CN2232815Y - Shock-proof device of energy-saving manually-operated a.c arc welder - Google Patents

Abstract

The utility model relates to a shock-proof device of an energy-saving manually-operated AC arc welder. The utility model is characterized in that the primary coil of the welding transformer B < 1 > of an AC arc welder is connected with a bidirectional thyristor SCR < 1 > and a switching capacitor parallel branch, and the secondary coil of the welding transformer B < 1 > penetrates through a current transformer probe B < 3 >; when the arc welder stops welding, the current transformer probe B < 3 > output stopping signals, the bidirectional thyristor SCR < 1 > is switched off, and the power supply is cut off; when the arc welder conducts welding, the current transformer probe B < 3 > outputs starting signals, the bidirectional thyristor SCR < 1 > is switched on, and the power supply is switched on. The utility model can prevent human body shock when the arc welder is idle and has the effect of no-load power saving.

Description

Electricity-saving type hand ac arc welding machine anti-electric shock apparatus

The utility model relates to the security protection and the battery saving arrangement of ac arc wedling machine.

At present, the hand ac arc welding machine of being supplied on the market is to be in "on" position when normal stoppage welds always, and under not welding situation, the arc-welding machine primary winding is connected on 380V or the 220V power-frequency voltage usually, and no-load current is also bigger, wastes.The general voltage of the secondary coil of transformer of arc welder exists Danger Electric shock risk all at 60～85V power-frequency voltage to human body.

The purpose of this utility model provides a kind of electricity-saving type hand ac arc welding machine anti-electric shock apparatus.

The utility model is by IGCT SCR ₁, inductance L, switch-capacitor C ₉, C ₁₀, C ₁₁Change-over switch K, current transformer probe B ₃, voltage comparator ic, triggering IGCT SCR ₂And relay J ₁Form.Welding transformer B at ac arc wedling machine ₁Be serially connected with IGCT SCR in primary winding and the AC power line ₁, described IGCT SCR ₁IGCT anti-phase by two and that connect is formed, and is connected to relay J between the trigger electrode of two IGCTs ₂Contact J _1AWith above-mentioned IGCT SCR ₁That in parallel is inductance L and switch-capacitor C ₉, C ₁₀, C ₁₁Branch road, inductance L be by change-over switch K with and the switch-capacitor C that connects ₉, C ₁₀, C ₁₁Be connected; Electrode holder H and workpiece G are connected on welding transformer B ₁On the secondary coil terminal 5,6, its line passes the current transformer probe B ₃, probe B ₃Coil L ₂Be connected on B ₁ Secondary coil terminal 5,6 two ends are provided with a switch T, probe B in its connecting line ₃Another coil L ₃Two ends be connected with two inputs of voltage comparator ic respectively, at coil L ₃Two ends also are connected to resistance R ₁With potentiometer W serial connection branch road; The output of above-mentioned voltage comparator ic and triggering IGCT SCR ₂Trigger electrode be connected, trigger IGCT SCR ₂Be connected on dc source B ₂Two ends, a relay J is arranged ₁Be connected on dc source and trigger IGCT SCR ₂Line in, in relay J ₁Two ends also are connected to an impulse electricity capacitor C ₆

When arc-welding machine is ended welding; produce stopping signal; make IGCT be in cut-off state; thereby cut off the transformer of arc welder power supply; when welding machine welds, there is electric current to produce starting-up signal immediately in the transformer secondary loop, make the IGCT conducting; thereby connect the transformer of arc welder electric current, just can normally weld.

The utility model can be avoided the human electric shock when hand ac arc welding machine is unloaded, have the effect of unloaded economize on electricity simultaneously, and striking is active in one's movements, and has improved the functional reliability of arc-welding machine.

The drawing explanation:

Accompanying drawing is circuit embodiments figure of the present utility model.

Embodiment of the present utility model is as follows: welding transformer B ₁Be serially connected with IGCT SCR in the primary winding ₁, IGCT SCR ₁Two ends also are connected to inductor L and switch-capacitor C ₉, C ₁₀, C ₁₁Branch road, inductor L one end and IGCT SCR ₁One end links to each other, and the other end is connected switch-capacitor C with a movable contact of a heterogeneous K switch of double-throw ₉, C ₁₀, C ₁₁An end all with above-mentioned IGCT SCR ₁The other end is connected, C ₉The other end be connected C with a pair of homophase fixed contact of K switch ₁₀The other end is connected with another movable contact of K switch.C ₁₁The other end be connected with a pair of homophase fixed contact of switch.Electrode holder H and workpiece G are connected to B ₁On the terminal 5,6 of secondary coil, the electrode holder end line passes probe B ₃, when welding machine is unloaded, IGCT SCR ₁Be in cut-off state, 380V voltage is by switch-capacitor C ₉Or C ₁₀, C ₁₁Be added to transformer B ₁The primary circuit on, make welder transformer B ₁The secondary circuit induction obtains 3～4V power-frequency voltage.When electrode holder and workpiece begin to contact, welder transformer B ₁Produce electric current, probe B in the secondary circuit immediately ₃After eliciting electric current, with this starting-up signal input IC, IC triggers IGCT SCR ₂Conducting, relay J ₁Its contact of adhesive J _1A, trigger IGCT SCR ₁Conducting, the welding machine operate as normal.When welding machine leaves workpiece, because in relay J ₁Two ends have also met a capacitor C ₆, so relay J ₁Can not discharge immediately,, just make IGCT SCR through time-delay a period of time (0.6～0.8 second) ₁End, purpose is to prepare for next electrode holder contacts with workpiece, more helps welding.Resistance R in the accompanying drawing ₁, potentiometer W is striking sensitivity testing circuit.IC can select SF54123 special IC, relay J for use ₂Form the green indicating lamp circuit with indicator lamp LD.

Claims (1)

1. A kind of electricity-saving type hand ac arc machine anti-electric shock apparatus, it is characterized in that: this device is by IGCT ScR ₁, inductance L, switch-capacitor C ₉, C ₁₀, C ₁₁Change-over switch K, current transformer probe B ₃, voltage comparator ic, triggering IGCT SCR ₂And relay J ₁Form.Welding transformer B at ac arc wedling machine ₁Be serially connected with IGCT SCR in primary winding and the AC power line ₁, described IGCT SCR ₁IGCT anti-phase by two and that connect is formed, and is connected to relay J between the trigger electrode of two IGCTs ₂Contact J _1AWith above-mentioned IGCT SCR ₁That in parallel is inductance L and switch-capacitor C ₉, C ₁₀, C ₁₁Branch road, inductance L be by change-over switch K with and the switch-capacitor C that connects ₉, C ₁₀, C ₁₁Be connected; Electrode holder H and workpiece G are connected on welding transformer B ₁On the secondary coil terminal 5,6, its line passes the current transformer probe B ₃, probe B ₃Coil L ₂Be connected on B ₁Secondary coil terminal 5,6 two ends are provided with a switch T, probe B in its connecting line ₃Another coil L ₃Two ends be connected with two inputs of voltage comparator ic respectively, at coil L ₃Two ends also are connected to resistance R ₁With potentiometer W serial connection branch road; The output of above-mentioned voltage comparator ic and triggering IGCT SCR ₂Trigger electrode be connected, trigger IGCT SCR ₂Be connected on dc source B ₂Two ends, a relay J is arranged ₁Be connected on dc source and trigger IGCT SCR ₂Line in, in relay J ₁Two ends also are connected to an impulse electricity capacitor C ₆

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