Dual-station automatic license plate detection and rejection mechanism

Abstract

This application discloses a dual-station automatic license plate detection and rejection mechanism, relating to the field of license plate production technology. Its key technical features include: a machine frame with a first conveyor belt and a second conveyor belt arranged sequentially along its length; an automatic license plate detection device is installed above each of the first conveyor belts to inspect the appearance quality of the license plates on the first conveyor belt; and a defective product rejection mechanism is installed above each of the second conveyor belts to automatically reject unqualified license plates detected by the automatic detection device. The automatic license plate detection device and defective product rejection mechanism of this application can replace manual labor for efficient automatic detection and rejection of manufactured license plates, effectively improving inspection efficiency and quality while reducing production costs for enterprises.

Description

Technical Field

[0001] This application relates to the field of license plate production technology, and in particular to a dual-station automatic license plate detection and rejection mechanism. Background Technology

[0002] License plates are vehicle identifiers and an important tool for traffic management. With the continuous increase in the number of vehicles, the production of license plates is also increasing daily. The normal production of license plates involves at least four stages: the dedicated equipment registration and networking stage, the material preparation stage, the production stage, and the quality inspection stage. Only license plates that pass the final quality inspection are packaged and shipped to the customer.

[0003] Currently, many companies still rely on manual screening for license plate quality verification. Several workers stand on either side of a conveyor belt, using their experience to judge whether there are defects on the surface of the finished license plates. Once a problematic license plate is found, it is manually removed from the conveyor belt. This ensures that only qualified license plates are output at the end of the conveyor belt. This method relies heavily on manpower for quality control, which requires a large workforce for large-scale license plate production lines. In the long run, this undoubtedly increases production costs for companies. Furthermore, workers' frequent staring at single-color license plates can easily lead to visual fatigue and eye discomfort, which not only affects their health but may also negatively impact the quality of subsequent work. Utility Model Content

[0004] This application provides a dual-station automatic license plate detection and rejection mechanism, which can replace manual labor to perform efficient automatic detection and defective product rejection of manufactured license plates.

[0005] The above-mentioned objective of this application is achieved through the following technical solution:

[0006] A dual-station automatic license plate detection and rejection mechanism includes a movable equipment frame. Two first conveyor belts and two second conveyor belts are arranged side by side along the length of the equipment frame, and the positions of the two first conveyor belts and the two second conveyor belts correspond one-to-one along the width of the equipment frame.

[0007] Each of the first conveyor belts is equipped with an automatic license plate detection device, which is used to detect the appearance quality of the license plates on the first conveyor belt.

[0008] Each of the second conveyor belts is equipped with a defective product rejection mechanism. The defective product rejection mechanism and the automatic license plate detection device are connected to the same control center. The defective product rejection mechanism is used to automatically reject unqualified license plates detected by the automatic license plate detection device on the second conveyor belt.

[0009] Furthermore, the automatic license plate detection device includes four vertical guide rods, the lower ends of the four vertical guide rods are respectively fixedly connected to the equipment frame through a guide shaft support, and the four vertical guide rods are respectively located at the four corners of the two first conveyor belts on the sides away from each other;

[0010] Two transverse guide rods are installed vertically between adjacent vertical guide rods via cross support seats. Light source fixing plates are fixedly installed on the four transverse guide rods located on the lower side by bolts. A first detection light source is installed on each side of the light source fixing plate that is close to each other.

[0011] A central beam is fixedly connected between two of the four transverse guide rods located on the upper side along the conveying direction of the first conveyor belt. Two camera mounting plates are fixedly installed in the middle of the central beam. A detection camera is provided on the upper side of each end of the camera mounting plate, and each detection camera is fixedly installed on the camera mounting plate at the corresponding position through a camera mounting seat.

[0012] Furthermore, on the two transverse guide rods located on the upper side of the four vertical guide rods that do not have the central beam installed, a second detection light source is respectively installed on a light source fixing plate.

[0013] Furthermore, the light color of the first detection light source is red, and the light color of the second detection light source is blue.

[0014] Furthermore, a support plate is provided below the upper side of the two first conveyor belts. The two ends of the support plate along the width direction of the equipment frame are fixedly connected to the equipment frame. A black background cloth is pasted on the support plate.

[0015] Furthermore, the defective product rejection mechanism includes two gantry-shaped supports arranged side by side along the conveying direction of the second conveyor belt. The gantry-shaped supports are fixedly connected to the equipment frame. A fixed side rod is fixedly connected between the two sides of the upper end of the gantry-shaped supports. Two horizontal moving units are installed between the two fixed side rods at positions corresponding to the two second conveyor belts. A vacuum suction cup robot is installed on the moving part of each of the two horizontal moving units. A defective product collection box is fixedly installed on the equipment frame at positions corresponding to the two vacuum suction cup robots along the length direction of the equipment frame.

[0016] Furthermore, the horizontal moving unit includes a third conveyor belt. A power motor connected to a pulley at one end of the third conveyor belt is mounted at the middle position of the upper ends of the two portal brackets via a first bracket. The pulley at the other end of the third conveyor belt is mounted above a fixed side rod on the adjacent side via a second bracket. The projection of the third conveyor belt body on the horizontal plane falls into the defective product collection box on the corresponding side. The mounting frame of the vacuum suction cup robot is fixedly connected to the belt body on the lower side of the third conveyor belt.

[0017] Furthermore, the two ends of the vacuum suction cup manipulator mounting bracket are respectively fitted onto a guide rail, and the two ends of the guide rail are respectively fixedly connected to the fixed side rod and the first bracket on the adjacent side.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] After the manufactured license plates are conveyed to the first conveyor belt, they pass one by one through an automatic license plate inspection device. This device automatically analyzes and judges the appearance of the license plates and sends the relevant information to the defective product rejection mechanism via a control center. If all license plates on the first conveyor belt are qualified, the defective product rejection mechanism does not need to operate, and the license plates continue to be conveyed to the next process via a second conveyor belt. If some license plates on the first conveyor belt are unqualified, the defective product rejection mechanism will activate upon receiving the corresponding signal, quickly rejecting the defective license plates received on the second conveyor belt from the first conveyor belt, ensuring that all license plates output from the second conveyor belt are qualified products. Compared to existing manual inspection methods for license plate quality, this application utilizes machines for both the inspection operation and the rejection of defective products. This not only effectively improves inspection efficiency but also avoids the discomfort caused by workers staring at a single color for extended periods, thus ensuring the stability of inspection quality. Furthermore, in the long run, it reduces the company's production costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram observed from the side of the automatic license plate detection device in this application;

[0022] Figure 2This is a three-dimensional structural diagram observed from the perspective of the defective product rejection mechanism in this application.

[0023] Figure 3 This is a side view of a portion of the automatic license plate detection device of this application;

[0024] Figure 4 yes Figure 2 A schematic diagram of the defective product rejection mechanism.

[0025] Reference numerals: 1. Equipment frame; 2. First conveyor belt; 3. Second conveyor belt; 4. Automatic license plate detection device; 41. Vertical guide rod; 42. Guide shaft support; 43. Cross support seat; 44. Horizontal guide rod; 45. Light source fixing plate; 46. First detection light source; 47. Central beam; 48. Camera fixing plate; 49. Detection camera; 410. Camera fixing seat; 5. Defective product rejection mechanism; 51. Portal bracket; 52. Fixed side rod; 53. Horizontal moving unit; 531. Third conveyor belt; 532. First bracket; 533. Second bracket; 54. Vacuum suction cup robot; 55. Defective product collection box; 6. Second detection light source; 7. Support plate; 8. Guide rail. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0027] like Figure 1 and Figure 2 As shown, this application discloses a dual-station automatic detection and rejection mechanism for license plates, which includes a movable equipment frame 1. Two first conveyor belts 2 and two second conveyor belts 3 are arranged side by side along the length of the equipment frame 1, and the positions of the two first conveyor belts 2 and the two second conveyor belts 3 correspond one-to-one along the width of the equipment frame 1.

[0028] Each of the first conveyor belts 2 is equipped with an automatic license plate detection device 4, which is used to detect the appearance quality of the license plates on the first conveyor belt 2.

[0029] Above each of the second conveyor belts 3 is a defective product rejection mechanism 5. The defective product rejection mechanism 5 and the automatic license plate detection device 4 are connected to the same control center. The defective product rejection mechanism 5 is used to automatically reject the unqualified license plates detected by the automatic license plate detection device 4 on the second conveyor belt 3.

[0030] In the above embodiments, this application provides two first conveyor belts 2 and two second conveyor belts 3 along the length of the equipment frame 1. The feeding end of the first conveyor belt 2 faces the conveyor belt of the license plate production process, so that the license plates produced in the license plate production process will be smoothly transferred to the two first conveyor belts 2. The discharging ends of the two first conveyor belts 2 are respectively facing the feeding ends of the two second conveyor belts 3. After the license plates have completed the inspection on the first conveyor belt 2, they can be smoothly transferred to the second conveyor belt 3. The discharging end of the second conveyor belt 3 is connected to the packaging area through another conveyor belt so that the qualified license plates can be further packaged.

[0031] This application includes an automatic license plate detection device 4 above the first conveyor belt 2 and a defective product rejection mechanism 5 above the second conveyor belt 3. The automatic license plate detection device 4 automatically detects the appearance quality of the license plates as they pass beneath it, thus identifying qualified and unqualified license plates. After passing the first conveyor belt 2, the license plates move onto the second conveyor belt 3 and continue moving along it. When they pass the defective product rejection mechanism 5 on the second conveyor belt 3, the mechanism, based on feedback from the automatic license plate detection device 4, takes timely action to reject unqualified license plates, ensuring that all license plates discharged from the second conveyor belt 3 are of qualified appearance quality. Compared to traditional manual inspection of license plate appearance quality, this application utilizes machines for both the detection and rejection of defective products. This not only effectively improves detection efficiency but also reduces human intervention, avoiding discomfort caused by prolonged exposure to a single color, thus ensuring the stability of inspection quality. Furthermore, in the long run, it reduces production costs for enterprises. Furthermore, the first conveyor belt 2 and the second conveyor belt 3 of this application are both two, so that two parallel and independent dual-station quality inspection lines can be formed during production. Compared with the single-station quality inspection line, the dual-station automatic detection and rejection mechanism of this application is significantly more efficient.

[0032] Furthermore, such as Figures 1-3 As shown, the automatic license plate detection device 4 includes four vertical guide rods 41. The lower ends of the four vertical guide rods 41 are fixedly connected to the equipment frame 1 through a guide shaft support 42, and the four vertical guide rods 41 are located at the four corners of the two first conveyor belts 2 on the sides away from each other.

[0033] Two transverse guide rods 44 are installed vertically between adjacent vertical guide rods 41 via cross support seats 43. Light source fixing plates 45 are fixedly installed on the four transverse guide rods 44 located on the lower side by bolts. A first detection light source 46 is installed on each side of the light source fixing plates 45 that are close to each other.

[0034] A central beam 47 is fixedly connected between two of the four transverse guide rods 44 located on the upper side along the conveying direction of the first conveyor belt 2. Two camera mounting plates 48 are fixedly installed in the middle of the central beam 47. A detection camera 49 is provided on the upper side of both ends of the camera mounting plate 48, and each detection camera 49 is fixedly installed on the camera mounting plate 48 at the corresponding position through a camera mounting seat 410.

[0035] In the above embodiments, the vertical guide rod 41 and the horizontal guide rod 44 of this application are arranged in the manner described above to form a frame structure above the two first conveyor belts 2. The main function of this structure is to provide an installation base for components such as the first detection light source 46 and the detection camera 49. The vertical guide rod 41 of this application is provided with two layers of horizontal guide rods 44. Each layer of horizontal guide rods 44 consists of four independent horizontal guide rods 44. The four horizontal guide rods in the lower layer of this application are each equipped with a first detection light source 46 through a light source fixing plate 45. The first detection light source 46 has a certain tilt angle, which is generally 45 degrees, to ensure that the light emitted by the first detection light source 46 can smoothly hit the first conveyor belt 2. A central beam 47 is fixedly installed between two opposite sides of the four horizontal guide rods 44 located on the upper layer. Two parallel camera mounting plates 48 are fixedly installed in the middle of the central beam 47. The inspection camera 49 can be suspended directly above the two first conveyor belts 2 through the camera mounting plates 48. When the license plate moves along the first conveyor belt 2 to the second conveyor belt 3, the first inspection light source 46 illuminates the surface of the license plate. With the cooperation of the inspection camera 49, the license plate can be quickly photographed and sampled. The acquired image data is transmitted to the control center. The processing unit in the control center analyzes the license plate image data captured by the inspection camera 49 to determine whether its appearance is qualified. This part of the software system can be implemented based on the existing CCD visual inspection technology (this technology uses a CCD camera to collect image data at the front end, analyzes and compares it through the back end deep learning algorithm, and performs the next operation according to the "NG" or "OK" instruction given by the system). The first detection light source 46 of this application is arranged in a circle above the two first conveyor belts 2, which ensures that all license plates passing through the first conveyor belts 2 can be illuminated. The four detection cameras 49 are located directly above the middle position of the four first detection light sources 46. When the first detection light source 46 shines light on the license plate, and there is a sharp contrast between the color of the license plate surface and the first detection light source 46, the detection camera 49 can take a picture of the license plate in this state and transmit its impact data to the control center, so that it can analyze and judge the appearance information such as the color and coating quality of the license plate surface.

[0036] Furthermore, such as Figures 1-3As shown, among the four vertical guide rods 41, the two other horizontal guide rods 44 located on the upper side without the central beam 47 are each equipped with a second detection light source 6 via a light source fixing plate 45.

[0037] In the above embodiments, this application adds a second detection light source 6 to the two other transverse guide rods 44 located on the upper side (or upper layer) of the four vertical guide rods 41 that do not have a central beam 47 installed, in order to improve the development effect of defects on the appearance of the license plate when the detection camera 49 takes pictures.

[0038] Furthermore, the light from the first detection light source 46 is red, and the light from the second detection light source 6 is blue.

[0039] In the above embodiments, the background color and characters of license plates often use complementary colors, such as the blue background and white characters commonly seen on roads. If ordinary natural light is used to illuminate the license plate directly, the presence of broad-spectrum light can easily cause overexposure or blurring of the image when the detection camera 49 takes a picture. However, the first detection light source 46 of this application emits red light. When the red light shines on the blue background of the license plate, it will appear darker due to the absorption of red light, while the white characters on the license plate will appear brighter due to the reflection of red light. This creates high contrast, which helps to determine the printing quality of the surface color of the license plate. The second detection light source 6 added above the first detection light source 46 emits blue light. Because of its high energy, blue light can enhance the brightness and detail sharpness of the license plate background color when it hits the license plate, thereby highlighting the surface structure of the license plate. This helps the detection camera 49 to obtain more details of the license plate surface, thus enabling a more accurate evaluation of the appearance quality of the license plate.

[0040] Furthermore, such as Figure 2 and Figure 3 As shown, a support plate 7 is provided below the upper side of the two first conveyor belts 2. The two ends of the support plate 7 along the width direction of the equipment frame 1 are fixedly connected to the equipment frame 1. A black background cloth is pasted on the support plate 7.

[0041] In the above embodiments, the black background cloth is located below the license plate on the first conveyor belt 2. It serves a similar purpose to the background cloth used by the detection camera 49 when taking pictures of the license plate as it does when taking portrait photos. It can not only eliminate some irrelevant factors in the process, such as preventing the detection camera 49 from capturing some structures unrelated to the quality of the license plate and interfering with the analysis and judgment of the control equipment, but also absorb stray light, making the outline of the license plate clearer and sharper.

[0042] Furthermore, such as Figure 1 , Figure 2 and Figure 4As shown, the defective product rejection mechanism 5 includes two gantry-shaped supports 51 arranged side by side along the conveying direction of the second conveyor belt 3. The gantry-shaped supports 51 are fixedly connected to the equipment frame 1. A fixed side rod 52 is fixedly connected between the two sides of the upper end of the gantry-shaped supports 51. Two horizontal moving units 53 are installed between the two fixed side rods 52 at positions corresponding to the two second conveyor belts 3. A vacuum suction cup robot 54 is installed on the moving part of each of the two horizontal moving units 53. A defective product collection box 55 is fixedly installed at the positions corresponding to the two vacuum suction cup robots 54 along the length direction of the equipment frame 1.

[0043] In the above embodiments, the two portal brackets 51 and the fixed side rods 52 of this application cooperate to form a skeleton structure above the second conveyor belt 3, so as to install components such as vacuum suction cup robots 54 above the second conveyor belt 3. In actual production, structural components can be added to the corresponding positions on the portal brackets 51 according to the specific product models and specifications used by the user, and this application does not make any special limitations in this regard. The portal brackets 51 of this application are provided with two horizontal moving units 53 in the middle. Each of the moving parts of the horizontal moving unit 53 is equipped with a vacuum suction cup robot 54 (the vacuum suction cup robot 54 is an automated gripping device based on the principle of negative pressure adsorption, which is now widely used in the field of industrial automation). The horizontal moving unit 53 and the vacuum suction cup robot 54 of this application are connected to the control center, just like the detection camera 49. In this way, the instructions obtained by the control center based on the license plate photos taken by the detection camera 49 can be smoothly sent to the horizontal moving unit 53 and the vacuum suction cup robot 54 to determine whether they need to remove the license plates on the second conveyor belt 3. Because the proportion of defective products in the production process is relatively small, this application only sets one defective product collection box 55 on each side of the equipment frame 1 to collect defective products removed by the vacuum suction cup robot arm 54. By setting the defective product rejection mechanism 5 with the above structure above the two second conveyor belts 3, the rejection of defective products on the second conveyor belts 3 can be completed efficiently and accurately according to the instructions issued by the control center.

[0044] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the horizontal moving unit 53 includes a third conveyor belt 531. The power motor connected to the pulley at one end of the third conveyor belt 531 is mounted in the middle position of the upper end of two portal brackets 51 via a first bracket 532. The pulley at the other end of the third conveyor belt 531 is mounted above a fixed side rod 52 on the adjacent side via a second bracket 533. The projection of the third conveyor belt 531 on the horizontal plane falls into the defective product collection box 55 on the corresponding side. The mounting frame of the vacuum suction cup robot 54 is fixedly connected to the belt body on the lower side of the third conveyor belt 531.

[0045] In the above embodiments, the portion of the third conveyor belt 531 connected to the output end of the power motor, and the portion of the third conveyor belt 531 located at the second bracket 533, are each equipped with a freely rotatable pulley. After the power motor starts, it can drive the third conveyor belt 531 to rotate, and its principle is the same as that of a traditional conveyor belt. In this application, the mounting frame of the vacuum suction cup robot 54 is fixedly connected to the belt body on the lower side of the third conveyor belt 531. Thus, during the movement of the third conveyor belt 531, the vacuum suction cup robot 54 can achieve a change in its horizontal position, allowing it to smoothly reach above the defective product collection box 55 after picking up defective products, so that the defective products can be released into the defective product collection box 55.

[0046] Furthermore, such as Figure 1 and Figure 2 As shown, the two ends of the vacuum suction cup robot arm 54 mounting bracket are respectively fitted onto a guide rail 8, and the two ends of the guide rail 8 are respectively fixedly connected to the adjacent fixed side rod 52 and the first bracket 532.

[0047] In the above embodiments, since the suspended part of the third conveyor belt 531 lacks support, the vacuum suction cup robot 54 may sway as the third conveyor belt 531 moves horizontally. Therefore, this application adds two guide rails 8 to guide the vacuum suction cup robot 54 during its horizontal movement, thereby reducing the risk of swaying.

[0048] The implementation principle of this embodiment is as follows: After the manufactured license plates are conveyed to the first conveyor belt 2, the first conveyor belt 2 will carry these license plates one by one through the inspection camera 49. The inspection camera 49 will automatically take pictures of the license plates and transmit the relevant image information to the control center. The control center will analyze and judge the license plate images and send the judgment results to the defective product rejection mechanism 5. If all the license plates on the first conveyor belt 2 are qualified, the defective product rejection mechanism 5 does not need to take any action. These license plates will continue to be conveyed to the next process through the second conveyor belt 3. If some license plates on the first conveyor belt 2 are unqualified, the defective product rejection mechanism 5 will start after obtaining the corresponding signal. The third conveyor belt 531, together with the vacuum suction cup robot arm 54, will quickly pick up the defective license plates received on the second conveyor belt 3 from the license plates on the first conveyor belt 2 and put them into the defective product collection box 55, thereby ensuring that the license plates finally output by the second conveyor belt 3 are all qualified products. Compared to the existing manual inspection of license plate quality, this application uses machines to complete both the inspection operation and the rejection of defective products. This not only effectively improves the efficiency of inspection, but also avoids the discomfort caused by workers staring at a single color for a long time due to the reduction of manual labor. Correspondingly, it also ensures the stability of inspection quality. In the long run, it also reduces the production costs of enterprises.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-station automatic license plate detection and rejection mechanism, comprising a movable equipment frame (1), characterized in that: The equipment frame (1) is provided with two first conveyor belts (2) and two second conveyor belts (3) arranged side by side along its length direction, and the positions of the two first conveyor belts (2) and the two second conveyor belts (3) are in one-to-one correspondence along the width direction of the equipment frame (1); Each of the first conveyor belts (2) is equipped with an automatic license plate detection device (4), which is used to detect the appearance quality of the license plates on the first conveyor belt (2). Each of the second conveyor belts is equipped with a defective product rejection mechanism (5), and the defective product rejection mechanism (5) and the license plate automatic detection device (4) are connected to the same control center; the defective product rejection mechanism (5) is used to automatically perform rejection operation on the unqualified license plates detected by the license plate automatic detection device (4) on the second conveyor belt (3); The automatic license plate detection device (4) includes four vertical guide rods (41). The lower ends of the four vertical guide rods (41) are fixedly connected to the equipment frame (1) through a guide shaft support (42) and the four vertical guide rods (41) are located at the four corners of the two first conveyor belts (2) on the sides away from each other. Two transverse guide rods (44) are installed vertically between adjacent vertical guide rods (41) via cross support seats (43). Light source fixing plates (45) are fixedly installed on the four transverse guide rods (44) located on the lower side by bolts. A first detection light source (46) is installed on each side of the light source fixing plates (45) that are close to each other. A central beam (47) is fixedly connected between two of the four transverse guide rods (44) located on the upper side along the conveying direction of the first conveyor belt (2). Two camera mounting plates (48) are fixedly installed in the middle of the central beam (47). A detection camera (49) is provided on the upper side of both ends of the camera mounting plate (48), and each detection camera (49) is fixedly installed on the camera mounting plate (48) at the corresponding position through a camera mounting seat (410).

2. The dual-station automatic license plate detection and rejection mechanism according to claim 1, characterized in that: Two of the four vertical guide rods (41) without the central beam (47) are respectively equipped with a second detection light source (6) via a light source fixing plate (45).

3. The dual-station automatic license plate detection and rejection mechanism according to claim 2, characterized in that: The light color of the first detection light source (46) is red, and the light color of the second detection light source (6) is blue.

4. The dual-station automatic license plate detection and rejection mechanism according to any one of claims 1 to 3, characterized in that: Support plates (7) are provided below the upper belts of the two first conveyor belts (2). The support plates (7) are fixedly connected to the equipment frame (1) at both ends along the width direction of the equipment frame (1). A black background cloth is pasted on the support plates (7).

5. The dual-station automatic license plate detection and rejection mechanism according to claim 1, characterized in that: The defective product rejection mechanism (5) includes two gantry brackets (51) arranged side by side along the conveying direction of the second conveyor belt (3). The gantry brackets (51) are fixedly connected to the equipment frame (1). A fixed side rod (52) is fixedly connected between the two sides of the upper end of the gantry brackets (51). Two horizontal moving units (53) are installed between the two fixed side rods (52) at positions corresponding to the two second conveyor belts (3). A vacuum suction cup robot (54) is installed on the moving part of each of the two horizontal moving units (53). A defective product collection box (55) is fixedly installed on the equipment frame (1) at positions corresponding to the two vacuum suction cup robots (54) along the length direction of the equipment frame (1).

6. The dual-station automatic license plate detection and rejection mechanism according to claim 5, characterized in that: The horizontal moving unit (53) includes a third conveyor belt (531). The power motor connected to the pulley at one end of the third conveyor belt (531) is mounted at the middle position of the upper end of the two portal brackets (51) via a first bracket (532). The pulley at the other end of the third conveyor belt (531) is mounted above a fixed side rod (52) on the adjacent side via a second bracket (533). The projection of the third conveyor belt (531) on the horizontal plane falls into the defective product collection box (55) on the corresponding side. The mounting frame of the vacuum suction cup robot (54) is fixedly connected to the belt body on the lower side of the third conveyor belt (531).

7. The dual-station automatic license plate detection and rejection mechanism according to claim 6, characterized in that: The two ends of the vacuum suction cup manipulator (54) mounting frame are respectively fitted onto a guide rail (8), and the two ends of the guide rail (8) are respectively fixedly connected to the fixed side rod (52) and the first bracket (532) on the adjacent side.

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