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东风_4型内燃机车两端司机室都装有DJS—150型速度表。它们分别由装在前、后端转向架上的测速发电机供给电压信号。该测速装置的惯性故障之一是1端司机室速度表指示器的二极管经常击穿。此外,司机还反映,在运行中常常出现1端司机室速度表指针波动大,速度表容易损坏以及两端速度表指示不一致。据不完全统计,1979年,17台机车因测速装置故障碎修45台次。这些故障大多为整流二极管(2AP_(17))击穿所致。如2009机车,1979年1、2月份先后8次报修,后来虽换上2AP_(21)、2AP_(23)、2CP_(23)和2CP_(13)等各型二极管,故障率稍好,但不能根除。根据我们添乘所掌握的情况初步分析认为,这惯性故障与磁场削弱自动过渡系统有关。从电路图上可看出,自动过渡装置的三相交流电压信号与1端司机
Dongfeng _4 diesel locomotive at both ends of the driver’s room are equipped with DJS-150-type speedometer. They are supplied by the tacho-generator mounted on the front and rear bogies respectively. One of the inertial faults of the tachometer is that the diodes of the 1-terminal driver compartment speedometer indicator often breakdown. In addition, the driver also reflects the fact that the 1-terminal driver’s cab speedometer pointer frequently fluctuates during operation, the speedometer is easily damaged and the speedometer indicators on both ends are inconsistent. According to incomplete statistics, in 1979, 17 locomotives were scrapped and repaired 45 times due to the failure of the speed measuring device. These failures are mostly due to the breakdown of the rectifier diode (2AP_ (17)). Such as the 2009 locomotive, repair in January and February 1979 has 8 times, and later replaced with 2AP_ (21), 2AP_ (23), 2CP_ (23) and 2CP_ (13) and other types of diodes, the fault rate slightly better, but not eradicate. Based on the preliminary analysis of the situation we know, this inertial fault is related to the automatic field weakening system. It can be seen from the circuit diagram, the automatic transition device of three-phase AC voltage signal with a driver