A large-scale suspended ultrasonic composite cleaning device and method for oil tanks

Abstract

This invention discloses a suspended ultrasonic composite cleaning device and method for large fuel tanks, relating to the field of fuel tank cleaning technology. The invention includes an ultrasonic cleaning unit and a mechanical vibration unit. The ultrasonic cleaning unit consists of an outer frame, a cleaning tank, and several ultrasonic transducers. The outer frame is installed on the ground, the cleaning tank is welded inside the outer frame, and the ultrasonic transducers are evenly installed around the cleaning tank. The mechanical vibration unit consists of a lifting bracket, a vibration platform, a steel tooling rack for fixing the fuel tank, several centrifugal vibrators, and ultrasonic vibrating rods. This invention uses a second hydraulic cylinder to control the indentation degree of the elastic reflective part, enabling continuous stepless adjustment of the ultrasonic reflection angle. Without replacing any parts, only the corresponding parameters need to be input into the programmable controller to precisely adjust the ultrasonic reflection direction and coverage area according to the bottom shape, internal structure, and key cleaning areas of different fuel tank models.

Description

Technical Field

[0001] This invention relates to the field of fuel tank cleaning technology, specifically to a large fuel tank suspended ultrasonic composite cleaning device and method. Background Technology

[0002] As core equipment in infrastructure, mining, and logistics, construction machinery relies heavily on fuel tanks and hydraulic oil tanks to ensure stable power transmission and operation. During manufacturing, welding, assembly, use, maintenance, and replacement, solid impurities such as welding slag, iron filings, scale, and dust can easily accumulate on the inner walls of the fuel tanks. If these impurities are not thoroughly cleaned, they can clog fuel filters and scratch high-pressure common rail precision components if they enter the fuel system, and accelerate wear on core components such as pumps, valves, and cylinders if they enter the hydraulic system. Industry data shows that approximately 65% ​​of hydraulic system failures originate from oil contamination, directly leading to abnormal equipment pressure, malfunctions, leaks, and shutdowns, significantly increasing maintenance costs and downtime losses, and severely shortening the overall lifespan of the machine.

[0003] Patent CN110935686B discloses a suspended ultrasonic-low-frequency vibration combined cleaning method. This method causes random changes in the liquid surface of the suspended cleaning tank under forced vibration, suppressing the negative impact of ultrasonic standing waves in the cleaning fluid on cleaning. The device includes an ultrasonic part, a low-frequency vibration part, and a suspended cleaning tank. Two sets of low-frequency signals are provided, which are amplified by a power amplifier to excite low-frequency vibration transducers fixed to the side walls of the two sets of cleaning tanks, causing resonance between the two sets of relatively vertical side walls. The differential frequency vibration of the low-frequency vibration causes liquid sloshing, resulting in unstable sloshing, chaotic fluctuations and breakage of the cleaning fluid. The liquid surface randomly reflects ultrasonic waves to disturb the position of ultrasonic standing waves in the cleaning fluid, making cleaning more uniform and extending the life of the cleaned items. During side wall resonance, the cleaning fluid splashes and forms a backflow between the side wall, top cover and cleaning fluid, which also removes air bubbles in the cleaning tank. Under suitable conditions, one set of low-frequency vibration can be omitted.

[0004] The patent and existing technologies have the following technical problems in practical use:

[0005] In the cleaning applications of large engineering oil tanks, existing ultrasonic cleaning devices suffer from a long-standing, unresolved industry-wide problem: insufficient and unevenly distributed ultrasonic energy at the bottom of the tank, resulting in persistent cleaning blind spots in the complex bottom structure. When using simple four-sided ultrasonic cleaning, the energy of the ultrasonic waves attenuates exponentially with increasing propagation distance in the liquid medium. For cleaning tanks of large engineering oil tanks with a volume exceeding 500L and a depth exceeding 1.5m, ultrasonic transducers can typically only be placed on the four side walls of the tank. The ultrasonic waves emitted by the side wall transducers need to travel several meters through the cleaning fluid to reach the bottom of the tank. At this point, the ultrasonic energy attenuates, the cavitation effect is significantly weakened, and it is impossible to effectively remove firmly attached weld slag and oxide scale.

[0006] Patent application CN110446564A discloses an ultrasonic cleaning apparatus and an ultrasonic cleaning method. The ultrasonic cleaning apparatus includes: a treatment tank containing a cleaning liquid for cleaning an object to be cleaned, the object being cleaned being immersed in the treatment tank; an ultrasonic application mechanism for applying ultrasonic waves to the cleaning liquid held inside the treatment tank; and a curved member opposite to the vibration surface of the ultrasonic application mechanism and located within a range defined by a predetermined inclination angle extending outward from the normal direction at the end of the vibration surface, the curved member being held on the wall and / or bottom surface of the treatment tank, the curved member having a convex surface, the convex surface having at least a convex bend having a spherical or non-spherical surface shape.

[0007] The curved components in this solution are fixedly installed on the walls and bottom of the treatment tank, and their reflection angle and focusing position are constant. However, the bottom structure of large engineering oil tanks is extremely diverse: there are different bottom shapes such as flat, arc, and conical; different internal structures such as single-partition, multi-partition, and crisscrossing reinforcing ribs; and oil drains and sewage outlets located in different positions such as the center, corners, or side walls. For different models of oil tanks, the areas requiring focused ultrasonic waves are completely different. A fixed convex curved surface can only focus ultrasonic waves to a pre-set fixed point or a small area. For most of the bottom space outside this area, not only is it impossible to increase the energy, but the energy in other areas will be further reduced because the energy is over-concentrated at the focal point, forming a larger cleaning blind spot. Even for the same model of oil tank, dimensional deviations due to manufacturing tolerances will cause the actual focal point to deviate from the design position, significantly reducing the cleaning effect. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a large-scale suspended ultrasonic composite cleaning device and method for oil tanks.

[0009] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0010] A large-scale suspended ultrasonic composite cleaning device for oil tanks includes an ultrasonic cleaning unit and a mechanical vibration unit. The ultrasonic cleaning unit consists of an outer frame, a cleaning tank and several ultrasonic transducers. The outer frame is installed on the ground, the cleaning tank is welded inside the outer frame, and several ultrasonic transducers are evenly installed around the cleaning tank.

[0011] The mechanical vibration unit consists of a hoisting bracket, a vibration platform, a steel tooling rack for storing the oil tank, several centrifugal vibrators, and an ultrasonic vibrating rod. The hoisting bracket is located directly above the cleaning tank. The vibration platform is mounted on the hoisting bracket by four sets of starting springs. The tooling rack is located below the hoisting bracket. Several centrifugal vibrators are mounted on the top of the vibration platform. The ultrasonic vibrating rod is inserted into the oil tank through the filling port and is suspended below the hoisting bracket by a steel wire.

[0012] The bottom of the cleaning tank is open, and a piston frame is slidably connected inside the cleaning tank. A sealing ring is provided on the outside of the piston frame, and an elastic reflective inner liner is provided inside the piston frame. Four sets of first hydraulic cylinders and one set of second hydraulic cylinders are fixedly installed on the inner bottom of the outer frame. The telescopic ends of the four sets of first hydraulic cylinders are connected to the four corners of the bottom of the piston frame to control the lifting and lowering of the piston frame. The telescopic ends of the second hydraulic cylinders are connected to the center of the bottom of the elastic reflective inner liner to change the reflection angle of the elastic reflective inner liner.

[0013] Furthermore, a rubber buffer block is provided at the bottom of the hoisting bracket.

[0014] Furthermore, the starting spring is an air spring.

[0015] Furthermore, the centrifugal vibrator adopts an adjustable speed pneumatic centrifugal vibrating motor.

[0016] Furthermore, a programmable controller is installed on the outside of the outer frame. The programmable controller is used to coordinate and control the power and frequency of the ultrasonic transducer, ultrasonic vibrating rod and centrifugal vibrator, and can set the cleaning sequence.

[0017] Furthermore, a mesh plate is provided at the bottom of the tooling rack, a baffle is slidably connected to the tooling rack, and a limiting block is provided on the tooling rack to limit the downward position of the baffle.

[0018] Furthermore, the elastic reflective liner consists of an upper elastic reflective part and a lower elastic support mesh part. The elastic reflective part is connected to the piston frame through an elastic telescopic part, and the elastic force of the elastic telescopic part is greater than the elastic force of the elastic reflective part.

[0019] Furthermore, the elastic support mesh is hollow and has connecting pipes on both sides for injecting low-melting-point alloy. The bottom of the elastic support mesh is provided with heating wire and cooling pipe. The cooling pipe and heating wire are alternately fixed to the bottom of the elastic support mesh by clamps and are staggered with the mesh openings of the elastic support mesh. The cooling pipe is made of metal corrugated expansion tube, and the outer layer of the heating wire is provided with a metal corrugated expansion tube protective layer.

[0020] A suspended ultrasonic composite cleaning method for large oil tanks includes the following steps:

[0021] S1. Clamp the oil tank at the bottom of the tooling rack, and insert the ultrasonic vibrator into the oil tank through the filling port. Then lift the hoisting bracket, and the hoisting bracket will lower the oil tank to below the cleaning liquid level.

[0022] S2. The control system simultaneously starts the ultrasonic transducer, ultrasonic vibrator and centrifugal vibrator. The power of the ultrasonic transducer is set to 80%, the power of the ultrasonic vibrator is 1.5KW, and the frequency of the centrifugal vibrator is set to 25Hz. They work together for 15 minutes to complete the cleaning of the inside and outside of the oil tank.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention controls the indentation degree of the elastic reflective part through a second hydraulic cylinder, enabling continuous stepless adjustment of the ultrasonic wave reflection angle. Without replacing any parts, only the corresponding parameters need to be input into the programmable controller to precisely adjust the ultrasonic wave reflection direction and coverage area according to the bottom shape (flat, arc-shaped, conical), internal structure (single partition, multiple partitions, longitudinal and transverse reinforcing ribs), and key cleaning areas (oil drain port, weld seam, groove) of different oil tank models. One device can meet the cleaning needs of all models of large oil tanks in an enterprise.

[0025] 2. During the cleaning process, this invention allows for dynamic reciprocating extension and retraction of the second hydraulic cylinder, causing the degree of concavity of the elastic reflective part to change in real time. This enables the ultrasonic reflection focus to continuously scan the entire bottom area of ​​the oil tank, completely eliminating the drawback of a fixed curved surface that can only focus on a single, narrow area. Even for special engineering oil tanks with extremely complex bottom structures, it ensures that every corner receives sufficient and uniform ultrasonic energy, truly achieving thorough cleaning without blind spots.

[0026] 3. The present invention, in conjunction with the fully open design of the bottom of the cleaning tank and the liftable piston frame structure, controls the piston frame to descend and exit the cleaning tank after cleaning. All deposited impurities can be quickly and completely discharged by gravity, leaving no dead corners and completely avoiding the risk of secondary contamination of the cleaned oil tank. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the oil tank hoisting and cleaning process of the present invention;

[0028] Figure 2 This is a schematic diagram of the mechanical vibration unit structure of the present invention;

[0029] Figure 3 This is a cross-sectional view of the ultrasonic cleaning unit of the present invention;

[0030] Figure 4 This is a schematic diagram of the elastic reflective inner liner structure of the present invention.

[0031] Reference numerals: 1. Outer frame; 2. Cleaning tank; 3. Ultrasonic transducer; 4. Programmable controller; 5. Lifting bracket; 6. Vibration platform; 7. Vibration spring; 8. Tooling rack; 81. Mesh plate; 82. Baffle frame; 9. Centrifugal vibrator; 10. Ultrasonic vibrator; 11. Rubber buffer block; 12. First hydraulic cylinder; 13. Piston frame; 14. Sealing ring; 15. Elastic reflective inner liner; 151. Elastic reflective part; 152. Elastic support mesh part; 153. Elastic telescopic part; 16. Second hydraulic cylinder. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] Example 1, as Figures 1-4 As shown, a large oil tank suspended ultrasonic composite cleaning device includes an ultrasonic cleaning unit and a mechanical vibration unit. The ultrasonic cleaning unit consists of an outer frame 1, a cleaning tank 2 and several ultrasonic transducers 3. The outer frame 1 is installed on the ground, the cleaning tank 2 is welded inside the outer frame 1, and several ultrasonic transducers 3 are evenly installed around the cleaning tank 2.

[0034] The mechanical vibration unit consists of a hoisting bracket 5, a vibration platform 6, a steel tooling rack 8 for storing the oil tank, several centrifugal vibrators 9, and an ultrasonic vibrating rod 10. The hoisting bracket 5 is located directly above the cleaning tank 2. The vibration platform 6 is mounted on the hoisting bracket 5 by four sets of starting springs 7. The tooling rack 8 is located below the hoisting bracket 5. Several centrifugal vibrators 9 are mounted on the top of the vibration platform 6. The ultrasonic vibrating rod 10 is inserted into the oil tank through the filling port and is suspended below the hoisting bracket 5 by steel wire.

[0035] A rubber buffer block 11 is provided at the bottom of the hoisting bracket 5.

[0036] 400 ultrasonic transducers 3 with a power of 60W are evenly installed around the perimeter of the cleaning tank 2.

[0037] The starting spring 7 is an air spring.

[0038] Centrifugal vibrator 9 uses an adjustable speed pneumatic centrifugal vibrating motor.

[0039] A programmable controller 4 is installed on the outside of the outer frame 1. The programmable controller 4 is used to coordinate and control the power and frequency of the ultrasonic transducer 3, the ultrasonic vibrating rod 10 and the centrifugal vibrator 9, and can set the cleaning sequence.

[0040] The bottom of the tooling rack 8 is provided with a mesh plate 81, and a baffle 82 is slidably connected to the tooling rack 8. A limit block is provided on the tooling rack 8 to limit the downward position of the baffle 82.

[0041] Cleaning steps: Push the baffle frame 82 upwards and slide it upwards. Then, place the oil tank into the tooling rack 8. Next, pull the baffle frame 82 downwards until it reaches the limit block position. The baffle frame 82 blocks the oil tank to prevent it from falling and will not fall due to vibration during the cleaning process. Then, insert the ultrasonic vibrator 10 into the oil tank through the filling port. Then, control the lifting bracket 5 to descend (the lifting bracket 5 uses a gantry crane to control the lateral movement and controls the lifting through a linear slide rail module). The lifting bracket 5 drives the oil tank to descend below the cleaning liquid surface. The ultrasonic transducer 3 generates ultrasonic waves, and the centrifugal vibrator 9 causes the vibration platform 6, tooling rack 8, and oil tank to generate mechanical vibration. The programmable controller 4 matches and coordinates the ultrasonic parameters (frequency, power) and mechanical vibration parameters (frequency, amplitude) to achieve the best cleaning effect. The composite cleaning method of applying ultrasonic vibration and overall mechanical vibration to large oil tanks can realize fully automated and efficient cleaning of large engineering oil tanks and meet the assembly cleanliness requirements.

[0042] The present invention can also be equipped with a swing device outside the outer frame 1 to make the outer frame 1 and the cleaning tank 2 swing. The frequency can be adjusted to 10-20 times per minute and the swing amplitude can be adjusted to 100-150mm, thereby increasing its effect.

[0043] Example 2, based on the above examples, further includes an open bottom for the cleaning tank 2, a piston frame 13 slidably connected inside the cleaning tank 2, a sealing ring 14 on the outside of the piston frame 13, an elastic reflective inner liner 15 inside the piston frame 13, and four sets of first hydraulic cylinders 12 and one set of second hydraulic cylinders 16 fixedly installed at the bottom of the outer frame 1. The telescopic ends of the four sets of first hydraulic cylinders 12 are connected to the four corners of the bottom of the piston frame 13 to control the lifting and lowering of the piston frame 13. The telescopic ends of the second hydraulic cylinders 16 are connected to the center of the bottom of the elastic reflective inner liner 15 to change the reflection angle of the elastic reflective inner liner 15.

[0044] The elastic reflective inner liner 15 is composed of an upper elastic reflective part 151 and a lower elastic support mesh part 152. The elastic reflective part 151 is connected to the piston frame 13 through an elastic telescopic part 153. The elastic force of the elastic telescopic part 153 is greater than the elastic force of the elastic reflective part 151.

[0045] The elastic reflective part 151 is made of 304 / 316L stainless steel elastic sheet (with arc-shaped pre-compression elastic structure), with a thickness of 0.8 to 1.5 mm. Features: high ultrasonic reflectivity, resistant to cleaning liquid, oil, and rust, good elasticity, can be bent to form an inner concave arc surface, can elastically deform and change angle after being stressed, automatically reset after unloading, simple processing, and convenient welding and arc pressing.

[0046] This embodiment is mainly for cleaning oil tanks with complex bottoms. Since the ultrasonic transducers 3 are arranged around the cleaning tank 2, it is difficult to obtain effective and uniform ultrasonic action at the bottom of the oil tank, which may not be able to completely clean oil tanks with complex bottoms.

[0047] Therefore, by adding an elastic reflective inner liner 15 at the bottom, the ultrasonic waves from the sides are directionally reflected by the bottom elastic reflective inner liner 15, so that the ultrasonic waves can act evenly on the bottom of the oil tank. During the cleaning process, the extension end of the second hydraulic cylinder 16 is controlled to descend, and the second hydraulic cylinder 16 applies a downward pulling force to the elastic reflective part 151. Since the elastic force of the elastic extension part 153 is greater than that of the elastic reflective part 151, the elastic reflective part 151 first concaves inward (when it concaves inward, the periphery of the elastic reflective part 151 will contract inward). Then, the elastic extension parts 153 around the elastic reflective part 151 are stretched inward (the elastic extension part 153 occupies a small area and has little impact on the ultrasonic wave reflecting surface). The elastic support mesh part 152 at the bottom and the elastic reflective part 151 form a composite structure, which improves the support performance and elasticity of the elastic reflective part 151. By changing the degree of concavity of the elastic reflective part 151, the reflection angle can be changed, so that even complex oil tank angles can be thoroughly cleaned, resulting in a better cleaning effect.

[0048] Because the bottom of the cleaning tank 2 is open, the control piston frame 13 can be withdrawn from the cleaning tank 2 to quickly drain the sewage and make the cleaning fluid replacement highly efficient.

[0049] Example 3, based on the above examples, further includes a hollow design for the elastic support mesh 152, with connecting pipes on both sides for injecting a low-melting-point alloy, using a bismuth-based quaternary alloy with a melting point of 70°C. The cleaning fluid temperature is generally controlled at 30-40°C, providing a supercooling of nearly 30°C to ensure rapid solidification. A heating wire and cooling pipe are installed at the bottom of the elastic support mesh 152. The cooling pipe and heating wire are alternately and side-by-side fixed to the bottom of the elastic support mesh 152 by clamps, and are staggered from the mesh openings of the elastic support mesh 152. The cooling pipe uses a corrugated metal expansion tube, and the outer layer of the heating wire is protected by a corrugated metal expansion tube. The clamps are high-temperature resistant silicone clamps. The corrugated metal expansion tube not only allows for rapid heat or cold transfer but also does not affect the bending of the elastic support mesh 152.

[0050] For oil tanks requiring high cleaning intensity, the required ultrasonic energy / intensity is higher. Therefore, a simple composite structure of elastic support mesh 152 and elastic reflector 151 may absorb some ultrasonic waves, affecting transmission efficiency. This embodiment employs an intelligent elastic support mesh 152 structure. After adjustment, a bismuth-based quaternary alloy at 80-90°C is rapidly injected into the elastic support mesh 152. Rapid cooling after injection forms a rigid support, reducing ultrasonic absorption. When further adjustment is needed, the elastic reflector 151 is restored and moved away from the elastic support mesh 152, isolating the cleaning fluid from it. A heating device (such as heating wires distributed along the bottom of the elastic support mesh 152) is then used to heat the elastic support mesh 152. Heating to 70°C softens the elastic support mesh 152, allowing for continued adjustment. After adjustment, rapid cooling is achieved using cooling pipes. The entire process has minimal impact on the cleaning fluid temperature and does not affect normal cleaning. The simple elastic support mesh section 152 and the intelligent elastic support mesh section 152 can be flexibly selected according to the actual use environment.

[0051] Example 4: A suspended ultrasonic composite cleaning method for large oil tanks, comprising the following steps:

[0052] S1. Clamp the oil tank at the bottom of the tooling rack 8, and insert the ultrasonic vibrator 10 into the oil tank through the filling port. Then lift the hoisting bracket 5, and the hoisting bracket 5 will lower the oil tank to below the cleaning liquid level.

[0053] S2. The control system simultaneously starts the ultrasonic transducer 3, ultrasonic vibrating rod 10 and centrifugal vibrator 9. The power of ultrasonic transducer 3 is set to 80%, the power of ultrasonic vibrating rod 10 is 1.5KW, and the frequency of centrifugal vibrator 9 is set to 25Hz. They work together for 15 minutes to complete the cleaning of the inside and outside of the oil tank and meet the assembly cleanliness requirements.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-scale suspended ultrasonic composite cleaning device for oil tanks, comprising an ultrasonic cleaning unit and a mechanical vibration unit, characterized in that, The ultrasonic cleaning unit consists of an outer frame (1), a cleaning tank (2) and several ultrasonic transducers (3). The outer frame (1) is installed on the ground, the cleaning tank (2) is welded inside the outer frame (1), and several ultrasonic transducers (3) are evenly installed around the cleaning tank (2). The mechanical vibration unit consists of a hoisting bracket (5), a vibration platform (6), a steel tool rack (8) for storing the oil tank, several centrifugal vibrators (9) and an ultrasonic vibrating rod (10). The hoisting bracket (5) is located directly above the cleaning tank (2). The vibration platform (6) is installed on the hoisting bracket (5) by four sets of starting springs (7). The tool rack (8) is set below the hoisting bracket (5). Several centrifugal vibrators (9) are installed on the top of the vibration platform (6). The ultrasonic vibrating rod (10) is inserted into the oil tank through the filling port. The ultrasonic vibrating rod (10) is suspended below the hoisting bracket (5) by steel wire. The bottom of the cleaning tank (2) is open. A piston frame (13) is slidably connected inside the cleaning tank (2). A sealing ring (14) is provided on the outside of the piston frame (13). An elastic reflective inner liner (15) is provided inside the piston frame (13). Four sets of first hydraulic cylinders (12) and one set of second hydraulic cylinders (16) are fixedly installed on the inner bottom of the outer frame (1). The telescopic ends of the four sets of first hydraulic cylinders (12) are connected to the four corners of the bottom of the piston frame (13) to control the lifting and lowering of the piston frame (13). The telescopic ends of the second hydraulic cylinders (16) are connected to the center of the bottom of the elastic reflective inner liner (15) to change the reflection angle of the elastic reflective inner liner (15). The elastic reflective inner liner (15) is composed of an upper elastic reflective part (151) and a lower elastic support mesh part (152). The reflector (151) is connected to the piston frame (13) through the elastic telescopic part (153). The elastic force of the elastic telescopic part (153) is greater than that of the elastic reflector (151). During the cleaning process, the telescopic end of the second hydraulic cylinder (16) is controlled to descend, and the second hydraulic cylinder (16) gives the elastic reflector (151) a downward pulling force. The elastic support mesh part (152) is hollow and has connecting pipes on both sides for injecting low melting point alloy. The bottom of the elastic support mesh part (152) is provided with heating wire and cooling pipe. The cooling pipe and heating wire are alternately fixed and installed at the bottom of the elastic support mesh part (152) by clamps, and are staggered with the mesh of the elastic support mesh part (152). The cooling pipe adopts a metal corrugated telescopic tube, and the outer layer of the heating wire is provided with a metal corrugated telescopic tube protective layer.

2. The large-scale oil tank suspended ultrasonic composite cleaning device according to claim 1, characterized in that, The bottom of the hoisting bracket (5) is provided with a rubber buffer block (11).

3. The large-scale oil tank suspended ultrasonic composite cleaning device according to claim 2, characterized in that, The starting spring (7) is an air spring.

4. The large-scale oil tank suspended ultrasonic composite cleaning device according to claim 3, characterized in that, The centrifugal vibrator (9) is a speed-adjustable pneumatic centrifugal vibrating motor.

5. A large-scale oil tank suspended ultrasonic composite cleaning device according to claim 4, characterized in that, A programmable controller (4) is installed on the outside of the outer frame (1). The programmable controller (4) is used to coordinate and control the power and frequency of the ultrasonic transducer (3), ultrasonic vibrating rod (10) and centrifugal vibrator (9), and can set the cleaning sequence.

6. A large-scale oil tank suspended ultrasonic composite cleaning device according to claim 5, characterized in that, The bottom of the tool rack (8) is provided with a mesh plate (81), and a baffle (82) is slidably connected on the tool rack (8). A limit block is provided on the tool rack (8) to limit the downward position of the baffle (82).

7. A method for suspended ultrasonic composite cleaning of large oil tanks, employing a suspended ultrasonic composite cleaning device for large oil tanks as described in any one of claims 1-6, characterized in that... Includes the following steps: S1. Clamp the oil tank at the bottom of the tool rack (8), and insert the ultrasonic vibrator (10) into the oil tank from the filling port. Then lift the hoisting bracket (5), and the hoisting bracket (5) will drive the oil tank down to below the cleaning liquid level. S2. The control system simultaneously starts the ultrasonic transducer (3), ultrasonic vibrator (10) and centrifugal vibrator (9). The power of the ultrasonic transducer (3) is set to 80%, the power of the ultrasonic vibrator (10) is 1.5KW, and the frequency of the centrifugal vibrator (9) is set to 25Hz. They work together for 15 minutes to complete the cleaning of the inside and outside of the oil tank.

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