Bearing device for roll of hot dipping bath in continuous hot dip coating line
In a bearing device for a roll of a hot dipping bath, i.e., zinc pot, a sleeve is fastened to a shaft of the roll of the hot dipping bath in a continuous hot dip coating line, i.e., a continuous galvanizing line. A bush housing has a bush internally fixed to support the sleeve, and a curved annular outer surface. Also, bush housing fixed rings are fixed to both inner sides of a fixed ring housing which is associated with a rig of the hot dipping bath roll. Each of the bush housing fixed rings has a curved annular inner surface supporting the bush housing at both sides thereof and in abutment with the curved annular outer surface of the bush housing. The invention allows the steel sheet to be coated with molten metal stably and speedily with high efficiency. Also, the bush and sleeve of the bearing device are not locally worn away, thereby extending useful life of the roll.
1. A bearing device for a roll of a hot dipping bath, in a continuous hot dip coating line comprising:
a sleeve fastened to a shaft of the roll of the hot dipping bath;
a bush housing having a bush internally fixed to support the sleeve, and a curved annular outer surface;
bush housing fixed rings fixed to both inner sides of a fixed ring housing which is associated with a rig of the hot dipping bath roll, each of the bush housing fixed rings having a curved annular inner surface supporting the bush housing at both sides thereof and in abutment with the curved annular outer surface of the bush housing; and
a fixed pin inserted through the fixed ring housing and into a pin hole of the bush housing to prevent wear resulting from rotation of the bush housing.
2. The bearing device according to claim 1 , wherein the curved annular outer surface of the bush housing is convex spherical surface and the curved annular inner surface of the bush housing fixed ring is concave spherical surface to be in surface contact with the convex spherical surface of the bush housing.
3. The bearing device according to claim 1 or 2 , further comprising a bush housing ring engaged with an end of the bush housing to fix the bush.
4. The bearing device according to claim 3 , further comprising a buffer film interposed between the bush housing ring and a side of the bush in the vicinity of the bush housing ring.
5. The bearing device according to claim 1 , further comprising inner and outer fixed rings and a shell housing disposed at both sides of and fixed to the fixed ring housing and the bush housing fixed rings, the shell housing fixedly engaging with the rig of the roll of the hot dipping bath.
6. The bearing device according to claim 5 , further comprising gaskets interposed between the inner fixed ring and the shell housing and between the outer fixed ring and the shell housing to block molten metal from penetrating inside.
7. The bearing device according to claim 1 , further comprising first and second cover members covering from a lower end of the bush housing to the bush housing fixed rings to block molten metal from penetrating inside.
8. The bearing device according to claim 7 , wherein the first cover member has an inner side fixed to the bushing housing and an outer side fixed between the bush housing ring and the inner fixed ring and the second cover member has an inner side fixed to the opposing bush housing fixed ring and an outer side fixed between the bush housing fixed ring and the outer fixed ring.
9. The bearing device according to claim 1 , wherein the bush has dents formed in an inner surface thereof to form a lubricant film for the sleeve.
10. The bearing device according to claim 1 , wherein the roll of the hot dipping bath comprises a stabilizing roll for supporting a steel sheet below an air knife when the steel sheet passes around the roll sunk in the hot dipping bath.