CN103302376B - The protection control method of the source of welding current - Google Patents
The protection control method of the source of welding current Download PDFInfo
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- CN103302376B CN103302376B CN201310052777.8A CN201310052777A CN103302376B CN 103302376 B CN103302376 B CN 103302376B CN 201310052777 A CN201310052777 A CN 201310052777A CN 103302376 B CN103302376 B CN 103302376B
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Abstract
The present invention provides the protection control method of the source of welding current, suppresses to weld unexpected interruption by making the temperature protection that the temperature sensor of the source of welding current carries out control to carry out action, thus suppressing the situation that production efficiency reduces.In the guard method of the source of welding current; when the temperature detection value (Hd) of the temperature sensor from the inside being located at the source of welding current reaches predetermined temperature reference value (Ht); cut off the through-flow of welding current (Iw); in the process; estimate temperature detection value (Hd) after the stipulated time, arrive temperature reference value (Ht) time, send " temperature will be become after the ×× second exceed " such alarm based on sound (Ar).After accepting this alarm, weld job person, by changing the countermeasure of welding condition etc. while being implemented in continuing welding, can become end welding before temperature exceedes.Thus, the reduction of production efficiency can be suppressed.
Description
Technical field
The present invention relates to the protection control method of the source of welding current, for protecting the source of welding current when exceeding specified utilization rate and welding.
Background technology
In the source of welding current that the electric arc for carrying out sacrificial electrode electric arc welding, the welding of non-consumable electrode electric arc, plasma-arc welding etc. welds, specified utilization rate is determined.Such as, when the source of welding current of rated welding current 350A is determined the specified utilization rate of 60%, using 10 minutes as 1 cycle, adding up to the welding of the 350A carrying out 6 minutes, within remaining 4 minutes, needs make welding stop.If welding current becomes 300A, then allow utilization rate=(350/300)2× 60=82%.If welding current becomes 271A, then allow that utilization rate becomes 100%, welding can be continuously performed.The source of welding current is determined reason for this is that of specified utilization rate, if exceeding specified utilization rate, the situation of durability then it is arranged at the semiconductor element of the transistor of the inside of the source of welding current, diode etc., transformator and reactor will be heated, thus can be burnt out or reduce.
In the prior art; in order to prevent from exceeding utilization rate; past 10 minutes interior welding current square meansigma methods exceed rated welding current square with specified utilization rate long-pending time (when the temperature rising value within the source of welding current exceedes temperature rising value when using under specified utilization rate); cut off the through-flow of welding current and stop welding, thus protecting the source of welding current (with reference to patent documentation 1).Additionally; the temperature sensor at the part installation number place of high temperature is become at semiconductor element, transformator, reactor etc.; cut off the through-flow of welding current when temperature detection value in temperature sensor exceedes temperature reference value and stop welding, thus protecting the source of welding current (with reference to patent documentation 2).Now, weld with specified utilization rate owing to the source of welding current can guarantee that, when therefore welding with specified utilization rate, do not reach the mode of temperature reference value according to the temperature detection value of temperature sensor and carry out the thermal design of the source of welding current.
Patent documentation
Patent documentation 1:JP Unexamined Patent 11-259149 publication
Patent documentation 2:JP JP 2008-229644 publication
When weld job person welds the slab etc. of Steel Structure, bridge etc., the situation that long-time continuous through-flow big electric current carries out welding is comparatively common.In this case, also can produce to become the such situation of the state exceeding specified utilization rate.As described above, in order to protect the source of welding current, and interrupt welding forcibly.Interrupt the workpiece of welding in the midway of welding or discarded, or restart welding from interruption.No matter in which kind of situation, all can lost time, reduce production efficiency.
Summary of the invention
Therefore, in the present invention, it is therefore intended that provide in electric arc welds, it is possible to realize the protection of the source of welding current when exceeding specified utilization rate while, suppress the protection control method of the source of welding current of production efficiency reduction.
In order to solve above-mentioned problem; the invention of technical scheme 1 is the protection control method of a kind of source of welding current; the temperature within the source of welding current is detected by temperature sensor; when this temperature detection value arrives predetermined temperature reference value; cut off the through-flow of welding current; it is characterized in that, estimate described temperature detection value after the stipulated time, arrive described temperature reference value time, send alarm.
The invention of technical scheme 2, on the basis of the guard method of the source of welding current described in technical scheme 1, is characterised by, described estimation carries out according to the rate of change of described temperature detection value.
The invention of technical scheme 3, on the basis of the guard method of the source of welding current described in technical scheme 1 or 2, is characterised by, carries out described alarm by sound.
The effect of invention
According to the present invention, estimate after the stipulated time, arrive predetermined temperature reference value from the temperature detection value of temperature sensor time, send " temperature will be become after the ×× second exceed " such alarm based on sound etc..Weld job person, owing to being informed in advance before temperature exceedes becoming, therefore can accept this alarm and carry out the change of welding condition while continuing welding, exceeding without becoming temperature even if workpiece is welded to end.Further, since weld job person can be interrupted in the place easily restarting welding, accordingly, it is capable to restart welding after making the source of welding current stop swimmingly.Thus, will not because temperature exceedes force disconnect welding current through-flow, thus causing welding unexpected interruption.Accordingly, because can prevent discarded workpiece or spend more man-hour when restarting and welding, accordingly, it is capable to the protection source of welding current exceedes from utilization rate and causes temperature to exceed such situation, it is possible to suppress the reduction of production efficiency.
Accompanying drawing explanation
Fig. 1 indicates that the sequential chart of the protection control method of the source of welding current involved by embodiments of the present invention.
Fig. 2 is the block diagram of the source of welding current of the protection control method for implementing the source of welding current involved by embodiments of the present invention.
1 welding wire
2 mother metals
3 electric arcs
4 welding torches
5 feed rolls
AR warning judging circuit
Ar alarm signal
Judging circuit is cut off in AS energising
As is energized shutoff signal
DCL direct current reactor
DV drive circuit
Dv drives signal
E output voltage
EA error amplifying circuit
Ea error amplification signal
ED output voltage detecting circuit
Ed voltage sense signal
ER output voltage initialization circuit
Er output voltage setting signal
FC feeding control circuit
Fc feeding control signal
FR feed speed initialization circuit
Fr feed speed setting signal
HD temperature sensing circuit
Hd temperature detection (value/signal)
HDD temperature A/D translation circuit
Hdd temperature detection numeral (value/signal)
Hs Temperature estimate value
HSC Temperature estimate value computing circuit
Hsc Temperature estimate value computing signal
Ht temperature reference value
HTR temperature reference value initialization circuit
Htr temperature reference value setting signal
I1, I2 welding current
Iw welding current
KH warning circuit
ON welding torch switchs
On welds commencing signal
P data number
PM electric power main circuit
The Td persistent period
TDR persistent period initialization circuit
Tdr persistent period setting signal
The Ts sampling period
Vw weldingvoltage
WM feed motor
Δ Hd rate of change
Detailed description of the invention
Below, it is explained with reference to embodiments of the present invention.
The following describes the protection controlling party ratio juris of the source of welding current involved by embodiments of the present invention.In order to protect semiconductor element, transformator, reactor etc. will not to burn out because of heating, in their main body or be arranged around multiple temperature sensor.At this, spy is envisioned for the situation arranging 1 temperature sensor on the radiator needing the semiconductor element carrying out temperature protection to be mounted.Temperature sensor uses critesistor etc..Then, temperature reference value Ht (DEG C) making temperature protection carry out action is set.This temperature reference value Ht is set as big for the temperature detection value Hd value than temperature sensor when using the source of welding current under specified utilization rate.This is so that when using the source of welding current under specified utilization rate, temperature protection does not carry out action.On this basis, it is set as temperature reference value Ht reducing low value than burning out of can preventing from causing because exceeding utilization rate or durability.When the temperature detection value Hd of temperature sensor arrives temperature reference value Ht time (Hd >=Ht), cut off the through-flow of welding current and stop welding.
Every predetermined sampling period Ts, just the temperature detection value Hd from temperature sensor is sampled, detect as digital value.The temperature detection digital value of n-th is set to Hdd (n).Preset duration T d (second).Every sampling period Ts, just carry out, with following formula, the estimated value (hereinafter referred to as Temperature estimate value Hs (n)) that computing have passed through the temperature detection value Hd of the time point after this duration T d from the current point in time sampling of the n-th (time).This estimation is carried out by temperature detection digital value Hdd (n) and rate of change Δ Hd (DEG C/sec) thereof calculating temperature sensor.
Hs (n)=Hdd (n)+Δ Hd Td ... (1) formula
Wherein, Δ Hd=(Hdd (n)-Hdd (n-1))/Ts.Alternatively, it is also possible to according to Hdd (n) ... p data of past of Hdd (n-p) ask for 1 approximate expression, thus carrying out computing rate of change Δ Hd.
Above-mentioned sampling period Ts is such as set as 0.1～5 second degree.Above-mentioned duration T d is for estimating to become the constant that temperature exceedes after determining to light several seconds from current time, for instance be set as 30～180 seconds.By above formula, every sampling period Ts, computing Temperature estimate value Hs.
The protection control method of the source of welding current involved by embodiments of the present invention is carried out by below step.
Step 1: set sampling period Ts, temperature reference value Ht and duration T d.Then, every sampling period Ts, the temperature detection value Hd of temperature sensor is sampled, detect as digital value.The temperature detection digital value of n-th is set to Hdd (n).
Step 2: temperature detection digital value Hdd (n) in n-th arrives during above-mentioned temperature reference value Ht (Hdd (n) >=Ht), makes energising shutoff signal As be changed to high level, cuts off the through-flow of welding current Iw and stops welding.On the other hand, when not up to temperature reference value Ht (Hdd (n) < Ht), energising shutoff signal As keeps low level constant, proceeds the through-flow of welding current Iw.When the shutoff signal As that is energized becomes high level, do not carry out the process of step 3.
Step 3: just carried out Temperature estimate value Hs (n) of computing n-th every sampling period Ts by above-mentioned formula (1), Temperature estimate value Hs (n) in this n-th arrives during above-mentioned temperature reference value Ht (Hs (n) >=Ht), makes alarm signal A r be changed to high level thus sending alarm.According to the mode that weld job person can be identified while carrying out welding, alerted by the sound of " exceeding becoming temperature after the ×× second " etc..The ×× second becomes above-mentioned duration T d.Alternatively, it is also possible to make the clamping part vibration of welding torch send alarm.Can also and with lighting abnormal show lamp.Even if alarm signal A r is changed to high level, also simply sending alarm, welding continues to.
Fig. 1 indicates that the sequential chart of the protection control method of the source of welding current involved by embodiments of the present invention.Fig. 1 (A) represents that welding current Iw, Fig. 1 (B) represent that temperature detection value Hd, Fig. 1 (C) of temperature sensor represent that alarm signal A r, Fig. 1 (D) represent energising shutoff signal As.Fig. 1 is the situation becoming Temperature estimate value Hs >=temperature reference value Ht in above-mentioned steps 3.Below, illustrate with reference to Fig. 1.
As shown in Fig. 1 (A), the period of moment t1～t2 is during welding through-flow for welding current I1, the period of moment t2～t3 is not through-flow the stopping period of welding current Iw, the period of moment t3～t4 is during welding through-flow for welding current I1, the period of moment t4～t5 is period of stopping, the period of moment t5～t6 is during the predetermined welding that welding current I2 is through-flow, and the period of moment t6～t7 is period of stopping.This, I1 < I2.Welding current value, when sacrificial electrode electric arc welds, changes according to the feed speed of welding wire, when non-consumable electrode electric arc welds, is changed by constant current controlling.During each welding and period of stopping be each identical time span.Further, during welding and stop period aggregate value be 10 minutes.
As shown in Fig. 1 (B), period before moment t5 is owing to having carried out welding current I1 through-flow with identical utilization rate, therefore, as shown in Fig. 1 (B), temperature detection value Hd is gradually increasing during the welding of moment t1～t2, it is gradually reduced in the period of stopping of moment t2～t3, is gradually increasing in during the welding of moment t3～t4, be gradually reduced in the period of stopping of moment t4～t5.When the maximum of the temperature detection value Hd before moment t5 is moment t2 and t4.This maximum is lower than the temperature reference value Ht shown in a chain-dotted line.Carrying out the process of above-mentioned steps 1 and 2, energising shutoff signal As keeps low level constant thus Fig. 1 (D) Suo Shi like that.It addition, carry out the process of above-mentioned steps 3, thus the period before moment t5 is in the Temperature estimate value Hs calculated by above-mentioned formula (1) state lower than said temperature reference value Ht.Thus, as shown in Fig. 1 (C), alarm signal A r becomes low level.
As shown in Fig. 1 (A), the welding current that moment t5 rises, due to welding current set point change, therefore increases to I2 from I1.Thus, as shown in Fig. 1 (B), temperature detection value Hd is with the inclination rising from moment t5 during more than moment t1 and t2.Then, moment t51, temperature detection value Hd before the moment t6 that welding terminates are in the state lower than above-mentioned temperature reference value Ht.On the other hand, carry out Temperature estimate value Hs that the process of above-mentioned steps 3 calculates thereby through above-mentioned formula (1) owing to arriving said temperature reference value Ht (Hd >=Ht) in the moment 51, therefore as shown in Fig. 1 (C), alarm signal A r is changed to high level at short notice, sends " will become temperature after the ×× second to exceed " such sound alarm.At this, the ×× second is duration T d.
Can weld job person accepts this alarm, it is judged that till carrying out being welded to end in duration T d (second), if being likely to, does not then continue welding with not changing welding condition.Be judged as can not time, consider welding quality basis on, for instance implement countermeasure as following.
1) translational speed (speed of welding) of welding torch is accelerated, so that can be welded to till end in duration T d.
2) extend until it becomes the time of temperature detection value Hd >=temperature reference value Ht by reducing the value of welding current Iw, so that till end being welded to.
3) before have passed through duration T d, welding is interrupted easily restarting the local of welding.Then, after making the source of welding current stop, welding is restarted swimmingly from this place.
Fig. 1 is weld job, and person accepts alarm, it is judged that for till cannot being welded to end in duration T d, implement above-mentioned 1 at moment t51) shown in the situation of countermeasure of quickening speed of welding.Thus, as shown in Fig. 1 (A), due to the welding finished to end of the moment t52 before welding originally terminates predetermined instant t6, therefore, terminate the through-flow of welding current I2 at moment t52.The period of moment t51～t52 is shorter than the time of duration T d, and the period of moment t51～t6 is the time being longer than duration T d.As shown in Fig. 1 (B), temperature detection value Hd rises till playing moment t52 from moment t5, declines to moment t6 afterwards, declines further in the period of stopping being moment t6～t7.As shown in Fig. 1 (D), energising shutoff signal As keeps low level constant in full period.If when moment t51 receive alarm also keep that welding current I2 is constant, do not continue with accelerating speed of welding to weld, between moment t52 and moment t6, energising shutoff signal As is changed to high level, and welding current Iw's is through-flow cut-off.
Fig. 2 is the block diagram of the source of welding current of the protection control method for implementing the welding current involved by above-mentioned embodiments of the present invention.Fig. 2 is arc-welding process is the situation of sacrificial electrode arc-welding process.Below, with reference to Fig. 2, each side's frame is described.
Electric power main circuit PM is using the source power supply (omitting diagram) of 3 phase 200V etc. as input, and the output carrying out inversion control etc. according to driving signal Dv described later controls, and is exported by output voltage E and welding current Iw.Although eliminating this electric power main circuit PM in the example shown, but it possessing: source power supply to be carried out a rectification circuit of rectification；The capacitor that ripply direct current after rectification is smoothed；Driven, become by the DC converting after smooth the inverter circuit of high-frequency ac by above-mentioned driving signal Dv；High-frequency ac is depressured to the high frequency transformer of the magnitude of voltage being suitable to electric arc welding；With the secondary rectification circuit that the high-frequency ac after blood pressure lowering is carried out rectification.Above-mentioned output voltage E is smoothed by direct current reactor DCL.Welding wire 1 by welding torch 4, thus being fed, produces electric arc 3 by the rotation of feed rolls 5 that is combined with feed motor WM between mother metal 2.Welding torch 4 is gripped by weld job person.Weldingvoltage Vw, through-flow welding current Iw is applied between welding wire 1 and mother metal 2.
Welding torch switch ON (welding torch conducting switch) is located at welding torch 4, if switching it on when weld job person starts to weld, is then output into the welding commencing signal On of high level.
Temperature reference value initialization circuit HTR exports predetermined temperature reference value setting signal Htr.This circuit carries out the process of above-mentioned steps 1.
Temperature sensing circuit HD comprises temperature sensor, output temperature detection signal Hd.This temperature detection signal Hd, every predetermined sampling period Ts, is just carried out A/D conversion output temperature detection digital signal Hdd by temperature A/D translation circuit HDD.These circuit carry out the process of above-mentioned step 1.
Energising cuts off judging circuit AS using above-mentioned temperature detection digital signal Hdd and above-mentioned temperature reference value setting signal Htr as input, value at temperature detection digital signal Hdd arrives the time point of the value (Hdd >=Htr) of temperature reference value setting signal Htr, is output into the energising shutoff signal As of high level.This circuit carries out the process of above-mentioned step 2.
Persistent period initialization circuit TDR exports predetermined persistent period setting signal Tdr.Temperature estimate value computing circuit HSC using this persistent period setting signal Tdr and above-mentioned temperature detection digital signal Hdd as input, every above-mentioned sampling period Ts, just carry out computing Temperature estimate value by above-mentioned formula (1), and it can be used as Temperature estimate value computing signal Hsc to export.Both as input, are compared by warning judging circuit AR by this Temperature estimate value computing signal Hsc and above-mentioned temperature reference value setting signal Htr, thus being changed to the time point output alarm signal Ar of Hsc >=Htr.This alarm signal A r as input, when alarm signal A r is changed to high level, is sent " will become temperature after the ×× second to exceed " such alarm based on sound by warning circuit KH.This warning circuit KH is located at the source of welding current, wire feed unit (diagram is omitted), welding torch 4 etc..Alternatively, it is also possible to as described above, alarm is sent by vibration, abnormal show lamp etc..These circuit carry out the process of above-mentioned steps 3.
Output voltage initialization circuit ER exports predetermined output voltage setting signal.Pulse-like voltage that the output of the secondary side of high frequency transformer is carried out rectification and obtains by output voltage detecting circuit ED detection, i.e. output voltage E (voltage by before direct current reactor DCL), make this detected value by low pass filter (cut-off frequency 1～10Hz degree), and export as voltage sense signal Ed.The error of above-mentioned output voltage setting signal Er Yu this voltage sense signal Ed is amplified by error amplifying circuit EA, and output error amplifies signal Ea.The power supply of constant voltage characteristic is become by this error amplifying circuit.Drive circuit DV using this error amplification signal Ea, above-mentioned welding commencing signal On and above-mentioned energising shutoff signal As input, when welding commencing signal On is high level and energising shutoff signal As is low level, pulse width modulation controlled is carried out according to error amplification signal Ea, the driving signal Dv for driving the inverter circuit in above-mentioned electric power main circuit PM is exported based on its result, when welding commencing signal On is low level and energising shutoff signal As is high level, not output drive signal Dv.This circuit carries out the process of above-mentioned steps 2.By this circuit, owing to stopping the output of the source of welding current when the shutoff signal As that is energized becomes high level, therefore cut off the through-flow of welding current.
Feed speed initialization circuit FR exports predetermined feed speed setting signal Fr.Feeding control circuit FC using this feed speed setting signal Fr, above-mentioned welding commencing signal On and above-mentioned energising shutoff signal As input, when welding commencing signal On is high level and energising shutoff signal As is low level, to above-mentioned feed motor WM output for carrying out the feeding control signal Fc of feeding welding wire 1 with the feed speed suitable with the value of this feed speed setting signal Fr, when welding commencing signal On is low level or energising shutoff signal As is high level, the feeding control signal Fc that output stops for making feeding.This circuit carries out the process of above-mentioned step 2.By this circuit, when the shutoff signal As that is energized is high level, stop the feeding of welding wire 1.
According to above-mentioned embodiment, be estimated as after the predetermined persistent period, arrive predetermined temperature reference value from the temperature detection value of temperature sensor time, send " temperature will be become after the ×× second exceed " such alarm based on sound.Weld job person, owing to being informed in advance before becoming temperature and exceeding, therefore can accept this alarm and carry out the change of welding condition while continuing welding, exceeding without becoming temperature even if workpiece is welded to end.Further, since weld job person can be interrupted in the place easily restarting welding, accordingly, it is capable to restart welding after making the source of welding current stop swimmingly.Thus, will not because temperature exceedes force disconnect welding current through-flow, thus causing welding unexpected interruption.Accordingly, because discarded workpiece can be prevented, spend more man-hour when restarting and welding, thus it is possible to cause temperature to protect on the basis of the source of welding current in exceeding exceeding from utilization rate, it is suppressed that the reduction of production efficiency.
In the above-described embodiment, describe electric arc and be welded as the situation of sacrificial electrode electric arc welding, but the present invention can also be applied in the welding of non-consumable electrode electric arc, plasma-arc welding etc..
Claims (2)
1. the protection control method of a source of welding current; detect the temperature within the source of welding current by temperature sensor, when this temperature detection value arrives predetermined temperature reference value, cut off the through-flow of welding current; the protection control method of the described source of welding current is characterised by
Estimate described temperature detection value after the stipulated time, arrive described temperature reference value time, send alarm,
Described estimation carries out according to the rate of change of described temperature detection value.
2. the protection control method of the source of welding current according to claim 1, it is characterised in that
Described alarm is carried out by sound.
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| JP2012051112A JP2013184192A (en) | 2012-03-08 | 2012-03-08 | Protection control method for welding source |
| JP2012-051112 | 2012-03-08 |
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| CN103302376A CN103302376A (en) | 2013-09-18 |
| CN103302376B true CN103302376B (en) | 2016-07-06 |
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| CN102015187A (en) * | 2009-04-16 | 2011-04-13 | 松下电器产业株式会社 | Welding machine |
| CN201940728U (en) * | 2011-01-06 | 2011-08-24 | 张丽 | Electric welding machine with sound and light alarm and safety protection device |
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| JP2981289B2 (en) * | 1990-12-19 | 1999-11-22 | 日立ビアメカニクス株式会社 | Output overcurrent protection device for arc welding power supply |
| JP2002066738A (en) * | 2000-08-24 | 2002-03-05 | Daihen Corp | Control method and device for fan of arc working welding machine |
| US6791063B2 (en) * | 2002-11-19 | 2004-09-14 | Illinois Tool Works Inc. | Welding-type power supply with thermal management |
| JP5056093B2 (en) * | 2007-03-19 | 2012-10-24 | パナソニック株式会社 | Electrical equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102015187A (en) * | 2009-04-16 | 2011-04-13 | 松下电器产业株式会社 | Welding machine |
| CN201940728U (en) * | 2011-01-06 | 2011-08-24 | 张丽 | Electric welding machine with sound and light alarm and safety protection device |
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