Self-cleaning circulating system for sewage tank of cleaning and sweeping vehicle

Abstract

The invention relates to the technical field of sewage tanks, in particular to a cleaning and sweeping vehicle sewage tank self-cleaning circulation system which comprises a sewage tank, a primary cleaning device, a communicating pipe, a solid removal tank, a water passing pipe, a solid filtering pipe, a secondary cleaning device, a separation tank, a middle partition plate, a dust removal tank, a dust removal motor, a water outlet pipe, an isolation block, an isolation electric cylinder and a liquid dispersing device. The silt is tightly attached to the inner wall of the dust removal tank under the action of the centrifugal force, and the clear water penetrates through water filtering holes in the inner wall of the dust removal tank and enters an upper-layer space, separated by a middle partition plate, of the separation tank; and the water flows into the clean water tank along the water outlet pipe to supplement clean water for the clean water tank, so that the technical effect of recycling water resources is achieved, the road cleaning time after the cleaning and sweeping vehicle is filled with water at a time is greatly prolonged, the pause of the cleaning and sweeping vehicle caused by the water resource problem is avoided, and the working efficiency of the cleaning and sweeping vehicle is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage tanks, in particular to a self-cleaning circulation system for a sewage tank of a washing and sweeping vehicle. Background Art

[0002] A washing and sweeping vehicle is a multifunctional sanitation vehicle that combines the functions of road sweeping and cleaning. Through the synergistic effect of high-pressure water flow and mechanical brushes, it can effectively remove garbage, dust, sand and other pollutants on the road, and wash and clean the road surface. Washing and sweeping vehicles are usually equipped with a variety of cleaning accessories such as garbage collection boxes, clean water tanks, sewage tanks, etc., and can operate efficiently in different environments. They are widely used in places such as urban roads, squares, airports and industrial parks.

[0003] When the road washer and sweeper is cleaning the road, first, the high-pressure pump draws clean water from the clean water tank and sprays the high-pressure water flow onto the road surface through the nozzle. The high-pressure water flow can effectively wash away the dust, sand and other impurities on the road surface. The sprayed water flow mixes with the impurities on the road surface. At this time, the mechanical brushes at the front or side start to rotate, further stirring and sweeping the mixture to ensure a more thorough cleaning. While the brush is sweeping, the suction nozzle is close to the ground, generating a strong suction force to suck the mixed sewage mixed with dirt, sand and garbage into the sewage tank. During the whole process, the hydraulic system and the control system work together to adjust the movement and cleaning parameters of each mechanical component to ensure a smooth and efficient washing and sweeping process. After the operation is completed, the wastewater and garbage in the clean water tank, sewage tank and garbage collection tank are centrally treated to ensure that the vehicle is in good condition before the next operation.

[0004] During the above-mentioned road cleaning process, the capacity of the clean water tank of the washing and sweeping vehicle directly affects the continuous working time of the washing and sweeping vehicle. The clean water stored in the clean water tank is sprayed onto the road surface through a high-pressure nozzle, which can quickly clean the dirt and impurities on the road surface. However, the clean water tank with limited capacity will quickly run out of clean water after working for a long time, forcing the operator to suspend the cleaning work and go to a nearby cleaning station or public water source to replenish water. Especially in large-scale cleaning tasks, frequent shutdowns for water replenishment not only reduce work efficiency, but also increase the complexity and labor intensity of operations; on the other hand, the capacity of the sewage tank limits the amount of sewage that the washing and sweeping vehicle can collect and store. During the cleaning process, once the mixed sewage sucked in by the suction nozzle fills the sewage tank, the staff will have to suspend the road cleaning work, shut down the machine to empty the sewage, and then continue to work. This process also leads to a decrease in the efficiency of road cleaning work of the washing and sweeping vehicle.

[0005] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a self-cleaning circulation system for a sewage tank of a washing and sweeping vehicle. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problem is: the self-cleaning circulation system of the sewage tank of the washing and sweeping vehicle of the present invention comprises a sewage tank; and further comprises:

[0007] A primary cleaning device is installed at the lower side wall of the sewage tank, and the primary cleaning device includes:

[0008] A connecting pipe, wherein the connecting pipe is connected to the sewage tank through a self-priming water pump, and the sewage in the sewage tank is sucked into the primary cleaning device by the action of the self-priming water pump;

[0009] A desolidification tank, wherein the desolidification tank port is connected to a connecting pipe, and a side of the desolidification tank away from the connecting pipe is connected to a water pipe;

[0010] A filter pipe, which is a horizontal long pipe with one end open and filter holes evenly opened on the side wall, and the open end of the filter pipe is connected to the water pipe orifice;

[0011] The secondary cleaning device is connected to the pipe opening at the other end of the water pipe and is used for secondary cleaning of the sewage flowing out of the water pipe.

[0012] Preferably, the secondary cleaning device comprises:

[0013] A separation tank, the top of which is connected to a downwardly extending nozzle of a water pipe, and the separation tank is divided into an upper and a lower layer by a middle partition;

[0014] The dust removal tank is a cylindrical structure with an open upper end, located inside the separation tank, the bottom of the dust removal tank is rotatably sealed and connected to the middle partition, the side wall of the dust removal tank is evenly provided with water filter holes, the bottom of the dust removal tank is fixedly connected to a dust removal motor, and the dust removal tank is directional rotated under the action of the dust removal motor;

[0015] A water outlet pipe is installed at the lower end side wall of the upper separation tank, and the water outlet pipe is connected to the clean water tank of the washing and sweeping vehicle.

[0016] Preferably, the closed end of the filter tube close to the connecting tube is arc-shaped.

[0017] Preferably, the outer diameter of the connecting pipe is the same as that of the filter and solid pipe, and the inner diameter of the connecting pipe extending into the part except the solid tank gradually increases along the water flow direction.

[0018] Preferably, an isolation block is installed on the side of the de-solidification tank close to the sewage tank. The isolation block is a hollow conical structure, which is sleeved on the outer wall of the connecting pipe extending into the de-solidification tank and is slidably connected to the outer wall of the connecting pipe. The isolation block is driven by an isolation electric cylinder fixedly connected to the outside of the de-solidification tank to perform reciprocating sliding in the horizontal direction.

[0019] Preferably, a diffuser is installed at the open area at the upper end of the dust removal tank. The diffuser consists of an inner and outer double-layer conical structure. A diffuser hole is opened at the bottom of the diffuser, and the outlet of the water pipe extending into the separation tank is located in the upper opening of the diffuser.

[0020] Preferably, the generatrixes of the inner and outer double-layer conical structures of the diffuser are both curves concave outwards.

[0021] Preferably, the inner conical part of the diffuser is connected to a diffuser motor installed on the top of the separation tank, and the diffuser performs directional rotation under the action of the diffuser motor, and the rotation direction of the diffuser is opposite to the rotation direction of the dust removal tank.

[0022] Preferably, the upper opening of the dust removal tank is larger than the horizontal cross-section of the diffuser, and a scraper rod is inserted into the gap between the dust removal tank and the diffuser. The scraper rod extends downward from the upper end of the separation tank into the dust removal tank, and a thin sheet-like scraper sheet is fixedly installed on the part of the scraper rod located in the dust removal tank. The scraper rod is connected to a scraper motor above the separation tank.

[0023] Preferably, a hollow portion communicating with the lower layer of the separation tank is provided at the bottom of the dust removal tank.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. In addition to the hollow conical isolation block installed on the outer wall of the connecting pipe in the solid tank, the self-priming water pump starts the isolation electric cylinder every time it works for a period of time, thereby driving the isolation block to slide horizontally from the outer wall of the connecting pipe to the outer wall of the filter solid pipe. Under the action of its conical structure, the solid waste attached to the outer wall of the filter solid pipe is scraped and compressed, which plays a technical effect of unblocking the filter solid pipe and cleaning its outer wall, thereby ensuring that the connecting pipe can continue to work efficiently.

[0026] 2. The silt and clean water in the mixed sewage in contact with the inner wall of the dust removal tank begin to separate under the action of strong centrifugal force: the silt is tightly attached to the inner wall of the dust removal tank under the action of centrifugal force, and the clean water passes through the water filter holes on the inner wall of the dust removal tank and enters the upper space separated by the middle partition of the separation tank, and flows into the clean water tank along the outlet pipe to replenish the clean water in the clean water tank, thereby achieving the technical effect of recycling water resources, greatly enhancing the road cleaning time of the washing and sweeping vehicle after one filling of water, avoiding the suspension of the washing and sweeping vehicle due to water resource problems, and improving the working efficiency of the washing and sweeping vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a three-dimensional structural schematic diagram of the primary cleaning device and the secondary cleaning device of the present invention;

[0030] Figure 3 It is a three-dimensional structural cross-sectional view of the primary cleaning device and the secondary cleaning device of the present invention;

[0031] Figure 4 is a three-dimensional structural cross-sectional view of the primary cleaning device of the present invention;

[0032] Figure 5 It is a three-dimensional structural sectional view of the secondary cleaning device of the present invention.

[0033] In the figure: 1. sewage tank; 2. primary cleaning device; 3. connecting pipe; 4. solid removal tank; 5. water pipe; 6. solid filter pipe; 7. secondary cleaning device; 8. separation tank; 9. middle partition; 10. dust removal tank; 11. dust removal motor; 12. water outlet pipe; 13. isolation block; 14. isolation electric cylinder; 15. liquid diffuser; 16. liquid diffusion hole; 17. liquid diffusion motor; 18. wall scraper rod; 19. wall scraper sheet; 20. wall scraper motor. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0035] like Figures 1 to 5 As shown, the embodiment of the present invention provides a self-cleaning circulation system for a sewage tank of a washing and sweeping vehicle, comprising a sewage tank 1; and further comprising:

[0036] The primary cleaning device 2 is installed at the lower side wall of the sewage tank 1, and the primary cleaning device 2 includes:

[0037] A connecting pipe 3, wherein the connecting pipe 3 is connected to the sewage tank 1 through a self-priming water pump, and the sewage in the sewage tank 1 is sucked into the primary cleaning device 2 by the action of the self-priming water pump;

[0038] A desolidification tank 4, wherein the desolidification tank 4 is connected to the connecting pipe 3, and the desolidification tank 4 is connected to a water pipe 5 at a side away from the connecting pipe 3;

[0039] The filter tube 6 is a horizontal long tube with one end open and filter holes evenly opened on the side wall. The open end of the filter tube 6 is connected to the outlet of the water pipe 5;

[0040] The secondary cleaning device 7 is connected to the other end of the water pipe 5 and is used for secondary cleaning of the sewage flowing out of the water pipe 5.

[0041] As an embodiment of the present invention, the closed end of the filter tube 6 close to the connecting tube 3 is in an arc shape.

[0042] As an embodiment of the present invention, the outer diameter of the connecting pipe 3 is the same as that of the filter and solid pipe 6, and the inner diameter of the connecting pipe 3 extending into the part except the solid tank 4 gradually increases along the water flow direction.

[0043] As an embodiment of the present invention, an isolation block 13 is installed on the side of the de-solidification tank 4 close to the sewage tank 1. The isolation block 13 is a hollow conical structure, which is sleeved on the outer wall of the connecting pipe 3 extending into the de-solidification tank 4 and is slidably connected to the outer wall of the connecting pipe 3. The isolation block 13 is driven by an isolation electric cylinder 14 fixedly connected to the outside of the de-solidification tank 4 to perform reciprocating sliding in the horizontal direction.

[0044] As the road cleaning work of the washing and sweeping vehicle continues, the sewage storage in the sewage tank 1 on the washing and sweeping vehicle is also increasing. When the sewage storage in the sewage tank 1 reaches the set water level or the clean water storage in the clean water tank is consumed to the warning water level, the self-priming water pump is started, and the sewage at the bottom of the sewage tank 1 is sucked into the connecting pipe 3 by the self-priming water pump, and then enters the interior of the primary cleaning device 2 through the connecting pipe 3; the road mixed sewage sucked by the sewage tank 1 in the process of road cleaning by the washing and sweeping vehicle has a more complex composition, including larger solid garbage such as leaves, and more solid garbage such as mud and sand. When the mixed sewage in the sewage tank 1 passes through the connecting pipe 3 and enters the desolidification tank 4 of the primary cleaning device 2, it first contacts the closed arc end of the filter tube 6 in the desolidification tank 4, and then flows to the side wall of the filter tube 6. The closed end of the filter tube 6 close to the connecting pipe 3 is designed to be an arc, so that the solid waste in the mixed sewage can move along the arc surface to the side wall of the filter tube 6, and will not be stuck at the pipe mouth of the connecting pipe 3, thereby preventing the sewage in the sewage tank 1 from effectively entering; further, the connecting pipe 3 is extended into the desolidification tank 4 The internal diameter of each filter increases gradually along the direction of water flow, thereby providing more space for large solid waste in sewage to pass through; filter holes are evenly arranged on the side wall of the filter solid pipe 6. When the mixed sewage passes through the filter holes of the filter solid pipe 6, large solid waste larger than the filter hole diameter will be blocked outside the filter solid pipe 6, while relatively fine mud and sand impurities pass through the filter solid pipe 6 together with the sewage and enter the water pipe 5 for secondary treatment in the secondary cleaning device 7; although there are few large waste objects in the mixed sewage, once the solid waste blocks the filter holes of the filter solid pipe 6, the filter solid pipe 6 The working efficiency will be greatly reduced. For this reason, in addition to the outer wall of the connecting pipe 3 in the solid tank 4, a hollow conical isolation block 13 is also installed. The self-priming water pump starts the isolation electric cylinder 14 every time it works for a period of time, thereby driving the isolation block 13 to slide horizontally from the outer wall of the connecting pipe 3 to the outer wall of the filter solid pipe 6. Under the action of its conical structure, the solid waste attached to the outer wall of the filter solid pipe 6 is scraped and compressed, which has the technical effect of unblocking the filter solid pipe 6 and cleaning its outer wall, thereby ensuring that the connecting pipe 3 can continue to work efficiently.

[0045] As an embodiment of the present invention, the secondary cleaning device 7 includes:

[0046] A separation tank 8, the top of which is connected to the downwardly extending nozzle of the water pipe 5, and the separation tank 8 is divided into two layers, an upper layer and a lower layer, by a middle partition 9;

[0047] The dust removal tank 10 is a cylindrical structure with an open upper end, and is located inside the separation tank 8. The bottom of the dust removal tank 10 is rotatably sealed and connected to the middle partition 9. The side wall of the dust removal tank 10 is evenly provided with water filtering holes. The bottom of the dust removal tank 10 is fixedly connected to a dust removal motor 11. The dust removal tank 10 is directional rotated under the action of the dust removal motor 11.

[0048] A water outlet pipe 12 is installed at the lower end side wall of the upper separation tank 8, and the water outlet pipe 12 is connected to the clean water tank of the cleaning vehicle.

[0049] As an embodiment of the present invention, a diffuser 15 is installed at the open area at the upper end of the dust removal tank 10. The diffuser 15 is composed of an inner and outer double-layer conical structure. A diffuser hole 16 is opened at the bottom of the diffuser 15, and the mouth of the water pipe 5 extending into the separation tank 8 is located in the upper opening of the diffuser 15.

[0050] As an embodiment of the present invention, the generatrix of the inner and outer double-layer conical structures of the diffuser 15 are both curves concave outwards.

[0051] As an embodiment of the present invention, the inner conical portion of the diffuser 15 is connected to a diffuser motor 17 installed at the top of the separation tank 8, and the diffuser 15 performs directional rotation under the action of the diffuser motor 17, and the rotation direction of the diffuser 15 is opposite to the rotation direction of the dust removal tank 10.

[0052] During operation, the mixed sewage from which large pieces of solid waste are removed flows into the secondary cleaning device 7 along the water pipe 5, and flows into the upper opening of the diffuser 15 together with the pipe opening of the dust removal tank 10 extending through the water pipe 5. At this time, the dust removal tank 10 has begun to rotate in a directional manner under the action of the dust removal motor 11, and the diffuser 15 also rotates in a directional manner opposite to the direction of the dust removal tank 10 under the action of the diffuser motor 17. When the sewage mixed with sediment flows into the diffuser 15, the mixed sewage will be ejected outward from the diffuser hole 16 at the bottom of the diffuser 15 under the action of the concave surface of the diffuser 15 and the centrifugal force generated by the rotation of the diffuser 15, and fly to the inner wall of the dust removal tank 10. The rotation direction of 10 is opposite to that of the diffuser 15, so that the silt and clean water in the mixed sewage in contact with the inner wall of the dust removal tank 10 begin to separate under the action of strong centrifugal force: the silt is tightly attached to the inner wall of the dust removal tank 10 under the action of centrifugal force, and the clean water passes through the water filter holes on the inner wall of the dust removal tank 10, enters the upper space separated by the middle partition 9 of the separation tank 8, and flows into the clean water tank along the outlet pipe 12 to replenish the clean water for the clean water tank, thereby achieving the technical effect of recycling water resources, greatly enhancing the road cleaning time of the washing and sweeping vehicle after one-time water filling, avoiding the suspension of the washing and sweeping vehicle due to water resource problems, and improving the working efficiency of the washing and sweeping vehicle.

[0053] As an embodiment of the present invention, the upper opening of the dust removal tank 10 is larger than the horizontal cross-section of the diffuser 15, and a scraper rod 18 is inserted into the gap between the dust removal tank 10 and the diffuser 15. The scraper rod 18 extends downward from the upper end of the separation tank 8 into the dust removal tank 10. The part of the scraper rod 18 located in the dust removal tank 10 is fixedly installed with a thin sheet-like scraper sheet 19, and the scraper rod 18 is connected to the scraper motor 20 above the separation tank 8.

[0054] As an embodiment of the present invention, a hollow portion communicating with the lower layer of the separation tank 8 is provided at the bottom of the dust removal tank 10 .

[0055] During operation, the dust removal tank 10 is in the process of continuous rotation, and the mud and sand attached to the inner wall surface will gradually accumulate, thereby reducing its working efficiency. For this reason, a scraper rod 18 extending downward from the upper end of the separation tank 8 into the dust removal tank 10 is inserted in the gap between the dust removal tank 10 and the diffuser 15. During the normal separation of sewage by the dust removal tank 10 and the diffuser 15, the scraper rod 18 remains stationary in the dust removal tank 10, so as not to affect the normal operation of the dust removal tank 10 as much as possible. When the road cleaning work of the washing and sweeping vehicle is completed, the clean water tank, sewage tank 1 and the dust removal tank 10, diffuser 15 and other components in the washing and sweeping vehicle stop working, and the scraper rod 18 is started at this time. The motor 20 causes the scraper rod 18 to rotate, and rotates the scraper piece 19 fixedly connected to the scraper rod 18 until it contacts the inner wall of the dust removal tank 10, and then the scraper motor 20 stops rotating, and the dust removal motor 11 slowly rotates the dust removal tank 10 in a low-speed mode, so that the scraper piece 19 can scrape off the mud and sand accumulated on the inner wall of the dust removal tank 10 during this road cleaning process, and pass through the hollow part at the bottom of the dust removal tank 10 and fall to the lower part of the separation tank 8 separated by the middle partition 9. After the staff drives the washing and sweeping vehicle back to the ring station, they only need to clean up the mud and sand in the lower layer of the separation tank 8 and the large pieces of solid waste in the solid removal tank 4, which greatly saves the staff's maintenance time for the washing and sweeping vehicle.

[0056] The above shows and describes the basic principles, main features and significant advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments. Without departing from the spirit and scope of the present invention, the present invention may also be modified and improved to adapt to different usage environments and customer needs. These modifications and improvements fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-cleaning circulation system for a sewage tank of a washing and sweeping vehicle, comprising a sewage tank (1); characterized in that , also includes: A primary cleaning device (2), the primary cleaning device (2) being installed on the lower side wall of the sewage tank (1), the primary cleaning device (2) comprising: A connecting pipe (3), wherein the connecting pipe (3) is connected to the sewage tank (1) through a self-priming water pump, and the sewage in the sewage tank (1) is sucked into the primary cleaning device (2) by the action of the self-priming water pump; A desolidification tank (4), the port of which is connected to the connecting pipe (3), and the side of the desolidification tank (4) away from the connecting pipe (3) is connected to a water pipe (5); A filter tube (6), wherein the filter tube (6) is a horizontal long tube with one end open and a side wall evenly provided with filter holes, and the open end of the filter tube (6) is connected to the outlet of the water pipe (5); A secondary cleaning device (7) is connected to the other end of the water pipe (5) and is used for secondary cleaning of the sewage flowing out of the water pipe (5).

2. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 1 is characterized by: The secondary cleaning device (7) comprises: A separation tank (8), wherein the top end of the separation tank (8) is connected to a pipe opening extending downward from the water pipe (5), and the separation tank (8) is divided into two layers, an upper layer and a lower layer, by a middle partition (9); A dust removal tank (10), the dust removal tank (10) is a cylindrical structure with an open upper end, located inside the separation tank (8), the bottom of the dust removal tank (10) is rotatably sealed with the middle partition (9), the side wall of the dust removal tank (10) is evenly provided with water filter holes, the bottom of the dust removal tank (10) is fixedly connected with a dust removal motor (11), and the dust removal tank (10) performs directional rotation under the action of the dust removal motor (11); A water outlet pipe (12), the water outlet pipe (12) is installed at the lower end side wall of the upper separation tank (8), and the water outlet pipe (12) is connected to the clean water tank of the cleaning vehicle.

3. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 1 is characterized by: The closed end of the filter tube (6) close to the connecting tube (3) is in an arc shape.

4. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 3 is characterized by: The outer diameter of the connecting pipe (3) is the same as the outer diameter of the filter and solidifying pipe (6), and the inner diameter of the connecting pipe (3) extending into the part except the solidifying tank (4) gradually increases along the water flow direction.

5. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 4 is characterized by: An isolation block (13) is installed on the side of the desolidification tank (4) close to the sewage tank (1). The isolation block (13) is a hollow conical structure, which is sleeved on the outer wall of the connecting pipe (3) extending into the desolidification tank (4) and is slidably connected to the outer wall of the connecting pipe (3). The isolation block (13) is driven by an isolation electric cylinder (14) fixedly connected to the outside of the desolidification tank (4) to reciprocate in the horizontal direction.

6. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 2, characterized in that: A diffuser (15) is installed at the open area at the upper end of the dust removal tank (10). The diffuser (15) is composed of an inner and outer double-layer conical structure. A diffuser hole (16) is opened at the bottom of the diffuser (15). The mouth of the water pipe (5) extending into the separation tank (8) is located in the upper opening of the diffuser (15).

7. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 6 is characterized by: The generatrix of the inner and outer double-layer conical structures of the diffuser (15) are both curves that are concave outwards.

8. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 7 is characterized by: The inner conical part of the liquid diffuser (15) is connected to a liquid diffuser motor (17) installed at the top of the separation tank (8). The liquid diffuser (15) performs directional rotation under the action of the liquid diffuser motor (17), and the rotation direction of the liquid diffuser (15) is opposite to the rotation direction of the dust removal tank (10).

9. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 8, characterized in that: The upper opening of the dust removal tank (10) is larger than the horizontal cross-section of the diffuser (15); a wall scraper rod (18) is inserted into the gap between the dust removal tank (10) and the diffuser (15); the wall scraper rod (18) extends downward from the upper end of the separation tank (8) into the dust removal tank (10); a thin sheet-shaped wall scraper sheet (19) is fixedly installed on the part of the wall scraper rod (18) located in the dust removal tank (10); and the wall scraper rod (18) is connected to a wall scraper motor (20) above the separation tank (8).

10. The self-cleaning circulation system of the sewage tank (1) of a washing and sweeping vehicle according to claim 9, characterized in that: The bottom of the dust removal tank (10) is provided with a hollow portion which is connected to the lower layer of the separation tank (8).

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