CN2244979Y

CN2244979Y - Generating arc controller for ac and dc electric welder

Info

Publication number: CN2244979Y
Application number: CN 96211958
Authority: CN
Inventors: 高建文
Original assignee: HUDONG SHIPYARD
Current assignee: HUDONG SHIPYARD
Priority date: 1996-05-22
Filing date: 1996-05-22
Publication date: 1997-01-15
Anticipated expiration: 2006-05-22

Abstract

The utility model provides a generating arc controller for ac and dc electric welders, which is controlled by high-frequency sine wave; the requirement for a contact resistance of a welded welder is low, and the sensitivity for controlling the generating arc is high. The utility model is composed of a regulated power supply, a high-frequency signal generator and an identify circuit; the output end for a high-frequency signal of the high-frequency signal generator and the input end of the identify circuit are connected in parallel with an output bus of an electric welder. When the generating arc is controlled, a main power supply of the electric welder can be switched on, and the main power supply can right away automatically close in 0.8-1 second after an operator stops the welding work; the no-load consumption of the electric welder can be reduced; the electric shock hazard for the operator caused by no-load voltage can be avoided.

Description

A kind of AC-DC welder arc strike control device

The utility model belongs to arc welding or electric arc cutting field.

The standard GB15579-95.IEC 974/1:1989. of People's Republic of China (PRC) arc welding equipment safety requirements first: the source of welding current the 1st chapter. the 1st joint the 1st trifle has the regulation of using rated voltage in the bigger environment of Danger Electric shock risk.The regulation of State Standard of the People's Republic of China GB10235-88 arc welding transformer anti-electric shock apparatus " subject content and the scope of application ", at the little environment of Danger Electric shock risk, AC value 80V, peak value 113V, the alternating current-direct current arc electric welding machine of the specified secondary floating voltage that direct current peak value 113V is above need be adorned anti-electric shock apparatus.The direct current-direct current (AC-DC) welding of the specified secondary floating voltage more than the big environment AC value 48V peak value 68V direct current peak value 113V of Danger Electric shock risk needs the dress anti-electric shock apparatus.

The electric welding machine about secondary side output AC effective voltage 80V is used in the outfield operation in a large number, to personnel component threat, the electric welding machine that the typical case uses has: the BX3-500F of Nanjing Electric Welding Machine Factory, the BXL3-500F of electric welder factory, Linhai, state-run 5032 YFBX1-500-1 of factory of boats and ships parent company, Hu Nan electric welder factory ZXE1-6-500/400 type.Wherein: BX3-500F, XL3-500F, YFBX-500-1 type ac arc wedling machine all are equipped with anti-electric shock apparatus, owing to there is the striking difficulty, the shortcoming of poor reliability can not real work.For example the BX3-500F of Nanjing Electric Welding Machine Factory welding machine exchanges anti-electric shock apparatus sensitivity≤3 ohm and can not adapt to the outfield operation and use, and reason is its contact resistance that can not overcome platform and workpiece.BXL3-500F welding machine in electric welder factory, Linhai is equipped with the interchange anti-electric shock apparatus, and at the secondary side of its electric welding main transformer A.C. contactor is housed, and makes soldering turret and secondary side be in released state before the welding machine striking, to reach the purpose that obtains high resistant sensitivity.The operator obviously feels striking or to repeat striking slow, makes troubles for actual the use.If misoperation takes place, promptly closes the secondary side A.C. contactor in conditions at the arc and will cause damage.Present similar Hu Nan electric welder factory ZXE-6-500/400 type, the one-piece type welding machine of AC/DC widely use socially, and direct current is to obtain by the single-phase full wave rectification, does not have a kind of device that AC-dc welding machine is carried out simultaneously electrocution-proof protection at present.

It is a kind of low to the contact resistance requirement that the purpose of this utility model is to provide, and the higher high-frequency signal controlled arc striking device for AC-DC welder (hereinafter to be referred as control device) of arcing initiation success rate, be applicable to all kinds of AC welding sets, DC welder, alternating current-direct current two welding machines, make the operator break away from the Danger Electric shock risk that unloaded output voltage causes, guarantee personal safety, and minimizing wastes, energy savings.

The utility model comprises that casing and operating circuit constitute:

Fig. 1 is the control device casing, the usefulness that has 6 binding posts to be connected with welder power for control device on the connecting box 1.Structural design has shock resistance, and volume is little, and it is convenient to change, and binding post 1#, 2# connect and exchange the 50HZ36V power supply, and 3#, 4# connect electric welding machine output bus-bar, and 5# connects pile crown under the K1 (the last pile crown of K1 connects the AC380V power supply), 6# connects the CJ/40A ac contactor coil.

Operating circuit is by HF signal generator 2, identifier 3, and voltage-stabilized power supply 4 constitutes.Fig. 2 is the control device functional-block diagram, and T3 provides and exchanges 36 volts of voltages, and for HF signal generator, identifier is used through stabilized voltage supply device output DC24V, 12V voltage.

Connect control device terminals 3#, 4# pile crown after 10～20KHZ sinewave output end of HF signal generator and the parallel connection of identifier input.Be connected on the electric welding machine output bus-bar.When connecting the 380V electrical source of power, enter the striking state for the treatment of, on welding machine output bus-bar, there is a voltage that changes 20～400,000 times " peak value " each second, for identifier identification, the operator has the striking action, and high frequency voltage on the bus-bar " peak value " disappears.As long as identifier recognizes once the disappearance of " peak value ", once required the fact of striking with regard to the memory operation person, the execution structure of identifier drives the CJ10/40A A.C. contactor, connects the primary side power supply of electric welding machine main transformer, makes secondary side output AC or the direct-flow no load voltage usefulness for striking.Striking success back identifier has not the fact greater than 0.8 second～floating voltage output more than 1 second with inquiry, if exist, the executing agency of identifier will close main transformer primary side power supply.If recover welding job less than 0.8～1 second, identifier will be negated a timing program in the past, come back to " inquiry " floating voltage whether to occur 0.8 second～state more than 1 second.

The utility model can effectively be distinguished the striking state for the treatment of, conditions at the arc, unloaded output state, and to high_frequency sine wave voltage, power frequency sine wave voltage, the voltage that direct-current polarity can be replaced arbitrarily, discern, and can control the welding machine output voltage effectively, make it in striking, connect electric welding machine main transformer primary side power supply, the operator is after stopping welding job after 0.8～1 second time, close electric welding machine main transformer primary side power supply, so not only make electric welding machine under off position, close the welder transformer power supply, make the operator break away from the Danger Electric shock risk that unloaded output voltage causes, guarantee personal safety, and minimizing wastes, energy savings.

The utility model has overcome low-resistance sensitivity and has exchanged anti-electric shock apparatus uses the striking difficulty that produces in the outfield shortcoming, overcome for obtaining high resistant and installed striking and the slow shortcoming of repetition striking control that magnetic switch brings additional at welding machine main transformer secondary side, a kind of have high resistant sensitivity, high_frequency sine wave quick identification are provided, are applicable to all kinds of direct current-direct current (AC-DC) weldings and the soldering turret positive-negative polarity selects arbitrarily to guarantee the high_frequency sine wave control AC-DC welder striking of personal safety under butt welding machine direct current output state device.

Because the utility model is reliable, with low cost, can be widely used in the AC transformer welding machine, controllable silicon DC welder, silicon rectifier welder, AC-dc welding machine and carbon planer.

Description of drawings:

Fig. 1 is the casing figure of control device;

Fig. 2 is the control device functional-block diagram;

Fig. 3 is control device way circuit figure;

Fig. 4 is a control device HM1 circuit diagram;

Fig. 5 is a control device HM2 circuit diagram;

Below in conjunction with Fig. 3, Fig. 4, Fig. 5 the utility model embodiment is described:

Control device way circuit figure is by shown in Figure 3, and T1 is the electric welding machine main transformer, and L1, L2 are line voltage mark marks, are connected to the 380V power distributing cabinet, and K1 is welding machine work/closing control switch.The CJ10/40A A.C. contactor is a welding machine main transformer primary side power switch, and ZL is a single-phase rectifier, and LB-smoothing reactor, DK are the alternating current-direct current output selector switch, and 3#, 4# wiring point are the control device binding posts, is connected on the welding machine output line bus-bar.

T3 is an auxiliary transformer; single-phase 380V/36V; 50VA is the AC power of control device, the fusing fuse that F is control device, as control device power component " short circuit " protection with, C6, C7, C8, C9, C10, NF form noise filter, DL1 is that rectifier, pulsating direct current are exported two groups of voltages of 24V, 12V through mu balanced circuit.

Be the high_frequency sine wave generator in the frame of broken lines I among Fig. 3, form by HM1, C4, VR1, LED1, DZ1, C5, R3, Q4, Q3, R2, R1, C2T2, C1.Sine wave generating circuit in the HM1 thick film circuit (1 district among Fig. 4) is by capacitor C 1, C2, C3, C4, resistance R 1, R2, R3, R4, R5, R6, IC 1 is formed, capacitor C 1, resistance R 2, the termination 12V positive pole of R5,

capacitor C

1,3 pin of another termination IC 1 of resistance R 1, resistance R 1, R2 capacitor C 2, the end of C3 connects together,

capacitor C

4,1 of the termination IC 1 of C2,2,5 pin, 7 pin of capacitor C 3 and resistance R 3 series connection ICs 1, resistance R 4 is attempted by IC 1 and 6, on 7 pin, 6 pin of another termination IC 1 of resistance R 5, capacitor C 4 and resistance R 6 series connection are by the other end sine wave output voltage of R6.4 pin ground connection of IC 1,8 pin connect the DC24V positive pole.

High_frequency sine wave drive circuit in the HM1 thick film circuit (2 districts among Fig. 4) is by resistance R 7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, capacitor C 5, C6, diode D1, D2, D3, D4, LED, IC 2, transistor Q1 forms.

Resistance R 7 is connected to 3 pin of positive 12V and IC 2, resistance R 8 is connected in parallel on 1 pin and 2 pin of

IC

2,1 pin of resistance R 11 1 termination ICs 2, another termination transistor Q1 base stage, the positive 24V of resistance R 12 1 terminations, another termination transistor Q1 colelctor electrode, transistor Q1 grounded emitter, by resistance R 13 to D points output 10～20KHZ high_frequency sine wave driving voltage, by diode D1, D2 resistance R 15 ground connection, and connect R14 to E point at the negative electrode of diode D2, output 10～20KHZ high_frequency sine wave driving voltage, 2 pin of IC 2 connect the G point by R10, the H point meets positive 12V, I point connecting resistance R9, the other end ground connection of R9.Resistance R 16 1 termination F points, the positive pole of another termination electrolytic capacitor C5, the negative pole of electrolytic capacitor C5 connects diode D3 negative electrode, D4 anode, diode D3 plus earth, D4 negative electrode connecting resistance R17, R18 tie point, the tie point of the positive pole of resistance R 17 ground connection, R18 connecting resistance R19 and electrolytic capacitor C6, resistance R 19 connect the J point.Separate the minus earth of capacitor C 6.A point-positive 24V dc source, the positive 12V dc source of B point, C point-earth point.

Identifier HM2 thick film circuit C3, J1, D3, J2, D2, DL2, Q1, J3, D1 form.Identification circuit in the HM2 thick film circuit, treat that arc ignition circuit, arc ignition circuit (1 district among Fig. 5) are by voltage-stabiliser tube DZ1, DZ2, photoelectrical coupler PC1, resistance R 0, R1, R2, R3, R4, R5, R6, R7, transistor Q1, controllable silicon SCR 1, SCR2, diode D1, D2 forms.

Voltage-stabiliser tube DZ1 negative electrode connects the A point, anode connecting resistance R0,1 pin of another termination photoelectrical coupler PC1 of R0,2 pin of PC1 connect the B point, 5 pin meet positive 12V, the tie point of 4 pin connecting resistance R1, R2, R6, R2 other end ground connection, another termination transistor of R1 Q1 base stage, the anode of R6 other end connecting resistance R7, diode D2, R7 other end ground connection, the negative electrode of D2 connects the control utmost point of controllable silicon SCR 2, the minus earth of SCR2, anode connect the E point.The tie point of transistor Q1 colelctor electrode connecting resistance R3, R4, another termination 12V of R3, the tie point of the other end connecting resistance R5 of R4 and voltage-stabiliser tube DZ2 negative electrode, the other end ground connection of R5, the anode of DZ2 connects the control utmost point of controllable silicon SCR 1, the minus earth of SCR1, and the negative electrode of SCR1 connects the D point.

Alternating current-direct current identification conversion in the HM2 thick film circuit, direct-current polarity identification, floating voltage identification, timer output circuit (2 districts among Fig. 5) is by rectifier bridge D1, voltage-stabiliser tube DZ3, DZ4, photoelectrical coupler PC2, IC 1, diode D3, D4, transistor Q2, resistance R 8, R9, R10, R11, R12, R13, R14, R15, R16, R17 form.

Rectifier bridge D1 ac input end connects the B point respectively, the C point, anodal output and voltage-stabiliser tube DZ3, DZ4, resistance R 8 is in series and connects 1 pin of photoelectrical coupler PC2, negative pole output connects 2 pin of PC2, the 4 pin ground connection of PC2,3 pin of 5 pin connecting resistance R9 and IC 1, another termination 12V of resistance R 9,2 pin connecting resistance R10 of IC 1, R11, the 4 pin ground connection of IC1,8 pin meet positive 24V, 1 pin connecting resistance R12 and diode D3 anode, another termination of R10 12V, R11 other end ground connection, the positive 24V of another termination of R12, the D3 negative electrode connects the base stage of crystal Q2, the Q2 grounded emitter, Q2 colelctor electrode connecting resistance R13, R14, the positive 24V of another termination of R13,5 pin of another termination IC 1 of R14 and J point.6 pin connecting resistance R15, the R16 of IC1,7 pin connecting resistance R17, diode D4 anode, the positive 12V of another termination of R15, R16 other end ground connection, the positive 24V of another termination of R17, D4 negative electrode connect the H point and carry out output command.The G point-+the 24V power supply, the F point-+the 12V power supply, I point-ground connection.

Among Fig. 3, frame of broken lines II is the identifier circuit, and frame of broken lines III is a voltage-stabilized power supply, and they are as follows with being connected of high_frequency sine wave generator (dotted line I):

The A point of HM1 thick film circuit meets 24V, B point ground connection, the C point meets 12V, and the D point connects transistor Q3 base stage, and the E point connects transistor Q4 base stage, the F point connects the tie point of Q3 emitter stage and Q4 colelctor electrode, the H point connects the variable-resistance end of VR1, and the G point connects the central point of VR1, and the I point connects the other end of VR1, the J point connects the anode of LED, the minus earth of LED.Resistance R 2 one termination 24V, the colelctor electrode of another termination transistor Q3.The emitter stage of resistance R 3 one termination transistor Q4, other end ground connection.The tie point of resistance R 1 one termination Q3 emitter stages and Q4 colelctor electrode, the positive pole of another termination electrolytic capacitor C2, the negative pole of C2 connects an end of the primary side of high frequency transformer T2, the primary side other end ground connection of T2, secondary side one end of T2 connects the tie point of capacitor C1 and high-frequency rectification diode DL2 anode, a termination control device binding post 4# pile crown in the secondary side of T2, another termination control device binding post 3# pile crown of C1.

The A point of HM2 thick film circuit connects high-frequency rectification diode DL2 " cloudy altogether " end, one of DL2 anode connects the tie point of capacitor C 1 and high frequency transformer secondary side, two of DL2 anode connects the B point of HM2 and another point of high frequency transformer secondary side links to each other with electric welding machine output backflow row by binding post 4#, the C point of HM2 connects capacitor C 1 and links to each other with electric welding machine output backflow row by binding post 3# pile crown, the D point of HM2 is succeeded the anode of electrical equipment J2 coil and diode D2, the negative electrode of D2 connects another point of J2 coil, and and the normally open contact series connection 24V of relay J 1.The E point of HM2 is succeeded the anode of electrical equipment J1 coil and diode D3, and another point and SRE J3 normally-closed contact that the negative electrode of D3 connects the J1 coil meet 24V.The F point of HM2 meets 12V, and the G point meets 24V, and the H point connects the base stage of transistor Q1, I point ground connection, and the grounded emitter of Q1, the coil of collector connecting relay J3 and the anode of diode, the negative electrode of D1 connect the coil other end of J3 and connect the 24V power supply.

Principle is such: the power distributing cabinet switch that the power supply welding machine that closes is used, L1, L2 have single-phase 380V voltage, the control device AC power is connected, and the transformer primary side is not because the CJ10/40A coil has the 380V alternating voltage, is in the no power state, secondary side does not have floating voltage output.

The AC36V 50Hz voltage of T3 output is through noise filter circuit, and elimination electrical network clutter pollutes, and obtains pulsating direct current through mu balanced circuit by DL1, obtains 24VDC voltage, through the output of Q6 integrated circuit, obtains 12VDC voltage.DC24V, 12V voltage are exported behind filter circuit for sine-wave generator and identifier and are used.When G, the F of A, the C of HM1 point and HM2 point has 24VDC voltage and 12VDC voltage.High_frequency sine wave generator and the identifier high_frequency sine wave generator of starting working is seen Fig. 4 with thick film circuit.1 pin of IC1 is through C4, R6 output high_frequency sine wave voltage signal, 3 pin that enter the IC2 in 2# zone carry out voltage amplification, obtaining 15VP-P value high_frequency sine wave voltage at 1 pin of IC2 carries out electric current through Q1 and amplifies, export the high power transistor that D, E go to drive Q3 among Fig. 3, the amplification of Q4 electric current at 2, and at the emitter stage of Q3 and the colelctor electrode output high_frequency sine wave voltage of Q4.By R1, C2 excitation high frequency transformer T2, T2 secondary side output 10～20KHZ12～26V high_frequency sine wave voltage, be connected to knowledge device input C and B 2 points by C1, and by used for identifier on binding post 3#, the 4# connection electric welding machine output bus-bar, as shown in Figure 3.The A in 1 zone point is the input point of high_frequency sine wave identification voltage among Fig. 5, behind high_frequency sine wave voltage process C1 on the bus-bar and the high-frequency rectification DZ1 is punctured, 2 of A, B have electric current to flow through, PC1 fails high level, and SCR2 is triggered, and has entered the striking state for the treatment of, Q1 is saturated simultaneously, SCR1 is in non-triggering state, and J2 is in nonexcited state, for condition has been set up in operator's striking.Treating the striking state, there are 12～28V high_frequency sine wave voltage in 2# area B, C two ends among Fig. 5, DZ3, DZ4 are punctured, and DZ3, DZ4 are in cut-off state, and PC2 output high level makes 1 pin of IC1 export high level, Q2 enters saturation state, the J point voltage is zero, 7 output low levels of IC1, H point output low level, Q1 among Fig. 3 is in cut-off state, and J3 is in nonexcited state.2# region R 16, C5, D3, D4, R17, R18, C6, R19 form high_frequency sine wave output indicating circuit among Fig. 4.

No matter welding machine is in direct current or exchanges output state, the action of striking is arranged as the operator, in the moment of welding rod contact welded piece, " peak value " of each second 20～400,000 time changes and disappears on the bus-bar, the commutating voltage that the high-frequency rectification diode provides disappears fast, making that 1 region D Z1 voltage-stabiliser tube breaks away from " puncture " zone among Fig. 5 enters cut-off region, make that the electric current that flows through 2 of A, B is zero, PC1 enters cut-off state, make Q1 enter cut-off state, SCR1 is triggered, and has remembered the fact that the operator once required striking.The D point becomes low level, and J2 is energized, and control device lead-out terminal 5#, 6# connect, CJ10/40A A.C. contactor closure.The energising of electric welding machine main transformer primary side, secondary side is exported unloaded striking voltage, carries out the striking operation.After the striking, electric welding machine enters electric arc or Light Condition, and identifier guarantees the welding job under various conditions at the arc.After the striking when occurring greater than 0.8～1 second floating voltage among Fig. 52 regional voltage-stabiliser tube DZ3, DZ4 breakdown, the PC2 output low level, the 1 pin output low level of IC1, Q2 withdraws from saturated entering to be ended, make+24V voltage charges to C1 by R13, R14, when charging voltage 〉= The time, the 7 pin output high level of IC1, H point output high level, the Q1 among Fig. 3 is saturated, and J3 is energized, and makes J1, J2 dead electricity, closes the CJ10/40A A.C. contactor, cuts off the power supply of electric welding machine main transformer primary side, stops secondary side output, guarantees personal safety.

When occurring less than 0.8～1 second floating voltage, the operator recovers the electric welding operation again, 2 regional voltage-stabiliser tube DZ3, DZ4 withdraw from the breakdown area and enter cut-off region among Fig. 5, PC2 exports high level, the 3 pin voltages of IC1 are greater than 2 pin voltages, the 1 pin output high level of IC1 makes Q2 enter saturation state, and the J point voltage keeps 5 pin low levels, the 7 pin low levels of IC1 by R14 discharge, cancellation timing program in the past.H point low level.Treat that the identification of reclocking afterwards appears in floating voltage.D1 butt welding machine output AC/DC voltage transitions in the identifier.If artificially becoming D1 under the situation of plus or minus, the polarity on the soldering turret also can finish conversion to it.

Treating the striking state, the operator is accidental in narrow and small operation place to be contacted with soldering turret, and human body resistance is greater than 300 ohm, and welding machine main transformer primary side will can not switched on, and secondary side does not have floating voltage output, guarantees personal safety.

In the moment that carries out the transition to floating voltage from conditions at the arc, soldering turret takes place to fall to operator's situation on one's body, identifier will be within less than 0.8～1 second, and the power supply of closing welding machine primary side main transformer makes secondary side stop to export floating voltage, guarantees personal safety.

HF signal generator in the utility model also can adopt other high frequency linearity, alternating signal, for example triangular wave.

Claims

1, a kind of AC-DC welder arc strike control device, its formation contains executing agency, voltage-stabilized power supply, it is characterized in that: it is made up of voltage-stabilized power supply, HF signal generator, identifier; Wherein the input of high-frequency signal output 3#, the 4# of HF signal generator and identification circuit is connected in parallel on the electric welding machine output bus-bar jointly.

2, a kind of AC-DC welder arc strike control device according to claim 1, it is characterized in that: said HF signal generator is that the A point by the HM1 thick film circuit meets 24V, B point ground connection, the C point meets 12V, the D point connects transistor Q3 base stage, the E point connects transistor Q4 base stage, the F point connects the tie point of Q3 emitter stage and Q4 colelctor electrode, the H point connects the variable-resistance end of VR1, the G point connects the central point of VR1, the I point connects the other end of VR1, the J point connects the anode of LED, the minus earth of LED, resistance R 2 one termination 24V, the colelctor electrode of another termination transistor Q3, the emitter stage of resistance R 3 one termination transistor Q4, other end ground connection, the tie point of resistance R 1 one termination Q3 emitter stages and Q4 colelctor electrode, the positive pole of another termination electrolytic capacitor C2, the negative pole of C2 connects an end of the primary side of high frequency transformer T2, the primary side other end ground connection of T2, and secondary side one end of T2 connects the tie point of capacitor C1 and high-frequency rectification diode DL2 anode, a termination control device binding post 4# pile crown in the secondary side of T2, another termination control device binding post 3# pile crown of C1.

3, a kind of AC-DC welder arc strike control device according to claim 1, it is characterized in that: said identifier, be that A point by the HM2 thick film circuit connects high-frequency rectification diode DL2 " cloudy altogether " end, one of DL2 anode connects the tie point of capacitor C 1 and high frequency transformer secondary side, two of DL2 anode connects the B point of HM2 and another point of high frequency transformer secondary side links to each other with electric welding machine output backflow row by binding post 4#, the C point of HM2 connects capacitor C 1 and links to each other with electric welding machine output backflow row by binding post 3# pile crown, the D point of HM2 is succeeded the anode of electrical equipment J2 coil and diode D2, the negative electrode of D2 connects another point of J2 coil, and and the normally open contact series connection 24V of relay J 1, the E point of HM2 is succeeded the anode of electrical equipment J1 coil and diode D3, another point and SRE J3 normally-closed contact that the negative electrode of D3 connects the J1 coil meet 24V, the F point of HM2 meets 12V, the G point meets 24V, the H point connects the base stage of transistor Q1, I point ground connection, the grounded emitter of Q1, the coil of collector connecting relay J3 and the anode of diode, the negative electrode of D1 connect the coil other end of J3 and connect the 24V power supply.

4, a kind of AC-DC welder arc strike control device according to claim 1 is characterized in that: the high-frequency signal that HF signal generator produces is the high_frequency sine wave of 10KHZ～20KHZ.