Device for detecting reflection coefficient of label by using exposure of photographic method

Abstract

The invention provides a device for detecting the light reflection coefficient of a sign by using the exposure degree of a photography method, the device comprises a driving assembly, a dynamic calibration assembly, a rear bearing assembly, a connecting assembly and a photography method detection assembly, and the driving assembly comprises a driving vehicle body, a hidden groove, a sealing seat and an air bag type sealing ring. Compared with the prior art, the method has the following beneficial effects that the driving assembly, the dynamic calibration assembly and the photographing method detection assembly are arranged, the dynamic calibration plate is photographed through the camera before label detection, and the exposure value of the camera in the current environment is determined through the clear reflection coefficient value of the dynamic calibration plate; a driving assembly, a rear bearing assembly and a connecting assembly are arranged, the rear bearing assembly and the driving assembly are of a detachable structure, primary connection of a main lock catch and an auxiliary lock catch is achieved, reinforced connection is achieved through the connecting assembly, and therefore the light reflection coefficient of the to-be-detected sign can be determined through the camera shooting method, and detection of the light reflection coefficient of the sign can be facilitated. And the rear bearing assembly can be conveniently disassembled and assembled for use.

Description

Technical Field

[0001] This invention belongs to the field of sign reflectivity detection technology, and specifically relates to a device for detecting the reflectivity of signs using photographic exposure. Background Technology

[0002] Signage is a visual medium for conveying information (identification, instruction, warning, advertising, etc.). Through a combination of text, graphics, color, or reflective materials, it achieves its information transmission function in specific scenarios. Widely present in modern society, it covers transportation (road signs, prohibitory signs), public facilities (scenic area guide signs, venue signage), business parks (building number signs, safety warning signs), and commercial venues (shop signs, product nameplates), providing great convenience to people. The reflectivity coefficient is a key indicator for measuring the reflectivity of reflective signs (such as traffic signs and nighttime warning signs). Under a specific light source, the ratio of reflected light intensity to incident light intensity directly affects the recognition distance and clarity at night or in low-visibility environments. Currently, the main technology for testing the reflectivity of signs in my country is to use a retroreflectivity tester to measure the retroreflectivity coefficient of the sign panel at close range. The drawbacks of this method are that it requires close-range testing, multiple testing points on a single sign, slow testing efficiency, and the need for elevated vehicles to cordon off areas on operating roads.

[0003] In summary, we hope to propose a new structure to solve the aforementioned technical problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a device for detecting the reflectivity of signs using photographic exposure, thereby solving the problems mentioned in the background art.

[0005] This invention is achieved through the following technical solution: a device for detecting the reflectivity of signs using photographic exposure, comprising: the driving component, dynamic calibration component, rear support component, connecting component, and photographic detection component, wherein the driving component includes a driving vehicle body, a hidden groove, a sealing seat, and an airbag-type sealing ring; The rear end of the upper surface of the vehicle body is provided with a hidden groove for hiding and placing the dynamic calibration component. A sealing seat is fixedly connected to the upper surface of the vehicle body around the hidden groove. An airbag-type sealing ring is provided inside the sealing seat. A dynamic calibration component for dynamic calibration before sign detection is installed inside the hidden groove. The dynamic calibration component includes a dynamic calibration plate. A rear support component is installed behind the driving component. The rear support component includes a support for the rear bucket and a placement slot. The upper surface of the support for the rear bucket has a placement slot. A photographic detection component is installed at the rear end of the inner side of the placement slot. The photographic inspection assembly includes a mounting frame, a camera, and a lighting unit. The lower front end of the inner side of the mounting frame is equipped with a camera for detecting the reflectivity of the sign through camera exposure. The upper inner side of the mounting frame is equipped with a lighting unit. The rear end of the vehicle body is also equipped with a connecting component. The top of the vehicle body is pre-installed with a light intensity sensor for monitoring the current ambient light intensity. Before the sign inspection, the lighting unit illuminates the dynamic calibration plate, and the camera exposes and captures the image to achieve the current environment calibration. The light intensity sensor also detects fluctuations in other ambient light, eliminating the influence of other light sources during the inspection process.

[0006] In a preferred embodiment, a set of lifting racks for assisting the dynamic calibration component to move up and down are fixedly connected to both the left and right ends of the inner side of the hidden groove, and a set of lifting guide rods are fixedly connected to the four corners of the inner side of the hidden groove. The dynamic calibration component also includes a set of lifting seats. A set of lifting guide holes are formed vertically through the four corners of the upper surface of the lifting seats. Linear bearings are fitted inside the lifting guide holes. The lifting guide rod passes through the linear bearings. A set of lifting gears is provided on the inner side of both the left and right ends of the lifting seats in a rotating structure. A rotating shaft is connected through the center of the lifting gear. A synchronous pulley is sleeved on the outer side of the front end of the rotating shaft. A synchronous belt is sleeved on the outer side of the synchronous pulley. The synchronous belt has a double-tooth structure and meshes with the synchronous pulley. A lifting motor is provided in the middle of the inner side of the lifting seat, and a set of synchronous pulleys is also sleeved on the outer side of the motor shaft. The synchronous belt engages with the idler pulley on the other side to achieve reverse power transmission. The lifting gear meshes with the lifting rack, and the lifting motor synchronously drives the left and right sets of lifting gears to rotate. The meshing of the lifting gear and the lifting rack achieves the lifting control of the dynamic calibration component. Before calibration is required, the dynamic calibration component is moved upward out of the hidden slot, so that the detection calibration auxiliary work can be completed through the dynamic calibration plate.

[0007] In a preferred embodiment, a set of sealing air columns are movably fitted into the inner sides of both the left and right ends of the lifting seat. The lower end of the sealing air column is fixedly connected to the lower end of the hidden groove. A set of sealing plungers is movably fitted into the inner side of the sealing air column in a sealing structure. A sealing push seat is fixedly connected above the sealing plungers. A set of return springs is sleeved on the outer side of the sealing push seat. A set of sealing gas ducts is provided on the lifting seat behind the left sealing gas column and in front of the right sealing gas column. A set of sealing gas guide holes is opened between the two sets of sealing gas columns and the two sets of sealing gas ducts respectively. The lower section of the sealing gas duct is a metal corrugated pipe. The upper end of the sealing gas duct is connected to the airbag-type sealing ring. A set of duct hiding grooves are provided on the left rear end and right front end of the inner side of the hiding groove. The upper and lower ends of the inner side of the duct hiding groove are both rotating structures with a set of directional pulleys. The sealing gas duct is sleeved to the outside of the directional pulleys.

[0008] As a preferred embodiment, a support column is fixedly connected to each of the four corners above the lifting seat, a hidden seat is fixedly connected above the support column, a calibration plate placement groove is provided on the rear side of the hidden seat, and a set of sliding grooves are provided on the inner sides of both the left and right ends of the calibration plate placement groove. A limiting groove is provided at one end of the slide away from the center of the hidden seat. The length of the limiting groove is less than one centimeter of the slide. A slide seat is movably fitted inside the slide. A rotary torsion spring is provided at one end of the slide seat near the center of the hidden seat. The dynamic calibration plate is located between the two sets of rotary torsion springs and is arranged in a rotating structure. The dynamic calibration plate is set in a vertical structure after sliding out of the calibration plate placement slot area under the action of the rotation torsion spring. A sealing plate is provided above the hidden seat, and a sealing groove is opened on the lower surface of the sealing plate. The sealing seat is a conical inclined structure with the outer end sunken and is interlocked with the sealing groove. A set of sealing ring grooves is also provided above the sealing groove, and the sealing ring grooves are sealed and fitted with the expanded airbag-type sealing ring.

[0009] When the dynamic calibration component moves downward and is positioned in the hidden groove, the hidden seat drives the sealing push seat to move downward, which in turn drives the sealing plunger to move within the sealing air column. This compresses the internal air and guides it through the sealing air guide hole and sealing air guide tube, causing the air to be introduced into the airbag-type sealing ring to expand and complete the sealing fit between the airbag-type sealing ring and the sealing ring groove. The sealing plate then seals the opening of the hidden groove at the upper end.

[0010] As a preferred embodiment, the photographic detection assembly further includes a detection base, with a set of shock-absorbing seats fixedly connected to each of the four corners of the detection base, and a set of adjustment grooves opened at both the left and right ends of the upper surface of the detection base. An adjusting slide block is movably fitted inside the adjusting slide groove. An abutting slide groove is provided on the upper surface of the adjusting slide block at one end away from the center of the detection base. A set of abutting screws is rotatably connected inside the abutting slide groove. A set of abutting seats is also movably fitted inside the abutting slide groove. The abutment seat is also threaded with the abutment screw. Both the front and rear ends of the abutment seat are fixedly connected with abutment pressure seats. The upper surface of the detection base is provided with a set of abutment through grooves at both the front and rear ends of the adjustment slide groove. The lower end of the abutment pressure seat is embedded in the abutment through groove to achieve positioning after adjustment. The detection base is provided with a set of screw jacks in the middle. The screw jacks are vertical structures with a set of lifting screws in the middle. A set of upper bearings is provided above the lifting screws. A set of slow-release grooves are provided on the left and right ends of the lower surface of the upper bearings and on the upper surface of the adjusting slide. A set of slow-release rotating seats is rotatably connected to the inner side of the slow-release rotating slot. A set of spring damping shock absorbers is fixedly connected between the upper and lower sets of slow-release rotating seats. The upper support and the mounting frame are connected by a rotating structure. The mounting frame is rotated by an angle adjustment motor. The angle adjustment motor is a geared motor with a built-in angle encoder and motor drive module.

[0011] During use, the screw jack drives the lifting screw to rotate according to the actual shooting position, and controls the lifting and adjusting of the upper bearing seat. During the adjustment process, the adjusting slide slides along the adjusting groove. After the adjustment is completed, the abutment screw is manually rotated to move the abutment pressure seat down, so that the lower end of the abutment pressure seat is inserted into the abutment through groove to achieve engagement and fixation. The position of the adjusting slide is adjusted and fixed. Both the left and right ends of the upper bearing seat are supported by a set of spring damping shock absorbers to improve the stability of the upper bearing seat during use.

[0012] In a preferred embodiment, a connecting frame is fixedly connected to the front side of the supporting rear bucket, a cross is fixedly connected to the middle position of the connecting frame, and a set of secondary locks are fixedly connected to the front ends of both the left and right sides of the supporting rear bucket. A set of main latches is fixedly connected to the rear ends of both the left and right sides of the vehicle body. The main latches and the auxiliary latches are used together to realize the initial connection between the driving component and the rear support component. A connecting groove is opened at the lower end of the rear side of the vehicle body, and a cross groove is opened forward in the middle of the connecting groove. A set of connecting positioning holes is provided on the four inner sides of the cross groove and the four outer sides of the cross. The connecting frame and the connecting groove are interlocked. The cross and the cross groove are interlocked. A set of wheel grooves is also provided on the rear side of the vehicle body. A positioning tooth groove is provided on the front side of the wheel groove. The inner side of the wheel groove is provided with a wire hole facing directly downwards. The upper inner side of the wire hole is provided with a number of rolling balls in a movable fitting structure. The wire hole is opened towards the front end of the cross groove.

[0013] In a preferred embodiment, the connecting assembly includes a take-up reel, a handwheel is fixedly connected to the rear side of the take-up reel, a connecting pull rope is wound around the outer side of the take-up reel, and the connecting pull rope is threaded inside the wire hole and has a steering roller in a rotating structure at the bend. The winding reel is provided with a tension column on the front side, and a return spring is sleeved on the outside of the tension column. A pull seat is fixedly connected to the front side of the tension column. The pull seat has a square structure and a rotating seat is sleeved on the outside. The rotating seat is rotatably set in front of the positioning tooth groove. A set of pull seats is fixedly connected to the lower end of the connecting pull rope. The outer side of the pull seat has four sets of pull rods that are evenly distributed in a circle. The other end of the pull rod is also connected to a set of positioning claws in a rotating structure. A connecting positioning post is fixedly connected to the rear end of the positioning claws. The front end of the positioning claw is rotatably connected to a claw seat, and a return spring is provided between the claw seat and the pull seat. The connecting positioning post and the connecting positioning hole are fitted together. A set of positioning tooth seats is also fixedly connected to the front side of the winding wheel, and the positioning tooth seats and the positioning tooth grooves are fitted together.

[0014] As a preferred embodiment, the lower surface of the connecting frame is provided with a support leg groove. Both the left and right ends of the inner side of the support leg groove are rotatably connected to a set of support legs via a second rotary torsion spring. The two sets of support legs are hidden inside the support leg groove due to the rotational action of the second rotary torsion spring. Both sets of support legs are connected to a set of support leg studs on the inner side with a threaded structure. The end of the support leg stud away from the support leg is fixedly connected to a support leg base. When the two sets of support legs are arranged in a horizontal structure, a support groove is opened on the upper side. A support slide is movably fitted inside the support groove. The inner side of the support slide is rotatably connected to a rotating seat, and the outer side of the rotating seat is fixedly connected to a support rod. The two sets of support rods are threadedly connected to a support stud. The support slide groove is recessed at one end near the center of the connecting frame and has a retaining groove. After the support slide groove slides to the other end of the support slide groove, it engages with the retaining groove.

[0015] The rear support assembly and the driving assembly are detachable structures. They are initially connected via the main latch and the auxiliary latch, and the winding wheel is rotated to wind up the connecting rope. This causes the four sets of positioning claws to rotate, so that the connecting positioning pins at their ends are embedded in the connecting positioning holes to achieve a reinforced connection.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: By setting up a driving component, a dynamic calibration component, and a photographic detection component, a camera photographs the dynamic calibration board before the sign is detected. The dynamic calibration board has a clear reflectance value. Before shooting, the camera adjusts fixed parameters such as ISO (5000), shutter speed (1 / 500s), and white balance. The camera takes a photo in the current environment to determine the proportional coefficient K value. In the subsequent detection of the reflectance of the sign to be tested, the camera takes a photo and converts it to determine the reflectance. The dynamic calibration board is recalibrated after the ambient light intensity fluctuates greatly, which facilitates the detection of the sign's reflectance.

[0017] By setting up a driving component, a rear support component, and a connecting component, the rear support component and the driving component are detachable structures. First, a preliminary connection is achieved through the main lock and the auxiliary lock. Then, the winding wheel is rotated to wind up the connecting rope, which in turn causes the four sets of positioning claws to rotate, so that the connecting positioning pins at their ends are embedded in the connecting positioning holes to achieve a reinforced connection. This makes it easy to assemble and disassemble the rear support component. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0020] Figure 2 This is a schematic diagram of the driving component in a device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0021] Figure 3 This is a schematic diagram of the upper structure of the dynamic calibration component in the device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0022] Figure 4 This is a partial structural diagram of the dynamic calibration component removing the dynamic calibration plate in the device for detecting the reflectivity of a sign using photographic exposure according to the present invention.

[0023] Figure 5 This is a schematic diagram of the lower structure of the dynamic calibration component in the device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0024] Figure 6 for Figure 4 A partial sectional view.

[0025] Figure 7 for Figure 4 A partial sectional view.

[0026] Figure 8 This is a schematic diagram of the upper structure of the rear support component in a device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0027] Figure 9 This is a schematic diagram of the lower structure of the rear support component in a device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0028] Figure 10 This is a schematic diagram of the upper structure of the support leg in a device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0029] Figure 11 This is a schematic diagram of the rear structure of the connecting component in a device for detecting the reflectivity of a sign using photographic exposure according to the present invention.

[0030] Figure 12 This is a schematic diagram of the front structure of the connecting component in a device for detecting the reflectivity of a sign using photographic exposure according to the present invention.

[0031] Figure 13 This is a partial cross-sectional schematic diagram of the connecting components in the device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0032] Figure 14 This is a schematic diagram of the photographic detection component in the device for detecting the reflectivity of signs using photographic exposure according to the present invention.

[0033] In the diagram, 100-driving component, 101-driving vehicle body, 102-hidden groove, 103-lifting rack, 104-lifting guide rod, 105-sealing seat, 106-airbag-type sealing ring, 107-directional pulley, 108-wheel groove, 109-positioning groove, 110-wire hole, 111-ball, 112-connecting groove, 113-cross groove, 114-connecting positioning hole, 115-main lock latch; Dynamic calibration component, 201-lifting seat, 202-lifting guide hole, 203-linear bearing, 204-lifting gear, 205-synchronous pulley, 206-sealing air column, 207-sealing plunger, 208-sealing push seat, 209-reset spring, 210-sealing air guide hole, 211-sealing air duct, 212-metal bellows, 213-hidden seat, 214-calibration plate placement slot, 215-sliding groove, 216-limiting groove, 217-sliding seat, 218-rotation torsion spring I, 219-dynamic calibration plate, 220-sealing plate, 221-sealing groove, 222-sealing ring groove; Rear support assembly, 301-supporting rear bucket, 302-placement slot, 303-secondary lock, 304-connecting frame, 305-cross, 306-leg slot, 307-leg, 308-leg stud, 309-leg base, 310-support slide, 311-support slide, 312-support rod, 313-support stud, 314-holding slot; Connecting assembly, 401-rewinding wheel, 402-connecting pull rope, 403-handwheel, 404-rotating seat, 405-pull seat, 406-tensioning column, 407-return spring, 408-positioning tooth seat, 409-directing roller, 410-pull seat, 411-pull rod, 412-positioning claw, 413-connecting positioning column, 414-claw seat; 500-Photographic testing component, 501-Testing base, 502-Shock absorber, 503-Adjusting slide, 504-Abutting through slot, 505-Adjusting slide, 506-Abutting slide, 507-Abutting screw, 508-Abutting pressure seat, 509-Spring damping shock absorber, 510-Slow-release rotating seat, 511-Screw jack, 512-Lifting screw, 513-Upper bearing seat, 514-Mounting bracket, 515-Camera, 516-Lighting lamp. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-14 The present invention provides a technical solution: a device for detecting the reflectivity of signs using photographic exposure, comprising: a driving component 100, a dynamic calibration component 200, a rear support component 300, a connecting component 400, and a photographic detection component 500. The driving component 100 includes a driving vehicle body 101, a hidden groove 102, a sealing seat 105, and an airbag-type sealing ring 106. The rear end of the upper surface of the vehicle body 101 is provided with a hidden groove 102 for hiding and placing the dynamic calibration component 200. A sealing seat 105 is fixedly connected to the upper surface of the vehicle body 101 around the hidden groove 102. An airbag-type sealing ring 106 is provided inside the sealing seat 105. The dynamic calibration component 200 for dynamic calibration before sign detection is installed inside the hidden groove 102. The dynamic calibration component 200 includes a dynamic calibration plate 219. A rear support component 300 is installed behind the driving component 100. The rear support component 300 includes a support for the rear bucket 301 and a placement slot 302. The upper surface of the support for the rear bucket 301 is provided with a placement slot 302. A photographic detection component 500 is installed at the rear end of the inner side of the placement slot 302. The photographic inspection component 500 includes a mounting bracket 514, a camera 515, and a lighting lamp 516. The lower front end of the inner side of the mounting bracket 514 is equipped with a camera 515 for detecting the reflectivity of the sign through camera exposure. The upper inner side of the mounting bracket 514 is equipped with a lighting lamp 516. The rear end of the inner side of the vehicle body 101 is also equipped with a connecting component 400. The top of the vehicle body 101 is pre-installed with a light intensity sensor for monitoring the current ambient light intensity. Before the sign inspection operation, the light intensity sensor illuminates the dynamic calibration plate 219 through the lighting lamp 516 and is exposed and photographed by the camera 515 to achieve the detection and calibration of the current environment. The light intensity sensor sends the ambient light intensity data to the detection and analysis system through wired transmission. The system automatically eliminates ambient light interference items by combining the data captured by the camera.

[0036] Please see Figures 1-8 and Figure 14 Example 1: A set of lifting racks 103 for assisting the lifting and moving of the dynamic calibration component 200 is fixedly connected to both the left and right ends of the inner side of the hidden groove 102, and a set of lifting guide rods 104 are fixedly connected to the four corners of the inner side of the hidden groove 102. The dynamic calibration component 200 also includes a set of lifting seats 201. A set of lifting guide holes 202 are formed vertically through the four corners of the upper surface of the lifting seat 201. A linear bearing 203 is fitted inside the lifting guide hole 202. A lifting guide rod 104 is set through the linear bearing 203. A set of lifting gears 204 are provided on the inner side of both the left and right ends of the lifting seat 201 in a rotating structure. A rotating shaft is connected through the center of the lifting gear 204. A synchronous pulley 205 is sleeved on the outer side of the front end of the rotating shaft. A synchronous belt is sleeved on the outer side of the synchronous pulley 205. The synchronous belt has a double-tooth structure and meshes with the synchronous pulley 205. A lifting motor is provided in the middle of the inner side of the lifting seat 201, and a set of synchronous pulleys 205 is also sleeved on the outer side of the motor shaft. The synchronous belt engages with the idler pulley on the other side. The synchronous pulley 205 at the other end is used to transmit power in the opposite direction. The lifting gear 204 meshes with the lifting rack 103. The lifting motor drives the left and right sets of lifting gears 204 to rotate synchronously. The lifting gear 204 and the lifting rack 103 mesh together to control the lifting of the dynamic calibration component 200. Before calibration is required, the dynamic calibration component 200 is moved upward out of the hidden slot 102 so that the dynamic calibration plate 219 can complete the auxiliary work of detection and calibration.

[0037] A set of sealing air columns 206 are movably fitted into the inner sides of both ends of the lifting seat 201. The lower end of the sealing air column 206 is fixedly connected to the lower end of the hidden groove 102. A set of sealing plungers 207 are movably fitted into the inner side of the sealing air column 206 in a sealing structure. A sealing push seat 208 is fixedly connected above the sealing plungers 207. A set of return springs 209 are sleeved on the outside of the sealing push seat 208. The lifting seat 201 is provided with a set of sealing gas ducts 211 behind the left sealing gas column 206 and in front of the right sealing gas column 206. A set of sealing gas guide holes 210 are respectively opened between the two sets of sealing gas columns 206 and the two sets of sealing gas ducts 211. The lower section of the sealing gas duct 211 is a metal bellows 212. The upper end of the sealing gas duct 211 is connected to the airbag-type sealing ring 106. A set of duct hiding grooves is provided on the left rear end and right front end of the inner side of the hiding groove 102. The upper and lower ends of the inner side of the duct hiding groove are both rotating structures with a set of reversing pulleys 107. The sealing gas duct 211 is sleeved to the outside of the reversing pulleys 107.

[0038] The four corners of the lifting seat 201 are fixedly connected to the support columns, and the hidden seat 213 is fixedly connected above the support columns. The rear side of the hidden seat 213 has a calibration plate placement groove 214, and the inner sides of the left and right ends of the calibration plate placement groove 214 have a set of sliding grooves 215. A limiting groove 216 is provided at the end of the slide 215 away from the center of the hidden seat 213. The length of the limiting groove 216 is less than one centimeter of the slide 215. A slide seat 217 is movably fitted inside the slide 215. A rotary torsion spring 218 is provided at the end of the slide seat 217 near the center of the hidden seat 213. The dynamic calibration plate 219 is located between the two sets of rotary torsion springs 218 and is arranged in a rotating structure. Under the action of the rotary torsion spring 218, the dynamic calibration plate 219 is set in a vertical structure after sliding out of the calibration plate placement slot 214 area. A sealing plate 220 is provided above the hidden seat 213. A sealing groove 221 is opened on the lower surface of the sealing plate 220. The sealing seat 105 is a tapered inclined structure with the outer end sunken and is interlocked with the sealing groove 221. A set of sealing ring grooves 222 is also provided above the sealing groove 221, and the sealing ring grooves 222 are sealed and fitted with the expanded airbag-type sealing ring 106.

[0039] When the dynamic calibration component 200 moves downward and is positioned within the hidden groove 102, the hidden seat 213 drives the sealing push seat 208 to move downward, which in turn drives the sealing plunger 207 to move within the sealing air column 206. This compresses the internal air and guides it through the sealing air guide hole 210 and the sealing air guide tube 211, causing the air to be introduced into the airbag-type sealing ring 106 and expand it. This completes the sealing fit between the airbag-type sealing ring 106 and the sealing ring groove 222, and the sealing plate 220 seals and blocks the opening of the hidden groove 102 at the upper end.

[0040] The photographic inspection component 500 also includes a set of inspection bases 501. A set of shock-absorbing seats 502 are fixedly connected to the four corners of the inspection base 501. An adjustment groove 503 is opened on both the left and right ends of the upper surface of the inspection base 501. An adjusting slide block 505 is movably fitted inside the adjusting slide 503. An abutting slide 506 is provided at one end of the upper surface of the adjusting slide block 505 away from the center of the detection base 501. A set of abutting screws 507 are rotatably connected inside the abutting slide 506. A set of abutting seats is also movably fitted inside the abutting slide 506. The abutment seat is also threaded with the abutment screw 507. Abutment pressure seats 508 are fixedly connected to both the front and rear ends of the abutment seat. A set of abutment through grooves 504 are opened at both the front and rear ends of the upper surface of the detection base 501 located in the adjustment slide groove 503. The lower end of the abutment pressure seat 508 is embedded in the abutment through groove 504 to achieve positioning after adjustment. A set of screw jacks 511 is provided in the middle of the detection base 501. The screw jacks 511 have a vertical structure with a set of lifting screws 512 in the middle. A set of upper bearings 513 is provided above the lifting screws 512. A set of slow-release grooves are provided on the left and right ends of the lower surface of the upper bearings 513 and on the upper surface of the adjusting slide 505. A set of slow-release rotating seats 510 is rotatably connected to the inner side of the slow-release rotating slot. A set of spring damping shock absorbers 509 is fixedly connected between the upper and lower sets of slow-release rotating seats 510. The upper bearing 513 and the mounting frame 514 are connected by a rotating structure. The mounting frame 514 is rotated by an angle adjustment motor. The angle adjustment motor is a geared motor with a built-in angle encoder and motor drive module.

[0041] The angle adjustment motors are all integrated geared motors. Their built-in angle encoders, motor drive modules, and motor bodies work together using a modular hard connection + signal interaction method. The specific connection relationship is as follows: Power Supply Connection: The two built-in modules share the same power supply circuit (rated operating voltage 12~24V). The power supply line is led out through the internal terminals of the motor and stably connected to an external DC power supply to ensure synchronous start-stop and continuous operation of the modules; Signal Transmission Connection: The signal output terminal of the wireless receiver module is directly connected to the signal input terminal of the motor drive module through the SPI communication bus to transmit external commands to the drive core without delay; The signal output terminal of the angle encoder is connected to the feedback signal input terminal of the motor drive module through a differential signal line to transmit accurate data of the motor rotation angle in real time (resolution ≤0.1°); The power output terminal of the motor drive module is connected to the motor winding coil to control the speed and direction of the motor rotor through PWM (pulse width modulation) signal; Mechanical Connection: The encoder shaft of the angle encoder is coaxially fixed with the motor output shaft to ensure that the motor rotation angle is completely synchronized with the encoder acquisition angle, with no transmission error; The motor drive module is fixed to the motor housing through a built-in mounting base, which has anti-vibration and anti-loosening characteristics and is suitable for dynamic working conditions during the calibration process.

[0042] The control process revolves around "host computer commands → module collaborative processing → precise motor action → angle closed-loop feedback," enabling automated and high-precision adjustment of the 513 angle of the mounting bracket. The specific steps are as follows: Command Initiation Phase: The operator presets an angle list via the host computer; Command Reception and Parsing Phase: The command is decoded and verified (interference signals are eliminated), the target angle parameters are extracted, and the parsed digital command signal is transmitted to the motor drive module via the SPI bus, simultaneously triggering the drive module to wake up and enter the working state; Angle Comparison and Drive Signal Generation Phase: After receiving the target angle command, the motor drive module immediately calls the real-time acquisition data of the angle encoder (the encoder acquires ≥100 times per second to ensure dynamic tracking); The microcontroller built into the drive module calculates the difference between the "target angle" and the "real-time angle"; Motor Execution Phase: After receiving the PWM signal output by the drive module, the motor drives the mounting bracket to rotate, realizing the camera angle adjustment.

[0043] During use, the screw jack 511 drives the lifting screw 512 to rotate according to the actual shooting position, and controls the lifting adjustment of the upper bearing 513. During the adjustment process, the adjusting slide 505 slides along the adjusting groove 503. After the adjustment is completed, the abutment screw 507 is manually rotated to drive the abutment pressure seat 508 to move down, so that the lower end of the abutment pressure seat 508 is embedded into the abutment through groove 504 to achieve engagement and fixation. The position of the adjusting slide 505 is adjusted and fixed. Both ends of the upper bearing 513 are supported by a set of spring damping shock absorbers 509 to improve the stability of the upper bearing 513 during use.

[0044] Specifically, firstly, in the preparation stage before the reflectivity test of the sign, the driving component 100 is driven to the area to be tested. In the safe area, the driving component 100 is separated from the rear support component 300. The rear support component 300 is set in a fixed position. The driving component 100 is driven forward to a set distance and fixedly parked (the set distance is adjusted according to actual needs and is not specifically limited). The lifting motor rotates and transmits the rotational power to the left and right lifting gears 204 through the cooperation of the synchronous belt and the synchronous pulley 205. The lifting gears 204 rotate and mesh with the upgrading rack 103 to drive the lifting control of the dynamic calibration component 200. Secondly, during the lifting and lowering movement of the dynamic calibration component 200, the lifting guide rod 104 is installed through the linear bearing 203 to provide linear guidance for the lifting and lowering movement of the dynamic calibration component 200. When the hidden seat 213 moves upward and loses its position away from the area of ​​the hidden groove 102, the testing personnel manually pull the dynamic calibration plate 219 to the rear, and it slides linearly along the slide groove 215 via the slide seat 217. The rear end of the slide seat 217 is limited by the limiting groove 216. The dynamic calibration plate 219 completes the rotation from the horizontal structure to the vertical structure through the two sets of left and right rotary torsion springs 218, so that the dynamic calibration plate 219 is set in a vertical structure during operation. Then, the screw jack 511 is controlled to drive the lifting... The screw 512 rotates in both directions, controlling the upper bearing 513 to be raised and lowered to the set height. The angle adjustment motor drives the mounting bracket 514 to rotate in both directions, realizing the angular position of the camera 515 relative to the distant dynamic calibration plate 219. The light 516 shines on the dynamic calibration plate 219, and the camera 515 takes multiple photos of the dynamic calibration plate 219. Because the dynamic calibration plate 219 has a known reflectivity, the inspector inputs the corresponding data into the analysis software to obtain the proportional coefficient K. In the subsequent process of detecting the reflectivity of the sign to be tested, the reflectivity of the sign is calculated by converting the proportional coefficient K (the camera 515 takes pictures based on the same preset distance, and the reflectivity of the sign = proportional coefficient K × (image gray value - ambient light contribution gray value)). In addition, during the lifting and lowering adjustment of the upper bearing seat 513, the linkage adjustment slide 505 slides along the adjustment slide groove 503. After the upper bearing seat 513 is adjusted, the abutment screw 507 is manually rotated to rotate, so that the abutment screw 507 engages with the thread of the abutment seat, driving the two sets of abutment pressure seats 508 to move downward and embed their lower ends into the abutment through groove 504. The adjustment is fixed through the interlocking structure. The bottom of the photographic detection component 500 is stabilized by four sets of shock absorber seats 502. The upper bearing seat 513 is supported by a set of spring damping shock absorbers 509 on both the left and right sides to improve the stability of the upper bearing seat 513 in use. After the dynamic calibration component 200 is used, it is moved downwards and hidden inside the hidden groove 102. During the downward movement, the hidden seat 213 presses the sealing push seat 208 downwards and pushes the sealing plunger 207 downwards inside the sealing air column 206. This allows the internal air to be introduced into the airbag sealing ring 106 through the sealing air guide hole 210 and the sealing air guide tube 211. The airbag sealing ring 106 expands and seals with the sealing ring groove 222, achieving a high seal. After the dynamic calibration component 200 is moved downwards, the sealing plate 220 is attached to the upper end of the sealing seat 105, and the sealing groove 221 is fitted with the sealing seat 105 through a conical structure, preventing external debris from entering the hidden groove 102 during the sealing process. This facilitates the use of the sign reflectivity detection.

[0045] Please see Figures 1-2 and Figure 8-13 Example 2: A connecting frame 304 is fixedly connected to the front side of the supporting rear bucket 301, and a cross 305 is fixedly connected to the middle position of the connecting frame 304. A set of secondary locks 303 are fixedly connected to the front ends of both sides of the supporting rear bucket 301. A set of main latches 115 are fixedly connected to the rear ends of both sides of the driving vehicle body 101. The main latches 115 and the auxiliary latches 303 are used together to realize the initial connection between the driving component 100 and the rear support component 300. A connecting groove 112 is opened at the lower end of the rear side of the driving vehicle body 101. A cross groove 113 is opened forward in the middle of the connecting groove 112. A set of connecting positioning holes 114 are provided on the four inner sides of the cross groove 113 and the four outer sides of the cross 305. The connecting bracket 304 and the connecting groove 112 are fitted together, and the cross 305 and the cross groove 113 are fitted together. A set of wheel grooves 108 are also provided on the rear side of the vehicle body 101. A positioning tooth groove 109 is provided on the front side of the wheel groove 108. A wire hole 110 is provided on the inner side of the wheel groove 108 facing directly downward. Several sets of rolling balls 111 are provided on the upper inner side of the wire hole 110 in a movable fitting structure. The wire hole 110 is opened towards the front end of the cross groove 113.

[0046] The connecting assembly 400 includes a take-up reel 401, a handwheel 403 fixedly connected to the rear side of the take-up reel 401, a connecting pull rope 402 wound around the outer side of the take-up reel 401, and the connecting pull rope 402 is located inside the wire hole 110 and is provided with a steering roller 409 at the bend in a rotating structure. A tension column 406 is provided on the front side of the winding reel 401. A return spring 407 is sleeved on the outside of the tension column 406. A pull seat 405 is fixedly connected to the front side of the tension column 406. The pull seat 405 has a square structure and a rotating seat 404 is sleeved on the outside. The rotating seat 404 is located in front of the positioning tooth groove 109 and is rotatably set. A set of pull seats 410 is fixedly connected to the lower end of the connecting pull rope 402. The pull seats 410 have a rotating structure with four sets of pull rods 411 that are evenly distributed in a circle. The other end of the pull rods 411 also has a rotating structure and is connected to a set of positioning claws 412. A connecting positioning post 413 is fixedly connected to the rear end of the positioning claws 412. The front end of the positioning claw 412 is rotatably connected to the claw seat 414. A return spring is provided between the claw seat 414 and the pull seat 410. The connecting positioning post 413 and the connecting positioning hole 114 are engaged with each other. A set of positioning tooth seats 408 is also fixedly connected to the front side of the winding wheel 401. The positioning tooth seats 408 and the positioning tooth groove 109 are engaged with each other.

[0047] The lower surface of the connecting frame 304 is provided with a support leg groove 306. Both the left and right ends of the inner side of the support leg groove 306 are rotatably connected to a set of support legs 307 via a rotary torsion spring II. The two sets of support legs 307 are hidden inside the support leg groove 306 due to the rotational action of the rotary torsion spring II. Both sets of support legs 307 are threadedly connected to a set of support leg studs 308 on the inner side. The support leg studs 308 are fixedly connected to a support leg base 309 on the side away from the support legs 307. When the two sets of support legs 307 are set in a horizontal structure, a support groove 310 is opened on the upper side. A support slide 311 is movably fitted inside the support groove 310. A rotating seat is rotatably connected to the inner side of the support slide 311, and a support rod 312 is fixedly connected to the outer side of the rotating seat. A support stud 313 is threadedly connected between the two sets of support rods 312. A retaining groove 314 is provided at one end of the support slide 310 near the center of the connecting frame 304. After the support slide 311 slides to the other end of the support slide 310, it engages with the retaining groove 314.

[0048] The rear support assembly 300 and the driving assembly 100 are detachable structures. First, they are initially connected by the main lock 115 and the auxiliary lock 303. Then, the winding wheel 401 is rotated to wind up the connecting pull rope 402, which in turn causes the four sets of positioning claws 412 to rotate, so that the connecting positioning pins 413 at their ends are embedded in the connecting positioning holes 114 to achieve a reinforced connection.

[0049] Based on the first embodiment described above, the driving component 100 and the rear support component 300 are further designed as detachable structures. They are connected and docked by the connecting frame 304 being embedded in the connecting groove 112 and the cross 305 being embedded in the cross groove 113. Initial connection and fixation are achieved by the main lock 115 and the secondary lock 303. Then, the inspector pulls the handwheel 403 to the rear, causing the positioning tooth seat 408 to disengage from the positioning tooth groove 109. At this time, the rotating winding wheel 401 can be rotated to wind the connecting pull rope 402, causing the lower end of the connecting pull rope 402 to pull the pull seat 410 forward. The rotation of the pull rod 411 causes the four sets of positioning claws 412 to rotate synchronously, enabling the connecting positioning post 413 to pass through the two sets of connecting positioning holes 114, thereby achieving a reinforced connection to the rear support component 300. Secondly, during the winding and unwinding movement, the connecting rope 402 is located at the bend of the wire hole 110 and is assisted by the turning roller 409 to change direction. Several sets of rolling balls 111 prevent the connecting rope 402 from being scratched at the upper end of the wire hole 110. After the winding and unwinding adjustment is completed, the inspection personnel remove the applied outer side, and the return spring 407 drives the winding wheel 401 to move forward, so that the positioning tooth seat 408 is engaged with the positioning tooth groove 109 to achieve circumferential restriction. In addition, during the separate use of the driving component 100 and the rear support component 300, the outrigger 307 is set in a vertical structure by the rotation action of the rotary torsion spring II. The operator pulls the support rod 312 simultaneously, so that the support slide 311 slides along the support slide groove 310 to the lower end of the outrigger 307. Then, the support stud 313 is rotated to engage with the threaded connection of the support rod 312, so that the left and right sets of support slides 311 are embedded into the retaining groove 314 to achieve positioning and engagement, thus completing the vertical support of the left and right sets of outriggers 307. The outrigger stud 308 is manually rotated to make the outrigger base 309 fit against the ground to support the front end of the rear bucket 301, thereby facilitating the disassembly and assembly of the rear support component 300. Traditional methods often use static calibration plates with fixed settings, separating the calibration process from the detection process. This makes them unsuitable for adapting to changes in ambient light in different detection scenarios. In contrast, this solution allows the dynamic calibration component 200 to be quickly moved out of the hidden slot 102 before the sign is inspected. The dynamic calibration plate 219 is then illuminated by a light source 516 and exposed and captured by a camera 515, enabling real-time detection and calibration of the current environment. Simultaneously, the light intensity sensor transmits the ambient light intensity data to the detection and analysis system via wired transmission. The system combines the camera's captured data to automatically eliminate ambient light interference, solving the core pain point of low detection accuracy caused by ambient light interference in traditional methods. Furthermore, traditional detection devices are mostly fixed structures and cannot achieve mobile detection. This solution, however, enables full-scene mobility through the driving component 100, and with the detachable rear support component 300, significantly improves the convenience and operating range of the detection process. Traditional methods for determining reflectivity often rely on direct conversion of image grayscale values ​​captured by cameras, neglecting the dynamic influence of ambient light. The standard is "Reflectivity = Fixed Coefficient × Image Grayscale Value," leading to significant differences in detection results for the same sign under different lighting conditions and poor accuracy. This innovative solution proposes an "Ambient Light Contribution Grayscale Stripping" standard, with the formula "Sign Reflectivity = Proportional Coefficient K × (Image Grayscale Value - Ambient Light Contribution Grayscale)." The proportional coefficient K is obtained in real-time through a dynamic calibration plate 219 (with a known reflectivity), while the ambient light contribution grayscale is precisely calculated using light intensity sensor data and system algorithms. This gives the standard dynamic adaptability, reducing detection error by more than 30% compared to traditional methods. Furthermore, the judgment threshold can be flexibly adjusted according to the national standards for different types of signs (such as road signs and warning signs), resulting in broader adaptability.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the reflectivity of a sign using photographic exposure, comprising: The driving assembly (100), dynamic calibration assembly (200), rear support assembly (300), connection assembly (400) and photographic detection assembly (500) are characterized in that the driving assembly (100) includes a driving vehicle body (101), a hidden groove (102), a sealing seat (105) and an airbag-type sealing ring (106). The upper surface of the vehicle body (101) has a hidden groove (102) for hiding and placing the dynamic calibration component (200) at the rear end. A sealing seat (105) is fixedly connected to the upper surface of the vehicle body (101) around the hidden groove (102). An airbag-type sealing ring (106) is provided inside the sealing seat (105). The dynamic calibration component (200) for dynamic calibration before sign detection is installed inside the hidden groove (102). The dynamic calibration component (200) includes a dynamic calibration plate (219). A rear support component (300) is installed behind the driving component (100). The rear support component (300) includes a support for the rear bucket (301) and a placement slot (302). The upper surface of the support for the rear bucket (301) is provided with a placement slot (302). A photographic detection component (500) is installed at the rear end of the inner side of the placement slot (302). The photographic detection component (500) includes a mounting bracket (514), a camera (515), and a lighting lamp (516). The lower front end of the inner side of the mounting bracket (514) is provided with a camera (515) for realizing the detection of the reflectivity of the sign through photographic exposure. The upper inner side of the mounting bracket (514) is provided with a lighting lamp (516). The rear end of the inner side of the vehicle body (101) is also provided with a connecting component (400). The top of the vehicle body (101) is pre-installed with a light intensity sensor for monitoring the current ambient light intensity.

2. The device for detecting the reflectivity of a sign using photographic exposure as described in claim 1, characterized in that: A set of lifting racks (103) for assisting the dynamic calibration component (200) to move up and down are fixedly connected to both the left and right ends of the inner side of the hidden groove (102), and a set of lifting guide rods (104) are fixedly connected to the four corners of the inner side of the hidden groove (102). The dynamic calibration component (200) also includes a set of lifting seats (201). A set of lifting guide holes (202) are formed vertically through the four corners of the upper surface of the lifting seat (201). A linear bearing (203) is fitted inside the lifting guide hole (202). The lifting guide rod (104) is set through the linear bearing (203). A set of lifting gears (204) is provided on the inner side of both the left and right ends of the lifting seat (201) in a rotating structure. The lifting gear (204) has a rotating shaft connected through its center. A synchronous pulley (205) is sleeved on the outer side of the front end of the rotating shaft. A synchronous belt is sleeved on the outer side of the synchronous pulley (205). The synchronous belt has a double-tooth structure and meshes with the synchronous pulley (205). A lifting motor is provided in the middle of the inner side of the lifting seat (201), and a set of synchronous pulleys (205) is also sleeved on the outer side of the motor shaft. The synchronous belt engages with the idler pulley on the other side, and the synchronous pulley (205) on the other end is used to achieve reverse power transmission. The lifting gear (204) meshes with the lifting rack (103).

3. The device for detecting the reflectivity of a sign using photographic exposure as described in claim 2, characterized in that: A set of sealing air columns (206) is movably fitted into the inner sides of both the left and right ends of the lifting seat (201). The lower end of the sealing air column (206) is fixedly connected to the lower end of the hidden groove (102). A set of sealing plungers (207) is movably fitted into the inner side of the sealing air column (206) in a sealing structure. A sealing push seat (208) is fixedly connected above the sealing plungers (207). A set of return springs (209) is sleeved on the outside of the sealing push seat (208). The lifting seat (201) is provided with a set of sealing gas ducts (211) behind the left sealing gas column (206) and in front of the right sealing gas column (206). A set of sealing gas guide holes (210) are respectively opened between the two sets of sealing gas columns (206) and the two sets of sealing gas ducts (211). The lower section of the sealing gas duct (211) is a metal bellows (212). The upper end of the sealing gas duct (211) is connected to the airbag sealing ring (106). A set of duct hiding grooves is provided on the left rear end and right front end of the inner side of the hiding groove (102). The upper and lower ends of the inner side of the duct hiding groove are both rotating structures with a set of reversing pulleys (107). The sealing gas duct (211) is sleeved to the outside of the reversing pulleys (107).

4. The device for detecting the reflectivity of a sign using photographic exposure as described in claim 3, characterized in that: The lifting seat (201) is fixedly connected to four corners above each of the four corners. A hidden seat (213) is fixedly connected above the supporting column. A calibration plate placement groove (214) is opened on the rear side of the hidden seat (213). A set of sliding grooves (215) is opened on the inner side of both the left and right ends of the calibration plate placement groove (214). A limiting groove (216) is provided at one end of the slide groove (215) away from the center of the hidden seat (213). The length of the limiting groove (216) is less than one centimeter of the slide groove (215). A slide seat (217) is movably fitted inside the slide groove (215). A rotary torsion spring (218) is provided at one end of the slide seat (217) near the center of the hidden seat (213). The dynamic calibration plate (219) is located between the two sets of rotary torsion springs (218) and is arranged in a rotating structure. The dynamic calibration plate (219) is set in a vertical structure after sliding out of the calibration plate placement slot (214) area under the action of the rotary torsion spring (218). A sealing plate (220) is provided above the hidden seat (213). A sealing groove (221) is opened on the lower surface of the sealing plate (220). The sealing seat (105) is a tapered inclined structure with the outer end sunken and is fitted into the sealing groove (221). A set of sealing ring grooves (222) is also provided above the sealing groove (221), and the sealing ring grooves (222) are sealed and fitted with the expanded airbag-type sealing ring (106).

5. The apparatus for detecting the reflectivity of a sign using photographic exposure as described in claim 1, characterized in that: The photographic detection component (500) also includes a detection base (501), and a set of shock-absorbing seats (502) are fixedly connected to the four corners of the detection base (501). An adjustment groove (503) is provided on both the left and right ends of the upper surface of the detection base (501). An adjusting slide block (505) is movably fitted inside the adjusting slide groove (503). An abutting slide groove (506) is provided at one end of the upper surface of the adjusting slide block (505) away from the center of the detection base (501). A set of abutting screws (507) are rotatably connected inside the abutting slide groove (506). A set of abutting seats is also movably fitted inside the abutting slide groove (506). The abutment seat is also threaded to the abutment screw (507). Abutment pressure seats (508) are fixedly connected to both the front and rear ends of the abutment seat. A set of abutment through grooves (504) are opened at both the front and rear ends of the upper surface of the detection base (501) located in the adjustment slide groove (503). The lower end of the abutment pressure seat (508) is embedded in the abutment through groove (504) to achieve positioning after adjustment. The detection base (501) is provided with a set of screw jacks (511) in the middle. The screw jacks (511) are vertical structures with a set of lifting screws (512) in the middle. A set of upper bearings (513) is provided above the lifting screws (512). A set of slow-release grooves are provided on the left and right ends of the lower surface of the upper bearings (513) and on the upper surface of the adjusting slide (505). A set of slow-release rotating seats (510) is rotatably connected to the inner side of the slow-release rotating slot. A set of spring damping shock absorbers (509) is fixedly connected between the upper and lower sets of slow-release rotating seats (510). The upper support (513) and the mounting frame (514) are connected by a rotating structure. The mounting frame (514) is rotated by an angle adjustment motor. The angle adjustment motor is a geared motor with a built-in angle encoder and motor drive module.

6. The apparatus for detecting the reflectivity of a sign using photographic exposure as described in claim 1, characterized in that: A connecting frame (304) is fixedly connected to the front side of the supporting rear bucket (301), and a cross (305) is fixedly connected to the middle position of the connecting frame (304). A set of secondary locks (303) are fixedly connected to the front ends of both the left and right sides of the supporting rear bucket (301). A set of main latches (115) are fixedly connected to the rear ends of both sides of the vehicle body (101). The main latches (115) and the auxiliary latches (303) are used together to realize the initial connection between the driving component (100) and the rear support component (300). A connecting groove (112) is provided at the lower end of the rear side of the vehicle body (101). A cross groove (113) is provided in the middle of the connecting groove (112) facing forward. A set of connecting positioning holes (114) are provided on the four inner sides of the cross groove (113) and the four outer sides of the cross (305). The connecting frame (304) is fitted into the connecting groove (112), and the cross (305) is fitted into the cross groove (113). A set of wheel grooves (108) is also provided on the rear side of the vehicle body (101), and a positioning tooth groove (109) is provided on the front side of the wheel groove (108). The inner side of the wheel groove (108) is provided with a wire hole (110) facing directly downward. The upper inner side of the wire hole (110) is provided with a number of rolling balls (111) in a movable fitting structure. The wire hole (110) is opened towards the front end of the cross groove (113).

7. The apparatus for detecting the reflectivity of a sign using photographic exposure as described in claim 6, characterized in that: The connecting assembly (400) includes a winding wheel (401), a handwheel (403) is fixedly connected to the rear side of the winding wheel (401), a connecting rope (402) is wound around the outside of the winding wheel (401), the connecting rope (402) is threaded inside the wire hole (110) and has a rotating structure with a steering roller (409) at the bend. The take-up reel (401) is provided with a tension column (406) on the front side. A return spring (407) is sleeved on the outside of the tension column (406). A pull seat (405) is fixedly connected to the front side of the tension column (406). The pull seat (405) has a square structure and a rotating seat (404) is sleeved on the outside. The rotating seat (404) is located in front of the positioning tooth groove (109) and rotates. The lower end of the connecting rope (402) is fixedly connected to a set of pull seats (410). The outer side of the pull seat (410) has four sets of pull rods (411) that are evenly distributed in a circle. The other end of the pull rod (411) is also a rotating structure connected to a set of positioning claws (412). The rear end of the positioning claws (412) is fixedly connected to a connecting positioning post (413). The front end of the positioning claw (412) is rotatably connected to a claw seat (414), and a return spring is provided between the claw seat (414) and the pull seat (410). The connecting positioning post (413) and the connecting positioning hole (114) are fitted together. A set of positioning tooth seats (408) is also fixedly connected to the front side of the winding wheel (401), and the positioning tooth seats (408) and the positioning tooth groove (109) are fitted together.

8. The apparatus for detecting the reflectivity of a sign using photographic exposure as described in claim 6, characterized in that: The lower surface of the connecting frame (304) is provided with a support leg groove (306). Both the left and right ends of the inner side of the support leg groove (306) are rotatably connected to a set of support legs (307) via a rotary torsion spring II. The two sets of support legs (307) are hidden inside the support leg groove (306) under the rotational action of the rotary torsion spring II. Both sets of support legs (307) are connected to a set of support leg studs (308) on the inner side in a threaded structure. The end of the support leg stud (308) away from the support leg (307) is fixedly connected to a support leg base (309). When the two sets of support legs (307) are arranged in a horizontal structure, a support groove (310) is opened on the upper side. A support slide (311) is movably fitted inside the support groove (310). The inner side of the support slide (311) is rotatably connected to a rotating seat, and the outer side of the rotating seat is fixedly connected to a support rod (312). The two sets of support rods (312) are threadedly connected to a support stud (313). The support slide (310) has a retaining groove (314) recessed at one end near the center of the connecting frame (304). After the support slide (311) slides to the other end of the support slide (310), it engages with the retaining groove (314).

Images