SD输送机共包括三段：加料段、预热段、连接小车进料段。
T/SD Conveyor including 3 sections, which are charging section, preheating section, connecting car section.
铜线退火后发红：连续退火分三个段：预热段，工作段、冷却段。
After annealing copper red: continuous annealing three sections: preheating section, the work piece, cooling section.
预热段因线的长度比较长，温度不会超过250度，不至于让铜线变色的。
Preheating section for line length is longer, the temperature is not more than 250 degrees, and not let the discoloration of copper wire.
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