CN109396607A - A kind of inversion multifunctional welding machine - Google Patents

A kind of inversion multifunctional welding machine Download PDF

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Publication number
CN109396607A
CN109396607A CN201811477037.8A CN201811477037A CN109396607A CN 109396607 A CN109396607 A CN 109396607A CN 201811477037 A CN201811477037 A CN 201811477037A CN 109396607 A CN109396607 A CN 109396607A
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China
Prior art keywords
welding
control
voltage
circuit
current
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CN201811477037.8A
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CN109396607B (en
Inventor
蔡献
魏继昆
陈权
朱宣辉
陈法庆
朱宣东
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Zhejiang Kende Mechanical and Electrical CO Ltd
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Zhejiang Kende Mechanical and Electrical CO Ltd
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Priority to CN201811477037.8A priority Critical patent/CN109396607B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/013Arc cutting, gouging, scarfing or desurfacing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/32Accessories

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

The present invention relates to a kind of inversion multifunctional welding machines, its be mainly characterized by front control plate equipped with manual welding, gas shield welding, inspection gas, receive arc without, receive that arc has, initial stage has, medicine core and solid core welding wire, three kinds of gage of wire, initial stage, welding, the selection key and its their indicator light for receiving arc;Electric current, voltage adjust encoder;Power supply, overheat and network pressure exception indicator light;Channel number, electric current and the voltage of welding procedure are shown;Storage, call the parts such as selection key in channel, interior design is upper and lower two layers, upper layer is equipped with the components such as input filter plate, front control plate, control transformer, input filter common mode inductance, master board, driving plate, lower layer is equipped with the components such as IGBT, rectifier bridge, filter inductance, electrolytic capacitor, fast recovery diode, radiator, saturation resonant inductance, resonant capacitance, cooling blower, main transformer, output reactance device, controlling system of welder uses microprocessor as the control circuit of core, can meet the requirement of three kinds of welding methods.

Description

A kind of inversion multifunctional welding machine
Technical field
The present invention relates to a kind of inversion multifunctional welding machines, in inverter type welder technical field.
Technical background
Currently, the competition in contravariant MIG/MAG gas shielded welding machine product market is very fierce, it is not only embodied in technology In advanced and advantage, circuit and its function and structure design of welding machine etc. are also depended greatly on.
On domestic and international market, the rated current of IGBT pipe contravariant MIG/MAG gas shielded welding machine is usually in 140 ~ 630A The level of (cyclic duration factor 100 ~ 35%).The most of such welding machine control of product technology backwardness, performance relative mistake one relatively A bit, application range will receive certain limitation.
For the welding machine of multi-functional digitlization Advanced Control Techniques, i.e., manual electric arc welding, carbon arc air gouging function also can be used The digitlization gas shielded welding machine of energy, since its is more adaptable, performance is more preferable, thus range of its application can be wider.Product Sale can be more added with the market competitiveness.Such source of welding current, different circuits, circuit board and complete machine structure design, control principle Different with mode, the layout and connection type of circuit board and complete machine, or the complexity of connection are different, the work of production Sequence and manufacture craft etc. are also entirely different.These can all influence the production and transportation cost of product.Although also there is use in the market The multifunctional welding machine of Digital Control, but its technical characteristic, performance, exploitation and the cost of production, and the price of sale, product The market competitiveness etc. all can be variant.Therefore, how under the premise of low cost and high performance requirements, multi-functional number is developed The word source of welding current has certain technical difficulty.This is also problem to be solved of the present invention.
Summary of the invention
The object of the present invention is to provide a kind of inversion multifunctional welding machines, have manual electric arc welding, carbon arc air gouging and MIG/MAG The function of three kinds of welding methods of gas shielded arc welding.
In addition the source of welding current of the present invention has the control line socket that connect with external wire feeder, can be normal in the market It is attached with wire feeder, realizes gas shield welding function.
The source of welding current of the present invention, two groups of output rapid connector components are for being separately connected welding clamp cable when manual electric arc welding With workpiece clamp cable.Polarity when connection can determine the mode of connection according to the type and requirement of welding rod;Two when carbon arc air gouging Group output rapid connector component is for being separately connected gouge pincers cable and workpiece clamp cable;When gas shield welding, the control of wire feeder Line is correspondingly connected with the socket on front panel, and wire feeder is a universal component, is controlled when having gas shield welding on box Welding current and voltage adjust potentiometer, and there are also the crawl wire feed buttons for welding wire installation;Welding gun then connects with wire feeder Mouthful connection, the connection of the welding cable and the source of welding current of wire feeder, depend on polarity mode, connection type be divided into reversal connection and just Polarity connection, the requirement of type and welding procedure depending on gas shield welding wire;It is using reversal connection, i.e. power supply under normal circumstances Negative polarity output quick coupling is connected to workpiece, and the MIG/MAG welding gun of wire feeder is then connected to the positive polarity of the source of welding current Output end.
Following technical scheme is used to achieve the above object:
A kind of inversion multifunctional welding machine, including consisting of part:
Casing part, casing part include handle, machine upper cover, case backboard, case front panel, cabinet left plate, the cabinet right side Side plate, bottom plate.
The components of rear panel part, the installation of rear panel part mainly have: power switch or breaker and its installation are fixed Bracket, power supply line input wires terminal and its shield, cooling blower, 36VAC output gas cylinder power supply socket (are used for The power supply of shield gas flow rate meter) etc. parts thereofs.Power supply line is connected to power supply grid by input wires terminal.Power supply is opened Pass or breaker 28 control the on-off of input power.Cooling blower carries out forcing wind to some components of welding power source internal It is cold.Cooling blower is mounted on the rear portion of power supply, and the air inlet of cold wind postlaminar part behind welding machine case enters, and can make the source of welding current Internal some heating devices or components, such as IGBT and its radiator, fast recovery diode and radiator components obtain To preferable cooling.Such air duct and type of cooling design are conducive to the reliability and this hair that ensure internal circuit work The bright source of welding current realizes the one of the major reasons of larger current and high load water holdup.
Front-facing portion, front-facing portion are equipped with: current detecting Hall sensor, negative polarity output or fast quick access Head assembly, positive polarity output terminal or rapid connector component, the six core aerial plug-in units for the connection of wire-feed motor control line or socket, The components such as front panel or front control plate component.Be equipped on preceding control panel manual welding and gas shield welding conversion keys and it Indicator light;" inspection gas " key and its indicator light;" receive arc without " of gas shield welding, " receiving arc has " and " initial stage has " selection key, And their indicator light." receive arc without " mode, which refers to, presses arc welding gun switch, starts to weld.Arc welding gun switch is unclamped, then terminates to weld Connect operation." receiving arc has " mode, which refers to, presses arc welding gun switch, starts to weld.Arc welding gun switch is unclamped, continues to weld.It presses again Lower arc welding gun switch, starts receive the welding control of arc stage, terminates welding operation until unclamping arc welding gun switch;The welding wire of gas shield welding Material, i.e. " medicine core ", " solid core " welding wire selection key and their indicator light;Three kinds of gage of wire selection keys and it Indicator light;The parameter setting or selection key in " initial stage ", " welding " and " receive arc " three welding process stages and they Indicator light;Electric current and voltage encoder and adjusting knob;Power supply indicator, overheating indicator lamp and network pressure exception indicator light;Weldering Connect " channel " number code tube display, " channel selecting ", " storage ", " calling " selection key of program;Electric current and voltage are digital The circuit devcies such as tube display part.Under the action of microprocessor control system, it can also make electric current, voltage in attached drawing 4 aobvious Show that charactron requires parameter when showing the states such as preset or actual welding according to the control of setting.Make the port number in attached drawing 4 Code pipe requires the number of display welding procedure or specification according to the control of setting.
Control panel is more intuitive, and user is readily appreciated that and operates.For example, power supply indicator is lighted after welding machine is powered.Such as Fruit can press welding side then after connecting electrode holders and workpiece welding cable without gas shield welding, Yao Jinhang manual electric arc welding Method selection key selects " manual welding ".Meanwhile corresponding manual welding indicator light is lighted.At this point, by adjusting current encoded device, Welding current is chosen, can be welded.Carbon arc air gouging is such as carried out, then must connect carbon arc air gouging pincers and workpiece welding After cable, it may be selected " manual welding ".At this point, corresponding manual welding indicator light is lighted.Welding electricity is chosen by current encoded device Stream, can carry out carbon arc air gouging operation.If it is gas shield welding operation to be carried out, then wire feeder and workpiece welding must be being connected After cable, it may be selected " gas shield welding ".At this point, corresponding gas shield welding indicator light is lighted.For manual welding and carbon arc air gouging, Selection operation item and the parameter to be set are more.For example, it is desired to select corresponding solid core or medicine core to weld according to the material of welding wire Silk;It needs to select corresponding gage of wire according to the actual diameter of welding wire;The mode of operation according to arc welding gun switch is needed, by function Switching key, selection " receive arc without " or " receiving arc has ";If being selected " initial stage has " by pressing function switch key, then by pressing " initial stage " key, the striking current and voltage of welding incipient stage can be set by recycling electric current and voltage to adjust encoder.Such as Fruit is persistently by " initial stage " key 5 seconds or more under gas shield welding, then welding machine enters " unified " adjustment state, as long as adjusting one A welding parameter, other welding parameters change automatically therewith.It, can in the case where selection " initial stage has " or " receiving arc has " It lights and receives arc indicator light.When lighting receipts arc indicator light, encoder settings welding is adjusted using electric current and voltage and receives the arc stage Receipts arc current and voltage.In the case where selection " welding ", welding indicator light can be lighted.It, can when lighting welding indicator light Utilize the electric current and the welding current and voltage in voltage adjusting potentiometer setting welding stage on wire feeder control box panel.When When there is superheating phenomenon in the welding machine course of work, overheating indicator lamp can be lighted.It must check whether the cooling fan of welding machine operates just Often, the phenomenon that whether there is or not environment temperatures.If no, being overheat caused by built-in temperature is excessively high during normal weld.At this point, weldering Machine stops welding for a period of time, and after a certain period of time to fan coolling, superheating phenomenon can be eliminated automatically.When network pressure indicates extremely When lamp is lighted, it may be possible to power supply over-voltage or under-voltage or open-phase fault occur.It needs to check, until debugging side It can be operated.Channel number can show 0~9 number, can represent 10 group welding programs.It, can be 0~9 by channel selecting key Between sequence varying cyclically.By " calling " key, the corresponding welding procedure of number or standard parameter can be directly selected.Work as access points When bright, " storage " key is pressed, current welding variables can be stored into corresponding channel number and be saved, when to use Call directly the welding procedure of storage or setting.When pressing " inspection gas " key, the flow of protective gas when can check gas shield welding Or phenomena such as whether there is or not gas leakage.Be above some panels operation control be briefly described.There can be one to control panel of the invention It is intuitive to understand.
The inside of welding machine is divided into upper and lower two layers.Upper layer is mainly disposed with input filter plate, preceding control circuit board, control change Depressor, input filter common mode inductance, master board, driving plate.Lower layer be mainly disposed with IGBT and its driving platelet, rectifier bridge, Filter inductance, big electrolytic capacitor and its fixed plate, IGBT radiator, fast recovery diode and its resistance-capacitance protection plate restore two fastly Pole pipe radiator, cooling blower, saturation resonant inductance, resonant capacitance, inversion main transformer, output high current filter reactor, The fixation bracket of Hall current sensor, radiator.
The hierarchical design in terms of above structure, the purpose is to the inside upper layer vulnerabilities scan portions by intermediate bulkhead welding machine Divide and is separated with the forceful electric power circuit part of lower layer.Upper layer vulnerabilities scan part is equivalent to by intermediate bulkhead, shell, bottom plate, rear panel It is surrounded with the shell of front panel composition.Isolation lower layer's high current strong electromagnetic can be played, limit electromagnetic radiation, improve welding electricity The effect of source functional reliability.
The control circuit board of welding machine is designed as ten pieces, including preceding control circuit board or panel, driving plate, IGBT driving are small Plate, output fast recovery diode resistance-capacitance protection plate, master board, input filter platelet, output filtering platelet.Every piece of control panel is all There is respective circuit part, carries different control functions.For example, two pieces of IGBT driving platelets are welded respectively in two IGBT The drive control end of module.In each IGBT module, there are two IGBT to manage.Being welded on IGBT driving platelet has voltage-stabiliser tube and electricity Resistance, three blocks of output fast recovery diode resistance-capacitance protection plates are then mounted on corresponding fast recovery diode module, each fast In recovery diode module, there are two fast recovery diodes.Output fast recovery diode resistance-capacitance protection plate on be welded have capacitor and Resistance, resistance and capacitor are concatenated.Every group of both ends for being connected in parallel on fast recovery diode, form rc protection circuit, prevent fast Recovery diode is damaged because of over-voltage breakdown;There are capacitor C1~C3, protective tube F1 and capacitor in primary placements on input filter platelet The devices such as C4, capacitor C1~C3 are connected to the rear end of welding machine input filter inductance L1, play the work of anti-High-frequency Interference in circuit With.Protective tube F1 is connected to control transformer TC1, and capacitor C4 is connected to the rear end of rectifier bridge V1, also functions to anti-height in circuit The effect of frequency interference.Design has the driving circuit and inversion pwm control circuit of IGBT, and overheat and overcurrent protection in driving plate Control circuit and temperature protection signal WD output etc. parts, mainly complete IGBT switching tube driving, the generation of pwm pulse and Output control, and the work such as overheat and overcurrent protection control.
Between each circuit and components of welding machine, circuit diagram relationship according to the invention links together.It can meet The use of manual welding or carbon arc air gouging and three kinds of welding methods of MIG/MAG gas shielded arc welding, which controls, to be required.For example, through the invention Control circuit, it is convenient to realize: 1) manual welding/gas shield welding power and energy;2) manual welding output characteristics and state modulator;3) " inspection gas " control when MIG/MAG gas shield welding;Preflow lags time control of holding one's breath;The selection control of welding wire material;Welding wire is straight Diameter selection control;" receive arc without " of gas shield welding, " receiving arc has " and " initial stage has " selection control;" initial stage ", " welding " and " receiving arc " The parameter setting or the control such as selection control and output characteristics, voltage and wire feed rate parameter regulation in three welding process stages System;3) under different welding methods, " channel selecting " of welding parameter or welding procedure, " storage ", " calling " control.
The control system of welding machine of the present invention uses the control circuit that MCU microprocessor forms for core.Many control It is realized using the circuitry digitizing control mode of soft and hardware.Circuit is not only simplified, properties of product and reliable are also improved Property.
Components' placement on the specific structure and control circuit principle of welding machine each section of the present invention and some circuit boards, is shown in Shown in relevant drawings that patent specification provides and its explanation.
Circuit is mainly installed and are welded on to control circuit board of the invention, electronic component by way of automatic job On plate, thus the production process of circuit board is simplified, reduces manufacturing cost.Meanwhile optimizing production and processing process, production Technique is also simplified, more convenient production.
It, can be by adjusting a small amount of components to the source of welding current of the present invention that different current classes and cyclic duration factor require Specifications parameter forms the product of different output rated current and cyclic duration factor, makes product seriation.For example, changing IGBT device The current class and heat sink size of part;Change the model and parameter of fast recovery diode;Change inversion main transformer and defeated The specification and parameter etc. of filter reactor out, can different size easy to form series of products.Such as 315A~500A product. Rated current is smaller, then rated duty cycle is higher.Certainly, these change, it is therefore an objective to make the cost of manufacture of product and phase The specifications parameter and performance indicator for answering machine match.In this way, the welding machine of every kind of specifications and models is just able to achieve the cost of optimization Control.This just improves the market competitiveness of institute's development.Therefore, the source of welding current of the present invention, not only welding method is multi-functional, Solve the problems, such as that simple function source of welding current application surface is narrow, and the circuit theory of the source of welding current, circuit board and complete machine structure Design has the unique distinction of oneself.This is also where applying for the basic goal of this patent protection.
The source of welding current of the present invention, due to the use function with gas shield welding and manual welding, three kinds of welding methods containing carbon arc air gouging Can, solve the problems, such as that simple function welding machine application surface is narrow, thus have better adaptability than the welding machine of simple function.It is good Circuit and its where structure design is also advantage of the invention, and meet high efficiency and low cost production, high reliability, manufacture The important leverage of technical advance.Circuit theory, circuit board and the complete machine structure design of the source of welding current of the present invention have the only of oneself Special place.The content of present patent application protection is that the circuit for protecting this welding machine and structure design.
Detailed description of the invention
The decomposition texture schematic diagram of Fig. 1 welding machine of the present invention;
Fig. 2 is the schematic block circuit diagram (one) of welding machine of the present invention;
Fig. 3 is the schematic block circuit diagram (two) of welding machine of the present invention;
Fig. 4 is the preceding control panel schematic diagram of the welding machine of welding machine of the present invention;
Fig. 5 is the driving plate schematic diagram of welding machine of the present invention;
Fig. 6 is the master board schematic diagram (one) of welding machine of the present invention;
Fig. 7 is the master board schematic diagram (two) of welding machine of the present invention;
Fig. 8 is the master board schematic diagram (three) of welding machine of the present invention;
The master board schematic diagram (four) of Fig. 9 welding machine of the present invention;
Figure 10 is under-voltage phase shortage and over-voltage detection protection circuit in welding machine main control circuit of the present invention;
The corresponding title of each component is as follows in Fig. 1:
Serial number Component names Serial number Component names
1 Machine upper cover 30 Aluminium column B afterwards
2 Control transformer 31 Blower mesh enclosure
3 Input common mode inductance 32 Cabinet-back plate
4 Three-phase filter band 33 Blower
5 Driving plate fixed plate 34 Cabinet-bottom plate
6 Driving plate 35 Wheel afterwards
7 Control panel 36 Cabinet-left plate
8 Middle partition 37 Preceding wheel
9 Main transformer 38 Preceding aluminium column A
10 Export filter band 39 Cabinet-front panel
11 Resonant capacitance 40 Cabinet-front plate net cover
12 Resonant inductance 41 Front panel
13 Input filter inductance 42 Current regulation and voltage adjust potentiometer
14 Commutating inductance 43 Preceding aluminium column B
15 Fast recovery diode and baffle 44 Aluminum pipe B
16 Fast recovery diode radiator 45 Cabinet output terminal fixed plate
17 Cooling fin fixes bracket A 46 Six core aerial plug-in units
18 Aluminium column A afterwards 47 Positive output terminals
19 IGBT module radiator 48 Negative output terminals
20 Three phase rectifier module 49 Export copper connector
21 Filter capacitor 50 Hall sensor
22 IGBT module 51 Capacitor fixed plate
23 Bridge arm capacitor 52 Frame for fixing heat sink
24 Three-phase input connecting terminal 53 Input copper connector
25 Aluminum pipe A 54 Radiate fixed insulation board
26 Gas cylinder power supply base 55 Frame for fixing heat sink B
27 Fuse holder 56 Electrolytic capacitor
28 Breaker 57 Reactance
29 Breaker fixes bracket 58 Cabinet right side plate
Specific embodiment
Attached drawing 1 is to utilize a kind of structure design diagram of the multi-functional example welding machine of IGBT inversion made of the present invention, more Function refers to three kinds of MIG/MAG gas shielded arc welding, manual electric arc welding, carbon arc air gouging welding methods.Welding electricity of the invention Source needs to configure wire feeder part, could constitute complete gas-shielded welder.The wire feeder matched outside is the component of a standard. The control line of wire feeder can the wire-feed motor socket through the invention below source of welding current front panel be attached.And the socket The mode of connection be also with most of product be in the market the same, be substantially exactly the wire-feed motor interface an of standard.It closes In wire feeder part, this specification be will not be further described.Only the source of welding current is stressed.Its main composition portion Divide and includes:
1) casing part.It is right including handle, machine upper cover 1, case backboard 32, case front panel 39, cabinet left plate 36, cabinet The components such as side plate 58, bottom plate 34.
2) rear panel part.The components installed on source of welding current rear panel of the present invention mainly have: power switch or open circuit Device 28 and its mounting and fixing bracket 29, power supply line input wires terminal and its shield 24, cooling blower 33,36VAC are defeated Power supply of the gas cylinder power supply socket 26(based on shield gas flow rate out) etc. parts thereofs.Power supply line passes through input wires Terminal 24 is connected to power supply grid.Power switch or breaker 28 control the on-off of input power.33 pairs of cooling blower welding Some components of power source internal carry out forced air cooling.Cooling blower 33 is mounted on the rear portion of power supply, and cold wind is after welding machine case The air inlet of panel rear enters, and can make some heating devices or the components inside the source of welding current, as IGBT and its radiator, The components such as fast recovery diode and radiator are preferably cooled down.Such air duct and type of cooling design, are conducive to Ensure that the reliability of internal circuit work, and the source of welding current of the present invention realize the important original of larger current and high load water holdup One of because.
3) front-facing portion.The components of installation mainly have: current detecting Hall sensor 50, negative polarity output son or Rapid connector component 48, positive polarity output terminal or rapid connector component 47, the 6 core aviations connected for wire-feed motor control line are inserted The components such as part or socket 46, front panel or front control plate component 41.Manual welding (gas containing carbon arc is equipped on preceding control panel 41 Plane) and gas shield welding conversion keys and their indicator light (note: lighting a certain indicator light, then shows corresponding option or control State is effective.Similarly hereinafter);" inspection gas " key and its indicator light;" receive arc without " (the arc welding gun switch 2T operation mode) of gas shield welding " is received Arc has " (arc welding gun switch 4T operation mode) and " initial stage has " selection key and their indicator light." receive arc without " (2 steps, 2T) Mode, which refers to, presses arc welding gun switch, starts to weld.Arc welding gun switch is unclamped, then terminates welding operation." receiving arc has " side (4 steps, 4T) Formula, which refers to, presses arc welding gun switch, starts to weld.Arc welding gun switch is unclamped, continues to weld.Press arc welding gun switch again, start into Row receives the welding control of arc stage, terminates welding operation until unclamping arc welding gun switch;The welding wire material of gas shield welding, i.e. " medicine core ", " reality Core " welding wire selection key and their indicator light;Three kinds of gage of wire (1.0,1.2 and 1.6mm) selection keys and it Indicator light;The parameter setting or selection key in " initial stage ", " welding " and " receive arc " three welding process stages and they Indicator light;Electric current and voltage encoder and adjusting knob;Power supply indicator, overheating indicator lamp and network pressure exception indicator light;Weldering Connect " channel " number code tube display, " channel selecting ", " storage ", " calling " selection key of program;Electric current and voltage are digital The parts such as tube display.
Control panel is more intuitive, and user is readily appreciated that and operates.For example, power supply indicator is lighted after welding machine is powered.Such as Fruit can press welding side then after connecting electrode holders and workpiece welding cable without gas shield welding, Yao Jinhang manual electric arc welding Method selection key selects " manual welding ".Meanwhile corresponding manual welding indicator light is lighted.At this point, by adjusting current encoded device, Welding current is chosen, can be welded.Carbon arc air gouging is such as carried out, then must connect carbon arc air gouging pincers and workpiece welding After cable, it may be selected " manual welding ".At this point, corresponding manual welding indicator light is lighted.Welding electricity is chosen by current encoded device Stream, can carry out carbon arc air gouging operation.If it is gas shield welding operation to be carried out, then wire feeder and workpiece welding must be being connected After cable, it may be selected " gas shield welding ".At this point, corresponding gas shield welding indicator light is lighted.For manual welding and carbon arc air gouging, Selection operation item and the parameter to be set are more.For example, it is desired to select corresponding solid core or medicine core to weld according to the material of welding wire Silk;It needs to select corresponding gage of wire according to the actual diameter of welding wire;The mode of operation according to arc welding gun switch is needed, by function Switching key, selection " receive arc without " (2T mode) or " receiving arc has " (4T mode);If by pressing function switch key, selection " initial stage has ", then by that by " initial stage " key (note: in the case where selection " initial stage has ", " initial stage " key could be selected, lighted Corresponding initial stage indicator light.), recycle electric current and voltage adjust encoder can set the welding incipient stage striking current and Voltage.If it is persistently pressing under gas shield welding " initial stage " key 5 seconds or more, then welding machine enters " unified " adjustment state, i.e., only A welding parameter (such as weldingvoltage) is adjusted, other welding parameters (such as electric current or wire feed rate) are automatic therewith to be changed. In the case where selection " initial stage has " or " receiving arc has " (4T mode), it can light and receive arc indicator light.Arc instruction is received when lighting When lamp, the receipts arc current and voltage that the arc stage is received in encoder settings welding are adjusted using electric current and voltage.In selection " welding " In the case where, welding indicator light can be lighted.When lighting welding indicator light, using the electric current on wire feeder control box panel The welding current and voltage in potentiometer setting welding stage are adjusted with voltage.When there is superheating phenomenon in the welding machine course of work, Overheating indicator lamp can be lighted.The phenomenon that palpus checks whether the cooling fan of welding machine works well, and whether there is or not environment temperatures.If no, It is then overheat caused by built-in temperature is excessively high during normal weld.At this point, welding machine stops welding for a period of time, to fan After a certain period of time, superheating phenomenon can be eliminated automatically for cooling.When network pressure exception indicator light is lighted, it may be possible to power supply occur Over-voltage or under-voltage or open-phase fault.It needs to check, until debugging can be operated.Channel number can show 0~9 Number can represent 10 group welding programs.By channel selecting key, can between 0~9 sequence varying cyclically.By " calling " key, The corresponding welding procedure of number or standard parameter can be directly selected.When channel is lighted, " storage " key is pressed, it can be current welding Standard parameter storage is saved into corresponding channel number, and the welding procedure of storage or setting is called directly when to use. When pressing " inspection gas " key, the flow of protective gas or phenomena such as whether there is or not gas leakage when can check gas shield welding.It is some faces above The operation control of plate is briefly described.There can be an intuitive understanding to control panel of the invention.
As shown in Fig. 1.The source of welding current of the present invention, two groups of output rapid connector components 47,48 are used for when manual electric arc welding It is separately connected welding clamp cable and workpiece clamp cable.Polarity when connection can determine connection according to the type and requirement of welding rod Mode.Two groups of output rapid connector components 47,48 are for being separately connected gouge pincers cable and workpiece clamp cable when carbon arc air gouging.Gas When protecting weldering, the socket on the control line and front panel of wire feeder is correspondingly connected with.Wire feeder is a universal component, There are welding current and voltage when gas shield welding to adjust potentiometer on control box, there are also the crawl wire feed buttons for welding wire installation. Welding gun is then connect with the interface of wire feeder.The connection of the welding cable and the source of welding current of wire feeder depends on polarity mode. Connection type is divided into reversal connection and connects with positive polarity.The requirement of type and welding procedure depending on gas shield welding wire.Ordinary circumstance Under be using reversal connection, i.e. the negative polarity output quick coupling of power supply is connected to workpiece, and the MIG/MAG welding gun of wire feeder then connects It is connected to the positive polarity output terminal of the source of welding current.
The source of welding current of the present invention has the control interface 46 connecting with external wire feeder.It can be sent in the market common Silk mechanism is attached, and realizes gas shield welding welding function.
4) welding machine interior top section.Mainly be disposed with input filter plate 4, preceding control circuit board 41, control transformer 2, The components such as input filter common mode inductance 3, (master) control panel 7, driving plate 6.
5) welding machine interior underclad portion.Mainly it is disposed with two modules of IGBT(, four IGBT) 22 and its driving platelet (two Block), rectifier bridge 20, filter inductance 13, big electrolytic capacitor (two) 56 and its fixed plate 51, IGBT radiator 19, restore two fastly Pole pipe (three) and its resistance-capacitance protection plate (three pieces) 15, fast recovery diode radiator 16, cooling blower 33, saturation resonant inductance 12, resonant capacitance 11, inversion main transformer 9, output high current filter reactor 57, Hall current sensor 50, radiator The components such as fixed bracket 52.
In structure design aspect, as shown in Fig. 1, by intermediate bulkhead 8, the inside upper layer vulnerabilities scan part of welding machine It is separated with the forceful electric power circuit part of lower layer.Upper layer vulnerabilities scan part be equivalent to by intermediate bulkhead, shell, bottom plate, rear panel and The shell of front panel composition surrounds.Isolation lower layer's high current strong electromagnetic can be played, limit electromagnetic radiation, improve the source of welding current The effect of functional reliability.
6) control circuit board: the control circuit board of welding machine is designed as ten pieces, including preceding control circuit board or panel, driving Plate, IGBT driving platelet (two pieces), output fast recovery diode resistance-capacitance protection plate (three pieces), master board, input filter platelet, Output filtering platelet.Every piece of control panel has respective circuit part, carries different control functions.For example, two pieces of IGBT Driving platelet is welded respectively at the drive control end of two IGBT modules.In each IGBT module, there are two IGBT to manage.IGBT drives Being welded on dynamic platelet has voltage-stabiliser tube and resistance, and three blocks of output fast recovery diode resistance-capacitance protection plates are then mounted on corresponding fast In recovery diode module, in each fast recovery diode module, there are two fast recovery diodes.Export fast recovery diode resistance Hold to be welded on protection board and have capacitor and resistance, resistance and capacitor are concatenated.Every group of both ends for being connected in parallel on fast recovery diode, group At rc protection circuit, prevent fast recovery diode from damaging because of over-voltage breakdown;There are capacitor in primary placements on input filter platelet The devices such as C1~C3, protective tube F1 and capacitor C4.As shown in attached drawing 2,3, capacitor C1~C3 is connected to welding machine input filter inductance Anti- High-frequency Interference is played the role of in the rear end of L1 in circuit.Protective tube F1 is connected to control transformer TC1.Capacitor C4 connection To the rear end of rectifier bridge V1, the effect of anti-High-frequency Interference is also functioned in circuit.
As shown in attached drawing 4, design has a driving circuit and inversion pwm control circuit of IGBT in driving plate, and overheat and The parts such as overcurrent protection control circuit and temperature protection signal WD output, mainly complete the driving of IGBT switching tube, pwm pulse Produce and export control, and work such as overheat and overcurrent protection control.
It is attached it is shown in Fig. 4 be welding machine preceding control panel schematic diagram.As previously described, on the preceding control panel of welding machine Equipped with manual welding (containing carbon arc air gouging) and gas shield welding conversion keys and their indicator light;" inspection gas " key and its indicator light; " receive arc without " (the arc welding gun switch 2T operation mode) of gas shield welding, " receiving arc has " (arc welding gun switch 4T operation mode) and " initial stage has " select Select key and their indicator light;The welding wire material of gas shield welding, i.e. " medicine core ", " solid core " welding wire selection key and they Indicator light;Three kinds of gage of wire (1.0,1.2 and 1.6mm) selection keys and their indicator light;" initial stage ", " welding " The parameter setting or selection key in " receive arc " three welding process stages and their indicator light;Electric current and voltage code Device and adjusting knob;Power supply indicator, overheating indicator lamp and network pressure exception indicator light;" channel " number charactron of welding procedure is aobvious Show device, " channel selecting ", " storage ", " calling " selection key;The circuit parts such as electric current and voltage numeral method device.In Wei Chu Under the action of managing device control system, the electric current in attached drawing 4, voltage can be made to show that charactron is shown in advance according to the control requirement of setting It sets or the parameter when states such as actual welding.Make the channel digital pipe in attached drawing 4 according to the control requirement display welding journey of setting The number of sequence or specification.How to operate and use about these parts, content part in front has been carried out more Detailed description, which is not described herein again.The front control plate or panel circuit of welding machine drive using 8 Digital sum pipe of IC1, IC2 two panels Dynamic chip HD7279A, seven digital display tubes and aforementioned each indicator light and key etc. are core devices composition Control circuit.The control circuit links together with the microprocessor control circuit (see attached drawing 6) etc. in master board, utilizes master The complete control circuit system of welding machine of the circuits composition such as control panel microprocessor control, realizes the Digital Control side of welding machine Formula, the final every control function for realizing welding machine.
Attached drawing 5, attached drawing 6 and it is attached it is shown in Fig. 7 be welding machine master board part circuit diagram.Wherein, 5, attached drawing It point is the schematic diagram of power circuit part on welding machine master control borad.Attached drawing 6 is the microprocessor control circuit part in master board Schematic diagram.Attached drawing 7 is wire feed regulation and control in master board, the control of wire feed fast dynamic braking, electromagnetic gas valve QF control System, 36V heater circuit, arc welding gun switch and crawl wire feed button is anti-interference and state-detection control, electric current when gas shield welding are given Fixed, current detecting and negative-feedback and PI(proportional integration) control, given value of current, Current Negative Three-Point Capacitance when manual welding or carbon arc air gouging And PI(proportional integration) control, voltage when gas shield welding is given, voltage detecting and negative-feedback and PI(proportional integration) control, wire feed The schematic diagram for the circuit parts such as the electric current and voltage of machine are given and its detection controls.
The master board circuit system of welding machine uses the control circuit that MCU microprocessor forms for core.Many controls System uses the circuitry digitizing control mode of soft and hardware to realize.Circuit is not only simplified, properties of product and reliable are also improved Property.
The physical circuit principle of each circuit part of welding machine of the present invention and the components' placement on some circuit boards are shown in this patent Shown in the relevant drawings that specification provides.Between each circuit and components, circuit diagram relationship according to the invention is connected to Together.Finally under the action of control circuit, manual electric arc welding, the control of carbon arc air gouging and MIG/MAG gas shield welding are realized respectively It is required that.For example, control circuit through the invention, it is convenient to realize: 1) function of manual welding (containing carbon arc air gouging)/gas shield welding turns It changes;2) manual welding (containing carbon arc air gouging) output characteristics and state modulator;3) " inspection gas " control when MIG/MAG gas shield welding;In advance It supplies gas, lag time control of holding one's breath;Welding wire material (medicine core or solid core) selection control;Gage of wire (1.0,1.2 and 1.6mm) choosing Select control;" receive arc without " (the 2T mode) of gas shield welding, " receiving arc has " (4T mode) and " initial stage has " selection control;" initial stage ", " weldering Connect " and " receive arc " three welding process stages parameter setting or selection control and output characteristics, voltage and wire feed rate ginseng The controls such as number adjusting;3) under different welding methods, welding parameter or welding procedure (being indicated with different " channel " number) " channel selecting ", " storage ", " calling " control.
To control circuit board of the invention, circuit board is mainly installed and be welded on to electronic component by automatic mode On, thus the production process of circuit board is simplified, reduce manufacturing cost.Meanwhile welding machine production and processing process is reduced, system Make technique to be also simplified, more convenient production.Such design and processing technology, it is ensured that the production of product has very high Production efficiency, meanwhile, error rate and low manufacture cost, be conducive to improve the competitiveness of product in market.In addition, by adjusting few The components (such as inversion main transformer, output reactance device, IGBT model) of amount, can different size easy to form series produce Product.Such as product of 315A, 350A, 500A current class.
The working principle of welder circuit of the present invention is summarized as follows:
As illustrated in the accompanying drawings from 1 to 3.Input supply terminal is connected to three phase supply power supply.It is connect by the power switch 28 on welding machine rear panel Energization network source.The alternating current come from power grid is filtered by the filtering of input inductance 3 and capacitor C1 ~ C3 input filter circuit Wave.The main function of above-mentioned filter circuit is the interference for reducing electric network source to inverter welder circuit, and the work for improving welding machine can By property.Input power is controlled transformer 2 and powered by protective tube F1 to cooling blower 33, TC1.On the other hand, input power is given V1 three phase rectifier module 20 is powered.After rectification, it is filtered again using C4 capacitor.Supply voltage passes through V1 three phase rectifier module After 20 rectifications, become Rectified alternating current.Later, it is charged by filter inductance L2 to the big electrolytic capacitor of C5 ~ C6, voltage is gradually It increases, eventually becomes relatively stable+540V direct current.Filter inductance L2, C5 ~ C6 are big, and electrolytic capacitor plays the role of filtering.+ 540V direct current is supplied to be saturated by the IGBT module (having four IGBT pipes) of V2, V3, TR1 current detecting mutual inductor (200:1), L3 Resonant inductance 12, C9 resonant capacitance 11, TM1 inversion main transformer 9 and V4 ~ V6 fast recovery diode rectifier 15, L5 filtering The inverter main circuit of the compositions such as reactance 57, TA1 current detecting Hall sensor 50, arc voltage filter band.The function of inverter main circuit Or main function is :+540V high voltage direct current is converted to intermediate frequency (tens KHz) alternating current.TM1 contravariant transformer 9 realizes voltage The transformation of decompression and High-current output.Through V4 ~ V6 fast recovery diode rectifier rectification 15, TM1 contravariant transformer 9 is exported Medium frequency alternating current be transformed to direct current.It is unstable since its transformed current waveform is pulsation, it is unfavorable for welding process Stabilization be therefore filtered using L5 current filter reactor 57.In this way, the current waveform of OUT+ and OUT- output will It becomes stable.It help to obtain the weld seam of high quality.TR1 current detecting mutual inductor (200:1) is for the first of inversion main transformer Grade current detecting.TA1 current detecting Hall sensor 50 is used to detect the size of current of output, obtains current negative feedback signal, And during output characteristics control and parameter display control for participating in welding machine etc..
As shown in attached drawing 2,3, arc voltage filter band is connected to the output both ends of welding machine, by the circuit on the plate, obtains electricity During output characteristics control and parameter display control pressed negative-feedback signal, and participate in welding machine etc..In addition, seeing attached drawing 2,3 Output filter band components' placement figure shown in, be additionally provided in arc voltage filter band: 1) resistance R1 and R2.It is connected to welding machine output Positive and negative electrode both ends.These resistance are the dummy resistances of inverter type welder.It is negative by these when welding machine is without welding It carries, the floating voltage of welding machine can be set up.Since the resistance value of resistance is larger, the electric current by resistance is smaller.2) pressure-sensitive Resistance RV1~RV3.Varistor RV1 connects with capacitor C1, is connected in parallel on the positive and negative electrode both ends of welding machine output.Outlet side can be played Overvoltage protection, jamproof purpose.Varistor RV2~RV3 series connection, the neutral earthing rack the earth of connection.In addition Both ends are connected to the positive and negative electrode both ends of welding machine output, can play the role of overvoltage protection.3) C2 and C3 capacitor is connected, The neutral earthing rack the earth of connection.Other both ends are respectively connected to the positive and negative electrode both ends of welding machine, can play filtering, resist and do The effect disturbed.The setting of the above protection and interference protection measure, further ensures the reliability of welding machine control circuit work.
Referring to shown in attached drawing 2 and attached drawing 3, front panel or preceding control circuit board part are equipped with manual welding (containing carbon arc air gouging) With gas shield welding conversion keys and their indicator light;" inspection gas " key and its indicator light;" receive arc without " (welding gun of gas shield welding Switch 2T operation mode), " receive arc have " (arc welding gun switch 4T operation mode) and " initial stage has " selection key and their instruction Lamp;The welding wire material of gas shield welding, i.e. " medicine core ", " solid core " welding wire selection key and their indicator light;Three kinds of gage of wire (1.0,1.2 and 1.6mm) selection key and their indicator light;" initial stage ", " welding " and " receiving arc " three welding process ranks The parameter setting or selection key of section and their indicator light;Current encoded device and adjusting knob and voltage encoder and tune Save knob;Power supply indicator, overheating indicator lamp and network pressure exception indicator light;" channel " number code tube display of welding procedure, " channel selecting ", " storage ", " calling " selection key;The circuit parts such as electric current and voltage numeral method device.
As shown in the lower right in attached drawing 2,3, current regulation potentiometer on front panel or preceding control circuit board and Voltage adjusts potentiometer, is also connected to the master board circuit of welding machine.
Referring to shown in attached drawing 4, the front control plate of welding machine uses 8 Digital sum pipe driving chip HD7279A of two panels, above-mentioned each Indicator light and key are the control circuit of core composition.The control circuit in master board microprocessor control circuit (see Attached drawing 6) it links together, using master board microprocessor control circuit, realize the Digital Control mode of welding machine, it is final real Every control function of existing welding machine.
Attached drawing 5 is seen in driving plate part, and design has the driving circuit of IGBT, soft start control and inversion pwm control circuit, And it overheats and the parts such as overcurrent protection control circuit and temperature protection signal WD output, the mainly drive of completion IGBT switching tube Dynamic, soft start control, pwm pulse produce and export control, and overheat and overcurrent protection such as control at the work.
Drive control circuit part: it under the action of coming from master board GD- Setting signal, generates driving IGBT and switchs work Tetra- tunnel driving control signal of Zuo controls the switching state of IGBT according to control instruction.Change GD- Setting signal, Ji Kegai Become the pulse width of PWM chip output, the control of the final inversion for realizing welding machine and welding parameter.In attached drawing 5, TR1~TR2 is driven The dynamic devices such as transformer and Q1~Q8 field-effect tube, diode, resistance, capacitor, XS4 and J8 around them form inversion The driving circuit of V2~V3 IGBT in main circuit.The circuit form of tetra- road drive part of V2 ~ V3 IGBT Guan is substantially coincident 's.Due in attached drawing 5 UC3846 integrate PWM chip 11 feet and 14 foot output pwm signal driving powers it is small, therefore need by The driving circuit of IGBT carries out power amplification.After connecting with EC, GD with ED with EA, GB with EB, GC by its output GA, then go to control The on-off working condition of V2~V3 IGBT pipe processed.
Pwm control circuit part: the UC3846 in attached drawing 5 integrates the devices group such as PWM chip and surrounding resistance, capacitor At the inversion pwm control circuit of V2 ~ V3 IGBT pipe in attached drawing 2,3.UC3846 integrates 11 feet (output AOUT) of PWM chip It is two groups of PWM square-wave pulse signals with 14 feet (output BOUT) output control signal.The frequency of its square wave be it is fixed, have tens KHz.The resistance and capacitance parameter that it is connected by the chip determine.Two groups of square-wave pulse signals have in time one it is fixed when Between it is poor, in profession be also referred to as dead time.It is one of the important parameter for ensureing the alternation of two groups of switches of IGBT.The time is The peripheral components parameter setting determination of PWM chip is integrated by UC3846.As to how determining, UC3846 chip is checked Data used in connection with or explanation can be appreciated that.It is not repeated herein.
Soft start control section: as shown in attached drawing 5.The circuit of the part IC1B is voltage comparator.When welding machine is just connected When power supply ,+5V and+15V power supply are generated.Due to there is the presence of C5 electrolytic capacitor ,+15V power supply can be by resistance R7 to C5 It charges.When being just switched on power supply, the upper no voltage of C5, therefore, IC1B export high level, V4 diode current flow.It can make 16 feet shutdown control terminal (SHUTD) level of UC3846 is high level, and then 11,14 feet of UC3846 do not have pwm signal output. At this point, welding machine is also exported without floating voltage or electric current.With the progress of C5 charging process, the voltage on C5 is gradually increased.When When more than+5V voltage, IC1B exports low level, the cut-off of V4 diode.16 feet of UC3846 can be made to turn off control terminal (SHUTD) electricity It puts down as low level.Then, 11,14 feet of UC3846 allow to have pwm signal output.At this point, welding machine can also have floating voltage or Electric current output.The above control process is exactly the process that welding machine of the present invention realizes soft start control.
Overheating protection control section: see attached drawing 4.Overheat protector RBHQ is connected to driving plate circuit by plug.Overheat Protector RBHQ is closed type.It is mounted on the radiator of IGBT.See that attached drawing 4, overheat protector RBHQ are connected to operation On 3 feet and 10 feet of amplifier IC1, one end ground connection.The circuit of the part IC1A is voltage comparator.The circuit of the part IC1C is electricity Press follower.Since overheat protector RBHQ is closed type, when there is not superheating phenomenon, i.e. overheat protector RBHQ does not have When movement, the output signal WD of IC1C is low level, and the output of IC1A is also low level, and V3 diode is in off state. In the welding machine course of work, when superheating phenomenon occurs, the contact variation of overheat protector RBHQ movement, closed type is disconnection 's.At this point, the output of IC1A and IC1C becomes high level.V3 diode current flow turns off UC3846 pwm signal, stops output Pulse.In this way, the IGBT in inverter main circuit will also be closed, stop reversals.Welding machine is also just without output electric current.Therefore, Welding machine also can not just be welded again.Meanwhile microprocessor (STM8S208R8) control system in attached drawing 6 passes through and detects WD high level signal, learns superheating phenomenon occur.Later, under the control of control software, it can issue and stop wire feed, stop sending Gas lights the control actions such as overheating protection indicator light.When the radiator of IGBT is under the cooling effect of fan, after temperature reduces, Overheat protector RBHQ can restore closed state again.Later, in control circuit, the output signal WD of IC1C becomes low level, And the output of IC1A also becomes low level, V3 diode is in off state.UC3846 pwm signal is set to export PWM arteries and veins Punching.In this way, the IGBT in inverter main circuit can also start to carry out reversals.Welding machine can also have output electric current.Cause This, welding machine is just able to carry out and welds again.In attached drawing 6, microprocessor (STM8S208R8) control system passes through the WD detected Low level signal learns that superheating phenomenon is eliminated, extinguishes overheating protection indicator light.It later, can root under the control of control software Wire feed, the control actions such as supply gas are issued according to welding operational order.
Overcurrent protection control section: in attached drawing 4, the output TA and TB, V1 ~ V2 of TR1 current detecting mutual inductor (200:1) and V6 ~ V7, etc. devices form overcurrent protection control circuit.The primary current of over-current signal inversion main transformer in attached drawing 2,3 Detect the output TA and TB of mutual inductor TR1.TR1 current detector can detect the primary current letter of main transformer in inverter main circuit Number.Mainly check whether inverter main circuit occurs over-current phenomenon avoidance.Over-current signal after V1 ~ V2 and V6 ~ V7 such as rectify at the transformation, The output signal of generation is inspection stream signal.The output signal send the UC3846 control circuit part into attached drawing 4.If there is mistake Flow phenomenon, level can control the closing control terminal of UC3846, so that UC3846 is stopped output pwm control signal, that is, stop The output of inverter main circuit, to realize overcurrent protection control.
Master control circuit board part, schematic diagram is as shown in attached drawing 5, attached drawing 6 and attached drawing 7.Wherein, 5 part of attached drawing is weldering The schematic diagram of owner's control on board supply circuit part.Attached drawing 6 is the principle of the microprocessor control circuit part in master board Figure.Attached drawing 7 is wire feed regulation and control in master board, the control of wire feed fast dynamic braking, electromagnetic gas valve QF control, 36V Heater circuit, arc welding gun switch and crawl wire feed button is anti-interference and state-detection control, given value of current, electric current when gas shield welding Detection and negative-feedback and PI(proportional integration) control, given value of current, Current Negative Three-Point Capacitance and PI(ratio when manual welding or carbon arc air gouging Example integral) control, voltage when gas shield welding is given, voltage detecting and negative-feedback and PI(proportional integration) and control, the electricity of wire-feed motor Stream and voltage give and its detect the schematic diagram of the circuit parts such as control.
Wire feeder circuit part is shown in attached drawing 2, the lower section in 3 schematic block circuit diagrams and the top circuit part in attached drawing 7 It is shown.Current potential is adjusted including wire feeding motor MG1, electromagnetic gas valve QF, arc welding gun switch AN1, crawl wire feed button AN2, weldingvoltage Device RP4, welding current adjust components and the components such as potentiometer RP5.1~No. 6 control line of wire feeder circuit, by sending Control line socket below the control cable connection to welding machine front panel of silk machine, is actually connected with master board circuit It connects.
Power circuit part in master board, TC1 control several groups of power supplys of transformer secondary output output, are supplied respectively to lead Power unit in control panel.Double 18V power supplys are exchanged, by V2~V3, V/17~V18 diode rectification, then pass through N9 and N5 The voltage regulator circuit of the devices such as voltage-stablizer composition, generation+VA ,+VCC ,+15V, -15V direct current power source voltage supply corresponding control The live line works such as circuit;17V power supply is exchanged by V8~V11 diode rectification, then passes through the steady of the devices such as N14 voltage-stablizer composition Volt circuit generates one group of+15V direct current power source voltage, supplies the live line works such as corresponding control circuit;8V power supply is exchanged, is passed through V4~V7 diode rectification, then by the voltage regulator circuit of the devices composition such as N13 and N6 voltage-stablizer, respectively generation+5V ,+5V2 direct current Supply voltage supplies the live line works such as corresponding control circuit.
36V heater circuit part in master board, schematic diagram is as shown in 7 lower left part of attached drawing.From control The 36VAC power supply of transformer output stage, the input power as heater.By VR1 and VR2(self-recovery fuse), then connect It is connected to the heater power source socket 26 of welding machine rear panel part.By the socket, CO2 flowmeter is added when can be used for gas shield welding Hot part is heated, i.e., the drying process of moisture is removed to the CO2 protective gas from gas cylinder.
Electromagnetic gas valve QF control circuit part in master board, schematic diagram is as shown in 7 left middle section of attached drawing.It send 2 and No. 6 line traffic controls of silk machine circuit part gas shield welding when electromagnetic gas valve QF movement whether.Electromagnetic gas valve QF control circuit by Diode V35, V36, V37, RT3(self-recovery fuse), KD2 relay contact, inductance L4, capacitor C86 and electromagnetic gas valve QF Composition.The electromagnetic gas valve is located on the wire feeder used when gas shield welding.It can see from the schematic diagram, exchange double 27V power supplys, It is rectified by diode V36, V37, is transformed to direct current.When KD2 relay contact closure, electromagnetic gas valve QF can be made to act. When connecting external feeding pneumatic, there will be protective gas outflow in welding gun.The flow of gas is by adjusting flowmeter It is i.e. changeable, and be allowed to meet the protection requirement of welding.KD2 control relay circuit part, sees the right in attached drawing 6.KD2 after Electric appliance is controlled by 38 foot output levels of the microprocessor in attached drawing 6.When 38 feet export high level, triode Q6 is led Lead to, the KD2 actuating of relay, the relay contact KD2 closure in attached drawing 7 acts electromagnetic gas valve QF.Achieve that in this way to Welding section conveys protective gas.Conversely, when 38 feet of the microprocessor in attached drawing 6 export low level, triode Q6 cut-off, KD2 relay will not act.Relay contact KD2 is disconnected, and act electromagnetic gas valve QF will not.It is thus defeated without normal direction welding section Send protective gas.Whether the microprocessor control system in attached drawing 6 is pressed by detection " inspection gas " key, i.e., capable of emitting to electricity The action directive of magnetism valve QF completes " inspection gas " operation control;Whether arc welding gun switch when by detection gas shield welding is pressed, Microprocessor control system is under the action of controlling program, the capable of emitting action directive to electromagnetic gas valve QF, realizes that gas is protected The control requirement that the required preflow of weldering welding, lag are held one's breath." in advance " mentioned here and " lag " time, are opposite Determination when welding." in advance " it can be set with the time of " lag " and control system.
Wire feed regulation and control circuit in master board, schematic diagram is as shown in 7 upper-left portion of attached drawing.See attached drawing 2, 3, the wire-feeding control circuit part of welding machine.1 and No. 6 line in wire-feed motor circuit is connected to the both ends of wire feeding motor MG1.Work as wire feed When motor rotates, welding wire is driven to be transported to welding gun.In attached drawing 7, wire feed regulation and control circuit is by (on wire feeder) Wire feeding motor MG1, thyristor Q10, Q13 and Q8, optical controlled bidirectional thyrister N28, operational amplifier N15D, triode Q5, Q9, The components composition such as Q11~Q12 and Q15~Q17 and many resistance of their peripheries, capacitor.If thyristor Q10, Q13 Conducting, wire feed voltage can add to wire feeding motor, so that it may operate wire feeding motor.Thyristor Q10, Q13 are by trigger pulse Waveform control.Change the phase or pilot angle size of trigger pulse, so that it may change the voltage value for being input to wire feeding motor both ends The revolving speed of wire feeding motor also just can be changed in size, realizes adjusting or control to wire feed rate.Certainly, wire feed rate is controlled Potentiometer is given with receipts arc current in the initial stage on the given value of current potentiometer or preceding control panel on wire feeder or crawl is sent Silk speed preset size.Under different modes, the speed of wire feed rate is different.
Under the action of wire feed regulation and control circuit, 6 microprocessor control system circuit of attached drawing, for generating wire feed electricity The operating voltage of machine, the final stopping or velocity of rotation for controlling wire feeding motor MG1.The simple procedure of wire feed rate control and speed regulation It is described as follows: exchanging double 27V power supplys, wire-feed motor control electricity is supplied by RT4~RT7 as the power supply of control circuit for wire feeder Road, the main power source as thyristor Q10, Q13 speed-regulating control circuit.In N20-7(, that is, attached drawing 6 in attached drawing 7, micro process is come from 7 foot of device control system N20 digital-analog convertor) control signal be wire feed rate control signal.When there is certain N20-7 When controlling signal, by the rear class control circuit of N15D operation amplifier circuit, optical controlled bidirectional thyrister N28-B can be made to generate one The trigger pulse for determining pilot angle or the angle of flow, make thyristor Q10, Q13 in wire-feeding control circuit according to certain pilot angle or Angle of flow conducting, then, wire feeding motor MG1 obtains certain wire feed rate.When there is no N20-7 to control signal, wire feeding motor MG1 just stops operating.Change N20-7 and controls signal, i.e., changeable wire feed rate.In gas shield welding welding, change welding current It is given, the given value size just can be detected in the microprocessor control system in attached drawing 6.Pass through circuit control and N20 number- The conversion of analog converter, so that it may change N20-7 control signal.Electricity is welded in this way, being achieved that adjust wire feed rate or change Flow the purpose of size.When crawl wire feed controls, crawl wire feed key is also can be detected in the microprocessor control system in attached drawing 6 Closed state.Later, similar with above-mentioned control process, certain N20-7 control signal still can be generated, can be realized so a little Dynamic wire feed operation control.
Wire feed fast dynamic braking control circuit part in master board, schematic diagram are shown in 7 upper-left portion institute of attached drawing Show.Wire feed fast dynamic braking control circuit is by N32 optocoupler, triode Q18, field-effect tube Q14, resistance R175(0.5 Ω/8W) It is formed with R170~R174, capacitor C81 and C82 etc..When wire feed to be stopped, when closing N20-7 control signal, N32 Output stage N32-B in optocoupler can end or be not turned on.At this point, Q18 triode ends, field-effect tube Q14 conducting makes resistance R175(0.5 Ω/8W) both ends of wire feeding motor MG1 are parallel to, using the principle of resistance dynamic braking, fast implement wire feeding motor The braking of MG1, the size for preventing welding wire from stretching out welding gun head protection gas hood is too many, influences the normal operating of welding.And it prevents from welding Silk is inserted into molten bath at the end of welding, forms the bad phenomenons such as haircuts.
The electric current and voltage of wire-feed motor in master board are given and its detection control circuit part, schematic diagram are shown in attached drawing Shown in 7 upper right side part.By on wire feeder welding current RP5 and weldingvoltage RP4, operational amplifier N27A and N27B, The components such as N31A and N31B and resistance, capacitor, diode around them composition.Welding current RP5 on wire feeder Master board is connected to by the wire-feed motor control line plug interface of welding machine with weldingvoltage RP4 Setting signal.Part electricity The effect on road is: the welding current RP5 signal in wire-feed motor in the welding process, 1) being changed into electric current by circuit conversion Setting signal is input to 58 terminal of ATM of microprocessor control system in attached drawing 6, realizes the electric current to the wire-feed motor welding stage Control the sampling of Setting signal.2) the weldingvoltage RP4 signal in wire-feed motor is changed into the given letter of voltage by circuit conversion Number be input to 59 terminal of ATM of microprocessor control system in attached drawing 6, realize the voltage to the wire-feed motor welding stage control to Determine the sampling of signal.The electric current and voltage Setting signal that microprocessor control system obtains in attached drawing 6, on the one hand supply display is electric Road, the electric current and voltage in display welding machine preset welding stage give numerical value, on the other hand, can also pass through N18 and N20 number- The weldingvoltage that 7 feet of analog converter export the welding stage respectively gives Ug signal and welding current gives Ig signal.And it is attached When what 7 feet that microprocessor control system passes through N19 digital-analog convertor in Fig. 6 exported is then manual welding or carbon arc air gouging Welding current give Ig-MMA signal.Note: these above-mentioned Setting signals are one by different welding process institutes The Setting signal of corresponding control.And in the explicitly control stage, Setting signal is only explicitly.The supplementary explanation seen below:
The control Setting signal that microprocessor control system in master board is exported by digital-analog convertor, depends on The parameter setting in locating different welding process stages when welding machine output control.Microprocessor system welding operation before, It completes to sample the given value of these above-mentioned stage parameters.And the result of sampling is converted to digital quantity for corresponding number-mould Among conversion and control.For example, when manual electric arc welding or carbon arc air gouging, if it is in striking or starting the arc stage, that is, welding machine face Set initial stage on plate, then microprocessor control system can pass through the 7 of N19 digital-analog convertor first in attached drawing 6 Foot exports corresponding initial stage or the welding current in striking stage gives Ig-MMA signal.The Setting signal size is by welding machine control plane On plate, determined according to the welding current parameter of initial stage or striking phase sets.Later, into the welding stage, at this point, micro process The welding current that device control system can export the corresponding welding stage by 7 feet of N19 digital-analog convertor gives Ig-MMA letter Number, which is also by being determined on welding machine control panel according to the welding current parameter of welding phase sets.Class As, microprocessor control system can export respectively initial stage, welding and receipts by 7 feet of N18 and N20 digital-analog convertor The weldingvoltage in arc stage gives Ug signal and welding current gives Ig signal.In short, microprocessor control system passes through number- The Setting signal of analog converter output, depending on different phase Control Welding Process and the corresponding welding process stage it is each Parameter setting.These output parameter Setting signal, be participate in different phase welding current or negative voltage feedback control it is important Determinant.
Arc welding gun switch and crawl wire feed button in master board be anti-interference and state-detection control circuit part, principle Figure is as shown in 7 lower left part of attached drawing.By crawl wire feed key AN2, arc welding gun switch AN1, operational amplifier N21A and N21B, with And some devices composition of their peripheries.Two operational amplifier devices form voltage comparator.No. 3 lines in wire-feed motor circuit, That is RA interface signal represents the signal whether crawl wire feed key AN2 and arc welding gun switch AN1 press.ATM 37 and ATM 33 It is respectively connected in the microprocessor control system circuit in attached drawing 6.By detection, that is, may know that is microprocessor control system It is no to press crawl wire feed key AN2 or arc welding gun switch AN1.If it is crawl wire feed key is pressed, then as previously described, Control circuit can make wire feeder carry out wire feed control.Crawl wire feed is used to install welding wire, or conveys welding wire.If it is detection It is closed to arc welding gun switch, then control circuit can be such that electromagnetic gas valve acts, and convey protective gas to welding section first, then make wire feed Mechanism carries out wire feed control, and control circuit generates GD- and gives pwm signal, welding machine output no-load voltage.Once welding wire connects with workpiece Touching, then electric arc is ignited.The control process in later period, with gas shield welding setting receipts arc have, receive arc without etc. have direct relationship.Example Such as, illustrated with having initial stage, welding and receiving the example of arc process setting, welding process first carries out the weldering at initial stage or striking stage Connect parameter (electric current or wire feed rate, voltage) control.Later, into the welding parameter control in welding stage.Finally, then according to weldering After rifle switch disconnects, into the welding parameter control for receiving the arc stage.At the end of welding, there are also the lag time phases of protective gas Control.In the partial circuit of attached drawing 7, inductance L3, capacitor C83 and C84 are to improve welding machine anti-interference ability and be arranged, Prevent extraneous interference signal from having adverse effect on to control circuit.
When selecting gas shielded welding method, under the action of 35 N20-7 and ATM of system control signal, multichannel electronic control switch What 12 and 14 feet of N2 were to turn on, that is, it is in feedback control under the state of a control of gas shield welding.
Voltage when gas shield welding in master board is given, voltage detecting and negative-feedback and PI(proportional integration) control circuit Part, schematic diagram is as shown in 7 lower right part of attached drawing.In attached drawing 2,3, arc voltage filter band is connected to the positive polarity of welding machine output Between end, negative polarity end.Its voltage sampling signal exported is connected to master board.In fig. 7, voltage sampling signal is connected to The part inductance L1.N29B operation amplifier circuit part is voltage follower.N29A operation amplifier circuit part is then integral Circuit.N25, N17 are optocoupler, not only act as the effect of electrical isolation, and there are also certain other control actions.For example, working as welding machine Output voltage, puncture voltage-stabiliser tube ZD6, light emitting diode N25-A in N25 made to shine, then, three pole of output stage in N25 Pipe N25-B conducting.N24 is linear optical coupling HCNR200.Using the optocoupler, it can not only make the output high tension loop and control of welding machine Low-voltage circuit carries out electrical isolation, can also ensure that the transmission of signal has the preferable linearity.Namely in N22D operation amplifier The input terminal of device circuit part has preferable, the voltage detecting feedback signal proportional to welding machine output voltage.N22D operation is put The signal of big device circuit output, is divided into two-way.First is that sending the reality of the microprocessor control system ATM 60 into attached drawing 6 by R127 When voltage signal sampling terminal.Microprocessor control system obtain real-time voltage signal for actual welding voltage display and The control of other circuits.It in addition is sent by R85 to the non-inverting input terminal of the N22A voltage follower formed all the way.N22A voltage The signal of follower output, the Uf signal of weldingvoltage negative feedback control when to participate in gas shield welding welding.And participate in gas shield welding weldering The Ug Setting signal of weldingvoltage negative feedback control when connecing, then from microprocessor control system N18 digital-to-analog in attached drawing 6 7 feet of converter export.It, which represents initial stage, welding and receives the weldingvoltage in arc stage, gives Ug signal.What is actually Voltage Setting signal, Control Welding Process and the voltage parameter in corresponding each welding process stage depending on different phase are set It is fixed.These voltage parameter Setting signals are the important determinants for participating in different phase welding current or negative voltage feedback control. For ease of description, being referred to as with the given Ug signal of weldingvoltage.The signal is put by the operation that resistance R56 is connected to N11A composition The inverting input terminal of big device circuit.The signal of N11A operation amplifier circuit output, then exported by resistance R46, and be added in R85 Negative voltage feedback control Uf signal polarity be it is opposite, the two with parallel connection superposition form be delivered to N3D gas shield welding voltage The PI link of negative feedback control.By the PI controlling unit, realize that the floating to welding output voltage accurately controls.Attached drawing 7 In, N23-8 is connected to left side N23(MAX5436B, digital potentiometer in attached drawing 6) 8 feet;N23-9 is connected to the left side in attached drawing 6 9 feet of N23 digital potentiometer.KD1 relay contact in attached drawing 7, then the relay KD1 being controlled by attached drawing 6.And KD1 after The movement of electric appliance and the access way of N23 digital potentiometer, then select depending on the diameter of different welding wires.Select diameter 1.0mm welding wire, KD1 movement;The welding wire of diameter 1.2 and 1.6mm is selected, KD1 is failure to actuate.By the opening of KD1 relay contact, Closed state and the access way of N23 digital potentiometer change, and the parameter of PI controlling unit, the final output for changing welding machine can be changed Characteristic.Finally welding machine is made to have good welding adaptability when welding under different gage of wire, and ensures the quality of weld seam.
Given value of current, current detecting and negative-feedback and PI(proportional integration when gas shield welding in master board) control circuit Part, schematic diagram is as shown in 7 right-hand component of attached drawing.The Current Negative Three-Point Capacitance of Hall sensor from welding terminal detects letter Number, after the processing of circuit of rear class N22C operational amplifier composition, it is divided into several branches.
It is wherein the real-time current signal sampling that the microprocessor control system ATM 61 into attached drawing 6 is sent by R109 all the way Terminal.The real-time current signal that microprocessor control system obtains is for the display of actual welding electric current and the control of other circuits System.
It in addition is sent by R60 to the non-inverting input terminal of the operational amplifier N12A voltage follower circuit formed all the way. In attached drawing 7, N1-B is the output stage triode of optocoupler, inputs the middle upper part of level led N1-A in figure 6.Its Control is: after the completion of welding process, unclamping arc welding gun switch, the level led N1-A of the input of the optocoupler shines, output stage Triode N1-B conducting.R32 resistance is set to be connected to low level.In this way, can be to gas shield welding when N3B operational amplifier partial circuit group At output electric current PI feedback control link generate control influence.
It in addition is sent by R61 to the inverting input terminal of operational amplifier N15B all the way.Operational amplifier N15B and its week The circuit of component composition is enclosed, effect is to realize short-circuit protection.It is well known that the output of the source of welding current is flat when gas shield welding Characteristic, when output short-circuit, electric current is very big.If short circuit for a long time, certainly will will cause serious problem, because This, it is necessary to take the measure of short-circuit protection.Its control process is: being more than several to a few tens of milliseconds grade when short circuit for a long time occurs Other short circuit duration, such as short circuit in 0.5 second, at this point, the output short circuit current of welding machine is very big.Up to several hundred amperes.Welding machine output The signal of Hall current sensor output in circuit is very big, that is, the signal for being input to R61 is very big, then N15B operational amplifier Low level is exported, diode V14 is connected, " GD- is given " control signal is dragged down by R20.Due to " GD- is given " control signal Level is low, and therefore, the pwm pulse of the UC3846 output in attached drawing 4 is near closing.In this way, it is prevented that high current long-time Short circuit causes the problem of equipment fault.In attached drawing 7, N23 is the output stage triode of optocoupler, is inputted level led attached Middle upper part in Fig. 6.When control system is powered, when having+5V voltage, the input stage lumination of light emitting diode of N23 optocoupler is defeated Grade triode ON out.So that R79A resistance is connected to low level, plays the role of partial pressure.
It in addition is sent by R108 to the non-inverting input terminal of the operational amplifier N22B voltage comparator circuit formed all the way. In attached drawing 7, N17-B is the output stage triode of optocoupler, and input stage is light emitting diode N17A.When welding machine does not export electric current When, the current detection signal of R108 is input to almost without then, N22B exports low level.The input stage of N17 optocoupler luminous two Pole pipe N17A shines, output stage triode N17-B conducting.To in attached drawing 7 N3D gas shield welding voltage PI controlling unit it is defeated Side has an impact out.
When selecting manual soldering method, under the action of 35 N20-7 and ATM of system control signal, multichannel electronic control switch What 13 and 14 feet of N2 were to turn on, that is, it is in feedback control under the Current Negative Three-Point Capacitance PI control of manual welding.
Given value of current, Current Negative Three-Point Capacitance and PI(proportional integration when manual welding or carbon arc air gouging in master board) control Circuit part, schematic diagram is as shown in 7 right-hand component of attached drawing.The Current Negative Three-Point Capacitance of Hall sensor from welding terminal is examined Signal is surveyed, after the processing of circuit of rear class N22C operational amplifier composition, is divided into several branches.It is wherein to be sent by R35 all the way To the rp input signal end of operational amplifier N3A, current control is exported when as the branch manual electric arc welding or carbon arc air gouging Current negative feedback signal If.The given value of current signal Ig-MMA that current control is exported when manual electric arc welding or carbon arc air gouging comes from Microprocessor control system, that is, the electric current in correspondence welding stage that is exported by 7 feet of N19 digital-analog convertor to Determine signal.The Setting signal size is by joining on welding machine control panel according to the electric current of initial stage or striking and welding phase sets What number determined.If initial stage or striking stage, then be initial stage or striking stage to constant current participate in welding machine manual electric arc welding or Output current control when carbon arc air gouging;If welding the stage, then be the welding stage give constant current participate in welding machine manual arc Output current control when weldering or carbon arc air gouging.The given value of current signal of N19-7 foot output is connected to N11B operational amplifier composition The input terminal of voltage follower circuit is input to the in-phase input signals for 1 end of operational amplifier N3A later.N3A and its periphery Device exports the PI(proportional+integral of current control when forming manual electric arc welding or carbon arc air gouging) operational amplifier.At this point, the PI The signal of control output is the signal of the both ends R19 output, that is, " GD- is given " control signal in attached drawing 4.It decides attached The pwm pulse width of UC3846 in Fig. 4 finally decides the welding current size of welding machine output.
It should be further noted that: already mentioned above, the pwm pulse width modulated letter that UC3846 is exported in attached drawing 4 The signal of output size of current when number being the output voltage and manual welding when determining welding machine inverter main circuit gas shield welding.Its arteries and veins It rushes width to depend on: 1) when manual welding (state of a control), by the given value of current in different phase (such as initial stage or striking, welding stage) Signal and output current negative feedback signal etc. codetermine.The object or target of control are the output in the different welding stages of welding machine Size of current.When unloaded, negative-feedback signal very little.Control circuit generates a biggish pwm pulse signal of duty ratio, makes inversion Four IGBT in main circuit are in alternating conductive state, finally make inverter main circuit output no-load voltage.When operator is adjusted When giving constant current (such as initial stage or striking electric current, welding current) well, and being welded, control circuit passes through the electricity in attached drawing 2,3 Stream detection Hall sensor detects the current negative feedback signal of welding machine output.In fig. 7, current negative feedback signal and electric current Setting signal is compared.After the manual welding PI control in attached drawing 7, generate corresponding " GD- given " signal, can transport to GD- in attached drawing 4 gives terminal.Its result controls the pulse width or duty ratio of UC3846 PWM chip in welding machine attached drawing 4, certainly The size for determining welding machine output electric current, realizes accurately controlling for output current parameters.And make outside the output characteristics constant current band of welding machine The dropping characteristic dragged.It further says, when welding current Setting signal is constant, as the current negative feedback signal detected increases Add, and after reaching given setting value, the difference of welding current Setting signal and current feedback control signal can be with electric current Increase and reduce, after control, makes the pulse width or duty ratio reduction that UC3846 PWM is exported in welding machine attached drawing 4, welding machine Output voltage reduce.This process, that is, the control of so-called Current cut-off negative feedback.I.e. only when electric current reaches welding electricity Flow the feedback control just to work after the setting value of potentiometer.Hereafter, the increase small with electric current, voltage reduces can be very much. When voltage drops to 16V or less, with the reduction of voltage, control circuit can make welding machine according to setting push current size The pulse width or duty ratio of UC3846 PWM chip output are increase accordingly, and make welding current according to the push current parameter of setting Increase, that is, generate push current, ultimately forms the dropping characteristic dragged outside constant current band.When welding current Setting signal changes When, Current cut-off negative feedback setting value is different, but other control processes are similar.In this way, in the minimum of potentiometer setting Between maximum, so that it may obtain without several negative characteristic curves.Such control, and meet the basic of manual electric arc welding welding It is required that.2) when carbon arc air gouging (state of a control), control process and method, be with manual welding control process described above 's.3) when gas shield welding state of a control, the voltage of welding machine output is by different phase (such as initial stage or striking, welding, receipts arc stage) Weldingvoltage Setting signal and output voltage feedback signal etc. codetermine.It is similar with manual welding or argon arc welding control when unloaded, It is still UC3846 pwm pulse width signal in the biggish attached drawing 4 of output, obtains floating voltage.After bringing onto load, then with craft The control of weldering is different.When gas shield welding, the output characteristics control of welding machine is flat characteristic, rather than the decline dragged outside constant current band is special Property.Its main feature is that: load current changes greatly, and output voltage varies less, and keeps relative stability.Only when the given letter of voltage When number changing, the voltage of output just will appear large change.Electric current, voltage when about gas shield welding, the control such as supply gas, Part before, which has had, to be described in further detail, and just it is no longer repeated here.
About under-voltage (containing phase shortage) of the invention and overvoltage protection.Attached drawing 8 is in the main control circuit of welding machine of the present invention Under-voltage (containing phase shortage) and over-voltage detection protection circuit.Circuit is mainly by operational amplifier N8A, N7B, N8B, field-effect tube Q3, light The composition such as coupling N10, program-controlled pipe U4.Program-controlled pipe U4 and its peripheral components form voltage regulator circuit, and the voltage at the both ends C25 obtained is made For the operating voltage of operational amplifier.The circuit of three parts operational amplifier N8A, N7B, N8B is all voltage comparator.DC+ With the output DC bus-bar voltage of DC- rectifier bridge V1 in attached drawing 2,3.When the supply voltage of welding machine is too low, excessively high or power supply When power phase shortage, finally the voltage between DC+ and DC- can all be had an impact.When too low, the excessively high or power supply phase shortage of appearance When any situation, field-effect tube Q3 can be made to be connected.The output stage triode ON of optocoupler N10, makes the micro process in attached drawing 6 Device control system can detect low level under-voltage (containing phase shortage) or overvoltage protection signal, finally issue control instruction, close The control actions such as the PWM output of welding machine are closed, and light network pressure exception indicator light, display failure occurs.After troubleshooting, field effect It should pipe Q3 cut-off.The output stage triode of optocoupler N10 is not turned on, and the microprocessor control system in attached drawing 6 detects high level Under-voltage (contain phase shortage) or overvoltage protection signal, finally issue control instruction, can make to generate the controls such as the PWM output of welding machine dynamic Make, and extinguishes network pressure exception indicator light.
It is the brief control process explanation of each control circuit part of the invention and three kinds of welding methods above.Because illustrating circuit Principle is more complicated.The above content only provides some main control processes and result.But since the present invention has given in detail Therefore circuit diagram for having for the people of circuit reading ability (or having interlock circuit knowledge), can be understood. Because circuit diagram is also a kind of noiseless language.But for the people for not having circuit reading ability (or not having interlock circuit knowledge) For, even if this specification explanation is more again, they are also elusive.In view of the relationship of length, patent specification is only Main part can be illustrated, so that patent specification reader better understood when relevant working principle and process.
By above description as it can be seen that the present invention has oneself unique mentality of designing and method.It can not only realize the three of welding machine The controls such as kind welding method output, moreover, the structure of designed control circuit and welding machine designs, it is all to produce welding machine of the present invention Where the basic reason for technical advantages that product have that control performance is good, machine structure is compact etc., and to meet product efficiently and low Cost production, high reliability, the important leverage of manufacturing process technology advance.The content of present patent application protection is that Protect the structure and circuit design of this welding machine.
The above content is combine specific source of welding current structure and circuit board and control function made for the present invention in detail Illustrate, and it cannot be said that specific implementation of the invention is only limited to these explanations.To the other technologies people of technical field of the present invention For member, without departing from the inventive concept of the premise, several other deductions and transformation can also be made, these should all be regarded To belong to the scope that the present invention protects.

Claims (5)

1. a kind of inversion multifunctional welding machine, including casing part, rear panel part, front-facing portion and inside circuit part, It is characterized by: front panel be equipped with manual welding, gas shield welding, inspection gas, receive arc without, receive arc has, initial stage has, medicine core and solid core weldering Silk, three kinds of gage of wire, initial stage, welding, the selection key and its their indicator light for receiving arc;Electric current, voltage adjust encoder; Power supply, overheat and network pressure exception indicator light;Channel number, electric current and the voltage of welding procedure are shown;Selection, is called at storage in channel Key part;
The internal circuit part is upper and lower layered structure, and upper layer is vulnerabilities scan part, and lower layer is forceful electric power circuit part, intermediate The inside upper layer vulnerabilities scan part of welding machine and the forceful electric power circuit part of lower layer are separated by partition, at the middle and upper levels vulnerabilities scan Part is equivalent to the shell formed by partition, shell, rear panel and front panel and surrounds;
The vulnerabilities scan part on upper layer includes arc voltage filter band, preceding control circuit board, control transformer, input filter common mode electricity Sense, master board and driving plate;
Underclad portion includes IGBT and its driving platelet, rectifier bridge, filter inductance, big electrolytic capacitor and its fixed plate, fast recovery Diode and its resistance-capacitance protection plate, saturation resonant inductance, resonant capacitance, inversion main transformer, output high current filter reactor And Hall current sensor.
2. a kind of inversion multifunctional welding machine as described in claim 1, it is characterised in that: be provided with IGBT in the driving plate Driving circuit and inversion pwm control circuit, and overheat and overcurrent protection control circuit and the output section temperature protection signal WD Point, the driving of IGBT switching tube is completed, pwm pulse produces and exports control, and overheat and overcurrent protection control;Driving plate Under the action of master board Setting signal, four tunnel driving control signal of driving IGBT switch work are generated, are referred to according to control It enables, controls the switching state of IGBT;Change master board Setting signal, i.e., the pulse width of changeable PWM chip output is real The inversion of existing welding machine and the control of welding parameter.
3. a kind of inversion multifunctional welding machine as described in claim 1, it is characterised in that: the arc voltage filter band is connected to weldering The output both ends of machine obtain negative voltage feedback signal by the circuit on the plate, and participate in welding machine output characteristics control and Parameter display control.
4. a kind of inversion multifunctional welding machine as described in claim 1, it is characterised in that: the preceding control circuit board part, Equipped with manual welding and gas shield welding conversion keys and their indicator light;" inspection gas " key and its indicator light;The receipts arc of gas shield welding Nothing, receipts arc have and have selection key and their indicator light with initial stage;The welding wire material selection key of gas shield welding and they Indicator light;Three kinds of gage of wire selection keys and their indicator light;Initial stage, welding and receipts three welding process ranks of arc The parameter setting or selection key of section and their indicator light;Current encoded device and adjusting knob and voltage encoder and tune Save knob;Power supply indicator, overheating indicator lamp and network pressure exception indicator light;The channel number numeral method device of welding procedure leads to Road selection, calls selection key at storage;Electric current and voltage numeral method device.
5. a kind of structure of inversion multifunctional welding machine as described in claim 1, it is characterised in that: the control transformer Several groups of power supplys of grade output, the power unit being supplied respectively in master board exchange double 18V power supplys, by diode rectification, then The voltage regulator circuit being made up of voltage-stablizer, generation+VA ,+VCC ,+15V, -15V direct current power source voltage supply corresponding control electricity The live line works such as road;17V power supply is exchanged by diode rectification, then by the voltage regulator circuit of the devices such as voltage-stablizer composition, is generated One group of+15V direct current power source voltage supplies corresponding control circuit live line work;8V power supply is exchanged, by diode rectification, then The voltage regulator circuit being made up of regulator device, generation+5V ,+5V2 direct current power source voltage, supply corresponding control circuit respectively Live line work.
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