国内外功能比较全面的半自动CO_2气体保护焊送丝机中,都具有一种接触送丝功能,即焊丝的送进不受焊枪上开关的控制,而只靠焊丝能否与工件接触产生电弧电流来决定是否送丝。这种功能给焊接操作提供了较多的方便,而实现这一功能必不可少的控制元件之一,就是电流继电器。下面就我厂批量生产的送丝机中所应用的电流继电器,以及新设计的相应触发延时开关电路进行简要介绍。 1、电流继电器的结构与原理电流继电器结构如图1所示。焊接电缆穿过电流继电器中心孔,当焊丝与工件接触引燃 At home and abroad more comprehensive semi-automatic CO_2 gas shielded wire feeder, has a contact wire feeding function, that is, welding wire feed from the torch on the switch control, but only by the welding wire can contact with the workpiece arc current To decide whether to send wire. This function to the welding operation provides more convenient, and to achieve this function is an essential control element, is the current relay. The following on my factory mass production wire feeder used in the current relay, and the new design of the corresponding trigger delay switch circuit is briefly introduced. 1, the structure and principle of the current relay Current relay structure shown in Figure 1. Welding cable through the current relay center hole, when the wire contact with the workpiece ignition