Wheel size measuring device

Abstract

The utility model discloses a kind of wheel size measuring devices, including seat body;Positioning assembly, including cross bar and two wheel positioning shaft, one end of cross bar is detachably arranged in seat body, two wheel positioning shaft are spaced apart and arranged in cross bar;Measuring assembly, including laser sensor and camera, laser sensor and camera are detachably arranged in seat body, and the emission end of laser sensor and the shooting end of camera are all towards the wheel rut surface of wheel, the laser measurement point of laser sensor emission to wheel rut surface is located in the shooting range of camera;Controller is arranged in seat body, and is connected with laser sensor and camera signal. User only needs to adhere two wheel positioning shaft in wheel rut surface, utilizes laser sensor and camera to obtain wheel size data quickly, calculates characteristic size in real time by controller, can significantly improve measurement efficiency, and entire wheel size measuring device is convenient to carry and operate, suitable for a variety of measurement scenes, can save time and manpower greatly.

Description

Technical Field

[0001] This utility model relates to the technical field of wheel measurement, and in particular to a wheel size measuring device. Background Technology

[0002] During train operation, the wheels wear down continuously, and their characteristic dimensions change rapidly. Wheel size measuring devices can be used to perform regular maintenance and inspection of train wheels, helping technicians to quickly and accurately assess wheel wear and develop reasonable maintenance plans.

[0003] In some related technologies, such as patent publication number CN113776446A, a wheel inner distance measuring device and system are disclosed. The wheel inner distance measuring device includes a bracket, which includes a base plate. A laser sensor and a camera are mounted on the base plate. The laser sensor scans a laser beam towards the inner side of the wheel, and the illumination range of the camera covers the scanning range of the laser sensor. The data acquired by the laser sensor and the camera are uploaded to a controller for distance measurement. The wheel inner distance measuring system includes the aforementioned wheel inner distance measuring device. Several of these devices are spaced apart between two parallel rails, a first rail and a second rail. The top surface of each wheel inner distance measuring device is lower than the first rail and the second rail. The first rail is for the left wheel to travel on, and the second rail is for the right wheel to travel on.

[0004] The above solution has a technical problem: during the measurement process, the left and right wheels need to be placed on the first and second rails respectively to complete the measurement. This solution is quite cumbersome. If a large number of wheel dimensions need to be measured, this solution will greatly reduce the measurement efficiency and consume a lot of time and manpower. Utility Model Content

[0005] To overcome the shortcomings of existing technical solutions, this utility model provides a wheel size measuring device.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A wheel size measuring device, the measuring device comprising:

[0008] seat body;

[0009] A positioning assembly, comprising a crossbar and two wheel positioning axles, one end of the crossbar being detachably mounted to the seat, and the two wheel positioning axles being spaced apart from the crossbar;

[0010] A measurement component, comprising a laser sensor and a camera, both detachably mounted on the base, wherein the emitting end of the laser sensor and the imaging end of the camera are both oriented toward the rut surface of the wheel, and the laser measurement point emitted by the laser sensor toward the rut surface is located within the imaging range of the camera;

[0011] A controller, disposed within the seat and connected to the laser sensor and the camera signal, is used to calculate the characteristic dimensions of the wheel.

[0012] As a preferred technical solution of this utility model, the base includes a base and a protective cover. The laser sensor and the camera are detachably mounted on the base. The protective cover is detachably mounted on the base. The protective cover has a laser emission hole corresponding to the emitting end of the laser sensor and a photo capture port corresponding to the shooting end of the camera.

[0013] One end of the crossbar is detachably mounted on the base.

[0014] As a preferred technical solution of this utility model, the base is provided with a touch screen display, and the touch screen display is signal connected to the controller.

[0015] As a preferred technical solution of this utility model, the base is further provided with a starting component, which is signal-connected to the controller.

[0016] As a preferred technical solution of this utility model, the controller is equipped with a wireless signal transmitter.

[0017] As a preferred technical solution of this utility model, the crossbar is provided with two positioning cavities, and one end of each wheel positioning axle is provided with a connecting part, and each connecting part is detachably disposed in the corresponding positioning cavity.

[0018] As a preferred technical solution of this utility model, the positioning cavity is provided with a locking hole, and the connecting part is provided with a fixing hole;

[0019] The dimensional measuring device also includes a locking element, which is detachably inserted into both the locking hole and the fixing hole.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] Users simply need to align the two wheel positioning shafts with the wheel contour simultaneously, then use a laser sensor to emit a laser, and use a camera to capture the laser measurement point located on the wheel's rut ​​surface to quickly obtain wheel size data. The controller calculates the feature dimensions in real time, thus avoiding the tedious operation of adjusting the position of each wheel individually as in existing solutions, significantly improving measurement efficiency. Moreover, the entire wheel size measuring device is easy to carry and operate, suitable for various measurement scenarios, and especially suitable for the rapid measurement of a large number of wheels, thereby greatly saving time and manpower. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the wheel size measuring device according to an embodiment of the present invention.

[0024] Figure 2 yes Figure 1 Another structural diagram of the wheel size measuring device.

[0025] Figure 3 This is an exploded view of the base and protective cover of an embodiment of this utility model.

[0026] Figure 4 This is a structural diagram of the base and measuring components according to an embodiment of the present invention.

[0027] Figure 5 This is an exploded view of the crossbar and wheel positioning shaft of an embodiment of this utility model.

[0028] Figure 6 yes Figure 5 Another structural diagram from another angle.

[0029] Figure 7 This is a block diagram of the controller and measurement components according to an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the wheel size measuring device in use according to an embodiment of this utility model.

[0031] Numbers in the diagram

[0032] 1. Base; 11. Surface; 111. Inclined surface; 12. Protective cover; 121. Laser emission port; 122. Camera aperture;

[0033] 2. Positioning assembly; 21. Crossbar; 211. Positioning cavity; 212. Locking hole; 22. Wheel positioning shaft; 221. Connecting part; 222. Fixing hole;

[0034] 3. Measurement components; 31. Laser sensor; 32. Camera;

[0035] 4. Touch screen display;

[0036] 5. Start the component;

[0037] 6. Controller;

[0038] 7. Wireless signal transmitter. Detailed Implementation

[0039] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0040] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0041] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0042] When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0045] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0046] To address the technical problem that the solutions in the background technology are cumbersome in the measurement process, and that this solution will greatly reduce measurement efficiency and consume a lot of time and manpower when measuring a large number of wheel sizes, this utility model provides a wheel size measuring device.

[0047] The following describes in detail the specific structure of a wheel size measuring device provided by an embodiment of this utility model, according to the appendix. Figure 1-8 As shown, the specific structure of the wheel size measuring device includes a seat 1, a measuring component 3, a positioning component 2, and a controller 6.

[0048] The positioning assembly 2 includes a crossbar 21 and two wheel positioning shafts 22. One end of the crossbar 21 is detachably mounted on the seat 1, and the two wheel positioning shafts 22 are spaced apart from each other on the crossbar 21.

[0049] Specifically, one end of the crossbar 21 is detachably connected to the base 1, which can be achieved through a threaded connection, snap-fit ​​connection, or other quick-disassembly structure. For example, the end of the crossbar 21 is provided with a threaded hole. After tightening the bolt through the base 1 and inserting the bolt into the threaded hole, the crossbar 21 is fixed to the base 1. This configuration allows the crossbar 21 to be quickly replaced or adjusted according to different wheel sizes or measurement requirements. For example, for wheels of different diameters, crossbars 21 of different lengths or shapes may be required to adapt to measurement requirements. Two wheel positioning shafts 22 are spaced apart on the crossbar 21. The use of two wheel positioning shafts 22 ensures the stability of the measuring device on the wheel, avoiding instability or measurement errors caused by single-point contact. The wheel positioning shafts 22 are designed in a cylindrical shape. For standard train wheels, the positioning shafts are designed in a cylindrical shape to fit the wheel rim.

[0050] The user holds the base 1 and simultaneously attaches the two wheel positioning shafts 22 to the wheel flange or rut surface. The tight fit between the positioning shafts and the wheel ensures that the relative position between the measuring device and the wheel is fixed. The spacing between the two positioning shafts keeps the measuring device stable on the wheel, avoiding instability or measurement errors caused by single-point contact. Subsequently, in conjunction with the measurement components 3 (such as the laser sensor 31 and the camera 32), the measuring device can be accurately aligned with the measurement position of the wheel.

[0051] The measuring component 3 includes a laser sensor 31 and a camera 32. Both the laser sensor 31 and the camera 32 are detachably mounted on the base 1. The emitting end of the laser sensor 31 and the shooting end of the camera 32 are both facing the rut surface of the wheel. The laser measurement point emitted by the laser sensor towards the rut surface is located within the shooting range of the camera.

[0052] Specifically, the laser sensor 31 is an optical sensor that uses a laser beam to measure distance. It includes a laser emitter and a receiver. The laser emitter emits a laser beam and the receiver receives the reflected light to calculate the distance to the target object.

[0053] The laser measurement principles include algebraic methods and trigonometric methods.

[0054] For example, laser emitter 31 emits a laser beam toward the wheel rut surface. After the laser beam hits the wheel rut surface, part of the laser beam is reflected back. Receiver captures the reflected light and converts it into an electrical signal. Based on the received light signal, it calculates the distance from each laser measurement point on the wheel rut surface to the laser sensor using triangulation. The calculated distance data is then output to controller 6 for further processing and analysis.

[0055] Specifically, the triangulation method of this utility model embodiment determines a circle by three points, mainly used to find the center of the circle. The center of the circle is the intersection of the perpendicular bisectors of the sides of the triangle. Since the distance from the center of the circle to any point on the circle is equal, this distance is the radius. Therefore, the center of the circle must lie on the perpendicular bisector of the line connecting any two points, and the intersection of the three perpendicular bisectors is the center of the circle. The distance from the center of the circle to any point is the radius.

[0056] It should be noted that after a wheel travels hundreds of thousands of kilometers, the rutted surface will show 1-2mm of wear. After this wear, the wheel can be repaired. At this point, the rolling circle and the outer rim circle are concentric circles because they are machined simultaneously, and the radius difference is a standard value called the rim height. Most wheels have a fixed initial rim height of 28mm. As the wheel wears and becomes out of round, the rim height will change, and it will vary at different locations. However, since the rim wears almost nothing and is closer to an ideal circle, triangulation will provide a more accurate measurement. Calculations show that when a wheel is out of round, the out-of-roundness error will significantly affect the diameter analysis of the three-point circle measurement. For example, a 0.1mm out-of-roundness error will result in approximately a 1mm diameter measurement error. Therefore, in this case, measuring the rim diameter and rim height, and then converting this to calculate the rolling circle diameter, will improve the accuracy of the measurement.

[0057] according to Figure 8 As shown, the algebraic method in this embodiment of the invention specifically uses the standard equation of a circle for calculation, as detailed below:

[0058] Assume three known points are P1(x1,γ1), P2(x2,γ2), and P3(x3,γ3), and the center of the circle is O(x0,γ0) with radius r. Based on the fact that the distances from each point to the center of the circle are equal, we can obtain the following system of equations:

[0059]

[0060] Eliminate the quadratic term r according to the following formula. 2 This yields a system of linear equations for x0 and γ0:

[0061]

[0062] Obtain intermediate variables using the following formula:

[0063] a = x1 - x2, b = y1 - y2

[0064] c = x1 - x3, d = y1 - y3,

[0065]

[0066] Calculate the coordinates of the center of the circle (x0, γ0) using the following formula:

[0067]

[0068] Where, det = a*db*c.

[0069] Finally, after obtaining the coordinates of the circle's center, the radius can be used to calculate the distance from the center to any point, for example:

[0070]

[0071] In this way, by using three known points to determine the center and radius of a circle, the distance from the center to any point can be calculated.

[0072] The camera 32 is positioned to capture images of the wheel rut surface, specifically the laser measurement points emitted by the laser emitter. By capturing these laser measurement points and processing the acquired images, edge information of the wheel rut surface is extracted. Common image processing algorithms include the Canny algorithm, used to detect edges in the image. The shape of the wheel rut surface is then extracted from the edge-detected image. Finally, the extracted rut surface data is output to the controller 6 for further processing and analysis.

[0073] The combined use of laser sensor 31 and camera 32 can compensate for the shortcomings of a single measurement method. Laser sensor 31 is used to provide high-precision distance measurement data, while camera 32 is used to provide shape information of the wheel profile. For example, laser sensor 31 provides high-precision distance measurement, which is suitable for wheel rut surfaces with complex shapes, while camera 32 provides shape information of the rut surface, enabling the detection of defects and wear on the wheel surface.

[0074] The controller 6 is located inside the seat 1 and is connected to the laser sensor 31 and the camera 32 for calculating the characteristic dimensions of the wheel.

[0075] Specifically, the controller 6 includes a central processing unit (CPU), a storage unit (memory and memory), an input interface, and an output interface. The CPU is responsible for performing various calculations and data processing tasks. The storage unit stores measurement data, program code, and intermediate calculation results. The input interface receives signals from the laser sensor 31 and the camera 32. The output interface outputs the calculation results to a display screen or storage device. The controller 6 receives signals from the laser sensor 31 and the camera 32 via the input interface. These signals are digital signals, containing distance data of the wheel rut surface (from the laser sensor 31) and image data (from the camera 32). The point cloud data from the laser sensor 31 and the rut surface data from the camera 32 are then fused to generate the wheel's feature dimensions. Finally, the calculated feature dimension data is output to the user interface on the display screen.

[0076] In some specific embodiments, the base 1 includes a base 11 and a protective cover 12. The laser sensor 31 and the camera 32 are detachably mounted on the base 11. The protective cover is detachably mounted on the base 11. The protective cover 12 is provided with a laser emission hole 121 corresponding to the emitting end of the laser sensor 31 and a photo capture port 122 corresponding to the shooting end of the camera 32. One end of the crossbar 21 is detachably mounted on the base 11.

[0077] Specifically, the base 11 provides a detachable mounting position for the laser sensor 31 and the camera 32. The laser sensor 31 and camera 32 are fixed to the base 11 via threads, snaps, or other mechanical structures, ensuring their stability and precise alignment. The base 11 is provided with a connecting structure for mounting a crossbar 21. The crossbar 21 is connected to the base 11 via threads, snaps, or other connection methods, providing support for the wheel positioning axle 22. The protective cover 12 is fixed to the base 11 via threads, snaps, or other quick-release structures, facilitating quick replacement or maintenance of internal components as needed. The laser emission port 121 on the protective cover 12 corresponds to the emitting end of the laser sensor 31, and the imaging port 122 corresponds to the imaging end of the camera 32, ensuring that the emitting end of the laser sensor 31 and the imaging end of the camera 32 can function normally without affecting the measurement function. Furthermore, the protective cover 12 protects the laser sensor 31 and camera 32 from collisions with foreign objects, preventing damage.

[0078] By assembling both the laser sensor 31 and the camera 32 onto the base 11 and securing them firmly with threads or snap-fit ​​structures, after the installation process is completed, the emitting end of the laser sensor 31 and the shooting end of the camera 32 are aligned with the through-hole of the protective cover 12 so that the laser beam and light can pass through without obstruction.

[0079] In a further embodiment, the base 11 is provided with two downward inclined surfaces 111, and the laser sensor 31 and the camera 32 are detachably disposed on each inclined surface 111.

[0080] Specifically, the two inclined surfaces 111 on the base 11 are designed to optimize the mounting angles of the laser sensor 31 and the camera 32, enabling them to better align with the wheel rut surface and improve measurement accuracy and efficiency. Since the laser sensor 31 needs to emit a laser beam at a specific angle to ensure accurate illumination of all parts of the wheel rut surface and effective reception of reflected light, the inclined surfaces 111 limit the emission angle of the laser sensor 31 and the shooting angle of the camera 32 to designated angles. When each wheel positioning shaft 22 is simultaneously attached to the wheel, the laser sensor 31 forms the optimal incident and reflection angles with the wheel rut surface. Additionally, the camera 32 needs to capture images of the wheel rut surface at a suitable angle to ensure clear images that completely cover the wheel rut surface.

[0081] In some specific embodiments, the base 1 is provided with a touch screen display 4, which is signal-connected to the controller 6.

[0082] Specifically, the touch screen 4 displays the data and calculation results collected by the real-time display measuring device, providing users with intuitive feedback. For example, the touch screen 4 can display the characteristic dimensions of the wheel in real time, such as wheel diameter, flange thickness, and rut surface shape. This data is displayed in numerical form, making it convenient for users to read quickly. In addition, the screen can also display images of the wheel rut surface taken by the camera 32, allowing users to intuitively observe the appearance of the wheel and the details of the rut surface through the images.

[0083] The touch screen 4 can display measurement data and operation interface in real time, and can also monitor the status of the measurement process in real time to ensure the smooth progress of the measurement. It also provides data storage and management functions, making it convenient for users to record and analyze measurement data.

[0084] In some specific embodiments, the base 1 is also provided with a start component 5, which is signal-connected to the controller 6.

[0085] Specifically, the starting component 5 is a start button, a physical button used by the user to manually trigger the measurement process. Each time the user presses the start button, the starting component 5 detects the button pressing action. After the circuit inside the starting component 5 detects the button pressing, it generates a start signal. The start signal is sent to the controller 6 through the signal line. After receiving the start signal, the controller 6 identifies the signal through its internal signal processing unit and prepares to start the measurement process. After receiving the start signal, the controller 6 sends a start command to the laser sensor 31 and the camera 32. Subsequently, after receiving the start command, the laser sensor 31 starts to emit a laser beam and prepares to receive the reflected light signal. After receiving the start command, the camera 32 starts to capture images of the wheel rut surface and transmits the image data to the controller 6.

[0086] In addition, the start-up component 5 also includes a switch button, and the base 11 is equipped with a power supply. When the user presses the switch button, the button's mechanical structure (such as a microswitch) is triggered, forming a closed circuit and generating a low-level or high-level signal. The generated electrical signal is sent to the controller 6 through the signal line. After receiving the power-on signal, the controller 6 starts the power supply of the entire measuring device. That is, the controller 6 sends a command to the power supply to start the power supply, providing power to components such as the laser sensor 31, camera 32, and display screen, ensuring that all components can work normally.

[0087] In some specific embodiments, the controller 6 is equipped with a wireless signal transmitter 7, which is used to upload wheel size data to the control terminal 8.

[0088] Specifically, the wireless signal transmitter 7 includes a data processing module, a wireless communication module, a data interface, and an antenna. The wireless communication module is responsible for transmitting and receiving wireless signals. The wireless communication module can utilize technologies such as Wi-Fi, Zigbee, LTE, and 5G. It is understood that the data processing module is the controller 6 in this embodiment of the invention, connected to the data processing module via the data interface to receive calculated wheel size data (such as wheel diameter, flange thickness, and rut shape). The antenna is used to enhance the transmission range and stability of the wireless signal. During the uploading process, the wireless transmitter encapsulates the data into wireless signals according to a preset communication protocol (such as TCP / IP, MQTT, etc.), and then transmits this data wirelessly to the control terminal 8. The control terminal 8 records this data for subsequent analysis and calculation.

[0089] In some specific embodiments, the crossbar 21 is provided with two positioning cavities 211, and one end of each wheel positioning axle 22 is provided with a connecting part 221. Each connecting part 221 is detachably disposed in the corresponding positioning cavity 211, and the outer side of the connecting part 221 is transitionally fitted with the cavity wall of the positioning cavity 211.

[0090] Specifically, the positioning cavity 211 is a groove or hole on the crossbar 21 for mounting the wheel positioning shaft 22. It is cylindrical or has another shape suitable for the positioning shaft. Each positioning cavity 211 provides an installation position for the wheel positioning shaft 22. The stability and precise positioning of the positioning shaft are ensured through the fit between the cavity wall of the positioning cavity 211 and the connecting part 221. The cavity wall of the positioning cavity 211 and the outer side of the connecting part 221 adopt a transition fit. This fit ensures that the connecting part 221 can fit tightly against the cavity wall while allowing for a certain degree of freedom in assembly and disassembly. The connecting part 221 is cylindrical and matches the shape of the positioning cavity 211. Through its fit with the positioning cavity 211, the connecting part 221 enables the detachable installation of the wheel positioning shaft 22 and ensures the stability of the positioning shaft during measurement. The transition fit between the outer side of the connecting part 221 and the cavity wall of the positioning cavity 211 allows the connecting part 221 to be smoothly inserted into the positioning cavity 211 during assembly, while maintaining a tight fit during operation, reducing shaking and errors.

[0091] During assembly, the user aligns the connecting part 221 of the wheel positioning shaft 22 with the positioning cavity 211 and inserts it directly. Due to the transition fit, the connecting part 221 can smoothly enter the positioning cavity 211 and fit tightly against the cavity wall. After the connecting part 221 is inserted into the positioning cavity 211, the user can further fix the wheel positioning shaft 22 in the positioning cavity 211 by threads, snaps or other fixing methods. In this way, when the user aligns the measuring device with the wheel, the other ends of the two wheel positioning shafts 22 are respectively attached to the wheel flange or rut surface. The tight fit between the two wheel positioning shafts 22 and the wheel ensures the stability of the measuring device and the accuracy of the measurement.

[0092] Specifically, the positioning cavity 211 is provided with a locking hole 212, and the connecting part 221 is provided with a fixing hole 222; the size measuring device also includes a locking member, which is detachably inserted into both the locking hole 212 and the fixing hole 222.

[0093] Specifically, locking holes 212 are provided on the cavity wall of positioning cavity 211, located on the side of positioning cavity 211, facilitating the insertion and operation of locking components. Locking holes 212 cooperate with locking components to securely lock the connecting portion 221 of wheel positioning shaft 22 within positioning cavity 211 through insertion and fixation. Fixing holes 222 are provided on the connecting portion 221 of wheel positioning shaft 22, corresponding to locking holes 212, facilitating the insertion of locking components. Fixing holes 222 cooperate with locking components to securely lock the connecting portion 221 within positioning cavity 211 through insertion and fixation. The shape and size of fixing holes 222 match locking holes 212, ensuring smooth insertion and reliable fixation of locking components. By simultaneously inserting locking components into locking holes 212 and fixing holes 222, the connecting portions 221 of each wheel positioning shaft 22 are securely fixed within the corresponding positioning cavity 211, ensuring the stability of the wheel positioning shaft 22 during measurement.

[0094] For example, during installation, the user aligns the connecting part 221 of the wheel positioning shaft 22 with the positioning cavity 211 and gently inserts it. Due to the transition fit, the connecting part 221 can smoothly enter the positioning cavity 211 and fit tightly against the cavity wall. The user aligns the locking member with the locking hole 212 of the positioning cavity 211 and the fixing hole 222 of the connecting part 221, inserts and fixes the locking member. With this setup, the user aligns the measuring device with the wheel, so that the other ends of the two wheel positioning shafts 22 are respectively attached to the wheel flange or rut surface. The positioning shafts maintain a stable positional relationship through the fixing of the locking member, ensuring the stability of the measuring device. Conversely, during disassembly, the user loosens the locking member to release the fixed connection between the wheel positioning shaft 22 and the positioning cavity 211. Then, the user only needs to gently pull out the connecting part 221 of the wheel positioning shaft 22 and remove it from the positioning cavity 211. Because the two are in a transition fit, the connecting part 221 can be easily pulled out, facilitating replacement or maintenance.

[0095] It is understood that the fixing hole 222 in this embodiment of the present invention is a threaded hole and the locking member is a bolt. By inserting the bolt into the threaded hole, the bolt engages with the threaded hole to fix the positioning shaft 22 of each wheel.

[0096] In some specific embodiments, the two wheel positioning shafts 22 are symmetrically arranged and at the same height.

[0097] Specifically, the two wheel positioning shafts 22 are symmetrically arranged, which makes the force on the measuring device uniform on both sides of the wheel. This arrangement reduces measurement errors caused by asymmetry and ensures that the measuring device remains stable during operation. Moreover, the symmetrical arrangement of the two wheel positioning shafts 22 makes the weight distribution of the measuring device uniform on both sides of the wheel, reducing swaying caused by center of gravity shift and improving measurement stability. In addition, the two wheel positioning shafts 22 are set at the same height, ensuring that the contact points between the two wheel positioning shafts 22 and the wheel are on the same horizontal plane. By using horizontal alignment, measurement errors caused by height differences are reduced, ensuring that the laser sensor 31 and camera 32 can be accurately aligned with the wheel rut surface. Furthermore, the same height ensures that the contact points between the two wheel positioning shafts 22 and the wheel are on the same horizontal plane, reducing measurement errors caused by height differences and improving measurement consistency.

[0098] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A wheel size measuring device, characterized in that, The dimension measuring device includes: seat body; A positioning assembly, comprising a crossbar and two wheel positioning axles, one end of the crossbar being detachably mounted on the seat, and the two wheel positioning axles being spaced apart from the crossbar; The measuring component includes a laser sensor and a camera, both of which are detachably mounted on the base. The emitting end of the laser sensor and the shooting end of the camera are both facing the rut surface of the wheel, and the laser measurement point emitted by the laser sensor toward the rut surface is located within the shooting range of the camera. A controller, disposed within the seat and connected to the laser sensor and the camera signal, is used to calculate the characteristic dimensions of the wheel.

2. The wheel size measuring device according to claim 1, characterized in that, The base includes a base and a protective cover. The laser sensor and the camera are detachably mounted on the base. The protective cover is detachably mounted on the base. The protective cover has a laser emission hole corresponding to the emitting end of the laser sensor and a photo capture port corresponding to the shooting end of the camera. One end of the crossbar is detachably mounted on the base.

3. The wheel size measuring device according to claim 1, characterized in that, The base is equipped with a touch screen display, which is signal-connected to the controller.

4. The wheel size measuring device according to claim 1, characterized in that, The base is also provided with a start-up component, which is signal-connected to the controller.

5. The wheel size measuring device according to claim 1, characterized in that, The controller is equipped with a wireless signal transmitter.

6. The wheel size measuring device according to claim 1, characterized in that, The crossbar is provided with two positioning cavities, and one end of each wheel positioning axle is provided with a connecting part, and each connecting part is detachably disposed in the corresponding positioning cavity.

7. The wheel size measuring device according to claim 6, characterized in that, The positioning cavity is provided with a locking hole, and the connecting part is provided with a fixing hole; The dimensional measuring device also includes a locking element, which is detachably inserted into both the locking hole and the fixing hole.

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