Authors

Abstract

In response to the problems of low efficiency and difficulty of pruning operations in modern dwarf dense orchards, an adjustable position saw blade pruning machine was designed, mainly consisting of a pruning device, a regulating device and a hydraulic system. Through the mechanical and modal analysis of the circular saw blade, the limit speed of the circular saw blade was derived. A finite element model of the sawing process was established, and a single-factor simulation analysis was conducted for three important parameters: feed rate, circular saw blade speed and branch diameter, and a three-factor, three-level quadratic regression orthogonal test was designed to derive the best matching sawing parameters, which was verified in field tests. The test results showed that the average passing rate was 92.8% at the feed rate of 4 km/h under the circular saw blade speed of 2800 rpm, which was higher than 88.8% at 3 km/h and 88.9% at 5 km/h. The optimum sawing parameters were: the circular saw blade speed of 2800 rpm and feed rate of 4 km/h, which were consistent with the simulation results, and the passing rate of the cut was high at this time, meeting the technical requirements of orchard pruning.

Abstract in Chinese

针对现代矮砧密植果园修剪作业效率低、操作难度大等问题，设计了一种姿态可调节的锯片式修剪机械，主要由修剪装置、调节装置和液压系统组成。通过圆锯片的力学和模态分析，得出圆锯片极限转速。建立锯切过程的有限元模型，对进给速度、圆锯片转速和枝条直径三个重要参数进行单因素仿真分析，以此设计三因素三水平的二次回归正交试验，得出配合最佳的锯切参数，并进行田间试验验证。试验结果表明：在圆锯片转速2800rpm的情况下，进给速度4km/h时的平均合格率为92.8%，高于3km/h时的88.8%和5km/h的88.9%，得出配合最佳的锯切参数为：圆锯片转速2800rpm，进给速度4km/h，与仿真结果一致，此时切口的合格率高，满足果园修剪的技术要求。