a remote control of the wire feeder are connected with an input port of a wireless remote control transmitter YF; the C end of the PCB1, the F end of the PCB1 and the A end of the PCB1 in the welding power supply are connected with the YS output port of the wireless remote control receiver.

The technical scheme 2 of the invention is as follows: a control system of a gas shielded welding machine comprises a welding power supply and a wire feeder; the welding power supply comprises a welding machine main circuit, a main control board PCB1 and a driving board PCB2, wherein the main control board PCB1 is a gas shielded welding universal control board and is used for realizing arc-collecting voltage, welding voltage control and wire feeder control; the main circuit of the welding machine is respectively connected with the main control board PCB1 and the driving board PCB 2; a remote control box is added at the wire feeder, and the remote control box comprises a functional module; the function module comprises an additional main control board PCB5, a power supply module S, a rectification module PCB3, a current sensor H and a remote control box panel; the additional main control board PCB5 has all or part of the functions of the main control board PCB1, and when the additional main control board PCB5 has all the functions of the main control board PCB1, the main control board PCB1 can be canceled; the welding machine main circuit is connected with a power supply module S, and the power supply module S is connected with a rectification module PCB 3; the rectification module PCB3 is connected with the additional main control board PCB5, and the additional main control board PCB5 is respectively connected with the current sensor H and the wire feeder.

Further, a welding power source "+" terminal is connected with a "+" input end of the power module S, a welding power source "-" terminal is connected with a "-" input end of the power module S, an inverter on the power module S is connected with a primary side of a second transformer, a group B1 output of the secondary side of the second transformer is connected with a group of alternating current input skewers O, P and Q of the PCB5, and a group B2 output of the secondary side of the second transformer in the power module S is connected with an input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of a PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the additional main control board PCB5 has the same overall functions as the main control board PCB 1; the output end K of the PCB5 is connected with the input end K of the driving board PCB2, and when in welding, a welder presses a welding button on a welding gun to weld.

Further, a welding power source "+" terminal is connected with a "+" input end of the power module S, a welding power source "-" terminal is connected with a "-" input end of the power module S, an inverter on the power module S is connected with a primary side of a second transformer, a group B1 output of the secondary side of the second transformer is connected with a group of alternating current input skewers O, P and Q of the PCB5, and a group B2 output of the power module S is connected with an input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5;

on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of a PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the welding button HN in the control box, the intersection point A of the wire feeding button SN is connected with the input end A of the PCB1, the connecting wire of the middle pin of the welding voltage potentiometer W3 and the middle pin of the welding current potentiometer W4 is connected with the input end C of the PCB1, the point B of the PCB5 in the remote control box is connected with the point B of the PCB1 and is connected with GND, and the middle pin of the arc-receiving voltage potentiometer W1 is connected with the input end C of the PCB5 of the additional main control board; the actual adjustment of the knob of the welding current potentiometer W4 is the arc-receiving voltage; the arc-receiving voltage potentiometer W1 of the PCB5 is used for adjusting the soldering current.

The invention has the following beneficial effects:

the gas shielded welder has 6 or more control wires between the welding power source and the wire feeder, about 10 to 30 meters in length, and up to 40 meters in length. The invention can reduce or eliminate 6 or more control wires, not only for saving cost, but also greatly reducing the failure rate of equipment; on the other hand, the embodiment of the invention greatly enhances the electromagnetic interference resistance through the optimized configuration of the connection of the selected devices.

In addition, the control system of the gas shielded welding machine disclosed by the invention has the functions of wireless remote control of welding voltage and arc-receiving voltage, and can also be used in the welding process of an electrode for remotely controlling and adjusting welding current and arc force current; the method can also be used in an argon arc welding process for remotely adjusting welding current and reducing current; some welding processes, such as pulse welding, and also pulse frequency, duty cycle, etc., require adjustment of multiple welding parameters, and one of ordinary skill in the art would be able to add more remote control parameters to accommodate the need for adjustment of multiple welding parameters in accordance with the methods provided herein. The specific problems to be solved by the invention are as follows:

1) The wire diameter of 6 or more control wires is about 1mm, and when the wire feeder needs to be moved, a welder drags the control wire to move the wire feeder. The welding site is provided with a plurality of iron blocks with different sizes, the towed wire feeder is often clamped by the iron blocks of the body, and each wire cannot be as long, so that the shortest control wire is pulled to be broken.

2) The welding site is operated by a plurality of welders, and when the welders move the control wires, the control wires are often touched with welding seams which are just welded by the welders or just welded by others and are very hot, so that the control wires are burnt out.

3) The welding site often needs to use tools such as a large hammer to straighten or round the steel plate, or when cutting, the fallen steel blocks can be broken, the control wires are damaged by smashing, and when flame cutting, the fallen steel blocks can burn out the control wires.

4) Among the 6 or more control wires, three wires have a voltage of 24V (control motor and air valve) and three wires have a voltage of 15V or 5V (connection control circuit, single chip microcomputer, etc.). When the control wires are crushed or burnt out, the insulating layers of the wires are damaged, the wires are mutually shorted, the control board is burnt out, and the IGBT tube with high cost is damaged.

It is a common opinion for welding engineers and welders that more than half of the failures of gas shielded welders occur on these six wires and therefore have great practical value in production activities if these 6 or more control wires can be reduced or eliminated.

In addition, the welding machine has the beneficial effects that the welding voltage and the welding current adjusting knob of the current domestic or imported dynamic gas shielded welding machine are arranged on the wire feeder, but the arc-collecting voltage and the arc-collecting current adjusting knob are arranged on the welding power supply. Because if the arc-collecting voltage and arc-collecting current regulating knob is also placed on the wire feeder, 5 wires are added. Therefore, the welder needs to run to the welding power supply to adjust the arc-receiving voltage and the arc-receiving current, and can adjust the arc-receiving voltage and the arc-receiving current to be proper instead of the arc-receiving voltage and the arc-receiving current, so that the welder needs to run back and forth for several times. The invention can adjust 4 parameters of welding voltage, welding current, arc-collecting voltage and arc-collecting current, and can adjust more welding parameters by slightly changing the program of the singlechip.

Drawings

FIG. 1 is a wiring diagram of a commercially available gas shielded welder.

FIG. 1A, a control box panel view of a wire feeder.

FIG. 1B is a circuit diagram of a commercially available gas shielded welder.

Fig. 1C, a circuit diagram of a commercially available switch-type wireless remote control transmitter, receiver.

FIG. 1D, a circuit diagram of a commercially available manual arc welder.

Fig. 2,ZigBee 868,915MHz is a circuit diagram of a wireless remote control welder.

Fig. 2A,ZigBee 868,915MHz is a circuit diagram of a wireless remote welder transmitter YF 1.

Fig. 2B,ZigBee 868,915MHz is a circuit diagram of a receiver YS1 of a wireless remote control welder.

Fig. 2C,ZigBee 868,915MHz is a flowchart of the wireless remote welder transmitter YF1, YS 1.

Fig. 3, zigBee 2.4G wireless remote control welding machine circuit diagram.

Fig. 3a, zigbee 2.4g wireless remote control welder transmitter YF2 circuit diagram.

Fig. 3b, a circuit diagram of a receiver YS2 of the zigbee 2.4g wireless remote control welder.

Fig. 3c, a flowchart of the zigbee 2.4g wireless remote welder transmitter YF2, YS 2.

FIG. 4 is a circuit diagram of a switch type wireless remote control welder.

Fig. 4A, a circuit diagram of a transmitter YF3 of a switch-type wireless remote control welder.

Fig. 4B, a circuit diagram of a receiver YS3 of the switch type wireless remote control welder.

Fig. 4C, a flow chart of a transmitter YF3, YS3 receiver of a switch-mode wireless remote welder.

FIG. 5 is a circuit diagram of a two control wire remote welder.

FIG. 6 is a circuit diagram of a three control wire remote welder.

Fig. 7 is a circuit diagram of the power module S.

FIG. 8A is a schematic diagram of a welding power supply for a wireless remote control welder remote control cartridge.

FIG. 8B is a schematic diagram of a welding power supply for a remote control box of a wire-line remote control welder.

FIG. 9, loRa 433MHz wireless remote control welder circuit diagram.

Fig. 9a, lora 433mhz wireless remote welder transmitter YF2 circuit diagram.

Fig. 9b, a circuit diagram of a lora 433mhz wireless remote welder receiver YS 2.

The drawings show that the control boards of the gas shielded welding machines produced by the manufacturers have the same functions, the wiring diagrams are the same, but the names and the numbers of the skewers are different. The text is uniformly marked by English primary and secondary. The description is as follows

A, welding control signals of a button HN and a wire feeding button; y, GND ground wire (3 ground wire access points, are convenient to wire, one of which can be used); c, welding a connecting point of a current adjusting potentiometer W4 by a welding voltage adjusting potentiometer W3; d, empty feet; e, connecting a connecting point of the arc-receiving current adjusting potentiometer W2; f, connecting a connecting point of the arc-receiving voltage regulating potentiometer W1; g, an air valve and a voltage entry point; h, the voltage entering point of the air valve 0; i, wire feeder + voltage entry point; j, a 0 voltage entry point of the wire feeder; k, a PCB1 board or a PCB5 board control signal output point and a PCB2 board control signal input point; a current sensor + voltage entry point; m is a current sensor-voltage entry point; n is the output signal sending point of the current sensor; o, an alternating current control power supply 0V access point; p, an alternating current control power supply 18V access point; q is an alternating current control power supply 18V access point; r is an air valve access point; s, an air valve and a wire feeder access point; t is the access point of the wire feeder.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The working principle and circuit structure of the wiring diagram of the commercially available gas shielded welding machine are shown in fig. 1, wherein fig. 1A is a panel diagram of a wire feeder control box, and fig. 1B is a circuit diagram of the gas shielded welding machine.

As shown in fig. 1 and 1B, the welding machine power supply panel is provided with an adjusting knob for arc-collecting voltage W1, an adjusting knob for arc-collecting current W2, an adjusting knob for inductance W5, a voltmeter V and an ammeter I, a "+" - "terminal, a current sensor H, and a current sensor H connected to the" + "-" terminal.

In fig. 1B, the three-phase power source A, B, C is serially connected with a switch L1 and a rectifier bridge Z66 in sequence; the two ends of the rectifier bridge Z66 are sequentially connected with a capacitor 1C9, two ends of a switching tube K44 (which is an IGBT power electronic device in the application) connected with a K55 in series, two ends of the switching tube K66 connected with a K77 in series and two ends of the capacitors 1C7 and 1C8 connected in series; a second branch is led out between the switch tubes K44 and K55, and the second branch is sequentially connected with the current transformer, the capacitor 1C14, the inductor L3 and the primary side B11 of the first transformer in series; the other end of the second branch is respectively connected between the switching tubes K66 and K77 and between the capacitors 1C7 and 1C 8; the two end wires of the secondary side B12 of the first transformer are connected with the inductor L2, and the middle wire of the secondary side B12 of the first transformer is connected with the current sensor H; the three-phase power supply A, B, C is led out of one branch and is connected with the transformer TR1, and the secondary side of the transformer TR1 provides required power for the driving board PCB2 and the main control board PCB 1; the current transformer in the control main circuit is connected with the driving board PCB2, the driving board PCB2 is connected with the main control board PCB1, and the main control board is connected with the wire feeder.

In practice, there are various main circuits of welder (silicon controlled rectifier type, inverter type, full bridge, half bridge, forward, full bridge-hard switch, soft switch, etc.), and the present application can be matched with various main circuits and used.

As shown in fig. 1A, a control box is arranged on the wire feeder, a welding voltage potentiometer W3 adjusting knob, a welding current potentiometer W4 adjusting knob, a welding button HN (for controlling the start and stop of welding) and a wire feeding button SN (for controlling the start and stop of wire feeding without starting an inverter circuit) are arranged in the control box, the wire feeder is connected with a welding gun, the gun head of the welding gun is connected with a "+" terminal, and a workpiece is connected with a "-" terminal of a welding power supply. As shown in fig. 1B, the welding power supply is an inverter circuit, and the control circuit includes a main control board PCB1, a driving board PCB2 and a rectifying module PCB3, which are all installed in the welding power supply. The alternating current power supply can provide one or two groups of control power supplies for the control boards PCB1 and PCB2 and is connected with the input end of the rectification module PCB3, and the output end of the rectification module PCB3 provides power supplies required by the air valve and the wire feeder. Also shown in fig. 1B is a control circuit diagram of the wire feeder.

The welder knows that the gas shielded welder simply adjusts welding current by changing wire feeding speed, so that the welding current adjusting knob and the arc receiving current adjusting knob only adjust the wire feeding speed of the wire feeder and do not participate in an inverter circuit. The main control board PCB1 thus actually comprises two circuits, namely an inverter control circuit (directly related to the arc-receiving voltage given potentiometer W1 and the welding voltage given potentiometer W3) and a wire feeder control circuit (directly related to the arc-receiving current given potentiometer W2 and the welding current given potentiometer W4)

As shown in fig. 1B, the main control board PCB1 and the driving board PCB2 are powered by one winding of the power transformer, terminals G, H, I, J are connected to the skewer B2 of the rectifying module PCB3, terminals a, C are connected to the wire feeder, terminals E, F are connected to the arc-receiving voltage potentiometer W1 of the arc-receiving current potentiometer W2, terminals L, M, GND, N are connected to the current sensor signal output line H and the welding voltage feedback line, terminals X, Y are connected to the inductor potentiometer W5, and terminals K, GND are connected to the input terminal of the PCB 2.

Each gas shielded welder has the skewer with the functions described above, but the arrangement position and serial number are different.

The working principles of the current commercially available wireless remote controllers are similar, the wireless remote controllers can be divided into two major types, one type can transmit analog quantity, the other type can transmit switching quantity only, and one type is selected as an embodiment in the embodiment of the invention, and the two types are used as the embodiment in the prior art, and are described below. Of course, other wireless remote controllers may be used as an example. In the present invention, YF represents a wireless remote control transmitter, and YS represents a wireless remote control receiver. ZigBee is similar to bluetooth, WIFI, a standard that defines a range of short range, low transmission rates, protocols , operating at 868mhz,915mhz, and 2.4GHz. The transmission distance of zigBee is longer than the transmission distance of bluetooth, corresponds with WIFI, and is about 100 meters, and zigBee extensively is used in fields such as intelligent household electrical appliances.

YF1 and YS 1A wireless remote control transmitter YF1 and a wireless remote control receiver YS1 based on ZigBee are adopted in the invention. The device is a ZigBee 868,915MHz device, and consists of a singlechip STC12C5A60S2 and a ultra high frequency transceiver (UHF) CC 1100. The device can be used as a transmitter or a receiver. The maximum transmission rate is 500Kbps. YF2 and YS2 the invention adopts another wireless remote control transmitter YF2 and a wireless remote control receiver YS2 based on ZigBee. The device is a ZigBee 2.4GHz device, and consists of a U1-CC2530 singlechip and a high-power ultrahigh frequency transceiver U2-RFX 2401. The device may be used as a transmitter or as a receiver. The CC2530 has I/O ports for users. The maximum transmission rate is 250Kbps.

LoRa is another common wireless data transmission module, and the working frequency is 420-510MHz. The transmission distance of the device is far-slightly longer than that of the ZigBee 2.4GHz device, but the single chip microcomputer in the device is not provided with a port for users to use, and the users need to add the single chip microcomputer additionally.

The other "wireless remote control transmitter" and "wireless remote control receiver" adopted in the embodiment of the present invention are a commercially available switch type wireless remote control transmitter YF3 and wireless remote control receiver YS3 with a working frequency of 315 MHz. The remote control motor is used in the fields of remote control of starting and stopping of a motor, remote control of a desk lamp, switching and the like. Such a switching type "wireless remote control transmitter" and "wireless remote control receiver" cannot transmit analog quantity, but can transmit switching quantity, for example, cannot remotely control the brightness of the adjusting stage , but can remotely control the switching of the desk lamp.

There are various kinds of wireless remote control switches sold on the market, the circuit principle of which is not very different from that of the function, and the TAD6228 type is taken as an example, and the remote control has a transmitter and a receiver. Taking a desk lamp as an example, the related working principle is shown in fig. 1C. In the figure, the transmitter section AN1 is AN "on button", AN2 is AN "off button", and C1 is a control circuit of the transmitter. It has three control modes of "inching", "self-locking" and "interlocking". In "jog" mode, button AN2 is not required and only AN1 button is used. The A end of the AN1 is connected with the positive electrode of the 9V battery, the B end of the AN1 is connected with the circuit C of the transmitter, when the AN1 is pressed down, the A end and the B end of the AN1 are connected, the B end also has 9V voltage, the control circuit C1 is electrified, and the transmitter transmits electromagnetic waves. In the figure, the receiver part is C2, R, T, triode and J, respectively, is a control circuit of the receiver. When the receiver receives the electromagnetic wave sent by the transmitter, the control circuit C2 outputs a high level, T is conducted, J is absorbed, and the lamp is lighted. When the receiver does not receive the electric wave sent by the transmitter, the C2 outputs a low level, T is not conducted, J is disconnected, and the lamp is turned off.

Fig. 1D is a circuit diagram of a manual arc welder.

Example 1, example scheme 1:

As shown in fig. 1, the three-phase power source A, B, C is connected to a main circuit of a welding machine of the welding power source, a "+" terminal of the welding power source is connected with the wire feeder through a welding cable, a "-" terminal of the welding power source is connected with a welding workpiece through the welding cable, and a current sensor is sleeved on the welding cable; the welding power supply is also connected with the gas bottle through a heating cable, a gas pressure regulator and a gas bottle.

A control system of a gas shielded welding machine for reducing or canceling control wires consists of a welding power supply, a wire feeder and a remote control box, wherein the welding power supply is an NBC-500CO2 gas shielded welding machine, and the wire feeder is an SB-10-A-1 wire feeder. The circuit diagram is shown in fig. 2 and 8A.

The welding power supply NBC-500 consists of a main control board PCB1 and a driving board PCB2, wherein a circuit in the PCB1 is composed of a wire feeder control circuit and an inverter power supply control circuit, and the input end of the PCB2 is an endpoint K; the wire feeder comprises a control box, a welding voltage potentiometer W3, a welding current potentiometer W4, a welding button HN and a wire feeding button SN, wherein a remote control box is additionally arranged at the wire feeder, the remote control box comprises a wireless remote control transmitter module YF1, an additional main control board PCB5, a power supply module S, a rectifying module PCB3, a current feedback module H and a remote control box panel, the remote control box panel is provided with an arc-collecting voltage W1 adjusting knob, an arc-collecting current W2 adjusting knob, an inductance W5 adjusting knob, a voltmeter V ammeter I, a "+" - "terminal and a current feedback module H which are arranged on a connecting line of the" + "-" terminal; the remote control box can be assembled with the wire feeder or can be placed separately; a wireless remote control receiver module YS1 is added to the welding power supply.

The core elements of YF1 and YS1 are a wireless remote control transmitter YF1 and a wireless remote control receiver YS1 using ZigBee based as described in the prior art of the present invention. The device is a ZigBee 868,915MHz device, and consists of a singlechip STC12C5A60S2 and a ultra high frequency transceiver (UHF) CC 1100. The device can be used as a transmitter or a receiver. The maximum transmission rate is 500Kbps. The wireless remote control transmitter YF1 in the remote control box is formed by serially connecting a singlechip U1-STC12C5A60S2 and an ultrahigh frequency transceiver (UHF) U2-CC 1100. The wireless remote control receiver YS1 at the welding power supply is formed by serially connecting an ultrahigh frequency transceiver (UHF) U3-CC1100, a singlechip U4-STC12C5A60S2 and a D/A converter U5-TLC 7226. The connection relation is as follows:

the welding power source "+" terminal is connected with the wire feeder through a welding cable, the welding power source "-" terminal is connected with a welding workpiece through a welding cable, and the current sensor is sleeved on the welding cable.

The welding power source "+" terminal is connected with the "+" input end of the power source module S, the welding power source "-" terminal is connected with the "-" input end of the power source module S, the B1 group output of the power source module S is connected with a group of alternating current input skewers O, P and Q of the PCB5, and the B2 group output of the power source module S is connected with the input end of the rectification module PCB 3. The output of the rectification module PCB3 is connected with G, H, I and J of the PCB5, a welding button HN and a connecting line A of a wire feeding button SN in a control box of the wire feeding machine are respectively connected with A and C of the PCB5, the middle pin of the arc-receiving voltage potentiometer W1 and the middle pin of the arc-receiving current potentiometer W2 are respectively connected with the welding voltage potentiometer W3 and the connecting line A of the wire feeding button SN, the connecting line of the inductance potentiometer W5 is connected with F, E, X and Y of the PCB5, the output line of the current sensor and the welding voltage feedback line are connected with L, M, GND and N of the PCB5, and K and GND are the output ends of the PCB 5.

The additional main control board PCB5 has the same function as the PCB 1.

Fig. 2A is an electrical schematic of a transmitter. The output end K of the PCB5 is connected with the P1.0 port of the singlechip U1-STC12C5A60S2 in the wireless remote control transmitter YF1, and the data of the output end K of the PCB5 and the welding machine code are sent out by the U2-RF 1100. Fig. 2B is an electrical schematic of the receiver. After receiving the electromagnetic wave sent by YF1, the YS1 receiver amplifies the electromagnetic wave through U3-RF1100, the single-chip microcomputer U4-STC12C5A60S2 recognizes the welding machine code, after confirming the welding machine code as the local machine, the single-chip microcomputer U4 sends the data to the D/A converter U5-TLC7226, after D/A conversion, the OUTA pin sends the input end K of the analog quantity PCB2, and the figure 2C is a flow chart of the transmitting and receiving part. When welding, a welder presses a welding button on a welding gun, the transmitter YF1 of the wireless remote controller transmits data of the output end K of the PCB5 and a welding machine code through an antenna, after receiving electromagnetic waves sent by the transmitter YF1 of the wireless remote controller, the receiver YS1 of the wireless remote controller at a welding machine power supply is firstly decoded, if the electromagnetic waves are selected, the received pulse signals are converted through D/A, and then welding voltage signals are transmitted to the input end K of the PCB2 for welding.

Example 2, example scheme 1:

a control system of a gas shielded welding machine for reducing or canceling control wires consists of a welding power supply, a wire feeder and a remote control box, and is the same as in the embodiment 1, except that the welding power supply is an NBC-350CO2 gas shielded welding machine, and the wire feeder is a CS-301 wire feeder. YF and YS are YF2 and YS2, and are a wireless remote control transmitter YF2 and a wireless remote control receiver YS2 based on ZigBee in the prior art. The device is a ZigBee 2.4GHz device, and consists of a U1-CC2530 singlechip and a high-power ultrahigh frequency transceiver U2-RFX 2401. The device may be used as a transmitter or as a receiver. The CC2530 has I/O ports for users. The maximum transmission rate is 250Kbps.

The wireless remote control transmitter YF2 in the remote control box is formed by serially connecting a singlechip U1-CC2530 and a ultrahigh frequency transceiver (UHF) U2-RFX 2401. The wireless remote control receiver YS2 at the welding power supply is formed by serially connecting an ultrahigh frequency transceiver (UHF) U3-RFX2401, a singlechip U4-CC2530 and a D/A converter U5-TLC 7226. The circuit diagram is shown in fig. 3 and 8A. The additional main control board PCB5 is the same as the control circuit part of the wire feeder of the main control board PCB 1. The connection relation is as follows:

the middle pin of the welding voltage potentiometer W3 is connected to the P0.0 port of the wireless remote control transmitter YF2-CC2530, the middle pin of the arc-receiving voltage potentiometer W1 is connected to the P0.1 port of the wireless remote control transmitter YF2-CC2530, and the connection line A of the wire feeder control box HN and SN is connected with the P0.2 port of the singlechip in YF 2. The C terminal of PCB1 in the welding power supply is connected to OUTA of U2-TLC7226 of YS2, the F terminal of PCB1 in the welding power supply is connected to OUTB of U2-TLC7226 of YS2, the A terminal of PCB1 in the welding power supply is connected to OUTC of U2-TLC7226 of YS2, and FIG. 3C is a flow chart of the transmitting and receiving part. When welding, a welder presses a welding button on a welding gun, a transmitter YF2 of the wireless remote controller transmits 3 pulse signals of a welding voltage value, an arc-receiving voltage value and a state control value and a selector code through an antenna, after receiving electromagnetic waves sent by the transmitter YF2 of the wireless remote controller, a receiver YS2 of the wireless remote controller at a welding power supply is firstly decoded, if the electromagnetic waves are selected, the received pulse signals are transformed through D/A, the welding voltage signals are sent to a PCB1C end, the arc-receiving voltage signals are sent to an F-stop of the PCB1, and the welding state control signals are sent to an A end of the PCB1 for welding.

Example 3, example 2:

a control system of a gas shielded welding machine for reducing or canceling control wires consists of a welding power supply, a wire feeder and a remote control box, and is the same as in the embodiment 1, except that the welding power supply is an NBC-250CO2 gas shielded welding machine, and the wire feeder is a CS-423 type wire feeder. As shown in fig. 4, 8A. YF and YS are YF3 and YS3, and are the switch type wireless remote control transmitter module disclosed by the invention in the prior art.

The switch type wireless remote control transmitter YF3 in the remote control box is formed by serially connecting a singlechip U1-STC12C5412AD and a high-power ultrahigh frequency transmitter U2-TAD-6228. The switch type wireless remote control receiver at the welding power supply consists of a high-power ultrahigh frequency receiver U3-TAD-6228, a singlechip U4-STC12C5412AD and a 4D/A converter U5-TLC7226 which are connected in series. The additional main control board PCB5 is the same as the control circuit part of the wire feeder of the main control board PCB 1. The purchased switch-type wireless remote control transmitter YF3 is subjected to the following processing. See fig. 1C, which cuts off the wiring of the AN2 of the transmitter to other circuits. As shown in fig. 4, the switching type wireless remote control receiver module YS3, YS3 at the welding power supply is a switching type wireless remote control receiver. Referring to fig. 1C, the relay in the switch-type wireless remote control receiver YF3 module is not used. The connection relation is as follows:

FIG. 4A is an electrical schematic of a TAD-6228 transmitter. The midpoint of a welding voltage potentiometer W3 in the remote control of the wire feeder is connected with the P1.0 port of a singlechip U1 in YF3, the middle pin of the arc-receiving voltage potentiometer W1 is connected to the P1.1 port of the singlechip U1 in YF3, and a connecting wire A of welding states HN and SN is connected with the P1.2 port of the singlechip in YF 3. The C terminal of PCB1 in the welding power supply is connected with OUTA of U5-TLC7226 in YS3, and the F terminal of PCB1 in the welding power supply is connected with OUTB of U5-TLC7226 in YS 3. The A terminal of the solder PCB1 in the solder power is connected to the OUTC of U5-TLC7226 in YS 3. The working principle is as follows:

see fig. 4A. In the wire feeding box, the welding voltage V3 at the midpoint of the welding voltage potentiometer W3 is connected to the P1.0 port of the single chip microcomputer U1 in the YF3, the arc-receiving voltage V1 of the 3 pin of A5 of the PCB-1 is connected to the P1.1 port of the single chip microcomputer U1 in the YF3, and the voltage V5 value of the connecting wire A of HN and SN in the wire feeding box is connected to the P1.2 port of the single chip microcomputer U1 in the YF 3.

In fig. 4A, the single-chip microcomputer U1 calculates the time T1 according to the V3 value, calculates the time T2 according to the V1 value, calculates the time T3 according to the V5 value, outputs three pulses with widths of T1, T2 and T3 to the B site of the button AN1, and when the three pulses arrive, the B end of the on button of the TAD-6228 transmitter is at a high level, the transmitter of the TAD-6228 transmits 3 electromagnetic waves P1, P2 and P3 with widths of T1, T2 and T3.

Fig. 4B is an electrical schematic diagram of the switching type wireless remote control receiver YS 3. After receiving electromagnetic waves P1, P2 and P3 with widths of T1, T2 and T3, a U3-TAD-6228 receiver in the receiver YS3 sends pulses P1, P2 and P3 to a U4-P1.0 port of a single chip by a control panel C2 of the TAD-6228 receiver, U4 decodes the pulses first, if the pulses are selected, the U4 reduces the T1 value and the T2 value to voltages V3 and V1 and V5, data is sent to pins D0 to D7 of U5-TLC7226 by P2.0 to P2.7 of the U4, after D/A conversion, the V3 value is sent to a C end (welding voltage value) of PCB1 by an OUTA pin of U5-TLC7226, and the V1 value is sent to a F end (arc receiving voltage value) by an OUTB pin of TLC 7226. The V5 value is sent from the OUTC port of TLC7226 to terminal a (weld status voltage value). When the OUTC pin sends 4.7V to the A3-6 pin of the PCB1, the welding power supply is in an idle state, when the OUTB pin sends 3.0V to the A3-6 pin of the PCB1, the welding power supply is in a wire-feeding state, and when the OUTB pin sends 1.3V to the A3-6 pin of the PCB1, the welding power supply is in a welding state.

Fig. 4C is a flow chart of the transmit and receive portions. When welding, a welder presses a welding button on a welding gun, a transmitter YF3 of a wireless remote controller transmits three pulse signals with pulse width proportional to a welding voltage value, an arc receiving voltage value and a welding state and a selector code through an antenna, after receiving electromagnetic waves sent by the transmitter YF3 of the wireless remote controller, a receiver YS3 of the wireless remote controller at a welding power supply is decoded first, if the electromagnetic waves are selected, the received pulse signals are converted through D/A, the welding voltage signals are sent to a C end of a PCB1, the arc receiving voltage signals are sent to an F end of the PCB1, and the welding state control signals are sent to an A end of the PCB1 for welding.

Example 4, example scheme 3:

a control system of a gas shielded welding machine for reducing or canceling control wires consists of a welding power supply, a wire feeder and a remote control box, as shown in fig. 5 and 8B, and is the same as in embodiment 1, except that the welding power supply is an NBC-250CO2 gas shielded welding machine, and the wire feeder is a CS-423 type wire feeder. As shown in fig. 5. Wherein, the function of additional main control board PCB5 is the same with main control board PCB1, and the output K of PCB5 links to each other with the input K of PCB2 at welding power department, and during the welding, the welder presses the welding button on the welder, alright weld.

Example 5, example scheme 4:

a control system of a gas shielded welding machine for reducing or canceling control wires consists of a welding power supply, a wire feeder and a remote control box, as shown in fig. 6 and 8B, and is the same as in the embodiment 1, except that the welding power supply is an NBC-250CO2 gas shielded welding machine, and the wire feeder is a CS-423 type wire feeder. As shown in fig. 6. Wherein the additional main control board PCB5 is the same as the wire feeder control circuit part PCB1-1 of the main control board PCB 1.

The welding button HN in the remote control box, the intersection point A of the wire feeding button SN is connected with the input end A of the PCB1, the middle pin of the welding voltage potentiometer W3, the connecting wire of the middle pin of the welding current potentiometer W4 is connected with the input end C of the PCB1, the point B of the PCB5 in the remote control box is connected with the point B of the welding power supply and is connected with GND, and the middle pin of the arc-receiving voltage potentiometer in the remote control box is connected with the input end C of the PCB5 of the additional main control board. Thus, the arc-receiving voltage is actually regulated by the knob of the welding current potentiometer W4 in the control box of the wire feeder; the arc-receiving voltage potentiometer W1 of the PCB5 is used for adjusting the soldering current.

During welding, a welder presses a welding button on a welding gun to start welding, rotates a welding voltage potentiometer W3 knob on the wire feeding box, adjusts welding voltage, rotates a welding current potentiometer W4 knob on the wire feeding box, adjusts arc-receiving voltage, and rotates an arc-receiving voltage knob W1 on a control box panel to serve as a welding current adjusting device.

Example 6, example scheme 1:

the same as in example 2, except that the ZigBee2.4GHz module in example 2 was replaced with E32-TTL-100 of the LoRa series. See fig. 9, 9A, 9B.

Among the components described in the embodiments herein, the driving board PCB2 and the welder main circuit employ a soft switching inversion technique of shandong voltage, inc. The technology has obtained the national technological progress and has been widely adopted by the manufacturers of electric welding machines in China. The additional main control board PCB5 and the main control board PCB1 are all air-shielded welding universal control boards, and an NB28D type control board is adopted in the embodiment of the invention. The circuit in the control board is composed of a wire feeder control circuit and an inverter power supply control circuit.

The current sensor commonly used is a Hall current sensor or a shunt. When the welding power supply is arranged on the connecting line of the terminal of the welding power supply, the L end and the M end of the PCB5 board are connected with the output end of the Hall current sensor or the shunt, the GND end of the PCB5 board is connected with the terminal of the welding power supply, a welding voltage signal is led out from the connecting line of the terminal of the welding power supply, and the welding voltage signal is connected to the N end of the PCB5 board; when a hall current sensor or shunt. When the welding power source is arranged on the connecting line of the "+" terminal of the welding power source, the L end and the M end of the PCB5 board are connected with the output end of the Hall current sensor or the shunt, the GND end of the PCB5 board is connected with the "+" terminal, a welding voltage signal is led out from the connecting line of the "-" terminal, and the welding voltage signal is connected to the N end of the PCB5 board after being reversed.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control system of a gas shielded welding machine comprises a welding power supply and a wire feeder; the welding power supply comprises a welding machine main circuit, a main control board PCB1 and a driving board PCB2, wherein the main control board PCB1 is a gas shielded welding universal control board and is used for realizing arc-collecting voltage, welding voltage control and wire feeder control; the main circuit of the welding machine is respectively connected with the main control board PCB1 and the driving board PCB 2; the wire feeder is characterized in that a remote control box is added at the wire feeder, and the remote control box comprises a wireless remote control transmitter YF and a functional module; the function module comprises an additional main control board PCB5, a power supply module S, a rectification module PCB3, a current sensor H and a remote control box panel; the welding machine main circuit is connected with a power supply module S, and the power supply module S is connected with a rectification module PCB 3; the rectification module PCB3 is connected with the additional main control board PCB5, and the additional main control board PCB5 is respectively connected with the current sensor H, the wire feeder and the wireless remote control transmitter YF; the additional main control board PCB5 has all or part of the functions of the main control board PCB1, and when the additional main control board PCB5 has all the functions of the main control board PCB1, the main control board PCB1 can be canceled; the remote control box can be assembled with the wire feeder or can be placed separately; a wireless remote control receiver YS is added on the welding power supply, and the wireless remote control receiver YS can be assembled with the welding power supply or can be separately arranged; the wireless remote control module transmitter YF in the remote control box is a ZigBee wireless remote control transmitter and is formed by serially connecting a singlechip and an ultrahigh frequency transceiver; the wireless remote control receiver YS is a ZigBee wireless remote control receiver and is formed by serially connecting a singlechip, an ultrahigh frequency transceiver and a D/A converter; a wireless remote control transmitter YF and a wireless remote control receiver YS at a welding power supply in the remote control box adopt a wireless remote control transmitter and a wireless remote control receiver of LoRa series; the welding power source "+" terminal is connected with the "+" input end of the power source module S, the welding power source "-" terminal is connected with the "-" input end of the power source module S, the inverter on the power source module S is connected with the primary side of the second transformer, the output of the secondary side B1 of the second transformer is connected with one group of alternating current input skewers O, P and Q of the PCB5, and the output of the B2 group of the secondary side of the second transformer in the power source module S is connected with the input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of a PCB5, a welding voltage potentiometer W3 and a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output line of a current sensor H and a welding voltage feedback line are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the additional main control board PCB5 has the same overall functions as the main control board PCB 1; the wireless remote control module transmitter YF is connected with the output end K of the PCB5, and the wireless remote control receiver YS is connected with the input end K of the PCB 2; the welding power source "+" terminal is connected with the "+" input end of the power source module S, the welding power source "-" terminal is connected with the "-" input end of the power source module S, the inverter on the power source module S is connected with the primary side of the second transformer, the output of the secondary side B1 of the second transformer is connected with one group of alternating current input skewers O, P and Q of the PCB5, and the output of the B2 group of the secondary side of the second transformer in the power source module S is connected with the input end of the rectification module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of the PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the connecting wire A of the middle pin of the welding voltage potentiometer W3, the middle pin of the arc-receiving voltage potentiometer W1 and the wire feeder control boxes HN and SN is connected with the input port of the wireless remote control transmitter YF; the C end of the PCB1, the F end of the PCB1 and the A end of the PCB1 in the welding power supply are connected with the YS output port of the wireless remote control receiver.

2. The control system of a gas shielded welding machine according to claim 1, wherein in the main circuit of the welding machine, a three-phase power source A, B, C is connected in series with a switch L1 and a rectifier bridge Z66 in sequence; the two ends of the rectifier bridge Z66 are sequentially connected with a capacitor 1C9, two ends of a switching tube K44 connected with a switch tube K55 in series, two ends of a switching tube K66 connected with a switch tube K77 in series and two ends of a capacitor 1C7 connected with a capacitor 1C8 in series; a second branch is led out between the switch tubes K44 and K55, and the second branch is sequentially connected with the current transformer, the capacitor 1C14, the inductor L3 and the primary side B11 of the first transformer in series; the other end of the second branch is respectively connected between the switching tubes K66 and K77 and between the capacitors 1C7 and 1C 8; the two end wires of the secondary side B12 of the first transformer are connected with the inductor L2, and the middle wire of the secondary side B12 of the first transformer is connected with the current sensor H; the three-phase power supply A, B, C is led out of one branch and is connected with the transformer TR1, and the secondary side of the transformer TR1 provides required power for the driving board PCB2 and the main control board PCB 1; the current transformer in the control main circuit is connected with the driving board PCB2, the driving board PCB2 is connected with the main control board PCB1, and the main control board is connected with the wire feeder.

3. The control system of a gas shielded welding machine according to claim 1, wherein the wireless remote control module transmitter YF in the remote control box is a switch type wireless remote control transmitter, and is composed of a singlechip and an ultrahigh frequency transceiver connected in series; the wireless remote control receiver YS is a switch type wireless remote control receiver and is formed by serially connecting a singlechip, an ultrahigh frequency transceiver and a D/A converter.

4. A control system of a gas shielded welding machine according to claim 3, wherein the welding power "+" terminal is connected to the "+" input of the power module S, the welding power "-" terminal is connected to the "-" input of the power module S, the inverter on the power module S is connected to the primary side of the second transformer, the output of the secondary side B1 of the second transformer is connected to a set of ac input pins O, P, Q of the PCB5, and the output of the secondary side B2 of the second transformer in the power module S is connected to the input of the rectifying module PCB 3; the output of the rectifying module PCB3 is connected with G, H, I and J ports of the PCB 5; on the wire feeder, a welding button HN and a wire feeding button SN in a control box of the wire feeder are connected with an A port of a PCB5, a welding voltage potentiometer W3 and a connecting wire of a welding current potentiometer W4 on a wire feeding box panel of the wire feeder are connected with a C port of the PCB5, a middle pin of an arc-receiving voltage potentiometer W1, a middle pin of an arc-receiving current potentiometer W2 and a connecting wire of an inductance potentiometer W5 of the control box of the wire feeder are respectively connected with F, E, X and Y of the PCB5, an output wire of a current sensor H and a welding voltage feedback wire are connected with a L, M, GND, N end of the PCB5, wherein K and GND are output ends of the PCB 5; the middle point of a welding voltage potentiometer W3, the middle pin of an arc-receiving voltage potentiometer W1 and a connecting line A of welding states HN and SN in a remote control of the wire feeder are connected with an input port of a wireless remote control transmitter YF; the C end of the PCB1, the F end of the PCB1 and the A end of the PCB1 in the welding power supply are connected with the YS output port of the wireless remote control receiver.