Hydraulic oil tank and cleaning method facilitating internal cavity cleaning

Abstract

This invention proposes a hydraulic oil tank that facilitates internal cleaning, comprising an oil tank body, a cleaning rotor, and a drive assembly. The internal cavity of the oil tank body includes a return oil chamber, a suction oil chamber, and an overflow chamber located between the return oil chamber and the suction oil chamber. The return oil chamber and the suction oil chamber are respectively connected by a return oil pipe and a suction oil pipe. The cleaning rotor is located at the bottom of the return oil chamber and includes a first cleaning section and a second cleaning section. The bottom and side surfaces of the first cleaning section are provided with cleaning structures to complete the cleaning process of the bottom and side edges of the return oil chamber. The second cleaning section is provided with several cleaning scrapers along the circumference to clean the side walls of the return oil chamber. The drive assembly is located at the bottom or top of the oil tank body and includes a coupling assembly magnetically coupled to the cleaning rotor. The drive mechanism drives the coupling assembly to rotate and changes the planar position of the coupling assembly, thereby driving the cleaning rotor to rotate and move synchronously within the return oil chamber, achieving full-coverage cleaning of the bottom of the return oil chamber.

Description

Technical Field

[0001] This invention relates to the field of hydraulic tank technology, and in particular to a hydraulic tank and cleaning method that facilitates cleaning of the inner cavity. Background Technology

[0002] The hydraulic oil tank is a core component in a hydraulic system used for storing hydraulic fluid, dissipating heat, and settling impurities. During the operation of the hydraulic system, impurities such as metal particles, colloids, and dust carried by the return oil line enter the oil tank. Some large particles, such as metal particles and sludge, settle to the bottom of the tank due to gravity, forming bottom sediment. Some lighter particles, colloids, and aging products remain suspended in the oil and are difficult to settle naturally, forming suspended dirt. After prolonged use, the bottom and inner walls of the return oil chamber will be filled with impurities. Under long-term use, this not only affects the cleanliness of the oil but also reduces the oil storage capacity of the tank to some extent.

[0003] Existing self-cleaning oil tank solutions mostly focus on cleaning impurities adhering to the inner wall of the return oil chamber. For example, invention patent application number 202510553068.0 discloses a high-cleaning-performance hydraulic oil tank, which consists of a tank body, an oil pan, and an oil tank cover. The tank body has return oil pipes and suction oil pipes at both ends, and internally contains a return oil chamber, an overflow chamber, and a suction oil chamber. The oil pan is located at the bottom of the tank body, and the oil tank cover is fixed to the top. Multiple quick-release components are provided on the outside of the tank body. The oil tank cover has two cleaning components corresponding to the return oil chamber and the suction oil chamber, and an overflow component corresponding to the overflow chamber. The cleaning components can clean impurities on the inner wall of the oil tank and eliminate air bubbles and foam on the oil surface, improving cleaning efficiency; simultaneously, the overflow component heats the oil, ensuring operation in cold environments.

[0004] However, such solutions still have shortcomings. The cleaning components they use mainly focus on cleaning the inner wall of the oil tank. Most of the accumulated sediment and impurities are concentrated in the bottom edge corner of the oil return chamber. Conventional cleaning components have difficulty reaching this area. At the same time, they lack the ability to handle suspended dirt. Some solutions require traversing the entire bottom of the oil tank, and the drive mechanism is complex and energy consumption is high. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a hydraulic oil tank that is easy to clean, focusing on cleaning the edge corners at the bottom of the return oil chamber, while also taking into account the removal of suspended dirt in the oil.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a hydraulic oil tank that facilitates internal cleaning, comprising: The oil tank body has an inner cavity including an oil return chamber, an oil suction chamber, and an overflow chamber located between the oil return chamber and the oil suction chamber. The oil return chamber and the oil suction chamber are respectively connected to an oil return pipe and an oil suction pipe. The cleaning rotor, located at the bottom of the oil return chamber, includes a first cleaning section and a second cleaning section; The bottom and sides of the first cleaning section are provided with cleaning structures, configured to clean the bottom and side areas of the oil return chamber; The second cleaning section is provided with several cleaning blades along the circumference, configured to clean the sidewalls of the oil return chamber and collect suspended impurities in the oil return chamber; The drive assembly, located at the bottom or top of the fuel tank body, includes: A coupling assembly is magnetically coupled to the clean rotor; A drive mechanism, connected to the coupling component, is configured to drive the coupling component to rotate and change the planar position of the coupling component.

[0007] Furthermore, the cleaning structure includes a cleaning brush and cleaning bumps; the cleaning brush is evenly distributed circumferentially along the first cleaning section; the cleaning bumps are evenly distributed on the bottom surface of the first cleaning section.

[0008] Furthermore, the surface of the cleaning scraper is provided with a plurality of adsorption protrusions spaced apart along its length and circumferential direction.

[0009] Furthermore, the cleaning scraper is made of any one of oil-resistant nylon, polyester fiber, and hydrogenated nitrile rubber; the adsorption bump is made of any one of nitrile rubber, hydrogenated nitrile rubber, and fluororubber.

[0010] Furthermore, the cleaning rotor is provided with a first magnet, which includes a plurality of magnetic cores disposed in the cleaning rotor.

[0011] Furthermore, the coupling component includes a limiting sleeve and a second magnet located within the limiting sleeve, the height of the second magnet being greater than the depth of the limiting sleeve and capable of magnetic coupling with the first magnet.

[0012] Furthermore, it also includes a magnetic drive assembly, which includes a connecting drive rod and a third magnet. One end of the connecting drive rod is fixedly connected to the top of the second cleaning section, and the third magnet is coaxially fixed to the other end of the connecting drive rod. The third magnet can be magnetically coupled to the second magnet.

[0013] Furthermore, the driving component includes: A rotary drive mechanism, fixedly connected to the coupling component, is configured to drive the second magnet to rotate; The translation drive mechanism is equipped with a rotary drive mechanism, which is configured to drive the second magnetic block to reciprocate along the bottom edge trajectory of the oil return chamber to complete the cleaning process of the bottom edge of the oil return chamber.

[0014] Furthermore, the translation drive mechanism includes a first displacement drive mechanism and a second displacement drive mechanism that are perpendicular to each other. Either the first displacement mechanism and the second displacement drive mechanism are parallel to one side edge of the hydraulic oil tank, and the stroke of either the first displacement mechanism and the second displacement drive mechanism is not less than the length of the return oil chamber, while the stroke of the other is not less than the width of the return oil chamber.

[0015] Furthermore, a cleaning method for a hydraulic oil tank that facilitates internal cleaning includes the following steps: 1) Sedimentation cleaning: The cleaning rotor is driven by the drive assembly to move along the edge of the oil return chamber while rotating at a low speed in a clockwise or counterclockwise direction to scrape off the sludge attached to the bottom and sides and push it into the sludge collection tank located at the bottom of the oil return chamber. 2) Suspension collection: While driving the cleaning rotor to move along the edge of the oil return chamber, the state switching of the cleaning rotor is completed in the sequence of clockwise rotation, counterclockwise rotation and stop rotation, adsorbing suspended dirt in the oil along the way; 3) Defoaming treatment: Drive the cleaning rotor to the middle area of ​​the oil return chamber and simultaneously complete the high-speed rotation of clockwise and counterclockwise rotation in sequence to shear and break up the fine bubbles and promote the merging and floating of the bubbles.

[0016] Compared with the prior art, the beneficial effects of the present invention include: In the technical solution of this application embodiment, the hydraulic oil tank that facilitates internal cleaning includes an oil tank body, a cleaning rotor, and a drive assembly. The internal cavity of the oil tank body includes a return oil cavity, a suction oil cavity, and an overflow cavity located between the return oil cavity and the suction oil cavity. The return oil cavity and the suction oil cavity are respectively connected to a return oil pipe and a suction oil pipe. The cleaning rotor is located at the bottom of the return oil cavity and includes a first cleaning section and a second cleaning section. The bottom and side surfaces of the first cleaning section are provided with cleaning structures to complete the cleaning process of the bottom and side edges of the return oil cavity. The second cleaning section is provided with several cleaning scrapers along the circumferential direction to clean the side walls of the return oil cavity. The drive assembly is located at the bottom or top of the oil tank body and includes a coupling assembly magnetically coupled to the cleaning rotor. The drive mechanism drives the coupling assembly to rotate and changes the planar position of the coupling assembly, thereby driving the cleaning rotor to rotate and move synchronously in the return oil cavity, achieving full-area cleaning of the bottom of the return oil cavity. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The overall structure of the hydraulic oil tank, which facilitates internal cleaning as a first embodiment, is shown; Figure 2Showing Figure 1 The front view of the hydraulic oil tank shown is designed to facilitate cleaning of its internal cavity. Figure 3 Showing Figure 1 The internal structure of the hydraulic oil tank shown is designed to facilitate cleaning of the inner cavity. Figure 4 The overall structure of the first embodiment of the cleaning rotor is shown; Figure 5 Showing Figure 4 The bottom structure of the cleaning rotor shown in the figure; Figure 6 Showing Figure 4 The top view of the cleaning rotor shown; Figure 7 Showing Figure 6 A magnified view of the local structure in region C; Figure 8 Showing Figure 4 A magnified view of the local structure in region A; Figure 9 The overall structure of the second embodiment of the cleaning rotor is shown; Figure 10 Showing Figure 9 The magnified structure of region B in the middle; Figure 11 The vertical cross-sectional view of the cleaning rotor is shown; Figure 12 The transverse cross-sectional structure of the first cleaning section is shown; Figure 13 The overall structure of the driving component is shown; Figure 14 The overall structure of a hydraulic oil tank that facilitates internal cleaning, as a second embodiment, is shown; Figure 15 Showing Figure 14 The internal structure of the hydraulic oil tank shown is designed to facilitate cleaning of the inner cavity. Figure 16 Showing Figure 14 The connection between the cleaning rotor and the magnetic drive assembly.

[0018] Diagram labels: 1-Oil tank body, 11-Oil return chamber, 12-Overflow chamber, 13-Oil suction chamber, 2-Cleaning rotor, 21-First cleaning section, 211-Cleaning protrusion, 212-Cleaning brush, 22-Second cleaning section, 221-Cleaning scraper, 2211 First surface, 2212-Second surface, 2213-Fixed end, 2214-Inclined part, 2215-Free end, 2216-Suspended impurity collection area, 222-Adsorption protrusion, 223-Cleaning lint 23-First magnet, 231-Magnetic core, 3-Coupling assembly, 31-Limiting sleeve, 32-Second magnet, 4-Drive assembly, 41-Rotation drive mechanism, 42-Translation drive mechanism, 421-First displacement drive mechanism, 422-Second displacement drive mechanism, 5-Magnetic drive assembly, 51-Connecting drive rod, 52-Third magnet, 6-Return oil pipe, 7-Suction oil pipe, 8-Divider plate, 9-Filter screen, 10-Tank cover, 101-Removable cover plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0021] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0025] In this application, "multiple" means two or more (including two).

[0026] Please see Figure 1 and Figure 2A hydraulic oil tank that facilitates internal cleaning includes an oil tank body 1. The internal cavity of the oil tank body 1 includes a return oil chamber 11, an oil suction chamber 13, and an overflow chamber 12. The overflow chamber 12 is located between the return oil chamber 11 and the oil suction chamber 13. The return oil chamber 11 and the overflow chamber 12, and the overflow chamber 12 and the oil suction chamber 13 are separated by a partition. An overflow hole penetrating the thickness of the aforementioned partition is provided. By setting up a baffle and an overflow chamber 12, the returned oil enters the return oil chamber 11 through the return oil pipe 6, which is connected to the return oil chamber 11. The inlet of the return oil pipe 6 is close to the bottom of the return oil chamber 11, so the oil entering the return oil chamber 11 is unlikely to form large liquid surface fluctuations after passing the inlet of the return oil pipe 6. The settleable impurities in the oil can gradually fall to the bottom of the return oil chamber 11, while the relatively clean oil at the top of the return oil chamber 11 overflows sequentially into the overflow chamber 12 and the return oil chamber 11 through the overflow hole in the overflow plate, ensuring the cleanliness of the oil in the return oil chamber 11. Then, the oil is output through the suction pipe 7, which is connected to the suction chamber 13. It is worth noting that the outlet of the suction pipe 7 is also close to the bottom of the suction chamber 13 to ensure the stability of the liquid surface during the oil suction process and to avoid sucking in any trace impurities that may exist in the upper layer into the system. Meanwhile, the height of the overflow hole is precisely calculated to ensure that the oil in the return oil chamber 11 has sufficient time to settle. Only when the oil level is higher than the lower edge of the overflow hole will the clean upper layer of oil overflow into the overflow chamber 12, forming a natural graded filtration effect.

[0027] In some embodiments, the bottom of the oil return chamber 11 can be designed as a slightly inclined structure with a lower center and higher edges, with the inclination angle controlled between 2° and 5°. This design allows precipitated impurities to naturally accumulate towards the central area of ​​the bottom of the oil return chamber 11 under the action of gravity, facilitating centralized cleaning by the subsequent cleaning rotor 2. The edge area of ​​the bottom of the oil return chamber 11 forms a ring-shaped cleaning dead angle, which is difficult to reach with traditional fixed cleaning devices. However, the cleaning rotor 2 in this application can reciprocate along the bottom edge trajectory of the oil return chamber 11 by adjusting the planar position of the drive component 4, effectively solving the problem of scale accumulation in this area.

[0028] Please see Figure 3 The cleaning rotor 2 is located at the bottom of the return oil chamber 11. Please refer to [link / reference]. Figure 4 It adopts a segmented structural design, with the first cleaning segment 21 located at the bottom. Please refer to [link / reference]. Figure 5The bottom surface of the first cleaning section 21 is evenly covered with hard cleaning protrusions 211. These protrusions are made of wear-resistant polyurethane elastomer material and have a rounded or rectangular surface. When in contact with the bottom of the oil return chamber 11, they generate sufficient scraping force to remove adhering sludge and metal particles without damaging the inner surface of the oil tank. Cleaning brushes 212 are evenly distributed circumferentially along the sides of the first cleaning section 21. These brushes are made of oil-resistant nylon filaments with a diameter of 0.3mm to 0.5mm and a length of 15mm to 25mm, allowing them to penetrate deep into the right-angled area where the bottom of the oil return chamber 11 meets the side wall, removing accumulated impurities. The roots of the cleaning brushes 212 are embedded in the side grooves of the first cleaning section 21 and fixed with oil-resistant adhesive to ensure they do not fall off during high-speed rotation and reciprocating movement.

[0029] Please see Figure 4 The second cleaning section 22 is located above the first cleaning section 21, and the two are coaxially fixed together by a connecting column. The diameter of the connecting column is smaller than the diameter of the first cleaning section 21 to reduce the obstruction to the flow of oil.

[0030] As one of the implementation methods, such as Figure 4 and Figure 6 As shown, the second cleaning section 22 is provided with flexible cleaning blades 221 arranged circumferentially. The unfolded length of the cleaning blades 221 is 50mm to 70mm. They are made of any one of hollow oil-resistant nylon, polyester fiber, and hydrogenated nitrile rubber, preferably polyester fiber. The fiber surface has a microporous structure and a large specific surface area, which provides excellent adsorption performance for suspended colloidal matter and small particles in the oil. Several adsorption protrusions 222 are arranged on both sides of the cleaning blades 221. The adsorption protrusions 222 are made of any one of nitrile rubber, hydrogenated nitrile rubber, and fluororubber, preferably hydrogenated nitrile rubber, with a Shore A60 to A80 hardness. They are bonded to the cleaning blades 221 by a hot-melt process. The adsorption bumps 222 are hemispherical or ellipsoidal in shape, with a diameter of 2 mm to 4 mm. The spacing between adjacent adsorption bumps 222 is 5 mm to 8 mm. This distribution method ensures the adsorption area while avoiding mutual interference between the adsorption bumps 222, allowing the oil to pass smoothly through the cleaning scraper layer 221.

[0031] The following combination Figures 6 to 8 The working state of the cleaning rotor 2 will be described in detail.

[0032] First working state When the cleaning rotor 2 rotates, for example, in the opposite direction to the tilt direction of the cleaning scraper 221 (e.g.) Figure 6The cleaning rotor 2 rotates in a counterclockwise direction as shown. When the cleaning rotor 2 rotates, it drives the cleaning scraper 221 to rotate synchronously and contact the side wall of the oil return chamber 11, thus completing the scraping process on the side wall of the oil return chamber 11. This scrapes off the sludge adhering to the side wall of the oil return chamber 11 to form suspended impurities. The first surface 2211 of the cleaning scraper 221 directly contacts and adsorbs the suspended impurities in the oil.

[0033] like Figure 7 As shown, the aforementioned cleaning blade 221 includes a fixed end 2213, an inclined portion 2214, and a free end 2215 that is fixedly connected to the second cleaning section 22. The free end 2215 extends radially outward along the second cleaning section 22 and then folds back inward to form an integrally curved cleaning blade 221. The free end 2215 of any cleaning blade 221 engages with the inclined portion 2214 of the next cleaning blade adjacent to the inclined portion 2214 in the inclined direction. The fixed end 2213, the inclined portion 2214, and the free end 2215 of a cleaning blade 221, together with the fixed end 2213 and the inclined portion 2214 of the next adjacent cleaning blade, form a suspended impurity absorption area 2216. This suspended impurity absorption area is evenly distributed around the second cleaning section 22.

[0034] Second working state Please see Figures 6 to 8 When the cleaning rotor 2 is inclined along the cleaning scraper 221 (e.g.) Figure 6When the cleaning scraper 221 rotates clockwise (as shown), the second surface 2212 of the cleaning scraper 221 directly contacts the suspended impurities in the oil. Due to water resistance and collision with the sidewall of the return oil chamber 11, the free end 2215 of the cleaning scraper 221 separates from the inclined portion 2214, causing the aforementioned suspended impurity absorption area 2216 to open. Once the suspended impurity absorption area 2216 is open, suspended impurities that were washed into the oil by the first surface 2211 during the first working state but were not captured can be absorbed into the suspended impurity absorption area along with the oil flow. As the rotational speed of the cleaning rotor 2 increases, the inclination direction of the cleaning scraper 221 changes, allowing the second surface 2212 of the cleaning scraper 221 to perform a new washing process on the sidewall of the return oil chamber 11. During the cyclic switching between the first and second working states, the cleaning rotor 2, while rotating, uses cleaning scrapers 221 on its second cleaning section 22 to disturb the oil in the return oil chamber 11. The shearing force generated by the rotation breaks down and merges tiny air bubbles in the oil, forming larger bubbles. These larger bubbles rise rapidly to the oil surface due to buoyancy and burst, effectively reducing the gas content in the oil and minimizing cavitation damage to hydraulic components. Simultaneously, the disturbance effect of the cleaning scrapers 221 disrupts temperature stratification in the oil, promoting uniform heat distribution and preventing localized overheating that could lead to oil oxidation and deterioration. This synergistic aerodynamic-thermodynamic effect allows the cleaning rotor 2 to perform both impurity cleaning and oil degassing and temperature equalization, further enhancing the operational reliability of the hydraulic system.

[0035] Third working state When the cleaning rotor 2 stops rotating, the free end 2215 retracts inward and re-contacts with one side of the adjacent cleaning scraper 221 to form a sealed suspended impurity absorption area 2216. This sealed impurity storage area can effectively trap suspended particles in the oil, preventing the captured impurities from re-scattering into the oil during rotation. At the same time, the contact between adjacent cleaning scrapers 221 forms a dynamic sealing structure, which significantly reduces the oil flow velocity in this area, creating favorable conditions for the sedimentation and aggregation of impurities.

[0036] The above three working states can be arranged and combined arbitrarily, but it is preferable to cycle in the order of the first working state, the second working state, and the third working state. If the focus is on exhaust work, it is preferable to cycle in the order of the first working state and the second working state, and during exhaust work, cleaning rotor 2 does not require contact with the inner wall.

[0037] As one of the implementation methods, please refer to Figure 9The second cleaning section 22 is densely covered with cleaning fibers 223 along its circumference. The length of the cleaning fibers 223 is 30 mm to 50 mm, and the radial density is 80 to 120 fibers per square centimeter, forming a fluffy adsorption layer. The cleaning fibers 223 are made of any one of hollow oil-resistant nylon, polyester fiber, and hydrogenated nitrile rubber, preferably polyester fiber. The fiber surface has a microporous structure and a large specific surface area, which gives it excellent adsorption performance for suspended colloidal substances and small particles in the oil.

[0038] Please see Figure 10 To further enhance the adsorption effect, adsorption protrusions 222 are spaced along the length and circumference of the surface of the cleaning fibers 223. The adsorption protrusions 222 are made of any one of nitrile rubber, hydrogenated nitrile rubber, and fluororubber, preferably hydrogenated nitrile rubber, with a Shore A60 to A80 hardness. They are bonded to the cleaning fibers 223 by a hot-melt process. The adsorption protrusions 222 are hemispherical or ellipsoidal, with a diameter of 2 mm to 4 mm, and the spacing between adjacent adsorption protrusions 222 is 5 mm to 8 mm. This distribution method ensures the adsorption area while avoiding mutual interference between the adsorption protrusions 222, allowing the oil to pass smoothly through the cleaning fibers 223 layer.

[0039] In a further embodiment, multiple rings of cleaning fibers 223 are arranged along the height direction of the second cleaning section 22. These rings of cleaning fibers 223 can be uniformly arranged vertically, or adjacent rings can be staggered, meaning the radial projection of one ring of cleaning fibers 223 is exactly located in the middle region of the next ring of adjacent cleaning fibers 223. This staggered arrangement ensures that the oil, flowing through the second cleaning section 22, can fully contact the cleaning fibers 223 regardless of its radial path, eliminating the straight-through channels that might be formed by traditional aligned arrangements and significantly improving retention efficiency. The axial spacing of each ring of cleaning fibers 223 is 8mm to 12mm. This spacing is optimized to ensure that each ring of cleaning fibers 223 can independently perform its adsorption function while forming a continuous gradient filtration barrier.

[0040] The radial length of each ring of cleaning fibers 223 can vary gradually along the height direction. Specifically, the cleaning fibers 223 located at the lower part of the second cleaning section 22 are longer, ranging from 45mm to 50mm, with a radial density of 100 to 120 fibers per square centimeter; the cleaning fibers 223 gradually transitioning upwards to the middle section are 35mm to 45mm long, with a radial density of 90 to 100 fibers per square centimeter; and the cleaning fibers 223 located at the upper part are shorter, ranging from 30mm to 35mm, with a radial density of 80 to 90 fibers per square centimeter. This gradient structure design is based on the distribution pattern of impurities in the oil body—the lower part of the oil body has a higher impurity concentration and larger particle size, requiring stronger adsorption and retention capacity; as the oil body flows upwards, the impurity content gradually decreases, and the shorter cleaning fibers 223 can meet the filtration requirements, while reducing the oil flow resistance and ensuring smooth oil return.

[0041] The adsorption protrusions 222 on each ring of cleaning fibers 223 can also be staggered in the height direction, that is, the adsorption protrusions 222 of adjacent rings of cleaning fibers 223 are staggered by 30 to 60 degrees in the circumferential direction. This staggered arrangement causes the flow path of the oil to change continuously as it passes through the cleaning fibers 223 layers of different heights, increasing the probability of collision between the oil and the adsorption protrusions 222, thereby improving the capture efficiency of suspended colloidal matter. At the same time, the staggered arrangement avoids the adsorption protrusions 222 from forming a continuous obstruction surface in the axial direction, effectively reducing the resistance loss of oil flow, so that the pressure drop of the second cleaning section 22 is controlled within the range of 0.05MPa to 0.08MPa while maintaining high filtration accuracy.

[0042] Please see Figure 11 The roots of the cleaning fibers 223 are fixedly connected to the inner wall of the second cleaning section 22 by a hot melt adhesive layer. The thickness of the hot melt adhesive layer is 0.5mm to 1mm, and it uses oil-resistant polyurethane hot melt adhesive, which can maintain stable bonding strength even under long-term immersion in hydraulic oil. The cleaning fibers 223 extend radially outward from the roots at an angle of 15 degrees to 30 degrees, forming a barbed structure.

[0043] When the cleaning rotor 2 rotates, for example, if the cleaning rotor 2 rotates in the opposite direction to the tilt direction of the cleaning fibers 223, the first surface 2211 of the cleaning fibers 223 directly contacts the suspended impurities in the oil. The first surface 2211, as the oil-facing surface, bears the main impact load, and the adsorption protrusions 222 distributed on its surface first capture the suspended colloidal matter and metal shavings in the oil. At the same time, due to the barb structure formed by the tilt angle, once the impurities enter the gap between the fibers, they are difficult to escape in reverse, which enhances the reliability of the interception. If the cleaning rotor 2 rotates along the inclined direction of the cleaning fibers 223, the second surface 2212 of the cleaning fibers 223 directly contacts the suspended impurities in the oil. However, due to the inclined structure of the cleaning fibers 223, they do not unfold during the rotation of the cleaning rotor 2. Instead, they retract inward under the action of centrifugal force, forming a denser filter layer. At this time, the second surface 2212, as the back oil surface, mainly plays a secondary interception role, supplementing the capture of tiny particles that penetrate the first surface 2211. This bidirectional reversible rotation design of the cleaning rotor 2 allows the operator to flexibly choose the rotation direction according to the degree of contamination of the oil in the return oil chamber 11: when the impurity concentration is high and mainly consists of coarse particles, the reverse rotation mode is adopted, using the unfolded cleaning fibers 223 and the adsorption protrusions 222 on the oil-facing surface for efficient coarse filtration; when the impurity concentration is low and mainly consists of fine colloids, the forward rotation mode is adopted, using the dense layer formed by the retraction for fine filtration, realizing a multi-purpose adaptive cleaning strategy.

[0044] In other embodiments, during the rotation of the cleaning rotor 2, the cleaning fibers 223 on its second cleaning section 22 can disturb the oil in the return oil chamber 11. The shearing force generated by the rotation breaks up and merges the fine air bubbles in the oil, forming larger bubbles. These larger bubbles rise rapidly to the oil surface due to buoyancy and burst, effectively reducing the gas content in the oil and minimizing the damage to hydraulic components caused by cavitation. Simultaneously, the disturbance effect of the cleaning fibers 223 can also disrupt temperature stratification in the oil, promoting uniform heat distribution and preventing oil oxidation and deterioration caused by localized overheating. This synergistic aerodynamic-thermodynamic effect allows the cleaning rotor 2 to perform both impurity cleaning and oil degassing and temperature equalization, further improving the operational reliability of the hydraulic system.

[0045] The following is a detailed description of the drive assembly 4 of the cleaning rotor 2.

[0046] Please see Figure 11 and Figure 12 The cleaning rotor 2 has a first magnet 23 embedded inside. The first magnet 23 consists of four to six cylindrical magnetic cores 231. The magnetic cores 231 are made of neodymium iron boron permanent magnet material, and their surfaces are treated with a three-layer electroplating process of nickel, copper, and nickel to improve corrosion resistance. The magnetic cores 231 are evenly distributed along the circumference of the cleaning rotor 2, and their magnetic poles are aligned in the same direction and arranged along the axial direction of the cleaning rotor 2 to ensure a stable magnetic coupling relationship with the external coupling component 3. The magnetic cores 231 are covered with a non-magnetic stainless steel sheath. The sheath and the base of the cleaning rotor 2 are integrally formed by injection molding or die casting, which protects the magnetic cores 231 from oil corrosion and facilitates the overall processing and assembly of the cleaning rotor 2.

[0047] Please see Figure 1In the first embodiment, the drive assembly 4 is disposed on the outer bottom of the fuel tank body 1, and is suitable for fuel tank bodies 1 made of non-metallic materials. It includes a coupling assembly 3 and a drive mechanism. The coupling assembly 3 includes a limiting sleeve 31 and a second magnet 32. The limiting sleeve 31 is made of aluminum alloy or engineering plastic, possessing sufficient structural strength and light weight. The inner cavity of the limiting sleeve 31 is cylindrical, with a depth slightly less than the height of the second magnet 32, allowing the top of the second magnet 32 ​​to extend beyond the upper surface of the limiting sleeve 31, maintaining a gap of 2mm to 5mm with the outer side of the fuel tank bottom plate. Simultaneously, a thrust bearing is provided between the bottom of the second magnet 32 ​​and the bottom surface of the inner cavity of the limiting sleeve 31 to reduce rotational friction. The second magnet 32 ​​also uses neodymium iron boron permanent magnet material, and its magnetic pole arrangement corresponds to that of the first magnet 23. When the coupling component 3 is located below the bottom plate of the oil tank, the second magnet 32 ​​and the first magnet 23 are magnetically coupled through the non-magnetic material (such as aluminum alloy or stainless steel) of the bottom plate of the oil tank. The coupling force is sufficient to overcome the movement resistance of the cleaning rotor 2 in the oil and realize synchronous rotation and movement.

[0048] Please see Figure 13 The drive mechanism includes a rotary drive mechanism 41 and a translational drive mechanism 42. The rotary drive mechanism 41 is a servo motor or a stepper motor, and its output shaft is connected to the bottom center of the limit sleeve 31 via a coupling. The output speed can be steplessly adjusted within the range of 30 rpm to 180 rpm to adapt to the cleaning needs of oils with different viscosities and impurity contents. The translational drive mechanism 42 includes a first displacement drive mechanism 421 and a second displacement drive mechanism 422 that are perpendicular to each other. Both adopt ball screw modules or synchronous belt modules, and the positioning accuracy can reach ±0.1 mm. The first displacement drive mechanism 421 is arranged along the length direction of the oil return chamber 11, and its stroke is not less than the length of the oil return chamber 11. The second displacement drive mechanism 422 is arranged along the width direction of the oil return chamber 11, and its stroke is not less than the width of the oil return chamber 11. The two are superimposed to form a complete motion coverage in the XY plane. The rotary drive mechanism 41 is fixedly mounted on the slide of the second displacement drive mechanism 422, and the second displacement drive mechanism 422 is fixedly mounted on the slide of the first displacement drive mechanism 421, or they can be stacked in reverse according to the specific layout, as long as the orthogonality of the motion plane and the stroke coverage are guaranteed.

[0049] Please see Figure 14 In the second embodiment, the drive assembly 4 is disposed on the outer top of the fuel tank body 1, and is suitable for fuel tank bodies 1 made of metal. Please refer to [link to relevant documentation]. Figure 15 A magnetic drive component 5 is added to the original coupling component 3 and drive mechanism. Please refer to [link / reference]. Figure 16The magnetic drive assembly 5 includes a connecting drive rod 51 and a third magnet 52. The connecting drive rod 51 is a hollow cylindrical structure made of stainless steel or titanium alloy, ensuring both strength and weight reduction. The lower end of the connecting drive rod 51 is fixedly connected to the top center of the second cleaning section 22. The connection method can be a threaded connection or a pin connection, facilitating disassembly and maintenance. The third magnet 52 is coaxially fixed to the upper end of the connecting drive rod 51. The diameter and thickness of the third magnet 52 are designed according to the coupling requirements, and its magnetic pole direction corresponds to that of the second magnet 32. This allows the third magnet 52 to form magnetic coupling with the second magnet 32 ​​when the coupling assembly 3 is located above the oil tank cover 10. At this time, the cleaning rotor 2 is still in contact with the bottom of the oil return chamber 11, completing the cleaning process of the bottom of the oil return chamber 11.

[0050] In a further embodiment, the magnetic strength of the third magnet 52 can be adjusted to regulate its attraction to the second magnet 32. To adjust the distance between the second magnet 32 ​​and the third magnet 52, the magnetic strength of the third magnet 52 is increased to decrease the distance between them. At this time, the cleaning rotor 2 is in a suspended state, and the first cleaning section 21 is no longer in contact with the bottom of the oil return chamber 11. The cleaning fibers 223 of the second cleaning section 22 are used to adsorb and clean suspended impurities in the oil. This dual-position working mode allows the cleaning rotor 2 to switch flexibly according to the working conditions. It can perform scraping of sedimented impurities at the bottom or filtering and adsorbing of suspended impurities in the middle and upper parts.

[0051] During actual operation, the controller coordinates and controls the working state of the rotary drive mechanism 41 and the translation drive mechanism 42 according to the preset cleaning program or the real-time detected oil cleanliness data. When cleaning the bottom edge, the coupling component 3 is located below the bottom plate of the oil tank, the second magnet 32 ​​is coupled with the first magnet 23, and the cleaning rotor 2 rotates at the bottom of the return oil chamber 11 while reciprocating along the edge trajectory. The cleaning protrusions 211 and cleaning brushes 212 of the first cleaning section 21 act on the bottom and side wall edges respectively, peeling off the accumulated sludge and particulate impurities and pushing them to the central area of ​​the return oil chamber 11. The impurities in the central area can be discharged through the periodically opened drain valve.

[0052] The following is a detailed explanation of the multi-functional working modes of the cleaning rotor 2.

[0053] Sedimentation Cleaning Mode The rotation direction of the cleaning rotor 2 is opposite to or the same as the tilt direction of the cleaning scraper 221 or the cleaning bristles 223. For the cleaning scraper 221, the sludge adhering to the side wall of the return oil chamber 11 is cleaned based on the maintenance of the first working state and the second working state. For the cleaning bristles 223, the rotation speed is maintained in a certain rotation direction, and the rotation speed range is 30-60 rpm. At this time, the edge roller brush pushes the bottom sediment to the sludge collection tank, and the bottom protrusion scrapes off the hardened sludge.

[0054] Floating collection mode For the cleaning scraper 221, the cleaning rotor 2 can cycle in the order of its first working state, second working state and third working state; for the cleaning bristles 223, the rotation direction of the cleaning rotor 2 can be the same as or opposite to the tilt direction of the cleaning bristles 223, and its speed range is 60-120 rpm. At this time, the top roller brush rotates and adsorbs suspended dirt.

[0055] Defoaming mode For the cleaning blade 221, the cleaning rotor 2 cycles sequentially according to the first working state and the second working state; for the cleaning bristles 223, the rotation direction of the cleaning rotor 2 can be the same as or opposite to the tilt direction of the cleaning bristles 223, and its speed range is 120-180 rpm. At this time, the top roller brush rotates at high speed or alternates between forward and reverse rotation to shear and break up the fine air bubbles and promote the merging and floating of the air bubbles.

[0056] Comprehensive Cleaning Mode Within a cleaning cycle, sedimentation cleaning, suspension collection, and defoaming are performed sequentially.

[0057] Please see Figure 3 and Figure 15 In some embodiments, the overflow chamber 12 is provided with two to four partition plates 8, preferably three, dividing the overflow chamber 12 into multiple overflow chambers connected in series. Each partition plate 8 is fixedly provided with a filter screen 9. Along the direction from one side of the return oil chamber 11 to the suction oil chamber 13, the height of the filter screen 9 on the partition plate 8 gradually decreases, that is, the filter screen 9 on the first partition plate 8 near the return oil chamber 11 is the tallest, and the filter screen 9 on the last partition plate 8 near the suction oil chamber 13 is the shortest. This stepped arrangement allows the oil to pass through filter barriers of different heights in sequence during the overflow process. Large particles of impurities are trapped upstream, and only particles with progressively smaller diameters can pass through. Finally, the oil entering the suction oil chamber 13 undergoes multiple filtrations, significantly improving its cleanliness. The filter screen 9 is woven from stainless steel wire, and the mesh size decreases from 100 mesh to 300 mesh along the oil flow direction. The edge of the filter screen 9 is fixed to the frame of the partition plate 8 by pressure strips and bolts, making it easy to disassemble, clean, or replace.

[0058] Please see Figure 1 and Figure 14 The top of the fuel tank body 1 is equipped with a fuel tank cover 10. It is worth noting that the fuel tank cover 10 is made of non-metallic material, specifically engineering plastic or epoxy resin composite material. This material does not shield the magnetic coupling magnetic circuit, reduces the overall structural weight, and avoids corrosion problems. The fuel tank cover 10 may be equipped with vent holes and an air filter (not shown). A removable cover plate 101 is provided at the top of the fuel tank cover 10 of the return oil chamber 11. The removable cover plate 101 is located at the center of the return oil chamber 11. The size of the removable cover plate 101 is adapted to the cross-section of the return oil chamber 11. It is usually designed to be circular or rectangular, with a diameter or side length of 60% to 80% of the corresponding size of the return oil chamber 11, which ensures sufficient operating space while taking into account the structural strength of the cover plate. The removable cover plate 101 and the oil tank cover 10 body are sealed together by a sealing groove and an oil-resistant rubber sealing ring. The sealing ring is made of fluororubber with a Shore A70 to A85 hardness and a compression ratio controlled between 15% and 25%, ensuring no leakage within the range of hydraulic system working pressure fluctuations. Six to eight quick-release bolts are evenly distributed along the edge of the removable cover plate 101. The bolt heads are wing-shaped or knurled, facilitating quick and easy manual installation and removal without the need for special tools.

[0059] When maintenance or replacement of the cleaning rotor 2 is required, the operator first stops the drive mechanism, disconnects the power supply, and waits for the cleaning rotor 2 to come to a stop. Then, loosen the quick-release bolts on the removable cover plate 101 and remove the removable cover plate 101 along with the connecting drive rod 51 and the cleaning rotor 2. Since the connecting drive rod 51 is detachably connected to the second cleaning section 22, the cleaning rotor 2 can be further separated from the connecting drive rod 51 for cleaning or replacement of worn parts. During cleaning, the cleaning rotor 2 is placed in a dedicated cleaning tank and soaked and ultrasonically cleaned with a cleaning agent compatible with hydraulic oil to remove accumulated adhesive and metal particles from the cleaning fibers 223 and adsorption protrusions 222. After cleaning, the cleaning rotor 2 can be reused after drying and passing inspection.

[0060] Please see Figure 2 In some embodiments, oil level observation windows are provided on the sides of the oil return chamber 11, oil suction chamber 13, and overflow chamber 12. These windows are made of high-strength transparent polycarbonate, which has excellent impact resistance and oil resistance, and a light transmittance of no less than 88%, ensuring clear observation of the oil condition under various lighting conditions. The observation windows are fixedly connected to the oil tank body 1 via an embedded snap-fit ​​structure and a sealing gasket. The sealing gasket is made of nitrile rubber with a thickness of two to three millimeters, effectively preventing oil leakage and the intrusion of external contaminants.

[0061] The oil level observation window features an anti-fog coating and graduated markings (not shown). The anti-fog coating uses hydrophilic nano-silica material to prevent surface fogging caused by temperature changes, which could affect the observation effect. The graduated markings are in millimeters and cover the lowest working oil level to the highest permissible oil level in the tank cavity. The lowest and highest warning oil levels are marked in red and yellow respectively, allowing operators to quickly determine whether the oil level is within the normal range. The graduated markings are laser-engraved to a depth of 0.2 to 0.5 millimeters and filled with oil-resistant fluorescent paint, ensuring clear visibility even in low-light conditions.

[0062] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A hydraulic oil tank that facilitates internal cleaning, characterized in that, include: The oil tank body (1) has an inner cavity including an oil return chamber (11), an oil suction chamber (13) and an overflow chamber (12) located between the oil return chamber (11) and the oil suction chamber (13). The oil return chamber (11) and the oil suction chamber (13) are respectively connected to an oil return pipe (6) and an oil suction pipe (7). The cleaning rotor (2) is located at the bottom of the oil return chamber (11) and includes a first cleaning section (21) and a second cleaning section (22). The bottom and side surfaces of the first cleaning section (21) are provided with cleaning structures, which are configured to clean the bottom and side areas of the oil return chamber (11); The second cleaning section (22) is provided with a plurality of cleaning scrapers (221) along the circumferential direction, which are configured to clean the side wall of the oil return chamber (11) and collect suspended impurities in the oil return chamber (11); Drive assembly (4), located at the bottom or top outside the fuel tank body (1), includes: The coupling component (3) is magnetically coupled to the cleaning rotor (2); The drive mechanism is connected to the coupling component (3) and is configured to drive the coupling component (3) to rotate and change the planar position of the coupling component (3).

2. The hydraulic oil tank with easy internal cleaning according to claim 1, characterized in that, The cleaning structure includes a cleaning brush (212) and cleaning bumps (211); the cleaning brush (212) is evenly distributed circumferentially along the first cleaning section (21); the cleaning bumps (211) are evenly distributed on the bottom surface of the first cleaning section (21).

3. The hydraulic oil tank with easy internal cleaning according to claim 1, characterized in that, The cleaning scraper (221) has several adsorption bumps (222) arranged in an array on both sides.

4. The hydraulic oil tank with easy internal cleaning according to claim 3, characterized in that, The cleaning scraper (221) is made of any one of oil-resistant nylon, polyester fiber, and hydrogenated nitrile rubber; the adsorption bump (222) is made of any one of nitrile rubber, hydrogenated nitrile rubber, and fluororubber.

5. The hydraulic oil tank with easy internal cleaning according to claim 1, characterized in that, The cleaning rotor (2) is provided with a first magnet (23), which includes a plurality of magnetic cores (231) disposed in the cleaning rotor (2).

6. The hydraulic oil tank with easy internal cleaning according to claim 5, characterized in that, The coupling component (3) includes a limiting sleeve 31 and a second magnet (32) located in the limiting sleeve 31. The height of the second magnet (32) is greater than the depth of the limiting sleeve 31 and can be magnetically coupled to the first magnet (23).

7. The hydraulic oil tank with easy internal cleaning according to claim 3, characterized in that, It also includes a magnetic drive assembly (5), which includes a connecting drive rod (51) and a third magnet (52). One end of the connecting drive rod (51) is fixedly connected to the top of the second cleaning section (22), and the third magnet (52) is coaxially fixed to the other end of the connecting drive rod (51). The third magnet (52) can be magnetically coupled with the second magnet (32).

8. The hydraulic oil tank with easy internal cleaning according to claim 7, characterized in that, The driving component includes: A rotary drive mechanism (41) is fixedly connected to the coupling assembly (3) and configured to drive the second magnet (32) to rotate; The translation drive mechanism (42) is fixedly provided with a rotary drive mechanism (41), which is configured to drive the second magnetic block to reciprocate along the bottom edge trajectory of the oil return chamber (11) to complete the cleaning process of the bottom edge of the oil return chamber (11).

9. The hydraulic oil tank for easy cleaning of the inner cavity according to claim 8, characterized in that, The translation drive mechanism (42) includes a first displacement drive mechanism (421) and a second displacement drive mechanism (422) that are perpendicular to each other. Either the first displacement mechanism and the second displacement drive mechanism (422) are parallel to one side edge of the hydraulic oil tank, and the stroke of either the first displacement mechanism and the second displacement drive mechanism (422) is not less than the length of the return oil chamber (11), and the stroke of the other is not less than the width of the return oil chamber (11).

10. A cleaning method for a hydraulic oil tank as described in any one of claims 1-9, characterized in that, Includes the following steps: Sedimentation cleaning: The cleaning rotor (2) is driven by the drive assembly (4) to move along the edge of the oil return chamber (11) while rotating at low speed in a clockwise or counterclockwise direction to scrape off the sludge attached to the bottom and sides and push it into the sludge collection trough located at the bottom of the oil return chamber (11); Suspension collection: While driving the cleaning rotor (2) to move along the edge of the oil return chamber (11), the state switching of the cleaning rotor (2) is completed in the order of clockwise rotation, counterclockwise rotation and stop rotation, adsorbing suspended dirt in the oil along the way; Defoaming treatment: Drive the cleaning rotor (2) to the middle area of ​​the oil return chamber (11) and simultaneously complete the high-speed rotation of clockwise and counterclockwise rotation in sequence to shear and break up the fine bubbles and promote the merging and floating of the bubbles.

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