A simulation and optimization method for dynamic balance of rotary chopper drum

Abstract

The invention discloses a simulation and optimization method for the dynamic balance of a rotary chopper drum. On a SOLIDWORKS platform, a three-dimensional model of a rotary chopper is drawn, and an assembly is assembled according to work requirements; the structural characteristics of the drum body are analyzed, and secondary dynamic balance optimization is performed on the drum body as a whole; the dynamic balance of the chopper shaft is optimized; the dynamic balance optimization design of the drum body is performed; a two-dimensional scheme diagram is drawn and split into two-dimensional parts diagrams for trial production; a dynamic balance experiment is performed after the improved rotary chopper is installed; the invention provides a solution for the sixteen-open rotary chopper drum to meet the dynamic balance requirements, and the structural design eliminates the unstable vibration when running at high speed, and the working stability of the folding knife ensures the folding accuracy requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of printing and relates to a simulation and optimization method for dynamic balance of a rotary chopper cylinder. Background Art

[0002] In the printing industry, there are higher requirements for the speed and stability of the sixteen-page folding device. The existing sixteen-page folding device mainly realizes the folding function through a reciprocating chopper and a rotary chopper. The reciprocating chopper uses the crankshaft to drive the connecting rod to reciprocate. The movement will cause a large reciprocating inertia force of the crank-connecting rod mechanism, which increases the inertia load on the bearing. The system vibrates strongly due to the unbalanced inertia force. It can be concluded that the reciprocating motion limits the increase in the output shaft speed. For the rotary chopper, as long as the corresponding dynamic balance accuracy requirements are met, it will not produce a large impact at a higher folding speed, which can effectively ensure the folding quality.

[0003] However, the dynamic balance optimization of the sixteen-open rotary machete has become a technical bottleneck that restricts the promotion and application of the rotary machete. The current solution is mainly to use dynamic balancing machine equipment, according to the data feedback of the equipment, to manually correct the dynamic balance of the entire sixteen-open drum by adding or removing weight multiple times until the technical standards are met. The whole process is complicated and cumbersome, which greatly increases the manual workload and seriously affects the production efficiency of the company's related products; under high-speed conditions, the large number of balancing blocks added to the drum may fly out due to loose high-speed bonding, causing unsafe accidents; the addition of a large number of dynamic balancing blocks seriously affects the appearance of the product. The cause of the dynamic imbalance of the sixteen-open rotary machete is mainly the initial imbalance of the structural design. The present invention can provide a dynamic balancing pre-optimization design method for a rotary machete drum. Summary of the invention

[0004] The purpose of the present invention is to provide a simulation and optimization method for the dynamic balance of a rotary chopper drum. By analyzing the structural characteristics of a sixteen-open rotary chopper drum, dynamic balancing simulation calculations are performed based on SOLIDWORKS, and corresponding structural optimization pre-designs are performed on the chopper working axis and the chopper drum body, so that the sixteen-open rotary chopper drum body can meet the dynamic balancing accuracy requirements at high speed and realize the folding accuracy requirements of a roll paper book machine.

[0005] The technical solution adopted by the present invention is a simulation and optimization method for dynamic balancing of a rotary chopper drum, which is specifically implemented in the following steps:

[0006] Step 1: Draw a 3D model of the rotary machete on the SOLIDWORKS platform and assemble the assembly according to the work requirements;

[0007] Step 2, analyzing the structural characteristics of the drum body and performing secondary dynamic balancing optimization on the drum body as a whole;

[0008] Step 3, dynamic balance optimization of the chopper shaft;

[0009] Step 4: Optimize the design of dynamic balance of the drum;

[0010] Step 5: Draw a two-dimensional plan drawing and split it into two-dimensional parts drawings for trial production;

[0011] Step 6: Perform a dynamic balancing test after the improved rotary chopper is installed.

[0012] The present invention is also characterized in that:

[0013] The specific process of step 2 is: adopting secondary graded dynamic balancing and alignment, firstly, the balance simulation and alignment optimization of the chopper shaft is carried out, and then the optimized chopper shaft is assembled with the drum body, and the secondary dynamic balancing optimization is carried out on the whole;

[0014] Step 3 is specifically implemented as follows:

[0015] Step 3.1, based on the symmetrical structural characteristics of the chopper shaft, perform static balance optimization on it;

[0016] Step 3.2, use the "Design Example" function to set parameters for the optimized size of the chopper shaft;

[0017] Step 3.3, in the Design Case-Variable View, complete the range setting, constraint range setting, and target setting of the set parameters and variables, perform optimization range setting, and add the center of mass coordinate sensor. After the setting is completed, click the Run button to optimize the calculation and obtain the optimization result;

[0018] Step 3.4, adjust parameters according to the optimization results and optimize again;

[0019] Step 3.5, record the optimized size data as the size data of the chopper shaft, and complete its model update;

[0020] Step 4 is specifically implemented as follows:

[0021] Step 4.1, in SOLIDWORKS, assemble the optimized chopper shaft on the rotary chopper drum to ensure that the gear meshing, folding knife working state, and component material settings are consistent with the actual state;

[0022] Step 4.2, rotation axis constraint setting: set the support axis and bearing as point and line constraints;

[0023] Step 4.3, apply SOLIDWORKS Motion and SOLIDWORKS Simulation plug-ins: use the motor function to set the power of the 16-open rotary chopper drum, set its motor drive position, rotation direction and speed; use the calculation button to perform simulation calculations; and extract data from the results and diagrams;

[0024] Step 4.4, after the correction and optimization in steps 1 to 4, the above simulation calculation process is performed again for further correction and optimization, and the golden section optimization correction is performed several times until the design requirements are met;

[0025] The specific settings in step 4.3 are: force-reaction force-result component selection (radial)-bearing and support shaft matching, deriving the force-time phase relationship diagram of the support shaft and bearing at both ends, obtaining the magnitude and phase of the force, and using F=mv 2 / r is derived to determine the phase and mass of the two end disks that need to be weighted or removed, and the corresponding three-dimensional model is modified and optimized.

[0026] The beneficial effects of the present invention are:

[0027] The simulation and optimization method of the dynamic balance of a rotary chopper drum of the present invention provides a solution for the structural design of the sixteen-open rotary chopper drum to meet the dynamic balance requirements, eliminates the unstable vibration when running at high speed, and the working stability of the folding knife ensures the folding accuracy requirements; in the structural design stage of the sixteen-open rotary chopper drum, simulation and reasonable calculation are carried out to realize the dynamic balance design of the drum structure, save the efficiency of manual alignment of the dynamic balancing machine in the later stage, reduce the labor intensity of workers, and save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a commercial wheel folding machine in a simulation and optimization method for dynamic balancing of a rotary chopper drum of the present invention;

[0029] Figure 2 It is a BB-direction cross-sectional view in the structure diagram of the commercial wheel folding machine in the simulation and optimization method of the dynamic balance of the rotary chopper drum of the present invention;

[0030] Fig. 3 (a) to (h) are respectively the simulation results of the dynamic balance of the rotary chopper drum at speeds of 100r / m, 200r / m, 300r / m, 400r / m, 500r / m, 600r / m, 700r / m and 750r / m in the SOLIDWORKS environment before optimization in a simulation and optimization method for the dynamic balance of a rotary chopper drum of the present invention;

[0031] 4(a) to (h) are respectively the simulation results of the dynamic balancing of a rotary chopper drum at speeds of 100r / m, 200r / m, 300r / m, 400r / m, 500r / m, 600r / m, 700r / m and 750r / m in the SOLIDWORKS environment after optimization in a simulation and optimization method for the dynamic balancing of a rotary chopper drum of the present invention.

[0032] In the figure, 1. power gear, 2. drum body, 3. knife shaft, 4. folding knife, 5. planetary gear, 6. sun gear, 7. intermediate gear. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The present invention is applied to the latest series of business wheel folding machines of Beiren. The complete technical solution of the present invention is described in detail on the 546 folding machine:

[0035] The transmission principle of the housing: the structure of the 16-open rotary chopper drum, the power gear 1 is the power input of the entire drum, the sun gear 6 is fixed to the frame, the planetary gear 5 realizes power transmission with the sun gear through the intermediate gear 7, the planetary gear 5, the knife shaft 3 and the folding knife 4 are a whole, and are supported and assembled on the drum body 2 through the bearing. During the working process, the power gear 1 rotates to drive the drum body 2 to rotate, the intermediate gear 7 rotates around the sun gear 6, drives the planetary gear 5 to rotate, and then drives the folding knife 4 to rotate periodically to complete the folding action;

[0036] Problems: In the dynamic balancing test results of the 16-open rotary chopper drum, the chopper drum support shaft was subjected to a large radial force, which did not meet the requirements of dynamic balancing accuracy G6.3;

[0037] Simulation calculation: The 16-open rotary chopper drum was 3D modeled and dynamic balancing simulation was performed based on SOLIDWORKS. The calculation results were close to the test results, proving the accuracy of the simulation results.

[0038] Part set structure analysis:

[0039] In order to make the chopper drum body meet the requirements of dynamic balancing accuracy G6.3, it is necessary to reduce the original unbalance caused by the asymmetric design; the rotation of the chopper working shaft is achieved through the rotation of the chopper drum, and at the same time, its rotation will also affect the rotation of the chopper drum. If the chopper working shaft has a high dynamic balancing accuracy, it can be regarded as a stationary part on the chopper drum; if the dynamic balancing accuracy of the chopper working shaft does not meet the requirements, its rotation will generate periodic radial force on the chopper drum, thereby affecting the overall dynamic balancing accuracy of the chopper drum body;

[0040] Structural improvement ideas: According to the structural characteristics of the sixteen-opening rotary chopper, in order to achieve the dynamic balance condition of the entire drum body, the dynamic balance structure simulation optimization of the chopper shaft structure composed of the knife shaft 3, folding knife 4, and planetary gear 5 is first carried out based on SOLIDWORKSD; then, on this basis, the dynamic balance simulation structure optimization of the entire drum body is carried out.

[0041] The present invention provides a simulation and optimization method for dynamic balancing of a rotary chopper drum, which is specifically implemented in the following steps:

[0042] Step 1: Draw a 3D model of the rotary machete on the SOLIDWORKS platform and assemble the assembly according to the work requirements;

[0043] Step 2, analyzing the structural characteristics of the drum body, the present invention adopts secondary graded dynamic balancing and alignment, firstly performs the balance simulation and alignment optimization of the folding knife shaft, then assembles the optimized folding knife shaft with the drum body, and performs secondary dynamic balancing optimization on the whole;

[0044] Step 3, dynamic balance optimization of the chopper shaft:

[0045] Step 3.1, based on the symmetrical structural characteristics of the chopper shaft, the static balance is optimized to achieve the purpose of dynamic balance optimization;

[0046] Step 3.2, use the "Design Example" function to set parameters for the optimized size of the chopper shaft;

[0047] Step 3.3, in the Design Case-Variable View, complete the range setting, constraint range setting, and target setting of the set parameters and variables, perform optimization range setting, and add the center of mass coordinate sensor. After the setting is completed, click the Run button to optimize the calculation and obtain the optimization result;

[0048] Step 3.4, according to the optimization results, adjust the parameters and optimize again until the technical design requirements are met;

[0049] Step 3.5, record the optimized size data as the size data of the chopper shaft, and complete its model update;

[0050] Step 4: Optimization design of drum dynamic balance:

[0051] Step 4.1, in SOLIDWORKS, assemble the optimized chopper shaft on the rotary chopper drum to ensure that the gear meshing, folding knife working state, component material settings, etc. are consistent with the actual state;

[0052] Step 4.2, setting of rotation axis constraints: In order to reduce the adverse effects of redundant constraints on the simulation during motion simulation, the support shaft and bearing are set as point and line constraints instead of surface constraints;

[0053] Step 4.3, use SOLIDWORKS Motion and SOLIDWORKS Simulation plug-ins: Use the "Motor" function to set the power of the 16-open rotary chopper drum, set its motor drive position, rotation direction and speed; press the "Calculate" button to perform simulation calculations; "Results and Diagrams" to extract data, set: Force-Reaction Force-Result Component Selection (Radial)-Bearing and Support Shaft Matching, derive the force-time phase relationship diagram of the support shafts and bearings at both ends, and obtain the magnitude and phase of the force, through F=mv 2 / r derivation, determine the phase and mass of the two end disks that need to be weighted or removed, and modify and optimize the corresponding three-dimensional model;

[0054] Step 4.4, after the correction and optimization in steps 1 to 4, the above simulation calculation process is performed again for further correction and optimization, and the golden section optimization correction is performed several times until the design requirements are met;

[0055] Step 5, use Auto CAD to draw a two-dimensional plan drawing, and split it into two-dimensional parts drawings for trial production;

[0056] Step 6: After the improved rotary chopper is installed, a dynamic balancing test is performed to verify that the experimental results meet the dynamic balancing accuracy requirements, proving that the rotary chopper drum dynamic balancing design simulation and optimization method based on SOLIDWORKS is feasible and effective.

[0057] Comparison of optimization results:

[0058] The SOLIDWORKS dynamic balancing simulation results of the rotary chopper drum before optimization are as follows Figure 3(a) to Figure 3(h) ;

[0059] The SOLIDWORKS dynamic balancing simulation results of the optimized rotary chopper drum are as follows: Figure 4(a) to Figure 4(h) ;

[0060] By comparison:

[0061] This optimization design makes the peak value of the change cycle of the dynamic unbalanced reaction force between the support shafts and bearings at both ends of the rotary chopper drum more regular, indicating that the optimization design of the folding knife shaft is effective;

[0062] The SOLIDWORKS-based simulation optimization design of the dynamic balance of the rotary chopper drum makes the dynamic imbalance reaction force between the support shafts and bearings at both ends of the drum body smaller than the allowable range value, meeting the design requirements, with reliable structure and stable operation, meeting the production requirements of the equipment.

[0063] The simulation optimization method used this time is successful and effective, and can greatly improve the efficiency of dynamic imbalance optimization design of mechanical designers. This method can be promoted and is valuable;

[0064] The use of this optimized design method has greatly reduced the design, manufacturing and production costs of the rotary chopper drum and improved the quality of the company's products.

Claims

1. A simulation and optimization method for dynamic balancing of a rotary chopper drum, characterized in that: Please follow the steps below to implement: Step 1: Draw a 3D model of the rotary machete on the SOLIDWORKS platform and assemble the assembly according to the work requirements; Step 2, analyzing the structural characteristics of the drum body and performing secondary dynamic balancing optimization on the drum body as a whole; Step 3, dynamic balance optimization of the chopper shaft; Step 4: Optimize the design of dynamic balance of the drum; Step 5: Draw a two-dimensional plan drawing and split it into two-dimensional parts drawings for trial production; Step 6, after the improved rotary chopper is installed, a dynamic balance test is performed; The specific process of step 2 is: adopting secondary graded dynamic balancing and alignment, firstly performing balance simulation and alignment optimization of the chopper shaft, and then assembling the optimized chopper shaft with the drum body, and performing secondary dynamic balancing optimization on the whole; The step 3 is specifically implemented according to the following steps: Step 3.1, based on the symmetrical structural characteristics of the chopper shaft, perform static balance optimization on it; Step 3.2, use the "Design Example" function to set parameters for the optimized size of the chopper shaft; Step 3.3, in the Design Case-Variable View, complete the range setting, constraint range setting, and target setting of the set parameters and variables, perform optimization range setting, and add the center of mass coordinate sensor. After the setting is completed, click the Run button to optimize the calculation and obtain the optimization result; Step 3.4, adjust parameters according to the optimization results and optimize again; Step 3.5, record the optimized size data as the size data of the chopper shaft, and complete its model update; The step 4 is specifically implemented according to the following steps: Step 4.1, in SOLIDWORKS, assemble the optimized chopper shaft on the rotary chopper drum to ensure that the gear meshing, folding knife working state, and component material settings are consistent with the actual state; Step 4.2, rotation axis constraint setting: set the support axis and bearing as point and line constraints; Step 4.3, apply SOLIDWORKS Motion and SOLIDWORKS Simulation plug-ins: use the motor function to set the power of the 16-open rotary chopper drum, set its motor drive position, rotation direction and speed; use the calculation button to perform simulation calculations; and extract data from the results and diagrams; Step 4.4, after the correction and optimization of steps 1 to 4, the above simulation calculation process is carried out again for further correction and optimization, and after several golden section optimization corrections, the design requirements are met.

2. The method for simulating and optimizing the dynamic balance of a rotary chopper drum according to claim 1, characterized in that: The specific settings in step 4.3 are as follows: force-reaction force-result component selects radial-bearing and support shaft matching, derives the force-time phase relationship diagram of the support shafts and bearings at both ends, obtains the magnitude and phase of the force, and determines the phase and mass of the two end surface disks that need to be weighted or removed by deducing F=mv² / r, and corrects and optimizes the corresponding three-dimensional model.

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