水田除草机底盘转向液压系统设计与试验

Design and Test of Steering Hydraulic System for Paddy Field Weeding Machine Chassis

摘要:

针对现有水田除草机存在转弯半径大、转向稳定性差、难以适应作业环境等问题，本文设计了一种底盘转向液压系统。通过Amesim软件建立转向液压系统仿真模型，分析前后转向液压缸在不同转角输入下位移响应;利用Recurdyn软件对水田除草机底盘模型进行四轮转向工况运动学仿真，探究底盘在转向过程的质心垂向和侧向加速度变化;将该转向液压系统应用于水田除草机底盘，转向性能试验结果表明，水田除草机底盘最小转弯半径为3.04 m，比理论值3.08 m减小1.3%，有效减少了压苗率;在不同转角条件下，前后液压缸位移平均误差为0.3 mm，最大误差为1.2%，保证了水田除草机在转向过程中稳定性和作业精度。研究结果为水田除草机底盘转向系统提供了一种可行方案。

Abstract:

Aiming at the problems such as large turning radius, poor steering stability and difficult to adapt to the working environment of the existing paddy field weeder, a hydraulic steering system for the chassis of paddy field weeder was designed. Firstly, the simulation model of the steering hydraulic system was established by Amesim software, and the corresponding relationship between the displacement of the front and rear steering cylinders under different angle signals was analyzed. Secondly, in Recurdyn, the differential steering was used to simulate the four-wheel steering condition of the rice weeder chassis model, and explore the changes of vertical and lateral centroid acceleration of the chassis in the steering process. Finally, the steering hydraulic system was applied to the chassis of a paddy field weeder, and the minimum turning radius test and steering cylinder displacement test were carried out. The results showed that the minimum turning radius of chassis of paddy field weeder was 3.04 m, which was 1.3% smaller than the theoretical calculation value of 3.08 m, but the error was within the acceptable range, which met the design requirements and effectively reduced the seedling compression rate. Under different angle conditions, the average error of front and rear cylinder displacement was 0.3 mm, and the maximum error was 1.2%, which met the requirements of four-wheel steering, and ensured the stability and operation accuracy of the paddy field weeder in the steering process. The research can provide a feasible scheme for the steering system of the paddy field weeder chassis, and it effectively improved the existing problems of the paddy field weeder.