A brush fatigue testing device and method

Abstract

The application belongs to the technical field of testing devices, and relates to a brush fatigue testing device and method. The device comprises a rack, a motion conversion assembly, a sliding installation assembly, a driving assembly and a baffle assembly connected with the rack. The driving assembly is used for providing rotary power for the motion conversion assembly. One end of the motion conversion assembly is connected with the driving assembly, and the other end is connected with the sliding installation assembly. The motion conversion assembly is used for converting the rotary power into linear reciprocating motion. The baffle assembly is arranged at intervals with the sliding installation assembly. The brush fatigue testing device and method provided by the application effectively solve the problems of high cost, long cycle, low efficiency and weak data pertinence in the prior art through structural design and test principle optimization.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and more specifically, to a brush fatigue testing device and method. Background Technology

[0002] Currently, fatigue testing of brushes in the industry typically employs vibration testing, following the standard procedure of Method 204 "High-Frequency Vibration Test" in GJB360B-2009. This method simulates the vibration environment under actual operating conditions and observes whether the brush exhibits fatigue damage or breakage after the test, thus providing a preliminary assessment of the brush's fatigue performance. While this method can meet basic reliability screening requirements during the performance verification stage of finished sensors and potentiometers, its limitations become increasingly apparent when applied to brush refresh material verification or performance boundary assessment scenarios. It struggles to meet the core requirements of testing efficiency and cost control during the R&D phase.

[0003] Existing vibration testing methods have several shortcomings: First, the pre-testing costs are high and the cycle is long, requiring the brushes to be assembled into complete sensor or potentiometer products before testing can be carried out, which consumes a lot of time and materials in the product manufacturing stage alone; second, the testing resources are highly dependent, requiring the use of dedicated vibration testing equipment, which is not only expensive to purchase and maintain, but also generally scarce in the industry, easily leading to queuing and waiting, further extending the testing cycle; third, the testing efficiency is low, with a single vibration test typically only able to test 1-3 finished products, making it impossible to achieve simultaneous testing of batches of brushes, making it difficult to quickly accumulate sufficient reliability data, which seriously restricts the progress of brush refresh material research and development and performance optimization.

[0004] In summary, existing brush fatigue testing technologies suffer from low testing efficiency due to their reliance on complete product manufacturing, dedicated vibration equipment, and single small-batch testing, and cannot support the needs of brush refresh material verification, performance boundary assessment, and R&D iteration. Summary of the Invention

[0005] This invention provides a brush fatigue testing device and method, the purpose of which is to solve the problem of low efficiency caused by the reliance on complete product manufacturing, dedicated vibration equipment and single small-batch testing in the prior art.

[0006] The technical solution of the present invention is as follows:

[0007] According to one aspect of the present invention, a brush fatigue testing apparatus is provided, comprising:

[0008] A brush fatigue testing device includes: a frame, a motion conversion component, a sliding mounting component, and a drive component and a baffle assembly, both connected to the frame. The drive component provides rotational power to the motion conversion component. One end of the motion conversion component is connected to the drive component, and the other end is connected to the sliding mounting component. The motion conversion component converts the rotational power into linear reciprocating motion. The baffle assembly is spaced apart from the sliding mounting component.

[0009] Furthermore, the frame includes a base plate, a front panel, a top panel, legs, side panels, and a rear panel; the front panel, side panels, and rear panel are all connected to the base plate, and the front panel, side panels, and rear panel are all connected to the top panel; the front panel, top panel, side panels, rear panel, and base plate together form a receiving cavity, and the drive assembly is located within the receiving cavity; the legs are installed at the bottom of the base plate; handles are installed on both sides of the frame.

[0010] Furthermore, the drive assembly includes a motor, a motor mounting base, a coupling, a bearing housing, and an eccentric shaft. The motor is connected to the frame via the motor mounting base, and the output end of the motor is connected to the eccentric shaft via the coupling. The bearing housing is connected to the front panel, and the eccentric shaft passes through the bearing housing.

[0011] Furthermore, the motion conversion assembly includes a transmission rod, both ends of which are provided with a rotating pair. One end of the transmission rod is rotatably connected to the eccentric shaft through the rotating pair, and the other end is rotatably connected to the sliding mounting assembly through the rotating pair.

[0012] Furthermore, the sliding mounting assembly includes a guide rail slider, a brush pressure plate, a brush mounting plate, a brush fixing plate, a quick-release locking mechanism, and a slider fixing plate. The guide rail slider is connected to the front panel, the slider fixing plate is slidably connected to the guide rail slider, and the guide rail slider is connected to the transmission rod through the rotating joint. The brush fixing plate is connected to the slider fixing plate through the quick-release locking mechanism. The brush mounting plate is used to mount the brush, and the brush mounting plate is locked to the brush fixing plate by the brush pressure plate.

[0013] Furthermore, the baffle assembly includes an adjustment platform, a mounting plate, and a baffle; the adjustment platform is mounted on the base plate and connected to the mounting plate, the adjustment platform being used to adjust the position of the mounting plate; the baffle is mounted on the mounting plate, and the mounting plate is provided with an elastic clamping plate, the elastic clamping plate being used to clamp the baffle.

[0014] According to another aspect of the present invention, a method for testing brush fatigue is provided, comprising the following steps:

[0015] S1. Measure the height H1 and pressure F0 of the brush before the test using a measuring mechanism to determine the relevant parameters of the brush fatigue test. The relevant parameters include the brush deformation ΔH, the test frequency f, and the number of tests m.

[0016] S2. Mount the brush to be tested on the sliding mounting assembly and adjust the position of the baffle assembly to set the brush deformation ΔH; at the same time, adjust the motor speed to set the test frequency f;

[0017] S3. Start the motor, so that the brushes, driven by the sliding mounting assembly, contact the baffle on the baffle assembly and reciprocate, perform a fatigue test, and record the motor running time to determine the number of tests m;

[0018] S4. After the test, the height H2 of the brush after maximum deformation during the brush test and the brush pressure F1 after the test are measured by the measuring mechanism. The brush deformation ΔH and brush pressure loss ΔF are calculated. At the same time, the number of times the motor runs when the brush breaks is recorded. The number of times the motor runs is the brush fatigue life.

[0019] Furthermore, the brush deformation ΔH = H1 - H2, where H1 is the brush height before the test and H2 is the height of the brush after maximum deformation during the test; the brush pressure damage ΔF = F0 - F1, where F0 is the brush pressure before the test and F1 is the brush pressure after the test.

[0020] Furthermore, in S2, by adjusting the position of the adjustment platform, the mounting plate and the baffle are moved to change the relative position of the baffle and the brush, thereby setting the brush deformation ΔH.

[0021] Furthermore, the relationship between the test frequency f and the motor operating speed n is f=60n, and the relationship between the number of tests m and the motor operating speed n and operating time t is m=nt.

[0022] The beneficial effects of this invention are as follows:

[0023] The brush fatigue testing apparatus and method provided by this invention, through structural design and optimized testing principles, effectively solves the problems of high cost, long cycle, low efficiency, and weak data specificity in existing brush fatigue testing technologies. It provides an efficient, economical, and reliable testing method for brush material research and product development; specifically as follows:

[0024] The device of this invention has a simple structure and replaces the expensive and scarce large-scale general-purpose vibration test bench. The device of this invention uses a stepper motor as a power source and converts the rotational motion into precise linear reciprocating motion through the "eccentric shaft-transmission rod" mechanism to simulate the vibration environment, effectively reducing the equipment investment cost and the test threshold.

[0025] Secondly, in terms of testing efficiency and throughput, the brush mounting plate in the sliding mounting assembly of the present invention, together with the quick-release locking component, can achieve rapid assembly and disassembly. Multiple batches of brush tests can be carried out in a short time by replacing the brush mounting plate, effectively shortening the testing cycle.

[0026] Furthermore, the device of the present invention, through a replaceable eccentric shaft and a precision baffle component adjustment mechanism, can accurately set and maintain the brush deformation ΔH during the test process. At the same time, the brush fixing plate simulates the actual installation angle, making the test conditions closer to the actual working conditions, and the obtained fatigue life, height and pressure loss data are more accurate. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the device structure provided by the present invention;

[0029] Figure 2 This is a front view of the rack provided by the present invention;

[0030] Figure 3 This is a side view of the rack provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the driving component provided by the present invention;

[0032] Figure 5 This is a schematic diagram of the motion conversion component provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the sliding mounting assembly provided by the present invention;

[0034] Figure 7 This is a schematic diagram of the baffle assembly provided by the present invention;

[0035] Figure 8 This is a schematic diagram of brush deformation provided by the present invention.

[0036] Legend:

[0037] 1-Frame; 11-Base plate; 12-Front panel; 13-Top panel; 14-Motor drive; 15-Support leg; 16-Handle; 17-Rear panel; 2-Drive assembly; 21-Motor; 22-Motor mounting base; 23-Coupling; 24-Bearing housing; 25-Eccentric shaft; 26-Limit nut; 3-Motion conversion assembly; 31-Transmission rod; 32-Rotating pair; 4-Sliding mounting assembly; 41-Guide rail slider; 42-Brush pressure plate; 43-Brush mounting plate; 44-Brush fixing plate; 45-Quick-rotor lock; 46-Slider fixing plate; 5-Baffle assembly; 51-Adjusting platform; 52-Mounting plate; 53-Baffle. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to 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 the invention.

[0040] Example 1

[0041] Please refer to the attached document as well. Figure 1-7 This embodiment provides a brush fatigue testing device, including:

[0042] The frame 1, motion conversion assembly 3, sliding mounting assembly 4, and drive assembly 2 and baffle assembly 5 are all connected to the frame 1. The drive assembly 2 is used to provide rotational power to the motion conversion assembly 3.

[0043] One end of the motion conversion component 3 is connected to the drive component 2 and the other end is connected to the sliding mounting component 4. The motion conversion component 3 is used to convert rotational power into linear reciprocating motion. The baffle component 5 is spaced apart from the sliding mounting component 4.

[0044] Furthermore, the frame 1 includes a base plate 11, a front panel 12, a top panel 13, legs 15, side panels, and a rear panel 17; the front panel 12, side panels, and rear panel 17 are all connected to the base plate 11, and the front panel 12, side panels, and rear panel 17 are all connected to the top panel 13; the front panel 12, top panel 13, side panels, rear panel 17, and base plate 11 enclose a receiving cavity, and the drive assembly 2 is located inside the receiving cavity; the legs 15 are installed at the bottom of the base plate 11; handles 16 are installed on both sides of the frame 1.

[0045] In addition to accommodating the drive assembly 2, the housing cavity of the frame 1 is also used to accommodate auxiliary electrical components such as the stepper motor power supply and driver; the combination design of the support leg 15 and the handle 16 further enhances the ease of movement and stability of the device, adapting to the usage requirements of different test sites.

[0046] Furthermore, the drive assembly 2 includes a motor 21, a motor mounting base 22, a coupling 23, a bearing housing 24, and an eccentric shaft 25. The motor 21 is connected to the frame 1 through the motor mounting base 22, and the output end of the motor 21 is connected to the eccentric shaft 25 through the coupling 23. The bearing housing 24 is connected to the front panel 12, and the eccentric shaft 25 passes through the bearing housing 24.

[0047] The motor 21 is a stepper motor, and the motor 21 is also equipped with a motor driver 14, which can not only drive the motor 21 to run, but also precisely control the running speed of the motor 21 by adjusting the output signal, thereby realizing the flexible adjustment of the test frequency. The motor driver is existing technology and will not be further explained here.

[0048] The bearing housing 24 is equipped with double bearings, and the eccentric shaft 25 passes through the double bearings; the double bearing structure of the bearing housing 24 can ensure the firm installation of the eccentric shaft 25, effectively reduce the clearance during the operation of the eccentric shaft 25, and avoid the impact of shaft shaking on the test accuracy.

[0049] Furthermore, the motion conversion assembly 3 includes a transmission rod 31, with a rotating pair 32 at both ends of the transmission rod 31. One end of the transmission rod 31 is rotatably connected to the eccentric shaft 25 through the rotating pair 32, and the other end is rotatably connected to the sliding mounting assembly 4 through the rotating pair 32.

[0050] In this embodiment, the rotating pair 32 is a bearing, which is installed at both ends of the transmission rod 31.

[0051] A limiting nut 26 is installed at the end of the eccentric shaft 25 to lock the transmission rod 31 of the motion conversion component 3, and a boss is machined on the limiting nut 26; the boss design of the limiting nut 26 can avoid interference with the bearing on the transmission rod 31 during tightening, ensuring smooth assembly and maintenance operations; its principle is as follows:

[0052] The diameter of the boss is the same as that of the inner ring of the aforementioned rotating pair 32 bearing; when the limit nut 26 is tightened, the locking force is transmitted through the path of the boss, the inner ring of the bearing and the eccentric shaft 25, avoiding the outer ring of the bearing, thereby fixing the inner ring of the bearing while allowing the outer ring to rotate without interference.

[0053] Furthermore, the sliding mounting assembly 4 includes a guide rail slider 41, a brush pressure plate 42, a brush mounting plate 43, a brush fixing plate 44, a quick-release locking element 45, and a slider fixing plate 46. The guide rail slider 41 is connected to the front panel 12, and the slider fixing plate 46 is slidably connected to the guide rail slider 41. The guide rail slider 41 is connected to the transmission rod 31 through a rotating joint 32. The brush fixing plate 44 is connected to the slider fixing plate 46 through the quick-release locking element 45. The brush mounting plate 43 is used to mount the brush, and the brush mounting plate 43 is locked onto the brush fixing plate 44 by the brush pressure plate 42.

[0054] The brushes on the brush mounting plate 43 are fixed by spot welding. 10 to 20 brushes can be fixed at a time by spot welding. The design of fixing a large number of brushes by spot welding enables batch testing, which greatly improves the testing efficiency and allows for the rapid accumulation of reliability data.

[0055] In this embodiment, the brush pressure plate 42 can be connected to the brush fixing plate 44 by bolts; when the bolts are tightened, the brush pressure plate 42 firmly presses the brush mounting plate 43 onto the brush fixing plate 44.

[0056] The mounting surface of the brush fixing plate 44 is tilted, which is consistent with the mounting angle of the brush in actual sensor and potentiometer products. The angle design of the brush fixing plate 44 can simulate the actual working conditions of the brush, ensure the consistency between the test results and the actual application scenario, and improve the reference value of the data.

[0057] In this embodiment, with Figure 6 For reference, the tilt angle can be set to 120° with the horizontal plane. Considering the actual working conditions of different products, the tilt angle can be selected and set in the range of 115° to 130° according to the specifications of the brush being tested.

[0058] The quick-release locking element 45 allows for tightening and loosening without the need for tools. This convenient operation simplifies the brush installation and removal process, facilitating height and pressure tests on the brushes and reducing testing time. The brush mounting plate 43, in conjunction with the quick-release locking element 45, enables rapid installation and removal, allowing for multiple batches of brush tests to be performed in a short time by replacing the brush mounting plate 43. For reference, in this embodiment, the quick-release locking element 45 is a hand-tightening nut.

[0059] In addition to achieving sliding connection, the guide rail slider 41 also ensures the straightness accuracy of the reciprocating motion of the sliding mounting component 4. The straightness accuracy of the guide rail slider 41 ensures that abnormal contact between the brush and the baffle component 5 is avoided due to motion offset, thus ensuring the stability of the test process.

[0060] Furthermore, the baffle assembly 5 includes an adjustment platform 51, a mounting plate 52, and a baffle 53; the adjustment platform 51 is mounted on the base plate 11 and is connected to the mounting plate 52, and the adjustment platform 51 is used to adjust the position of the mounting plate 52; the baffle 53 is mounted on the mounting plate 52, and the mounting plate 52 is provided with an elastic clamp for clamping the baffle 53.

[0061] The adjustment platform 51 has a precise adjustment function in the horizontal axis direction, and the adjustment accuracy can be adapted to the fine adjustment requirements of the brush deformation △H. The precise adjustment function of the horizontal axis provides a guarantee for the accurate setting of the brush deformation △H, and can flexibly adjust the degree of brush deformation according to the test requirements, thereby improving the controllability of the test parameters. In this embodiment, the adjustment platform 51 is adjusted in the horizontal axis direction by rotating the handle. It can also be driven by a cylinder, stepper motor, etc. The specific driving method and driving principle are existing technologies and will not be further described here.

[0062] The baffle 53 is made of a material with high light transmittance and high surface finish, and its surface roughness is much lower than that of traditional metal contacts. The baffle 53 with high surface finish can ensure smooth and unobstructed contact with the brush contacts, avoid wear or damage to the brush contacts due to rough contact surfaces, reduce ineffective losses during the test, ensure that the test results only reflect the fatigue characteristics of the brush, and improve the accuracy of the data. For reference, in this embodiment, the baffle 53 is made of glass.

[0063] The clamping method of the elastic clamp ensures the firmness of the baffle 53 while avoiding the risk of baffle 53 breaking due to rigid clamping, thus reducing the cost of test consumables.

[0064] Example 2

[0065] Please refer to the attached document as well. Figure 1-8 Based on Example 1, this embodiment provides a brush fatigue test method, including the following steps:

[0066] S1. Measure the height H1 and pressure F0 of the brush before the test using a measuring mechanism to determine the relevant parameters of the brush fatigue test. The relevant parameters include the brush deformation ΔH, the test frequency f, and the number of tests m.

[0067] S2. Mount the brush to be tested on the sliding mounting assembly 4 and adjust the position of the baffle assembly 5 to set the brush deformation ΔH; at the same time, adjust the running speed of the motor 21 to set the test frequency f;

[0068] S3. Start the motor 21, so that the brushes, driven by the sliding mounting assembly 4, contact the baffle 53 on the baffle assembly 5 and reciprocate, perform the fatigue test, and record the running time of the motor 21 to determine the number of tests m;

[0069] S4. After the test, the height H2 of the brush after the maximum deformation during the brush test and the brush pressure F1 after the test are measured by the measuring mechanism. The brush deformation ΔH and brush pressure loss ΔF are calculated. At the same time, the number of times the motor 21 runs when the brush breaks is recorded. The number of runs is the brush fatigue life number.

[0070] Furthermore, the brush deformation ΔH = H1 - H2, where H1 is the brush height before the test and H2 is the height of the brush after maximum deformation during the test; the brush pressure damage ΔF = F0 - F1, where F0 is the brush pressure before the test and F1 is the brush pressure after the test.

[0071] refer to Figure 8 In this embodiment, the brush height refers to the distance between the vertex of the free end of the brush (i.e. the contact point that contacts the baffle 53) and the starting point of the brush on the horizontal line. This distance is the distance between the projection point and the starting point of the brush on the horizontal line (corresponding to the amplitude in the traditional vibration test process).

[0072] The physical meaning of the brush deformation ΔH corresponds to the "amplitude" in traditional vibration tests. That is, by setting ΔH, the maximum deformation of the brush under actual vibration conditions can be simulated.

[0073] Furthermore, in S2, by changing the position of the adjustment platform 51, the mounting plate 52 and the baffle 53 are moved to change the relative position of the baffle 53 and the brush, thereby setting the brush deformation ΔH.

[0074] Specifically, by adjusting the adjustment platform 51 to move the baffle 53 toward the sliding mounting assembly 4, the deformation ΔH of the brush can be increased; conversely, the deformation ΔH can be decreased.

[0075] Furthermore, the relationship between the test frequency f and the operating speed n of motor 21 is f=60n, and the relationship between the number of tests m and the operating speed n and operating time t of motor 21 is m=nt.

[0076] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed above through embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for testing brush fatigue, characterized in that, The apparatus for implementing the method includes a frame (1), a motion conversion assembly (3), a sliding mounting assembly (4), and a drive assembly (2) and a baffle assembly (5) both connected to the frame (1). The drive assembly (2) includes a motor (21) for providing rotational power to the motion conversion assembly (3). One end of the motion conversion assembly (3) is connected to the drive assembly (2), and the other end is connected to the sliding mounting assembly (4). The motion conversion assembly (3) is used to convert rotational power into linear reciprocating motion. The baffle assembly (5) is spaced apart from the sliding mounting assembly (4). The baffle assembly (5) includes an adjustment platform (51), a mounting plate (52), and a baffle (53). The adjustment platform (51) is connected to the mounting plate (52) and is used to adjust the position of the mounting plate (52). The baffle (53) is mounted on the mounting plate (52). The method includes the following steps: S1. Measure the height H1 and pressure F0 of the brush before the test using a measuring mechanism to determine the relevant parameters of the brush fatigue test. The relevant parameters include the brush deformation ΔH, the test frequency f, and the number of tests m. S2. Install the brush to be tested on the sliding mounting assembly (4) and adjust the position of the baffle assembly (5) to set the brush deformation ΔH; at the same time, adjust the running speed of the motor (21) to set the test frequency f; S3. Start the motor (21) so that the brushes, driven by the sliding mounting assembly (4), come into contact with the baffle (53) on the baffle assembly (5) and reciprocate. Perform the fatigue test and record the running time of the motor (21) to determine the number of tests m. S4. After the test, the height H2 of the brush after the maximum deformation during the brush test and the brush pressure F1 after the test are measured by the measuring mechanism. The brush deformation ΔH and brush pressure loss ΔF are calculated. At the same time, the number of times the motor (21) runs when the brush breaks is recorded. The number of times it runs is the brush fatigue life number.

2. The method according to claim 1, characterized in that, The brush deformation ΔH = H1 - H2, where H1 is the brush height before the test and H2 is the height of the brush after maximum deformation during the test; the brush pressure loss ΔF = F0 - F1, where F0 is the brush pressure before the test and F1 is the brush pressure after the test.

3. The method according to claim 2, characterized in that, In S2, by adjusting the position of the adjustment platform (51), the mounting plate (52) and the baffle (53) are moved to change the relative position of the baffle (53) and the brush, thereby setting the brush deformation ΔH.

4. The method according to claim 3, characterized in that, The relationship between the test frequency f and the operating speed n of the motor (21) is f=60n, and the relationship between the number of tests m and the operating speed n and operating time t of the motor (21) is m=nt.

5. The method according to claim 4, characterized in that, The frame (1) includes a base plate (11), a front panel (12), a top panel (13), legs (15), side panels, and a rear panel (17); the front panel (12), the side panels, and the rear panel (17) are all connected to the base plate (11), and the front panel (12), the side panels, and the rear panel (17) are all connected to the top panel (13); the front panel (12), the top panel (13), the side panels, the rear panel (17), and the base plate (11) enclose a cavity, and the drive assembly (2) is located in the cavity; the legs (15) are installed at the bottom of the base plate (11); handles (16) are installed on both sides of the frame (1).

6. The method according to claim 5, characterized in that, The drive assembly (2) further includes a motor mounting base (22), a coupling (23), a bearing housing (24), and an eccentric shaft (25). The motor (21) is connected to the frame (1) through the motor mounting base (22), and the output end of the motor (21) is connected to the eccentric shaft (25) through the coupling (23). The bearing housing (24) is connected to the front panel (12), and the eccentric shaft (25) passes through the bearing housing (24).

7. The method according to claim 6, characterized in that, The motion conversion assembly (3) includes a transmission rod (31), and both ends of the transmission rod (31) are provided with a rotating pair (32). One end of the transmission rod (31) is rotatably connected to the eccentric shaft (25) through the rotating pair (32), and the other end is rotatably connected to the sliding mounting assembly (4) through the rotating pair (32).

8. The method according to claim 7, characterized in that, The sliding mounting assembly (4) includes a guide rail slider (41), a brush pressure plate (42), a brush mounting plate (43), a brush fixing plate (44), a quick-release locking element (45), and a slider fixing plate (46). The guide rail slider (41) is connected to the front panel (12), and the slider fixing plate (46) is slidably connected to the guide rail slider (41). The guide rail slider (41) is connected to the transmission rod (31) through the rotating pair (32). The brush fixing plate (44) is connected to the slider fixing plate (46) through the quick-release locking element (45). The brush mounting plate (43) is used to install the brush, and the brush mounting plate (43) is locked onto the brush fixing plate (44) by the brush pressure plate (42).

9. The method according to claim 8, characterized in that, The adjustment platform (51) is installed on the base plate (11), and the mounting plate (52) is provided with an elastic clamp, which is used to clamp the baffle (53).

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