摘要
为了满足管道焊接焊接的小型化,高效化。本文首先介绍了焊接电源“数字化”的概念,然后结合当前数字化管道焊接电源的国内外发展形势,针对数字信号处理技术的特点,阐明了进行本课题研究的必要性。
本文简要介绍了数字信号处理器DSP的工作原理、特点以及芯片的选择。重点介绍了所研制的数字化管道焊接逆变弧焊电源的组成结构和控制原理。分别就逆变焊机的主电路、PWM控制电路、保护电路、驱动电路以及送丝电路做了详细地分析,并从软、硬件两个方面进行了系统地阐述。
管道焊接分为纤维素下向焊和半自动药芯焊,本文详细介绍了纤维素下向焊与半自动药芯焊的工艺特点。纤维素下向焊采用恒流的控制方法。半自动药芯焊采用恒压的控制方法
焊机的主电路和控制电路部分都进行了可靠性和抗干扰设计。系统软件采用C语言,以模块化方法设计。文中详细说明了模块化程序设计的方法,介绍了主程序和子程序的功能和结构。
通过试验,对该电源的实现方案、组成部分进行了分析,得到了初步的试验结果,给出了在试验过程中记录的相关数据与波形;对试验过程中出现的问题进行研究分析,提出了解决方法。试验结果表明:该焊机主电路响应速度快,硬件电路简单可靠,系统软件高效、移植性好,抗干扰能力强,基本达到了最初设计的构想和要求。
In order to content the request of the mimiaturization and high electronic efficiency. According to the characteristics of digital signal processing, the digitalization of welding inverter and its future development on the basis of illumination of the DSP's basic characteristics are introduced. At the same time aiming at current research status, the paper discusses the necessary of this investigation.
Firstly, the control principle, characteristics and chip selection of DSP are introduced in the paper. The paper focuses on component part and control principle of digital piple welding inverter power. Main circuit, control circuit, pulse width modulation (PWM circuit), drive circuit and wire feeding circuit are respectively analyzed. Furthermore, the software and hardware aspects are also addressed.
Pipeline welding can be devided into two kinds. One is cellulose downward welding, the other one is flux-cored electrode. The technics characteristic is introduced particularly in this paper. Cellulose downward welding is controled by the way of constant current. flux-cored electrode welding is controled by the way of constant voltage.
Reliability and anti-amming are considered in main circuit and control circuit. System software, which is made of modular subroutines, is very efficient for limiting noise and improving system response-speed.
Corresponding data and waveforms are recorded, and problems occurred in experiment are investigated. The experiment results verify that the inverter power source has rapid response-speed, high reliability, a strong ability of anti-amming and good human-computer interface.
引文
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