直線式吹瓶機性能量測系統之規劃與建置

The planning and constraction of linear type Blow-Mode machine’s measurement system

曾宏偉(Hung-Wei Tseng)

指導教授 ： 謝龍昌

國立虎尾科技大學/工程學院/動力機械工程系機械與機電工程碩士班/碩士(2016年)

摘要

直線式吹瓶機之開關模動作為往復直線式，其輸出動力是凸輪經由馬達帶動旋轉，使從動件進行搖擺運動，並藉由連桿機構驅動兩側開關模進行往復直線運動，其中凸輪的運動特性會影響整體寶特瓶製程的穩定性。故本研究之目的在於建立一套直線式吹瓶機的動態量測系統，用來驗證凸輪從動件在與開關模的運動狀態(包括位移、速度及加速度的運動曲線)是否符合原設計之運動曲線，探討運動曲線的實驗值與理論值誤差的原因，找出造成誤差的關鍵因素、改善吹瓶機的動態特性及穩定度，提高吹瓶機的產能。
本研究於凸輪從動件輸出軸安置一旋轉編碼器(Encoder)，於開關模(輸出滑塊)安置一線性位置編碼器;用以量測凸輪從動件之角位移及開關模之線性位移，接著將所量測之角位移及位移數據進行差分計算，得到凸輪從動件與之角速度、角加速度以及開關模之速度、加速度的運動曲線圖形;並利用曲線擬合方法，進行多項式曲線擬合，並進行誤差分析。本研究所量測之凸輪從動件角的位移、角速度、角加速度之理論值與實驗值誤差分別為0.9%、1.82%、2.55%，開關模位移、速度、加速度實驗值與理論值誤差分別為0.2%、3.91%、0.72%；由實驗結果得知，實際運動特性值與理論值誤差很小、兩者相當確符合。

關鍵字

凸輪－連桿機構 ； 曲線擬合 ； 差分計算 ； 吹瓶機

並列摘要

The motion of open/close mode of linear type PET mode-blow machine is linear reciprocating motion. The motor drives gear reducer and cam system and let cam-follower has rotational reciprocating motion. Then, the open/close modes are driven by linkage mechanism to have linear reciprocating motion. The characteristics of cam system will affect the stability of the whole process of blowing PET bottles. The purpose of this study is to establish a measurement system for linear type PET mode-blow machine, used to verify the motion characteristics (including displacement, velocity and acceleration) of cam-follower and open/close mode whether meeting the original design. Discuss the reason of error between experimental and theoretical values, identify the key factors of causing errors, and improve the dynamic characteristics of the mode-blow machine.
In this study, the output shaft of cam-follower is arranged a rotary encoder and open/close mode is arranged a linear position encoder for measuring the displacement of the cam-follower and open/close mode. Then, the angular displacement of cam-follower and rotating displacement of open/close mode are measured and the corresponding velocity curve and acceleration curve are obtained by differential calculation. By curve fitting method, we can obtain the corresponding smooth curve of velocity and acceleration. According this curve fitting graphics, the errors between experimental and theoretical values are analyzed. The results of this study are: 1. For cam-follower, the errors of the theoretical and experimental values of angular displacement, velocity, and acceleration are 0.9%, 1.82%, 2.55%. 2. For open/close mode, its errors of the theoretical and experimental values of linear displacement, velocity, and acceleration are 0.2%, 3.91%, 0.72%. Based on the above results, we conclude that the errors between experimental and theoretical values are very small.

並列關鍵字

cam-linkage ； curve fitting method ； differential calculation ； mode-blow machine

參考文獻

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