Applied Research Of Structural Optimization Method In Computer Embroidery Machine

Computer embroidery machine is a kind of large and medium-sized machinery produced with the demand of hand embroidery to the market of large-scale embroidery.In the late 80s of last century,it began to have its own products through the introduction of technology into the country.At present,the computer embroidery machine can not only scale production of embroidery,but also have great application prospect in the mass customization of tourist sports shoes,and the market scale of embroidery machine is expanding continuously.But as a new machine,embroidery machine manufacturers' technology investment is relatively weak.There are many problems in the weight reduction of the embroidery machine structure,the improvement of the structural vibration performance,and the improvement of the stability of the transmission dynamic balance.Based on a prototype of a computer embroidery machine in China,this paper uses topology optimization,sensitivity analysis and transmission balance analysis theory to carry out related research in the following three aspects:1.The basic theory,assembly method and splitting method of substructure idea are introduced.The substructure of a certain type embroidery machine is disassembled,the main substructure,the topology optimization method based on the topological optimization method and the optimization criterion method of the variable density method and the optimization criterion method are used to obtain the topological shape of the embroidery machine's front and back substructures.Combined with the section size,3D model of the front and back sub structure is established,and the weight of the front and back substructure of the embroidery machine is optimized under the premise that the natural frequency of the structure remains unchanged.2.Introduced the method of solving the modal energy of Bernoulli beam.The theory and method of modal strain energy density synthesis are given.The synthesis modal strain energy density are presented as the sensitivity of the structural dynamic modification method.At the same time,a new structure model is established by taking the amplitude of the adjacent frequency vibration amplitude as the connection node.the modal strain energy density near the working frequency is weighted synthetically on the large span beam of the new embroidery machine model without support constraints,and the location of the bridge structure is determined and the number of bridge structure is discussed.and the maximum efficiency of the inherent frequency of the whole structure is improved.Optimized the position and number of restraints on the upper beam of the embroidery machine3.The balance theory method of the upper beam is discussed.Analysis of computer embroidery machine drive shaft dynamic unbalance reason.Using Adams virtual prototype simulation.Based on Adams virtual prototype simulation,the influence of the installation angle of the balancing cam of 1-4 head embroidery machines on the balancing performance of the moving shaft is preliminarily discussed.It is necessary to analyze the angle of the installation angle of the balance cam of the computer embroidery machine,which is 0 and 60 degrees.It can be used as a reference for the angle distribution of the multi head balancing cam and the further optimization of the design.