摘要
针对托盘式蔬菜的封膜装置,在现有对保鲜膜进行三面切割的切割方式的基础上,为简化驱动、简化控制从而降低制造成本,提高蔬菜产品市场竞争力,基于曲柄滑块机构和滚轮滑槽的联动机构对托盘式蔬菜封膜装置进行了创新设计,提出了托盘式蔬菜封膜装置方案,运用MATLAB软件对作为传动装置的曲柄滑块机构进行了最佳传力性能设计,确定最小传动角42°,曲柄长度140mm,连杆长度340mm,偏心距109mm。对滚轮滑槽联动机构进行了结构参数设计,确定单个滑槽纵向长度226mm,横向长度97mm。通过Solid Works软件建模对摆动杆、纵切板和横切杆进行运动学仿真分析,并对强度较低的横切杆和摆杆这2个关键构件进行静力学仿真,通过模拟其工作状态的受力情况找出易破坏点。按照结构参数设计和静力学仿真结果进行了样机制作,并依照动力学仿真设定的参数设计试验。试验结果表明在气缸无阻力运行时的平均速度为79mm/s,最大速度为110mm/s情况下,气缸驱动纵切板和横切杆的切割速度最大可分别达到690和290mm/s,工作效率达到40次/min,与仿真效果吻合。装置实际运行过程平稳,无速度突变和抖动,且能够将气缸速度放大到切割构件上而便于对保鲜膜进行切割。其工作效率也远超过目前设备的效率要求。仿真与实测效果都表明本方案具有较高的可行性,为今后相关设计研究提供参考。
The vegetables packed by plastic trays and fresh-keeping film are getting more and more popular in our life. So the tray-type vegetables preservation machine has became one of hot research areas in the world. During the working process of film sealing for vegetables in the tray, film is cut from three directions and sealed based on self-adhesive property. The complex movements about packing in this type cause that the drive parts of film sealing device are more complicated. It not only makes the manufacturing hard, but also leads to the rising costs. All these disadvantages limit the application and popularization of tray-type vegetables preservation machine. Based on this cutting method, the innovation design of film sealing device was carried out by using the linkage mechanism of roller chute and crank-slider mechanism to simplify the drives and reduce manufacturing cost in this study. As a drive mechanism, crank-slider mechanism was designed by using MATLAB for the optimal transmission performance when it was working. According to the calculation, the key design parameters of crank-slider mechanism were determined as follows： the minimum transmission angle was 42°; the length of crank was 140 mm; the length of connecting rod was 340 mm; the length of connecting rod was 340 mm; the eccentric distance was 109 mm. And the structure parameter of linkage mechanism for roller chute was also designed. Its dynamic characteristics were obtained using the simulation of three-dimensional kinematics of cylinder, transverse cutting bar and longitudinal cutting plate using SolidWorks Motion. When the average speed of cylinder was 90 mm/s, the cutting speed of transverse cutting bar and longitudinal cutting plate were 710 and 310 mm/s, respectively, and work efficiency was up to 50 time/ min. By analyzing the working method of design scheme, transverse cutting bar and swing rod were found to have the lowest intensity. Using the SolidWorks simulation, the most vulnerable part of transverse cutting bar and swing rod was dis
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2015年第5期9-16,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(51275005)--基于综合性能指标体系的穴盘苗夹持装置创新优化设计方法研究
北京市创新人才培养计划(Z121104002512018)--全柔性采摘机器手臂关键技术
科技部创新方法工作专项课题(创新方法专项)(2013IM030700)
关键词
包装机
膜
装置
托盘式蔬菜
封膜装置
曲柄滑块
样机试验
packaging machines
films
equipment
tray type vegetables
film sealing device
crank slider
prototype
