Automatic cleaning device for public environment health
Through a gear meshing and linkage structure driven by a hydraulic cylinder, the cleaning brush angle and vehicle height are automatically adjusted synchronously, solving the problem of poor adaptability to cleaning sloping surfaces and improving the operating efficiency and automation level of the cleaning equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-18
- Publication Date
- 2026-06-16
AI Technical Summary
When existing automatic cleaning equipment cleans on sloping ground, the cleaning brush angle is not synchronized with the vehicle height, resulting in high operating difficulty, poor cleaning adaptability, and low efficiency.
The moving block is driven by a hydraulic cylinder to slide, which in turn drives the gear to mesh with the rotating rod, thereby adjusting the angle of the cleaning brush by winding the traction rope. The lifting frame is also driven by a connecting rod to adjust the height of the vehicle body, thus achieving synchronous automatic adjustment of the cleaning brush angle and the vehicle body height.
The cleaning brush can quickly adapt to different slopes, ensuring good contact with the ground, improving the adaptability and efficiency of cleaning operations, reducing manual operation costs, and achieving automated cleaning.
Smart Images
Figure CN122208029A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cleaning equipment technology, specifically to an automatic cleaning device for public environmental sanitation. Background Technology
[0002] With the trend of professionalization and intelligent development in the domestic service industry, the coverage of domestic cleaning services in campuses and communities is constantly expanding. The cleaning needs of teaching buildings, dormitories, campus walkways, community corridors and public activity areas are becoming increasingly refined, which puts forward higher requirements for the terrain adaptability, ease of operation and work efficiency of cleaning equipment. Automatic cleaning equipment has gradually become an important tool for domestic cleaning services. Its performance and stability directly affect the quality of domestic cleaning services and the overall work efficiency. It is also a key research direction for equipment in the professional teaching and practical application of the College of Home Economics.
[0003] Currently, most automatic cleaning equipment used in the domestic cleaning industry has a fixed structure design. The angle of the cleaning brush and the height of the vehicle body off the ground cannot be adjusted in conjunction with the operator. Even the few adjustable devices require manual adjustment step by step. When working on sloping ground, such as in schools and communities, where domestic services often involve cleaning, adjusting the cleaning brush angle alone can cause the vehicle body to become unstable, while adjusting the vehicle height alone can prevent the cleaning brush from effectively contacting the slope, easily creating cleaning blind spots. This problem stems from the asynchrony between the equipment's angle and height adjustments, which not only increases the operational difficulty for domestic service personnel and consumes a lot of manual labor, but also leads to low work efficiency due to poor cleaning adaptability. It is difficult to meet the diverse cleaning needs of domestic service teaching practice and domestic service scenarios. In response to this technical problem, this application proposes an automatic cleaning device for public environmental sanitation. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides an automatic cleaning device for public environmental sanitation, which solves the problems of asynchronous angle and height adjustment of cleaning equipment, difficult operation, poor adaptability, and low cleaning efficiency.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic public environmental sanitation cleaning device, comprising: A sweeper has a front side plate fixedly connected to its front side, a support base fixedly connected to the bottom side of the front side plate, a guide assembly fixedly connected to the top side of the support base, a rotating rod rotatably connected to the rear side of the support base, an adjustment frame rotatably connected to the bottom side of the support base, a cleaning brush rotatably connected to the front end of the adjustment frame, and the top side of the adjustment frame connected to the rotating rod via a winding assembly. A fixed base is provided, with a sliding rod fixedly connected to its front end. The front end of the sliding rod is fixedly connected to the rear side of the front side plate. A movable block is sleeved on the outer wall of the sliding rod. The bottom side of the movable block is connected to the middle end of the rotating rod through a gear set. A lifting frame is rotatably connected to the bottom side of the fixed base. The middle end of the lifting frame is connected to the rear end of the movable block through a linkage component. A roller is rotatably connected to the bottom end of the lifting frame.
[0006] Preferably, the guide assembly includes a guide box fixedly connected to the top side of the support base, and a guide wheel is rotatably connected to the inner wall of the guide box.
[0007] Preferably, the winding assembly includes winding rollers fixedly connected to both ends of the rotating rod, the winding rollers and the top side of the adjusting frame are connected by a traction rope, and the traction rope is disposed on the outer wall of the guide wheel.
[0008] Preferably, the gear set includes a gear fixedly connected to the middle end of the rotating rod, and a rack is fixedly connected to the bottom side of the moving block, wherein the rack and the gear are meshed together.
[0009] Preferably, the linkage component includes a fixed shaft fixedly connected to the rear end of the moving block, a connecting rod rotatably connected to the outer wall of the fixed shaft, and the rear end of the connecting rod rotatably connected to the middle end of the lifting frame.
[0010] Preferably, a hydraulic cylinder is installed on the rear side of the front side plate, and the drive end of the hydraulic cylinder is fixedly connected to the front side of the moving block.
[0011] An automated cleaning method for public environmental sanitation includes the following steps: Step 1: By activating the hydraulic cylinder, the moving block is pushed to slide on the outer wall of the slide bar, which drives the meshing between the rack and gear, and drives the rotation of the rotating rod. Step 2: The rotating rod drives the winding roller to wind the traction rope, then pulls up the front end of the adjustment frame to adjust the angle of the cleaning brush. Step 3: The moving block will drive the connecting rod to rotate between the middle of the lifting frame and the fixed shaft, thereby adjusting the angle of the lifting frame; Step 4: Adjusting the lifting frame will adjust the distance between the sweeper and the ground, and the angle of the cleaning brush will also be adjusted to adapt to different slopes before starting the sweeper to clean the required ground.
[0012] Preferably, in step one, when the hydraulic cylinder pushes the moving block to slide along the slide bar, the sliding stroke of the moving block is linearly corresponding to the rotation angle of the rotating rod. When the moving block slides forward, it drives the gear to rotate clockwise, and when the moving block slides backward, it drives the gear to rotate counterclockwise.
[0013] Preferably, in step two, when the winding roller winds the traction rope, the traction rope slides along the outer wall of the guide wheel, and the angle adjustment range of the cleaning brush is 30°-60° with respect to the ground.
[0014] Preferably, in step three, when the moving block drives the connecting rod to rotate, the connection point between the connecting rod and the lifting frame moves in an arc around the rotation point of the lifting frame and the fixed seat. The angle adjustment of the lifting frame and the angle adjustment of the cleaning brush are carried out synchronously, and the lifting height of the lifting frame is adapted to the angle adjustment range of the cleaning brush.
[0015] Working Principle: When the equipment is working, the hydraulic cylinder on the rear side of the front panel is first activated. The drive end of the hydraulic cylinder pushes the moving block to slide back and forth along the slide rod. The slide rod is fixed between the front end of the fixed seat and the rear side of the front panel, providing stable guidance for the sliding of the moving block. During the sliding process of the moving block, the rack on its bottom side meshes with the gear at the middle end of the rotating rod, thereby driving the rotating rod to rotate on the rear side of the support seat. The support seat is fixed to the bottom side of the front panel, providing stable support for the rotating rod. When the rotating rod rotates, its two ends will drive the traction rope to wind. The traction rope slides along the guide structure, thereby pulling the front end of the adjusting frame upward. The adjusting frame is rotatably connected to the bottom side of the support seat, and the cleaning brush at its front end will adjust its angle with the rotation of the adjusting frame to adapt to different cleaning needs. Simultaneously, as the moving block moves rearward, it drives the connecting rod to rotate via the fixed structure at its rear. The rear end of the connecting rod is rotatably connected to the middle of the lifting frame, which in turn is rotatably connected to the bottom of the fixed base. The rotation of the connecting rod triggers angle adjustment of the lifting frame, thereby changing the contact height between the rollers at the bottom of the lifting frame and the ground, and thus adjusting the distance between the entire sweeper and the ground. The angle adjustment of the cleaning brush and the height adjustment of the lifting frame are synchronized, and their adjustment ranges are mutually compatible, ensuring that the equipment can smoothly adapt to ground environments with different slopes. Once adjusted to the appropriate state, the sweeper can be started, and the cleaning brushes can automatically clean the ground to be cleaned.
[0016] This invention provides an automatic cleaning device for public environmental sanitation. It has the following beneficial effects: 1. This invention uses a hydraulic cylinder to push a moving block along a sliding rod, which in turn drives a rack and pinion to mesh and rotate a rotating rod. The rotating rod pulls a traction rope to adjust the angle of the cleaning brush. At the same time, the moving block drives a connecting rod to rotate through a fixed shaft, which in turn adjusts the height of the sweeper off the ground. The two adjustments are synchronized and matched, and the angle of the cleaning brush can be quickly adapted to different slopes, ensuring that the cleaning brush is always in good contact with the ground. This solves the problem of poor adaptability of traditional equipment for cleaning sloped ground, and improves the adaptability and cleaning effect of cleaning operations.
[0017] 2. This invention achieves automated adjustment of the cleaning brush angle and the vehicle's height from the ground through the structural cooperation of a hydraulic cylinder, a moving block, a rack and pinion, a rotating rod, a connecting rod, and a lifting frame. No manual operation is required. Furthermore, the linear transmission driven by the hydraulic cylinder ensures that the sliding stroke of the moving block and the rotation angle of the rotating rod correspond precisely, guaranteeing the stability and accuracy of the adjustment process. This significantly reduces manual operation costs and automates cleaning operations, effectively improving the overall efficiency of public environmental sanitation cleaning. Attached Figure Description
[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the adjusting frame structure of the present invention; Figure 3 This is a schematic diagram of the fixing base structure of the present invention; Figure 4 This is a schematic diagram of the support structure of the present invention; Figure 5 This is a flowchart of the present invention.
[0019] The components are as follows: 1. Sweeper; 2. Front side panel; 3. Adjustment frame; 4. Cleaning brush; 5. Fixed seat; 6. Lifting frame; 7. Roller; 8. Slide bar; 9. Hydraulic cylinder; 10. Moving block; 11. Guide box; 12. Traction rope; 13. Connecting rod; 14. Fixed shaft; 15. Gear; 16. Rotating rod; 17. Winding roller; 18. Guide wheel; 19. Support seat; 20. Rack. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Example: Please see the appendix Figure 1 -Appendix Figure 3This invention provides an automatic cleaning device for public environmental sanitation, including a sweeper 1. A front side plate 2 is fixedly connected to the front side of the sweeper 1. A support base 19 is fixedly connected to the bottom side of the front side plate 2. A guide box 11 is fixedly connected to the top side of the support base 19. A guide wheel 18 is rotatably connected to the inner wall of the guide box 11. A rotating rod 16 is rotatably connected to the rear side of the support base 19. An adjustment frame 3 is rotatably connected to the bottom side of the support base 19. A cleaning brush 4 is rotatably connected to the front end of the adjustment frame 3. A winding roller 17 is fixedly connected to both ends of the rotating rod 16. The winding roller 17 and the top side of the adjustment frame 3 are connected by a traction rope 12. The traction rope 12 is set on the outer wall of the guide wheel 18. A hydraulic cylinder 9 is installed on the rear side of the front side plate 2. The drive end of the hydraulic cylinder 9 is fixedly connected to the front side of the moving block 10. Specifically, the guide box 11 and the support base 19 are integrally welded and fixed. The guide wheel 18 is rotatably connected inside the guide box 11 through a rotating shaft, and can rotate freely to guide and reduce friction on the traction rope 12. The rotating rod 16 is rotatably connected to the bearing seat on the rear side of the support base 19 through a bearing to ensure rotational stability. The adjusting frame 3 is made of alloy material, and wear-resistant pads are provided at its rotational connection point with the support base 19. The cleaning brush 4 is a hard-bristled brush roller structure, which is rotatably connected to the front end of the adjusting frame 3 through a rotating shaft. It can rotate with the adjusting frame 3 to achieve angle adjustment, and has its own drive motor on the top side. The winding roller 17 is keyed and fixed to the rotating rod 16, and can rotate synchronously with the rotating rod 16. The traction rope 12 is made of high-strength wear-resistant steel wire rope. One end is fixed to the outer wall of the winding roller 17, and the other end is fixed to the pre-set connecting ring on the top side of the adjusting frame 3. The hydraulic cylinder 9 is fixed to the mounting bracket on the rear side of the front plate 2 by bolts. The drive end and the moving block 10 are connected by a flange to ensure transmission stability.
[0022] Please see the appendix Figure 2 -Appendix Figure 4 A sliding rod 8 is fixedly connected to the front end of the fixed base 5. The front end of the sliding rod 8 is fixedly connected to the rear side of the front side plate 2. A moving block 10 is sleeved on the outer wall of the sliding rod 8. A gear 15 is fixedly connected to the middle end of the rotating rod 16. A rack 20 is fixedly connected to the bottom side of the moving block 10. The rack 20 and the gear 15 are meshed. A lifting frame 6 is rotatably connected to the bottom side of the fixed base 5. A fixed shaft 14 is fixedly connected to the rear end of the moving block 10. A connecting rod 13 is rotatably connected to the outer wall of the fixed shaft 14. The rear end of the connecting rod 13 is rotatably connected to the middle end of the lifting frame 6. A roller 7 is rotatably connected to the bottom end of the lifting frame 6. Specifically, the fixed seat 5 and the slide rod 8 are welded together. The slide rod 8 is a smooth chrome-plated round rod. The moving block 10 has a linear bearing inside, which is sleeved on the outer wall of the slide rod 8 to achieve smooth forward and backward sliding. The gear 15 is fixed to the middle of the rotating rod 16 by a flat key. The rack 20 is fixed to the bottom side of the moving block 10 by bolts. The tooth profile of the rack 20 is perfectly matched with that of the gear 15 to ensure the accuracy of meshing transmission. The lifting frame 6 is a bent alloy bracket, which is rotatably connected to the bottom side of the fixed seat 5 by a rotating shaft. The fixed shaft 14 and the moving block 10 are welded together. Both ends of the connecting rod 13 are provided with bushings, which are respectively sleeved on the connecting shaft at the middle of the fixed shaft 14 and the lifting frame 6, and can rotate freely to achieve linkage. The roller 7 is a rubber shock-absorbing roller, which is rotatably connected to the bottom of the lifting frame 6 by a wheel axle. It can adapt to the contact requirements of different ground surfaces and also plays a buffering role.
[0023] Please see the appendix Figure 5 An automated cleaning method for public environmental sanitation includes the following steps: Step 1: By starting the hydraulic cylinder 9, the moving block 10 is pushed to slide on the outer wall of the slide rod 8, which drives the meshing between the rack 20 and the gear 15, and drives the rotation rod 16 to rotate. In Step 1, when the hydraulic cylinder 9 pushes the moving block 10 to slide along the slide rod 8, the sliding stroke of the moving block 10 is linearly corresponding to the rotation angle of the rotation rod 16. When the moving block 10 slides forward, it drives the gear 15 to rotate clockwise, and when the moving block 10 slides backward, it drives the gear 15 to rotate counterclockwise. Specifically, the hydraulic control system of hydraulic cylinder 9 is activated, and the drive end of hydraulic cylinder 9 is extended and retracted by controlling the inlet and outlet of hydraulic oil, thereby driving the moving block 10 to move linearly along the slide rod 8. The sliding stroke of the moving block 10 is precisely controlled by the stroke sensor of the hydraulic control system. For each preset sliding distance, gear 15 will drive the rotating rod 16 to rotate at a fixed angle to achieve linear transmission and ensure the accuracy of subsequent adjustments. When sliding forward, rack 20 pushes gear 15 to rotate clockwise, and when sliding backward, rack 20 pulls gear 15 to rotate counterclockwise. The rotation direction and the sliding direction form a fixed linkage relationship.
[0024] Please see the appendix Figure 5 Step 2: The rotating rod 16 drives the winding roller 17 to rotate and wind the traction rope 12. Then, the front end of the adjusting frame 3 is pulled up to adjust the angle of the cleaning brush 4. In step 2, when the winding roller 17 winds the traction rope 12, the traction rope 12 slides along the outer wall of the guide wheel 18. The angle adjustment range of the cleaning brush 4 is 30°-60° with respect to the ground. Specifically, the rotating rod 16 synchronously drives the winding rollers 17 at both ends to rotate. When the winding rollers 17 rotate, they wind up the traction rope 12. The traction rope 12 slides on the outer wall of the guide wheel 18. The guide wheel 18 changes the direction of the tension, converting the vertical tension into an upward tension that pulls the front end of the adjusting frame 3. The adjusting frame 3 rotates upward around the rotation point of the support base 19, thereby driving the cleaning brush 4 to adjust the angle with the ground. By controlling the sliding stroke of the moving block 10, the angle of the cleaning brush 4 can be precisely controlled between 30° and 60° with the ground to meet the cleaning contact requirements of different slopes. The rotation of the guide wheel 18 effectively reduces the friction of the traction rope 12 when it slides, thus preventing the traction rope 12 from wearing out.
[0025] Please see the appendix Figure 5 Step 3: The moving block 10 will drive the connecting rod 13 to rotate between the middle of the lifting frame 6 and the fixed shaft 14, thereby adjusting the angle of the lifting frame 6. In step 3, when the moving block 10 drives the connecting rod 13 to rotate, the connection point between the connecting rod 13 and the lifting frame 6 moves in an arc around the rotation point of the lifting frame 6 and the fixed seat 5. The angle adjustment of the lifting frame 6 and the angle adjustment of the cleaning brush 4 are carried out synchronously, and the lifting height of the lifting frame 6 is matched with the angle adjustment range of the cleaning brush 4. Specifically, when the moving block 10 slides back and forth, its rear fixed shaft 14 moves in a straight line, which in turn drives one end of the connecting rod 13 to move with the fixed shaft 14. The other end of the connecting rod 13 rotates around the connecting shaft at the middle of the lifting frame 6, and at the same time pushes the lifting frame 6 to rotate in an arc around the rotation point with the fixed seat 5, so as to realize the adjustment of the angle of the lifting frame 6. A single sliding action of the moving block 10 will simultaneously drive the angle adjustment of the cleaning brush 4 and the angle adjustment of the lifting frame 6. The two adjustment processes are completely synchronized, and the lifting height of the roller 7 at the bottom of the lifting frame 6 is matched with the angle adjustment range of the cleaning brush 4. For example, when the angle between the cleaning brush 4 and the ground increases, the roller 7 rises synchronously to ensure the overall stability of the sweeper 1.
[0026] Please see the appendix Figure 5 Step 4: The adjustable lifting frame 6 will adjust the distance between the sweeper 1 and the ground, and the angle of the cleaning brush 4 will also be adjusted. After adapting to different slopes, the sweeper 1 will be started to clean the ground as needed. Specifically, after the lifting frame 6 is adjusted at an angle, the contact height between the roller 7 at its bottom and the ground changes, which in turn drives the distance between the entire sweeper 1 and the ground to adjust. In conjunction with the cleaning brush 4 being adjusted to a suitable angle, the cleaning brush 4 of the equipment can always maintain good contact with the ground of different slopes. After the angle and height are adjusted to the correct position, the walking system of the sweeper 1 and the rotation drive system of the cleaning brush 4 are started. The sweeper 1 travels along the preset route, and the cleaning brush 4 rotates to sweep up the garbage and dust on the ground, realizing the automatic cleaning operation of public environmental sanitation.
[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An automatic public environmental sanitation cleaning device, characterized in that, include: A sweeper (1) is fixedly connected to a front side plate (2) on its front side. A support base (19) is fixedly connected to the bottom side of the front side plate (2). A guide assembly is fixedly connected to the top side of the support base (19). A rotating rod (16) is rotatably connected to the rear side of the support base (19). An adjustment frame (3) is rotatably connected to the bottom side of the support base (19). A cleaning brush (4) is rotatably connected to the front end of the adjustment frame (3). The top side of the adjustment frame (3) is connected to the rotating rod (16) through a winding assembly. A fixed base (5) is fixedly connected to a slide rod (8) at its front end. The front end of the slide rod (8) is fixedly connected to the rear side of the front side plate (2). A moving block (10) is sleeved on the outer wall of the slide rod (8). The bottom side of the moving block (10) is connected to the middle end of the rotating rod (16) through a gear set. A lifting frame (6) is rotatably connected to the bottom side of the fixed base (5). The middle end of the lifting frame (6) is connected to the rear end of the moving block (10) through a linkage component. A roller (7) is rotatably connected to the bottom end of the lifting frame (6).
2. The automatic public environmental sanitation cleaning equipment according to claim 1, characterized in that, The guide assembly includes a guide box (11) fixedly connected to the top side of the support base (19), and a guide wheel (18) is rotatably connected to the inner wall of the guide box (11).
3. The automatic public environmental sanitation cleaning equipment according to claim 2, characterized in that, The winding assembly includes winding rollers (17) fixedly connected to both ends of the rotating rod (16). The winding rollers (17) and the top side of the adjusting frame (3) are connected by a traction rope (12), which is set on the outer wall of the guide wheel (18).
4. The automatic public environmental sanitation cleaning equipment according to claim 1, characterized in that, The gear set includes a gear (15) fixedly connected to the middle end of the rotating rod (16), and a rack (20) fixedly connected to the bottom side of the moving block (10). The rack (20) and the gear (15) are meshed together.
5. The automatic public environmental sanitation cleaning equipment according to claim 1, characterized in that, The linkage component includes a fixed shaft (14) fixedly connected to the rear end of the moving block (10), and a connecting rod (13) rotatably connected to the outer wall of the fixed shaft (14). The rear end of the connecting rod (13) is rotatably connected to the middle end of the lifting frame (6).
6. The automatic public environmental sanitation cleaning equipment according to claim 1, characterized in that, A hydraulic cylinder (9) is installed on the rear side of the front side plate (2), and the driving end of the hydraulic cylinder (9) is fixedly connected to the front side of the moving block (10).
7. An automatic cleaning method for public environmental sanitation, using an automatic cleaning device for public environmental sanitation as described in claims 1-6, characterized in that, Includes the following steps: Step 1: By starting the hydraulic cylinder (9), the moving block (10) is pushed to slide on the outer wall of the slide bar (8), which drives the meshing between the rack (20) and the gear (15), and drives the rotation of the rotating rod (16); Step 2: The rotating rod (16) drives the winding roller (17) to rotate and wind the traction rope (12). Then, the front end of the adjusting frame (3) is pulled up to adjust the angle of the cleaning brush (4). Step 3: The moving block (10) will drive the connecting rod (13) to rotate between the middle of the lifting frame (6) and the fixed shaft (14), thereby adjusting the angle of the lifting frame (6); Step 4: The adjustable lifting frame (6) will adjust the distance between the sweeper (1) and the ground. At the same time, the angle of the cleaning brush (4) will also be adjusted to adapt to different slopes. Then, the sweeper (1) will be started to clean the ground as needed.
8. The automatic cleaning method for public environmental sanitation according to claim 7, characterized in that, In step one, when the hydraulic cylinder (9) pushes the moving block (10) to slide along the slide bar (8), the sliding stroke of the moving block (10) is linearly corresponding to the rotation angle of the rotating rod (16). When the moving block (10) slides forward, it drives the gear (15) to rotate clockwise. When the moving block (10) slides backward, it drives the gear (15) to rotate counterclockwise.
9. The automatic cleaning method for public environmental sanitation according to claim 7, characterized in that, In step two, when the winding roller (17) winds the traction rope (12), the traction rope (12) slides along the outer wall of the guide wheel (18), and the angle adjustment range of the cleaning brush (4) is 30°-60° with respect to the ground.
10. The automatic cleaning method for public environmental sanitation according to claim 7, characterized in that, In step three, when the moving block (10) drives the connecting rod (13) to rotate, the connection point between the connecting rod (13) and the lifting frame (6) moves in an arc around the rotation point of the lifting frame (6) and the fixed seat (5). The angle adjustment of the lifting frame (6) and the angle adjustment of the cleaning brush (4) are carried out synchronously, and the lifting height of the lifting frame (6) is matched with the angle adjustment range of the cleaning brush (4).