Electromagnetic environment high-voltage isolator for gun head of handheld laser welding machine

Abstract

An electromagnetic environment high-voltage isolator for a handheld laser welding machine gun head comprises a power module, a signal generator, an XNOR gate module, an input module and an output module, the power module is connected with the signal generator and the input module, and the output end of the signal generator is connected with the input end through a first optical coupler isolation module. The output end of the signal generator is connected with the input end of the XNOR gate module, the input end of the input module is connected with a handheld laser welding machine welding gun, the output end of the input module is connected with a second optical coupler isolation module and a third optical coupler isolation module, and the second optical coupler isolation module is connected with the input end of the XNOR gate module. The third optical coupler isolation module is connected with the input end of the output module, the output end of the XNOR gate module is connected with the input end of the output module, and the output end of the output module is connected with the handheld welding machine controller. According to the utility model, the problem of isolation control in a complex electromagnetic environment in which high voltage, low voltage, direct current and random high and low frequency alternating current exist at the same time is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser welding machine technical field, concretely is a kind of electromagnetic environment high-voltage isolator for handheld laser welding machine gun head. BACKGROUND

[0002] With the output power of laser, beam quality, stability, cost performance all make great promotion, so that laser equipment can handle more complex tasks, expand the application range, such as laser welding industry new darling: handheld laser welding machine;Meet people's fine, light, simple and efficient environmental protection welding requirements, and other traditional welding machine appears with its actual application situation, and more complex situation appears, different brand, different type, different power traditional welding machine, lead to extremely complex electromagnetic environment, interfere with laser welding machine normal welding, in order to solve this problem, develop a kind of handheld laser welding machine gun head complex electromagnetic environment high-voltage isolator, solve the difficult problem of isolation control under the complex electromagnetic environment of high voltage, low voltage, direct current, random high-low frequency alternating current.

[0003] At present, isolator has:

[0004] Electromagnetic relay;It is a kind of isolation device using electromagnetic principle. It contains an electromagnet and a movable magnetic pole, when the electromagnet is electrified, the magnetic pole will be attracted to move, so as to complete the on-off control of circuit, the disadvantage is slow response speed, short service life.

[0005] Signal isolator module based on electromagnetic induction principle;It adopts special electromagnetic induction structure and circuit design, and input signal is transmitted to output end through electromagnetic coupling, while realizing electrical isolation between input and output. The disadvantage is that the isolation method is simple, and the isolation capacity is low, and when encountering stronger interference source, it will fail, and when encountering interference source and input signal that needs to be passed, it will affect the normal work of equipment.

[0006] Current transformer;It is a kind of electromagnetic device for measuring and isolating alternating current. Its working principle is based on electromagnetic induction, and the large current of primary side is converted into small current of secondary side through electromagnetic coupling, so as to measure and control;The disadvantage is that when small current direct current signal needs to be input, it cannot pass through.

[0007] Signal isolation transformer: commonly used in audio equipment, such as sound system, broadcast equipment, etc. Because audio signal has different voltage, impedance and other characteristics, audio signal isolation transformer can transmit and isolate signals between different audio circuits, prevent signal interference between different circuits, and ensure the quality of audio signal;The disadvantage is that when small current direct current signal needs to be input, it cannot pass through.

[0008] Optocoupler isolation: optocoupler isolation is a signal isolation technology using an optical coupler; the optical coupler is composed of a light-emitting diode (LED) and a photosensitive device (such as a photosensitive triode, a photosensitive diode, etc.) packaged in the same tube. When the input end is powered, the light-emitting diode emits light, and the photosensitive device receives the light to generate a photoelectric current, which is then amplified and flows out from the output end, thereby completing the "electric-optical-electric" conversion. Since the input and output ends are coupled by optical signals, there is no direct electrical connection, so signal isolation transmission is achieved. The disadvantage is that electricity is still needed for control, and the provision of electricity requires electrical isolation, which cannot solve the root problem. SUMMARY

[0009] In order to solve the above technical problems, the application provides an electromagnetic environment high-voltage isolator for a handheld laser welding machine gun head.

[0010] In order to solve the above technical problems, the application adopts the following technical solutions:

[0011] An electromagnetic environment high-voltage isolator for a handheld laser welding machine gun head, comprising a power supply module, a signal generator, an exclusive OR gate module, an input module and an output module, the power supply module being connected with the signal generator and the input module, the output end of the signal generator being connected with the input end through a first optocoupler isolation module, the output end of the signal generator being connected with the input end of the exclusive OR gate module, the input end of the input module being connected with a handheld laser welding machine welding gun, the output end of the input module being connected with a second optocoupler isolation module and a third optocoupler isolation module, the second optocoupler isolation module being connected with the input end of the exclusive OR gate module, the third optocoupler isolation module being connected with the input end of the output module, the output end of the exclusive OR gate module being connected with the input end of the output module, and the output end of the output module being connected with a handheld welding machine controller.

[0012] As a further improvement, the power supply module comprises a high-voltage isolation DC-DC power supply A and a high-voltage isolation DC-DC power supply B; the high-voltage isolation DC-DC power supply B is connected with the high-voltage isolation DC-DC power supply A and the signal generator, and after being connected with a 24V external power supply, the high-voltage isolation DC-DC power supply B is converted into a direct current 5V power supply to supply power to the high-voltage isolation DC-DC power supply A and the signal generator; the high-voltage isolation DC-DC power supply A is connected with the input module to supply power to the input module.

[0013] As a further improvement, the signal generator comprises a chip U11, an optocoupler U12 and an optocoupler U16, the chip U11 is connected with an adjusting resistor RP1, one end of the adjusting resistor RP1 is connected with a resistor R3 and the other end is connected with a resistor R6, the chip U11 is connected with a capacitor C1 and a capacitor C2, the output pin of the chip U11 is connected with a resistor R7 and a resistor R23 arranged in parallel, the resistor R7 is connected with the optocoupler U12 and the resistor R23 is connected with the optocoupler U16, the optocoupler U12 is connected with the first optocoupler isolation module and the optocoupler U16 is connected with the XNOR gate module.

[0014] As a further improvement, the XNOR gate module comprises a 4-channel 2-input NAND gate logic chip U19 and a transistor Q3, the input end of the NAND gate logic chip U19 is connected with a resistor R16 and a resistor R17, the output end of the NAND gate logic chip U19 is connected with a resistor R15 and a resistor R21, the resistor R21 is connected with the base of the transistor Q3 through a resistor R14, the collector of the transistor Q3 is connected with the resistor R15, the emitter of the transistor Q3 is connected with a resistor R20, the resistor R20 is connected with the resistor R14 and the resistor R21, the capacitor C3 is connected between the base and the emitter of the transistor Q3 and grounded.

[0015] As a further improvement, the input module comprises a safety loop and a trigger loop which are independent of each other, when the safety loop and the trigger loop both detect signals, the laser is emitted outward.

[0016] As a further improvement, the input module comprises high-voltage isolation power supply U1, high-voltage isolation power supply U2 and high-voltage isolation power supply U4 connected with each other, high-voltage isolation power supply U1 is connected with self-resetting fuse F2, high-voltage isolation power supply U4 is connected with self-resetting fuse F3, high-voltage isolation power supply U2 is connected with voltage stabilizing diode D1, high-voltage isolation power supply U4 is connected with the emitter of triode Q1, the collector of triode Q1 is connected with self-resetting fuse F4, electrostatic and surge protector D5 through voltage stabilizing diode U10 and diode D10 respectively, electrostatic and surge protector D5 is connected with self-resetting fuse F3, high-voltage isolation power supply U4 and capacitor U14, capacitor U14 is connected with the emitter of triode Q1, high-voltage isolation power supply U2 is connected with capacitor U9, high-voltage isolation power supply U1 is connected with electrostatic and surge protector D11 through voltage stabilizing diode U7 and diode D9, electrostatic and surge protector D11 is connected with capacitor U15, capacitor U15 is connected with electrostatic and surge protector D11 and voltage stabilizing diode U7, the collector of triode Q1 is connected with photoelectric coupler U5 through resistor R4, resistor R4 is connected with light emitting diode LED3 through resistor R1, high-voltage isolation power supply U1 is connected with resistor R5, resistor R5 is connected with photoelectric coupler U6, resistor R5 is connected with light emitting diode LED2 through resistor R2, self-resetting fuse F4, F2 and F3 are connected with connector CN2, and connector CN2 is also connected with self-resetting fuse F1.

[0017] As a further improvement, the output module comprises four jumpers J3, J4, J5 and J6, jumper J3 is connected with jumper J4, jumper J3 and jumper J4 are connected with photoelectric coupler U17, jumper J4 is connected with jumper J6, jumper J5 is connected with jumper J6, and jumper J3, J4, J5 and J6 are connected with connector CN4.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] Two independent circuits of safety loop and trigger loop are arranged in the input module, when signals of the two safety loops and trigger loops are detected, the handheld laser welding machine can be allowed to emit laser, and the safety and reliability are improved. The power supply is provided in series isolation power supply module mode, the extreme high voltage condition is coped with, the signal comparison mode is adopted, the signal is compared to detect whether it is external interference or safety loop electric signal, and the accurate processing of the signal is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is module principle schematic drawing of the utility model;

[0021] Figure 2 It is circuit principle schematic drawing of signal generator in the utility model;

[0022] Figure 3 It is the circuit principle schematic view of the EXCLUSIVE-OR gate module in the utility model;

[0023] Figure 4 It is the circuit principle schematic view of the input module in the utility model;

[0024] Figure 5 It is the circuit principle schematic view of the output module in the utility model. DETAILED DESCRIPTION

[0025] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0026] In the description of the present application, it should be understood that, if there are terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0027] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] As Figures 1-5The electromagnetic environment high-voltage isolator for the handheld laser welding machine gun head comprises a power module, a signal generator, an exclusive-N gate module, an input module and an output module, the power module is connected with the signal generator and the input module, the output end of the signal generator is connected with the input end through a first optical coupling isolation module, the output end of the signal generator is connected with the input end of the exclusive-N gate module, the input end of the input module is connected with the handheld laser welding machine welding gun, the output end of the input module is connected with a second optical coupling isolation module and a third optical coupling isolation module, the second optical coupling isolation module is connected with the input end of the exclusive-N gate module, the third optical coupling isolation module is connected with the input end of the output module, the output end of the exclusive-N gate module is connected with the input end of the output module, and the output end of the output module is connected with the handheld welding machine controller. When external interference sources enter the complex electromagnetic environment isolator from the input end in any type and path, the external interference sources are current-limited and voltage-limited, are removed, and are finally blocked or consumed; and the required signals can normally flow in and out and are not affected. The input module has a safety loop and a trigger loop which are independent of each other.

[0029] The power module comprises a high-voltage isolation DC-DC power supply A and a high-voltage isolation DC-DC power supply B; the high-voltage isolation DC-DC power supply B is connected with the high-voltage isolation DC-DC power supply A and the signal generator, and is converted into a direct-current 5V power supply after being connected with a 24V external power supply, so as to supply power to the high-voltage isolation DC-DC power supply A and the signal generator; the high-voltage isolation DC-DC power supply A is connected with the input module to supply power to the input module. The high-voltage isolation DC-DC power supply A supplies power to the input module; external interference sources are input from the input module, and a PWM signal input and output are also input from the input module; the PWM signal is generated by the signal generator, is output to the input module through the first optical coupling isolation module, is input to the second optical coupling isolation by the input module, and is input to the exclusive-N gate module by the second optical coupling isolation and the signal generator, is processed by the exclusive-N gate module, is output to the output module, and the output module transmits the signal to the handheld laser welding machine controller, so that the electromagnetic isolation function is achieved. The power supply is composed of the high-voltage isolation DC-DC power supply A and the high-voltage isolation DC-DC power supply B, provides a doubled isolation effect, the interference source voltage is as high as several thousand volts, the single isolation effect is poor, and the complete isolation effect cannot be achieved, and in addition, most industrial controllers are powered by 24V in most cases, so that the double high-voltage isolation DC-DC power supply is more reliable and stable.

[0030] The signal generator adopts 555 chip to generate PWM signal with 50% duty cycle, and the signal is output to input A loop and XNOR gate module by two isolated optocouplers respectively, so as to compare the signals in the XNOR gate module. The signal generator comprises chip U11, optocoupler U12 and optocoupler U16, the chip U11 is connected with adjusting resistor RP1, one end of the adjusting resistor RP1 is connected with resistor R3, and the other end is connected with resistor R6, the chip U11 is connected with capacitor C1 and capacitor C2, the output pin of the chip U11 is connected with resistor R7 and resistor R23 arranged in parallel, the resistor R7 is connected with the optocoupler U12, the resistor R23 is connected with the optocoupler U16, the optocoupler U12 is connected with the first optocoupler isolation module, the optocoupler U16 is connected with the XNOR gate module, one end of the optocoupler U12 is connected with ground through resistor R8, the adjusting resistor RP1 can be adjusted in resistance, and the chip U11 is supplied with 5V power supply by the power supply module.

[0031] After the power is connected, the chip U11 outputs the same PWM signal to the optocoupler U12 and optocoupler U16 along the resistor R7 and resistor R23 respectively through the adjustment of the resistor RP1, the optocoupler U12 inputs the PWM signal to the safety loop of the input module, and the optocoupler U16 provides the standard PWM signal to the XNOR gate module.

[0032] The interference can be reduced by transmitting the PWM signal to the input module. If the safety loop in the input module adopts low-voltage direct-current voltage signal or low-voltage direct-current current signal, the external interference source is also direct-current voltage signal or direct-current current signal, so that an error occurs, which leads to the misoperation of the handheld laser welding machine, and may cause serious safety accidents. The PWM signal frequency is adjustable, and the specific PWM signal interference source can be avoided.

[0033] When the electromagnetic, electrostatic and surge interference signals are input to one end of the XNOR gate along the second optocoupler isolation, and the signals are inconsistent with the standard PWM signal input to the other end from the signal generator, the XNOR gate module outputs low level. When the safety clamp is in contact with the welding gun, the safety loop PWM signal is also input to the XNOR gate along the second optocoupler isolation, at this time, the input signals of the two input ports of the XNOR gate are consistent, and the XNOR gate outputs high level. The XNOR gate module comprises 1 4-channel 2-input NAND gate logic chip U19 and transistor Q3, the input end of the NAND gate logic chip U19 is connected with resistor R16 and resistor R17, the output end of the NAND gate logic chip U19 is connected with resistor R15 and resistor R21, the resistor R21 is connected with the base of the transistor Q3 through resistor R14, the collector of the transistor Q3 is connected with the resistor R15, the emitter of the transistor Q3 is connected with the resistor R20, the resistor R20 is connected with the resistor R14 and resistor R21, and the capacitor C3 is connected between the base and the emitter of the transistor Q3 and grounded.

[0034] The signal inputted along the resistor R16 includes external interference signal, the standard PWM signal is inputted along the resistor R17, is compared after logic operation through the chip U19, is divided in turn through the resistor R21 and the resistor R20, is limited through the resistor R14, is filtered through the capacitor C3, and then is inputted to the triode Q3; it is equivalent to a 2-input XNOR gate, when the signal inputted along the resistor R16 is consistent with the signal inputted along the resistor R17, the triode is not conductive, and the output voltage signal is outputted; when the interference signal inputted along the resistor R16 is inconsistent with the signal inputted along the resistor R17, the triode is conductive, and no signal is outputted.

[0035] The input module includes independent safety loop and trigger loop, when the two safety loops and trigger loops detect signals, the handheld laser welding machine can allow laser output; the safety loop is extremely seriously interfered by external electromagnetic, static electricity and surge, and needs to be comprehensively isolated or protected, while the trigger loop is normally isolated or protected.

[0036] The input module includes high-voltage isolation power supply U1, high-voltage isolation power supply U2 and high-voltage isolation power supply U4 connected with each other, high-voltage isolation power supply U1 is connected with self-recovery fuse F2, high-voltage isolation power supply U4 is connected with self-recovery fuse F3, high-voltage isolation power supply U2 is connected with voltage stabilizing diode D1, high-voltage isolation power supply U4 is connected with the emitter of triode Q1, the collector of triode Q1 is connected with self-recovery fuse F4, electrostatic and surge protector D5 through voltage stabilizing diode U10 and diode D10 respectively, electrostatic and surge protector D5 is connected with self-recovery fuse F3, high-voltage isolation power supply U4 and capacitor U14, capacitor U14 is connected with the emitter of triode Q1, high-voltage isolation power supply U2 is connected with capacitor U9, high-voltage isolation power supply U1 is connected with electrostatic and surge protector D11 through voltage stabilizing diode U7 and diode D9, electrostatic and surge protector D11 is connected with capacitor U15, capacitor U15 is connected with electrostatic and surge protector D11 and voltage stabilizing diode U7, the collector of triode Q1 is connected with photoelectric coupler U5 through resistor R4, resistor R4 is connected with light emitting diode LED3 through resistor R1, high-voltage isolation power supply U1 is connected with resistor R5, resistor R5 is connected with photoelectric coupler U6, resistor R5 is connected with light emitting diode LED2 through resistor R2, self-recovery fuse F4, F2 and F3 are connected with connector CN2, connector CN2 is also connected with self-recovery fuse F1.Electrostatic and surge protector D5 and D11 prevent high-voltage and large-current surge, self-recovery fuse F1, F2, F3 and F4 limit current to prevent any form of large current from entering, high-voltage isolation power supply U1, U2 and U4 and photoelectric coupler U5 and U6 have certain isolation effect to prevent high voltage from entering the next stage circuit, capacitor U9, U14 and U15 have filtering effect to stabilize power supply voltage, light emitting diode LED2 and LED3 have loop indication effect, voltage stabilizing diode D1, diode D9 and diode D10 prevent current reversal and have certain protection effect, voltage stabilizing diode D1, U7 and U10 protect photoelectric coupler.

[0037] The safety loop operation process: the high-voltage isolation power supply U2 supplies power to the high-voltage isolation power supply U4 after being filtered by the capacitor U9, when the handheld laser welder works, the safety clamp of the handheld laser welder clamps the welding workpiece of metal, the welding gun of the handheld laser welder contacts the metal workpiece, and the circuit connection effect is formed, specifically, the 1st port and the 2nd port of the connector CN2 are short-circuited, the 5V power supply generated by the high-voltage isolation power supply U4 forms a current loop along the triode Q1, the resistor R4, the optical coupler U5, the diode D10, the self-resetting fuse F4, the welding gun, the workpiece, the safety clamp, the self-resetting fuse F3; when the triode Q1 is driven by the standard PWM signal A, the same signal will also be generated at the optical coupler U5, and the PWM signal will change accordingly due to the interference of external electromagnetic, static electricity and surge, forming the PWM signal B; when the same or gate module detects that the PWM signals A and B are consistent, it represents that the welding safety of the handheld laser welder is controllable, otherwise it is not controllable.

[0038] The trigger loop operation process: the high-voltage isolation power supply U2 supplies power to the high-voltage isolation power supply U1 after being filtered by the capacitor U9, when the handheld laser welder works, the trigger of the handheld laser welder is closed, and the circuit connection effect is formed, specifically, the 3rd port and the 4th port of the connector CN are short-circuited, the 5V power supply generated by the high-voltage isolation power supply U1 forms a current loop along the resistor R5, the optical coupler U6, the diode D9, the self-resetting fuse F1, the welding gun trigger switch and the self-resetting fuse F2; a closed loop signal will also be generated at the optical coupler U6, and LED2 is lit along the resistor R2 at the same time, representing that the handheld laser welder starts to output laser; otherwise, the handheld laser welder does not start to output laser.

[0039] The output module includes four jumpers J3, J4, J5 and J6, the jumper J3 is connected with the jumper J4, the jumper J3 and the jumper J4 are connected with the optical coupler U17, the jumper J4 is connected with the jumper J6, the jumper J5 is connected with the jumper J6, and the jumper J3, the jumper J4, the jumper J5 and the jumper J6 are connected with the connector CN4. The optical coupler U17 has a high-voltage isolation function, and the four jumpers J3, J4, J5 and J6 jointly determine the output mode, for example, common power negative output or common power positive output; the controller of the handheld laser welder is connected into the connector CN4 to receive the safety loop signal and the trigger loop signal.

[0040] For the trigger loop of the handheld laser welder welding gun, the signal generated by the trigger loop in the input module is directly transmitted to the output module along the third optical coupling isolation module C.

[0041] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic environment high voltage isolator for a handheld laser welding machine gun head, characterized by, The power module, the signal generator, the EXCLUSIVE-OR gate module, the input module and the output module are included, the power module is connected with the signal generator and the input module, the output end of the signal generator is connected with the input end through the first optical coupling isolation module, the output end of the signal generator is connected with the input end of the EXCLUSIVE-OR gate module, the input end of the input module is connected with the welding gun of the handheld laser welding machine, the output end of the input module is connected with the second optical coupling isolation module and the third optical coupling isolation module, the second optical coupling isolation module is connected with the input end of the EXCLUSIVE-OR gate module, the third optical coupling isolation module is connected with the input end of the output module, the output end of the EXCLUSIVE-OR gate module is connected with the input end of the output module, and the output end of the output module is connected with the controller of the handheld welding machine.

2. The electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head of claim 1, wherein, The power module includes a high-voltage isolation DC-DC power supply A and a high-voltage isolation DC-DC power supply B; the high-voltage isolation DC-DC power supply B is connected with the high-voltage isolation DC-DC power supply A and the signal generator, and the high-voltage isolation DC-DC power supply B is converted into a direct current 5V power supply after being connected with a 24V external power supply, so as to supply power for the high-voltage isolation DC-DC power supply A and the signal generator; and the high-voltage isolation DC-DC power supply A is connected with the input module to supply power for the input module.

3. The electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head of claim 1, wherein, The signal generator includes a chip U11, an optical coupling U12 and an optical coupling U16, the chip U11 is connected with an adjusting resistor RP1, one end of the adjusting resistor RP1 is connected with a resistor R3, and the other end of the adjusting resistor RP1 is connected with a resistor R6, the chip U11 is connected with a capacitor C1 and a capacitor C2, the output pin of the chip U11 is connected with a resistor R7 and a resistor R23 which are arranged in parallel, the resistor R7 is connected with the optical coupling U12, the resistor R23 is connected with the optical coupling U16, the optical coupling U12 is connected with the first optical coupling isolation module, and the optical coupling U16 is connected with the EXCLUSIVE-OR gate module.

4. The electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head of claim 1, wherein, The EXCLUSIVE-OR gate module includes one 4-channel 2-input NAND logic chip U19 and a transistor Q3, the input end of the NAND logic chip U19 is connected with a resistor R16 and a resistor R17, the output end of the NAND logic chip U19 is connected with a resistor R15 and a resistor R21, the resistor R21 is connected with the base of the transistor Q3 through a resistor R14, the collector of the transistor Q3 is connected with the resistor R15, the emitter of the transistor Q3 is connected with a resistor R20, the resistor R20 is connected with the resistor R14 and the resistor R21, and the capacitor C3 is connected between the base and the emitter of the transistor Q3 and grounded.

5. An electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head as defined in claim 1, wherein, The input module includes a safety loop and a trigger loop which are independent of each other, and when the safety loop and the trigger loop both detect signals, laser is emitted outward.

6. The electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head of claim 5, wherein, The input module includes high-voltage isolation power supply U1, high-voltage isolation power supply U2 and high-voltage isolation power supply U4 connected with each other, the high-voltage isolation power supply U1 is connected with self-recovery fuse F2, the high-voltage isolation power supply U4 is connected with self-recovery fuse F3, the high-voltage isolation power supply U2 is connected with voltage stabilizing diode D1, the high-voltage isolation power supply U4 is connected with the emitter of triode Q1, the collector of triode Q1 is connected with self-recovery fuse F4, electrostatic and surge protector D5 through voltage stabilizing diode U10 and diode D10 respectively, the electrostatic and surge protector D5 is connected with self-recovery fuse F3, high-voltage isolation power supply U4 and capacitor U14, the capacitor U14 is connected with the emitter of triode Q1, the high-voltage isolation power supply U2 is connected with capacitor U9, the high-voltage isolation power supply U1 is connected with electrostatic and surge protector D11 through voltage stabilizing diode U7 and diode D9, the electrostatic and surge protector D11 is connected with capacitor U15, the capacitor U15 is connected with electrostatic and surge protector D11 and voltage stabilizing diode U7, the collector of triode Q1 is connected with photoelectric coupler U5 through resistor R4, the resistor R4 is connected with light emitting diode LED3 through resistor R1, the high-voltage isolation power supply U1 is connected with resistor R5, the resistor R5 is connected with photoelectric coupler U6, the resistor R5 is connected with light emitting diode LED2 through resistor R2, self-recovery fuses F4, F2 and F3 are connected with connector CN2, and the connector CN2 is also connected with self-recovery fuse F1.

7. The electromagnetic environmental high voltage isolator for a handheld laser welding machine gun head of claim 6, wherein, The output module includes four jumpers J3, J4, J5 and J6, the jumper J3 is connected with the jumper J4, the jumper J3 and the jumper J4 are connected with photoelectric coupler U17, the jumper J4 is connected with the jumper J6, the jumper J5 is connected with the jumper J6, and the jumpers J3, J4, J5 and J6 are connected with connector CN4.

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