摘要
为了增强割草机在复杂地形条件下的作业能力,开展了割草机折叠机构优化与液压仿形系统研究,使折叠机构具备±30°的摆动范围,液压仿形系统可顺利通过250 mm的凸起路面。通过对折叠机构不同工况的姿态分析以及运动学、有限元分析,试制出适用于幅宽3.2 m割草机的折叠机构,通过野外试验验证了折叠机构具备±30°的摆动范围。研制液压仿形系统,解决折叠机构刚性连接的问题,通过ADAMS-AMESim联合仿真技术验证液压仿形方案的可行性,结果表明液压仿形系统通过250 mm波形路面过程中,蓄能器气囊体积变化范围为0.4~0.7 L,切割器接地压力变化范围为1700~2500 N。将试制的仿形系统搭载在折叠机构上,在安徽省芜湖市三山区进行田间试验,结果表明:样机能顺利完成割草机折叠动作,满足各种工况下的力学和强度要求;切割器具备了±30°以内的摆动范围;搭载仿形系统的试验样机可以顺利通过250 mm高度的波形凸起路面,提高了割草机在丘陵山区作业的地形适应能力,可为悬挂式割草机折叠机构的设计、割草机接地仿形技术提供参考。
In order to solve the problem of forage harvesting in hilly and mountainous areas,the folding mechanism of the hanging large-width lawn mower was optimized,the operation ability of the lawn mower under complex terrain conditions was enhanced,and the operation efficiency of the lawn mower was improved.In order to expand the swing angle range of the folding mechanism,the size requirements of each component were analyzed and calculated under the condition that the folding mechanism can achieve positive and negative swing of 30°.The ADAMS simulation software calculation showed that the maximum pulling force of the hydraulic cylinder of the folding mechanism was 51600 N.It was calculated that the maximum stress value of the rotating arm was 216.67 MPa,and according to the theoretical calculation results,a folding mechanism suitable for a 3.2 m wide lawn mower was trial-produced.Folding mechanism,a matching hydraulic profiling system was developed,the profiling system adopted the method of providing auxiliary oil source for the lifting hydraulic cylinder,and was connected to the accumulator through a check valve and a stop valve at the oil inlet of the hydraulic cylinder.The initial volume of the accumulator was 2.0 L,and the pre-charge pressure was 7.0 MPa.The ADAMS-AMESim co-simulation technology was used to simulate and analyze the folding mechanism and the profiling system.The volume variation range of the airbag of the cutter was 0.4~0.7 L,and the variation range of the ground pressure of the cutter was 1700~2500 N.Finally,the trial-produced profiling system was mounted on the folding mechanism,and a field test was carried out in Sanshan District,Wuhu City,Anhui Province.The results showed that the prototype can successfully complete the folding action of the lawn mower and meet the mechanical and strength requirements under various working conditions.The mower had a swing range of±30°;the test prototype equipped with the profiling system can smoothly pass through the 250 mm high wave convex road,which improved the terrain adaptability of the lawn mower in hilly and mountainous areas,and can be used for hanging mowers.It provided a reference for the design of the lawn mower folding mechanism and the grounding profiling technology of the lawn mower.
作者
祝露
尤泳
王德成
张楠
马伟
刘照启
ZHU Lu;YOU Yong;WANG Decheng;ZHANG Nan;MA Wei;LIU Zhaoqi(College of Engineering,China Agricultural University,Beijing 100083,China;DeBONT(WUHU)Agricultural Machinery Co.,Ltd.,Wuhu 241002,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2022年第9期122-130,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
工信部2020年苜蓿智能收获成套装备项目(TC200H02G)
关键词
悬挂式割草机
折叠机构
液压仿形
hanging mower
folding mechanism
hydraulic profiling
