Automobile wire harness terminal riveting continuous visual detection equipment and method

Abstract

The application discloses a kind of continuous visual inspection equipment and method of automobile wire harness terminal riveting, it is related to automobile wire harness processing detection technical field.The equipment of the present application includes conveying belt, terminal card frame, electromagnetic box, air suction disc, photoelectric probe, vision collector, rejection mechanism and recycling mechanism.Tapered convex is arranged at the bottom of terminal card frame and stainless steel bottom plate, air suction disc integrates pressure probe, magnet block and is communicated with negative pressure equipment, electromagnetic box relies on electromagnetic disk drive air suction disc lifting.The multistage stable structure of the present application adopts electromagnetic jacking, magnetic attraction positioning, negative pressure adsorption combined with gas flow rate feedback, eliminates the imaging blur caused by conveying vibration, and realizes continuous automatic detection by matching photoelectric pre-detection and downstream rejection mechanism.The detection method completes terminal quality screening through work station pre-checking, jacking, negative pressure positioning, image acquisition and defect sorting closed-loop process, which greatly improves the online detection accuracy and automation production efficiency of wire harness terminal.

Description

Technical Field

[0001] This invention relates to the field of automotive wiring harness processing and inspection technology, and in particular to a continuous visual inspection device and method for automotive wiring harness terminal riveting. Background Technology

[0002] After the riveting process is completed, automotive wiring harness terminals need to be inspected for defects such as riveting gaps, deformation, and missing materials using vision equipment. Existing continuous vision inspection relies on a conveyor belt to directly transport the terminal fixtures to a camera for image acquisition. During continuous operation of the conveyor belt, there are problems such as running vibration, conveyor inertial vibration, motor vibration, and tooling gap movement. A slight relative displacement will occur between the terminal fixtures and the camera, resulting in blurred detailed images of the riveting area captured by the camera. Small riveting defects cannot be identified, leading to a high rate of missed and false detections.

[0003] Furthermore, existing online inspection systems lack pre-station identification logic. Regardless of whether the terminal to be inspected is placed inside the fixture, the equipment will execute the entire positioning and imaging procedure. Empty fixtures will continuously occupy the inspection station, which not only lengthens the actual production cycle of the entire production line, but also keeps the execution components such as negative pressure, lifting, and imaging in an idle state for a long time, continuously generating unnecessary power consumption. Under the condition of batch and long-term production, the problem of energy waste is prominent, and it is impossible to meet the dual needs of increasing production capacity and energy-saving production.

[0004] In summary, existing continuous wire harness terminal visual inspection solutions suffer from shortcomings such as blurred imaging and insufficient defect recognition accuracy due to vibration interference from the conveying system. At the same time, the lack of a pre-inspection mechanism at the workstation results in wasted production line cycle time and high idle energy consumption. The combination of these two factors creates a core technical problem in which it is difficult to simultaneously achieve both inspection accuracy and production energy efficiency in mass production scenarios. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A continuous visual inspection device for automotive wiring harness terminal riveting includes a conveyor belt, a terminal holder frame mounted on the conveyor belt, an electromagnetic box located below the conveyor belt, an air suction plate, and a photoelectric probe. A visual acquisition unit and a rejection mechanism located downstream of the visual acquisition unit are also configured above the conveyor belt. A recycling mechanism cooperating with the rejection mechanism is configured outside the conveyor belt. The visual acquisition unit is located directly above the air suction plate. The terminal holder frame has a placement slot for placing riveted terminals. The bottom of the terminal holder frame has a truncated cone protrusion and a stainless steel base plate surrounding the truncated cone protrusion. A through hole is vertically inserted along the axis of the truncated cone protrusion, connecting to the placement slot. The air suction plate has an air suction conical groove that cooperates with the truncated cone protrusion. Multiple pressure probes and multiple magnets are staggered and embedded on the top surface of the air suction plate. The air suction plate is connected to a negative pressure device via a hose. A gas flow rate sensing module is configured on the suction side of the negative pressure device. The electromagnetic box contains an electromagnet, a magnet disk that cooperates with the magnetic force of the electromagnet, and a connecting rod that rises and falls synchronously with the magnet disk. The top of the connecting rod is fixedly connected to the air suction plate.

[0006] Preferably, the perpendicular distance between the photoelectric probe detection path and the axis of the intake cone groove is the same as the spacing between the through holes of two adjacent terminal frames.

[0007] Preferably, the bottom plane dimension of the terminal card frame placement slot is larger than the bottom plane dimension of the riveted terminal.

[0008] Preferably, the magnetic attraction force when the magnetic disk and the magnetic disk are attracted is greater than the magnetic attraction force when the magnetic block and the stainless steel base plate with the truncated cone are attracted.

[0009] Preferably, the electromagnetic box includes a fixed frame and a sliding plate located above the fixed frame. The magnetic disk is mounted at the position of the fixed frame, and the magnetic disk is mounted at the position of the sliding plate. Multiple sliding rods are provided on the upper side of the fixed frame, and the sliding plate is slidably mounted on the sliding rods. An end cover is installed on the top of the electromagnetic box, and a bushing is located at the center of the end cover. The bottom end of a connecting rod is fixedly connected to the top side of the sliding plate, and the connecting rod moves through the bushing. A first spring is sleeved on the sliding rod, and the first spring is located between the fixed frame and the sliding plate.

[0010] Preferably, the front and rear ends of the placement slot of the terminal card frame are open, and the bottom surface of the placement slot is flush with the upper surface of the conveyor belt. The distance between the image acquisition area of ​​the vision acquisition device and the rejection action area of ​​the rejection mechanism matches the distance between the placement slots of two adjacent terminal card frames.

[0011] Preferably, the rejection mechanism includes a lifter, a lifting rod located at the output end of the lifter, a threaded sleeve fixed to the top side of the lifter, and a limiting frame. A push plate for rejecting non-compliant riveted terminals is fixedly connected to the bottom end of the lifting rod, wherein the lateral width of the push plate is smaller than the width of the open structure at the front and rear ends of the placement slot. The rejection mechanism is also equipped with a horizontal motor for driving the lifter to move. The output end of the horizontal motor is connected to a screw rod, the threaded sleeve is screwed onto the screw rod, and a bearing seat is installed at the end of the screw rod. The horizontal motor and the bearing seat are both fixedly mounted on the same top frame, and the limiting frame is slidably fitted with the top frame.

[0012] Preferably, the lowest point of the push plate's stroke is horizontally higher than the bottom surface of the placement slot and lower than the highest point of the riveting terminal inside the placement slot.

[0013] A continuous visual inspection method for automotive wiring harness terminal riveting includes the following steps: S1. Start the conveyor belt, which drives the terminal frame loaded with riveted terminals to move continuously along the conveying path.

[0014] S2. The terminal frame moves to the photoelectric probe detection station, and the photoelectric probe emits a detection beam upward to identify whether there are riveted terminals inside the placement slot.

[0015] S3. When the photoelectric probe does not detect the riveted terminal, the control system skips all actions of the electromagnetic box, negative pressure equipment, and vision acquisition device, and the conveyor belt continues to transport the device to the next terminal frame.

[0016] S4. After the photoelectric probe detects the riveted terminal, the terminal frame moves to the detection station directly above the suction plate, and the control system outputs a repulsive current to the electromagnetic disk in the electromagnetic box.

[0017] S5. The electric disk pushes the magnetic disk upward, and the connecting rod simultaneously drives the suction disk to rise and fit against the bottom of the terminal frame.

[0018] S6. The magnetic block on the top surface of the suction plate adsorbs the stainless steel base plate to complete the pre-positioning. After the pressure probe collects the contact pressure signal, the negative pressure device is started. The suction cone groove applies negative pressure to the riveting terminal through the through hole.

[0019] S7. The gas flow rate sensing module collects the gas flow rate of the negative pressure pipeline in real time. Based on the changes in the gas flow rate, it adjusts the output power of the negative pressure equipment. After the negative pressure gas flow rate reaches the standard, the vision acquisition device captures the image of the riveted terminal and completes the defect identification.

[0020] S8. When the image determines that the riveted terminal is qualified, the electromagnet switches the magnetic suction current to pull the magnet disk to reset, the suction disk disengages from the terminal holder frame, and the conveyor belt transports the terminal to the next process.

[0021] S9. If the negative pressure adsorption timeout is exceeded, the gas flow rate does not meet the standard, or the image determines that the riveted terminal is unqualified, the suction plate is reset, the conveyor belt transports the abnormal terminal to the rejection mechanism station, and the rejection mechanism pushes the riveted terminal into the recycling mechanism.

[0022] Compared with existing technologies, the beneficial effects of this invention are: 1. This invention utilizes a multi-dimensional composite stable limiting linkage structure, including electromagnetic lifting, magnetic pre-positioning, and negative pressure adsorption, to form a closed-loop stable position control through dual real-time feedback from a pressure probe and a gas flow rate sensing module. Furthermore, the multi-level limiting works together to offset the vibration of the conveyor belt and eliminate minor relative displacements, thus solving the problem of blurred details in riveted terminals from the root of the imaging and effectively improving the accuracy of identifying small riveting defects.

[0023] 2. This invention sets up a front-end photoelectric pre-inspection station, which uses a fixed-spacing matching design to identify empty fixtures. Terminal-free stations can directly skip the entire execution process of lifting, negative pressure, and taking pictures, which greatly reduces the energy consumption of the equipment under no-load conditions. At the same time, it eliminates the problem of invalid stations occupying the cycle time, and improves the effective detection efficiency of the entire production line without changing the main line conveyor speed, achieving the dual benefits of energy saving and speed increase. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the visual inspection device of the present invention.

[0025] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0026] Figure 3 This is a top view of the suction disc in this invention.

[0027] Figure 4 This is a side view of the removal mechanism and related components in this invention.

[0028] Wherein: 1-Transmission belt; 2-Terminal card frame; 201-Placement slot; 202-Conical protrusion; 203-Stainless steel base plate; 204-Through hole; 3-Electromagnetic box; 301-Fixing frame; 302-Electromagnetic disk; 303-End cover; 3031-Shaft sleeve; 304-Slide rod; 305-Slide disk; 306-First spring; 307-Magnetic disk; 308-Connecting rod; 4-Suction disk; 401-Suction cone groove; 402-Inner through hole; 403-Outer air nozzle; 404-Pressure... Force probe; 405-Magnet block; 5-Negative pressure device; 501-External branch pipe; 6-Gas flow rate sensing module; 7-Hose; 8-Vision acquisition device; 9-Photoelectric probe; 10-Riveting terminal; 11-Rejection mechanism; 1101-Lifter; 1102-Lifting rod; 1103-Push plate; 1104-Threaded sleeve; 1105-Limit frame; 1106-Top frame; 1107-Horizontal motor; 1108-Screw; 1109-Bearing seat; 12-Recycling mechanism. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Example

[0030] This invention discloses a continuous visual inspection device for automotive wiring harness terminal riveting. Its core lies in solving the impact of vibration during conveyor belt operation on visual inspection through a multi-stage adsorption and feedback mechanism. The specific structural design is as follows: Combination Figure 1 , Figure 2 The surface of the conveyor belt 1 has evenly distributed positioning slots, and terminal frames 2 are installed inside the positioning slots. The terminal frames 2 are used to support the riveted terminals 10 to be tested. The terminal frames 2 have placement slots 201, which are open at both ends to form an open structure. The bottom plane dimension of the placement slot 201 is larger than the bottom plane dimension of the riveted terminal 10, and the bottom surface of the placement slot 201 is at the same level as the upper surface of the conveyor belt 1. The bottom center of the terminal frame 2 has an integrally formed truncated cone protrusion 202. A stainless steel base plate 203 is fixed around the outside of the truncated cone protrusion 202. A through hole 204 is formed on the central axis of the truncated cone protrusion 202, which vertically penetrates the truncated cone protrusion 202 and communicates with the placement slot 201.

[0031] Combination Figure 1 , Figure 2An electromagnetic box 3 is installed below the terminal card frame 2 along the travel path of the conveyor belt 1. A fixing frame 301 is fixedly installed on the bottom side inside the electromagnetic box 3, and an electric disk 302 is mounted at the center of the fixing frame 301. An end cover 303 (made of non-magnetic material, such as aluminum) is sealed on the top of the electromagnetic box 3. A bushing 3031 is machined at the center of the end cover 303, and a connecting rod 308 passes through the bushing 3031. Multiple sliding rods 304 are vertically fixed on the upper side of the fixing frame 301. A sliding plate 305 is slidably fitted on the outside of the sliding rods 304. A magnetic disk 307 is embedded in the bottom surface of the sliding plate 305. A first spring 306 is fitted between the fixing frame 301 and the sliding plate 305. The first spring 306 prevents the electric disk 302 from resetting and colliding when it magnetically attracts the magnetic disk 307. The bottom end of the connecting rod 308 is fixedly connected to the top surface of the sliding plate 305, and the top end of the connecting rod 308 extends out of the electromagnetic box 3 and fixes the suction plate 4.

[0032] Combination Figure 1 , Figure 2 , Figure 3 A suction cone groove 401 is formed at the center of the top surface of the suction plate 4. The conical contour of the suction cone groove 401 is perfectly matched with the cone protrusion 202 at the bottom of the terminal frame 2 (a buffer rubber layer can be provided on the inner wall of the suction cone groove 401 or the outer surface of the cone protrusion 202 as needed). The bottom of the suction cone groove 401 is connected to the inner through hole 402. An external air nozzle 403 is formed on the side wall of the suction plate 4, and the external air nozzle 403 is connected to the hose 7. Several pressure probes 404 and magnets 405 are arranged alternately on the top surface of the suction plate 4. The pressure probes 404 are used to collect the contact pressure when the suction plate 4 is in contact with the stainless steel base plate 203. The magnets 405 rely on magnetic force to attract the stainless steel base plate 203 to achieve magnetic pre-positioning. The other end of the hose 7 is connected to the outer branch pipe 501 of the negative pressure device 5. A gas flow rate sensing module 6 is connected in series on the outer branch pipe 501. The gas flow rate sensing module 6 collects the gas flow rate inside the pipe in real time and transmits an electrical signal to the control system.

[0033] Combination Figure 2 When the electromagnet 302 is energized and outputs a repulsive force, a repulsive force is generated between the electromagnet 302 and the magnetic disk 307, pushing the slide 305, connecting rod 308, and suction disk 4 upward as a whole. When the electromagnet 302 switches current and generates a magnetic attraction force, the electromagnet 302 attracts the magnetic disk 307 downward, the slide 305 descends along the slide rod 304 to compress the first spring 306, and the suction disk 4 descends simultaneously to detach from the bottom of the terminal frame 2. The magnetic attraction force between the electromagnet 302 and the magnetic disk 307 is greater than the magnetic attraction force between the magnet 405 and the stainless steel base plate 203, ensuring that the reset action is not affected by the magnetic resistance between the magnet 405 and the stainless steel base plate 203.

[0034] Combination Figure 1 , Figure 2A photoelectric probe 9 is positioned upstream of the suction plate 4 on the conveyor belt 1. The photoelectric probe 9 emits a detection beam vertically upwards. The vertical distance between the photoelectric probe 9 and the central axis of the suction cone groove 401 is equal to the center distance between the through holes 204 of two adjacent terminal frame 2, ensuring that the terminal frame 2 stops precisely above the suction plate 4 after completing the pre-inspection travel of a fixed distance. A vision acquisition device 8 is mounted directly above the suction plate 4 on the conveyor belt 1. The vision acquisition device 8 is a high-definition industrial camera, and the camera's acquisition area is directly facing the riveting terminal 10 placed in the groove 201 below.

[0035] Combination Figure 1 , Figure 4 A rejection mechanism 11 is mounted downstream of the vision acquisition unit 8 on the conveyor belt 1, and a recycling mechanism 12 is mounted on the outer side of the conveyor belt 1. The rejection mechanism 11 includes a top frame 1106, a horizontal motor 1107 is fixed on one side of the top frame 1106, and a screw 1108 is connected to the output end of the horizontal motor 1107. A bearing seat 1109 is rotatably mounted at the end of the screw 1108, and the bearing seat 1109 is fixed on the other side of the top frame 1106. The screw 1108 is threaded into a threaded sleeve 1104, a lifter 1101 is mounted on the lower end of the threaded sleeve 1104, and a limit frame 1105 is mounted on the upper side of the threaded sleeve 1104. The limit frame 1105 slides and fits against the top frame 1106, restricting the rotation of the lifter 1101. The lower end of the lifting device 1101 outputs a lifting rod 1102, and the bottom end of the lifting rod 1102 is fixed with a push plate 1103. The horizontal width of the push plate 1103 is smaller than the opening width of the placement slot 201. The lowest point of the downward movement of the push plate 1103 is higher than the bottom of the placement slot 201, but lower than the top height of the riveting terminal 10. The distance between the image acquisition area of ​​the vision acquisition device 8 and the action area of ​​the push plate 1103 of the rejection mechanism 11 matches the center distance of the adjacent terminal frame 2 placement slot 201. When the defective riveting terminal 10 is conveyed to the rejection station, the push plate 1103 accurately pushes the material, pushing the defective product into the recycling mechanism 12.

[0036] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 The device of this invention relies on the electromagnetic box 3 to realize the automatic lifting and lowering of the suction plate 4, the magnet block 405 to complete the pre-positioning, the negative pressure device 5 to hold the riveting terminal 10 tightly through the suction cone groove 401 and the through hole 204, the gas flow rate sensing module 6 to provide feedback on the adsorption status, eliminate the imaging offset caused by the conveying vibration, the photoelectric probe 9 to pre-inspect the empty tooling to achieve energy saving, and the downstream rejection mechanism 11 to automatically sort out defective products, which is suitable for large-scale continuous online detection of automotive wiring harness terminals. Example

[0037] This invention presents a continuous visual inspection method for automotive wiring harness terminal riveting, the specific method of which is as follows: (a) Start the conveyor belt 1. The conveyor belt 1 runs continuously at a uniform speed, continuously conveying the terminal card frame 2 loaded with riveting terminals 10 forward along the preset straight conveying path. The control system simultaneously turns on the photoelectric probe 9, the gas flow rate sensing module 6, and the vision acquisition device 8 (standby power supply). The electromagnetic box 3, the negative pressure device 5, and the rejection mechanism 11 remain in a dormant standby state to reduce no-load energy consumption.

[0038] (ii) When the terminal frame 2 moves with the conveyor belt 1 to the pre-inspection station directly above the photoelectric probe 9, the photoelectric probe 9 emits a linear detection beam vertically upward. The beam passes through the through hole 204 and illuminates the internal area of ​​the placement slot 201. The control system determines whether the riveting terminal 10 is placed inside the placement slot 201 based on the beam reflection signal. If the riveting terminal 10 is not detected, the control system determines that the current station is empty and invalid, and directly locks the lifting program of the electromagnetic box 3, the evacuation program of the negative pressure device 5, and the photo taking program of the vision acquisition device 8 to not start. The conveyor belt 1 continues to drive the empty terminal frame 2 forward and directly enters the pre-inspection and identification process of the next terminal frame 2, reducing the energy consumption of meaningless equipment actions.

[0039] (III) If the beam reflection signal of the photoelectric probe 9 detects the presence of a riveted terminal 10 inside the placement slot 201, the control system records the workstation signal, and the conveyor belt 1 continues to transport the terminal frame 2 a fixed distance, so that the bottom cone protrusion 202 of the terminal frame 2 is precisely aligned with the top suction cone groove 401 of the suction disk 4. At this time, the conveyor belt 1 briefly stops transporting. The control system supplies a repulsive current to the electromagnet 302 inside the electromagnetic box 3. The electromagnet 302 generates a repulsive magnetic force that pushes the magnet disk 307 upward. The magnet disk 307 drives the slide 305 to slide upward along the slide rod 304. The slide 305 pushes the suction disk 4 upward as a whole through the connecting rod 308 until the top surface of the suction disk 4 is tightly attached to the bottom stainless steel base plate 203 of the terminal frame 2.

[0040] (iv) During the lifting and bonding process of the suction plate 4, the magnet block 405 embedded on the top surface and the stainless steel base plate 203 generate a magnetic adsorption force, which completes the initial positioning and fixing of the terminal frame 2 and avoids lateral displacement. Multiple pressure probes 404 on the top surface of the suction plate 4 synchronously collect the bonding contact pressure value. When the pressure value reaches the preset threshold, the control system triggers the negative pressure device 5 to start. The negative pressure device 5 generates negative pressure airflow. The airflow is transported to the external air nozzle 403 of the suction plate 4 along the outer branch pipe 501 and the hose 7. It enters the suction cone groove 401 through the inner through hole 402. The airflow passes through the central through hole 204 of the cone protrusion 202 and generates a downward negative pressure adsorption force on the riveted terminal 10 inside the placement groove 201, which firmly presses the riveted terminal 10 to the bottom of the placement groove 201 and eliminates the slight displacement caused by the conveying vibration.

[0041] (v) After the negative pressure device 5 is started, the gas flow velocity sensing module 6 installed on the external branch pipe 501 continuously collects the gas flow velocity data inside the pipeline in real time and continuously transmits the flow velocity electrical signal to the control system.

[0042] The control system compares the real-time flow rate with the preset minimum flow rate threshold: (1) If the real-time flow rate drops rapidly to the threshold or below, it is determined that the cone protrusion 202 and the suction cone groove 401 are properly sealed and adhered, and the rivet terminal 10 is stably adsorbed. (2) If the real-time flow rate is consistently higher than the threshold, it indicates that there are gaps in the bonding and the negative pressure adsorption is insufficient. The control system will automatically increase the output power of the negative pressure device 5 to increase the adsorption traction force. (2-1) If the flow rate drops to the standard threshold within the preset reference time, the system maintains the current negative pressure power for stable adsorption; (2-2) If the flow rate still does not meet the standard after the reference time, it is determined that there is an abnormality such as tooling misalignment or terminal placement deviation at the workstation. The control system directly cuts off the power supply to the negative pressure equipment 5 and simultaneously switches the current direction of the electromagnet 302. After the electromagnet 302 switches to magnetic current, the electromagnet 302 attracts the magnetic disk 307 downwards, the slide 305 slides downwards along the slide rod 304, and the connecting rod 308 drives the suction disk 4 to descend and detach from the bottom of the terminal holder frame 2, completing the reset. The conveyor belt 1 unlocks and continues to transport the abnormally attracted riveted terminals 10 to the downstream rejection mechanism 11 workstation to wait for sorting.

[0043] (vi) If the gas flow rate meets the standard and the adsorption is stable, the control system starts the vision acquisition device 8 above the conveyor belt 1. The vision acquisition device 8 captures a high-definition image of the riveting part of the riveting terminal 10. The image data is transmitted to the matching image processing unit in real time. The unit identifies various defects such as riveting gaps, terminal deformation, missing riveting material, and exposed wires.

[0044] When the image processing unit outputs a qualified judgment result, the control system switches the magnetic current of the electromagnet 302, the suction plate 4 resets and disengages from the terminal frame 2, the negative pressure device 5 stops and releases pressure synchronously, and the conveyor belt 1 unlocks and continuously transports the riveting terminal 10 to the subsequent assembly process.

[0045] When the image processing unit outputs the defective product judgment result, or when the negative pressure adsorption timeout fails to meet the standard, the suction plate 4 completes the reset, and the conveyor belt 1 transports the riveting terminal 10 to the corresponding station of the rejection mechanism 11.

[0046] The horizontal motor 1107 of the rejection mechanism 11 starts, driving the screw 1108 to rotate. The threaded sleeve 1104 moves laterally along the screw 1108, pushing the lifter 1101 to the open side of the placement slot 201. The lifter 1101 drives the lifting rod 1102 to extend downward, and the push plate 1103 moves downward to the height of the side of the riveted terminal 10. The horizontal motor 1107 drives the lifter 1101 to move laterally in the opposite direction. The push plate 1103 passes through the open of the placement slot 201 and pushes the defective riveted terminal 10 laterally out of the terminal holder 2. The defective terminal falls directly into the recycling mechanism 12 outside the conveyor belt 1 for collection.

[0047] After sorting is completed, the elevator 1101 and the horizontal motor 1107 are reset, waiting for the next group of defective products to be sorted. The conveyor belt 1 continues to transport the next terminal card frame 2 into a complete inspection cycle.

[0048] The complete testing method designed in this invention relies on photoelectric pre-inspection for energy saving, electromagnetic magnetic attraction negative pressure multi-stage stabilization, real-time flow rate feedback, image defect recognition, and automatic sorting to form a fully closed-loop automated process. No manual intervention is required throughout the process, eliminating the imaging blurring problem caused by conveying vibration from the root, and significantly improving the automation level and defect recognition accuracy of online inspection in the automotive wiring harness terminal riveting process. It is suitable for continuous high-speed production and inspection scenarios of large batches of wiring harness terminals.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous visual inspection device for automotive wiring harness terminal riveting, characterized in that: The testing equipment includes a conveyor belt (1), a terminal frame (2) mounted on the conveyor belt (1), an electromagnetic box (3) located below the conveyor belt (1), an air suction plate (4), and a photoelectric probe (9); A visual acquisition device (8) and a rejection mechanism (11) located downstream of the visual acquisition device (8) are also arranged above the conveyor belt (1). A recycling mechanism (12) cooperating with the rejection mechanism (11) is also arranged outside the conveyor belt (1). The visual acquisition device (8) is located directly above the suction plate (4). The terminal frame (2) is provided with a placement groove (201) for placing a riveted terminal (10). The bottom end of the terminal frame (2) is provided with a frustum protrusion (202) and a stainless steel base plate (203) surrounding the frustum protrusion (202). A through hole (204) is opened on the axis of the frustum protrusion (202) to vertically penetrate and connect to the placement groove (201). The suction plate (4) is provided with a suction cone groove (401) that cooperates with the cone protrusion (202). Multiple pressure probes (404) and multiple magnet blocks (405) are interleaved on the top surface of the suction plate (4). The suction plate (4) is connected to the negative pressure device (5) through a hose (7). The negative pressure device (5) is equipped with a gas flow rate sensing module (6) on the suction side. The electromagnetic box (3) is equipped with an electric disk (302), a magnetic disk (307) that cooperates with the magnetic force of the electric disk (302), and a connecting rod (308) that moves up and down synchronously with the magnetic disk (307). The top of the connecting rod (308) is fixedly connected to the suction disk (4).

2. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 1, characterized in that: The perpendicular distance between the detection path of the photoelectric probe (9) and the axis of the intake cone groove (401) is the same as the spacing between the through holes (204) of the two adjacent terminal card frames (2).

3. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 1, characterized in that: The bottom plane dimension of the placement slot (201) of the terminal card frame (2) is larger than the bottom plane dimension of the riveted terminal (10).

4. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 1, characterized in that: The magnetic attraction force when the magnetic disk (302) and the magnetic disk (307) are magnetically attracted is greater than the magnetic attraction force when the magnetic block (405) and the stainless steel base plate (203) of the conical protrusion (202) are magnetically attracted.

5. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 1, characterized in that: The electromagnetic box (3) is provided with a fixed frame (301) and a sliding plate (305) located above the fixed frame (301). The magnetic disk (302) is installed at the fixed frame (301) and the magnetic disk (307) is installed at the sliding plate (305). The upper side of the fixed frame (301) is provided with multiple slide rods (304), and the slide plate (305) is slidably mounted on the slide rods (304); The electromagnetic box (3) is equipped with an end cover (303) on the top. A bushing (3031) is provided at the center of the end cover (303). The bottom end of the connecting rod (308) is fixedly connected to the top side of the slide (305). The connecting rod (308) moves through the bushing (3031). A first spring (306) is sleeved on the slide rod (304), and the first spring (306) is located between the fixed frame (301) and the slide plate (305).

6. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 1, characterized in that: The front and rear ends of the placement slot (201) of the terminal card frame (2) are open structures, and the bottom surface of the placement slot (201) is flush with the upper surface of the conveyor belt (1). The distance between the image acquisition area of ​​the vision acquisition device (8) and the rejection action area of ​​the rejection mechanism (11) is matched with the distance between the placement slots (201) of the two adjacent terminal card frames (2).

7. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 6, characterized in that: The rejection mechanism (11) includes a lifter (1101), a lifting rod (1102) located at the output end of the lifter (1101), a threaded sleeve (1104) fixed to the top side of the lifter (1101), and a limiting frame (1105). The bottom end of the lifting rod (1102) is fixedly connected to a push plate (1103) for rejecting non-compliant riveted terminals (10). The lateral width of the push plate (1103) is smaller than the width of the open structure at the front and rear ends of the placement groove (201). The rejection mechanism (11) is also equipped with a horizontal motor (1107) for driving the elevator (1101) to move. The output end of the horizontal motor (1107) is connected to a screw (1108). The threaded sleeve (1104) is screwed onto the screw (1108). A bearing seat (1109) is installed at the end of the screw (1108). The horizontal motor (1107) and the bearing housing (1109) are both fixedly installed on the same top frame (1106), and the limiting frame (1105) is slidably installed with the top frame (1106).

8. The continuous visual inspection equipment for automotive wiring harness terminal riveting according to claim 7, characterized in that: The lowest point of the push plate (1103) is horizontally higher than the bottom surface of the placement groove (201) and lower than the highest point of the riveting terminal (10) inside the placement groove (201).

9. A continuous visual inspection method for automotive wiring harness terminal riveting, applied to the continuous visual inspection equipment for automotive wiring harness terminal riveting as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Start the conveyor belt (1), and the conveyor belt (1) drives the terminal frame (2) loaded with riveting terminals (10) to move continuously along the conveying path; S2. The terminal card frame (2) moves to the photoelectric probe (9) detection station, and the photoelectric probe (9) emits a detection beam upward to identify whether there is a riveted terminal (10) inside the placement slot (201). S3. When the photoelectric probe (9) does not detect the riveted terminal (10), the control system skips all actions of the electromagnetic box (3), negative pressure device (5), and vision acquisition device (8), and the conveyor belt (1) continues to transport to the next terminal card frame (2). S4. After the photoelectric probe (9) detects the riveted terminal (10), the terminal frame (2) moves to the detection station directly above the suction plate (4), and the control system outputs repulsive current to the electromagnetic disk (302) inside the electromagnetic box (3); S5. The electric disk (302) pushes the magnetic disk (307) upward, and the connecting rod (308) simultaneously drives the suction disk (4) to rise and fit the bottom of the terminal frame (2); S6. The top surface magnet block (405) of the suction plate (4) adsorbs the stainless steel base plate (203) to complete the pre-positioning. After the pressure probe (404) collects the contact pressure signal, the negative pressure device (5) is started. The suction cone groove (401) applies negative pressure to the riveting terminal (10) through the through hole (204). S7. The gas flow rate sensing module (6) collects the gas flow rate of the negative pressure pipeline in real time. According to the change of gas flow rate, the output power of the negative pressure device (5) is adjusted. After the negative pressure gas flow rate reaches the standard, the vision acquisition device (8) takes a picture of the riveted terminal (10) and completes the defect identification. S8. When the image determines that the riveted terminal (10) is qualified, the electric disk (302) switches the magnetic current to pull the magnetic disk (307) to reset, the suction disk (4) disengages from the terminal card frame (2), and the conveyor belt (1) transports the terminal to the next process. S9. When the negative pressure adsorption timeout, the gas flow rate does not meet the standard, or the image determines that the riveting terminal (10) is unqualified, the suction plate (4) is reset, the conveyor belt (1) transports the abnormal terminal to the rejection mechanism (11) station, and the rejection mechanism (11) pushes the riveting terminal (10) into the recycling mechanism (12).

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