Method and apparatus for detecting stress of shaft journals on two end of submergence roller

Abstract

The invention discloses a test method and a detection device to detect the pressure received by the gudgeon journals on both ends of a sink roll, which detects the pressure received by the gudgeon journals on both ends of the sink roll through detection of the vibration signals on the left and right edge parts of a band steel. The steps to detect the pressure is to apply tensile force on the band steel to keep the band steel tensioned; to apply external force on the band steel to excite vibration of the band steel; to measure the vibration signal of the band steel with the device; lowpass filtration of the vibration signal in the step C and to analyze the frequency spectrum of the vibration signal in the step C to get the vibration frequency; to calculate the difference of the tension on both sides of the band steel according to the functional relationship of the tension of the band steel and the vibration frequency; to calculate the difference of the pressure received by the gudgeon journals on both ends of the sink roll according to the functional relationship of the pressure received by the gudgeon journals on both ends and the difference of the tension on both sides of the band steel. By adopting the method and the device, the pressure can be detected simply, conveniently and accurately; the pressure received by gudgeon journals on both ends of the sink roll can be detected quickly; the sink roll is ensured to be parallel with a top roller by adjusting the parallelism of the sink roll and the top roller according to the detection result so as to prevent the gudgeon journals of the sink roll from being abraded and seized, and even the shaft from being broken.

Description

technical field [0001] The invention relates to the installation and positioning of sinking rolls in the production of hot-dip galvanized steel strips, and more specifically relates to a method and device for detecting the stress on journals at both ends of the sinking rolls. Background technique [0002] During the production of hot-dip galvanized strip, see figure 1 As shown, the steel strip 1 enters the zinc pot 5 from the annealing furnace, passes through the sinking roller 2, the air knife 4, etc., and reaches the top roller 3 vertically, thereby completing the hot-dip galvanizing process. Due to the poor production conditions of the hot-dip galvanized steel strip, the sinking roll and its journal are completely immersed in the zinc liquid, and the surface of the sinking roll is often corroded, and the sinking roll needs to be replaced frequently. Since the sinking roll and its journals are completely submerged in the molten zinc, there is no corresponding method to di...

AI Technical Summary

Problems solved by technology

see again figure 2 As shown, but the installation of sinking rolls based on experience is likely to cause deviations in the parallelism between sinking roll 2 and top roll 3. Since the distance between sinking roll 2 and top roll 3 is tens of meters, the tension of strip steel 1 is very high, resulting in the shaft on both sides of sinking roll 2 The stress on the neck is not uniform, forming a large moment, which aggravates the wear of the journal of the sinking roller 2, causing the journal to be seized, or even broken, which becomes the bottleneck of production.

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