CN2085698U

CN2085698U - Dc arc welder

Info

Publication number: CN2085698U
Application number: CN 91204292
Authority: CN
Inventors: 孙荣阶
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-03-25
Filing date: 1991-03-25
Publication date: 1991-10-02

Abstract

The utility model relates to a DC arc welder comprising a control circuit for generating silicon control grid modulation signals, an executive circuit for responding to the control grid signals and switching a main welding loop, a protective circuit for responding to over currents and over voltages in a power supply circuit and generating power-off or alarm signals or actions. The utility model omits required iron cores in a common arc welding machine, the size is small, and the weight is light; a knob on a welding torch only needs to be regulated, welding currents and voltages can be extensively regulated, and the operation is convenient.

Description

DC arc welder

The utility model relates to a kind of DC arc welder.

The arc-welding machine that uses both at home and abroad has heavy iron core at present, and there is following problems in this prior art: 1. the big weight of volume is big, has wasted a large amount of reactive loss and non-ferrous metal.2. can not remote operation.Sometimes the welder works in the high-altitude or in the ditch hole, away from the electric welding machine welding, when needs are regulated welding current, need get back to the electric welding machine place and regulate, and influences efficiency.

The purpose of this utility model provides a kind of no iron core, DC arc welder that can the remote control adjustment current/voltage.

The purpose of this utility model is achieved in that according to feature of the present utility model, it also comprises the control circuit that is used to produce the SCR control grid control signal; Be used to respond described control circuit control signal, make the executive circuit of main weldering loop break-make; With response current supply circuit overcurrent-overvoltage, produce the holding circuit of outage or alarm signal and action; Wherein control circuit output links to each other with executive circuit controllable silicon grid.According to the more detailed feature of the utility model, described control circuit is by Zener diode Z1, Z2, Z3, Z4, variable resistor R2, and resistance R 3, R4, R5, R7, capacitor C1, elementary triode BG1, output triode BG2, BG3 and transformer B1 form; The output tap of transformer B1 and the controllable silicon T2 in the executive circuit, T3 control grid links to each other; Described executive circuit is by controllable silicon T2, T3, and normally opened contact S21, the S22 of diode Z5, Z6, Z7, Z8 and relay S2 connect to form.The utility model also can be such, described control circuit comprises that three covers are by the single-phase control circuit of three phase mains by transformer B32, B33, B34 power supply, the single-phase control circuit of every cover is respectively by commutation diode, elementary triode BG31, output triode BG32, BG33, variable resistor R35, capacitor C31 and output transformer B31 connect to form; The base stage of wherein respectively overlapping elementary triode BG31 is connected in parallel on the variable resistor R32; Described executive circuit comprises the single-phase executive circuit of three covers, and the single-phase executive circuit of every cover is by controllable silicon Ti, Tj(i=4,6,8; J=5,7,9) the normally opened contact S2i(i=4 of relay S2,5,6), diode Zi(i=35,36,37,38,39,40) connect to form; Controllable silicon Ti wherein, Tj(i=4,6,8; J=5,7,9) control grid links to each other with the output tap of corresponding single-phase control circuit output transformer B31 mutually respectively.Described holding circuit comprises by K switch, normally-closed contact S31, the loop that relay J 1 constitutes, relay S2, normally opened contact J11, normally-closed contact S32 series arm and the relay S3 series arm formation that links to each other by electric capacity with electrode holder line E, F.Described variable resistor R2 or R32, K switch is installed on the welding gun 1.

Compared with prior art, advantage of the present utility model and good effect are significant.1. the utility model volume is little, and is in light weight, and the utility model has saved the needed iron core of general arc-welding machine, adopts controllable silicon to transfer stream, pressure regulation, saved a large amount of non-ferrous metals.2. the utility model can carry out straighforward operation, and the welder need only regulate by the Butt welding gun upper knob, can regulate the size of electric current on a large scale, does not pull tune switch and must not leave the job site to place, weldering railway carriage or compartment, has improved efficiency.3. the utility model floating voltage is low, meets the countries concerned's standard.

Fig. 1 is the utility model complete machine structure schematic diagram.

Fig. 2 is first kind of embodiment circuit theory diagrams of the utility model.

Fig. 3 is second kind of embodiment control circuit of the utility model schematic diagram.

Fig. 4 is second kind of embodiment executive circuit of the utility model schematic diagram.

Fig. 5 is the utility model holding circuit schematic diagram.

Referring to Fig. 1, welding gun 1, cage 2, by-pass cock 3, circuit board 4 are formed in the utility model, are equipped with blower fan 9 above cage 2 installed in front have indicator lamp 5, voltage, ammeter 6, attaching plug 7, cage 2, and welding gun is connected by cable 8 with cage 2.

Referring to Fig. 2, show the utility model and be applied to embodiment under the single phase poaer supply situation.In the present embodiment; power supply is the 220V single-phase alternating current; the present embodiment circuit is made up of control circuit executive circuit and holding circuit; control circuit is by transformer B2; voltage stabilizing commutation diode Z1, Z2, Z3, Z4, CW1, CW2, elementary triode BG1, output triode BG2, BG3 regulate resistance R 2; transformer B1, variable resistor R8, R9 form.220 volts of power supplys are through synchrotrans B2 step-down, supply with Z1, Z2, Z3, Z4, rectification, R1 step-down current limliting, voltage-stabiliser tube CW1, the voltage stabilizing of CW2 slicing, the bleeder circuit that resistance R 2, R3 constitute offers a control of elementary triode BG1 amplifying signal, when capacitor C 1 is charged to peak value, the emitter stage discharge of 1 couple of triode BG2 of capacitor C, thereby on the resistance R 7 that the BG2 emitter stage links to each other, produce a pulse signal, through the grid-control voltage signal of transformer B1 at variable resistor R8, R9 one end output controllable silicon T3, T2.

Executive circuit is by two reverse and connect controllable silicon T2, T3 and inductive choke coil L, single-phase bridge rectification diode Z5, Z6, Z7, Z8 form, wherein 2 of E, F link to each other with welding gun and weldment respectively among the figure, E point and commutation diode Z5, Z7 loop are serially connected with inductance L, are serially connected with normally opened contact S21, the S22 of relay S2 on the 220V electric power loop.The break-make of controllable silicon T2, T3 is regulated control by the output of transformer B1.

Referring to Fig. 3 and Fig. 4, show second kind of embodiment circuit theory diagrams of the utility model.In the present embodiment, adopt three phase mains to supply with synchrotrans B32, B33, B34, supply with A, B among Fig. 4, C three cover SCR control circuit through the transformer step-down.Shown in dashed rectangle among the figure, wherein the B phase control circuit is identical with the A phase control circuit.It is similar respectively to overlap among the operation principle of control circuit and first embodiment single phase power supply situation in the present embodiment.But in the present embodiment, voltage on the adjusting resistance R 32 is provided through Z35～Z40 bridge rectifier by a, b, the c tap of transformer B32, B33, B34, and the dividing potential drop of regulating resistance R 32 offers elementary triode BG31, output triode BG32, a control of BG33 amplifying signal.Variable resistor R38, R39 are used to regulate the symmetry of No. three control circuits output triggering signal.In the present embodiment, major loop and transformer B32, B33, B34 are by the bussed supply of A, B, C three-phase four-wire system.The dotted line that Fig. 3 is identical with Fig. 4 label is connected to each other.

Can work under normal temperature for the assurance welding machine, the utility model is provided with single-phase at different embodiment or three-phase blower fan FJ, and when welding machine was worked, blower fan FJ opened thereupon, makes cooling in the welding machine railway carriage or compartment.

The controllable silicon that the utility model executive circuit is adopted, its forward and reverse withstand voltage should be greater than 1200V, drawn in the accompanying drawing is one-way SCR, if with two one-way SCRs in the bidirectional triode thyristor replacement one mutually, but the utility model is operate as normal also, at this moment the output tap of transformer B31 only needs a pair of get final product, and one of tap is through the variable resistor pressure regulation, controls grid with bidirectional triode thyristor and links to each other and get final product.

Consider the trouble free service of welding machine, the utility model is provided with holding circuit, and Fig. 5 shows the utility model holding circuit schematic diagram.A among the figure; N links to each other with zero line with power firestreak respectively; this holding circuit is by K switch; relay S3 normally-closed contact S31; relay J 1 series loop; relay J 1 normally opened contact J11; relay S3 normally-closed contact S32; blower fan relay S1; main circuit relay S2 series arm; the normally opened contact S23 of relay S2 and relay indicating light D1 series arm; the normally opened contact S33 of relay S3 and malfunction indicator lamp D2 series arm; the normally opened contact S34 of relay S3 and fault alarm bell DL series arm; the branch road that is connected in parallel is formed, and it comprises that also relay S3 is connected branch road with source of welding current point E with ground wire point F.

Holding circuit is work like this, and in the time will welding, the normally opened contact S31 of K through relay S3 closes a switch earlier; make relay J 1 get electric work, normally opened contact J11 adhesive gets relay S1, S2 through normally-closed contact S32; major loop normally opened contact S2i(i=1,2,3; 4,5,6) adhesive; the bright D1 of relay indicating light, blower fan loop normally opened contact S1i(i=1,2; 3) adhesive, blower fan work makes the cooling of welding machine cage.Regulate resistance R 2 or R32, just can reach the adjusting thyristor operating angle, regulate the purpose of welding current size.

When breaking down, breakdown entirely as controllable silicon or diode, there is the power supply alternating current to seal between E, the F, it is electric that this voltage gets relay S3 through E or F point, the normally opened contact S33 of S3, S34 adhesive, and D2 is shinny for normally-closed contact S31, S32 open failure indicator lamp, fault alarm bell DL rings, and normally-closed contact S32 disconnects, and makes the blower fan stall, main circuit relay S2 is electricity earlier, original closed normally opened contact S2i(i=1,2,3,4,5,6) all disconnect, welding machine has a power failure fully.If because of a certain phase factor high pressure seals in big electric current, the utility model is promptly fused at the fuse P that major loop was connected in series, and the welding machine outage is quit work, and plays the effect of maltilevel security protection.Here, single-phase holding circuit structure with the three-phase welding machine is identical.

By-pass cock 3 shown among the utility model Fig. 1 is for K switch and adjustable resistance R2 or R32 among Fig. 2, Fig. 3 embodiment; when by-pass cock 3 is pulled out; K switch is connected; adjustable resistance R2 or R32 can be regulated by by-pass cock 3 rotations, and holding circuit, executive circuit, the main components and parts of control circuit are installed on the circuit board 4.

Claims

1, DC arc welder comprises welding gun 1, cage 2, blower fan 9, it is characterized in that it also comprises the control circuit that is used to produce the SCR control grid control signal; Be used to respond described control circuit control signal, make the executive circuit of main weldering loop break-make; With response current supply circuit overcurrent-overvoltage, produce the holding circuit of outage or alarm signal and action; Wherein control circuit output links to each other with executive circuit controllable silicon grid.

2, the DC arc welder of saying by claim 1 is characterized in that described control circuit by Zener diode Z1, Z2, Z3, Z4, variable resistor R2, resistance R 3, R4, R5, R7, capacitor C1, elementary triode BG1, output triode BG2, BG3 and transformer B1 form; The output tap of transformer B1 and the controllable silicon T2 in the executive circuit, T3 control grid links to each other; Described executive circuit is by controllable silicon T2, T3, and normally opened contact S21, the S22 of diode Z5, Z6, Z7, Z8 and relay S2 connect to form.

3, the DC arc welder of saying by claim 1, it is characterized in that described control circuit comprises that three covers are by the single-phase control circuit of three phase mains by transformer B32, B33, B34 power supply, the single-phase control circuit of every cover is respectively by commutation diode, elementary triode BG31, output triode BG32, BG33, variable resistor R35, capacitor C31 and output transformer B31 connect to form; The base stage of wherein respectively overlapping elementary triode BG31 is connected in parallel on the variable resistor R32; Described executive circuit comprises the single-phase executive circuit of three covers, and the single-phase executive circuit of every cover is by controllable silicon Ti, Tj(i=4,6,8; J=5,7,9) the normally opened contact S2i(i=4 of relay S2,5,6), diode Zi(i=35,36,37,38,39,40) connect to form; Controllable silicon Ti wherein, Tj(i=4,6,8; J=5,7,9) control grid links to each other with the output tap of corresponding single-phase control circuit output transformer B31 mutually respectively.

4, the DC arc welder of saying by claim 1; it is characterized in that described holding circuit comprises by K switch; normally-closed contact S31; the loop that relay J 1 constitutes; relay S2; normally opened contact J11, normally-closed contact S32 series arm with constitute with relay S3 series arm that electrode holder line E, F link to each other by electric capacity.

5, by claim 2 or 3 or 4 DC arc welders of saying, it is characterized in that described variable resistor R2 or R32, K switch is installed on the welding gun 1.