Photovoltaic module junction box lead welding detection machine and detection method thereof

Abstract

The invention discloses a photovoltaic module junction box lead welding detection machine and a detection method thereof, and relates to the field of photovoltaic equipment, the photovoltaic module junction box lead welding detection machine comprises a rack, a conveying line and a detection module, the detection module comprises a movement mechanism, an appearance detection mechanism and a take-up mechanism, and the appearance detection mechanism is used for photographing and detecting a welding part of a lead; the take-up mechanism comprises a hook claw used for hooking a lead, a pressure sensor and a driving assembly, the take-up mechanism further comprises a displacement sensor used for detecting the lifting displacement of the hook claw, and the driving assembly is used for stopping lifting when the numerical value of the pressure sensor reaches a set value. The initial pressure value and the maximum pressure value are set through the additionally arranged pressure sensor, the clamped and lifted lead is monitored in real time through the pressure sensor, and when the lead lifting strength of the lifting mechanism reaches the set maximum value, the driving assembly stops running; the situation that the lead is deformed due to too large stress or does not tilt due to too small stress is prevented, and the accuracy of lead welding detection is improved.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic equipment, and in particular to a photovoltaic component junction box lead welding detection machine and a detection method thereof. Background Art

[0002] As an important part of solar cell modules, photovoltaic junction box is a connector between the solar cell array formed by solar cell modules and the solar cell charging control device. The main function of photovoltaic junction box is to export the electric energy generated by solar cell modules through cables. The current generated by solar photovoltaic modules is exported and introduced into electrical equipment through wiring terminals and connectors inside the junction box.

[0003] The prior art patent number CN220690432 U discloses a photovoltaic module junction box welding detection device, including a visual mechanism and a clamping and clamping mechanism. The clamping and clamping mechanism includes a clamping unit and a clamping unit. The clamping unit includes a clamping block, a connecting rod and a clamping floating assembly, and the lead is clamped by the bottom end surface of the clamping block; the clamping unit includes a lifting cylinder, a clamping floating assembly and a clamping claw assembly, and the clamping claw assembly moves in the lead clamping direction through the lifting cylinder and the clamping floating assembly.

[0004] The above-mentioned prior art has the following problems in actual use: when the clamping unit clamps the lead, it lifts the lead by lifting the cylinder, but cannot judge the lifting height, so that the lead may be subjected to excessive lifting force, resulting in the original qualified lead being lifted and damaged or the unqualified lead not being lifted. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a photovoltaic module junction box lead welding detection machine to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a photovoltaic module junction box lead welding detection machine; include: frame; Conveyor line, used to convey junction boxes; The detection module includes a motion mechanism disposed on the frame and an appearance detection mechanism and a thread taking-up mechanism disposed on the output end of the motion mechanism, wherein the motion mechanism is used to drive the appearance detection mechanism and the thread taking-up mechanism to move; The appearance inspection mechanism is used to take photos of the welding parts of the leads; The thread picking mechanism includes a hook for hooking the lead, a pressure sensor and a drive assembly. The hook is installed on the output end of the drive assembly through the pressure sensor. The drive assembly is used to drive the hook to rise to pick up the lead. The thread picking mechanism also includes a displacement sensor for detecting the lifting and lowering displacement of the hook. The drive assembly is used to stop rising when the value of the pressure sensor reaches a set value.

[0007] Beneficial effect: The initial pressure value and the maximum pressure value are set by adding a pressure sensor, and the clamped and picked up lead is monitored in real time by the pressure sensor when picking up the lead. When the strength of the lifting mechanism to lift the lead reaches the set maximum value, the drive component stops running to prevent the lead from being deformed due to excessive force or not being lifted up due to insufficient force, thereby improving the accuracy of lead welding detection.

[0008] Preferably, the driving assembly includes an R-axis motor and a driving unit, the driving unit is assembled at the output end of the R-axis motor, the driving unit includes a vertical stepping module and a horizontal stepping module, the vertical stepping module and the horizontal stepping module are arranged vertically, and the pressure sensor is arranged at the free end of the horizontal stepping module.

[0009] Through the above-mentioned technical means, the R-axis motor is connected to the drive unit, and the angle of the clamp is adjusted according to the appearance detection mechanism so that the hook can be aligned with the tilted photovoltaic module panel, thereby greatly improving the practicality of the hook clamping.

[0010] Preferably, the number of the hooks, pressure sensors and drive units is four, and the four hooks are installed on different drive components through the pressure sensors, and two of the hooks cooperate to grab and lift a lead wire.

[0011] Preferably, the conveyor line includes a crossbeam installed inside a frame and a plurality of conveyor belts detachably installed on the crossbeam. The plurality of conveyor belts are arranged transversely, and a transmission shaft passes through the same end of the conveyor belts, and a conveying motor is connected to one end of the transmission shaft.

[0012] Through the above-mentioned technical means, multiple conveyor belts are connected through a transmission shaft, so that multiple conveyor belts can be synchronously operated by one driving source, reducing the use of driving sources and thus reducing production costs.

[0013] Preferably, two groups of positioning components are provided on the conveyor line, and the two groups of positioning components are respectively slidably placed on the bottom of the beam and the side of the conveyor line through linear operation modules.

[0014] Preferably, the positioning assembly comprises two platforms that move relative to each other and are arranged on the linear motion mechanism, and at least two positioning wheels are vertically mounted on each platform.

[0015] Through the above-mentioned technical means, two sets of positioning wheels are used to position the four sides of the photovoltaic module to prevent the photovoltaic module from tilting, improve the accuracy of detection, and strengthen the stability of the photovoltaic module on the conveyor line, effectively preventing the photovoltaic module from shifting in position due to the lifting force when the lead is lifted, thereby improving the stability during transportation and lifting.

[0016] Preferably, the motion mechanism includes a transverse movement module, a frame and a three-axis motion module. The frame is on top of the transverse movement module and moves back and forth left and right inside the frame following the transverse movement module. The three-axis motion module is placed on the frame.

[0017] Preferably, the three-axis motion module includes an X-axis motion unit, a Y-axis motion unit, and a Z-axis motion unit. The X-axis motion unit is meshed and assembled on the top of the frame, the Y-axis motion unit is meshed and assembled on the top of the X-axis motion unit, and the Z-axis motion unit is assembled on the free end of the Y-axis motion unit. The appearance detection mechanism and the thread picking mechanism are respectively assembled on the front and rear of the Z-axis motion unit.

[0018] Preferably, the appearance detection mechanism comprises a camera, a lens and a light source, and the camera, the lens and the light source are arranged in sequence from top to bottom on the Z-axis motion unit.

[0019] A method for detecting welding of lead wires of a photovoltaic module junction box comprises the following steps: S1. Take a photo inspection of the lead welding parts of the junction box on the conveyor line through the appearance inspection mechanism. If the solder joint length value is greater than or equal to the set solder joint length standard value, it is judged to be qualified; S2. Perform strength test on the qualified lead wire detected in S1 through the wire picking mechanism. The hook hooks the lead wire and moves upward. When the value of the pressure sensor reaches the set initial pressure value A, the displacement sensor records the value X of the current position and continues to move. When the value of the pressure sensor reaches the set maximum pressure value B, the movement stops and the current position value Y is recorded. When YX>Z standard value, it is judged as unqualified, otherwise it is judged as qualified. If the pressure sensor value fails to reach the set initial pressure value A when the driving component moves upward to the limit position, it is judged as unqualified. S3. Perform a second photo inspection on the leads that have passed the inspection in S2, and judge them as qualified if the solder joint length value is greater than or equal to the set solder joint length standard value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the photovoltaic module conveying and positioning of the present invention.

[0022] Figure 3 It is a schematic diagram of the conveyor line structure from top view of the present invention.

[0023] Figure 4 It is a schematic diagram of the conveying structure of the present invention when viewed from above.

[0024] Figure 5 It is a schematic diagram of the motion mechanism structure of the present invention.

[0025] Figure 6 It is a schematic diagram of the assembly structure of the appearance inspection equipment and the thread picking mechanism of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the three-axis motion module of the present invention.

[0027] Figure 8 It is a schematic diagram of the structure of the appearance inspection equipment of the present invention.

[0028] Fig. 9 It is a structural schematic diagram of the thread taking-up mechanism of the present invention.

[0029] Fig.10 It is a schematic diagram of the connection between the pressure sensor and the hook claw of the present invention.

[0030] The accompanying drawings are marked as follows: 1. frame; 2. conveyor line; 21. beam; 22. conveyor belt; 23. transmission shaft; 24. conveying motor; 3. transverse movement module; 4. frame; 5. three-axis motion module; 51. X-axis motion unit; 52. Y-axis motion unit; 53. Z-axis motion unit; 6. appearance detection mechanism; 61. camera; 62. lens; 63. light source; 7. thread picking mechanism; 71. hook; 72. pressure sensor; 73. drive assembly; 731. R-axis motor; 732. drive unit; 7321. vertical stepping module; 7322. lateral stepping module; 74. displacement sensor; 8. positioning assembly; 81. platform; 82. positioning wheel. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] The present invention provides a photovoltaic module junction box lead welding detection machine; Embodiment 1, as Figure 1-10 As shown, a photovoltaic module junction box lead welding detection machine is provided, including a frame 1, a conveyor line 2, and a detection module.

[0033] A photovoltaic module feed port is provided at the bottom of the front end of the rack 1, and the feed port is used for both entry and removal of photovoltaic modules. A conveyor line 2 is arranged inside the rack 1 and aligned with the feed port for transporting photovoltaic modules.

[0034] The detection module includes a motion mechanism arranged on the frame 1 and an appearance detection mechanism 6 and a thread picking mechanism 7 arranged on the output end of the motion mechanism. The motion mechanism is used to drive the appearance detection mechanism 6 and the thread picking mechanism 7 to move. The appearance detection mechanism 6 and the thread picking mechanism 7 are symmetrically arranged on the motion mechanism.

[0035] The appearance inspection mechanism 6 is used to take photos and inspect the welding parts of the leads.

[0036] The thread picking mechanism 7 includes a hook claw 71 for hooking the lead, a pressure sensor 72 and a drive assembly 73. The hook claw 71 is installed on the output end of the drive assembly 73 through the pressure sensor 72. The drive assembly 73 is used to drive the hook claw 71 to rise to pick up the lead. The thread picking mechanism 7 also includes a displacement sensor 74 for detecting the lifting and lowering displacement of the hook claw 71. The drive assembly 73 is used to stop rising when the value of the pressure sensor 72 reaches a set value.

[0037] The detection process includes the following steps: S1. Take a photo inspection of the lead welding part of the junction box on the conveyor line 2 through the appearance inspection mechanism 6. If the solder joint length value is greater than or equal to the set solder joint length standard value, it is judged to be qualified; S2. The wire that has passed the S1 test is tested for strength by the wire picking mechanism 7. The hook 71 hooks the wire and moves upward. When the value of the pressure sensor 72 reaches the set initial pressure value A, the displacement sensor 74 records the value X of the current position and continues to move. When the value of the pressure sensor 72 reaches the set maximum pressure value B, the movement stops and the current position value Y is recorded. When YX>Z standard value, it is judged as unqualified, otherwise it is judged as qualified. If the value of the pressure sensor 72 fails to reach the set initial pressure value A when the driving component 73 moves upward to the limit position, it is judged as unqualified. S3. Use the appearance inspection mechanism 6 to perform a second photo inspection on the leads that have passed the inspection in S2. If the solder joint length value is greater than or equal to the set solder joint length standard value, it is determined to be qualified.

[0038] The initial pressure value and the maximum pressure value are set by the additional pressure sensor 72. When picking up the lead, the pressure sensor 72 is used to monitor the clamped and picked up lead in real time. When the strength of the lifting mechanism to lift the lead reaches the set maximum value, the drive component 73 stops running to prevent the lead from being deformed due to excessive force or not being lifted up due to insufficient force, thereby improving the accuracy of lead welding detection.

[0039] In this embodiment, the driving assembly 73 includes an R-axis motor 731 and a driving unit 732. The driving unit 732 is assembled at the output end of the R-axis motor 731. The driving unit 732 includes a vertical stepping module 7321 and a horizontal stepping module 7322. The vertical stepping module 7321 and the horizontal stepping module 7322 are arranged vertically, and the pressure sensor 72 is set at the free end of the horizontal stepping module 7322.

[0040] The R-axis motor 731 can rotate the angle of the driving unit 732 so that the driving unit 732 corresponds to the lead and clamps it and lifts it up. The R-axis motor 731 can be used to align the driving unit 732 with the inclined terminal box lead, which greatly improves the practicality of the clamp. When clamping, the vertical stepping module 7321 pushes down the horizontal stepping module 7322. At this time, the horizontal stepping module 7322 pushes out the pressure sensor 72 and the hook claw 71, so that the two hook claws 71 cooperate to clamp the lead, and then the lifting process is performed, and the strength of the lead is monitored by the pressure sensor 72 during lifting.

[0041] In this implementation, if Figure 2 As shown, the conveyor line 2 includes a crossbeam 21 installed inside the frame 1 and a plurality of conveyor belts 22 detachably installed on the crossbeam 21. The plurality of conveyor belts 22 are arranged horizontally, and a transmission shaft 23 passes through the same end of the conveyor belts 22. One end of the transmission shaft 23 is connected to a conveying motor 24. The operation of the plurality of conveyor belts 22 can be realized through a transmission shaft 23 and is controlled by the conveying motor 24, thereby reducing the use of a driving source and thus reducing production costs.

[0042] In this implementation, if Figure 3 , 4 As shown, two groups of positioning components 8 are arranged on the conveyor line 2, and the two positioning components 8 are respectively slidably placed on the bottom of the beam 21 and the side of the conveyor line 2 through a linear operation module, wherein the positioning component 8 includes two relatively moving platforms 81 arranged on a linear motion mechanism, and at least two positioning wheels 82 are vertically installed on each platform 81.

[0043] Furthermore, the linear motion module includes a servo motor, a pulley, a belt, a connecting block and a linear guide rail. The belt is arranged at the bottom of the crossbeam 21 and the side of the conveyor belt 22 so that the two belts form a cross shape. The connecting block is diagonally arranged with respect to the center line of the belt. The pulley is driven by the servo motor to drive the belt to rotate. The rotating belt drives the two connecting blocks to move relatively synchronously. The platform 81 is connected to the linear guide rail and the platform 81 is connected to the connecting block. The rotating belt makes the platforms 81 at both ends approach or move away from each other, so that the positioning wheel 82 contacts the photovoltaic component, and the four sides of the photovoltaic component are positioned and corrected so that the photovoltaic component is located in the middle of the conveyor line 2. The abutting positioning wheel 82 prevents the photovoltaic component from tilting, improves the accuracy of detection, and strengthens the stability of the photovoltaic component on the conveyor line, effectively preventing the photovoltaic component from being displaced due to the lifting force when the lead is lifted, and improves the stability in the conveying and lifting states.

[0044] In this embodiment, if Figure 5 As shown, the motion mechanism includes a transverse movement module 3, a frame 4 and a three-axis motion module 5. The frame 4 is on the top of the transverse movement module 3 and follows the transverse movement module 3 to reciprocate left and right inside the frame 1. The three-axis motion module 5 is placed on the frame 4.

[0045] Among them, the three-axis motion module 5 includes an X-axis motion unit 51, a Y-axis motion unit 52, and a Z-axis motion unit 53. The X-axis motion unit 51 is meshed and assembled on the top of the frame 4 to move in the front and back directions in the frame. The Y-axis motion unit 52 is meshed and assembled on the top of the X-axis motion unit 51 to move in the left and right directions in the frame. The Z-axis motion unit 53 is assembled in the free end frame of the Y-axis motion unit 52 to move in the up and down directions. The appearance detection mechanism 6 and the thread picking mechanism 7 are respectively assembled on the front and back of the Z-axis motion unit 53.

[0046] Further, such as Figure 6 , Figure 7 As shown, the X-axis motion unit 51 and the Y-axis motion unit 52 are both moved by a servo motor, a gear, a rack and a guide rail, and the Z-axis motion unit 53 is moved by a servo motor, a lead screw and a guide rail.

[0047] In this embodiment, if Figure 8 As shown, the appearance inspection mechanism 6 includes a camera 61, a lens 62 and a light source 63. The light source 63 is used to fill in the light for the welded leads. The camera 61 and the lens 62 are used to take pictures to locate the position of the lead welding. At the same time, whether the welding is qualified is judged based on whether there is obvious damage on the appearance of the welded leads.

[0048] The working process and principle of this embodiment are as follows: The conveying motor 24 drives the transmission shaft 23 to operate, so that the multiple conveyor belts 22 run synchronously to convey the photovoltaic module with the welding junction box until the photovoltaic module completely enters the rack 1. At this time, the linear motion module drives the platforms 81 at both ends to approach each other until the positioning wheel 82 contacts the side of the photovoltaic module, and the four sides of the photovoltaic module are positioned and fixed; Then, the motion mechanism moves the appearance inspection mechanism 6 to the junction box position, and detects the length of the welding point of the welding lead of the junction box through the camera 61, lens 62 and light source 63 provided in the appearance inspection mechanism 6 to determine whether the length of the welding point is qualified; When the lead welding point length is unqualified, the frame 1 is removed by the conveyor belt 22; When the length of the lead welding point is qualified, the wire picking mechanism 7 is moved to the lead welding position of the junction box according to the positioning image of the appearance detection mechanism 6 through the lateral movement module 3, the X-axis motion unit 51, the Y-axis motion unit 52, and the Z-axis motion unit 53. At this time, the vertical stepping module 7321 pushes down the horizontal stepping module 7322. At this time, the horizontal stepping module 7322 pushes out the pressure sensor 72 and the hook claw 71, so that the two hook claws 71 cooperate to clamp the lead, and then perform the lifting process; When the value of the pressure sensor 72 reaches the set initial pressure value A, the displacement sensor 74 records the value X of the current position and continues to move. When the value of the pressure sensor 72 reaches the set maximum pressure value B, the movement stops and the current position value Y is recorded. When YX>Z standard value, it is judged as unqualified, otherwise it is judged as qualified. If the value of the pressure sensor 72 fails to reach the set initial pressure value A when the driving component 73 moves upward to the limit position, it is judged as unqualified. The leads with unqualified strength are removed from the rack 1 by the conveyor belt 22, and the leads with qualified strength are subjected to secondary photo inspection. If the solder joint length value is greater than or equal to the set solder joint length standard value, it is judged to be qualified.

[0049] Embodiment 2 differs from Embodiment 1 in that the number of hooks 71, pressure sensors 72 and drive units 732 are all four, and the four hooks 71 are installed on different drive components 73 through the pressure sensors 72, wherein two hooks 71 cooperate to grab and lift one lead, and the four hooks 71 do not affect each other, wherein two hooks 71 cooperate to grab and lift one lead, and the two leads can be detected simultaneously, thereby improving the detection efficiency.

[0050] Embodiment 3 differs from Embodiment 1 in that the positioning assembly 8 includes a stopper and a suction cup. The stopper is arranged at the end of the conveyor line 2, and the suction cup is arranged at the bottom of the conveyor line 2. When the conveyor line 2 completes the conveyance of the photovoltaic assembly, the stopper is used for blocking and positioning, and then the suction cup is used to adsorb and fix the bottom of the photovoltaic assembly to prevent the photovoltaic assembly from being displaced due to the lifting force when the lead is lifted.

[0051] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left" and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. Photovoltaic module junction box lead welding detection machine, characterized in that: include: Rack(1); A conveyor line (2) for conveying the junction box; The detection module comprises a motion mechanism disposed on a frame (1) and an appearance detection mechanism (6) and a thread taking-up mechanism (7) disposed on an output end of the motion mechanism, wherein the motion mechanism is used to drive the appearance detection mechanism (6) and the thread taking-up mechanism (7) to move; The appearance inspection mechanism (6) is used to take photos of the welding parts of the leads for inspection; The thread picking mechanism (7) comprises a hook claw (71) for hooking a lead wire, a pressure sensor (72) and a drive assembly (73); the hook claw (71) is mounted on an output end of the drive assembly (73) via the pressure sensor (72); the drive assembly (73) is used to drive the hook claw (71) to rise so as to pick up the lead wire; the thread picking mechanism (7) further comprises a displacement sensor (74) for detecting the lifting displacement of the hook claw (71); the drive assembly is used to stop rising when the value of the pressure sensor reaches a set value.

2. The photovoltaic module junction box lead welding detection machine according to claim 1 is characterized in that: The driving assembly (73) comprises an R-axis motor (731) and a driving unit (732), wherein the driving unit (732) is mounted on the output end of the R-axis motor (731), and the driving unit (732) comprises a vertical stepping module (7321) and a horizontal stepping module (7322), wherein the vertical stepping module (7322) and the horizontal stepping module (7322) are arranged vertically, and the pressure sensor (72) is arranged at the free end of the horizontal stepping module (7322).

3. The photovoltaic module junction box lead welding detection machine according to claim 2 is characterized in that: The number of the hook claws (71), the pressure sensor (72), and the drive unit (732) are all four, and the four hook claws (71) are installed on different drive components (73) through the pressure sensor (72), and two of the hook claws (71) cooperate to grab and lift a lead wire.

4. The photovoltaic module junction box lead welding detection machine according to claim 1, 2 or 3, characterized in that: The conveyor line (2) comprises a crossbeam (21) mounted inside the frame (1) and a plurality of conveyor belts (22) detachably mounted on the crossbeam (21), wherein the plurality of conveyor belts (22) are arranged transversely and a transmission shaft (23) passes through the same end of the conveyor belts (22), and a conveying motor (24) is connected to one end of the transmission shaft (23).

5. The photovoltaic module junction box lead welding detection machine according to claim 4, characterized in that: Two groups of positioning components (8) are provided on the conveyor line (2), and the two groups of positioning components (8) are respectively slidably placed on the bottom of the crossbeam (21) and the side of the conveyor line (2) through a linear operation module.

6. The photovoltaic module junction box lead welding detection machine according to claim 5, characterized in that: The positioning assembly (8) comprises two platforms (81) arranged on a linear motion mechanism and capable of relatively moving, and at least two positioning wheels (82) are vertically mounted on each platform (81).

7. The photovoltaic module junction box lead welding detection machine according to claim 1, 2 or 3, characterized in that: The motion mechanism comprises a transverse movement module (3), a frame (4) and a three-axis motion module (5); the frame (4) is on top of the transverse movement module (3) and follows the transverse movement module (3) to reciprocate left and right inside the frame (1); and the three-axis motion module (5) is placed on the frame (4).

8. The photovoltaic module junction box lead welding detection machine according to claim 7, characterized in that: The three-axis motion module (5) comprises an X-axis motion unit (51), a Y-axis motion unit (52), and a Z-axis motion unit (53); the X-axis motion unit (51) is meshed and assembled on the top of the frame (4); the Y-axis motion unit (52) is meshed and assembled on the top of the X-axis motion unit (51); the Z-axis motion unit (53) is assembled on the free end of the Y-axis motion unit (52); and the appearance detection mechanism (6) and the thread picking mechanism (7) are respectively assembled on the front and rear of the Z-axis motion unit (53).

9. The photovoltaic module junction box lead welding detection machine according to claim 8, characterized in that: The appearance detection mechanism (6) comprises a camera (61), a lens (62) and a light source (63), and the camera (61), the lens (62) and the light source (63) are arranged in sequence from top to bottom on the Z-axis motion unit (53).

10. A method for detecting welding of lead wires in a photovoltaic module junction box, characterized in that: The photovoltaic module junction box lead welding detection machine according to any one of claims 1 to 9 comprises the following steps: S1. The appearance inspection mechanism (6) takes a photo inspection of the lead welding part of the junction box on the conveyor line (2). If the solder joint length value is greater than or equal to the set solder joint length standard value, it is judged to be qualified; S2. The wire that has passed the S1 test is subjected to strength testing by the wire picking mechanism (7). The hook hooks the wire and moves upward. When the pressure sensor value reaches the set initial pressure value A, the displacement sensor records the current position value X and continues to move. When the pressure sensor value reaches the set maximum pressure value B, the movement stops and the current position value Y is recorded. When YX>Z standard value, it is judged as unqualified, otherwise it is judged as qualified. If the pressure sensor value fails to reach the set initial pressure value A when the drive assembly (73) moves upward to the limit position, it is judged as unqualified. S3. Perform a second photo inspection on the qualified leads in S2, and judge them as qualified if the solder joint length value is greater than or equal to the set solder joint length standard value.

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