小型果园升降作业平台的设计与试验

Design and experiment of small lifting platform in orchard

针对南方丘陵山区水果生产中采摘、疏花等作业环节劳动强度大、机械设备少、人工作业效率低,已有设备在丘陵山区作业时通过性不强、易失稳等问题,设计制造了一种小型履带自走式剪叉升降作业平台,该机器具有较小的底盘尺寸,能够控制回转支承进行方位调节,通过液压油缸实现升降、角度调整,使得载人工作台可调平,以提高机器稳定性能。对样机进行了模拟工作环境下的爬坡角度、转弯半径、调平以及倾翻稳定性能测试,相关指标达到了设计要求。结果表明,样机可升降高度1.2 m,最大行驶速度0.25 m/s,最小转弯半径0.75 m,不同负载和升降高度下平台的坡地静态倾翻角集中在（15°-30°）之间等,满足了工作要求。同时,样机外形尺寸较小,操控简便,适合南方果园种植模式和使用要求。

Lifting platform in orchard is of great importance to the fruit production, because it plays a vital role in the operation links： picking, flower thinning, etc. However, current mechanical devices are not suitable for orchard in the southern hillside area due to the complex terrain. It means low efficiency and the need for more farmers. Mechanization is the only way to change the present situation. Therefore, based on studying and analyzing the collected data of orchard in south China, a miniature self-propelled lifting platform was developed to increase the operation efficiency in orchard in the southern area. The lifting platform was mainly composed of the crawler, scissors elevating mechanism and a multi-function manned worktable. In particular, the manned worktable was designed to realize the real-time leveling through the means of azimuth adjustment, lifting and angle adjustment which were separately driven by revolving support and hydraulic cylinders. In order to maintain stability of the worktable and increase worker＇s comfort, the secondary leveling was crucial. In order to make the platform has the advantages of small external size, compact structure and easy to assemble, the dimensions of the mechanism and main technical parameters of key parts were optimized based on preliminary experiments. The prototype was made in a machine processing factory and driven directly by a 4.41 k W diesel engine. With the aim to evaluate the performance of the platform, tests of the prototype including climbing angle test, turning radius test, leveling performance test, and stable performance test were carried out in the simulated work environment. The experimental results indicated that the running speed of the prototype was 0.12-0.25 m/s, and the maximum lifting height was 1.2 m, and the turning radius was 0.75-1.34 m, which meet the design requirements and are suitable for the varied working environments. In addition, the simulation results revealed that the static tipping angle of the prototype was between 15°-30° when the platform was equipped with different loads and in various lifting height. Moreover, the mechanism can adjust the inclination angle of the manned worktable through the secondary leveling, which demonstrated that this mechanical platform can be used to work in difficult terrain. But because the distribution of weight is uneven and the chassis touches the ground in a small area, the stability of the whole machine is decreased. All the experiments concluded that the lifting platform met the needs of fruit production and fruit transportation. Meanwhile, with smaller outline size, it is easy to operate and suitable for orchard planting pattern and use requirements in the South. The study provides guidance for the practical production.