灌浆自动记录系统打印功能的实现

来源期刊：中南大学学报(自然科学版)2004年第6期

论文作者：彭环云 张可能 徐力生

文章页码：1004 - 1008

关键词：灌浆自动记录系统;热敏打印机;单片机

Key words：grout-recording system; thermal printer; microcontroller

摘    要：通过分析比较,采用日本精工公司生产的LTP2442热敏行式打印头,设计了热敏行式打印机;以80C51单片机为核心,通过总线扩展技术扩展了1片数据存储器和2片程序存储器,用1片8255可编程并行I/O扩展接口扩展了3个可编程并行I/O端口;应用80C51单片机汇编语言编写控制软件,采用模块式设计方法,将控制程序分解成各个子程序进行编程;针对热敏头温度异常问题,设计了温度检测外围电路,分析了常能量控制问题,提出了打印时施加给每一个发热元件的能量计算公式;通过分析打印时大电流脉冲问题,提出了分段驱动发热元件以降低峰值电流的方法。实验结果表明,由于取消了热敏头的左右移动工作方式,只需采用1个电机驱动,新型热敏行式打印机的使用寿命可达50 km,打印速度可达75 mm/s。

Abstract: Based on the analytic results, LTP2442 TPH(thermal printer head) of the Seiko Instruments Inc in Japan is selected in the design of the new thermal line printer. The system has microcontroller(MPU) 80C51 as the core, expanding a data memory and two program memories by BUS and three parallel programmable I/O ports by the programmable parallel port chip 8255. The software is written by 80C51 compilation language and is divided into many child programs according to model design principal. A temperature monitoring periphery circuit is designed tomonitor the temperature of TPH, which can help TPH avoid being broken because of high temperature caused by the current exerted to TPH. A formation of calculating the energy, which should be exerted to a heat element each time, is presented to keep the energy of each working heat element in constant. To cut down the peak current, divided activation of the heat elements is designed. The experiment results show that, because TPH doesn’t need move from left to right as the traditional thermal printer did any more, the new thermal line printer is more permanent, the maximum print speed can reach 75 mm/s and life span of abrasion resistance can be 50 km or more.