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在机械加工中,汽车生产以连续、高效、批量为特征。因此,汽车生产设备中高效的自动半自动机床、组合机和自动线占有很大的比例,其中液压传动又占三分之二以上。传统的继电接触器控制系统,对于较复杂的设备,继电器达几十个之多。由于其有触点系统的固有特性,所以故障率较高,维修不便,维修费用高。这些设备大部分已投运十多年,急待进行技术改造。另一方面,随着微电子技术的发展,微处理机的价格日
In machining, car production is characterized by continuous, efficient and batch. Therefore, automotive production equipment in the highly efficient automatic semi-automatic machine tools, mixers and automatic lines occupy a large proportion, of which more than two-thirds of hydraulic transmission. The traditional relay contactor control system, for more complex equipment, relays up to dozens of. Due to its inherent nature of the contact system, high failure rates, inconvenient maintenance, and high maintenance costs. Most of these devices have been put into operation for more than 10 years and are in urgent need of technological transformation. On the other hand, with the development of microelectronics technology, the microprocessor price day