CAE simulation-based large tripod of weft knitting double-sided circular knitting machine and optimization method

Abstract

According to the CAE simulation-based large tripod of the weft knitting double-face circular knitting machine and the optimization method, the large tripod comprises a large tripod body of an annular structure, a supporting body is embedded in the large tripod body, a gun barrel mounting barrel is arranged at the center position of the supporting body, and the gun barrel mounting barrel and the supporting body are connected through a first supporting strip set and a second supporting strip set which are arranged at intervals; the optimization method comprises the steps that a parameterized three-dimensional model is established according to the design requirement, CAE simulation analysis is conducted on the parameterized three-dimensional model, a stress concentration area and a thermal deformation sensitive area are identified according to the simulation analysis result, and the stress concentration area and the thermal deformation sensitive area are identified according to the CAE simulation analysis result. According to the method, through parametric modeling, simulation evaluation, diagnosis adjustment, iterative optimization and manufacturing of a complete closed loop of output, stress concentration is reduced, and the rigidity and strength of the overall structure are improved.

Description

TECHNICAL FIELD

[0001] The application is a weft-knitting double-sided large circular machine large drum based on CAE simulation and an optimization method, belonging to the field of textile machinery, specifically a weft-knitting double-sided large circular machine large drum structure optimized through computer-aided engineering (CAE) simulation technology. BACKGROUND

[0002] In the textile industry, the weft-knitting double-sided large circular machine plays a crucial role, and its large drum structure as the core support component has a crucial impact on the running stability and production efficiency of the equipment.

[0003] However, the traditional large drum structure design method has many limitations. For a long time, designers have relied on empirical formulas and simplified models to design the large drum structure. Although these empirical formulas and simplified models can provide design references to some extent, they are difficult to comprehensively and accurately consider the complex stress and heat conditions that the large drum structure faces in actual operation.

[0004] Therefore, in actual operation, the large drum structure is prone to stress concentration, uneven deformation, and other problems, which not only reduce the running 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

[0005] In view of the deficiencies of the prior art, the application aims to provide a weft-knitting double-sided large circular machine large drum based on CAE simulation and an optimization method to solve the technical problem of declining knitting precision caused by uneven stress and thermal deformation of the traditional structure.

[0006] To achieve the above-mentioned purpose, the application is implemented through the following technical solution: an optimization method for a weft-knitting double-sided large circular machine large drum based on CAE simulation, the weft-knitting double-sided large circular machine large drum comprising a large drum body in a ring structure, a support body and a barrel mounting cylinder being nested inside the large drum body, the barrel mounting cylinder and the support body being connected through first and second support bar groups arranged at intervals, comprising the following steps: S1, model establishment step: based on initial design requirements, a parameterized three-dimensional model of the large drum structure is established on the basis of the traditional large drum; S2, CAE simulation analysis step: a predetermined mechanical load and thermal boundary condition are applied to the input large drum structure, and CAE simulation analysis is performed to obtain first data; S3, model parameter adjustment step: the first data is compared with the predetermined design index, the stress concentration area and the thermal deformation sensitive area are identified, and the parameters of the large drum structure are adjusted to generate an updated large drum model after adjustment; S4, manufacturing file generating step: taking the updated large-ding model obtained in step S3 as new input, cyclically executing steps S2 and S3 to form a closed-loop feedback optimization process until the first data all meet the preset design index; and generating manufacturing drawings and data based on the model parameters after final iterative optimization.

[0007] Further, in the CAE simulation analysis step, the CAE simulation analysis includes static structural analysis, thermal-mechanical coupling analysis, and modal analysis.

[0008] Further, the first data includes stress nephogram and deformation nephogram obtained by static structural analysis, temperature distribution nephogram and thermal deformation nephogram obtained by thermal-mechanical coupling analysis, and natural frequency and mode shape obtained by modal analysis.

[0009] Further, in the model parameter adjustment step, the adjustment of the parameters of the large-ding structure is based on the CAE simulation analysis results, and the parameters of the large-ding structure include the layout, width, thickness, inclination angle, and shape of the first support bar group and the second support bar group.

[0010] Further, in the model parameter adjustment step, the parameters of the large-ding structure are adjusted according to the identification results, and the specific adjustment process is as follows: If a stress concentration area is identified, the width and / or thickness of the first support bar group and / or the second support bar group 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 a 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 a direction that has less impact on precision.

[0011] A weft-knitting double-sided large-ding of a large-circular machine based on CAE simulation, which is manufactured based on manufacturing drawings and data generated based on the latest optimized parameters, wherein an annular groove is further arranged between the large-ding body and the support body, the barrel is arranged at the center position of the support body, and at least a part of the side edge of the first support bar group between the barrel and the support body is connected with the second support bar group to jointly improve the stress distribution and thermal deformation characteristics of the large-ding structure.

[0012] Further, a plurality of main shaft seats for installing main shafts and mounting seats for overall fixation are arranged at the outer edge of the large-ding body, and the main shaft seats and the mounting seats are uniformly distributed along the axial center line of the barrel.

[0013] Further, the first support strip group is a closed ring structure, and a first through hole in a water-drop shape is arranged in the middle part, and the tip of the first through hole is folded towards the direction of the barrel; the second support strip group is a horseshoe structure, and a second through hole is arranged in the middle part, and the opening of the second through hole is directed towards the annular groove.

[0014] Further, the first support strip group and the second support strip group are arranged at an inclined angle relative to the radial center line of the barrel, and the inclined angle of the first support strip group is the same as or different from the inclined angle of the second support strip group.

[0015] Further, the width and thickness of the first support strip group are greater than those of the second support strip group, and the top of the side edge of the first support strip group is flush with or connected to the top of the side edge of the support body, and the top of the second support strip group is lower than the top of the side edge of the support body.

[0016] The beneficial effects of the present application are: The product structure of the present application is driven by the innovative design of CAE simulation, and the asymmetric support layout and the joint relationship of the first support strip group and the second support strip group are optimized, so that the load transmission path is more scientific and reasonable. The wide and thick first support strip group serves as the main load-bearing structure, providing high rigidity and strength; the thin second support strip group effectively assists in supporting and dispersing stress. This synergistic effect greatly improves the stress distribution of the overall structure, eliminates the stress concentration phenomenon in traditional design, thereby greatly improving the fatigue life and carrying capacity of the large cauldron, and reducing the risk of downtime due to structural failure.

[0017] The optimization method of the present application is based on CAE simulation technology, and the simulation results are used as the guide for iterative optimization of key design variables (such as support strip angle, shape, connection relationship). Through the complete closed loop of "parametric modeling → simulation evaluation → diagnosis adjustment → iterative optimization → manufacturing output", the stress concentration points, thermal deformation trends and resonance risks that cannot be predicted by traditional experience design are accurately identified. Through trial and error and optimization in a virtual environment, the optimal structure parameters are quickly found, the number of physical prototypes is reduced, the product development cycle is effectively shortened, and the development cost and market risk are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 A schematic diagram of the steps of the optimization method of the present application for a weft-knitted double-sided large circular machine large cauldron based on CAE simulation; Figure 2Schematic diagram of a process of optimizing a large tripod of a double-sided circular knitting machine based on CAE simulation according to the present invention; Figure 3 This is a schematic diagram of the overall structure of a large tripod of a weft knitting double-sided circular knitting machine based on CAE simulation of the present invention; Figure 4 This is a side structural schematic diagram of a large tripod of a weft knitting double-sided circular knitting machine based on CAE simulation of the present invention.

[0019] The reference numerals are: 1. Tripod body; 11. Spindle seat; 12. Mounting seat; 13. Annular groove; 2. Support body; 21. Gun barrel mounting tube; 22. First support bar group; 221. First through hole; 23. Second support bar group; 231. Second through hole. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods. Specific implementation method one: like Figure 1 、 Figure 2 As shown, a method for optimizing a large tripod of a weft knitting double-sided circular knitting machine based on CAE simulation is shown. The large tripod of the weft knitting double-sided circular knitting machine includes a large tripod body 1 with an annular structure. A support body 2 and a barrel mounting tube 21 are nested inside the large tripod body 1. The barrel mounting tube 21 is connected to the support body 2 by a first support bar group 22 and a second support bar group 23 arranged at intervals. The method includes the following steps: S1. Model establishment steps: Based on the initial design requirements and on the basis of the traditional cauldron, a parametric three-dimensional model is established, which includes the cauldron body 1, the support body 2, the annular groove 13, the barrel mounting tube 21, and the first support bar group 22 and the second support bar group 23. Simulation is performed by adjusting key design parameters.

[0022] The number, layout angle, width, thickness, through-hole shape, and connection relationship between the first and second support bar groups are all independently controllable key design parameters. Any design changes can be quickly implemented by modifying the key design parameter values, greatly improving optimization efficiency. S2, CAE simulation analysis step: 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 first data to comprehensively evaluate its performance; Among them, CAE simulation analysis includes: static structural analysis, thermodynamic coupling analysis and modal analysis; 1. Static structural analysis: to obtain the stress and deformation contours of the large cauldron under the limit working load, identify the maximum stress point and its value, and judge whether there is a risk of stress concentration; 2. Thermodynamic coupling analysis: to simulate the heat generation and dissipation during the operation of the device, and combine the structural coupling analysis of the parameterized three-dimensional model to calculate the temperature distribution contour and the thermal deformation contour of the large cauldron structure of the parameterized three-dimensional model under steady state, to evaluate the influence of thermal expansion on the structure precision; 3. Modal analysis: to calculate the natural frequency and mode shape of the structure of the parameterized three-dimensional model, predict its dynamic characteristics, ensure that the working speed is far away from the natural frequency of the structure, and avoid resonance between devices.

[0023] S3, identification and adjustment: compare the first data with the preset design indicators, make comprehensive diagnosis and optimization decision, identify the stress concentration area and thermal deformation sensitive area, and adjust the layout, shape, size, connection relationship and inclination angle of the first support bar group 22 and the second support bar group 23 in the support body 2 accordingly, and generate an updated large cauldron model after adjustment; 1. For stress concentration: if the local stress is too high, the geometry of the area is optimized first. For example, increase the width or thickness of the first support bar group 22 to strengthen the main load-bearing path; optimize the water drop shape of the first through hole 221 to make the transition smoother; or adjust the inclination angle of the first and second support bar groups to change the force flow direction and make the stress distribution more uniform; 2. For excessive thermal deformation: if the thermal deformation exceeds the tolerance, adjust the layout and thickness distribution of the support bar group to change the thermal rigidity of the structure and guide the thermal deformation to release in the direction with less impact on precision (such as the annular groove 13); 3. For resonance risk: if the modal analysis finds that the natural frequency coincides with the excitation frequency, change the mass and stiffness distribution of the support bar group (such as adjusting the size of the U-shaped opening of the second support bar group 23) to shift the natural frequency of the structure.

[0024] S4, report generation: take the updated large 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 meet the preset design indicators; based on the final iteratively optimized model parameters, generate manufacturing drawings and data.

[0025] Iterative execution of steps S2 and S3 means that the large cauldron structure of the parameterized three-dimensional model adjusted in step S3 is re-substituted into step S2 for a new round of CAE simulation analysis, and the new results are compared with the previous round and the preset design target, and the iteration process of S2→S3→S2 is executed in turn until all performance indicators meet the design requirements, at which time the final design scheme with the best performance is obtained; After locking the optimal parameterized three-dimensional model parameters after the final iteration, manufacturing files are generated, including the finalized three-dimensional engineering drawings and two-dimensional manufacturing drawings, and CAM data that can be used for numerical control machining is directly output, ensuring that the optimized design can be accurately converted into a high-performance product.

[0026] The optimization method of the present application is based on CAE simulation technology, and the simulation results are used as the guide for iterative optimization of key design variables (such as support bar angle, shape, and connection relationship). Through the complete closed loop of "parameterized modeling simulation evaluation diagnosis adjustment iterative optimization manufacturing output", the stress concentration points, thermal deformation trends and resonance risks that cannot be predicted by traditional experience design are accurately identified. Through trial and error and optimization in a virtual environment, the optimal structure parameters are quickly found, the number of physical prototype production and testing is reduced, the product development cycle is effectively shortened, and the development cost and market risk are reduced. Specific implementation method two: As shown in Figure 3 , Figure 4 The present application provides a technical scheme of a weft-knitted double-sided large circular machine large drum based on CAE simulation: it includes a large drum body 1 in a ring structure, the outer edge of the large drum body 1 is provided with a plurality of main shaft seats 11 for installing main shafts and mounting seats 12 for overall fixation, the main shaft seats 11 and the mounting seats 12 are uniformly distributed along the axial center line of the barrel mounting cylinder 21; The inside of the large drum body 1 is nested with a support body 2, an annular groove 13 is provided between the support body 2 and the large drum body 1, a barrel mounting cylinder 21 is provided at the center position of the support body 2, the barrel mounting cylinder 21 and the support body 2 are connected through the first support bar group 22 and the second support bar group 23 arranged at intervals, and at least a part of the side edge of the first support bar group 22 is connected with the second support bar group 23 to improve the stress distribution and thermal deformation characteristics of the large drum structure.

[0028] Among them, the first support bar group 22 is a closed ring structure, and a first through hole 221 in the shape of a water droplet is provided in the middle part, and the tip of the first through hole 221 is gathered towards the direction of the barrel mounting cylinder 21.

[0029] Among them, the closed ring structure forms a complete strong support frame, the mechanical transmission path is complete, the rigidity is significant, and the first through hole 221 in the shape of a water droplet is a special shape optimized based on CAE fluid mechanics and stress cloud simulation. This shape can extremely efficiently guide and diffuse the radial force and torsional force from the barrel mounting cylinder 21 to the entire bar group and even the support body 2 in the most smooth way, effectively avoiding the stress concentration phenomenon that is prone to occur at sharp corners in traditional circular or square openings, and improving the fatigue strength and service life.

[0030] And the second support bar group 23 is a horseshoe structure, and a second through hole 231 is arranged in the middle of the horseshoe structure, and the second through hole 231 is open towards the annular groove 13.

[0031] The open horseshoe design makes the structure have greater flexible deformation space while having certain support rigidity, and the design of the open second through hole 231 towards the annular groove 13 enables the structure to produce slight elastic deformation when bearing load, thereby playing a role of absorbing vibration energy and compensating for local thermal expansion deformation, rather than simply serving as a main bearing structure.

[0032] In order to realize the functional partition design, the width and thickness of the first support bar group 22 are greater than those of the second support bar group 23.

[0033] The wide and thick first support bar group 22 serves as a main support frame and is responsible for bearing and transmitting most of the main body load in the operation of the device, thereby providing macro rigidity and strength for the whole large cauldron, and the relatively thin and narrow second support bar group 23 serves as an auxiliary frame and is used for improving local stress distribution, inhibiting vibration and fine-tuning thermal deformation.

[0034] In order to better transmit stress, the first support bar group 22 and the second support bar group 23 are arranged at an inclined angle relative to the radial center line of the barrel mounting cylinder 21.

[0035] The inclined angle is the result of CAE multi-condition simulation optimization and is not simply radial arrangement. The design can make the force flow direction of the support bar group more consistent with the transmission path of the actual principal stress when facing the actual complex load from the main shaft, thereby greatly reducing unnecessary bending stress, making the force flow transmission more smooth and efficient, and making the overall stress distribution tend to be uniform.

[0036] In order to adapt to different functions, the inclined angle of the first support bar group 22 is the same as or different from the inclined angle of the second support bar group 23, that is, the angle parameters of the two can be independently optimized according to the different roles they play in the overall structure.

[0037] For example, the first support bar group 22 for main bearing can be arranged at an optimal force flow transmission angle, and the second support bar group 23 for auxiliary action can be arranged at an optimal vibration inhibition or thermal deformation compensation angle. This design freedom enables the CAE optimization to more finely adjust the comprehensive performance of the structure, thereby realizing the optimal solution of the overall performance.

[0038] In order to optimize the utilization rate of materials, the top of the side of the first support bar group 22 is flush with or connected to the top of the side of the support body 2, and the top of the second support bar group 23 is lower than the top of the side of the support body 2.

[0039] Among them, this stepped height difference enables the support body 2 to better guide the force flow and reduce unnecessary stress concentration, and may also facilitate demoulding or cooling during casting.

[0040] In summary, the product structure of this application, through innovative design driven by CAE simulation, optimizes the asymmetric support layout of the first support bar group 22 and the second support bar group 23, as well as the joint relationship between the two, making the load transfer path more scientific and reasonable. The wide and thick first support bar group 22 serves as the primary load-bearing structure, providing extremely high rigidity and strength; the thinner second support bar group 23 effectively provides auxiliary support and disperses stress. This synergistic effect greatly improves the stress distribution of the entire structure, eliminates the stress concentration phenomenon in traditional designs, and thus significantly increases the fatigue life and load-bearing capacity of the tripod, reducing the risk of downtime due to structural failure.

[0041] The above shows and describes the basic principles and main features of the present invention and the 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 present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be included within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0042] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods 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, to establish a 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.

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 shape of the through hole 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 big Ding body (1) and the support body (2) are further provided with an annular groove (13), 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.

7. A large creel for a weft knitting double circular machine according to claim 6, characterized in that: The outer edge of the big Ding body (1) is provided with a plurality of spindle seats (11) for mounting the main shaft and a mounting seat (12) for overall fixing, and the spindle 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) is a closed ring structure, and a first through hole (221) in the shape of a water drop 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-shaped 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) faces the annular groove (13).

9. 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).

10. 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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