CN201881035U

CN201881035U - Wire feeding control circuit and circuit board structure of tapped gas shielded welding machine

Info

Publication number: CN201881035U
Application number: CN201020663862XU
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: 2010-12-16
Filing date: 2010-12-16
Publication date: 2011-06-29
Anticipated expiration: 2020-12-16

Abstract

A wire feeding control circuit and circuit board structure of a tapped gas shielded welding machine comprises a circuit board and a control circuit mounted on the circuit board. The control circuit is capable of being connected with various main circuits and controlling speed of a wire feeding motor or capacity of welding current. The control circuit can control the speed of the wire feeding motor by a power transistor and the circuit, and control an input of a welding transformer by means of a relay so as to control current on and off. The power transistor is served as a controlling member, and accordingly the control circuit is simple and low in cost.

Description

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

Technical field

The utility model relates to the single phase poaer supply power voltage supply tappedly has gas or a gas-protection-free welding machine, specifically is a kind of structure of wire-feeding control circuit and circuit board of tapped gas shielded welding machine.

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 have gas or the gas shielded welding machine of general single phase poaer supply power voltage supply mainly contain two types, and the one, adopt traditional tapped welding transformer, reactor, realize its function in conjunction with electronically controlled wire feeding circuit again; The 2nd, adopt complete electronically controlled inverter welding power source, reactor, realize its function in conjunction with electronically controlled wire feeding circuit again, owing to 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 certainly; 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 carry out semi-automatic welding.

The entire circuit of contravariant welding machine and structure thereof are complicated more a lot of than tapped welding machine, the latter be the simplest, also be the welding machine of maintenance easily.Content of the present utility model does not relate to the scope of inverter type welder, but has the field of gas or gas shielded welding machine relevant with tapped; Have gas or the gas shielded welding machine tapped, 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 circuit, and the stability of output current and voltage depends on the stability of power supply and wire feed rate.

For a long time, because the cost of welder with taps is low, structure and circuit are simple, so the export volume of class welding machine or the sales volume in market are occupied very great share, be advanced technology the contravariant welding machine can't compare, the kind of tapped semi-automatic arc welder is many, and their version also is varied, and the form of welding transformer is simple relatively.To wire-feeding control circuit, different producers may be inequality, different circuit and structural design thinking thereof, the physical circuit form that is adopted also is different with the mode that entire circuit is arranged, moreover, the performance of welding machine mainly is that the stability, cost of welding process also can be because of welding transformer and wire feeding circuit different have some evident difference, and these factors particularly cost, the price of product all can produce very large influence to the competitiveness of product in market.

Summary of the invention

The purpose of this utility model is to provide a kind of structure of wire-feeding control circuit and circuit board of tapped gas shielded welding machine, and the control device of employing is a triode, and it is the current-mode control device, and control circuit is simple, and cost is also lower.

For achieving the above object by the following technical solutions:

A kind of wire-feeding control circuit of tapped gas shielded welding machine and the structure of circuit board; 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: adopt the speed of pliotron and circuit thereof control wire feeding motor, adopt relay to control the input through and off circuit of welding transformer.

The components and parts of arranging on the described control circuit board comprise relay CR1 and CR2, control transformer TR2, protective tube FUSE1 and FUSE2, single-phase rectification bridge D2, triode Q1, diode D1, electrochemical capacitor C2 and C3, capacitor C 1 and resistance R 1～R5, potentiometer RP1 and WR1.

The device that the utility model adopts is a triode, and it is the current-mode control device, and control circuit is comparatively simple, and cost is also lower, and this has just strengthened the competitiveness of product in market, and this is one of advantage that adopts sort circuit.

For the main circuit part; no matter the welding transformer that adopted is elementary or secondary windings is classification tap how; as long as the form of circuit is identical; its work principle also is similar; the mode that all belongs to single phase ac output or secondary commutation output; because this part is general circuit and operation principle thereof, so the scope of the utility model application rights and interests protection does not relate to the main circuit part, and only wire-feeding control circuit and specific boards structure Design thereof are protected in application.

Description of drawings:

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

Fig. 2 is circuit theory diagrams of the present utility model;

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

Fig. 4 is wire feeding circuit board component arrangement figure of the present utility model.

The specific embodiment

Shown in Fig. 1-4, power switch S1-1 and S1-2, electric fan FM, output and weldingvoltage change-over switch S2, tapped welding transformer TR1 are arranged, wire feeding motor and wire feeder M thereof, welding gun and switch TS thereof, are installed in the temperature relay TH(closed type on the welding transformer), wire-feeding control circuit etc.; The version of transformer can be varied, still, as long as wire feeding circuit and connection type thereof are the same, then do not influence content of the present utility model and protection right thereof, also needs high-power single-phase rectification bridge D and filter reactor L1 when adopting direct current output.

After connecting power supply, the power switch S1 of the welding machine that closes, then electric fan FM work.Behind the regulation stall S2 that chooses output voltage, whether the energising of welding transformer waits depends on then whether arc welding gun switch TS closes.That is to say, can the elementary winding of welding transformer connect power supply, depend between CN3 and the CN4 plug whether be communicated with, and CN3, the break-make of CN4 is by the decision of the state of the relay K on the wire feed control panel 1 or CR1 and control circuit thereof, when closed arc welding gun switch TS, relay K 1 or CR1, K2 or CR2 action, make between CN3 and the CN4 plug and be communicated with, welding transformer work can produce output AC voltage and electric current, for the welding machine that exchanges output, the voltage and current of welding transformer output is exactly the operating voltage and the electric current of welding, for DC welder, this voltage then will just can become VD and electric current through after the rectifier D rectification; On the other hand, the action of K2 or CR2, its normally closed interlock can disconnect the resistance R 5 on the wire feeding circuit plate, and meanwhile, triode Q1 produces output under the effect of its control circuit, 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 can make welding wire send to according to certain speed behind decelerator, 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, and welding wire and base metals melt, cool off, solidify, and finally form weld seam; When disconnecting arc welding gun switch TS, relay K 1 or CR1 are failure to actuate, disconnect between CN3 and the CN4 plug, so welding transformer is not worked, also just can not export weldingvoltage and electric current, simultaneously, relay K 2 or CR2 on the wire feed control panel also are failure to actuate, can make the armature circuit of the resistance R 5 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 WR1 changes, can make the output state of triode Q1 change, 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 WR1, 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 or disconnect, 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.

In the past, in this type of welding machine, the wire-feeding control circuit that has is to adopt IGCT and corresponding circuit thereof or adopt FET and pwm pulse width adjusting control circuit thereof to realize electric machine speed regulation.IGCT is a kind of phase control-type device, after it is opened, need to wait for that the regular hour could turn-off, and therefore, it is long to regulate the response time of controlling, and makes the inside of wire feeding motor the phenomenon of sparking, the service life of reduction motor occur easily; 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; FET is a kind of voltage-controlled device, and its speed of opening or turn-offing is very fast, and the wire feed control performance is better, still, its control circuit relative complex, cost is also higher relatively.

The device that the utility model adopts is a triode, and it is the current-mode control device, and control circuit is comparatively simple, and cost is also lower, and this has just strengthened the competitiveness of product in market, and this also is one of advantage that adopts sort circuit.

Wire-feeding control circuit for this type of welding machine of other manufacturer, each used relay, triode are if adopt the components and parts of other model, although or adopt identical device model, and the serigraphy identifier on the circuit board is with of the present utility model different, or the size of circuit board, device arrangements mode difference, but as long as circuit theory is identical with structure, the essence of its circuit is with of the present utility model consistent, the category that belongs to same circuit, the behavior that all should be considered as invading the utility model right.

Claims

1. the structure of the wire-feeding control circuit of a tapped gas shielded welding machine and circuit board; 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: adopt the speed of pliotron and circuit thereof control wire feeding motor, adopt relay to control the input through and off circuit of welding transformer.

2. the structure of the wire-feeding control circuit of a kind of tapped gas shielded welding machine as claimed in claim 1 and circuit board; it is characterized in that: the components and parts of arranging on the described control circuit board comprise relay CR1 and CR2, control transformer TR2, protective tube FUSE1 and FUSE2, single-phase rectification bridge D2, triode Q1, diode D1, electrochemical capacitor C2 and C3, capacitor C 1 and resistance R 1～R5, potentiometer RP1 and WR1.