A weft-knitting double-sided large circular machine big drum based on CAE simulation and optimization method

Abstract

A weft-knitted double-sided large circular machine big kettle based on CAE simulation and an optimization method, the big kettle comprises a big kettle body in a ring structure, a support body is nested in the big kettle body, a barrel mounting cylinder is arranged at the center position of the support body, the barrel mounting cylinder and the support body are connected through the first support strip group and the second support strip group arranged at intervals, at least a part of the side edge of the first support strip group is connected with the second support strip group, the optimization method comprises a parameterized three-dimensional model established according to design requirements, CAE simulation analysis is carried out on the model, stress concentration areas and thermal deformation sensitive areas are identified according to the simulation analysis results, the layout of the first support strip group and the second support strip group is adjusted, and the optimal model is found through continuous iteration optimization, the complete closed loop of parameterized modeling, simulation evaluation, diagnosis adjustment, iteration optimization and manufacturing output is adopted to reduce stress concentration and improve the rigidity and strength of the overall structure.

Description

Technical Field

[0001] This invention relates to a large cauldron structure for a double-sided circular knitting weft knitting machine based on CAE simulation and its optimization method, belonging to the field of textile machinery. Specifically, it is a large cauldron structure for a double-sided circular knitting weft knitting machine optimized through computer-aided engineering (CAE) simulation technology. Background Technology

[0002] In the textile industry, the double-sided circular knitting machine plays a crucial role. Its large cauldron structure, as a core supporting component, has a vital impact on the equipment's operational stability and production efficiency.

[0003] However, traditional methods for designing large cauldron structures have many limitations. For a long time, designers have relied heavily on empirical formulas and simplified models to design large cauldron structures. While these formulas and models can provide design references to some extent, they cannot fully and accurately consider the complex stress and heat conditions faced by the cauldron structure during actual operation.

[0004] Therefore, in actual operation, the large cauldron structure is prone to problems such as stress concentration and uneven deformation. These problems not only reduce the operational stability and production efficiency of the equipment, but also shorten the service life of the equipment, thereby affecting the quality of the final product and causing unnecessary economic losses to textile enterprises. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a CAE-based simulation-based double-sided circular knitting machine and its optimization method, in order to solve the technical problems of uneven stress and thermal deformation leading to decreased knitting accuracy in traditional structures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an optimization method for a double-sided circular knitting machine cauldron based on CAE simulation, wherein the double-sided circular knitting machine cauldron comprises a cauldron body with a ring structure, and a support body and a gun barrel mounting cylinder are nested inside the cauldron body. The gun barrel mounting cylinder is connected to the support body through a first support strip group and a second support strip group arranged at intervals. The method includes the following steps:

[0007] S1. Model building steps: Based on the initial design requirements, a parametric 3D model of the tripod structure is built on the basis of the traditional tripod.

[0008] S2, CAE simulation analysis steps: Apply preset mechanical loads and thermal boundary conditions to the input cauldron structure, and perform CAE simulation analysis to obtain the first data;

[0009] S3. Model parameter adjustment steps: Compare the first data with the preset design indicators, identify the stress concentration area and the thermal deformation sensitive area, and adjust the parameters of the cauldron structure accordingly to generate the adjusted and updated cauldron model.

[0010] S4. Manufacturing document generation step: Take the updated cauldron model obtained in step S3 as the new input, and repeatedly execute steps S2 and S3 to form a closed-loop feedback optimization process until all the first data meets the preset design indicators; based on the model parameters of the final iterative optimization, generate manufacturing drawings and data.

[0011] Furthermore, the CAE simulation analysis step includes static structural analysis, thermodynamic coupling analysis, and modal analysis.

[0012] Furthermore, the first data includes stress cloud maps and deformation cloud maps obtained from static structural analysis, temperature distribution cloud maps and thermal deformation cloud maps obtained from thermodynamic coupling analysis, and natural frequencies and mode shapes obtained from modal analysis.

[0013] Furthermore, in the model parameter adjustment step, the adjustment of the parameters of the cauldron structure is based on the CAE simulation analysis results. The parameters of the cauldron structure include the layout, width, thickness, tilt angle and shape of the first support strip group and the second support strip group.

[0014] Furthermore, in the model parameter adjustment step, the parameters of the large tripod structure are adjusted according to the recognition results. The specific adjustment process is as follows:

[0015] If a stress concentration area is identified, the width and / or thickness of the first support strip group and / or the second support strip group near the area are increased, and / or their through-hole shape is optimized to smooth the stress transition, and / or their tilt angle is adjusted to optimize the force flow path.

[0016] If a thermal deformation sensitive area is identified, the layout or thickness distribution of the support strips near that area is adjusted to change the local thermal stiffness and guide the thermal deformation to be released in a direction that has less impact on accuracy.

[0017] A double-sided circular knitting machine cauldron based on CAE simulation is manufactured based on the latest optimized parameters generated from the manufacturing drawings and data. The cauldron body and the support body are provided with an annular groove. The gun barrel mounting cylinder is located at the center of the support body, and at least a part of the side of the first support strip group located between the two is connected to the second support strip group to jointly improve the stress distribution and thermal deformation characteristics of the cauldron structure.

[0018] Furthermore, the outer edge of the cauldron body is provided with several spindle seats for mounting the main shaft and mounting seats for overall fixation, and the spindle seats and mounting seats are evenly distributed along the axial center line of the gun barrel mounting cylinder.

[0019] Furthermore, the first support strip group is a closed ring structure, and a first through hole in the middle is provided in the shape of a teardrop, with the tip of the first through hole converging towards the gun barrel mounting cylinder; the second support strip group is a horseshoe-shaped structure, and a second through hole is provided in the middle, with the opening of the second through hole facing the annular groove.

[0020] Furthermore, both the first support bar group and the second support bar group are set at an inclined angle relative to the radial center line of the gun barrel mounting cylinder, and the inclination angle of the first support bar group is the same as or different from that of the second support bar group.

[0021] Furthermore, the width and thickness of the first support strip group are both greater than those of the second support strip group, the top height of the side of the first support strip group is flush with or connected to the top of the side of the support body, and the top height of the second support strip group is lower than the top of the side of the support body.

[0022] The beneficial effects of this invention are:

[0023] The product structure of this application utilizes innovative CAE simulation-driven design to optimize the asymmetrical support layout and connection relationship between the first and second support strip groups. This design makes the load transfer path more scientific and rational. The thick first support strip group, as the main load-bearing structure, provides extremely high rigidity and strength; while the thinner second support strip group effectively assists in support and disperses stress. This synergistic effect greatly improves the stress distribution of the overall structure, eliminates stress concentration phenomena in traditional designs, thereby significantly improving the fatigue life and load-bearing capacity of the cauldron and reducing the risk of downtime due to structural failure.

[0024] The optimization method in this application is based on CAE simulation technology. It uses simulation results as a guide to iteratively optimize key design variables (such as support bar angle, shape, and connection relationship). Through a complete closed loop of "parametric modeling → simulation evaluation → diagnosis and adjustment → iterative optimization → manufacturing output", it accurately identifies stress concentration points, thermal deformation trends, and resonance risks that cannot be predicted by traditional experience design. By trial and error and optimization in a virtual environment, it quickly finds the optimal structural parameters, reduces the number of times physical prototypes are made and tested in the later stage, effectively shortens the product development cycle, and reduces development costs and market risks. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram illustrating the steps of an optimization method for a double-sided circular knitting machine based on CAE simulation, according to the present invention.

[0027] Figure 2 This is a flowchart illustrating the optimization method for a double-sided circular knitting machine based on CAE simulation according to the present invention.

[0028] Figure 3 This is a schematic diagram of the overall structure of a large tripod for a double-sided circular knitting machine based on CAE simulation according to the present invention.

[0029] Figure 4 This is a side view of the structure of a large cauldron made of double-sided circular knitting machine based on CAE simulation according to the present invention.

[0030] The reference numerals in the attached figures are as follows:

[0031] 1. The main body of the tripod; 11. The main shaft seat; 12. The mounting base; 13. The annular groove;

[0032] 2. Support body; 21. Gun barrel mounting cylinder; 22. First support bar group; 221. First through hole; 23. Second support bar group; 231. Second through hole. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments. Specific implementation method one:

[0035] like Figure 1 , Figure 2 As shown, an optimization method for a double-sided circular knitting machine cauldron based on CAE simulation is disclosed. The cauldron includes a cauldron body 1 with a ring structure. A support body 2 and a gun barrel mounting cylinder 21 are nested inside the cauldron body 1. The gun barrel mounting cylinder 21 is connected to the support body 2 by a first support strip group 22 and a second support strip group 23 arranged at intervals. The method includes the following steps:

[0036] S1. Model Establishment Steps: Based on the initial design requirements, a parametric three-dimensional model is established on the basis of the traditional ding (a type of ancient Chinese cooking vessel). The model includes the ding body 1, the support body 2, the annular groove 13, the gun barrel mounting cylinder 21, and the first support bar group 22 and the second support bar group 23. Simulation is carried out by adjusting key design parameters.

[0037] Among them, the number, layout angle, width, thickness, through hole shape, and connection relationship between the first and second support strip groups are all key design parameters that can be driven independently. Any design changes can be quickly achieved by modifying the values ​​of key design parameters, which greatly improves optimization efficiency.

[0038] S2, CAE simulation analysis steps: Apply preset mechanical loads and thermal boundary conditions (including spindle load, installation constraints, temperature, etc.) to the input cauldron structure, and perform CAE simulation analysis to obtain the first data for a comprehensive evaluation of its performance;

[0039] CAE simulation analysis includes: static structural analysis, thermodynamic coupling analysis, and modal analysis;

[0040] 1. Static structural analysis: used to obtain stress cloud diagrams and deformation cloud diagrams of the cauldron under ultimate working load, identify the maximum stress point and its value, and determine whether there is a risk of stress concentration.

[0041] 2. Thermodynamic coupling analysis: This simulates the heat generation and heat dissipation during equipment operation, and combines the structural coupling analysis of the parametric 3D model to calculate the temperature distribution cloud map under steady state and the thermal deformation cloud map of the cauldron structure in the parametric 3D model, in order to evaluate the impact of thermal expansion on structural accuracy;

[0042] 3. Modal analysis: used to calculate the natural frequencies and mode shapes of a parametric 3D model of a structure, predict its dynamic characteristics, ensure that the operating speed is far away from the natural frequencies of the structure, and avoid resonance between different devices.

[0043] S3. Identification and Adjustment: The first data is compared with the preset design indicators to make a comprehensive diagnosis and optimization decision. The stress concentration area and the thermal deformation sensitive area are identified. Based on this, the layout, shape, size, connection relationship and tilt angle of the first support strip group 22 and the second support strip group 23 in the support body 2 are adjusted to generate the adjusted and updated cauldron model.

[0044] 1. For stress concentration: If excessive local stress is found, the geometry of the area should be optimized first. For example, the width or thickness of the first support strip group 22 can be increased to strengthen the main load-bearing path; the teardrop shape of the first through hole 221 can be optimized to make the transition smoother; or the tilt angle of the first and second support strip groups can be adjusted to change the direction of force flow and make the stress distribution more uniform.

[0045] 2. For excessive thermal deformation: If the thermal deformation exceeds the tolerance, the thermal rigidity of the structure can be changed by adjusting the layout and thickness distribution of the support strips, and the thermal deformation can be guided to be released in a direction with less impact on accuracy (such as the annular groove 13).

[0046] 3. Regarding the risk of resonance: If modal analysis finds that the natural frequency coincides with the excitation frequency, the natural frequency of the structure can be shifted by changing the mass and stiffness distribution of the support strip group (such as adjusting the U-shaped opening size of the second support strip group 23).

[0047] S4. Report Generation: Using the updated cauldron model obtained in step S3 as new input, iteratively execute steps S2 and S3 to form a closed-loop feedback optimization process until all the first data meets the preset design indicators; based on the model parameters of the final iterative optimization, generate manufacturing drawings and data.

[0048] The iterative execution steps S2 and S3 refer to substituting the parameterized 3D model of the cauldron structure adjusted in step S3 back into step S2 for a new round of CAE simulation analysis, comparing the new results with the previous round and the preset design goals, and sequentially executing the iterative process of S2→S3→S2 until all performance indicators meet the design requirements, at which point the final design scheme with the best performance is obtained.

[0049] After locking in the optimal parametric 3D model parameters after the final iteration, manufacturing files are generated, including finalized 3D engineering drawings and 2D manufacturing drawings, and CAM data that can be used for CNC machining is directly output, ensuring that the optimized design can be accurately transformed into a high-performance product.

[0050] The optimization method in this application is based on CAE simulation technology. It uses simulation results as a guide to iteratively optimize key design variables (such as support bar angle, shape, and connection relationship). Through a complete closed loop of "parametric modeling → simulation evaluation → diagnosis and adjustment → iterative optimization → manufacturing output", it accurately identifies stress concentration points, thermal deformation trends, and resonance risks that cannot be predicted by traditional experience design. By trial and error and optimization in a virtual environment, it quickly finds the optimal structural parameters, reduces the number of times physical prototypes are made and tested in the later stage, effectively shortens the product development cycle, and reduces development costs and market risks. Specific Implementation Method Two:

[0052] like Figure 3 , Figure 4 As shown, the present invention provides a technical solution for a double-sided circular knitting machine based on CAE simulation: it includes a large cauldron body 1 with a ring structure, and the outer edge of the large cauldron body 1 is provided with a plurality of spindle seats 11 for mounting the spindle and mounting seats 12 for overall fixation. The spindle seats 11 and mounting seats 12 are evenly distributed along the axial center line of the gun barrel mounting cylinder 21.

[0053] The main body 1 of the cauldron is internally fitted with a support body 2. An annular groove 13 is provided between the support body 2 and the main body 1 of the cauldron. A gun barrel mounting cylinder 21 is provided at the center of the support body 2. The gun barrel mounting cylinder 21 is connected to the support body 2 by a first support bar group 22 and a second support bar group 23 that are arranged at intervals. At least a part of the middle side of the first support bar group 22 is connected to the second support bar group 23, so as to jointly improve the stress distribution and thermal deformation characteristics of the cauldron structure.

[0054] The first support strip group 22 is a closed ring structure, and a first through hole 221 in the middle is provided in the shape of a teardrop. The tip of the first through hole 221 converges towards the barrel mounting cylinder 21.

[0055] The closed-loop structure forms a complete and strong support frame with a complete mechanical transmission path and significant rigidity. Furthermore, its teardrop-shaped first through hole 221 is a special shape optimized based on CAE fluid dynamics and stress cloud diagram simulation. This shape can guide and diffuse the radial force and torsion from the gun barrel mounting cylinder 21 to the entire strip group and even the support body 2 in the smoothest way, effectively avoiding the stress concentration phenomenon that is easy to occur at the sharp corners of traditional circular or square openings, thus improving fatigue strength and service life.

[0056] The second support bar group 23 has a horseshoe-shaped structure, and a second through hole 231 is provided in the middle, with the opening of the second through hole 231 facing the annular groove 13.

[0057] The open horseshoe-shaped design provides the structure with greater flexibility and deformation space while maintaining a certain level of support rigidity. The design of its opening facing the annular groove 13 allows the structure to produce a small amount of elastic deformation when subjected to load, thus playing a greater role in absorbing vibration energy and compensating for local thermal expansion deformation, rather than simply serving as the main load-bearing structure.

[0058] In order to achieve the functional zoning design, the width and thickness of the first support strip group 22 are both greater than those of the second support strip group 23.

[0059] Among them, the thick first support strip group 22 serves as the main support frame, responsible for bearing and transmitting most of the main load during equipment operation, providing macroscopic stiffness and strength for the entire cauldron, while the relatively thin and narrow second support strip group 23 serves as an auxiliary frame, used to improve local stress distribution, suppress vibration and fine-tune thermal deformation.

[0060] To better transfer stress, the first support bar group 22 and the second support bar group 23 are both set at an inclined angle relative to the radial center line of the barrel mounting cylinder 21.

[0061] The tilt angle is the result of CAE multi-condition simulation optimization, and is not a simple radial arrangement. This design enables the force flow direction of the support bar group to better match the actual principal stress transmission path when facing the actual complex load from the main shaft, thereby greatly reducing unnecessary bending stress, making the force flow transmission smoother and more efficient, and making the overall stress distribution more uniform.

[0062] To accommodate different functions, the tilt angle of the first support bar group 22 may be the same as or different from that of the second support bar group 23, indicating that the angle parameters of the two can be independently optimized according to their different roles in the overall structure.

[0063] For example, the first support strip group 22, which bears the main load, can be set to the optimal force flow transmission angle, while the second support strip group 23, which plays an auxiliary role, can be set to the optimal vibration suppression or thermal deformation compensation angle. This design freedom allows CAE optimization to finely tune the overall performance of the structure, thereby achieving the optimal solution for overall performance.

[0064] To optimize material utilization, the top height of the side of the first support strip group 22 is flush with or connected to the top of the side of the support body 2, while the top height of the second support strip group 23 is lower than the top of the side of the support body 2.

[0065] This stepped height difference allows the support 2 to better guide the force flow, reduce unnecessary stress concentration, and may also facilitate demolding or cooling during casting.

[0066] In summary, the product structure of this application utilizes innovative CAE simulation-driven design to optimize the asymmetrical support layout and the connection relationship between the first support strip group 22 and the second support strip group 23. This design makes the load transfer path more scientific and rational. The thick first support strip group 22, as the main load-bearing structure, provides extremely high rigidity and strength; while the thinner second support strip group 23 effectively assists in support and disperses stress. This synergistic effect greatly improves the stress distribution of the overall structure, eliminates stress concentration phenomena in traditional designs, thereby significantly improving the fatigue life and load-bearing capacity of the cauldron and reducing the risk of downtime due to structural failure.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An optimization method for a large drum of a weft-knitted double-sided large circular machine based on CAE simulation, wherein the large drum of the weft-knitted double-sided large circular machine comprises a large drum body (1) in a ring structure, a support body (2) and a barrel mounting cylinder (21) are nested inside the large drum body (1), the barrel mounting cylinder (21) and the support body (2) are connected through a first support strip group (22) and a second support strip group (23) arranged at intervals, and the method is characterized in that: It comprises the following steps: S1, model building step: based on the initial design requirements, on the basis of traditional big Ding, the establishment of parameterized three-dimensional model of big Ding structure; S2, CAE simulation analysis step: the input of the big Ding structure is applied to the preset mechanical load and thermal boundary conditions, and CAE simulation analysis is carried out to obtain the first data; S3, model parameter adjustment step: the first data is compared with the preset design index, the stress concentration area and the thermal deformation sensitive area are identified, and the parameters of the big Ding structure are adjusted to generate the updated big Ding model after adjustment; S4, manufacturing file generation step: the updated big Ding model obtained in step S3 is taken as new input, steps S2 and S3 are executed in a loop to form a closed loop feedback optimization process until the first data meets the preset design index; based on the final iteration optimized model parameters, manufacturing drawings and data are generated; Wherein, the first support bar group (22) is optimized to a closed loop structure and a first through hole (221) in the shape of a water droplet is arranged in the middle of the first support bar group (22), the tip of the first through hole (221) is gathered towards the direction of the barrel mounting cylinder (21); the second support bar group (23) is optimized to a horseshoe-shaped structure and a second through hole (231) is arranged in the middle of the second support bar group (23), the opening of the second through hole (231) is directed towards the annular groove (13) between the big Ding body (1) and the support body (2).

2. The optimization method for the large heddle of the double circular weft knitting machine based on CAE simulation according to claim 1, characterized in that: In the CAE simulation analysis step, the CAE simulation analysis includes statics structure analysis, thermal mechanics coupling analysis and modal analysis.

3. The method for optimizing the large heddle of the double circular weft knitting machine based on CAE simulation according to claim 2, characterized in that: The first data includes stress nephogram and deformation nephogram obtained by statics structure analysis, temperature distribution nephogram and thermal deformation nephogram obtained by thermal mechanics coupling analysis, and natural frequency and mode shape obtained by modal analysis.

4. The method for optimizing the big harness of the double face large circular weft knitting machine based on CAE simulation according to claim 1, characterized in that: In the model parameter adjustment step, the adjustment of the parameters of the big Ding structure is based on the CAE simulation analysis results, and the parameters of the big Ding structure include the layout, width, thickness, inclination angle and shape of the first support bar group (22) and the second support bar group (23).

5. The method for optimizing the big harness of the double face large circular weft knitting machine based on CAE simulation according to claim 1, characterized in that: In the model parameter adjustment step, the parameters of the big Ding structure are adjusted according to the identification results, and the specific adjustment process is as follows: If the stress concentration area is identified, the width and / or thickness of the first support bar group (22) and / or the second support bar group (23) near the area is increased, and / or the through hole shape is optimized to smooth the stress transition, and / or the inclination angle is adjusted to optimize the force flow path; If the thermal deformation sensitive area is identified, the layout or thickness distribution of the support bar group near the area is adjusted to change the local thermal stiffness and guide the thermal deformation to release in the direction with less impact on precision.

6. A weft knitted double circular machine drum made by the method of optimization of a weft knitted double circular machine drum according to any one of claims 1 to 5, based on the latest optimized parameters generated by the manufacturing drawings and data, characterized in that: The annular groove (13) is further arranged between the big Ding body (1) and the support body (2), the barrel mounting cylinder (21) is arranged at the center position of the support body (2), and at least a part of the side edge of the first support bar group (22) between the two is connected with the second support bar group (23) to improve the stress distribution and thermal deformation characteristics of the big Ding structure. The first support strip group (22) is a closed ring structure, and a first through hole (221) in a water-drop shape is arranged in the middle part of the first support strip group (22), and the tip of the first through hole (221) is folded towards the direction of the barrel mounting cylinder (21); the second support strip group (23) is a horseshoe structure, and a second through hole (231) is arranged in the middle part of the second support strip group (23), and the opening of the second through hole (231) is directed towards the annular groove (13).

7. A large creel for a weft knitting double circular machine according to claim 6, characterized in that: The outer edge of the large cauldron body (1) is provided with a plurality of main shaft seats (11) for mounting the main shaft and a mounting seat (12) for overall fixation, and the main shaft seats (11) and the mounting seat (12) are uniformly distributed along the axial center line of the barrel mounting cylinder (21).

8. A large creel for a weft knitting double circular machine according to claim 6, characterized in that: The first support strip group (22) and the second support strip group (23) are arranged at an inclined angle relative to the radial center line of the barrel mounting cylinder (21), and the inclined angle of the first support strip group (22) is the same as or different from the inclined angle of the second support strip group (23).

9. A large creel for a weft knitting double circular machine according to claim 6, characterized in that: The width and thickness of the first support strip group (22) are greater than those of the second support strip group (23), the top height of the side edge of the first support strip group (22) is flush with or connected to the top of the side edge of the support body (2), and the top height of the second support strip group (23) is lower than the top of the side edge of the support body (2).

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