Design method of aerial ladder fire truck aerial work platform leveling hydraulic system

Abstract

The invention discloses a design method for a leveling hydraulic system of an aerial work platform of an aerial ladder fire truck. The method comprises the following steps: determining the use condition of the leveling hydraulic system of the aerial work platform of the aerial ladder fire truck; the additive manufacturing technology is applied to multi-element integrated fusion design of the leveling hydraulic system of the aerial ladder fire truck high-altitude working platform, targeted lightweight treatment and element fusion design are conducted, and high integration of a shell power part and a control part of the leveling hydraulic system is achieved; and the opening direction of the cavity and the directions of a flow channel and a suspension structure are redesigned according to the forming characteristics of additive manufacturing, the weight and pressure loss of an integrated assembly are greatly reduced, and the method has important significance on light weight and integration of a leveling hydraulic system of a high-altitude working platform of an aerial ladder fire truck.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of hydraulic transmission control, and in particular to a design method for a leveling hydraulic system for an aerial work platform of a ladder fire truck. Background Art

[0002] A ladder fire truck is a special fire truck specially designed for responding to high-rise building fires and high-altitude rescue. It is equipped with a retractable ladder or mechanical arm, and the end of the ladder is also equipped with an aerial work platform. The key role of the aerial work platform is the leveling hydraulic system, which is responsible for the realization of functions such as the folding and unfolding, angle adjustment and leveling of the work platform. Ladder fire trucks have played an important role in high-altitude firefighting and rescue, but the leveling hydraulic system of the ladder fire truck's working platform has disadvantages such as low adjustment efficiency, small load, heavy weight, and large volume. Metal additive manufacturing technology provides a possibility for the integrated and lightweight design of the leveling hydraulic system, but the design method based on additive manufacturing technology is currently almost blank. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a design method for a leveling hydraulic system of an aerial work platform of a ladder fire truck, which is used to realize the integration and lightweight design of the leveling hydraulic system using metal additive manufacturing technology.

[0004] A design method for a leveling hydraulic system of an aerial work platform of a ladder fire truck, the method comprising the following steps:

[0005] (1) Determine the operating conditions of the hydraulic system for leveling the aerial work platform of the ladder fire truck;

[0006] (2) Optimizing the hydraulic principle diagram, dividing the system into functions and selecting integration objects, and matching and selecting parameters of hydraulic components according to the operating conditions of step (1);

[0007] (3) Determine the four major constraints of forming, processing, installation and performance;

[0008] (4) Minimum envelope layout design of spatial cavity plane mapping;

[0009] (5) Fusion design of components and special-shaped oil tanks, as well as local lightweight design and sealing design;

[0010] (6) Design downstream low pressure loss flow channels;

[0011] (7) Statics optimization and simulation of flow channel pressure loss in leveling hydraulic system;

[0012] (8) Additive manufacturing and heat treatment of prototypes;

[0013] (9) Prototype assembly and function and performance testing.

[0014] Specifically, the operating conditions of the leveling hydraulic system of the aerial work platform of the ladder fire truck are determined including the system rated and limit working pressures, system flow, system load, and stroke.

[0015] Furthermore, the optimization of the hydraulic schematic diagram in step (2) refers to designing a new oil circuit logic based on the hydraulic principles under the equal material manufacturing and subtractive manufacturing forming methods and the characteristics of additive manufacturing; the division of functions and selection of integration objects refers to dividing the system into power modules and functional modules according to the functions of each part and the actual usage scenarios, so as to determine the subsequent integration design objects; the parameter matching and selection refers to calculating the relevant parameters of the components according to the numerical values ​​of the working conditions described in step (1) based on the usage conditions, and selecting the corresponding hydraulic components, including motors, pumps, hydraulic cylinders, reversing valves, one-way valves, overflow valves and shuttle valves.

[0016] Specifically, the four major constraints of forming, processing, installation and performance are determined as follows:

[0017] (a) Forming constraints: Due to the forming characteristics of additive manufacturing and the influence of the forming angle, in order to avoid the overhanging structure, it is necessary to design the transition structure and support structure and select the appropriate forming direction and design the base surface;

[0018] (b) Processing constraints: The design result can be processed into various parts to be processed by existing processing methods;

[0019] (c) Installation constraints: The installation positions of components on the integrated assembly need to be arranged reasonably to avoid shape interference, and appropriate assembly distances should be reserved to facilitate the use of installation tools. The installation sequence of each component should be reasonably designed to ensure subsequent successful assembly;

[0020] (d) Performance constraints: The arrangement of component positions can only complete the preliminary integrated lightweight design. On this basis, the flow path is reasonably arranged to reduce the height of the integrated prototype.

[0021] Furthermore, the minimum envelope arrangement design of the spatial cavity plane mapping includes element envelope volume extraction and confirmation of the main element of the design space, plane mapping based on the cavity structure opening direction consistency criterion, and plane close arrangement based on the minimum assembly spacing; the element envelope volume extraction and confirmation of the main element of the design space refers to extracting the maximum envelope volume of the element and simplifying it into a cylinder or a cuboid for subsequent arrangement; the plane mapping based on the cavity structure opening direction consistency criterion means that additive manufacturing technology cannot achieve the forming of a closed structure in a completely suspended state, and one side opening must be retained as a covering surface. Such holes and hollow structures that need to retain openings are uniformly referred to as cavity structures, and the cavity opening direction is consistent with the additive manufacturing forming direction; the plane close arrangement based on the minimum assembly spacing means first determining the position of the main element with a larger volume, and then planning the remaining elements with smaller envelope volumes in sequence according to the connection logic of the hydraulic schematic diagram. During planning, installation constraints must be observed and the minimum installation spacing must be determined.

[0022] Furthermore, the fusion design of the components and the special-shaped oil tank means that the installation side end covers of the motor and the gear pump can be integrated into the connecting valve body for an integrated design, and the hydraulic oil tank is redesigned to be integrated into the valve body part, and the opening direction of the oil tank cover also complies with the consistency of the opening direction of the cavity structure; the local lightweight design means removing the originally redundant physical volume of each part, and only retaining the thickness and functional interface that meet the strength requirements; the sealing design means that the gear pump is integrated into the design as mentioned above, the gear pump sealing structure is redesigned to realize the sealing of the high and low pressure chambers and design the oil tank seal.

[0023] Furthermore, the design of the downstream low pressure loss flow channel includes a Z-direction adjustment element to determine the flow channel interface and a reasonable inclination angle, and a flow channel design based on the consistency criterion of the inclination direction of the overhang structure; the Z-direction adjustment element to determine the flow channel interface and the reasonable inclination angle means that during forming, as the number of printing layers increases, the forming effect of the sample will change, so it is necessary to select a larger forming angle to ensure the forming quality of the overhang structure; the flow channel design based on the consistency criterion of the inclination direction of the overhang structure means that when the above-mentioned reasonable inclination angle is met, the flow channel direction is consistent with the powder spreading direction of the printer scraper to ensure the forming quality, and the inclination direction of the overhang structure must be consistent with the powder spreading direction of the printer scraper to ensure the forming quality.

[0024] Furthermore, the statics and pressure loss simulation refers to using the static structure analysis module of ANSYS to perform strength analysis on the leveling hydraulic system shell, and when the maximum equivalent stress result does not meet the material strength, returning to the above steps (4)-(7) for correction and optimization until the requirements are met; using the Fluent module of ANSYS to perform pressure loss simulation on the leveling hydraulic system flow channel, and when the pressure loss result does not meet the design index, returning to the above steps (4)-(7) for correction and optimization until the requirements are met.

[0025] Furthermore, the prototype additive manufacturing and heat treatment refers to the parameter selection of additive manufacturing forming laser power, exposure time, dot pitch, scanning spacing, layer thickness and scanning strategy, and the parameter selection specifically includes: laser power 400W, exposure time 80μs, dot pitch 60μm, scanning spacing 110μm, layer thickness 50μm, and scanning strategy Stripe; at the same time, due to the difference in performance of metal materials in the printed state and the heat treated state, the integrated components need to be heat treated after manufacturing to prevent defects and stress concentration.

[0026] Furthermore, the prototype assembly and function and performance testing refers to assembling the above-mentioned integrated components with motors, valves and other components, and conducting pressure resistance and sealing tests, pressure loss test experiments of integrated prototype components, and bench installation test experiments of integrated prototypes as required.

[0027] By adopting the above scheme, the beneficial effects of the present invention are as follows:

[0028] The present invention applies additive manufacturing technology to the integrated design of multiple components of the leveling hydraulic system of the aerial work platform of the ladder fire truck, performs targeted lightweight processing and component fusion design, realizes a high degree of integration of the power and control parts of the leveling hydraulic system shell, and redesigns the cavity opening direction and the flow channel and overhang structure direction according to the molding characteristics of additive manufacturing, greatly reducing the weight and pressure loss of the integrated components, which is of great significance to the lightweight and integration of the hydraulic system of the aerial work platform of the ladder fire truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 It is a design method flow chart of a multi-component integrated design method for a leveling hydraulic system of an aerial work platform of a ladder fire truck provided by the present invention;

[0031] Figure 2It is an integrated component shell that is part of a multi-component integrated design method for a leveling hydraulic system of an aerial work platform of a ladder fire truck provided by the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] The following will be combined with the accompanying drawings of the present invention to provide a clear and complete description of the technical solution in the design method. Figure 1 The embodiment of the present invention provides a multi-component integrated design method for a leveling hydraulic system of an aerial work platform of a ladder fire truck, which specifically includes the following steps:

[0034] Step 1: Determine the operating conditions of the aerial work platform leveling hydraulic system of the ladder fire truck.

[0035] Specifically, the operating conditions include system rated and limit working pressure, system flow, system load, and stroke.

[0036] Step 2: Optimize the hydraulic schematic diagram, divide the functional modules and select the integration objects, parameter matching and selection.

[0037] Specifically, the optimization of hydraulic schematics refers to designing a new oil circuit logic based on the characteristics of additive manufacturing according to the hydraulic principles of traditional equal-material manufacturing and subtractive manufacturing; dividing functional modules and selecting integration objects refers to dividing the system into power modules, functional modules, etc. according to the functions of each part and the actual usage scenarios, to determine the subsequent integration design objects; parameter matching and selection refers to calculating the relevant parameters of the response elements according to the numerical values ​​of the usage conditions based on the usage conditions of the step one, and selecting the corresponding hydraulic components, including motors, pumps, hydraulic cylinders, reversing valves, one-way valves, overflow valves, shuttle valves, etc.

[0038] Step 3: Determine the constraints.

[0039] Specifically, the constraints mainly include four parts. The first is the forming constraint. When using additive manufacturing for integrated design, due to the influence of the forming angle, it is necessary to avoid the appearance of overhanging structures as much as possible and make the forming angle as large as possible. If it cannot be avoided, the transition structure and support structure need to be reasonably designed; due to the structural complexity of the integrated design, the forming direction will also lead to the appearance of cantilever structures, and it is necessary to select a suitable design base surface and forming direction; during forming, as the number of printing layers increases, the forming effect of the sample will change, so in the forming space, the flat design should be carried out as much as possible in the XY plane, and the size in the Z (height) direction should be compressed as much as possible to avoid excessive support, shorten the printing time, and be more conducive to the stable forming of the sample. The second is the processing constraint. After the integrated component is formed, further machining is required to meet the subsequent installation and use requirements. When designing, it is necessary to consider whether the design results can successfully process each part to be processed through the existing processing method, and reduce the difficulty of processing as much as possible to ensure the convenience of processing. During design, the surface to be processed should be kept on the same plane as much as possible, and the reference surface during processing should be reduced to reduce the processing error caused by multiple positioning; different degrees of processing allowance should be retained in different processing parts to prevent processing scrap caused by single processing errors. The third is installation constraints. Since the forming bin of the printing machine has a maximum forming size limit, the maximum design space of the integrated component has certain limitations; secondly, there are a variety of plug-ins and auxiliary components in the integrated component. The installation position of the component on the integrated component needs to be reasonably arranged to avoid external interference, and retain a suitable assembly distance for the use of installation tools. The installation sequence of each component should be reasonably designed to ensure subsequent successful assembly. The fourth is performance constraints. After determining the relative positions of each component, these components need to be connected through hydraulic channels. The arrangement of the component position can only complete the preliminary integrated lightweight design. On this basis, it is also necessary to improve the overall flow performance of the integrated component and the leveling hydraulic system and reduce pressure loss. Therefore, the reasonable arrangement of the flow path can further reduce the height of the integrated component, while further reducing the weight and improving the flow performance of the system; the wall thickness of the flow channel also needs to meet the constraints of strength performance to ensure safety requirements under the maximum working pressure.

[0040] Step 4: Design of the minimum envelope layout of the spatial cavity plane mapping.

[0041] Specifically, the minimum envelope arrangement design of the spatial cavity plane mapping mainly includes the extraction of component envelope volume and confirmation of the main components of the design space, plane mapping based on the consistency criterion of the cavity structure opening direction, and plane close arrangement based on the minimum assembly spacing. Among them, the extraction of component envelope volume and confirmation of the main components of the design space refers to extracting the maximum envelope volume of the component and simplifying it into a cylinder or a cuboid to facilitate subsequent arrangement; the plane mapping based on the consistency criterion of the cavity structure opening direction means that additive manufacturing technology cannot achieve the formation of a closed structure in a completely suspended state, and one side opening must be retained as a covering surface. The present invention uniformly refers to such holes and hollow structures that need to retain openings as cavity structures, and the cavity opening direction is consistent with the additive manufacturing forming direction; the plane close arrangement based on the minimum assembly spacing means first determining the position of the main component with a larger volume, and then planning the remaining components with smaller envelope volumes in sequence according to the connection logic of the hydraulic schematic diagram. During planning, the installation constraints must be strictly observed, and the minimum installation spacing must be determined. Figure 2 The first hydraulic cylinder interface, the first manual module connection port, the second manual module connection port, the one-way valve interface, the second hydraulic cylinder interface, and the manual part oil supply port are arranged on the same side of the shell, and the cavity opening directions are consistent; the first shuttle valve, the second shuttle valve, the solenoid reversing valve, the oil filling port, the overflow valve, and the pressure measuring joint are arranged on the same side of the shell, and the cavity opening directions are consistent.

[0042] Step five: Component and special-shaped oil tank integration design, local lightweight design, and sealing design.

[0043] Specifically, the fusion design of components and special-shaped oil tanks means that the installation side end caps of the motor and gear pump can be integrated into the connecting valve body for an integrated design. The two end caps of the motor and gear pump are removed, and the corresponding installation structure is processed on the original connecting valve block and directly installed on it. Since the gear pump has a simple structure and a small volume after lightweight treatment, the pump body can also be integrated into the original connecting valve block after removing the installation side end cap. There is still a relatively obvious space on one side of the gear pump that is not used. In order to improve the integration, the oil tank will be designed as a special-shaped oil tank, wrapping the unused space and extending it outward to the specified volume. The opening direction of the oil tank cover also complies with the consistency of the opening direction of the cavity structure in step 4. Local lightweight design refers to removing the redundant physical volume of each part, and only retaining the thickness and functional interface that meet the strength requirements. For example, the gear pump is mainly composed of the end caps on both sides, the pump body and the intermediate gear mechanism, and the end caps on both sides and the pump body are large in volume. In addition to the necessary installation and a certain safety wall thickness, the excess structural volume can be removed, and the lightweight treatment of the gear pump can be achieved through model reconstruction. Similarly, the remaining components and valve bodies all need to be designed in the same lightweight way. The sealing design refers to the principle of the seal when the gear pump is integrated into the design as mentioned above. The seal is to separate the low-pressure area of ​​the inlet and the high-pressure area of ​​the outlet of the gear pump to prevent pressure leakage. The function of the outer ring seal is to prevent the leakage of hydraulic oil in the internal mechanism of the gear pump. It is redesigned according to the cross-sectional size and sealing principle of the original seal. The oil tank is optimized and the shape of the seal is a regular pattern. Although it cannot be sealed by the traditional circular cross-section seal, it can also be sealed by designing a custom rectangular cross-section seal strip.

[0044] Step six: Design method of downstream low pressure loss flow channel.

[0045] Specifically, the downstream low-pressure loss flow channel design method mainly includes the Z-direction adjustment element to determine the flow channel interface and reasonable inclination angle, and the flow channel design based on the consistency criterion of the inclination direction of the overhanging structure. The Z-direction adjustment element determines the flow channel interface and reasonable inclination angle. It means that during forming, as the number of printing layers increases, the forming effect of the sample will change. At the same time, the forming quality of the overhanging structure is poor, so a larger forming angle needs to be selected; the flow channel design based on the consistency criterion of the inclination direction of the overhanging structure means that when the above-mentioned reasonable inclination angle is met, the flow channel direction is consistent with the powder spreading direction of the printer scraper. There is a better forming quality, so the inclination direction of the overhanging structure should be kept consistent with the powder spreading direction of the printer scraper as much as possible.

[0046] Step 7: Statics and pressure loss simulation.

[0047] Specifically, statics and pressure loss simulation refers to using the static structural analysis (StaticStructural) module of ANSYS to perform strength analysis on the leveling hydraulic system shell. When the maximum equivalent stress result does not meet the material strength, return to the above steps (4)-(7) for correction and optimization until the requirements are met; use the Fluent module of ANSYS to perform pressure loss simulation on the flow channel of the leveling hydraulic system. When the pressure loss result does not meet the design index, return to the above steps (4)-(7) for correction and optimization until the requirements are met.

[0048] Step 8: Prototype additive manufacturing and post-processing.

[0049] Specifically, prototype additive manufacturing and post-processing refers to the selection of parameters such as additive manufacturing laser power, exposure time, dot pitch, scanning spacing, layer thickness, scanning strategy, etc. The parameters of the present invention are laser power 400W, exposure time 80μs, dot pitch 60μm, scanning spacing 110μm, layer thickness 50μm, and scanning strategy Stripe; at the same time, the performance of metal materials in the printed state and the heat-treated state is different. Although the printed state has high strength, the overall performance is poor, and it is easy to produce defects and stress concentration. Therefore, the integrated components need to be heat treated after manufacturing to improve the overall performance.

[0050] Step nine: Prototype assembly and function and performance testing.

[0051] Specifically, prototype assembly and function and performance testing refers to assembling the above-mentioned integrated components with motors, valves and other components, and conducting pressure resistance and sealing tests, pressure loss test experiments of integrated prototype components, and bench installation test experiments of integrated prototypes as required.

[0052] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0053] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A design method for a leveling hydraulic system for an aerial work platform of a ladder fire truck, characterized in that: The method comprises the following steps: (1) Determine the operating conditions of the hydraulic system for leveling the aerial work platform of the ladder fire truck; (2) Optimizing the hydraulic principle diagram, dividing the system into functions and selecting integration objects, and matching and selecting parameters of hydraulic components according to the operating conditions of step (1); (3) Determine the four major constraints of forming, processing, installation and performance; (4) Minimum envelope layout design of spatial cavity plane mapping; (5) Fusion design of components and special-shaped oil tanks, as well as local lightweight design and sealing design; (6) Design downstream low pressure loss flow channels; (7) Statics optimization and simulation of flow channel pressure loss in leveling hydraulic system; (8) Additive manufacturing and heat treatment of prototypes; (9) Prototype assembly and function and performance testing.

2. The design method according to claim 1, characterized in that: The operating conditions of the leveling hydraulic system of the aerial work platform of the ladder fire truck are determined including the system rated and limit working pressures, system flow, system load, and stroke.

3. The design method according to claim 1, characterized in that: The optimization of the hydraulic schematic diagram in step (2) refers to designing a new oil circuit logic based on the hydraulic principles under the equal material manufacturing and subtractive manufacturing forming methods and the characteristics of additive manufacturing; the division of functions and selection of integration objects refers to dividing the system into power modules and functional modules according to the functions of each part and the actual usage scenarios, so as to determine the subsequent integration design objects; the parameter matching and selection refers to calculating the relevant parameters of the components according to the numerical values ​​of the working conditions described in step (1) based on the usage conditions, and selecting the corresponding hydraulic components, including motors, pumps, hydraulic cylinders, reversing valves, one-way valves, overflow valves and shuttle valves.

4. The design method according to claim 1, characterized in that: The four major constraints of forming, processing, installation and performance are as follows: (a) Forming constraints: Due to the forming characteristics of additive manufacturing and the influence of the forming angle, in order to avoid the overhanging structure, it is necessary to design the transition structure and support structure and select the appropriate forming direction and design the base surface; (b) Processing constraints: The design result can be processed into various parts to be processed by existing processing methods; (c) Installation constraints: The installation positions of components on the integrated assembly need to be arranged reasonably to avoid shape interference, and appropriate assembly distances should be reserved to facilitate the use of installation tools. The installation sequence of each component should be reasonably designed to ensure subsequent successful assembly; (d) Performance constraints: The arrangement of component positions can only complete the preliminary integrated lightweight design. On this basis, the flow path is reasonably arranged to reduce the height of the integrated prototype.

5. The design method according to claim 1, characterized in that: The minimum envelope arrangement design of the spatial cavity plane mapping includes element envelope volume extraction and confirmation of the main element of the design space, plane mapping based on the consistency criterion of the cavity structure opening direction, and plane close arrangement based on the minimum assembly spacing; the element envelope volume extraction and confirmation of the main element of the design space refers to extracting the maximum envelope volume of the element and simplifying it into a cylinder or a cuboid for subsequent arrangement; the plane mapping based on the consistency criterion of the cavity structure opening direction means that the additive manufacturing technology cannot achieve the forming of a closed structure in a completely suspended state, and one side opening must be retained as a covering surface. Such holes and hollow structures that need to retain openings are uniformly referred to as cavity structures, and the cavity opening direction is consistent with the additive manufacturing forming direction; the plane close arrangement based on the minimum assembly spacing means first determining the position of the main element with a larger volume, and then planning the remaining elements with smaller envelope volumes in sequence according to the connection logic of the hydraulic schematic diagram. During planning, installation constraints must be observed and the minimum installation spacing must be determined.

6. The design method according to claim 1, characterized in that: The fusion design of the components and the special-shaped oil tank means that the end cover on the installation side of the motor and the gear pump can be integrated into the connecting valve body for an integrated design, and the hydraulic oil tank is redesigned to be integrated into the valve body part, and the opening direction of the oil tank cover also complies with the consistency of the opening direction of the cavity structure; The local lightweight design refers to removing the originally redundant physical volume of each part, and only retaining the thickness and functional interface that meet the strength requirements; the sealing design refers to the above-mentioned fusion design of the gear pump, redesigning the gear pump sealing structure to achieve high and low pressure chamber sealing and designing the oil tank seal.

7. The design method according to claim 1, characterized in that: The designed downstream low-pressure loss flow channel includes a Z-direction adjustment element to determine the flow channel interface and a reasonable inclination angle, and a flow channel design based on the consistency criterion of the inclination direction of the overhang structure; the Z-direction adjustment element to determine the flow channel interface and the reasonable inclination angle means that during forming, as the number of printing layers increases, the forming effect of the sample will change, so it is necessary to select a larger forming angle to ensure the forming quality of the overhang structure; the flow channel design based on the consistency criterion of the inclination direction of the overhang structure means that when the above-mentioned reasonable inclination angle is met, the flow channel direction is consistent with the powder spreading direction of the printer scraper to ensure the forming quality, and the inclination direction of the overhang structure must be consistent with the powder spreading direction of the printer scraper to ensure the forming quality.

8. The design method according to claim 1, characterized in that: The statics and pressure loss simulation refers to using the static structure analysis module of ANSYS to perform strength analysis on the shell of the leveling hydraulic system. When the maximum equivalent stress result does not meet the material strength requirement, return to the above steps (4)-(7) for correction and optimization until the requirements are met; and use the Fluent module of ANSYS to perform pressure loss simulation on the flow channel of the leveling hydraulic system. When the pressure loss result does not meet the design index, return to the above steps (4)-(7) for correction and optimization until the requirements are met.

9. The design method according to claim 1, characterized in that: The prototype additive manufacturing and heat treatment refers to the parameter selection of additive manufacturing forming laser power, exposure time, dot pitch, scanning spacing, layer thickness and scanning strategy, and the parameter selection specifically includes: laser power 400W, exposure time 80μs, dot pitch 60μm, scanning spacing 110μm, layer thickness 50μm, and scanning strategy Stripe; at the same time, due to the difference in performance of metal materials in the printed state and the heat treated state, the integrated components need to be heat treated after manufacturing to prevent defects and stress concentration.

10. The design method according to claim 1, characterized in that: The prototype assembly and function and performance testing refers to assembling the above-mentioned integrated components with motors, valves and other components, and conducting pressure resistance and sealing tests, pressure loss test experiments of integrated prototype components, and bench installation test experiments of integrated prototypes as required.

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