JPH08193617A - Bath roll of molten metal plating facilities - Google Patents

Abstract

PURPOSE: To facilitate repair, replacement and remodeling of a roll shaft part by forming a dividable structure for the roll shell part and the roll shaft part of a bath roll in molten metal plating facilities. CONSTITUTION: The part of a roll shaft part 21 mounted at both the end parts of the roll shell part 20 of a bath roll is divided and connected through a flange type shaft coupling 22. The roll shaft part on the opposite side to the roll shell part is rotatably-supported by a sliding bearing 23. Between the flanges 22-1 of a flange type shaft coupling 22, a graphite sheet or a tantalum sheet is applied, or WC-Co group or ZrO2 group is injected to the inside of the flange 22-1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-bath roll provided in a plating tank of a molten metal plating facility, and more particularly to a shaft part by forming a shaft part and a roll body part of the roll into a split structure. The present invention relates to a bath roll that can be individually repaired and remodeled.

[0002]

2. Description of the Related Art In recent years, the demand for surface-treated steel sheets of hot-dip galvanized steel strip having excellent corrosion resistance, paintability, etc. has been expanding. As a typical method for producing a hot-dip metal-plated steel strip of this surface-treated steel sheet, a method of immersing a steel strip to be plated in a hot-dip metal plating bath is generally used. That is, as shown in the outline of a typical molten metal plating equipment in FIG. 10, a steel strip 1 to be plated whose surface has been cleaned and activated in a continuous annealing furnace is immersed in a plating tank 2 and a sink roll in the bath. The advancing direction is changed by 3 and is pulled upward from the plating tank 2 via the collecting roll 4 and the stabilizing roll 5. Then, a compressed gas such as air is jetted from the wiping nozzle 6 arranged above the plating tank to wipe off the excess plating solution, thereby adjusting the amount of plating adhered.

The collecting roll 4 located in the bath of the hot-dip galvanizing equipment is a shape-correcting roll for correcting warping of the plated steel strip, and the stabilizing roll 5 is for stabilizing the path of the plated steel strip. These are rolls, and these are generically called support rolls. Each of the sink roll and the support roll has a rotation support member rotatably supported by a frame or an arm.

The sink roll and the support roll arranged in the bath are pulled up from the bath after a certain period of use, disassembled, repaired, maintained, etc. for the next use, and then reassembled. The roll is disassembled and repaired separately for the roll body and the shaft, but due to the progress of the thermal spray technology, the roll body has improved durability and can be used for a long period of time. Is extremely low, but the roll shaft portion has almost no measures against wear, so that the bearing must be repaired or replaced in preparation for the next use. At that time, since the roll body and the shaft are integrated, even if only the bearing is repaired, it is necessary to treat the entire roll.

The bearing portion of the in-bath roll will be described, for example, in the case of a rolling bearing type. As shown in FIG. 9, the shaft portions 11 at both ends of the roll body 10 are covered with caps usually called sleeves 12, The open end of the sleeve is welded to the roll body 10. This sleeve 12
The bearings (metal) 13 that come into rolling contact with and are repaired by overlaying and reused, or after being used several times, both of them are replaced with new ones. The frequency of reuse is different from the sleeve and the metal, and the metal may be used as a new item every time.

[0006]

The exchange of rolls in the bath is
Defects on the roll surface (rough skin, peeling of the sprayed layer, etc.) and wear of the bearing are the main reasons. Can withstand. On the other hand, the roll bearing part is severely worn and needs to be repaired or replaced at regular intervals. At this time, even if the roll surface does not need to be repaired, the roll body and shaft of the conventional bath roll are integrated, so even if only the bearing is repaired, the roll body and shaft are integrated. Is applied.

By the way, when repairing the bath roll,
After pulling the roll out of the bath, pickling of the plating bath immersion part is performed. In the case of a conventional roll in the bath in which the roll body and the shaft are integrated, even if the roll surface is sufficiently treated. ,
If the bearing portion is in an insufficiently pickled state, pickling must be continued, resulting in excessive pickling of the roll surface, which may adversely affect the roll surface.

When the bearing (sleeve, metal) is not reused after the pickling, the bearing is replaced with a new one. However, in the case of the roll body and the roll integrally formed with the shaft, only the bearing is used. Since the entire roll is repaired, it takes a lot of time and labor to carry and replace the roll.

The present invention has been made in view of the conventional situation as described above, and has a structure in which the roll barrel portion and the shaft portion are separable, so that the bearing portion can be easily provided separately from the roll barrel portion. It is an object of the present invention to provide a bath roll for a hot dip galvanizing facility that can be disassembled, repaired, and attached.

[0010]

The bath roll according to the present invention is characterized in that the roll shaft portion and the roll body are divided by a detachable coupling means.
As a means for joining the roll shaft portion and the roll body portion in the bath roll of this divided structure, a method of joining with a flange type shaft joint, a method of joining the roll shaft portion and the roll body portion with a concavo-convex fitting method, and a flange type A method of connecting with a shaft joint, a method of connecting with a flange type shaft joint by interposing a graphite sheet or a tantalum sheet in the connecting portion of the roll shaft portion and the roll body portion, welding or bolts by a concavo-convex fitting method using a sleeve. Adopt a method of combining. Further, the WC-C is formed on the inner surface of the flange of the flange type shaft coupling.
This is characterized in that the o-based or ZrO ₂ based thermal spraying is applied.

[0011]

In this invention, the roll body and the roll shaft are
The roll shaft portion is divided, and the portion is connected with a flange type shaft joint. The reason why the flange type shaft coupling (fixed shaft coupling) is adopted as the coupling means is that the shaft center deviation is not allowed in the case of a bath roll. In the case of a bath roll with this split structure, the roll shaft part on the side opposite to the roll body is rotatably supported by the bearing.Therefore, remove the tightening bolt of the flange type shaft coupling to remove the bearing part. It can be easily separated from the roll body. The tightening bolts that connect the flanges of the joint body are preferably made of tantalum or tantalum-tungsten alloy (see Japanese Patent Laid-Open No. 5-187445) in consideration of corrosion resistance due to molten zinc or the like.

As a concavo-convex fitting method when a combination of a coupling method using a flange type shaft coupling and a concavo-convex fitting method is adopted as a coupling means for the roll shaft portion and the roll body portion, a convex portion is provided on the roll bearing side. Either of the method of forming a concave portion on which the convex portion fits is provided on the roll barrel portion side, or forming a convex portion on the roll barrel portion side and providing a concave portion on which the convex portion fits on the roll bearing side. Good. By adopting this concavo-convex fitting method, it becomes possible to perform center alignment between the shaft core and the roll core easily, quickly and accurately. Furthermore, it is more effective from the viewpoint of power transmission that the fitting portion is rectangular rather than cylindrical or conical.

In the present invention, the graphite sheet or tantalum sheet is interposed between the roll shaft portion and the roll body portion because the graphite sheet or tantalum sheet is hard to be wet by molten metal such as molten zinc. This is because it has a material. When a sheet made of such a material is interposed, an alloy of Fe and Zn is not formed in the flange of the joint body, so Zn can be prevented from entering. In addition, the WC on the inner surface of the flange of the joint body
-By applying Co-based or ZrO ₂ -based thermal spraying,
Similar to the case of using the above-mentioned sheet, it is possible to make it difficult to form the Fe-Zn alloy in the flange and to facilitate the separation of the shaft portion.

In the case of a structure in which a sleeve is fitted on the roll shaft portion in a concavo-convex manner and welded or bolted to the roll body portion, and this sleeve portion is supported by a rolling bearing, the rolling bearing together with the sleeve is detached from the roll shaft portion. it can. In addition, it is desirable that the portion to which power is transmitted be rectangular rather than cylindrical.

[0015]

1 to 8 exemplify a joint structure of a roll copper portion and a shaft portion of a bath roll according to the present invention, and FIG. 1 shows that the roll copper portion and the shaft portion are joined by a flange type shaft coupling. Structural example,
FIG. 2 shows an example of a joint structure in which the roll body and the shaft are combined with the concavo-convex fitting method and the flange type shaft joint, and FIG. 3 is a combination of the concavo-convex fitting method opposite to that in FIG. 2 and the flange type shaft joint. 4 is a structural example in which a graphite sheet or a tantalum sheet is interposed between the roll shaft portion and the roll body portion with a flange type shaft coupling, and FIGS. An example of a joint structure applied to a rolling bearing is shown below.

The connecting structure shown in FIG. 1 is a system in which the portions of the roll shaft portions 21 provided at both ends of the roll body portion 20 of the bath roll are divided and the portions are joined by the flange type shaft joint 22. The flange 22-1 of the joint body is welded to the joint ends of the roll body side and the shaft side, respectively, and the flanges are fastened with bolts 22-2 to join them. Two
Reference numeral 3 is a plain bearing. As described above, the tightening bolt 22-2 for connecting the flange 22-1 of the joint body is made of tantalum or tantalum-tungsten alloy in consideration of the corrosion resistance of molten zinc or the like. Further, in order to prevent the distortion of the flange portion, it is effective to provide a rib or a boss portion on the flange.

In the coupling structure shown in FIG. 2, a convex portion 21-1 is provided on the roll shaft portion 21 side and a concave portion 20 is formed on the roll body portion 20 side.
-1 is formed, the roll body portion and the shaft portion are fitted to each other by concavo-convex, and the same flange type shaft coupling 22 as in FIG. 1 is used for coupling. The concavo-convex fitting portion in this coupling method may be any of a cylindrical shape, a conical shape, and a rectangular shape, but a rectangular shape is preferable in terms of power transmission.

The connecting structure shown in FIG. 3 shows a case where the concave-convex fitting method in the connecting structure shown in FIG. 2 is reversed, and a convex portion 20-11 is provided on the side of the roll body 20 to project the roll. This is a method in which a concave portion 21-11 is formed on the side of the shaft portion 21 so that the roll body portion and the shaft portion are fitted in concavo-convex.

The joint structure shown in FIG. 4 is the same joint structure as that shown in FIG. 1, and a graphite sheet or a tantalum sheet is provided between the flanges 22-1 of the joint body formed by welding the joint ends on the roll body side and the shaft side. The sheet 24 is made of a material that is hard to be wetted by molten zinc.
This is a means for preventing the formation of Fe-Zn alloy in the flange, but as another means for achieving the same purpose, WC-Co type or Z
Similar effects can be obtained even if rO ₂ system thermal spraying is performed. It goes without saying that this surface treatment by thermal spraying can also be applied to each of FIGS.

In the coupling system using the flange type shaft coupling shown in FIGS. 1 to 4, the roll shaft portion 21 can be separated from the roll body portion 20 by simply removing the flange tightening bolt 22-2. The unit 21 and the roll body 20 can be easily and quickly joined together.

In the coupling structure shown in FIG. 5, a solid sleeve 35 is used, a rolling bearing 32 is mounted on the outer circumference of the sleeve, and a collar 35-1 at the end of the sleeve and a collar 30 at the side of the roll body 30 are provided. This is a method in which -1 and -1 are bolted together. In addition,
In order to facilitate the center alignment, a concavo-convex fitting portion is provided on the roll shaft center of the joint end surface of the solid sleeve 35 and the roll body portion. Also in this case, the roll body portion 30 is connected through the bolt connecting portion.
The bearing can be easily attached and detached.

The coupling structure shown in FIG. 6 has a collar portion 2 at the opening end.
The sleeve 25 having a concave cross-section having 5-1 is fitted into the roll shaft portion 31 having a small diameter and a short length as much as the sleeve is fitted, and the collar portion 25-1 and the collar on the roll body portion 30 side. This is a method of connecting the portion 30-1 with a bolt. In the case of this coupling method, in order to more securely transmit power, a rectangular convex portion 31-1 is provided at the tip of the roll shaft portion 31, and a concave portion into which the convex portion is fitted is formed in the sleeve 25. And then fit them together. Therefore, in this case, the concavo-convex fitting portion between the roll shaft portion 31 and the sleeve 25 is at two places, the straight portion of the roll shaft portion and the convex portion 31-1. In other words, it is a connection structure by a two-step uneven fitting method. 33 is a bearing retainer, 3
4 is a mounting bolt. In the case of this coupling structure, the roll body portion and the bearing portion can be separated by separating the sleeve 25 from the roll body portion 30 and sliding the sleeve 25 outward. When the convex portion 31-1 has a cylindrical shape, a key groove is provided to ensure that power is transmitted.

The coupling structure shown in FIG. 7 exemplifies a method in which the sleeve 25 and the roll body 30 are directly bolt-coupled to each other. In the coupling structure shown in FIG.
5-1 Bearing retainer 3 fitted between the point bearing 32 and the bearing
3 is eliminated, and this portion is integrally provided on the outer circumference of the sleeve 25, and the flange portion 25-1 on the sleeve side and the flange portion 30-1 on the roll body portion 30 side are bolted together. Also in the case of this coupling structure, the roll body portion and the bearing portion can be separated by separating the sleeve 25 from the roll body portion 30 and sliding the sleeve 25 outward.

The coupling structure shown in FIG. 8 is an example of the coupling structure shown in FIG. 6 in which the sleeve 25 and the roll body 30 are coupled by welding instead of the bolt coupling method. This is a method of welding the collar portion 25-1 formed on the end portion to the end surface of the roll body portion 30. In this case, the roll body portion and the bearing portion can be separated by separating the welded portion between the sleeve 25 and the roll body portion 30.

In the case of the sleeve type coupling structure shown in FIGS. 5 to 8, the roll body and the bearing can be easily separated by simply separating the sleeves 35 and 25 from the roll body 30. .

[0026]

As described above, in the bath roll according to the present invention, since the roll body and the roll shaft can be easily separated, the pickling, the repair and the remodeling can be performed separately. . In particular, for bearings that are heavily worn and require repair at regular intervals, it is possible to pickle the bearing alone, thus avoiding the effects on the roll surface and repairing or replacing work after pickling. Can also be done alone. Furthermore, when assembling the roll in the bath, that is, when mounting the roll and the bearing on the frame, the roll body and shaft can be separated and assembled, so that the roll body and shaft can be combined freely and properly. You can also choose the other party. As a result, it becomes possible to effectively use the roll body and the shaft, and the inventory of the roll and the bearing is compressed, resulting in a great economic effect.

[Brief description of drawings]

FIG. 1 is a schematic view showing a structural example in which a roll body and a shaft of a bath roll according to the present invention are connected by a flange type shaft joint.

FIG. 2 is a schematic view showing an example of a joint structure in which a roll body portion and a shaft portion of a bath roll are combined by combining a concavo-convex fitting method and a flange type shaft coupling.

FIG. 3 is a schematic diagram showing an example of a connecting structure by a combination of a concavo-convex fitting method, which is the reverse of FIG. 2, and a flange type shaft coupling.

FIG. 4 is a schematic view showing an example of a structure in which a graphite sheet or a tantalum sheet is interposed in a joint portion between a roll shaft portion and a roll body portion of a roll in a bath and they are joined together by a flange type shaft joint.

FIG. 5 is a partially broken schematic view showing an example of a joint structure applied to a rolling bearing in which a bearing is removed together with a sleeve.

FIG. 6 is a schematic view showing another example of the joint structure applied to a rolling bearing in which the bearing is removed together with the sleeve, partially broken away.

FIG. 7 is a schematic view showing another example of a joint structure applied to a rolling bearing in which the bearing is removed together with the sleeve, partially broken away.

FIG. 8 is a schematic view showing another example of the joint structure applied to a rolling bearing in which the bearing is removed together with the sleeve, partially broken away.

FIG. 9 is a schematic view showing an example of a bearing portion of a conventional in-bath roll partially broken away.

FIG. 10 is a schematic view showing a typical hot-dip galvanizing facility that is the subject of the present invention.

[Explanation of symbols]

 1 Steel Plate to be Plated 2 Plating Tank 3 Sink Roll 4 Collecting Roll 5 Stabilizing Roll 6 Wiping Nozzle 20, 30 Roll Body 21, 31 Roll Shaft 22 Flange Type Shaft Coupling 22-1 Flange 22-2 Bolt 23 Slide Bearing 24 seat 25 sleeve 32 rolling bearing 33 bearing retainer 34 mounting bolt 35 solid sleeve

Claims (6)

[Claims] 1. A molten metal plating facility, which is a roll in a bath provided in a molten metal plating tank, wherein a roll shaft portion and a roll body portion are separated by a detachable coupling means. Roll in the bath. 2. The in-bath roll of the hot dip galvanizing equipment according to claim 1, wherein the roll shaft portion and the roll body portion are connected by a flange type shaft joint. 3. The hot-dip galvanizing equipment according to claim 1, wherein the roll shaft portion and the roll body portion are joined together by a concavo-convex fitting method and are joined together by a flange type shaft joint. Roll in the bath. 4. The molten metal according to claim 2 or 3, characterized in that a graphite sheet or a tantalum sheet is interposed in the joint portion between the roll shaft portion and the roll body portion and the roll shaft portion and the roll body portion are joined together by a flange type shaft joint. Roll in bath of plating equipment. 5. The WC is formed on the inner surface of the flange of the flange type shaft coupling.
4. The in-bath roll of the molten metal plating equipment according to claim 2 or 3, which has been subjected to Co-based or ZrO ₂ -based thermal spraying. 6. A structure in which a sleeve is fitted into a roll shaft portion in a concavo-convex manner, the open end of the sleeve is welded or bolted to a roll body, and the sleeve portion is supported by a rolling bearing. A bath roll for hot dip metal plating equipment.