A long vibration life fuel tank, construction machinery and a design selection method thereof

Abstract

The application discloses a long-vibration-life fuel tank, engineering machinery and a design selection method thereof, and comprises a tank body, an ear plate, a vertical partition plate, a horizontal partition plate and the like. The position of the partition plate can be adjusted, the change of the fuel tank mode is realized through the adjustment of the posture of the partition plate, and resonance or low-order mode excitation caused by the change of a working environment and a working condition is avoided. Meanwhile, a control method of the long-vibration-life fuel tank is provided, and the influence of factors such as a fuel liquid level on the overall mode of the fuel tank is fully considered. Compared with the buffer device which can only weaken the vibration amplitude, the application is started from the vibration characteristics of the components, the vibration of the components is actually weakened, and the reliability is improved.

Description

Technical Field

[0001] This invention relates to a long vibration life fuel tank, engineering machinery, and its design and selection method, belonging to the field of engineering machinery technology. Background Technology

[0002] Construction machinery is developing towards higher power and more multifunctionality, but the resulting large impacts and strong vibrations have highlighted fatigue failure issues in system components such as fuel tanks. The fuel tank is a major component of the vehicle's power system, and its fatigue life is crucial for vehicle operation. However, cracks or fractures often occur in the base material and welds at locations such as the inner partition and bottom mounting beams, leading to fuel leaks, vehicle downtime, and impacts on the environment, the vehicle itself, and customer perception.

[0003] To meet the needs of different customer groups, construction machinery products are generally available in a wide range of tonnage sizes. During the design process, different tonnage sizes may utilize fuel tanks from existing, mature products. Different tonnages of construction machinery result in significant differences in their primary operating conditions. These differences in operating conditions cause changes in the main vibration sources and vibration excitation frequencies. When these frequencies coincide with a certain mode of the fuel tank, resonance can easily occur, leading to vibration fatigue failure.

[0004] Currently, fuel tanks used in construction machinery are generally rigidly connected to the vehicle frame with bolts, and their internal partitions are directly connected to the fuel tank body by welding. Different tonnage classes of construction machinery sometimes directly share fuel tanks. This existing technology has the following drawbacks: 1) The main structure of the fuel tank is welded and fixed, and its vibration mode is fixed. When the usage environment or vehicle model changes, the difference in working conditions causes changes in the main vibration source and vibration excitation frequency. When it coincides with a certain mode of the fuel tank, resonance is likely to occur, causing vibration fatigue failure. 2) The design of the fuel tank did not fully consider the impact of factors such as fuel level on the overall modal characteristics of the fuel tank; 3) The internal baffle of the fuel tank is directly welded to the fuel tank body. Since both are thin plates, the thermal deformation caused by welding can easily lead to stress concentration, which can then become a point of fracture risk. 4) Because the fuel tank is directly connected to the vehicle frame, the vibration source excitation can be directly transmitted to the fuel tank, causing vibration fatigue failure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fuel tank with a long vibration life, engineering machinery and its design and selection method. By adjusting the attitude of the baffle, the mode of the fuel tank can be changed, thus solving the problem of vibration fatigue failure caused by resonance.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a fuel tank with a long vibration life, comprising a fuel tank body and a fuel tank bottom bracket connected to the bottom of the fuel tank body; The fuel tank body is provided with a vertical adjustment partition one, a vertical adjustment partition two, and a horizontal adjustment partition; The positions of the vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all adjustable.

[0007] Furthermore, the first and second vertical adjustment partitions can slide vertically in the vertical ear plate via a telescopic mechanism; the horizontal adjustment partition can slide horizontally in the horizontal ear plate via a telescopic mechanism. By adjusting the positions of vertical adjustment partition one, vertical adjustment partition two, and horizontal adjustment partition, different adjustment postures can be formed.

[0008] Furthermore, a vertical ear plate and a horizontal ear plate are also fixedly installed inside the fuel tank.

[0009] The vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all connected via... Both the vertical and horizontal ear plates are connected to the fuel tank body by welding.

[0010] Vertical and horizontal ear plates can avoid direct welding connection between the partition and the two thin plates of the housing.

[0011] Furthermore, the vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all of the following structures, with a central bending structure.

[0012] Furthermore, the tank body is four-sided pressed, and the bottom support of the tank is a closed structure; The fuel tank body is connected to the bottom support of the fuel tank by welding.

[0013] Furthermore, the fuel tank also includes a metal-rubber shock absorber; The metal-rubber shock absorber is located between the bottom bracket of the fuel tank and the vehicle frame, enabling a flexible connection between the fuel tank body and the vehicle frame.

[0014] Furthermore, the direction of the elastic main axis of the metal-rubber shock absorber is selected according to the vehicle's own operating characteristics: When the vehicle load is mainly vertical, an axially flexible spindle should be selected. When the vehicle sways left and right or back and forth, select the radial elastic spindle.

[0015] Furthermore, eight metal rubber shock absorbers are installed at the bottom of the fuel tank bottom support; The elastic main axis of the four corner metal rubber vibration dampers is the axial direction of the oil tank installation, while the elastic main axis of the other four metal rubber vibration dampers is the radial direction of the oil tank installation.

[0016] Secondly, the present invention provides an engineering machine equipped with the long vibration life fuel tank described in the first aspect.

[0017] Thirdly, the present invention provides a design and selection method for a fuel tank with long vibration life, including: Based on the fuel tank mentioned in the first aspect, according to user survey statistics, the common operating conditions and the percentage of operating time for machinery that requires the installation of fuel tanks are analyzed. By comparing the test database, the contribution ratio of each working condition to the vibration fatigue damage of the fuel tank was calculated, and the working conditions with larger contributions were screened and their vibration excitation sources were identified. Determine the main excitation frequencies based on the corresponding test database; The attitude of the fuel tank baffle is determined by the corresponding modal adjustment attitude library to ensure that the fuel tank mode avoids the above-mentioned identification excitation frequency. The fuel tank mode calculation takes into account the influence of fuel level on the overall fuel tank mode. The ear plates and internal partitions are connected by welding.

[0018] Furthermore, the modal calculation of the fuel tank is obtained through modal testing or finite element simulation.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. By adjusting the attitude of the baffle, the mode of the fuel tank can be changed, avoiding fuel tank resonance or low-order mode excitation caused by changes in the working environment and working conditions; the inner baffle is connected to the fuel tank body through the ear plate, avoiding large thermal deformation and welding residual stress concentration caused by welding of thin plates. 2. The baffle has a central bending structure, which can absorb some of the vibration energy through deformation when the oil tank vibrates, thereby improving the vibration fatigue reliability of the baffle; 3. The tank body is four-sided pressed, and the bottom support of the fuel tank is a closed structure, which strengthens the strength of the fuel tank; 4. The installation of metal-rubber shock absorbers on the bottom bracket of the fuel tank enables a soft connection between the fuel tank body and the vehicle frame. The direction of the flexible main shaft can be selected according to the vehicle's own operating characteristics, which can effectively attenuate low-frequency, large-amplitude vibrations. 5. A design and selection method for long-vibration-life fuel tanks fully considers the impact of factors such as fuel level on the overall modal characteristics of the fuel tank. When products of different tonnage levels share fuel tanks, this method can be used to match the appropriate fuel tank baffle posture. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the vibration fatigue life of the fuel tank. Attached Figure Description

[0020] Figure 1 A perspective view of a long vibration life fuel tank as an example; Figure 2 This is an internal schematic diagram of a long vibration life fuel tank as an example. Figure 3 Example 1: Adjustment posture of a fuel tank with long vibration life; Figure 4 Example 2: Adjustment posture of a fuel tank with long vibration life; Figure 5 This is a flowchart illustrating the design and selection process for a long-vibration-life fuel tank attitude adjustment system, as shown in the example. In the diagram: 1. Fuel tank body; 2. Fuel tank bottom support; 3. Metal rubber shock absorber; 4. Vertical ear plate; 5. Vertical adjustment partition one; 6. Vertical adjustment partition two; 7. Horizontal adjustment partition; 8. Horizontal ear plate. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0022] Example 1: like Figures 1 to 4 This embodiment provides a fuel tank with a long vibration life, including a fuel tank body 1, a fuel tank bottom support 2, a metal rubber vibration damper 3, a vertical ear plate 4, a vertical adjustment partition 1 5, a vertical adjustment partition 2 6, a horizontal adjustment partition 7, and a horizontal ear plate 8; the position of the partitions can be adjusted, and the mode of the fuel tank can be changed by adjusting the posture of the partitions. Fuel tank body 1, the body includes four-sided pressing, the pressing can increase the rigidity of the body.

[0023] The fuel tank bottom bracket 2 is a closed "U" shape to ensure bracket rigidity. The installation of metal-rubber shock absorbers 3 on the fuel tank bottom bracket 2 enables a flexible connection between the fuel tank body and the vehicle frame. The fuel tank bottom bracket 2 also has eight mounting holes for placing the metal-rubber shock absorbers 3. The fuel tank body 1 and the fuel tank bottom bracket 2 are connected by welding. The metal-rubber shock absorber 3 is located between the fuel tank bottom bracket 2 and the vehicle frame, enabling a flexible connection between the fuel tank body and the vehicle frame. The direction of the elastic main axis of the metal-rubber shock absorber 3 can be selected according to the vehicle's own operating characteristics. Taking a rock-breaking excavator as an example, when breaking rocks, the main vibration excitation direction is the fuel tank mounting axis; when using a chisel to move rocks to other positions, the main vibration excitation direction is the fuel tank mounting vertical direction. Therefore, the elastic main axis of the metal-rubber shock absorbers 3.1 installed at the four corners is the fuel tank mounting axis, and the elastic main axis of the metal-rubber shock absorbers 3.2 installed at the other four positions is the fuel tank mounting radial direction. Each suspension has low-frequency, high-damping, and high-stiffness characteristics, which can effectively attenuate low-frequency, large-amplitude vibrations.

[0024] The vertical ear plate 4 and the horizontal ear plate 8 are connected to the fuel tank body 1 by welding. The vertical ear plate 4 and the horizontal ear plate 8 can avoid the direct welding connection between the partition and the two thin plates of the tank body, reducing the impact of welding thermal deformation and welding residual stress on the vibration fatigue life of the weld.

[0025] The internal baffle of the fuel tank is connected to the fuel tank body via a lug plate, avoiding large thermal deformation and welding residual stress concentration caused by welding thin plates. The vertical adjustment baffle 1 (5), vertical adjustment baffle 2 (6), and horizontal adjustment baffle 7 have a central bending structure, which can absorb some of the vibration energy through deformation when the fuel tank vibrates, improving the vibration fatigue reliability of the baffle.

[0026] Vertical adjustment baffles 5 and 6 can slide vertically within the vertical ear plate 4 via a telescopic mechanism; horizontal adjustment baffle 7 can slide horizontally within the horizontal ear plate 8 via a telescopic mechanism. Different adjustment postures can be achieved by adjusting the positions of vertical adjustment baffles 5, 6, and 7. The vibration modes of the long-vibration-life fuel tank baffles will change when they are in different adjustment postures.

[0027] Specifically, when using existing fuel tanks, construction machinery of different tonnage levels can match the appropriate fuel tank baffle posture according to its own operating characteristics. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the vibration fatigue life of the fuel tank.

[0028] This fuel tank design fully considers the impact of factors such as fuel level on the overall modal characteristics of the fuel tank. When products of different tonnage levels borrow fuel tanks, the corresponding fuel tank partition posture can be matched according to this method. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the vibration fatigue life of the fuel tank.

[0029] Example 2: This embodiment provides an engineering machinery, including the long vibration life fuel tank described in Embodiment 1.

[0030] When using existing fuel tanks, different tonnage classes of construction machinery should match the appropriate fuel tank baffle orientation according to their own operating characteristics. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the fuel tank's vibration fatigue life. After determining the baffle orientation, the baffle and connecting lugs are completely fixed by welding.

[0031] For a specific fuel tank, its modes are already determined. When construction machinery of different tonnage classes borrows an existing fuel tank, the main vibration excitation frequency caused by its operating characteristics will also change. When the excitation frequency coincides with a certain mode of the fuel tank, resonance will occur. By changing the attitude of the fuel tank baffle, the fuel tank mode is changed, thus avoiding coincidence with the excitation frequency.

[0032] Example 3: This embodiment provides a design and selection method for fuel tanks with long vibration life. When using existing fuel tanks, construction machinery of different tonnage levels can match the appropriate fuel tank baffle posture according to its own operating characteristics. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the vibration fatigue life of the fuel tank.

[0033] The orientation selection of the partition follows the following Figure 5 The design and selection method for long vibration life fuel tanks is shown.

[0034] Determine the model of the aircraft that needs to borrow the aforementioned fuel tanks; According to user surveys, this product commonly operates under certain conditions and the percentage of time spent on these conditions. By comparing the test database, the contribution ratio of each working condition to the vibration fatigue damage of the fuel tank was calculated, and the working conditions with larger contributions were screened and their vibration excitation sources were identified. For example, when a vehicle is driving on the road, the main source of vibration excitation for the fuel tank is the road surface or the running gear. For example, when a vehicle is in harsh working conditions, such as a rotary drilling rig dumping soil or drilling hard rock, or a rock breaking excavator, the main source of vibration excitation for the fuel tank is the working device.

[0035] Identify the vibration excitation source with the greatest impact, correspond it to the test database, and determine its main excitation frequency; If the engine is identified as the source of the greatest vibration excitation, but the fundamental frequency of the engine changes when the engine is at different speeds, the vibration characteristics of the fuel tank will also change. If the road surface is identified as the source of the greatest vibration excitation, then road surfaces such as Belgian roads, long-wave roads, short-wave roads, fish-scale pit roads, and mining road all have their characteristic excitation frequencies. If the most influential vibration excitation source is identified as the running gear, for wheeled vehicles, the main excitation frequency originates from the tires; for tracked vehicles, the excitation frequency originates primarily from the tracks. However, the vibration excitation frequency changes as the vehicle travels at different speeds. If the operating device is identified as the source of the greatest vibration excitation, for example, in the case of a rotary drilling rig working on rock and soil, the main vibration excitation frequency depends on the switching speed of the drill bit rotation control handle; in the case of rotary drilling on hard rock, the main vibration excitation frequency depends on the rotary drilling speed of the drill bit; and in the case of a rock crushing excavator, the main vibration excitation frequency depends on the crushing gear.

[0036] The corresponding modal adjustment posture library is used to determine the posture of the fuel tank partition, ensuring that the fuel tank mode avoids the above-mentioned identification excitation frequency. The fuel tank modal calculation takes into account the influence of factors such as fuel level on the overall fuel tank mode. Finally, the ear plates and internal partitions are connected by welding.

[0037] This method fully considers the influence of factors such as fuel level on the overall mode of the fuel tank. When products of different tonnage levels borrow fuel tanks, the corresponding fuel tank partition posture can be matched according to this method. This avoids the main vibration excitation frequency coinciding with a certain mode of the fuel tank, which could lead to resonance and reduce the vibration fatigue life of the fuel tank.

[0038] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0039] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0040] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0041] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fuel tank with long vibration life, characterized in that, Includes a fuel tank body and a fuel tank bottom bracket connected to the bottom of the fuel tank body; The fuel tank body is provided with a vertical adjustment partition one, a vertical adjustment partition two, and a horizontal adjustment partition; The positions of the vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all adjustable; The fuel tank body is also fixedly equipped with vertical and horizontal ear plates. The vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all connected to the fuel tank body through vertical and horizontal ear plates; Both the vertical and horizontal ear plates are connected to the fuel tank body by welding. The vertical adjustment partition one, the vertical adjustment partition two, and the horizontal adjustment partition are all of the same type with a central bending structure. By adjusting the vertical adjustment baffle one, the vertical adjustment baffle two, and the horizontal adjustment baffle, the fuel tank mode can be changed, thus avoiding fuel tank resonance caused by changes in the working environment and working conditions.

2. The long vibration life fuel tank according to claim 1, characterized in that, The first and second vertical adjustment partitions can slide vertically in the vertical ear plate via a telescopic mechanism; the third horizontal adjustment partition can slide horizontally in the horizontal ear plate via a telescopic mechanism. By adjusting the positions of vertical adjustment partition one, vertical adjustment partition two, and horizontal adjustment partition, different adjustment postures can be formed.

3. The long vibration life fuel tank according to claim 1, characterized in that, The tank body is four-sided pressed, and the bottom support of the oil tank is a closed structure; The fuel tank body is connected to the bottom support of the fuel tank by welding.

4. The long vibration life fuel tank according to claim 1, characterized in that, The fuel tank also includes a metal rubber shock absorber; The metal-rubber shock absorber is located between the bottom bracket of the fuel tank and the vehicle frame, and is used to achieve a soft connection between the fuel tank body and the vehicle frame.

5. The long vibration life fuel tank according to claim 4, characterized in that, The direction of the elastic axis of the metal-rubber shock absorber is selected according to the vehicle's own operating characteristics: When the vehicle load is mainly vertical, an axially flexible spindle should be selected. When the vehicle sways left and right or back and forth, select the radial elastic spindle.

6. The long vibration life fuel tank according to claim 4, characterized in that, Eight metal rubber vibration dampers are installed at the bottom of the fuel tank bottom support; The elastic main axis of the four corner metal rubber vibration dampers is the axial direction of the oil tank installation, while the elastic main axis of the other four metal rubber vibration dampers is the radial direction of the oil tank installation.

7. An engineering machinery, characterized in that, It is equipped with a long vibration life fuel tank as described in any one of claims 1-6.

8. A design and selection method for a fuel tank with long vibration life, characterized in that, include: Based on the fuel tank as described in any one of claims 1-6, according to user survey statistics, the common operating conditions and the percentage of operating time for machinery that requires the installation of fuel tanks are analyzed. By comparing the test database, the contribution ratio of each working condition to the vibration fatigue damage of the fuel tank was calculated, and the working conditions with larger contributions were screened and their vibration excitation sources were identified. Determine the main excitation frequencies based on the corresponding test database; The attitude of the fuel tank baffle is determined by the corresponding modal adjustment attitude library to ensure that the fuel tank mode avoids the excitation frequency. The fuel tank modal calculation takes into account the influence of fuel level on the overall fuel tank mode. The ear plates and internal partitions are connected by welding.

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