CN2726782Y - Transformer type anti-electric shock device for arc welding machine - Google Patents
Transformer type anti-electric shock device for arc welding machine Download PDFInfo
- Publication number
- CN2726782Y CN2726782Y CN 200420090461 CN200420090461U CN2726782Y CN 2726782 Y CN2726782 Y CN 2726782Y CN 200420090461 CN200420090461 CN 200420090461 CN 200420090461 U CN200420090461 U CN 200420090461U CN 2726782 Y CN2726782 Y CN 2726782Y
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- welding machine
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- electric shock
- arc
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Abstract
The utility model relates to a hazard reducing device, and especially it relates to a transformer type anti-electric shock device for arc welding machine. An ordinary anti-electric shock device for arc welding machine has ubiquitous problems of bad performance of arc strike and unstable arcing in an idle low-idling-voltage, which causes weak practicability of the existing anti-electric shock device for arc welding machine. An excess voltage generated in the exchange process from the idle low-idling-voltage to a normal output voltage can damage a resistance-capacitance, a thyristor, decompression and such decompression elements easily causing the weak reliability. The utility model provides a transformer type anti-electric shock device for arc welding machine composed of a creepage breaker (1), an alternating current contactor (2), a current mutual inductor (3), a reducing transformer (4), and a controlling circuit (5). The utility model overcomes the defects of bad performance and unstable arcing existed in the ordinary anti-electric shock device for arc welding machine and provides a transformer type anti-electric shock device for arc welding machine with strong practicability and high reliability.
Description
Technical field
The utility model relates to a kind of anti-electric shock apparatus, relates in particular to a kind of arc-welding machine anti-electric shock apparatus of transformer type.
Background technology
Arc-welding machine is the main welding equipment in the industries such as industrial and mining enterprises, building industry, shipbuilding industry, machining, uses the electric welder of arc-welding machine, carries out the electric welding operation under the adverse circumstances such as narrow metal structure such as the metallic conduit of being everlasting, hull.About 70～the 80V of normal output voltage of arc-welding machine substantially exceeds the regulation of 24V safe voltage, and electric welder's life security in serious threat.For solving above-mentioned welding safety problem, arc-welding machine must install the anti-electric shock apparatus that reduces unloaded output voltage additional and could use.But the striking performance is bad during general arc-welding machine anti-electric shock apparatus ubiquity low no-load voltage, arcing is unstable, causes the practicality of existing arc-welding machine anti-electric shock apparatus not strong; Damage voltage drop elements such as capacitance-resistance and controllable silicon at low no-load voltage easily to the overvoltage of the handoff procedure generation of normal output voltage, cause its reliability not high.
Summary of the invention
Goal of the invention of the present utility model is to overcome defectives such as the striking performance that above-mentioned arc-welding machine anti-electric shock apparatus exists is bad, arcing instability, and a kind of arc-welding machine anti-electric shock apparatus of practical, transformer type that reliability is high is provided.
The arc-welding machine anti-electric shock apparatus of a kind of transformer type that the utility model provides is made up of RCCB 1, A.C. contactor 2, current transformer 3, step-down transformer 4 and control circuit 5, an output of 3 need of current transformer winding; Step-down transformer 4 by high pressure pay winding 4A, low pressure pays winding 4B and former limit winding 4C forms; One utmost point of RCCB 1 output stage picks out three lead-in wires: one passes the input that arc-welding machine is directly inserted in current transformer 3 backs, it two passes the end that the high pressure of receiving step-down transformer 4 behind the current transformer 3 is paid winding 4A, its three end of receiving the former limit winding 4C of step-down transformer 4, above-mentioned three end points are isopotential point; The other end that high pressure is paid winding 4A is received the normally closed auxiliary contact of A.C. contactor 2, the other end of former limit winding 4C is received another utmost point of RCCB 1, receive the normally open contact of A.C. contactor 2 simultaneously, the public contact of A.C. contactor 2 is received another input of arc-welding machine; The output winding that the low pressure of step-down transformer 4 is paid winding 4B and current transformer 3 is received the input of control circuit 5 respectively.
AC power is through RCCB 1 input, and RCCB is not only as total power switch but also have creepage protection function.
The low pressure of step-down transformer 4 is paid the power supply of winding 4B Access Control circuit 5 as control circuit 5.
The output winding Access Control circuit 5 of current transformer 3 is imported as control signal.
The utility model is installed in the input of arc-welding machine, and arc-welding machine the utility model when standby is supplied with the about 70V of its input voltage, and no-load current is very little, and the control signal that current transformer 3 is defeated by control circuit 5 is also very little.When in case the electric welder contacts weldment preparation striking with welding rod, electric current increases suddenly, control circuit 5 receives the impact signal of current transformer 3 inputs, connect 12V DC relay 9 by 555 time base circuits 8 in the control circuit 5 immediately, then drive the coil of A.C. contactor 2, make the supply voltage of arc-welding machine be converted to 380V by about 70V.Regulate 555 time base circuits 8,12V DC relay 9 suitable time-delays are discharged, can guarantee the stability of the quick starting the arc and arcing.
The about 70V of input voltage when the utility model makes arc-welding machine zero load standby, unloaded output voltage is less than 24V.In case the arc-welding machine input voltage automatically switches to 380V immediately during welding, this moment, its output voltage also rose to about 70～80V immediately.
Because the specific connected mode of current transformer 3 makes arc-welding machine current transformer 3 when the low-voltage starting the arc obtain bigger current ratio, has strengthened enabling signal, makes arc-welding machine in low-voltage, hour still starting the arc fast of striking electric current, has improved the striking performance; And when welding current transformer 3 transfer the less current ratio to and prevent that current transformer 3 supersaturation from damaging; The suitable time-delay function of 555 type time base circuits 8 in the control circuit 5 obviously improves the arcing stability after the arc-welding machine starting the arc.Adopt step-down transformer 4 to be easy to its shock-resistant voltage is brought up to more than the 4000V, reduced the damage ring rate of voltage drop element as voltage drop element.The switching of arc-welding machine input voltage only realizes by a power line, also is that whole main contacts of A.C. contactor 2 are used for changing a power line, has made full use of the capacity of A.C. contactor main contact.
Description of drawings
Fig. 1 is a principle schematic of the present utility model
Fig. 2 is the principle schematic of control circuit 5
The specific embodiment
Embodiment 1
As shown in Figure 1, a kind of arc-welding machine anti-electric shock apparatus of transformer type is made up of RCCB 1, A.C. contactor 2, current transformer 3, step-down transformer 4 and control circuit 5, an output of 3 need of current transformer winding; Step-down transformer 4 by high pressure pay winding 4A, low pressure pays winding 4B and former limit winding 4C forms; AC power is through RCCB 1 input, one utmost point of RCCB 1 output stage picks out three lead-in wires: one passes the input that arc-welding machine is directly inserted in current transformer 3 backs, the high pressure of receiving step-down transformer 4 behind its two strings overcurrent transformer 3 is paid the end of winding 4A, its three end of receiving the former limit winding 4C of step-down transformer 4, above-mentioned three end points are isopotential point; The other end that high pressure is paid winding 4A is received the normally closed auxiliary contact of A.C. contactor 2, the other end of former limit winding 4C is received another utmost point of RCCB 1, receive the normally open contact of A.C. contactor 2 simultaneously, the public contact of A.C. contactor 2 is received another input of arc-welding machine; The output winding that the low pressure of step-down transformer 4 is paid winding 4B and current transformer 3 is received the input of control circuit 5 respectively.
Claims (2)
1, a kind of arc-welding machine anti-electric shock apparatus of transformer type, it is characterized in that it is made up of RCCB (1), A.C. contactor (2), current transformer (3), step-down transformer (4) and control circuit (5), current transformer (3) only needs an output winding; Step-down transformer (4) by high pressure pay winding (4A), low pressure pays winding (4B) and former limit winding (4C) is formed; One utmost point of RCCB (1) output stage picks out three lead-in wires: one passes the input that arc-welding machine is directly inserted in current transformer (3) back, it two passes the end that the high pressure of receiving step-down transformer (4) behind the current transformer (3) is paid winding (4A), its three end of receiving the former limit winding (4C) of step-down transformer (4), above-mentioned three end points are isopotential point; The other end that high pressure is paid winding (4A) is received the normally closed auxiliary contact of A.C. contactor (2), the other end of former limit winding (4C) is received another utmost point of RCCB (1), receive the normally open contact of A.C. contactor (2) simultaneously, the public contact of A.C. contactor (2) is received another input of arc-welding machine; The low pressure of step-down transformer (4) is paid the output winding of winding (4B) and current transformer (3) and is received the input of control circuit (5) respectively.
2, the arc-welding machine anti-electric shock apparatus of a kind of transformer type according to claim 1, it is characterized in that control circuit (5) wherein comprises two rectification circuits (6), shaping circuit (7), time base circuit (8) and 12V DC relay (9), two rectification circuits (6) are connected with the output winding that the low pressure of step-down transformer (4) is paid winding (4B) and current transformer (3) respectively, and the 12V DC relay (9) in the control circuit (5) drives the coil of A.C. contactor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420090461 CN2726782Y (en) | 2004-09-24 | 2004-09-24 | Transformer type anti-electric shock device for arc welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420090461 CN2726782Y (en) | 2004-09-24 | 2004-09-24 | Transformer type anti-electric shock device for arc welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2726782Y true CN2726782Y (en) | 2005-09-21 |
Family
ID=35042805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420090461 Expired - Fee Related CN2726782Y (en) | 2004-09-24 | 2004-09-24 | Transformer type anti-electric shock device for arc welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2726782Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985872A (en) * | 2022-05-31 | 2022-09-02 | 中铁隧道局集团建设有限公司 | AC arc welding machine and one-time end power-off protection device thereof |
-
2004
- 2004-09-24 CN CN 200420090461 patent/CN2726782Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985872A (en) * | 2022-05-31 | 2022-09-02 | 中铁隧道局集团建设有限公司 | AC arc welding machine and one-time end power-off protection device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050921 Termination date: 20120924 |