Tank cleaning device

Abstract

The utility model provides a tank cleaning device which comprises a swing rack, a rotating frame and a swing shaft, the two ends of the shaft are connected with basic adapter plates, and a holding piece is arranged between the shaft and the rack. The rotating frame is provided with a pressing assembly which is connected with the rack and the frame. Lower rods of the trapezoidal frame on the lower side of the rack are short to form inclined connection and triangular reinforcing ribs, and vertical rods are arranged in the middle to enhance bending resistance and stability. A frame above the machine frame is rectangular, *-shaped reinforcing ribs are arranged on the frames on the two sides, the center is a rotating axis, and the pressing assemblies are arranged in a surrounding mode. One end of the pressing assembly is an elastic pressing assembly which adapts to the shape of the tank and keeps stable. Reinforcing ribs and supporting brackets are arranged in the middle of the rack, so that the structural strength is improved. The rack is tightly matched with the shaft, and resonance cleaning is achieved. The pressing beam on the rotating frame fixes the tank to ensure stable fixation. And the tank, the rotating frame and the pressing assembly are coaxially designed, so that the rotating precision is improved. A driving mechanism is arranged outside the device and connected with the swing shaft and the frame, and the whole is installed on a swing platform.

Description

Technical Field

[0001] The utility model relates to the field of tank cleaning, and in particular to a tank cleaning device. Background Art

[0002] An ISO tank (tank container) is a stainless steel pressure vessel mounted within a rigid external frame. Tank container transport is recognized as a safe method for transporting chemicals and foods. Compared to other methods, it offers a superior transport method for distributing chemicals and foods to various locations, preventing leakage, leaks, and contamination of the cargo itself. Tanks require internal cleaning before commissioning, especially those transporting ultrapure chemicals (10 to the negative 12th power), which requires a higher standard of cleaning to prevent impurities from affecting the purity of the liquid, such as those caused by production or material contamination. The traditional cleaning method involves filling the tank with a predetermined amount of liquid, loading it onto a tank truck, and driving it along the road, where the liquid flow slowly cleans the tank. According to industry insiders, this process takes approximately one month. Summary of the Invention

[0003] This utility model proposes a solution for cleaning ultrapure chemical tanks during transport: a two-degree-of-freedom mechanical platform is designed, upon which the tank is placed. Through mechanical combined motion, resonance is utilized to achieve comprehensive cleaning of the tank's interior. Because such equipment is not currently available domestically or internationally, it is generally referred to as a "tank cleaning device" or "cleaning swing machine."

[0004] A tank cleaning device comprises a swing frame and a rotating frame, wherein the rotating frame is placed on a roller frame as a whole, and the roller frame and the rotating frame are installed inside the swing frame;

[0005] The swing frame is provided with a swing shaft, a clamping piece is provided at the connection between the swing shaft and the swing frame, and a swing shaft base adapter plate is provided at both ends;

[0006] A pressing assembly is provided at the end of the swing frame, and the pressing assembly is connected to the rotating frame.

[0007] Preferably, the swing frame is a rectangular frame with an inverted trapezoidal frame welded underneath. There are reinforcing ribs on both sides of the rectangular frame. The reinforcing ribs are in the shape of a cross. The center of the cross is the axis of rotation, and the clamping assembly is arranged around the axis.

[0008] Preferably, the lower rod of the inverted trapezoidal part of the swing frame is shorter than the upper rod, the two rods are connected obliquely, a plurality of triangular reinforcing ribs are provided between the two rods, and two vertical rods are provided in the middle.

[0009] Preferably, the pressing assembly at one end of the swing frame is an elastic pressing assembly, and the pressing assembly presses the contact piece to fix the rotating frame.

[0010] Preferably, the inverted trapezoidal frame of the swing rack is provided with a plurality of reinforcing ribs of the same shape, a clamping piece is provided between each reinforcing rib, and a supporting bracket is also provided.

[0011] Preferably, the upper and lower rods of the swing frame are in close contact with the middle swing shaft, and the two vertical rods in the middle of the swing frame are also in close contact with the swing shaft.

[0012] Preferably, a tank body pressing beam is provided above the rotating frame, and a threaded lock is provided at the bottom to connect with the four corner pieces of the tank.

[0013] Preferably, the centers of the tank, the rotating frame and the pressing assembly are coaxial.

[0014] Preferably, a driving mechanism is provided on the outside of the tank cleaning device and is connected to the swing shaft through a transmission structure using a variable frequency speed regulating motor, a worm gear reducer and a crank connecting rod.

[0015] The beneficial effects of the present invention are as follows: a set of two-degree-of-freedom mechanical equipment platforms is designed, on which the inner cavity of the tank can be cleaned in all directions under the combined mechanical motion. The design of the swing axis allows the swing frame to swing within a certain range, causing the liquid to resonate and enhance the cleaning effect. The elastic clamping assembly at one end can be adaptively adjusted according to the shape of the tank to ensure the stability of the tank during the cleaning process. The tank body clamping beam above the rotating frame can ensure that the tank is stably fixed during the cleaning process to prevent displacement or damage caused by the cleaning action. The movement of the entire device includes rotational motion and swinging motion. The swinging motion is to clean by allowing the liquid in the tank to reach resonance. The liquid moving in the tank has a certain resonant frequency. When the swinging frequency reaches the resonant frequency, only a very small swinging angle is needed to allow the liquid in the tank to have a greater flushing effect on the inner wall of the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present utility model.

[0017] Figure 2 It is a front view of the present utility model.

[0018] Figure 3 It is a side view of the present utility model.

[0019] In the figure: 1. Swing frame, 2. Swing shaft, 3. Clamping part, 4. Rotating frame, 5. Threaded lock, 6. Clamping assembly (elastic), 7. Clamping assembly, 8. Driving mechanism, 9. Contact part, 10. Tank clamping beam, 11. Swing base adapter plate, 12. Support bracket, 13. Roller frame. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] A tank cleaning device includes a swing frame 1 and a rotating frame 4, wherein the rotating frame 4 is placed as a whole on a roller frame 13, and the roller frame 13 and the rotating frame 4 are installed inside the swing frame 1;

[0022] The swing frame 1 is provided with a swing shaft 2, a clamping member 3 is provided at the connection between the swing shaft 2 and the swing frame 1, and a swing shaft base adapter plate 11 is provided at both ends;

[0023] A pressing assembly 7 is provided at the end of the swing frame 1 , and the pressing assembly 7 is connected to the rotating frame 4 .

[0024] The lower rod of the inverted trapezoidal portion of the swing frame 1 is shorter than the upper rod. The two rods are connected at an angle, with several triangular-shaped reinforcement ribs installed between the two rods, and two vertical rods are set in the middle. The two rods are connected at an angle and the reinforcement ribs improve the bending resistance of the frame, reducing the possibility of bending or deformation during the swinging process. The design of the lower rod being shorter than the upper rod provides better stability. Because this structure is similar to a trapezoid, it provides sufficient stability while also having a certain strength. The triangular reinforcement ribs significantly increase the strength and rigidity of the frame. The triangular structure can effectively disperse and withstand forces from different directions. By adjusting the length and tilt angle of the upper and lower rods, the spatial layout of the frame is optimized, making the space below more compact.

[0025] The upper frame of the swing frame 1 is in the shape of a rectangular frame, and the reinforcement ribs on both sides are in the shape of a cross. The center of the cross is the axis of rotation, and the clamping assembly 7 is arranged around the axis. The design of the upper frame of the swing frame 1 adopts a rectangular frame. This shape not only provides good structural stability, but also helps to evenly distribute the load due to its symmetrical and balanced characteristics. These characteristics of the rectangular frame ensure the stability of the frame during rotation and can reduce the distortion and bending caused by uneven load. Further enhancing the stability of the swing frame 1 is its cross-shaped reinforcement rib design. These reinforcement ribs not only increase the rigidity of the frame, so that the frame can better resist distortion and bending during rotation and maintain its shape and function, but also help to evenly distribute the pressure and load on the frame. This uniform distribution reduces local stress concentration, thereby significantly improving the durability and reliability of the frame and extending its service life.

[0026] The center of the Pozidrivium serves as the axis of rotation. This central position ensures balance and symmetry during rotation, reducing vibration and wear caused by imbalance. Balanced rotation not only improves the efficiency of the cleaning process, but also helps protect the frame and tank from damage caused by vibration.

[0027] Finally, the arrangement of the compression assembly 7 around the axis provides uniform pressure distribution for the swing frame 1. This design ensures that the rotating frame can maintain close contact with the tank during operation. The uniform pressure distribution means that the cleaning liquid can more effectively contact every part of the tank wall, thereby ensuring a thorough and consistent cleaning process.

[0028] In summary, the design of the swing rack 1 ensures the stability, durability and efficiency of the rack during the cleaning process through the rectangular frame shape, the structure of the cross-shaped reinforcement ribs, the balance of the central axis and the uniform layout of the clamping components.

[0029] The clamping assembly 7 at one end of the swing frame 1 is an elastic clamping assembly 6. The elastic clamping assembly 6 can automatically adjust the pressure according to the specific shape and size of the tank. This adaptive ability ensures that good contact with the tank is always maintained, thereby effectively improving the cleaning effect. Whether facing irregular outer shapes or tanks of different sizes, the elastic clamping assembly 6 can provide just the right amount of pressure to ensure an efficient and thorough cleaning process. In addition, the design of the elastic clamping assembly 6 also takes into account the convenience of operation. It is not only easy to install, but also very simple to adjust, allowing operators to quickly adjust the clamping assembly according to specific cleaning needs to adapt to different cleaning tasks. This flexibility greatly improves the practicality and applicability of the cleaning device.

[0030] To further enhance the stability of the swinging frame 1, a bull's-eye bearing and spring design are employed at its ends. This structure plays a crucial role during the cleaning process when the tank rotates or swings, effectively preventing the tank from moving and ensuring a smooth cleaning process. The high load capacity of the bull's-eye bearing and the elastic support of the spring combine to provide stable support for the tank, reducing the risk of reduced cleaning effectiveness or equipment damage due to tank movement.

[0031] In summary, the design of the swing frame 1 fully considers cleaning effectiveness, operational convenience, and stability. The automatic adjustment capability of the elastic clamping assembly 6, the simple installation and adjustment method, and the stability design of the end bull's eye bearing and spring ensure that the cleaning device can provide efficient and stable cleaning performance under various operating conditions.

[0032] The forward and backward swinging frame 1 is interlocked with several identically shaped reinforcing ribs, each supported by supporting brackets 12. These ribs not only form a sturdy network but also support the supporting brackets 12, further enhancing the overall structural stability. This design strategy significantly enhances the structural strength of the frame, enabling it to withstand greater loads and pressures. This reduces deformation or damage caused by excessive loads when operating under heavy loads or extreme conditions, thereby ensuring the long-term reliability and durability of the equipment.

[0033] In addition, the design of these reinforcing ribs and support brackets 12 also helps to evenly distribute the load on the frame. This uniform load distribution reduces local stress concentration. Local stress concentration is often the main cause of material fatigue and structural damage. Through this design, the frame can more effectively disperse and withstand these stresses, thereby extending its service life. At the same time, the setting of the reinforcing ribs and support brackets 12 also helps to improve the stability of the entire frame. The support bracket 12 extends to the outside of the frame through a long connecting rod crank. When the equipment is running for tank cleaning operations, the support is in a high position (raised state); when a tank is cleaned and the tank is replaced, the equipment is stopped in a horizontal position, and the support is lowered to the ground, supporting the ground firmly, providing safe and reliable support for lifting, disassembling fixed angle fittings, etc., and protecting the frame and transmission system from harmful loads such as collisions, impacts, vibrations, etc. generated by lifting operations. This improvement in stability not only ensures the safety of operators, but also ensures the efficiency and accuracy of the cleaning process.

[0034] In summary, the design of the reinforcing ribs and support brackets 12 in the forward and backward swinging frame 1 not only enhances the frame's structural strength and durability, but also improves its stability and safety, enabling the entire cleaning device to perform exceptionally well in the face of various challenges. This meticulous design reflects the engineers' unwavering pursuit of improving equipment performance and safety.

[0035] The upper and lower rods of the swing frame 1 are closely connected to the central swing shaft 2, and the two vertical rods in the middle of the swing frame 1 are also closely connected to the swing shaft 2. This design not only improves the rigidity of the entire swing frame 1 but also significantly reduces the potential for bending and twisting during the swinging process. This close fit ensures the stability and reliability of the frame when subjected to external forces, providing a solid foundation for the entire cleaning device.

[0036] Furthermore, this close proximity to the swing axis 2 enhances the structural strength of the frame. It allows the frame to withstand greater loads and pressure, effectively reducing the risk of deformation or damage due to excessive loads. This is crucial for improving the performance of the equipment under long-term and high-load conditions. Furthermore, the close proximity to the swing axis 2 helps reduce play during the swinging process. This precise fit ensures precise and consistent operation of the swing frame 1. Whether cleaning the interior of a tank or removing stubborn stains, the swing frame 1 provides stable and precise cleaning action.

[0037] Finally, the upper and lower bars and the middle vertical bars located close to the swing axis 2 help absorb and reduce vibration during the swinging process. This not only improves the stability of the equipment but also enhances operational safety. Through these meticulous designs, the swing frame 4 becomes the core component of an efficient, stable, and reliable cleaning device.

[0038] A tank body clamping beam 10 is provided above the rotating frame 4. The four corner pieces at the bottom of the tank, the movable crossbeam at the top (tank body clamping beam 10), and the tightening screws on the side enable the tank to be fixed in all directions during a 360-degree rotation. This fixing method ensures the stability of the tank during the cleaning process and prevents displacement or vibration caused by rotation. The use of threaded locks 5 and bolts makes the fixing and releasing of the tank simple and quick, reduces operation time, and improves work efficiency. This design is also highly adaptable and can accommodate tanks of different sizes and shapes, providing a flexible fixing solution and increasing the applicability of the equipment.

[0039] The all-around tank fixation reduces the risk of accidents caused by tank movement or vibration, improving operational safety. This fixation method also helps reduce equipment wear by minimizing unnecessary tank movement during the cleaning process, thereby reducing friction and collisions with the cleaning equipment and extending equipment life. Stable tank fixation also reduces downtime during the cleaning process, improving production line continuity and productivity. The threaded lock and bolt design also facilitates inspection and maintenance, helping to promptly identify and resolve potential issues and reduce downtime.

[0040] Furthermore, the design of the tank hold-down beam 10 makes the entire mounting structure compact and space-saving, making it suitable for work environments with limited space. Finally, the all-around mounting method enhances the stability of the entire rotating frame 4, maintaining stability even at high speeds or under heavy loads, reducing the risk of poor cleaning results or equipment damage due to equipment instability.

[0041] In summary, the tank body clamping beam 10 above the rotating frame 4 and the all-round fixing method of the tank not only improve the cleaning effect and operating efficiency, but also enhance the safety and stability of the equipment. It is an effective design to improve the performance of the tank cleaning equipment.

[0042] The tank, rotating frame 4, and clamping assembly 7 are coaxially aligned. This coaxial design helps reduce mechanical stress and eliminates the additional pressure and friction caused by misalignment. This reduced stress helps extend the life of the equipment and reduces maintenance costs. It also improves structural stability, centralizing the center of gravity of the entire system and reducing vibration and oscillation during operation.

[0043] Safety is also a key advantage of the coaxial design. Reduced extra stress and vibration help lower the risk of accidents and improve operational safety. Furthermore, the coaxial design helps optimize space utilization, allowing the equipment to achieve maximum functionality within a limited space. The coaxial design also improves the precision of rotation and swing, making tank cleaning more efficient. In summary, the central coaxial design of the tank, rotating frame 4, and clamping assembly 7 not only improves cleaning efficiency and uniformity, but also contributes to improved equipment stability, safety, and maintainability.

[0044] The tank cleaning device is equipped with a drive mechanism 8 on the outside, connected to the swing shaft 2 and rotating frame 4. This design allows the rotating frame and rotary drive mechanism to be mounted as a single unit on the swing platform, supported by bearing blocks, enabling the platform to swing about the axis. The swing drive mechanism utilizes a variable-frequency speed-regulating motor, a worm gear reducer, and a crankshaft transmission structure. This combination of technologies offers significant advantages for the cleaning device.

[0045] First of all, this design significantly improves cleaning efficiency and quality. The precise swing and rotation movements ensure that the cleaning liquid can fully contact the inner wall of the tank, thereby improving the cleaning effect. The swing platform supported by the bearing seat provides additional operational flexibility, allowing the device to easily adapt to tanks of different shapes and sizes, improving work efficiency. The use of the bearing seat provides stable support for the swing platform, reducing equipment damage caused by vibration or improper operation, and extending the service life of the equipment. The variable frequency speed regulation motor allows the operator to precisely adjust the swing speed according to cleaning needs, improving the controllability of the cleaning process. The use of a worm gear reducer provides a smooth and precise reduction transmission. The crank-connecting rod transmission structure effectively converts the rotational motion of the motor into reciprocating swing of the swing platform, ensuring the continuity and uniformity of the cleaning process.

[0046] The design, which is entirely mounted on a swing platform, simplifies maintenance and inspection of the drive and rotary drive mechanisms, facilitating timely identification and resolution of problems and minimizing downtime. Furthermore, this design improves production efficiency. By precisely controlling the swing and rotation motions, it helps shorten cleaning cycles and enhances production line continuity. Finally, this design demonstrates strong adaptability and safety. It can adapt to diverse cleaning environments and requirements, meeting both high-purity requirements and cleaning tasks requiring specialized swing angles. Furthermore, the stable swing platform and precise transmission structure reduce the risk of unexpected operations, improve operational safety, and ensure operator safety.

[0047] For cylindrical tanks, the natural period of the liquid in the tank can be calculated according to the general formula (1):

[0048]

[0049] Where, l is the length of the tank, in m; h is the liquid height, in m; D is the diameter of the tank, in m.

[0050] In the hydraulic calculation formula, the flow rate of the drainage pipe should be calculated according to the following formula (2):

[0051] Q=Av(2)

[0052] Where Q is the design flow rate, m 3 / s; A is the effective cross-sectional area of water flow, m 2 ; v is the flow velocity, m / s.

[0053] The flow rate of the drainage channel should be calculated according to the following formula (2):

[0054]

[0055] Where R is the hydraulic radius, m, l is the hydraulic gradient; X is the wetted perimeter, m.

[0056] Substituting (3) into (2), we get:

[0057]

[0058] Therefore, the flow rate of water in the sink can be calculated as follows:

[0059]

[0060]

[0061]

[0062]

[0063] 0.25D i For example, when the excitation frequency is 0.6f n (0.13Hz) to 1.4f n In the (0.31Hz) range, the liquid in the tank mainly shows the third waveform, but because the head is a curved surface, the free liquid surface will roll down along the head and then break. Specifically, when the excitation frequency is far away from f n (0.22Hz), the liquid will "accumulate" at both ends of the tank, with almost no impact force; as the excitation frequency increases, the free liquid surface rises along the head. n After (0.31Hz), the liquid begins to show the fourth waveform feature, that is, the formation of surging waves that move back and forth in the cabin, and break after the head rolls over, or form a water jump. n (0.35Hz), the liquid in the tank returns to the standing wave state, indicating that the first-order sloshing of the liquid level has reached saturation. When the liquid height remains unchanged, the excitation frequency is f n When the excitation amplitude is changed to 1° or 5° at 0.22Hz, the sloshing waveform in the tank does not change and remains the third waveform. This allows the calculation of the optimal sloshing angle required to achieve resonance.

[0064] For example, a 20-cubic-meter tank weighs 5 tons empty and is suitable for chemical industry applications requiring thorough interior cleaning. The device comprises a swing frame 1 and a rotating frame 4. The rotating frame 4 is mounted on a roller frame 13 and positioned within the swing frame 1 to provide stable support during the cleaning process.

[0065] The swing frame 1 features a swing shaft 2, with a clamping member 3 at the connection between the shaft and the frame to ensure stability during swinging. Swing shaft base adapter plates 11 are installed at each end, while clamping assemblies 7 are installed at the ends, connecting to the rotating frame 4 to secure the 20-cubic-meter tank during cleaning. The swing frame 1 adopts an inverted trapezoidal design, with the lower rod shorter than the upper rod. The two rods are tilted and connected by triangular reinforcement ribs. Two vertical rods are located in the middle, enhancing the frame's bending resistance and reducing the possibility of bending or deformation during swinging.

[0066] During the cleaning process, the tank is filled with 5 to 6 cubic meters of cleaning solution. The rotation speed is controlled at 1 revolution per minute (1 r / min), while the swing angle is ±5 degrees. This precise control allows the cleaning liquid to effectively resonate within the tank, improving the cleaning effect. The swing speed is 10 revolutions per minute (10 r / min), further enhancing the impact of the cleaning liquid on the tank wall.

[0067] The upper frame of the swing frame 1 is designed as a rectangle, with two side reinforcement ribs in the shape of a cross. They are arranged around the axis of rotation, and the clamping assembly 7 is arranged around the axis as the center of the circle to ensure balance and symmetry during rotation. This design not only improves cleaning efficiency but also helps protect the frame and tank from damage caused by vibration.

[0068] The elastic clamping assembly 6 automatically adjusts pressure based on the specific shape and size of the tank, ensuring consistent contact with the tank during cleaning and improving cleaning results. The reinforcing ribs and support brackets 12 in the middle of the swinging frame 1 further enhance the stability and durability of the overall structure.

[0069] A tank hold-down beam 10 above the tank holder ensures the stability of the 20-cubic-meter tank during cleaning, preventing displacement or vibration caused by rotation. The entire tank cleaning system is designed with coaxiality in mind, enhancing the precision of rotation and ensuring efficient and consistent cleaning.

[0070] The scope of protection of this utility model is not limited to the specific embodiments described herein but is determined by the accompanying claims and equivalents recognized under patent law. This means that all technical solutions that are identical or equivalent to the present utility model in principle and spirit are within the scope of protection of this utility model. Therefore, the innovation and practicality of this utility model are not limited to the present embodiment but also include all possible and reasonable derivatives and extensions.

Claims

1. A tank cleaning device comprising a swing frame (1) and a rotating frame (4), characterized in that: The rotating frame (4) is placed as a whole on the roller frame (13), and the roller frame (13) and the rotating frame (4) are installed inside the swing frame (1); The swing frame (1) is provided with a swing shaft (2), a clamping member (3) is provided at the connection between the swing shaft (2) and the swing frame (1), and swing shaft base adapter plates (11) are provided at both ends; A pressing assembly (7) is provided at the end of the swing frame (1), and the pressing assembly (7) is connected to the rotating frame (4).

2. A tank cleaning device according to claim 1, characterized in that: The swing frame (1) is a rectangular frame with an inverted trapezoidal frame welded below. Reinforcement ribs are provided on both sides of the rectangular frame. The reinforcement ribs are in a M-shape, and the center of the M-shape is the axis of rotation. The pressing assembly (7) is arranged around the axis as the center of a circle.

3. A tank cleaning device according to claim 2, characterized in that: The lower rod of the inverted trapezoidal part of the swing frame (1) is shorter than the upper rod, the two rods are connected obliquely, a plurality of triangular reinforcing ribs are arranged between the two rods, and two vertical rods are arranged in the middle.

4. The tank cleaning device according to claim 1, characterized in that: The pressing assembly at one end of the swing frame (1) is an elastic pressing assembly (6), which presses the contact piece (9) to fix the rotating frame (4).

5. The tank cleaning device according to claim 1, characterized in that: The inverted trapezoidal frame of the swing frame (1) is provided with a plurality of reinforcing ribs of the same shape, a clamping piece (3) is provided between each reinforcing rib, and a supporting bracket (12) is also provided.

6. A tank cleaning device according to claim 1, 2, 4 or 5, characterized in that: The upper and lower rods of the swing frame (1) are in close contact with the middle swing shaft (2), and the two vertical rods in the middle of the swing frame (1) are also in close contact with the swing shaft (2).

7. The tank cleaning device according to claim 1, characterized in that: A tank body pressing beam (10) is provided above the rotating frame (4), and a threaded rotary lock (5) is provided at the bottom thereof for connection with four corner pieces of the tank.

8. The tank cleaning device according to claim 1, characterized in that: The centers of the tank, the rotating frame (4) and the pressing assembly (7) are coaxial.

9. The tank cleaning device according to claim 1, characterized in that: A driving mechanism (8) is provided on the outside of the tank cleaning device and is connected to a transmission structure using a variable frequency speed regulating motor, a worm gear reducer and a crank connecting rod and an oscillating shaft (2).

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