Motor sweeper with height-adjustable main brush

Abstract

The invention discloses a sweeping vehicle with a height-adjustable main brush, and relates to the technical field of sweeping vehicles, the sweeping vehicle comprises a vehicle body, a main brush assembly, a transmission assembly and a driving part, and arc-shaped grooves are formed in the two sides of the vehicle body; the main brush assembly comprises a roller, bristle strips, a rotating shaft, a first end cover, a second end cover, a connecting cylinder and a driving motor. The first end cover and the second end cover are installed at the two ends of the roller, the first end cover is fixedly connected to a rotor of the driving motor, and the driving motor drives the first end cover and the connecting cylinder to rotate so as to drive the roller and the bristles to rotate; the transmission assembly comprises a cross rod, two swing arms, two transmission pieces and two connecting pieces, the cross rod penetrates through the vehicle body, the two transmission pieces are fixedly connected to the two ends of the cross rod, the two swing arms are rotationally connected to the two sides of the vehicle body respectively, and the two ends of the connecting pieces are connected with the swing arms and the transmission pieces respectively; the driving part is in transmission connection with the transmission part and drives the main brush assembly to ascend and descend along the arc-shaped groove through the transmission part. The device can be better adapted to different road surface operations.

Description

Technical Field

[0001] This invention relates to the field of sweeper technology, and in particular to a sweeper with an adjustable main brush height. Background Technology

[0002] Sweepers are core equipment in the field of road cleaning, and the main brush assembly, as a key component that directly contacts the ground to complete the cleaning, has a significant impact on its performance due to its installation method. In early sweeper designs and some existing low-cost equipment, the main brush is often fixedly connected by bolts, welding, or rigid brackets. Its height, contact angle with the ground, and contact pressure are completely locked at the factory and cannot be adjusted. This design has extremely poor adaptability to road surfaces. When facing potholes, bumps, or different road materials, it is prone to excessive brush bristle wear, vehicle vibration, or blind spots, resulting in poor cleaning performance. Summary of the Invention

[0003] The main objective of this invention is to provide a sweeper with an adjustable main brush height, which allows for adjustment of the position of the main brush assembly to adapt to different road surfaces and improve the sweeping effect.

[0004] To achieve the above objectives, the sweeper proposed in this invention includes: The vehicle body has arc-shaped grooves on both sides in the width direction, and the arc-shaped grooves extend from the bottom to the top. The main brush assembly includes a roller, bristle strips, a rotating shaft, a first end cap, a second end cap, a connecting cylinder, and a drive motor. The roller has a hollow structure, and the bristle strips are connected to the outer peripheral wall of the roller. The first end cap and the second end cap are respectively fixedly installed at both ends of the roller. The drive motor is an external rotor motor with a fixed shaft connected to the stator of the drive motor. The first end cap is fixedly connected to one end of the rotor of the drive motor. The two ends of the connecting cylinder are respectively connected to the other end of the rotor and the rotating shaft. The rotating shaft and the fixed shaft pass through the second end cap and the first end cap, respectively. The drive motor drives the first end cap to rotate, thereby driving the roller and bristles to rotate. The drive motor also drives the connecting cylinder and the rotating shaft to rotate, which in turn drives the second end cap to rotate. The second end cap drives the roller and bristles to rotate for cleaning operations. The fixed shaft and the rotating shaft are respectively inserted into two arc-shaped grooves. The transmission assembly includes a crossbar, two swing arms, two transmission components, and two connecting components. The crossbar passes through the vehicle body along the width direction. The two transmission components are fixedly connected to the portions of the crossbar extending out of the vehicle body. The two swing arms are rotatably connected to both sides of the vehicle body in the width direction. The rotation axis of the swing arms coincides with the center of the arc-shaped groove. The lower ends of the two connecting components are respectively connected to the swing arms, and the upper ends of the two connecting components are respectively connected to the transmission components. A drive component is installed on the vehicle body and is connected to one of the transmission components. It drives the transmission component to rotate, and the rotation of the transmission component drives the connecting component to rise and fall, thereby driving the main brush assembly to rise and fall along the arc-shaped groove.

[0005] In one embodiment, the transmission assembly further includes two elastic members, the lower ends of which are respectively connected to the end of the swing arm away from the main brush assembly, and the upper ends of the elastic members are connected to the vehicle body; the elastic members are in a stretched state.

[0006] In one embodiment, the transmission component includes an integrally connected shaft portion, a first connecting plate portion, and a second connecting plate portion; the first connecting plate portion and the second connecting plate portion are respectively connected to both ends of the shaft portion; the first connecting plate portion is connected to the output end of the drive component; the second connecting plate portion is connected to the connector; the second connecting plate portion is L-shaped and includes a first wall and a second wall, the first wall being connected to the shaft portion and the second wall being connected to the connector.

[0007] In one embodiment, the connector is a chain.

[0008] In one embodiment, the outer surface of the end cap has a plurality of reinforcing rings protruding outward, the thickness of the reinforcing rings being between 1.5 mm and 5 mm; and the thickness of the end cap being between 15 mm and 20 mm.

[0009] In one embodiment, the sweeper further includes a limiting assembly, which includes a fixing member and an adjusting bolt, one end of which passes through the fixing member and the other end of which extends toward the swing arm; the adjusting bolt is used to limit the lowest position of the swing arm.

[0010] In one embodiment, both ends of the roller have multiple positioning grooves, and the outer peripheral walls of the first end cover and the second end cover have multiple positioning protrusions that are inserted into the positioning grooves.

[0011] In one embodiment, the outer peripheral walls of the first end cap and the second end cap are recessed inward to form a plurality of communication channels connecting the inside of the roller to the outside.

[0012] In one embodiment, a first sleeve and a first locking member are sequentially fitted outside the fixed shaft; a second sleeve, a bearing, and a second locking member are sequentially fitted outside the rotating shaft, and the first end cap and the second end cap are respectively pressed onto the two ends of the roller by the first locking member and the second locking member.

[0013] In one embodiment, the main brush assembly further includes a shock absorber sleeved on the bearing, the shock absorber including an inner ring, an outer ring and a rubber ring located between the inner ring and the outer ring, the inner ring being sleeved on the bearing.

[0014] The technical solution of this invention improves the cleaning effect by adjusting the position of the main brush component to adapt to different road surfaces. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the sweeper provided by the present invention from one perspective; Figure 2 A schematic diagram of the structure of a sweeper vehicle according to another perspective of an embodiment of the present invention; Figure 3 A schematic diagram of the position of the main brush assembly in an embodiment of the sweeper provided by the present invention; Figure 4 This is a schematic diagram from another perspective of the location of the main brush assembly in an embodiment of the sweeper provided by the present invention; Figure 5 This is a schematic diagram of the transmission component of an embodiment of the sweeper provided by the present invention; Figure 6 A cross-sectional structural diagram of the main brush assembly location in an embodiment of the sweeper provided by the present invention; Figure 7 for Figure 6 A magnified view of a portion of the image; Figure 8 A schematic diagram of the internal structure of the main brush assembly in an embodiment of the sweeper provided by the present invention; Figure 9 This is a schematic diagram of the structure of the roller in an embodiment of the sweeper provided by the present invention.

[0017] Explanation of icon numbers: 10. Body; 11. Arc-shaped groove; 20. Main brush assembly; 21. Roller; 211. Positioning groove; 22. Brush strip; 221. Front half; 222. Rear half; 23. Rotating shaft; 231. Second sleeve; 232. Second locking element; 233. Bearing; 24. First end cap; 241. Positioning protrusion; 242. Connecting channel; 243. Reinforcing ring; 25. Second end cap; 26. Connecting cylinder; 261. Hollow shaft; 262. Flange edge; 27. Drive motor; 271. Fixed shaft; 272. 273. First sleeve; 28. First locking element; 29. ​​Shock absorber; 20. Inner ring; 21. Outer ring; 22. Rubber ring; 33. Transmission assembly; 34. Crossbar; 35. Swing arm; 36. Transmission component; 371. Shaft; 382. First connecting plate; 393. Second connecting plate; 30. Connecting component; 31. Elastic component; 32. Connecting frame; 331. Horizontal wall; 332. Vertical wall; 40. Driving component; 51. Limiting assembly; 52. Fixing component; 53. Adjusting bolt; 60. Side brush assembly.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] 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, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their 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 those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] This invention proposes a sweeper with an adjustable main brush height.

[0023] Please see Figures 1 to 9In one embodiment of the present invention, the main brush height adjustable sweeper includes a vehicle body 10, a main brush assembly 20, a transmission assembly 30, and a drive component 40. The vehicle body 10 has arc-shaped grooves 11 on both sides in the width direction, extending upwards from below. The main brush assembly 20 includes a roller 21, bristle strips 22, a rotating shaft 23, a first end cap 24, a second end cap 25, a connecting cylinder 26, and a drive motor 27. The roller 21 has a hollow structure, and the bristle strips 22 are connected to the outer peripheral wall of the roller 21. The two end caps are respectively fixedly installed at both ends of the roller 21. The drive motor is an external rotor motor. The drive motor 27 has a fixed shaft 271 connected to the stator of the drive motor 27. The first end cap 24 is fixedly connected to one end of the rotor of the drive motor 27. The two ends of the connecting cylinder 26 are respectively connected to the other end of the rotor and the rotating shaft 23. The rotating shaft 23 and the fixed shaft 271 pass through the second end cap 25 and the first end cap 24, respectively. The drive motor 27 drives the first end cover 24 to rotate, thereby rotating the roller 21 and brush bristles. The drive motor 27 also drives the connecting cylinder 26 and the rotating shaft 23 to rotate. The rotating shaft 23 drives the second end cover 25 to rotate, which in turn drives the roller 21 and brush bristles to rotate, thus performing the cleaning operation. The fixed shaft 271 and the rotating shaft 23 respectively pass into the arc-shaped groove 11. The transmission assembly 30 includes a crossbar 31, two swing arms 32, two transmission components 33, and two connecting components 34. The crossbar 31 passes through the vehicle body 10 along its width. The two transmission components 33 are respectively fixedly connected to the portions of the crossbar 31 extending out of the vehicle body 10, i.e., the two transmission components 33 are located on both sides of the width of the vehicle body 10, and are respectively fixed to both ends of the crossbar 31. Two swing arms 32 are rotatably connected to both sides of the vehicle body 10 in the width direction. The rotation axis of the swing arms 32 coincides with the center of the arc groove 11. The lower ends of the two connecting parts 34 are respectively connected to the swing arms 32, and the upper ends of the two connecting parts 34 are respectively connected to the transmission parts 33. The drive unit 40 is installed on the vehicle body 10 and is connected to one of the transmission parts 33. The drive unit 40 drives the transmission part 33 to rotate. The rotation of the transmission part 33 drives the connecting parts 34 to rise and fall, thereby driving the main brush assembly 20 to rise and fall along the arc groove 11.

[0024] Specifically, in this embodiment, symmetrical arc-shaped grooves 11 are provided on both sides of the vehicle body 10 in the width direction. The arc-shaped grooves 11 extend from the bottom of the vehicle body 10 to the top of the vehicle body 10, providing a sliding guide path for the main brush assembly 20. The main brush assembly 20 is located at the bottom of the vehicle body 10, and its two ends pass through the two arc-shaped grooves 11. The main brush assembly 20 includes bristle strips 22, rollers 21, rotating shafts 23, connecting cylinders 26, drive motors 27, and two end caps. The cleaning body adopts a combination of hollow rollers 21 and outer peripheral wall bristle strips 22. The first end cap 24 and the second end cap 25 are fixedly installed at both ends of the rollers 21, forming a closed and lightweight cleaning unit. The drive motor 27 is an external rotor motor. The stator of the drive motor 27 is connected to a fixed shaft 271 (exiting the first end cover 24). One axial end of the rotor of the drive motor 27 is fixedly connected to the first end cover 24, and the other axial end of the rotor is connected to a rotating shaft 23 (exiting the second end cover 25) through a connecting sleeve 26, forming a dual-end drive transmission structure. The rotor of the drive motor 27 directly drives the first end cover 24 to rotate, and at the same time drives the rotating shaft 23 to rotate through the connecting sleeve 26. The rotating shaft 23 further drives the second end cover 25 to rotate, and the dual power is transmitted to the roller 21 and the bristle strip 22. The fixed shaft 271 (corresponding to the side of the first end cover 24) and the rotating shaft 23 (corresponding to the side of the second end cover 25) respectively pass into the arc-shaped grooves 11 on both sides of the vehicle body 10, forming symmetrical movable fulcrums for the lifting and lowering of the main brush assembly 20.

[0025] The transmission assembly 30 includes a crossbar 31, two swing arms 32, two transmission components 33, and two connecting components 34. The crossbar 31 extends through the width of the vehicle body 10, with its extended ends fixedly connected to the transmission components 33, achieving rigid synchronization of transmission on both sides. The two swing arms 32 are rotatably connected to the vehicle body 10, and the rotation axis of the swing arms 32 is completely coincident with the center of the arc groove 11. The lower ends of the swing arms 32 are connected to the transmission components 33 one-to-one through the connecting components 34, forming a symmetrical linkage mechanism of transmission components 33, connecting components 34, and swing arms 32. The drive component 40 is installed on the vehicle body 10 and is directly connected to the single-sided transmission component 33, providing a power source for the lifting and lowering action. The drive component 40 drives the single-sided transmission component 33 to rotate, and through the rigid transmission of the crossbar 31, achieves synchronous operation of the two transmission assemblies 30, providing stable power for the lifting and lowering of the main brush assembly 20.

[0026] In this embodiment, the height of the main brush can be flexibly adjusted through the cooperation of the drive component 40 and the transmission component 30, adapting to complex scenarios such as uneven road surfaces and garbage accumulation of different thicknesses. It can both clean deeply close to the ground and raise the main brush to reduce wear, solving the adaptation pain points of traditional fixed-height sweepers. The dual-end transmission design of the external rotor motor ensures that the force is evenly distributed at both ends of the roller 21, and the brush strips 22 rotate more smoothly, avoiding uneven cleaning caused by force on one side and improving cleaning cleanliness. The external rotor motor is directly connected to the end cover and connecting cylinder 26, with a short power transmission path and no redundant intermediate parts, reducing power loss; the dual-end transmission chain disperses torque, reducing the load of a single transmission path and improving transmission efficiency and reliability. The rotation axis of the swing arm 32 coincides with the center of the arc groove 11, and combined with the rigid synchronous design of the crossbar 31, it ensures that the lifting action is smooth and without deviation, significantly improving the smoothness of transmission. At the same time, the external rotor motor is integrated inside the hollow roller 21, and the dual-end transmission structure eliminates the need for additional transmission gears or belts, making the overall layout more compact and saving space in the vehicle body 10. The symmetrical design of the transmission on both sides and the synchronous transmission with the crossbar 31 ensure that the main brush assembly 20 remains horizontal when it is raised and lowered, avoiding equipment shaking or uneven force on the bristles caused by tilting. The arc groove 11 limits the fixed shaft 271 and the rotating shaft 23, and combined with the stable support of the swing arm 32, makes the main brush assembly 20 stable in posture during cleaning and raising and lowering, reducing safety risks during operation.

[0027] Furthermore, the transmission assembly 30 also includes two elastic members 35, the lower ends of which are respectively connected to the end of the swing arm 32 away from the main brush assembly 20, and the upper ends are connected to the vehicle body 10; the elastic members 35 are in a stretched state.

[0028] Specifically, in this embodiment, the transmission assembly 30 further includes two elastic members 35, which are adapted to the swing arm 32 and the vehicle body 10 respectively. The upper end of the elastic member 35 is fixedly connected to the end of the swing arm 32 away from the main brush assembly 20, and the other end extends upward and is fixedly connected to the vehicle body 10. The elastic member 35 is always in a stretched state and has a continuous elastic tension. Since one end of the elastic member 35 is connected to the swing arm 32 and the other end is connected to the vehicle body 10 and is in a stretched state, it will apply a continuous upward elastic tension to the end of the swing arm 32 away from the main brush. This tension forms a torque through the rotation connection point of the swing arm 32 (the rotation point between the swing arm 32 and the vehicle body 10), so that the swing arm 32 always has a tendency to apply downward pressure towards the main brush assembly 20. After the swing arm 32 is pulled upward by the elastic element 35, its end near the main brush assembly 20 will generate a downward resisting force on the insertion shaft of the main brush assembly 20. Since the fixed shaft 271 and the rotating shaft 23 are confined within the arc groove 11, this resisting force will be converted into pressure on the main brush assembly 20 along the arc groove 11 to adhere to the ground. The continuous tensile force of the elastic element 35 ensures that the main brush assembly 20 is always subjected to elastic pressure on the ground. When there are slight potholes or bumps on the road surface, the main brush assembly 20 can slide slightly along the arc groove 11. The tension of the elastic element 35 changes dynamically with the stretching length, and the contact pressure between the main brush and the ground is adjusted synchronously to avoid excessive wear of the bristles due to excessive pressure or missed areas due to insufficient pressure, thus further improving the cleaning adaptability of complex road surfaces.

[0029] Furthermore, the hinge axis of the swing arm 32 is located above the arc groove 11, the elastic member 35 is connected to the swing arm 32 at the upper side of the hinge axis, and the connector 34 is connected to the swing arm 32 at the lower side of the hinge axis.

[0030] Specifically, in this embodiment, the hinge axis of the swing arm 32 and the vehicle body 10 is located above the arc-shaped groove 11, forming an upper fulcrum rotation structure, providing a fixed rotation center for the up-and-down swing of the swing arm 32. The connection position of the elastic member 35 and the swing arm 32 is located away from the rotating shaft 23 and the fixed shaft 271, that is, the connection point of the elastic member 35 on the swing arm 32 is far from the rotating shaft 23 and the fixed shaft 271, located at one end of the swing arm 32 away from the main brush assembly 20. The two connection positions of the connector 34 and the elastic member 35 on the swing arm 32 are located on both sides of the rotation axis of the swing arm 32, forming a distribution structure with the rotation axis of the swing arm 32 as the dividing point, and the connector 34 and the elastic member 35 connected at both ends respectively. The elastic member 35 is connected to the upper side of the swing arm 32, and the connector 34 is connected to the lower side of the swing arm 32. Since the connector 34 and the elastic element 35 are located on opposite sides of the rotation axis of the swing arm 32, with the connector 34 closer to the rotating shaft 23 and the fixed shaft 271 and the elastic element 35 farther away from the rotating shaft 23 and the fixed shaft 271, the forces exerted by the two on the swing arm 32 form opposing torques in synergy. The elastic element 35 applies an upward pulling force to the end of the swing arm 32 away from the rotating shaft 23, generating a torque (downward pressure torque) that causes the swing arm 32 to swing downward around the rotation axis toward the main brush assembly 20; the push or pull force generated by the drive of the transmission component 33 on the connector 34 acts on the end of the swing arm 32 closer to the rotating shaft 23, generating an adjusting torque that causes the swing arm 32 to rise and fall around the rotation axis. The two torques, with the rotation axis as the fulcrum, form an efficient torque transmission structure, which can achieve the raising and lowering adjustment of the main brush with a small driving force. Combined with the design of the arc groove 11 coinciding with the rotation axis of the swing arm 32, the positional distribution of the connector 34 and the elastic element 35 on the crossbar 31 and the swing arm 32 further optimizes the motion trajectory control of the main brush. The connector 34 is close to the rotating shaft 23 and the fixed shaft 271, which can precisely drive the rotating shaft 23 and the fixed shaft 271 to slide along the arc groove 11; the elastic element 35 is away from the rotating shaft 23 and the fixed shaft 271 and is on the other side of the rotation axis. The torque generated by its tension can stably act on the swing arm 32, so that the main brush assembly 20 always maintains uniform contact pressure when sliding along the coaxial arc groove 11, thereby improving the cleaning effect.

[0031] Furthermore, the transmission assembly 30 also includes a connecting frame 36, which is L-shaped and includes a horizontal wall 361 and a vertical wall 362. The horizontal wall 361 is fixedly connected to the swing arm 32, and the vertical wall 362 is connected to the connector 34. In this embodiment, the connecting frame 36 is composed of the horizontal wall 361 and the vertical wall 362, forming a right-angle bent structure, which has the functions of rigid connection and force direction transmission. The horizontal wall 361 is fixedly connected to the swing arm 32 (the connection position corresponds to the lower side of the swing arm 32, below the hinge axis), and the vertical wall 362 is fixedly connected to the lower end of the connector 34, forming an intermediate connection structure of swing arm 32-connecting frame 36-connector 34. The L-shaped structure of the connecting frame 36 is precisely adapted to the installation position of the swing arm 32 and the connector 34. The horizontal wall 361 is fixed to the surface of the swing arm 32, and the vertical wall 362 extends vertically to the corresponding connection point of the connector 34, ensuring a smooth force transmission path. The L-shaped connecting frame 36 can flexibly adapt to the installation spacing and position of the swing arm 32 and the connector 34 by adjusting the lengths of the horizontal wall 361 and the vertical wall 362. This reduces the machining accuracy requirements of the swing arm 32 and the connector 34, and improves the overall assembly tolerance. As an independent component, if the connection part of the connector 34 or the swing arm 32 is worn, the connecting frame 36 can be replaced separately instead of replacing the entire swing arm 32 or connector 34, reducing maintenance costs. At the same time, the L-shaped structure provides more space for disassembly and assembly, facilitating tool operation and shortening maintenance time.

[0032] Furthermore, the transmission component 33 includes an integrally connected shaft portion 331, a first connecting plate portion 332, and a second connecting plate portion 333; the first connecting plate portion 332 and the second connecting plate portion 333 are respectively connected to both ends of the shaft portion 331; the first connecting plate portion 332 is connected to the output end of the drive component 40; the second connecting plate portion 333 is connected to the connector 34; the second connecting plate portion 333 is L-shaped and includes a first wall and a second wall, the first wall being connected to the shaft portion 331 and the second wall being connected to the connector 34.

[0033] Specifically, a single transmission component 33 is integrally formed from a shaft portion 331, a first connecting plate portion 332, and a second connecting plate portion 333, resulting in a strong overall structural integrity. The first connecting plate portion 332 and the second connecting plate portion 333 are respectively connected to the two ends of the shaft portion 331. The end away from the shaft portion 331 is fixedly connected (e.g., bolted) to the output end of the drive component 40 (e.g., the output shaft) to receive power from the drive component 40. The second connecting plate portion 333 is generally L-shaped and consists of a first wall and a second wall that are perpendicular (or at an angle) to each other. One end of the first wall is fixedly connected to the end of the shaft portion 331 away from the first connecting plate portion 332, and the other end extends perpendicularly (or at an angle) to form the second wall. The end of the second wall away from the first wall is movably connected to the chain (e.g., by opening a connecting hole and hinged to the chain via a pin), realizing the power transmission between the transmission component 33 and the chain.

[0034] After the drive unit 40 is started, its output end, through a fixed connection with the first connecting plate 332, directly drives the transmission unit 33 to rotate around the axis of the shaft 331 (the shaft 331 is fixed to the crossbar 31, so the rotation direction of the transmission unit 33 is the same as that of the crossbar 31). Since the first connecting plate 332 and the shaft 331 are integrally formed, the power transmission is seamless, avoiding power loss caused by loosening of the splicing structure, and ensuring that the torque of the drive unit 40 can be completely transmitted to the shaft 331. When the shaft 331 rotates, it synchronously drives the integrally connected L-shaped second connecting plate 333 to perform a circular motion around the axis of the shaft 331; the second wall of the second connecting plate 333 is connected to the chain, and its circular motion is converted into a traction force (or thrust) on the chain, driving the chain to move along a preset trajectory. The first and second walls of the L-shaped structure are set perpendicularly to precisely match the angle between the rotation direction of the shaft 331 and the movement direction of the chain (if the shaft 331 rotates, the chain needs to move vertically or at an angle), avoiding lateral force during power transmission. The shaft 331 of the transmission component 33 is fixedly connected to the part of the crossbar 31 extending out of the vehicle body 10 (e.g., interference fit, key connection), and their axes coincide. When one side of the transmission component 33 is driven to rotate by the drive component 40, the shaft 331 directly drives the crossbar 31 to rotate synchronously, and then drives the other side of the transmission component 33 to rotate through the crossbar 31. The structures of the two transmission components 33 are completely identical (the shaft 331, the first connecting plate 332, the L-shaped and the second connecting plate 333 have the same specifications), ensuring that the chains on both sides are subjected to uniform force and move at the same speed, ultimately achieving synchronous lifting and lowering of both ends of the main brush assembly 20.

[0035] Furthermore, connector 34 is a chain.

[0036] Specifically, both connecting parts 34 in the transmission assembly 30 are chains. One end of the chain is fixedly connected to the connecting part 34 (rotating synchronously with the crossbar 31), and the other end is connected to the swing arm 32 near the insertion shaft. After the drive unit 40 is started, its output end drives the transmission unit 33 to rotate, and the transmission unit 33 drives the chain on one side to move upward. Since the transmission unit 33 is fixedly connected to the crossbar 31, and the crossbar 31 passes through the vehicle body 10 and is connected to the transmission unit 33 on the other side, it drives the chain on the other side to move upward, so that the chains on both sides move upward at the same speed. At the same time, the end of the chain away from the crossbar 31 and close to the insertion shaft drives the swing arm 32 to swing around the rotation axis, thereby driving the main brush assembly 20 to slide along the arc groove 11 to achieve the lifting of the main brush. The drive unit 40 can be electrically lifted.

[0037] The chain's flexibility can adapt to the angular changes when the transmission component 33 rotates and the positional shift when the swing arm 32 swings, avoiding stress concentration caused by motion deviation in rigid connections, reducing the impact load on components, and extending the service life of the transmission assembly 30, the swing arm 32, and the insertion shaft.

[0038] Furthermore, the outer surfaces of the first end cap 24 and the second end cap 25 have multiple reinforcing rings 243 protruding outwards, the thickness of the reinforcing rings 243 being between 1.5 mm and 5 mm; the thickness of the first end cap 24 and the second end cap 25 being between 15 mm and 20 mm.

[0039] Specifically, in this embodiment, the reinforcing ring 243 is an annular protrusion integrally formed on the outer surface of the first end cap 24 and the second end cap 25, distributed radially at intervals along the first end cap 24 or the second end cap 25 (e.g., 1-3 rings arranged sequentially from the center of the end cap to the edge), forming a concentric reinforcing layout. Its thickness is controlled within the range of 1.5mm to 5mm, avoiding both insufficient reinforcement due to excessive thinness and excessive thickness that would increase the overall weight and material cost of the first end cap 24 and the second end cap 25. The height and thickness of the reinforcing ring 243 are matched to maximize structural rigidity within a limited space, and the protruding surface is smooth and burr-free, preventing the snagging of debris or scratching of the ground during cleaning operations. The overall thickness of the first end cap 24 and the second end cap 25 is set to 15mm to 20mm, a size that balances structural strength and lightweight requirements. A minimum thickness of 15mm ensures the basic load-bearing capacity of the first end cap 24 and the second end cap 25, preventing deformation or breakage of the mounting holes due to excessive thinness; an upper limit of 20mm controls the weight of the first end cap 24 and the second end cap 25, preventing excessive overall load on the main brush assembly 20 and affecting operational flexibility.

[0040] Furthermore, the sweeper also includes a limiting component 50, which includes a fixing member 51 and an adjusting bolt 52. One end of the adjusting bolt 52 passes through the fixing member 51, and the other end extends toward the swing arm 32. The adjusting bolt 52 is used to limit the lowest position of the swing arm 32.

[0041] Specifically, in this embodiment, the blocking end of the adjusting bolt 52 is used to contact the surface of the swing arm 32 when the swing arm 32 swings downward to a preset position, preventing the swing arm 32 from swinging downward further, thereby limiting the lowest position of the swing arm 32 and indirectly controlling the lowest height of the main brush assembly 20 (avoiding excessive descent of the main brush). When the driving force of the drive member 40 weakens or stops, the tension of the elastic member 35 drives the swing arm 32 to swing downward around the rotation axis, and the main brush assembly 20 descends towards the ground along the arc groove 11 with the rotating shaft 23 and the fixed shaft 271; when the swing arm 32 swings to near the lowest position, the surface of the swing arm 32 contacts the blocking end of the adjusting bolt 52, and the adjusting bolt 52 restricts the swing arm 32 from swinging downward further through mechanical blocking, thereby locking the lowest height of the main brush assembly 20 at the preset position of the adjusting bolt 52, avoiding excessive compression of the bristles 22 against the ground due to excessive descent of the main brush caused by gravity or the tension of the elastic member 35.

[0042] This application allows for quick adjustment of the main brush's minimum height by rotating the adjusting bolt 52, without disassembling the transmission assembly 30 or replacing parts. It adapts to the cleaning needs of different road surfaces (gravel, cement, and paved roads) and debris types (fine dust and large pieces of debris). For example, when cleaning large fallen leaves, the main brush height can be appropriately lowered to enhance the gathering effect; when cleaning sharp gravel, the main brush height can be raised to reduce bristle damage, significantly improving ease of operation.

[0043] Furthermore, both ends of the roller 21 have multiple positioning grooves 211, and the outer peripheral walls of the first end cover 24 and the second end cover 25 have multiple positioning protrusions 241 protruding outward, and the positioning protrusions 241 are inserted into the positioning grooves 211.

[0044] Specifically, in this embodiment, multiple positioning grooves 211 are provided at both ends of the roller 21. The grooves are evenly distributed along the circumferential direction of the end of the roller 21, forming a matching positioning interface with the first end cover 24 and the second end cover 25. Multiple positioning protrusions 241 protrude outward from the outer peripheral walls of the first end cover 24 and the second end cover 25. The number, shape, and distribution spacing of the positioning protrusions 241 are completely matched with the positioning grooves 211 at the end of the roller 21. The precise positioning connection between the roller 21 and the first end cover 24 and the second end cover 25 is achieved by inserting the positioning protrusions 241 into the positioning grooves 211. The positioning protrusions 241 and the positioning grooves 211 form a precise positioning and fixed connection relationship between the roller 21 and the end cover through the insertion fit. After the positioning protrusions 241 are embedded in the positioning grooves 211, they restrict the relative rotation of the roller 21 and the first end cover 24 and the second end cover 25 in the circumferential direction, ensuring that the two move synchronously and avoiding slippage or displacement during transmission. The alignment and insertion design of the positioning protrusion 241 and the positioning groove 211 provides a clear positioning reference for the assembly of the first end cover 24, the second end cover 25, and the roller 21. Assembly can be completed quickly without complex measurements, significantly shortening the assembly time during production or maintenance. The positioning structure has both positioning and auxiliary fixing functions. With the cooperation of fasteners such as bolts, it not only improves the reliability of the connection but also reduces the assembly difficulty. Even non-professionals can quickly disassemble and replace the end covers.

[0045] Furthermore, the outer peripheral walls of the first end cap 24 and the second end cap 25 are recessed inward to form a plurality of connecting channels 242 that connect the interior of the roller 21 to the outside.

[0046] Specifically, in this embodiment, the first end cap 24 and the second end cap 25, as key components connecting the roller 21 and internal parts in the main brush assembly 20, form an inwardly recessed structure on their outer peripheral walls. This recess is not a single groove, but rather multiple independent units spaced apart circumferentially along the first end cap 24 and the second end cap 25, ultimately forming a channel-like connecting channel 242 that connects the interior of the roller 21 to the outside. Morphologically, the connecting channel 242 is recessed inward based on the outer peripheral walls of the first end cap 24 and the second end cap 25, preserving the integrity of the outer peripheral contour of the first end cap 24 and the second end cap 25 in conjunction with the roller 21, while also forming a path connecting the inside and outside through the recessed space. In terms of quantity, the multiple connecting channels 242 are evenly distributed, ensuring a balanced circumferential connection effect of the roller 21 and preventing functional loss in local areas due to the absence of connecting channels 242.

[0047] The drive motor 27 continuously generates heat when it operates at high speed inside the drum 21. A closed structure can easily lead to heat accumulation, causing the motor to overheat and its performance to degrade. However, the connecting channel 242, through its internal and external pathways, allows for natural convection. Low-temperature airflow from the outside enters the drum 21 through the connecting channel 242, exchanges heat with the motor and other heat-generating components, and then exits through other connecting channels 242, achieving passive cooling. This effectively reduces the internal temperature of the drum 21 and extends the service life of components such as the drive motor 27 and bearing 233. The air inside the drum 21 expands when heated. In a closed structure, the internal air pressure would be higher than the external pressure, potentially causing deformation at the mating points of the first end cover 24 and the second end cover 25 with the drum 21, affecting positioning accuracy. The connecting channel 242 can balance the internal and external air pressure of the roller 21 in real time. When the internal air pressure rises, excess air is discharged through the connecting channel 242. When the air pressure drops, external air is introduced to keep the internal and external air pressure consistent. This avoids structural deformation of the first end cover 24, the second end cover 25, and the roller 21 due to air pressure difference, and maintains the assembly accuracy and operational stability of the main brush assembly 20.

[0048] Furthermore, a first sleeve 272 and a first locking member 273 are sequentially sleeved outside the fixed shaft 271; a second sleeve 231, a bearing 233, and a second locking member 232 are sequentially sleeved outside the rotating shaft 23, and the two end caps are pressed onto the two ends of the roller 21 by the first locking member 273 and the second locking member 232 respectively.

[0049] Specifically, in this embodiment, the fixed shaft 271 passes through the center hole of the first end cover 24 and forms a clearance fit with the first end cover 24. The first sleeve 272 is sleeved on the outside of the fixed shaft 271, with one end abutting against the outer side of the end cover and the other end abutting against the first locking member 273. The first locking member 273 is connected to the fixed shaft 271 by thread or snap-fit. When tightened or snapped, axial pressure is applied to the first sleeve 272, and the first sleeve 272 transmits the pressure to the first end cover 24, so that the first end cover 24 is tightly attached to the corresponding end face of the roller 21, thereby achieving axial fixation between the first end cover 24 and the roller 21. The rotating shaft 23 passes through the second end cover 25, and the second sleeve 231 is sleeved on the outside of the rotating shaft 23. One end of the second sleeve 231 abuts against the outer side of the second end cover 25, and the other end abuts against the inner ring of the bearing 233. The inner ring rotates synchronously with the rotating shaft 23. The second locking member 232 is threaded or snap-fitted to the rotating shaft 23. When tightened, it applies axial pressure to the inner ring of the bearing 233. The inner ring of the bearing 233 transmits the pressure to the second end cover 25 through the second sleeve 231, so that the second end cover 25 is also tightly attached to the corresponding end face of the roller 21, forming a bidirectional locking with the side of the fixed shaft 271.

[0050] This application utilizes the bidirectional axial pressure of the first locking member 273 and the second locking member 232 to achieve a gapless fit between the first end cap 24, the second end cap 25, and the two end faces of the roller 21. The positioning protrusions 241 of the first end cap 24 and the second end cap 25 fit more tightly with the positioning grooves 211 of the roller 21, effectively preventing relative loosening of the first end cap 24, the second end cap 25, and the roller 21 due to vibration during high-speed rotation of the main brush assembly 20. This avoids brush rotation trajectory deviation or reduced cleaning efficiency, improving the operational stability of the main brush assembly 20. The axial locking effect of the first locking member 273 and the second locking member 232 can fix the axial position of components such as the fixed shaft 271 of the drive motor 27, the rotating shaft 23, and the bearing 233, preventing collisions or wear caused by axial movement of components during operation of the main brush assembly 20.

[0051] In an optional embodiment, the second end cap 25 is interference-fitted with the rotating shaft 23. Specifically, in this embodiment, the second end cap 25 achieves circumferential positioning by engaging with the positioning groove 211 of the roller 21 through the positioning protrusion 241 on its outer peripheral wall; and the interference fit between the second end cap 25 and the rotating shaft 23 further binds the second end cap 25 and the rotating shaft 23 into a synchronous rotation unit. When the drive motor 27 drives the rotating shaft 23 to rotate, the clamping force generated by the rotating shaft 23 through the interference fit directly drives the end cap to rotate, and the second end cap 25 then drives the roller 21 and brush bristles to rotate through the protrusion and groove engagement structure, forming a rigid transmission chain that avoids transmission delays that may occur in clearance fits. The rigid connection formed by the interference fit eliminates the gap between the second end cover 25 and the rotating shaft 23. The rotational torque of the drive motor 27 can be directly and without delay transmitted to the second end cover 25 through the rotating shaft 23, and then synchronously transmitted to the roller 21 and the brush strip 22. The drive motor 27 drives the first end cover 24 to rotate, and the first end cover 24 then synchronously transmits the torque to the roller 21 and the brush strip 22, making the main brush rotation more coaxial and synchronized, and the cleaning power stronger.

[0052] Furthermore, the connecting cylinder 26 includes a hollow shaft 261 and a flange 262, with the flange 262 fixedly connected to the rotor of the drive motor 27.

[0053] Specifically, in this embodiment, the connecting cylinder 26 has a flange structure, including a hollow shaft 261 and a flange edge 262. The flange edge 262 is fixedly connected to the rotor of the drive motor 27, and the hollow shaft 261 of the connecting cylinder 26 is sleeved on the rotating shaft 23. The flange-type connecting cylinder 26 is rigidly fixed to the rotor of the drive motor 27 through the flange edge 262. The end face of the rotor of the drive motor 27 is a flat mounting surface, and the flange edge 262 fits against this mounting surface, so that the bolt holes of the two are completely aligned; then, bolts are passed through the bolt holes of the flange edge 262 and the mounting holes of the rotor, and tightened to achieve a tight lock between the two. This connection method can limit the relative rotation and axial movement of the connecting cylinder 26 and the rotor, ensuring that the rotational torque output by the motor is transmitted to the connecting cylinder 26 without loss, so that the torque output by the motor can be directly transmitted to the rotating shaft 23 through the rigid structure without slippage or lag.

[0054] Furthermore, the main brush assembly 20 also includes a shock absorber 28 sleeved on the bearing 233. The shock absorber 28 includes an inner ring 281, an outer ring 282, and a rubber ring 283 located between the inner ring 281 and the outer ring 282. The inner ring 281 is sleeved on the bearing 233.

[0055] Specifically, in this embodiment, the shock absorber 28 serves as a vibration buffer component for the main brush assembly 20. The inner ring 281 is a rigid annular component, typically made of metal (such as steel or aluminum alloy) or high-strength engineering plastic. Its inner diameter precisely matches the outer ring diameter of the bearing 233, and its smooth, burr-free inner wall ensures a tight fit around the bearing 233 without radial loosening. The axial length of the inner ring 281 is approximately the same as the width of the bearing 233, completely covering the outer ring and preventing buffering failure due to uneven local stress. The rubber ring 283, located between the inner ring 281 and the outer ring 282, is an elastomer component made of highly elastic, aging-resistant rubber materials (such as natural rubber or nitrile rubber). It is tightly bonded to the inner ring 281 and the outer ring 282 through a vulcanization process. The outer ring 282 is also a rigid annular component, made of the same material as the inner ring 281. The axial length of the outer ring 282 is aligned with that of the inner ring 281 and the rubber ring 283, ensuring that the three-layer structure is subjected to coordinated force and there is no risk of axial misalignment. Unbuffered vibration can easily cause fatigue damage to core components such as the bearing 233, the shaft 23, and the drive motor 27. The rubber ring 283 of the shock absorber 28 can effectively absorb the radial vibration of the shaft 23 during rotation and the axial vibration generated by the impact of the ground. For example, when the main brush encounters a ground protrusion, the impact vibration is transmitted to the shock absorber 28 through the bearing 233. The rubber ring 283 buffers the impact energy through deformation, preventing the main brush assembly 20 from shaking violently.

[0056] Furthermore, multiple bristle strips 22 are evenly arranged around the axis of the roller 21 on the outer periphery of the roller 21.

[0057] Specifically, the main brush assembly 20 consists of a roller 21 and multiple bristle strips 22. The roller 21 has a cylindrical structure. The multiple bristle strips 22 are evenly distributed circumferentially around the axis of the roller 21, with equal included angles between adjacent bristle strips 22 (e.g., when there are 8 bristle strips 22, the included angle between adjacent bristle strips 22 is 45°). Each bristle strip 22 extends along the axial direction of the roller 21, and its root is connected to the outer peripheral wall of the roller 21 by bolts, welding, or embedded fixing. The length of the bristle strips 22 is consistent, ensuring that the bristle ends away from the roller 21 form a complete cylindrical cleaning surface. The multiple bristle strips 22 are evenly distributed around the axis of the roller 21, forming a continuous, gapless cylindrical cleaning surface. When the roller 21 rotates, adjacent bristle strips 22 sequentially contact the ground, continuously combing and sweeping away debris, avoiding missed areas due to excessive gaps between the bristles. At the same time, the evenly distributed bristle strips 22 balance the force on the outer periphery of the roller 21, reduce the vibration when the roller 21 rotates, and avoid additional wear on the insertion shaft and arc groove 11 caused by vibration.

[0058] Furthermore, the bristle strip 22 extends from one end of the roller 21 to the other end; the bristle strip 22 includes a front half 221 and a rear half 222 connected to each other, and the front half 221 and the rear half 222 form a V-shaped structure.

[0059] Specifically, in this embodiment, a single bristle strip 22 extends along the axial direction of the roller 21, covering the entire length of the roller 21 from one end to the other. That is, the two ends of the bristle strip 22 are axially aligned with the two ends of the roller 21, with no axial gap. Each bristle strip 22 is formed by connecting a front half 221 and a rear half 222, forming an overall V-shaped or V-shaped structure. The connection point between the front half 221 and the rear half 222 is the apex of the V-shape, with the apex facing the outer peripheral wall of the roller 21 and fixed to the roller 21. The front half 221 and the rear half 222 extend symmetrically and obliquely from the apex away from the roller 21, forming a preset angle (such as 40°-90°) between them. The rotation direction of the roller 21 is adapted to the driving direction of the sweeper (e.g., the roller 21 rotates clockwise and the sweeper moves forward). At this time, the front half 221 of the V-shaped brush strip 22 faces the driving direction, which can first gather the garbage in front towards the inside of the V-shape, while the rear half 222 assists in pushing from the other side, so that the garbage is stably wrapped in the V-shaped opening, and then rolled into the garbage collection device as the roller 21 rotates. At the same time, the brush strip 22, which extends completely along the axial direction, can prevent the garbage from leaking out from both ends of the roller 21 along the axial direction, ensuring that there are no dead corners in the axial direction.

[0060] Furthermore, the bristle strip 22 is made of nylon (PA66), polyethylene terephthalate (PET), or polybutylene terephthalate (PBT).

[0061] Specifically, in this embodiment, all V-shaped brush strips 22 are made of any one of the following materials: nylon (PA66), polyethylene terephthalate (PET), or polybutylene terephthalate (PBT). Nylon (PA66) possesses excellent toughness and abrasion resistance, making it suitable for cleaning hard waste such as sand and construction debris, or for rough road surfaces, and can withstand high-frequency friction without easily breaking. PET has high rigidity and good antistatic properties, making it suitable for cleaning lightweight waste such as dust and paper scraps, reducing the amount of waste adhering to the surface of the brush strips 22 and improving cleaning cleanliness. PBT has good fatigue resistance and low-temperature resistance, making it suitable for low-temperature environments or long-term continuous operation scenarios, preventing the brush strips 22 from becoming brittle and breaking at low temperatures. All three materials have good elastic recovery, quickly rebounding to their original state during cleaning. Combined with the adjustable height function of the main brush, this ensures that the brush strips 22 make even contact with the ground at different heights, avoiding missed areas or over-sweeping in certain areas. Nylon (PA66), PET, and PBT offer superior abrasion resistance compared to ordinary plastics, reducing wear on the brush strips 22 caused by ground friction. Furthermore, their moisture and UV resistance make them suitable for complex outdoor environments such as rain, snow, and intense sunlight, preventing the brush strips 22 from aging and cracking, and extending their replacement cycle. All three engineering plastics are environmentally friendly materials, unlikely to release harmful substances during high temperatures or friction, making them suitable for urban roads, industrial parks, and other scenarios with high environmental requirements.

[0062] It should be noted that the sweeper of this application also includes two side brush assemblies 60. The two side brush assemblies 60 are installed on both sides of the front of the vehicle body 10 in the width direction. The main brush assembly 20 is installed in the middle of the vehicle body 10 and is located at the rear of the two side brush assemblies 60, so as to realize the collaborative operation logic of side gathering and middle cleaning. During the movement of the vehicle body 10, the side brush assembly 60 gathers the garbage on both sides to the middle, and then the main brush assembly 20 completes the centralized cleaning.

[0063] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A sweeper truck with an adjustable height of a main brush, characterized in that, The utility model relates to a sweeper, which comprises: a vehicle body having an arc-shaped slot on each side in the width direction, the arc-shaped slot extending from the bottom to the top; a main brush assembly comprising a roller, a bristle strip, a rotating shaft, a first end cover, a second end cover, a connecting cylinder, and a driving motor, the roller being hollow, the bristle strip being connected to the outer peripheral wall of the roller, the first end cover and the second end cover being fixedly installed at the two ends of the roller, the driving motor being an external rotor motor, the driving motor having a fixed shaft connected to the stator of the driving motor, the first end cover being fixedly connected to one end of the rotor of the driving motor, the two ends of the connecting cylinder being connected to the other end of the rotor and the rotating shaft respectively, the rotating shaft and the fixed shaft penetrating through the second end cover and the first end cover respectively, the driving motor driving the first end cover to rotate so as to drive the roller and the bristle strip to rotate, and the driving motor driving the connecting cylinder and the rotating shaft to rotate, the rotating shaft driving the second end cover to rotate, the second end cover driving the roller and the bristle strip to rotate so as to perform a cleaning operation, the fixed shaft and the rotating shaft penetrating into the two arc-shaped slots respectively; a transmission assembly comprising a cross bar, two swing arms, two transmission members, and two connecting members, the cross bar penetrating through the vehicle body in the width direction, the two transmission members being fixedly connected to the part of the cross bar extending out of the vehicle body, the two swing arms being rotatably connected to the two sides in the width direction of the vehicle body, the rotation axis of the swing arm coinciding with the center of the arc-shaped slot, the lower ends of the two connecting members corresponding to the swing arms, and the upper ends of the two connecting members corresponding to the transmission members; a driving member installed on the vehicle body and in transmission connection with one of the transmission members, the driving member driving the transmission member to rotate, the transmission member driving the connecting member to ascend and descend, and the connecting member driving the main brush assembly to ascend and descend along the arc-shaped slot.

2. The master brush height adjustable sweeper of claim 1 wherein, The transmission assembly further comprises two elastic members, the lower ends of the two elastic members being connected to one end of the swing arm away from the main brush assembly, and the upper ends of the two elastic members being connected to the vehicle body; the elastic member is in a stretched state.

3. The master brush height adjustable sweeper of claim 2 wherein, The transmission member comprises an integrated shaft portion, a first connecting plate portion, and a second connecting plate portion, the first connecting plate portion and the second connecting plate portion being connected to the two ends of the shaft portion respectively, the first connecting plate portion being connected to the output end of the driving member, the second connecting plate portion being connected to the connecting member, and the second connecting plate portion being L-shaped and comprising a first wall and a second wall, the first wall being connected to the shaft portion, and the second wall being connected to the connecting member.

4. The brush height adjustable sweeper as set forth in claim 3, wherein The connecting member is a chain.

5. The master brush height adjustable sweeper of claim 3 wherein, The outer surface of the end cover protrudes outwardly a plurality of reinforcing convex rings, the thickness of the reinforcing convex ring being between 1.5 mm and 5 mm, and the thickness of the end cover being between 15 mm and 20 mm.

6. The brush height adjustable sweeper as set forth in claim 3, wherein The sweeper further comprises a limiting assembly, the limiting assembly comprising a fixing member and an adjusting bolt, one end of the adjusting bolt penetrating through the fixing member and the other end of the adjusting bolt extending towards the swing arm, and the adjusting bolt being used to define the lowest position of the swing arm.

7. The brush height adjustable sweeper as set forth in claim 3, wherein The two ends of the roller have a plurality of positioning grooves, and the outer peripheral walls of the first end cover and the second end cover outwardly protrude a plurality of positioning protrusions which are inserted into the positioning grooves.

8. The brush height adjustable sweeper as set forth in claim 7, wherein The outer peripheral walls of the first end cover and the second end cover are inwardly recessed to form a plurality of communication channels which communicate the interior of the roller with the outside.

9. The master brush height adjustable sweeper of claim 8 wherein, The fixing shaft further has a first sleeve and a first locking member which are sequentially sleeved on the fixing shaft, and the rotating shaft further has a second sleeve, a bearing and a second locking member which are sequentially sleeved on the rotating shaft, and the first end cover and the second end cover are respectively pressed on the two ends of the roller by the first locking member and the second locking member.

10. The master brush height adjustable sweeper of claim 9 wherein, The main brush assembly further comprises a shock absorber which is sleeved on the bearing, and the shock absorber comprises an inner ring, an outer ring and a rubber ring between the inner ring and the outer ring, and the inner ring is sleeved on the bearing.

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