Hydraulic system and washing vehicle

Abstract

The embodiment of the utility model provides a hydraulic system and a washing vehicle, and relates to the technical field of high-altitude road surface washing vehicles. The hydraulic system comprises a power assembly, a first reversing valve, a reversing valve set, a control valve set, a lifting oil cylinder, a water path control oil cylinder and an oil tank. Wherein an outlet of the oil tank is communicated with an inlet of the power assembly; an outlet of the power assembly communicates with the main oil way. The main oil way communicates with the first oil way and the second oil way. A first reversing valve and a lifting oil cylinder are sequentially arranged on the first oil way; a reversing valve group and a water path control oil cylinder are sequentially arranged on the second oil path; the reversing valve group is used for controlling the water path control oil cylinder to act; the waterway control oil cylinder is used for controlling starting and closing of the water spraying assembly. And a control valve group is arranged between the first reversing valve and the lifting oil cylinder. Through the design, the same power assembly can be adopted to control lifting of the washing vehicle platform and starting and stopping of the water spraying assembly, and the overall control structure is simplified.

Description

Technical Field

[0001] This utility model relates to the field of washing vehicle technology, and more specifically, to a hydraulic system and a washing vehicle. Background Technology

[0002] Aerial cleaning and road washing trucks are specialized vehicles for aerial cleaning and road washing. They are primarily used for cleaning high-rise buildings, roads, and trees and green belts. They can perform efficient cleaning in various complex environments and are particularly suitable for urban cleaning, factory and mining construction projects, and other similar scenarios.

[0003] However, currently, most high-altitude road cleaning vehicles use pneumatic systems to control the water valves, requiring the installation of pneumatic components such as air pumps, air tanks, and solenoid valve assemblies on the vehicle. The lifting platform's raising and lowering control also necessitates a separate control system. The overall control system and piping of the cleaning vehicle are extremely complex, with numerous structural components, requiring significant space and resulting in high production costs. Utility Model Content

[0004] This utility model provides a hydraulic system and a washing vehicle that can use a single power unit to control lifting and water spraying separately, which simplifies the structure, saves space, and reduces costs.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] An embodiment of this utility model provides a hydraulic system, which includes:

[0007] Power assembly, first directional valve, directional valve assembly, control valve assembly, lifting cylinder, water circuit control cylinder and oil tank;

[0008] The outlet of the oil tank is connected to the inlet of the power assembly; the outlet of the power assembly is connected to the main oil circuit, which is connected to the first oil circuit and the second oil circuit respectively; the first oil circuit is sequentially provided with the first reversing valve and the lifting cylinder; the second oil circuit is sequentially provided with the reversing valve group and the water circuit control cylinder, the reversing valve group is used to control the action of the water circuit control cylinder; the water circuit control cylinder is used to control the start and stop of the water spray assembly.

[0009] The control valve assembly is provided between the first reversing valve and the lifting cylinder.

[0010] In an optional embodiment, the control valve group includes a third directional valve and a check valve. The third directional valve and the check valve are both disposed on the connecting oil line between the lifting cylinder and the first directional valve, and the third directional valve and the check valve are disposed in parallel.

[0011] The inlet of the one-way valve is connected to the first directional valve, and the outlet of the one-way valve is connected to the lifting cylinder.

[0012] In an optional embodiment, the control valve assembly further includes a first throttle valve, which is disposed between the first directional valve and the third directional valve, and the first throttle valve is located on the parallel branch where the third directional valve is located.

[0013] In an optional embodiment, the reversing valve group includes multiple fourth reversing valves connected in parallel; the number of water circuit control cylinders is multiple; the multiple fourth reversing valves are configured in a one-to-one correspondence with the multiple water circuit control cylinders; the oil inlet of each fourth reversing valve is connected to the outlet of the power component, and the oil return port of each fourth reversing valve is connected to the inlet of the power component; the first valve port of each fourth reversing valve and the second valve port of the reversing valve group are respectively connected to the two chambers of the corresponding water circuit control cylinder.

[0014] In an optional implementation, the fourth directional valve is a three-position four-way valve.

[0015] In an optional embodiment, the hydraulic system further includes at least one shut-off valve connected to the water circuit control cylinder, and the water circuit control cylinder is used to control the opening and closing of the shut-off valve; the inlet of the shut-off valve is used to communicate with a water source, and the outlet of the shut-off valve is used to communicate with the water spray assembly.

[0016] In an optional embodiment, the hydraulic system further includes a second directional valve, the inlet of which is connected to the outlet of the power assembly, and the outlet of which is connected to the inlet of the oil tank.

[0017] In an optional embodiment, the power assembly includes a drive unit and an oil pump, the drive unit being electrically connected to the oil pump; the outlet of the oil tank is connected to the inlet of the oil pump, and the outlet of the oil pump is connected to the main oil circuit.

[0018] In an optional embodiment, the hydraulic system further includes a relief valve, the inlet of which is connected to the outlet of the oil pump, and the outlet of which is connected to the inlet of the oil tank.

[0019] In an optional embodiment, the control valve assembly is provided with a manual emergency release button, which is used to manually control the descent of the lifting cylinder when the electrical signal fails.

[0020] An embodiment of this utility model also provides a washing vehicle, including a vehicle body and a hydraulic system as described in any of the above embodiments, wherein the hydraulic system is disposed on the vehicle body.

[0021] The beneficial effects of the hydraulic system and washing vehicle of this utility model embodiment include, for example:

[0022] The hydraulic system includes a power unit, a first directional valve, a directional valve assembly, a control valve assembly, a lifting cylinder, a water control cylinder, and an oil tank. The outlet of the oil tank is connected to the inlet of the power unit. The outlet of the power unit is connected to the main oil circuit, which in turn connects to the first and second oil circuits. The first oil circuit contains the first directional valve and the lifting cylinder. The second oil circuit contains the directional valve assembly and the water control cylinder. The directional valve assembly controls the movement of the water control cylinder, and the water control cylinder controls the start and stop of the water spray assembly. A control valve assembly is located between the first directional valve and the lifting cylinder. This design allows the same power unit to control the lifting and lowering of the washing vehicle platform and the start and stop of the water spray assembly, simplifying the overall control structure, reducing space requirements, and lowering production costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the washing vehicle provided in an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the hydraulic system provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a hydraulic system including a shut-off valve provided in an embodiment of the present invention.

[0027] Icons: 1000 - Washing truck; 100 - Hydraulic system; 110 - Power component; 111 - Drive component; 112 - Oil pump; 120 - Second directional valve; 130 - First directional valve; 140 - Directional valve assembly; 141 - Fourth directional valve; 150 - Control valve assembly; 151 - Third directional valve; 152 - Check valve; 153 - First throttle valve; 160 - Lifting cylinder; 170 - Water circuit control cylinder; 180 - Shut-off valve; 190 - Overflow valve; 200 - Vehicle body; 300 - Oil tank; 400 - Main oil circuit; 500 - First oil circuit; 600 - Second oil circuit. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] Aerial cleaning and road washing trucks are specialized vehicles for high-altitude cleaning and road washing, primarily used for cleaning high-rise buildings, roads, and trees and green belts. They can perform efficient cleaning in various complex environments, making them particularly suitable for urban cleaning, factory and mining construction projects, and other similar scenarios. However, currently, most existing aerial cleaning and road washing trucks use pneumatic systems to control the water valves, requiring the installation of pneumatic components such as air pumps, air tanks, and solenoid valve assemblies. The lifting platform's raising and lowering control also requires a separate control system. The overall control system and piping of the washing truck are very complex, with numerous structural components, a large footprint, and high production costs.

[0035] Based on this, please refer to Figures 1-3The hydraulic system 100 provided in the embodiments of this utility model can effectively improve the aforementioned technical problems. This hydraulic system 100 can use the same power component 110 to control the lifting and lowering of the washing truck 1000 platform and the start and stop of the water spray component, simplifying the overall control structure and saving costs. This hydraulic system 100 is mainly used in the washing truck 1000, and the washing truck 1000 with this hydraulic system 100 also has the same functions as described above, which will not be elaborated further here.

[0036] Figure 1 This is a schematic diagram of the washing cart 1000 provided in an embodiment of this utility model. (See diagram below.) Figure 1 As shown, the washing vehicle 1000 in this embodiment includes a vehicle body 200 and a hydraulic system 100, with the hydraulic system 100 mounted on the vehicle body 200. The vehicle body 200 is equipped with a lifting platform and a water spray assembly. The hydraulic system 100 controls the lifting and lowering of the lifting platform and the activation and deactivation of the water spray assembly. Operators can control their working height by adjusting the lifting platform, and then activate the water spray assembly to wash the target object once the designated working height is reached. The water spray assembly can be a handheld spray gun, a front spray bar, a high-altitude cleaning component, a fixed-point cleaning component, etc., and is not limited here. The vehicle body 200 also has a power supply unit, which provides high-voltage power to the power component 110 of the hydraulic system 100. In this embodiment, the power supply unit is a storage battery, mounted on the chassis of the vehicle body 200. Of course, the power supply unit can also be replaced with a solid-state battery, a lithium-sulfur battery, etc., and is not limited here.

[0037] The hydraulic system 100 is described in detail below.

[0038] Figure 2 This is a schematic diagram of the hydraulic system 100 provided in an embodiment of this utility model. Please refer to... Figure 2 The hydraulic system 100 provided in this embodiment includes a power assembly 110, a first directional valve 130, a directional valve group 140, a control valve group 150, a lifting cylinder 160, a water circuit control cylinder 170, and an oil tank 300; wherein, the outlet of the oil tank 300 is connected to the inlet of the power assembly 110; the outlet of the power assembly 110 is connected to the main oil circuit 400, and the main oil circuit 400 is connected to the first oil circuit 500 and the second oil circuit 600 respectively; the first oil circuit 500 is sequentially provided with There is a first directional valve 130 and a lifting cylinder 160. The first directional valve 130 is close to the main oil circuit 400. A directional valve assembly 140 and a water circuit control cylinder 170 are sequentially arranged on the second oil circuit 600. The directional valve assembly 140 is close to the main oil circuit 400 and is used to control the operation of the water circuit control cylinder 170. The water circuit control cylinder 170 is used to control the start and stop of the water spray assembly. A control valve assembly 150 is arranged between the first directional valve 130 and the lifting cylinder 160.

[0039] The hydraulic system 100 in this embodiment also includes a second directional valve 120. The inlet of the second directional valve 120 is connected to the outlet of the power assembly 110, and the outlet of the second directional valve 120 is connected to the inlet of the oil tank 300. The oil circuit containing the second directional valve 120 is an unloading oil circuit. When the second directional valve 120 is opened and the main oil circuit is directly connected to the oil tank 300, the pressurized oil in the oil tank 300 flows directly back to the oil tank 300 through the power assembly 110 and the second directional valve 120, thereby achieving unloading. The unloading oil circuit allows the oil pump 112 to operate with near-zero power loss when the power assembly 110 is not frequently opened and closed, thereby reducing power loss and system heat generation.

[0040] When the lifting platform needs to rise, the second directional valve 120 and the first directional valve 130 are energized, while the third directional valve 151 is de-energized. The pressurized oil in the oil tank 300 is transported via the power assembly 110, flowing sequentially through the first directional valve 130 and the third directional valve 151 into the lifting cylinder 160, causing the lifting cylinder 160 to actuate and raise the lifting platform. When the lifting platform needs to lower, the first directional valve 130 is de-energized, while the third directional valve 151 is energized. The oil in the lifting cylinder 160 flows sequentially through the third directional valve 151, the first directional valve 130, and the second directional valve 120, returning to the power assembly 110.

[0041] When it is necessary to control the water spraying action, the first reversing valve 130 is de-energized, the second reversing valve 120 is energized, the pressure oil in the oil tank 300 is delivered through the power assembly 110, the pressure oil enters the reversing valve from the oil inlet of the reversing valve assembly 140, and then the water circuit control cylinder 170 is controlled to operate by controlling the opening and closing of the reversing valve assembly 140, so as to control the start and stop of the water spraying assembly.

[0042] The above design allows the same power unit 110 to control the lifting and lowering of the washing vehicle 1000 platform and the start and stop of the water spraying components, simplifying the overall control structure, reducing space occupation, and lowering production costs.

[0043] To maintain stable pressure in the hydraulic system 100 during the control of the lifting platform's ascent and descent, and to prevent system malfunctions or efficiency reductions due to pressure fluctuations or leaks, please refer to [further details needed]. Figure 1In this embodiment, the control valve group 150 includes a third directional valve 151 and a check valve 152. Both the third directional valve 151 and the check valve 152 are located on the connecting oil line between the lifting cylinder 160 and the first directional valve 130, and are connected in parallel. The inlet of the check valve 152 is connected to the first directional valve 130, and the outlet of the check valve 152 is connected to the lifting cylinder 160. By connecting a check valve 152 passage in parallel with the passage of the third directional valve 151, the check valve 152 only allows pressurized oil to flow from the power assembly 110 to the lifting cylinder 160, and does not allow pressurized oil to flow from the lifting cylinder 160 to the power assembly 110 along the check valve 152 passage. This design can maintain the stability of the pressure of the entire hydraulic system 100 during the process of the power assembly 110 controlling the lifting platform to rise or fall.

[0044] Please continue reading. Figure 1 To control the descent rate of the lifting platform, the control valve group 150 in this embodiment further includes a first throttle valve 153. The first throttle valve 153 is disposed between the first directional valve 130 and the third directional valve 151, and is located on the parallel branch where the third directional valve 151 is located. Of course, to control the rising rate of the lifting platform, throttle valves can also be installed at other locations, depending on the actual control situation, and are not limited here.

[0045] In addition, to prevent the lifting platform from descending normally in case of accidents, the control valve group 150 in this embodiment is equipped with a manual emergency release button. The manual emergency release button is used to manually control the descent of the lifting cylinder 160 when the electrical signal fails.

[0046] Because high-altitude spraying involves various scenarios, different external water spray components with varying functions are required. For easy integration of multiple water spray functions to meet the needs of diverse cleaning situations, please refer to [link / reference needed]. Figure 2In this embodiment, the reversing valve group 140 includes multiple fourth reversing valves 141 connected in parallel; the number of water circuit control cylinders 170 is also multiple; each of the multiple fourth reversing valves 141 corresponds to one of the multiple water circuit control cylinders 170; the oil inlet P of each fourth reversing valve 141 is connected to the outlet of the power component 110, and the oil return port T of each fourth reversing valve 141 is connected to the inlet of the power component 110; the first valve port A of each fourth reversing valve 141 and the second valve port B of the reversing valve group 140 are respectively connected to the two chambers of the corresponding water circuit control cylinder 170. The number of water spray components is the same as the number of water circuit control cylinders 170, and each water circuit control cylinder 170 controls one water spray component. The water spray components can be handheld spray guns, front spray booms, high-altitude cleaning components, or fixed-point cleaning components. Multiple water spray components can have the same structure or different structures, depending on the actual function, and are not limited here. Of course, it is also possible to set only a fourth directional valve 141 and a water circuit control cylinder 170, depending on the actual situation, and no limitation is made here.

[0047] In this embodiment, the fourth directional valve 141 is a three-position four-way valve. Using a three-position four-way valve offers advantages such as energy saving, flexible control, safety and reliability, ease of operation, low maintenance costs, and long service life. Of course, two two-position three-way directional valves can also be used to replace one three-position four-way valve. Furthermore, depending on the specific start-stop principle of the water spray assembly, other types of directional valves can be selected, and this is not limited here.

[0048] Figure 3 For a schematic diagram of the hydraulic system 100 including the shut-off valve 180 provided in an embodiment of this utility model, please refer to [link / reference]. Figure 3 To improve the precise control of the water spray assembly's start and stop, the hydraulic system 100 in this embodiment also includes at least one shut-off valve 180. The shut-off valve 180 is connected to a water circuit control cylinder 170, and the water circuit control cylinder 170 controls the on / off state of the shut-off valve 180. The inlet of the shut-off valve 180 is connected to a water source, and the outlet of the shut-off valve 180 is connected to the water spray assembly. In this embodiment, the number of shut-off valves 180 is the same as the number of water circuit control cylinders 170, with each water circuit control cylinder 170 controlling one shut-off valve 180. The shut-off valve 180 in this embodiment is a ball valve. Ball valves offer low fluid resistance, rapid and convenient opening and closing, good sealing performance, ease of automation control, and convenient maintenance. Of course, the shut-off valve 180 can also be replaced by a gate valve, butterfly valve, electric actuator, or other similar valve, depending on factors such as actual control accuracy, response rate, and cost; no limitation is made here.

[0049] In this embodiment, the water control cylinder 170 and the lifting cylinder 160 can also be replaced with an electric push rod or other components that can achieve telescopic movement, which is not limited here.

[0050] Please see Figure 3 and combined Figure 2 In this embodiment, the power assembly 110 includes a drive component 111 and an oil pump 112, with the drive component 111 electrically connected to the oil pump 112. The outlet of the oil tank 300 is connected to the inlet of the oil pump 112, and the oil pump 112 is connected to the main oil circuit 400. In this embodiment, the oil pump 112 is driven by a motor, meaning the drive component 111 can be a motor. Of course, other drive components 111, such as motors, can also be used instead, and this is not limited here. Furthermore, to ensure that the pressurized oil output from the oil tank 300 is free of impurities and to extend the service life of the equipment, the power assembly 110 in this embodiment also includes a filter. The filter can be installed at the outlet of the oil tank 300, or at the inlet of the oil tank 300; both can be installed simultaneously, or only one location can be installed, and this is not limited here. By installing a filter, impurities such as metal shavings, dust, and dirt can be removed from the oil. Clean oil can reduce wear on pumps, valves, and other components, thereby extending the service life of the equipment and reducing the frequency of maintenance and component replacement. Furthermore, impurities in the hydraulic fluid can affect its fluidity, thereby impacting the efficiency of the hydraulic system 100. Using a filter can keep the hydraulic fluid clean, ensuring that the hydraulic system 100 operates at its optimal condition and improving overall efficiency. In addition, the accumulation of contaminants can lead to system malfunctions, such as oil circuit blockages and component jamming. Installing a filter can effectively reduce the occurrence of these malfunctions and improve system reliability.

[0051] To ensure the safety and pressure stability of the entire hydraulic system 100, the hydraulic system 100 in this embodiment also includes a relief valve 190. The inlet of the relief valve 190 is connected to the outlet of the oil pump 112, and the outlet of the relief valve 190 is connected to the inlet of the oil tank 300. The relief valve 190 limits the pressure rise, preventing damage to components and pipelines in the hydraulic system 100 due to excessive pressure. Furthermore, the relief valve 190 can maintain the pressure of the hydraulic system 100 within a certain range, preventing system instability due to excessive pressure.

[0052] The working principle of the hydraulic system 100 provided in this embodiment is as follows:

[0053] When the lifting platform needs to rise, the second directional valve 120 and the first directional valve 130 are energized, while the third directional valve 151 is de-energized. The pressurized oil in the oil tank 300 is transported via the power assembly 110, flowing sequentially through the first directional valve 130 and the third directional valve 151 into the lifting cylinder 160, causing the lifting cylinder 160 to actuate and raise the lifting platform. When the lifting platform needs to lower, the first directional valve 130 is de-energized, while the third directional valve 151 is energized. The oil in the lifting cylinder 160 flows sequentially through the third directional valve 151, the first directional valve 130, and the second directional valve 120, returning to the power assembly 110.

[0054] When it is necessary to control the water spraying action, the first reversing valve 130 is de-energized, the second reversing valve 120 is energized, the pressure oil in the oil tank 300 is delivered through the power assembly 110, the pressure oil enters the reversing valve from the oil inlet of the reversing valve assembly 140, and then the water circuit control cylinder 170 is controlled to operate by controlling the opening and closing of the reversing valve assembly 140, so as to control the start and stop of the water spraying assembly.

[0055] In summary, the hydraulic system 100 includes a power assembly 110, a first directional valve 130, a directional valve group 140, a control valve group 150, a lifting cylinder 160, a water circuit control cylinder 170, and an oil tank 300; wherein, the outlet of the oil tank 300 is connected to the inlet of the power assembly 110; the outlet of the power assembly 110 is connected to the main oil circuit 400, and the main oil circuit 400 is connected to the first oil circuit 500 and the second oil circuit 600 respectively; the first oil circuit 500 is sequentially equipped with... A first directional valve 130 and a lifting cylinder 160 are connected. The first directional valve 130 is located near the main oil circuit 400. A directional valve assembly 140 and a water circuit control cylinder 170 are sequentially installed on the second oil circuit 600. The directional valve assembly 140 is located near the main oil circuit 400 and is used to control the operation of the water circuit control cylinder 170. The water circuit control cylinder 170 is used to control the start and stop of the water spray assembly. A control valve assembly 150 is installed between the first directional valve 130 and the lifting cylinder 160. Through the above design, the same power unit 110 can be used to control the lifting and lowering of the washing vehicle 1000 platform and the start and stop of the water spray assembly, simplifying the overall control structure, reducing space occupation, and lowering production costs.

[0056] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic system, characterized in that, include: The power unit (110), the first directional valve (130), the directional valve assembly (140), the control valve assembly (150), the lifting cylinder (160), the water circuit control cylinder (170), and the oil tank (300); The outlet of the oil tank (300) is connected to the inlet of the power assembly (110); the outlet of the power assembly (110) is connected to the main oil circuit (400), which is connected to the first oil circuit (500) and the second oil circuit (600); the first oil circuit (500) is sequentially provided with the first reversing valve (130) and the lifting cylinder (160); the second oil circuit (600) is sequentially provided with the reversing valve assembly (140) and the water circuit control cylinder (170), the reversing valve assembly (140) is used to control the action of the water circuit control cylinder (170); the water circuit control cylinder (170) is used to control the start and stop of the water spray assembly; The control valve group (150) is provided between the first reversing valve (130) and the lifting cylinder (160).

2. The hydraulic system according to claim 1, characterized in that, The control valve group (150) includes a third directional valve (151) and a check valve (152). The third directional valve (151) and the check valve (152) are both located on the connecting oil line between the lifting cylinder (160) and the first directional valve (130), and the third directional valve (151) and the check valve (152) are connected in parallel. The inlet of the one-way valve (152) is connected to the first directional valve (130), and the outlet of the one-way valve (152) is connected to the lifting cylinder (160).

3. The hydraulic system according to claim 2, characterized in that, The control valve group (150) further includes a first throttle valve (153), which is disposed between the first reversing valve (130) and the third reversing valve (151), and the first throttle valve (153) is located on the parallel branch where the third reversing valve (151) is located.

4. The hydraulic system according to claim 1, characterized in that, The reversing valve group (140) includes multiple fourth reversing valves (141), which are connected in parallel. The number of water circuit control cylinders (170) is also multiple. Each of the multiple fourth reversing valves (141) is configured in a one-to-one correspondence with a single water circuit control cylinder (170). The oil inlet of each fourth reversing valve (141) is connected to the outlet of the power assembly (110), and the oil return port of each fourth reversing valve (141) is connected to the inlet of the power assembly (110). The first valve port of each fourth reversing valve (141) and the second valve port of the reversing valve group (140) are respectively connected to the two chambers of the corresponding water circuit control cylinder (170).

5. The hydraulic system according to claim 4, characterized in that, The fourth directional valve (141) is a three-position four-way valve.

6. The hydraulic system according to claim 4, characterized in that, The hydraulic system (100) further includes at least one shut-off valve (180), which is connected to the water circuit control cylinder (170) and is used to control the opening and closing of the shut-off valve (180); the inlet of the shut-off valve (180) is used to communicate with a water source, and the outlet of the shut-off valve (180) is used to communicate with the water spray assembly.

7. The hydraulic system according to claim 1, characterized in that, The hydraulic system (100) further includes a second directional valve (120), the inlet of which is connected to the outlet of the power assembly (110), and the outlet of which is connected to the inlet of the oil tank (300).

8. The hydraulic system according to claim 1, characterized in that, The power assembly (110) includes a drive unit (111) and an oil pump (112), the drive unit (111) being electrically connected to the oil pump (112); the outlet of the oil tank (300) is connected to the inlet of the oil pump (112), and the outlet of the oil pump (112) is connected to the main oil circuit (400).

9. The hydraulic system according to claim 8, characterized in that, The hydraulic system (100) also includes a relief valve (190), the inlet of which is connected to the outlet of the oil pump (112), and the outlet of which is connected to the inlet of the oil tank (300).

10. A washing vehicle, characterized in that, It includes a vehicle body (200) and a hydraulic system (100) as described in any one of claims 1-9, wherein the hydraulic system (100) is disposed on the vehicle body (200).

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