Design of detection and control system for geometric parameters of seamless steel pipe surface based on laser technology

    
    Abstract
    
    The seamless steel pipe industry is one of the most critical sectors in the industrial production. Accurately measuring the geometric parameters of seamless steel pipe surface is the basis for quality control. The conventional manual measurement of seamless steel pipe surface parameters is time-consuming, and the accuracy of measurement is affected by the skill of the inspector. In order to improve the accuracy and efficiency of seamless steel pipe surface parameter measurement, this paper proposes a laser-based detection and control system. The key components of the system are laser sensor and vision system. The laser scanning mode is adopted to obtain the three-dimensional profile information of the pipe surface. The 3D profile information is displayed in real time on the Human Machine Interface and the 3D profile data is processed to obtain the geometric parameters of the pipe surface and compared with the set value. If there is any abnormal situation, the system will prompt an alarm and control the pipeline accordingly. The proposed system has advantages such as high accuracy, fast speed, real-time display and automatic control, which can effectively improve the production efficiency and product quality of the seamless steel pipe industry.
    
    Keywords
    — Seamless Steel Pipe, Laser Technology, Detect and Control System
    
    1 Introduction
    
    Seamless steel pipes have become an important part of modern society and are widely used in industries such as petrochemical, metallurgical, power, marine and aerospace. The surface of seamless steel pipe is the interface with the outside world, and the quality of the surface parameters has a great influence on the comprehensive performance of the pipe. Accurately measuring the surface parameters of seamless steel pipes is the basis for quality control.
    
    In the industry, manual measurement is often used to measure the surface parameters of seamless steel pipes. However, manual measurement has many defects, such as slow speed, low precision, high workload, etc. At the same time, manual measurement is also affected by the inspector's skill level. The accuracy of manual measurement is low and the measurement is limited to two-dimensional parameters.
    
    To make up for the defects of manual measurement, various non-contact measurement technologies have emerged in recent years. Especially the development of laser technology provides new opportunities for the online detection of seamless steel pipe surface parameters. Therefore, a detection control system based on laser technology is designed to improve the efficiency, accuracy and intelligent of measuring seamless steel pipe surface parameters.
    
    2 System Design
    
    The laser-based detection and control system is designed to improve the accuracy, speed and intelligent of the seamless steel pipe surface parameters measurement. It mainly includes laser sensor system and vision system. Figure 1 is a schematic diagram of the proposed system.
    
    
    
    Figure 1 System Architecture
    
    2.1 Laser Sensor System
    
    The laser sensor system is the core part of the proposed system. It includes laser sensor, linear encoder and stepper motor. The laser sensor is used to identify the shape and contour of the pipe. The linear encoder is used to measure the distance between the pipe and laser sensor, and the stepper motor is used for the motion control of the laser sensor. In the proposed system, the laser scanner is used to obtain the three-dimensional profile information of the pipe surface. The scanner works in the scanning line mode, and the laser beam is swept across the profile of the pipe in a spiral way.
    
    2.2 Vision System
    
    The vision system is used to display the 3D profile information in real time and to obtain the geometric parameters of the pipe surface. The system consists of a camera, a PC and an artificial intelligence algorithm. The camera is used to collect the profile information and transmit them to a PC. The PC will perform further processing, including data segmentation, filtering and profile rendering. The artificial intelligence algorithm is used to obtain the geometric parameters of the pipe surface and compares the results with the set value. If there is any abnormal situation, the system will prompt an alarm and control the pipeline accordingly.
    
    3 Conclusion
    
    In this paper, a laser-based detection and control system for measuring the geometric parameters of seamless steel pipe surface is proposed. The proposed system can acquire the 3D profile information of the pipe surface in real time, display the 3D data on Human Machine Interface, extract the geometric parameters and compare with the set value. The system has advantages such as high accuracy, fast speed, real-time display and automatic control, which can effectively improve the production efficiency and product quality of the seamless steel pipe industry.

---