Laser interlocking circuit resistant to high-frequency and high-voltage interference

Abstract

The invention provides a laser interlocking circuit resistant to high-frequency and high-voltage interference, which comprises a laser welding gun head, a laser welding interlocking clamp, an optocoupler circuit, a high-voltage isolation circuit and a bleeder circuit, the laser welding gun head is a positive electrode, the laser welding interlocking clamp is a negative electrode, and the optocoupler circuit is connected with the high-voltage isolation circuit. A trigger current between the laser welding gun head and the laser welding interlocking clamp enters the optocoupler circuit; the high-voltage isolation circuit adopts a high-voltage resistor, a high-voltage capacitor and a high-voltage isolation power supply; the bleeder circuit is connected with the laser welding gun head and the laser welding chain clamp, and high-frequency high-voltage current is led into a ground wire through a gas discharge tube. Through a simple and reliable isolation circuit mode, the safety interlocking function of the handheld laser welding machine is realized, the safety of laser equipment is improved, the anti-interference capability is strong, the interference problem of working on the same platform as argon arc welding is solved, and the application scene limitation of the handheld laser welding machine is relieved.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to a laser interlocking circuit that resists high-frequency high-voltage interference. Background Technology

[0002] Long-distance laser transmission can cause harm to people. To avoid safety issues, laser welding machines are equipped with a safety interlock detection function. Specifically, a safety clamp is installed on the welding table, and the laser welding head has a detection circuit. When the torch head contacts the welding table, the interlock circuit with the safety clamp is activated, and the laser can be output when the clamp is unlocked. When the torch head leaves the table and is suspended in the air, the locking circuit is activated, and the laser output stops, thus providing safety protection.

[0003] When argon arc welding begins, it generates strong interference with the surrounding environment. Specifically, the arc-starting voltage range for argon arc welding is typically between 2500-3000V. This voltage is the voltage between the tungsten electrode of the argon arc welding torch and the workpiece. The arc is generated by the high voltage breaking down the air. During the argon arc welding process, the frequency of the high-frequency vibrator is 200-500kHz, generating an electric field strength of 140-190V / m. Because the laser welding torch and the argon arc welding torch are on the same platform, the aforementioned strong interference can directly enter the machine through the laser welding torch or clamp. Due to the excessive voltage, ordinary insulation and isolation measures are basically ineffective. High voltage can easily cause circuit malfunction or damage. After damage, the interlocking protection fails, creating safety hazards. Summary of the Invention

[0004] In view of this, the present application provides a laser interlocking circuit that resists high-frequency and high-voltage interference to solve the technical defects existing in the prior art.

[0005] According to a first aspect of the embodiments of this application, a laser interlocking circuit resistant to high-frequency high-voltage interference is provided, including a laser welding torch head, a laser welding interlocking clamp, an optocoupler circuit, a high-voltage isolation circuit, and a discharge circuit, wherein... The laser welding gun head is the positive electrode, the laser welding interlocking clamp is the negative electrode, and the trigger current between the laser welding gun head and the laser welding interlocking clamp enters the optocoupler circuit. The high-voltage isolation circuit employs a high-voltage resistor, a high-voltage capacitor, and a high-voltage isolation power supply. The discharge circuit connects the laser welding torch head to the laser welding interlock clamp, and conducts high-frequency high-voltage current to the ground wire through the gas discharge tube.

[0006] Optionally, the laser welding interlock clamp is fixed to the welding worktable. When the laser welding head is connected to the welding worktable, the trigger current is generated. The trigger current enters the optocoupler circuit, and the rear terminal of the optocoupler circuit is turned on, and the interlock signal changes from high level to low level.

[0007] Optionally, the high-voltage isolation power supply adopts magnetic isolation, and the isolation voltage is greater than 6000 volts.

[0008] Optionally, the voltage across the gas discharge tube is higher than a preset threshold, and the discharge current is greater than 5000 amperes.

[0009] Optionally, it also includes a resistor-capacitor interface circuit, wherein, The resistor-capacitor interface circuit is connected to the gas discharge tube. The resistor in the resistor-capacitor interface circuit blocks the DC signal, and the capacitor in the resistor-capacitor interface circuit introduces the high-frequency high-voltage current into the gas discharge tube.

[0010] Optionally, it also includes a detection circuit, wherein, The detection circuit includes an argon arc welding torch head, an argon arc welding clamp, an automatic controller PLC, and an arc initiation device.

[0011] Optionally, the operation of the detection circuit includes: The laser welding interlock clamp is fixed to the welding worktable, and the laser welding head is connected to the welding worktable. The argon arc welding clamp is fixed to the welding workbench, and the argon arc welding gun head is fixed, wherein the argon arc welding gun head and the surface of the welding workbench are kept at a preset distance; The automatic controller PLC controls the arc ignition device, and the arc ignition device controls the arc ignition of the argon arc welding torch head; The test results of the laser interlocking circuit resistant to high-frequency high-voltage interference are determined by the output signal of the PLC of the automation controller.

[0012] Optionally, determining the test result of the laser interlocking circuit resistant to high-frequency high-voltage interference through the output signal of the automation controller PLC includes: The number of arc ignitions of the argon arc welding torch is recorded according to the automated controller PLC. If the number of arc initiation counts does not meet the preset arc initiation count requirements, and the laser interlocking circuit for resisting high-frequency high-voltage interference malfunctions, the test is stopped, and the test result is output as "failed". When the number of arc initiation times meets the preset arc initiation time requirement, and the laser interlocking circuit for resisting high-frequency high-voltage interference does not malfunction, the test is stopped, and the test result is output as passed.

[0013] This application provides a laser interlocking circuit for resisting high-frequency, high-voltage interference, including a laser welding torch head, a laser welding interlocking clamp, an optocoupler circuit, a high-voltage isolation circuit, and a discharge circuit. The laser welding torch head is the positive terminal, and the laser welding interlocking clamp is the negative terminal. The trigger current between the laser welding torch head and the laser welding interlocking clamp enters the optocoupler circuit. The high-voltage isolation circuit employs a high-voltage resistor, a high-voltage capacitor, and a high-voltage isolation power supply. The discharge circuit connects the laser welding torch head and the laser welding interlocking clamp, and conducts the high-frequency, high-voltage current to ground through a gas discharge tube. Through a simple and reliable isolation circuit, a safety interlocking function for a handheld laser welding machine is achieved, improving the safety of the laser equipment, providing strong anti-interference capabilities, overcoming the interference problem when working on the same platform as argon arc welding, and removing the application scenario limitations of the handheld laser welding machine. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a circuit diagram of a laser interlocking circuit for resisting high-frequency and high-voltage interference provided in one embodiment of this application; Figure 2 This is a schematic diagram of a laser interlocking circuit for resisting high-frequency and high-voltage interference provided in one embodiment of this application. Detailed Implementation

[0016] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0017] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0018] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first.

[0019] This application provides a laser interlocking circuit that resists high-frequency, high-voltage interference. Detailed description is provided in the following embodiments.

[0020] Figure 1 This is a circuit diagram of a laser interlocking circuit for resisting high-frequency and high-voltage interference provided in one embodiment of this application. Figure 1 The diagram illustrates a circuit schematic of a laser interlocking circuit for resisting high-frequency high-voltage interference according to an embodiment of this application. The laser interlocking circuit includes a laser welding torch head, a laser welding interlocking clamp, an optocoupler circuit, a high-voltage isolation circuit, and a discharge circuit. The laser welding gun head is the positive electrode, the laser welding interlocking clamp is the negative electrode, and the trigger current between the laser welding gun head and the laser welding interlocking clamp enters the optocoupler circuit. The high-voltage isolation circuit employs a high-voltage resistor, a high-voltage capacitor, and a high-voltage isolation power supply. The discharge circuit connects the laser welding torch head to the laser welding interlock clamp, and conducts high-frequency high-voltage current to the ground wire through the gas discharge tube.

[0021] like Figure 1 As shown, the laser welding interlock clamp is the negative electrode, clamped on the welding worktable. When the positive laser welding torch tip contacts the welding worktable, conduction occurs between the two electrodes, generating current that flows to the input terminal of the optocoupler circuit. Conversely, when the laser welding torch tip is not in contact with the welding worktable, the connection between the two electrodes is broken. The optocoupler acts as an isolation device, preventing interference from affecting subsequent circuits. The discharge circuit uses a gas discharge tube. When laser welding and TIG welding are simultaneously operating on the welding worktable, the high-frequency, high-voltage current generated by TIG welding is conducted to ground through the gas discharge tube, preventing any impact on the laser welding.

[0022] Furthermore, the laser welding interlock clamp is fixed on the welding worktable. When the laser welding head is connected to the welding worktable, the trigger current is generated. The trigger current enters the optocoupler circuit, and the rear terminal of the optocoupler circuit is turned on, causing the interlock signal to change from a high level to a low level.

[0023] The optocoupler circuit outputs a high or low level signal based on the connection status between the laser welding head and the welding worktable. Specifically, when the laser welding head is connected to the welding worktable, the interlocking signal output by the optocoupler circuit is low; conversely, when the laser welding head is not connected to the welding worktable, the interlocking signal output by the optocoupler circuit is high. The connection status of the laser welding head can be detected based on the high or low level of the interlocking signal.

[0024] Furthermore, the high-voltage isolated power supply adopts magnetic isolation, and the isolation voltage is greater than 6000 volts.

[0025] Furthermore, the voltage across the gas discharge tube is higher than a preset threshold, and the discharge current is greater than 5000 amperes.

[0026] Furthermore, it also includes a resistor-capacitor interface circuit, wherein the resistor-capacitor interface circuit is connected to the gas discharge tube, the resistor in the resistor-capacitor interface circuit blocks DC signals, and the capacitor in the resistor-capacitor interface circuit introduces the high-frequency high-voltage current into the gas discharge tube.

[0027] To prevent damage to the circuit from high-frequency high voltage, a discharge circuit conducts the high-frequency high voltage away. Specifically, the signal input at the laser welding torch tip is connected to ground via a gas discharge tube, and the signal input at the interlocking clamp of the laser welding interlock is also connected to ground via a gas discharge tube. Figure 1 As shown, GDT is the gas discharge tube. When the voltage across the gas discharge tube exceeds a certain threshold, i.e., a preset threshold, the instantaneous discharge current can reach over 5000A. When high-frequency high voltage is input, the gas discharge tube is connected to ground, diverting the high-frequency high voltage to the ground without affecting subsequent circuits. To prevent DC signals from misleading the gas discharge tube, a resistor-capacitor interface circuit is used to connect the input to the gas discharge tube. The DC signal is blocked by the resistor and does not interfere with the gas discharge tube, while the high-frequency high voltage signal is conducted to the gas discharge tube through the capacitor diameter.

[0028] Furthermore, it also includes a detection circuit, which includes an argon arc welding torch head, an argon arc welding clamp, an automatic controller PLC, and an arc initiation device.

[0029] Furthermore, the operation of the detection circuit includes: The laser welding interlock is fixed to the welding worktable, and the laser welding head is connected to the welding worktable; the argon arc welding clamp is fixed to the welding worktable, and the argon arc welding torch head is fixed, wherein the argon arc welding torch head maintains a preset distance from the surface of the welding worktable; the arc ignition device is controlled by the automation controller PLC, and the arc ignition device is used to control the arc ignition of the argon arc welding torch head; the test result of the laser interlock circuit against high-frequency high-voltage interference is determined by the output signal of the automation controller PLC.

[0030] Furthermore, the process of determining the test result of the laser interlocking circuit against high-frequency high-voltage interference through the output signal of the automation controller PLC is specifically implemented as follows in this embodiment: The PLC (Power Controller for Automation) records the number of arc ignitions of the argon arc welding torch. If the number of arc ignitions does not meet the preset requirement and the interlocking circuit of the laser anti-high frequency high voltage interference malfunctions, the test is stopped and the test result is output as "failed". If the number of arc ignitions meets the preset requirement and the interlocking circuit of the laser anti-high frequency high voltage interference does not malfunction, the test is stopped and the test result is output as "passed".

[0031] Among them, such as Figure 2 The provided schematic diagram illustrates a laser interlocking circuit designed to resist high-frequency, high-voltage interference. On the welding worktable, the laser welding torch head and the laser welding interlocking clamp are both connected on a single metal surface. The argon arc welding clamp is also fixed to the welding worktable, with the argon arc welding torch head mounted on the same surface. The torch electrode is 2-4 mm away from the surface; the higher the distance, the higher the voltage. When the argon arc welding torch head is suspended, it does not form a circuit with the argon arc welding clamp during arc initiation, thus only entering the arc initiation process and not the welding process, generating high-frequency, high-voltage interference. An automated PLC controller is used to initiate the arc with the argon arc welding torch head and record the number of arc initiations. After a fixed number of arc initiations, if the equipment does not malfunction, the test is passed.

[0032] Based on this, an interlocking detection circuit for a handheld laser welding machine was realized. By using a high-isolation power supply and optically isolated signals, it was achieved to resist high-frequency and high-voltage interference from argon arc welding when working on the same platform as argon arc welding. Furthermore, the detection circuit standardized the inspection of the laser welding device's resistance to argon arc welding interference, thereby standardizing the development and acceptance standards of new laser welding devices.

[0033] Furthermore, the laser interlocking circuit resistant to high-frequency, high-voltage interference also includes a computing device for controlling and monitoring the operation of the detection circuit, thereby enabling testing of the laser interlocking circuit resistant to high-frequency, high-voltage interference. Components of this computing device include, but are not limited to, a memory and a processor. The processor and memory are connected via a bus, and a database is used to store data.

[0034] The computing device also includes access devices that enable the computing device to communicate via one or more networks. Examples of such networks include a Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the Internet. Access devices may include one or more of any type of wired or wireless network interface (e.g., a Network Interface Card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) interface, a Wi-MAX interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and so on.

[0035] In one embodiment of this application, other components of the computing device (not shown above) may also be interconnected, for example, via a bus. The computing device can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or PCs. The computing device can also be a mobile or stationary server.

[0036] The processor executes computer-executable instructions for each step of testing the laser interlocking circuit against high-frequency, high-voltage interference. One embodiment of this application also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement steps for testing the laser interlocking circuit against high-frequency, high-voltage interference. Another embodiment of this application provides a chip storing a computer program that, when executed by the chip, implements the steps of testing the laser interlocking circuit against high-frequency, high-voltage interference.

[0037] The foregoing has described specific embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0038] The computer instructions include computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable medium may include any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

[0039] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0040] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0041] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A laser interlocking circuit resistant to high-frequency high-voltage interference, characterized in that, This includes a laser welding torch head, laser welding interlocking clamp, optocoupler circuit, high-voltage isolation circuit, and discharge circuit. The laser welding gun head is the positive electrode, the laser welding interlocking clamp is the negative electrode, and the trigger current between the laser welding gun head and the laser welding interlocking clamp enters the optocoupler circuit. The high-voltage isolation circuit employs a high-voltage resistor, a high-voltage capacitor, and a high-voltage isolation power supply. The discharge circuit connects the laser welding torch head to the laser welding interlock clamp, and conducts high-frequency high-voltage current to the ground wire through the gas discharge tube.

2. The laser interlocking circuit against high-frequency high-voltage interference according to claim 1, characterized in that, The laser welding interlock clamp is fixed on the welding worktable. When the laser welding head is connected to the welding worktable, the trigger current is generated. The trigger current enters the optocoupler circuit, and the rear terminal of the optocoupler circuit is turned on, and the interlock signal changes from high level to low level.

3. The laser interlocking circuit against high-frequency high-voltage interference according to claim 1, characterized in that, The high-voltage isolated power supply uses magnetic isolation, and the isolation voltage is greater than 6000 volts.

4. The laser interlocking circuit against high-frequency high-voltage interference according to claim 1, characterized in that, The voltage across the gas discharge tube is higher than a preset threshold, and the discharge current is greater than 5000 amperes.

5. The laser interlocking circuit against high-frequency high-voltage interference according to claim 1, characterized in that, It also includes a resistor-capacitor interface circuit, in which, The resistor-capacitor interface circuit is connected to the gas discharge tube. The resistor in the resistor-capacitor interface circuit blocks the DC signal, and the capacitor in the resistor-capacitor interface circuit introduces the high-frequency high-voltage current into the gas discharge tube.

6. The laser interlocking circuit against high-frequency high-voltage interference according to claim 2, characterized in that, It also includes a detection circuit, in which, The detection circuit includes an argon arc welding torch head, an argon arc welding clamp, an automatic controller PLC, and an arc initiation device.

7. The laser interlocking circuit against high-frequency high-voltage interference according to claim 6, characterized in that, The operation of the detection circuit includes: The laser welding interlock clamp is fixed to the welding worktable, and the laser welding head is connected to the welding worktable. The argon arc welding clamp is fixed to the welding workbench, and the argon arc welding gun head is fixed, wherein the argon arc welding gun head and the surface of the welding workbench are kept at a preset distance; The automatic controller PLC controls the arc ignition device, and the arc ignition device controls the arc ignition of the argon arc welding torch head; The test results of the laser interlocking circuit resistant to high-frequency high-voltage interference are determined by the output signal of the PLC of the automation controller.

8. The laser interlocking circuit against high-frequency high-voltage interference according to claim 7, characterized in that, The process of determining the test results of the laser interlocking circuit resistant to high-frequency high-voltage interference through the output signal of the PLC (Power Controller) includes: The number of arc ignitions of the argon arc welding torch is recorded according to the automated controller PLC. If the number of arc initiation counts does not meet the preset arc initiation count requirements, and the laser interlocking circuit for resisting high-frequency high-voltage interference malfunctions, the test is stopped, and the test result is output as "failed". When the number of arc initiation times meets the preset arc initiation time requirement, and the laser interlocking circuit for resisting high-frequency high-voltage interference does not malfunction, the test is stopped, and the test result is output as passed.

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