JPH02228460A - In-bath roll device of hot dip metal coating equipment - Google Patents

Abstract

PURPOSE:To prevent the generation of a slip between a steel sheet to be plated and an in-bath roll and the generation of flaws by friction on the surface of the plated steel sheet by rotating the in-bath roll in contact with the steel sheet to be plated in a galvanizing bath at the same speed as the passing speed of the steel sheet by supporting rolls held in contact with the in-bath roll. CONSTITUTION:The steel sheet 1 is immersed in the galvanizing bath 2 and after the direction is changed in a vertical direction by the in-bath roll 11, the steel sheet is pulled up from the plating bath 2. The deposition of molten Zn is adjusted by wiping nozzles 4 to form the galvanized steel sheet 6. A barrel part 11a and a rolling part 11b are provided on the in-bath roll 11 in this case and the steel sheet 1 to be plated is wound about half round on the barrel part 11a. The outer peripheral surfaces of two pieces of the supporting rolls 12 having roller bearings 13 in the upper part are brought into contact with the rolling part 11b from the surface of the plating bath 2. The supporting rolls 12 are revolved by motors 14 at the circumferential speed which is the same as the passing speed of the steel sheet 1. The generation of the slip between the steel sheet and the barrel part of the in-bath roll 11 is prevented and the generation of the flaws on the plated steel sheet by the slip is prevented. The galvanized steel sheet 6 having the excellent quality of the placed surfaces is thus produced.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an in-bath roll device provided in a molten metal bath of a molten metal plating facility.

<Prior Art> Conventionally, when continuously applying hot-dip metal plating to a strip-shaped steel plate, - To conclude a contract, the steel sheet 1 to be plated is once drawn into a molten metal bath 2, as shown in FIG. A device that changes the direction of the bath using a roll 3 and pulls it up vertically, and blows off the excess molten metal that has adhered to the bath using a wiping nozzle 4 provided above the bath to achieve the required plating thickness. is used.

In such equipment, it is essential that the bath roll 3 rotates smoothly to prevent relative slippage between its body and the steel plate 1 to be plated, but this is often not possible. If the plated steel plate 1 does not rotate properly, slippage may occur between the plated steel plate 1 and the plated surface may be scratched, resulting in a significant loss of quality.

Generally, the bath roll 3 has shafts 3 provided at both ends thereof.
The sliding surface between the shaft 3a and the sliding bearing 5 is lubricated by the molten metal filled in the molten metal bath 2. has been done.

Since the roll 3 in the bath is completely immersed in the high-temperature molten metal, it is actually extremely difficult to forcibly drive it to rotate with an external prime mover. It has no choice but to be able to be rotated passively by the movement of.

In this way, using the sliding bearing 5 and relying on the lubricating action of the molten metal, t, ! ! If +1 is also expected to rotate in a driven manner, when the frictional force increases due to wear of the sliding bearing 5 or foreign matter contained in the molten metal getting caught on the sliding surface, the steel plate 1 to be plated and the roll in the bath will 3 may cause slippage, causing scratches on the brushed steel plate 6, or in extreme cases, the bath roll 3 may not rotate and may even become inoperable.

Furthermore, when the passing speed of the steel plate 1 to be plated increases to several tens of meters per minute or more, molten metal is strongly drawn between the steel plate 1 to be plated and the body of the roll 3 in the bath, and as a result, The steel plate 1 to be plated is partially lifted from the body of the roll 3 in the bath, and rotational force sufficient to overcome the large frictional force of the sliding bearing 5 is not transmitted from the steel plate 1 to be plated to the roll 3 in the bath. The roll 3 in the bath does not move at the same speed as the coated steel plate 1, resulting in slippage and scratches on the plated steel plate 6.

In order to reduce this phenomenon, a groove is carved into the body of the roll in the bath 3, so that the molten metal drawn through the groove can be easily discharged, so that the steel plate 1 to be plated can be removed from the roll in the bath. Although measures have been taken to prevent the groove from floating away from the plate 3, sometimes the shape of this groove is transferred to the plated TM plate 6, resulting in an inconvenience such as deterioration of the quality of the plated surface.

In addition, attempts have been made to use rolling bearings in place of the sliding bearings 5 in order to allow the rolls 3 in the bath to rotate lightly, but there are some suitable methods to prevent hot molten metal from entering the rolling bearings. The reality is that there is no sealing method and it has not yet been put into practical use.

<Problems to be Solved by the Invention> Therefore, the present applicant has disclosed a method in which the bearing part of the roll in the bath is exposed above the bath surface and the roll in the bath is partially immersed (see Japanese Patent Publication No. 60-48586). In this case, (1) the conveying surface of the roll in the bath rotates cutting through the bath surface, which tends to cause floating dross to be drawn in;

-Depending on conditions such as the plate approach angle, plate passing speed, and immersion depth, the molten metal may not flow around sufficiently, and a separate supply device must be provided.

There is a problem.

The present invention solves the above problems and provides a bath roll device for hot-dip metal plating equipment that does not cause slippage between the bath roll and the steel plate to be plated and provides excellent wipe surface quality. It is intended to.

Means for Solving the Problems> In order to achieve the above object, the present invention provides molten metal plating equipment that is immersed in a molten metal bath and that changes the direction of a steel plate to be plated in the molten metal bath. In the bath roll device, the bath roll is located in the molten metal bath and has a body portion for wrapping a steel plate to be plated, and a rolling portion provided at both ends thereof for rolling contact support; a support roll having at least a shaft portion above the surface of the molten metal bath and for rolling contact supporting the rolling portion of the roll in the bath; means for rotationally supporting the support roll outside the molten metal bath; There is provided a roll-in-a-bath device for molten metal cleaning equipment, characterized in that it has means for rotationally driving the roll.

It is preferable that the diameter of the rolling portion of the bath roll is larger than the diameter of the body of the bath roll, and that the roll is supported in rolling contact with the support roll above the molten metal bath surface.

Preferably, each of the rolling parts is supported in rolling contact with a pair of support rolls.

The present invention will be explained in more detail below based on one embodiment.

1 and 2 are a side sectional view and a front view of hot-dip galvanizing equipment using the roll-in-bath device of the present invention,
10 is a roll-in-a-bath device of the present invention.

The bath roll device 10 includes a bath roll 11, a support roll 12, a bearing 13, a prime mover 14, and the like.

The roll 11 in the bath is used to change the direction of the steel plate 1 to be plated, which is placed in the molten zinc bath 2, in the vertical direction in the molten zinc bath 2. The plated steel plate 1 is wrapped around the range of
Due to the tension of the plated steel plate 6, a strong pulling blade is applied upward.

The support roll 12 is a bath roll 1 receiving a pulling blade.
1 to support the rolling parts 11b provided at both ends of the support roll 12, and the roll surface of the support roll 12 and the rolling parts 11b
Two of them are placed at each location so that the transfer surfaces of the two are in contact with each other. The number of support rolls 12 disposed in each rolling portion 11b is not limited to two, and may be three or more.

The shaft portions 12a of the support rolls 12 are completely exposed above the molten zinc bath surface 2a, and there are two means for rotationally supporting the support rolls 12 provided above the molten zinc bath surface 2a, such as bearings 13. are supported in a cantilevered state above the molten zinc bath surface 2a, and these are also connected to the prime mover 14.
are connected to the rotating shafts of each. The number of the bearings 13 may be one each.

The prime mover 14 is for rotating the bath roll 11 at the same circumferential speed as the passing speed of the covered steel plate 1, and rotates the support roll 12 in the direction of the arrow 15, thereby rotating the bath roll 11. 11 is rotationally driven in the direction of arrow 16.

If the roll 11 in the bath is a hollow sealed roll, its apparent specific gravity will be small and a large buoyant force will be generated, and this buoyant force will act as a pressing force on the support roll 12, thereby controlling the rotation of the roll 11 in the bath. However, it is even more convenient.

Further, in order to facilitate positioning of the bath roll device 10 except for the bath rolls 11 and easy attachment/detachment to hot-dip galvanizing equipment, the entire bath roll device 10 except the bath rolls 11 is mounted on a mount (not shown) or the like. It is recommended to place it on

Further, if the structure is such that only the bath roll 11 can be held at both ends and handled by separating it from the support roll 12, it will be convenient for maintenance work and the like.

In such a bath roll device 1o, since the bath roll 11 is simply supported in rolling contact with the support roll 12, the rotational resistance is extremely low. Since it is rotationally driven, no slippage occurs between the roll 11 in the bath and the steel plate I to be plated.

Further, since the bearing 13 supporting the support roll 12 is provided above the molten zinc bath surface 2a, it is not exposed to molten zinc or high temperatures, and therefore it is not exposed to the molten zinc or high temperature. It is extremely effective in terms of repair, price, quality, and even productivity.

In addition, in the above-mentioned bath roll device 10, the bath roll 1
The rolling contact support part between the rolling part 11b of the bath roll 11 and the support roll 12 is submerged in molten zinc.For example, as shown in FIG. Part t
It is also possible to set the rolling contact support part between the rolling part 11b and the support roll 12 above the molten zinc bath surface 2a by making the diameter larger than the diameter of the support roll 12. Since it is not immersed in the zinc bath 2, it is advantageous in terms of heat resistance and resistance to molten zinc.

Furthermore, although the above description has been made regarding zinc plating, the present invention is not limited to this and can be applied to all types of molten metal plating such as aluminum alloys and tin alloys.

<Example> The present invention will be specifically explained below based on Examples.

(Example 1) A cold-rolled steel sheet having a thickness of 0.5 mm and a width of 1400 mm was galvanized on both sides using the hot-dip galvanizing apparatus shown in FIG. 1 under the following conditions.

Diameter of rolling part of roll in bath H800mm Diameter of support roll: 500mm Molten zinc: 2000x 2000x 1500
mm Threading speed: 80 m per molecule The obtained hot-dip galvanized steel sheet had no abnormal patterns or scratches on the plated surface and was of high quality.

Moreover, no slipping occurred between the steel plate to be plated and the roll in the bath during manufacturing.

<Effects of the Invention> Since the present invention is configured as described above, when used in hot-dip galvanizing equipment, slippage does not occur between the roll in the bath and the steel plate to be plated, and an excellent plated surface can be obtained. You can get goods.

Further, since the rotational drive source and bearing of the support roll are provided above the molten metal bath surface, the material and structure thereof are advantageous.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are a side sectional view and a front view, respectively, showing an embodiment of hot-dip galvanizing equipment using the roll-in-bath device of the present invention. FIG. 3 is an explanatory diagram showing another example of the bath roll device of the present invention. FIG. 4 is an explanatory diagram of conventional hot-dip galvanizing equipment. 0... Roll in bath device, 1-... Roll in bath, 1a... Trunk, 1b... Rolling part, 2... Support roll, 2a... Shaft, 3... Bearing, 4... Electric motor, 5... Rotation direction of support roll, 6... Explanation of rotation direction code of roll in bath 1... Steel plate to be plated, 2... Molten metal bath, 2a...・Bath surface, 3... Roll in bath, 3a... Shaft, 4... Wiping nozzle, Q... Sliding bearing, 6... Plated steel plate,

Claims (3)

[Claims] (1) In a bath roll device for molten metal plating equipment that is immersed in a molten metal bath and for changing the direction of the steel plate to be plated in the molten metal bath, the steel plate to be plated is rolled while in the molten metal bath. a roll in a bath having a body for attaching and a rolling part provided at both ends of the roll for rolling contact support; A method for molten metal plating comprising: a support roll for rolling and contacting support of a part of the metal; a means for rotationally supporting the support roll outside the molten metal bath; and a means for rotationally driving the support roll. Equipment bath roll device. (2) The rolling part of the bath roll has a diameter larger than the diameter of the body of the bath roll, and is supported in rolling contact with the support roll above the molten metal bath surface. In-bath roll device for hot-dip metal plating equipment. (3) The in-bath roll device for molten metal plating equipment according to claim 1 or 2, wherein each of the rolling parts is supported in rolling contact with a pair of support rolls.