CN200970664Y - Automatic wire feeder for TIG welding - Google Patents

Abstract

TIG automatic welding wire feeding device sends entire sets of standard ER50-6 wire (weight 20 kg) to the welding orifice of the welded wokingpieces, and finally realizes semi-automatic TIG welding. The device includes a main control panel, a wire feeding motor, a TIG automatic wire-feeding welding gun, a front control panel, a rear control panel and a shell. This device is safe, convenient, simple and efficient, is a practical way of utility model TIG welding.

Description

TIG welding automatic feeding device

Technical field

The utility model relates to a kind of TIG welder; Relate in particular to a kind of TIG welding automatic feeding device.

Background technology

Along with the manufacturing capacity of industries such as food machinery, pharmaceutical machine, pressure vessel improves constantly, the engineering of being accepted is increasing, requires technological level more and more higher, and the manufacturing cycle requires shorter and shorter, and these new requirements all be unable to do without the raising of Automation of Welding.As everyone knows, materials such as soldering stainless steel, steel alloy account for sizable ratio in these industries, and must be with argon arc TIG welding when soldering stainless steel, steel alloy, past, operating personnel in welding process wanted the right hand to hold welding gun, left hand is taken welding wire, and the headband weld cap is put in order dish because welding wire is a standard, so must be cut into pieces welding wire during welding, be convenient to operating personnel well and use.The workman just must constantly stop and gets welding wire when big workload like this, and this is not only influential but also operating efficiency is not high yet to welding quality.When the welding job amount is very big, arrange several even tens working faces weld simultaneously, the phase that works together mutual interference brings inconvenience for construction and check.

Summary of the invention

The purpose of this utility model just provides a kind of safe, convenient, simple, efficient, practical new type auto wire feeder; It is inconvenient in use to have solved existing argon-arc welder, the technical deficiency of bad operation.

For realizing that the technical scheme that the utility model purpose is taked is:

This device comprises: main control board, wire feeding motor, TIG weldering automatic feeding welding gun, the control front panel, control rear board and shell, it is characterized in that: control rear board negative input links to each other with the cathode output end of argon-arc welder, and the control end of rear board is connected with argon arc welding machine control joint, and the inlet suction port of rear board is connected with the air outlet adapter of argon-arc welder; Power line is connected to the 220V AC power, the cathode output end of control front panel is connected with the cable connector of TIG automatic feeding welding gun, the wire feed joint links to each other with the wire convey soft pipe of welding gun, and air outlet adapter links to each other with the air inlet pipe of welding gun, and the rifle combined socket and switch links to each other with the rifle on-off plug of welding gun.

The control front panel is provided with power switch, power supply indicator, wire feed rate regulator potentiometer, fast wire feed knob, self-locking/non-self-locking change-over switch, wire feed starting time-delay regulator potentiometer.After described automatic feeding device and argon-arc welder and TIG automatic feeding welding gun connected, hand-holdable welding gun directly carried out welding operation; Described device master control circuit board comprises: lower pressure rectifier filtering voltage regulation and power supply circuits, sequence circuit, silk fast given control circuit, motor driving controling circuit and braking circuit.

Described voltage commutation filtering voltage regulation and power supply circuits comprise: the rectification circuit that diode D20～D23 forms, the filter circuit that capacitor C 20～C25 forms, the power supply circuits that power module of voltage regulation LM7815, power module of voltage regulation LM7915, diode D24, diode D25, capacitor C 26～C29, resistance R 10, resistance R 11 are formed.

Described rifle switch is received not gate U5C input after the resistance R 16 of parallel connection and the equal ground connection of the other end, capacitor C 3, after the resistance R 17 of reversal connection diode D4 in the parallel connection of not gate U5C output termination, meet not gate U5D, connect the capacitor C 4 of an other end ground connection between diode D4, the resistance R 17 NAND gate U5E; The output of not gate U5D is received the D end of trigger U4B;

A tongue tube is through the resistance R 18 of parallel connection and the equal ground connection of the other end, the input that capacitor C 5 is received not gate U5E, after the resistance R 19 of reversal connection diode D5 in the parallel connection of not gate U5E output termination, meet not gate U5F, the capacitor C 6 that is connected to other end ground connection between diode D5, the resistance R 19 NAND gate U5F, and the output of not gate U5F is received the CLK end of trigger U4B;

Self-locking/non-self-lock switch via the resistance R 22, resistance R 20 of series connection with or a door U8A link to each other, connect capacitor C 9, the capacitor C 8 of an other end ground connection respectively at the two ends of resistance R 22;

The output of not gate U5D is connected to the input of not gate U6A or door U8A, the CLK end of trigger U4A in proper order, or the output of door U8A connects the R end of the input of trigger U4, the input of the output termination of not gate U6A and door U7A;

One end of the output of the output termination of not gate U5D or door U8B, inferior end links to each other with the rifle thread switching control, or the other end of door U8B is connected with the output Q end of trigger U4B; Be connected with the output Q end of trigger U4A with another input of door U7A, link to each other with receipts arc control line simultaneously; Or door U8B output links to each other through the relay J 1 of resistance R 21 and welding machine control, connects the capacitor C 7 of an other end ground connection between relay J 1 and the resistance R 21; Resistance R 21 with or door be connected the control line of fast wire feed enabling signal ZS between the U8B.

The fast given circuit of described silk comprises: "+" that the fast adjuster of silk is received operational amplifier U1A through resistance R 1, capacitor C 1, resistance R 2 holds the output termination electronic switch U2 of operational amplifier U1A; Electronic switch U2 output X terminates to "+" end of operational amplifier U1B, operational amplifier U1B output series resistor R5, "+" that be connected to the amplifier of being made up of operational amplifier U1C, resistance R 6, potentiometer W1 through resistance R 5 holds, and operational amplifier U1C output is received "+" end of the adder of being made up of resistance R 8, resistance R 7, operational amplifier U1D through resistance R 9; Silk velocity modulation nodal potential device other end ground connection, resistance R 11 is with potentiometer W2 and be connected to "+" end of operational amplifier U3A after connecing, "+" that operational amplifier U3A output is also received adder through resistance R 10 holds, and adder is exported to the fast given voltage end of silk through the diode D1 of resistance R 12, reversal connection ground connection.

Described wire-feeding control circuit and braking circuit comprise: it all is diode D12, diode D13 and diode D7, the diode D8 that is just connecing that the two 27V power inputs of interchange connect respectively; Diode D12, diode D13 be series resistance R30, resistance R 29 respectively, and the negative pole of diode D12 links to each other with the negative pole of diode D13; "-" end of resistance R 29 and the input of receiving the comparator of forming by resistance R 32, resistance R 33, resistance R 31, operational amplifier U3B after voltage-stabiliser tube DW1 is in parallel; The output of comparator connects diode D14, diode D14 series resistance R34, receive the base stage of triode T3 after the resistance R 35 of resistance R 34 ground connection in parallel, the colelctor electrode of triode T3 is received the input of programmable unijunction transistor T9 through resistance R 46, capacitor C 15;

After the resistance R 36 and C12 of wire-feed motor feedback voltage through serial connection back ground connection, resistance R 38 dividing potential drops by resistance R 37, ground connection, diode D15, the resistance R 39 of reversal connection, the voltage-stabiliser tube DW3 of reversal connection then connect, through connecing capacitor C in parallel 13 and resistance R 40, resistance R 41 behind the voltage-stabiliser tube DW3, voltage-stabiliser tube DW3 also receives the base stage of triode T4, and the emitter stage of triode T4 connects given electricity end through resistance R 42; The colelctor electrode process resistance R 43 of triode T4 is received the input of the operational amplification circuit of being made up of resistance R 44, triode T5, triode T6, triode T7, triode T8, and the output of operational amplification circuit is also received the input of programmable unijunction transistor T9 through resistance R 45;

Programmable unijunction transistor T9 and resistance R 47, resistance R 48, resistance R 49 are formed controller, and the output of programmable unijunction transistor T9 is the output of controller; Pass through not gate U6C, not gate U6D, link to each other with the trigger electrode of controllable silicon T1 with door U7C, driver U10, resistance R 25, diode D9, the negative pole of controllable silicon T1 links to each other with wire-feed motor feedback voltage positive terminal through resistance R 27;

Connect the positive pole of controllable silicon T1 after diode D7, the diode D8 parallel connection, parallel resistance R23 after the negative pole of diode D7, diode D8 links to each other, resistance R 23 other end ground connection;

The brake signal end with or the door U8C input link to each other, or the output termination not gate U6B input of door U8C, the output termination of not gate U6B and door U7B, receive the control utmost point of braking metal-oxide-semiconductor T2 with the output of door U7B through diode D10, resistance R 28, metal-oxide-semiconductor T2 is connected with wire-feed motor feedback voltage positive terminal again.

The beneficial effects of the utility model are: the utility model can be delivered to the whole dish ER50-6 welding wire (weight 20kg) of standard on the weld bond of welding work pieces by this device, finally realizes the semi-automation of TIG welding; Safety, convenient, simple, efficient is a kind of novel TIG welding manner of practicality, is easy to promote.

Description of drawings

Schematic diagram when Fig. 1 is the utility model duty.

Fig. 2 is this device front panel schematic diagram.

Fig. 3 is this device rear board schematic diagram.

Fig. 4 is a circuit block diagram.

Fig. 5 is lower pressure rectifier filtering voltage regulation and power supply circuit figure.

Fig. 6 is sequence circuit figure.

Fig. 7 is the fast given control circuit figure of silk.

Fig. 8 is wire-feeding control circuit and braking circuit figure.

Fig. 9 is integrated circuit figure.

Label 1-control rear board negative input wherein; 1 '-cathode output end of argon-arc welder; The control end of 2-rear board; 2 '-argon arc welding machine control joint; 3-rear board inlet suction port; 3 '-air outlet adapter of argon-arc welder; 4-power line; 5-control front panel cathode output end; 6-wire feed joint; 7-air outlet adapter; 8-rifle combined socket and switch; 9-argon-arc welder; 10-TIG welding automatic feeding device; 11-TIG automatic feeding welding gun; 12-front panel power switch; 13-power supply indicator; 14-wire feed rate regulator potentiometer; 15-fast wire feed knob; 16-self-locking/non-self-locking change-over switch; 17-wire feed starting time-delay regulator potentiometer; 23-rear board power safety; 25-rear board control socket.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

As shown in Figure 1, this device comprises: main control board, wire feeding motor, TIG weldering automatic feeding welding gun, the control front panel, control rear board and shell, the cathode output end 1 of control rear board negative input 1 and argon-arc welder ' link to each other, the control end 2 of rear board and argon arc welding machine control joint 2 ' be connected, rear board inlet suction port 3 and argon-arc welder air outlet adapter 3 ' be connected; Power line 4 is connected to the 220V AC power, the cathode output end 5 of control front panel is connected with the cable connector of TIG automatic feeding welding gun, wire feed joint 6 links to each other with the wire convey soft pipe of welding gun, and air outlet adapter 7 links to each other with the air inlet pipe of welding gun, and rifle combined socket and switch 8 links to each other with the rifle on-off plug of welding gun.

The control front panel as shown in Figure 2, is provided with power switch 12, power supply indicator 13, wire feed rate regulator potentiometer 14, fast wire feed knob 15, self-locking/non-self-locking change-over switch 16, wire feed delay time regulator potentiometer 17.After described automatic feeding device and argon-arc welder and TIG automatic feeding welding gun connected, hand-holdable welding gun directly carried out welding operation; Described device master control circuit board comprises: lower pressure rectifier filtering voltage regulation and power supply circuits, sequence circuit, silk fast given control circuit, motor driving controling circuit and braking circuit.

One, operation principle:

Circuit block diagram is seen Fig. 4.

This device is after the step-down of alternating current 220V voltage process input circuit, rectification, the filtering, becomes Rectified alternating current, sends into motor-drive circuit, as the power supply of wire feeding motor.By given circuit given voltage is sent into control circuit, control circuit passes through the comparison operation with feedback voltage and synchronizing voltage, produces the control driving voltage, sends into the wire feeding motor drive circuit, the drive motors running, the work of the argon-arc welder of output circuit control simultaneously.

Two, the internal circuit of each circuit correspondence and circuit working principle

1, lower pressure rectifier filtering voltage regulation and power supply circuits:

Circuit diagram is seen Fig. 5.

The alternating current 220V that is provided by power supply is through the 4A insurance, and power switch is added to the former limit of control transformer, and transformer is 150W, the two 18V alternating currents of secondary output and two two groups of voltages of 27V alternating current.Two 18V alternating currents insert master control borad plug-in unit P8, after the filtering through capacitor C 20, C21, are added to the full bridge rectifier of being made up of four diode D20～D23, send into the input of voltage-stabilized power supply LM7815 and LM7915 after capacitor C 22～C25 filtering respectively.Diode D24, D25 are the overvoltage protection diode.The output of voltage-stabilized power supply LM7815 and LM7915 exports respectively+15V and-15V, after the filtering through capacitor C 26, C28, C27, C29, resistance R 60, R61, output is as the working power of other circuit, and resistance R 62 is the current-limiting resistance of power supply indicator, and LED is a power supply indicator.

2, sequence circuit:

Circuit diagram is seen accompanying drawing 6

(1) non-self-locking state: when the rifle switch closure, after+15V process resistance R 16, capacitor C 3 filtering, be added to 5 jiaos of not gate U5C (CD40106), CD40106 is six groups of Schmidt trigger integrated circuits, 6 jiaos be output as low, through the short time delay of diode D4, resistance R 17 and capacitor C 4, to prevent misoperation, be added to 9 jiaos of not gate U5D then, 8 jiaos are output as high level, and this signal is the switch activated control signal of rifle.It at first is added to or door U8B (CD4071) 6 jiaos, CD4071 is four groups of double input ends or door integrated circuit, and this moment or door are low level by 5 jiaos of U8B, or 4 jiaos of door U8B are output as high level, after resistance R 21, capacitor C 7 current limliting filtering, drive relay J 1 adhesive.The normally opened contact of relay J 1 is by the control end of the external argon-arc welder of plug-in unit P5.Relay J 1 normally opened contact adhesive, argon-arc welder starting, the electric arc operate as normal of igniting.This signal of while is added to 9 jiaos of electronic switch U2 (CD4053) by diode D3, electric capacity R14, CD4053 is three groups of two-way simulant electronic switch integrated circuits, 9 jiaos of control ends are high, make 5 jiaos and 4 jiaos of disconnections of electronic switch U2, make the fast given voltage of silk normally send into the wire feed drive circuit, wire feeding motor rotates by given voltage.The switch activated control signal of rifle is added to brake control circuit simultaneously, and brake metal-oxide-semiconductor T2 is ended, and decontrols wire-feed motor.Unclamp the rifle switch, wire-feed motor quits work earlier, and the argon-arc welder time-delay stopped welding in 0.2 second.

(2) self-locking state: identical when the welding job state is with non-self-locking when pressing the rifle switch closure at first for the first time, but because program switch is at self-locking position, self-lock switch is in off-state, so 1 angle voltage of this moment or door U8B (CD4071) is low, simultaneously because the rifle switch closure, or 2 angle voltages of door U8B also are low, and 3 jiaos are output as low, 4,11 jiaos of the reset terminals of relieving trigger U4B (CD4013) make trigger U4B operate as normal.CD4013 is that two MS master-slave D flip-flops are also referred to as delayed-trigger, the change of its output state depends on the trigger action of clock pulses, both when clock pulses triggers, the input data transfer to output (Q end) by data terminal (D end), and delayed-trigger CD4013 is triggered by the clock pulses rising edge.This moment, the rifle switch enable signal was added to 9 jiaos of trigger U4B, 9 jiaos of trigger U4B is high, the welding machine starting the arc has welding current to produce, be parallel to the tongue tube on the output cable because the effect in the magnetic field of electric current generation is arranged, the tongue tube adhesive, + 15V is through resistance R 18, after the filtering of capacitor C 5, be added to 11 jiaos of not gate U5F (CD40106), through diode D5, resistance R 19, after the integer of the time-delay of capacitor C 6 and not gate U5F (CD40106), be added to 11 jiaos of trigger U4B, 11 jiaos is high, 13 jiaos of trigger U4B become height, 13 jiaos with or door U8B (CD4071) 5 jiaos link to each other, or 4 jiaos of door U8B have been high level at this moment, unclamp the rifle switch, because trigger U4B is a D flip-flop, have the maintenance function, 13 jiaos of trigger U4B remain high level, so argon arc welding machine and wire feeding motor operate as normal.When needs finish this operation, pin the rifle switch again, 3 jiaos of trigger U4A is high, 5 jiaos has been high, 1 jiao of trigger U4A becomes height, at first 11 jiaos of this level control electronic switch U2 (CD4053), the receipts arc rotating speed that given rotating speed is transformed into be made up of resistance R 3, R4 is received the arc wire feed, when unclamping the rifle switch 2 of not gate U6A jiaos by the low height that becomes, be added to 1 jiao with door U7A, with 2 jiaos of door U7A 1 jiao of this moment that link to each other with trigger U4A be high, become high level with 3 jiaos of door U7A.It make or door 2 jiaos of U8A for high, or door be a height by 3 jiaos of U8A, two D flip-flop zero clearings of trigger U4A are resetted, make or door becomes low by 5 jiaos of U8B, be low 6 jiaos of this moments, and 4 jiaos by high step-down, through resistance R 21, capacitor C 7, diode D17 time-delay 0.2 second, relay J 1 normally opened contact is disconnected, and argon arc welding machine quits work.

3, given circuit:

Circuit diagram is seen accompanying drawing 7.

+ 15V is added on the wire feed rate regulator potentiometer through resistance R 1, after the voltage process capacitor C 1 that potentiometer is regulated, resistance R 2 filtering, is given to 3 jiaos of operational amplifier U1 (LM324), and LM324 is the four-operational amplifier integrated circuit.2 jiaos and 1 jiao of operational amplifier U1 are connected to form voltage follower, 1 jiao outputs on 12 jiaos of electronic switch U2 (CD4053), 13 jiaos is that resistance R 3 is formed a fixed voltage value with R4, usefulness when receiving arc as the fast magnitude of voltage of low silk, 11 jiaos of control ends of electronic switch for this reason.14 jiaos is output; through operational amplifier U1B; resistance R 5 is added to 10 jiaos of operational amplifier U1; operational amplifier U1C and potentiometer W1; resistance R 6 is formed in-phase amplifier; regulator potentiometer W1 can change the magnitude of voltage of the 8th jiao of operational amplifier U1; potentiometer W1 is that the wire feed rate maximum is adjusted potentiometer; resistance R 11; potentiometer W2 and operational amplifier U3A form the wire feed rate minimum of a value and adjust circuit; 8 jiaos of operational amplifier U1 through resistance R 9; 1 jiao of operational amplifier U3 through resistance R 10; together be added to 12 jiaos of operational amplifier U1; operational amplifier U1D and resistance R 7; R8; R9; R10 forms in-phase adder; with two magnitude of voltage additions; 14 jiaos of outputs of operational amplifier U1 are after resistance R 12, and as delivering to the rear end drive circuit for fixed thread speed voltage, D1 is the protection diode.

4, drive circuit and braking circuit:

Circuit diagram is seen accompanying drawing 8

Two 27V alternating currents are rectified into Rectified alternating current by diode D8, D7, resistance R 23, be added to the anode that drives controllable silicon T1, the rectification amplitude limiter circuit that simultaneously two 27V alternating currents are formed through diode D13, D12, resistance R 30, R29, voltage-stabiliser tube DW1, be added to 6 jiaos of operational amplifier U3 (LM324), the synchronous circuit of forming by resistance R 32, R33, R31, operational amplifier U3B, diode D14, resistance R 34, R35, triode T3, resistance R 46, capacitor C 5, forming frequency is the square wave of 100HZ, is added to the anode of programmable unijunction transistor T9 N13T1.The feedback voltage of sampling and from the anodal current-limiting resistance of wire feeding motor, through resistance R 36, capacitor C 12, resistance R 37, R38, diode D15, resistance R 39, the feedback circuit that voltage-stabiliser tube DW3 forms, be added to the base stage of amplifying triode T4, simultaneously given signal is through capacitor C 14, resistance R 42 is added to the emitter stage of amplifying triode, by amplifying triode T4, capacitor C 3, resistance R 40, R41 forms transistor amplifier and carries out differential amplification, through resistance R 13, triode T5, T6, resistance R 44, triode T7, T8, after resistance R 45 is formed triode operational amplification circuit computing amplification, be added to the anode of programmable unijunction transistor T 9, by resistance R 48, R47 forms the control end that programming Control voltage is added to programmable unijunction transistor T9, make programmable unijunction transistor T9 be output as oblique triangular wave, through not gate U6C, after the U6D shaping, become controlled square-wave voltage, be added to 8 jiaos with door U7 (CD4081), 9 jiaos is enabling signal, be low when not working at ordinary times, when providing, enabling signal decontrols 9 jiaos with door U7,10 jiaos of outputs drive square wave and are added to driver U10 drive integrated circult CD40107 input through resistance R 51, the control of driver U10 output outputting drive voltage drives the trigger electrode of controllable silicon T1 (BTW40-1000), open controllable silicon T1, be added on the wire-feed motor after wire feeding motor voltage process resistance R 27 (0.5/30W) current limliting, wire-feed motor is rotated by wire feed rate regulator potentiometer setting speed, sends welding wire.Diode D9, resistance R 25, R26, capacitor C 11, resistance R 24, capacitor C 10 are the holding circuit of controllable silicon T1.

Fast wire feed control: press 1 jiao that is added to not gate U5 after the filtering of fast wire feed button+15V through resistance R 15, capacitor C 2, shaping through not gate U5A, U5B, diode D2, be added to 9 jiaos of electronic switch U2 (CD4053), make 14 jiaos of relievings of wire feed voltage given end operational amplifier U1, the wire feed voltage given is closed braking circuit simultaneously to motor-drive circuit, makes motor rotation, but also inoperative argon-arc welder just send welding wire.

Braking circuit: fast wire feed enabling signal (ZS) is added to or 8 jiaos of door U8 (CD4071), rifle switch enable signal (KS) is added to or door 9 jiaos of U8, two signals have one for high, export 10 jiaos just for high, shaping becomes low level through not gate U6B (40106), be added to 6 jiaos with door U7 (CD4081), with 6 jiaos of door U7 be low, become low with 4 jiaos of outputs of door U7, be added to the grid of braking metal-oxide-semiconductor T2 (IRF450) through diode D10, resistance R 28, the braking metal-oxide-semiconductor loses driving voltage and decontrols wire feeding motor, makes the wire feeding motor operate as normal.When (ZS) or (KS) blackout, become height with 4 jiaos of outputs of door U7, drive braking metal-oxide-semiconductor T2 conducting, block the wire feeding motor driving voltage simultaneously wire feeding motor is braked at once.Link to each other with the synchronizing signal end with 5 jiaos of door U7, prevent to brake metal-oxide-semiconductor T2 misoperation.The wire feed delay circuit that the low level of not gate U6B (40106) output is simultaneously formed through diode D16, capacitor C 16, not gate U6E and wire feed starting time-delay regulator potentiometer is added to 9 jiaos with door U7, and time-delay is decontroled and driven signal end.

Claims (5)

1, a kind of TIG welding automatic feeding device, it comprises: master board (27), wire feeding motor (28), TIG welds automatic feeding welding gun (11), the control front panel, control rear board and shell, it is characterized in that: control rear board negative input (1) links to each other with argon-arc welder cathode output end (1 '), the control end of rear board (2) is connected with argon-arc welder control joint (2 '), the air outlet adapter of rear board (3) is connected with the inlet suction port (3 ') of argon-arc welder, power line (4) is connected to the 220V AC power, the cathode output end (5) of control front panel is connected with the cable connector of TIG automatic feeding welding gun, wire feed joint (6) links to each other with the wire convey soft pipe (6 ') of welding gun, and air outlet adapter (7) links to each other with the air inlet pipe of welding gun, and rifle combined socket and switch (8) links to each other with the rifle on-off plug of welding gun; The control front panel is provided with power switch (12), power supply indicator (13), wire feed rate regulator potentiometer (14), fast wire feed knob (15), self-locking/non-self-locking change-over switch (16), wire feed delay time regulator potentiometer (17); Described device and TIG automatic feeding welding gun and argon-arc welder connect into a collaborative work device; Described device master board comprises: lower pressure rectifier filtering voltage regulation and power supply circuits, sequence circuit, wire-feeding control circuit, and braking circuit.

2, TIG welding automatic feeding device according to claim 1, it is characterized by: described voltage commutation filtering voltage regulation and power supply circuits comprise: the rectification circuit that diode D20～D23 forms, the filter circuit that capacitor C 20～C25 forms, the power supply circuits that power module of voltage regulation LM7815, power module of voltage regulation LM7915, diode D24, diode D25, capacitor C 26～C29, resistance R 10, resistance R 11 are formed.

3, TIG welding automatic feeding device according to claim 1, it is characterized by: the rifle switch is received not gate U5C input after the resistance R 16 of parallel connection and the equal ground connection of the other end, capacitor C 3, after the resistance R 17 of reversal connection diode D4 in the parallel connection of not gate U5C output termination, meet not gate U5D, connect the capacitor C 4 of an other end ground connection between diode D4, the resistance R 17 NAND gate U5E; The output of not gate U5D is received the D end of trigger U4B;

A tongue tube is through the resistance R 18 of parallel connection and the equal ground connection of the other end, the input that capacitor C 5 is received not gate U5E, after the resistance R 19 of reversal connection diode D5 in the parallel connection of not gate U5E output termination, meet not gate U5F, the capacitor C 6 that is connected to other end ground connection between diode D5, the resistance R 19 NAND gate U5F, and the output of not gate U5F is received the CLK end of trigger U4B;

Self-locking/non-self-lock switch via the resistance R 22, resistance R 20 of series connection with or a door U8A link to each other, connect capacitor C 9, the capacitor C 8 of an other end ground connection respectively at the two ends of resistance R 22;

The output of not gate U5D is connected to the input of not gate U6A or door U8A, the CLK end of trigger U4A in proper order, or the output of door U8A connects the R end of the input of trigger U4, the input of the output termination of not gate U6A and door U7A;

One end of the output of the output termination of not gate U5D or door U8B, inferior end links to each other with the rifle thread switching control, or the other end of door U8B is connected with the output Q end of trigger U4B; Be connected with the output Q end of trigger U4A with another input of door U7A, link to each other with receipts arc control line simultaneously; Or door U8B output links to each other through the relay J 1 of resistance R 21 and welding machine control, connects the capacitor C 7 of an other end ground connection between relay J 1 and the resistance R 21; Resistance R 21 with or door be connected the control line of fast wire feed enabling signal ZS between the U8B.

4, TIG welding automatic feeding device according to claim 1, it is characterized by: the fast given circuit of described silk comprises: "+" that the fast adjuster of silk is received operational amplifier U1A through resistance R 1, capacitor C 1, resistance R 2 holds the output termination electronic switch U2 of operational amplifier U1A; Electronic switch U2 output X terminates to "+" end of operational amplifier U1B, operational amplifier U1B output series resistor R5, "+" that be connected to the amplifier of being made up of operational amplifier U1C, resistance R 6, potentiometer W1 through resistance R 5 holds, and operational amplifier U1C output is received "+" end of the adder of being made up of resistance R 8, resistance R 7, operational amplifier U1D through resistance R 9; Silk velocity modulation nodal potential device other end ground connection, resistance R 11 is with potentiometer W2 and be connected to "+" end of operational amplifier U3A after connecing, "+" that operational amplifier U3A output is also received adder through resistance R 10 holds, and adder is exported to the fast given voltage end of silk through the diode D1 of resistance R 12, reversal connection ground connection.

5, TIG welding automatic feeding device according to claim 1, it is characterized by: described wire-feeding control circuit and braking circuit comprise: it all is diode D12, diode D13 and diode D7, the diode D8 that is just connecing that the two 27V power inputs of interchange connect respectively; Diode D12, diode D13 be series resistance R30, resistance R 29 respectively, and the negative pole of diode D12 links to each other with the negative pole of diode D13; "-" end of resistance R 29 and the input of receiving the comparator of forming by resistance R 32, resistance R 33, resistance R 31, operational amplifier U3B after voltage-stabiliser tube DW1 is in parallel; The output of comparator connects diode D14, diode D14 series resistance R34, receive the base stage of triode T3 after the resistance R 35 of resistance R 34 ground connection in parallel, the colelctor electrode of triode T3 is received the input of programmable unijunction transistor T9 through resistance R 46, capacitor C 15;

After the resistance R 36 and C12 of wire-feed motor feedback voltage through serial connection back ground connection, resistance R 38 dividing potential drops by resistance R 37, ground connection, diode D15, the resistance R 39 of reversal connection, the voltage-stabiliser tube DW3 of reversal connection then connect, through connecing capacitor C in parallel 13 and resistance R 40, resistance R 41 behind the voltage-stabiliser tube DW3, voltage-stabiliser tube DW3 also receives the base stage of triode T4, and the emitter stage of triode T4 connects given electricity end through resistance R 42; The colelctor electrode process resistance R 43 of triode T4 is received the input of the operational amplification circuit of being made up of resistance R 44, triode T5, triode T6, triode T7, triode T8, and the output of operational amplification circuit is also received the input of programmable unijunction transistor T9 through resistance R 45;

Programmable unijunction transistor T9 and resistance R 47, resistance R 48, resistance R 49 are formed controller, and the output of programmable unijunction transistor T9 is the output of controller; Pass through not gate U6C, not gate U6D, link to each other with the trigger electrode of controllable silicon T1 with door U7C, driver U10, resistance R 25, diode D9, the negative pole of controllable silicon T1 links to each other with wire-feed motor feedback voltage positive terminal through resistance R 27;

Connect the positive pole of controllable silicon T1 after diode D7, the diode D8 parallel connection, parallel resistance R23 after the negative pole of diode D7, diode D8 links to each other, resistance R 23 other end ground connection;

The brake signal end with or the door U8C input link to each other, or the output termination not gate U6B input of door U8C, the output termination of not gate U6B and door U7B, receive the control utmost point of braking metal-oxide-semiconductor T2 with the output of door U7B through diode D10, resistance R 28, metal-oxide-semiconductor T2 is connected with wire-feed motor feedback voltage positive terminal again.

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