基于PLC的生产线输送带控制系统设计

摘要

目前，输送带系统在工业的各个领域有着广泛的应用。其结构简单、运行平稳、运转可靠、能耗低、对环境污染小、便于集中控制和实现自动化、管理维护方便，在连续装载条件下可实现连续运输。对于输送带的控制，它的控制形式也多种多样，它可以由单片机，PLC，以及计算机来控制，以前都采用接触继电器控制系统。而接触继电器控制系统接线复杂、抗干扰能力差，易因接触不良而造成故障，而且功能扩展性差。PLC 因其可靠性高、功能完善而越来越受到企业的青睐，传统的接触继电器控制系统已逐步为PLC所取代。

根据所学知识和文献资料对基于PLC的生产线输送带控制系统设计所采用的方法是PLC集中控制的办法，利用PLC内部存储来执行逻辑运算、顺序控制、定时、计数和算术运算等操作，并采用数字量，模拟量的输入和输出来完成控制过程，从而实现对传送带的智能控制。而且PLC能把计算机的许多功能和继电控制系统结合起来，使PLC和组态控制软件的联系更加紧密，使其模拟量控制、位置控制控制等使其远程通信功能更加完善。因此本次设计选择了用PLC来控制输送带的整个运行过程，利用PLC简单可视化的程序，实现自动控制的目的。PLC的运用使得系统的电路变得简明清楚，而且十分便于日后的运行维护带式输送机。

关键词：PLC；输送带；集中控制

Design Of The Conveyor Belt Control System For Production line

Based on PLC

Abstract

At present, belt conveyor system in the industrial areas in which there is a wide range of applications. Its simple structure, smooth running, run reliable, low energy consumption and environmental pollution on small, easy to focus on control and automation, and ease of maintenance, and management in a continuous load conditions for transport. Conveyor belt for the control, it has a variety of forms of control, it can be done by single-chip Phone, as well as computer, PLC, have in the past to control relay control system with touch. Contact with relay control system wiring complex, anti-interference ability is poor, vulnerable to failure and poor contact, and scalability. PLC due to its high reliability, and functionality has been more and more enterprises, traditional contact relay control system has been replaced by PLC for step-by-step.

Based on the knowledge-based information and documentation of PLC conveyor belt production line control system design is the method used by the centralized control PLC approaches, using PLC internal storage to perform logical operations, sequence control, timer, counting and arithmetic operations, such as volume, and adopts the digital, and analog input and output to complete control over the process, the conveyor belt of intelligent control. But PLC to many of the features of the computer and relay control systems into one, so that group mentality and PLC control software, and more closely connected to the analog control, position control, and control their remote communication is much more refined. Therefore this design choice PLC to control the use of the conveyor belt, used during the entire run PLC simple visualization of the process, the automatic control. Use the PLC The circuit makes the system more concise clear and 10 for easy future maintenance of the running belt conveyor.

Keywords: PLC; conveyor belt; centralized control

目录

1 引言 (1)

1.1 设计目的和意义 (1)

1.2 国内外带式输送机技术现状及差距 (2)

1.2.1 大型带式输送机的关键核心技术上的差距 (3)

1.2.2 技术性能上差距 (4)

1.2.3 控制系统上差距 (5)

1.3 本文所做的工作 (5)

2 基于PLC的生产线输送带控制系统方案设计 (6)

2.1 胶带运输机 (6)

2.1.1 胶带运输机的类型及适用条件 (6)

2.1.2 胶带运输机结构 (6)

2.2 方案比较 (7)

2.3 方案确定 (8)

2.3.1 设计任务 (9)

2.3.2 系统设计思路 (10)

3 基于PLC的生产线输送带控制系统硬件设计及选型 (12)

3.1 可编程控制器PLC的选型 (12)

3.1.1 PLC的组成结构 (12)

3.1.2 PLC的工作原理 (13)

3.1.3 机型的选择 (16)

3.1.4 Siemens S7-200 介绍 (17)

3.1.5 本设计的PLC配置 (18)

3.1.5 本设计PLC的I/O配置及外围电路设计 (20)

3.2 传感器选型 (22)

3.2.1 光电传感器 (22)

3.2.2 称重传感器 (22)

3.2.2 跑偏开关 (24)

3.3 被控装置的选择 (26)

3.3.1 传送带电机 (26)

3.3.2 电动推杆 (27)

3.3.3 液压推杆 (29)

3.3.4 滚筒电机 (30)

4 基于PLC生产线输送带控制系统软件设计 (31)

4.1 PLC程序设计 (31)

4.1.1 编程软件介绍(STEP7 Micro/WIN) (31)

4.1.2 软件编程分析及编程 (32)

4.1.3 PLC编程 (32)