Automatic protection device for handheld laser welding safety switch

Abstract

The utility model relates to an automatic protection device for a handheld laser welding safety switch. The automatic protection device is composed of a photoelectric isolation device, a power protection device, a filtering device, a welding gun graduated tube, a ground clamp and a switch. The two ends of the switch are connected with one end of the welding gun graduated tube and one end of the ground clamp respectively, one end of the filter device is connected with the other end of the welding gun graduated tube and the other end of the ground clamp at the same time, and one end of the power protection device is connected with the other end of the filter device. And the other end of the power protection device is connected with the input end of the control system, so that the device can prevent light from being emitted by mistake after the gun is lifted, avoid misoperation and ensure the operation safety, obvious light emitting prompts are arranged on the device, an operator can clearly know when light is emitted, accidents are reduced, and the device is safe, reliable and high in stability, and is suitable for popularization and application. Meanwhile, automatic protection can be achieved, and the good protection effect on people and equipment can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a protection device belongs to handheld laser welding device technical field, concretely relates to a handheld laser welding safety switch automatic protection device. BACKGROUND

[0002] With the rapid development of laser technology, laser process application also becomes more and more rich: laser welding, laser cleaning, laser cutting, laser cladding, laser marking... The manufacturers of corresponding laser equipment are also more and more, however, the rapid development also leads to the quality of part of laser products to be uneven, and the operation safety of operating personnel has a certain degree of risk. Handheld laser welding machine because of its fast welding speed, no thermal deformation, lower requirement to welder experience and other advantages, in recent years, it has replaced traditional welding methods such as argon arc welding in domestic market, and becomes the mainstream welding method.

[0003] Laser involves personal safety, and safety protection is very important. Handheld laser welding usually consists of a ground clamp and a welding gun scale tube switch as a safety switch. When the ground clamp, workpiece and welding gun scale tube are in conduction, the laser welding control panel detects the signal effective, and the equipment is allowed to emit laser. Because the platform and workpiece may have other high-power equipment working at the same time, the signal on the platform is complex, and even there is a situation of electric leakage and induced current, therefore, the safety switch protection circuit needs to cope with the complex circuit environment, so as not to fail, to prevent the situation of accidental light emission. UTILITY MODEL CONTENT

[0004] The utility model discloses a handheld laser welding safety switch automatic protection device, solves the above-mentioned problem.

[0005] Technical scheme: a handheld laser welding safety switch automatic protection device, the automatic protection device is composed of photoelectric isolation device, power protection device, filter device, welding gun scale tube, ground clamp and switch;

[0006] In further embodiments, two ends of the switch are connected with one end of the welding gun scale tube and one end of the ground clamp respectively, one end of the filter device is connected with the other end of the welding gun scale tube and the other end of the ground clamp simultaneously, one end of the power protection device is connected with the other end of the filter device, and the other end of the power protection device is connected with the input end of the control system.

[0007] In further embodiments, the output end of the control system is connected with the laser, and the control system inputs the light emission signal.

[0008] In further embodiments, the filter device filters out common mode signals, the power protection device protects the circuit from burning out, the photoelectric isolation device isolates the signal and prevents interference to the control system.

[0009] In a further embodiment, the filter device is composed of a common mode inductor L1 to suppress common mode signals and prevent common mode interference;

[0010] The 2nd pin of the common mode inductor L1 is connected to the other end of the ground clamp, and the 3rd pin of the common mode inductor L1 is connected to the other end of the welding torch scale tube.

[0011] In a further embodiment, the power protection device is composed of a self-resetting fuse F1, a self-resetting fuse F2, a composite tube U1, a resistor R4, a resistor R5, a diode D1, and a TVS tube D2;

[0012] The self-resetting fuse F1 and the self-resetting fuse F2 are used for overcurrent protection, the composite tube U1 is used for overvoltage and overcurrent protection to prevent the back end of the device from burning out, and the TVS tube D2 is used for surge and static protection;

[0013] One end of the self-resetting fuse F1 is connected to the 4th pin of the common mode inductor L1, one end of the self-resetting fuse F2 is connected to the 1st pin of the common mode inductor L1, the 1st pin of the composite tube U1 is connected to the other end of the self-resetting fuse F1, the 3rd pin of the composite tube U1 is connected to the other end of the self-resetting fuse F1 and the 1st pin of the TVS tube D2 and signal ground, the 2nd pin of the diode D1 is connected to the 2nd pin of the composite tube U1, the 2nd pin of the TVS tube D2 is connected to one end of the resistor R4, one end of the resistor R5, and the 1st pin of the diode D1, and the other end of the resistor R5 inputs a signal V_ISO.

[0014] In a further embodiment, the optoelectronic isolation device is composed of an optocoupler U2, a triode Q1, a resistor R3, a resistor R1, a resistor R2, and an indicator lamp LED1, the optocoupler U2 performs optoelectronic isolation to prevent signal interference to the back-end circuit;

[0015] The pin 1 of the optical coupler U2 is connected with the other end of the resistor R4, the pin 2 of the optical coupler U2 is connected with the pin 3 of the compound tube U1, the other end of the self-resetting fuse F1 and the pin 1 of the TVS tube D2 and signal ground, the pin 3 of the optical coupler U2 is grounded, the pin 4 of the optical coupler U2 is connected with the pin 1 of the triode Q1 and one end of the resistor R3, the other end of the resistor R3 inputs 3.3V voltage, the pin 2 of the triode Q1 is grounded, the pin 3 of the triode Q1 is connected with one end of the resistor R2, one end of the resistor R1 and outputs a signal to the control system, the pin 2 of the indicator lamp LED1 is connected with the other end of the resistor R2, the pin 1 of the indicator lamp LED1 inputs 3.3V voltage, and the other end of the resistor R1 inputs 3.3V voltage.

[0016] In a further embodiment, the control system is constituted by an MCU processor.

[0017] Beneficial effects: when the equivalent switch K between the welding gun scale tube and the ground clamp is closed, the safety switch automatic protection device circuit inputs a low-level signal to the system MCU. If the system MCU detects both the light output signal of the handheld welding gun and the low-level signal, the laser can output light; if the system MCU detects only one of the low-level signal and the light output signal, the laser does not output light, so that the utility model can prevent misoperation after lifting the gun, avoid misoperation, ensure operation safety, the equipment is equipped with obvious light output prompt, the operator can clearly know when to output light, reduce accidents, so that the utility model is safe, reliable and high in stability, and can automatically protect and protect people and equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a schematic diagram of the safety switch automatic protection device of the utility model.

[0019] Fig. 2 It is a circuit diagram of the safety switch automatic protection device of the utility model. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0021] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] A handheld laser welding safety switch automatic protection device, comprising: photoelectric isolation device, power protection device, filter device, welding gun scale tube, ground clamp and switch;

[0024] In one embodiment, as shown in Figs. 1-2 The two ends of the switch are connected with one end of the welding gun scale tube and one end of the ground clamp respectively, one end of the filter device is connected with the other end of the welding gun scale tube and the other end of the ground clamp simultaneously, one end of the power protection device is connected with the other end of the filter device, and the other end of the power protection device is connected with the input end of the control system.

[0025] Specifically, when the ground clamp, the workpiece and the welding gun scale tube are conducted, the laser welding control panel detects the signal effective and allows the equipment to emit laser.

[0026] In one embodiment, as shown in Figs. 1-2 The output end of the control system is connected with the laser, and the control system inputs the light signal.

[0027] In one embodiment, as shown in Figs. 1-2 The filter device filters out common mode signals, the power protection device protects the circuit from burning out, and the photoelectric isolation device isolates the signal and prevents interference to the control system.

[0028] In one embodiment, as shown in Figs. 1-2As shown, the filter device is composed of a common mode inductor L1 to suppress common mode signals and prevent common mode interference;

[0029] The No. 2 pin of the common mode inductor L1 is connected to the other end of the ground clamp, and the No. 3 pin of the common mode inductor L1 is connected to the other end of the welding gun scale tube.

[0030] In one embodiment, as shown in Figs. 1-2 As shown, the power protection device is composed of a self-resetting fuse F1, a self-resetting fuse F2, a composite tube U1, a resistor R4, a resistor R5, a diode D1, and a TVS tube D2;

[0031] The self-resetting fuse F1 and the self-resetting fuse F2 are used for overcurrent protection, the composite tube U1 is used for overvoltage and overcurrent protection to prevent the back end of the device from burning out, and the TVS tube D2 is used for surge and static protection;

[0032] One end of the self-resetting fuse F1 is connected to the No. 4 pin of the common mode inductor L1, one end of the self-resetting fuse F2 is connected to the No. 1 pin of the common mode inductor L1, the No. 1 pin of the composite tube U1 is connected to the other end of the self-resetting fuse F1, the No. 3 pin of the composite tube U1 is connected to the other end of the self-resetting fuse F1 and the No. 1 pin of the TVS tube D2 and signal ground, the No. 2 pin of the diode D1 is connected to the No. 2 pin of the composite tube U1, the No. 2 pin of the TVS tube D2 is connected to one end of the resistor R4, one end of the resistor R5, and the No. 1 pin of the diode D1, and the other end of the resistor R5 inputs a signal V_ISO.

[0033] In one embodiment, as shown in Figs. 1-2 As shown, the optoelectronic isolation device is composed of an optocoupler U2, a triode Q1, a resistor R3, a resistor R1, a resistor R2, and an indicator lamp LED1. The optocoupler U2 performs optoelectronic isolation to prevent signal interference to the back-end circuit.

[0034] The pin 1 of the optical coupler U2 is connected with the other end of the resistor R4, the pin 2 of the optical coupler U2 is connected with the pin 3 of the compound tube U1, the other end of the self-resetting fuse F1 and the pin 1 of the TVS tube D2 and signal ground, the pin 3 of the optical coupler U2 is grounded, the pin 4 of the optical coupler U2 is connected with the pin 1 of the triode Q1 and one end of the resistor R3, the other end of the resistor R3 inputs 3.3V voltage, the pin 2 of the triode Q1 is grounded, the pin 3 of the triode Q1 is connected with one end of the resistor R2 and one end of the resistor R1 and outputs a signal to the control system, the pin 2 of the indicator lamp LED1 is connected with the other end of the resistor R2, the pin 1 of the indicator lamp LED1 inputs 3.3V voltage, and the other end of the resistor R1 inputs 3.3V voltage.

[0035] In one embodiment, as shown in Figs. 1-2 The control system is composed of an MCU processor.

[0036] The practicability of the utility model is explained by experiments as follows:

[0037] Test method: the board is safely locked at both ends (welding gun scale tube and ground clamp) and power is repeatedly supplied for 5 times, and each time the power-on time is 60S. After the power-on is completed, the board is cooled, and the next power supply is performed. The experimental data is shown in Table 1, wherein the power P = u 2 / R.

[0038]

[0039]

[0040] Working principle: when the equivalent switch K between the welding gun scale tube and the ground clamp is closed, the safety switch automatic protection device circuit inputs a low-level signal to the system MCU. If the system MCU simultaneously detects the light output signal of the handheld welding gun and the low-level signal, the laser can emit light, as shown in Fig. 2 If the system MCU only detects one of the low-level signal and the light output signal, the laser does not emit light.

[0041] Obviously, the above embodiments are only examples for clearly illustrating, and not limit the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A hand-held laser welding safety switch automatic protection device, characterized in that, The automatic protection device is composed of photoelectric isolation device, power protection device, filter device, welding gun scale tube, ground clamp and switch. One end of the switch is connected with one end of the welding gun scale tube and one end of the ground clamp, the other end of the filter device is connected with the other end of the welding gun scale tube and the other end of the ground clamp, one end of the power protection device is connected with the other end of the filter device, and the other end of the power protection device is connected with the input end of the control system.

2. A hand-held laser welding safety switch automatic protection device according to claim 1, characterized in that, The output end of the control system is connected with the laser, and the control system outputs light signal.

3. The automatic protection device for safety switch of handheld laser welding according to claim 1, characterized in that, The filter device filters common mode signal, the power protection device protects circuit from burning out, and the photoelectric isolation device isolates signal to prevent interference to the control system.

4. The automatic safety protection device for a handheld laser welding safety switch according to claim 1, characterized in that, The filter device is composed of common mode inductor L1 to suppress common mode signal and prevent common mode interference. The No. 2 pin of the common mode inductor L1 is connected with the other end of the ground clamp, and the No. 3 pin of the common mode inductor L1 is connected with the other end of the welding gun scale tube.

5. The automatic safety protection device for a handheld laser welding safety switch according to claim 4, characterized in that, The power protection device is composed of self-resetting fuse F1, self-resetting fuse F2, composite tube U1, resistance R4, resistance R5, diode D1 and TVS tube D2. The self-resetting fuse F1 and the self-resetting fuse F2 are used for overcurrent protection, the composite tube U1 is used for overvoltage and overcurrent protection to prevent burning out of the rear end of the device, and the TVS tube D2 is used for surge and static electricity protection. One end of the self-resetting fuse F1 is connected with the No. 4 pin of the common mode inductor L1, one end of the self-resetting fuse F2 is connected with the No. 1 pin of the common mode inductor L1, the No. 1 pin of the composite tube U1 is connected with the other end of the self-resetting fuse F1, the No. 3 pin of the composite tube U1 is connected with the other end of the self-resetting fuse F1 and the No. 1 pin of the TVS tube D2 and signal ground, the No. 2 pin of the diode D1 is connected with the No. 2 pin of the composite tube U1, the No. 2 pin of the TVS tube D2 is connected with one end of the resistance R4, one end of the resistance R5 and the No. 1 pin of the diode D1, and the other end of the resistance R5 inputs signal V_ISO.

6. A hand-held laser welding safety switch automatic protection device according to claim 5, characterized in that, The photoelectric isolation device is composed of optical coupler U2, triode Q1, resistance R3, resistance R1, resistance R2 and indicator lamp LED1, the optical coupler U2 performs photoelectric isolation to prevent signal interference to the rear end circuit. The No.1 pin of the photocoupler U2 is connected with the other end of the resistor R4, the No.2 pin of the photocoupler U2 is connected with the No.3 pin of the compound tube U1, the other end of the self-recovery fuse F1 and the No.1 pin of the TVS tube D2 at the same time and signal ground, the No.3 pin of the photocoupler U2 is grounded, the No.4 pin of the photocoupler U2 is connected with the No.1 pin of the triode Q1 and one end of the resistor R3 at the same time, the other end of the resistor R3 inputs 3.3V voltage, the No.2 pin of the triode Q1 is grounded, the No.3 pin of the triode Q1 is connected with one end of the resistor R2 and one end of the resistor R1 at the same time and outputs signal to the control system, the No.2 pin of the indicator lamp LED1 is connected with the other end of the resistor R2, the No.1 pin of the indicator lamp LED1 inputs 3.3V voltage, the other end of the resistor R1 inputs 3.3V voltage.

7. The automatic safety protection device for a handheld laser welding safety switch according to claim 1, characterized in that, The control system is composed of MCU processor.

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