Flow regulating member of hot dip coating tank and continuous hot dip coating system
View Patent ↗A flow regulating member of a hot dip coating tank which can suppress stir-up of bottom dross, characterized by being provided with horizontal plates which are respectively arranged horizontally from below two side end parts of a sink roll, which is arranged inside of a coating tank in a rotatable manner, toward outside directions of the sink roll and louvers which are arranged above from the end parts of the respective horizontal plates at positions separated from the two ends of the sink roll and which have flow direction changing members which are slanted so that their heights become gradually higher toward the wall surface sides of the coating tank.
1. A flow regulating member of a hot dip coating tank characterized by being provided with
horizontal plates which are respectively arranged horizontally from below two side end parts of a sink roll, which is arranged inside of a coating tank in a rotatable manner, toward outside directions of the sink roll and,
as side members, louvers which are arranged above from the end parts of the respective horizontal plates at positions separated from the two ends of the sink roll and which have flow direction changing members which are slanted so that their heights become gradually higher toward the wall surface sides of the coating tank,
wherein said louvers have entrance side members which slant so as to gradually increase in height from joints of base ends of said flow direction changing members and the entrance side members toward said sink roll direction.
2. The flow regulating member of a hot dip coating tank as set forth in claim 1 , characterized in that said louvers have plated-shaped ribs which hang down from joints of base ends of said flow direction changing members and the entrance side members.
3. The flow regulating member of a hot dip coating tank as set forth in claim 1 , characterized in that a pitch between a bottom end of a flow direction changing member of a louver and the bottom end of the louvers which are provided adjoining said louver above it is 100 to 300 mm.
4. The flow regulating member of a hot dip coating tank as set forth in claim 1 , characterized in that an angle θ1 of entrance side members of said louvers with respect to the horizontal plane and an angle θ2 of the flow direction changing members with respect to the horizontal satisfy −θ2≦θ1≦70° and 20°≦θ2≦40°.
5. A continuous hot dip coating system characterized by being provided with a flow regulating member of a hot dip coating tank as set forth in claim 1 .
6. The continuous hot dip coating system as set forth in claim 5 , characterized in that in said louvers, a horizontal direction dimension from bearing parts of the sink roll in a steel sheet exit side direction is 300 mm or more and in that a horizontal direction dimension from bearing parts of the sink roll in a steel sheet entry side direction is 350 mm or more.
7. The continuous hot dip coating system as set forth in claim 5 , characterized in that a separation dimension of said louvers and wall surfaces in sink roll axis direction of the coating tank is 50 mm or more.
8. The continuous hot dip coating system as set forth in claim 5 , characterized in that said flow regulating member is laid from below the end parts of the sink roll in inside directions of 0 to 15% of a barrel length of the sink roll.
9. The continuous hot dip coating system as set forth in claim 5 , characterized in that the flow regulating member is attached by the support members and horizontal members to edge faces of the hot dip coating tank.