Research On Key Technologies Of Fully Automatic Self-stacking Spiral Quick-freezing Equipment

Currently,the most advanced quick-freezing equipment on the international market is the automatic self-stacking spiral quick-freezing device.The device has the advantages of high production efficiency,high degree of automation,small footprint,good sanitation and so on,leading the future development trend of new food quick-freezing equipment.Based on the analysis of the main structure and working principle of self-stacking spiral quick-freezing device,this paper studies the key technologies,such as conveying system,transmission system and multi-motor proportional synchronous control of the device,and then guides the development and optimization of the device.The main contents of this paper are as follows:(1)Based on the analysis of the main structure and working principle of the self-stacking spiral quick-freezing device,the parts and causes of the failure of the flexible conveying system and the transmission system were studied,and a series of improvement and optimization schemes were put forward.(2)The trajectories,self-locking structures and self-telescoping structures of conveyor belts were studied to ensure the smooth formation of the belt tower.The material,structure and self-supporting position of the supporting plate at home and abroad were studied,and the weak point were designed and optimized.(3)The layout and structure of the spiral rolling guide rail were studied.The compactness of the system and the formation of the spiral tower were put forward,and the unfavorable factors which affect the stable operation of the guide rail were summarized.Based on the Hertz contact theory,the mathematic model of the contact stiffness of the guide rail system was established.A bearing type rolling guide rail was proposed and validated.(4)Aiming at the proportional synchronous control of the inner and outer driving motor and the discharge motor of the spiral rolling guide,the appropriate control structure algorithm was analyzed and selected.The speed ratio of the driving motor was analyzed and calculated.The fuzzy PID controller was studied and designed,and the stability and good robustness of the proportional synchronous control of the three motors were verified by MATLAB/Simulink.