Automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and control method

A single-chip microcomputer control, gas-electric vertical welding machine technology, applied in the direction of arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of easy aging, slow dynamic response, low control precision, etc.

Inactive Publication Date: 2011-11-23
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The gas-electric vertical welding system composed of the existing welding power supply with flat external characteristics, constant-speed wire feeding and variable-speed crawling trolley system is mainly used for welding thin wires below 1.6mm and medium and thick plates below 40mm; such as welding large plates above 40mm When the plate is thick, the welding pr

Method used

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  • Automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and control method
  • Automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and control method
  • Automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Such as figure 2 As shown, after the main power is turned on, the chip U1 automatically reads the program into the chip, and the light-emitting diode LCD1 lights up. When the switch UP or DOWM is selected, press the fast travel switch, the circuit starts the fast travel mode, and the given voltage starts from the middle tap of VR5 through R113 and R114, and then through R115, IC1, VR4, R116 and R117 The optocoupler isolation circuit composed of , E1, and C68 enters the No. 4 pin of the AVR single-chip microcomputer, and performs AD conversion inside the single-chip microcomputer, and at the same time generates a PWM pulse signal to drive the DC servo motor. The microcontroller sends the PWM pulse signal and forward and reverse signals to IN1 and IN2 of the TA8429H. When the pressed switch is UP, the input of IN1 is "0" and the input of IN2 is "1", and the motor rotates forward at this time; when the switch is pressed, it is When DOWN, IN1 input is "1" and IN2 input is...

Embodiment 2

[0057] Such as figure 2 As shown, after the main power is turned on, the chip U2 automatically reads the program into the chip, and the light-emitting diode LCD1 lights up. The switch SW2 is placed in the first gear, which is the manual welding mode. First, the climbing speed of the trolley is adjusted by the speed-regulating rheostat VR7, which is input to one end of R27 and then input to the inside of the single-chip microcomputer by R7. After AD conversion, the walking speed of the trolley is adjusted. After pressing the switch SW1, pins 12 and 13 of the single chip microcomputer respectively send PWM pulse signals and motor forward rotation signals to R72 and R73, and then are connected to R71, E8, R68 and R69 through R70, E7, R66 and R67 optocoupler isolation respectively. The IN1, IN2, and EN of the DC servo motor drive chip TA8429, that is, the input of IN1 is "0", and the input of IN2 is "1", and the speed of the DC motor is adjusted at the same time. When the car is...

Embodiment 3

[0060] Such as figure 2 As shown, after the main power is turned on, the chip U1 automatically reads the program into the chip, and the light-emitting diode LCD1 lights up. Put the switch SW2 in the second gear, which is the automatic welding mode. First adjust the rheostat WELDCURRENT, which is a coaxial slider, and at the same time adjust the given welding current. Through the follower composed of R34, R35 and IC4, the output is from pin 14 of IC4. . The center tap of VR16 is connected to one end and then connected to the other end of R35 and pin 14 of IC4. The other end of VR16 is connected with one end of the sliding rheostat STICKOUT. The other end of STICKOUT is connected to one end of VR17, and the middle tap of VR17 is connected to the other end and grounded. To adjust the rheostat STICKOUT is to adjust the dry elongation, and to input one end of R59 into a regulating circuit composed of R39, IC4, R40, R41, C28, C29, VR18, R36, R37, and R38. The welding feedback v...

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Abstract

The invention relates to an automatic voltage regulation (AVR) singlechip control-based thick wire electric-gas vertical welding machine and a control method. The welding machine comprises a three-way trolley travelling set circuit, a swing front and back stop set circuit, a swing amplitude and speed set circuit, a welding torch centering swing control set circuit, a welding start/end control circuit, a digital display circuit, a welding mode selection control circuit, a welding start/stop control circuit, an optocoupler isolation circuit, a travelling motor control drive circuit, a swinging motor control drive circuit and a motor voltage current feedback circuit. In the method, welding voltage is sampled to serve as a feedback control signal of automatic climbing of a trolley and the change of wire feeding speed; when the arc length is increased by interference in the automatic welding process, the arc voltage is increased and the wire feeding speed is increased, so that the arc length is reduced, and the speed of a climbing direct current servo motor is reduced, so that the arc length is reduced; when the arc length is reduced by interference, the arc voltage is reduced and the wire feeding speed is reduced, so that the arc length can be increased; and when the arc length is not changed in the automatic welding process, the wire feeding speed and the travelling speed of the climbing trolley are not changed, so that the arc length is stable.

Description

technical field [0001] The invention relates to an automatic welding equipment and a control method for welding large and thick metal plates, in particular to the composition of a gas-electric vertical welding system, arc length stabilization technology, a digital motion controller and a control method. Background technique [0002] Electric gas welding (EGW for short) is a kind of high-efficiency gas metal arc welding developed jointly by gas metal arc welding and electroslag welding. Compared with narrow-gap MIGA welding, which relies on multiple welding to complete the weld, EGW can form a weld in one welding; compared with electroslag welding, which relies on slag resistance heat for welding, gas-electric vertical welding relies on arc heat. Welding, energy density is higher and more focused. [0003] The existing gas-electric vertical welding system is mainly composed of a welding power source with flat outer characteristics, a constant-speed wire feeding mechanism and...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/095B23K9/073
Inventor 方臣富闫文洋尹明周航宇吴文烈
Owner JIANGSU UNIV OF SCI & TECH
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