摘要由于锚链形状比较特殊，且拉力机的现场工作环境较差，所以一般的测量方法很难满足要求且效率不高。目前，国内锚链生产厂家在拉力试验过程中进行五环长度测量大都使用超长游标卡尺由人工进行测量，这不仅测量结果精度低，而且费时、费力，还很不安全。51267

为了更加准确而快捷的测量出锚链的长度，本文设计了一种新的测量锚链长度的方法。我们先是用伺服电机驱动拉力机拉紧锚链，然后用步进电机来驱动小车沿着锚链方向来运动。在小车上带有三个传感器，分别是一个位移传感器和两个激光传感器。激光传感器主要是用来检测到锚链各环的环冠顶点，而位移传感器主要是用来记录锚链各环的环冠顶点的位置值，为接下来的计算准备好数据。激光传感器把所测得数据再传给数据采集卡，通过数据采集卡传给计算机。最后计算机再根据所测得数据，调用VB.net编好的算法程序来计算该锚链的长度是否合格，从而完成测量锚链长度的目的。

毕业论文关键词：锚链五环长；激光传感器；位移传感器；数据采集卡；VB.net

Abstract As anchor shape is rather special, and the Rally of the field work environment is poor, it is generally difficult to meet the requirements of measurement methods and efficiency is not high. Currently, the domestic chain manufacturers in the tensile test carried out during long rings length measurement using a vernier caliper mostly measured by hand, not only low precision measurements and time-consuming, laborious, very unsafe.

To be more accurate and fast measurement of the length of anchor chain, we designed a new method for measuring the length of the chain. We begin with a servo motor drive chain tension testing machine, and then use the stepper motor to drive the car moving along the chain direction. In a small car with three sensors, namely, a displacement sensor and two laser sensors. Laser sensors are used to detect the anchor crown rings each ring vertices and displacement sensors are used to record the crown anchor ring each ring vertex position value calculated for the next data is ready. Laser sensor to the measured data is then passed to the data acquisition card, passed to the computer through a data acquisition card. Finally the computer according to the measured data, calling VB.net programmed algorithm to calculate the length of the chain is qualified， Thus completing the chain length measurement purposes.

Keywords: Anchor chain rings long ; Laser Sensor; Displacement sensor; Data acquisition card; VB.net

目  录

第一章 绪论 1

1.1研究背景 1

1.2国内外研究现状 1

1.3本文主要内容 1

第二章 系统总体设计方案 3

2.1现有测量方案介绍 3

2.2本设计测量方案介绍 3

2.3本章小结 4

第三章硬件电路设计 5

3.2元器件选型 5

3.2.1 步进电机选型 6

3.2.2激光传感器选型 8

3.2.3 位移传感器选型 9

3.3步进电机控制 10

3.3.1数据采集卡选型 11

3.3.2 步进电机的控制电路 13

3.4传感器控制 14