1. Measure the length of the grating ruler
The basic principle is that the two fixed -length grating ruler is installed on the outer side of the two ends of the straight steel pipe. The grating ruler is driven by a pillar near the ends near the steel pipe.
Having high accuracy. However, the price of the grating ruler is expensive and difficult to maintain, so it is sensitive to the effects of dust and on -site vibration.
2. Speed camera test
Camera length measurement is measured by image processing through image processing. The principle is to install a series of equivalence of photoelectric switches in a section of the straight steel pipe conveyor roller, and add light sources and cameras in another section. When the steel pipe is passed through this area, the length of the steel pipe can be determined according to the position of the image taken on the screen according to the position of the camera on the screen.
It is characterized by online measurement and long data when the steel pipe is not intervals through the measurement area.
3. Coder length measurement
The principle is to install the encoder on the cylinder, use the cylinder to drive the steel pipe to move on the drum, and install a series of equal -distance photoelectric switches on the other side. When the steel pipe is touched by the photoelectric switch at the end of the cylinder, the schedule of the cylinder can be converted from the recorded number of the coder to calculate the length of the steel pipe.
It is characterized by the steel pipe that needs to be lifted when measured. In addition, there are some errors in the photoelectric switch detection, which may need to be measured.
4. The improvement of the improved encoder
This method is an indirect measurement method. By measuring the distance between the two ends of the steel pipe and the respective reference points, the length of the steel pipe can be indirectly measured. A length measurement vehicle is set at both ends of the steel pipe. The initial location is zero and the spacing is L. Then move the length of the editor to the walking distance (L2, L3) of one end of each steel pipe, that is, the length of the steel pipe, the length of the steel pipe.
This measurement method has overcome difficulties such as large steel pipe volume, complex environmental environment, and the measurement mechanism cannot cross the lower sideline support. It is convenient to operate. The measurement accuracy is less than ± 10 mm, and the duplicate accuracy is ≤5mm.
