Crawler-type small dust removal vehicle for urban square

Abstract

The invention provides a crawler type urban square small dust removal vehicle which comprises side plates, a front bottom roller, a sliding rail, a sliding block, a machine head, a buffer roller, a water tank splash-proof front plate, a fixed pressing roller, a front upper roller, a pressing rod, a movable pressing roller, a cleaning roller, a rear upper roller, a splash-proof rear plate, a supporting rod, a rear bottom roller, a crawler, a bottom box, a bottom drawer, a connecting rod spring hook, a conveying wheel, a positioning block and a scraper. The front bottom roller and the rear bottom roller are landing rollers playing a role in bearing, the two rotating shafts are bearing shafts, the buffer roller, the front upper roller, the cleaning roller and the rear upper roller are guide roller sets playing a role in guiding, the four rotating shafts are guide shafts, the fixed pressing roller and the movable pressing roller are water squeezing rollers playing a role in water squeezing, the two rotating shafts are water squeezing shafts, and the diameters and the lengths of all the rollers are equal. The dust removal vehicle is extremely low in noise under the driving of a manpower or electric wheel type vehicle, does not adopt a complicated sewage recovery pump, adopts a plush crawler belt for dust adsorption and sewage suction, is not very complicated in overall structure, and is relatively light in overall weight.

Description

Technical Field

[0001] The present invention relates to a floor-sweeping vehicle, and particularly to a small dust removal vehicle with a tread width type for urban squares, belonging to the field of environmental sanitation technology. Background Art

[0002] In order to maintain the appearance of the city, reduce the flying of dust, and ensure the physical health of people, the roads and squares in the city need to be cleaned manually or by a sweeping vehicle every day. For the main roads in the city, large sweeping vehicles with functions such as integrated suction and sweeping, high-pressure flushing, and garbage compression are usually equipped. For medium-sized areas such as communities, factories, and parks, medium-sized floor-sweeping vehicles are usually equipped. For sidewalks, narrow streets or squares, small floor-sweeping vehicles are equipped. Among the above-mentioned floor-sweeping vehicles, some only sweep through rotating brushes and are suitable for dry environments; some combine brush sweeping and vacuum suction and can handle dust and small garbage; some have functions of high-pressure water spraying and sewage recycling and can handle adhesive stains. In addition, there are also multi-functional environmental sanitation vehicles that combine cleaning, watering, and garbage transfer.

[0003] The above technologies are already very mature and widely used. However, for some urban squares, due to the presence of steps, curbs, flower beds, stone balls or traffic restriction poles on the side, large sweeping vehicles and medium-sized floor-sweeping vehicles cannot enter. Some can enter, but heavy equipment may damage the ground of the square. Therefore, small floor-sweeping vehicles are generally used for cleaning urban squares. The current small floor-sweeping vehicles have functions such as rotating brushes, high-pressure flushing, and sewage recycling, with many functions and good effects, and have been widely used. However, since rotating brushes, high-pressure flushing, and sewage recycling require a large amount of power, all existing such floor-sweeping vehicles use internal combustion engines as power, and use high-pressure flushing pumps and sewage recycling pumps. The overall structure is relatively complex, the weight is relatively large, the cost is relatively high, and the noise is relatively large. Summary of the Invention

[0004] The purpose of the present invention is to provide a small dust removal vehicle with a tread width type for urban squares that has extremely low noise, a not very complex overall structure, and has the ability of dust suction and sewage recycling.

[0005] The technical problems to be solved by the present invention are realized through the following technical solutions: The dust removal vehicle includes side plates 1, front bottom rollers 2, slide rails 3, sliders 4, springs 5, a machine head 6, buffer rollers 7, a water tank 8, a funnel 9, a splash-proof front plate 10, a water squeezing shaft 11, a constant pressure roller 12, front upper rollers 13, guide shafts 14, pressure rods 15, dynamic pressure rollers 16, cleaning rollers 17, a rotary part 18, rear upper rollers 19, a support rod 20, a support handle 21, side guards 22, a splash-proof rear plate 23, a strut 24, rear bottom rollers 25, a load-bearing shaft 26, a tread width 27, a bottom box 28, a screen 29, a bottom drawer 30, a handle 31, a water discharge valve 32, a connecting rod 33, a connecting rod spring hook 34, a transport wheel shaft 35, transport wheels 36, a tension spring 37, a positioning block 38, a side plate spring hook 39, and a scraping guard 40.

[0006] The machine head 6 and the buffer roller 7 are at the front of the dust removal vehicle. The handle 21 and the side baffle 22 are at the rear of the dust removal vehicle. The front bottom roller 2 and the rear bottom roller 25 are the grounding rollers for bearing the weight. Both rotating shafts are load-bearing shafts 26. The buffer roller 7, the front upper roller 13, the cleaning roller 17 and the rear upper roller 19 are a set of guide rollers for guiding. All four rotating shafts are guide shafts 14. The fixed pressure roller 12 and the moving pressure roller 16 are water squeezing rollers for squeezing water. Both rotating shafts are water squeezing shafts 11. The diameters and lengths of all the rollers are equal.

[0007] The side plates 1, the support rods 20, the side baffles 22 and the struts 24 on both sides of the dust removal vehicle are combined into a frame through two load-bearing shafts 26, four guide shafts 14, the water squeezing shafts 11 of the fixed pressure roller 12 and the handle 21. All the rollers are clamped between the two side plates 1, and the length of the rollers is slightly less than the inner distance between the two side plates. All the shafts are slightly longer than the rollers. The two ends of the shafts pass through the side plates 1 on both sides and are connected to the outer walls of the side plates. The water tank 8, the funnel 9, the splash-proof front plate 10 and the splash-proof rear plate 23 form an integral whole as the water washing mechanism, and both sides of it are respectively connected to the inner walls of the two side plates 1.

[0008] At the front part of the bottom side of the frame mechanism, there is a front bottom roller 2, and at the rear part, there is a rear bottom roller 25. At the front part of the top side of the frame mechanism, there is a front upper roller 13, and at the rear part, there is a rear upper roller 19. Below the front upper roller 13 diagonally, there is a fixed pressure roller 12. Above the fixed pressure roller 12 diagonally, there is a pressure rod 15 with spring return. One end of the pressure rod 15 is movably connected to the guide shaft 14 of the front upper roller 13. At the other end of the pressure rod 15, there is a moving pressure roller 16. The moving pressure roller 16 is slightly lower than the fixed pressure roller 12 so as to be arranged staggeredly. Inside the cavity of the water washing mechanism, there is a cleaning roller 17.

[0009] At the front part of the frame and near the machine head 6, there is a long slide rail 3. Inside the slide rail 3, there is a long slider 4. One end of the slider 4 is connected to the machine head 6. On the machine head 6, there is a buffer roller 7. The buffer roller 7 and the machine head 6 can slide on the slide rail 3 along with the slider 4. On the slider 4, there is a spring 5. The slide rail 3, the slider 4, the spring 5 and the machine head 6 form a buffer mechanism. When the buffer roller 7 hits an obstacle, the buffer roller 7, the machine head 6 and the slider 4 can retract towards the rear part of the dust removal vehicle. After leaving the obstacle, the buffer roller 7, the machine head 6 and the slider 4 can return to their original positions under the action of the spring 5.

[0010] At the bottom of the water tank 8, there is a bottom box 28. The top of the bottom box 28 is connected to the bottom of the water tank 8. Inside the bottom box 28, there is a slidable bottom drawer 30. Between the bottom drawer 30 and the bottom box 28, there is a rubber sealing ring to prevent water leakage and a locking mechanism to prevent the bottom drawer 30 from falling off. The locking mechanism and the rubber sealing ring are arranged in the bottom box 28. In the upper half of the bottom drawer 30, there is a sieve 29. The bottom box 28, the sieve 29, and the bottom drawer 30 form a sediment accumulation mechanism. Fine sediment is deposited in the bottom drawer 30 below the sieve 29, coarser debris such as small stones, broken glass, and small iron nails are blocked in the part of the bottom drawer 30 above the sieve 29, and floating debris such as cigarette butts, paper scraps, foam scraps, and leaves float on the water surface in the water tank 8. When the dust removal vehicle moves, the water in the water tank 8 keeps shaking. Under the action of the arc-shaped splash-proof front plate 10 and the splash-proof rear plate 23, the water in the water tank 8 will not splash out of the water tank.

[0011] The tread 27 is a wide, fluffy, single-piece cloth with strong dust suction ability. Its width is equal to the length of the roller. The tread 27 successively bypasses the front bottom roller 2, the buffer roller 7, the front upper roller 13, the constant pressure roller 12, the cleaning roller 17, the rear upper roller 19, and the rear bottom roller 25 to form a continuous tread. The fluffy side of the tread 27 faces outward. The part of the tread 27 between the front bottom roller 2 and the rear bottom roller 25 touches the ground for sucking dust on the ground. The part above the front upper roller 13, the constant pressure roller 12, the cleaning roller 17, and the rear upper roller 19 is the rotating part 18 of the tread. The bottom of the rotating part 18 is immersed in the water in the water tank 8 to wash off the dust sucked on the tread. The dynamic pressure roller 16 presses on the constant pressure roller 12 to form a water squeezing mechanism. The squeezed water falls back into the water tank 8 through the funnel 9. When the buffer roller 7 encounters an obstacle and retracts, the tread will be instantly loosened. Under the action of the staggered arrangement of the dynamic pressure roller 16 and the constant pressure roller 12, the tread is quickly tightened by the dynamic pressure roller 16. The dynamic pressure roller 16 not only squeezes water from the tread together with the constant pressure roller 12 but also plays a role in tightening the tread.

[0012] When the dust removal vehicle is operating, the tread rotates around the guiding roller group. The tread on the upper part of the dust removal vehicle continuously moves from the rear to the front, and the tread on the bottom of the dust removal vehicle continuously moves from the front to the rear, repeating in a cycle. Dust, accumulated water, or sewage on the ground is brought into the water tank 8 by the rotating tread. The shaking water body in the water tank 8 when the dust removal vehicle moves washes off the dust and sewage on the tread. The water squeezing mechanism squeezes out the accumulated water on the tread, and then the tread rotates back to the ground-touching part, and dust, rainwater accumulation, or accidental sewage on the ground are continuously sucked away by the dust removal vehicle.

[0013] Due to the adoption of the above technical solutions, the advantages and positive effects of the present invention are as follows: The dust removal vehicle has extremely low noise when driven by manpower or an electric wheeled vehicle. The dust removal vehicle does not use a complex sewage recovery pump. It uses a fluffy tread to adsorb dust and suck away sewage. The overall structure is not very complex, and the overall weight of the dust removal vehicle is relatively light. Description of the Drawings

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The present invention has the following four drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention, Figure 2 It is a schematic diagram of the frame, water tank, each roller and buffer mechanism of the present invention, Figure 3 It is a schematic diagram of the tread width and each roller of the present invention, Figure 4 It is a schematic diagram of the transfer mechanism of the present invention.

[0015] The numbers marked in the drawings respectively represent the following: 1. Side plate, 2. Front bottom roller, 3. Slide rail, 4. Slide block, 5. Spring, 6. Machine head, 7. Buffer roller, 8. Water tank, 9. Hopper, 10. Splash-proof front plate, 11. Water squeezing shaft, 12. Constant pressure roller, 13. Front upper roller, 14. Guide shaft, 1�. Pressure bar, 16. Moving pressure roller, 17. Cleaning roller, 18. Rotary part, 19. Rear upper roller, 20. Support rod, 21. Support handle, 22. Side baffle, 23. Splash-proof rear plate, 24. Strut, 25. Rear bottom roller, 26. Load-bearing shaft, 27. Tread width, 28. Bottom box, 29. Screen, 30. Bottom drawer, 31. Handle, 32. Water discharge valve, 33. Connecting rod, 34. Connecting rod spring hook, 35. Transport wheel shaft, 36. Transport wheel, 37. Pulling spring, 38. Positioning block, 39. Side plate spring hook, 40. Scraping baffle. Detailed implementation manners

[0016] 1. A small dust removal vehicle for a tread-width type urban square, comprising a side plate 1, a front bottom roller 2, a slide rail 3, a slide block 4, a spring 5, a machine head 6, a buffer roller 7, a water tank 8, a hopper 9, a splash-proof front plate 10, a water squeezing shaft 11, a constant pressure roller 12, a front upper roller 13, a guide shaft 14, a pressure bar 15, a moving pressure roller 16, a cleaning roller 17, a rotary part 18, a rear upper roller 19, a support rod 20, a support handle 21, a side baffle 22, a splash-proof rear plate 23, a strut 24, a rear bottom roller 25, a load-bearing shaft 26, a tread width 27, a bottom box 28, a screen 29, a bottom drawer 30, a handle 31, a water discharge valve 32, a connecting rod 33, a connecting rod spring hook 34, a transport wheel shaft 35, a transport wheel 36, a pulling spring 37, a positioning block 38, a side plate spring hook 39 and a scraping baffle 40.

[0017] 2. The machine head 6 and the buffer roller 7 are at the front of the dust removal vehicle, the support handle 21 and the side baffle 22 are at the rear of the dust removal vehicle, the front bottom roller 2 and the rear bottom roller 25 are the grounding rollers for bearing the load, and the two rotating shafts are both load-bearing shafts 26. The buffer roller 7, the front upper roller 13, the cleaning roller 17 and the rear upper roller 19 are a guide roller group for guiding, and the four rotating shafts are all guide shafts 14. The constant pressure roller 12 and the moving pressure roller 16 are water squeezing rollers for squeezing water, and the two rotating shafts are both water squeezing shafts 11. The diameters and lengths of each roller are equal.

[0018] 3. According toFigure 1 and Figure 2 On both sides in the front - rear direction of the dust removal vehicle, there are side plates 1, handrails 20, side guards 22 and support rods 24. The side plates 1, handrails 20, side guards 22 and support rods 24 on both sides are combined into a frame through two load - bearing shafts 26, four guiding shafts 14, the water - squeezing shaft 11 of the constant - pressure roller 12 and the handgrip 21. All the rollers are clamped between two side plates 1, and the length of the roller is slightly less than the inner distance between the two side plates. All the shafts are slightly longer than the rollers. The two ends of the shafts respectively pass through the two side plates 1 and are connected to the outer walls of the side plates. Bearings are provided between all the rollers and the shafts, and all the rollers can rotate on their respective shafts. The water tank 8, the funnel 9, the splash - proof front plate 10 and the splash - proof rear plate 23 form an integral whole as the water - washing mechanism, which is also clamped between two side plates 1 and is respectively connected to the inner walls of the two side plates 1 on both sides.

[0019] 4. At the front part of the bottom side of the frame mechanism, there is a front bottom roller 2, and at the rear part, there is a rear bottom roller 25. At the front part of the top side of the frame mechanism, there is a front upper roller 13, and at the rear part, there is a rear upper roller 19. Below the oblique - lower part of the front upper roller 13, there is a constant - pressure roller 12. Above the oblique - upper part of the constant - pressure roller 12, there is a pressure lever 15 with spring return. One end of the pressure lever 15 is movably connected to the guiding shaft 14 of the front upper roller 13, and at the other end of the pressure lever 15, there is a moving - pressure roller 16. The moving - pressure roller 16 is slightly lower than the constant - pressure roller 12 so as to be arranged in a staggered manner. Inside the cavity of the water - washing mechanism, there is a cleaning roller 17.

[0020] At the front part of the frame and near the machine head 6, there is a long slide rail 3. Inside the slide rail 3, there is a long slider 4. One end of the slider 4 is connected to the machine head 6. On the machine head 6, there is a buffer roller 7. The buffer roller 7 and the machine head 6 can slide on the slide rail 3 along with the slider 4. There is a spring 5 on the slider 4. The slide rail 3, the slider 4, the spring 5 and the machine head 6 form a buffer mechanism. When the buffer roller 7 hits an obstacle, the buffer roller 7, the machine head 6 and the slider 4 can retract towards the rear direction of the dust removal vehicle. After leaving the obstacle, the buffer roller 7, the machine head 6 and the slider 4 can return to their original positions under the action of the spring 5.

[0021] 5. At the bottom of the water tank 8, there is a bottom box 28. The top of the bottom box 28 is communicated with the bottom of the water tank 8. Inside the bottom box 28, there is a drawer 30 that can be inserted and pulled out. Between the drawer 30 and the bottom box 28, there is a rubber sealing ring for preventing water leakage and a locking device for preventing the drawer 30 from falling off. The locking device and the rubber sealing ring are arranged on the bottom box 28. In the upper half part of the drawer 30, there is a sieve 29. The bottom box 28, the sieve 29 and the drawer 30 form a sediment - accumulating mechanism. Fine sediment is deposited in the drawer 30 below the sieve 29, coarser sundries including small stones, broken glass and small iron nails are blocked in the part of the drawer 30 above the sieve 29, and floating sundries including cigarette butts, paper scraps, foam scraps and leaves float on the water surface in the water tank 8. When the dust removal vehicle is moving, the water in the water tank 8 keeps shaking. Under the action of the arc - shaped splash - proof front plate 10 and splash - proof rear plate 23, the water in the water tank 8 will not splash out of the water tank.

[0022] 6. The travel width 27 is a single wide, fluffy cloth with strong dust suction ability. Its width is equal to the length of the roller. According to Figure 3 , the travel width 27 successively bypasses the front bottom roller 2, the buffer roller 7, the front upper roller 13, the constant pressure roller 12, the cleaning roller 17, the rear upper roller 19, and the rear bottom roller 25 to form a continuous travel width. The fluffy side of the travel width 27 faces outward. The part of the travel width 27 between the front bottom roller 2 and the rear bottom roller 25 touches the ground for sucking dust on the ground. The part above the front upper roller 13, the constant pressure roller 12, the cleaning roller 17, and the rear upper roller 19 is the rotating part 18 of the travel width. The bottom of the rotating part 18 is immersed in the water in the water tank 8 to wash off the sucked dust on the travel width. The dynamic pressure roller 16 presses on the constant pressure roller 12 to form a water squeezing mechanism. The squeezed water falls back into the water tank 8 through the funnel 9. When the buffer roller 7 encounters an obstacle and retracts, the travel width will be instantaneously loosened. Under the action of the staggered arrangement of the dynamic pressure roller 16 and the constant pressure roller 12, the travel width is quickly tensioned by the dynamic pressure roller 16. On the one hand, the dynamic pressure roller 16 and the constant pressure roller 12 squeeze the water of the travel width together. On the other hand, the dynamic pressure roller 16 tensions the travel width.

[0023] 7. According to Figures 1-3 , when the dust removal vehicle operates, it is pushed forward by holding the handle 21 manually or by connecting the handle 21 to an electric wheeled vehicle. The travel width rotates around the guide roller set. The travel width at the upper part of the dust removal vehicle continuously moves from the rear to the front, and the travel width at the bottom of the dust removal vehicle continuously moves from the front to the rear, cycling continuously. The dust, accumulated water, or sewage on the ground is brought into the water tank 8 by the rotating travel width. The shaking water body during the movement of the dust removal vehicle washes off the dust and sewage on the travel width. The water squeezing mechanism squeezes out the accumulated water on the travel width, and then the travel width rotates to the ground-touching surface, and the dust, rainwater accumulation, or accidental sewage on the ground is continuously sucked off by the dust removal vehicle.

[0024] 8. Due to the strong frictional force between the fluffy travel width and the ground, it is very difficult for the dust removal vehicle to change or reverse its direction. Therefore, a transfer mechanism needs to be set up. According to Figure 4 , connecting rods 33 are arranged on both sides of the rear part of the dust removal vehicle. One end of the connecting rod 33 is provided with a scraping block 40. The part of the connecting rod 33 near the scraping block 40 is movably connected to the load-bearing shaft 26. The side plate 1 near the load-bearing shaft 26 is provided with a side plate spring hook 39 and a positioning block 38. Under the limitation of the scraping block 40 and the positioning block 38, the connecting rod 33 can only rotate around the load-bearing shaft 26 within a certain range. The other end of the connecting rod 33 is provided with a transport wheel shaft 35 and its transport wheel 36. The connecting rod 33 near the transport wheel shaft 35 is provided with a connecting rod spring hook 34. A tension spring 37 is arranged between the connecting rod spring hook 34 and the side plate spring hook 39.

[0025] 9. When the dust removal vehicle is operating, the connecting rod 33 is in a horizontal state and slightly tilted upwards, and the transport wheel 36 does not touch the ground. When the dust removal vehicle needs to change direction, turn around or be transported, step on the protruding part of the transport wheel shaft 35 with your foot and lift the rear part of the dust removal vehicle upwards forcefully, so that the connecting rod 33 stands up and is slightly tilted backwards, and the transport wheel 36 will then touch the ground. Under the action of the tension spring 37, the scraping block 40 and the positioning block 38, the connecting rod 33 and the transport wheel 36 maintain their postures, and its working principle and process are similar to those of the footrest of a bicycle.

[0026] 10. After the dust removal vehicle finishes operating, move it to the designated location, use a net bag to fish out the floating objects on the water surface in the water tank 8, drain the sewage in the water tank 8 through the drain valve 32, unlock it, and pull out the bottom drawer 30 through the handle 31. First, sweep the coarse particles on the sieve mesh 29, and then invert the bottom drawer 30 to pour out the sludge. Wash the water tank 8, the tread 27 and the bottom drawer 30 with clean water. After cleaning, insert the bottom drawer 30 back into the bottom box 28 for the next use of the dust removal vehicle. Before the next use, inject water into the water tank 8 through the opening on the top surface of the water tank and an additional hose. The height of the water surface in the water tank 8 is preferably 60 - 70% of the height of the water tank.

[0027] 11. This dust removal vehicle is mainly used for flat squares in the city. The term "flat" means that the ground is relatively flat, with fewer steps and no sharp turns. It has the best dust removal effect on squares paved with marble and tiles, followed by those paved with concrete and fine-grained asphalt, and slightly worse dust removal effect on asphalt squares with coarser particles and pebble ground.

[0028] 12. The width of the dust removal vehicle is 65 - 90 cm, and the length is 100 - 120 cm. If there are steps, curbs, flower beds, stone balls or traffic restriction poles on the side of the field and it cannot pass through, due to the relatively light overall weight of the dust removal vehicle, it can be carried over the obstacle and then filled with water, and it can be pushed by manpower. The material of the side plate 1 is galvanized steel plate with a thickness of 1.2 - 1.6 mm. To improve the mechanical strength, it can be pressed into a structure with concave and convex patterns or stripes. The materials of the water tank 8, the splash-proof front plate 10, the splash-proof rear plate 23, the bottom box 28 and the bottom drawer 30 are stainless steel with a thickness of 0.8 - 1.0 mm. The sieve mesh 29 is stainless steel with a mesh hole side length of 1 - 2 mm. The front bottom roller 2 and the rear bottom roller 25 are made of styrene-butadiene rubber or cowhide rubber with a diameter of about 8 cm, and the other rollers are made of plastic or nylon with a diameter of 4.2 - 4.8 cm. To reduce the weight of each roller, it can be made into a multi-grooved hollow roller with a cross-section similar to the spokes of a rice character, but the number of spokes ≥ 12 is required to ensure the mechanical strength of each roller. The length of the slide rail 3 is about 12 cm, and the handle 21 is embedded with a steel pipe, and the steel pipe is sheathed with a plastic pipe with an outer diameter of 3.6 - 4.2 cm.

Claims

1. A small dust removal vehicle for urban squares with a tread width, comprising side plates (1), front bottom rollers (2), slide rails (3), sliders (4), springs (5), a machine head (6), buffer rollers (7), a water tank (8), a funnel (9), a splash-proof front plate (10), a water squeezing shaft (11), a constant pressure roller (12), a front upper roller (13), a guiding shaft (14), a pressure bar (15), a moving pressure roller (16), a cleaning roller (17), a rotating part (18), a rear upper roller (19), a handrail (20), a handgrip (21), side guards (22), a splash-proof rear plate (23), a support bar (24), rear bottom rollers (25), a load-bearing shaft (26), a tread width (27), a bottom box (28), a sieve (29), a bottom drawer (30), a handle (31), a water discharge valve (32), a connecting rod (33), a connecting rod spring hook (34), a transport wheel shaft (35), transport wheels (36), a tension spring (37), a positioning block (38), side plate spring hooks (39), and a scraping guard (40); The front bottom rollers (2) and the rear bottom rollers (25) are grounding rollers for bearing weight, and the two rotating shafts are both load-bearing shafts (26). The buffer rollers (7), the front upper rollers (13), the cleaning rollers (17), and the rear upper rollers (19) form a guiding roller group for guiding, and the four rotating shafts are all guiding shafts (14). The constant pressure roller (12) and the moving pressure roller (16) are water squeezing rollers for squeezing water, and the two rotating shafts are both water squeezing shafts (11). The diameters and lengths of all the rollers are equal; It is characterized in that: The side plates (1), handrails (20), side guards (22), and support bars (24) on both sides of the dust removal vehicle are combined into a frame through two load-bearing shafts (26), four guiding shafts (14), the water squeezing shafts (11) of the constant pressure roller (12), and the handgrip (21). All the rollers are clamped between the two side plates (1), and the length of the rollers is slightly less than the inner distance between the two side plates. All the shafts are slightly longer than the rollers, and both ends of the shafts pass through the side plates (1) on both sides and are connected to the outer walls of the side plates. The water tank (8), the funnel (9), the splash-proof front plate (10), and the splash-proof rear plate (23) form a whole as a water washing mechanism, and both sides of it are respectively connected to the inner walls of the two side plates (1); At the front part of the bottom side of the frame mechanism, there are front bottom rollers (2), and at the rear part, there are rear bottom rollers (25). At the front part of the top side of the frame mechanism, there are front upper rollers (13), and at the rear part, there are rear upper rollers (19). Below the front upper rollers (13) obliquely, there are constant pressure rollers (12), and above the constant pressure rollers (12) obliquely, there are pressure bars (15) with spring return. One end of the pressure bar (15) is movably connected to the guiding shaft (14) of the front upper roller (13), and at the other end of the pressure bar (15), there are moving pressure rollers (16). The moving pressure rollers (16) are slightly lower than the constant pressure rollers (12) so as to be arranged in a staggered manner. Inside the cavity of the water washing mechanism, there are cleaning rollers (17); The footprint width (27) is a single wide, fluffy cloth with strong dust suction ability. Its width is equal to the length of the roller. The footprint width (27) successively bypasses the front bottom roller (2), the buffer roller (7), the front upper roller (13), the constant pressure roller (12), the cleaning roller (17), the rear upper roller (19) and the rear bottom roller (25) to form a continuous footprint width. The fluffy side of the footprint width (27) faces outward. The part of the footprint width (27) between the front bottom roller (2) and the rear bottom roller (25) touches the ground for sucking dust on the ground. The part above the front upper roller (13), the constant pressure roller (12), the cleaning roller (17) and the rear upper roller (19) is the rotating part (18) of the footprint width. The bottom of the rotating part (18) is immersed in the water in the water tank (8) to wash off the dust sucked on the footprint width. The dynamic pressure roller (16) presses on the constant pressure roller (12) to form a water squeezing mechanism. The squeezed water falls back into the water tank (8) through the funnel (9). When the buffer roller (7) encounters an obstacle and retracts, the footprint width will be instantly loosened. Under the action of the staggered arrangement of the dynamic pressure roller (16) and the constant pressure roller (12), the footprint width is quickly tightened by the dynamic pressure roller (16). The dynamic pressure roller (16) not only squeezes water from the footprint width together with the constant pressure roller (12), but also tightens the footprint width. When the dust removal vehicle is operating, the footprint width rotates around the guiding roller group. The footprint width on the upper part of the dust removal vehicle continuously moves from the rear to the front, and the footprint width on the bottom of the dust removal vehicle continuously moves from the front to the rear, repeating in a cycle. The dust on the ground is brought into the water tank (8) by the rotating footprint width. When the dust removal vehicle moves, the shaking water body washes off the dust on the footprint width. The water squeezing mechanism squeezes out the accumulated water on the footprint width, and then the footprint width turns to the ground-touching part, and the dust on the ground is continuously stuck off by the dust removal vehicle.

2. The small dust removal vehicle for urban squares with a walking amplitude type according to claim 1, characterized in that: At the front part of the frame and near the machine head (6), there is a long slide rail (3). Inside the slide rail (3), there is a long slider (4). One end of the slider (4) is connected to the machine head (6). There is a buffer roller (7) on the machine head (6). The buffer roller (7) and the machine head (6) can slide on the slide rail (3) along with the slider (4). There is a spring (5) on the slider (4). The slide rail (3), the slider (4), the spring (5) and the machine head (6) constitute a buffer collision mechanism. When the buffer roller (7) hits an obstacle, the buffer roller (7), the machine head (6) and the slider (4) can retract towards the rear of the dust removal vehicle. After leaving the obstacle, the buffer roller (7), the machine head (6) and the slider (4) can return to their original positions under the action of the spring (5).

3. The small dust removal vehicle for urban squares in a step width type according to claim 1, characterized in that: A bottom box (28) is provided at the bottom of the water tank (8). The top of the bottom box (28) is communicated with the bottom of the water tank (8). A detachable bottom drawer (30) is provided in the bottom box (28). A rubber sealing ring for preventing water leakage and a locking mechanism for preventing the bottom drawer (30) from falling off are provided between the bottom drawer (30) and the bottom box (28). The locking mechanism and the rubber sealing ring are provided in the bottom box (28). A sieve mesh (29) is provided in the upper half of the bottom drawer (30). The bottom box (28), the sieve mesh (29) and the bottom drawer (30) form a sediment accumulation mechanism. Fine sediment is deposited in the bottom drawer (30) below the sieve mesh (29). Coarser sundries including small stones, broken glass and small iron nails are blocked in the part of the bottom drawer (30) above the sieve mesh (29). Sundries with floating ability including cigarette butts, paper scraps, foam scraps and leaves float on the water surface in the water tank (8). When the dust removal vehicle moves, the water in the water tank (8) keeps shaking. Under the action of the arc-shaped splash-proof front plate (10) and the splash-proof rear plate (23), the water in the water tank (8) will not splash out of the water tank.

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