The Application And Study Of Topology Optimization Design In Twin-Screw Oil Press Extruder

As a press tool for oil crops,twin-screw oil press extruders are widely used at present.However,There are some following problems in the use of twin-screw oil press extruders:the actual production capacity of the oil press extruder is relatively low.The arrangement of parallel?horizontal and shoulder by shoulder of twin-screw is easy to cause cake chips cumulating,which seriously affects the effect of application and so on.The working principle of twin screw oil press extruder is mainly as follows:the spare volume of chamber which is composed of twin-screw and the squeezing cage outside the package is gradually reduced,so as to achieve the squeeze to material.Therefore,the pressing chamber is the key to press out oil.But at present,the design of the press cage is mainly based on the experience.This kind of experiential design is lack of scientific nature to a certain extent,the design cycle is too long and the design result is not ideal.As a result,the size of the cage is larger,the weight is biased,the structure is not reasonable,and the cost of the material is on the high side.As the supporting part of twin-screw press,the structure design of the frame should not only consider the need of bearing load,but also take into account the economic benefits.In order to solve the above problems,this thesis redesign the transmission device,squeeze device,feedstock device and cake-out device based on the design theory of twin-screw extruder.The vertical arrangement of the twin-screw in the press device can effectively reduce the stacking phenomenon caused by the horizontal arrangement.The feedstock device adopts horizontal and vertical feeding simultaneously,and the horizontal feedstock device controlled by frequency conversion motor,which can better control the speed of feedstock and better control the pressure in the press chamber.And the finite element analysis of the key component-twin-screw is analysed by Abaqus,which carry out to verify the rationality of the structure.The compression ratio of the press chamber in this design is 21,which improves the press efficiency of the twin-screw press to some extent.The bi-directional evolutionary structural optimization method(BESO)provides the optimal force transfer path of the structure theoretically.And it is easy to program,so this paper introduces the bi-directional evolutionary structural optimization method into the design of press cage and the body frame.Based on Abaqus platform and the interface between Python and Abaqus,the program of BESO is imported into Abaqus,and the press cage and the body frame of twin-screw oil press extruder are optimized.On the basis of topology optimization,the structure of the press cage and the body frame are redesigned.The mass of the new press cage and the new body frame reduce 35.1%?49.7%,respectively,and they can satisfy the strength and stiffness.This paper provides a new idea for the design of key parts of twin-screw oil press extruder.