Brush set device with automatic bristle length measuring function and car washing machine

Abstract

The utility model relates to a brush set device with a bristle length automatic measuring function and a car washing machine. The brush set device comprises a brush set mechanism, the brush set mechanism comprises a brush set support, a brush set rotating shaft and bristles, the brush set rotating shaft is rotationally connected with the brush set support, and the bristles are arranged on the brush set rotating shaft; the detection mechanism comprises a driving assembly and a detection assembly, the driving assembly is arranged on the brush set support, the driving assembly is in driving connection with the detection assembly, the driving assembly is configured to drive the detection assembly to move relative to the brush set rotating shaft, and the detection assembly is configured to be used for detecting the distance between the tail end of the bristles and the surface of the brush set rotating shaft. According to the brush group device, the brush group mechanism is matched with the detection mechanism, the length of the bristles can be automatically measured on line without shutdown, the detection efficiency is high, the detection result is accurate, and low efficiency and safety risks of a manual measurement mode can be avoided.

Description

Technical Field

[0001] This application relates to the field of car wash equipment technology, and in particular to a brush assembly device and car wash machine with automatic bristle length measurement function. Background Technology

[0002] Car wash brush sets typically consist of multiple types of brushes, each responsible for cleaning different parts of the vehicle. Their main function is to clean the vehicle's surface and reduce the risk of scratches. In related technologies, when the brush bristles show wear, their length is usually determined manually to decide whether to replace the bristles or adjust the brush set's position. However, car wash machines are online devices and cannot monitor bristle length in real time. Therefore, measuring bristle length requires stopping the machine and manual operation. Stopping the machine for inspection significantly reduces equipment utilization and cleaning efficiency, and also poses certain safety risks. Utility Model Content

[0003] Therefore, it is necessary to provide a brush assembly device and a car wash machine with automatic brush length measurement function to address the problems of cumbersome brush bristle length measurement process, low measurement efficiency, and safety risks in car wash machine brush assembly.

[0004] A brush assembly device with automatic bristle length measurement function, the brush assembly device comprising:

[0005] A brush assembly mechanism, comprising a brush assembly bracket, a brush assembly shaft, and brush bristles, wherein the brush assembly shaft is rotatably connected to the brush assembly bracket, and the brush bristles are disposed on the brush assembly shaft;

[0006] The detection mechanism includes a drive component and a detection component. The drive component is disposed on the brush assembly bracket and is drivenly connected to the detection component. The drive component is configured to drive the detection component to move relative to the brush assembly shaft. The detection component is configured to detect the distance between the bristle tip and the surface of the brush assembly shaft.

[0007] In one embodiment, the detection component includes a first detection component and a second detection component. The first detection component is connected to the output end of the drive component and is configured to detect the position of the bristle tip. The second detection component is connected to the first detection component and is configured to detect the distance between the first detection component and the surface of the brush assembly shaft.

[0008] In one embodiment, the first detection component includes a photoelectric sensor, the center line of the illumination light of the photoelectric sensor being arranged parallel to the axial direction of the brush assembly shaft.

[0009] In one embodiment, the second detection component includes a mounting base and a pull rope sensor. The mounting base is fixedly connected to the drive assembly. The pull rope sensor includes a sensor body and a pull rope head. The sensor body is connected to the first detection component, and the pull rope head is connected to the mounting base.

[0010] In one embodiment, the sensor body, the pull rope head, and the first detection component are located on the same straight line.

[0011] In one embodiment, the second detection component includes a magnetic scale and a magnetic scale reading head. The magnetic scale is connected to the drive assembly and extends radially along the brush assembly shaft. The magnetic scale reading head is slidably connected to the magnetic scale and is connected to the first detection component. Alternatively, the second detection component includes an optical scale and an optical scale reading head. The optical scale is connected to the drive assembly and extends radially along the brush assembly shaft. The optical scale reading head is slidably connected to the optical scale and is connected to the first detection component.

[0012] In one embodiment, the drive assembly includes a linear module and a movable component. The linear module extends radially along the brush assembly axis and is drivenly connected to the movable component. The linear module is configured to drive the movable component to move linearly along the brush assembly axis. The first detection component is connected to the movable component.

[0013] In one embodiment, the driving assembly includes a drive motor, a guide rail, and a slider. The drive motor and the guide rail are mounted on the brush assembly bracket. The slider is slidably connected to the guide rail. The drive motor is driven by the slider. The drive motor has a built-in displacement encoder, which is electrically connected to the drive motor. The detection assembly is connected to the slider.

[0014] In one embodiment, the detection mechanism further includes a mounting bracket, one end of which is connected to the output end of the drive component, and the other end of which is connected to the detection component.

[0015] A car wash machine, the car wash machine including a brush assembly device with automatic bristle length measurement function as described in any of the above.

[0016] The aforementioned brush assembly device and car wash machine with automatic bristle length measurement function are described above. The car wash machine includes a brush assembly device with automatic bristle length measurement function. This brush assembly device includes a brush assembly mechanism and a detection mechanism. Even when the brush assembly device is in the process of washing a vehicle, the drive component of the detection mechanism can still drive the detection component to move, thereby automatically detecting the bristle length. Therefore, the brush assembly device can automatically measure the bristle length online without stopping the machine by utilizing the brush assembly mechanism and the detection mechanism in conjunction. This results in high detection efficiency and accurate detection results, avoiding the inefficiency and safety risks of manual measurement. Furthermore, the detection data can be transmitted to the car wash machine control system in real time, providing a basis for brush assembly position adjustment or bristle replacement, thus improving car wash efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a brush assembly device with automatic bristle length measurement function according to an embodiment of this application.

[0018] Figure 2 for Figure 1 A front view schematic diagram of a brush assembly device with automatic bristle length measurement function.

[0019] Figure 3 This is a schematic diagram of a brush assembly device with automatic bristle length measurement function according to another embodiment of this application.

[0020] Figure 4 for Figure 3 A front view schematic diagram of a brush assembly device with automatic bristle length measurement function.

[0021] Figure 5 This is a schematic diagram of a brush assembly device with automatic bristle length measurement function according to another embodiment of this application.

[0022] Figure 6 for Figure 5 A front view schematic diagram of a brush assembly device with automatic bristle length measurement function.

[0023] Figure 7 This is a front view of a brush assembly device with automatic bristle length measurement function according to another embodiment of this application.

[0024] Figure 8 for Figure 7 A top view of the brush assembly device with automatic bristle length measurement function.

[0025] Icon labels:

[0026] 10. Brush assembly;

[0027] 100. Brush assembly mechanism; 110. Brush assembly bracket; 120. Brush assembly pivot; 130. Brush bristles;

[0028] 200. Detection mechanism; 210. Drive assembly; 211. Linear module; 212. Moving part; 213. Drive motor; 214. Guide rail; 215. Slider; 220. Detection assembly; 221. First detection component; 222. Second detection component; 222a. Mounting base; 222b. Sensor body; 222c. Pull rope head; 222d. Magnetic scale; 222e. Magnetic scale reading head; 230. Mounting bracket. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are 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 at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] This application provides a car wash machine, which includes a brush assembly 10 with an automatic bristle length measurement function. The brush assembly 10 can be used to clean different parts of a vehicle. For example, it can be used as a side brush assembly to clean the sides of the vehicle; or as an end brush assembly to clean the front of the vehicle. Based on the structural design of the brush assembly 10, the car wash machine of this application can automatically detect the bristle length data online through the brush assembly 10. The detection result can be fed back to the car wash machine control terminal in real time, thereby providing a basis for real-time adjustment of the bristle feed rate, allowing for the replacement of bristles 130 of appropriate length or adjustment of the brush assembly position, thereby improving cleaning efficiency and enhancing safety.

[0036] See Figure 1 and Figure 2The diagram shows a schematic of the structure of a brush assembly device 10 with automatic bristle length measurement function in one embodiment of this application. The brush assembly device 10 provided in one embodiment of this application includes a brush assembly mechanism 100 and a detection mechanism 200. The brush assembly device 10 has an automatic bristle length measurement function.

[0037] The brush assembly mechanism 100 includes a brush assembly bracket 110, a brush assembly shaft 120, and brush bristles 130. The brush assembly shaft 120 is rotatably connected to the brush assembly bracket 110, and the brush bristles 130 are disposed on the brush assembly shaft 120. Specifically, the brush assembly bracket 110 can be fixed to the car wash machine frame, and the brush assembly shaft 120 is rotatably connected to the brush assembly bracket 110 through bearings and is driven to rotate by the motor of the car wash machine. A plurality of brush bristles 130 are disposed on the outer periphery of the brush assembly shaft 120, each brush bristle 130 being arranged in a straight line and extending radially along the brush assembly shaft 120.

[0038] The detection mechanism 200 includes a drive component 210 and a detection component 220. The drive component 210 is mounted on the brush assembly support 110 and is driven to the detection component 220. The drive component 210 is configured to drive the detection component 220 to move relative to the brush assembly shaft 120. The detection component 220 is configured to detect the distance between the tip of the bristles 130 and the surface of the brush assembly shaft 120. Specifically, the drive component 210 can be fixed to the top of the brush assembly support 110, and its output end is connected to and fixed to the detection component 220. The drive component 210 can drive the detection component 220 to move radially along the brush assembly shaft 120, so that the detection component 220 moves closer to or further away from the bristles 130, thereby allowing the detection component 220 to detect the real-time length of the bristles 130. It should be noted that, in the embodiments of this application, the length of the bristles 130 refers to the distance between the end of the bristles 130 and the surface of the brush assembly shaft 120 along the extension direction of the bristles 130, wherein the end of the bristles 130 refers to the end of the bristles 130 that is away from the surface of the brush assembly shaft 120.

[0039] Through the above structural design, even when the brush assembly 10 is in the process of washing a vehicle, the drive component 210 of the detection mechanism 200 can still drive the detection component 220 to move, thereby automatically detecting the length of the brush bristles 130. Therefore, the brush assembly 10 with automatic bristle length measurement function of this embodiment can automatically measure the length of the brush bristles 130 online without stopping the machine, utilizing the brush assembly mechanism 100 and the detection mechanism 200 in cooperation. This results in high detection efficiency and accurate detection results, avoiding the inefficiency and safety risks of manual measurement. Furthermore, the detection data can be transmitted to the car wash machine control system in real time, providing a basis for brush assembly position adjustment or brush bristle 130 replacement, thus improving car wash efficiency.

[0040] See Figure 2As shown, in some embodiments, the detection component 220 includes a first detection component 221 and a second detection component 222. The first detection component 221 is connected to the output terminal of the drive component 210 and is configured to detect the position of the bristle tip 130. For example, the first detection component 221 may include a photoelectric sensor, which is driven to move by the drive component 210, thereby enabling the photoelectric sensor to detect the real-time position of the bristle tip 130. The second detection component 222 is connected to the first detection component 221 and is configured to detect the distance between the first detection component 221 and the surface of the brush assembly shaft 120. Thus, by determining the position of the bristle tip 130 through the first detection component 221 and the distance between the first detection component 221 and the surface of the brush assembly shaft 120 through the second detection component 222, the distance between the bristle tip 130 and the surface of the brush assembly shaft 120 can be obtained, i.e., the bristle length data can be obtained, which helps to improve measurement accuracy.

[0041] Furthermore, in some embodiments, the first detection component 221 includes a photoelectric sensor with a fast response speed, which can work in conjunction with the high-speed rotation of the brush bristles 130 to achieve dynamic real-time measurement, meeting the continuous operation requirements of the car wash machine. The illumination light outlet of the photoelectric sensor faces the direction of the brush bristles 130, ensuring that the illumination light can cover the full width of the brush bristles 130 during the movement of the photoelectric sensor. The center line of the illumination light of the photoelectric sensor is set parallel to the axis of the brush assembly shaft 120, which can avoid length measurement deviation caused by the tilt of the detection angle and facilitate the calculation of the length of the brush bristles 130. Specifically, when calculating the length of the brush bristles 130, the distance between the photoelectric sensor and the surface of the brush assembly shaft 120 in the initial state is first measured and recorded as the first distance. Then, the photoelectric sensor is driven to move relative to the brush assembly shaft 120 by the drive component 210. When the photoelectric sensor detects the end of the brush bristles 130, the critical state at this time is when the photoelectric sensor changes from a high level to a low level. Then, the displacement of the photoelectric sensor in the critical state and in the initial state is detected by the second detection component 222 and recorded as the second distance. The second spacing is added to the first spacing to obtain the spacing between the photoelectric sensor and the surface of the brush assembly shaft 120 when the photoelectric sensor is in a critical state, which is the length of the brush bristles 130.

[0042] Continue reading Figure 2As shown, in some embodiments, the second detection component 222 includes a mounting base 222a and a pull-cord sensor, which acquires the position signal of the first detection component 221. Specifically, the mounting base 222a is fixedly connected to the drive assembly 210. For example, the mounting base 222a can be a plate-like structure extending axially along the brush assembly shaft 120, and the mounting base 222a is fixedly connected to the drive assembly 210 by bolts. The pull-cord sensor includes a sensor body 222b and a pull-cord head 222c. The sensor body 222b is connected to the first detection component 221 and can move with the first detection component 221. The pull-cord head 222c is connected to the mounting base 222a, thereby remaining fixed to the drive assembly 210 and causing the pull-cord to be radially tensioned along the brush assembly shaft 120. When the drive assembly 210 drives the first detection component 221 to move radially along the brush assembly shaft 120, the sensor body 222b moves with the first detection component 221. At this time, the extension length of the pull rope can reflect the real-time displacement of the first detection component 221, and the length of the brush bristles 130 in the current state can be calculated. The pull rope sensor in this embodiment uses mechanical contact measurement, has strong anti-interference ability, is suitable for the complex environment of car wash machines that are humid and wet, and has low cost and convenient maintenance, showing good application prospects.

[0043] Furthermore, in some embodiments, the sensor body 222b, the pull cord head 222c, and the first detection component 221 are located on the same straight line, and this straight line coincides with the radial direction of the brush assembly shaft 120. The drive assembly 210 drives the first detection component 221 and the sensor body 222b to move along the aforementioned straight line. This helps reduce the shaking of the detection assembly 220 during the car wash process, avoids detection errors caused by skewed detection direction, and improves the accuracy of the detection results.

[0044] Of course, in other alternative embodiments, the straight line between the sensor body 222b and the pull cord head 222c may also have a slight deviation from the radial direction of the brush assembly shaft 120. For example, in some cases where accurate measurement is not required, an angle of <3° between the straight line between the sensor body 222b and the pull cord head 222c and the radial direction of the brush assembly shaft 120 is allowed. In this case, the approximate length of the bristles 130 can still be basically detected to meet the requirements of rough detection.

[0045] See Figure 3 and Figure 4As shown, in some embodiments, the second detection component 222 includes a magnetic scale 222d and a magnetic scale reading head 222e, which acquires the position signal of the first detection component 221. Specifically, the magnetic scale 222d is connected to and fixed to the drive assembly 210. The magnetic scale 222d extends radially along the brush assembly shaft 120 to guide the magnetic scale reading head 222e, allowing the magnetic scale reading head 222e and the first detection component 221 to move radially along the brush assembly shaft 120. The magnetic scale reading head 222e is slidably connected to the magnetic scale 222d and is connected to the first detection component 221 to remain fixed. As the magnetic scale reading head 222e moves with the first detection component 221, it reads the scale of the magnetic scale 222d, thereby obtaining the real-time displacement of the first detection component 221. Therefore, non-contact detection can be achieved through the magnetic scale 222d and the magnetic scale reading head 222e, avoiding mechanical contact wear and extending the life of the second detection component 222. Furthermore, the magnetic scale 222d and the magnetic scale reading head 222e can achieve high-precision detection, meeting the precise monitoring requirements of high-end car wash machines for brush bristle wear, such as in scenarios involving the cleaning of sensitive paint surfaces on luxury vehicles.

[0046] Optionally, the second detection component 222 includes a grating ruler and a grating reading head. The grating ruler is connected to the drive assembly 210 and extends radially along the brush assembly shaft 120. The grating reading head is slidably connected to the grating ruler and connected to the first detection component 221. In this embodiment, the grating ruler is installed in the same way as the magnetic grating ruler 222d, and the grating reading head uses the principle of optical diffraction to detect the displacement of the first detection component 221 in real time.

[0047] In some embodiments, the drive assembly 210 includes a linear module 211 and a movable component 212. The linear module 211 extends radially along the brush assembly shaft 120 and is drivenly connected to the movable component 212. The linear module 211 is configured to drive the movable component 212 to perform linear motion along the brush assembly shaft 120. A first detection component 221 is connected to the movable component 212. Specifically, the linear module 211 may include a linear motor. The stator of the linear motor is connected to the brush assembly support 110 and extends radially along the brush assembly shaft 120. The mover of the linear motor is connected to the movable component 212 to drive the movable component 212 to perform linear motion along the brush assembly shaft 120. The first detection component 221 is mounted on the movable component 212 of the linear module 211 so that the detection range of the first detection component 221 can completely cover the sweeping contour when the bristles 130 rotate, thereby improving detection accuracy. Furthermore, the movement speed of the linear module 211 can be adjusted according to actual detection needs, achieving the optimal balance between efficiency and accuracy.

[0048] It is understandable that, in order to further improve the accuracy of the test results, the process of detecting the length of the bristles 130 can be completed before and after the cleaning operation. For example, the detection process may include: the brush assembly 10 swings out → the motor of the brush assembly shaft 120 starts to drive the bristles 130 to rotate → the drive assembly 210 drives the detection assembly 220 to move and record the length of the bristles 130 → the train enters the depot for cleaning operation → the cleaning operation is completed → the brush drive assembly 210 drives the detection assembly 220 to move and record the length of the bristles 130 again → the motor of the brush assembly shaft 120 stops working to stop the bristles 130 from rotating → the brush assembly 10 swings back to its initial position. Therefore, by detecting the length of the bristles 130 before and after the cleaning operation, the impact of dynamic impact during the cleaning process on the test results can be reduced, thereby accurately obtaining the wear amount of the bristles 130 for replacement.

[0049] See Figure 5 and Figure 6 As shown, in some embodiments, the drive assembly 210 includes a drive motor 213, a guide rail 214, and a slider 215. The drive motor 213 and the guide rail 214 are mounted on the brush assembly support 110, with the guide rail 214 extending radially along the brush assembly shaft 120. For example, the drive motor 213 can be a servo motor, and the guide rail 214 can be a lead screw. The slider 215 is slidably connected to the guide rail 214, and the drive motor 213 is drivenly connected to the slider 215. The drive motor 213 has a built-in displacement encoder, which is electrically connected to the drive motor 213. The detection assembly 220 is connected to the slider 215, and in this case, the detection assembly 220 may only include a photoelectric sensor. When the drive motor 213 drives the slider 215 and the detection assembly 220 to slide along the guide rail 214, the displacement encoder can record the displacement of the slider 215 in real time, thereby obtaining the real-time displacement of the detection assembly 220 for accurate calculation of the bristle length 130. Furthermore, the displacement encoder can detect whether the displacement of the drive assembly 210 is abnormal in real time, improving reliability.

[0050] See Figure 7 and Figure 8 As shown, in some embodiments, the detection mechanism 200 further includes a mounting bracket 230, one end of which is connected to the output end of the drive assembly 210, and the other end of which is connected to the detection assembly 220. For example, the mounting bracket 230 can be configured to be inclined to the axial and radial directions of the brush assembly shaft 120. In this case, the detection assembly 220 extends a certain distance along the axial or radial direction of the brush assembly shaft 120, so that the detection assembly 220 can extend to a position far from the drive assembly 210. Therefore, the detection mechanism 200 of this embodiment can detect the length of some brush bristles 130 with irregular arrangements, for example, it can be used in the contour brush assembly of a car wash machine, and has a wider range of application prospects.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A brush assembly device with automatic bristle length measurement function, characterized in that, The brush assembly includes: A brush assembly mechanism, comprising a brush assembly bracket, a brush assembly shaft, and brush bristles, wherein the brush assembly shaft is rotatably connected to the brush assembly bracket, and the brush bristles are disposed on the brush assembly shaft; The detection mechanism includes a drive component and a detection component. The drive component is disposed on the brush assembly bracket and is drivenly connected to the detection component. The drive component is configured to drive the detection component to move relative to the brush assembly shaft. The detection component is configured to detect the distance between the bristle tip and the surface of the brush assembly shaft.

2. The brush assembly device with automatic bristle length measurement function according to claim 1, characterized in that, The detection component includes a first detection component and a second detection component. The first detection component is connected to the output end of the drive component and is configured to detect the position of the bristle tip. The second detection component is connected to the first detection component and is configured to detect the distance between the first detection component and the surface of the brush assembly shaft.

3. The brush assembly device with automatic bristle length measurement function according to claim 2, characterized in that, The first detection component includes a photoelectric sensor, and the center line of the illumination light of the photoelectric sensor is arranged parallel to the axial direction of the brush assembly shaft.

4. The brush assembly device with automatic bristle length measurement function according to claim 2, characterized in that, The second detection component includes a mounting base and a pull rope sensor. The mounting base is fixedly connected to the drive assembly. The pull rope sensor includes a sensor body and a pull rope head. The sensor body is connected to the first detection component, and the pull rope head is connected to the mounting base.

5. The brush assembly device with automatic bristle length measurement function according to claim 4, characterized in that, The sensor body, the pull rope head, and the first detection component are located on the same straight line.

6. The brush assembly device with automatic bristle length measurement function according to claim 2, characterized in that, The second detection component includes a magnetic scale and a magnetic scale reading head. The magnetic scale is connected to the drive assembly and extends radially along the brush assembly shaft. The magnetic scale reading head is slidably connected to the magnetic scale and is also connected to the first detection component; or The second detection component includes a grating ruler and a grating reading head. The grating ruler is connected to the drive assembly and extends radially along the brush assembly shaft. The grating reading head is slidably connected to the grating ruler and is connected to the first detection component.

7. The brush assembly device with automatic bristle length measurement function according to any one of claims 2-6, characterized in that, The drive assembly includes a linear module and a movable component. The linear module extends radially along the brush assembly axis and is drivenly connected to the movable component. The linear module is configured to drive the movable component to move linearly along the radial direction of the brush assembly axis. The first detection component is connected to the movable component.

8. The brush assembly device with automatic bristle length measurement function according to claim 1, characterized in that, The driving assembly includes a drive motor, a guide rail, and a slider. The drive motor and the guide rail are mounted on the brush assembly bracket. The slider is slidably connected to the guide rail. The drive motor is driven by the slider. The drive motor has a built-in displacement encoder, which is electrically connected to the drive motor. The detection assembly is connected to the slider.

9. The brush assembly device with automatic bristle length measurement function according to claim 1, characterized in that, The detection mechanism also includes a mounting bracket, one end of which is connected to the output end of the drive component, and the other end of which is connected to the detection component.

10. A car wash machine, characterized in that, The car wash machine includes a brush assembly device with automatic bristle length measurement function as described in any one of claims 1-9.

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