The nominal diameter is more than 200mm, which is the large diameter. At present, the main production process of China is large-diameter steel pipe. The main production process is hot-rolled large-diameter seamless steel pipe and hot-expanded seamless steel pipe. The hot-expanded seamless steel pipe can produce non-national standard size and heat expansion seamlessly. The tube is a heat-expanding tube that we often say, and the steel tube with a relatively low density but a strong shrinkage is a rough-rolling finishing process that expands the diameter of the tube by a cross-rolling method or a drawing method. Most of the enterprises are now transforming into automation, and the automatic caliper is now measuring small and medium-diameter rolled materials. For large diameters, it is impossible to measure. For this reason, we have developed and produced large diameter automatic calipers.
1, the principle of measurement
As shown in the above figure, the method used by the large diameter caliper is to measure the outer diameter of the outer diameter by using the adjustable double probe technology. D = L1 + L2 + B.
among them:
D - diameter;
B——fixed diameter (the spacing of B can be adjusted);
L1, L2 - two sets of probes measure the edge diameter of the rolled material separately;
The fixed diameter of the large diameter caliper is adjusted according to the wire diameter of the rolled material. This has the advantage that the measuring range can be greatly increased without losing the measuring range, and the diameter of all the rolled materials in the production can be detected. .
2, spacing adjustment
As mentioned above, in order to adapt to different measurement ranges, the distance between two photoelectric probes in the system can be moved within a certain range according to the requirements of the measured values. A mechanical mechanism is needed in the system to do this. It consists of a drive motor, a transmission mechanism, and a drive pulse and a rotary encoder. The drive motor uses a stepping motor. When working, first calculate the position of the above probe according to the measurement range, and then convert it into the number of motion steps of the stepper motor. The CPU sends the required control pulse to the output port and sends it to the optocoupler. The function of the optocoupler is to isolate the main part from the stepping motor drive circuit to prevent the interference of the motor part from entering the host. The stepping motor shaft is equipped with a screw rod, and the measuring head is mounted on a rotating head of the screw L. When the motor rotates, the lead screw is rotated, and the position of the CCD changes accordingly. During the adjustment process, the ball screw is monitored by a rotary encoder, and the number of adjustment steps is checked to form a closed loop control for precise adjustment. After adjustment, the system will automatically count the adjustment distance, and the measurement can be performed without calibration of the spacing.
3. Human-computer interaction channel
Because the system is required to work independently, the system should have information input channels and devices that display the operating status of the system. The system has a computer display and an LED display. The LED display is an external electronic screen, which is mainly used for remote observation measurement data, mainly showing measurement diameter and running state, ellipticity size; computer display can display measured data and maximum diameter, minimum diameter, average diameter, ellipticity and other information It can also display information such as trend graphs, cross-section graphs, wave graphs, and defect graphs, as well as long-term storage of measurement data.
4, remote control channel
For remote control and data transfer functions, the system board has a remote control interface for serial communication with a PC. This interface allows the system to receive control information from the PC and transfer the operating status of the machine to the PC. The large diameter caliper can store data for a long time, and the storage time can be more than one year. The historical data can be viewed at any time, and the data can be exported in the form of a table, which is convenient for storage and review.
Conclusion
The large diameter caliper is widely used in the detection of large diameter pipes and bars, and is measured at a high speed with an accuracy of better than 0.05 mm. The measurement system is stable and can be continuously and continuously detected in real time. It is an online automatic detection device. And can adapt to a variety of harsh environments.
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