Feeding Mechanism Research And Feeding Device Optimization Of Cold Feed Rubber Extruder

Cold feed rubber extruder is one of the main process equipment of rubber products processing.Along the extrusion direction of the compound,the extruder can be divided into three functional sections : feeding section,plasticizing section and extrusion section.The feeding section is located at the inlet end of the extruder rubber,which is the most important functional section and plays a decisive role in the overall equipment efficiency of the extruder.The stronger the feeding ability,the higher the pressure of the rubber in the feeding section and the filling degree of the rubber,and the more sufficient and stable the supply of the rubber in the subsequent plasticizing section and the extrusion section.Only by ensuring the feeding capacity of the feeding device,the plasticizing section and the extrusion section can exert the optimal efficiency.Therefore,it is of great significance to study the feeding capacity of the feeding device.This paper takes the feeding device as the research object,and mainly completes the following research contents:(1)Taking the conventional side pressure roller feeding device of Φ120 rubber extruder as an example,through the combination of theoretical analysis and computer simulation,the influence of screw speed,thread lead,number of thread heads and depth of screw groove on feeding capacity was studied,and the influence of single factor on feeding capacity was analyzed.It is found that increasing the screw speed,reducing the thread lead and increasing the thread lead within the allowable range are helpful to improve the feeding capacity of the feeding device.In other cases,with the increase of the depth of the screw groove,the average value of the rubber pressure at the end of the feeding section increases first and then decreases.When the depth of the screw groove is 23.5mm,the average value of the rubber pressure at the end of the feeding section is the highest,and the feeding capacity of the feeding device is the best.Therefore,in practical production applications,increasing the screw speed and reasonably selecting the geometric structure parameters of the feed section screw can effectively improve the feeding capacity of the feeding device.(2)In order to quantitatively evaluate the feeding capacity of the feeding device,the orthogonal test method was used to analyze the range and variance of the simulation results,and the significant factors affecting the feeding capacity and the optimal level combination of the feeding capacity were obtained.Then with the help of SPSS analysis software,the quantitative mathematical model between feeding ability and various influencing factors was deduced by multiple linear regression analysis method.The absolute value of the pre-factor coefficient in the mathematical model indicates the degree of influence of the factor on the feeding capacity.The greater the absolute value,the higher the degree of influence.The mathematical model can be used as a theoretical reference for the structural design of the feeding device,and the mathematical model can be used to predict the feeding capacity and evaluate the feeding performance of the feeding device.(3)In order to verify the validity of the mathematical model of feeding capacity,based on the structure of the conventional Φ120 rubber extruder side roller feeding device,this paper takes the mathematical model as the design guide,optimizes the structure of the conventional feeding device,and compares the feeding effect of the feeding device before and after optimization.The results show that the optimized feeding capacity is 25.5 % higher than that before optimization,and the optimization effect is obvious.In this paper,through the research on the feeding mechanism of cold feed rubber extruder,the mathematical model between feeding capacity and various influencing factors is deduced,and the quantitative evaluation of feeding capacity is realized.Based on the model,the structure of the conventional feeding device was optimized,and the optimization effect was verified by experiments.Therefore,the research results of this paper have certain theoretical guiding significance and engineering practice value for the structural design of the feed device of the cold feed extruder.