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Yu X.,Northeast Agricultural University | Zhao Y.,Northeast Agricultural University | Zhao Y.,Heilongjiang Province Grain Production Capacity of Collaborative Innovation Center | Chen B.,Northeast Agricultural University | And 3 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

This paper describes the significance of transplanting agronomy for the development of China agriculture, and points out that the transplanting machine, especially the potted-seedling transplanting machine, will be the one to substantially increase the per unit area yield of grain and play the positive role of transplanting for increasing grain production in North China Cold Area and promoting farmers to get rich. After reviewing the history of transplanting equipments in the world, it is indicated that the development of transplanting machinery is generally divided from low to high into three stages, the slide-mechanism stage, bar-mechanism stage, and rotary-mechanism stage. This paper analyzes the development status and research level of the transplanting machinery at home and abroad, and forecasts the prospects of development trend. It is emphasized that in order to enter the rotary-mechanism stage of the potted-seedling transplanting machinery, the researchers must master the mechanism and related theories, computer knowledge and the operation, and secondary development skills of commercial software. The paper also puts forward a series of proposals on some current domestic important development trend.

Zhao Y.,Northeast Agricultural University | Zhao Y.,Heilongjiang Province Grain Production Capacity of Collaborative Innovation Center | Fan F.,Northeast Agricultural University | Fan F.,Heilongjiang Province Grain Production Capacity of Collaborative Innovation Center | And 10 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

The European Community is an international leader in dry field transplanting machines. The core working part of its vegetable transplanting machine is composed of 3 or 4 set of device generally, completes three movements of taking seedlings, transporting and planting, but it has the deficiency of complex structure, high cost and low efficiency. In order to simplify the structure, Japan's vegetables pot seedling transplanting machine adopts two sets of institutions. It combines the seedling fetching device with conveying device as one, using a combination of rotary and slide mechanism to complete the complex movements of taking and deliverying seedlings. However, due to the addition of the slide mechanism, it greatly reduces the productivity, and the slide is easily worn after long hours of working. The working reliability can not be guaranteed. Transplanting machines in domestic application, most of them are semi automatic transplanting machines with low efficiency and high labor intensity. According to the above problems, an inverted vegetable pot seedling transplanting mechanism is proposed in this paper by using modified elliptical gear, cylindrical gear and conjugate cam as the transmission mechanism. The transplanting mechanism can meet the requirement for completing multiple actions by using a set of mechanisms, which simplifies the structure and improves the transplanting efficiency. The vegetable transplanting machine with this mechanism can reach the level of full automation and high efficiency. First of all, on the basis of analyzing the working principle of the transplanting mechanism, the kinematics model of the mechanism was established. Then an analysis and optimization software for the mechanism was developed with Visual Basic 6.0. Finally, a set of structural parameters were obtained by a human-interactive optimization method to meet the requirements of the vegetable pot seedling transplanting. 2D drawing and 3D model were established and imported to ADAMS (Automatic Dynamic Analysis of Mechanical Systems) for simulation. The simulation results were compared with that obtained by the optimization software, which validated the theoretical analysis. The study can provide a reference for designing the vegetable pot seedling transplanting mechanism.

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