Hot rolled steel coil transversely shearing line online flaw detecting device and method

Abstract

The invention discloses a hot rolled steel coil transversely shearing line online flaw detecting device and method, belonging to a device for testing flaws existing in a solid by utilizing ultrasonic waves, in particular relating to a hot rolled steel coil transversely shearing line online flaw detecting device and method. The hot rolled steel coil transversely shearing line online flaw detectingdevice is characterized by being arranged between a steel coil straightener of a transversely shearing line and a flying shear; an ultrasonic flaw detecting device is formed by sequentially connecting a pinch roll, an entrance length measuring mechanism, a width measuring mechanism, an entrance water retaining mechanism, a flaw detecting mechanism, a water scraping plate, an exit water retaining mechanism, an exit length measuring mechanism and an exit blowing mechanism in sequence; flaw detecting electric control instruments and meters are arranged inside an operating room or electric room at a production line side. Detecting flaws by uncoiling firstly and then shearing are realized. The invention has the advantages of novel conception, compact structure and reasonable process. Flaw detecting and transverse shearing are synchronously carried out, a production line operates smoothly, and the working efficiency and the production rate are increased. A probe is in contact with band steel all the time, the detecting dead zone is greatly reduced, the abrasion of the probe is greatly reduced, the service life is prolonged, the consumption of spare parts is lowered, and the production cost is reduced.

Description

technical field [0001] The invention belongs to a device for testing defects in solids by using ultrasonic waves, in particular to an online ultrasonic testing device for hot-rolled steel coils and a method thereof. Background technique [0002] The hot-rolled strip steel produced in large-scale by the hot-rolling production line has many varieties and wide uses, such as ship hull structural steel, boiler container structural steel and other special steel plates. Such steel plates must be inspected before leaving the factory and judged according to industry standards. Ultrasonic testing technology belongs to non-destructive testing, with low cost and fast detection speed. It uses the ultrasonic device to generate continuous ultrasonic pulses, couples the ultrasonic pulses to the steel strip to be detected through the coupling medium (water), detects the echo signal reflected by the ultrasonic beam from the inside of the steel plate, and then undergoes systematic analysis and...

AI Technical Summary

Problems solved by technology

The disadvantages of this flaw detector are: 1. The system stability is poor; 2. The probe is not flexible; 3. There is no data acquisition and automatic control device; 4. There is a certain blind area at the head and tail of the steel plate; Monitoring, it is difficult to cover the surface of the steel plate, and the work efficiency is very low

At present, the online ultrasonic flaw detection equipment used by the hot-rolling cross-cutting unit detects piece by piece after the strip steel is cut into steel plates by the cross-cut flying shears. The defects are: 1. There are many blind spots in the detection. There will still be a certain blind area in the re-contact process; 2. The detection speed is slow, and the production line speed is limited; 3. The spare parts are consumed. When each steel plate passes, the flaw detection equipment must re-contact with the steel plate, which will increase the probe and Wear of the measuring wheel, shortened service life

Images