川芎收获机振动碎土机构设计与特性研究

Research on Design and Characteristic of Vibrating Earth Crushing Mechanism of Ligusticum Wallichii Harvester

针对川芎挖掘收获时川芎-土壤混合物易堵塞、碎土分离困难等问题,设计了双摇杆抛摔碎土振动机构,并进行了机构运动学特性研究。通过解析法对振动碎土机构进行运动学分析和建模,获得了碎土振动机构的运动特性,利用Adams进行碎土机构运动学仿真,得到了机构质心位移、速度、加速度,验证了振动碎土机构的运动规律和碎土能力。结果表明,双摇杆抛摔碎土机构的曲柄在转角为22.4°时,混合物被向后抛离且水平运动67.1 mm,大于收获机前进距离39.7 mm,实现向后输送混合物并碎土分离,避免了壅土现象发生。该研究为川芎收获机振动碎土机构设计提供了理论支持。

Considering the Ligusticum wallichii-soil mixture is easy to block and the broken soil is difficult to separate when the Ligusticum wallichii is excavated and harvested,a vibration mechanism of double rocker threw broken soil is designed,and the kinematic characteristics of the mechanism are studied. The kinematic analysis and modeling of the vibrating earth breaking mechanism are carried out by analytical methods,the kinematics of the earth breaking vibration mechanism is obtained,the kinematic simulation of the earth breaking mechanism is carried out using Adams,the centroid displacement,velocity and acceleration of the mechanism are obtained,and the motion law and soil crushed ability of the vibrated soil crushed mechanism are verified.The results show that when the crank of the double rocker threw and crushed mechanism are at a turned angle of 22.4°,the mixture would be thrown away,and the horizontal backward movement distance is 67.1 mm,which is greater than the forward distance of the harvester 39.7 mm,realizes the backward conveyed of the mixture,the separation of the broken soil and avoids the occurrence of soil clogging. This research provides theoretical support for the design of the vibration crushing mechanism of the Ligusticum wallichii harvester.