Online automatic measurement method for length of stokehole plate blank

Abstract

The invention provides an online automatic measurement method for the length of a stokehole plate blank, which belongs to the technical field of metal processing. According to the method, a laser range finder and a plurality of cold metal detectors are mounted on a stokehole plate blank conveying roller way to realize online automatic measurement of the length of a plate blank; firstly, the plateblank is conveyed in a roller way conveying process; when a rising edge signal of a cold metal detector is received each time, the laser range finder measurement data at the moment are locked and stored, then the effectiveness of the laser range finder measurement data is judged, and finally the actual length of the plate blank is calculated according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detectors. The equipment investment is low, the measuring method is simple, the length measuring range is large, and meanwhile the length of the plate blank can be measured in the plate blank conveying process.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to an online automatic measurement method for the length of a slab in front of a furnace. Background technique [0002] Slab is a kind of steel slab, which is formed by continuous casting of molten steel through continuous casting machine. Generally, the cast slab with a width-thickness ratio greater than 3 is called slab, and it is mainly used for rolling plates. Before the slab is rolled, it first needs to be heated in a heating furnace so that the temperature of the slab reaches about 1200°C, and then the subsequent rolling process is carried out. Before the slab enters the heating furnace, it is necessary to check the information of the slab, including the size and number of the slab. At present, some production lines rely on the observation of the operator to judge whether the information of the slab meets the requirements, and the production efficiency is low. , High...

AI Technical Summary

Problems solved by technology

[0003] At present, a slab length measurement method commonly used by many iron and steel enterprises is to indirectly calculate the slab length by using the signal of the cold metal detector and integrating the roller table speed. As we all know, the roller table motor is generally not equipped with a speed measuring encoder. Therefore, the indirect calculation of the length of the slab by using the speed of the roller table is not accurate, and when the slab slips on the roller table, there will be a large measurement deviation in this measurement method

Another slab length measurement method is: install two or more laser range finders on the slab transport roller table, measure the distance between the range finder and the two ends of the slab head and tail, and then calculate the slab length, This method guarantees the measurement accuracy, but at least two or more laser range finders need to be installed, which increases the initial hardware investment cost and the later instrument maintenance cost

In terms of existing patents, the invention patent "Steel Plate Slab Dimension Measurement Method and Device" describes a slab dimension measurement strategy, which adopts the method of machine vision, and first uses a laser projector to project the slab length and width directions The laser line, and then the slab image is taken by the camera, and finally the length and width of the slab are recognized and calculated. This method has high investment costs, complicated measurement and calculation processes, and complicated system maintenance in the later stage. Although the slab size can be measured, it is cost-effective. not tall

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