碩士 / 國立成功大學 / 機械工程學系 / 105 / Traditionally, a rapier type shuttleless loom usually uses a variable-pitch screw mechanism and a slider-crank mechanism to drive a gear-wheel to complete the motion of the weft insertion. However, if a designer needs to replace the screw or redesign the contour of the variable-pitch screw mechanism, it is expansive in design and manufacturing. In order to solve the shortcomings by using the variable-pitch screw mechanisms, this work uses a constant-pitch ball-screw mechanism combining with the design concept of variable input speed to make the ball-screw compound mechanism achieve the characteristic of variable output speed, which also meets the design requirements and constraints of the output motion of the weft insertion mechanism.
Firstly, the equations of kinematic and dynamic characteristics for the ball-screw compound mechanism are derived as the foundation of design. Then, considering the continuity of motion, Bezier curve is used as the input speed function for the ball-screw compound mechanism. Based on optimal design, a set of input speed curves which meet the design requirements and constraints of the weft insertion mechanism are designed. Furthermore, the commercial software ADAMS is used to simulate the kinematic and dynamic characteristics of the ball-screw compound mechanism. The results of the simulation confirm the correctness of the design concept. On top of that, the results of the experiment established in this study prove the possibility of using the variable input speed control on this mechanism. Finally, the study shows the feasibility of application of the variable-input speed ball-screw compound mechanism on a rapier type shuttleless loom, which can solve the disadvantages of variable pitch screw mechanism.
| Identifer | oai:union.ndltd.org:TW/105NCKU5489050 |
| Date | January 2017 |
| Creators | Dong-LongYe, 葉東龍 |
| Contributors | Hong-Sen Yan, 顏鴻森 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 114 |
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