Spraying device of cleaning vehicle

Abstract

The utility model relates to the technical field of cleaning vehicles, in particular to a spraying device of a cleaning vehicle, which can adjust the cleaning height, clean facilities such as the ground, guardrails, guideboards and the like, reduce the limitation and have good universality. A water tank and a water pump are included; cleaning water is stored in the water tank, the water pump pumps out the cleaning water through the pipeline and conveys the cleaning water to the upper water pipe through the pipeline, the upper end of the sleeve is closed, the lower end of the sleeve is slidably arranged on the upper water pipe in a sleeving mode, and the two ends of the sleeve are provided with the two ends of the double-end air cylinder. The fixed end of the double-head air cylinder is installed on the outer wall of the lower end of the sleeve, two piston rods of the double-head air cylinder are both provided with the friction clamping blocks, the two friction clamping blocks are oppositely arranged on the two sides of the water feeding pipe, the spraying pipe is communicated with the upper end of the sleeve, and a plurality of spraying heads are arranged on the spraying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning vehicles, in particular to a spray device for a cleaning vehicle. Background Art

[0002] In order to ensure the cleanliness of urban roads and the normal operation of urban highways, the urban highways need to be cleaned several times a day. Cleaning vehicles that use water spray to clean the soil and fine particles on the urban road surface are already relatively common.

[0003] The Chinese utility model patent with the publication number of CN213389939U in the prior art proposes a high-pressure cleaning vehicle. The cleaning vehicle is respectively provided with a spray pipe and a cleaning pipe. When the cleaning vehicle is working normally to clean the road surface, the control valve on the spray pipe is opened, and the water in the water tank is pressurized by a high-pressure water pump and then used to clean the road surface through the spray pipe. When it is necessary to clean the water tank, the control valve on the cleaning pipe is opened, and the water in the water tank is pressurized by the high-pressure water pump and then enters the rotary sprinkler to realize the cleaning of the water tank, and the sewage after cleaning can be discharged through the sewage pipe.

[0004] However, the height and length of the spray pipe of the spray device of the above cleaning vehicle are generally fixedly set, which is not convenient to adjust the height of the spray pipe and can only clean the ground, resulting in a large limitation in cleaning. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides a spray device for a cleaning vehicle that can adjust the cleaning height, clean facilities such as the ground, guardrails, and road signs, reduce limitations, and has good versatility.

[0006] A spray device for a cleaning vehicle of the utility model comprises a water tank and a water pump; it further includes an upper water pipe, a sleeve, a double-headed cylinder, friction clamping blocks, a spray pipe and a plurality of spray heads. The water tank stores cleaning water. The water pump pumps out the cleaning water through a pipeline and conveys the cleaning water to the upper water pipe through a pipeline. The upper end of the sleeve is closed, and the lower end of the sleeve is slidably sleeved on the upper water pipe. The fixed end of the double-headed cylinder is installed on the outer wall of the lower end of the sleeve. Friction clamping blocks are installed on both piston rods of the double-headed cylinder. The two friction clamping blocks are arranged oppositely on both sides of the upper water pipe. The spray pipe is communicated with the upper end of the sleeve, and a plurality of spray heads are arranged on the spray pipe. The water tank stores cleaning water. When cleaning the road surface, the water pump operates to pump out the cleaning water through a pipeline and convey it to the upper water pipe. The cleaning water enters the sleeve through the upper water pipe, then enters the spray pipe and is sprayed out through a plurality of spray heads to clean the road surface. When it is necessary to raise the height of the spray pipe, the two piston rods of the double-headed cylinder extend, so that the two friction clamping blocks are separated from the upper water pipe. Under the action of water pressure, the sleeve is pushed up along the upper water pipe, and the sleeve drives the spray pipe to rise. When it is necessary to lower the height of the spray pipe, the water pump is turned off, so that the water pressure in the upper water pipe and the sleeve is reduced, and the sleeve slides down along the upper water pipe under the action of its own gravity, thereby realizing the adjustment of the height of the spray pipe and a plurality of spray heads, realizing the cleaning of facilities such as the ground, guardrails, road signs, etc., reducing the limitations of cleaning and having good versatility.

[0007] Preferably, it further includes a water suction pipe and a water outlet pipe. A water storage chamber is arranged inside the water tank. The input end of the water suction pipe extends into the water storage chamber of the water tank. The output end of the water suction pipe is connected to the water inlet of the water pump. The input end of the water outlet pipe is connected to the water outlet of the water pump. The output end of the water outlet pipe is connected to the input end of the upper water pipe. The water pump pumps out the cleaning water in the water storage chamber of the water tank through the water suction pipe and conveys the cleaning water to the upper water pipe through the water outlet pipe. The technology is mature and reliable.

[0008] Preferably, it further includes a partition plate, a compressor, a three-way valve, a return pipe and a connecting pipe. The partition plate is installed in the water storage chamber of the water tank. The partition plate divides the water storage chamber into a low-pressure area and a high-pressure area. The input end of the water extraction pipe extends into the low-pressure area of the water storage chamber. The compressor is installed on the water tank. The compressor inputs compressed air into the high-pressure area of the water storage chamber of the water tank. The output end of the water outlet pipe is connected to the first channel of the three-way valve. One end of the return pipe is connected to the second channel of the three-way valve, and the other end of the return pipe extends into the high-pressure area of the water storage chamber of the water tank. One end of the connecting pipe is connected to the third channel of the three-way valve, and the other end of the connecting pipe is connected to the input end of the water supply pipe. During daily cleaning, the three-way valve is switched to connect the water outlet pipe and the return pipe. The water pump operates to make the cleaning water in the low-pressure area of the water storage chamber of the water tank enter the high-pressure area of the water storage chamber of the water tank through the water extraction pipe, the water outlet pipe and the return pipe. The water pump is turned off, and the compressor inputs high-pressure air into the high-pressure area. The compressor stops, and the three-way valve is switched to connect the return pipe, the connecting pipe and the water supply pipe, so that the cleaning water in the high-pressure area of the water storage chamber of the water tank is transported to the sleeve and the spray pipe through the return pipe, the connecting pipe and the water supply pipe and sprayed out through multiple nozzles. Thus, it is not necessary to keep the water pump always on during the cleaning work, which prolongs the service life of the water pump and can ensure the spraying pressure of the cleaning water. During emergency cleaning, the three-way valve is switched to connect the water extraction pipe, the water outlet pipe, the connecting pipe and the water supply pipe, so that the water pump directly pumps water from the low-pressure area of the water storage chamber of the water tank, resulting in a greater water outlet pressure and realizing the cleaning of stubborn stains, with good practicability.

[0009] Preferably, it further includes a first liquid level probe and a second liquid level probe. Both the first liquid level probe and the second liquid level probe are installed in the high-pressure area of the water storage chamber of the water tank. The first liquid level probe is located at the high position of the water tank, and the second liquid level probe is located at the low position of the water tank. The first liquid level probe and the second liquid level probe detect the high water level and the low water level in the high-pressure area of the water storage chamber of the water tank. When the first liquid level probe detects the high water level, the water pump stops running. When the second liquid level probe detects the low water level, the water pump starts running, keeping the water level and water pressure in the high-pressure area of the water storage chamber stable.

[0010] Preferably, it further includes a pressure probe. The pressure probe is installed on the water tank, and the probe of the pressure probe extends into the high-pressure area of the water storage chamber of the water tank. The pressure probe detects the air pressure in the high-pressure area of the water storage chamber of the water tank. When the air pressure is too low, the compressor starts to input high-pressure air into the high-pressure area of the water storage chamber of the water tank. When the air pressure reaches the set value, the compressor stops, keeping the air pressure in the high-pressure area of the water storage chamber stable.

[0011] Preferably, it further includes a rotary joint, a first gear ring, a motor, and a gear. The output end of the connecting pipe is installed with the rotary joint, and the input end of the water supply pipe is rotatably installed in the rotary joint. The first gear ring is coaxially installed on the outer wall of the water supply pipe. The motor is installed on the rotary joint, and the output shaft of the motor is coaxially installed with the gear. The gear meshes with the first gear ring. The motor drives the gear to rotate, and the gear meshes to drive the first gear ring to rotate. The first gear ring drives the water supply pipe to rotate, thereby adjusting the inclination angle of the water supply pipe, enabling the water supply pipe to be leveled and erected, thus changing the cleaning range of the road surface and improving the practicability.

[0012] Preferably, it further includes a rotary connecting pipe, a second gear ring, a cylinder, and a limiting block. One end of the spray pipe is fixedly provided with the rotary connecting pipe. The spray pipe is communicated with the sleeve through the rotary connecting pipe. The rotary connecting pipe is rotatably connected to the upper end of the sleeve. The second gear ring is coaxially installed on the rotary connecting pipe. The fixed end of the cylinder is installed on the sleeve, and the piston rod of the cylinder is installed with the limiting block. The limiting block is provided with a plurality of limiting teeth meshing with the second gear ring. When it is necessary to adjust the relative angle between the spray pipe and the sleeve, the piston rod of the cylinder contracts, so that the limiting block disengages from the second gear ring, enabling the spray pipe to rotate around the rotary connecting pipe to adjust the angle. The piston rod of the cylinder extends, so that a plurality of limiting teeth of the limiting block mesh with the second gear ring, thereby locking the second gear ring and realizing the adjustment of the angle of the spray pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The cleaning water is stored in the water tank. When cleaning the road surface, the water pump operates to pump out the cleaning water through the pipeline and convey it to the water supply pipe. The cleaning water enters the sleeve through the water supply pipe and then enters the spray pipe and is sprayed out through a plurality of nozzles to clean the road surface. When it is necessary to raise the height of the spray pipe, the two piston rods of the double-headed cylinder extend, so that the two friction clamping blocks disengage from the water supply pipe. Under the action of water pressure, the sleeve is pushed up along the water supply pipe, and the sleeve drives the spray pipe to rise. When it is necessary to lower the height of the spray pipe, the water pump is turned off, so that the water pressure in the water supply pipe and the sleeve decreases, and the sleeve slides down along the water supply pipe under the action of its own gravity, thereby realizing the adjustment of the height of the spray pipe and a plurality of nozzles, realizing the cleaning of facilities such as the ground, guardrails, and road signs, reducing the limitation of cleaning, and having good versatility. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present utility model;

[0015] Figure 2 is the front sectional structural schematic diagram of the present utility model;

[0016] Figure 3 is the structural schematic diagram of structures such as the water pump, water supply pipe, sleeve, double-headed cylinder, friction clamping block, spray pipe, and pipeline;

[0017] Figure 4 is Figure 1 the partial enlarged structural schematic diagram at A in

[0018] Figure 5 is Figure 1 A partial enlarged structural schematic diagram at position B in

[0019] Figure 6 is Figure 1 A partial enlarged structural schematic diagram at position C in

[0020] Reference numerals in the drawings: 1, water tank; 2, water pump; 3, upper water pipe; 4, sleeve; 5, double-headed cylinder; 6, friction clamping block; 7, spray pipe; 8, spray head; 9, water suction pipe; 10, water outlet pipe; 11, partition board; 12, compressor; 13, three-way valve; 14, return pipe; 15, connecting pipe; 16, liquid level probe 1; 17, liquid level probe 2; 18, rotary joint; 19, gear ring 1; 20, motor; 21, gear; 22, rotary connecting pipe; 23, gear ring 2; 24, cylinder; 25, limit block; 26, pressure probe. Detailed implementation manners

[0021] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present utility model is more thorough and comprehensive. Embodiment 1

[0022] As Figure 1 , Figure 1 and Figure 4 shown, a spray device for a cleaning vehicle includes a water tank 1 and a water pump 2; it further includes an upper water pipe 3, a sleeve 4, a double-headed cylinder 5, friction clamping blocks 6, a spray pipe 7 and a plurality of spray heads 8. The water tank 1 stores cleaning water. The water pump 2 pumps out the cleaning water through a pipeline, and the water pump 2 conveys the cleaning water to the upper water pipe 3 through a pipeline. The upper end of the sleeve 4 is closed, and the lower end of the sleeve 4 is slidably sleeved on the upper water pipe 3. The fixed end of the double-headed cylinder 5 is installed on the outer wall of the lower end of the sleeve 4. Both piston rods of the double-headed cylinder 5 are installed with friction clamping blocks 6. The two friction clamping blocks 6 are arranged oppositely on both sides of the upper water pipe 3. The spray pipe 7 is communicated with the upper end of the sleeve 4, and a plurality of spray heads 8 are arranged on the spray pipe 7; it further includes a water suction pipe 9 and a water outlet pipe 10. A water storage chamber is arranged inside the water tank 1. The input end of the water suction pipe 9 extends into the water storage chamber of the water tank 1. The output end of the water suction pipe 9 is connected to the water inlet of the water pump 2. The input end of the water outlet pipe 10 is connected to the water outlet of the water pump 2. The output end of the water outlet pipe 10 is connected to the input end of the upper water pipe 3.

[0023] The cleaning water is stored in the water tank 1. When cleaning the road surface, the water pump 2 operates to draw out the cleaning water through the water suction pipe 9 and convey it to the water supply pipe 3. The cleaning water enters the sleeve 4 through the water outlet pipe 10 and the water supply pipe 3, then enters the spray pipe 7 and is sprayed out through a plurality of nozzles 8 to clean the road surface. When it is necessary to raise the height of the spray pipe 7, the two piston rods of the double-headed cylinder 5 extend, causing the two friction clamping blocks 6 to disengage from the water supply pipe 3. Under the action of water pressure, the sleeve 4 is pushed up along the water supply pipe 3, and the sleeve 4 drives the spray pipe 7 to rise. When it is necessary to lower the height of the spray pipe 7, the water pump 2 is turned off, causing the water pressure in the water supply pipe 3 and the sleeve 4 to decrease, so that the sleeve 4 slides down along the water supply pipe 3 under the action of its own gravity, thereby realizing the adjustment of the height of the spray pipe 7 and a plurality of nozzles 8, realizing the cleaning of facilities such as the ground, guardrails, and road signs, and reducing the limitations of cleaning. Embodiment 2

[0024] As Figures 1 to 3 shown, on the basis of Embodiment 1, it further includes a partition 11, a compressor 12, a three-way valve 13, a return pipe 14, and a connecting pipe 15. The partition 11 is installed in the water storage chamber of the water tank 1. The partition 11 divides the water storage chamber into a low-pressure area and a high-pressure area. The input end of the water suction pipe 9 extends into the low-pressure area of the water storage chamber. The compressor 12 is installed on the water tank 1. The compressor 12 inputs compressed air into the high-pressure area of the water storage chamber of the water tank 1. The output end of the water outlet pipe 10 is connected to the first channel of the three-way valve 13. One end of the return pipe 14 is connected to the second channel of the three-way valve 13, and the other end of the return pipe 14 extends into the high-pressure area of the water storage chamber of the water tank 1. One end of the connecting pipe 15 is connected to the third channel of the three-way valve 13, and the other end of the connecting pipe 15 is connected to the input end of the water supply pipe 3; it further includes a liquid level probe 16 and a liquid level probe 17. Both the liquid level probe 16 and the liquid level probe 17 are installed in the high-pressure area of the water storage chamber of the water tank 1. The liquid level probe 16 is located at the high position of the water tank 1, and the liquid level probe 17 is located at the low position of the water tank 1; it further includes a pressure probe 26. The pressure probe 26 is installed on the water tank 1, and the probe of the pressure probe 26 extends into the high-pressure area of the water storage chamber of the water tank 1.

[0025] During daily cleaning, the three-way valve 13 is switched so that the water outlet pipe 10 is connected to the return pipe 14. The water pump 2 operates to make the cleaning water in the low-pressure area of the water storage chamber of the water tank 1 enter the high-pressure area of the water storage chamber of the water tank 1 through the water suction pipe 9, the water outlet pipe 10 and the return pipe 14. The water pump 2 is turned off, and the compressor 12 inputs high-pressure air into the high-pressure area. The compressor 12 stops, and the three-way valve 13 is switched so that the return pipe 14, the connecting pipe 15 and the water supply pipe 3 are connected. The cleaning water in the high-pressure area of the water storage chamber of the water tank 1 is transported to the sleeve 4 and the spray pipe 7 through the return pipe 14, the connecting pipe 15 and the water supply pipe 3 and sprayed out through a plurality of nozzles 8. Thus, it is not necessary for the water pump 2 to be always turned on during the cleaning work, the service life of the water pump 2 is prolonged, and the spraying pressure of the cleaning water can be guaranteed. During emergency cleaning, the three-way valve 13 is switched to connect the water suction pipe 9, the water outlet pipe 10, the connecting pipe 15 and the water supply pipe 3, so that the water pump 2 directly pumps water from the low-pressure area of the water storage chamber of the water tank 1, resulting in a greater water outlet pressure to achieve the cleaning of stubborn stains. The liquid level probe one 16 and the liquid level probe two 17 detect the high water level and the low water level in the high-pressure area of the water storage chamber of the water tank 1. When the liquid level probe one 16 detects the high water level, the water pump 2 stops running. When the liquid level probe two 17 detects the low water level, the water pump 2 starts running to keep the water level and water pressure in the high-pressure area of the water storage chamber stable. The pressure probe 26 detects the air pressure in the high-pressure area of the water storage chamber of the water tank 1. When the air pressure is too low, the compressor 12 starts to input high-pressure air into the high-pressure area of the water storage chamber of the water tank 1. When the air pressure reaches the set value, the compressor 12 stops to keep the air pressure in the high-pressure area of the water storage chamber stable. Embodiment 3

[0026] As Figure 3 、 Figure 5 and Figure 6 shown, on the basis of Embodiment 1, it further includes a rotary joint 18, a first gear ring 19, a motor 20 and a gear 21. The output end of the connecting pipe 15 is installed with the rotary joint 18, and the input end of the water supply pipe 3 is rotatably installed in the rotary joint 18. The first gear ring 19 is concentrically installed on the outer wall of the water supply pipe 3. The motor 20 is installed on the rotary joint 18, and the output shaft of the motor 20 is concentrically installed with the gear 21. The gear 21 meshes with the first gear ring 19. It further includes a rotary connecting pipe 22, a second gear ring 23, a cylinder 24 and a limiting block 25. One end of the spray pipe 7 is fixedly provided with the rotary connecting pipe 22. The spray pipe 7 is communicated with the sleeve 4 through the rotary connecting pipe 22. The rotary connecting pipe 22 is rotatably connected to the upper end of the sleeve 4. The second gear ring 23 is concentrically installed on the rotary connecting pipe 22. The fixed end of the cylinder 24 is installed on the sleeve 4, and the piston rod of the cylinder 24 is installed with the limiting block 25. The limiting block 25 is provided with a plurality of limiting teeth meshing with the second gear ring 23.

[0027] The motor 20 drives the gear 21 to rotate. The gear 21 meshes with and drives the first ring gear 19 to rotate. The first ring gear 19 drives the upper water pipe 3 to rotate, thereby adjusting the inclination angle of the upper water pipe 3 so that the upper water pipe 3 can be flattened and erected, thus changing the cleaning range of the road. When it is necessary to adjust the relative angle between the spray pipe 7 and the sleeve 4, the piston rod of the cylinder 24 contracts, causing the limit block 25 to disengage from the second ring gear 23, enabling the spray pipe 7 to rotate around the rotary connection pipe 22 to adjust the angle. The piston rod of the cylinder 24 extends, causing multiple limit teeth of the limit block 25 to mesh with the second ring gear 23, thereby locking the second ring gear 23 and achieving the adjustment of the angle of the spray pipe 7.

[0028] As Figures 1 to 6 shown, in a spray device of a cleaning vehicle of the present utility model, during operation, first, the water tank 1 stores cleaning water. When cleaning the road surface, the water pump 2 operates to pump out the cleaning water through a pipeline and convey it to the upper water pipe 3. The cleaning water enters the sleeve 4 through the upper water pipe 3 and then enters the spray pipe 7 and is sprayed out through multiple nozzles 8 to clean the road surface. After that, when it is necessary to raise the height of the spray pipe 7, the two piston rods of the double-headed cylinder 5 extend, causing the two friction clamping blocks 6 to disengage from the upper water pipe 3. Under the action of water pressure, the sleeve 4 is pushed up along the upper water pipe 3, and the sleeve 4 drives the spray pipe 7 to rise. When it is necessary to lower the height of the spray pipe 7, the water pump 2 is turned off, causing the water pressure in the upper water pipe 3 and the sleeve 4 to decrease, enabling the sleeve 4 to slide down along the upper water pipe 3 under the action of its own gravity, thereby realizing the adjustment of the height of the spray pipe 7 and multiple nozzles 8. Then, the motor 20 drives the gear 21 to rotate. The gear 21 meshes with and drives the first ring gear 19 to rotate. The first ring gear 19 drives the upper water pipe 3 to rotate, thereby adjusting the inclination angle of the upper water pipe 3 so that the upper water pipe 3 can be flattened and erected, thus changing the cleaning range of the road. Finally, when it is necessary to adjust the relative angle between the spray pipe 7 and the sleeve 4, the piston rod of the cylinder 24 contracts, causing the limit block 25 to disengage from the second ring gear 23, enabling the spray pipe 7 to rotate around the rotary connection pipe 22 to adjust the angle. The piston rod of the cylinder 24 extends, causing multiple limit teeth of the limit block 25 to mesh with the second ring gear 23, thereby locking the second ring gear 23 and achieving the adjustment of the angle of the spray pipe 7, and then cleaning facilities such as the ground, guardrails, and road signs can be realized.

[0029] The main functions achieved by the present utility model are:

[0030] 1. It can adjust the cleaning height, clean facilities such as the ground, guardrails, and road signs, reduce limitations, and has good versatility;

[0031] 2. During daily cleaning, water is pressed by compressed air, extending the service life of the water pump;

[0032] 3. It can flexibly adjust the angle and range of spray cleaning.

[0033] A spraying device for a cleaning vehicle of the present utility model, its installation method, connection method or setting method are all common mechanical methods, and any implementation that can achieve its beneficial effects can be carried out; the water tank 1, water pump 2, upper water pipe 3, sleeve 4, double-headed cylinder 5, friction clamp 6, spray pipe 7, spray head 8, compressor 12, three-way valve 13, liquid level probe 1 16, liquid level probe 2 17, pressure probe 26, rotary joint 18, gear ring 1 19, motor 20, gear 21, gear ring 2 23, cylinder 24, limit block 25 of the spraying device for a cleaning vehicle of the present utility model are purchased on the market. Those skilled in the art only need to install and operate according to the attached operation manual, without the need for those skilled in the art to make creative efforts.

[0034] All the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A spray device for a cleaning vehicle, comprising a water tank (1) and a water pump (2); characterized in that, It further includes a water supply pipe (3), a sleeve (4), a double-headed cylinder (5), friction clamping blocks (6), a spray pipe (7) and a plurality of spray nozzles (8). Cleaning water is stored in the water tank (1). The water pump (2) pumps out the cleaning water through a pipeline, and the water pump (2) conveys the cleaning water to the water supply pipe (3) through a pipeline. The upper end of the sleeve (4) is closed, and the lower end of the sleeve (4) is slidably sleeved on the water supply pipe (3). The fixed end of the double-headed cylinder (5) is installed on the outer wall of the lower end of the sleeve (4). Friction clamping blocks (6) are installed on both piston rods of the double-headed cylinder (5). The two friction clamping blocks (6) are arranged oppositely on both sides of the water supply pipe (3). The spray pipe (7) is communicated with the upper end of the sleeve (4), and a plurality of spray nozzles (8) are arranged on the spray pipe (7).

2. The spray device of a cleaning vehicle according to claim 1, wherein, It further includes a water suction pipe (9) and a water outlet pipe (10). A water storage chamber is arranged inside the water tank (1). The input end of the water suction pipe (9) extends into the water storage chamber of the water tank (1), the output end of the water suction pipe (9) is connected to the water inlet of the water pump (2), the input end of the water outlet pipe (10) is connected to the water outlet of the water pump (2), and the output end of the water outlet pipe (10) is connected to the input end of the water supply pipe (3).

3. The spray device of a cleaning vehicle according to claim 2, characterized in that, It further includes a partition plate (11), a compressor (12), a three-way valve (13), a return pipe (14) and a connecting pipe (15). The partition plate (11) is installed in the water storage chamber of the water tank (1). The partition plate (11) divides the water storage chamber into a low-pressure area and a high-pressure area. The input end of the water suction pipe (9) extends into the low-pressure area of the water storage chamber. The compressor (12) is installed on the water tank (1), and the compressor (12) inputs compressed air into the high-pressure area of the water storage chamber of the water tank (1). The output end of the water outlet pipe (10) is connected to the first channel of the three-way valve (13). One end of the return pipe (14) is connected to the second channel of the three-way valve (13), and the other end of the return pipe (14) extends into the high-pressure area of the water storage chamber of the water tank (1). One end of the connecting pipe (15) is connected to the third channel of the three-way valve (13), and the other end of the connecting pipe (15) is connected to the input end of the water supply pipe (3).

4. The spray device of a cleaning vehicle according to claim 3, characterized in that, It further includes a first liquid level probe (16) and a second liquid level probe (17). Both the first liquid level probe (16) and the second liquid level probe (17) are installed in the high-pressure area of the water storage chamber of the water tank (1). The first liquid level probe (16) is located at the high position of the water tank (1), and the second liquid level probe (17) is located at the low position of the water tank (1).

5. The spray device of a cleaning vehicle according to claim 3, characterized in that, It further includes a pressure probe (26). The pressure probe (26) is installed on the water tank (1), and the probe of the pressure probe (26) extends into the high-pressure area of the water storage chamber of the water tank (1).

6. The spray device of a cleaning vehicle according to claim 3, characterized in that, It further includes a rotary joint (18), a first gear ring (19), a motor (20) and a gear (21). The output end of the connecting pipe (15) is installed with the rotary joint (18). The input end of the water supply pipe (3) is rotatably installed in the rotary joint (18). The first gear ring (19) is concentrically installed on the outer wall of the water supply pipe (3). The motor (20) is installed on the rotary joint (18), and the output shaft of the motor (20) is concentrically installed with the gear (21). The gear (21) meshes with the first gear ring (19).

7. The spray device of a cleaning vehicle according to claim 1, characterized in that, It further includes a rotating adapter (22), a second gear ring (23), a cylinder (24) and a limit block (25). One end of the nozzle (7) is fixedly provided with the rotating adapter (22). The nozzle (7) is communicated with the sleeve (4) through the rotating adapter (22). The rotating adapter (22) is rotatably connected to the upper end of the sleeve (4). The second gear ring (23) is concentrically installed on the rotating adapter (22). The fixed end of the cylinder (24) is installed on the sleeve (4). The piston rod of the cylinder (24) is installed with the limit block (25). The limit block (25) is provided with a plurality of limit teeth meshing with the second gear ring (23).

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