How to measure oil casing?

The basic principle of grating ruler length measurement is to set two fixed length grating rulers on the outside of both ends of the pipe. A rodless cylinder is used to drive the grating ruler close to the ends of the stainless steel pipe, and the length of the oil casing is measured by the interference phenomenon of light. The characteristic is high accuracy. However, grating rulers are expensive and difficult to maintain, and are sensitive to dust and site vibrations.

Camera length measurement. Camera length measurement uses image processing to measure the length of stainless steel pipes. Its basic principle is to install a series of photoelectric switches at equal intervals on a certain section of the oil casing transport roller conveyor, and add a light source and camera to another section. When the pipe passes through this range, the length of the pipe can be determined based on the position of the image on the screen captured by the camera through a certain photoelectric switch. The characteristic is that online measurement can be completed. When the stainless steel pipe passes through the length measurement range, the length data can be obtained without any interval. The disadvantage is that if a light source is not used, the pipe will be interfered by external light. If a light source is used, the brightness of the pipe end after chamfering is high and the reflection of light is strong, which can easily lead to reading errors.

The basic principle of encoder length measurement is to install an encoder at the oil cylinder, use the oil cylinder to promote the movement of the pipe on the roller table, and install a series of photoelectric switches at equal intervals on the other side. When the pipe is pushed by the oil cylinder and encounters the photoelectric switch at the end of the pipe, the recorded code is recorded The meter reading is used to calculate the stroke of the oil cylinder, so that the length of the pipe can be calculated. The characteristic is that the pipe needs to be raised when measuring length. In addition, there are certain deviations in photoelectric switch detection, which may require adequate measurement. Improved encoder length measurement is an indirect measurement method that indirectly measures the length of the pipe by measuring the distance between the two end faces of the stainless steel pipe and their respective reference points. Set up a length-measuring trolley at each end of the pipe. The original position is zero and the interval is L. Then move the editor length to the walking distance of the respective pipe ends (L2L3L-L2-L3 is the length of the pipe.