A handheld laser welding device

Abstract

This utility model discloses a handheld laser welding device, which includes a metal gun body with an alumina ceramic nozzle and a high-frequency oscillation circuit, a rectifier filter circuit, an electronic switch circuit, and an MCU disposed within the gun body and connected in sequence. The high-frequency oscillation circuit is electrically connected to the metal gun body so that when the alumina ceramic nozzle approaches the metal workpiece, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit, the rectifier filter circuit, and the electronic switch circuit. The MCU is used to turn the gun body on or off according to the switch signal. In this application, since the internal circuit has no electrical connection with the metal workpiece being welded, it has strong anti-interference ability, and the nozzle does not need to contact the workpiece, resulting in a longer service life.

Description

Technical Field

[0001] This utility model relates to a handheld laser welding device. Background Technology

[0002] The safety clamp on a handheld laser welding machine is a crucial passive safety device. Its core working principle is to forcibly stop laser output by physically disconnecting the safety circuit, ensuring operator safety and preventing serious accidents such as burns, fires, or equipment damage caused by accidental laser emission. When welding metal workpieces with a handheld laser welding machine, the safety clamp must hold the workpiece in place, and then the welding head's copper nozzle contacts the workpiece, forming a closed circuit. Laser output is only permitted when the MCU detects a valid safety clamp signal.

[0003] Existing safety clamps hold metal workpieces, with their internal signal ground connected to the external metal workpiece. In high-voltage working environments, poor grounding can cause the safety clamp to become energized, and this high voltage can couple into the handheld laser, causing instability in the handheld laser welding machine system, incorrect laser output, and even burnout of the internal circuitry of the handheld laser welding machine, resulting in safety accidents.

[0004] Alternatively, if the user operates improperly, such as clamping the safety clip directly onto the barrel to disable the safety clip's protective function during laser welding, this behavior will cause the equipment to lose its safety protection and may lead to a serious accident.

[0005] Furthermore, slight deformation, dirt, oxidation, and protective film on the metal workpiece can lead to poor contact between the nozzle and the metal workpiece, frequently triggering the protection function and affecting the brightening welding. Utility Model Content

[0006] The main objective of this invention is to provide a handheld laser welding device to solve the aforementioned technical problems.

[0007] To achieve the above objectives, this utility model proposes a handheld laser welding device comprising a metal gun body with an alumina ceramic nozzle and a high-frequency oscillation circuit, a rectifier filter circuit, an electronic switch circuit, and an MCU disposed within the gun body and connected in sequence. The high-frequency oscillation circuit is electrically connected to the metal gun body so that when the alumina ceramic nozzle approaches the metal workpiece, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit, the rectifier filter circuit, and the electronic switch circuit. The MCU is used to turn the gun body on or off according to the switch signal.

[0008] In one embodiment, the electronic switch circuit includes an optocoupler, a MOSFET, a first transistor, a first resistor, a second resistor, and a first capacitor. The first pin of the optocoupler is connected to the negative terminal of the power supply through the first resistor. The second pin of the optocoupler is connected to the drain of the MOSFET. The third pin of the optocoupler is grounded. The fourth pin of the optocoupler is connected to the positive terminal of the power supply through the second resistor. The first capacitor, the second resistor, and the third pin of the optocoupler are connected together. The source of the MOSFET is connected to the emitter of the first transistor.

[0009] In one embodiment, the electronic switching circuit further includes a fifth resistor connected between the collector of the first transistor and the gate of the MOS transistor.

[0010] In one embodiment, the electronic switch circuit further includes a third resistor, the two ends of which are connected to the third resistor and the first resistor, respectively.

[0011] In one embodiment, the rectifier filter circuit includes a first diode, a second diode, a fourth resistor, and a second adjustable resistor. The anode of the second diode is grounded, the cathode of the second diode is connected to the anode of the first diode, the cathode of the first diode is connected to the first terminal of the second adjustable resistor, the first terminal of the second adjustable resistor is connected to the base of the second transistor, the second terminal of the second adjustable resistor is connected to the anode of the second diode, and the anode of the first diode is connected to the high-frequency oscillation circuit through the fourth resistor.

[0012] In one embodiment, the rectifier filter circuit further includes a third capacitor, the two ends of which are respectively connected between the cathode of the first diode and the anode of the second diode.

[0013] In one embodiment, the high-frequency oscillation circuit includes a high-frequency transformer, a first adjustable resistor, a seventh resistor, an eighth resistor, and a second transistor. The first pin of the high-frequency transformer is connected to the base of the second transistor, the fifth pin of the high-frequency transformer is connected to the collector of the second transistor, the emitter of the second transistor is grounded through the eighth resistor, the sixth pin of the high-frequency transformer is connected to the negative terminal of the power supply, the third pin of the high-frequency transformer is connected to the fourth resistor, the fourth pin of the high-frequency transformer is grounded, the second pin of the high-frequency transformer is connected to the first end of the first adjustable resistor, the second end of the first adjustable resistor is connected to the negative terminal of the power supply, and the second pin of the high-frequency transformer is grounded through the seventh resistor.

[0014] In one embodiment, the high-frequency oscillation circuit further includes a fourth capacitor, which is connected in parallel across the seventh resistor.

[0015] In one embodiment, the high-frequency oscillation circuit further includes a fifth capacitor, and the fourth capacitor is connected in parallel across the eighth resistor.

[0016] In this invention, the handheld laser welding device includes a metal gun body with an alumina ceramic nozzle and a high-frequency oscillation circuit, a rectifier-filter circuit, an electronic switch circuit, and an MCU, which are sequentially connected within the gun body. The high-frequency oscillation circuit is electrically connected to the metal gun body so that when the alumina ceramic nozzle approaches the metal workpiece, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit, the rectifier-filter circuit, and the electronic switch circuit. The MCU is used to turn the gun body on or off according to the switch signal. In this application, based on the principle of electromagnetic induction, a high-frequency alternating magnetic field can be generated inside the circuit of the metal gun body. When the alumina ceramic nozzle approaches the metal workpiece, an eddy current effect is generated inside the metal workpiece, causing the magnetic field energy to attenuate, and the oscillation to weaken or stop. This changing signal is converted into a switch signal by the subsequent rectifier-filter circuit and sent to the MCU detection pin to determine whether laser output conditions are met. In this application, since the internal circuit has no electrical connection with the welded metal workpiece, it has strong anti-interference capabilities, and the nozzle does not need to contact the workpiece, resulting in a longer service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the handheld laser welding device according to an embodiment of the present invention;

[0019] Figure 2 This is a circuit diagram of an embodiment of the present utility model.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] This invention provides a handheld laser welding device.

[0026] like Figure 1-2 As shown, the handheld laser welding device provided in this embodiment of the present invention includes a metal gun body 10 with an alumina ceramic nozzle 20 and a high-frequency oscillation circuit 60, a rectifier filter circuit 50, an electronic switch circuit 40, and an MCU disposed within the gun body 10 and connected in sequence. The high-frequency oscillation circuit 60 and the alumina ceramic nozzle 20 are electrically connected so that when the metal gun body 10 approaches the metal workpiece 30, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit 60, the rectifier filter circuit 50, and the electronic switch circuit 40. The MCU is used to turn the gun body 10 on or off according to the switch signal.

[0027] In this application, based on the principle of electromagnetic induction, a high-frequency alternating magnetic field can be generated inside the circuit of the metal gun body. When the nozzle 20 approaches the metal workpiece 30, an eddy current effect is generated inside the metal workpiece, causing the magnetic field energy to attenuate, and the oscillation to weaken or stop. This changing signal is converted into a switching signal by the subsequent rectifier and filter circuit 50 and sent to the MCU detection pin to determine whether the laser output conditions are met. In this application, since the internal circuit has no electrical connection with the welded metal workpiece 30, the anti-interference ability is strong, and the nozzle 20 does not need to contact the workpiece, resulting in a longer service life.

[0028] Specifically, the electronic switch circuit 40 includes an optocoupler, a MOSFET, a first transistor, a first resistor, a second resistor, and a first capacitor. The first pin of the optocoupler is connected to the negative terminal of the power supply through the first resistor. The second pin of the optocoupler is connected to the drain of the MOSFET. The third pin of the optocoupler is grounded. The fourth pin of the optocoupler is connected to the positive terminal of the power supply through the second resistor. The fourth pin of the optocoupler is connected to the input terminal of the MCU. The first capacitor, the second resistor, and the third pin of the optocoupler are connected together. The source of the MOSFET is connected to the emitter of the first transistor.

[0029] The electronic switching circuit 40 further includes a fifth resistor connected between the collector of the first transistor and the gate of the MOS transistor. The electronic switching circuit 40 also includes a third resistor, with its two ends connected to both the first resistor and the third resistor.

[0030] The rectifier filter circuit 50 includes a first diode, a second diode, a fourth resistor, and a second adjustable resistor. The anode of the second diode is grounded, the cathode of the second diode is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the second adjustable resistor, the first end of the second adjustable resistor is connected to the base of the second transistor, the second end of the second adjustable resistor is connected to the anode of the second diode, and the anode of the first diode is connected to the high-frequency oscillation circuit 60 through the fourth resistor.

[0031] The rectifier filter circuit 50 also includes a third capacitor, the two ends of which are respectively connected between the cathode of the first diode and the anode of the second diode.

[0032] The high-frequency oscillation circuit 60 includes a high-frequency transformer, a first adjustable resistor, a seventh resistor, an eighth resistor, and a second transistor. The first pin of the high-frequency transformer is connected to the base of the second transistor, the fifth pin of the high-frequency transformer is connected to the collector of the second transistor, the emitter of the second transistor is grounded through the eighth resistor, the sixth pin of the high-frequency transformer is connected to the negative terminal of the power supply, the third pin of the high-frequency transformer is connected to the fourth resistor, the fourth pin of the high-frequency transformer is grounded, the second pin of the high-frequency transformer is connected to the first end of the first adjustable resistor, the second end of the first adjustable resistor is connected to the negative terminal of the power supply, and the second pin of the high-frequency transformer is grounded through the seventh resistor.

[0033] The high-frequency oscillation circuit 60 further includes a fourth capacitor, which is connected in parallel across the seventh resistor. The high-frequency oscillation circuit 60 also includes a fifth capacitor, which is connected in parallel across the eighth resistor.

[0034] Based on the above embodiment, the high-frequency transformer U2 acts as a detection sensor for the welding torch nozzle 20 to detect the metal workpiece 30. When the metal workpiece 30 is not close to the detection sensor of the welding torch nozzle 20, the 5V power supply current flows through the adjustable resistor RW1, and into the second transistor Q3 via pins 1 and 2 of the high-frequency transformer U2. The second transistor Q3 then enters the amplification and conduction state. The current at pins 5 and 6 of the high-frequency transformer U2 gradually increases, generating an induced electromotive force at pins 5 and 6 that is positive at the top and negative at the bottom. Due to the mutual inductance principle of transformers, a voltage is induced at pins 1 and 2 of the high-frequency transformer U2 that is positive at the bottom and negative at the top. This voltage, combined with the 5V power supply voltage, causes the second transistor Q3 to quickly enter saturation.

[0035] When the second transistor Q3 is saturated, the decrease in current change at pins 5 and 6 of the high-frequency transformer U2 induces a voltage that is positive at the bottom and negative at the top. Due to the mutual inductance principle of the transformer, pins 1 and 2 of the high-frequency transformer U2 induce a voltage that is positive at the top and negative at the bottom. The second transistor Q3 enters the amplification state from the saturation state. The superimposed 5V power supply voltage causes the second transistor Q3 to quickly enter the cutoff state.

[0036] After the second transistor Q3 is turned off, it will turn on again, repeating the above process, and the high-frequency oscillation circuit 60 will continue to oscillate. The generated alternating voltage is output through pins 3 and 4 of U2, rectified by the first diode D1 and the third capacitor C3, and then sent to the base of the first transistor Q2. The first transistor Q2 is saturated and turned on, the gate voltage of the MOSFET Q1 is pulled low, causing the MOSFET Q1 to turn off, and the LED inside the optocoupler U1 does not light up. The second diode D2 protects the first transistor Q2 from high voltage damage. When the phototransistor is not turned on, the MCU detects a high level and does not allow laser output.

[0037] When a metal workpiece 30 approaches the detection probe, eddy current loss will be generated, causing the high-frequency oscillation circuit 60 to stop oscillating. Pins 3 and 4 of the high-frequency transformer U2 will not be able to output alternating voltage. The first transistor Q2 will be cut off due to the disappearance of the DC voltage at its base. The MOS transistor Q1 will be turned on, and the light-emitting diode inside the optocoupler U1 will light up. When the phototransistor is turned on, the MCU detects a low level and allows laser output.

[0038] In the above embodiments, the detection distance and detection sensitivity of the detection sensor can be changed by adjusting the resistance values ​​of adjustable resistors RW1 and RW2.

[0039] The handheld laser welding device provided in this application has stronger anti-interference capabilities and higher safety than the traditional safety clamp implementation method. It also has lower requirements for the surface of the welded metal workpiece 30 and can extend the service life of the nozzle 20 consumables.

[0040] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A handheld laser welding device, characterized in that, The handheld laser welding device includes a metal gun body with an alumina ceramic nozzle and a high-frequency oscillation circuit, a rectifier filter circuit, an electronic switch circuit, and an MCU arranged in sequence within the gun body. The high-frequency oscillation circuit and the metal gun body are electrically connected so that when the alumina ceramic nozzle approaches the metal workpiece, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit, the rectifier filter circuit, and the electronic switch circuit. The MCU is used to turn the gun body on or off according to the switch signal.

2. The handheld laser welding device according to claim 1, characterized in that, The electronic switching circuit includes an optocoupler, a MOSFET, a first transistor, a first resistor, a second resistor, and a first capacitor. The first pin of the optocoupler is connected to the negative terminal of the power supply through the first resistor. The second pin of the optocoupler is connected to the drain of the MOSFET. The third pin of the optocoupler is grounded. The fourth pin of the optocoupler is connected to the positive terminal of the power supply through the second resistor. The fourth pin of the optocoupler is connected to the input terminal of the MCU. The first capacitor, the second resistor, and the third pin of the optocoupler are connected together. The source of the MOSFET is connected to the emitter of the first transistor.

3. The handheld laser welding device according to claim 2, characterized in that, The electronic switching circuit also includes a fifth resistor, which is connected between the collector of the first transistor and the gate of the MOS transistor.

4. The handheld laser welding device according to claim 3, characterized in that, The electronic switch circuit also includes a third resistor, the two ends of which are connected to the third resistor and the first resistor, respectively.

5. The handheld laser welding device according to claim 4, characterized in that, The rectifier filter circuit includes a first diode, a second diode, a fourth resistor, and a second adjustable resistor. The anode of the second diode is grounded, the cathode of the second diode is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the second adjustable resistor, the first end of the second adjustable resistor is connected to the base of the first transistor, the second end of the second adjustable resistor is connected to the anode of the second diode, and the anode of the first diode is connected to the high-frequency oscillation circuit through the fourth resistor.

6. The handheld laser welding device according to claim 5, characterized in that, The rectifier filter circuit also includes a third capacitor, the two ends of which are respectively connected between the cathode of the first diode and the anode of the second diode.

7. The handheld laser welding device according to claim 6, characterized in that, The high-frequency oscillation circuit includes a high-frequency transformer, a first adjustable resistor, a seventh resistor, an eighth resistor, and a second transistor. The first pin of the high-frequency transformer is connected to the base of the second transistor, the fifth pin of the high-frequency transformer is connected to the collector of the second transistor, the emitter of the second transistor is grounded through the eighth resistor, the sixth pin of the high-frequency transformer is connected to the negative terminal of the power supply, the third pin of the high-frequency transformer is connected to the fourth resistor, the fourth pin of the high-frequency transformer is grounded, the second pin of the high-frequency transformer is connected to the first end of the first adjustable resistor, the second end of the first adjustable resistor is connected to the negative terminal of the power supply, and the second pin of the high-frequency transformer is grounded through the seventh resistor.

8. The handheld laser welding device according to claim 7, characterized in that, The high-frequency oscillation circuit also includes a fourth capacitor, which is connected in parallel across the seventh resistor.

9. The handheld laser welding device according to claim 8, characterized in that, The high-frequency oscillation circuit also includes a fifth capacitor, and the fourth capacitor is connected in parallel across the eighth resistor.

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