Sequential control scheme for vertically lifting arc strike
A timing control and vertical lifting technology, which is applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of easy sticking to the workpiece and easy arc breaking, etc., and achieve the effect of improving anti-adhesiveness and improving anti-adhesiveness
Inactive Publication Date: 2011-06-29
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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[0003] The purpose of the present invention is to provide a timing control scheme for improving arc ignition, so that the electric welding machine has the property of not sticking to the workpiece in the power-on working state, and improves the arc maintenance performance when the welding torch is pulled out of the workpiece, so as to overcome the current manual electric welding machine. Defects of sticking to the workpiece and easy arc breaking
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[0009] figure 1 It is a circuit principle block diagram of the present invention. Such as figure 1 As shown, the present invention includes a power output circuit, a pre-voltage and current signal filter amplifier circuit, a CPU timing control circuit and a pulse width modulation circuit. The pre-voltage and current signal filter circuit collects the voltage and current signals output by the power output circuit respectively, and feeds back the collected voltage filtered and amplified signals and current filtered and amplified signals to the CPU timing control circuit. The timing control circuit controls the timing of the current setting, analyzes and gives the working control signal of the welding machine and the reference signal of the current setting, and is adjusted by the pulse width modulation circuit, and the pulse width modulation signal is output and fed back to the power output circuit. Realize the control of the given timing of the current.
[0010] figure 2 It...
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The invention discloses a sequential control scheme for a vertically lifting arc strike, which is mainly finished through an 8-bit singlechip (C51). The sequential control scheme for lifting arc strike is programmed in the singlechip (C51), and the sequential control, particularly given sequential control on current, is realized through a central processing unit (CPU) sequential control circuit in the welding process, so that a welding machine is in a periodic working state after electrification, a voltage filter and amplification signal is detected by utilizing a working period so as to judge whether a welding gun contacts a workpiece; moreover, a current given reference signal (Iref) is still kept minimum after the welding gun contacts the workpiece, so that a pulse width modulation signal at the moment the welding gun contacts the workpiece is rapidly reduced to minimum, and after keeping 20MS, the current given reference signal (Iref) slowly rises, so that short-circuit current is 20A. After the short-circuit current is 20A, the voltage signal is continuously detected so as to judge whether the welding gun leaves the wokepiece, and after that the welding gun leaves the wokepiece is detected, the current given reference signal (Iref) is switched to the preset current, and normal welding is performed.
Description
technical field [0001] The invention relates to a time sequence control technology, in particular to a time sequence control technology applied to vertical lifting arc striking in manual electric welding machines. Background technique [0002] At present, the general manual electric welding machine starts to work when the power is turned on, and the current given reference signal (Iref) is set as the short-circuit current. The disadvantage of this setting is that when the welding torch touches the workpiece, the pulse width modulation The signal is not narrowed in time, causing the peak current to last too long, and the welding torch is easy to stick to the workpiece. Especially in low current welding, it is easy to break the arc when the welding torch sticks to the workpiece and pulls it off forcefully. Contents of the invention [0003] The purpose of the present invention is to provide a timing control scheme for improving arc ignition, so that the electric welding mac...
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Inventor 徐欢
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG