| With the continuous development of China’s animal husbandry,the feed industry supporting its development has been greatly developed.In terms of ruminant roughage,crop straw feed has become an important support to promote the development of ruminant animal breeding industry in China.In order to improve the utilization rate of crop straw feed,China’s feed industry is also studying its new technology.The crushing and mixing(enzyme preparation)process of straw is an important part of its processing.The straw mixing effect will affect its feed quality.It is very necessary to vigorously develop straw feed mixing equipment.At present,China uses a horizontal ribbon mixer for straw mixing.Because of its simple structure,wide application range and low price,it has low mixing efficiency and is prone to segregation and stickiness when materials with large mixing capacity.The disadvantages of poor uniformity of the knot material.According to the requirements of straw blending,a single-shaft double-layer paddle type feed mixer was designed,and its mixing performance was studied by theoretical analysis,simulation analysis and verification test.The main research contents and conclusions of this paper are as follows:(1)Design and analysis of single-shaft paddle mixing rotor.A single-axis single-layer and double-layer paddle mixing rotor was established.For the characteristics of the straw feed in this test,the parameters of the granular material were determined and the mixing uniformity evaluation model was established.The EDEM simulation software was used based on the discrete element method.It was subjected to comparative test analysis.It is determined that the single-shaft double-layer paddle mixing rotor has better mixing effect.The optimal design structural parameters of the mixing rotor are determined by the material deviation coefficient P3<P2<P1: the inner blade 4 blades are installed at an angle of 45°.The four small blades of the layer are installed at an angle of 30°,and the blade mounting angles on both sides of the shaft end are 45°.(2)Based on the discrete element method,the EDEM simulation software was used to simulate the influencing factors of the mixing process of the single-shaft double-layer paddle type feed mixer.Through simulation test analysis,the mixing rotor speed,mixing chamber fullness coefficient and mixing time have obvious influence on the mixing performance of the mixer.Theoperating parameters of the feed mixer are determined by single factor simulation test: the mixing rotor speed is 45r/min,the mixing chamber is filled with a factor of 0.6.According to the above parameters,the simulation experiment of material particle trajectory tracking is carried out.The simulation results show that the mixed inner diameter of material movement under the action of double-layer paddle type mixed rotor is different,and the trajectory of infinitely close to the spiral in the mixing chamber Movement,and mixing the inner blade of the rotor during the mixing process acts to increase the velocity of the material.(3)Based on the research and analysis of the mixing process,a single-shaft double-layer paddle type feed mixer was designed.The machine is mainly composed of a mixing rotor,a machine casing,a frame,a transmission mechanism,etc.The CATIA three-dimensional modeling software is used to model and assemble the components of the mixer,and a three-dimensional model of the single-shaft double-layer paddle type feed mixer is established.The ANSYS software was used to perform finite element static analysis on the mixed rotor of mixed key components(4)Perform a verification test of a single-shaft double-layer paddle type feed mixer.Based on the analysis of the existing mixing mechanism,the mixing performance of the feed mixer was tested.The results showed that the mixing uniformity of the materials in the mixing chamber of the feed mixer was high,and the mixing quality requirements were met.The feed mixer can achieve a uniform mixing of the feed. |
