Oil tank cleaning device and oil tank cleaning method

Abstract

The invention belongs to the technical field of composite material oil tank cleaning, and particularly relates to an oil tank cleaning device and an oil tank cleaning method. The invention provides an oil tank cleaning device. The oil tank cleaning device comprises a swing main shaft; the supporting frames are connected to the two sides of the swinging main shaft; the swing frame comprises a cleaning platform, a hanging rod, a binding belt, a connecting hole positioner and a base; the hanging rod is rotationally connected with the swinging main shaft; the vibration motor is fixedly connected with the cleaning platform, and the vibration motor enables the swing frame to generate vibration; the telescopic device is connected with the base, and the telescopic device enables the swing frame to swing. The invention further provides an oil tank cleaning method which comprises the steps that the oil tank to be cleaned is placed on the cleaning platform of the oil tank cleaning device, so that a tank cover of the oil tank is matched with the connecting hole positioner; the fuel tank is fixed to the cleaning platform through the binding band, and aviation kerosene is added; the vibration motor and the telescopic device are started, and the oil tank is cleaned; and the aviation kerosene is discharged, and cleaning is completed.

Description

Technical Field

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

[0002] Carbon fiber composites, as an advanced aerospace material, are widely used in advanced manufacturing fields due to their lightweight and high strength, enabling lightweight development. Aerospace fuel control systems are extremely precise and complex, with most fuel filter elements ranging in size from 10 to 60 μm. To prevent fuel system components from being contaminated by solid particles and fibers in the fuel medium, it is essential to ensure that the solid particle contamination level of the fuel tank meets operational requirements.

[0003] Small-sized fuel tanks feature a refined structural design, characterized by poor openness and confined space, with irregularly shaped structures such as grooves, bosses, recesses, partitions, ribs, and flanges inside. During fuel tank assembly, processes involving grinding, filling, and sealing with rubber screws can leave behind solid particles and fibers such as chips and adhesive residue inside the tank. Traditional methods such as direct flushing, suction, rinsing, soaking, and semi-automatic oscillation are insufficient to thoroughly clean the irregularly shaped and confined areas inside the tank. Furthermore, during flight, static particles and excess material can enter the fuel system under vibration conditions. Summary of the Invention

[0004] The purpose of this invention is to address the problem of poor cleaning results in existing traditional methods by providing a fuel tank cleaning device and method. The fuel tank is fixed to a cleaning platform using straps and connector locators. A vibration motor and telescopic device drive the platform and fuel tank to swing and clean. The wide-angle swinging and vibration of the fuel tank causes the aviation kerosene to generate a spiral wave, thus increasing the impact force of the kerosene. Simultaneously, through the targeted design of the oil pipes, internal cleaning of small-sized, complex composite material fuel tanks is achieved.

[0005] The first aspect of the present invention provides a fuel tank cleaning device, comprising:

[0006] Swing spindle;

[0007] A pair of support frames connected to both sides of the swing shaft;

[0008] A swing frame, comprising a cleaning platform, a boom, straps, a connector locator, and a base; the boom is rotatably connected to the swing main shaft;

[0009] A vibration motor is fixedly connected to the cleaning platform, and the vibration motor causes the swing frame to vibrate.

[0010] A telescopic device is connected to the base, which causes the swing frame to swing.

[0011] Furthermore, the boom clamps the oscillating main shaft via bearings, thereby rotatably connecting the boom to the oscillating main shaft.

[0012] Furthermore, the swing spindle is provided with a limiting block to restrict the boom.

[0013] Furthermore, the pair of support frames are fixedly connected to the same support base.

[0014] Furthermore, the other end of the telescopic device is attached to the support base, and the telescopic device includes a hydraulic pump and a hydraulic telescopic rod.

[0015] Furthermore, the telescopic device is fixedly connected to the support base by screws.

[0016] A second aspect of the present invention provides a method for cleaning a fuel tank, the steps of which include:

[0017] Place the oil tank to be cleaned on the cleaning platform of the oil tank cleaning device, so that the tank cover fits into the port locator.

[0018] The fuel tank is secured to the cleaning platform using the straps, and aviation kerosene is added.

[0019] Start the vibration motor and the telescopic device to clean the oil tank;

[0020] The aviation kerosene is drained, completing the cleaning process.

[0021] Furthermore, the telescopic device enables the swing angle of the swing frame to be ±30 degrees and the swing speed to be 10 degrees / second; the vibration motor is selected to be 220V and has a power of 120W.

[0022] Furthermore, the aviation kerosene is added through the filling port of the fuel tank and discharged through the outlet of the fuel tank.

[0023] Furthermore, the cleaning process is completed through a pre-set cycle.

[0024] The beneficial effects of this invention are as follows:

[0025] (1) The present invention can generate two synergistic combined cleaning modes, and the resulting wave-shaped impact force can thoroughly clean the irregular and narrow areas inside the oil tank, ultimately achieving the purpose of improving the cleanliness of small-sized complex cavity composite material oil tanks.

[0026] (2) The cleaning fixture of the present invention has a simple structure, which changes the traditional oil tank cleaning method. It does not require manual operation and realizes the automation of cleaning complex cavity oil tanks. It provides reference and reference for cleaning similar composite material oil tanks.

[0027] (3) The cleaning method of the present invention checks whether the cleaning is qualified by detecting the cleaning liquid and the particulate matter on the filter paper, so that the cleaning process can continue continuously and repeatedly, ensuring that the composite material oil tank is clean. Attached Figure Description

[0028] Figure 1 This is a front view of the composite material oil tank cleaning device of the present invention;

[0029] Figure 2 This is a schematic diagram of the composite material oil tank cleaning device of the present invention;

[0030] Figure 3 This is an enlarged view of the composite material oil tank cleaning device of the present invention.

[0031] Figure 4 This is a schematic diagram of the oil tank adapted to the composite material oil tank cleaning device of this invention.

[0032] Figure 5 This is a flowchart of the fuel tank cleaning method of the present invention.

[0033] 0. Swing spindle; 1. Composite material oil tank; 2. Straps; 3. Vibration motor; 4. Limit block; 5. Support frame; 6. Hydraulic telescopic rod; 7. Spindle wing; 8. Filling port; 9. Oil outlet; 10. Connecting hole positioner. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] The first aspect of this embodiment provides a novel small-sized complex cavity composite material oil tank cleaning device, such as... Figures 1-3 As shown.

[0036] In this embodiment, the novel small-sized complex cavity composite material oil tank cleaning device includes a support frame 5. The composite material oil tank 1 to be cleaned is fixedly installed on a vibrating swing cleaning platform equipped with a connector 10 by straps 2. At the same time, the front section of the cleaning fixture is equipped with a limit block 4, which doubles the protection that the oil tank cannot shake itself or be disturbed by the ejector 7 during the cleaning process. The swing cleaning platform is equipped with a swing device and a vibration motor, which drive the swing cleaning platform and the composite material oil tank on it to swing and vibrate left and right together for cleaning.

[0037] In this embodiment, the base of the oil tank cleaning device is a frame structure, which is placed stably on the ground; the swing cleaning device is installed on the side support frame of the cleaning platform base through the swing main shaft 0, which drives the swing cleaning platform to swing left and right; the miniature eccentric vibration motor 3 is located directly below the cleaning platform; the support frame 5 of the oil tank cleaning device is provided with 6 platform support columns, which are distributed on the bottom central axis of the swing cleaning platform and connected to the swing cleaning platform through the fulcrum bearing assembly, for supporting the swing cleaning platform to swing left and right and vibrate.

[0038] In some embodiments, the frame structure is an upper and lower frame structure. The upper frame is rotatably connected to the lower frame via two bearings. To prevent the upper frame from moving horizontally due to impact, limit blocks and hole locators are provided on both sides of the upper frame bearings. The lower frame base is provided with polyurethane pads.

[0039] In some embodiments, the swing device bearing assembly is located on the bottom side of the cleaning platform, and the actuating elements include hydraulic pumps, hydraulic telescopic rods 6, etc. The hydraulic telescopic rods 6 are connected to the swing device, enabling the swing cleaning platform to swing in an arc on the base support.

[0040] In some embodiments, the vibration motor is a miniature eccentric vibration motor, which is mounted with screws directly below the cleaning platform, and the motor generates excitation force along an elliptical direction.

[0041] The second aspect of this embodiment discloses a fuel tank adapted to the fuel tank cleaning device of the present invention, specifically a novel lightweight small-sized UAV fuel tank, comprising a large-opening rotating body, a lower cover plate, and an air inlet; the large-opening rotating body includes an anti-sway plate and a reinforcing rib structure; the lower cover plate is located below the large-opening rotating body, and one end of the air inlet extends into the interior of the large-opening rotating body; the large-opening rotating body, the lower cover plate, and the air inlet are sealed together by rubber screws, such as... Figure 4 As shown (fill port and oil inlet are not shown in the diagram).

[0042] In this embodiment, the composite material fuel tank with a large open rotating body optimizes its topological space structure according to sealing requirements. Its interior features π-shaped, square, flanged, boss, and ribbed structures. The anti-sway plates, wall panels, and reinforcing ribs are bonded later, reducing the difficulty of fuel tank molding. The overall rigid structure of the fuel tank and the later-bonded reinforcing ribs improve its pressure resistance while saving space and increasing its fuel-carrying capacity.

[0043] In this embodiment, the molding material system of the composite fuel tank includes fiber-reinforced resin prepreg (unidirectional, carbon cloth), a film, and a liquid adhesive. The fiber is carbon fiber, and the fiber type is selected according to the product's structural characteristics and design load-bearing capacity, such as one of T700, T800, or T1100 grades. The reinforcing fabric can be one of T800-6k, T300-3k, T700-3k, CF8611 plain weave fabric, or twill weave fabric. The resin type can be one of 9368, 8522, 8210, 3234, 3221, 6808, or 9A16. The film is one of J-47A, J-78B, J-95, 271B, or HDG-01. The liquid adhesive is one of J-47B, J-22, or J-139.

[0044] In this embodiment, the composite material fuel tank has a molding structure of inner skin + thickened area + thickened area + outer skin. The thickness of the inner skin of the large open rotating body of the composite material fuel tank is 1.8-2.4mm, and the thickness of the outer skin is 1.8-2.4mm; the thickness of the inner skin of the lower cover plate of the composite material fuel tank is 1.8-2.4mm; the thickness of the inner skin of the air intake duct of the composite material fuel tank is 1.8-2.4mm; the total thickness of the reinforcing ribs, anti-sway plates and wall panels is 1-2.5mm; the total thickness of the embedded square blocks and embedded rhomboid blocks is 10-15mm, and the total thickness of the embedded columnar blocks is 8-12mm.

[0045] The third aspect of this embodiment provides a novel method for cleaning small-sized complex cavity composite material fuel tanks, the process of which is as follows: Figure 5 As shown, it includes the following steps:

[0046] Step 1: Complete the airtightness test of the composite material fuel tank, and prepare the tooling and RP-3 kerosene.

[0047] Step 2: Position the composite material oil tank to be cleaned on the locator 10 of the swing cleaning platform according to the design orientation. At the same time, use the limit block 4 and the strap 2 to fix the oil tank on the cleaning platform to prevent the oil tank from shaking.

[0048] Step 3: Use screws to install the miniature eccentric vibration motor 3 directly below the cleaning platform;

[0049] Step 4: Pour 1.5L of aviation kerosene into the composite material tank to be cleaned through filler port 8, and then close the tank cover.

[0050] Step 5: Preferably, the swing angle is set to ±30 degrees, the swing speed is 10 degrees per second, and the parameters of the miniature eccentric vibration motor are selected as 220V and 120W.

[0051] Step 6: Open the oil outlet 9 to drain the kerosene completely, add 1.5L of RP-3 aviation kerosene through the filling port 8, and close the tank cap.

[0052] Step 7: Open the oil outlet 9 to drain the kerosene completely, and add 1.5L of RP-3 aviation kerosene again through the filling port 8. While cleaning, circulate and replace the RP-3 aviation kerosene 10 times.

[0053] Step 8: After cleaning, use a particle size analyzer to check the NAS cleanliness level of the cleaning solution, use a high-power micro microscope to observe the particle size of the filtered cleaning solution, replace the cleaning solution, and repeat steps 4 and 7 until the cleanliness meets the requirements.

[0054] In the aforementioned method of using the composite material oil tank cleaning fixture, in step one: the composite material oil tank cleaning fixture is moved by a hoisting method; wherein, the lifting lugs are fitted on both sides of the cleaning fixture; the filter screen used in step one has a specification of 10μm.

[0055] The relevant test results of the oil tank after cleaning with the novel small-sized complex cavity composite material oil tank cleaning tool of the present invention are shown in Table 1.

[0056] Table 1

[0057] Testing items Indicator Requirements Measured value NAS Class Meets NAS Level 8 NAS Level 5 Particle size The number of particles on the 10μm filter screen is less than 10. 6 airtight 0.15MPa, pressure maintained for 2 hours without pressure drop. No pressure drop negative pressure -70KPa, no leakage under pressure for 20 minutes. No leaks Oil seepage 0.1MPa, pressure held for 48 hours with no leakage No leakage

[0058] It is worth noting that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of any conflict between the solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0059] Furthermore, without departing from the scope of the present invention, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel tank cleaning device, comprising: Swing spindle; A pair of support frames connected to both sides of the swing shaft; A swing frame, comprising a cleaning platform, a boom, straps, a connector locator, and a base; the boom is rotatably connected to the swing main shaft; A vibration motor is fixedly connected to the cleaning platform, and the vibration motor causes the swing frame to vibrate. A telescopic device is connected to the base, which causes the swing frame to swing.

2. The apparatus according to claim 1, characterized in that, The boom clamps the oscillating main shaft via bearings, thereby rotatably connecting the boom to the oscillating main shaft.

3. The apparatus according to claim 1, characterized in that, The swing spindle is provided with a limiting block to restrict the boom.

4. The apparatus according to claim 1, characterized in that, The pair of support frames are fixedly connected to the same support base.

5. The apparatus according to claim 4, characterized in that, The other end of the telescopic device is located at the support base, and the telescopic device includes a hydraulic pump and a hydraulic telescopic rod.

6. The apparatus according to claim 5, characterized in that, The telescopic device is fixedly connected to the support base by screws.

7. A method for cleaning a fuel tank, comprising the following steps: The oil tank to be cleaned is placed on the cleaning platform of any one of the oil tank cleaning devices according to claims 1-5, such that the tank cover of the oil tank is fitted with the port locator. The fuel tank is secured to the cleaning platform using the straps, and aviation kerosene is added. Start the vibration motor and the telescopic device to clean the oil tank; The aviation kerosene is drained, completing the cleaning process.

8. The method according to claim 7, characterized in that, The telescopic device enables the swing angle of the swing frame to be ±30 degrees and the swing speed to be 10 degrees / second; the vibration motor is selected with parameters of 220V and power of 120W.

9. The method according to claim 7, characterized in that, The aviation kerosene is added through the filling port of the fuel tank and discharged through the outlet of the fuel tank.

10. The method according to claim 7, characterized in that, The cleaning process is completed through a preset cycle.

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