Large spray cleaning machine

Abstract

The invention discloses a large spraying cleaning machine, and relates to the technical field of industrial part cleaning equipment. The cleaning machine comprises a rack, a cleaning assembly and a water circulation system. According to the cleaning assembly, horizontal sliding-out loading and unloading of a cleaning basket are achieved through a translation assembly, a motor drives a gear and a rack to achieve rotation of the cleaning basket, and cleaning dead corners are eliminated in cooperation with a spraying unit. The water circulation system integrates water filtering and oil removing functions; a water filtering assembly is provided with a quick-release filter screen and a follow-up floating funnel; the oil removal assembly sucks surface oil-containing wastewater through a second water pump, steady flow layering is carried out through a snakelike channel formed by partition plates in the tank and the communicating vessel principle, top-layer oil dirt overflows and is discharged, and lower-layer clear water flows back to the bottom of the water filtering tank through a third water pump. By means of active double-pump circulation and bottom backflow design, static pressure is effectively overcome, secondary pollution is prevented, and the oil-water separation efficiency and equipment maintenance convenience are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of industrial parts cleaning equipment technology, and in particular to a large-scale spray cleaning machine. Background Technology

[0002] In the machining, automotive parts manufacturing, and repair and maintenance industries, workpiece surfaces often adhere to a large amount of cutting fluid, lubricating oil, iron filings, dust, and other impurities. To ensure the accuracy of subsequent assembly or the quality of surface treatment, thorough cleaning of the workpieces is essential. Currently, spray cleaning machines are widely used due to their high cleaning efficiency and wide applicability.

[0003] However, existing spray cleaning machines still suffer from the following significant technical challenges in practical use: Traditional spray cleaning machines mostly employ fixed cleaning baskets or simple conveyor belt structures. When the workpiece has a complex shape, the fixed spray angle makes it difficult to cover all surfaces, easily creating cleaning blind spots. Although some equipment uses rotating spray arms, the cleaning effect is still limited for heavy or stacked workpieces, lacking the relative movement of the workpiece itself. For large or heavy metal workpieces, traditional top-opening or side-opening cleaning machines often require manual entry into the machine compartment for handling, or rely on external cranes for hoisting. Limited operating space not only results in low loading and unloading efficiency but also poses risks of workpiece collisions or safety hazards to operators. During the cleaning process, the cleaning fluid is quickly contaminated by oil on the workpiece surface. Because oil is less dense than water, the oil floats on the surface of the tank. Most cleaning machines lack effective oil-water separation devices or only use simple overflow outlets. When the liquid level fluctuates, the overflow oil removal efficiency is extremely low. Even when equipped with an independent oil removal tank, gravity flow or a single pump circulation is often used. However, in actual operation, to ensure the clean water zone at the bottom of the filter tank remains undisturbed, the return water often needs to be injected into the bottom of the tank. If gravity is used for return alone, it is often insufficient to overcome the static pressure of the liquid inside the tank, leading to poor return flow or even backflow. Floating oil stains, if not removed promptly, will be pumped back into the spray system and re-sprayed onto the workpiece surface, causing secondary pollution and leaving an oil film residue on the cleaned surface. Simultaneously, the cleaning solution deteriorates quickly and requires frequent replacement, increasing environmental treatment costs. During the cleaning solution circulation process, particulate impurities such as iron filings need to be filtered. Existing filters are typically fixed with screws or placed directly in the tank; when the filter becomes clogged and needs cleaning, disassembly is extremely inconvenient, increasing equipment downtime for maintenance.

[0004] In summary, there is an urgent need to develop a rotary spray cleaning machine that can automatically rotate and clean workpieces, facilitate material loading and unloading, and has a high-efficiency, active oil-water separation and circulation system to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention develops a large-scale spray cleaning machine that can automatically rotate for cleaning, facilitates material loading and unloading, and features a highly efficient, active oil-water separation and circulation system.

[0006] The technical solution of this invention to solve the technical problem is as follows: a large-scale spray cleaning machine, comprising: a frame; a cleaning assembly disposed within the frame, the cleaning assembly including a rotatable cleaning basket and a spray unit for spraying the cleaning basket; a water circulation system connected to the spray unit for treating and recycling cleaning wastewater; the water circulation system including a water filtration assembly and an oil removal assembly fluidly connected, and a power device for driving the water circulation; the water filtration assembly for filtering the cleaning wastewater, and the oil removal assembly connected to the water filtration assembly for separating oil and water in the filtered wastewater.

[0007] Preferably, the cleaning assembly further includes a drive unit and a translation component; the translation component includes a support ring and a guide rail, the guide rail is disposed on the support ring, and the bottom of the cleaning basket is provided with rollers that cooperate with the guide rail, so that the cleaning basket can slide out or slide in horizontally relative to the support ring; the drive unit includes a motor and a gear, the support ring is provided with an annular rack, the support ring is rotatably mounted on the frame through guide wheels, and the motor drives the gear to mesh with the annular rack, thereby driving the cleaning basket to rotate.

[0008] Preferably, the spray unit includes an inverted L-shaped spray inlet pipe, with spray heads arranged in an array on the top and side sections of the spray inlet pipe, and a first water pump is installed on the spray inlet pipe.

[0009] Preferably, the water filtration assembly includes a water filtration tank, a water inlet pipe, and a filter screen disposed above the water filtration tank; the filter screen is installed at the top opening of the water filtration tank via a quick-release assembly; the quick-release assembly includes symmetrically arranged side supports and a sliding plate, the filter screen is installed on the sliding plate, the water inlet pipe is detachably connected to the sliding plate and its output end is aligned with the filter screen; each side support is provided with an upper guide strip and a lower limit strip, the width of the lower limit strip is greater than the width of the upper guide strip, the two sides of the sliding plate are slidably supported by the lower limit strips on both sides, and the distance between the two upper guide strips is not less than the width of the sliding plate.

[0010] Preferably, the oil removal assembly includes an oil removal tank, which is equipped with an oil removal water inlet pipe and an oil removal water outlet pipe. Both the oil removal water inlet pipe and the oil removal water outlet pipe are connected to the bottom of the oil removal tank. A second water pump is installed on the oil removal water inlet pipe to transport water from the water filtration assembly to the oil removal tank, and a third water pump is installed on the oil removal water outlet pipe to transport water from the oil removal tank to the water filtration assembly. The oil removal tank is also equipped with an oil discharge structure, which includes a vertically arranged oil outlet pipe. The top opening of the oil outlet pipe is funnel-shaped and located near the top of the oil removal tank. The top of the oil removal water outlet pipe is higher than the top of the third partition and lower than the top of the oil outlet pipe.

[0011] Preferably, the oil removal tank is provided with three partitions, namely a first partition, a second partition, and a third partition; the bottoms of the first partition and the third partition are connected to the bottom of the oil removal tank, and there is a gap between their tops and the top of the oil removal tank; the second partition is located between the first partition and the third partition, the top of the second partition is connected to the top of the oil removal tank, and there is a gap between its bottom and the bottom of the oil removal tank; the first partition, the second partition, and the third partition cooperate to form a serpentine water flow path inside the oil removal tank.

[0012] Preferably, the top of the oil removal tank is provided with a tank cover, and the tank cover is provided with a handle.

[0013] Preferably, the water filtration assembly includes a water filtration tank, in which a floating funnel is provided. The floating funnel is connected to the oil removal inlet pipe via a hose, and the water filtration tank collects the upper layer of oily wastewater through the floating funnel.

[0014] Preferably, the bottom of the oil removal tank is provided with a drain pipe for periodically cleaning the inside of the oil removal tank and discharging wastewater.

[0015] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. The above technical solutions have the following advantages or beneficial effects: 1. This invention incorporates first, second, and third baffles within the oil removal tank, forming a serpentine, meandering water flow path. This design not only extends the residence time of wastewater within the tank but, more importantly, plays a crucial role in rectifying and stabilizing the flow. By forcing the water flow up and down, it effectively buffers the impact of incoming water, eliminates turbulence within the water flow, and maintains a relatively calm liquid surface within the tank. This stable flow environment greatly promotes the upward aggregation of oil droplets, preventing remixing of oil and water due to surface fluctuations, and significantly improving the purity of oil-water separation.

[0016] 2. The clean water treated by the oil removal component is transported back to the filter tank through the oil removal outlet pipe and the third water pump. This invention features a unique bottom-connected design, where clean water is injected from the bottom of the filter tank, rather than being poured from the top as in the traditional method. This design cleverly avoids impacting and disturbing the floating oil layer on top of the filter tank, ensuring that the oil sludge on the top of the filter tank can be continuously and stably collected through the floating funnel. This eliminates the possibility of the stratified oil sludge being dispersed by the returning clean water, achieving closed-loop clean operation of the water circulation system.

[0017] 3. Unlike traditional passive oil removal methods that rely on gravity overflow, this invention utilizes a second water pump to actively draw oily wastewater into the oil removal tank, and a third water pump to actively pump clean water back into the filter tank. This dual-pump design effectively overcomes the static pressure of the liquid during bottom water filling, ensuring smooth water circulation regardless of the water level in the filter tank, and completely solving the technical problems of poor backflow or easy backflow in traditional equipment.

[0018] The filtration assembly incorporates a floating funnel and flexible hose design. The floating funnel automatically rises and falls with changes in the liquid level within the filtration tank, always keeping the suction port at the surface. This adaptive design ensures that regardless of the amount of cleaning fluid lost or how the liquid level fluctuates, the system can accurately extract the highest concentration of oily wastewater from the upper layer, rather than drawing in the clean water from the lower layer, significantly reducing ineffective circulation and improving oil removal concentration.

[0019] 5. The motor, gears, and ring rack work together to rotate the cleaning basket during spraying. Combined with the inverted L-shaped array of spray heads, this creates relative motion between the workpiece and the high-pressure water flow, enabling comprehensive, thorough cleaning of the workpiece's top surface, sides, and complex cavities—significantly superior to traditional stationary cleaning machines.

[0020] 6. The design of the translation component allows the cleaning basket to slide horizontally out of the frame like a drawer. Operators can lift or move workpieces without having to lean into the machine compartment, which facilitates the loading and unloading of heavy workpieces, reduces the labor intensity of workers, and improves operational safety.

[0021] 7. The water filtration assembly adopts a quick-release structure consisting of side supports, guide strips, and limiting strips. When the filter screen accumulates shavings and other impurities and needs cleaning, the operator only needs to disconnect the sliding plate from the water inlet pipe to directly pull out or lift the sliding plate along with the filter screen for cleaning, which greatly shortens the equipment's maintenance downtime and improves production efficiency. Attached Figure Description

[0022] Figure 1 This is a water circulation flow diagram of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is the left view of the present invention; Figure 4 This is a general structural diagram of the present invention; Figure 5 This is a top view of the present invention; Figure 6 This is a diagram illustrating the structure and transmission relationship of the cleaning basket of the present invention; Figure 7 This is a structural diagram of the filter section of the present invention; Figure 8 This is a cross-sectional view of the oil removal component of the present invention; Figure 9 This is a schematic diagram of the overall structure of the oil removal component of the present invention; Figure 10 This is a diagram showing the relationship between the gear and rack transmission. Figure 11 This is a schematic diagram showing the location of the floating funnel.

[0023] The components include: 1. Frame; 2. Cleaning basket; 21. Ring rack; 211. Support ring; 212. Guide wheel; 22. Guide rail; 23. Roller; 3. Motor; 31. Gear; 4. Spray inlet pipe; 41. Spray head; 42. First water pump; 5. Filter tank; 51. Filter inlet pipe; 52. Floating funnel; 6. Filter screen; 61. Side support frame; 611. Upper guide bar; 612. Lower limit bar; 62. Slide plate; 7. Oil removal tank; 71. Tank cover; 72. Handle; 8. Oil removal inlet pipe; 81. Second water pump; 9. Oil outlet pipe; 10. First partition; 11. Second partition; 12. Third partition; 13. Oil removal outlet pipe; 131. Third water pump; 14. Sewage pipe. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0025] Example 1 See Figures 1 to 11 A large-scale spray cleaning machine includes: a frame 1; a cleaning assembly disposed within the frame 1, the cleaning assembly including a rotatable cleaning basket 2 and a spray unit for spraying the cleaning basket 2; a water circulation system connected to the spray unit for treating and recycling cleaning wastewater; the water circulation system including a water filtration assembly and an oil removal assembly in fluid communication and a power device for driving the water circulation; the water filtration assembly is used to filter the wastewater after cleaning, and the oil removal assembly is connected to the water filtration assembly for separating oil and water in the filtered wastewater.

[0026] The cleaning assembly further includes a drive unit and a translation component; the translation component includes a support ring 211 and a guide rail 22, the guide rail 22 is disposed on the support ring 211, and the bottom of the cleaning basket 2 is provided with a roller 23 that cooperates with the guide rail 22, so that the cleaning basket 2 can slide out or slide in horizontally relative to the support ring 211; the drive unit includes a motor 3 and a gear 31, the support ring 211 is provided with an annular rack 21, the support ring 211 is rotatably mounted on the frame 1 through a guide wheel 212, and the motor 3 drives the gear 31 to mesh with the annular rack 21, thereby driving the cleaning basket 2 to rotate.

[0027] The spray unit includes an inverted L-shaped spray inlet pipe 4, with spray heads 41 arranged in an array on the top and side sections of the spray inlet pipe 4, and a first water pump 42 installed on the spray inlet pipe 4.

[0028] The water filtration assembly includes a water filtration tank 5, a water inlet pipe 51, and a filter screen 6 disposed above the water filtration tank 5. The filter screen 6 is installed at the top opening of the water filtration tank 5 via a quick-release assembly. The quick-release assembly includes symmetrically arranged side supports 61 and a sliding plate 62. The filter screen 6 is installed on the sliding plate 62, and the water inlet pipe 51 is detachably connected to the sliding plate 62 with its output end aligned with the filter screen 6. Each side support 61 is provided with an upper guide strip 611 and a lower limit strip 612. The width of the lower limit strip 612 is greater than the width of the upper guide strip 611. The two sides of the sliding plate 62 are slidably supported by the lower limit strips 612 on both sides, and the distance between the two upper guide strips 611 is not less than the width of the sliding plate 62.

[0029] The oil removal assembly includes an oil removal tank 7, which is equipped with an oil removal water inlet pipe 8 and an oil removal water outlet pipe 13. Both the oil removal water inlet pipe 8 and the oil removal water outlet pipe 13 are connected to the bottom of the oil removal tank 7. A second water pump 81 is installed on the oil removal water inlet pipe 8 to transport water from the water filtration assembly to the oil removal tank 7, and a third water pump 131 is installed on the oil removal water outlet pipe 13 to transport water from the oil removal tank 7 to the water filtration assembly. The oil removal tank 7 also has an oil discharge structure, which includes a vertically arranged oil outlet pipe 9. The top opening of the oil outlet pipe 9 is funnel-shaped and located near the top of the oil removal tank 7. The top of the oil removal water outlet pipe 13 is higher than the top of the third partition 12. Furthermore, the special height setting of the oil removal water outlet pipe 13, which is lower than the top of the oil outlet pipe 9, ensures that the communicating vessel formed by the three baffles can work normally and that the water outlet is smooth. If the height of the oil removal water outlet pipe 13 is lower than the top of the third baffle 12, the water that has just passed through the communicating vessel formed by the three baffles will flow away directly, resulting in poor continuity of operation and sometimes sudden water interruption. This ensures that there is still a certain amount of water remaining after filtration stops, allowing operators to perform operations such as connecting to external water or opening external water valves before the remaining water runs dry. If the top of the oil removal water outlet pipe 13 is higher than the top of the oil outlet pipe 9, then clean water cannot be discharged because, according to the principle of communicating vessels, the liquid levels on the left and right sides of the three baffles are the same.

[0030] The oil removal tank 7 has three partitions inside: a first partition 10, a second partition 11, and a third partition 12. The bottoms of the first partition 10 and the third partition 12 are connected to the bottom of the oil removal tank 7, and there is a gap between their tops and the top of the oil removal tank 7. The second partition 11 is located between the first partition 10 and the third partition 12. The top of the second partition 11 is connected to the top of the oil removal tank 7, and there is a gap between its bottom and the bottom of the oil removal tank 7. The first partition 10, the second partition 11, and the third partition 12 cooperate to form a serpentine water flow path inside the oil removal tank 7. A drain pipe 14 is also provided at the bottom of the oil removal tank 7 for periodic cleaning of the interior.

[0031] The top of the oil removal tank 7 is provided with a tank cover 71, and the tank cover 71 is provided with a handle 72.

[0032] The water filtration assembly includes a water filtration tank 5, and a floating funnel 52 is provided inside the water filtration tank 5. The floating funnel 52 is connected to the oil removal water inlet pipe 8 through a hose. The water filtration tank 5 collects the upper layer of oily wastewater through the floating funnel 52.

[0033] Principles and operating procedures At the start of the operation, the drive unit activates: motor 3 meshes with the annular rack 21 on the support ring 211 via gear 31, converting the rotational torque of motor 3 into the horizontal rotational motion of the cleaning basket 2. Simultaneously, the first water pump 42 starts, pressurizing and pumping the clean water source at the bottom of the filter tank 5 to the inverted L-shaped spray inlet pipe 4. The cleaning basket 2 rotates with the workpiece, while the arrayed spray heads 41 remain stationary. This allows the high-pressure water jets to scan the workpiece surface in a spiral trajectory, eliminating cleaning dead zones and covering the top and sides of the workpiece without the need for a complex robotic arm. The mixed waste liquid generated during cleaning falls to the bottom and is guided to the filter screen 6 via the filter inlet pipe 51.

[0034] Waste liquid impacts filter screen 6, utilizing the principle of aperture interception to block solid impurities such as cutting chips onto the filter screen 6, while the liquid passes through the filter screen 6 and falls into the water tank 5, completing the primary solid-liquid separation. When filter screen 6 becomes clogged and needs cleaning, it can be quickly replaced using the cooperation structure between the side support 61 and the sliding plate 62. After the operator disconnects the conduit connection, they push the sliding plate 62 to slide along the lower limit bar 612. Utilizing the geometric feature that the width of the sliding plate 62 is less than the distance between the two upper guide bars 611, once it slides out of the limit area, the sliding plate 62 can be lifted vertically. This design utilizes the elimination of geometric interference to avoid the tedious process of bolt disassembly. The waste liquid in the water tank 5 will exhibit density stratification, with oil floating on the upper layer. The system utilizes the principle of buoyancy to set up a floating funnel 52. The average density design of the floating funnel 52 ensures that it always floats on the liquid surface, guaranteeing that the suction inlet is close to the uppermost layer of the oil-water interface. With the negative pressure generated by the second water pump 81, the surface liquid with the highest oil content is precisely sucked in through the hose and delivered to the oil removal tank 7, avoiding the intake of the lower layer of clean water and improving the efficiency of subsequent separation.

[0035] Oily wastewater is pumped to the bottom of the oil removal tank 7 by the second water pump 81. As water is continuously injected, the liquid level in the oil removal tank 7 gradually rises. The three baffles inside the tank form a serpentine, meandering path. Since the initial settling time has been completed during the water injection, when the liquid level is above the top of the first baffle 10, the lower part is all clear water. As the injection continues, the cross-section of the flow channel changes and the path lengthens as the clear water flows through these baffles, forcing it to change direction. This process greatly consumes the kinetic energy of the water flow, transforming turbulent flow into stable laminar flow, ensuring that the liquid level near the oil removal outlet pipe 13 remains stable, and improving the working efficiency of the oil removal outlet pipe 13. The three baffles form a communicating vessel, ensuring that the clear water at the bottom near the oil removal inlet pipe 8 will continuously flow towards the side near the oil removal outlet pipe 13. The oil near the oil outlet pipe 9 floats to the top and continuously accumulates. When the liquid level reaches the opening height of the funnel-shaped oil outlet pipe 9, the top layer of oil spillage naturally overflows into the oil outlet pipe 9 and is discharged outside the machine. The clean water located at the outlet side of the oil removal tank 7 is drawn by the third water pump 131 and transported back to the filter tank 5 through the oil removal outlet pipe 13. The third water pump 131 provides power to overcome the pipeline resistance and the static pressure of the liquid in the filter tank 5, forcibly injecting clean water into the bottom of the filter tank 5. Bottom injection is chosen to utilize the fluid stratification characteristics. The returned clean water has a high density and directly replenishes the clean water layer in the filter tank 5, avoiding the impact of pouring from above on the upper oil film, thereby maintaining a stable state of oil on top and water on the bottom in the filter tank 5, realizing a virtuous cycle of the entire water system. The lower layer of the filter tank 5 is equipped with a conduit connected to the spray assembly, realizing the recycling of water.

[0036] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Based on the technical solutions of the present invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the present invention.

Claims

1. A large-scale spray cleaning machine, characterized in that, include: A frame (1); a cleaning assembly, disposed within the frame (1), the cleaning assembly including a rotatable cleaning basket (2) and a spray unit for spraying the cleaning basket (2); a water circulation system, connected to the spray unit, for treating and recycling the cleaning wastewater; the water circulation system including a water filter assembly and an oil removal assembly in fluid communication and a power device for driving the water circulation; the water filter assembly is used to filter the wastewater after cleaning, and the oil removal assembly is connected to the water filter assembly for separating oil and water in the filtered wastewater.

2. The large-scale spray cleaning machine according to claim 1, characterized in that, The cleaning assembly further includes a drive unit and a translation assembly; the translation assembly includes a support ring (211) and a guide rail (22), the guide rail (22) is disposed on the support ring (211), and the bottom of the cleaning basket (2) is provided with a roller (23) that cooperates with the guide rail (22), so that the cleaning basket (2) can slide out or slide in horizontally relative to the support ring (211); the drive unit includes a motor (3) and a gear (31), the support ring (211) is provided with an annular rack (21), the support ring (211) is rotatably mounted on the frame (1) through a guide wheel (212), and the motor (3) drives the gear (31) to mesh with the annular rack (21), thereby driving the cleaning basket (2) to rotate.

3. The large-scale spray cleaning machine according to claim 1, characterized in that, The spray unit includes an inverted L-shaped spray inlet pipe (4), and spray heads (41) are arranged in an array on the top and side sections of the spray inlet pipe (4). A first water pump (42) is installed on the spray inlet pipe (4).

4. The large-scale spray cleaning machine according to claim 1, characterized in that, The water filtration assembly includes a water filtration tank (5), a water inlet pipe (51), and a filter screen (6) disposed above the water filtration tank (5). The filter screen (6) is installed at the top opening of the water filtration tank (5) via a quick-release assembly. The quick-release assembly includes symmetrically arranged side support brackets (61) and a sliding plate (62). The filter screen (6) is installed on the sliding plate (62), and the water inlet pipe (51) is detachably connected to the sliding plate (62) with its output end aligned with the filter screen (6). Each side support bracket (61) is provided with an upper guide strip (611) and a lower limit strip (612). The width of the lower limit strip (612) is greater than the width of the upper guide strip (611). The two sides of the sliding plate (62) are slidably supported by the lower limit strips (612) on both sides. The distance between the two upper guide strips (611) is not less than the width of the sliding plate (62).

5. The large-scale spray cleaning machine according to claim 1, characterized in that, The oil removal assembly includes an oil removal tank (7), which is equipped with an oil removal water inlet pipe (8) and an oil removal water outlet pipe (13). The oil removal water inlet pipe (8) and the oil removal water outlet pipe (13) are both connected to the bottom of the oil removal tank (7). The oil removal water inlet pipe (8) is equipped with a second water pump (81) for transporting water from the water filter assembly to the oil removal tank (7). The oil removal water outlet pipe (13) is equipped with a third water pump (131) for transporting water from the oil removal tank (7) to the water filter assembly. The oil removal tank (7) is also equipped with an oil discharge structure, which includes a vertically arranged oil outlet pipe (9). The top opening of the oil outlet pipe (9) is funnel-shaped and located near the top of the oil removal tank (7). The top of the oil removal water outlet pipe (13) is higher than the top of the third partition (12) and lower than the top of the oil outlet pipe (9).

6. The large-scale spray cleaning machine according to claim 5, characterized in that, The oil removal tank (7) is equipped with three partitions, namely the first partition (10), the second partition (11) and the third partition (12); the bottom of the first partition (10) and the third partition (12) are connected to the bottom of the oil removal tank (7), and there is a gap between their tops and the top of the oil removal tank (7); the second partition (11) is located between the first partition (10) and the third partition (12), the top of the second partition (11) is connected to the top of the oil removal tank (7), and there is a gap between its bottom and the bottom of the oil removal tank (7); the first partition (10), the second partition (11) and the third partition (12) cooperate to form a serpentine water flow path in the oil removal tank (7).

7. The large-scale spray cleaning machine according to claim 5, characterized in that, The top of the oil removal tank (7) is provided with a tank cover (71), and the tank cover (71) is provided with a handle (72).

8. The large-scale spray cleaning machine according to claim 5, characterized in that, The water filtration assembly includes a water filtration tank (5), and a floating funnel (52) is provided inside the water filtration tank (5). The floating funnel (52) is connected to the oil removal water inlet pipe (8) through a hose. The water filtration tank (5) collects the upper layer of oily wastewater through the floating funnel (52).

9. The large-scale spray cleaning machine according to claim 5, characterized in that, The bottom of the oil removal tank (7) is provided with a drain pipe (14) for regularly cleaning the inside of the oil removal tank (7) and discharging wastewater.

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