License plate visual angle measuring instrument and measuring method thereof

Abstract

The invention discloses a license plate visual angle measuring instrument and a measuring method thereof, and relates to the technical field of visual angle measurement, the license plate visual angle measuring instrument comprises a base, an arc-shaped support and a measuring assembly, the base is provided with a supporting rod, the arc-shaped support is arranged on the supporting rod and can vertically move in the length direction of the supporting rod, and the measuring assembly is arranged on the arc-shaped support. The arc-shaped support can also rotate in the horizontal direction of the supporting rod, the measuring assembly is arranged on the arc-shaped support and can slide in the circumferential direction of the arc-shaped support, the measuring assembly comprises a laser emitter, laser of the laser emitter is horizontally emitted to the edge of one side of a vehicle license plate, and then the measuring assembly slides in the direction corresponding to the edge of the side of the vehicle license plate in the circumferential direction of the arc-shaped support. The measuring assembly is arranged on the arc-shaped support until the laser of the laser transmitter does not fall on the edge of one side of the license plate, the sliding angle of the measuring assembly on the arc-shaped support serves as the visual angle of the license plate on the edge of the side, the visual angles of the license plate in four directions can be measured at the same time through the laser transmitter of the measuring assembly, and the measuring efficiency and the measuring precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of viewing angle measurement, and particularly relates to a license plate viewing angle measuring instrument and a measuring method thereof. Background Art

[0002] At present, the visible range of the license plate is as follows: The license plate installed on the license plate should be visible within the following space range, which is composed of the following four planes: two vertical planes on both sides of the license plate and extending outward at 30°, a plane formed by the upper edge of the license plate and the horizontal plane at an upward angle of 15°. If the height of the upper edge of the license plate from the ground is greater than 1.20 m, then a plane formed by the lower edge of the license plate and the horizontal plane at a downward angle of 15°. At the same time, the license plate frame shall not block the characters on the license plate.

[0003] In the prior art, the measurement of the viewing angle of the license plate is generally carried out using an electronic angle gauge. However, there are large errors when using an electronic angle gauge for measurement. Summary of the Invention

[0004] Embodiments of the present invention provide a license plate viewing angle measuring instrument and a measuring method thereof to solve the technical problem of large errors existing in the prior art when using an electronic angle gauge to measure the viewing angle of the license plate.

[0005] In a first aspect, a license plate viewing angle measuring instrument is provided, including:

[0006] A base, on which a support rod is provided;

[0007] An arc-shaped bracket, which is provided on the support rod and can move vertically along its length direction, and the arc-shaped bracket can also rotate horizontally along the support rod;

[0008] A measuring component, which is provided on the arc-shaped bracket and can slide along its circumferential direction, and the measuring component includes a laser emitter;

[0009] The laser of the laser emitter is horizontally projected onto one side edge of the vehicle license plate, and then the measuring component is slid along the circumference of the arc-shaped bracket in the corresponding direction of this side edge of the license plate until the laser of the laser emitter no longer falls on one side edge of the license plate. The sliding angle of the measuring component on the arc-shaped bracket is used as the viewing angle of the license plate on this side edge.

[0010] In some embodiments, the arc-shaped bracket includes:

[0011] An arc-shaped rack, which is provided on the support rod;

[0012] An arc-shaped guide rail, which is provided on one side of the arc-shaped rack, and the measuring component is provided on the arc-shaped guide rail and slides along the circumferential direction of the arc-shaped rack.

[0013] In some embodiments, the arc-shaped bracket further includes:

[0014] A fixed seat, which is arranged on the connecting seat between the arc-shaped rack and the support rod;

[0015] A rotating frame, which is arranged on the arc-shaped rack and is rotatably connected to the fixed seat. The rotating frame is used to drive the arc-shaped rack and the arc-shaped guide rail to rotate horizontally along the support rod.

[0016] In some embodiments, the measurement assembly further includes:

[0017] A measurement seat, which is arranged on the arc-shaped guide rail, and a laser emitter is arranged on the outer side surface of the measurement seat;

[0018] A gear, which is arranged on the inner side surface of the measurement seat, and the gear meshes with the arc-shaped rack and slides along its circumferential direction;

[0019] A first motor, which is arranged on the outer side surface of the measurement seat and is connected to the gear, and is used to drive the gear to rotate and drive the measurement seat to slide.

[0020] In some embodiments, the measurement assembly further includes:

[0021] A plurality of rollers, and a plurality of the rollers are all arranged on the inner side surface of the measurement seat and are distributed on both sides of the arc-shaped guide rail. A plurality of the rollers can all slide along the circumferential direction of the arc-shaped guide rail.

[0022] In some embodiments, there are three rollers, and the three rollers are distributed in a triangular shape on both sides of the arc-shaped guide rail and can slide along its circumferential direction.

[0023] In some embodiments, the support rod includes:

[0024] A stabilizing rod, which is arranged on the base along the vertical direction;

[0025] A lead screw, which is arranged at the front end of the stabilizing rod along the vertical direction;

[0026] A lead screw nut, which is arranged on the lead screw and is connected to the connecting seat;

[0027] A second motor, which is arranged at the bottom end of the lead screw and is used to drive the lead screw to rotate to drive the arc-shaped bracket to move along the length direction of the lead screw.

[0028] In some embodiments, the license plate angle measuring instrument further includes:

[0029] Arc-shaped claw, the arc-shaped claw is arranged on the arc-shaped rack and connected to the rotating frame, and the arc-shaped rack can move along the circumferential direction of the arc-shaped claw.

[0030] Second, a method for measuring the visible angle of a license plate is provided, using the aforementioned visible angle measuring instrument for license plates, including the following steps:

[0031] Place the base at the front end of the vehicle license plate, and horizontally project the laser of the laser emitter onto one side edge of the vehicle license plate.

[0032] Then slide the measuring component along the circumference of the arc-shaped bracket in the corresponding direction of the side edge of the license plate until the laser of the laser emitter no longer falls on the side edge of the license plate.

[0033] Take the sliding angle of the measuring component on the arc-shaped bracket as the visible angle of the license plate at this side edge.

[0034] In some embodiments, taking the sliding angle of the measuring component on the arc-shaped bracket as the visible angle of the license plate at this side edge includes:

[0035] Obtain the pulse signal for driving the laser emitter of the measuring component to slide along the circumference of the arc-shaped bracket in the direction of one side edge of the license plate.

[0036] Calculate the sliding angle of the measuring component on the arc-shaped bracket according to the angle conversion ratio between the pulse signal of the measuring component and the arc-shaped bracket, and take the sliding angle of the measuring component on the arc-shaped bracket as the visible angle of the license plate at this side edge.

[0037] The beneficial effects brought by the technical solutions provided by the present invention include:

[0038] The embodiment of the present invention provides a visible angle measuring instrument for a license plate and its measuring method. The visible angle measuring instrument for a license plate includes: a base, an arc-shaped bracket, and a measuring component. A support rod is provided on the base. The arc-shaped bracket is arranged on the support rod and can move vertically along its length direction. The arc-shaped bracket can also rotate horizontally along the support rod. The measuring component is arranged on the arc-shaped bracket and can slide along its circumferential direction. The measuring component includes a laser emitter. Horizontally project the laser of the laser emitter onto one side edge of the vehicle license plate, and then slide the measuring component along the circumference of the arc-shaped bracket in the corresponding direction of the side edge of the license plate until the laser of the laser emitter no longer falls on the side edge of the license plate. Take the sliding angle of the measuring component on the arc-shaped bracket as the visible angle of the license plate at this side edge. The visible angles of four directions of the license plate can be measured simultaneously through the laser emitter of the measuring component, improving the measuring efficiency and measuring accuracy. Description of the Drawings

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0040] Figure 1 FIG. 4 is a front structural schematic diagram of a license plate visual angle measuring instrument provided by an embodiment of the present invention;

[0041] Figure 2 FIG. 5 is a back structural schematic diagram of a license plate visual angle measuring instrument provided by an embodiment of the present invention;

[0042] Figure 3 FIG. 6 is a schematic diagram of the measurement process of a license plate visual angle measuring instrument provided by an embodiment of the present invention;

[0043] Reference numerals:

[0044] 1, base;

[0045] 2, support rod; 21, stabilizing rod; 22, lead screw; 23, lead screw nut; 24, second motor;

[0046] 3, arc bracket; 31, arc rack; 32, arc guide rail; 33, fixed seat; 34, rotating frame;

[0047] 4, measurement component; 41, laser emitter; 42, measurement seat; 43, gear; 44, first motor; 45, roller;

[0048] 5, license plate;

[0049] 6, connecting seat;

[0050] 7, arc claw. Detailed implementation manners

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0052] The embodiments of the present invention provide a license plate visual angle measuring instrument and a measuring method thereof, which can solve the technical problem of large errors in measuring the visual angle of a license plate by using an electronic angle ruler in the related art.

[0053] Figure 1 It is a visual angle measuring instrument for license plate boards according to an embodiment of the present invention, including: a base 1, an arc-shaped bracket 3, and a measuring component 4. A support rod 2 is provided on the base 1. The arc-shaped bracket 3 is arranged on the support rod 2 and can move vertically along its length direction. The arc-shaped bracket 3 can also rotate horizontally along the support rod 2. The measuring component 4 is arranged on the arc-shaped bracket 3 and can slide along its circumferential direction. The measuring component 4 includes a laser emitter 41. The laser of the laser emitter 41 is horizontally projected onto one side edge of the vehicle license plate board 5. Then, the measuring component 4 is slid along the circumference of the arc-shaped bracket 3 in the corresponding direction of the side edge of the license plate board 5 until the laser of the laser emitter 41 no longer falls on one side edge of the license plate board 5. The sliding angle of the measuring component 4 on the arc-shaped bracket 3 is used as the visual angle of the license plate board 5 at this side edge.

[0054] The visual angle measuring instrument for license plate boards provided by the embodiment of the present invention is provided with a base, an arc-shaped bracket, and a measuring component. A support rod is provided on the base. The arc-shaped bracket is arranged on the support rod and can move vertically along its length direction. The arc-shaped bracket can also rotate horizontally along the support rod. The measuring component is arranged on the arc-shaped bracket and can slide along its circumferential direction. The measuring component includes a laser emitter. The laser of the laser emitter is horizontally projected onto one side edge of the vehicle license plate board. Then, the measuring component is slid along the circumference of the arc-shaped bracket in the corresponding direction of the side edge of the license plate board until the laser of the laser emitter no longer falls on one side edge of the license plate board. When the laser of the laser emitter is horizontally projected onto the upper side edge of the vehicle license plate board, then the measuring component is slid along the circumference of the arc-shaped bracket in the direction of the upper side edge of the license plate board until the laser of the laser emitter no longer falls on the upper side edge of the license plate board. The sliding angle of the measuring component on the arc-shaped bracket is used as the visual angle of the license plate board at the upper side edge. When the laser of the laser emitter is horizontally projected onto the lower side edge of the vehicle license plate board, then the measuring component is slid along the circumference of the arc-shaped bracket in the direction of the lower side edge of the license plate board until the laser of the laser emitter no longer falls on the lower side edge of the license plate board. The sliding angle of the measuring component on the arc-shaped bracket is used as the visual angle of the license plate board at the lower side edge. When measuring the visual angles of the left side edge and the right side edge of the license plate board, first rotate the arc-shaped bracket horizontally along the support rod, and the rest is the same as the above steps. The visual angles of the four directions of the license plate board can be measured simultaneously by the laser emitter of the measuring component, improving the measurement efficiency and measurement accuracy.

[0055] As an optional implementation manner, in an embodiment of the invention, see Figure 1 and Figure 2As shown, the arc-shaped bracket 3 includes: an arc-shaped rack 31 and an arc-shaped guide rail 32. The arc-shaped rack 31 is arranged on the support rod 2, and the arc-shaped guide rail 32 is arranged on one side of the arc-shaped rack 31. The measuring assembly 4 is arranged on the arc-shaped guide rail 32 and slides along the circumferential direction of the arc-shaped rack 31. The arc-shaped rack 31 and the arc-shaped guide rail 32 are concentric and of equal length. The arc-shaped guide rail 32 is fixed to one side of the arc-shaped rack 31, and the measuring assembly 4 can slide along the circumferential direction of the arc-shaped guide rail 32 and the arc-shaped rack 31.

[0056] As an optional implementation manner, in an inventive embodiment, refer to Figure 1 and Figure 2 As shown, the arc-shaped bracket 3 further includes: a fixed seat 33 and a rotating frame 34. The fixed seat 33 is arranged on the connecting seat 6 between the arc-shaped rack 31 and the support rod 2, and the rotating frame 34 is arranged on the arc-shaped rack 31 and is rotatably connected to the fixed seat 33. The rotating frame 34 is used to drive the arc-shaped rack 31 and the arc-shaped guide rail 32 to rotate horizontally along the support rod 2. When measuring the visible angle of the left edge of the license plate 5, rotate the rotating frame 34 to drive the arc-shaped rack 31 and the arc-shaped guide rail 32 to rotate horizontally along the support rod 2, so that the measuring assembly 4 and the laser emitter 41 are located in front of the left edge of the license plate 5. Horizontally shoot the laser of the laser emitter 41 on the left edge of the vehicle license plate 5, and then slide the measuring assembly 4 along the circumference of the arc-shaped bracket 3 towards the left edge of the license plate 5 until the laser of the laser emitter 41 does not fall on the left edge of the license plate 5. Take the sliding angle of the measuring assembly 4 on the arc-shaped rack 31 as the visible angle of the left edge of the license plate 5. When measuring the visible angle of the right edge of the license plate 5, rotate the rotating frame 34 to drive the arc-shaped rack 31 and the arc-shaped guide rail 32 to rotate horizontally along the support rod 2, so that the measuring assembly 4 and the laser emitter 41 are located in front of the right edge of the license plate 5. Horizontally shoot the laser of the laser emitter 41 on the right edge of the vehicle license plate 5, and then slide the measuring assembly 4 along the circumference of the arc-shaped bracket 3 towards the right edge of the license plate 5 until the laser of the laser emitter 41 does not fall on the right edge of the license plate 5. Take the sliding angle of the measuring assembly 4 on the arc-shaped rack 31 as the visible angle of the right edge of the license plate 5.

[0057] As an optional implementation manner, in an inventive embodiment, refer to Figure 1 and Figure 2As shown in the figure, the measuring component 4 further includes: a measuring base 42, a gear 43, and a first motor 44. The measuring base 42 is arranged on the arc-shaped guide rail 32. A laser emitter 41 is arranged on the outer side surface of the measuring base 42. The gear 43 is arranged on the inner side surface of the measuring base 42. The gear 43 meshes with the arc-shaped rack 31 and slides along its circumferential direction. The first motor 44 is arranged on the outer side surface of the measuring base 42 and is connected to the gear 43, and is used to drive the gear 43 to rotate and drive the measuring base 42 to slide. After the laser of the laser emitter 41 is horizontally emitted on one side edge of the vehicle license plate, the first motor 44 is started to drive the gear 43 to drive the measuring base 42 and the laser emitter 41 to slide along the circumference of the arc-shaped rack 31 towards this side edge until the laser of the laser emitter 41 does not fall on this side edge of the license plate 5. The movement is transmitted through the meshing of the gear and the rack, with a simple structure, low cost, flexible movement direction conversion, and high transmission efficiency.

[0058] As an alternative embodiment, in an invention embodiment, refer to Figure 1 and Figure 2 As shown in the figure, the measuring component 4 further includes: a plurality of rollers 45. A plurality of the rollers 45 are all arranged on the inner side surface of the measuring base 42 and are distributed on both sides of the arc-shaped guide rail 32. A plurality of the rollers 45 can all slide along the circumferential direction of the arc-shaped guide rail 32. The plurality of rollers 45 play a role in supporting and guiding, ensuring the correct meshing and stable transmission between the gear 43 and the arc-shaped rack 31. When the first motor 44 drives the gear 43 to slide along the circumferential direction of the arc-shaped rack 31, the plurality of rollers 45 simultaneously slide along the circumferential direction of the arc-shaped guide rail 32, reducing the frictional resistance between the measuring component 4 and the arc-shaped bracket 3.

[0059] As an alternative embodiment, in an invention embodiment, refer to Figure 1 and Figure 2 As shown in the figure, there are three rollers 45. The three rollers 45 are distributed in a triangular shape on both sides of the arc-shaped guide rail 32 and can slide along its circumferential direction. The three rollers 45 distributed in a triangular shape play a supporting role, and can stably fix the measuring base 42 on the arc-shaped guide rail 32, reducing the vibration and offset of the gear 43 during operation, improving the smoothness and accuracy of the transmission, and the rollers 45 can also reduce vibration and noise.

[0060] As an alternative embodiment, in an invention embodiment, refer to Figure 1 and Figure 2As shown in the figure, the support rod 2 includes: a stabilizing rod 21, a lead screw 22, a lead screw nut 23, and a second motor 24. The stabilizing rod 21 is vertically arranged on the base 1. The lead screw 22 is vertically arranged at the front end of the stabilizing rod 21. The lead screw nut 23 is arranged on the lead screw 22 and connected to the connecting seat 6. The second motor 24 is arranged at the bottom end of the lead screw 22 and is used to drive the lead screw 22 to rotate to drive the arc-shaped bracket 3 to move along the length direction of the lead screw 22. The top end of the second motor 24 is connected to the bottom end of the lead screw 22 through a coupling. When the second motor 24 is started to drive the lead screw 22 to rotate, the rotational motion of the lead screw 22 is converted into a linear motion through the lead screw nut 23, and the lead screw nut 23 drives the arc-shaped bracket 3 to vertically move along the length direction of the lead screw 22, thereby adjusting the height of the arc-shaped bracket 3. The stabilizing rod 21 plays a role in stable support and is used to stably support the support rod 2.

[0061] As an optional implementation manner, in an invention embodiment, refer to Figure 1 and Figure 2 As shown in the figure, the license plate visual angle measuring instrument further includes: an arc-shaped claw 7. The arc-shaped claw 7 is arranged on the arc-shaped rack 31 and connected to the rotating frame 34. The arc-shaped rack 31 can move along the circumferential direction of the arc-shaped claw 7. The arc-shaped claw 7 is concentric with the arc-shaped rack 31 and the arc-shaped guide rail 32. The arc-shaped rack 31 and the arc-shaped guide rail 32 can move along the circumferential direction of the arc-shaped claw 7, so as to adjust the outward extension length of the arc-shaped rack 31 and the arc-shaped guide rail 32 to avoid interference or collision with the vehicle. A plurality of bolt holes are also arranged at intervals on the arc-shaped claw 7. After adjusting the extension length of the arc-shaped rack 31 and the arc-shaped guide rail 32, bolts are used to penetrate the arc-shaped claw 7 to clamp and fix the arc-shaped bracket 3.

[0062] The embodiment of the present invention also provides a method for measuring the visual angle of a license plate. Refer to Figure 3 As shown in the figure, it includes the following steps: The base 1 is arranged at the front end of the vehicle license plate 5. The laser of the laser emitter 41 is horizontally emitted on one side edge of the vehicle license plate 5. Then, the measuring assembly 4 is slid along the circumferential direction of the arc-shaped bracket 3 towards the corresponding direction of the side edge of the license plate 5 until the laser of the laser emitter 41 no longer falls on one side edge of the license plate 5. The sliding angle of the measuring assembly 4 on the arc-shaped bracket 3 is used as the visual angle of the license plate 5 at this side edge.

[0063] The method for measuring the visible angle of the license plate board according to the embodiment of the present invention is as follows: the base is arranged at the front end of the vehicle license plate board, the laser of the laser emitter is horizontally projected onto one side edge of the vehicle license plate board, and then the measuring component is slid along the circumference of the arc-shaped bracket in the corresponding direction of the side edge of the license plate board until the laser of the laser emitter no longer falls on the side edge of the license plate board. The sliding angle of the measuring component on the arc-shaped bracket is used as the visible angle of the license plate board at the side edge. When the laser of the laser emitter is horizontally projected onto the upper side edge of the vehicle license plate board, then the measuring component is slid along the circumference of the arc-shaped bracket in the direction of the upper side edge of the license plate board until the laser of the laser emitter no longer falls on the upper side edge of the license plate board. The sliding angle of the measuring component on the arc-shaped bracket is used as the visible angle of the license plate board at the upper side edge. When the laser of the laser emitter is horizontally projected onto the lower side edge of the vehicle license plate board, then the measuring component is slid along the circumference of the arc-shaped bracket in the direction of the lower side edge of the license plate board until the laser of the laser emitter no longer falls on the lower side edge of the license plate board. The sliding angle of the measuring component on the arc-shaped bracket is used as the visible angle of the license plate board at the lower side edge. When measuring the visible angles of the left side edge and the right side edge of the license plate board, first rotate the arc-shaped bracket horizontally along the support rod, and the rest is the same as the above steps. The visible angles of the four directions of the license plate board can be measured simultaneously by the laser emitter of the measuring component, improving the measurement efficiency and measurement accuracy.

[0064] As an optional implementation manner, in an embodiment of the invention, using the sliding angle of the measuring component 4 on the arc-shaped bracket 3 as the visible angle of the license plate board 5 at the side edge includes: obtaining the pulse signal for driving the laser emitter 41 of the measuring component 4 to slide along the circumference of the arc-shaped bracket 3 in the direction of one side edge of the license plate board 5; calculating the sliding angle of the measuring component 4 on the arc-shaped bracket 3 according to the angle conversion ratio between the pulse signal of the measuring component 4 and the arc-shaped bracket 3, and using the sliding angle of the measuring component 4 on the arc-shaped bracket 3 as the visible angle of the license plate board 5 at the side edge.

[0065] Specifically, refer to Figure 3As shown, the first motor 44 is a servo motor. The first motor 44 drives the gear 43 to drive the measuring seat 42 and the laser emitter 41 to slide one circle along the circumferential direction of the arc-shaped rack 31, and the output pulse is 1000P. The tooth number ratio of the gear 43 to the arc-shaped rack 31 is 1:25. Then, the angle conversion ratio of the first motor 44 driving the gear 43 to slide one circle along the circumferential direction of the arc-shaped rack 31 is 69.44P / ° (25 / 360° * 1000P). When the laser of the laser emitter 41 does not fall on one side edge of the license plate 5, the output pulse signal P of the first motor 44 is obtained, and the output pulse signal P of the first motor 44 is divided by the angle conversion ratio 69.44P / ° to calculate the sliding angle of the measuring assembly 4 on the arc-shaped bracket 3. The sliding angle of the measuring assembly 4 on the arc-shaped bracket 3 is used as the visible angle of the license plate 5 at this side edge.

[0066] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. Unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0067] It should be noted that in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0068] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features of the present invention disclosed herein.

Claims

1. A license plate board visual angle measuring instrument, characterized in that, Comprising: A base (1), on which a support rod (2) is provided; An arc-shaped bracket (3), which is arranged on the support rod (2) and can move vertically along its length direction, and the arc-shaped bracket (3) can also rotate horizontally along the support rod (2); A measuring component (4), which is arranged on the arc-shaped bracket (3) and can slide along its circumferential direction, and the measuring component (4) includes a laser emitter (41); The laser of the laser emitter (41) is horizontally projected on one side edge of the vehicle license plate (5), and then the measuring component (4) is slid along the circumference of the arc-shaped bracket (3) towards the corresponding direction of this side edge of the license plate (5) until the laser of the laser emitter (41) does not fall on one side edge of the license plate (5), and the sliding angle of the measuring component (4) on the arc-shaped bracket (3) is used as the visible angle of the license plate (5) on this side edge.

2. The number plate board viewing angle measuring instrument according to claim 1, characterized in that, The arc-shaped bracket (3) includes: An arc-shaped rack (31), which is arranged on the support rod (2); An arc-shaped guide rail (32), which is arranged on one side of the arc-shaped rack (31), and the measuring component (4) is arranged on the arc-shaped guide rail (32) and slides along the circumferential direction of the arc-shaped rack (31).

3. The license plate board viewing angle measuring instrument according to claim 2, characterized in that, The arc-shaped bracket (3) further includes: A fixed seat (33), which is arranged on the connecting seat (6) between the arc-shaped rack (31) and the support rod (2); A rotating frame (34), which is arranged on the arc-shaped rack (31) and is rotatably connected to the fixed seat (33), and the rotating frame (34) is used to drive the arc-shaped rack (31) and the arc-shaped guide rail (32) to rotate horizontally along the support rod (2).

4. The license plate board viewing angle measuring instrument according to claim 2, characterized in that, The measuring component (4) further includes: A measuring seat (42), which is arranged on the arc-shaped guide rail (32), and the laser emitter (41) is arranged on the outer side surface of the measuring seat (42); A gear (43), which is arranged on the inner side surface of the measuring seat (42), and the gear (43) meshes with the arc-shaped rack (31) and slides along its circumferential direction; A first motor (44), which is arranged on the outer side surface of the measuring seat (42) and is connected to the gear (43), and is used to drive the gear (43) to rotate and drive the measuring seat (42) to slide.

5. The license plate board visual angle measuring instrument according to claim 4, characterized in that, The measuring component (4) further includes: A plurality of rollers (45), and a plurality of the rollers (45) are all arranged on the inner side surface of the measuring seat (42) and are distributed on both sides of the arc-shaped guide rail (32), and a plurality of the rollers (45) can all slide along the circumferential direction of the arc-shaped guide rail (32).

6. The license plate visible angle measuring instrument according to claim 5, wherein: There are three rollers (45), and the three rollers (45) are distributed in a triangular shape on both sides of the arc-shaped guide rail (32) and can slide along its circumferential direction.

7. The license plate board viewing angle measuring instrument according to claim 3, wherein The support rod (2) includes: A stabilizer bar (21), the stabilizer bar (21) is arranged on the base (1) in the vertical direction; A lead screw (22), the lead screw (22) is arranged at the front end of the stabilizer bar (21) in the vertical direction; A lead screw nut (23), the lead screw nut (23) is arranged on the lead screw (22) and connected to the connecting seat (6); A second motor (24), the second motor (24) is arranged at the bottom end of the lead screw (22) and is used to drive the lead screw (22) to rotate to drive the arc-shaped bracket (3) to move along the length direction of the lead screw (22).

8. The license plate board viewing angle measuring instrument according to claim 3, characterized in that, It further includes: An arc-shaped claw (7), the arc-shaped claw (7) is arranged on the arc-shaped rack (31) and connected to the rotating frame (34), and the arc-shaped rack (31) can move along the circumferential direction of the arc-shaped claw (7).

9. A method for measuring the viewing angle of a license plate board, using the license plate board viewing angle measuring instrument described in claim 1, characterized in that, It includes the following steps: Arrange the base (1) at the front end of the vehicle license plate (5), and horizontally project the laser of the laser emitter (41) on one side edge of the vehicle license plate (5); Then make the measuring assembly (4) slide along the circumference of the arc-shaped bracket (3) in the corresponding direction of the side edge of the license plate (5) until the laser of the laser emitter (41) does not fall on one side edge of the license plate (5); Take the sliding angle of the measuring assembly (4) on the arc-shaped bracket (3) as the visible angle of the license plate (5) on this side edge.

10. The method for measuring the visible angle of the license plate board according to claim 9, wherein Taking the sliding angle of the measuring assembly (4) on the arc-shaped bracket (3) as the visible angle of the license plate (5) on this side edge includes: Obtain the pulse signal of the measuring assembly (4) driving the laser emitter (41) to slide along the circumference of the arc-shaped bracket (3) in the direction of one side edge of the license plate (5); Calculate the sliding angle of the measuring assembly (4) on the arc-shaped bracket (3) according to the angle conversion ratio between the pulse signal of the measuring assembly (4) and the arc-shaped bracket (3), and take the sliding angle of the measuring assembly (4) on the arc-shaped bracket (3) as the visible angle of the license plate (5) on this side edge.

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