A wiring harness connection mistake prevention device

Abstract

The utility model discloses a kind of harness connection mistake-proofing devices, including base, welding station and welding assembly are equipped on base, the side top of welding station is equipped with first harness positioning slot and second harness positioning slot side by side;Welding assembly includes welding torch and soldering wire, welding torch is controlled to press down by first lower pressing tool, soldering wire is controlled to extend by extension assembly;Color sensor is also provided above welding station, for detecting the color of harness in first harness positioning slot, color sensor is connected in series with foot switch;When color sensor detects that positive harness color is correct and operator presses foot switch, welding assembly executes welding action.The device can identify the polarity of harness in real time and accurately when welding LED light source product harness, avoid harness polarity to return, improve production quality and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wire harness welding technology, and specifically to a wire harness connection error prevention device. Background Technology

[0002] LED light source products require wire harnesses to conduct electricity, and these wire harnesses are distinguished by color and polarity. However, during the soldering process, due to operator negligence or other reasons, the wire harness polarity may be soldered incorrectly. If subsequent inspection fails to detect the soldering error in the LED light source product's wire harness, the product will be defective and unable to light up normally. Utility Model Content

[0003] The purpose of this invention is to provide a wire harness connection error prevention device. This device can identify the wire harness polarity in real time and accurately when welding LED light source product wire harnesses, avoid wire harness polarity reversal, and improve production quality and efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A wire harness connection error prevention device includes a base on which a soldering station and a soldering assembly are provided;

[0006] The welding station is used to place LED light source products to be welded, and a wire harness positioning groove is provided on the welding station;

[0007] The welding assembly is used to weld the positive and negative electrode wire harnesses onto the LED light source product;

[0008] A color sensor is also provided above the welding station. The probe of the color sensor is facing the wire harness positioning groove and is used to detect the color of the wire harness in the wire harness positioning groove. The color sensor is connected in series with a foot switch. When the color sensor detects that the color of the wire harness in the wire harness positioning groove is correct and the operator steps on the foot switch, the welding assembly performs the welding action.

[0009] Preferably, the welding assembly includes a welding torch and solder wire;

[0010] The welding torch is positioned above the welding station, with the welding end of the welding torch facing the end of the LED light source product to be welded. The welding torch is controlled to be pressed down and lifted by a first pressing fixture. The first pressing fixture includes a vertical slide rail connected to the base, and a slider is provided on the slide rail. The slider is controlled by a first cylinder to slide along the slide rail, and the slider is connected to the welding torch.

[0011] The solder wire extension assembly includes a housing. Inside the housing are a motor, a drive wheel, and a driven wheel. The drive wheel is driven to rotate by the motor. The drive wheel and the driven wheel are connected by gear meshing. The drive wheel has a solder wire placement groove. The driven wheel has a circumferential protrusion. When the drive wheel and the driven wheel are gear meshed, the protrusion is directly opposite the solder wire placement groove, and the solder wire is pressed into the solder wire placement groove by the protrusion. The solder wire moves by the friction between the solder wire, the solder wire placement groove, and the protrusion. A pipe is provided on the side of the housing near the soldering gun. One end of the pipe is connected to the inside of the housing, and the other end is located above the soldering station and corresponds to the position of the wire harness positioning groove. The solder wire extends to the position to be soldered through the pipe.

[0012] Preferably, the slider is connected to the piston rod of the first cylinder, and the first cylinder drives the slider to slide up and down along the slide rail; the welding torch is connected to the slider through a welding torch bracket to achieve synchronous movement of the welding torch and the slider.

[0013] Preferably, the drive wheel is sleeved and fixedly connected to the output shaft of the motor. The drive wheel includes a first bushing, on which the solder wire placement groove and the drive gear are circumferentially provided. The driven wheel includes a second bushing, on which the protrusion and the driven gear are circumferentially provided. When the drive gear and the driven gear mesh, the protrusion is directly opposite the position of the solder wire placement groove, and presses the solder wire into the solder wire placement groove, so that the solder wire can be moved during the rotation of the drive gear and the driven gear.

[0014] Preferably, the base is further provided with a second pressing fixture, which includes a second cylinder. The piston rod of the second cylinder is connected to the end of the pipeline near the welding gun through a connecting bracket, and is used to control the pressing down of the solder wire so that the solder wire can contact the LED light source product when the welding gun is welding.

[0015] Preferably, it also includes a solder wire support frame, one end of which is fixedly connected to the base, and the other end is provided with a crossbeam. A sleeve is fitted on the crossbeam, and the solder wire is wound around the outside of the sleeve. The sleeve can rotate along the crossbeam.

[0016] Preferably, the wire harness positioning slot includes a first wire harness positioning slot and a second wire harness positioning slot, which are arranged side by side on the top of one side of the soldering station. The first wire harness positioning slot is used to place the positive wire harness, and the second wire harness positioning slot is used to place the negative wire harness. The probe of the color sensor is facing the first wire harness positioning slot and / or the second wire harness positioning slot, and is used to detect the color of the wire harness in the first wire harness positioning slot and / or the second wire harness positioning slot.

[0017] Preferably, the device further includes a first intermediate relay, a second intermediate relay, and a buzzer. The output terminal of the color sensor is connected to the first intermediate relay, the first output terminal of the first intermediate relay is connected to the welding assembly, the second output terminal of the first intermediate relay is connected to the second intermediate relay, and the normally open terminal of the second intermediate relay is connected to the buzzer.

[0018] Preferably, the system also includes a PLC controller. The positive wire harness is placed in the first wire harness positioning slot, and the negative wire harness is placed in the second wire harness positioning slot. Simultaneously, a foot switch is pressed, and the PLC controller performs the following operations according to a preset program: First, the color sensor transmits the detected wire harness color information to the first intermediate relay. When the wire harness color is correct, the first output terminal of the first intermediate relay is turned on. At this time, the PLC controller controls the motor to start, causing the solder wire to extend. Simultaneously, the second cylinder controls the pipe near the welding gun to press down. Next, the PLC controller controls the piston rod of the first cylinder to extend, driving the slider to slide downwards, which in turn causes the welding gun to slide downwards. Under the high temperature of the welding gun, the solder wire melts, welding the positive and negative wire harnesses onto the LED light source product. Finally, the PLC controller controls the first and second cylinders to return to their original states, completing one welding operation. When the wire harness color is incorrect, the second output terminal of the first intermediate relay is turned on, the normally open terminal of the second intermediate relay becomes the normally closed terminal, and the buzzer sounds an alarm.

[0019] Preferably, it also includes a smoke exhaust duct, one end of which is fixed to one side of the welding torch for removing fumes generated during the welding process.

[0020] In the above technical solution, a color sensor is connected in series with a foot switch to jointly control the wire harness welding process. The welding torch will only perform the welding action when the color sensor detects the correct color of the positive and / or negative wire harness, and the operator presses the foot switch. This avoids situations where the operator rushes into the process and the welding is triggered before the positive and / or negative wire harness is fully positioned correctly. A second intermediate relay and a buzzer are also included. When the foot switch is pressed, if the detected color information is incorrect and the foot switch is not damaged, the buzzer will sound an alarm, prompting the operator to reconnect the wire harness.

[0021] The first pressing fixture allows the welding torch to be pressed down and raised, achieving the welding action. Combined with the extending component, this ensures a continuous and stable supply of solder wire during welding, with the solder wire positioned inside the conduit, preventing movement. One end of the conduit connects to a second pressing fixture, which controls the rise and fall of that end. This allows the solder wire to rise and fall synchronously with the conduit, extending to the end of the LED light source product to be welded and making direct contact. This prevents the welding torch from affecting the solder wire's position during pressing down, maintaining its stability and improving welding quality. Furthermore, when the conduit rises, it does not obstruct the placement of the LED light source product on the welding station, making this wiring harness connection error-proofing device more practical. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle;

[0024] Figure 3 This is a three-dimensional structural diagram of the present invention from another angle;

[0025] Figure 4 This is a schematic diagram of the connection structure between the driving wheel and the driven wheel of this utility model.

[0026] Figure 5 This is a schematic diagram of the welding station of this utility model;

[0027] Figure 6 This is the circuit diagram of this utility model.

[0028] In the diagram, 10 is the base; 11 is the soldering station; 12 is the first wire harness positioning groove; 13 is the second wire harness positioning groove; 14 is the soldering gun; 15 is the solder wire; 16 is the slide rail; 17 is the slider; 18 is the first cylinder; 19 is the soldering gun bracket; 20 is the housing; 21 is the pipeline; 22 is the drive wheel; 23 is the first bushing; 24 is the solder wire placement groove; 25 is the snap-fit ​​block; 26 is the drive gear; 27 is the driven wheel; 28 is the second bushing; 29 is the protrusion; 30 is the driven gear; 31 is the fixed shaft; 32 is the solder wire support frame; 33 is the sleeve; 34 is the second cylinder; 35 is the connecting frame; 37 is the support assembly; 38 is the foot switch; 39 is the exhaust duct; 40 is the PLC controller; S1 is the color sensor; KA1 is the first intermediate relay; KA2 is the second intermediate relay; and BUZ is the buzzer. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] like Figures 1 to 6As shown, a wire harness connection error-proofing device includes a base 10, a soldering station 11, and a soldering assembly. The base 10 is placed on an external workbench to provide stable support for the entire device. The soldering station 11, with a flat surface, is fixedly mounted on the base 10 for placing the LED light source product to be soldered. A first wire harness positioning groove 12 and a second wire harness positioning groove 13 are arranged side-by-side on the top side of one side of the soldering station 11. The first wire harness positioning groove 12 is used to place the positive wire harness, and the second wire harness positioning groove 13 is used to place the negative wire harness. The first wire harness positioning groove 12 and the second wire harness positioning groove 13 help operators quickly and accurately place the wire harness in the correct position.

[0031] The welding assembly includes a welding torch 14 and solder wire 15. The welding torch 14 is positioned above the welding station 11, with its welding end facing the end of the LED light source product to be welded. The welding end of the torch 14 is elongated, allowing it to simultaneously cover both the positive and negative ends of the LED light source product during welding. The welding torch 14 is controlled by a first pressing fixture to press down and lift. The first pressing fixture includes a sliding assembly connected to the base 10. The sliding assembly includes a vertical slide rail 16 fixedly connected to the base 10, and a slider 17 mounted on the slide rail 16. The slider 17 engages with the slide rail 16 in the left-right and front-back directions, and can slide vertically. A first cylinder 18 is fixedly connected to the top of the slide rail 16, and the piston rod of the first cylinder 18 is fixedly connected to the top of the slider 17. The welding torch 14 is connected to the slider 17 via the welding torch bracket 19, and the slider 17 is driven to slide up and down along the slide rail 16 by the first cylinder 18, thereby driving the welding torch 14 to move up and down synchronously, thus completing the control of pressing down and lifting the welding torch 14.

[0032] Solder wire 15 connects to the extension assembly, which includes a housing 20. Inside the housing 20 are a motor, a drive wheel 22, and a driven wheel 27. The motor is fixedly connected inside the housing 20 and provides power to the extension assembly. The drive wheel 22 includes a first bushing 23, on which a solder wire placement groove 24 and a drive gear 26 are circumferentially arranged. The first bushing 23 is fitted onto the output shaft of the motor and fixedly connected to the output shaft, enabling the motor to drive the drive wheel to rotate synchronously. The driven wheel 27 includes a second bushing 28, on which a protrusion 29 and a driven gear 30 are circumferentially arranged. A fixed shaft 31 is provided along the axial direction of the first bushing 23, with both ends of the fixed shaft 31 fixedly connected to the housing 20. The second bushing 28 is fitted around the fixed shaft 31 and rotatably connected to the fixed shaft 31. The drive wheel 22 drives the driven wheel 27 to rotate synchronously through the meshing of the drive gear 26 and the driven gear 30. Simultaneously, the solder wire 15 is pressed into the solder wire placement groove 24 by the protrusion 29, and the solder wire 15 moves synchronously by the friction between the solder wire 15, the solder wire placement groove 24, and the protrusion 29. A pipe 21 is provided on the side of the outer casing 20 near the soldering gun 14. One end of the pipe 21 is connected to the inside of the outer casing 20, and the solder wire 15 extends to the outside of the outer casing 20 through the pipe 21. The other end of the pipe 21 is positioned above the soldering station 11 and corresponds to the positions of the first wire harness positioning groove 12 and the second wire harness positioning groove 13, providing solder wire 15 to the soldering gun 14 so that the solder wire 15 can simultaneously cover the positive and negative wire harness ends to be soldered. When the motor drives the drive wheel 22 to rotate, the drive gear 26 meshes with the driven gear 30, and the solder wire 15 is pushed out by the friction between the solder wire placement groove 24, the protrusion 29, and the solder wire 15, ensuring a stable supply of solder wire 15. In this embodiment, a solder wire support frame 32 is fixedly installed on the base 10. One end of the solder wire support frame 32 is fixedly connected to the base 10, and the other end is provided with a crossbeam. A sleeve 33 is fitted on the crossbeam, and the sleeve 33 can rotate along the crossbeam to wind the solder wire 15 around the sleeve 33, facilitating rotational wire feeding. In this embodiment, clamping blocks 25 are evenly arranged circumferentially on both sides of the solder wire placement groove 24 to clamp the solder wire 15 and increase friction.

[0033] A second pressing fixture is also provided on the base 10. The second pressing fixture includes a second cylinder 34. The piston rod of the second cylinder 34 is connected to the end of the pipeline 21 near the welding gun 14 through the connecting bracket 35. It is used to control the pressing down of the solder wire 15 so that the solder wire 15 can contact the end of the LED light source product to be welded when the welding gun 14 is welding, thereby improving the welding quality.

[0034] A color sensor S1 is provided above the soldering station 11. The color sensor S1 is connected to the base 10 through a support component 37. The support component 37 adopts a universal magnetic base (the universal magnetic base is existing technology and will not be described in detail here), which can realize flexible adjustment of the position of the color sensor S1 so that the probe of the color sensor S1 can be directly aligned with the first wire harness positioning groove 12 and / or the second wire harness positioning groove 13.

[0035] Color sensor S1 is connected in series with foot switch 3, and the two work together to control the wire harness welding process. Welding gun 14 will only perform the welding action when color sensor S1 detects the correct color of the positive wire harness and the operator simultaneously presses foot switch 38. This prevents situations where the operator rushes into the process and welding is triggered before the positive and / or negative wire harnesses are fully positioned correctly. Through the dual control of color sensor S1 and foot switch 38, welding will only proceed when the positive wire harness color is correct and the positive and negative wire harnesses are accurately positioned, thereby improving welding quality.

[0036] The output terminal of color sensor S1 is connected to the first intermediate relay KA1. The first output terminal of the first intermediate relay KA1 is connected to the welding assembly. The second output terminal of the first intermediate relay KA1 is connected to the second intermediate relay KA2. The normally open terminal of the second intermediate relay KA2 is connected to the buzzer BUZ. The working principle of color sensor S1 is to determine the color of the wire harness by detecting the color of the light reflected from the wire harness and comparing it with preset color information. When foot switch 38 is pressed and color sensor S1 detects that the color of the wire harness in the first wire harness positioning slot 12 and / or the second wire harness positioning slot 13 matches the preset color, the first output terminal of the first intermediate relay KA1 is turned on, and the welding assembly is started; the second output terminal of the first intermediate relay KA1 has no current output. At this time, the second intermediate relay KA2 remains in the normally open state, the alarm circuit is not turned on, and the buzzer BUZ does not sound. When the foot switch 38 is pressed and the color sensor S1 detects that the color of the wire harness in the first wire harness positioning slot 12 and / or the second wire harness positioning slot 13 is inconsistent with the preset color, the first output terminal of the first intermediate relay KA1 is cut off, cutting off the starting circuit of the welding assembly, and the welding assembly cannot be started. At the same time, the second output terminal of the first intermediate relay KA1 has current output, the normally open terminal of the second intermediate relay KA2 becomes the normally closed terminal, and the buzzer BUZ sounds an alarm.

[0037] In a preferred embodiment, a fume extraction duct 39 is fixedly installed on one side of the welding torch 14, with one end of the fume extraction duct 39 close to the welding torch 14, for removing the fumes generated during the welding process of the welding torch 14 and improving the working environment.

[0038] In addition, this error-proofing device also includes a PLC controller 40. The PLC controller 40 is programmed to set the control program for the welding process. When the positive wire harness is placed in the first wire harness positioning slot 12 and the negative wire harness in the second wire harness positioning slot 13, and the foot switch 38 is pressed, the PLC controller 40 performs the following operations according to the preset program: First, the color sensor S1 transmits the detected wire harness color information to the first intermediate relay KA1. When the wire harness color is correct, the first output terminal of the first intermediate relay KA1 is turned on. At this time, the PLC controller 40 controls the motor to start, causing the solder wire 15 to extend from the pipe 21. Simultaneously, it controls the piston rod of the second cylinder 34 to shorten, pressing down the pipe 21 near the welding torch 14. Then, it controls the piston rod of the first cylinder 18 to extend, causing the slider 17 to slide downwards, which in turn causes the welding torch 14 to slide downwards. Under the high temperature of the welding torch 14, the solder wire 15 melts, simultaneously welding the positive and negative wire harnesses onto the circuit board. Finally, the PLC controller 40 controls the first cylinder 18 and the second cylinder 34 to return to their original states, thus completing one welding operation. When the wire harness color is incorrect, the second output terminal of the first intermediate relay KA1 is turned on, the normally open terminal of the second intermediate relay KA2 becomes the normally closed terminal, and the buzzer BUZ sounds an alarm.

[0039] In use, the following example illustrates the process of using color sensor S1 with its probe facing the first wire harness positioning slot 12. First, the color sensor S1 probe illuminates and records the color information of the wire harness in the first wire harness positioning slot 12, which is then used as the preset color information for the positive wire harness. Next, the operator places the LED light source product to be soldered on the soldering station 11, simultaneously placing the positive wire harness in the first wire harness positioning slot 12 and the negative wire harness in the second wire harness positioning slot 13. At this point, the operator presses the foot switch 38, and color sensor S1 begins to detect the color information of the positive wire harness in the first wire harness positioning slot 12 and compares it with the preset color information of color sensor S1. The comparison result is transmitted to the first intermediate relay KA1. If color sensor S1 detects a mismatch between the positive wire harness color and the preset color, no current flows through the first output terminal of the first intermediate relay KA1, and the soldering assembly will not start. Simultaneously, the second output terminal is turned on, the normally open terminal of the second intermediate relay KA2 becomes a normally closed terminal, and the buzzer BUZ sounds, alerting the operator that the positive wire harness color is incorrect. When the positive wire harness color is correct, the first output terminal of the first intermediate relay KA1 is turned on. The PLC controller 40 receives the electrical signal and starts the welding process according to the preset program. At the same time, no current flows through the second output terminal of the first intermediate relay KA1, and the buzzer BUZ does not sound an alarm. During the welding process, the welding torch 14 welds the positive and negative wire harnesses simultaneously through the solder wire 15. During the welding process, the solder wire 15 melts due to heat. The molten solder preferentially gathers at the welding positions of the positive and negative wire harnesses due to surface tension, preventing the positive and negative wire harnesses from being directly connected.

[0040] This embodiment is merely an illustration of the concept and implementation of this utility model, and is not intended to limit it. Under the concept of this utility model, the technical solution without substantial changes is still within the protection scope.

Claims

1. A wire harness connection error prevention device, comprising a base, characterized in that, A welding station and welding components are provided on the base; The welding station is used to place LED light source products to be welded, and a wire harness positioning groove is provided on the welding station; The welding assembly is used to weld the positive and negative electrode wire harnesses onto the LED light source product; A color sensor is also provided above the welding station. The probe of the color sensor is facing the wire harness positioning groove and is used to detect the color of the wire harness in the wire harness positioning groove. The color sensor is connected in series with a foot switch. When the color sensor detects that the color of the wire harness in the wire harness positioning groove is correct and the operator steps on the foot switch, the welding assembly performs the welding action.

2. The wire harness connection error prevention device according to claim 1, characterized in that, The welding assembly includes a welding torch and solder wire; The welding torch is positioned above the welding station, with the welding end of the welding torch facing the end of the LED light source product to be welded. The welding torch is controlled to be pressed down and lifted by a first pressing fixture. The first pressing fixture includes a vertical slide rail connected to the base, and a slider is provided on the slide rail. The slider is controlled by a first cylinder to slide along the slide rail, and the slider is connected to the welding torch. The solder wire extension assembly includes a housing. Inside the housing are a motor, a drive wheel, and a driven wheel. The drive wheel is driven to rotate by the motor. The drive wheel and the driven wheel are connected by gear meshing. The drive wheel has a solder wire placement groove. The driven wheel has a circumferential protrusion. When the drive wheel and the driven wheel are gear meshed, the protrusion is directly opposite the solder wire placement groove, and the solder wire is pressed into the solder wire placement groove by the protrusion. The solder wire moves by the friction between the solder wire, the solder wire placement groove, and the protrusion. A pipe is provided on the side of the housing near the soldering gun. One end of the pipe is connected to the inside of the housing, and the other end is located above the soldering station and corresponds to the position of the wire harness positioning groove. The solder wire extends to the position to be soldered through the pipe.

3. The wire harness connection error prevention device according to claim 2, characterized in that, The slider is connected to the piston rod of the first cylinder, and the first cylinder drives the slider to slide up and down along the slide rail; the welding torch is connected to the slider through the welding torch bracket to achieve synchronous movement of the welding torch and the slider.

4. The wire harness connection error prevention device according to claim 3, characterized in that, The drive wheel is sleeved and fixed to the output shaft of the motor. The drive wheel includes a first bushing, on which the solder wire placement groove and the drive gear are circumferentially arranged. The driven wheel includes a second bushing, on which the protrusion and the driven gear are circumferentially arranged. When the drive gear and the driven gear mesh, the protrusion is directly opposite the position of the solder wire placement groove and presses the solder wire into the solder wire placement groove, so that the solder wire can be moved during the rotation of the drive gear and the driven gear.

5. The wire harness connection error prevention device according to claim 4, characterized in that, The base is also provided with a second pressing fixture, which includes a second cylinder. The piston rod of the second cylinder is connected to the end of the pipeline near the welding gun through a connecting bracket, and is used to control the downward pressing of the solder wire so that the solder wire can contact the LED light source product when the welding gun is welding.

6. The wire harness connection error prevention device according to claim 5, characterized in that, It also includes a solder wire support frame, one end of which is fixedly connected to the base, and the other end is provided with a crossbeam. A sleeve is fitted on the crossbeam, and the solder wire is wound around the outside of the sleeve. The sleeve can rotate along the crossbeam.

7. The wire harness connection error prevention device according to claim 6, characterized in that, The wire harness positioning slot includes a first wire harness positioning slot and a second wire harness positioning slot, which are arranged side by side on the top of one side of the soldering station. The first wire harness positioning slot is used to place the positive wire harness, and the second wire harness positioning slot is used to place the negative wire harness. The probe of the color sensor is facing the first wire harness positioning slot and / or the second wire harness positioning slot, and is used to detect the color of the wire harness in the first wire harness positioning slot and / or the second wire harness positioning slot.

8. The wire harness connection error prevention device according to claim 7, characterized in that, It also includes a first intermediate relay, a second intermediate relay, and a buzzer. The output terminal of the color sensor is connected to the first intermediate relay, the first output terminal of the first intermediate relay is connected to the welding assembly, the second output terminal of the first intermediate relay is connected to the second intermediate relay, and the normally open terminal of the second intermediate relay is connected to the buzzer.

9. The wire harness connection error prevention device according to claim 8, characterized in that, The system also includes a PLC controller. The positive wire harness is placed in the first wire harness positioning slot, and the negative wire harness is placed in the second wire harness positioning slot. Simultaneously, the foot switch is pressed, and the PLC controller performs the following operations according to a preset program: First, the color sensor transmits the detected wire harness color information to the first intermediate relay. When the wire harness color is correct, the first output terminal of the first intermediate relay is activated. At this time, the PLC controller controls the motor to start, causing the solder wire to extend. Simultaneously, the second cylinder controls the pipe near the welding gun to press down. Next, the PLC controller controls the piston rod of the first cylinder to extend, driving the slider downwards, which in turn causes the welding gun to slide downwards. Under the high temperature of the welding gun, the solder wire melts, welding the positive and negative wire harnesses onto the LED light source product. Finally, the PLC controller controls the first and second cylinders to return to their original states, completing one welding operation. When the wire harness color is incorrect, the second output terminal of the first intermediate relay is activated, the normally open terminal of the second intermediate relay becomes the normally closed terminal, and the buzzer sounds an alarm.

10. The wire harness connection error prevention device according to any one of claims 2 to 9, characterized in that, It also includes a smoke exhaust pipe, one end of which is fixed to one side of the welding torch and is used to remove the fumes generated during the welding process.

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