Bumper paint surface defect detection device and detection method

Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to a bumper paint surface defect detection device and method. The bumper paint surface defect detection device comprises a rail type conveyor and a tunnel type detection table; the device further comprises a follow-up mechanism, the bumper is installed on the follow-up mechanism, and the follow-up mechanism is used for adjusting the relative angle between the bumper and the tunnel type detection table. Through arrangement of the follow-up assembly, in the bumper transportation process, the bumper swings in the horizontal direction in the detection process through meshing transmission of the first transmission wheel and the swing rack, through swing operation, curved surfaces at the two ends of the bumper enter the detection range of the machine vision detection module, and the detection precision of the bumper is improved. And the same position is shot at different angles for many times, so that the detection efficiency of the paint surface defects of the bumper is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment, and in particular to a bumper paint surface defect detection device and a detection method. Background Art

[0002] Bumper paint defect detection is an important quality control link in the bumper production process. It can ensure the integrity and aesthetics of the paint surface of the car bumper during the production process. By using advanced detection technology, scratches, dents, color differences and other defects on the paint surface can be discovered and repaired in a timely manner, thereby improving the overall quality of the product.

[0003] With the increasing intelligence of the automobile manufacturing industry, the automation of bumper paint defect detection has also been significantly improved. Bumper automated detection technology can automatically identify and classify various defects on the bumper paint surface by integrating advanced image processing technology and machine vision algorithms, and realize rapid positioning and accurate measurement of defects. This technology usually includes high-resolution cameras, lighting systems, image acquisition cards, and dedicated image processing software. In practical applications, the bumper surface image is first captured by a camera, and then the image is analyzed using image processing software. The defect area is identified through an algorithm, and the defect type and severity are classified according to preset standards. In addition, some advanced systems can also combine machine learning technology to improve the accuracy and efficiency of detection through continuous learning and optimization. In this way, the detection process is not only efficient, but also the accuracy rate has been greatly improved, greatly reducing the errors and costs of manual detection.

[0004] For example, a device for detecting surface defects of automobile bumpers is disclosed in the related art, and the application number is CN2023210829720. The scheme includes a guide rail, a bracket installed on the guide rail for hanging the automobile bumper, a tunnel-type machine is arranged across the guide rail, and an image acquisition device for acquiring the surface image of the automobile bumper is installed on the tunnel-type machine. The image acquisition device includes an imaging module and an imaging adaptive mechanism that enables the imaging module to automatically follow the change of the curvature of the surface of the automobile bumper. When using the device, there is no need to set up a large separate detection area, and without adding light sources and cameras, it can adapt to the detection of automobile bumpers of different models. However, in the actual application process, it is found that although the tunnel-type detection can greatly improve the detection rate in the batch detection process of the bumper, because the bumper is a three-dimensional structure and the bumper is fixedly installed on the bracket, the camera has different imaging accuracy on the bumper surface, which affects the probability of detecting defects on the bumper paint surface.

[0005] In view of this, the present invention proposes a bumper paint defect detection device and a detection method to solve the above technical problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a bumper paint defect detection device and a detection method.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a bumper paint defect detection device described in the present invention comprises a track conveyor and a tunnel detection platform;

[0008] The track conveyor is used to transport the bumper;

[0009] The tunnel-type inspection platform is located on the extension path of the track conveyor, and a machine vision inspection module is installed on the side of the tunnel-type inspection platform facing the tunnel-type inspection platform, and the machine vision inspection module is used to automatically detect the paint defects of the bumper;

[0010] It also includes a follow-up mechanism, the bumper is mounted on the follow-up mechanism, and the follow-up mechanism is used to adjust the relative angle between the bumper and the tunnel-type testing platform;

[0011] The following mechanism comprises a supporting shaft, a hanging bracket, a swing shaft and a swing rack;

[0012] The support shaft is fixedly mounted on the track conveyor, the bracket is rotatably mounted on the support shaft, and the bumper is detachably fixedly mounted on the bracket;

[0013] A swing shaft is vertically installed at the top of the bracket, a first transmission wheel is fixedly installed on the swing shaft, and a plurality of swing racks are fixedly installed in the tunnel-type detection platform, and the swing racks are located on both sides of the movement path of the first transmission wheel.

[0014] Preferably, the follower mechanism further includes a deflection shaft, a worm gear, a transmission worm and a deflection rack;

[0015] The rack comprises a frame body and a clamp, a horizontally arranged deflection shaft is rotatably mounted on the frame body, the clamp is fixedly mounted on the deflection shaft, and the bumper is detachably fixedly mounted on the clamp;

[0016] A worm wheel is fixedly mounted on the deflection shaft, a transmission worm is rotatably mounted on the frame, the transmission worm is meshingly connected with the worm wheel, a second transmission wheel is fixedly mounted on the transmission worm, and multiple sections of deflection racks are installed in the tunnel-type testing platform, and the deflection racks are located on both sides of the movement path of the second transmission wheel.

[0017] Preferably, a limit block is fixedly installed on the support shaft, and a limit slot is provided on the frame. In the initial state, the limit block is located in the limit slot. A lifting rail is fixedly installed on the tunnel-type detection, and the lifting rail is an arc-shaped structure with a high middle and low ends. A load-bearing block is fixedly installed on the top of the swing shaft, and the ends of the lifting rail are located on both sides of the movement path of the load-bearing block.

[0018] Preferably, a slip ring is sleeved on the load-bearing block, and the load-bearing block and the slip ring are connected via a rolling bearing.

[0019] Preferably, a first resetting elastic member and a second resetting elastic member are fixedly mounted on the frame, and the first resetting elastic member and the second resetting elastic member extend and are fixed on the supporting shaft and the deflection shaft respectively.

[0020] Preferably, the frame body comprises a top rod, a bottom rod and a telescopic member, two ends of the telescopic member are respectively connected to the top rod and the bottom rod, and the deflection shafts are all mounted on the telescopic member.

[0021] Preferably, the telescopic member is a combination of a cross-scissor bracket and a mounting block, and the deflection axis is mounted on the mounting block.

[0022] Preferably, the top rod and the bottom rod are both hingedly mounted with yaw rods, the yaw rods are divided into two groups, and the telescopic member is hingedly connected to the two groups of yaw rods.

[0023] Preferably, a telescopic rod is fixedly mounted on two adjacent mounting blocks.

[0024] A method for detecting bumper paint defects, the method comprising the following steps:

[0025] S1: The bumper is installed on the rack and transported by the track conveyor along the pre-set route. After the spraying and drying processes, it enters the paint defect detection process;

[0026] S2: As the track conveyor continues to operate, the load-bearing block on the swing shaft gradually moves to the lifting rail and contacts the lifting rail through the slip ring set at the bottom. Under the guidance of the lifting rail, the swing shaft pulls the top rod to rise;

[0027] S3: During the rising process of the push rod, the deflection rod is first deflected and then raised, pushing the telescopic parts to expand in the vertical direction and move away from each other in the horizontal direction, thereby separating the multiple bumpers mounted thereon from each other;

[0028] S4: As the track conveyor continues to operate, the first transmission wheel and the second transmission wheel successively contact the swing rack and the deflection rack, and then under the transmission of the swing shaft, the transmission worm, the worm wheel and the deflection shaft, the bumper swings horizontally and deflects vertically;

[0029] S5: During the swing and deflection of the bumper, the machine vision inspection module on the tunnel-type inspection table continuously performs machine vision recognition on the bumper, thereby realizing dynamic inspection of the bumper.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The bumper paint defect detection device and detection method described in the present invention, by setting a follower component, during the transportation of the bumper, the first transmission wheel and the swing rack are meshed and transmitted, so that the bumper swings in the horizontal direction during the detection process. The swinging operation not only makes the curved surfaces at both ends of the bumper enter the detection range of the machine vision detection module, but also further enhances the detection efficiency of the bumper paint defects by shooting the same position multiple times at different angles.

[0032] 2. The bumper paint defect detection device and detection method described in the present invention, through the rotation of the deflection axis, causes the bumper to rotate in a circular direction with the horizontal direction as the rotation axis. By adjusting the spacing, length and distribution pattern of the deflection rack, the deflection angle and deflection direction of the fixture can be effectively adjusted, so that the bumper can change the angle in the vertical direction, further increasing the range of the machine vision inspection module's shooting angle for the bumper, thereby improving the detection effect of bumper paint defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Figure 1 is a stereogram of the present invention;

[0035] Figure 2 It is a three-dimensional diagram of the follower mechanism in the present invention;

[0036] Figure 3 It is the assembly drawing of the frame and the yaw rod;

[0037] Figure 4 It is the assembly drawing of the telescopic member and the deflection axis;

[0038] Figure 5 yes Figure 4 A partial enlarged view of the middle part;

[0039] Figure 6 This is the assembly drawing of the clamp and bumper;

[0040] Figure 7 It is a schematic diagram of the limit slot;

[0041] Figure 8 It is a schematic diagram of the distribution of the swing rack and the deflection rack on the tunnel-type test bench;

[0042] Fig. 9 is a flow chart of the method of the present invention;

[0043] In the figure: 1. track conveyor; 11. tunnel inspection table; 2. support shaft; 21. swing shaft; 22. first transmission wheel; 23. swing rack; 24. deflection shaft; 25. worm gear; 26. transmission worm; 27. second transmission wheel; 28. deflection rack; 3. clamp; 31. top rod; 32. bottom rod; 33. cross-scissor bracket; 34. mounting block; 4. limit block; 41. limit groove; 42. lifting rail; 43. load-bearing block; 44. slip ring; 5. first reset elastic member; 51. second reset elastic member; 6. deflection rod; 7. telescopic rod. DETAILED DESCRIPTION

[0044] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0045] like Figures 1 to 8 As shown, a bumper paint defect detection device according to the present invention comprises a track conveyor 1 and a tunnel detection platform 11;

[0046] The track conveyor 1 is used to transport the bumper;

[0047] The tunnel-type inspection platform 11 is located on the extension path of the track-type conveyor 1, and a machine vision inspection module is installed on the side of the tunnel-type inspection platform 11 facing the tunnel-type inspection platform 11, and the machine vision inspection module is used to automatically detect the paint defects of the bumper;

[0048] It also includes a follow-up mechanism, the bumper is mounted on the follow-up mechanism, and the follow-up mechanism is used to adjust the relative angle between the bumper and the tunnel-type testing platform 11;

[0049] The following mechanism includes a support shaft 2, a hanger, a swing shaft 21 and a swing rack 23;

[0050] The support shaft 2 is fixedly mounted on the track conveyor 1, the bracket is rotatably mounted on the support shaft 2, and the bumper is detachably fixedly mounted on the bracket;

[0051] A swing shaft 21 is vertically installed at the top of the rack, a first transmission wheel 22 is fixedly installed on the swing shaft 21, and multiple sections of swing racks 23 are fixedly installed in the tunnel-type detection platform 11. The multiple sections of the swing racks 23 are located on both sides of the movement path of the first transmission wheel 22.

[0052] When inspecting the bumper for paint defects, the machine vision inspection function is used to perform photographic inspection of the bumper, which can effectively improve the inspection rate and accuracy, reduce the probability of missed defects, and reduce the labor intensity of the staff. During the machine vision inspection, in order to improve the shooting effect of the bumper with a certain curvature, the present invention sets a follow-up mechanism. During the process of photographing and inspecting the bumper by the tunnel-type inspection platform 11, the relative angle between the bumper and the tunnel-type inspection platform 11 is adjusted, so that the machine vision inspection module installed on the tunnel-type inspection platform 11 can take a more comprehensive and clear picture of the bumper, thereby further enhancing the detection effect of the paint defects of the bumper.

[0053] Specifically, the bumper is loaded on the bracket on the support shaft 2, and under the transportation of the track conveyor 1, it successively undergoes the spraying and drying processes and enters the paint surface inspection process. During the continuous transportation process, the first transmission wheel 22 on the swing shaft 21 gradually contacts the swing rack 23. Since the swing rack 23 is fixedly installed in the tunnel-type inspection platform 11, the first transmission wheel 22 is caused to rotate during the relative movement between the first transmission wheel 22 and the swing rack 23, thereby causing the swing shaft 21 to rotate. Since the swing rack 23 has multiple sections and is located on both sides of the movement path of the first transmission wheel 22 At the same time, at most one swing rack 23 is meshed with the first transmission wheel 22. By adjusting the spacing, length and distribution pattern of the swing racks 23, the rack can produce regular horizontal swings during transportation. During the swinging of the rack, the tunnel-type inspection platform 11 improves the inspection effect of the curved surfaces at both ends of the bumper. At the same time, during the swinging process, the angle between the bumper and the machine vision inspection module on the tunnel-type inspection platform 11 changes, so that the same position can be photographed multiple times at different angles, thereby effectively improving the detection efficiency of bumper paint defects.

[0054] The present invention sets a follower assembly, and during the transportation of the bumper, the first transmission wheel 22 and the swing rack 23 are meshed and transmitted, so that the bumper swings in the horizontal direction during the inspection process. The swinging operation not only makes the curved surfaces at both ends of the bumper enter the inspection range of the machine vision inspection module, but also further enhances the efficiency of detecting bumper paint defects by shooting the same position multiple times at different angles.

[0055] The follower mechanism further includes a deflection shaft 24, a worm gear 25, a transmission worm 26 and a deflection rack 28;

[0056] The rack includes a frame and a fixture 3, a horizontally arranged deflection shaft 24 is rotatably mounted on the frame, the fixture 3 is fixedly mounted on the deflection shaft 24, and the bumper is detachably fixedly mounted on the fixture 3;

[0057] A worm gear 25 is fixedly mounted on the deflection shaft 24, a transmission worm 26 is rotatably mounted on the frame, the transmission worm 26 is meshingly connected with the worm gear 25, a second transmission wheel 27 is fixedly mounted on the transmission worm 26, and multiple sections of deflection racks 28 are installed in the tunnel-type detection platform 11, and the deflection racks 28 are located on both sides of the movement path of the second transmission wheel 27.

[0058] In order to further increase the angle variation range between the bumper and the machine vision detection module, during the transportation of the bumper, the second transmission wheel 27 gradually meshes with the deflection rack 28 for transmission, thereby causing the transmission worm 26 installed on the frame to rotate, and the transmission worm 26 and the worm wheel 25 are both in a meshing state, so the rotation of the transmission worm 26 causes the worm wheel 25 and the deflection shaft 24 to rotate, and the fixture 3 is fixedly mounted on the deflection shaft 24, and the bumper is detachably fixed on the fixture 3, so the rotation of the deflection shaft 24 causes the bumper to rotate in a circular direction with the horizontal direction as the rotation axis, by adjusting the spacing, length and distribution of the deflection rack 28. The deflection angle and deflection direction of the clamp 3 can be effectively adjusted according to the law, so that the bumper can change the angle in the vertical direction, further increasing the range of the shooting angle of the bumper by the machine vision inspection module, thereby improving the detection effect of the paint defects of the bumper. It should be noted that in the present invention, since the swing rack 23 and the deflection rack 28 are misaligned, the horizontal swing and vertical deflection of the bumper can be carried out simultaneously or separately. In actual application, technical personnel in this field can adjust the horizontal swing and vertical deflection moments of the bumper by adjusting the arrangement position and spacing of the swing rack 23 and the deflection rack 28 on the transportation route.

[0059] As a preferred embodiment of the present invention, a limit block 4 is fixedly installed on the support shaft 2, and a limit groove 41 is provided on the frame. In the initial state, the limit block 4 is located in the limit groove 41. A lifting rail 42 is fixedly installed on the tunnel-type detection. The lifting rail 42 is an arc-shaped structure with a high middle and low ends. A load-bearing block 43 is fixedly installed on the top of the swing shaft 21, and the ends of the lifting rail 42 are located on both sides of the movement path of the load-bearing block 43.

[0060] The load-bearing block 43 is sleeved with a slip ring 44 , and the load-bearing block 43 and the slip ring 44 are connected via a rolling bearing.

[0061] In order to enhance the stability of the bumper during transportation, in the present invention, when the bumper has not entered the paint inspection process, under the action of the weight of the bumper and the rack itself, the rack has a tendency to move downward along the support shaft 2 until the limit block 4 enters the limit groove 41 to support the rack. At this time, under the combined action of the limit block 4 and the limit groove 41, the rack and the support shaft 2 cannot produce relative rotation. After the bumper enters the paint inspection process, as the transportation continues, the swing shaft 21 gradually enters the gap of the lifting rail 42, causing the load-bearing block The slip ring 44 at the bottom of 43 is in contact with the lifting rail 42. The lifting rail 42 is a structure that is high in the middle and low at both ends. Therefore, as the hanger moves toward the middle of the lifting rail 42, the swing shaft 21 is gradually lifted, causing the swing shaft 21 and the hanger to move upward, thereby causing the limit block 4 to disengage from the limit groove 41, thereby allowing the hanger to rotate. It should be noted that the setting of connecting the slip ring 44 and the load-bearing block 43 through a rolling bearing is to effectively reduce the friction between the slip ring 44 and the load-bearing block 43, thereby facilitating the rotation of the swing shaft 21.

[0062] As a preferred embodiment of the present invention, a first resetting elastic member 5 and a second resetting elastic member 51 are fixedly mounted on the frame, and the first resetting elastic member 5 and the second resetting elastic member extend and are fixed on the support shaft 2 and the deflection shaft 24 respectively.

[0063] In the present invention, the first reset elastic member 5 and the second reset elastic member 51 are preferably a combination of one or more elastic ropes and springs. As the relative movement between the hanger and the lifting rail 42 proceeds, when the hanger moves from the middle of the lifting rail 42 to the other end, the hanger gradually descends. At this time, the existence of the first reset elastic member 5 and the second reset elastic member 51, on the one hand, can restore the bumper and the hanger to their initial states, and on the other hand, it is to facilitate the combination of the limit groove 41 and the limit block 4 again.

[0064] As a preferred embodiment of the present invention, the frame includes a top rod 31, a bottom rod 32 and a telescopic member, both ends of the telescopic member are respectively connected to the top rod 31 and the bottom rod 32, and the deflection shaft 24 is installed on the telescopic member.

[0065] The frame is composed of a top rod 31, a bottom rod 32 and a telescopic member. During transportation, when the lifting rail 42 lifts the swing shaft 21, the swing shaft 21 directly pulls the top rod 31 up, and then the telescopic member gradually unfolds. When the telescopic member is unfolded, the bottom rod 32 is pulled up, and finally the limit groove 41 is separated from the limit block 4. In this process, the unfolding of the telescopic member increases the spacing between the clamps 3 and the bumper that are evenly arranged in the vertical direction. Therefore, when the bumper is deflected in the vertical direction, it can effectively avoid collision between the bumpers. It should be noted that the transmission worm 26 used in the present invention is a telescopic structure. In this embodiment, the transmission worm 26 consists of a transmission section and a telescopic section, wherein the transmission sections are rotatably mounted on the telescopic member, and a telescopic section is fixedly mounted between two adjacent transmission sections. The telescopic section can both transmit torque and be telescopic in the vertical direction.

[0066] As a preferred embodiment of the present invention, the telescopic member is a combination of a cross-scissor bracket 33 and a mounting block 34 , and the deflection shaft 24 is mounted on the mounting block 34 .

[0067] The cross-scissor bracket 33 is used to fix the mounting block 34 on the bracket, so that during the extension and retraction process of the telescopic member, the spacing between the multiple mounting blocks 34 is always the same, and the spacing between the multiple bumpers in the vertical direction is always the same.

[0068] As a preferred embodiment of the present invention, the top rod 31 and the bottom rod 32 are both hingedly mounted with a yaw rod 6 , the yaw rod 6 is divided into two groups, and the telescopic member is hingedly connected to the two groups of yaw rods 6 .

[0069] The setting of the deflection rod 6 enables the deflection rod 6 to deflect under the action of gravity when the frame is extended or retracted in the vertical direction, thereby increasing the distance between the bumpers on both sides of the bracket during the detection process, further enhancing the convenience of changing the bumper angle.

[0070] As a preferred embodiment of the present invention, a telescopic rod 7 is fixedly installed on two adjacent mounting blocks 34. The setting of the telescopic rod 7, together with the cross-scissor-type bracket 33, enhances the limiting effect of the multiple mounting blocks 34, so that the multiple mounting blocks 34 can follow the cross-scissor-type bracket 33 to stably perform telescopic movement in the vertical direction.

[0071] like Fig. 9 As shown, a method for detecting bumper paint defects comprises the following steps:

[0072] S1: The bumper is installed on the rack and transported by the track conveyor 1 along a preset route. After the spraying and drying processes, it enters the paint defect detection process;

[0073] S2: As the track conveyor 1 continues to operate, the load-bearing block 43 on the swing shaft 21 gradually moves to the lifting rail 42 and contacts the lifting rail 42 through the slip ring 44 sleeved at the bottom. Under the guidance of the lifting rail 42, the swing shaft 21 pulls the top rod 31 to rise;

[0074] S3: During the rising process of the top rod 31, the deflection rod 6 is caused to deflect first and then rise, pushing the telescopic parts to expand in the vertical direction and move away from each other in the horizontal direction, thereby separating the multiple bumpers mounted thereon from each other;

[0075] S4: As the track conveyor 1 continues to operate, the first transmission wheel 22 and the second transmission wheel 27 successively contact the swing rack 23 and the deflection rack 28, and then under the transmission of the swing shaft 21, the transmission worm 26, the worm wheel 25 and the deflection shaft 24, the bumper swings in the horizontal direction and deflects in the vertical direction;

[0076] S5: During the swinging and deflecting process of the bumper, the machine vision detection module on the tunnel-type detection platform 11 continuously performs machine vision recognition on the bumper, thereby realizing dynamic detection of the bumper.

[0077] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A bumper paint defect detection device, comprising a track conveyor (1) and a tunnel detection platform (11); The track conveyor (1) is used to transport the bumper; The tunnel-type inspection platform (11) is located on an extension path of the track-type conveyor (1), and a machine vision inspection module is installed on a side of the tunnel-type inspection platform (11) facing the tunnel-type inspection platform (11), wherein the machine vision inspection module is used to automatically inspect paint defects on the bumper; Features: It also includes a follow-up mechanism, the bumper is mounted on the follow-up mechanism, and the follow-up mechanism is used to adjust the relative angle between the bumper and the tunnel-type testing platform (11); The follower mechanism comprises a support shaft (2), a hanger, a swing shaft (21) and a swing rack (23); The support shaft (2) is fixedly mounted on the track conveyor (1), the bracket is rotatably mounted on the support shaft (2), and the bumper is detachably fixedly mounted on the bracket; A swing shaft (21) is vertically mounted on the top of the rack, a first transmission wheel (22) is fixedly mounted on the swing shaft (21), a plurality of swing racks (23) are fixedly mounted inside the tunnel-type detection platform (11), and the swing racks (23) are located on both sides of the movement path of the first transmission wheel (22).

2. A bumper paint defect detection device according to claim 1, characterized in that: The follower mechanism also includes a deflection shaft (24), a worm wheel (25), a transmission worm (26) and a deflection rack (28); The rack comprises a frame body and a clamp (3); a horizontally arranged deflection shaft (24) is rotatably mounted on the frame body; the clamp (3) is fixedly mounted on the deflection shaft (24); and the bumper is detachably fixedly mounted on the clamp (3); A worm wheel (25) is fixedly mounted on the deflection shaft (24), a transmission worm (26) is rotatably mounted on the frame, the transmission worm (26) and the worm wheel (25) are meshingly connected, a second transmission wheel (27) is fixedly mounted on the transmission worm (26), and a plurality of deflection racks (28) are mounted in the tunnel-type detection platform (11), the deflection racks (28) are located on both sides of the movement path of the second transmission wheel (27).

3. A bumper paint defect detection device according to claim 2, characterized in that: A limit block (4) is fixedly mounted on the support shaft (2), a limit slot (41) is provided on the frame, and in an initial state, the limit block (4) is located in the limit slot (41), a lifting rail (42) is fixedly mounted on the tunnel-type detection platform (11), and the lifting rail (42) is an arc-shaped structure with a high middle and low ends, and a load-bearing block (43) is fixedly mounted on the top end of the swing shaft (21), and the ends of the lifting rail (42) are located on both sides of the movement path of the load-bearing block (43).

4. A bumper paint defect detection device according to claim 3, characterized in that: A slip ring (44) is sleeved on the load-bearing block (43), and the load-bearing block (43) and the slip ring (44) are connected via a rolling bearing.

5. The bumper paint defect detection device according to claim 4, characterized in that: A first resetting elastic member (5) and a second resetting elastic member (51) are fixedly mounted on the frame, and the first resetting elastic member (5) and the second resetting elastic member (51) extend and are fixed on the support shaft (2) and the deflection shaft (24) respectively.

6. A bumper paint defect detection device according to claim 5, characterized in that: The frame body comprises a top rod (31), a bottom rod (32) and a telescopic member, the two ends of the telescopic member are respectively connected to the top rod (31) and the bottom rod (32), and the deflection shaft (24) is mounted on the telescopic member.

7. A bumper paint defect detection device according to claim 6, characterized in that: The telescopic member is a combination of a cross-scissor type bracket (33) and a mounting block (34), and the deflection shaft (24) is mounted on the mounting block (34).

8. The bumper paint defect detection device according to claim 7, characterized in that: The top rod (31) and the bottom rod (32) are both hingedly mounted with deflection rods (6), the deflection rods (6) are divided into two groups, and the telescopic parts are hingedly connected to the two groups of deflection rods (6).

9. The bumper paint defect detection device according to claim 8, characterized in that: A telescopic rod (7) is fixedly mounted on two adjacent mounting blocks (34).

10. A method for detecting bumper paint defects, characterized in that: The method uses a bumper paint defect detection device as described in claim 9, and the detection method comprises the following steps: S1: The bumper is mounted on a rack and transported by a track conveyor (1) along a pre-set route, and after undergoing spraying and drying steps, enters a paint surface defect detection step; S2: As the track conveyor (1) continues to operate, the load-bearing block (43) on the swing shaft (21) gradually moves onto the lifting rail (42) and contacts the lifting rail (42) through the slip ring (44) sleeved at the bottom. Under the guidance of the lifting rail (42), the swing shaft (21) pulls the top rod (31) upward; S3: During the process of the top rod (31) rising, the deflection rod (6) is caused to deflect first and then rise, pushing the telescopic parts to expand in the vertical direction and move away from each other in the horizontal direction, thereby separating the multiple bumpers mounted thereon from each other; S4: As the track conveyor (1) continues to operate, the first transmission wheel (22) and the second transmission wheel (27) successively contact the swing rack (23) and the deflection rack (28), and then, under the drive of the swing shaft (21), the transmission worm (26), the worm wheel (25) and the deflection shaft (24), the bumper swings in the horizontal direction and deflects in the vertical direction; S5: During the swinging and deflecting process of the bumper, the machine vision detection module on the tunnel-type detection platform (11) continuously performs machine vision recognition on the bumper, thereby realizing dynamic detection of the bumper.

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