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冷拔钢管根据工艺基础常用的四种测量方式

冷拔钢管依据厂家工艺小口径冷拔钢管要求的不同，有多种测长办法。主要有以下几种：一、光栅尺测长：基本原理是冷拔钢管两头外侧分别设置两个固定长度的光栅尺，使用无杆气缸带动光栅尺接近冷拔钢管两头，使用光的干涉现象完成对冷拔钢管长度的丈量。特点是准确度高。但光栅尺价格昂贵且保护困难，冷拔钢管对灰尘和场所振荡的影响很灵敏。

There are many methods for length measurement of cold-drawn steel pipe according to the different requirements of small-caliber cold-drawn steel pipe manufacturer. There are mainly the following kinds: 1. Grating ruler length measurement: the basic principle is to set two fixed length grating rulers on the outside of the two ends of cold-drawn steel pipe, use rodless cylinder to drive the grating ruler close to the two ends of cold-drawn steel pipe, and use light interference phenomenon to complete the measurement of the length of cold-drawn steel pipe. It is characterized by high accuracy. However, grating rulers are expensive and difficult to protect. Cold-drawn steel tubes are sensitive to dust and site oscillation. 二、编码器测长

2. Encoder Length Measurement

原理是油缸处装置编码器，使用油缸推进冷拔钢管在辊道上运动，另一侧装置等间隔的一系列光电开关，当冷拔冷拔钢管被油缸推进管端碰到光电开关时，从记载的编码器读数，换算出油缸的行程，这样能够计算出冷拔钢管的长度。

The principle is to install an encoder at the oil cylinder, which uses the oil cylinder to propel the cold-drawn steel pipe to move on the roller, and a series of photoelectric switches with equal intervals on the other side. When the cold-drawn steel pipe is touched by the photoelectric switch at the end of the oil cylinder, the distance of the oil cylinder can be calculated from the recorded encoder reading, so that the length of the cold-drawn steel pipe can be calculated.

特点是测长时需求将冷拔钢管升起。此外，光电开关检测也存在必定差错，可能需求充沛丈量。

The characteristic is that the cold-drawn steel pipe will be lifted up by the demand of measuring length. In addition, there are also certain errors in photoelectric switch detection, which may require abundant measurement.

三、摄像机测长。

3. Camera Length Measurement.

摄像机测长是使用图画处理完成冷拔钢管长度丈量，其原理是冷拔钢管输送辊道某一段上装置等间隔的一系列光电开厚壁冷拔钢管关，另一段上加光源和摄像机。当冷拔钢管经过这一区域时，能够依据某一处光电开关经过摄像机摄取图画在屏幕上的方位来断定冷拔钢管长度。

Camera length measurement is to measure the length of cold-drawn steel pipe by using picture processing. Its principle is that a series of photoelectric thick-wall cold-drawn steel pipe closures with equal intervals are installed on one section of the cold-drawn steel pipe conveying roller, and light source and camera are added to the other section. When the cold-drawn steel pipe passes through this area, the length of the cold-drawn steel pipe can be determined according to the orientation of a photoelectric switch passing through the camera and drawing on the screen.

特点是可完成在线丈量，冷拔钢管在经过测长区域时即可取得长度数据，无间隔。缺乏是假如不必特设光源照射，冷拔钢管就会遭到外界光的搅扰，而选用特设光源后因为冷拔钢管在倒棱后管端亮度高而对光线的反射很强，容20#冷拔钢管易形成读数差错。

The feature is that on-line measurement can be completed. Length data of cold-drawn steel pipe can be obtained without interval when it passes through the length measuring area. The lack is that if the special light source is not needed, the cold-drawn steel pipe will be disturbed by the external light. When the special light source is selected, the light will be reflected strongly because the brightness of the cold-drawn steel pipe is high at the end of the chamfered pipe. The 20 # cold-drawn steel pipe is easy to form reading errors.

四、改进型编码器测长

IV. Improved Encoder Length Measurement

这种办法是一种直接丈量办法，经过丈量冷拔钢管两个端面与各自基准点之间的间隔，直接测出冷拔钢管长度。冷拔钢管两头各设置1台测长小车，初始方位为零位，间隔为L然后移动编辑器长度到各自冷拔钢管管端的行走间隔(L2L3L-L2-L3即为冷拔钢管的长度。

This method is a direct measurement method. The length of cold-drawn steel pipe can be measured directly by measuring the distance between the two ends of cold-drawn steel pipe and their respective reference points. Each end of the cold-drawn steel tube is equipped with a length measuring trolley. The initial orientation is zero, the distance is L, and then the walking distance from the length of the editor to the end of the cold-drawn steel tube is moved (L2L3L-L2-L3 is the length of the cold-drawn steel tube).

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