Design Of 3D Mobile Platform For Skin 3d Printing And Temperature Control System

With the rapid aging of the population and the frequent occurrence of various major diseases,more and more people need to use the means of tissue and organ transplantation to restore health and prolong life.Unfortunately,the number of organ donations is far from meeting the needs of patients in present,and patients with allogeneic organ transplantation will also need to take drugs for a long time due to immune rejection.3D bio-printing is created to solve this problem.Following this hot topic,this study designed a 3D mobile platform system and temperature control system around the construction of 3D biological printer.In order to meet the functional requirements of the 3D biological printer,the temperature control performance of the temperature control system and the printing performance of the 3D mobile scaffold were tested by printing the scaffold.In order to realize the 3D movement of the printer,a platform for X,Y and Z axis movement was built.Three DM422 stepping motor drivers was used to control the X,Y and Z axis movement platform.In order to ensure the sufficient precision of the motors,the stepping motor subdivision parameter is set as 4000.The overall framework of the mobile platform is designed,the control strategy of the platform movement is analyzed,and the circuit and control program are designed.On the other hand,the temperature control system is designed.The temperature control model is established and the fuzzy control algorithm is added to improve the temperature control effect of the temperature system.The temperature control system has reached the control precision of 0.7°C through the rise and drop test and constant temperature test of the temperature control system,which basically meets the system requirements.The water in the scaffold printed with 1% m/v and 3% sodium alginate solution was more likely to evaporate and the droplets were more likely to converge.The skin scaffold model printed with 5% m/v sodium alginate solution has a good forming effect,the scaffold has clear lines and is not easy to evaporate.By testing the porosity of the scaffold as 1×1mm and the fiber diameter as0.5mm,the feasibility of using the 3D mobile platform for printing and artificial tissue construction was verified.