Design And Experimental Research On Shelling And Separation Structure Of Camellia Oleifera

The composition and physical and chemical properties of tea oil are similar to those of olive oil,and are very popular among consumers.In recent years,the tea oil processing industry has developed rapidly and the oil production technology is mature.However,in the production of tea oil raw materials,there are still problems such as difficulty in shelling and separation,low efficiency,and insufficient precision.The existing processing technology cannot carry out effective shelling and separation.During the storage process,Camellia shells are prone to mildew,which contaminates the tea seeds and reduces the safety of the tea oil raw materials.In this paper,an innovative design of a camellia fruit shelling and separation is carried out,and the following researches are carried out based on the index of removing cattail,the impurity content of tea seeds,the effective yield of tea seeds and their weighted average scores:1.The characteristics of Camellia oleifera fruit.Taking Camellia oleifera fruit produced in Ruijin area of Jiangxi Province as the research object,the test results showed:The diameter of Camellia oleifera fruit was between 10mm～60mm;The thickness of tea shell was distributed in 1mm～6mm;The size of the long side of tea seeds was distributed in the range of 8mm to 31 mm,and the size of the short side was distributed in the range of 2mm to 25 mm.The size of tea shells is similar to tea seeds.The densities of Camellia oleifera,tea cattail,and tea seed were 0.938 g/cm3,0.843 g/cm3,1.033 g/cm3,respectively;The horizontal breaking force of Camellia oleifera fruit was greater than the vertical breaking force,the average value of horizontal breaking force was 416N,and the average of vertical breaking force was 330N.2.Structural design and modeling.The paper determined the technical plan of "cutting-shelling-separating",and used CAD three-dimensional software for the design of cutting structure,shelling structure and separation structure are carried out.The cutting structure was composed of a pair of rollers,and the surface of the rollers has short teeth;Shelling structure was mainly composed of flexible rubber plates,connecting shafts,etc.;The separation structure adopted the structural form of a trommel screen.The paper completed machine design,according to the movement characteristics of each structure,carried out assembly and production line virtual design.3.Finite element analysis and simulation.The analysis results showed that the design materials of each structure meet the statics requirements.Movement simulation results showed that the same material at different speeds(140r/min,160r/min,180r/min)has showed irregular changes.There is a big difference from theoretical analysis.4.Process parameter test.In the pre-experiment,most of the shape size of the tea puffer after the "cutting-Shelling" is less than 10mm.The paper took the cutting roller speed,roller center distance,shelling speed,separating sieve speed,and screen aperture as influencing factors.The paper set the hulling rate,the percentage of impurities in the seeds,the effective yield of tea seeds and their weighted average scores as the indicators and carried out prototype test.The single-factor test results show that:each factor has different degrees of influence on each index.The highest rate of shelling is 98.5%,the lowest impurity rate in seeds is 7.4%,and the highest effective yield is 96.4%.The test results using roller center distance and shelling speed as two factors show that the main effect of each index of shelling speed is not significant,while the main effect of roller center distance on each index is significant;the two factors only have an interactive main effect to the weighted average score.When the cutting speed is 150r/min,the separating screen speed is 160r/min,the screen aperture is arranged in multiple stages,the roller center distance is 250mm,and the tailing speed is 280r/min,this weighted average score is the highest,68.96.t Under the highest score,the removal rate was 93.8%,the impurity content in the seeds was 11.4%,and the effective yield was 83.2%.