The Design Method of the Seedling Picking Mechanism of the Planetary Gear Train Driven by Secondary Unequal Amplitude Noncircular Gears
A technology of non-circular gears and planetary gear trains, applied in transmission devices, planting methods, mechanical equipment, etc., can solve the problems of failure to consider the posture requirements of the transplanting arm, failure to form non-circular gear pairs, and great influence on the success rate of seedling picking. question
Active Publication Date: 2020-07-14
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology
This "reverse design" method seems simple, but if the trajectory is complex, the total transmission ratio of the planetary gear train obtained by reverse calculation will often have excessively large values, too small values, and excessive fluctuations, etc., directly resulting in the inability to form a two-stage usable non-circular gear pair
Moreover, the above-mentioned inverse design method is only for the research on the trajectory of seedling picking, without considering the attitude requirements of the transplanting arm. In fact, the attitude of the transplanting arm in the two stages of seedling picking and seedling throwing has a great influence on the success rate of seedling picking.
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[0099] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0100] The design method of the seedling picking mechanism of the secondary unequal amplitude non-circular gear transmission planetary gear train, the specific steps are as follows:
[0101] Step 1, such as figure 1 , according to the seedling picking requirements, determine the coordinates of five key points of the seedling picking track 7 and the attitude angle of the seedling needle at each key point, and the attitude angle of the seedling needle is the angle between the seedling needle and the horizontal plane.
[0102] Seedling trajectory analysis:
[0103] The automatic transplanting machine requires the seedling taking mechanism to simulate the human hand to take out the pot seedlings from the pot seedling tray, and then release them at a certain position so that the pot seedlings fall into the seedling planter; by analyzing the trajectory chara...
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The invention discloses a design method of a seedling taking mechanism of a secondary unequal-amplitude non-circular gear transmission planetary gear train. The situations of too high values, too small values, too large fluctuation and the like frequently happen to the total transmission ratio, obtained through reverse engineering at present, of the planetary gear train, and the posture requirements of transplanting arms are not considered. Based on given ideal seedling tracks, key point positions and seedling needle posture angel requirements, a plane model of a two-rod mechanism is set up, the rod length and rotating center of a connecting rod are obtained by solving the model, reasonable solutions are screened, data values are optimized, and the total transmission ratio is calculated bycombining the ideal seedling tracks; and the connecting rod of two degrees of freedom is reduced into one degree of freedom, the two-stage gear planetary gear train is used as a drive part for connecting rod motion, two stages of transmission ratios are distributed, and therefore the seedling taking mechanism of the secondary unequal-amplitude non-circular gear transmission planetary gear train is obtained. Transmission of the planetary gear train is more stable, and the accuracy and reliability of the designed seedling taking mechanism are both high.
Description
technical field [0001] The invention relates to a gear design method, in particular to a design method for a seedling picking mechanism of a secondary non-circular gear transmission planetary gear train. Background technique [0002] Seedling transplanting is an important link in the vegetable production process, and more than 60% of vegetable varieties adopt the seedling cultivation method. Compared with manual transplanting, mechanical transplanting using a transplanter is more efficient and more practical. The core working parts of the automatic vegetable transplanter are mainly composed of a seedling picking mechanism and a seedling planting mechanism. The operation from seedling picking to seedling planting is performed by machinery. Automatically, compared with the semi-automatic transplanting machine with only a seedling planting mechanism, it improves work efficiency and reduces the rate of missing seedlings. The seedling picking mechanism is a symbol of automatic t...
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IPC IPC(8): F16H37/12A01C11/02G06F30/17G06F30/20
Inventor 童志鹏俞高红刘朋飞黄佳辉李祥
Owner ZHEJIANG SCI-TECH UNIV