Optimization Of Bag-opening And Blanking Mechanism Of Non-coated Woven Bag Packaging Machine

Non-coated woven bag packaging has been widely used in feed and chemical industries,etc.In the early stage,we designed the "Automatic Solid Particle Material Bagging System" according to the market demand,and carried out assembly and debugging.However,in the actual debugging,the woven bag was prone to deviation,which led to the failure of bagging.At the same time,there are other problems,such as insufficient clamping force of swing arm mechanism for bag opening,occasional failure of some parts,etc.Aiming at the above problems,this thesis carried out research from the aspects of bagging reliability optimization,stress analysis of woven bags and mechanical structure optimization.The main research contents and conclusions are as follows:The function and performance requirements of the material bagging system are described.The existing deficiencies of the existing material bagging system are analyzed,which are the lack of rigidity of the bagging arm mechanism,the deviation of the woven bag mouth caused by the quadrilateral bagging,the failure of bagging caused by the friction between the woven bag and the hopper.So the hexagonal bagging method is proposed.The main influencing factors affecting the reliability of bagging are analyzed,the reliability mathematical model of the hexagonal bagging method is established,and the most reliable combination of the hexagonal bag mouth size and the hopper door size is obtained by using MATLAB to solve the problem.RecurDyn was used to establish a simulation model of the hopper door bagging,considering that the new plan is better than the old plan by comparing the force situation.A mechanical model was established,and the force of the woven bag in the process of opening the hexagonal bag was analyzed.Then the force on the woven bag was solved by MATLAB,and the constraint condition of the hexagonal bag opening was determined from the angle of force and displacement.At the same time,RecurDyn was used to establish a simulation model of clamping jaw bag opening.The comparison showed that the numerical calculation results are almost the same as the simulation results,and the reliability is high,which lays a theoretical foundation for the subsequent realization of the hexagonal open bag blanking program.According to the bag opening size from calculation and the force of the woven bag during the bag opening process,the design of the hexagonal bag opening and blanking plan is completed.The structure of the existing bag opening and blanking mechanism has been optimized,such as optimizing the swing arm mechanism to provide the clamping force required for bag opening,optimizing the hinge of the swing arm mechanism,the hopper door transmission mode,and strengthening some of the failed parts to improve the institutional reliability.In addition,reducing the number of parts based on the DFMA principle.The debugging results show that the optimized clamping force and parts of the swing arm mechanism meet the requirements of use.