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How to measure the length of steel pipe?

DataTime:[2017-1-4]

How to measure the length of steel pipe?

According to the different requirements for the process, there are a variety of method of measuring the length of steel pipe following:


1, grating length measurement
The basic principle is: the outside of the pipe ends were set two fixed-length grating, rodless cylinder driven grating measurement of the length of pipe near the pipe ends by optical interference phenomenon. its characterized by high accuracy. Grating expensive and difficult to maintain, very sensitive to dust and venues vibration.

2, the camera length measurement.
The camera length measurement is the use of image processing steel tube length measurement, the principle is equidistant series of photoelectric switches installed in a section of the pipe conveyor roller, plus the light source and the camera on the other section. When the steel pipe after the region, according to a particular photoelectric switch through over cameras capture an image on the screen to determine the length of pipe. Can be achieved online measurement, pipe length data can be obtained through the length measurement area, no interval. If you do not have ad hoc light source, the steel pipe will be subject to interference from external light, and the adoption of ad hoc light steel pipe tube end chamfering high brightness of light reflected strong, likely to cause reading errors.

3, the encoder length measurement
Principle is installed in the cylinder at the encoder, the use of the cylinders to promote the movement of the pipe in rollers, equidistant series of photoelectric switches installed on the other side, when the steel pipe encountered cylinder promote the tube end when the photoelectric switch, the readings recorded from the encoder converted the stroke of cylinder, so that we can calculate the length of the tubes. Its characterized by the pipe length measurement rising. In addition, photoelectric switches detect some error, may need to be fully measured.

4, the improved encoder length measurement
This method is an indirect measurement, measured indirectly by measuring the distance between the two end faces of the steel pipe with the respective reference point, the length of pipe. Pipe ends each set 1 car length measurement, initial position zero bit, spacing of L. Then the Mobile Editor length to each steel pipe, tube ends walking distance (L2, L3), L-L2-L3 is the length of the tubes. This measurement is to overcome the large volume of steel pipe production complex environment of the scene, measuring mechanism can not pass through the lower part of the steel pipe support stand difficulties. This method is easy to operate, measurement accuracy within ± 10mm Repeat accuracy ≤ 5 mm.

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