Wide Application of Large Diameter Caliper in Large Diameter Pipe Rolling

As a fully automatic non-contact measuring tool for the outer diameter of large-diameter pipes, the large-diameter caliper has always been the choice of enterprises that have difficulty in measuring the outer diameter of seamless steel pipes and spiral welded pipes. Especially in industrial automation. Take the diameter measurement process in steel rolling mills as an example. In order to ensure the quality of pipe products, the quality inspection department must measure the outer diameter of the product in real time.

Meter rulers or calipers are generally used for measurement, the speed is slow, and the measurement values often have deviations and errors, and only sampling inspections can be performed on the products. It is difficult to guarantee the quality of rolled steel products. This was once a difficult problem in the quality control of steel rolling processes. However, technology is developing and times are advancing, and the high-precision large-diameter caliper has fundamentally solved this problem.

At present, the caliper developed by technical engineers has been widely used in large-diameter pipe rolling, and the operation effect is good. This kind of caliper not only has good external hardware, but also has very stable software and comprehensive display data.

The photoelectric caliper is a device that uses a double-lens photoelectric measuring head to measure the outer diameter. The double-lens tube photoelectric measuring head is composed of two sets of transmitting lenses and two sets of receiving lenses. It uses LED clean light source and CCD imaging method to measure geometric dimensions. The basic measurement principle is shown in the figure below:

In the figure, two sets of transmitting lenses respectively emit parallel light to two sets of receiving lenses, and the parallel light beams are imaged on the photoelectric conversion elements through the lenses in the receiving lenses. When the object under test is put into the two beams of parallel light, a virtual shadow will appear on the image of the photoelectric conversion element, and its width is set to be L1 and L2 respectively. After processing and calculating the electrical signal sent by the photoelectric conversion element, the dimensions A1 and A2 corresponding to L1 and L2 can be obtained. A1 plus A2 plus the clear distance B between the two lenses can be used to obtain the measured object. Dimension D.

In practical applications, the net distance B of the probe is the size obtained by calibration with a fixed-length standard ruler. When the distance between the probes is changed, use the corresponding standard ruler to calibrate again to measure the outer diameter of different specifications. Yes. , it can also adjust the distance between the probes at any time to deal with the detection of pipe sizes with different calibers.

Calipers have the following features:

The response speed is fast, the real-time performance is good, and the measurement frequency is 500 Hz.

No wear and long service life. The service life of the whole set of equipment is not less than eight years.

Full digital system, easy to use.

Easy to operate and easy to maintain. Routine maintenance only requires wiping the lens.

Real-time outer diameter data display, equipped with intelligent measurement software system to complete the summary of various information.

If it is necessary to measure the ellipticity size, a large-diameter caliper with double measuring heads can be used. If the pipe is moving while rotating, a single measuring head can complete the detection of ellipticity.

Alarm function, sound and light alarm when the measurement data is out of tolerance.

The diameter measuring instrument has a wide range of applications, especially the application of diameter measuring technology in industries such as seamless steel pipes, spiral welded pipes, metallurgical automatic control, and precision equipment manufacturing.

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