CO2激光器总线式控制系统设计毕业论文

 2021-04-07 11:04

摘 要

随着我国的工业化生产规模的不断扩大,CO2激光器系统实行对监控的变量和待处理的数据量越来越大,对激光器的实时性和精度要求以及对系统的集成化程度的要求也越来越高。本课题主要在原有的CO2激光器的基础上,重新对CO2激光器进行设计。通过分析当前CO2激光器系统控制的不足之处,提出了基于DSP的CO2激光器总线式新型控制系统。这个新型控制系统大大降低了成本,提高了控制速度,并且能够使通信更加可靠。通过CANBUS总线将激光器的主控板,下位机和恒流开关电源链接起来。本设计使激光器的各部分共用一条总线进行通信,从而使通信更加简洁明了和可靠,也便于CO2激光器与数控机床和触控屏之间的通信。具体分为以下两个部分:

下位机的硬件设计:采用了DSPIC33EP256MV806芯片,通过A/D变换对气压和功率测量进行控制,通过485对真空泵进行控制,通过D/A变换对比例阀进行控制,通过I/O电路对温度和电磁阀进行控制。并监测和显示激光器的工作状态,以及对各种报警信号的处理。

下位机的软件设计:通过I/O口来对激光器进行工作流程的控制;并读取传感器的信息以及对报警信号的处理;通过Modbus协议控制两个泵的启停和转速的大小。

关键字:CO2激光器 DSPIC CAN 激光器控制系统

CO2 laser bus type control system design based on DSP

ABSTRACT

With the continuous expansion of China's industrial production, CO2 laser system to monitor the variables and the amount of data to be processed is more and more big, the real-time and accuracy requirements of laser and the integration degree of requirements of the system is also more and more high. This topic is mainly on the basis of the original CO2 laser, CO2 laser was designed to. By analyzing the deficiency of the current control CO2 laser system, puts forward the new control system based on DSP of CO2 laser bus type. The new control system greatly reduces the cost, improve the control speed, and can make communication more reliable. Through CANBUS bus will laser main control board, the next bit machine and switch power supply with constant current link. This design makes the laser parts Shared a bus for communication, making communication more simple and reliable, also facilitate CO2 laser and the communication between nc machine tools and touch screen. Concrete is divided into the following two parts:

Lowermachine hardware design: adopt DSPIC33EP256MV806 chips, by A/D transformation to control pressure and power measurement, by 485 to control of vacuum pump, through D/A transformation of proportional valve control, through the I/O circuit to control the temperature and electromagnetic valve. And monitor and display the working state of the laser, and the processing of various kinds of alarm signals.

Machine's software design: through the I/O port to control the working process of laser; And reads the sensor information and the alarm signal processing; Through the Modbus protocol control the size of the two pump start-up and speed.

Key words: CO2 laser DSPIC CAN laser control system

目 录

1. 绪论………………………………………………………………………………………1

1.1课题研究的背景 ……………………………………………………………………....... 1

1.2国内外发展状况及趋势…………………………………………………………………..2

1.2.1国内外状况……………………………………………………………………....2

1.2.2 发展趋势……………………………………………………...............................3

1.2.3 本课题的研究目的及意义……………………………………………………...3

1.3 本章总结………………………….....................................................................................4

2. CO2激光器……………………………………………………………………...........................5

2.1 CO2激光器结构……………………………………………………………………..........5

2.2 主电路…………………………………………………………………….........................6

2.3 气体单元…………………………………………………………………….....................7

2.4 输入和输出…………………………………………………………………….................9

2.5 本章总结………………………………...........................................................................10

  1. CO2激光器控制系统的整体设计方案………………………………………………………11

3.1 激光器的输入量和输出量……………………………………………………………...11

3.2 设计方案的系统框图…………………………………………………………………...12

3.3 本课题的主要工作……………………………………………………………………...13

3.4 本章总结………………………………...........................................................................13

  1. 激光器控制系统下位机硬件设计…………………………………………………………....14

4.1 电路板供电……………………………………………………………………...............14

4.2 主控芯片选择……………………………………………………………………...........16

4.3 隔离的 I/O 口…………………………………………………………………….........17

4.4 气压测量……………………………………………………………………...................20

4.5 485 通信……………………………………………………………………...................22

4.6 CAN 通信……………………………………………………………………...................22

4.7 功率测量……………………………………………………………………...................23

4.8 PCB 布板……………………………………………………………………...................23

4.9 本章总结………………………………...........................................................................24

5. 控制系统的软件设计…………………………………………………………………….....25

5.1 激光器的工作流程…………………………………………………………………….25

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