Research On Fluid Transmission System Of Continuous Supercritical CO₂ Extraction Equipment

Supercritical fluid extraction technology has the natural advantages of good separation effect,high extraction product quality,energy saving and environmental protection,and is an emerging separation technology.However,at present,supercritical fluid extraction technology has serious defects in continuous extraction and automation,and multiple loading and unloading operations are required in the continuous extraction process,which increases the production cost and does not meet the production needs.The author of this paper designs a fluid transmission system of continuous supercritical CO₂ extraction equipment,which realizes the automation of the loading and unloading cycle of the silo of the continuous extraction system,improves the production efficiency of operation,and promotes the automation process of continuous supercritical fluid extraction equipment.Through the analysis of the development history of supercritical fluid extraction equipment at home and abroad,the silo cycle operation process of continuous supercritical fluid extraction system is clarified based on the continuous extraction silo circulation device,the production automation is realized,and the structure and form of the main device in the system are selected.According to the design requirements and operating characteristics of the control system of continuous extraction equipment,the hydraulic schematic diagram or pneumatic schematic diagram of the clamp opening and closing subsystem,silo push in and exit subsystem,silo loading and unloading and transportation subsystem.Calculate the parameters of hydraulic or pneumatic components of the subsystem and make reasonable selection.For the clamp to open quickly and conveniently,and reduce the cylinder to bear the working load,reasonable design of clamp and cylinder installation scheme.The energy loss of the silo propulsion and withdrawal subsystem during the silo conveying motion is calculated,which provides a theoretical basis for the analysis of system energy consumption.According to the working stability of the silo conveying system,the combined frame was designed and the strength was calculated.According to the silo operation process,the PLC control system of silo transportation was designed,the I/O distribution table and I/O wiring diagram of the control system were analyzed,and the basic composition and working principle of the control system were discussed.In order to improve the work efficiency,the robotic arm was selected for silo transportation,the robotic arm model was established according to the D-H parameters,the forward and reverse kinematics were analyzed,and the spatial cloud point map was drawn and simulated.The results of the tertiary polynomial and quinth-order polynomial interpolation trajectory planning of the robotic arm under the joint space show that the five-order polynomial joint angular motion curve is continuous smooth without mutation,which has more application value.