Hand-held movable ground cleaning machine

Abstract

An engine is installed on the top of a machine frame, wheels are installed on the two sides of the bottom of the rear end of the machine frame, control handrails are connected to the two sides of the rear end of the machine frame, and an engine belt wheel is arranged at the lower end of an output shaft of the engine. The engine belt wheel is sequentially in transmission connection with a first tensioning wheel, a first transmission belt wheel and a second transmission belt wheel below the front side of the rack through a first belt, and the first transmission belt wheel and the second transmission belt wheel are wrapped in an S shape; the first transmission belt wheel is coaxially connected with a reverse belt wheel, and the reverse belt wheel is connected with a first groove of a reversing belt wheel set below the rear side of the rack through a second belt. The second transmission belt wheel is coaxially connected with a forward rotation belt wheel, and the forward rotation belt wheel is connected with a second groove of the reversing belt wheel set through a third belt. A third groove of the reversing belt wheel set is in transmission connection with the upper end of a brush wheel through a fourth belt, and a brush head is installed on the circumference of the lower portion of the brush wheel. The sweeper can effectively clean dirt on the ground and weeds and moss on the brick ground, and the labor intensity of workers is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a sanitation equipment, and more particularly to a hand-held mobile ground sweeper, which is used in the field of ground sweeping equipment technology. Background Technology

[0002] China's road sweeper industry is gradually transforming from traditional mechanical models to intelligent and environmentally friendly products. Abroad, specialized products focus more on industrial and municipal sectors such as airport and highway cleaning, while domestically they are mainly used in urban roads and commercial settings, with household penetration remaining low at approximately 20%. China's urbanization rate is projected to reach 70% by 2030. With this increasing urbanization rate and the demand for smart city construction, the road sweeper industry is at a critical juncture of technological iteration and market expansion.

[0003] Although new energy and intelligent applications have become new tracks, existing technological developments still limit their application to some extent. Meanwhile, road sweeping equipment based on traditional technology routes continues to occupy the existing market through further segmentation of application scenarios and technological innovation.

[0004] Currently, the cleaning of accumulated dirt and grime on roads and public areas in China, as well as the removal of weeds and moss from cracks in masonry pavements, is mostly done manually. High-pressure water guns can be used in better conditions, but this increases water consumption, resulting in high costs and low efficiency. Existing small outdoor floor cleaning machines and scrubbers suffer from several shortcomings, including crude design, unstable performance, safety hazards, and limited applicability. Professional, hand-held, mobile floor cleaning scrubbers powered by gasoline engines offer specialized advantages in cleaning weeds and moss from cracks in masonry pavements, as well as removing organic waste and other deposits that adhere to regular surfaces. They can meet the specific needs of municipal sanitation, landscaping, and large-scale livestock farming for thorough floor cleaning. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] In order to overcome the shortcomings of the existing technology, this utility model proposes a hand-held mobile ground sweeper, which can effectively clean up dirt and weeds and moss on brick-paved ground, realize commercial application, and greatly reduce the labor intensity of workers.

[0008] To solve the above technical problems, this utility model provides a hand-held mobile floor sweeper, including a frame, an engine mounted on the top of the frame, wheels mounted on both sides of the bottom rear end of the frame, and control handles connected to both sides of the rear end of the frame. An engine pulley is located at the lower end of the engine's output shaft. The engine pulley is sequentially connected to a first tension pulley, a first transmission pulley, and a second transmission pulley on the lower front side of the frame via a first belt. The first and second transmission pulleys are S-shaped and wrapped around each other. A reverse pulley is coaxially connected to the first transmission pulley, and the reverse pulley is connected to a groove in a reversing pulley assembly on the lower rear side of the frame via a second belt. A forward pulley is coaxially connected to the second transmission pulley, and the forward pulley is connected to a groove in a reversing pulley assembly via a third belt. A groove in the reversing pulley assembly is connected to the upper end of a brush wheel via a fourth belt. A brush head is mounted on the lower circumference of the brush wheel.

[0009] As an improvement of this utility model, the middle part of the reversing long swing arm is hinged to the bottom front side of the frame through a swing shaft. The axles of the first transmission pulley and the second transmission pulley are respectively fixed on the reversing long swing arm and located on both sides of the swing shaft. The driving end of the reversing long swing arm extends outward and is controlled by the forward and reverse reversing mechanism.

[0010] As a further improvement of this utility model, the forward and reverse reversing mechanism includes a reversing handle, a positioner, a clamping plate, a vertical spindle, a short reversing arm, and a reversing connecting rod. The lower end of the reversing handle is connected to the positioner, which is located between two clamping plates. The front ends of the two clamping plates hold the vertical spindle, and the lower end of the vertical spindle is hinged to the rear end of the upper plane of the frame. One end of the short reversing arm is fixed to the vertical spindle, and the other end of the short reversing arm is hinged to the rear end of the reversing connecting rod. The front end of the reversing connecting rod is hinged to the driving end of the long reversing arm.

[0011] As a further improvement of this utility model, the lower front part of the positioner is hinged between two clamping plates by a horizontal positioner pin. The bottom rear side of the positioner is provided with a downwardly extending ratchet frame with an indexing plate fixed in the middle of the rear end. The rear end of the indexing plate is provided with a convex arc surface coaxial with the vertical spindle. The middle of the convex arc surface is provided with a neutral tooth groove. The left and right sides of the neutral tooth groove are respectively provided with ratchet teeth. The ratchet teeth and the neutral tooth groove are matched with the ratchet of the positioner.

[0012] As a further improvement of this utility model, the upper front end of the positioner is provided with a positioner protrusion, and an adjusting screw extending downward is screwed into the screw hole of the positioner protrusion. The lower end of the adjusting screw is sleeved with a compression spring upper seat, and a compression spring lower seat is connected between the lower parts of the two clamping plates. A compression spring is provided between the compression spring upper seat and the compression spring lower seat.

[0013] As a further improvement of this utility model, belt limiters are respectively provided within the belt wrap angle range on the outer side of the circumference of the forward rotating pulley, reverse rotating pulley and reversing pulley group to prevent the belt from slipping out of the groove when it loosens.

[0014] As a further improvement of this utility model, the axle of the first tensioning wheel is fixed to the free end of the first tensioning arm, the root of the first tensioning arm is hinged to the axle of the first transmission pulley and the reverse pulley, and a first tensioning spring is connected between the first tensioning arm and the frame to keep the first tensioning wheel in an outward tensioned state.

[0015] As a further improvement of this utility model, the upper end of the control armrest is provided with a throttle handle and a release stop handle, and the lower end of the control armrest connected to the frame is provided with a quick-release locking handle.

[0016] As a further improvement of this utility model, the wheel axles are respectively fixed to the outer wall of the wheel axle swing arm, and the middle part of the wheel axle swing arm is respectively hinged to the two side panels of the rear end of the frame through a horizontal spindle. The two wheel axle swing arms are connected by a transverse connecting rod. A pin is inserted into the upper end of the wheel axle swing arm. The side panel of the rear end of the frame is provided with multiple indexing holes, and each indexing hole is distributed on the circumference centered on the axis of the horizontal spindle. The pin is inserted into the corresponding indexing hole to adjust the height of the wheel. The upper end of the wheel axle swing arm is also connected to the frame through a wheel axle swing arm tension spring.

[0017] As a further improvement of this utility model, the center of the brush wheel is sleeved on the vertical shaft sleeve below the frame. The vertical shaft sleeve accommodates a height adjustment screw, and the lower end of the height adjustment screw is connected to a caster. The caster and the two rear wheels are supported on the ground.

[0018] Compared with existing technologies, this hand-held mobile floor sweeper has significant technical advantages and practical value, specifically reflected in the following aspects:

[0019] 1. Gasoline-powered hand-held mobile ground sweepers have professional advantages in cleaning weeds and moss growing in the gaps of brick and stone paved roads, as well as organic waste and other deposits that adhere to the ground. They can meet the special needs of municipal sanitation, landscaping and other scenarios for thorough ground cleaning.

[0020] 2. After the successful development of this machine, it avoids the pollution expansion and water consumption of high-pressure washing for cleaning hard, grime-covered floors, making it more environmentally friendly; and for cleaning weeds in the gaps of brick and stone paved roads, the working efficiency of one machine is 8-10 times that of traditional manual operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0022] Figure 1 This utility model provides a three-dimensional hand-held mobile floor sweeper. Figure 1 ;

[0023] Figure 2 This utility model provides a three-dimensional hand-held mobile floor sweeper. Figure 2 ;

[0024] Figure 3 This is a bottom view of the hand-held mobile floor sweeper of this utility model;

[0025] Figure 4 This is an exploded view of the hand-held mobile floor sweeper of this utility model;

[0026] Figure 5 This is a front view of the forward and reverse reversing mechanism in this utility model;

[0027] Figure 6 for Figure 5 Top view;

[0028] Figure 7 for Figure 5 A three-dimensional image;

[0029] Figure 8 for Figure 5 A partial sectional view;

[0030] In the diagram: 1. Frame; 1a. Indexing hole; 2. Engine; 2a. Engine pulley; 3. First belt; 4. First tension pulley; 5. First tension arm; 6. First tension spring; 7. First drive pulley; 8. Reverse pulley; 9. Second belt; 10. Belt limiter; 11. Second drive pulley;

[0031] 12. Forward-rotating pulley; 13. Third belt; 14. Reversing pulley assembly; 15. Fourth belt; 16. Brush wheel; 17. Brush head; 18. Belt limiter;

[0032] 19. Reversing handle; 20. Positioner; 20a. Pawl; 20b. Positioner front protrusion; 21. Clamping plate; 22. Pad; 23. Positioner pin; 24. Adjusting screw; 25. Compression spring; 25a. Upper compression spring seat; 25b. Lower compression spring seat; 26. Vertical spindle; 27. Reversing short swing arm; 28. Reversing linkage; 28a. Length adjusting screw;

[0033] 29. Reversing long swing arm; 30. Swing shaft; 31. Indexing plate; 31a. Racket tooth; 31b. Neutral gear groove;

[0034] 32. Reversing tension arm; 33. Reversing tension spring; 34. Reversing tension wheel; 35. Wheel and axle swing arm; 36. Horizontal spindle; 37. Wheel and axle swing arm tension spring; 38. Pin; 39. Lateral connecting rod; 40. Wheel and axle; 41. Wheel; 42. Height adjustment screw; 43. Caster; 44. Operating handle; 45. Throttle handle; 46. Release stop handle; 47. Quick-release locking handle. Detailed Implementation

[0035] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0036] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0038] like Figures 1 to 8 As shown, the hand-held mobile floor sweeper of this utility model includes a frame 1. An engine 2 is installed in the middle of the top surface of the frame 1, and wheels 41 are symmetrically installed on both sides of the bottom rear end of the frame 1. Control handles 44 extending rearward and upward are connected to both sides of the rear end of the frame 1. The upper end of the control handle 44 is provided with a throttle handle 45 and a release stop handle 46, and the lower end of the control handle 44, where it connects to the frame 1, is provided with a quick-release locking handle 47. A brush wheel 16 driven by the engine 2 is installed at the lower front end of the frame 1, and a brush head 17 facing the ground is installed on the lower circumference of the brush wheel 16.

[0039] The bottom of the frame 1 is equipped with a transmission mechanism, which includes an engine pulley 2a, a first tension pulley 4, a first transmission pulley 7, a second transmission pulley 11, and a reversing pulley group 14. The engine pulley 2a is fixed to the lower end of the output shaft of the engine 2. The first tension pulley 4, the first transmission pulley 7, and the second transmission pulley 11 are located side by side below the front end of the frame 1, with the first transmission pulley 7 located between the first tension pulley 4 and the second transmission pulley 11. The reversing pulley group 14 is located below the rear end of the frame 1.

[0040] The engine pulley 2a is connected to the first tension pulley 4, the first transmission pulley 7 and the second transmission pulley 11 in sequence via the first belt 3, wherein the first transmission pulley 7 and the second transmission pulley 11 are wrapped in an S-shape.

[0041] A reverse pulley 8 is coaxially connected to the first drive pulley 7. The reverse pulley 8 is connected to the first slot of the reversing pulley group 14 via the second belt 9. A forward pulley 12 is coaxially connected to the second drive pulley 11. The forward pulley 12 is connected to the second slot of the reversing pulley group 14 via the third belt 13. The third slot of the reversing pulley group 14 is connected to the upper end of the brush wheel 16 via the fourth belt 15.

[0042] A belt limiter 10 is provided within the belt wrap angle range outside the circumference of the reverse pulley 8, a belt limiter 18 is provided within the belt wrap angle range outside the circumference of the forward pulley 12, and a belt limiter is also provided within the belt wrap angle range outside the circumference of the reversing pulley group 14, to prevent the belt from slipping out of the groove when it loosens.

[0043] A forward and reverse reversing mechanism is installed on the frame. The forward and reverse reversing mechanism includes a reversing handle 19 connected to the middle of the rear end of the frame 1 and extending backward and upward. The lower end of the reversing handle 19 is connected to a positioner 20, and the two can be integrated into one unit. The positioner 20 is clamped between two parallel clamping plates 21. The lower front part of the positioner 20 is hinged between the two clamping plates 21 through a positioner pin 23, so that the reversing handle 19 can swing up and down around the positioner pin 23.

[0044] The upper front part of the positioner 20 is provided with a positioner front protrusion 20b. An adjusting screw 24 extending downward is screwed into the screw hole of the positioner front protrusion 20b. The lower end of the adjusting screw 24 is sleeved with a compression spring upper seat 25a. A compression spring lower seat 25b is connected between the lower parts of the two clamping plates 21. A compression spring 25 is provided between the compression spring upper seat 25a and the compression spring lower seat 25b.

[0045] A pad 22 is provided between the rear ends of the two clamping plates 21 and is fixedly connected to each other. The upper end of the vertical spindle 26 is fixedly connected between the front ends of the two clamping plates 21. The lower part of the vertical spindle 26 is connected to a short reversing swing arm 27 and the lower end is hinged to the frame 1. The other end of the short reversing swing arm 27 is hinged to a reversing connecting rod 28. The front end of the reversing connecting rod 28 is hinged to one end of a long reversing swing arm 29. The middle part of the long reversing swing arm 29 is hinged to the frame 1 through a swing shaft 30. An adjusting screw 28a is provided on the reversing connecting rod 28 to adjust the length of the reversing connecting rod 28.

[0046] A pawl 20a is provided on the lower rear side of the positioner 20. The lower end of the pawl 20a is embedded in the arc-shaped groove in the middle of the rear end of the frame 1. An indexing plate 31 is fixed in the middle of the rear end of the frame 1. The rear end of the indexing plate 31 has a convex arc surface. The convex arc surface of the indexing plate 31 and the arc-shaped groove on the frame 1 are both coaxial with the vertical spindle 26. A neutral tooth groove 31b is provided in the middle of the convex arc surface. A ratchet 31a is provided on the left and right sides of the neutral tooth groove 31b, and the ratchet 31a cooperates with the pawl 20a.

[0047] The tension of the compression spring 25 keeps the reversing handle 19 pressed down, which makes it easy for the pawl 20a of the positioner 20 to maintain a reliable engagement with the ratchet 31a on one side of the indexing plate 31.

[0048] When reversing is required, overcome the tension of the compression spring 25, lift the rear end of the reversing handle 19, so that the pawl 20a of the positioner 20 disengages from the ratchet 31a on one side of the indexing plate 31, until the reversing handle 19 rotates a certain angle around the axis of the vertical spindle 26 and engages with the ratchet 31a on the other side of the indexing plate 31, and then release the reversing handle 19.

[0049] The axles of the first transmission pulley 7 and the second transmission pulley 11 are located on both sides of the swing shaft 30, that is, the reversing long swing arm 29 connects the first transmission pulley 7 and the reverse pulley 8 assembly, and the second transmission pulley 11 and the forward pulley 12 assembly on both sides of the swing shaft 30.

[0050] The axle of the first tensioning pulley 4 is fixed to the free end of the first tensioning arm 5. The root of the first tensioning arm 5 is hinged to the axles of the first drive pulley 7 and the reverse pulley 8, allowing the first tensioning pulley 4 to rotate around the axis of the axles of the adjacent first drive pulley 7 and the reverse pulley 8. A first tensioning spring 6 connects the first tensioning arm 5 to the frame 1 to keep the first tensioning pulley 4 in an outward tensioned state.

[0051] Forward and reverse reversal process: The reversing handle 19 swings to the right, so that the pawl 20a of the positioner 20 engages with the ratchet 31a on the right side of the indexing plate 31. The free end of the reversing short swing arm 27 pulls the connecting rod 28 forward. The rear end of the connecting rod 28 pulls the right side of the reversing long swing arm 29 to swing forward around the swing axis 30. At this time, the reverse pulley 8 moves forward and the second belt 9 is relaxed; the forward pulley 12 moves backward and the third belt 13 is tensioned. The reversing pulley group 14 drives the brush wheel 16 to rotate forward through the fourth belt 15.

[0052] When the reversing handle 19 swings to the left, the pawl 20a of the positioner 20 engages with the ratchet 31a on the left side of the indexing plate 31. The free end of the reversing short swing arm 27 pushes the connecting rod 28 backward. The rear end of the connecting rod 28 pushes the right side of the reversing long swing arm 29 to swing backward around the swing axis 30. At this time, the reverse pulley 8 moves backward and the second belt 9 is tensioned; the forward pulley 12 moves forward and the third belt 13 is relaxed. The reversing pulley group 14 drives the brush wheel 16 to reverse through the fourth belt 15, thus realizing the reversing of the brush wheel 16.

[0053] When the reversing handle 19 is in the middle, the pawl 20a of the positioner 20 is engaged in the empty tooth groove 31b in the middle of the indexing plate 31. At this time, the second belt 9 and the third belt 13 are both in a slack state, and the brush wheel 16 does not rotate.

[0054] Reversing tension: The lower end of the axle of the reversing pulley group 14 is hinged with reversing tension arms 32 extending to both sides. The outer ends of the two reversing tension arms 32 are respectively equipped with reversing tension wheels 34, and the outer ends of the two reversing tension arms 32 are connected by reversing tension springs 33. Alternatively, the outer ends of the two reversing tension arms 32 can be tensioned by their respective reversing tension springs 33. The two reversing tension wheels 34 press on the outer side of the fourth belt 15 to increase the wrap angle of the fourth belt 15 on the reversing tension wheels 34.

[0055] Wheel height adjustment: The two ends of the transverse connecting rod 39 are fixed to the lower ends of the wheel axle swing arms 35. The middle parts of the wheel axle swing arms 35 are hinged to the side plates at the rear end of the frame 1 via horizontal spindles 36. The upper parts of the wheel axle swing arms 35 are connected to horizontally outward-extending wheel axles 40, and wheels 41 are installed on the wheel axles 40. A pin 38 is inserted into the upper end of each wheel axle swing arm 35. A spring is provided inside the pin 38 to ensure that the head of the pin 38 protrudes. Multiple indexing holes 1a are provided on the two side walls at the rear end of the frame 1. Each indexing hole 1a is distributed on the circumference centered on the axis of the horizontal spindle 36. The pin 38 is inserted into the corresponding indexing hole 1a to determine the height position of the wheel 41. The upper end of the wheel axle swing arm 35 is also connected to the frame 1 via a wheel axle swing arm tension spring 37, which is used to automatically lower the wheel 41 when the pin 38 is pulled out.

[0056] The brush wheel 16 has multiple hooks along its lower circumference for connecting the brush head 17. The brush wheel 16 has a belt groove along its upper circumference for the fourth belt 15 to be inserted. The brush wheel 16 is centrally fitted onto a vertical bushing below the frame 1. The vertical bushing houses a height adjustment screw 42, the lower end of which is connected to a caster 43. The caster 43, along with two rear wheels 41, is supported on the ground. Rotating the height adjustment screw 42 raises and lowers the caster 43 to adjust its height.

[0057] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A hand-held mobile floor sweeper, comprising a frame (1), an engine (2) mounted on the top of the frame (1), wheels (41) mounted on both sides of the bottom rear end of the frame (1), and operating handles (44) connected to both sides of the rear end of the frame (1), characterized in that: The lower end of the output shaft of the engine (2) is provided with an engine pulley (2a). The engine pulley (2a) is connected to the first tension pulley (4), the first transmission pulley (7) and the second transmission pulley (11) on the lower side of the front of the frame in sequence through the first belt (3). The first transmission pulley (7) and the second transmission pulley (11) are wrapped in an S-shape. A reverse pulley (8) is coaxially connected to the first transmission pulley (7). The reverse pulley (8) is connected to the first groove of the reversing pulley group (14) below the rear side of the frame via the second belt (9). A forward pulley (12) is coaxially connected to the second transmission pulley (11). The forward pulley (12) is connected to the second groove of the reversing pulley group (14) via the third belt (13). The third groove of the reversing pulley group (14) is connected to the upper end of the brush wheel (16) via the fourth belt (15). A brush head (17) is installed on the lower circumference of the brush wheel (16).

2. The walk-behind portable ground cleaning machine of claim 1, wherein: The middle part of the reversing long swing arm (29) is hinged to the bottom front side of the frame (1) via the swing shaft (30). The axles of the first transmission pulley (7) and the second transmission pulley (11) are respectively fixed on the reversing long swing arm (29) and located on both sides of the swing shaft (30). The driving end of the reversing long swing arm (29) extends outward and is controlled by the forward and reverse reversing mechanism.

3. The walk-behind portable ground cleaning machine of claim 2, wherein: The forward and reverse reversing mechanism includes a reversing handle (19), a positioner (20), a clamping plate (21), a vertical spindle (26), a short reversing arm (27), and a reversing link (28). The lower end of the reversing handle (19) is connected to the positioner (20). The positioner (20) is located between two clamping plates (21). The front ends of the two clamping plates (21) hold the vertical spindle (26). The lower end of the vertical spindle (26) is hinged to the rear end of the upper plane of the frame (1). One end of the short reversing arm (27) is fixed to the vertical spindle (26). The other end of the short reversing arm (27) is hinged to the rear end of the reversing link (28). The front end of the reversing link (28) is hinged to the driving end of the long reversing arm (29).

4. The walk-behind portable ground cleaning machine of claim 3, wherein: The lower front part of the locator (20) is hinged between two clamping plates (21) by a horizontal locator pin (23), and the bottom rear side of the locator (20) is provided with a downwardly extending pawl (20a). A dividing plate (31) is fixed at the middle of the rear end of the frame (1). The rear end of the dividing plate (31) is provided with a convex arc surface coaxial with the vertical spindle (26). A neutral tooth groove (31b) is provided in the middle of the convex arc surface. Ratchets (31a) are provided on the left and right sides of the neutral tooth groove (31b). The ratchet and the neutral tooth groove are matched with the pawl (20a) of the positioner (20).

5. The walk-behind portable ground cleaning machine of claim 3, wherein: The positioner (20) has a positioner front protrusion (20b) at the upper front end. An adjusting screw (24) extending downward is screwed into the screw hole of the positioner front protrusion (20b). A compression spring upper seat (25a) is sleeved at the lower end of the adjusting screw (24). A compression spring lower seat (25b) is connected between the lower parts of the two clamping plates (21). A compression spring (25) is provided between the compression spring upper seat (25a) and the compression spring lower seat (25b).

6. The walk-behind portable ground cleaning machine of claim 1, wherein: The belt limiters are provided within the belt wrap angle range on the outer side of the circumference of the forward rotating pulley (12), the reverse rotating pulley (8), and the reversing pulley group (14) to prevent the belt from slipping out of the groove when it loosens.

7. The walk-behind portable ground cleaning machine of claim 1, wherein: The axle of the first tensioning wheel (4) is fixed to the free end of the first tensioning arm (5). The root of the first tensioning arm (5) is hinged to the axle of the first transmission pulley (7) and the reverse pulley (8). A first tensioning spring (6) is connected between the first tensioning arm (5) and the frame (1) to keep the first tensioning wheel (4) in an outward tensioned state.

8. The walk-behind portable ground cleaning machine of claim 1, wherein: The upper end of the control armrest (44) is provided with a throttle handle (45) and a release stop handle (46), and the lower end of the control armrest (44) is provided with a quick-release locking handle (47) at the part connected to the frame (1).

9. The walk-behind portable ground cleaning machine of claim 1, wherein: The axles (40) of the wheels (41) are fixed to the outer wall of the axle swing arms (35). The middle part of the axle swing arms (35) is hinged to the two side panels at the rear end of the frame (1) through the horizontal spindle (36). The two axle swing arms (35) are connected by the transverse connecting rod (39). A pin (38) is inserted into the upper end of the axle swing arm (35). The side panel at the rear end of the frame (1) is provided with multiple indexing holes (1a). Each indexing hole (1a) is distributed on the circumference centered on the axis of the horizontal spindle (36). The pin (38) is inserted into the corresponding indexing hole (1a) to adjust the height of the wheels (41). The upper end of the axle swing arm (35) is also connected to the frame (1) through the axle swing arm tension spring (37).

10. The walk-behind portable ground cleaning machine according to any one of claims 1 to 9, characterized in that: The center of the brush wheel (16) is sleeved on the vertical shaft sleeve below the frame (1). The vertical shaft sleeve contains the height adjustment screw (42). The lower end of the height adjustment screw (42) is connected to a caster (43). The caster (43) and the two rear wheels (41) are supported on the ground.

Images