A road maintenance vehicle

Abstract

The embodiment of the utility model provides a kind of road maintenance vehicle, it is related to sanitation vehicle field.The road maintenance vehicle includes chassis, carriage and sewage driving element, carriage is installed in chassis, sewage tank and fresh water tank are provided in carriage, the outside of carriage is provided with rotary arm support and cleaning device;Cleaning device and sewage tank are communicated by sewage pipe, cleaning device and fresh water tank are communicated by cleaning water pipe, cleaning water pipe and sewage pipe are at least partially set on rotary arm support, cleaning water pipe and sewage pipe part are fixed by rotary arm support, the movable length and weight of cleaning water pipe and sewage pipe are reduced, when washing ground, it can be operated smoothly and save labor, meanwhile rotary arm support can also help to cross over obstacle;And by sewage driving element to form negative pressure in sewage tank, the sewage generated by cleaning device is pumped, replace the operation mode of using jet high pressure water siphon recovery sewage, can reduce the waste of water resources.

Description

Technical Field

[0001] This utility model relates to the field of sanitation vehicles, and more specifically, to a road maintenance vehicle. Background Technology

[0002] A road maintenance vehicle is a type of engineering vehicle used for road maintenance. It has the functions of cleaning and maintaining road surfaces. Since high-pressure water cleaning of the road surface will generate wastewater, it is necessary to recycle the wastewater to avoid secondary pollution caused by the wastewater flowing around.

[0003] Existing maintenance vehicles are equipped with an integrated water tank, high-pressure water pump, and wastewater recovery disc. The high-pressure water pump outputs high-pressure water into the wastewater recovery disc. One stream is used for cleaning high-pressure water to rinse dirty floors, while the other stream is used as a jet of high-pressure water. This jet nozzle creates a localized negative pressure, generating suction at the bottom of the wastewater recovery disc to collect the wastewater. However, this method of creating negative pressure requires a large amount of high-pressure water, resulting in significant water waste. Furthermore, the high-pressure water pipe and wastewater pipe connecting the water tank and the wastewater recovery disc in existing maintenance vehicles are quite long and not properly secured. During cleaning, a large portion of the pipe needs to be dragged, making the cleaning operation inconvenient and laborious. Utility Model Content

[0004] This utility model provides a road maintenance vehicle that can solve the problems of excessive water consumption and inconvenient cleaning operations of current maintenance vehicles.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a road maintenance vehicle, which includes: Chassis; The carriage is mounted on the chassis. Inside the carriage are a sewage tank and a clean water tank. Outside the carriage are a rotating boom and a cleaning device. The cleaning device is connected to the sewage tank via a sewage pipe, and the cleaning device is connected to the clean water tank via a cleaning water pipe. At least part of the cleaning water pipe and the sewage pipe are mounted on the rotating boom. The suction drive unit is used to create negative pressure inside the wastewater tank to suck up the wastewater generated by the cleaning device.

[0006] Optionally, the cleaning device is a wastewater recovery tray, which is equipped with a rotating spray bar and a suction pipe. The rotating spray bar is connected to the cleaning water pipe, and the suction pipe is connected to the wastewater pipe.

[0007] Optionally, a water pump is connected to the end of the cleaning water pipe, and the water pump inlet is connected to the clean water tank.

[0008] Optionally, the carriage is also equipped with a power compartment and a tool compartment, with the sewage suction drive unit located in the tool compartment and the water pump located in the power compartment; The clean water tank and the wastewater tank are arranged adjacent to each other, the power compartment is located on the side closer to the clean water tank, and the tool compartment is located on the side closer to the wastewater tank.

[0009] Optionally, the sewage pipe includes a fixed section and a movable section. The fixed section is mounted on a rotating boom, and the fixed section and the movable section are connected by a quick-release coupling.

[0010] Optionally, the wastewater tank is equipped with a self-cleaning mechanism for rinsing the inner wall of the wastewater tank. The self-cleaning mechanism is connected to a clean water tank or a cleaning water pipe.

[0011] Optionally, the self-cleaning mechanism includes a spray pipe and a nozzle, the spray pipe being fixed to the inner wall of the wastewater tank, the nozzle being installed on the spray pipe, and the spray pipe being connected to a clean water tank or a cleaning water pipe.

[0012] Optionally, a level gauge is installed inside the wastewater tank, with the level gauge positioned below the nozzle.

[0013] Optionally, the sewage tank is an independent tank located in the tool compartment. The independent tank is also equipped with a side door that is sealed to the tank body. A sewage collector is located below the side door.

[0014] Optionally, the top of the sewage tank is provided with a sewage recovery port and a suction port. The sewage recovery port is connected to the sewage pipe, and the suction port is connected to the suction end of the sewage suction drive. The bottom of the sewage tank is provided with a sewage discharge port. The height of the sewage discharge port is lower than the plane of the bottom wall of the sewage tank, and a sewage discharge switch valve is provided at the sewage discharge port.

[0015] The beneficial effects of this utility model embodiment: This road maintenance vehicle includes a chassis, a cargo box, and a suction drive unit. The cargo box is mounted on the chassis and contains a wastewater tank and a clean water tank. A rotating boom and a cleaning device are mounted on the exterior of the cargo box. The cleaning device is connected to the wastewater tank via a wastewater pipe, and to the clean water tank via a cleaning water pipe. At least part of the cleaning water and wastewater pipes are mounted on the rotating boom, which secures these pipes, reducing their movable length and weight. This allows for smoother and more labor-saving operation when cleaning the ground, and the rotating boom also helps overcome obstacles. The suction drive unit creates negative pressure in the wastewater tank to draw out the wastewater generated by the cleaning device, replacing the method of using high-pressure water jets to siphon and recover wastewater, thus reducing water waste. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the road maintenance vehicle provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram showing the cooperation between the sewage tank and the suction drive component provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the wastewater recovery tray provided in an embodiment of the present utility model; Figure 4 This diagram illustrates the positional relationship between the sewage tank and the carriage when the sewage tank is an independent tank in an embodiment of this utility model. Figure 5 This is a schematic diagram of the structure of the independent box provided in an embodiment of this utility model.

[0018] Icons: 1-Chassis; 2-Cargo compartment; 20-Sewage tank; 202-Sewage recovery port; 203-Suction port; 204-Discharge port; 2041-Discharge valve; 21-Clean water tank; 22-Rotating boom; 23-Power compartment; 231-Water pump; 24-Tool compartment; 25-Inspection port; 26-Independent box; 261-Box body; 262-Side door; 263-Sewage collector; 2631-Discharge ball valve; 3-Cleaning device; 30-Disc body; 31-Rotating spray bar; 32-Suction pipe; 33-Nozzle; 34-Guide pipe; 4-Sewage pipe; 40-Fixed section; 41-Moving section; 42-Quick-release connector; 5-Cleaning water pipe; 6-Suction drive component; 60-Air duct; 7-Self-cleaning mechanism; 70-Spray pipe; 71-Nozzle; 72-Bracket; 8-Level gauge. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] Please refer to Figure 1 and Figure 2This utility model provides a road maintenance vehicle, which includes a chassis 1, a cargo box 2, and a sewage suction drive 6. The cargo box 2 is mounted on the chassis 1. A sewage tank 20 and a clean water tank 21 are provided inside the cargo box 2. A rotating boom 22 and a cleaning device 3 are provided outside the cargo box 2. The cleaning device 3 is connected to the sewage tank 20 through a sewage pipe 4, and the cleaning device 3 is connected to the clean water tank 21 through a cleaning water pipe 5. The cleaning water pipe 5 and the sewage pipe 4 are at least partially provided on the rotating boom 22. The sewage suction drive 6 is used to create a negative pressure in the sewage tank 20 to suck up the sewage generated by the cleaning device 3.

[0028] The cleaning water pipe 5 and sewage pipe 4 of this road maintenance vehicle are at least partially mounted on the rotating boom 22. The rotating boom 22 fixes and supports the cleaning water pipe 5 and sewage pipe 4, reducing the movable length and weight of the cleaning water pipe 5 and sewage pipe 4. This allows for smoother operation and less effort when cleaning the ground. At the same time, the rotating boom 22 can also help overcome obstacles, thereby cleaning dead corner areas or entering narrow spaces. The suction drive 6 creates negative pressure in the sewage tank 20 to suck up the sewage generated by the cleaning device 3, replacing the existing operation method of using jet high-pressure water siphon to recover sewage. This can reduce water waste and improve the sewage recovery effect. Even if the ground cleaning stops, the cleaning sewage can continue to be recovered, solving the problem of sewage not being fully recovered.

[0029] Specifically, a carriage 2 is mounted on the chassis 1. Inside the carriage 2 are a clean water tank 21, a wastewater tank 20, a power compartment 23, and a tool compartment 24. The clean water tank 21 holds clean water, which can be used for cleaning the floor. The wastewater tank 20 stores wastewater sucked up by the cleaning device 3. The power compartment 23 stores power modules, such as batteries. The tool compartment 24 stores cleaning or repair tools, such as the cleaning device 3. The clean water tank 21, wastewater tank 20, power compartment 23, and tool compartment 24 can be directly partitioned using partitions to divide the interior space of the carriage 2, or they can be independent boxes or containers. In this embodiment, the wastewater tank 20 is an independent box 26, which is located inside the tool compartment 24 and detachably connected to it. This allows for flexible disassembly and replacement according to the needs of the usage scenario, and also facilitates repair or replacement in case of leakage or damage. Of course, one or more of the clean water tank 21, power compartment 23, and tool compartment 24 can also be independent boxes; this embodiment does not limit this.

[0030] One end of the cleaning water pipe 5 is connected to a water pump 231, and the inlet of the water pump 231 is connected to the clean water tank 21 via a pipe. The other end of the cleaning water pipe 5 is connected to the cleaning device 3. When the water pump 231 is working, it can pressurize and pump the clean water in the clean water tank 21 to the cleaning device 3, and then clean the floor through the cleaning device 3. The water pump 231 is a high-pressure pump, used to pressurize the clean water and pump it out to meet the needs of high-pressure washing of floor stains. The cleaning water pipe 5 is a high-pressure resistant rubber pipe that can withstand the water pressure of high-pressure clean water. The sewage pipe 4 includes a fixed section 40 and a movable section 41. The fixed section 40 is mounted on the rotating boom 22. One end of the fixed section 40 is connected to the inside of the sewage tank 20, and the other end of the fixed section 40 is connected to the movable section 41 through a quick-release connector 42, so that the fixed section 40 and the movable section 41 can be detachably connected. The fixed section 40 of the sewage pipe 4 is mounted on the rotating boom 22, which not only reduces the length of manually connecting the sewage pipe 4, but also greatly reduces the workload of storing the sewage pipe 4 when changing work sites, thereby reducing workload and improving work efficiency.

[0031] Alternatively, the quick-release connector 42 can be a common plug-in type pipe connector or a threaded rotary sealing pipe connector.

[0032] Optionally, the rotating boom 22 is a frame fixed to the top of the carriage 2, and the end of the rotating boom 22 extends to the rear of the carriage 2, so that it can rotate smoothly. The rotating boom 22 can increase the cleaning operation radius without changing the length of the cleaning water pipe 5. The structure or form of the rotating boom 22 can be various. For example, the rotating boom 22 is made of hollow steel pipes welded together to form a crisscross frame. Then, a motor, a reducer, and a bend are installed on the frame. The output end of the motor is connected to the reducer, and the reducer is connected to one end of the bend. The fixed section 40 of the sewage pipe 4 is fixed to the bend. When the motor works, it drives the bend to rotate, which in turn drives the fixed section 40 of the sewage pipe 4 to rotate. The reducer reduces the rotation speed of the bend. The bend is arranged along the axial direction of the carriage 2, and a bearing seat is provided between the bend and the frame, and a rotatable fit is formed by the bearing.

[0033] It is worth mentioning that the cleaning device 3 can not only wash the ground, but also recycle the wastewater generated during the washing process. (Reference) Figure 3The cleaning device 3 can be a wastewater recovery tray, which includes a tray body 30 and a rotating spray bar 31 and a suction pipe 32 mounted on the tray body 30. The tray body 30 has an opening at the bottom, and the suction pipe 32 and the rotating spray bar 31 are mounted on the surface of the opening at the bottom of the tray body 30. The suction pipe 32 is connected to the wastewater pipe 4 through a guide pipe 34, and the rotating spray bar 31 is connected to the cleaning water pipe 5. The suction pipe 32 is used to suck up wastewater from the ground. The pipe wall of the suction pipe 32 has multiple small holes facing the ground. The suction force generated from the small holes draws the wastewater into the suction pipe 32, and then through the guide pipe 34 and the wastewater pipe 4 into the wastewater tank 20. The rotating spray bar 31 is equipped with multiple nozzles 33 facing the ground for rinsing the ground. The number of suction pipes 32 and rotating spray bars 31 can be multiple, and they can be arranged in an alternating pattern or rotated around the center of the tray body 30 to improve the rinsing effect and the efficiency of wastewater recovery. Once the cleaning operation is complete, the wastewater recovery tray can be placed into the tool compartment 24.

[0034] In this embodiment, the clean water tank 21 and the wastewater tank 20 are arranged adjacent to each other, the power compartment 23 is located near the clean water tank 21, and the tool compartment 24 is located near the wastewater tank 20. The suction drive 6 is located in the tool compartment 24, and the water pump 231 is located in the power compartment 23. This arrangement optimizes the overall layout and reduces the length of the pipeline.

[0035] Optionally, the suction drive unit 6 can be a high-powered blower. The air inlet of the blower (i.e., the suction end of the suction drive unit 6) is connected to one end of the duct 60, and the air outlet of the blower is connected to the outside. The other end of the duct 60 extends into the sewage tank 20. When the blower is working, it can suck the air in the sewage tank 20 and the sewage pipe 4, so that the air pressure in the sewage tank 20 and the sewage pipe 4 is lower than the atmospheric pressure. The sewage below the sewage recovery tray can be sucked into the sewage tank 20, while the air sucked by the blower is discharged to the external environment. The end of the duct 60 located inside the sewage tank 20 is set in the top area of ​​the sewage tank 20, which can prevent the sewage inside the sewage tank 20 from entering the duct 60.

[0036] The wastewater tank 20 is equipped with a level gauge 8. The air duct 60 is located above the outlet of the wastewater pipe 4, and the level gauge 8 is located below the wastewater pipe 4. The level gauge 8 can continuously monitor the wastewater level inside the wastewater tank 20 and transmit the detected information to the vehicle's control center. When the wastewater reaches a predetermined level, the blower stops working, prompting the wastewater to be discharged to prevent backflow or entry into the air duct 60. The level gauge 8 can be a float-type level gauge or other types of level gauges available on the market; there are no restrictions on which type to use.

[0037] In order to clean the sewage tank 20 in a timely manner and prevent grease, dust and other debris in the sewage from adhering to the inner wall of the sewage tank 20, a self-cleaning mechanism 7 is also provided in the top area inside the sewage tank 20. The self-cleaning mechanism 7 is used to rinse the inner wall of the sewage tank 20 to keep the inner wall of the sewage tank 20 in a relatively clean state. The self-cleaning mechanism 7 is connected to the clean water tank 21 or the cleaning water pipe 5.

[0038] Refer again Figure 2 The self-cleaning mechanism 7 includes a spray pipe 70 and nozzles 71. The spray pipe 70 is fixed to the inner wall of the wastewater tank 20, and the nozzles 71 are mounted on the spray pipe 70. The spray pipe 70 is connected to the clean water tank 21 or the cleaning water pipe 5. Clean water is sprayed from the spray pipe 70 through the nozzles 71 to rinse the inner wall of the wastewater tank 20. The spray pipe 70 is a U-shaped pipe with multiple nozzles 71 connected to its lower part. The nozzles 71 are inclined and face the inner wall of the wastewater tank 20. The nozzles 71 can be fan-shaped nozzles to rinse the wastewater tank 20 over a large area. The spray pipe 70 is fixed inside the wastewater tank 20 by a bracket 72. For example, the bracket 72 is a U-shaped ring, with the open end of the U-shaped ring welded or bonded to the inner wall of the wastewater tank 20. The spray pipe 70 passes through the U-shaped ring and is supported by the U-shaped ring. Of course, the level gauge 8 is located below the nozzles 71, thus effectively cleaning the wastewater tank 20 without allowing wastewater to enter the nozzles 71 or the spray pipe 70.

[0039] refer to Figure 4 and Figure 5 When the sewage tank 20 is an independently set independent tank 26, the independent tank 26 is set inside the tool compartment 24. The independent tank 26 includes a tank body 261 and a sewage recovery port 202 and a suction port 203 set on the tank body 261. The sewage recovery port 202 and the suction port 203 both penetrate the tank body 261 and are set at the top of the tank body 261. The suction port 203 is connected to the air duct 60, and the sewage recovery port 202 is connected to the end of the fixed section 40 of the sewage pipe 4. The blower draws air from the sewage tank 20 through the suction port 203 to form a negative pressure. The sewage drawn by the negative pressure is discharged into the tank body 261 of the independent tank 26 through the sewage recovery port 202.

[0040] The bottom of the independent container 26's body 261 is equipped with a drain port 204, through which sewage or solid waste can be discharged. The drain port 204 is lower than the plane of the bottom wall of the independent container 26, and this recessed opening design facilitates sewage discharge. A drain valve 2041 is installed at the drain port 204, which controls the timing of sewage discharge. The drain valve 2041 is only opened to discharge sewage when the sewage in the independent container 26 reaches a predetermined height, and is closed at other times. The drain valve 2041 can be a solenoid valve to facilitate communication with the vehicle's control center. Alternatively, a drain door can be installed at the drain port 204. The drain door is movably connected to the body 261, allowing manual opening for sewage discharge and facilitating the cleaning of solid waste or silt inside the body 261. The drain door is rotatably connected to the body 261 via a hinge, and the connecting end is equipped with a sealing ring to prevent sewage leakage.

[0041] The independent container 26 also has a side-opening door 262 on its body 261. The side-opening door 262 is sealed to the body 261. The height of the drain outlet 204 is lower than the plane of the bottom wall of the independent container 26. This recessed opening design does not affect the setting of the side-opening door 262. The side-opening door 262 allows access to the interior of the body 261, facilitating the replacement of parts inside the body 261 or the cleaning of fixed waste. The side-opening door 262 is rotatably connected to the body 261. The side-opening door 262 can be a push-button type door. The inner wall of the push-button type door is equipped with a rubber sealing strip, which can form a good seal with the body 261 when closed, ensuring that the sewage inside the body 261 will not leak. The push-button type door is an existing technology product and is a common product on the market. Its structure will not be described in detail here.

[0042] A wastewater collector 263 is installed below the side-opening door 262. The wastewater collector 263 collects wastewater dripping from the side-opening door 262 when it is opened. The wastewater collector 263 can be formed by bending sheet metal and has an opening groove. The opening groove is in the same vertical direction as the side-opening door 262, allowing it to receive wastewater dripping from the side-opening door 262. The wastewater collector 263 is welded to the housing 261 or bonded with sealant. A through hole is provided at the bottom of the wastewater collector 263, and a drain ball valve 2631 is installed at the through hole. When the wastewater collected by the wastewater collector 263 reaches a certain amount, the drain ball valve 2631 can be opened to discharge the wastewater.

[0043] Of course, when the sewage tank 20 is not an independent tank 26, it is also equipped with a sewage recovery port 202, a suction port 203 and a sewage discharge port 204, and the configuration is the same as that of the independent tank 26. The difference is that the sewage tank 20 may not be equipped with a side door 262 at this time.

[0044] Optionally, when the sewage tank 20 is formed by the partition separating the carriage 2, the top of the sewage tank 20 is also provided with an inspection port 25. An inspection cover is connected to the inspection port 25. The inspection cover is rotatably connected to the carriage 2 via a hinge. Maintenance personnel can enter the sewage tank 20 through the inspection port 25 to carry out maintenance or replacement of parts and other operations.

[0045] It is worth mentioning that in this embodiment, the independent tank 26 and the sewage tank 20 formed by the partition are optionally provided.

[0046] This embodiment of the road maintenance vehicle uses a blower to generate negative pressure to recover wastewater, replacing the existing method of using jet high-pressure water siphon to recover wastewater. This not only reduces water waste but also allows for wastewater recovery even after cleaning has stopped, resulting in better wastewater recovery and preventing secondary pollution. Furthermore, the fixed section 40 of the wastewater pipe 4 and a portion of the cleaning water pipe 5 are mounted on the rotating boom 22. The rotating boom 22 supports the weight of the cleaning water pipe 5 and the fixed section 40 of the wastewater pipe 4, reducing the movable length and weight of the cleaning water pipe 5 and the wastewater pipe 4. This makes cleaning the ground easier and more convenient. The rotating boom 22 also helps cleaning operators overcome obstacles, allowing them to clean hard-to-reach areas or work in confined spaces.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A road maintenance vehicle, characterized in that, include: Chassis (1); The carriage (2) is installed on the chassis (1). The carriage (2) is equipped with a sewage tank (20) and a clean water tank (21). The carriage (2) is equipped with a rotating boom (22) and a cleaning device (3) on the outside. The cleaning device (3) is connected to the sewage tank (20) through a sewage pipe (4). The cleaning device (3) is connected to the clean water tank (21) through a cleaning water pipe (5). The cleaning water pipe (5) and the sewage pipe (4) are at least partially installed on the rotating boom (22). A suction drive (6) is used to create a negative pressure in the wastewater tank (20) to draw out the wastewater generated by the cleaning device (3).

2. The road maintenance vehicle according to claim 1, characterized in that, The cleaning device (3) is a sewage recovery tray. The sewage recovery tray is equipped with a rotating spray bar (31) and a suction pipe (32). The rotating spray bar (31) is connected to the cleaning water pipe (5), and the suction pipe (32) is connected to the sewage pipe (4).

3. The road maintenance vehicle according to claim 1, characterized in that, The end of the cleaning water pipe (5) is connected to a water pump (231), and the inlet of the water pump (231) is connected to the clean water tank (21).

4. The road maintenance vehicle according to claim 3, characterized in that, The carriage (2) is also equipped with a power compartment (23) and a tool compartment (24). The sewage suction drive unit (6) is located in the tool compartment (24), and the water pump (231) is located in the power compartment (23). The clean water tank (21) is arranged adjacent to the sewage tank (20), the power compartment (23) is arranged on the side closer to the clean water tank (21), and the tool compartment (24) is arranged on the side closer to the sewage tank (20).

5. The road maintenance vehicle according to claim 1, characterized in that, The sewage pipe (4) includes a fixed section (40) and a movable section (41). The fixed section (40) is mounted on the rotating arm (22), and the fixed section (40) and the movable section (41) are connected by a quick-release connector (42).

6. The road maintenance vehicle according to claim 1, characterized in that, The sewage tank (20) is equipped with a self-cleaning mechanism (7) inside. The self-cleaning mechanism (7) is used to rinse the inner wall of the sewage tank (20). The self-cleaning mechanism (7) is connected to the clean water tank (21) or the cleaning water pipe (5).

7. The road maintenance vehicle according to claim 6, characterized in that, The self-cleaning mechanism (7) includes a spray pipe (70) and a nozzle (71). The spray pipe (70) is fixed to the inner wall of the sewage tank (20), and the nozzle (71) is installed on the spray pipe (70). The spray pipe (70) is connected to the clean water tank (21) or the cleaning water pipe (5).

8. The road maintenance vehicle according to claim 7, characterized in that, The sewage tank (20) is equipped with a level gauge (8) inside, and the height of the level gauge (8) is lower than that of the nozzle (71).

9. The road maintenance vehicle according to claim 4, characterized in that, The sewage tank (20) is an independent tank (26), which is located in the tool compartment (24). The independent tank (26) is also provided with a side door (262) on the body (261). The side door (262) is sealed to the body (261), and a sewage collector (263) is provided below the side door (262).

10. The road maintenance vehicle according to any one of claims 1-9, characterized in that, The top of the sewage tank (20) is provided with a sewage recovery port (202) and a suction port (203). The sewage recovery port (202) is connected to the sewage pipe (4), and the suction port (203) is connected to the suction end of the sewage suction drive (6). The bottom of the sewage tank (20) is provided with a sewage discharge port (204). The height of the sewage discharge port (204) is lower than the plane where the bottom wall of the sewage tank (20) is located. A sewage discharge switch valve (2041) is provided at the sewage discharge port (204).

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