Sanitation cleaning vehicle

Abstract

This invention discloses a sanitation cleaning vehicle, including a tank assembly comprising a tank body and an overflow pipe. The overflow pipe is disposed within the tank body, and its upper end is provided with an anti-drip structure that covers the upper port of the overflow pipe. The anti-drip structure is fixed to the tank body and is a downward-facing cavity structure with a gap between the upper port of the overflow pipe and the inner top of the cavity structure. The overflow pipe and the protective cover form the anti-drip structure. The upper port of the overflow pipe is moved downwards, and a protective cover is added to the upper end. There is space between the top of the protective cover and the upper end of the overflow pipe, which prevents water sloshing in the tank during vehicle transport from flowing out of the overflow pipe, thus avoiding water waste. Furthermore, the integrated design of the overflow pipe and the protective cover facilitates arrangement and fixation, resulting in a stable and reliable structure.

Description

Technical Field

[0001] This invention relates to the field of sanitation vehicle technology, and in particular to a sanitation cleaning vehicle. Background Technology

[0002] Currently, cleaning vehicles are widely used in urban roads, large factory areas, and gardens to remove various dirt, oil stains, dust, etc. from the road surface. Their purpose includes improving traffic safety, improving driving comfort, extending the service life of roads, protecting the environment, enhancing the city's image, and promoting smooth traffic flow. Regular cleaning can keep roads clean.

[0003] Existing sanitation cleaning vehicles generally include a chassis, tank, water system, air system, low-voltage electrical system, and control system. The tank consists of a cylindrical body, front and rear end caps, baffles, manhole cover, overflow pipe, cable conduit, and bottom water inlet pipe. When the cleaning vehicle is in operation, braking, going over potholes, over obstacles, or turning, the tank experiences significant inertial force when fully loaded. The water inside the tank sways back and forth and side to side, causing water to overflow from the overflow pipe and spill onto the road, wasting water resources and increasing operating costs. For example, a water truck tank disclosed in patent CN116065525A exhibits the above-mentioned problems when fully loaded. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a sanitation cleaning vehicle that prevents water in the tank from easily overflowing from the overflow pipe.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This application provides a sanitation cleaning vehicle, including a tank assembly, the tank assembly including a tank body and an overflow pipe, the overflow pipe being disposed in the tank body, and the upper end of the overflow pipe being provided with an anti-drip structure, the anti-drip structure covering the upper port of the overflow pipe.

[0006] Further or preferred: The anti-drip structure is fixed to the tank body. The anti-drip structure is a cavity structure with the opening facing downwards, and there is a gap between the upper port of the overflow pipe and the inner top of the cavity structure.

[0007] The anti-drip structure is a protective cover, the lower part of which overlaps with the upper end of the overflow pipe, and there is a gap between the inner wall of the protective cover and the outer edge of the upper end of the overflow pipe.

[0008] The top of the tank is provided with a manhole structure, and the protective cover is fixed to the top of the tank and set near the manhole structure.

[0009] The protective cover is a square or cylindrical cover, and the vertical axis of the protective cover is coaxial with the vertical axis of the overflow pipe.

[0010] The top of the tank has a circular hole, and a protective cover is welded and fixed inside the circular hole. The lower end of the protective cover is located inside the tank.

[0011] The lower port of the protective cover is provided with an inner plate, and a central hole is provided at the center of the inner plate. The upper end of the overflow pipe is provided through the central hole, and a water inlet hole is provided on the inner plate between the central hole and the edge.

[0012] The inner plate of the protective cover is an annular plate, and the water inlet is a set of arc holes arranged circumferentially along the inner plate of the protective cover.

[0013] The inner edge of the central hole of the inner plate of the protective cover is fixedly connected to the outer edge of the overflow pipe.

[0014] The inner plate of the protective cover consists of two annular plates arranged vertically, with the water inlet holes on the two annular plates being staggered.

[0015] Compared with the prior art, the present invention has the following advantages: This sanitation cleaning vehicle is reasonably designed. The overflow pipe and the protective cover form an anti-drip structure. The upper end of the overflow pipe is moved down as a whole, and a protective cover is added to the upper end. There is space between the top of the protective cover and the upper end of the overflow pipe, which can prevent water that shakes in the tank during vehicle transfer from flowing out of the overflow pipe and avoid water waste. In addition, the overflow pipe and the protective cover are integrated, which is convenient for layout and fixation, and the structure is stable and reliable. Attached Figure Description

[0016] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings: Figure 1 This is a schematic diagram of the sanitation cleaning vehicle of the present invention.

[0017] Figure 2 This is a schematic diagram of the tank structure of the cleaning vehicle of the present invention.

[0018] Figure 3 This is a schematic diagram of the cross-section of the cleaning tank of the present invention.

[0019] Figure 4 This is a schematic diagram of the manhole structure of the cleaning vehicle of the present invention.

[0020] Figure 5 and Figure 6 This is a schematic diagram of the protective cover structure of the present invention.

[0021] Figure 7 This is a schematic diagram showing the water level changes at the bottom of the container.

[0022] Figure 8 This is a schematic diagram illustrating the water level changes at the top of the device.

[0023] In the picture: 1-Cleaning chassis, 2-Low-voltage electrical system, 3-Tank assembly, 4-Water system, 5-Air system, 6-Control system, 7-Bottom water inlet pipe, 8-Bottom water inlet, 9-Top water inlet; 31-Tank body, 32-Manhole cover, 33-Sealing ring, 34-Filter screen, 35-Manhole ring, 36-Protective cover, 3601-Inner plate of protective cover, 3602-Water inlet, 37-Overflow pipe. Detailed Implementation

[0024] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0025] Although the invention has been shown and described herein with reference to specific embodiments, it is not intended to be limited to the details shown. Rather, various modifications in detail may be made within the equivalent scope and scope of the claims without departing from the invention. In the drawings, the same item numbers refer to the same elements.

[0026] Throughout this disclosure, various terms are used to describe the physical shape or arrangement of features. Many of these terms are used to describe features conforming to a cylindrical or generally cylindrical geometry with the feature as its radius and a central axis perpendicular to that radius. Unless otherwise specified, the terms are given the following meanings: The terms “longitudinal,” “longitudinal,” “axial,” and “axial” refer to a direction, dimension, or orientation parallel to the central axis. The terms “radial” and “radially” refer to a direction, dimension, or orientation perpendicular to the central axis. The terms “inward” and “inner” refer to a direction, dimension, or orientation extending radially toward the central axis. The terms “outward” and “outer” refer to a direction, dimension, or orientation extending radially away from the central axis.

[0027] In this specification, relative terms such as “horizontal,” “vertical,” “upward,” “downward,” “top,” and “bottom,” and their derivatives (e.g., “horizontal,” “downward,” “upward,” etc.) should be interpreted as referring to the direction described or the direction shown in the accompanying drawings. These relative terms are for ease of description and are not generally intended to require a specific direction.

[0028] like Figure 1 As shown, existing sanitation cleaning vehicles generally include a cleaning vehicle chassis, tank, water system, air system, low-voltage electrical system, and control system. The tank consists of a cylindrical body, front and rear end caps, baffles, manhole cover, overflow pipe, cable conduit, and bottom water inlet pipe. When the cleaning vehicle is fully loaded and braking, crossing potholes, over obstacles, or turning, the tank experiences significant inertial force, causing the water inside to sway back and forth and side to side. Water will then overflow from the overflow pipe, spilling onto the road surface, wasting water resources, increasing operating costs, and affecting the vehicle's appearance.

[0029] To address the aforementioned technical issues, such as Figures 1 to 8 As shown, this application provides a sanitation cleaning vehicle, including a tank assembly 3, which includes a tank body 31, a manhole structure, and an overflow pipe 37. A drip-proof structure is integrated at the upper end of the overflow pipe to prevent water in the tank from flowing out of the overflow pipe when the vehicle is braking, going over potholes, going over obstacles, or turning.

[0030] An overflow pipe 37 is installed in the tank body. The upper port of the overflow pipe is located at the top of the tank body. The upper end of the overflow pipe is provided with an anti-drip structure, which covers the upper port of the overflow pipe. The anti-drip structure is fixed to the tank body and is a cavity structure with the opening facing downward. There is a gap between the upper port of the overflow pipe and the inner top of the cavity structure.

[0031] The anti-drip structure is a protective cover 36. The lower part of the protective cover 36 overlaps with the upper end of the overflow pipe. There is a gap between the inner wall of the protective cover and the outer edge of the upper end of the overflow pipe. After the tank is filled, the water in the tank can enter the overflow pipe through the gap and overflow normally.

[0032] This sanitation cleaning vehicle is reasonably designed. The overflow pipe and protective cover form an anti-drip structure. The upper end of the overflow pipe is moved down as a whole, and a protective cover is added to the upper end. There is space between the top of the protective cover and the upper end of the overflow pipe, which can prevent water that shakes in the tank during vehicle transfer from flowing out of the overflow pipe and avoid water waste. In addition, the overflow pipe and protective cover are integrated, which is convenient for layout and fixation, and the structure is stable and reliable.

[0033] In some embodiments, the top of the tank is provided with a manhole structure, and the protective cover is fixed to the top of the tank and set by the manhole structure; or the protective cover and the manhole structure are integrated together to form an integral modular structure, which facilitates layout and installation.

[0034] The manhole structure includes a manhole cover 32, a sealing ring 33, a filter screen 34, and a manhole ring 35; the top of the tank is provided with a circular opening, and the manhole ring is welded and fixed to the circular opening. A top water inlet 9 is formed inside the manhole ring, through which water is added from the top. The manhole ring has a filter screen 34 inside, and a support frame is provided below the filter screen inside the manhole ring. In some embodiments, the support frame is a ring structure with intersecting support bars inside the ring structure, which can provide reliable support for the filter screen and prevent damage when water is added.

[0035] The ring structure is a ring plate with a flanged structure on the outer edge. The flanged structure is fixedly connected to the inner wall of the manhole ring. The end of the support bar is fixed to the ring plate, and the filter screen is fixed to the ring plate and the support bar. The structure is stable and reliable.

[0036] A manhole cover is provided at the upper end of the manhole ring. A sealing ring is provided at the upper end of the manhole ring or the edge of the manhole cover. One side of the manhole cover is hinged to the manhole ring, and a clamping structure is provided on the other side of the manhole cover. The clamping structure can adopt an existing structure.

[0037] like Figure 2 As shown, the manhole structure and the protective cover are positioned close to each other; furthermore, a connecting structure is provided between the manhole ring of the manhole structure and the top of the protective cover. The connecting structure can be a connecting frame or a connecting rib, and the structure is stable and reliable.

[0038] In some embodiments, the protective cover 36 is a square cover or a cylindrical cover; if the protective cover is designed as a square cover, a square opening is opened at the top of the tank, the square cover is embedded in the square opening, and the outer edge of the square cover is welded to the edge of the square opening; if the protective cover is designed as a cylindrical cover, a circular opening is opened at the top of the tank, the cylindrical cover is embedded in the circular opening, and the outer edge of the cylindrical cover is welded to the edge of the circular opening; this facilitates arrangement and installation.

[0039] In some embodiments, a circular hole is opened at the top of the tank, and a protective cover is welded and fixed inside the circular hole. The lower end of the protective cover is located inside the tank. The vertical axis of the protective cover is coaxial with the vertical axis of the overflow pipe, and the gap between the inner wall of the protective cover and the outer edge of the overflow pipe is uniform.

[0040] In some embodiments, such as Figure 6 As shown, the lower port of the protective cover 36 is provided with an inner plate 3601, and a central hole is provided at the center of the inner plate. The upper end of the overflow pipe passes through the central hole. A water inlet hole 3602 is provided on the inner plate between the central hole and the edge.

[0041] The inner edge of the central hole of the inner plate of the protective cover is fixedly connected to the outer edge of the overflow pipe, which can fix the upper end of the overflow pipe, making the structure stable and reliable. Furthermore, the inner edge of the central hole of the inner plate of the protective cover is provided with an inner flange, and the outer edge of the overflow pipe is provided with an annular groove. The inner flange and the annular groove cooperate to make installation simple and accurate.

[0042] In some embodiments, the inner plate of the protective cover is an annular plate, and the water inlet is a set of arc holes arranged circumferentially along the inner plate of the protective cover.

[0043] The inner panel of the protective cover consists of two annular plates arranged vertically, with the water inlet holes on the two annular plates staggered; this further enhances the anti-drip effect.

[0044] This application integrates a downward-facing, cavity-type protective cover with a drip-proof structure at the upper end of the overflow pipe, optimizing the traditional straight-through water outlet structure of the overflow pipe. The protective cover is positioned over the upper end of the overflow pipe with a uniform gap between them. When the tank is full, water can normally enter the overflow pipe through this gap to complete the overflow operation, preserving the basic pressure relief and anti-overflow functions of the overflow pipe without affecting the original water filling and storage logic of the equipment. Simultaneously, during vehicle braking, driving over potholes, over obstacles, or turning, when the water in the tank experiences inertial sloshing, the protective cover effectively prevents the sloshing water from directly entering the overflow pipe, completely eliminating the problem of water spilling onto the road surface. This significantly reduces ineffective water consumption, lowering the water resource consumption cost of sanitation operations; it also avoids water residue and water pollution on the road surface, standardizes the appearance of sanitation vehicles, improves the overall image of sanitation operations, reduces the workload of secondary road cleaning, and effectively lowers overall operating costs.

[0045] The anti-drip protective cover is highly integrated with the tank body and overflow pipe, and can be fitted to the manhole structure on the top of the tank, or even integrated into a single module. This integrated design significantly simplifies the layout of components on the top of the tank, reduces the individual fixing process of scattered parts, lowers the difficulty of equipment production assembly and subsequent maintenance, and improves production assembly efficiency. Simultaneously, the protective cover can be fixed to the tank opening by welding, and the precise fit between the inner plate of the protective cover and the overflow pipe provides precise positioning and stable support for the upper end of the overflow pipe, effectively improving the installation firmness of the overflow pipe and preventing displacement or loosening caused by vehicle vibration. The overall structure has high strength and good stability, is suitable for the complex road operation conditions of cleaning trucks, and has a longer service life. Furthermore, the protective cover can be designed in various structural forms such as square and cylindrical to adapt to different tank structure layouts, enhancing equipment adaptability and versatility.

[0046] The manhole structure at the top of the tank has been optimized by adding a filter screen and a circular support frame with support strips inside the manhole ring. Through a design featuring flanged fixing and multi-point support, the filter screen is provided with stable support. During top water filling operations, this effectively buffers the impact of water flow, preventing the filter screen from deforming or breaking under water pressure. This significantly improves the stability and durability of the water filling structure, ensuring smooth water filling operations. Simultaneously, it filters impurities from the water, preventing them from entering the tank and water system, thus protecting the vehicle's water system equipment.

[0047] The combination of a hinged manhole cover, a clamping structure, and a sealing ring design ensures the sealing performance of the manhole structure, preventing water seepage and leakage during tank storage and operation, further enhancing the overall sealing and protection of the tank, and eliminating additional leakage risks. Simultaneously, the manhole structure and protective cover can be integrated through connecting frames and ribs, further strengthening the integrity and rigidity of the tank top structure and improving the overall tank structure's resistance to vibration and deformation.

[0048] By incorporating an inner plate with a central hole and circumferential arc-shaped water inlet at the lower port of the protective cover, and employing a double-layered annular inner plate with staggered water inlets, a multi-level buffer protection structure is formed. A single-layer inner plate can divert water flow and block large-scale water sloshing, while the double-layered staggered structure further weakens the impact of water sloshing, preventing water from entering the overflow pipe layer by layer. This significantly improves the protection against dripping and spilling, completely eliminating the risk of leakage under complex driving conditions, resulting in superior structural protection performance and a higher fault tolerance rate.

[0049] The protective cover and the overflow pipe are precisely positioned and assembled by the interlocking structure of the inner flange of the inner plate and the annular groove of the overflow pipe. This effectively avoids problems such as uneven gaps and protective failure caused by assembly deviations. The assembly is simple and the positioning is accurate. It not only ensures the uniformity of the overflow gap and ensures that the normal overflow function is not affected, but also maximizes the structural function of anti-shaking and anti-drip, achieving dual optimization of functionality and assembly.

[0050] like Figures 1 to 8 As shown, a preferred specific example of this application is: A cleaning truck with anti-drip function includes a cleaning truck chassis 1, a tank assembly 3, a water system 4, an air system 5, a low-voltage electrical system 2, and a control system 6. The tank is composed of a cylindrical body, front and rear end caps, baffles, a manhole cover, an overflow pipe, a protective cover, a cable conduit, and a bottom water inlet pipe 7. The overflow pipe and the protective cover form an anti-drip device. The overflow pipe has its overflow port removed and is lowered. A protective cover is added to the upper end. The protective cover is welded to the overflow pipe. There is space between the top of the protective cover and the upper end of the overflow pipe. The bottom of the protective cover and the overflow pipe overlap in a section.

[0051] The above structure effectively solves the leakage problem during the transportation of the cleaning truck. Water filling for the cleaning truck generally involves two methods: bottom filling and top filling. Bottom filling involves connecting one end of a fire hose to a highway fire hydrant and the other end to the water inlet pipe at the bottom of the cleaning truck's tank. Water is then supplied to the tank through the highway fire hydrant. The water pressure standard for highway fire hydrants (i.e., municipal outdoor fire hydrants) is based on the national mandatory engineering construction standards "General Specification for Fire Protection Facilities" (GB 55036-2022) and "Technical Specification for Fire Water Supply and Fire Hydrant Systems" (GB 50974-2014). The normal operating pressure should not be less than 0.14 MPa (approximately 1.4 kgf / cm²) and should not exceed 1 standard atmosphere (101325). When adding water to the bottom of the tank, the manhole cover on the tank body is closed and the manhole cover is pressed tightly against the sealing ring. When the water level reaches the lower edge of the protective cover, the air pressure in the tank body is the same as the air pressure in the overflow pipe. When water is added to the tank, the water compresses the atmosphere inside the tank, and the air pressure inside the tank is greater than the air pressure in the overflow pipe. The water level in the protective cover is higher than the water level inside the tank. When the water level reaches the upper end of the overflow pipe, water overflows from the overflow pipe. When the fire hydrant is closed, the water level inside the tank is lower than the upper end of the overflow pipe. No water can flow out from the overflow pipe when the vehicle is being transported.

[0052] When adding water through the manhole on the top of the tank, open the manhole cover on the top of the tank and align the water outlet of the water filling device with the manhole ring on the top of the tank. When the water level reaches the lower edge of the protective cover, the air pressure in the tank is the same as the air pressure in the overflow pipe. When adding water to the tank, the air pressure in the tank is equal to the air pressure in the overflow pipe. When the water level reaches the upper end of the overflow pipe, water overflows from the overflow pipe. Close the top water filling device. Because the distance between the top of the overflow pipe and the top of the tank is small, a small amount of water can be added. When the top water filling device is closed, the tank is already full of water. At this time, the overflow pipe and the protective cover are full of water and there is no air, which creates a siphon effect. The water in the tank flows out quickly from the overflow pipe until the lower edge of the protective cover. Air enters the overflow pipe, and the siphon effect ends. No water can flow out from the overflow pipe when the vehicle is being transported.

[0053] As the cleaning truck travels from the water filling point to the work point, it drives, brakes, goes over potholes, overcomes obstacles, and turns. The water in the tank moves back and forth and side to side. Because the water level is lower than the top of the overflow pipe, it cannot flow out from the overflow port on the overflow pipe and spills onto the road, wasting water resources.

[0054] like Figure 3 As shown, the tank assembly is equipped with a protective cover. The overflow pipe and the protective cover form an anti-drip structure. The overflow pipe is moved down as a whole, and a protective cover is added to the upper end. The protective cover is welded to the overflow pipe. There is space between the top of the protective cover and the upper end of the overflow pipe. The bottom of the protective cover and the upper part of the overflow pipe overlap.

[0055] like Figure 7As shown, the bottom water filling system involves connecting one end of a fire hose to a highway fire hydrant and the other end to a bottom water inlet pipe 8 on the cleaning truck's tank. Water is added to the tank through the highway fire hydrant, where the water pressure is higher than the standard atmospheric pressure. When water is added from the bottom, the manhole cover on the tank is closed, and the manhole cover is pressed tightly against the sealing ring. When the water level reaches the lower edge of the protective cover, the air pressure in the tank is the same as the air pressure in the overflow pipe. When more water is added to the tank, the water compresses the atmosphere inside the tank, making the air pressure inside the tank greater than the air pressure in the overflow pipe. The water level inside the protective cover is higher than the water level inside the tank. When the water level reaches the upper end of the overflow pipe, water overflows from the overflow pipe. The fire hydrant is then closed. At this time, the water level inside the tank is lower than the upper end of the overflow pipe. When the cleaning truck is driving, braking, going over potholes, over obstacles, or turning, no water can flow out from the overflow pipe.

[0056] like Figure 8 As shown, when adding water through the manhole ring on the top of the tank, open the manhole cover on the top of the tank and align the water outlet of the water filling device with the inside of the manhole ring on the tank. There is a filter screen inside the manhole ring to filter impurities in the water. When the water level reaches the lower edge of the protective cover, the air pressure in the tank is the same as the air pressure in the overflow pipe. When adding water to the tank, the air pressure in the tank and the air pressure in the overflow pipe remain equal. When the water level reaches the upper end of the overflow pipe, water overflows from the overflow pipe. Close the top water filling. Because the distance between the top of the overflow pipe and the top of the tank is small, a small amount of water can still be added. When the top water filling is closed, the tank is already full of water. At this time, the overflow pipe and the protective cover are full of water and there is no air, which creates a siphon effect. The water in the tank flows out quickly from the overflow pipe until the lower edge of the protective cover. Air enters the overflow pipe, and the siphon effect ends. At this time, the water level in the tank is lower than the upper end of the overflow pipe. When the washing vehicle is driving, braking, going over potholes, going over obstacles, or turning, no water can flow out from the overflow pipe.

[0057] The specific structure and working principle of the anti-drip cleaning truck in this application are explained below: Traditional sanitation trucks have overflow pipes with the top of the overflow pipe flush with the top of the tank, allowing water to overflow directly from the pipe opening even with slight agitation, without any buffering or obstruction structure. This solution moves the overflow pipe downwards, eliminating the original exposed overflow port, and lowering the upper end of the overflow pipe to the inside of the top of the tank, creating a safe height difference. This structural modification does not change the core function of the overflow pipe—vertical water flow and pressure relief—but only alters the water entry path, fundamentally reducing the probability of agitated water contacting the overflow pipe opening. Simultaneously, a pre-drilled annular assembly groove on the upper outer edge of the overflow pipe allows for precise engagement and positioning with the inner panel of the protective cover, achieving deviation-free assembly and providing a fundamental guarantee for the stability of the integrated structure.

[0058] The protective cover adopts a downward-facing hollow cavity structure, covering the outer side of the overflow pipe's upper port to form an outer buffer protective ring. It supports multiple structural forms to adapt to different tank layouts, offering exceptional versatility. Firstly, regarding form adaptation, square or cylindrical covers can be customized according to the tank's top structure and installation space requirements: square covers are suitable for square tank openings, fixed through embedded welding to fit the square tank layout; cylindrical covers are suitable for conventional circular tank openings, offering higher coaxiality and more even stress distribution, and are compatible with most standard sanitation tanks. Both structures use an integral welding fixing method, eliminating loose connecting parts, resulting in superior sealing and fixing effects compared to bolted assembly structures. Secondly, regarding clearance fit, a uniform annular gap is reserved between the inner wall of the protective cover and the outer edge of the upper end of the overflow pipe, and an independent buffer cavity is maintained between the inner end face of the top of the protective cover and the upper port of the overflow pipe. When the tank is full of static water, water can smoothly seep into the protective cover cavity through the annular gap and then be discharged from the overflow pipe. This fully preserves the tank's overpressure overflow and full-water pressure relief functions, preventing issues like pressure buildup or inability to fill completely. It is fully compatible with both municipal fire-fighting water pressure filling and manual top-mounted water filling modes. Thirdly, regarding dynamic leak prevention, during vehicle braking, bumping, obstacle crossing, and turning, the water inside the tank experiences lateral and longitudinal inertial swaying. The solid sidewalls of the protective cover directly block the impact of the swaying water on the overflow pipe opening. Simultaneously, the internal cavity buffers the impact of water fluctuations, preventing water from directly entering the overflow pipe. Even if a small amount of water splashes into the protective cover cavity, gravity and the downward-facing structure prevent it from continuously entering the overflow pipe, ultimately returning to the tank interior, completely eliminating water dripping and spillage during driving.

[0059] To further enhance the anti-drip effect under complex working conditions, this solution adds a detachable inner panel structure to the lower port of the protective cover, forming a multi-level protection system consisting of an outer protective cover, a middle buffer cavity, and an inner diversion inner panel. The inner panel adopts a ring-shaped structure with a central hole precisely matching the overflow pipe, and evenly distributed arc-shaped water inlets around the perimeter to achieve uniform water diversion. The single-layer inner panel provides initial blocking and diversion of sloshing water, filtering most of the fluctuating flow. The double-layer staggered ring-shaped inner panel is an upgraded structure, with the arc-shaped water inlets of the two layers staggered circumferentially to form an interlaced water flow barrier, weakening the impact of water sloshing layer by layer, significantly improving the anti-drip tolerance rate, and adapting to extreme and complex working conditions such as bumpy roads, high-speed transport, and emergency braking. Meanwhile, the inner plate's central hole is equipped with an inwardly flanged structure, which forms a snap-fit ​​assembly structure with the outer annular groove of the overflow pipe. This allows for precise positioning without additional welding, ensuring the coaxiality of the overflow pipe and the protective cover, and ensuring a uniform annular water inlet gap. This avoids problems such as excessive local gaps and protective failure caused by assembly deviations. It also provides rigid limiting support for the upper end of the lowered overflow pipe, offsetting the risk of displacement and loosening caused by long-term vehicle vibration, and improving the stability of the pipeline structure.

[0060] Traditional sanitation vehicle manholes only have simple filters without dedicated support structures. During high-pressure water filling, the water flow directly impacts the filter, leading to deformation, breakage, and detachment over time. This allows impurities to enter the tank's water system, clogging pumps, nozzles, and other equipment. This solution adds an integrated support component inside the manhole ring. This support frame structure consists of a flanged circular plate and cross-bracing bars. The circular plate is fixed to the inner wall of the manhole ring via its outer flange, ensuring a secure and evenly distributed load. The cross-bracing bars form a multi-point support structure, providing comprehensive support for the filter above.

[0061] The manhole cover is hinged to the manhole ring on one side for easy opening and closing, while the other side features a clamping and locking structure. Combined with a sealing gasket on the upper part of the manhole ring or the edge of the manhole cover, this ensures a complete seal of the manhole opening. Throughout the tank's water storage, operation, and transportation processes, this effectively prevents water seepage and leakage at the manhole location, mitigating the hidden leakage problems caused by inadequate manhole seals in traditional vehicle models.

[0062] The protective cover is placed close to the manhole structure and can be connected by connecting frames, connecting ribs, and other structures to form an integral module, or even integrated prefabricated module. This extended design has multiple advantages: First, it simplifies the layout of the tank top, reduces scattered fixing points, lowers welding and assembly processes, and improves production and assembly efficiency; second, it strengthens the overall rigidity of the tank top, and offsets the local stress caused by driving vibration and water pressure through structural linkage, preventing deformation and cracking of the tank top; third, it facilitates later inspection and maintenance, and the modular structure allows for quick disassembly, inspection and maintenance of filters and cleaning of overflow pipes by a single person, reducing operation and maintenance costs.

[0063] Furthermore, the protective cover's sidewalls utilize a one-piece stamped annular corrugated structure. The corrugations are uniformly circumferentially arranged flexible pleats, made of corrosion-resistant stainless steel, suitable for the humid, water-rich, and outdoor operating environments of sanitation vehicles. The corrugated structure provides vertical buffering and radial micro-deformation capabilities: when the vehicle bumps or water surges impact the cover, the corrugated pleats can adaptively expand and contract, absorbing the impact energy of the water and the vehicle's vibration stress, preventing rigid contact between the cover and the overflow pipe. This effectively solves the problems of localized dents, uneven gaps, and protective failure that occur with traditional rigid covers after long-term impact. Simultaneously, the one-piece corrugated structure has no seams, ensuring high sealing performance and structural strength, corrosion resistance, and aging resistance, making it suitable for long-term outdoor operations. After deformation, it can autonomously spring back to its original position, maintaining normal gap accuracy and continuously ensuring smooth overflow and leak-proof performance, requiring no subsequent calibration or maintenance.

[0064] Alternatively, the protective cover can have a rigid top ring, a rigid metal inner plate at the bottom, and a flexible polymer composite material for the middle sidewalls that is resistant to high and low temperatures and anti-aging. This integrated molding process achieves a combination of rigidity and flexibility for deformation protection. The flexible sidewalls possess excellent toughness and impact resistance, offering a wider range of buffer deformation compared to an all-metal structure, making them suitable for extreme conditions such as severe bumps and high-frequency vibrations. When the water inside the tank violently shakes or impacts the protective cover laterally, the flexible sidewalls can adaptively expand and contract locally, buffering the impact force of the water from all directions and significantly reducing the load on the overall structure. Simultaneously, the flexible sidewalls do not exert compressive stress on the overflow pipe, ensuring a uniform and stable annular inlet gap and completely avoiding pipe misalignment and jamming problems caused by rigid structure compression. This structure is also lighter, reducing the load on the top of the tank and preventing long-term deformation under pressure.

[0065] To prevent excessive deformation of the protective cover from causing gap misalignment and structural failure, a deformation-limiting protective structure is added to the deformable structure to ensure controllable deformation and stable function. First, limiting protrusions or ribs are evenly distributed circumferentially around the inner side of the protective cover and the outer edge of the overflow pipe, with a standard safety gap reserved. Once the sidewall deforms to the limiting position, it stops, preventing excessive deformation from fitting into the overflow pipe and clogging the inlet gap. Second, the corrugated structure uses an equidistant, uniform corrugated design to ensure consistent circumferential deformation and avoid coaxiality failure caused by unilateral deformation deviation. Third, the thickness and hardness of the flexible sidewall of the rigid-flexible composite structure are parameter-matched to ensure consistent deformation rebound and prevent permanent plastic deformation. Simultaneously, the deformable protective cover is fully compatible with the original double-layer staggered inner plate structure. The deformation buffer structure and the multi-stage water flow barrier structure work together, with the mechanical structure's impact protection and the water flow field's buffer protection being superimposed, further improving the reliability of leak prevention under complex working conditions.

[0066] This sanitation cleaning vehicle integrates a downward-facing cavity-type protective cover at the upper end of the overflow pipe to prevent dripping, completely overcoming the structural drawbacks of traditional straight-through overflow pipes that are prone to leakage. This structure covers the upper end of the overflow pipe with a protective cover, and a uniform flow gap is reserved between the two. This fully preserves the basic pressure relief and overflow prevention functions of the overflow pipe, without interfering with the normal operating logic of bottom pressurization and top open water filling, while also solving the problem of water leakage during vehicle transport by leveraging the structural barrier advantages. Whether using the bottom high-pressure water filling mode or the top manual water filling mode, the equipment can automatically adjust the water level in the tank and the overflow pipe through air pressure balance and siphon effect, so that the water level in the tank after settling is always lower than the top of the overflow pipe. Under complex working conditions such as vehicle braking, bumping, obstacle crossing, and turning, the protective cover can effectively prevent the water in the tank from being directly rushed into the overflow pipe due to inertial shaking, thus eliminating the problem of water dripping or spilling from the overflow outlet onto the road surface from the root, greatly reducing the ineffective waste of water resources, lowering the water cost of sanitation operations, while avoiding the problems of road water accumulation and water pollution, reducing the amount of secondary cleaning work, and optimizing the overall appearance of sanitation operations.

[0067] This anti-drip structure features a highly integrated design, combining excellent protective performance, structural stability, and adaptability to various operating conditions. The protective cover can be designed in various forms, such as square or cylindrical, to suit different tank structures, offering exceptional versatility. It can also be integrated with the manhole structure on the top of the tank, reinforced through connecting structures, or even incorporated into a modular design, significantly simplifying the layout of components on the top of the tank and reducing the difficulty of production assembly and subsequent maintenance. Combined with the annular inner plate structure of single or double-layered staggered water inlets built into the protective cover, a multi-level water buffer and barrier system can be formed, weakening the impact of water sloshing layer by layer, further improving the anti-drip tolerance rate and adapting to various complex road operation scenarios. Meanwhile, relying on the precise engagement structure of the inner plate's inner flange and the overflow pipe's annular groove, the components are precisely positioned and assembled, ensuring a uniform and stable overflow gap. This not only eliminates the problem of protection failure caused by assembly deviations, but also effectively limits and fixes the upper end of the overflow pipe, resisting the loosening and displacement of components caused by long-term vehicle vibration. The overall structure has high strength, good stability, and long service life, achieving multiple balances of anti-drip protection, normal overflow function, and structural reliability.

[0068] The above description is merely an illustration of preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0069] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A street washing vehicle comprising a tank assembly, the tank assembly comprising a tank and an overflow pipe, the overflow pipe being disposed in the tank, characterised in that: The upper end of the overflow pipe is provided with an anti-drip structure, which covers the upper port of the overflow pipe.

2. The sanitation cleaning vehicle as described in claim 1, characterized in that: The anti-drip structure is fixed to the tank body. The anti-drip structure is a cavity structure with the opening facing downwards, and there is a gap between the upper port of the overflow pipe and the inner top of the cavity structure.

3. The sanitation cleaning vehicle as described in claim 2, characterized in that: The anti-drip structure is a protective cover, the lower part of which overlaps with the upper end of the overflow pipe, and there is a gap between the inner wall of the protective cover and the outer edge of the upper end of the overflow pipe.

4. The sanitation cleaning vehicle as described in claim 3, characterized in that: The top of the tank is provided with a manhole structure, and the protective cover is fixed to the top of the tank and set near the manhole structure.

5. The sanitation cleaning vehicle as described in claim 3, characterized in that: The protective cover is a square or cylindrical cover, and the vertical axis of the protective cover is coaxial with the vertical axis of the overflow pipe.

6. The sanitation cleaning vehicle as described in claim 5, characterized in that: The top of the tank has a circular hole, and a protective cover is welded and fixed inside the circular hole. The lower end of the protective cover is located inside the tank.

7. The sanitation cleaning vehicle as described in claim 6, characterized in that: The lower port of the protective cover is provided with an inner plate, and a central hole is provided at the center of the inner plate. The upper end of the overflow pipe is provided through the central hole, and a water inlet hole is provided on the inner plate between the central hole and the edge.

8. The sanitation cleaning vehicle as described in claim 7, characterized in that: The inner plate of the protective cover is an annular plate, and the water inlet is a set of arc holes arranged circumferentially along the inner plate of the protective cover.

9. The sanitation cleaning vehicle as described in claim 7, characterized in that: The inner edge of the central hole of the inner plate of the protective cover is fixedly connected to the outer edge of the overflow pipe.

10. The sanitation cleaning vehicle as described in claim 8, characterized in that: The inner plate of the protective cover consists of two annular plates arranged vertically, with the water inlet holes on the two annular plates being staggered.

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