CN209986390U - Safety system of electric welding machine - Google Patents
Safety system of electric welding machine Download PDFInfo
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- CN209986390U CN209986390U CN201920045206.4U CN201920045206U CN209986390U CN 209986390 U CN209986390 U CN 209986390U CN 201920045206 U CN201920045206 U CN 201920045206U CN 209986390 U CN209986390 U CN 209986390U
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Abstract
The utility model discloses an electric welding safety coefficient is provided, it includes interconnect's electric welding main circuit (1) and safety control circuit (2), and electric welding main circuit (1) includes electric welding casing and device electric welding main part, ac contactor and contactor switch component and circuit, safety control circuit (2) in the casing, safety control circuit (2) include singlechip, live wire photoelectricity coupled circuit, zero line photoelectricity coupled circuit, normal work pilot lamp, unusual alarm indicator lamp, audio alert device, relay switch contact is established ties in the ac contactor actuation return circuit, during the relay received the electric action, ac contactor can not the actuation for the electric welding power supply. Under normal conditions, the operation button of the alternating current contactor is operated, the electric welding machine works normally, and under abnormal conditions, the operation button of the alternating current contactor is operated, and the safety system of the electric welding machine immediately gives out sound and light alarm and immediately interrupts a power supply.
Description
Technical Field
The utility model relates to an electric shock protection field especially relates to an electric welding safety coefficient.
Background
Welding machines are among the most dangerous electrical devices in the world, since the welder or operator must often be positioned between two exposed electrical conductors, the first being the ground and the second being the welding torch, including the electrode holder, the welding gun, etc. The ground wire is typically connected to the welding workpiece and current flows from one end of the welder through the weld wire, torch, workpiece, ground wire to the other end of the welder. The open circuit voltage of the welding machine is generally above 60V, and the working voltage is mostly less than 36V, so that the electric shock accident of the welding machine generally occurs in the standby state of the welding machine. Electric shock safety protection measures of an electric welding machine are generally 1, overvoltage power-off protection; 2. the input end of the power supply is provided with an electric shock protection switch; 3. electronic detection of shock protection devices, etc. These measures are often wrong due to the fact that the electric welding machine is in a square state, and accidents that people get electric shock and die still happen occasionally due to accidents. Therefore, the sound-light alarm and electric shock condition loss device is arranged on the electric welding machine or a position which is easy to touch frequently, and the event that people are injured by electric shock can be greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough, provide an electric welding safety coefficient that has audible-visual annunciation and is difficult for producing the condition of electric shock.
The utility model adopts the technical proposal that: a safety system of electric welder is composed of main circuit of electric welder consisting of casing, main body of electric welder, AC contactor, switch element, circuit and safety control circuit, the main circuit of the electric welding machine is connected with a safety control circuit, the input end of a main contact of the alternating current contactor is connected with a power supply, the main contact output end of the alternating current contactor is connected with the input end of the electric welding machine main body, the contactor switch element and the circuit control the electric welding machine main body and the safety control circuit to work in a power receiving state, under the normal condition, and operating an operating button of the alternating current contactor to normally work, and operating the operating button of the alternating current contactor under abnormal conditions to immediately send out a sound-light alarm and immediately interrupt a power supply.
The safety control circuit comprises a single chip microcomputer, a live wire photoelectric coupling circuit, a zero line photoelectric coupling circuit, a normal work indicator lamp, an abnormal alarm indicator lamp, a voice alarm device and a relay, wherein the input end of the live wire photoelectric coupling circuit is connected with the live wire and the electric welding machine shell, the input end of the zero line photoelectric coupling circuit is connected with the zero line and the electric welding machine shell, the output end of the live wire photoelectric coupling circuit is connected with the output end of the zero line photoelectric coupling circuit and the input end of the single chip microcomputer, and the output end of the single chip microcomputer is correspondingly connected with the normal work indicator lamp, the abnormal alarm indicator lamp, the voice alarm device and the relay coil.
The alternating current contactor and the contactor switch element and the circuit comprise the relay switch contact, the relay switch contact is connected in series in the pull-in loop circuit of the alternating current contactor, and when the relay is powered on, the alternating current contactor cannot pull in.
The live wire photoelectric coupling circuit comprises a first diode, a second resistor, a third resistor, a fourth resistor, a first photoelectric couple and a first capacitor, wherein the anode of the first diode is connected with a live wire, the cathode of the first diode is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the anode of the first photoelectric couple lighting tube, the cathode of the first photoelectric couple lighting tube is connected with the electric welding machine shell, the collector of the first photoelectric couple switching tube is connected with one input end of the single chip microcomputer and one end of the second resistor, the other end of the second resistor is connected with a power supply VDD, the emitter of the first photoelectric couple switching tube is connected with a common ground GND, the first capacitor is connected between the emitter and the collector of the first photoelectric couple switching tube in parallel, and the zero wire photoelectric coupling circuit comprises a second diode, a second resistor, a third resistor, a fourth resistor, a third resistor and a first capacitor, The electric welding machine comprises a sixth resistor, a seventh resistor, an eighth resistor, a second photoelectric couple and a second capacitor, wherein the anode of a second diode is connected with the electric welding machine shell, the cathode of the second diode is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with the anode of a second photoelectric couple lighting tube, the cathode of the second photoelectric couple lighting tube is connected with a zero line, the collector of the second photoelectric couple switching tube is connected with the other input end of the single chip microcomputer and one end of the fifth resistor, the other end of the sixth resistor is connected with a power supply VDD, the emitter of the second photoelectric couple switching tube is connected with a common ground GND, and the second capacitor is connected between the emitter and the collector of the second photoelectric couple switching tube in parallel.
The utility model has the advantages that: because the utility model comprises an electric welding machine main circuit and a safety control circuit, the electric welding machine main circuit comprises an electric welding machine shell, an electric welding machine main body, an alternating current contactor, a contactor switch element, a circuit and a safety control circuit which are arranged in the shell, the main circuit of the electric welding machine is connected with a safety control circuit, the input end of a main contact of the alternating current contactor is connected with a power supply, the main contact output end of the alternating current contactor is connected with the input end of the electric welding machine main body, the contactor switch element and the circuit control the electric welding machine main body and the safety control circuit to work in a power receiving state, under the normal condition, and operating an operating button of the alternating current contactor to normally work, and operating the operating button of the alternating current contactor under abnormal conditions to immediately send out a sound-light alarm and immediately interrupt a power supply. Safety control circuit includes singlechip, live wire photoelectric coupling circuit, zero line photoelectric coupling circuit, normal work pilot lamp, unusual alarm indicator lamp, audio alert device, relay, include in ac contactor and contactor switch component and the circuit relay switch contact, relay switch contact establishes ties in the ac contactor actuation return circuit, when the relay receives the electrical action, ac contactor can not the actuation. Therefore, the utility model has the functions of sound and light alarm and automatic power off, and can effectively reduce the incidence of electric shock accidents.
Drawings
Fig. 1 is a schematic diagram of the circuit principle structure of the present invention.
Detailed Description
As shown in figure 1, the utility model comprises an electric welding machine main circuit 1 and a safety control circuit 2, wherein the electric welding machine main circuit 1 comprises an electric welding machine shell, an electric welding machine main body arranged in the shell, an alternating current contactor, a contactor switch element, a circuit and a safety control circuit 2, the main circuit 1 of the electric welding machine is connected with a safety control circuit 2, the input end of a main contact of the alternating current contactor is connected with a power supply, the main contact output end of the alternating current contactor is connected with the input end of the electric welding machine main body, the contactor switch element and the circuit control the electric welding machine main body and the safety control circuit 2 to work in a power receiving state, under the normal condition, and operating an operating button of the alternating current contactor to normally work, and operating the operating button of the alternating current contactor under abnormal conditions to immediately send out a sound-light alarm and immediately interrupt a power supply.
The alternating current contactor and the contactor switch element and the circuit comprise the relay switch contact, the relay switch contact is connected in series in the pull-in loop circuit of the alternating current contactor, and when the relay is powered on, the alternating current contactor cannot pull in.
The live wire photoelectric coupling circuit comprises a first diode D1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first photoelectric couple OC1 and a first capacitor C1, wherein the anode of the first diode D1 is connected with a live wire, the cathode of the first diode D1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with the anode of the first photoelectric couple OC1, the cathode of the first photoelectric couple OC 1-luminous tube is connected with the electric welding machine shell, the collector of the first photoelectric couple OC1 switching tube is connected with the input end of the single chip microcomputer, one end of the second resistor R2, the other end of the second resistor R2 is connected with a power supply VDD, the emitter of the first photoelectric couple OC1 switching tube is connected with a circuit common ground, the collector of the first photoelectric couple OC1 is connected with the emitter of the first capacitor C1 in parallel, the zero line photoelectric coupling circuit comprises a second diode D2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second photoelectric couple OC2 and a second capacitor C2, the anode of the second diode D2 is connected to the electric welder housing, the cathode of the second diode D2 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected with the anode of the second photoelectric couple OC2 luminotron, the negative electrode of the second photoelectric couple OC2 luminotron is connected with a zero line, the collector electrode of the second photoelectric couple OC2 switching tube is connected with the other input end of the singlechip and one end of the fifth resistor R5, the other end of the sixth resistor R6 is connected with a power supply VDD, the emitter of the second photoelectric couple OC2 switching tube is connected with the circuit common ground GND, the emitter and the collector of the second photoelectric couple OC2 switching tube are connected in parallel with the second capacitor C2.
In this embodiment, the inventor designs a special leakage detection device for the no-load leakage of the welding machine, and the implementation method thereof is as follows:
1. and a micro-current Hall element is arranged on any output welding cable of the electric welding machine, the output current is detected, and when the detected current of the CPU is less than 2ma, the leakage protection system of the electric welding machine is normal.
2. When the current is between 2 and 20ma, the system is at a safe level and can be used normally.
3. If the current is between 20 and 1000ma, which can be defined as an electric shock accident, the device will cut off the power supply within the set time.
4. If the current exceeds 1000ma or is more than 1000ma within the set time, the device is judged to be in a normal working state, and the system works normally.
The principle is as follows:
1. the general person-placing electric shock of the electric welding machine is that the open circuit voltage is higher than 36V, most of the electric shock is above 60V, the alternating current welding machine is normally higher than 80V, when the welding machine is raining or sweaty, the resistance of the whole body is reduced, even lower than 300 Ω, if the welding torch leaks electricity due to reasons at the moment, the leakage current value is 80V/300 Ω =260ma, if the voltage is too 60V, the resistance is 600 Ω, the leakage current also has 100ma, and is far greater than 30ma which can be born by a human body, when the current Hall detects that the current is between 30ma and 2000ma, the CPU immediately informs a power supply circuit to cut off the power supply, and the personal safety is guaranteed.
2. When the current is larger than 2000ma, the open-circuit voltage of the electric welding machine does not exceed 120V, so that the multiple leakage current =120V/300 Ω =400ma to the human body, and exceeds 2000ma, the device can be judged to be normal, and the welding operation can be continued.
3. In order to ensure the normal work of the leakage switch, the circuit is additionally provided with current-related resistors which are arranged at two ends of the output, the current is calculated and adjusted within 20ma, when the cpu detects the current, the welding machine can continue to work, otherwise, the protection circuit is failed, and the welding machine cannot be used.
Claims (4)
1. The utility model provides an electric welding safety coefficient, it includes electric welding main circuit (1), safety control circuit (2), electric welding main circuit (1) includes that electric welding casing and device are in electric welding main part, ac contactor and contactor switch element and circuit, safety control circuit (2) in the casing, its characterized in that: electric welding main circuit (1) is connected with safety control circuit (2), ac contactor's main contact input end connects the power supply, ac contactor's main contact output is connected electric welding main part input, contactor switch element and line control the electric welding main part with safety control circuit (2) work is received the electric state, under the normal condition, the operation ac contactor's operating button the electric welding is normally worked, and abnormal condition operation this electric welding safety system of ac contactor's operating button sends audible-visual alarm immediately and immediately carves the interrupt power supply.
2. The welding welder safety system of claim 1, wherein: safety control circuit (2) include singlechip, live wire photoelectric coupling circuit, zero line photoelectric coupling circuit, normal work pilot lamp, unusual alarm indicator, audio alert device, relay, the live wire of input connection of live wire photoelectric coupling circuit with the electric welding casing, the zero line of input connection of zero line photoelectric coupling circuit with the electric welding casing, the output of live wire photoelectric coupling circuit the output of zero line photoelectric coupling circuit all connects the singlechip input, the singlechip output corresponds the connection normal work pilot lamp, unusual alarm indicator, audio alert device, relay coil.
3. The welding welder safety system of claim 2, wherein: the alternating current contactor and the contactor switch element and the circuit comprise relay switch contacts, the relay switch contacts are connected in series in the pull-in loop circuit of the alternating current contactor, and when the relay is powered on, the alternating current contactor cannot pull in.
4. The welding welder safety system of claim 2, wherein: the live wire photoelectric coupling circuit comprises a first diode (D1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a first photoelectric couple (OC 1) and a first capacitor (C1), wherein the positive electrode of the first diode (D1) is connected with a live wire, the negative electrode of the first diode (D1) is connected with one end of the third resistor (R3), the other end of the third resistor (R3) is connected with one end of the fourth resistor (R4), the other end of the fourth resistor (R4) is connected with the positive electrode of the first photoelectric couple (OC 1), the negative electrode of the first photoelectric couple (OC 1) is connected with the electric welding machine shell, the collector electrode of the first photoelectric couple (OC 1) switch tube is connected with the input end of the single chip microcomputer, one end of the second resistor (R2), the other end of the second resistor (R2) is connected with a power supply, and the emitter electrode of the first photoelectric couple (OC 1) is connected with a GND circuit, the first capacitor (C1) is connected in parallel between the emitter and the collector of the switching tube of the first photoelectric couple (OC 1), the zero line photoelectric coupling circuit comprises a second diode (D2), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a second photoelectric couple (OC 2) and a second capacitor (C2), the anode of the second diode (D2) is connected with the electric welding machine housing, the cathode of the second diode (D2) is connected with one end of the seventh resistor (R7), the other end of the seventh resistor (R7) is connected with one end of the eighth resistor (R8), the other end of the eighth resistor (R8) is connected with the anode of the light-emitting tube of the second photoelectric couple (OC 2), the cathode of the second photoelectric couple (OC 2) is connected with the zero line, and the collector of the switching tube of the second photoelectric couple (OC 2) is connected with the input light-emitting tube of the single chip microcomputer, One end of a fifth resistor (R5), the other end of the sixth resistor (R6) is connected with a power supply VDD, an emitter of the second photoelectric couple (OC 2) switching tube is connected with a circuit common ground GND, and the second capacitor (C2) is connected in parallel between an emitter and a collector of the second photoelectric couple (OC 2) switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920045206.4U CN209986390U (en) | 2019-01-11 | 2019-01-11 | Safety system of electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920045206.4U CN209986390U (en) | 2019-01-11 | 2019-01-11 | Safety system of electric welding machine |
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| Publication Number | Publication Date |
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| CN209986390U true CN209986390U (en) | 2020-01-24 |
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| CN201920045206.4U Active CN209986390U (en) | 2019-01-11 | 2019-01-11 | Safety system of electric welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109676217A (en) * | 2019-01-11 | 2019-04-26 | 杨卫珍 | A kind of electric welding machine security system |
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2019
- 2019-01-11 CN CN201920045206.4U patent/CN209986390U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109676217A (en) * | 2019-01-11 | 2019-04-26 | 杨卫珍 | A kind of electric welding machine security system |
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