Slit band sheet coiling-tension applying device
A device for applying coiling-tension to a slit band sheet ( 1 ) includes: an upper structure ( 3 ) that is disposed on the upper side of a band sheet ( 2 ) which has been passed through a slitter line and slitted; and a lower structure ( 4 ) that is disposed on the lower side of the band sheet ( 2 ). The upper structure ( 3 ) includes two cooling rolls ( 6 ) over which an upper belt ( 5 ) is stretched, and an upper pressing part ( 7 ) that is disposed between the cooling rolls ( 6 ). Further, the lower structure ( 4 ) includes two cooling roller ( 9 ) over which a lower belt ( 8 ) is stretched, and a lower pressing part ( 10 ) that is disposed between the cooling rolls ( 9 ).
1. A device for applying coiling-tension to a slit band sheet, comprising:
a first stretched portion having a first cooling roll that is constructed to be independently rotatable, has a cylindrical shape, and has coolant inside the first cooling roll;
one or more first belts made of materials having different coefficients of friction, being in contact with the first stretched portion at a side thereof having a smaller coefficient of friction than that of an opposite side thereof, and being stretched in a ring shape to be freely rotatable;
a first pressing portion, being in contact with the side of the one or more first belts, having the smaller coefficient of friction, in a predetermined length;
a second stretched portion constructed to be positioned to face the first stretched portion and to have a second cooling roll that is constructed to be independently rotatable, has a cylindrical shape, and has coolant inside the second cooling roll;
one or more second belts made of materials having different coefficients of friction, being in contact with the second stretched portion at a side thereof having a smaller coefficient of friction than that of an opposite side thereof, and being stretched in a ring shape to be freely rotatable; and
a second pressing portion, constructed to be positioned to face the first pressing portion and to be close to the first pressing portion, and to be in contact with the side of the one or more second belts having the smaller coefficient of friction in a predetermined length,
wherein each of the first cooling roll and the second cooling roll has an inner cylinder on a side of a center shaft and an outer cylinder substantially surrounding the inner cylinder,
wherein the coolant is circulated in a space formed between the inner cylinder and the outer cylinder,
wherein the inner cylinder is integrated with a rotary shaft such that the inner cylinder is of solid construction,
wherein a cross-sectional area of the space is 2.5 to 5.0 times a cross-sectional area of a pipe on an inlet side of the coolant entering into each of the first and second cooling rolls, and
wherein the cross-sectional area of the space is 2.5 to 5.0 times a cross-sectional area of a pipe on an outlet side of the coolant exiting from each of the first and second cooling rolls.
2. The device as claimed in claim 1 , wherein the one or more first belts are disposed side by side with each other in the first stretched portion having the same intervals between each adjacent one or more first belts, and the one or more second belts are disposed side by side with each other in the second stretched portion and having the same intervals between each adjacent one or more second belts.
3. The device as claimed in claim 1 , wherein the coolant circulated between the inner cylinders and the outer cylinders is cooling water.
4. The device as claimed in claim 1 , wherein the outer cylinders has a thickness of 3 mm or less.
5. The device as claimed in claim 1 , wherein the first cooling roll and the second cooling roll are disposed so as to advance a slitter line in a direction in which a the slit band sheet is conveyed.
6. The device as claimed in claim 1 , comprising a couple of the first cooling rolls, disposed at both sides of the first stretched portion, and a couple of the second cooling rolls, disposed at both sides of the second stretched portion.
7. The device as claimed in claim 1 , wherein
the first stretched portion is provided with the first cooling roll disposed at one end thereof and a first belt reversing portion disposed at the other end thereof, the first belt reversing portion having a semi-cylindrical cross-section in a longitudinal direction, and
the second stretched portion is provided with the second cooling roll disposed at one end thereof and a second belt reversing portion disposed at the other end thereof, the second belt reversing portion having a semi-cylindrical cross-section in a longitudinal direction.