A vehicle identification code image acquisition instrument code recognition rate test device

Abstract

The utility model provides a kind of vehicle identification code image acquisition instrument character recognition rate test device, including box, distance reference plate, acquisition instrument fixed assembly and standard plate adjusting assembly.The utility model can respectively accurately control the angle of standard VIN code plate, the distance with acquisition instrument and the ambient illumination intensity by the rotating drive mechanism in standard plate adjusting assembly, translation drive mechanism, illumination generator device, collate angle detection device, displacement detection device, illumination intensity detection device, can acquire and feedback each variable parameter in real time, realize the accurate simulation and monitoring to character recognition rate influencing factor, and overall device can efficiently, accurately carry out vehicle identification code image acquisition instrument character recognition rate test.

Description

Technical Field

[0001] This utility model relates to the field of equipment metrology calibration and testing technology, specifically a test device for the character code recognition rate of a vehicle identification number image acquisition instrument. Background Technology

[0002] A Vehicle Identification Number (VIN) is a set of characters assigned by the vehicle manufacturer according to national vehicle management standards to identify a vehicle. In accordance with standards such as GA 801—2019 "Motor Vehicle Inspection Procedures" and GA / T 1984—2022 "Vehicle Identification Number Collection and Verification Procedures," vehicle inspections must include VIN imprinting and photographing to ensure the uniqueness of vehicles and protect public safety and property.

[0003] Vehicle Identification Number (VIN) image acquisition devices utilize image recognition principles to reconstruct the VIN at a 1:1 ratio, generating an electronic VIN code. This enables convenient and efficient electronic archiving of VIN images. Printed paper VIN codes can replace rubbings, improving vehicle inspection efficiency. Currently, there is a lack of relevant technical standards for VIN image acquisition devices, and the performance of equipment from different manufacturers varies considerably, particularly in key indicators such as size reproduction accuracy and character recognition rate. In actual shooting scenarios, the character recognition rate is directly related to factors such as the distance between the acquisition device and the VIN image, the shooting angle of the photographer, and the intensity of ambient light. Therefore, designing a device that can specifically test the conditions affecting the character recognition rate of the VIN image acquisition device is crucial to ensure the effectiveness of the equipment. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a character code recognition rate vehicle identification code image acquisition instrument character code recognition rate test device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is: a vehicle identification number image acquisition instrument character code recognition rate testing device, comprising:

[0006] Box;

[0007] A distance reference plate is vertically installed in the middle of the housing. The distance reference plate divides the internal space of the housing into a data acquisition instrument placement area and a standard plate adjustment area. The distance reference plate is provided with a shooting window that runs through the front and back.

[0008] A data acquisition device fixing assembly is used to fix the data acquisition device being tested, and the data acquisition device fixing assembly is located in the data acquisition device placement area;

[0009] A standard plate adjustment assembly, located in the standard plate adjustment area, includes a standard VIN code plate, a clamping turntable, a support frame, a rotation drive mechanism, an angle detection device, a translation drive mechanism, a displacement detection device, a light generation device, and a light intensity detection device. The standard VIN code plate is disposed on the clamping turntable, which is rotatably mounted on the support frame. The rotation drive mechanism drives the clamping turntable and the standard VIN code plate to swing relative to the support frame within a set angle range. The angle detection device detects the swing angle of the standard VIN code plate relative to the support frame. The translation drive mechanism drives the support frame and the standard VIN code plate to translate relative to a distance reference plate. The displacement detection device detects the distance between the standard VIN code plate and the distance reference plate. The light generation device generates light within the standard plate adjustment area. The light intensity detection device detects the light intensity at the position of the standard VIN code plate.

[0010] This invention divides the internal space of the enclosure using a distance reference plate, enabling the separate arrangement of the data acquisition device and the standard VIN code board. The structural layout is clear and does not interfere with each other. Utilizing the rotation drive mechanism, translation drive mechanism, and light-generating device in the standard board adjustment assembly, the angle of the standard VIN code board, its distance from the data acquisition device, and the ambient light intensity can be precisely controlled. Combined with angle detection devices, displacement detection devices, and light intensity detection devices, these parameters can be acquired and fed back in real time, enabling precise simulation and monitoring of factors affecting the code recognition rate. This solves the problem of not being able to control multiple variables simultaneously in existing technologies. Simultaneously, the data acquisition device fixing assembly stably fixes the data acquisition device under test, ensuring a stable shooting position and avoiding test errors caused by data acquisition device shaking. The entire device can efficiently and accurately conduct VIN code image acquisition device code recognition rate tests, providing a reliable basis for equipment performance verification.

[0011] Furthermore, the data acquisition device fixing assembly includes a fixed support plate, a vertical slide rail, a lifting drive mechanism, and a clamping mechanism. The vertical slide rail is fixed to the front side of the distance reference plate. The fixed support plate is mounted on the slider of the vertical slide rail. The data acquisition device to be detected is placed on the fixed support plate. The clamping mechanism is mounted on the fixed support plate and clamps the data acquisition device to be detected from the left and right sides. The lifting drive mechanism is used to drive the fixed support plate to move up and down along the vertical slide rail.

[0012] Using the above-mentioned preferred scheme, the vertical slide rail provides stable guidance for the lifting and lowering of the fixed support plate, ensuring that the fixed support plate does not deviate during the lifting and lowering process; the lifting drive mechanism can drive the fixed support plate to adjust its height along the vertical slide rail, thereby adapting to the camera height of different-sized data acquisition devices, so that the data acquisition device camera can be accurately aligned with the shooting window; the clamping mechanism clamps the data acquisition device from the left and right sides, preventing the data acquisition device from shifting left and right during the test, further improving the stability of the data acquisition device fixation, effectively adapting to data acquisition devices of different widths, and improving the compatibility of the device.

[0013] Furthermore, the lifting drive mechanism includes a first handwheel, a lead screw, a nut seat, a first connecting rod, and a second connecting rod. A first hinge seat, a first bearing seat, and a second bearing seat are fixedly installed on the bottom plate of the box located at the front side of the reference plate. A first connecting frame is fixedly installed on the left end of the bottom surface of the fixed support plate, and a second connecting frame is fixedly installed on the right end of the bottom surface of the fixed support plate. The two ends of the lead screw are rotatably installed on the first bearing seat and the second bearing seat respectively via bearings. The first handwheel is drivenly connected to the end of the lead screw. The nut seat is threadedly installed on the lead screw. The middle position of the first connecting rod and the middle position of the second connecting rod are hinged together. The lower end of the first connecting rod is hinged to the nut seat, and the upper end of the first connecting rod is hinged to the first connecting frame. The second connecting frame is provided with a horizontal elongated groove. The lower end of the second connecting rod is hinged to the first hinge seat, and the upper end of the second connecting rod is rotatably connected to the groove of the second connecting frame via a rotating shaft and can move left and right along the groove.

[0014] Using the preferred scheme described above, rotating the first handwheel drives the lead screw to rotate, which in turn drives the nut seat to move along the lead screw axis. During the movement of the nut seat, the lower end of the first connecting rod moves. Since the first connecting rod and the second connecting rod are hinged at the middle, and the lower end of the second connecting rod is hinged to the first hinge seat, the angle between the first connecting rod and the second connecting rod changes, thereby pushing the fixed support plate to rise and fall along the vertical slide rail. This structure achieves lifting and adjustment through lead screw transmission, which has high transmission accuracy and can precisely control the lifting and lowering height of the fixed support plate, ensuring accurate adjustment of the camera height of the data acquisition instrument. At the same time, the connecting rod structure provides stable support and can withstand the weight of the data acquisition instrument, preventing the fixed support plate from shaking after lifting and lowering, and ensuring the stability of the data acquisition instrument position during the test.

[0015] Further, the clamping mechanism includes a left support, a right support, a guide rod, a bidirectional threaded screw, a left moving block, a left clamping plate, a right moving block, a right clamping plate, and a second handwheel. The left support is fixed to the left end of the upper surface of the fixed support plate, and the right support is fixed to the right end of the upper surface of the fixed support plate. The two ends of the guide rod are respectively connected to the left and right supports. The two ends of the bidirectional threaded screw are respectively rotatably mounted on the left and right supports. The left and right halves of the bidirectional threaded screw have threaded sections with opposite directions of rotation. The left moving block passes through the guide rod and is connected to the threaded section of the left half of the bidirectional threaded screw. The left clamping plate is fixedly connected to the left moving block. The right moving block passes through the guide rod and is connected to the threaded section of the right half of the bidirectional threaded screw. The right clamping plate is fixedly connected to the right moving block. The second handwheel is drivenly connected to the end of the bidirectional threaded screw.

[0016] Using the preferred scheme described above, rotating the second handwheel drives the bidirectional threaded screw to rotate. Since the left and right halves of the bidirectional threaded screw have opposite thread directions, and the left and right moving blocks are connected to their corresponding thread segments, while the guide rod guides the moving blocks, the rotation of the bidirectional threaded screw will cause the left and right moving blocks to move in opposite directions along the guide rod, thereby causing the left and right clamping plates to move closer or further away synchronously, thus clamping or releasing the data acquisition device. This structure is easy to operate, requiring only the rotation of the handwheel to complete the clamping adjustment, and can achieve synchronous movement of the left and right clamping plates, ensuring that the data acquisition device is located in the middle of the fixed support plate when clamped, avoiding the data acquisition device shifting and causing the camera to be unable to align with the shooting window; at the same time, it is compatible with data acquisition devices of different widths, further improving the device's compatibility with data acquisition devices of different specifications.

[0017] Furthermore, the fixed support plate is also provided with a support sub-plate whose vertical position is adjustable. The support sub-plate is provided with an elongated hole in the vertical direction. The support sub-plate is connected to the fixed support plate by bolts passing through the elongated hole.

[0018] Using the preferred design described above, the support plate can be adjusted vertically via the elongated hole and bolts. When the data acquisition device is relatively short, the support plate can be moved upwards to cooperate with the fixed support plate to support the bottom of the data acquisition device from above and below, preventing the device from tilting due to unstable bottom support. When the data acquisition device is relatively long, the support plate can be moved downwards without affecting the placement of the device. This design further adapts to data acquisition devices of different heights, improves the stability of the device placement, reduces shooting errors caused by device tilt, and ensures test accuracy.

[0019] Furthermore, the translation drive mechanism includes a first motor, a guide rail slide, a transmission screw, and a slider. The length direction of the guide rail slide is perpendicular to the plane of the distance reference plate. The transmission screw is arranged parallel to the guide rail slide. The first motor drives the transmission screw to rotate via a transmission mechanism. The slider is movably mounted on the guide rail slide. A nut is threaded onto the transmission screw and fixedly connected to the slider. The support frame is fixedly connected above the slider. The displacement detection device is a grating ruler arranged parallel to the guide rail slide, and the reading head of the grating ruler is fixedly connected to the support frame.

[0020] Using the preferred scheme described above, the first motor drives the transmission screw to rotate through the transmission mechanism. The transmission screw drives the nut and slider to move along the guide rail slide, thereby driving the support frame and the standard VIN code plate to move synchronously. This achieves automatic adjustment of the distance between the standard VIN code plate and the distance reference plate (i.e., the data acquisition instrument), which is more efficient and accurate than manual adjustment. The guide rail slide provides stable guidance for the slider's translation, avoiding distance adjustment errors caused by slider deviation. At the same time, the reading head of the grating ruler moves with the support frame, which can accurately detect the displacement of the support frame in real time, thereby obtaining the actual distance between the standard VIN code plate and the data acquisition instrument. The data is then fed back to the control system to achieve accurate monitoring and closed-loop control of the distance parameters, ensuring the accuracy of the distance simulation and providing accurate distance variable conditions for the character code recognition rate test.

[0021] Furthermore, the rotary drive mechanism includes a second motor, a driving wheel, a driven wheel, a transmission belt, and a rotating rod. The base of the second motor is fixedly connected to the support frame. The driving wheel is fixedly connected to the output shaft of the second motor. The driven wheel is fixedly connected to the end of the rotating rod. The transmission belt connects the driving wheel and the driven wheel. The rotating rod is rotatably mounted on the support frame. The rear side of the clamping turntable is fixedly connected to the rotating rod. The angle detection device is fixedly mounted on the back of the clamping turntable.

[0022] Using the preferred scheme described above, the second motor drives the drive wheel to rotate, which in turn drives the driven wheel and rotating rod to rotate via a transmission belt. The rotating rod drives the clamping turntable and the standard VIN code plate to rotate synchronously, achieving automatic adjustment of the standard VIN code plate angle. This allows for precise control of the standard VIN code plate's swing within a set angle range, simulating different shooting angle scenarios. An angle detection device is installed on the back of the clamping turntable, which can directly detect the rotation angle of the clamping turntable, thereby obtaining the actual angle of the standard VIN code plate and providing real-time feedback of angle parameters. This enables precise monitoring and adjustment of the angle, ensuring the accuracy of angle variable simulation.

[0023] Furthermore, the light-generating device includes an upper LED light board and a lower LED light board mounted on the rear wall of the distance reference plate. The upper LED light board is located above the shooting window, and the lower LED light board is located below the shooting window. The light intensity detection device is mounted on the support frame and is located behind and above the clamping turntable.

[0024] Using the preferred scheme described above, the upper and lower LED light boards are located above and below the shooting window, respectively, allowing for uniform illumination of the standard VIN code board from both sides. This avoids uneven illumination on the surface of the standard VIN code board caused by unilateral lighting, ensuring the realism of the simulated lighting environment and more closely resembling the lighting conditions in actual shooting scenarios. The light intensity detection device is mounted on the support frame and located high behind the clamping turntable. This allows for real-time detection of the light intensity around the standard VIN code board without obstructing it, thus avoiding interference with the acquisition device's shooting. Furthermore, the proximity of the detection position to the standard VIN code board results in more accurate detection data and real-time feedback of light intensity parameters. This facilitates adjustment of the LED light board brightness according to testing requirements, enabling precise control of the light intensity.

[0025] Furthermore, the front of the container is provided with an openable and closable main hatch, and the left or right side of the container is provided with an openable and closable auxiliary hatch; an operating port is provided on the left and right side walls of the container near the main hatch, and a flexible light-shielding sleeve extending inward is connected to the operating port.

[0026] By adopting the above-mentioned preferred scheme, the main door facilitates the placement or removal of the instrument to be tested by the operator, while the auxiliary door facilitates the inspection, maintenance, or replacement of the standard VIN code plate for the components in the standard plate adjustment area, improving the convenience of use and maintenance of the device; the operating ports on the left and right side walls allow the operator to reach into the chamber to operate the instrument, and the flexible light-shielding sleeve can fit tightly against the operator's hand when reaching in, effectively blocking external light from entering the chamber from the operating port, avoiding interference from external light on the lighting environment inside the chamber, ensuring the accuracy of the light intensity simulation, and guaranteeing the reliability of the test results.

[0027] Furthermore, a power module for power supply is provided in the standard plate adjustment area; a touch screen is also provided on the outside of the housing, and a controller is also included, which is signal connected to the touch screen and the standard plate adjustment assembly.

[0028] By adopting the above-mentioned preferred scheme, the power module provides stable power to the motor, LED light board, sensors and other components in the standard board adjustment assembly, improving the portability of the device and facilitating on-site testing. The touch screen works in conjunction with the controller, allowing operators to input test parameters (such as distance, angle, and light intensity) through the touch screen. After receiving the instructions, the controller controls the standard board adjustment assembly to perform corresponding actions. At the same time, the controller can receive data from each sensor and display it on the touch screen in real time, allowing operators to intuitively understand the various variable parameters during the test process. This enables visualized operation and monitoring of the test process, improving the ease of operation and intelligence of the device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is one of the perspective views of one embodiment of the experimental device of this utility model.

[0031] Figure 2 This is a second perspective view of one embodiment of the experimental device of this utility model.

[0032] Figure 3 This is a cross-sectional view of one embodiment of the experimental device of this utility model.

[0033] Figure 4 This is one of the three-dimensional schematic diagrams of the interior of the test device box of this utility model.

[0034] Figure 5 This is the second three-dimensional schematic diagram of the interior of the test device housing of this utility model.

[0035] Figure 6 This is a structural diagram of the fixed components of the data acquisition instrument.

[0036] Figure 7 This is a schematic diagram of the standard plate adjustment assembly.

[0037] The numbers and letters in the diagram represent the names of the corresponding components:

[0038] 10-Box body; 11-Data acquisition instrument placement area; 12-Standard plate adjustment area; 13-Main hatch; 14-Sub-hatch door; 15-Operating port; 151-Light shield; 16-Touch display screen; 20-Distance reference plate; 21-Shooting window; 30-Data acquisition instrument fixing assembly; 31-Fixing support plate; 311-Second connecting frame; 312-First connecting frame; 313-Slide groove; 314-Support sub-plate; 315-Elongated hole; 32-Vertical slide rail; 33-Lifting drive mechanism; 331-First handwheel; 332-Screw rod; 333-Nut seat; 334-First connecting rod; 335-Second connecting rod; 336-First hinge seat; 337-First bearing seat; 338-Second bearing seat; 34-Clamping mechanism; 341-Left support; 342-Right support; 343-Guide rod; 3 44-Double-direction threaded screw; 345-Left moving block; 346-Left clamping plate; 347-Right moving block; 348-Right clamping plate; 349-Second handwheel; 40-Standard plate adjustment assembly; 41-Standard VIN code plate; 42-Clamping turntable; 43-Support frame; 44-Rotation drive mechanism; 441-Second motor; 442-Driving wheel; 443-Driven wheel; 444-Transmission belt; 445-Rotating rod; 45-Angle detection device; 46-Translation drive mechanism; 461-First motor; 462-Guide rail slide; 463-Transmission screw; 464-Slider; 47-Displacement detection device; 471-Grating ruler; 472-Reading head; 481-Upper LED light board; 482-Lower LED light board; 49-Light intensity detection device; 50-Power module; 60-Data acquisition device. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] like Figure 1-7 As shown, one embodiment of this utility model is: a vehicle identification number image acquisition instrument character code recognition rate testing device, comprising:

[0041] Box 10;

[0042] The distance reference plate 20 is vertically installed in the middle of the housing 10. The distance reference plate 20 divides the internal space of the housing into the acquisition instrument placement area 11 and the standard plate adjustment area 12. The distance reference plate 20 is provided with a front-to-back shooting window 21.

[0043] The data acquisition device fixing component 30 is used to fix the data acquisition device 60 being tested. The data acquisition device fixing component 30 is located in the data acquisition device placement area 11.

[0044] The standard plate adjustment assembly 40 is located in the standard plate adjustment area 12. The standard plate adjustment assembly 40 includes a standard VIN code plate 41, a clamping turntable 42, a support frame 43, a rotary drive mechanism 44, an angle detection device 45, a translation drive mechanism 46, a displacement detection device 47, a light generating device, and a light intensity detection device 49. The standard VIN code plate 41 is mounted on the clamping turntable 42, which is rotatably mounted on the support frame 43. The rotary drive mechanism 44 drives the clamping turntable 42 and the standard VIN code plate 41 relative to each other. The support frame 43 swings within a set angle range. The angle detection device 45 is used to detect the swing angle of the standard VIN code plate 41 relative to the support frame 43. The translation drive mechanism 46 is used to drive the support frame 43 and the standard VIN code plate 41 to translate relative to the distance reference plate 20. The displacement detection device 47 is used to detect the distance between the standard VIN code plate 41 and the distance reference plate 20. The light generating device is used to generate light inside the standard plate adjustment area 12. The light intensity detection device 49 is used to detect the light intensity at the position of the standard VIN code plate.

[0045] The beneficial effects of adopting the above technical solution are as follows: The internal space of the enclosure is divided by a distance reference plate, allowing for the partitioned arrangement of the data acquisition device and the standard VIN code board, resulting in a clear structural layout without mutual interference. With the help of the rotation drive mechanism, translation drive mechanism, and light-generating device in the standard board adjustment assembly, the angle of the standard VIN code board, its distance from the data acquisition device, and the ambient light intensity can be precisely controlled separately. Combined with angle detection devices, displacement detection devices, and light intensity detection devices, these parameters can be acquired and fed back in real time, enabling precise simulation and monitoring of factors affecting the code recognition rate, thus solving the problem of not being able to control multiple variables simultaneously in existing technologies. Simultaneously, the data acquisition device fixing assembly can stably fix the data acquisition device under test, ensuring a stable shooting position and avoiding test errors caused by data acquisition device shaking. The overall device can efficiently and accurately conduct VIN code image acquisition device code recognition rate tests, providing a reliable basis for equipment performance verification.

[0046] like Figure 4 , 6As shown, in some other embodiments of this utility model, the data acquisition device fixing assembly 30 includes a fixed support plate 31, a vertical slide rail 32, a lifting drive mechanism 33, and a clamping mechanism 34. The vertical slide rail 32 is fixed to the front side of the reference plate 20. The fixed support plate 31 is mounted on the slider of the vertical slide rail 32. The data acquisition device 60 to be detected is placed on the fixed support plate 31. The clamping mechanism 34 is mounted on the fixed support plate 31 and clamps the data acquisition device to be detected from the left and right sides. The lifting drive mechanism 33 is used to drive the fixed support plate 31 to move up and down along the vertical slide rail 32. The beneficial effects of adopting the above technical solution are as follows: the vertical slide rail provides stable guidance for the lifting and lowering of the fixed support plate, ensuring that the fixed support plate does not deviate during the lifting and lowering process; the lifting drive mechanism can drive the fixed support plate to adjust its height along the vertical slide rail, thereby adapting to the camera height of different sized data acquisition devices, so that the data acquisition device camera can be accurately aligned with the shooting window; the clamping mechanism clamps the data acquisition device from the left and right sides, preventing the data acquisition device from shifting left and right during the test, further improving the stability of the data acquisition device fixation, effectively adapting to data acquisition devices of different widths, and improving the compatibility of the device.

[0047] like Figure 6As shown, in some other embodiments of this utility model, the lifting drive mechanism 33 includes a first handwheel 331, a lead screw 332, a nut seat 333, a first connecting rod 334, and a second connecting rod 335. A first hinge seat 336, a first bearing seat 337, and a second bearing seat 338 are fixedly installed on the bottom plate of the housing located at the front side of the reference plate. A first connecting frame 312 is fixedly installed on the left end of the bottom surface of the fixed support plate 31, and a second connecting frame 311 is fixedly installed on the right end of the bottom surface of the fixed support plate 31. The two ends of the lead screw 332 are rotatably mounted on the first bearing seat 337 and the second bearing seat 338 via bearings. A handwheel 331 is connected to the end of a lead screw 332. A nut seat 333 is threaded onto the lead screw 332. The middle position of the first connecting rod 334 and the middle position of the second connecting rod 335 are hinged together. The lower end of the first connecting rod 334 is hinged to the nut seat 333, and the upper end of the first connecting rod 334 is hinged to the first connecting frame 312. The second connecting frame 311 is provided with a horizontal elongated groove 313. The lower end of the second connecting rod 335 is hinged to the first hinge seat 336. The upper end of the second connecting rod 335 is rotatably connected to the groove 313 of the second connecting frame via a rotating shaft and can move left and right along the groove 313. The beneficial effects of adopting the above technical solution are as follows: By rotating the first handwheel, the lead screw is driven to rotate, and the lead screw drives the nut seat to move along the lead screw axis. During the movement of the nut seat, the lower end of the first connecting rod moves. Since the first connecting rod and the second connecting rod are hinged in the middle, and the lower end of the second connecting rod is hinged to the first hinge seat, the included angle between the first connecting rod and the second connecting rod changes, thereby pushing the fixed support plate to rise and fall along the vertical slide rail. This structure achieves lifting and adjustment through lead screw transmission, with high transmission accuracy, which can accurately control the lifting and lowering height of the fixed support plate and ensure accurate adjustment of the height of the acquisition instrument camera. At the same time, the connecting rod structure provides stable support and can withstand the weight of the acquisition instrument, preventing the fixed support plate from shaking after lifting and lowering, and ensuring the stability of the acquisition instrument position during the test.

[0048] like Figure 6As shown, in some other embodiments of this utility model, the clamping mechanism 34 includes a left support 341, a right support 342, a guide rod 343, a bidirectional threaded screw 344, a left moving block 345, a left clamping plate 346, a right moving block 347, a right clamping plate 348, and a second handwheel 349. The left support 341 is fixed to the left end of the upper surface of the fixed support plate 31, and the right support 342 is fixed to the right end of the upper surface of the fixed support plate 31. The two ends of the guide rod 343 are respectively connected to the left support 341 and the right support 342, and the two ends of the bidirectional threaded screw 344 are respectively rotatable. The left and right halves of the bidirectional threaded screw 344 are dynamically installed on the left support 341 and the right support 342. The left and right halves of the bidirectional threaded screw 344 have threaded sections with opposite directions of rotation. The left moving block 345 passes through the guide rod 343 and is connected to the threaded section of the left half of the bidirectional threaded screw 344. The left clamping plate 346 is fixedly connected to the left moving block 345. The right moving block 347 passes through the guide rod 343 and is connected to the threaded section of the right half of the bidirectional threaded screw 344. The right clamping plate 348 is fixedly connected to the right moving block 347. The second handwheel 349 is connected to the end of the bidirectional threaded screw 344 for transmission. The beneficial effects of adopting the above technical solution are as follows: Rotating the second handwheel drives the bidirectional threaded screw to rotate. Since the left and right halves of the bidirectional threaded screw rotate in opposite directions, and the left and right moving blocks are connected to the corresponding threaded sections respectively, while the guide rod guides the moving blocks, the rotation of the bidirectional threaded screw will drive the left and right moving blocks to move in opposite directions along the guide rod, thereby driving the left and right clamping plates to move closer or further away synchronously, thus clamping or releasing the data acquisition device. This structure is easy to operate, requiring only the rotation of the handwheel to complete the clamping adjustment, and can achieve synchronous movement of the left and right clamping plates, ensuring that the data acquisition device is located in the middle of the fixed support plate when clamped, avoiding the data acquisition device shifting and causing the camera to be unable to align with the shooting window; at the same time, it is compatible with data acquisition devices of different widths, further improving the compatibility of the device with data acquisition devices of different specifications.

[0049] like Figure 6 As shown, in some other embodiments of this utility model, the fixed support plate 31 is further provided with a vertically adjustable support sub-plate 314. The support sub-plate 314 has an elongated hole 315 in the vertical direction, and the support sub-plate 314 is connected to the fixed support plate 31 by bolts passing through the elongated hole 315. The beneficial effects of adopting the above technical solution are: the vertical position of the support sub-plate can be adjusted by the cooperation of the elongated hole and the bolt. When the height of the data acquisition instrument is small, the support sub-plate is adjusted to move upward, cooperating with the fixed support plate to support the bottom of the data acquisition instrument from the vertical direction, preventing the data acquisition instrument from tilting due to unstable bottom support; when the height of the data acquisition instrument is large, the support sub-plate is adjusted to move downward, without affecting the placement of the data acquisition instrument; this design further adapts to data acquisition instruments of different heights, improves the stability of the data acquisition instrument placement, reduces shooting errors caused by the tilt of the data acquisition instrument, and ensures the accuracy of the test.

[0050] like Figure 5 , 7As shown, in some other embodiments of this utility model, the translation drive mechanism 46 includes a first motor 461, a guide rail slide 462, a transmission screw 463, and a slider 464. The length direction of the guide rail slide 462 is perpendicular to the plane of the distance reference plate 20. The transmission screw 463 is arranged parallel to the guide rail slide 462. The first motor 461 drives the transmission screw 463 to rotate via the transmission mechanism. The slider 464 is translatably mounted on the guide rail slide 462. A nut is threadedly connected to the transmission screw 463, and the nut is fixedly connected to the slider 464. The support frame 43 is fixedly connected above the slider 464. The displacement detection device 47 is a grating ruler 471 arranged parallel to the guide rail slide 462. The reading head 472 of the grating ruler is fixedly connected to the support frame 43. The beneficial effects of adopting the above technical solution are as follows: The first motor drives the transmission screw to rotate through the transmission mechanism. The transmission screw drives the nut and the slider to move along the guide rail slide, thereby driving the support frame and the standard VIN code plate to move synchronously. This achieves automatic adjustment of the distance between the standard VIN code plate and the distance reference plate (i.e., the data acquisition instrument), which is more efficient and accurate than manual adjustment. The guide rail slide provides stable guidance for the slider's translation, avoiding distance adjustment errors caused by slider deviation. At the same time, the reading head of the grating ruler moves with the support frame, which can accurately detect the displacement of the support frame in real time, thereby obtaining the actual distance between the standard VIN code plate and the data acquisition instrument, and feeding the data back to the control system to achieve accurate monitoring and closed-loop control of the distance parameters, ensuring the accuracy of the distance simulation and providing accurate distance variable conditions for the character code recognition rate test.

[0051] like Figure 7 As shown, in some other embodiments of this utility model, the rotary drive mechanism 44 includes a second motor 441, a driving wheel 442, a driven wheel 443, a transmission belt 444, and a rotating rod 445. The base of the second motor 441 is fixedly connected to the support frame 43. The driving wheel 442 is fixedly connected to the output shaft of the second motor 441. The driven wheel 443 is fixedly connected to the end of the rotating rod 445. The transmission belt 444 is connected between the driving wheel 442 and the driven wheel 443. The rotating rod 445 is rotatably mounted on the support frame 43. The rear side of the clamping turntable 42 is fixedly connected to the rotating rod 445. The angle detection device 45 is fixedly mounted on the back side of the clamping turntable 42. The beneficial effects of adopting the above technical solution are as follows: The second motor drives the active wheel to rotate, and the active wheel drives the driven wheel and rotating rod to rotate through the transmission belt. The rotating rod drives the clamping turntable and the standard VIN code plate to rotate synchronously, realizing the automatic adjustment of the standard VIN code plate angle. It can accurately control the standard VIN code plate to swing within the set angle range to simulate different shooting angle scenarios. The angle detection device is installed on the back of the clamping turntable, which can directly detect the rotation angle of the clamping turntable, thereby obtaining the actual angle of the standard VIN code plate, and providing real-time feedback of angle parameters to achieve precise monitoring and adjustment of the angle, ensuring the accuracy of angle variable simulation.

[0052] like Figure 5 As shown, in some other embodiments of this utility model, the light generating device includes an upper LED light plate 481 and a lower LED light plate 482 installed at a distance from the rear wall of the reference plate 20. The upper LED light plate 481 is located above the shooting window 21, and the lower LED light plate 482 is located below the shooting window 21. The light intensity detection device 49 is installed on the support frame 43, and the light intensity detection device 49 is located behind and above the clamping turntable 42. The beneficial effects of adopting the above technical solution are as follows: The upper LED light board and the lower LED light board are located above and below the shooting window, respectively, which can uniformly illuminate the standard VIN code board from both sides, avoiding uneven illumination on the surface of the standard VIN code board caused by unilateral illumination, ensuring the realism of the lighting environment simulation, and more closely resembling the lighting conditions in the actual shooting scene; The light intensity detection device is installed on the support frame and located high behind the clamping turntable, which can detect the light intensity around the standard VIN code board in real time without obstructing the standard VIN code board, thus avoiding interference with the acquisition instrument's shooting; At the same time, the detection position is close to the standard VIN code board, resulting in more accurate detection data and real-time feedback of light intensity parameters, which facilitates the adjustment of the LED light board brightness according to the testing requirements, achieving precise control of light intensity.

[0053] like Figure 1-3 As shown, in some other embodiments of this utility model, the front of the housing 10 is provided with an openable and closable main door 13, and the left or right side of the housing 10 is provided with an openable and closable auxiliary door 14; an operation port 15 is provided on the left and right side walls of the housing 10 near the main door, and a flexible light-shielding sleeve 151 extending inward is connected to the operation port 15. The beneficial effects of adopting the above technical solution are: the main door facilitates the operator to place or take out the instrument to be tested, the auxiliary door facilitates the inspection, maintenance or replacement of the standard VIN code plate of the components in the standard plate adjustment area, improving the convenience of use and maintenance of the device; the operation ports on the left and right side walls allow the operator to reach into the housing to operate the instrument, and the flexible light-shielding sleeve can fit tightly against the operator's hand when the hand is reached in, effectively blocking external light from entering the housing from the operation port, avoiding interference from external light on the lighting environment inside the housing, ensuring the accuracy of the light intensity simulation, and ensuring the reliability of the test results.

[0054] like Figure 1-3As shown, in some other embodiments of this utility model, a power module 50 for power supply is provided in the standard plate adjustment area 12; a touch screen display 16 is also provided on the outside of the housing 10, and a controller is also included, which is signal-connected to the touch screen display 16 and the standard plate adjustment assembly 40. The beneficial effects of adopting the above technical solution are: the power module provides stable power supply to the motor, LED light board, sensors and other components in the standard plate adjustment assembly, improving the portability of the device and facilitating on-site testing; the touch screen display works in conjunction with the controller, allowing operators to input test parameters (such as distance, angle, and light intensity) through the touch screen display, and the controller controls the standard plate adjustment assembly to perform corresponding actions after receiving the instructions. At the same time, the controller can receive data from each sensor and display it on the touch screen display in real time, making it easy for operators to intuitively understand the various variable parameters during the test process, realizing visualized operation and monitoring of the test process, and improving the ease of operation and intelligence of the device.

[0055] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A test device for testing the character recognition rate of a vehicle identification number image acquisition instrument, characterized in that, include: Box; A distance reference plate is vertically installed in the middle of the housing. The distance reference plate divides the internal space of the housing into a data acquisition instrument placement area and a standard plate adjustment area. The distance reference plate is provided with a shooting window that runs through the front and back. A data acquisition device fixing assembly is used to fix the data acquisition device being tested, and the data acquisition device fixing assembly is located in the data acquisition device placement area; A standard plate adjustment assembly, located in the standard plate adjustment area, includes a standard VIN code plate, a clamping turntable, a support frame, a rotation drive mechanism, an angle detection device, a translation drive mechanism, a displacement detection device, a light generation device, and a light intensity detection device. The standard VIN code plate is disposed on the clamping turntable, which is rotatably mounted on the support frame. The rotation drive mechanism drives the clamping turntable and the standard VIN code plate to swing relative to the support frame within a set angle range. The angle detection device detects the swing angle of the standard VIN code plate relative to the support frame. The translation drive mechanism drives the support frame and the standard VIN code plate to translate relative to a distance reference plate. The displacement detection device detects the distance between the standard VIN code plate and the distance reference plate. The light generation device generates light within the standard plate adjustment area. The light intensity detection device detects the light intensity at the position of the standard VIN code plate.

2. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 1, characterized in that, The data acquisition device fixing assembly includes a fixed support plate, a vertical slide rail, a lifting drive mechanism, and a clamping mechanism. The vertical slide rail is fixed to the front side of the distance reference plate. The fixed support plate is mounted on the slider of the vertical slide rail. The data acquisition device to be detected is placed on the fixed support plate. The clamping mechanism is mounted on the fixed support plate and clamps the data acquisition device to be detected from the left and right sides. The lifting drive mechanism is used to drive the fixed support plate to move up and down along the vertical slide rail.

3. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 2, characterized in that, The lifting drive mechanism includes a first handwheel, a lead screw, a nut seat, a first connecting rod, and a second connecting rod. A first hinge seat, a first bearing seat, and a second bearing seat are fixedly installed on the bottom plate of the housing located at the front side of the reference plate. A first connecting frame is fixedly installed on the left end of the bottom surface of the fixed support plate, and a second connecting frame is fixedly installed on the right end of the bottom surface of the fixed support plate. The two ends of the lead screw are rotatably mounted on the first bearing seat and the second bearing seat respectively via bearings. The first handwheel is drivenly connected to the end of the lead screw. The nut seat is threaded onto the lead screw. The middle positions of the first connecting rod and the second connecting rod are hinged together. The lower end of the first connecting rod is hinged to the nut seat, and the upper end of the first connecting rod is hinged to the first connecting frame. The second connecting frame has a horizontal elongated groove. The lower end of the second connecting rod is hinged to the first hinge seat, and the upper end of the second connecting rod is rotatably connected to the groove of the second connecting frame via a rotating shaft and can move left and right along the groove.

4. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 2, characterized in that, The clamping mechanism includes a left support, a right support, a guide rod, a bidirectional threaded screw, a left moving block, a left clamping plate, a right moving block, a right clamping plate, and a second handwheel. The left support is fixed to the left end of the upper surface of the fixed support plate, and the right support is fixed to the right end of the upper surface of the fixed support plate. The two ends of the guide rod are respectively connected to the left and right supports. The two ends of the bidirectional threaded screw are rotatably mounted on the left and right supports, respectively. The left and right halves of the bidirectional threaded screw have threaded sections with opposite directions of rotation. The left moving block passes through the guide rod and is connected to the threaded section of the left half of the bidirectional threaded screw. The left clamping plate is fixedly connected to the left moving block. The right moving block passes through the guide rod and is connected to the threaded section of the right half of the bidirectional threaded screw. The right clamping plate is fixedly connected to the right moving block. The second handwheel is drivenly connected to the end of the bidirectional threaded screw.

5. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 4, characterized in that, The fixed support plate is also provided with a support sub-plate whose vertical position is adjustable. The support sub-plate has an elongated hole in the vertical direction, and the support sub-plate is connected to the fixed support plate by bolts passing through the elongated hole.

6. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 1, characterized in that, The translation drive mechanism includes a first motor, a guide rail slide, a transmission screw, and a slider. The length direction of the guide rail slide is perpendicular to the plane of the distance reference plate. The transmission screw is arranged parallel to the guide rail slide. The first motor drives the transmission screw to rotate via a transmission mechanism. The slider is movably mounted on the guide rail slide. A nut is threaded onto the transmission screw and fixedly connected to the slider. The support frame is fixedly connected above the slider. The displacement detection device is a grating ruler arranged parallel to the guide rail slide, and the reading head of the grating ruler is fixedly connected to the support frame.

7. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 6, characterized in that, The rotary drive mechanism includes a second motor, a driving wheel, a driven wheel, a transmission belt, and a rotating rod. The base of the second motor is fixedly connected to the support frame. The driving wheel is fixedly connected to the output shaft of the second motor. The driven wheel is fixedly connected to the end of the rotating rod. The transmission belt connects the driving wheel and the driven wheel. The rotating rod is rotatably mounted on the support frame. The rear side of the clamping turntable is fixedly connected to the rotating rod. The angle detection device is fixedly mounted on the back of the clamping turntable.

8. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 1, characterized in that, The light-generating device includes an upper LED light board and a lower LED light board mounted on the rear wall of the distance reference plate. The upper LED light board is located above the shooting window, and the lower LED light board is located below the shooting window. The light intensity detection device is mounted on the support frame and is located behind and above the clamping turntable.

9. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 1, characterized in that, The front of the container is provided with a main door that can be opened and closed, and the left or right side of the container is provided with a secondary door that can be opened and closed; an operating port is provided on the left and right side walls of the container near the main door, and a flexible light-shielding sleeve extending inward is connected to the operating port.

10. The vehicle identification number image acquisition instrument character recognition rate testing device according to claim 1, characterized in that, The standard board adjustment area is equipped with a power supply module for power supply.

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