How to accurately measure the length of spiral steel pipe is very important for
spiral steel pipe manufacturers. After years of production experience, four methods of testing length have been summed up:
1. Improved encoder length measurement: This method is an indirect measurement method, which indirectly measures the length of the steel pipe by measuring the distance between the two end faces of the steel pipe and their respective reference points. Set up a length-measuring trolley at both ends of the steel pipe, the initial position is zero, and the distance is L. Then move the length of the editor to the walking distance (L2, L3) of the respective steel pipe ends, L-L2-L3, which is the length of the steel pipe. This method is easy to operate, the measurement accuracy is within ±10mm, and the repeatability is less than or equal to 5mm.
2. Grating ruler length measurement: Two fixed-length grating rulers are installed on the outside of the two ends of the spiral steel pipe manufacturer, and the rodless cylinder is used to drive the grating ruler near the two ends of the steel pipe, and the measurement of the length of the steel pipe is realized by using the interference phenomenon of light.
3. Camera length measurement: Camera length measurement uses image processing to measure the length of steel pipes. The principle is to install a series of photoelectric switches at equal distances on a certain section of the steel pipe conveying roller table and add a light source and a camera to the other section. When the steel pipe passes through this area, the length of the steel pipe can be determined according to the position on the screen of the image captured by a certain photoelectric switch through the camera.
4. Encoder length measurement: The principle is to install an encoder at the oil cylinder. The spiral tube uses the oil cylinder to push the steel pipe to move on the roller table and installs a series of photoelectric switches at equal distances on the other side. When switching, the stroke of the oil cylinder is converted from the recorded encoder reading, so that the length of the steel pipe can be calculated.
