A hand-held leaf sweeper

Abstract

This utility model provides a hand-held leaf sweeper, relating to the field of sweeping equipment. It includes a walking mechanism, a handrail, and a housing with a cavity structure. The housing has an inlet at the bottom and an outlet at the rear. A storage structure is connected to the outlet and has a breathable mesh. A sweeping brush is positioned below the inlet, with its throwing direction facing the inlet. The output shaft of the power unit extends into the inner cavity of the housing. This utility model lifts the inlet instead of bringing it close to the road surface, and the sweeping brush sweeps leaves upwards to the inlet. A deflector rotates with the output shaft, creating a pressure difference between the inner cavity of the housing and the inlet. This generates centrifugal force that throws the swept material from the inlet towards the outlet. This not only allows for the smooth sweeping and collection of various leaves into the storage mechanism but also avoids the excessive dust problem caused by using negative pressure fans for leaf adsorption in existing leaf sweeping machinery, and also avoids the need for repeated filter replacements that affect work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, specifically to a hand-held leaf sweeper. Background Technology

[0002] In urban sanitation and cleaning work, sweeping up leaves, scraps of paper, etc., is a common task. Currently, the main method of mechanical sweeping is using street sweepers, including ride-on and walk-behind models. However, both types of sweepers have the following problems: 1. The current sweeping method uses side brushes to sweep up and gather leaves, and then sucks the gathered leaves into the storage tank through the central suction port under the action of a negative pressure fan. In this method, if the suction port is close to the ground, broad leaves such as sycamore leaves will accumulate and block the suction port during the sweeping process, preventing them from entering. If the suction port is far from the ground, narrow leaves such as willow leaves are not easily sucked into the suction port. At the same time, even if the sweeper's suction port is very close to the ground, it cannot suck up leaves that are already attached to the ground. 2. Current sweepers rely on filter cartridges for negative pressure absorption to prevent dust generation. However, this presents a significant problem: lightweight materials like leaves and paper easily adhere to and coat the filter cartridge. Backflushing or tapping the filter doesn't easily dislodge these materials, leading to reduced airflow and suction power, resulting in poorer sweeping performance. Manually cleaning the filter cartridge is also inconvenient and labor-intensive. Given this situation, current technology requires a certain airflow to achieve negative pressure absorption of leaves through the suction head. Insufficient airflow hinders leaf absorption, while high airflow, while effective for leaf absorption, easily leads to leaves covering the filter cartridge, significantly reducing airflow at the negative pressure absorption port and further impairing leaf absorption. While eliminating the filter cartridge structure avoids the negative impact of leaves covering the filter cartridge under high airflow, the resulting high-volume negative pressure absorption would cause severe dust generation.

[0003] Given the numerous problems associated with machine cleaning, it is well known that even in some large cities, leaf removal in cities still relies on manual labor, which is labor-intensive and inefficient.

[0004] In the prior art, patent document CN217781851U discloses an integrated sweeper for cleaning water-covered leaves. This sweeper uses brush discs on both sides to gather leaves inwards, while a main brush roller sweeps backwards to scrape leaves adhering to the ground. Finally, the leaves are sucked into a collection box by a suction head powered by a negative pressure fan at the rear. While this solves the problem of water-covered leaves easily adhering to the road surface and causing inconvenience in cleaning, it still suffers from the aforementioned technical problems caused by using a negative pressure fan to suction the leaves.

[0005] Therefore, the technical problem to be solved in this application is how to overcome the contradictions in the above-mentioned technical problems, so as to ensure the cleaning effect on various types of leaves, avoid excessive dust, and meet the cleaning needs in narrow areas such as sidewalks. Utility Model Content

[0006] This utility model addresses the aforementioned problems in the prior art by providing a hand-held street sweeper that avoids the use of negative pressure fans and filter elements in the prior art. It can ensure the sweeping effect on various types of leaves, and at the same time, it can avoid excessive dust without the filter element structure. Moreover, the overall structure is compact and miniaturized, making it convenient for sweeping work on sidewalks and in narrow areas.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A hand-held leaf sweeper, including a walking mechanism and a handrail disposed on the rear side of the machine, characterized in that it further includes...

[0008] The housing has a cavity structure, with an inlet at the bottom communicating with the inner cavity and an outlet at the rear communicating with the inner cavity.

[0009] A storage structure is connected to the outlet, and the storage mechanism has a breathable mesh.

[0010] A cleaning brush is installed on the lower side of the inlet, and the direction of the cleaning brush's material throwing is towards the inlet;

[0011] The power unit is located above the housing, and the output shaft of the power unit extends into the inner cavity of the housing;

[0012] A baffle plate is installed in the inner cavity of the housing. The baffle plate is fixedly connected to the output shaft along the same axis. The baffle plate rotates with the output shaft to form a pressure difference between the inner cavity of the housing and the inlet, and at the same time, it forms a centrifugal force to throw the sucked-in cleaning material to the outlet.

[0013] Furthermore, the inner cavity of the housing has a circular cross-section to accommodate the rotation trajectory of the dial plate along the output shaft, and the outlet is located in the tangential direction of the housing.

[0014] Furthermore, the dial or a portion thereof forms a predetermined angle with the horizontal plane.

[0015] In one embodiment of this utility model, the lever is a strip-shaped plate structure with its side edges bent upward to form an inclined surface.

[0016] In one embodiment of this utility model, the dial plate is an inclined plate structure.

[0017] In another embodiment of this utility model, the side edge of the dial is twisted upward at a predetermined angle.

[0018] Furthermore, a preset distance is maintained between the bottom end of the dial plate and the inlet.

[0019] Furthermore, the cleaning brush is provided in two parts and arranged in a front-to-back manner. In the working state, the two cleaning brushes rotate relative to each other, with a preset gap between them, and the gap is located directly below the inlet.

[0020] Furthermore, the sweeping brush is rotatably connected to the machine body, and the machine body is connected to the walking mechanism through a lifting mechanism, which is used to adjust the height of the sweeping brush relative to the ground.

[0021] Furthermore, the sweeping brush is a cylindrical roller sweeping brush, and the hand-held leaf sweeper also includes an auxiliary sweeping brush located on the front side of the machine body, specifically a disc sweeping brush, which is connected to the machine body via a liftable bracket.

[0022] Furthermore, the power unit is connected to the sweeping brush via a transmission mechanism to drive the sweeping brush, i.e., one power source drives both the lever and the sweeping brush simultaneously; or, the power unit is connected to the walking mechanism and the sweeping brush via a transmission mechanism to drive both the walking mechanism and the sweeping brush separately, i.e., one power source drives the lever, the sweeping brush, and the walking mechanism simultaneously.

[0023] The beneficial effects of this utility model are as follows: This utility model features a housing with an inner cavity, an inlet at the bottom corresponding to the throwing direction of the sweeping brush located below the inlet. A baffle plate positioned within the housing cavity above the inlet, unlike existing technologies where the suction port is close to the road surface, lifts the inlet upwards instead of bringing it close. The sweeping brush below sweeps leaves upwards to the inlet. The baffle plate is coaxially and fixedly connected to the output shaft of the power unit, creating a pressure difference between the housing cavity and the inlet as the baffle plate rotates with the output shaft. This creates a centrifugal force that throws the swept material from the inlet towards the outlet. This not only effectively sweeps and collects broad leaves like sycamore leaves and narrow leaves like willow leaves into the storage mechanism, but also avoids the excessive dust problem caused by using negative pressure fans for leaf adsorption in existing leaf sweeping machines, and the inefficiency caused by repeated filter replacements, all without the need for additional filter elements. The overall structure of this utility model is compact and miniaturized, facilitating sweeping work on sidewalks and in confined areas. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0026] Figure 3 This is a top view of an embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional structural schematic diagram of an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection structure between the lever plate and the power unit according to an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the dial plate according to another embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the dial plate in another embodiment of this utility model;

[0031] Figure 8 , Figure 9 This is a schematic diagram of the connection structure between the walking mechanism and the lifting mechanism according to an embodiment of this utility model;

[0032] Figure 10 , Figure 11 This is a partial cross-sectional structural schematic diagram of a lifting mechanism according to an embodiment of the present invention;

[0033] In the diagram: 1. Machine body, 2. Handrail, 3. Machine casing, 31. Inlet, 32. Outlet, 4. Material storage mechanism, 41. Mesh, 5. Sweeping brush, 51. Front sweeping brush, 52. Rear sweeping brush, 53. Front baffle, 54. Rear baffle, 6. Power unit, 61. Output shaft, 7. Paddle plate, 71. Inclined surface, 8. Disc sweeping brush, 81. Four-link lifting bracket, 91. Traveling wheel, 911. Front wheel, 912. Rear wheel, 92. Axle 101. Control lever, 102. Linkage rod, 103. Front wheel bracket, 104. Rear wheel bracket, 105. Adjusting lever, 106. Handwheel, 107. Lead screw, 1071. Anti-rotation groove, 108. Lead screw support sleeve, 109. Inner threaded sleeve, 110. Connector, 111. Hinge seat, 112. Slot, 113. Fastener, 114. Elastic element, 115. Push rod, 116. Anti-rotation pin, 117. Adjusting plate, 118. Connecting plate. Detailed Implementation

[0034] The principles and features of this utility model are described below. The embodiments given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0035] Example 1

[0036] like Figures 1-5 As shown, the walk-behind leaf sweeper of this embodiment includes a walking mechanism and a handrail 2 disposed on the rear side of the machine body 1. The walking mechanism of this embodiment is a walking wheel 91, including a front wheel 911 and a rear wheel 912. The walk-behind leaf sweeper also includes:

[0037] The housing 3 has a cavity structure, with an inlet 31 at the bottom communicating with the inner cavity and an outlet 32 ​​at the rear communicating with the inner cavity.

[0038] The storage mechanism 4 is connected to the outlet 32. In this embodiment, the storage mechanism 4 is a storage bag with a breathable mesh 41, i.e., a mesh bag structure. In other embodiments, a storage box structure with a breathable mesh 41 on the side wall can also be used.

[0039] A cleaning brush 5 is disposed on the lower side of the inlet 31, and the material throwing direction of the cleaning brush 5 is towards the inlet 31. In this embodiment, the cleaning brush 5 is a cylindrical roller cleaning brush.

[0040] The power unit 6 is located above the housing 3, and the output shaft 61 of the power unit 6 extends into the inner cavity of the housing 3 through the top; the power unit 6 can adopt existing technology structures such as gasoline engine, drive motor or hydraulic motor;

[0041] The baffle plate 7 is set in the inner cavity of the housing 3. The bottom end of the baffle plate 7 is left with a preset distance from the inlet 31. The baffle plate 7 is fixedly connected to the output shaft 61 along the same axis. The baffle plate 7 rotates with the output shaft 61 to form a pressure difference between the inner cavity of the housing 3 and the inlet 31. At the same time, it forms a centrifugal force to throw the sucked-in cleaning material towards the outlet 32, which has a binding effect on the leaves and can effectively complete the cleaning and collection of the leaves.

[0042] The hand-held leaf sweeper of this embodiment does not include a filter structure.

[0043] During operation, this embodiment differs from existing technologies that purely utilize negative pressure fans to suction leaves into the collection box. Instead, it utilizes the aforementioned cooperation between the sweeping brush 5 and the deflector plate 7. The power unit drives the deflector plate 7 to rotate via the output shaft 61. The sweeping brush 5 throws the leaves upwards to the inlet 31. When the deflector plate 7 rotates, it creates a pressure difference between the inner cavity of the housing 3 and the inlet 31, specifically a micro-pressure difference. This micro-pressure difference is sufficient to suck the leaves swept into the inlet 31 by the sweeping brush 5 to the top of the deflector plate. Combined with the movement of the deflector plate 7, it creates a centrifugal force that throws the swept material towards the outlet 32, enveloping the leaves and ultimately throwing them to the outlet 32, where they enter the storage mechanism 4. This not only allows for the smooth sweeping and collection of broad leaves such as sycamore leaves and narrow leaves such as willow leaves into the storage mechanism 4, but also eliminates the need for an additional filter structure. It also avoids the excessive dust problem caused by the use of negative pressure fans in existing leaf sweepers and the impact on work efficiency caused by filter replacement.

[0044] In the above embodiments, in addition to the above-mentioned throwing function, the deflector also has the function of crushing leaves, so that the leaves can enter the storage mechanism 4 after being crushed, avoiding the accumulation of larger leaves in the storage mechanism 4. The crushed leaves are more conducive to the storage mechanism 4 storing more materials and extending the cleaning cycle of the storage mechanism 4.

[0045] Practice has shown that the hand-held leaf sweeper of this embodiment is effective in cleaning broad leaves such as sycamore leaves and narrow leaves such as willow leaves on municipal roads, with no leaves left behind, and no significant dust generated at the four storage locations.

[0046] In this embodiment, see Figure 2 As shown, the inner cavity cross-section (horizontal section) of the housing 3 is circular to accommodate the rotation trajectory of the dial plate 7 with the output shaft 61, and an outlet 32 ​​is provided in the tangential direction of the housing 3 so that the dial plate 7 can directly deliver the material to the outlet 32.

[0047] In this embodiment, the deflector 7 is a strip-shaped plate structure with its side edges bent upwards to form an inclined surface 71. Specifically, one side edge at one end is bent upwards to form an inclined surface 71, and the other side edge at the other end is bent upwards to form an inclined surface 71. This inclined surface creates a certain angle between the side edge of the deflector 7 and the horizontal plane. As the deflector 7 rotates with the output shaft 61, a pressure difference is generated between the inner cavity of the housing 3 and the inlet 31 at the deflector 7, thus generating an upward suction force. Simultaneously, the movement of the deflector 7 creates a centrifugal force that throws the sucked-in cleaning material towards the outlet 32, ultimately guiding the leaves through the outlet 32 ​​into the storage mechanism 4.

[0048] Example 2

[0049] The structure of the hand-held leaf sweeper in this embodiment is basically the same as that in Embodiment 1. The difference is that the lever 7 in this embodiment is an inclined plate structure, see Figure 6 As shown, the middle part of the baffle plate 7 is fixedly connected to the output shaft 61 via a mounting base. Utilizing the inclined plate structure of the baffle plate 7, the side edge of the baffle plate 7 forms a certain angle with the horizontal plane. During the rotation of the baffle plate 7 with the output shaft 61, a pressure difference is generated between the inner cavity of the housing 3 and the inlet 31 at the baffle plate 7, which generates an upward suction force. At the same time, combined with the movement of the baffle plate 7, a centrifugal force is generated to throw the sucked-in cleaning material toward the outlet 32, ultimately allowing the leaves to enter the storage mechanism 4 through the outlet 32.

[0050] Example 3

[0051] The structure of the hand-held leaf sweeper in this embodiment is basically the same as that in Embodiment 1. The difference is that the lever 7 in this embodiment has a curved panel structure, specifically, its side edge is twisted upward at a certain angle. See Figure 7As shown, the middle part of the baffle plate 7 is fixedly connected to the output shaft 61 via a mounting base. Utilizing the upward twisting structure of the baffle plate 7, a certain angle is formed between the two sides of the baffle plate 7. During the rotation of the baffle plate 7 with the output shaft 61, a pressure difference is generated between the inner cavity of the housing 3 and the inlet 31 at the baffle plate 7, which generates an upward suction force. At the same time, combined with the movement of the baffle plate 7, a centrifugal force is generated to throw the sucked-in cleaning material toward the outlet 32, ultimately allowing the leaves to enter the storage mechanism 4 through the outlet 32.

[0052] In the above embodiments, different dial plate structures are exemplified respectively. The dial plate as a whole or in part is at a certain angle to the horizontal plane, thereby creating a pressure difference between the inner cavity of the housing 3 and the inlet 31 when the dial plate rotates with the output shaft. However, this is not a limitation on the scope of protection of this utility model. Any dial plate structure that can create a pressure difference between the inner cavity of the housing 3 and the inlet 31 when rotating, thereby generating an upward suction effect, falls within the scope of protection of this utility model.

[0053] Based on the above embodiments, in a preferred embodiment of this utility model, two cleaning brushes 5 are provided and arranged in a front-to-back manner, see... Figure 4 As shown, the two cleaning brushes (front cleaning brush 51 and rear cleaning brush 52) rotate relative to each other in the working state, with a preset gap between them. This gap is located directly below the inlet 31, and both brushes throw material towards the inlet 31. Compared to using only one cleaning brush, this method achieves better cleaning of leaves. In the above embodiment, the same cleaning effect can also be achieved using only one cleaning brush (rear cleaning brush 52). In this case, the single cleaning brush is positioned directly below and slightly behind the inlet 31, and it sweeps forward while sending leaves upward to the inlet 31.

[0054] More preferably, an arc-shaped baffle, i.e. a rear baffle 54, adapted to the rotation trajectory of the sweeping brush is provided on the rear side of the sweeping brush, i.e. the rear side of the rear sweeping brush 52. This can effectively prevent leaves from being carried to the rear side of the rear sweeping brush 52 and facilitate the smooth delivery of leaves into the inlet 31. In other embodiments, a front baffle 53 and a rear baffle 54 can be provided on the front side of the front sweeping brush 51 and the rear side of the rear sweeping brush 52, respectively, as shown in the figure.

[0055] Based on the above embodiments, in a preferred embodiment of this utility model, to enable the sweeping brush to be placed on the ground during operation and raised when moving between locations or passing through areas that do not require cleaning, the sweeping brush 5 and the machine body 1 are configured to have an adjustable height relative to the traveling wheels. Specifically, the sweeping brush 5 is rotatably connected to the machine body 1, the machine body 1 is fixed to the housing 3, and the machine body 1 is connected to the traveling mechanism through a lifting mechanism for adjusting the height of the sweeping brush 5 relative to the traveling mechanism, and the lifting is controlled by the control lever 101.

[0056] See Figure 8As shown, the two front wheels 911 are connected by a front wheel frame 103, and the two rear wheels 912 are connected by a rear wheel frame 104. The lower end of the control lever 101 is hinged to a hinge seat 111 fixed to the body 1. The lifting mechanism includes a connecting rod 102, which is movably connected to the control lever 101. The connecting rod 102 is connected to the front wheels 911 and the rear wheels 912 through the front wheel frame 103 and the rear wheel frame 104, respectively. Both the front wheel frame 103 and the rear wheel frame 104 include an adjusting plate 117, a connecting plate 118, and a connecting member 110. The adjusting plate 117 and the connecting plate 118 are connected by the connecting member 110. In this embodiment, the connecting member 110 is a rod structure. The outer sides of the adjusting plate 117 and the connecting plate 118 of the front wheel frame 103 are rotatably connected to the two front wheels 911 via axles 92, and the outer sides of the adjusting plate 117 and the connecting plate 118 of the rear wheel frame 104 are rotatably connected to the two rear wheels 912 via axles 92. The connecting rod 102 is hinged to the two adjusting plates 117. The body 1 is rotatably connected to the adjusting plate 117 via the connecting member 110, and the body 1 and the connecting member 110 are relatively fixed in the vertical direction. In this embodiment, the adjusting plate 117 is configured as a crank arm structure. The lines connecting the three connection points of the adjusting plate 117 corresponding to the connecting rod 102, the traveling wheel and the connecting member 110 form a triangle. Under the drive of the control lever 1, the connecting rod 102 can drive the two adjusting plates 117 to rotate around the connecting member 110 to adjust the height of the body 1 relative to the traveling wheel. The control lever 1 is also connected to a first limiting member for limiting its rotation relative to the body 1.

[0057] When traversing sections of road that do not require sweeping or when relocation is needed, push the control lever 101 forward, causing the connecting rod 102 to move forward. This, in turn, causes the front wheel frame 103 and the rear wheel frame 104 to rotate around the two connecting members 110. Since the two sets of wheels are always in contact with the ground, during the rotation, the connecting member 110, along with the machine body 1 and the sweeping brush 5, is lifted as a whole, and the sweeping brush detaches from the ground for quick relocation. Conversely, when it is necessary to lower the sweeping brush, simply operate the control lever 101 in the opposite direction to adjust the sweeping brush to fall with the machine body 1 until the brush bristles slightly touch the ground, so as to sweep away leaves rather than excessively sweeping dust. The lifting and adjusting mechanism of this embodiment facilitates the rapid lifting of the sweeping brush assembly, enabling quick relocation of the entire machine.

[0058] In one specific embodiment, the first limiting member is a locking member 113 fixed on the control lever 101. The hinge seat 111 is provided with a slot 112 for locking the locking member 113. Different slots 112 can be set according to specific adjustment requirements, and the slots 112 of different positions are arranged along the control lever 101 around its rotation direction with the hinge seat 111. Specifically, the locking member 113 is a locking block structure, which protrudes outward from the outer wall of the control lever 101 and is slidably connected to the control lever 101. Inside the control lever 101, on the lower side of the locking member 113, is an elastic member 114 for driving the locking member 113 toward the slot. The elastic member 114 can specifically be a spring structure. The locking member 113 is fixedly connected to a push rod 115, which is axially arranged inside the control lever 101 and has its end protruding outward from the control lever 101. In its natural state, the locking member 113 is engaged in the slot 112 by the force of the spring, which restricts the rotation of the control lever 101. When it is necessary to operate the control lever 101 to rotate around the hinge seat 111, the push rod 115 is pressed down to make the locking member 113 disengage from the slot 112.

[0059] Based on the above embodiments, in a preferred embodiment of the present invention, in order to accurately control the adjustment height of the sweeping brush during the lowering process, the lifting mechanism further includes a fine-tuning mechanism connected between the control lever 101 and the connecting rod 102. The fine-tuning mechanism includes an adjusting rod 107, an adjusting rod support sleeve 108 sleeved outside the adjusting rod 107, and an inner threaded sleeve 109 sleeved outside the adjusting rod 107. The adjusting rod 107 is movably connected to the control lever 101 through the adjusting rod support sleeve 108, and the adjusting rod 107 is movably connected to the connecting rod 102 through the inner threaded sleeve 109. The adjusting rod 107 is used to drive the connecting rod 102 to move when it rotates. A handwheel 106 is connected to the top of the adjusting rod 107 to control the rotation of the adjusting rod 107. Specifically, the adjusting rod support sleeve 108 is hinged externally to the control rod 101, and internally rotatably connected to the adjusting rod 107. The adjusting rod support sleeve 108 and the adjusting rod 107 are relatively fixed relative to each other in the axial direction of the adjusting rod 107. The adjusting rod 107 is threadedly connected to the inner threaded sleeve 109, and the inner threaded sleeve 109 is hinged to the connecting rod 102. The adjusting rod 107 is also connected to a second limiting member for restricting its rotation relative to the adjusting rod support sleeve 108.

[0060] In use, first, use the control lever 101 to lower the sweeping brush 5 to the preset height. Then, for fine-tuning of the sweeping brush assembly, rotate the handwheel 106 to rotate the adjusting rod 107 relative to the adjusting rod support sleeve 108. The adjusting rod 107 generates linear movement relative to the inner thread sleeve 109, which in turn drives the connecting rod 102 to move. The connecting rod 102 drives the front wheel frame 103 and the rear wheel frame 104 to rotate around the axes of the two connecting parts 110 respectively. Since the traveling wheels are always in contact with the ground, during fine-tuning, the connecting parts 110, along with the machine body 1 and the sweeping brush 5, descend as a whole until the desired sweeping brush height is reached. This method of using the control lever 101 for coarse adjustment of the sweeping brush and the adjusting lever 107 and handwheel 106 for fine-tuning of the sweeping brush assembly allows for precise control of the sweeping brush's height adjustment. It also allows for rapid relocation of the entire machine by quickly raising the sweeping brush assembly.

[0061] In one embodiment, the second limiting member is an anti-rotation pin 116 that penetrates the side wall of the adjusting rod support sleeve 108 and whose end tends toward the adjusting rod 107. The outer wall of the adjusting rod 107 is provided with an anti-rotation groove 1071 that is adapted to the anti-rotation pin 116 along its circumference. The pin of the anti-rotation pin 116 is connected to an elastic member 114 for driving its inner end toward the anti-rotation groove 1071. Specifically, a spring structure can be adopted. By moving the pin of the anti-rotation pin 116 outward, the restriction on the adjusting rod 107 can be released. After the height of the cleaning brush 5 is adjusted, moving the pin of the anti-rotation pin 116 inward through the elastic member and pressing the pin into the anti-rotation groove 1071 can fix the position of the adjusting rod 107.

[0062] Based on the above embodiments, in a preferred embodiment of this utility model, the hand-held leaf sweeper further includes a disc-type sweeping brush 8 disposed on the front side of the machine body 1. Specifically, it is a disc brush located on the outer front side of the machine body 1. The number of disc brushes can be designed as one or two as shown in the attached drawings, depending on actual needs. The function of the disc brush is twofold: first, to clean leaves near the roadside that are inconvenient for the main unit to reach; and second, to concentrate the leaves towards the center in front of the sweeping brush 5 so that the leaves fall into the working range of the sweeping brush 5. Then, the sweeping brush 5 sweeps the leaves to the inlet 31. That is, the disc-type sweeping brush 8 acts as a secondary brush for gathering, and the roller-type sweeping brush 5 acts as the main brush for sweeping. Preferably, the disc-type sweeping brush 8 can be set to be height-adjustable, lowered during operation and raised during relocation; specifically, it is connected to the machine body 1 through a liftable bracket, such as... Figure 1 As shown, the disc cleaning brush 8 is connected to the machine body 1 via a four-bar linkage lifting bracket 81.

[0063] Based on the above embodiments, in a preferred embodiment of this utility model, the power unit 6 is connected to the sweeping brush 5 via a transmission mechanism to drive the sweeping brush 5, that is, one power source simultaneously drives the lever and the sweeping brush. In other embodiments, the power unit 6 can also be connected to the walking mechanism and the sweeping brush separately via a transmission mechanism to drive the walking mechanism and the sweeping brush separately, that is, one power source simultaneously drives the lever, the sweeping brush, and the walking mechanism. This structure, in which the same power source drives multiple components, can reduce the number of power sources used, thereby reducing the overall weight of the machine, making the walk-behind leaf sweeper more convenient to use and easier to transport and operate.

[0064] Comparative Example 1

[0065] The leaf sweeper in this comparative example is basically the same as that in Example 1. The difference is that this comparative example does not have a sweeping brush 5. Instead, the position of the housing 3 is lowered so that its inlet 31 is close to the ground and is basically at the same height as the lower end of the sweeping brush 5 in Example 1. The working conditions of the power unit are also the same as those in Example 1.

[0066] Experimental results show that, after starting the power unit, the leaf removal effect on the road surface is acceptable, with a small amount of leaves scattered. There is slight dust generation at the four storage locations, and the dust control effect of Example 1 is significantly better than that of the comparative example. However, when cleaning broad leaves such as sycamore leaves and narrow leaves such as willow leaves, the height of inlet 31 relative to the ground needs to be adjusted. Specifically, when cleaning broad leaves such as sycamore leaves, the height of inlet 31 can be adjusted to be slightly higher, while when cleaning narrow leaves such as willow leaves, the height of inlet 31 needs to be appropriately lowered.

[0067] Overall, considering the degree of leaf removal and dust generation, the sweeper in this comparative example is less effective than that in Example 1.

Claims

1. A hand-held leaf sweeper, comprising a walking mechanism and a handrail (2) disposed on the rear side of the machine body (1), characterized in that, Also includes The housing (3) has a cavity structure, with an inlet (31) at the bottom that communicates with the inner cavity and an outlet (32) at the rear that communicates with the inner cavity. A storage mechanism (4) is connected to the outlet (32), and the storage mechanism (4) has a breathable mesh. A cleaning brush (5) is provided on the lower side of the inlet (31), and the material throwing direction of the cleaning brush (5) is towards the inlet (31). The power unit (6) is located above the housing (3), and the output shaft (61) of the power unit (6) extends into the inner cavity of the housing (3); The baffle (7) is set in the inner cavity of the housing (3). The baffle (7) is fixedly connected to the output shaft (61) along the same axis. The baffle (7) rotates with the output shaft (61) to form a pressure difference between the inner cavity of the housing (3) and the inlet (31), and at the same time forms a centrifugal throwing force that throws the sucked cleaning material toward the outlet (32).

2. The hand-held leaf sweeper of claim 1, wherein The inner cavity of the housing (3) has a circular cross-section to accommodate the rotation trajectory of the dial (7) along the output shaft (61), and the outlet (32) is located in the tangential direction of the housing (3).

3. The hand-held leaf sweeper of claim 1 wherein, The dial (7) or a portion thereof forms a preset angle with the horizontal plane.

4. The hand-held leaf sweeper of claim 1 or 3, wherein The lever (7) is a strip plate structure, with its side edge bent upward to form an inclined surface (71).

5. The hand-held leaf sweeper according to claim 1 or 3, characterized in that, The dial plate (7) has an inclined plate structure.

6. The hand-held leaf sweeper of claim 1 or 3, wherein The side edge of the dial (7) is twisted upward at a preset angle.

7. The walk-behind leaf sweeper of claim 1, wherein The cleaning brush (5) is provided in two and arranged in front and behind. In the working state, the two cleaning brushes (5) rotate relative to each other, with a preset gap between them, and the gap is located directly below the inlet (31).

8. The hand-held leaf sweeper of claim 1 or 7, wherein The cleaning brush (5) is rotatably connected to the machine body (1), and the machine body (1) is connected to the walking mechanism through the lifting mechanism to adjust the height of the cleaning brush (5) relative to the ground.

9. The walk-behind leaf sweeper of claim 1, wherein, The cleaning brush (5) is a roller cleaning brush. The hand-held leaf sweeper also includes a disc cleaning brush (8) located on the front side of the machine body (1), which is connected to the machine body (1) through a liftable bracket.

10. The walk-behind leaf sweeper of claim 9, wherein, The power unit (6) is connected to the walking mechanism, the sweeping brush (5) and the disc sweeping brush (8) respectively through the transmission mechanism, and is used to drive the walking mechanism, the sweeping brush (5) and the disc sweeping brush (8) to run from the same power source.

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