CN201900363U

CN201900363U - Structure of wire feeding control circuit of tapped gas shielded welding machine

Info

Publication number: CN201900363U
Application number: CN2010206201656U
Authority: CN
Inventors: 朱宣东; 朱宣辉; 陈法庆
Original assignee: Zhejiang Kende Mechanical and Electrical CO Ltd
Current assignee: Zhejiang Kende Mechanical and Electrical CO Ltd
Priority date: 2010-11-23
Filing date: 2010-11-23
Publication date: 2011-07-20
Anticipated expiration: 2020-11-23

Abstract

The utility model relates to a structure of a wire feeding control circuit of a tapped gas shielded welding machine, which comprises a circuit board and a control circuit mounted on the circuit board, wherein the control circuit can be connected with multifarious main circuits and controls the speed or the intensity of the welding current of a wire feed motor. The structure of the wire feeding control circuit of the tapped gas shielded welding machine is characterized in that the feeding wire control circuit comprises a rectifier module, a control module and a peripheral circuit; the rectifier module comprises relay K1 and relay K2, a control transformer T1, a filter electrolytic capacitor C1 and a single-phase rectifying bridge D1; the control module comprises a PWM (Pulse-Width Modulation) integrated circuit U1, a field-effect tube Q1, triode Q2 and triode Q3, voltage stabilizing tube Z1 and voltage stabilizing tube Z2, and diodes D5-D7; and the peripheral circuit mainly comprises a potentiometer P5 and a resistor R9. The advantage of the utility model lies in favorable circuit and structural design thereof, which are important guarantee of stable wire feeding speed, wide range regulating of the wire feeding speed, low production cost, high reliability and advanced technique of the tapped gas shielded welding machine.

Description

A kind of structure of wire-feeding control circuit of tapped gas shielded welding machine

Technical field

The utility model relates to the tapped gas shielded welding machine product of single phase poaer supply power voltage supply, specifically is a kind of structure of wire-feeding control circuit of the PWM of employing technology.

Background technology

Current, the competition of electric welding machine produce market is very fierce, not only is embodied on the advance and advantage of technology, also depends on the aspects such as efficient of consistency of product and functional reliability and production to a great extent.

At present, the gas shielded welding machine of general single phase poaer supply power voltage supply mainly contains two types, and the one, adopt traditional tapped welding transformer, reactor, realize its function in conjunction with electronically controlled wire-feeding control circuit again; The 2nd, adopt complete electronically controlled inverter welding power source, reactor; realize its function in conjunction with electronically controlled wire-feeding control circuit again; certainly; because the form difference of the two class sources of welding current; its form such as circuit of forming wire feed control is also different fully; no matter be which kind of welding machine, both can adopt gas shield to weld, also can adopt the FLUX flux-cored wire that need not gas shield to weld.

The entire circuit of contravariant welding machine and structure thereof are complicated more a lot of than tapped welding machine; the latter is the simplest; it also is the gas shielded welding machine that keeps in repair easily; content of the present utility model does not relate to the scope of inverter type welder; but it is relevant with the field of tapped gas shielded welding machine; concerning tapped gas shielded welding machine; the number of secondary turns of common this welding machine welding transformer is constant; only by changing output or the weldingvoltage that its primary turns changes welding machine; the adjusting of welding current or control are then finished by wire-feeding control circuit, and the stability of output voltage depends on the stability of power supply and wire feed rate.

Summary of the invention

Continuously, regulate equably, like this, the stability of wire feed rate also is reasonable to the armature voltage that wire-feeding control circuit of the present utility model can make wire feeding motor between 3 to 30V.The acquisition of these advantages is owing to adopt FET and it is carried out PWM(pulse width modulation) control, with obtain to stablize, the result of wide region wire feed rate, this technology is a kind of advanced technology of current wire feeding motor control, is representing the direction of technical development.

A kind of structure of wire-feeding control circuit of tapped gas shielded welding machine; comprise circuit board and be installed in control circuit on the circuit board; this control circuit can be connected with the main circuit of various ways; and the speed of wire feeding motor or the size of welding current controlled; it is characterized in that: described wire-feeding control circuit comprises rectification module; control module and peripheral circuit; described rectification module comprises relay K 1 and K2; control transformer T1; electrolytic capacitor filter C1 and single-phase rectification bridge D1; control module comprises PWM integrated circuit U1; FET Q1; triode Q2 and Q3; voltage-stabiliser tube Z1 and Z2; diode D5～D7, peripheral circuit mainly comprise potentiometer P5; resistance R 9.

The FET that the utility model adopts is to belong to the voltage-type control element, the input resistance of this device is very high, antijamming capability is strong, secondly, the influence that its output state can the controlled terminal electric current change, but only be subjected to the width of driving pulse or the control of dutycycle size, moreover, because the pulse-width modulator and the advanced control technology thereof that adopt high accuracy to regulate are so the width of driving pulse or dutycycle size are very stable.The armature voltage that the utility model can make wire feeding motor between 3 to 30VDC continuously, regulate equably, only this point is just good than the circuit performance that other above-mentioned two kinds of components and parts are formed, secondly, because the armature voltage of motor is limited in 30V, can eliminate the phenomenon that produces spark discharge between the carbon brush of motor internal and the rotor greatly so adopt this novel wire feed control mode, prolong the service life of carbon brush, this also is one of advantage that adopts this new-type circuit.

Description of drawings:

Fig. 1 is a schematic block circuit diagram of the present utility model;

Fig. 2 is a wire feeding circuit schematic diagram of the present utility model;

Fig. 3 is wire feeding circuit board component arrangement figure of the present utility model.

The specific embodiment

As Figure 1-3; a kind of structure of wire-feeding control circuit of tapped gas shielded welding machine; comprise circuit board and be installed in control circuit on the circuit board; this control circuit can be connected with the main circuit of various ways; and the speed of wire feeding motor or the size of welding current controlled; described wire-feeding control circuit comprises rectification module; control module and peripheral circuit; described rectification module comprises relay K 1 and K2; control transformer T1; electrolytic capacitor filter C1 and single-phase rectification bridge D1; control module comprises PWM integrated circuit U1; FET Q1; triode Q2 and Q3; voltage-stabiliser tube Z1 and Z2; diode D5～D7, peripheral circuit mainly comprise potentiometer P5; resistance R 9.

Whether after the welding machine energising, can the elementary winding of welding transformer connect power supply, depend between CN3 and the CN4 plug to be communicated with, and the break-make of CN3, CN4 is by the state decision of relay K on the wire feed control panel 1 and control circuit thereof.When closed arc welding gun switch TS, relay K 1, the K2 action, make between CN3 and the CN4 plug and be communicated with, welding transformer work, can produce output AC voltage, after this voltage process rectifier D rectification, become VD, on the other hand, the action of K2, can disconnect the resistance R 9 on the wire feeding circuit plate, meanwhile, the work of PWM integrated circuit U1 and peripheral circuit thereof can produce the pulsed drive FET Q1 break-make of certain dutycycle, and at the certain voltage of the armature two ends of wire feeding motor acquisition, under the effect of this voltage, the wire feeding motor entry into service, welding wire is sent to according to certain speed, can form welding arc at welding gun and by between the workpiece that welds, produce certain welding current and voltage, effect and welding gun at arc heat move down, welding wire and base metals fusing, cooling, solidify, finally form weld seam, when disconnecting arc welding gun switch TS, relay K 1 is failure to actuate, disconnect between CN3 and the CN4 plug,, also just can not produce output welding DC voltage so welding transformer is not worked, simultaneously, relay K 2 on the wire feed control panel also is failure to actuate, and can make the armature circuit of the resistance R 9 access wire feeding motors on the wire feeding circuit plate, can play the quick dynamic braking of motor, prevent that welding wire is bonded at the purpose on the weld seam when welding finishes.

When welding current regulator potentiometer P5 changes, effect by U1 and peripheral circuit thereof, pulse width or dutycycle that U1 is produced change, and like this, the pulse that drives FET Q1 break-make also changes, the armature voltage of wire feeding motor is changed, this has just changed the wire feed rate or the welding current of welding wire, and wire feed rate is fast more when regulating P5, and then welding current is big more, otherwise then welding current reduces.

When superheating phenomenon appearred in the long-time welding of welding transformer, temperature relay TH can move, at this moment, under the control action of circuit, welding wire stops to send to, and welding process also just can not be proceeded, descend up to temperature, just can proceed welding after temperature relay TH recovers.

If the output voltage of transformer and wire feed rate are stable, then welding process also is stable, this has just created good condition for obtaining good appearance of weld and quality, if wire feed rate instability, then welding process will become unstable, also just can not obtain high quality weld, if the velocity variations scope of wire feed is narrower, then the excursion of Dui Ying welding current is also just little, the range of application of welding machine also can be subjected to some restrictions, as seen, the stability of wire feed rate and excursion are determining the quality of welder performance to a great extent.

Past, the wire-feeding control circuit of this type of welding machine adopts triode or IGCT and corresponding circuit thereof to realize that triode is the current-mode control device, and the state of its output is base current and the factor affecting such as multiplication factor that is subjected to it, the variation of these parameters, the capital influences the variation of wire feed rate, therefore is difficult to accomplish to control result's uniformity, and IGCT is a kind of phase control-type device, after it is opened, need the wait regular hour to turn-off, therefore, the response time of regulating control is long; Secondly, cause false triggering during the little angle of flow easily.These all can cause the poor stability and the narrow problem of adjustable range of wire feed rate; In addition, this type of welding machine also has a degenerative problem of output voltage, the variation that is wire feed rate also can be subjected to the welding machine output voltage influence, when the welding machine output voltage is higher, the voltage at wire feeding motor armature two ends can be up to more than 40 volts, and is even higher, well beyond the operating voltage of motor, this just makes the inside of wire feeding motor the phenomenon of sparking, the service life of reducing motor occur easily.

Circuit that the utility model is good and structural design thereof are advantage of the present utility model places, also are that to satisfy tapped gas shielded welding machine wire feed rate stable, and the wire feed rate adjustable range is wide, the important leverage of low-cost production, high reliability, technical advance.

Claims

1. the structure of the wire-feeding control circuit of a tapped gas shielded welding machine; comprise circuit board and be installed in control circuit on the circuit board; this control circuit can be connected with the main circuit of various ways; and the speed of wire feeding motor or the size of welding current controlled; described wire-feeding control circuit comprises rectification module; control module and peripheral circuit; described rectification module comprises relay K 1 and K2; control transformer T1; electrolytic capacitor filter C1 and single-phase rectification bridge D1, control module comprises PWM integrated circuit U1; FET Q1; triode Q2 and Q3; voltage-stabiliser tube Z1 and Z2; diode D5～D7.

2. the structure of the wire-feeding control circuit of a kind of tapped gas shielded welding machine as claimed in claim 1, it is characterized in that: described peripheral circuit mainly comprises potentiometer P5, resistance R 9.