License Plate Endorsement System

Abstract

The present invention provides a license plate endorsement system, which includes a track for transporting license plates; a first endorsement device disposed at a first position of the track, which uses a laser to endorse first identification information on the license plates transported to the first position by the track; a second endorsement device disposed at a second position of the track, which uses a laser to endorse second identification information on the license plates transported to the second position by the track; and a first diversion device disposed on the track and in front of the first endorsement device and the second endorsement device. The first diversion device divides the track into a first track and a second track. When the first endorsement device and / or the second endorsement device is in a working state and there are still license plates being transported from the track to the first endorsement device and / or the second endorsement device, the first diversion device is controlled to divert the track before the first diversion into a turnover box. Otherwise, the first diversion device is controlled to connect the first track and the second track. The present invention improves the endorsement speed.

Description

Technical Field

[0001] The present invention belongs to a license plate endorsement system, and more particularly relates to a license plate endorsement system for motor vehicle license plate sequence identification. Background Art

[0002] A motor vehicle license plate is a legal sign registered with the traffic management department of the public security organ and is permitted for a motor vehicle to drive on the roads within the People's Republic of China. Endorsing information on the motor vehicle license plate is conducive to the management of the motor vehicle license plate. Some license plate endorsement systems cannot be completed in one go through an optical system due to a large endorsement area, and can only be endorsed in multiple times through a mobile endorsement platform. Moreover, there is only one work station, and the working sequence at one work station is successively: an automatic endorsement module endorses a two-dimensional code, endorses special characters, endorses a serial number, and a two-dimensional code recognition module performs recognition and inspection. The endorsement speed is relatively low, resulting in low production efficiency and inability to adapt to assembly line operation; in addition, the existing license plate endorsement system cannot identify reflective films from non-designated manufacturers, leading to chaos in the production management of motor vehicle license plate endorsement. Summary of the Invention

[0003] The object of the present invention is to provide a license plate endorsement system and an endorsement method with higher endorsement efficiency.

[0004] According to one aspect of the present invention, there is provided a license plate endorsement system, including:

[0005] A track for conveying license plates,

[0006] A first endorsement device disposed at a first position on the track, which uses a laser to endorse first identification information on a license plate conveyed to the first position by the track;

[0007] A second endorsement device disposed at a second position on the track, which uses a laser to endorse second identification information on a license plate conveyed to the second position by the track.

[0008] In some embodiments, it further includes a first diversion device disposed on the track and before the first endorsement device and the second endorsement device. The first diversion device divides the track into a first track and a second track. The first track is connected to a turnover box or the second track through the first diversion device.

[0009] A control system, when the first endorsement device is in a working state and there are still license plates being conveyed from the track to the first endorsement device, controls the first diversion device to introduce the first track into the turnover box; otherwise, controls the first diversion device to connect the first track to the second track.

[0010] In some embodiments, a license plate information acquisition device is further provided on the track. The license plate information acquisition device is located before the first endorsement device and the second endorsement device and after the first diversion device.

[0011] The license plate information acquisition device is used to acquire the license plate information conveyed from the track to the first endorsement device and upload it to the control system.

[0012] In some embodiments, the control system determines whether the license plate conveyed from the track to the first endorsement device can be endorsed based on the acquired license plate information. If it can, the control system controls the first endorsement device and the second endorsement device to perform endorsement. If not, the control system controls the first endorsement device and the second endorsement device not to perform endorsement.

[0013] In some embodiments, the license plate information acquisition device includes a first CCD camera, a first lens, and a first light source.

[0014] A first bracket is provided on the track. The first CCD camera and the first light source are provided on the first bracket. The first CCD camera is provided with a first lens. The first light source is located between the first lens and the license plate.

[0015] The first light source provides light for the first CCD camera to photograph the license plate. The first CCD camera photographs the logo on the reflective film surface of the license plate through the first lens and uploads it to the control system. The control system will determine whether it matches the logo of the reflective film of the manufacturer that needs to be endorsed.

[0016] In some embodiments, the first endorsement device includes a first fiber laser for providing a laser beam for license plate endorsement, a first galvanometer and field lens assembly for forming the first identification information, a diffuser for changing the angle of the laser beam, a one-dimensional moving platform, and an imaging lens.

[0017] A first support pillar is provided on the track. The first galvanometer and field lens assembly is arranged on the upper part of the first support pillar through a bracket. The rear end of the first galvanometer and field lens assembly is connected to a first fiber laser. A diffuser and an imaging lens are sequentially arranged below the first galvanometer and field lens assembly. The diffuser is arranged as a single piece or multiple pieces. The diffuser is installed on the one-dimensional moving platform. The one-dimensional moving platform adjusts the displacement of the diffuser in the vertical direction. The diffuser is located at the focal plane of the first galvanometer and field lens assembly. The reflective film of the license plate is located at the image plane of the imaging lens.

[0018] The laser beam coming out of the first fiber laser first scans a graphic trajectory through the first galvanometer and field lens assembly, then passes through the diffuser to increase the divergence angle and is converged by the imaging lens, and the first identification information is endorsed on the license plate through the imaging lens.

[0019] In some embodiments, two diffusion sheets are provided, and the two diffusion sheets are arranged in a staggered high-low manner.

[0020] In some embodiments, the diffusion sheet is an optical device with a diffusion effect, and is selected from but not limited to any one of frosted optical glass, grating, microlens array or cylindrical lens array.

[0021] In some embodiments, the second endorsement device includes a second fiber laser for providing a laser beam for number plate endorsement, a second galvanometer for forming second identification information, and a field lens assembly.

[0022] A second support column is provided on the track, and the second galvanometer and the field lens assembly are arranged on the upper part of the second support column through a bracket, and the second fiber laser is connected to the rear end of the second galvanometer and the field lens assembly.

[0023] The laser beam emitted from the second fiber laser is scanned by the second galvanometer and the field lens assembly to endorse the second identification information on the number plate along a graphic trajectory.

[0024] In some embodiments, the first identification information includes special symbols; the second identification information includes a two-dimensional code and a serial number.

[0025] In some embodiments, it further includes:

[0026] A second shunt device is provided on the track and is located behind the first endorsement device and the second endorsement device. The second shunt device divides the track into a second track and a third track. A waste bin is provided below the third track, and the second track is connected to the third track or the waste bin through the second shunt device.

[0027] In some embodiments, it further includes an endorsement identification acquisition device, which acquires the second identification information endorsed on the number plate with the first identification information and the second identification information. The endorsement identification acquisition device is arranged on the track and is located before the second shunt device;

[0028] The control system determines whether the second identification information of the endorsement acquired by the endorsement identification acquisition device is correct. If it is correct, it controls the second shunt device to import the number plate with the correct second identification information into the third track. If it is incorrect, it controls the second shunt device to import the number plate with the incorrect second identification information into the waste bin.

[0029] In some embodiments, the endorsement identification acquisition device includes a second CCD camera, a second lens and a second light source.

[0030] A second support is provided on the track. A second CCD camera and a second light source are provided on the second support. The second CCD camera is provided with a second lens. The second light source is located between the second lens and the license plate.

[0031] The second light source provides light for the second CCD camera to photograph the license plate. The second CCD camera photographs the two-dimensional code on the endorsement license plate via the second lens and uploads it to the control system. The control system determines whether the two-dimensional code is correct.

[0032] In some embodiments, the first shunting device includes two parallel long rods and a push-pull cylinder. A plurality of transmission wheel sets for conveying license plates are provided on the inner sides of the two long rods facing each other. One ends of the two long rods are respectively rotatably connected to the end of the first track. The other ends of the two long rods are not connected to the second track. A cross bar is provided between the ends of the two long rods. The cylinder body of the push-pull cylinder is arranged below the track. The piston rod of the push-pull cylinder is connected to the cross bar.

[0033] Its beneficial effects are as follows:

[0034] 1: The license plate endorsement system of the present invention is provided with a license plate information acquisition device to identify the markings and colors of the reflective film attached to the license plate, and perform the next process on the license plate with a matching manufacturer's reflective film, excluding license plates using reflective films of other manufacturers, which is beneficial to the standardized management of license plates.

[0035] 2: The license plate endorsement system of the present invention includes two endorsement stations, including a first endorsement device and a second endorsement device. The first endorsement device endorses special characters, and the second endorsement device endorses two-dimensional codes and serial numbers. The endorsement of special characters and the endorsement of two-dimensional codes and serial numbers are separately set to achieve independent transmission of two stations, which can effectively save transmission time and greatly improve the endorsement speed.

[0036] 3: The first endorsement device of the present invention endorses special characters and performs fixed endorsement on special characters. The second endorsement device endorses two-dimensional codes and serial numbers. The two-dimensional codes and serial numbers are in real-time connection with the license plate management system of the vehicle management office, further improving the endorsement speed, and at the same time ensuring the uniqueness and traceability of the license plate.

[0037] 4: The present invention adopts two-dimensional code and serial number endorsement, which improves the endorsement effect. At the same time, immediately after the endorsement is completed, the two-dimensional code is identified by the endorsement mark acquisition device. The operation is simple, and the static detection improves the recognition efficiency to basically reach 100%.

[0038] 5: The present invention optimizes the structure of the license plate endorsement system. The first diversion device and the turnover box added at the front end of the license plate endorsement system have the function of storing the surplus license plate materials. When there is a surplus of license plates due to mismatched equipment speeds, they automatically flow into the turnover box for subsequent manual use. The second diversion device and the waste box added at the discharging section have the function of storing defective products. Once a defective product occurs, the equipment does not need to stop, enabling continuous production of the equipment and being suitable for assembly line operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a license plate endorsement system according to an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of the diversion device of a license plate endorsement system according to an embodiment of the present invention;

[0041] Figure 3 is a schematic structural diagram of the endorsement device of a license plate endorsement system according to an embodiment of the present invention;

[0042] Figure 4 is a schematic structural diagram of the first endorsement device of a license plate endorsement system according to an embodiment of the present invention;

[0043] Figure 5 is a schematic structural diagram of the second endorsement device of a license plate endorsement system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] Figures 1 - 5 Schematically shows a license plate endorsement system according to an embodiment of the present invention. The license plate endorsement system is used to identify and endorse license plate 7. When the license plate 7 is not endorsed by the license plate endorsement system, it consists of a body and a reflective film attached to the body. After being endorsed by the license plate endorsement system, a two-dimensional code, special characters, and a serial number are endorsed on the body. Preferably, the two-dimensional code, special characters, and serial number are located in the upper left corner of the license plate 7. As Figures 1 - 5 shown, the license plate endorsement system includes a control system, a track, and a license plate information acquisition device 3, a first endorsement device 4, a second endorsement device 5, and an endorsement mark acquisition device 6 sequentially arranged on the track. The first endorsement device 4 endorses the first identification information on the license plate by laser. The first identification information includes special characters, and the special characters are usually two digits representing provincial information. The special characters are formed by a dynamic laser endorsement method and present a dynamic spatial image with a floating and sinking visual effect. The second endorsement device 6 endorses the second identification information on the license plate by laser. The second identification information includes a two-dimensional code and a serial number. The two-dimensional code or serial number is bound to the license plate information, vehicle information, driver information, etc. through a database. The special characters, two-dimensional code, and serial number are arranged in a fixed order, usually in the order of two-dimensional code, special characters, and serial number from left to right.

[0045] The track is used to transport the license plate 7. The track is provided with a plurality of conveyor wheel groups 8 for conveying the license plate 7. Specifically, the track includes two parallel conveying tracks, and the conveyor wheel groups 8 are provided on the inner sides of the two opposite conveying tracks. When transporting the license plate 7, the license plate 7 is horizontally placed on the conveyor wheel group 8, and the rotation of the conveyor wheel group 8 drives the transmission of the license plate 7. The track includes a first track 11, a second track 12 and a third track 13. A first diversion device 21 is provided between the first track 11 and the second track 12, and the first diversion device 21 is located before the license plate information collection device 3. The first track 11 is connected to the second track 12 through the first diversion device 21. The first diversion device 21 is provided with a plurality of conveyor wheel groups 8 for transporting the license plate 7. A turnover box 91 is arranged below the second track 12. The first track 11 is connected to the turnover box 91 through the first diversion device 21. The conveyor wheel group 8 of the first track 11 rotates to convey the license plate 7 onto the first diversion device 21. When the first endorsement device 4 is in a working state, if there is still a license plate 7 being conveyed from the track to the first endorsement device 4 at this time, the control system controls the end of the first diversion device 21 to descend, and guides the license plate 7 into the turnover box 91. Otherwise, it controls the first diversion device 21 to connect the first track and the second track. The first diversion device 21 includes two parallel long rods 211 and a push-pull cylinder. A plurality of conveyor wheel groups 8 for conveying the license plate 7 are provided on the opposite surfaces of the two long rods 211. One ends of the two long rods 211 are respectively rotatably connected to the end of the first track 11. The other ends of the two long rods 211 are not connected to the second track 12. A cross bar 212 is provided between the ends of the long rods 211. A push-pull cylinder is fixed at the bottom of the first diversion device 21. The cylinder body 213 of the push-pull cylinder is arranged below the track, and the piston rod 214 of the push-pull cylinder is connected to the cross bar 212. When the piston rod 214 extends, the piston rod 214 pushes the cross bar 212 and the ends of the long rods 211 to rise. At this time, the ends of the long rods 211 are flush with the second track 12, and the conveyor wheel groups 8 on the long rods 211 are also flush with the conveyor wheel groups 8 on the second track 12. The conveyor wheel groups 8 on the first diversion device 21 can smoothly convey the license plate 7 onto the second track 12. When the piston rod 214 of the push-pull cylinder retracts, the piston rod 214 pulls the cross bar 212 and the ends of the long rods to descend. At this time, the ends of the long rods 211 are inclined downward, and the license plate 7 falls into the turnover box 91 under the action of the conveyor wheel groups 8 on the first diversion device 21 and the gravity. A second diversion device 22 is provided between the second track 12 and the third track 13, and the second diversion device 22 is located after the endorsement mark collection device 6. The second diversion device 22 has the same structure as the first diversion device 21. The second diversion device 22 is provided with a plurality of conveyor wheel groups 8 for driving the license plate 7. The second track 12 is connected to the third track 13 through the second diversion device 22. A waste box 92 is arranged below the third track 13. The second track 12 is connected to the waste box 92 through the second diversion device 22.When the piston rod 214 extends, the piston rod 214 pushes the cross bar 212 and the end of the long rod 211 to rise. At this time, the end of the long rod 211 is flush with the third track 13, and the conveyor wheel set 8 on the long rod 211 is also flush with the conveyor wheel set 8 on the third track 13. The conveyor wheel set 8 on the second shunting device 21 can smoothly convey the number plate 7 to the third track 13. When the piston rod 214 of the push-pull cylinder retracts, the piston rod 214 pulls the cross bar 212 and the end of the long rod 211 to descend. At this time, the end of the long rod 211 inclines downward, and the number plate 7 falls into the waste bin 92 under the action of the conveyor wheel set 8 on the second shunting device 22 and the action of gravity.

[0046] The license plate information acquisition device 3 is arranged on the track, before the first endorsing device 4 and the second endorsing device 5 and after the first shunt device 21. The license plate information acquisition device 3 includes a first CCD camera 31, a first lens 32 and a first light source 33. A first support 34 is provided on the track. The first CCD camera 31 and the first light source 32 are provided on the first support 34. The first CCD camera 31 is provided with the first lens 32, and the first light source 33 is located between the first lens 32 and the license plate 7. The first light source 33 provides light for the first CCD camera 31 to capture the license plate 7. The first CCD camera 31 captures the reflective film on the surface of the license plate 7 through the first lens 32 and uploads it to the control system. The identifier of the reflective film of the manufacturer that needs to be endorsed is stored in the control system. The control system determines whether the license plate conveyed from the track to the first endorsing device 4 can be endorsed based on the license plate information collected by the license plate information acquisition device 3. If so, it controls the first endorsing device 4 and the second endorsing device 5 to perform endorsement. If not, it controls the first endorsing device 4 and the second endorsing device 5 not to perform endorsement, and controls the second shunt device 22 to introduce the license plate 7 that cannot be endorsed into the waste bin 92. Specifically, the control system matches the identifier of the reflective film captured by the first CCD camera 31 with the identifier of the reflective film stored in the control system. The license plate 7 with a successful match is endorsed, and the license plate 7 with an unsuccessful match is conveyed on the second track 12 and conveyed to the waste bin 92 by the second shunt device 22. Among them, the identifier of the reflective film is an identifier provided on the surface of the reflective film for being recognized, preferably set at the lower right corner of the reflective film. The identifier of the reflective film can be the trademark of the reflective film manufacturer, the model of the reflective film, the color or other characteristic identifiers. The control system determines whether there is a license plate 7 conveyed from the track to the first endorsing device 4 based on the identifier of the reflective film collected by the license plate information acquisition device 3, and whether the reflective film on the license plate 7 is the reflective film of the matching manufacturer. If it is the reflective film of the matching manufacturer, it controls the first endorsing device 4 to perform the next endorsement on it. If not, it does not perform endorsement and controls the second shunt device 22 to introduce the license plate that does not need to be endorsed into the waste bin 92. The first endorsing device 4 is arranged on the track and after the license plate information acquisition device 3. The control system controls the first endorsing device 4 to endorse the first identification information on the license plate 7 with a successful match. In this embodiment, the first identification information is a special character. The first endorsing device 4 includes a first fiber laser 41 that provides a laser beam for endorsing the license plate 7, a first galvanometer and field lens assembly 42 for forming the special character endorsement pattern of the license plate 7, a diffuser 43, a one-dimensional moving platform 44 and an imaging lens 45. A first support column 46 is provided on the track. The first galvanometer and field lens assembly 42 is arranged on the upper part of the first support column 46 through a support. The rear end of the first galvanometer and field lens assembly 42 is connected with the first fiber laser 41. The diffuser 43 and the imaging lens 45 are sequentially arranged below the first galvanometer and field lens assembly 42. The one-dimensional moving platform 44 adjusts the displacement of the diffuser 43 in the vertical direction.The diffuser 43 can be provided as a single piece or multiple pieces. In this embodiment, two diffusers 43 are arranged in a staggered height. The diffuser 43 can be any one of optical devices with a diffusing effect, such as frosted optical glass, grating, microlens array, or cylindrical lens array. In this embodiment, frosted optical glass is preferably used. The diffuser 43 is located at the focal plane of the first galvanometer and field lens assembly 42, and the reflective film of the license plate 7 is located at the image plane of the imaging lens 45. The first fiber laser 41 emits laser light, and the laser light sequentially passes through the first galvanometer and field lens assembly 42 and the diffuser 43. Specifically, the laser beam emitted from the first fiber laser 41 is scanned along a graphic trajectory by the first galvanometer and field lens assembly 42, and then passes through the diffuser 43. Due to the scattering effect of the diffuser 43 on the laser light, the light diffusion angle increases, and then it is imaged by the imaging lens 45, thereby increasing the numerical aperture and further increasing the field of view angle, and finally a dynamic spatial image with floating and sinking effects is obtained for endorsement. The second endorsement device 5 is arranged on the track, and the positions of the second endorsement device 5 and the first endorsement device 4 can be interchanged. The second endorsement device 5 endorses the second identification information on the successfully matched license plate 7. In this embodiment, the second identification information is a two-dimensional code and a serial number. The control system controls the second endorsement device 5, including a second fiber laser 51 that provides a laser beam for endorsing the license plate 7, and a second galvanometer and field lens assembly 52 that is used to form the endorsement graphics of the serial number and the two-dimensional code. There is a second support column 53 on the track, and the second galvanometer and field lens assembly 52 is arranged on the upper part of the second support column 53 through a bracket. The second fiber laser 51 is connected to the rear end of the second galvanometer and field lens assembly 52. The laser beam emitted from the second fiber laser 51 is scanned along a graphic trajectory by the second galvanometer and field lens assembly 52 and then the serial number and the two-dimensional code are endorsed on the license plate 7, and the endorsed two-dimensional code is stored in the control system. Thus, the endorsement effect is improved, and the endorsed two-dimensional code can be recognized in real time. In addition, the present invention provides two endorsement stations, which improves the endorsement speed.

[0047] The endorsement identification acquisition device 6 acquires the second identification information endorsed on the license plate. The control system determines whether the second identification information acquired by the endorsement identification acquisition device 6 is correct. In this embodiment, the endorsement identification acquisition device 6 acquires a two-dimensional code, and the control system determines whether the two-dimensional code is correct. If it is correct, the second diversion device 22 is controlled to transfer the license plate 7 to the third track 13. If it is incorrect, the second diversion device 22 is controlled to introduce the license plate into the waste box 92. The second identification device, the endorsement identification acquisition device 6, includes a second CCD camera 61, a second lens 62, and a second light source 63. A second bracket 64 is provided on the track. The second CCD camera 61 and the second light source 63 are provided on the second bracket 64. The second CCD camera 61 is provided with the second lens 62, and the second light source 63 is located between the second lens 62 and the license plate 7. The second light source 63 provides light for the second CCD camera 61 to capture the license plate 7. The second CCD camera 61 captures the two-dimensional code on the surface of the license plate via the second lens and uploads it to the control system. The control system determines whether the two-dimensional code is correct, controls the second diversion device 22 to introduce the license plate with incorrect second identification information endorsed into the waste box 92, and controls the second diversion device 22 to introduce the license plate determined to be correct onto the third track 13.

[0048] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A license plate endorsement system, characterized in that, Including: A track for conveying license plates, A first endorsing device disposed at a first position on the track, which uses a laser to endorse first identification information on the license plate conveyed to the first position by the track; A second endorsing device disposed at a second position on the track, which uses a laser to endorse second identification information on the license plate conveyed to the second position by the track; It further includes a first diversion device disposed on the track and before the first endorsing device and the second endorsing device. The first diversion device divides the track into a first track and a second track. The first track is connected to a turnover box or the second track through the first diversion device, A control system, when the first endorsing device is in a working state and there are still license plates being conveyed from the track to the first endorsing device, controls the first diversion device to guide the first track into the turnover box; otherwise, controls the first diversion device to connect the first track to the second track; A license plate information acquisition device is further disposed on the track. The license plate information acquisition device is located before the first endorsing device and the second endorsing device and after the first diversion device, The license plate information acquisition device is used to acquire the license plate information of the license plate conveyed from the track to the first endorsing device and upload it to the control system; The license plate information acquisition device includes a first CCD camera, a first lens, and a first light source, A first support is provided on the track. The first CCD camera and the first light source are provided on the first support. The first CCD camera is provided with a first lens. The first light source is located between the first lens and the license plate, The first light source provides light for the first CCD camera to photograph the license plate. The first CCD camera photographs the identification on the reflective film surface of the license plate through the first lens and uploads it to the control system. The control system will determine whether it matches the identification of the reflective film of the manufacturer to be endorsed.

2. The license plate endorsement system according to claim 1, wherein The control system determines whether the license plate conveyed from the track to the first endorsing device can be endorsed based on the acquired license plate information. If it can, controls the first endorsing device and the second endorsing device to perform endorsement; if not, controls the first endorsing device and the second endorsing device not to perform endorsement.

3. The license plate endorsement system according to claim 1, characterized in that, The first endorsing device includes a first fiber laser for providing a laser beam for endorsing the license plate, a first galvanometer and field lens assembly for forming the first identification information, a diffuser for changing the angle of the laser beam, a one-dimensional moving platform, and an imaging lens, A first support pillar is provided on the track. The first galvanometer and field lens assembly is disposed on the upper part of the first support pillar through a support. The rear end of the first galvanometer and field lens assembly is connected to a first fiber laser. A diffuser and an imaging lens are sequentially disposed below the first galvanometer and field lens assembly. The diffuser is provided as a single piece or multiple pieces. The diffuser is installed on the one-dimensional moving platform. The one-dimensional moving platform adjusts the displacement of the diffuser in the vertical direction. The diffuser is located at the focal plane of the first galvanometer and field lens assembly. The reflective film of the license plate is located at the image plane of the imaging lens, The laser beam emitted from the first fiber laser first scans the graphic track through the first galvanometer and field lens assembly, and then is converged by the imaging lens after passing through the diffuser to increase the diffusion angle, and the first identification information is signed on the license plate through the imaging lens.

4. The license plate endorsement system according to claim 3, wherein, The diffusion sheets are provided with two sheets, and the two diffusion sheets are arranged in a staggered manner of high and low.

5. The license plate endorsement system according to claim 3, wherein The diffusion sheet is an optical device with a diffusion effect.

6. The license plate endorsement system according to claim 5, characterized in that, The optical device is selected from any one of frosted optical glass, grating, microlens array or cylindrical lens array.

7. The license plate endorsement system according to claim 1, wherein, The second signing device includes a second fiber laser for providing a laser beam for the license plate signing, a second galvanometer and a field mirror assembly for forming the second identification information, A second support column is provided on the track, and the second galvanometer and field lens assembly is arranged on the upper part of the second support column through a bracket, and a second fiber laser is connected to the rear end of the second galvanometer and field lens assembly. The laser beam emitted from the second optical fiber laser scans a graphic track through the second galvanometer and field lens assembly to annotate the second identification information on the license plate.

8. The license plate endorsement system according to claim 1, characterized in that: The first identification information includes special symbols; The second identification information includes a QR code and a serial number.

9. The license plate endorsement system according to claim 1, wherein It also includes: A second diverter device is arranged on the track and is located after the first endorsement device and the second endorsement device. The second diverter device divides the track into the second track and a third track. A waste box is arranged under the third track. The second track is connected to the third track or the waste box through the second diverter device.

10. The license plate endorsement system according to claim 9, characterized in that, It also includes a signature identification collection device, which collects the second identification information signed on the license plate with the first identification information and the second identification information, and the signature identification collection device is arranged on the track and located before the second diversion device; The control system determines whether the second identification information collected by the endorsement and identification collection device is correct. If correct, the control system controls the second diversion device to import the license plate with the correct second identification information into the third track. If incorrect, the control system controls the second diversion device to import the license plate with the incorrect second identification information into the waste bin.

11. The license plate endorsement system according to claim 10, characterized in that, The endorsement mark collection device includes a second CCD camera, a second lens and a second light source. A second bracket is provided on the track, a second CCD camera and a second light source are provided on the second bracket, the second CCD camera is provided with a second lens, and the second light source is located between the second lens and the license plate. The second light source provides light for the second CCD camera to photograph the license plate. The second CCD camera photographs the QR code on the signed license plate via the second lens and uploads it to the control system, which determines whether the QR code is correct.

12. The license plate endorsement system according to claim 1, characterized in that, The first diversion device includes two long rods arranged in parallel and a push-pull cylinder. A plurality of transmission wheel groups for transmitting license plates are arranged on the opposite inner sides of the two long rods. One end of the two long rods is rotatably connected to the end of the first track respectively, and the other end of the two long rods is not connected to the second track. A cross bar is arranged between the ends of the two long rods. The cylinder body of the push-pull cylinder is arranged below the track, and the piston rod of the push-pull cylinder is connected to the cross bar.

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