POWDER INJECTING DEVICE FOR HOT DIP METAL COATING DEVICE AND INJECTING METHOD THEREOF

• Main Authors: OTOMO AKINORI, YASUNAGA SHIGENOBU
• Format: Patent
• Language: English
• Published: 01.11.1990
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PURPOSE:To easily change the spraying rate and pattern of powder by controlling the injection timing and injection continuation time of the powder from each of plural nozzles disposed in the transverse direction of a metallic strip in accordance with the transporting speed of the metallic strip. CONSTITUTION:After the metallic strip 1 is passed through a hot dip metal coating chamber 4 having wipers 5 via a deflector roll 3 from an annealing furnace 2, the powder P meeting desired characteristics is stuck thereon by the powder injecting device 6 and the plated strip is taken out through an alloying treatment furnace 7 and a cooler 9. The powder injecting device 6 of the above-mentioned hot dip metal coating device is provided with the nozzle arrays n consisting of the plural nozzles Na disposed in the transverse direction of the metallic strip 1. Further, the on/off control valves V are interposed to carrier gas supplying pipes 17 of the powder P to the nozzles Na. The control valves V of the respective nozzles Na are controlled by a controller 10 in accordance with the transporting speed of the metallic strip 1 detected by a rotation detector 3a mounted to the above-mentioned deflector roll 3 and the injection characteristic patterns of the powder to control the injection timing and injection continuation time of the powder P to be injected together with the gas.