Sanitation vehicle road surface cleaning system

Abstract

The utility model provides a sanitation truck road surface cleaning system which comprises a hydraulic system and a cleaning mechanism, and a plurality of anti-collision wheels are transversely and rotationally arranged on the two side walls of the cleaning mechanism respectively. The hydraulic system includes: an oil source; the reversing valve is connected with the oil source; the transverse moving oil cylinder is arranged on the sanitation vehicle and comprises a first oil cavity and a second oil cavity which are connected with the reversing valve through a two-way hydraulic control one-way valve, and a driving part for driving the cleaning mechanism to transversely move under the pushing of the oil pressure of the first oil cavity or the second oil cavity; and the two overflow valves are respectively connected with the first oil cavity and the oil source and the second oil cavity and the oil source. Therefore, when the cleaning mechanism avoids an obstacle through the anti-collision wheel, the oil pressure in the first oil cavity or the second oil cavity is adjusted through the overflow valve, interference between the oil pressure thrust and the thrust of the anti-collision wheel is avoided, and automatic avoidance of the anti-collision wheel is achieved. And oil pressure thrust is ensured to enable the cleaning mechanism to move forwards to clean the road surface by clinging to the road edge and an obstacle through the anti-collision wheel, so that the cleaning effect of the cleaning mechanism on the road edge side is improved.

Description

Technical Field

[0001] The utility model relates to the field of road surface cleaning systems for sanitation vehicles, in particular to a road surface cleaning system for sanitation vehicles. Background Art

[0002] The sanitation vehicle can clean and sprinkle water on the road surface through cleaning mechanisms such as a suction nozzle mechanism, a sweeping disc mechanism, and a water spray mechanism.

[0003] In the actual process of cleaning the road surface, garbage often accumulates on the curb side. In order to clean the road surface on the curb side, the existing cleaning mechanism uses a lateral movement mechanism equipped with a cylinder to drive the cleaning mechanism to move horizontally to completely clean the road surface on the curb side, so as to avoid garbage, dust and the like remaining on the curb side of the road surface, resulting in poor cleaning effect; however, the curb is not completely flat. When there is an obstacle on the side wall of the curb, the cleaning mechanism cannot retract for automatic avoidance under the extension limit of the cylinder, and the gap between the suction nozzle and the corner of the roadside cannot be adjusted, resulting in interference between the cleaning mechanism and the obstacle, and even damage after collision, which greatly reduces the service life of the cleaning mechanism.

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to design a road cleaning system for sanitation vehicles that can automatically avoid roadside obstacles. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a road surface cleaning system for a sanitation vehicle, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A road cleaning system for a sanitation vehicle comprises: a hydraulic system and a cleaning mechanism, wherein two side walls of the cleaning mechanism are respectively provided with a plurality of anti-collision wheels for transverse rotation; the hydraulic system comprises:

[0008] Oil source;

[0009] a reversing valve connected to the oil source;

[0010] A transverse oil cylinder is provided on the sanitation vehicle, and the transverse oil cylinder comprises a first oil chamber and a second oil chamber connected to the reversing valve through a two-way hydraulically controlled one-way valve, and a driving part that drives the cleaning mechanism to move transversely under the oil pressure of the first oil chamber or the second oil chamber;

[0011] Two overflow valves are respectively connected to the first oil chamber and the oil source, and the second oil chamber and the oil source; the reversing valve controls the oil inlet of the first oil chamber or the second oil chamber to push the driving part to drive the cleaning mechanism to move laterally to one side to fit the curb with an obstacle. When the anti-collision wheels on one side cross the obstacle, they push the cleaning mechanism to move laterally to the other side to drive the driving part to compress the first oil chamber or the second oil chamber, and the excess oil in the first oil chamber or the second oil chamber flows back to the oil source through the corresponding overflow valve.

[0012] Furthermore, it also includes a lifting frame that is driven by the lifting cylinder on the sanitation vehicle to lift up and down, and a transverse frame that is laterally slidably connected to the lifting frame. The cleaning mechanism is linked to the transverse frame. The transverse cylinder is arranged on the inner side of the lifting frame. The transverse cylinder also includes a connecting rod with a piston fixed in the middle. The driving part is a cylinder body that is fixedly connected to the transverse frame and transversely sleeved on the outer side of the piston. The piston divides the cylinder body into the first oil chamber and the second oil chamber. The two ends of the connecting rod respectively penetrate the first oil chamber and the second oil chamber and are rotatably connected to the inner side of the lifting frame. When the cleaning mechanism is pushed by the several anti-collision wheels on one side to move laterally toward the other side, it drives the cylinder body to move laterally to compress the first oil chamber or the second oil chamber.

[0013] Furthermore, first sensing devices are respectively provided on both sides of the lifting frame, and second sensing devices corresponding to the first sensing devices are respectively provided on both sides of the top of the cleaning mechanism. When the cleaning mechanism moves horizontally toward one side to the other side and the first sensing device and the second sensing device are sensed, the reversing valve controls the first oil chamber or the second oil chamber to stop filling with oil, and the cylinder body stops driving the cleaning mechanism to move horizontally. When the cleaning mechanism is pushed by the several anti-collision wheels on one side to the other side and the first sensing device and the second sensing device on the other side are no longer sensed, the reversing valve controls the first oil chamber or the second oil chamber to fill with oil, and excess oil in the first oil chamber or the second oil chamber flows back to the oil source through the corresponding overflow valve.

[0014] Further, the reversing valve includes an oil port P and an oil port T respectively connected to an oil source, and an oil port A and an oil port B respectively connected to the first oil chamber and the second oil chamber. When the reversing valve is located at a left shift position, the oil port P and the oil port A are connected, and the oil port T and the oil port B are connected. Oil entering the first oil chamber drives the cleaning mechanism to move left. When the reversing valve is located at a right shift position, the oil port P and the oil port B are connected, and the oil port T and the oil port A are connected. Oil entering the second oil chamber drives the cleaning mechanism to move right. When the reversing valve is located at an intermediate position, the oil port P, the oil port T, the oil port A, and the oil port B are connected. The first oil chamber and the second oil chamber stop entering oil and stop driving the cleaning mechanism to move horizontally.

[0015] Furthermore, a gear pump is provided between the oil source and the oil port P, and a superimposed one-way throttle valve is connected between the first oil chamber, the second oil chamber and the two-way hydraulically controlled one-way valve.

[0016] Furthermore, the cleaning mechanism is configured as a suction nozzle device, which includes a suction nozzle shell whose top is connected to the transverse frame and whose bottom is opened to form a suction chamber, and a plurality of suction cylinders for connecting the suction chamber and the suction device of the sanitation vehicle are provided on the top of the suction nozzle shell, and the two second sensing devices are provided on the left and right sides of the top of the suction nozzle shell, and a plurality of support frames are respectively fixed side by side on the front and rear tops of the suction nozzle shell, and a plurality of the support frames are respectively rotatably provided with universal wheels at the bottom away from one end of the suction nozzle shell, and when the plurality of the universal wheels contact the ground, a gap is set between the bottom of the suction nozzle shell and the ground.

[0017] Therefore, the utility model provides the following effects and / or advantages:

[0018] 1. The present application controls the oil inlet of the first oil chamber or the second oil chamber through the reversing valve to push the driving part to drive the cleaning mechanism to move horizontally to one side to fit the curb. When there is an obstacle on the side wall of the curb, the obstacle can be crossed by several anti-collision wheels on one side. In this process, several anti-collision wheels on one side will push the cleaning mechanism to move horizontally to the other side to drive the driving part to compress the first oil chamber or the second oil chamber. Through the setting of the overflow valve, the excess oil in the first oil chamber or the second oil chamber flows back to the oil source through the corresponding overflow valve, thereby adjusting the oil pressure in the first oil chamber or the second oil chamber to avoid interference between the oil pressure thrust and the anti-collision wheel thrust, so that the automatic avoidance of the anti-collision wheel can be realized, and it is ensured that the oil pressure thrust can enable the cleaning mechanism to move forward to clean the road surface by the anti-collision wheel close to the curb and obstacles, thereby improving the cleaning effect of the cleaning mechanism on the curb side.

[0019] 2. In the present application, when the cleaning mechanism moves horizontally to one side and senses the first sensing device and the second sensing device on the other side, the reversing valve controls the first oil chamber or the second oil chamber to stop the oil supply, and the cylinder stops driving the cleaning mechanism to move horizontally, so that the cleaning mechanism can automatically move horizontally to the leftmost or rightmost standard position, avoiding excessive horizontal movement of the cleaning mechanism and collision with the curb, thereby extending its service life;

[0020] When the cleaning mechanism is in the leftmost or rightmost standard working position, when the cleaning mechanism is pushed by several anti-collision wheels on one side to move horizontally toward the other side until the first sensing device and the second sensing device on the other side are no longer inductively coupled, the reversing valve controls the oil intake of the first oil chamber or the second oil chamber, and the excess oil in the first oil chamber or the second oil chamber flows back to the oil source through the corresponding overflow valve. Therefore, when the cleaning mechanism is in the leftmost or rightmost standard working position and the first oil chamber and the second oil chamber do not take in oil, the anti-collision wheel crosses the most protruding point of the obstacle, the first oil chamber or the second oil chamber is compressed and the excess oil flows back to the oil source through the overflow valve, and then the first oil chamber or the second oil chamber is replenished with oil, ensuring that the oil pressure thrust in the first oil chamber or the second oil chamber after the cleaning mechanism crosses the most protruding point of the obstacle through the anti-collision wheel can enable the cleaning mechanism to clean the road surface by closely adhering to the obstacle and the curb through the anti-collision wheel, thereby improving the cleaning effect of the cleaning mechanism on the curb side.

[0021] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the cleaning mechanism, lifting frame and transverse frame provided by the utility model.

[0023] Figure 2 This is a schematic structural diagram of the lifting frame and the transverse moving frame provided by the utility model.

[0024] Figure 3 This is a structural schematic diagram of the hydraulic system provided by the utility model, in which the reversing valve is located at the left shift position.

[0025] Figure 4 This is a structural schematic diagram of the hydraulic system provided by the utility model, in which the reversing valve is located at the middle position.

[0026] Figure 5 This is a structural schematic diagram of the hydraulic system provided by the utility model, in which the reversing valve is located at the right shift position. DETAILED DESCRIPTION

[0027] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0028] refer to Figure 1-5 A road cleaning system for a sanitation vehicle comprises: a hydraulic system 1 and a cleaning mechanism 2, wherein a plurality of anti-collision wheels 21 are respectively arranged on the two side walls of the cleaning mechanism 2 for transverse rotation; the hydraulic system 1 comprises:

[0029] Oil source 11;

[0030] A reversing valve 12 connected to the oil source 11;

[0031] The lateral oil cylinder 13 is provided on the sanitation vehicle, and the lateral oil cylinder 13 includes a first oil chamber 131 and a second oil chamber 132 connected to the reversing valve 12 through a two-way hydraulically controlled one-way valve 17, and a driving part 133 that drives the cleaning mechanism 2 to move horizontally under the oil pressure of the first oil chamber 131 or the second oil chamber 132; specifically, in this embodiment, the lateral oil cylinder 13 is set as a double-rod oil cylinder, and in other embodiments, the lateral oil cylinder 13 can also be set as other existing types of oil cylinders;

[0032] The two overflow valves 14 are respectively connected to the first oil chamber 131 and the oil source 11, and the second oil chamber 132 and the oil source 11. By reasonably setting the overflow valves 14, when the oil amount in the first oil chamber 131 and the second oil chamber 132 is higher than the set value, the overflow valves 14 are automatically turned on to release the excess oil; the reversing valve 12 controls the first oil chamber 131 or the second oil chamber 132 to enter the oil chamber to push the driving part 133 to drive the cleaning mechanism 2 to move horizontally to one side to fit the curb. When there is an obstacle on the side wall of the curb, the obstacle can be crossed by the several anti-collision wheels 21 on one side. In this process, the several anti-collision wheels 21 on one side will push The cleaning mechanism 2 moves laterally toward the other side to drive the driving part 133 to compress the first oil chamber 131 or the second oil chamber 132. By setting the overflow valve 14, the excess oil in the first oil chamber 131 or the second oil chamber 132 flows back to the oil source 11 through the corresponding overflow valve 14, thereby adjusting the oil pressure in the first oil chamber 131 or the second oil chamber 132 to avoid interference between the oil pressure thrust and the thrust of the anti-collision wheel 21, so that the automatic avoidance of the anti-collision wheel 21 can be achieved, and it can be ensured that the oil pressure thrust can enable the cleaning mechanism 2 to move forward close to the curb and obstacles through the anti-collision wheel 21 to clean the road surface, thereby improving the cleaning effect of the cleaning mechanism 2 on the curb side.

[0033] In order to improve the stability of the cooperation between the transverse oil cylinder 13 and the cleaning mechanism 2, it also includes a lifting frame 3 driven by the lifting cylinder on the sanitation vehicle to lift up and down, and a transverse frame 4 connected to the lifting frame 3 in a transverse sliding manner. The cleaning mechanism 2 and the transverse frame 4 are arranged in a linkage manner. Specifically, the lifting frame 3 and the transverse frame 4 can be slidably arranged through a slide rail and a slider, and the cleaning mechanism 2 and the transverse frame 4 can be screwed. The transverse oil cylinder 13 is arranged on the inner side of the lifting frame 3, and the transverse oil cylinder 13 also includes a connecting rod 135 with a piston 134 fixed in the middle. The driving part 133 is connected to the transverse frame 4. A cylinder body is fixedly connected and laterally sleeved on the outer side of the piston 134, and the piston 134 divides the cylinder body into the first oil chamber 131 and the second oil chamber 132, so that the cylinder body is pushed by the oil entering the first oil chamber 131 or the second oil chamber 132 to drive the cleaning mechanism 2 to move laterally. The two ends of the connecting rod 135 respectively penetrate the first oil chamber 131 and the second oil chamber 132 and are rotatably connected to the inner side of the lifting frame 3. When the cleaning mechanism 2 is pushed by the several anti-collision wheels 21 on one side to move laterally toward the other side, it drives the cylinder body to move laterally and compress the first oil chamber 131 or the second oil chamber 132.

[0034] In order to improve the stability of the cleaning mechanism 2 during operation, first sensing devices 31 are respectively provided on both sides of the lifting frame 3, and second sensing devices 22 corresponding to the first sensing devices 31 are respectively provided on both sides of the top of the cleaning mechanism 2. Specifically, the first sensing devices 31 and the second sensing devices 22 are arranged in a left-right distribution, the second sensing device 22 is set as a sensing plate, and the first sensing device 31 is set as a proximity switch for sensing the sensing plate. When the cleaning mechanism 2 moves horizontally from one side to the other side and the first sensing device 31 and the second sensing device 22 sense each other, the reversing valve 12 controls the first oil chamber 131 or the second oil chamber 132 to stop filling with oil, and the cylinder body stops driving the cleaning mechanism 2 to move horizontally, so that the cleaning mechanism 2 can automatically move horizontally to the leftmost or rightmost standard position, avoiding excessive horizontal movement of the cleaning mechanism 2 and collision with the curb, thereby extending its service life. When the cleaning mechanism 2 is at the leftmost or rightmost standard position and the first oil chamber 131 and the second oil chamber 132 do not fill with oil, the anti-collision wheel 21 crosses the most protruding point of the obstacle, and the first oil chamber 131 or the second oil chamber 1 After the first oil chamber 131 or the second oil chamber 132 is compressed and the excess oil flows back to the oil source 11 through the overflow valve 14, there is no sufficient oil pressure in the first oil chamber 131 or the second oil chamber 132 to push the cleaning mechanism 2 to move horizontally and close to the obstacle and the curb. When the cleaning mechanism 2 is pushed by the plurality of anti-collision wheels 21 on one side to move horizontally to the other side until the first sensing device 31 and the second sensing device 22 on the other side are not sensing each other, the reversing valve 12 controls the first oil chamber 131 or the second oil chamber 132 to flow oil, and the excess oil in the first oil chamber 131 or the second oil chamber 132 flows back to the oil source 11 through the reversing valve 12. The corresponding overflow valve 14 returns to the oil source 11, so that the first oil chamber 131 or the second oil chamber 132 is replenished with oil after being compressed, ensuring that the cleaning mechanism 2 crosses the most protruding point of the obstacle through the anti-collision wheel 21. After the first oil chamber 131 or the second oil chamber 132 is compressed and the excess oil returns to the oil source 11 through the overflow valve 14, it is ensured that the oil pressure thrust in the first oil chamber 131 or the second oil chamber 132 can enable the cleaning mechanism 2 to clean the road surface by closely adhering to the obstacles and curbs through the anti-collision wheel 21, thereby improving the cleaning effect of the cleaning mechanism 2 on the curb side.

[0035] In order to improve the flexibility of the cleaning mechanism 2 to drive the driving part 133 to move laterally when the anti-collision wheel 21 is pushed by the cleaning mechanism 2 when the cleaning mechanism 2 is working in the leftmost or rightmost standard position and during the obstacle avoidance process of the anti-collision wheel 21, the reversing valve 12 includes an oil port P and an oil port T respectively connected to the oil source 11, and an oil port A and an oil port B respectively connected to the first oil chamber 131 and the second oil chamber 132. When the reversing valve 12 is located at the left shift position, the oil port P is connected to the oil port A, and the oil port T is connected to the oil port B. The first oil chamber 131 is filled with oil to drive the cleaning mechanism 2 to move left. When the reversing valve 12 is located at the right shift position, the oil port P is connected to the oil port B, and the oil port T is connected to the oil port A. The second oil chamber 131 is connected to the oil port B. 32 oil intake drives the cleaning mechanism 2 to move right. When the reversing valve 12 is located in the middle position, the oil port P, oil port T, oil port A, and oil port B are connected. The first oil chamber 131 and the second oil chamber 132 stop taking in oil and stop driving the cleaning mechanism 2 to move horizontally. That is, when the cleaning mechanism 2 is working in the leftmost or rightmost standard position, the reversing valve 12 is located in the middle position. Specifically, the middle position of the reversing valve 12 is set to H type. At this time, the oil pressure in the hydraulic system 1 is zero, and the first oil chamber 131 and the second oil chamber 132 are connected, so that the driving part 133 can easily move horizontally to the left and right under the push of external force. Therefore, the flexibility of the cleaning mechanism 2 to drive the driving part 133 to move horizontally after being pushed by the anti-collision wheel 21 is improved.

[0036] In order to improve the stability of the output of the oil source 11 and control the flow rate of oil entering the first oil chamber 131 and the second oil chamber 132, a gear pump 15 is provided between the oil source 11 and the oil port P, and a superimposed one-way throttle valve 16 is connected between the first oil chamber 131 and the second oil chamber 132 and the two-way hydraulically controlled one-way valve 17.

[0037] Specifically, in the present embodiment, the cleaning mechanism 2 is configured as a suction nozzle device. In other embodiments, the suction nozzle device may also be configured as other existing sweeping disc mechanisms, water spraying mechanisms and the like. The suction nozzle device comprises a suction nozzle shell 23 whose top is connected to the transverse frame 4 and whose bottom is opened to form a suction chamber. The top of the suction nozzle shell 23 is provided with a plurality of suction cylinders 24 for connecting the suction chamber and the suction device of the sanitation vehicle. The two second sensing devices 22 are arranged on the left and right sides of the top of the suction nozzle shell 23. The front and rear tops of the suction nozzle shell 23 are respectively fixed with a plurality of support frames 25 arranged side by side. The bottoms of the plurality of support frames 25 away from one end of the suction nozzle shell 23 are respectively rotatably provided with universal wheels 26. When the plurality of universal wheels 26 contact the ground, a gap is set between the bottom of the suction nozzle shell 23 and the ground.

[0038] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A road cleaning system for a sanitation vehicle, characterized in that: include: A hydraulic system (1) and a cleaning mechanism (2), wherein two side walls of the cleaning mechanism (2) are provided with a plurality of anti-collision wheels (21) for transverse rotation; the hydraulic system (1) comprises: Oil source (11); A reversing valve (12) connected to the oil source (11); A transverse oil cylinder (13) is provided on the sanitation vehicle, the transverse oil cylinder (13) comprising a first oil chamber (131) and a second oil chamber (132) connected to the reversing valve (12) via a two-way hydraulically controlled one-way valve (17), and a driving part (133) for driving the cleaning mechanism (2) to transversely move under the oil pressure of the first oil chamber (131) or the second oil chamber (132); Two overflow valves (14) are respectively connected to the first oil chamber (131) and the oil source (11), and the second oil chamber (132) and the oil source (11); the reversing valve (12) controls the oil inlet of the first oil chamber (131) or the second oil chamber (132) to push the driving part (133) to drive the cleaning mechanism (2) to move laterally to one side to fit the road edge with an obstacle, and when the plurality of anti-collision wheels (21) on one side cross the obstacle, they push the cleaning mechanism (2) to move laterally to the other side to drive the driving part (133) to compress the first oil chamber (131) or the second oil chamber (132), and the excess oil in the first oil chamber (131) or the second oil chamber (132) flows back to the oil source (11) through the corresponding overflow valve (14).

2. A road cleaning system for sanitation vehicles as claimed in claim 1, characterized in that: The cleaning mechanism (2) is linked to the transverse moving frame (4). The transverse moving cylinder (13) is arranged on the inner side of the lifting frame (3). The transverse moving cylinder (13) also includes a connecting rod (135) with a piston (134) fixed in the middle. The driving part (133) is fixedly connected to the transverse moving frame (4) and is transversely sleeved on the piston (134). 34), the piston (134) divides the cylinder into the first oil chamber (131) and the second oil chamber (132), the two ends of the connecting rod (135) respectively penetrate the first oil chamber (131) and the second oil chamber (132) and are rotatably connected to the inner side of the lifting frame (3), and the cleaning mechanism (2) is pushed by the plurality of anti-collision wheels (21) on one side to move laterally toward the other side, thereby driving the cylinder to move laterally and compress the first oil chamber (131) or the second oil chamber (132).

3. A road cleaning system for sanitation vehicles as claimed in claim 2, characterized in that: First sensing devices (31) are respectively provided on both sides of the lifting frame (3), and second sensing devices (22) corresponding to the first sensing devices (31) are respectively provided on both sides of the top of the cleaning mechanism (2). When the cleaning mechanism (2) moves horizontally toward one side until the first sensing device (31) and the second sensing device (22) on the other side sense each other, the reversing valve (12) controls the first oil chamber (131) or the second oil chamber (132) to stop the oil supply, and the cylinder body stops driving the cleaning mechanism (2) to move horizontally. When the cleaning mechanism (2) is pushed by a plurality of the anti-collision wheels (21) on one side to move horizontally toward the other side until the first sensing device (31) and the second sensing device (22) on the other side do not sense each other, the reversing valve (12) controls the first oil chamber (131) or the second oil chamber (132) to supply oil, and the excess oil in the first oil chamber (131) or the second oil chamber (132) flows back to the oil source (11) through the corresponding overflow valve (14).

4. A road cleaning system for sanitation vehicles as claimed in claim 3, characterized in that: The reversing valve (12) comprises an oil port P and an oil port T respectively connected to the oil source (11), and an oil port A and an oil port B respectively connected to the first oil chamber (131) and the second oil chamber (132). When the reversing valve (12) is located at the left shift position, the oil port P is connected to the oil port A, and the oil port T is connected to the oil port B. The first oil chamber (131) is filled with oil to drive the cleaning mechanism (2) to move leftward. When the reversing valve (12) is located at the right shift position, the oil port P is connected to the oil port B, and the oil port T is connected to the oil port A. The second oil chamber (132) is filled with oil to drive the cleaning mechanism (2) to move rightward. When the reversing valve (12) is located at the middle position, the oil port P, the oil port T, the oil port A, and the oil port B are connected. The first oil chamber (131) and the second oil chamber (132) stop filling with oil and stop driving the cleaning mechanism (2) to move horizontally.

5. A road cleaning system for sanitation vehicles as claimed in claim 4, characterized in that: A gear pump (15) is provided between the oil source (11) and the oil port P, and a superimposed one-way throttle valve (16) is connected between the first oil chamber (131) and the second oil chamber (132) and the two-way hydraulically controlled one-way valve (17).

6. A road cleaning system for sanitation vehicles as claimed in claim 3, characterized in that: The cleaning mechanism (2) is configured as a suction nozzle device, and the suction nozzle device comprises a suction nozzle shell (23) whose top is connected to the transverse frame (4) and whose bottom is open to form a suction chamber. The top of the suction nozzle shell (23) is provided with a plurality of suction cylinders (24) for connecting the suction chamber and the suction device of the sanitation vehicle. The two second sensing devices (22) are arranged on the left and right sides of the top of the suction nozzle shell (23). The front and rear tops of the suction nozzle shell (23) are respectively fixedly provided with a plurality of support frames (25) in parallel. The bottoms of the plurality of support frames (25) away from one end of the suction nozzle shell (23) are respectively rotatably provided with universal wheels (26). When the plurality of universal wheels (26) are in contact with the ground, a gap is set between the bottom of the suction nozzle shell (23) and the ground.

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