Study On Absorbing Machine Of Residual Liquid In Laser Photocuring Resin Printed Parts

Because the photosensitive resin used in laser photocuring resin 3D printer has viscosity,and if the printed parts has a complex inner cavity,there will be a amount of photosensitive resin attached to the inner surface of the printed parts,resulting in the waste of photosensitive resin material.The problem to be solved in this project is to recover the residual resin inside the 3D printed parts with laser curing resin.A mechanism is proposed which can enter into the interior of the print through the process hole.The mechanism is controlled to rotate from the top of the printed parts to the bottom(process hole position).The walking path can cover all the inner surfaces of the printed parts and can be passively adjusted to adapt to different inner surfaces of the printed parts.By referring to relevant literature on adaptive mechanism,fluid analysis,continuous liquid carrying theory analysis,gas-liquid two-phase flow analysis,etc.A scheme of absorbing mechanism is designed.After a complete design scheme is proposed,Solidworks software will be used to build a virtual prototype.And the absorbing mechanism adaptive spring design,as well as the rotary mechanism,drawing mechanism of the transmission thread design.Force analysis was carried out on the absorbing mechanism when it was working inside the printing parts.Through analysis,by analyzing the elastic force of the self-adaptive spring on the drawing strip,the design reliability of the drawing strip was verified by mechanical analysis.The three-dimensional model of the absorbing mechanism was imported into ADAMS to simulate the working process of the absorbing mechanism,and the velocity and displacement curves of the absorbing head were obtained.The displacement differentce curve of the absorbing head of each turn was obtained through the displacement curve.When the absorbing head of the absorbing mechanism was in contact with the bottom of the printed parts,two driving modes were used to drive the absorbing head respectively.The displacement curve of the absorbing head was obtained and compared to choose a better driving mode.When absorbing head contact on printed parts around the wall,to establish adaptive mechanism in ADAMS,in the process of work adaptive spring compression process simulation in the rotating shaft of the elastic curve,the data imported to MATLAB,the function of the force curve was obtained by fitting the curve,and the function is used in WORKBENCH as a driving function for dynamic analysis of threaded screws.Since the working principle of the absorbing mechanism is to recover the resin residue through pipelines through air extraction,the possible two-phase flow patterns are briefly described.According to different pipe placement modes,force analysis was carried out on the droplet carried by the internal air core,and a theoretical model of continuous liquid carrying was established.The stress analysis of liquid film in inclined pipe was carried out,and the model of continuous liquid-carrying liquid film was obtained.The internal flow channel model of the absorbing mechanism was established,and the two-phase flow in the pipeline was analyzed by importing and using Fluent software.CFD simulation of the absorbing process was carried out by setting pipes with different inclinations,liquid content and pipe diameter as influencing factors.The vacuum pump was used to connect the pipeline and absorbing head,and experiments were carried out under different Settings to verify the absorbing capacity under different conditions.The above theoretical model,absorbing mechanism and influence rule were verified through experiments,so as to contribute to the subsequent related research.