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  rack
Based on the research, the kinematics graphic simulation of spherical gear mechanism and disk rack are made respectively.
      
Vertebrate RACK1 plays a key role in embryonic development.
      
This paper described the cloning, phylogenetic analysis and developmental expression of AmphiRACK1, the RACK1 homologous gene in amphioxus.
      
Phylogenetic analysis indicated that amphioxus RACK1 was located at the base of vertebrate clade.
      
Structure analysis of locking mechanism of gear-rack typed ship-lift
      
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  rack
Based on the research, the kinematics graphic simulation of spherical gear mechanism and disk rack are made respectively.
      
Vertebrate RACK1 plays a key role in embryonic development.
      
This paper described the cloning, phylogenetic analysis and developmental expression of AmphiRACK1, the RACK1 homologous gene in amphioxus.
      
Phylogenetic analysis indicated that amphioxus RACK1 was located at the base of vertebrate clade.
      
Structure analysis of locking mechanism of gear-rack typed ship-lift
      
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Utilizing atmospheric pressure as power the authors put forward a driving mouldboard two-way plow reversing in left and right with blind plough furrow, replacing the common hydraulic system in internal and external type. Through mechanical tests and analyses, it showed the simplicity of structure with lower cost and higher applicability.

利用气压作动力,选用双向齿轮齿条传动活塞气缸,驱动铧式双向犁左右翻转,完成闭垄耕作,可替代国内外双向犁上常用的液压翻转装置。通过设计、受力分析,引用函数逼近法找出了气动背压机构的最佳参数。实验表明,其性能指标均达到国家有关标准要求,且结构和制造工艺简化,生产成本降低,增加了农用拖拉机的适用性。

Raising rice seedlings by air-pruning method and the sequential transplanting scheme of air-pruning seedling, extracting and launching seedlings by air sucking method were put forward. The experiment shows that the tray rice seedlings raised by air-pruning have many advantages. Because the seedling root system spreads all over the room, its biological characteristics are better than the conventionally raised seedlings so that it is not easily be cracked or lodged during transplanting. Seedlings can be easily...

Raising rice seedlings by air-pruning method and the sequential transplanting scheme of air-pruning seedling, extracting and launching seedlings by air sucking method were put forward. The experiment shows that the tray rice seedlings raised by air-pruning have many advantages. Because the seedling root system spreads all over the room, its biological characteristics are better than the conventionally raised seedlings so that it is not easily be cracked or lodged during transplanting. Seedlings can be easily extracted from the bottom of the air-pruning pot tray so that they can be transplanted sequentially with no damage. This paper also discussed the overall scheme, lateral and longitudinal bed shifting mechanism and the seedling dropping mechanism of the transplanter. The singlechip controlling system includes gear & rack mechanism and crank & rocker mechanism driven by step motor and the electromagnet. The gear & rack mechanism can be used to control the lateral and longitudinal shifting of seedling bed. The crank & rocker mechanism can be used to control opening and closing of the seedling-launching valve. And the seedling-launching valve of the seedling guiding tube was controlled by the electromagnet. Test shows that the singlechip controlling system can be used to shift the seedling bed, open and close the dropping valve and shift the seedlings on schedule, which meets the agricultural requirements of rice sequential transplanting.

采用空气整根育秧技术对水稻钵苗进行育秧试验 ,提出了水稻钵苗空气整根育秧、气吸取苗和投苗的有序移栽方案。试验结果表明 ,采用空气整根培育钵苗 ,根系遍布整个钵腔 ,生物学特性优于常规钵育秧 ,且移栽时钵体不易破碎和倒伏。采用空气整根钵盘 ,以较小的吸力 ,钵苗就可从钵腔底部取出 ,实现不伤苗和根的钵苗有序移栽。对气吸式水稻钵苗有序移栽机的总体方案设计、横纵向移箱装置、投苗装置进行了分析和研究 ,研制了样机。试验结果表明 ,由步进电机驱动齿轮齿条机构控制横纵向送秧箱 ,驱动曲柄摆杆机构控制吸气活门 ,由电磁铁控制导苗管投苗活门的单片机控制系统能够按时按序完成移箱、活门开启和关闭 ,实现投苗和送秧 ,满足水稻有序移栽农艺要求。

According to the actual problem that the upward inclination angle of the big wing of the domestic KT-1 earth pushing plough is too small to raze the high kinetic line of stope,the vertical inclination angle control mechanism(the assembly drawing of the inclining cylinder) of the big wing is analyzed in detail.The modification scheme of shortening the rack by 174mm is proposed while keeping the inclining cylinder in its initial position.The upward inclination angle of the big wing is increased by 30 after the...

According to the actual problem that the upward inclination angle of the big wing of the domestic KT-1 earth pushing plough is too small to raze the high kinetic line of stope,the vertical inclination angle control mechanism(the assembly drawing of the inclining cylinder) of the big wing is analyzed in detail.The modification scheme of shortening the rack by 174mm is proposed while keeping the inclining cylinder in its initial position.The upward inclination angle of the big wing is increased by 30 after the modification and it suits the requirements of the stope.

根据国产KT-1型平土犁大翅向上倾角偏小不能刮出活动排岩线需要的超高这一实际难题,详细分析了大翅纵向倾角的操纵机构———大翅倾斜风缸装配图,提出在保持原倾斜风缸装配位置的前提下,缩短齿条174 mm的改造方案,使改造后平土犁的大翅向上倾角提高3°,以适应采场的需要。

 
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