To investigate the operational mechanism and quality improvement strategies of a reed upright conveying device,first,the structural design was completed,and a force analysis of the conveying process was conducted.A ri...To investigate the operational mechanism and quality improvement strategies of a reed upright conveying device,first,the structural design was completed,and a force analysis of the conveying process was conducted.A rigid-flexible coupling simulation model of reed stalks and the conveying mechanism was then employed to examine the effects of the structural parameters of the conveying chain links on the maximum contact force exerted on the reed stalks and to identify the optimal parameter combination.High-speed photography experiments were carried out during the conveying process to capture the motion states and trajectories of the reed stalks,elucidating the causes of stalk breakage and blockages.Subsequently,response surface experiments were conducted to investigate the primary factors influencing upright conveying quality.Mathematical models for predicting damage rate and conveying rate were established,and the effects of various factors on these indicators were analyzed.Multi-objective optimization of the regression models was performed based on practical production requirements,yielding an optimal parameter combination:transverse conveying speed of the chain at 1.1 m/s,speed ratio of 1.2,and upper conveying chain position at 1.37 m.Experimental results indicated a damage rate of 11.90%and a conveying rate of 95.11%,meeting the operational requirements for mechanized reed harvesting and conveying.These findings provide fundamental theoretical data for the development of reed harvester conveying components and the selection of operational parameters.展开更多
In order to solve the problems of unclear film separation in traditional topsoil residual film recovery machine and secondary broken film caused by the toot-shaped structure,a film-soil conveying and vibration separat...In order to solve the problems of unclear film separation in traditional topsoil residual film recovery machine and secondary broken film caused by the toot-shaped structure,a film-soil conveying and vibration separation device was designed.It mainly consists of a first-level vibration conveying chain,roller extrusion and crushing mechanism and secondary conveyor chain,which can complete the functions of conveying,vibration separation,and crushing separation of film-soil composite.Firstly,the mechanical model of the transport process of the film-soil composite was established,and the transport stability of the film-soil composite was analyzed.The vibration characteristics of the vibration mechanism were analyzed by analytical method,and the vibration model of the vibration mechanism was established.The distribution state of residual film-soil mixture was observed and measured by high-speed camera,and the influence of vibration wheel speed and installation distance on the distribution height of residual film-soil mixture was found out.The crushing mechanism of the residual film-soil composite was proved by studying the roller extrusion and crushing mechanism.The Box-Behnken response surface test method was used to carry out field tests on the transport and vibration separation device of film-soil with soil content rate and film leakage rate as evaluation indices.The results indicated that the influencing factors on the soil content rate in a dscending order are conveyor chain speed,vibration wheel speed,and installation distance.In contrast,the factors affecting the film leakage rate,also ranked from largest to smallest,are conveyor chain speed,installation distance,and vibration wheel speed.The combination of film-soil separation parameters is as follows:conveying chain speed is 1.6 km/h,vibration wheel speed is 189.7 r/min,installation distance is 769.7 mm,at this time the soil content rate is 18.31%,and the film leakage rate is 9.49%,which meet the requirements of the recovery of residual film in the plough layer.The conveying and vibration model established in this study can provide a theoretical basis and technical reference for elucidating the soil-film separation process.展开更多
To improve the quality and efficiency of peanut half-feed harvesting in clay hilly areas in South China and address problems such as excessive soil clumps,broken branches,and seedlings in pods,difficulty in cleaning i...To improve the quality and efficiency of peanut half-feed harvesting in clay hilly areas in South China and address problems such as excessive soil clumps,broken branches,and seedlings in pods,difficulty in cleaning impurities,and the need for manual picking owing to the high soil viscosity and easy hardening,a new half-feed peanut cleaning picker suitable for southern clay hilly areas,including its overall structure and transmission system,was designed.The picker can perform the operations of soil removal,clamping and conveying of seedlings,and orderly pod picking and pod gathering.The structural design of key components and the analysis and determination of key parameters were carried out.By adopting a crank rocker mechanism,a soil removal device was designed.A single-side chain clamping conveying device,which consists of a clamping chain,a pretightening spring,and a guide rail,was designed.A phase tangent configuration of opposite rollers was used to design a pod picking device.Thus,the functions of the half-feed peanut picker,such as cleaning and removing soil,smooth and reliable clamping and conveying,and flexible pod picking,were realized.The field test revealed that when the picking rate was greater than 97%,the soil removal pods drop rate was less than 10%,and the soil removal rate was greater than 50%.The performance indicators meet the design requirements.This study provides a technical reference for the research and development of clean picking technology for upright peanuts in the clay hilly areas of southern China.展开更多
基金supported by Special Funds for Jiangsu Province Agricultural Science and Technology Independent Innovation Fund Project(Grant No.CX3096)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(Grant No.31-NIAM-05).
文摘To investigate the operational mechanism and quality improvement strategies of a reed upright conveying device,first,the structural design was completed,and a force analysis of the conveying process was conducted.A rigid-flexible coupling simulation model of reed stalks and the conveying mechanism was then employed to examine the effects of the structural parameters of the conveying chain links on the maximum contact force exerted on the reed stalks and to identify the optimal parameter combination.High-speed photography experiments were carried out during the conveying process to capture the motion states and trajectories of the reed stalks,elucidating the causes of stalk breakage and blockages.Subsequently,response surface experiments were conducted to investigate the primary factors influencing upright conveying quality.Mathematical models for predicting damage rate and conveying rate were established,and the effects of various factors on these indicators were analyzed.Multi-objective optimization of the regression models was performed based on practical production requirements,yielding an optimal parameter combination:transverse conveying speed of the chain at 1.1 m/s,speed ratio of 1.2,and upper conveying chain position at 1.37 m.Experimental results indicated a damage rate of 11.90%and a conveying rate of 95.11%,meeting the operational requirements for mechanized reed harvesting and conveying.These findings provide fundamental theoretical data for the development of reed harvester conveying components and the selection of operational parameters.
基金supported by the Science and Technology Innovation Leading Talent Project(Grant No.2024TSYCLJ0014)the Xinjiang Agricultural Machinery R&D Manufacturing Promotion and Autonomous Region Graduate Research Innovation Project(Grant No.XJ2024G103)the Xinjiang Uygur Autonomous Region“Unveiling and Leading”Project“High-Quality and High-Efficiency Mechanized Recovery Technology R&D and Equipment Application for Farmland Plastic Film Residue”,and the Xinjiang Uygur Autonomous Region“Unveiling and Leading”Project(Grant No.XJJBGS-MG202403).
文摘In order to solve the problems of unclear film separation in traditional topsoil residual film recovery machine and secondary broken film caused by the toot-shaped structure,a film-soil conveying and vibration separation device was designed.It mainly consists of a first-level vibration conveying chain,roller extrusion and crushing mechanism and secondary conveyor chain,which can complete the functions of conveying,vibration separation,and crushing separation of film-soil composite.Firstly,the mechanical model of the transport process of the film-soil composite was established,and the transport stability of the film-soil composite was analyzed.The vibration characteristics of the vibration mechanism were analyzed by analytical method,and the vibration model of the vibration mechanism was established.The distribution state of residual film-soil mixture was observed and measured by high-speed camera,and the influence of vibration wheel speed and installation distance on the distribution height of residual film-soil mixture was found out.The crushing mechanism of the residual film-soil composite was proved by studying the roller extrusion and crushing mechanism.The Box-Behnken response surface test method was used to carry out field tests on the transport and vibration separation device of film-soil with soil content rate and film leakage rate as evaluation indices.The results indicated that the influencing factors on the soil content rate in a dscending order are conveyor chain speed,vibration wheel speed,and installation distance.In contrast,the factors affecting the film leakage rate,also ranked from largest to smallest,are conveyor chain speed,installation distance,and vibration wheel speed.The combination of film-soil separation parameters is as follows:conveying chain speed is 1.6 km/h,vibration wheel speed is 189.7 r/min,installation distance is 769.7 mm,at this time the soil content rate is 18.31%,and the film leakage rate is 9.49%,which meet the requirements of the recovery of residual film in the plough layer.The conveying and vibration model established in this study can provide a theoretical basis and technical reference for elucidating the soil-film separation process.
基金financially supported by National Natural Science Foundation of China(Grant No.52105263)Jiangsu Agricultural Science and Technology Innovation Fund(Grant No.CX(23)3028)+2 种基金Key Laboratory of Modern Agricultural Intelligent Equipment in South China,Ministry of Agriculture and Rural Affairs,China(Grant No.HNZJ202201)Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co-construction by Ministry and Province)Ministry of Agriculture and Rural Affairs(Grant No.QSKF202304).
文摘To improve the quality and efficiency of peanut half-feed harvesting in clay hilly areas in South China and address problems such as excessive soil clumps,broken branches,and seedlings in pods,difficulty in cleaning impurities,and the need for manual picking owing to the high soil viscosity and easy hardening,a new half-feed peanut cleaning picker suitable for southern clay hilly areas,including its overall structure and transmission system,was designed.The picker can perform the operations of soil removal,clamping and conveying of seedlings,and orderly pod picking and pod gathering.The structural design of key components and the analysis and determination of key parameters were carried out.By adopting a crank rocker mechanism,a soil removal device was designed.A single-side chain clamping conveying device,which consists of a clamping chain,a pretightening spring,and a guide rail,was designed.A phase tangent configuration of opposite rollers was used to design a pod picking device.Thus,the functions of the half-feed peanut picker,such as cleaning and removing soil,smooth and reliable clamping and conveying,and flexible pod picking,were realized.The field test revealed that when the picking rate was greater than 97%,the soil removal pods drop rate was less than 10%,and the soil removal rate was greater than 50%.The performance indicators meet the design requirements.This study provides a technical reference for the research and development of clean picking technology for upright peanuts in the clay hilly areas of southern China.
