CN2268596Y - Anti-electric shocking device of energy saving arc welding transformer as separate power supply - Google Patents

Abstract

The utility model relates to an anti-electric shocking device of energy saving arc welding transformer as a separate power supply, which is characterized in that a choke coil L and a capacitor pressure reducing circuit are connected in series with one side of a primary coil of an arc welding transformer B1; both ends of the primary coil B1 are connected with a sampling transformer B2; a signal of the sampling transformer B2 can control the work of an alternating current contactor C through a voltage comparator circuit; a current mutual inductor B4 is arranged on a main loop of the primary pole of the arc welding transformer; when the current mutual inductor does not have welding current after triggering condition, the delaying switching off of the alternating current contactor can be carried out. The utility model has the advantages of remote control, high sensitivity and energy saving.

Description

Can be used as the energy-saving arc welding transformer anti-electric shock apparatus of independent current source power supply

The utility model relates to a kind of safeguard protection and energy saver of arc welding transformer.

Traditional AC and DC arc-welding machine, mash welder, arc cutting machine, when being interrupted welding job normally, be to be in "on" position always, particularly to the comparatively general hand ac arc welding machine of present use, electric current is quite big when zero load, and general welding machine is in ten to tens amperages, and its transformer secondary floating voltage is also quite high, generally in 60～85 volts of I frequency voltage ranges, human body is directly constituted Danger Electric shock risk.

The purpose of this utility model is to provide a kind of energy-conservation, safety and can starts to control at a distance and the highly sensitive energy-saving arc welding transformer anti-electric shock apparatus that can be used as the independent current source power supply.

The key that the purpose of this utility model realizes is:

A kind of energy-saving arc welding transformer anti-electric shock apparatus that can be used as the independent current source power supply is characterized in that: at arc welding transformer B ₁Primary coil one side is serially connected with choking coil L and capacity voltage dropping circuit; Described capacity voltage dropping circuit is by the capacitor C of one group of different capabilities ₀, C ₁, C ₂, with divide each contact select device K compositions that be connected, according to the different model motor, the selection matching capacitance; The elementary arc welding transformer B that is directly parallel in that one sampling transformer B2 is arranged ₁Elementary two ends, the voltmeter V of demonstration secondary safe voltage value _bAlso be connected on B ₁Elementary two ends; The output of described sampling transformer is by rectifier Z ₁, rectifying and wave-filtering, shaping circuit, voltage comparator circuit be connected with the control circuit of A.C. contactor C, when the short circuit of arc welding transformer secondary work, triggers the adhesive A.C. contactor, makes arc welding transformer be in state to be welded; At the elementary major loop of arc welding transformer current transformer B is set ₄, described current transformer B ₄Output by amplifying circuit IC ₅Be connected with a delay circuit, this delay circuit behind above-mentioned triggering state to be welded, current transformer B ₄During non-inductive voltage, time delayed turn-off A.C. contactor C.

Described voltage comparator circuit is by secondary voltage comparator IC ₁, IC ₂Form described IC ₁Negative input end and the rectifier Z of described sampling transformer output ₁Rectifying and wave-filtering, shaping circuit C ₄, R ₁, R ₂Be connected IC ₁Anode with adjust potentiometer W ₁Armature contact be connected IC ₁Output and IC ₂Positive input terminal be connected IC ₂Negative input end and another adjust potentiometer W ₂Armature contact be connected IC ₂Output and the relay J of described ac contactor control circuit ₄The controllable silicon SCR that is connected in series on the branch road ₃Trigger electrode and working indicating LED ₁, LED ₂Control relay J ₃The controllable silicon SCR that is connected in series on the branch road ₂Trigger electrode be connected; Described J ₃Normally opened contact J _3K, normally-closed contact J _3BBe serially connected in LED respectively ₁, LED ₂On the branch road; Described J ₄Normally opened contact J _4KBe serially connected on the power supply branch road of A.C. contactor C.

Described delay circuit is by amplifier IC ₅, controllable silicon SCR ₁, SCR ₄Relay J ₁, J ₂, J ₅Voltage comparator ic ₃, IC ₄With charge and discharge capacitance C ₁₂Form; Described current transformer B ₄Output and amplifier IC ₅Input be connected; IC ₅Output and controllable silicon SCR ₁Trigger electrode be connected, at SCR ₁On the branch road and be connected to relay J ₁, J ₂, J wherein ₂Normally opened contact J _2KWith above-mentioned normally opened contact J4K and meet J ₁Normally-closed contact J _1BBe serially connected in power supply ground and comparator IC with the auxiliary contact C of A.C. contactor C ₃Negative input end between, IC ₃Positive input termination positive source; IC ₃Output is by potentiometer W ₃With another voltage comparator ic ₄Positive pole be connected IC ₄Negative input end be connected IC with the armature contact of another potentiometer ₄Positive input terminal and power supply ground between be connected to J respectively ₂Normally opened contact J _2KWith charge and discharge capacitance C ₁₂, IC ₄Output and controllable silicon SCR ₄Trigger electrode be connected relay J ₅With SCR ₄Be serially connected in both ends of power, J ₅Normally-closed contact J _5BWith J ₄Another normally opened contact J _4KBe serially connected in positive source and above-mentioned controllable silicon SCR ₃Between the trigger electrode; After triggering state to be welded, not continuous welding, current transformer B ₄Non-inductive voltage output, SCR ₁Do not work J ₁B is failure to actuate, the auxiliary contact C adhesive of A.C. contactor C, IC ₃The output high potential, charge and discharge capacitance C ₁₂Charging, when setting value, IC ₄Output Gao Ping, J ₅Work makes J _4KLatching circuit in J _5BDischarge, the A.C. contactor dead electricity is got back to the triggering state for the treatment of.

The utlity model has following advantage:

1. do not need to follow electric welding machine together, it can be used as one independently supply unit send electricity to give required control appliance, realized remote stating control condition;

2. trigger sensitivity height;

3. secondary voltage is when being interrupted welding job, and is adjustable between 10-36V, therefore has the electrocution-proof protection function; And be applicable to the electric welding machine of various different capacities.

4. energy-conservation, owing to the effect of dividing potential drop electric capacity, its unloaded power consumption is at 300-500mA when unloaded.

The drawing explanation:

Accompanying drawing is an embodiment circuit diagram of the present utility model.

The utility model operation principle is as follows:

At arc welding transformer B ₁Primary coil one side serial connection capacitor C ₀Or C ₁, C ₂, C ₃Form capacity voltage dropping circuit, since inconsistent to various different arc welding transformer primary coil reaction impedances, therefore select device K and select the capacitor of different capabilities to mate in the safe voltage control range of needs by branch, sampling transformer B is arranged then ₂The elementary arc welding transformer B that is directly parallel in ₁Elementary two ends also are created in sampling transformer B simultaneously by the voltage behind the capacitance decompression ₂Two ends, and by voltmeter V _bShow secondary safe voltage value.

Sampling transformer B ₂The AC signal of output is by rectifier Z ₁And C ₄, R ₁, R ₂Rectifying and wave-filtering has been added to voltage comparator circuit IC after the shaping ₁Negative terminal, adjust potentiometer W ₁Make voltage comparator circuit IC ₁Positive terminal voltage makes it be output as low level, like this IC circuit a little less than negative terminal ₂Be all low level equally, so pass through resistance R ₆The controllable silicon SCR of control ₂And R ₇, D ₃The controllable silicon SCR of control ₃Triggering and conducting relay J not ₃, J ₄Also not adhesive, its contact J ₄K ₁, J ₄K ₂Often open, the A.C. contactor of main circuit is because of not adhesive of dead electricity, normally opened contact J _3KWith normally-closed contact J _3BBe failure to actuate green LED ₁Not luminous Red LED1 LED ₂Indication ruddiness, entire circuit is in the triggering state for the treatment of like this.

As arc welding transformer B ₁Secondary output work transcient short circuit time is reacted to transformer B ₁The primary coil both end voltage also descends immediately, therefore at voltage comparator circuit IC ₁Under the constant situation of anode input voltage,, make voltage comparator circuit IC along with the decline of sampling voltage ₁Negative terminal voltage makes IC circuit far below positive terminal voltage ₁, IC ₂The output high level triggers controllable silicon SCR ₂, SCR ₃Conducting, controlled relay J ₃, J ₄Adhesive, normally opened contact J ₄K ₁, J ₄K ₂Closure, A.C. contactor C gets electric back adhesive, makes to be connected in parallel on capacitor C ₀On contactor C main contact CK ₁, CK ₂, CK ₃Closure, the elementary rated operational voltage that obtained of arc welding transformer like this.The positive potential of a end passes through resistance R at the same time ₁₅Normally opened contact J ₄K ₂With normally-closed contact J _5BBe added in controllable silicon SCR again ₃On, latching circuit is finished the work, and arc-welding machine is in state to be welded.

If arc-welding machine does not continue welding, arc welding transformer B after triggering state to be welded ₁Primary coil loops is provided with operating current, therefore is arranged on the current transformer B on the arc welding transformer primary return ₄Output is provided with induced voltage, IC ₅Output low level, controllable silicon SCR ₁Not conducting, normally-closed contact J _1B, normally opened contact J ₂K ₁, J ₂K ₂, J ₁K is failure to actuate, because the adhesive of A.C. contactor C, its auxiliary normally opened contact C is the closure and the normally-closed contact J that connects also ₁B is short circuit over the ground, makes and originally sets voltage comparator circuit IC ₃The high status of negative terminal is zero, and the output high level is then by delay selection potentiometer W ₃To capacitor C ₁₂Charging, booster tension comparison circuit IC simultaneously ₄The current potential of anode is when its current potential is raised to negative terminal current potential than former setting when slightly high, IC circuit ₄The output high level passes through resistance R then ₁₄Trigger controllable silicon SCR ₄Conducting, relay J ₅Adhesive makes the normally-closed contact J in the latching circuit _5BDischarge relay J ₄Normally opened contact J ₄K ₁, J ₄K ₂Also discharge simultaneously, reset after the A.C. contactor dead electricity like this, circuit has been come back to treat the triggering state.

Repeat, trigger state to be welded as arc-welding machine after, the situation that continues welding is just in time opposite; IC ₅The output high level triggers controllable silicon SCR ₁Conducting, relay J ₁, J ₂Adhesive, normally opened contact J _1KClosure is made status indicator lamp LED ₃Luminous, normally-closed contact J _1BDischarge, even therefore A.C. contactor auxiliary contact C closure makes voltage comparator circuit IC ₃The negative terminal current potential can not be zero, and no high level output is not also to capacitor C ₁₂Charging is again because normally opened contact J ₂K ₂Closed one is to prepare from zero timing for next one time-delay, the 2nd, make voltage comparator circuit IC ₄Anode is a zero potential, output low level, controllable silicon SCR ₄Not conducting, relay J ₅Normally-closed contact J _5BBe failure to actuate, make the positive potential of a end pass through resistance R ₁₅Contact J ₄K ₂, J ₅B continues to be added in controllable silicon SCR ₃On, make relay J ₄Normally opened contact J ₄K ₁, J ₄K ₂Locate closure state always.

Claims (3)

1, a kind of energy-saving arc welding transformer anti-electric shock apparatus that can be used as the independent current source power supply is characterized in that: at arc welding transformer B ₁Primary coil one side is serially connected with choking coil L and capacity voltage dropping circuit; Described capacity voltage dropping circuit is by the capacitor C of one group of different capabilities ₀, C ₁, C ₂, with divide each contact select device K compositions that be connected, according to the different model motor, the selection matching capacitance; One sampling transformer B is arranged ₂The elementary arc welding transformer B that is directly parallel in ₁Elementary two ends, the voltmeter V of demonstration secondary safe voltage value _bAlso be connected on B ₁Elementary two ends; The output of described sampling transformer is by rectifier Z ₁, rectifying and wave-filtering, shaping circuit, voltage comparator circuit be connected with the control circuit of A.C. contactor C, when the short circuit of arc welding transformer secondary work, triggers the adhesive A.C. contactor, makes arc welding transformer be in state to be welded; At the elementary major loop of arc welding transformer current transformer B is set ₄, described current transformer B ₄Output by amplifying circuit IC ₅Be connected with a delay circuit, this delay circuit behind above-mentioned triggering state to be welded, current transformer B ₄During non-inductive voltage, time delayed turn-off A.C. contactor C.

2, a kind of energy-saving arc welding transformer anti-electric shock apparatus that can be used as the independent current source power supply as claimed in claim 1, it is characterized in that: described voltage comparator circuit is by secondary voltage comparator IC ₁, IC ₂Form described IC ₁Negative input end and the rectifier Z of described sampling transformer output ₁Rectifying and wave-filtering, shaping circuit C ₄, R ₁, R ₂Be connected IC ₁Anode with adjust potentiometer W ₁Armature contact be connected IC ₁Output and IC ₂Positive input terminal be connected IC ₂Negative input end and another adjust potentiometer W ₂Armature contact be connected IC ₂Output and the relay J of described ac contactor control circuit ₄The controllable silicon SCR that is connected in series on the branch road ₃Trigger electrode and working indicating LED ₁, LED ₂Control relay J ₃The controllable silicon SCR that is connected in series on the branch road ₂Trigger electrode be connected; Described J ₃Normally opened contact J _3K, normally-closed contact J _3BBe serially connected in LED respectively ₁, LED ₂On the branch road; Described J ₄Normally opened contact J _4KBe serially connected on the power supply branch road of A.C. contactor C.

3, a kind of energy-saving arc welding transformer anti-electric shock apparatus that can be used as the independent current source power supply as claimed in claim 1, it is characterized in that: described delay circuit is by controllable silicon SCR ₁, SCR ₄Relay J ₁, J ₂, J ₅Voltage comparator ic ₃, IC ₄With charge and discharge capacitance C ₁₂Form; Described current transformer B ₄Output and amplifier IC ₅Input be connected; IC ₅Output and controllable silicon SCR ₁Trigger electrode be connected, at SCR ₁On the branch road and be connected to relay J ₁, J ₂, J wherein ₂Normally opened contact J _2KWith above-mentioned normally opened contact J _4KAnd meet J ₁Normally-closed contact J _1BBe serially connected in power supply ground and comparator IC with the contact C of A.C. contactor C ₃Negative input end between, IC ₃Positive input termination positive source; IC ₃Output is by potentiometer W ₃With another voltage comparator ic ₄Positive pole be connected IC ₄Negative input end be connected IC with the armature contact of another potentiometer ₄Positive input terminal and power supply ground between be connected to J respectively ₂Normally opened contact J _2KWith charge and discharge capacitance C ₁₂, IC ₄Output and controllable silicon SCR ₄Trigger electrode be connected relay J ₅With SCR ₄Be serially connected in both ends of power, J ₅Normally-closed contact J _5BWith J ₄Another normally opened contact J _4KBe serially connected in positive source and above-mentioned controllable silicon SCR ₃Between the trigger electrode; After triggering state to be welded, not continuous welding, current transformer B ₄Non-inductive voltage output, SCR ₁Do not work J ₁B is failure to actuate, the contact C adhesive of A.C. contactor C, IC ₃The output high potential, charge and discharge capacitance C ₁₂Charging, when setting value, IC ₄Output Gao Ping, J ₅Work makes J _4KLatching circuit in J _5BDischarge, the A.C. contactor dead electricity is got back to the triggering state for the treatment of.

Images