振动式果树根系断切装置设计与试验
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现代农业产业技术体系建设专项资金项目(CARS-27)和河北省现代农业产业技术体系水果创新团队项目(HBCT2018100205)


Design and Analysis of Vibratory Root System Cutting Device for Fruit Trees
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    摘要:

    针对矮砧密植果园根系管控中根土复合体阻力过大,果树根系断切作业不理想等问题,设计一种振动式果树根系断切装置。对切割装置受力模型分析可知,影响阻力的因素主要有锯齿弯刀参数、根土复合体参数、根土复合体与锯齿弯刀参数及作业方式参数。对振动式果树根系断切装置切割装置进行设计与分析,应用有限元仿真软件对切割装置进行切割根土复合体模拟分析,切割装置振动状态下平均切削受力为236.97N,不振动状态下平均切削受力为432.35N,达到振动减阻目的。切割装置土槽试验表明,振动状态下所受水平合力均值均小于不振动状态下所受水平合力均值225.34N,振动状态下切割根土复合体作业效果良好,对根系以及土壤起到锯切效果,减小切削阻力。通过振动状态下切割装置切割根土复合体正交试验分析可知:最优作业参数为偏心距20mm,转速3r/s,土槽作业平台前进速度0.2m/s;土壤扰动量的主要影响因素是偏心距和前进速度;影响切割装置入土稳定性主要因素为偏心距和转速,观察作业现场得知入土深度稳定,满足入土要求。整机试验表明:根系平整切割占比左侧为21.05%、右侧为17.39%,锯切占比左侧为78.95%、右侧为82.61%,由此可知,振动式果树根系断切装置作业过程中振动断切装置对根土复合体起到锯切效果,减小机具和切割装置所受阻力,起到减阻效果;由试验现场可知,机具稳定性良好,作业后留下20~25mm沟壑,与入土切割装置厚度20mm一致。土壤外翻程度小,土壤弥合较好。

    Abstract:

    Aiming at the problems of excessive resistance of the root-soil complex in the root system control of the short anvil dense planting orchard, and the unsatisfactory cutting operation of the fruit tree root system, a vibrating fruit tree root system cutting device was designed. The analysis of the force model of the cutting device showed that the main factors affecting the resistance were the parameters of the sawtooth machete, the parameters of the root-soil complex, the parameters of the root-soil complex and the sawtooth machete, and the parameters of the operation mode. The cutting device of the vibrating fruit tree root system was designed and analyzed, and the finite element simulation software was used to simulate and analyze the cutting device “root-soil complex”. The average cutting force of the cutting device under vibration was 236.97N, and under no vibration state the average cutting force was 432.35N, achieving the purpose of vibration drag reduction. The soil trough test of the cutting device showed that the average value of the horizontal resistance under the vibration state was less than the average value of 225.34N under the non-vibration state. The effect of cutting the “root-soil complex” under the vibration state was good, and it saw the root system and the soil. Through the orthogonal test analysis of the cutting device to cut the “root-soil complex” under vibration, it can be seen that the optimal operating parameters were eccentricity of 20mm, rotation speed of 3r/s, forward speed of soil trough working platform of 0.2m/s;the main influence factors of soil disturbance were eccentricity and forward speed;the main factors that affected the stability of the cutting device were eccentricity and speed. The test of the whole machine showed that the proportion of root leveling cutting was 21.05% on the left side, 17.39% on the right side, 78.95% on the left side and 82.61% on the right side for sawing. The result showed that the operation process of the vibrating fruit tree root cutting device had a sawing effect on the root-soil complex, reducing the resistance of the machine and the cutting device, and had a drag reduction effect;from the test site, it can be seen that the machine had good stability, leaving a 20~25mm ravine after operation. The thickness of the cutting device was the same as 20mm. The degree of soil eversion was small, and the soil was better. Through the design of vibrating fruit tree root system cutting device, finite element simulation analysis and soil tank test, it provided a idea for fruit tree root system cutting and provided a reference for the design of vibration drag reduction device.

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毛雷,王鹏飞,杨欣,李建平,李雪军,李昕昊.振动式果树根系断切装置设计与试验[J].农业机械学报,2020,51(s1):281-291. MAO Lei, WANG Pengfei, YANG Xin, LI Jianping, LI Xuejun, LI Xinhao. Design and Analysis of Vibratory Root System Cutting Device for Fruit Trees[J]. Transactions of the Chinese Society for Agricultural Machinery,2020,51(s1):281-291.

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  • 收稿日期:2020-08-12
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  • 在线发布日期: 2020-11-10
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