Research On Spinneret Cleaning Mechanism Design And Process Parameters Optimization

Spinneret is a core precise component in chemical fiber production.After being used for a period of time,the spinneret surface is easy to bond dirt,block the spinneret holes and affect the spinning quality.At present,the spinneret is regularly cleaned by workers,which is easy to scald workers in high temperature environment.It is urgent to design an automatic spinneret cleaning machine to assist workers to complete this dangerous work.By designing the spinneret cleaning mechanism and researching the process parameters,an automatic spinneret cleaning experimental platform is built.The relevant research contents are as follows:Firstly,the automatic spinneret cleaning process is designed according to the manual spinneret cleaning process,and the corresponding motion mechanisms are designed: the moving mechanism,the spinneret cleaning mechanism and the blade cleaning mechanism.The collision between the blade and the spinneret in the moving process is analyzed,and the rigid collision and elastic collision models are respectively established,and the collision force is compared to design the elastic buffer structure.At the same time,the "revolution and rotation" spinneret cleaning mechanism,the blade self-cleaning mechanism and protective shell are designed.Secondly,the optimization of two key process parameters（cleaning angle and cleaning force）which affect the spinneret cleaning effect are researched.For the cleaning angle,the shear theory and bond slip theory are established to describe the viscoelastic dirt stripping theory.The optimal cleaning angle to clean the dirt under different bond strength is obtained in turn,and the functional relationship between the optimal cleaning angle and bond strength is fitted by the least square method.For the cleaning force,the minimum torque of the motor is obtained by calculating the horizontal shear force required to clean the dirt,and the vertical extrusion force range is calculated based on the fact that the blade can cut into the dirt without damaging the spinneret surface.Thirdly,ABAQUS is used to simulate cleaning PP dirt and PET dirt with different bonding strength,and it is verified that the dirt can be cleaned clearly and the total energy of the system is the smallest under the corresponding optimal cleaning angle.The blade wear under different extrusion force and cleaning angles is simulated by DEFORM-3D,and the variation curve of wear with them is obtained.Finally,by making the mechanical system and designing the control system,the automatic spinneret cleaning platform is built and experimental research is carried out.According to the simulation results,some comparative experiments are designed.The results showed that when the extrusion force is about 50 N and the cleaning angle is 45 °,the PP dirt can be cleaned clearly and the blade wear is the smallest.Comparing different spinneret cleaning methods,it is found that the blade wear is less when "revolution and rotation" mechanism is used.Comparing the dirt with different bonding strength,it is found that PP dirt is easier to clean than PET dirt.