High-low pressure urban road cleaning watering cart

Abstract

The invention provides a high-low pressure urban road cleaning watering cart. The high-low pressure urban road cleaning watering cart comprises a cart body, a cleaning frame, a first spraying pipe, a second spraying pipe, a converter, a high-pressure pump and a low-pressure pump. According to the high-low pressure urban road cleaning watering cart, the converter is installed between the first spraying pipe and the second spraying pipe and comprises the high-pressure pipe, the low-pressure pipe and the control valve, and the two ends of the control valve communicate between the high-pressure pipe and the low-pressure pipe. When the control valve is in an open state and the high-pressure pump or the low-pressure pump operates independently, a high-pressure water source or a low-pressure water source can flow through the first spraying pipe and the second spraying pipe at the same time. When low pressure is needed on the left side and high pressure is needed on the right side, the control valve can be closed, the high-pressure pump and the low-pressure pump are opened at the same time, a low-pressure water source flows through the first spraying pipe, a high-pressure water source flows through the second spraying pipe, the water pressure can be adjusted according to different conditions on site, and the road cleaning device is suitable for road cleaning in different working condition environments.

Description

Technical Field

[0001] This invention belongs to the field of road cleaning technology, specifically relating to a high- and low-pressure urban road cleaning and watering truck. Background Technology

[0002] The cleaning and maintenance of urban roads is a crucial aspect of maintaining the city's appearance and ensuring traffic safety. Currently, most road cleaning and watering trucks on the market operate using fixed or high-low pressure switching systems. Their typical working mode involves using side sprays to wash and suppress dust on the road surface with a relatively constant medium-low pressure water flow.

[0003] However, current road cleaning operations are diverse. For example, cleaning the road shoulder is more difficult than cleaning the middle of the road. Low-pressure cleaning cannot effectively clean the road shoulder, while high-pressure cleaning increases the water flow on both sides of the cleaning truck, resulting in water waste. Therefore, it is necessary to develop a cleaning truck capable of diversified operations to adapt to different working conditions. Summary of the Invention

[0004] This invention provides a high- and low-pressure urban road cleaning and watering truck, which aims to solve the problem that existing cleaning trucks have a single flushing pressure adjustment mode that cannot be adjusted arbitrarily according to different working conditions.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a high and low pressure urban road cleaning and watering truck, comprising: Vehicle body; A cleaning rack is installed on the front side of the vehicle body. A first spray pipe is installed on the left side of the cleaning rack, and a second spray pipe is installed on the right side of the cleaning rack. The converter includes a high-pressure pipe and a low-pressure pipe, and a control valve connecting the middle of the high-pressure pipe and the middle of the low-pressure pipe. The outlet of the low-pressure pipe is connected to the first spray pipe, and the outlet of the high-pressure pipe is connected to the second spray pipe. The high-pressure pump has its outlet end connected to the inlet end of the high-pressure pipe; The low-pressure pump and the high-pressure pump are both installed on the vehicle body, and the outlet of the low-pressure pump is connected to the low-pressure pipe.

[0006] In one possible implementation, a transmission box is further provided between the high-pressure pump and the low-pressure pump. An input shaft, a first output shaft, and a second output shaft are rotatably mounted on the transmission box. The first output shaft is driven by the drive shaft of the high-pressure pump, and the second output shaft is driven by the drive shaft of the low-pressure pump. The transmission box is also provided with a switching component for changing the transmission state between the input shaft and the first and second output shafts.

[0007] In one possible implementation, the switching component includes: A first gear is rotatably mounted on the input shaft, and a second gear that meshes with the first gear is fixedly mounted on the first output shaft. The first splined shaft is fixedly installed on one side of the first gear; A first spline sleeve is mounted on the input shaft. The position of the first spline sleeve on the input shaft has a degree of freedom that can be adjusted along the axis of the input shaft, and the first spline sleeve can slide to the outside of the first spline shaft and engage with the first spline shaft.

[0008] In one possible implementation, the switching component further includes: The third gear is rotatably mounted on the input shaft, and the fourth gear, which meshes with the first gear, is fixedly mounted on the second output shaft. The second splined shaft is fixedly installed on one side of the third gear; A second spline sleeve is mounted on the input shaft. The position of the second spline sleeve on the input shaft has a degree of freedom to be adjusted along the axis of the input shaft, and the second spline sleeve can slide to the outside of the second spline shaft and engage with the second spline shaft.

[0009] In one possible implementation, the first spline sleeve and the second spline sleeve are respectively located between the first gear and the third gear, and a push assembly for pushing the first spline sleeve and the second spline sleeve to move on the input shaft is installed inside the transmission box.

[0010] In one possible implementation, the pushing component includes: A first sliding sleeve is connected to the first spline sleeve, and a first lever is installed on the first sliding sleeve; A piston shaft is slidably mounted on the transmission box along the axial direction of the input shaft. The transmission box is provided with a piston hole for mounting the piston shaft. A first vent hole and a second vent hole are connected in the piston hole. The first vent hole and the second vent hole are respectively located on the outer sides of both ends of the piston shaft.

[0011] In one possible implementation, a piston sleeve is slidably disposed on the outer side of the piston shaft, and a second lever is fixedly mounted on the piston sleeve. The bottom end of the second lever is connected to a second sliding sleeve that is connected to the second spline sleeve.

[0012] In one possible implementation, a control valve for controlling the communication state between the piston hole and the outside is also installed in the middle of the piston hole. The control valve is located in the middle of the piston shaft and on the outside of one end of the piston sleeve. A vent hole communicating with the other end of the piston sleeve is provided on the piston shaft.

[0013] In one possible implementation, both ends of the piston shaft are provided with elastic elements that abut against the ends of the piston shaft and the transmission box.

[0014] In one possible implementation, the cleaning rack includes a main frame mounted on the vehicle body, the main frame having a degree of freedom to adjust its position on the vehicle body along a horizontal angle, a sub-frame mounted on the main frame, the sub-frame having a degree of freedom to adjust its position on the vehicle body along a pitch angle, the first spray pipe and the second spray pipe being mounted on the sub-frame, and the positions of the first spray pipe and the second spray pipe on the sub-frame having a degree of freedom to adjust their positions along a horizontal angle.

[0015] The solution shown in this application, compared with the prior art, involves installing a cleaning frame at the front of the water truck body. With the truck's front facing forward, a first spray pipe is installed on the left side of the cleaning frame, and a second spray pipe is installed on the right side. The first spray pipe is connected to a low-pressure pipe, and the second spray pipe is connected to a high-pressure pipe. A high-pressure pump delivers high-pressure water to the high-pressure pipe, and a low-pressure pump delivers low-pressure water to the low-pressure pipe. A control valve is connected between the high-pressure and low-pressure pipes. When the control valve is open, either the high-pressure or low-pressure pump can operate independently, allowing both the first and second spray pipes to simultaneously receive either high-pressure or low-pressure water. When a single-sided low-pressure (left side) and high-pressure (right side) solution is required, the control valve can be closed, and both the high-pressure and low-pressure pumps can be opened simultaneously. This allows the first spray pipe to receive low-pressure water, while the second spray pipe receives high-pressure water, enabling pressure adjustment based on different site conditions and making it suitable for road cleaning under various working conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection structure of the converter provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure between the high-pressure pump and the low-pressure pump provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the cleaning rack provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection structure between the input shaft and the first output shaft and the second output shaft provided in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of part A in the middle; Figure 6 A schematic diagram of the piston shaft mounting structure provided in an embodiment of the present invention; Figure 7 for Figure 6 A magnified view of part B in the middle.

[0017] Explanation of reference numerals in the attached figures: 1. Cleaning frame; 11. First spray pipe; 12. Second spray pipe; 13. Main frame; 14. Sub-frame; 2. Converter; 21. High-pressure pipe; 22. Low-pressure pipe; 23. Control valve; 3. High-pressure pump; 4. Low-pressure pump; 5. Transmission box; 51. Input shaft; 52. First vent; 53. Second vent; 54. Control valve; 6. First output shaft; 61. First gear; 611. Second gear; 62. First splined shaft; 63. First splined sleeve; 64. First sliding sleeve; 65. First lever; 7. Second output shaft; 71. Third gear; 711. Fourth gear; 72. Second splined shaft; 73. Second splined sleeve; 74. Second sliding sleeve; 75. Second lever; 8. Piston shaft; 81. Piston sleeve; 82. Elastic element. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] Please refer to the following: Figures 1 to 7 The high-low pressure urban road cleaning and watering truck provided by the present invention will now be described. The high-low pressure urban road cleaning and watering truck includes a vehicle body, a cleaning frame 1, a converter 2, a high-pressure pump 3, and a low-pressure pump 4. The cleaning frame 1 is installed on the front side of the vehicle body. A first spray pipe 11 is installed on the left side of the cleaning frame 1, and a second spray pipe 12 is installed on the right side of the cleaning frame 1. The converter 2 includes a high-pressure pipe 21 and a low-pressure pipe 22, and a control valve 23 connecting the middle of the high-pressure pipe 21 and the middle of the low-pressure pipe 22. The outlet of the low-pressure pipe 22 is connected to the first spray pipe 11, and the outlet of the high-pressure pipe 21 is connected to the second spray pipe 12. The outlet of the high-pressure pump 3 is connected to the inlet of the high-pressure pipe 21. Both the low-pressure pump 4 and the high-pressure pump 3 are installed on the vehicle body, and the outlet of the low-pressure pump 4 is connected to the low-pressure pipe 22.

[0020] The high- and low-pressure urban road cleaning sprinkler truck provided in this embodiment, compared with the prior art, has a cleaning frame 1 installed at the front of the sprinkler truck body. With the truck's front facing forward, a first spray pipe 11 is installed on the left side of the cleaning frame 1, and a second spray pipe 12 is installed on the right side of the cleaning frame 1. The first spray pipe 11 is connected to a low-pressure pipe 22, and the second spray pipe 12 is connected to a high-pressure pipe 21. A high-pressure pump 3 can deliver high-pressure water to the high-pressure pipe 21, and a low-pressure pump 4 can deliver low-pressure water to the low-pressure pipe 22. A control valve 23 is connected between the high-pressure pipe 21 and the low-pressure pipe 22. When the control valve 23 is open, the high-pressure pump 3 or the low-pressure pump 4 can operate independently, allowing the first spray pipe 11 and the second spray pipe 12 to simultaneously receive either high-pressure or low-pressure water. When a single-sided low-pressure water supply is required on the left and high-pressure water supply on the right, the control valve 23 can be closed, and the high-pressure pump 3 and the low-pressure pump 4 can be opened simultaneously. This allows the first spray pipe 11 to flow with low-pressure water, while the second spray pipe 12 flows with high-pressure water. The water pressure can be adjusted according to different site conditions, making it suitable for road cleaning under different working conditions.

[0021] Specifically, in this embodiment, one-way valves are provided in the inlet pipes of both the high-pressure pipe 21 and the low-pressure pipe 22 to prevent backflow of water.

[0022] In some embodiments, the high-pressure pump 3 and the low-pressure pump 4 described above can be employed as follows: Figure 2 , Figure 4 The structure shown. See also... Figure 2 , Figure 4 A transmission box 5 is also provided between the high-pressure pump 3 and the low-pressure pump 4. An input shaft 51, a first output shaft 6, and a second output shaft 7 are rotatably mounted on the transmission box 5. The first output shaft 6 is driven by the drive shaft of the high-pressure pump 3, and the second output shaft 7 is driven by the drive shaft of the low-pressure pump 4. The transmission box 5 also contains a switching component for changing the transmission state between the input shaft 51 and the first and second output shafts 6 and 7. The transmission box 5 is installed in the middle of the vehicle body, and the high-pressure pump 3 and the low-pressure pump 4 are fixedly connected to both sides of the transmission box 5. An input shaft 51 is provided on one side of the transmission box 5, and the input shaft 51 is connected to the drive shaft of the sprinkler truck. Adjusting the transmission connection between the input shaft 51 and the first output shaft 6 drives the high-pressure pump 3 to rotate, and adjusting the transmission connection between the input shaft 51 and the second output shaft 7 drives the low-pressure pump 4 to rotate.

[0023] Specifically, in this embodiment, the low-pressure pump 4 and high-pressure pump 3 on a conventional cleaning vehicle require two sets of drive shafts on the cleaning vehicle, and the working states of the high-pressure pump 3 and low-pressure pump 4 are controlled by controlling the working states of the drive shafts. However, in this application, only a single drive shaft on the cleaning vehicle is needed to drive the low-pressure pump 4 and high-pressure pump 3, and the transmission state can be switched by a switching component to select either a high-pressure water source or a low-pressure water source according to the on-site working environment.

[0024] In some embodiments, the switching component described above may employ, for example... Figure 2 , Figure 4 and Figure 5 The structure shown. See also... Figure 2 , Figure 4 and Figure 5 The switching assembly includes a first gear 61, a first splined shaft 62, and a first splined sleeve 63. The first gear 61 is rotatably mounted on the input shaft 51, and a second gear 611 meshing with the first gear 61 is fixedly mounted on the first output shaft 6. The first splined shaft 62 is fixedly mounted on one side of the first gear 61. The first splined sleeve 63 is mounted on the input shaft 51, and its position on the input shaft 51 has a degree of freedom for adjustment along the axis of the input shaft 51. The first splined sleeve 63 can slide to the outside of the first splined shaft 62 and mesh with it. Both ends of the input shaft 51 are rotatably mounted on the transmission housing 5 via bearings. The first gear 61 is rotatably mounted in the middle of the input shaft 51, and the first splined shaft 62 is fixedly mounted on one side of the first gear 61. The first splined shaft 62 is coaxially arranged with the first gear 61 and the input shaft 51. Furthermore, a first spline sleeve 63 is slidably disposed on the input shaft 51 along the axial direction of the input shaft 51, and an anti-rotation key is provided between the first spline sleeve 63 and the input shaft 51, so that when the input shaft 51 rotates, it can simultaneously drive the first spline sleeve 63 to rotate.

[0025] Specifically, in this embodiment, when the input shaft 51 needs to drive the first output shaft 6 to rotate, the first spline sleeve 63 moves on the input shaft 51 and fits onto the outside of the first spline shaft 62. At this time, the first spline sleeve 63 and the first spline shaft 62 are in a meshing state. Thus, when the input shaft 51 rotates, it can drive the first spline shaft 62 to rotate, thereby causing the first gear 61 to rotate synchronously. The first gear 61 is connected to the first output shaft 6 through the second gear 611, thereby driving the first output shaft 6 to rotate. When the first output shaft 6 is not needed, the first spline sleeve 63 is moved to disengage from the first spline shaft 62, thereby disconnecting the transmission connection between the input shaft 51 and the first output shaft 6.

[0026] Preferably, in this embodiment, chamfers are provided on both the side of the first spline shaft 62 near the first spline sleeve 63 and the side of the first spline sleeve 63 near the first spline shaft 62. The chamfers facilitate the sliding of the first spline shaft 62 into the first spline sleeve 63.

[0027] In some embodiments, the switching component described above may employ, for example... Figure 2 , Figure 4 and Figure 5 The structure shown. See also... Figure 2 , Figure 4 and Figure 5 The switching assembly also includes a third gear 71, a second splined shaft 72, and a second splined sleeve 73. The third gear 71 is rotatably mounted on the input shaft 51, and a fourth gear 711, meshing with the first gear 61, is fixedly mounted on the second output shaft 7. The second splined shaft 72 is fixedly mounted on one side of the third gear 71. The second splined sleeve 73 is mounted on the input shaft 51, and its position on the input shaft 51 has a degree of freedom for adjustment along the axis of the input shaft 51. The second splined sleeve 73 can slide to the outside of the second splined shaft 72 and mesh with it. The third gear 71 is also rotatably mounted in the middle of the input shaft 51, and the second splined shaft 72 is fixedly mounted on one side of the fourth gear 711. The second splined shaft 72 is coaxially arranged with the fourth gear 711 and the input shaft 51. Furthermore, a second spline sleeve 73 is slidably disposed on the input shaft 51 along the axial direction of the input shaft 51, and an anti-rotation key is provided between the second spline sleeve 73 and the input shaft 51, so that when the input shaft 51 rotates, it can simultaneously drive the second spline sleeve 73 to rotate.

[0028] Specifically, in this embodiment, when the input shaft 51 needs to drive the first output shaft 6 to rotate, the second spline sleeve 73 moves on the input shaft 51 and fits onto the outside of the second spline shaft 72. At this time, the second spline sleeve 73 and the second spline shaft 72 are in a meshing state. Thus, when the input shaft 51 rotates, it can drive the second spline shaft 72 to rotate, thereby causing the fourth gear 711 to rotate synchronously. The fourth gear 711 is connected to the first output shaft 6 through the second gear 611, thereby driving the first output shaft 6 to rotate. When the first output shaft 6 is not needed, the second spline sleeve 73 is moved to disengage from the second spline shaft 72, thereby disconnecting the transmission connection between the input shaft 51 and the first output shaft 6.

[0029] Preferably, in this embodiment, chamfers are provided on both the side of the second spline shaft 72 near the second spline sleeve 73 and the side of the second spline sleeve 73 near the second spline shaft 72. The chamfers facilitate the second spline shaft 72 sliding into the second spline sleeve 73.

[0030] Specifically, in this embodiment, the first spline sleeve 63 and the second spline sleeve 73 are either fixedly connected together or are two separate structures. Switching between the high-pressure pump 3 and the low-pressure pump 4 can be accomplished using a single driving source.

[0031] In some embodiments, the first spline sleeve 63 and the second spline sleeve 73 described above can be adopted as follows: Figure 5 The structure shown. See also Figure 5 The first spline sleeve 63 and the second spline sleeve 73 are respectively located between the first gear 61 and the third gear 71, and a push assembly for moving the first spline sleeve 63 and the second spline sleeve 73 on the input shaft 51 is installed inside the transmission box 5. The first spline sleeve 63 and the second spline sleeve 73 are located between the first gear 61 and the second gear 611. By setting up the push assembly, the first spline sleeve 63 and the second spline sleeve 73 can be driven to move along the axis of the transmission shaft, realizing the meshing between the first spline sleeve 63 and the first spline shaft 62 or the meshing between the second spline sleeve 73 and the second spline shaft 72.

[0032] Specifically, in this embodiment, the first spline sleeve 63 and the second spline sleeve 73 are arranged adjacent to each other, which facilitates the arrangement of the position of the pushing component.

[0033] In some embodiments, the aforementioned actuating component may employ, for example... Figure 2 , Figure 6 and Figure 7 The structure shown. See also... Figure 2 , Figure 6 and Figure 7 The driving assembly includes a first sliding sleeve 64 and a piston shaft 8. The first sliding sleeve 64 is connected to a first spline sleeve 63, and a first lever 65 is mounted on the first sliding sleeve 64. The piston shaft 8 is slidably mounted on the transmission housing 5 along the axial direction of the input shaft 51. The transmission housing 5 has a piston hole for mounting the piston shaft 8, and a first vent hole 52 and a second vent hole 53 are connected to the piston hole. The first vent hole 52 and the second vent hole 53 are located on the outer sides of both ends of the piston shaft 8, respectively. The first sliding sleeve 64 is fitted onto the first spline sleeve 63 to drive the first spline sleeve 63 to move along the axial direction of the input shaft 51. The first sliding sleeve 64 is fitted onto the outer side of the first spline sleeve 63, and the first spline sleeve 63 is rotatably mounted inside the first sliding sleeve 64. A guide ring protrudes from the inner wall of the first sliding sleeve 64, and a guide groove that slides with the guide ring is recessed on the outer wall of the first spline sleeve 63. This allows the first spline sleeve 63 to move together with the first sliding sleeve 64 as it moves along the axis of the input shaft 51.

[0034] Specifically, in this embodiment, a slot for mounting a first lever plate 65 is provided on the first sliding sleeve 64, and the first lever plate 65 is inserted into the slot. The other end of the first lever plate 65 is fixedly mounted on the piston shaft 8. A sealed piston hole is provided on the transmission box 5. The piston shaft 8 is slidably disposed inside the piston hole, and a sealing ring connected to the piston hole is provided on the piston shaft 8, thereby ensuring the sealing between the piston shaft 8 and the piston hole.

[0035] Specifically, in this embodiment, a first vent hole 52 and a second vent hole 53 are connected to the piston bore. When the first vent hole is filled with air, the second vent hole 53 is in a venting state; and when the second vent hole 53 is filled with air, the first vent hole 52 is in a venting state. Thus, the position of the piston shaft 8 inside the piston bore can be changed by the pressure difference inside the piston bore, thereby moving the first sliding sleeve 64 via the first lever 65. The operating state of the high-pressure pump 3 can be changed by controlling the air passages of the first vent hole 52 and the second vent hole 53.

[0036] In some embodiments, the aforementioned actuating component may employ, for example... Figure 6 , Figure 7 The structure shown. See also... Figure 6 , Figure 7 A piston sleeve 81 is slidably disposed on the outer side of the piston shaft 8. A second lever 75 is fixedly mounted on the piston sleeve 81, and a second sliding sleeve 74 connected to a second spline sleeve 73 is connected to the bottom end of the second lever 75. The sliding direction of the piston shaft 8 is defined as the first direction. The piston sleeve 81 is fitted onto the outer side of the piston shaft 8, and the piston sleeve 81 is slidably disposed on the piston shaft 8 along the first direction. The outer diameter of the piston shaft 8 at the middle is smaller than the outer diameter of the piston shaft 8 at both ends.

[0037] Specifically, in this embodiment, sealing rings for sealing connection with the piston bore are installed on the outer sides of both ends of the piston shaft 8, thereby ensuring stable movement of the piston shaft 8. The piston sleeve 81 has a degree of freedom to adjust its position on the piston shaft 8 along a first direction. A second lever 75 is fixedly installed on the piston sleeve 81, and the connection method between the second lever 75 and the second sliding sleeve 74 is the same as the connection method between the first lever 65 and the first sliding sleeve 64. When the piston sleeve 81 moves, it can drive the second lever 75 to drive the second sliding sleeve 74 to move, thereby realizing the switching of the connection state between the second spline sleeve 73 and the second spline shaft 72.

[0038] In some embodiments, the piston sleeve 81 may be adopted as follows: Figure 6 , Figure 7 The structure shown. See also... Figure 6 , Figure 7A regulating valve 54 is installed in the middle of the piston bore to control the connection between the piston bore and the outside. The regulating valve 54 is located in the middle of the piston shaft 8 and on the outside of one end of the piston sleeve 81. A vent hole is provided on the piston shaft 8 to connect with the other end of the piston sleeve 81. A vent hole for connecting with the outside is provided in the middle of the piston bore, and the regulating valve 54 is installed inside the vent hole to control its ventilation state. The regulating valve 54 is always located in the middle of the piston rod, and the outer diameter of the middle part of the piston rod is smaller than that of both ends. The valve is spaced apart between the middle part of the piston rod and the inner wall of the piston bore.

[0039] Specifically, in this embodiment, when the first vent 52 is filled with air, the piston rod moves to the right. At this time, the high-pressure pump 3 starts, and when the piston rod is in the right working position, the control valve 54 is located on the left side of the piston sleeve 81. When the control valve 54 is closed, the atmospheric pressure between the piston rod and the piston hole prevents the piston sleeve 81 from moving to the left. However, when the control valve 54 is opened, the air pressure between the piston rod and the piston hole decreases, and the piston shaft 8 has a vent hole connected to the right end of the piston sleeve 81, making the pressure on the right side of the piston sleeve 81 greater than the pressure on the left side, thus pushing the piston sleeve 81 to move to the left. This can drive the second lever 75 to move, starting the low-pressure pump 4.

[0040] Specifically, in this embodiment, when the low-pressure pump 4 and the high-pressure pump 3 work together, the high-pressure pump 3 is started first. After the high-pressure pump 3 is running normally, the control valve 54 is opened to connect the left side of the piston sleeve 81 with the outside world. The piston sleeve 81 drives the second lever to move to the left through the pressure difference, thereby making the second spline sleeve 73 mesh with the second spline shaft 72.

[0041] Specifically, in this embodiment, sealing rings are installed on both the inner and outer rings of the piston sleeve 81 to ensure the sealing effect between the piston sleeve 81 and the piston rod and piston hole.

[0042] Preferably, in this embodiment, the control valve 54 is a three-way valve, with its three ends connected to the first vent 52, the piston hole, and the outside, respectively. A spring is also installed on the piston shaft 8 to push the piston sleeve 81 to the right. When it is necessary to shut down the low-pressure pump 4 separately, the control valve 54 is switched to connect the first vent 52 to the piston hole. At this time, the pressure on both sides of the piston sleeve 81 is balanced, and the piston sleeve 81 moves to the right under the push of the spring, thereby disengaging the second spline sleeve 73 from the second spline shaft 72.

[0043] Specifically, in this embodiment, when the high-pressure pump 3 is turned on alone, the control valve 54 is in a state where the first vent 52 is connected to the piston hole. At this time, the pressure at both ends of the piston sleeve 81 is balanced, and the piston sleeve 81 is acted upon by the spring. The right end of the piston sleeve 81 always abuts against the piston shaft 8, so that when the piston shaft 8 moves to the right, the piston sleeve 81 can move with the piston shaft 8. This avoids the low-pressure pump 4 from being mistakenly turned on if the piston sleeve 81 moves to the left relative to the piston shaft 8 when the high-pressure pump 3 is running alone.

[0044] In some embodiments, the piston shaft 8 may be as follows: Figure 6 The structure shown. See also Figure 6 Both ends of the piston shaft 8 are provided with elastic elements 82 that abut against the ends of the piston shaft 8 and the transmission box 5. The elastic elements 82 are springs. Limiting posts are provided at both ends of the piston hole, and the ends of the piston shaft 8 can abut against the limiting posts. Elastic elements 82 are fitted on the outside of the limiting posts. When both the first through hole and the second through hole are in the exhaust state, the piston shaft 8 can be returned to the center position by the push of the two elastic elements 82. At this time, the first spline sleeve 63 disengages from the first spline shaft 62, and the second spline sleeve 73 disengages from the second spline shaft 72. During the rotation of the input shaft 51, the high-pressure pump 3 and the low-pressure pump 4 are both in the stopped state, and the spray cleaning operation is stopped.

[0045] In some embodiments, the cleaning rack 1 described above can be as follows: Figure 3 The structure shown. See also Figure 3 The cleaning frame 1 includes a main frame 13 mounted on the vehicle body. The position of the main frame 13 on the vehicle body has a degree of freedom to be adjusted along the horizontal angle. A sub-frame 14 is mounted on the main frame 13. The sub-frame 14 on the vehicle body has a degree of freedom to be adjusted along the pitch angle. The first spray pipe 11 and the second spray pipe 12 are both mounted on the sub-frame 14, and the positions of the first spray pipe 11 and the second spray pipe 12 on the sub-frame 14 have a degree of freedom to be adjusted along the horizontal angle.

[0046] Specifically, in this embodiment, the cleaning frame 1 further includes a fixing plate for fixing to the head of the cleaning vehicle. The main frame 13 is hinged to the fixing plate, and the hinge axis of the main frame 13 on the fixing plate is arranged vertically. A cylinder is installed between the main frame 13 and the fixing plate. The fixed end and the driving end of the cylinder are respectively hinged to the fixing plate and the main frame 13, thereby driving the main frame 13 to swing horizontally. During the cleaning operation, by rotating the main frame 13 at a certain angle, debris on the road can be pushed to one side of the road.

[0047] Specifically, in this embodiment, a hinged frame is connected between the sub-frame 14 and the main frame 13. The two ends of the hinged frame are respectively hinged to the main frame 13 and the sub-frame 14, and the axis of the hinge shaft is horizontal. A cylinder is also hinged between the main frame 13 and the sub-frame 14, with its fixed end and driving end respectively hinged to the main frame 13 and the sub-frame 14, thereby enabling the sub-frame 14 to be adjusted along its pitch angle. The first spray pipe 11 and the second spray pipe 12 are mounted on the sub-frame 14. By adjusting the pitch angle of the sub-frame 14 on the main frame 13, the height of the sub-frame 14 can be adjusted to adapt to cleaning under different road conditions.

[0048] Specifically, in this embodiment, mounting plates for mounting the first spray pipe 11 and the second spray pipe 12 are hinged at both ends of the sub-frame 14. The axis of the hinge shaft of the mounting plate on the sub-frame 14 is arranged vertically. A cylinder is hinged between the sub-frame 14 and the mounting plate, with the fixed end and driving end of the cylinder respectively hinged to the sub-frame 14 and the mounting plate. By changing the angle of the first spray pipe 11 and the second spray pipe 12 on the sub-frame 14 along the horizontal direction, the lateral range of the spray pipes can be adjusted, making it suitable for cleaning roads of different widths.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high- and low-pressure urban road cleaning and watering truck, characterized in that, include: Vehicle body; A cleaning rack (1) is installed on the front side of the vehicle body. A first spray pipe (11) is installed on the left side of the cleaning rack (1), and a second spray pipe (12) is installed on the right side of the cleaning rack (1). The converter (2) includes a high-pressure pipe (21) and a low-pressure pipe (22), and a control valve (23) connected to the middle of the high-pressure pipe (21) and the middle of the low-pressure pipe (22). The outlet of the low-pressure pipe (22) is connected to the first spray pipe (11), and the outlet of the high-pressure pipe (21) is connected to the second spray pipe (12). The high-pressure pump (3) has its outlet end connected to the inlet end of the high-pressure pipe (21); The low-pressure pump (4) and the high-pressure pump (3) are both installed on the vehicle body, and the outlet of the low-pressure pump (4) is connected to the low-pressure pipe (22).

2. The high and low pressure urban road cleaning and watering truck as described in claim 1, characterized in that, A transmission box (5) is also provided between the high-pressure pump (3) and the low-pressure pump (4). An input shaft (51), a first output shaft (6), and a second output shaft (7) are rotatably mounted on the transmission box (5). The first output shaft (6) is connected to the drive shaft of the high-pressure pump (3), and the second output shaft (7) is connected to the drive shaft of the low-pressure pump (4). A switching component for changing the transmission state between the input shaft (51) and the first output shaft (6) and the second output shaft (7) is also provided inside the transmission box (5).

3. The high and low pressure urban road cleaning and watering truck as described in claim 2, characterized in that, The switching component includes: A first gear (61) is rotatably mounted on the input shaft (51), and a second gear (611) that meshes with the first gear (61) is fixedly mounted on the first output shaft (6). The first spline shaft (62) is fixedly installed on one side of the first gear (61); A first spline sleeve (63) is mounted on the input shaft (51). The position of the first spline sleeve (63) on the input shaft (51) has a degree of freedom that can be adjusted along the axis of the input shaft (51). The first spline sleeve (63) can slide to the outside of the first spline shaft (62) and engage with the first spline shaft (62).

4. The high and low pressure urban road cleaning and watering truck as described in claim 3, characterized in that, The switching component also includes: The third gear (71) is rotatably mounted on the input shaft (51), and the second output shaft (7) is fixedly mounted with a fourth gear (711) that meshes with the first gear (61); The second splined shaft (72) is fixedly installed on one side of the third gear (71); The second spline sleeve (73) is mounted on the input shaft (51). The position of the second spline sleeve (73) on the input shaft (51) has a degree of freedom that can be adjusted along the axis of the input shaft (51). The second spline sleeve (73) can slide to the outside of the second spline shaft (72) and engage with the second spline shaft (72).

5. The high and low pressure urban road cleaning and watering truck as described in claim 4, characterized in that, The first spline sleeve (63) and the second spline sleeve (73) are respectively located between the first gear (61) and the third gear (71), and a push assembly for pushing the first spline sleeve (63) and the second spline sleeve (73) to move on the input shaft (51) is installed inside the transmission box (5).

6. The high and low pressure urban road cleaning and watering truck as described in claim 5, characterized in that, The actuating component includes: The first sliding sleeve (64) is connected to the first spline sleeve (63), and the first sliding sleeve (64) is equipped with a first lever plate (65); The piston shaft (8) is slidably disposed on the transmission box (5) along the axial direction of the input shaft (51). The transmission box (5) is provided with a piston hole for mounting the piston shaft (8). A first vent hole (52) and a second vent hole (53) are connected to the piston hole. The first vent hole (52) and the second vent hole (53) are respectively located on the outer sides of both ends of the piston shaft (8).

7. The high and low pressure urban road cleaning and watering truck as described in claim 6, characterized in that, A piston sleeve (81) is slidably disposed on the outside of the piston shaft (8), and a second lever (75) is fixedly installed on the piston sleeve (81). The bottom end of the second lever (75) is connected to a second sliding sleeve (74) that is connected to the second spline sleeve (73).

8. The high and low pressure urban road cleaning and watering truck as described in claim 7, characterized in that, A control valve (54) for controlling the communication state between the piston hole and the outside is also installed in the middle of the piston hole. The control valve (54) is located in the middle of the piston shaft (8) and on the outside of one end of the piston sleeve (81). A vent hole communicating with the other end of the piston sleeve (81) is provided on the piston shaft (8).

9. The high and low pressure urban road cleaning and watering truck as described in claim 6, characterized in that, Both ends of the piston shaft (8) are provided with elastic elements (82) that abut against the end of the piston shaft (8) and the transmission box (5).

10. The high and low pressure urban road cleaning and watering truck as described in claim 1, characterized in that, The cleaning rack (1) includes a main frame (13) mounted on the vehicle body. The main frame (13) has a degree of freedom to be adjusted along the horizontal angle on the vehicle body. A sub-frame (14) is mounted on the main frame (13). The sub-frame (14) has a degree of freedom to be adjusted along the pitch angle on the vehicle body. The first spray pipe (11) and the second spray pipe (12) are both mounted on the sub-frame (14), and the positions of the first spray pipe (11) and the second spray pipe (12) on the sub-frame (14) have a degree of freedom to be adjusted along the horizontal angle.

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