plc控制龙门刨床.doc

摘 要 龙门刨床是工厂中常见的大型机械加工设备，老式的龙门刨床的主拖动采用交磁放大机-发电机-电动机（JF-D）调速系统，能量损耗高、噪声大。老式龙门刨床的电控部份采用继电器逻辑控制，线路复杂，故障率高，查找故障困难。 本论文在分析和研究龙门刨床(B2012A)原控制系统的基础上，设计了新的龙门刨床电控系统。 该系统以西门子公司的直流调速器(6RA70)为主要调速控制器件，根据主电机实际转速自动调节电枢电压和电流，平滑改变电动机转速。刨床各运动部件采PLC逻辑控制，根据工艺要求可实现各部分单独运动及联动。以可编程控制器检测速度过零为换向条件，实现了工作台的无冲击换向。从根本上克服了龙门刨床换向冲击大、工作效率不高、耗电量大等一系列缺点。论文详细地给出了整个系统电路(包括电机拖动电路、直流调速系统电路及逻辑控制电路)的设计过程和工作原理。 本系统直观性好，控制安全可靠，运行平稳，调速精度高，具有其他龙门刨床控制系统所没有的若干优点，且经济实用，具有广阔的应用前景。 关键词:龙门刨床 PLC控制 直流调速 Abstract Planer is common in large-scale factory machining equipment, the old main drag planer magnetic amplifier using AC - Generators - Motors (JF-D) speed control system, high energy consumption, noise big. Old planer electronic control part of the relay logic control circuit complexity, high failure rate, difficult to find fault. In this thesis, analysis and research planer (B2012A) based on the original control system, designed a new electronic control system Planer. The system Siemens DC Driver (6RA70) as the main speed control device, according to the actual speed automatic adjustment of the main motor armature voltage and current, smooth changes in motor speed. Planer PLC logic of the moving parts of the mining control, according to process requirements to achieve separately the various parts of movement and interaction. Programmable controller detects the speed to zero for the change to the conditions for the realization of the table without the impact of the commutation. Papers presented in detail the entire system circuit (including motor drag circuit, the circuit and DC speed control system logic control circuit) design process and work. This system is intuitive and good control of safe, reliable, smooth running, speed, high precision, with other control systems Planer several advantages not available, and economical and practical, has broad application prospects. Keywords: double housing Planer PLC controlling direct Currentspeed regulating 目 录 第 1章 概 述 1 1.