Rice wide-and-narrow row spacing transplanting mechanism with planetary gear train composed of staggered helical gears and noncircular bevel gears

Abstract

The invention discloses a rice wide-and-narrow row spacing transplanting mechanism with a planetary gear train composed of staggered helical gears and special-shaped noncircular bevel gears. The present wide-and-narrow row spacing transplanting mechanism still has a very big improvement space in direct seedling taking when taking seedlings, and also has problems that seedling taking is not precise enough and seedlings fall easily. According to the invention, two sides of each center helical cylindrical gear are engaged with an upper middle helical cylindrical gear and a lower middle helical cylindrical gear respectively, each upper planetary special-shaped noncircular bevel gear is engaged with an upper middle special-shaped noncircular bevel gear, each lower planetary special-shaped noncircular bevel gear is engaged with a lower middle special-shaped noncircular bevel gear, all pitch curves of the upper middle special-shaped noncircular bevel gears and the lower middle special-shaped noncircular bevel gears include long convex spherical curve sections and short convex spherical curve sections, and all pitch curves of the upper planetary special-shaped noncircular bevel gears and the lower planetary special-shaped noncircular bevel gears include conjugate long convex spherical curve sections and conjugate short convex spherical curve sections. According to the rice wide-and-narrow row spacing transplanting mechanism, the special-shaped noncircular bevel gears are provided with complete tooth profiles and high intensity, the lateral deviation of seedling taking is smaller, and the seedlings erect better.

Description

technical field [0001] The invention belongs to the field of agricultural machinery, and in particular relates to a helical-tooth interlaced-special-shaped non-conical gear planetary system rice wide-narrow row splitting mechanism suitable for high-speed rice transplanter wide and narrow row rice transplanting requirements. Background technique [0002] Rice planting in my country has a tradition of intensive farming. Due to the resource conditions of a large number of people and little land, it is determined that rice planting in my country needs to be combined with my country's economic and technological conditions to take a standardized and low-cost development path. Mechanized planting will become another dominant technology for the future development of rice planting in my country. [0003] The row spacing of the rice seedlings transplanted by the rice transplanter implements a planting method of one wide and one narrow. This planting method uses the principle of crop m...

AI Technical Summary

Problems solved by technology

However, since the non-conical gears and planetary non-conical gears in this patent application are all non-conical gears in the general sense, except that the pitch curve is non-circular, the gear teeth are all conventional tooth shapes. Due to the tightness and convexity requirements of the planetary gear system and the limitation of the pressure angle of the gear teeth, the transmission ratio of the planetary gear train cannot be further improved. The effect of taking seedlings

When picking seedlings, it is not possible to take seedlings directly, which may cause problems such as inaccurate picking, large openings for transplanting seedlings, and easy to fall seedlings

[0005] The patent with application number 201310318310.3 discloses a wide-narrow-row splitting mechanism of special-shaped gears for high-speed rice transplanters, but the splitting mechanism does not fully disclose the design process of non-conical special-shaped gears and the parameter requirements that need to be met when taking seedlings directly. It is impossible to know from the patent literature how it meets the requirements of the seedling picking, transplanting trajectory and posture requirements of the seedling needle of the splitting mechanism

However, those skilled in the art can know from the accompanying drawings of this patent that in fact, the tooth profile of the non-conical special-shaped gear in the split-insertion mechanism is incomplete, and part of the tooth profile of the special-shaped tooth is directly replaced by a pitch curve. Such a special-shaped gear needs to be optimized There are many parameters, and the strength of the special-shaped teeth of the gear is very low, and it is easy to fail during work, which makes the reliability of the insertion mechanism low.

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