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Thread feeder and arc-welding apparatus having the thread feeder

A technology of arc welding and feeding device, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc. It can solve the problems of high risk of control lines, long time of wire feed motor rotation stop, etc., and improve workability , Reliability improvement, disconnection reduction effect

Inactive Publication Date: 2012-10-03
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the conventional wire feeding device, a control line for sending a feed stop signal from the welding power source to the drive circuit for opening and closing the second switching circuit and a control line for supplying a control voltage to the drive circuit DR are required.
[0013] In addition, in severe welding work places where large-scale structures are built, there are cases where the installation place of the welding power source and the installation place of the wire feeding device are separated by, for example, 50 m or more. The risk of wire breakage increases due to the increase in the number of control wires for the wire feeding device
(For example, the control wire is in contact with a sharp point of the structure arranged at the welding work place and the wire is broken, etc.), and the wire feed motor MO will not be caused by the wire break when starting and stopping the wire feeding motor. The second path for electromotive force discharge increases the time to stop the rotation of the wire feed motor

Method used

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  • Thread feeder and arc-welding apparatus having the thread feeder
  • Thread feeder and arc-welding apparatus having the thread feeder
  • Thread feeder and arc-welding apparatus having the thread feeder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0041] The motor stop determination circuit MS1 of the first embodiment is based on figure 2 The detailed diagram shown is formed by the first comparison circuit CP1, the first reference circuit RF1, and the first NOT circuit NOT1. The first reference circuit RF1 sets a predetermined positive first reference value, and the first comparison circuit CP1 compares the first The value of the current detection signal Id1 is compared with the first reference value. The first NOT circuit NOT1 inverts the output of the first comparison circuit CP1 and outputs it as a motor stop determination signal Ms.

[0042] The second switching circuit SW2 is formed by a switching element (IGBT) or the like (hereinafter referred to as switching element SW2). The switching element SW2 whose motor stop determination signal Ms becomes high is turned on to connect the second brake resistor R2 with the wire Connect the motor MO in parallel.

[0043] Figure 4 A waveform timing chart for explaining the oper...

Embodiment approach 2

[0067] The motor stop judgment circuit MS2 of the second embodiment is based on Image 6 The detailed diagram shown is formed by the first comparison circuit CP1, the first reference circuit RF1, the second comparison circuit CP2, the second reference circuit RF2, the second NOT circuit NOT2, and the RS-flip-flop circuit FF, based on the first current detection The values ​​of the signal Id1 and the second current detection signal Id2 output a motor stop determination signal Ms.

[0068] Figure 8 A waveform timing chart for explaining the operation of the second embodiment.

[0069] In this figure, the waveform in Figure (A) represents the start signal Ts, the waveform in Figure (B) represents the motor stop determination signal Ms, the waveform in Figure (C) represents the feed start signal Mc, and the waveform in Figure (D) represents the first 1 Current detection signal Id1, the waveform in Figure (E) represents the second current detection signal Id2, the waveform in Figure (...

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Abstract

An arc-welding apparatus has a welding source and a thread feeder. The welding source includes a feed motor control circuit; a motor-drive circuit providing the drive voltage of motor; a first braking resistor, discharging the electromotive force produced during the stopping of the feed motor; a first commutation circuit, connecting the feed motor to the motor-drive circuit or the first braking resistor based on the cutting feed starting signal. The thread feeder includes a second braking resistor for discharging the electromotive force; a current detection circuit, for detecting the drive current of the feed motor or the current discharged by the first braking resistor; a motor stop judgement circuit, judging the stop of the feed motor based on the polarity of the first current detectionsignal; a second commutation circuit, judging whether the signal is in parallel connection to the second braking resistor and the feed motor according to the stop of the motor. The invention resolvesthe problem that the motor stop time becomes longer along with the distance between the welding source and thread feeder, when the cutting feed starting control lines of the welding source and threadfeeder is cut off.

Description

Technical field [0001] The invention relates to an arc welding device, in particular to the remote control of a wire feeding device. Background technique [0002] Picture 9 This is an electrical connection diagram of a prior art arc welding device. In this figure, the welding power source WG is formed by the following parts: the main power circuit PS that supplies power between the wire WL and the workpiece M; the main control circuit SC that controls the main power circuit PS based on the welding voltage command value Wv; A feed motor control circuit MC2 that generates a feed command signal Vset based on the welding current command value Wc, and outputs a feed start signal Mc and a feed stop signal Mt according to the start signal Ts; feeds the wire to the motor MO according to the feed command signal Vset Rotation control motor drive circuit MV; and when outputting the feed start signal Mc, connect the motor drive circuit MV to the wire feed motor MO. When the output of the fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/00B23K9/133
Inventor 草野洁
Owner DAIHEN CORP