JPH04341525A - Sleeve roll - Google Patents

Abstract

PURPOSE:To provide a sleeve roll where whirling of a sleeve is prevented and breakage of the ceramic sleeve in a continuous annealing furnace is prevented. CONSTITUTION:This sleeve roll has the ceramic sleeve 11 in contact with a high temp. strip, a roll shaft 12 inserted in this sleeve 11 and compressive coil spring 13 freely inserted at least on one part side of this roll shaft 12 and fixes the sleeve 11 so as to rotate together with the roll shaft 12 by pressing the sleeve 11 to the axial direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a sleeve roll having a ceramic sleeve installed in a continuous annealing furnace of a surface treatment line.

0002

[Prior Art] For example, a thermometer is installed in a continuous annealing furnace of a hot-dip galvanizing line to measure the temperature of a steel strip.
is located. If such a protective roll is made of metal, iron powder will adhere to the steel strip from the roll and have a negative effect on the plating process, so the portion of the protective roll that contacts the steel strip should be made of heat-resistant ceramic. It is said that

In this case, if the large-diameter protective roll is made entirely of ceramics, it is likely to crack during sintering because of its thick wall thickness, and even if it does not crack during sintering, it is likely to crack during use. For this reason, a ceramic-integrated roll is not practical, and a ceramic sleeve-type roll is used.

[0004] In conventional ceramic sleeve rolls, a stainless steel roll shaft is inserted into a sleeve made of fused silica ceramic, and the ceramic sleeve is positioned on the pass line of the steel strip. Placed. In this case, the thermal expansion of fused silica ceramics is approximately 0.04% at a temperature of 1000°C, whereas the thermal expansion of stainless steel (SUS3
Since the thermal expansion of 04) is approximately 0.167% at a temperature of 100°C, a predetermined gap is provided between the sleeve and the roll shaft to absorb the difference in thermal expansion between the two. .

[0005]

[Problems to be Solved by the Invention] However, in conventional sleeve rolls, the sleeve is not firmly fixed to the roll shaft, so the sleeve does not attach to the roll shaft during use. The sleeve often breaks due to the impact and load it receives from swinging around and moving in the axial direction.

[0006] This invention was made to solve the above problems, and prevents cracking of the sleeve by preventing swinging and axial movement of the sleeve.
An object of the present invention is to provide a three-roll roll that can extend the life of the roll.

[0007]

[Means for Solving the Problems] A sleeve roll according to the present invention includes a ceramic sleeve member that contacts a high-temperature conveyed object, and a roll shaft inserted into the sleeve member. The sleeve member is loosely fitted onto at least one side of the roll shaft member, and is pressed against the sleeve member in the axial direction to rotate the roll shaft member.
It is characterized by comprising a compression coil spring that is fixed so as to rotate together with the roll shaft member, and a spacer bolt that maintains a constant mutual gap between the sleeve member and the roll shaft member.

[0008]

[Operation] In the sleeve roll according to the present invention, the ceramic sleeve member is pressed in the axial direction by a compression coil spring, and the sleeve member is attached to the axis of the roll shaft member by a spacer bolt. Since the sleeve member is held firmly to the roll shaft member, the sleeve member does not move in the axial direction and does not swing around.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, a continuous annealing furnace 3 is provided immediately upstream of a galvanizing bath 7 in a production line for continuous hot-dip galvanized steel sheets. A large number of conveyor rolls 4 are arranged in the continuous annealing furnace 3 so that the steel strip 2 is conveyed through the furnace toward the plating bath 7. A thermometer 6 is inserted into the heating zone outlet of the continuous annealing furnace 3 . The detection end of the thermometer 6 is located directly below the pass line of the steel strip 2, so that the temperature of the steel strip 2 at the exit of the heating zone can be detected.

A pair of three rolls 10 are provided to sandwich the thermometer 6 from the upstream and downstream sides. These sleeve rolls 10 define the pass line level of the steel strip 2 so that the steel strip 2 does not come into contact with the detection end of the thermometer 6, and are provided to protect the thermometer 6. There is.

As shown in FIG. 1, a ceramic sleeve 11 is inserted into the center of the width of a roll shaft 12 of a sleeve roll 10. As shown in FIG. A uniform and small gap 18 is formed between the ceramic sleeve 11 and the stainless steel roll shaft 12.
It is positioned by the stopper 14, the case 15, and the spacer bolt 17 incorporated in the stopper 14 so that the stopper 14 is opened. Compression coil springs 13 are loosely fitted to roll shafts 12 located on both sides of the sleeve roll 12, respectively. Each compression coil spring 13 is inserted between a pair of stoppers 14, and the outer stopper 14 is tightened with a nut 16. When the nut 16 is tightened, the compression coil spring 13 is biased,
The inner stopper 14 is pressed against the sleeve 11, and the sleeve 11 is pushed by the inner stopper 14 from both sides toward the center of the roll width. In addition, case 15
A part of the sleeve 11 is fitted into the outer end of the sleeve 11. Further, one end of the roll shaft 12 is connected to a drive shaft (not shown) of a motor. Also, compression coil spring 1
The attachment part 3 is located outside the furnace at a relatively low temperature location. In this case, the compression coil spring 13 is
Although it is preferable to provide it on both sides of the roll shaft 12, it does not necessarily have to be provided on both sides and may be provided only on one side.

As shown in FIG. 3, the stopper 14 has at least three or more spacer bolts 17 incorporated in the stopper 14, and the stopper 14 and the roll shaft 12
It is fixed to the roll shaft 12 so that there is a predetermined uniform gap (clearance) 20 between them. The case 15 is inserted into the stopper 11 and fixed with bolts 19. Three
Both ends of the tube 11 are inserted into the case 15 and fixed. These stopper 14, case 15, and spacer bolt 17 are arranged to maintain a predetermined uniform gap 1 between the sleeve 11 and the roll shaft.
8, the axis of the sleeve 11 and the roll axis 12
During use (during main roll rotation), it has the role of fixing the axis so that it does not shift. The ceramic sleeve 11 is made of fused silica ceramic, and has a total length of 1.5 m or more, a diameter of 10 cm or more, and a wall thickness of about 2.5 cm. Next, a case will be described in which the above three roll is actually used in an annealing furnace of a continuous hot-dip galvanizing line.

During the treatment, the temperature at the outlet 5 of the annealing furnace heating zone reaches several hundred degrees Celsius, and each part of the three roll 10 thermally expands. In particular, the amount of elongation in the longitudinal direction of the roll shaft 12 is extremely large, and a difference in elongation occurs between the ceramic sleeve 11 and the roll shaft 12, but the action of the compression coil spring 13 sufficiently eliminates the difference in elongation. Absorbed. Further, the difference in elongation between the two in the radial direction is absorbed by the gap 18.

Although the sleeve roll 10 was rotated at high speed and the steel strip 2 was continuously fed at a desired speed, the ceramic sleeve 11 did not swing around at all even during long-term continuous use. Further, even though the ceramic sleeve 11 was used for more than three months, no cracks occurred at all. This eliminates the need for the line to be stopped due to failure of the three rolls, making it possible to operate stably over a long period of time.

[0016] In the above embodiment, the case where the three roll is used as a protective roll of a thermometer was explained.
The present invention is not limited to this, but is applicable to other rotors in the furnace.
For example, it may be used as a transport roll.

[0017]

[Effect of the invention] According to this invention, ceramic three
Since the swinging of the sleeve can be reliably prevented, damage to the ceramic sleeve due to impact etc. will not occur. Therefore, the equipment operating rate can be improved. Also,
Since the roll replacement frequency is reduced and the roll life is extended, maintenance costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a three-roll according to an embodiment of the invention.

FIG. 2 is a schematic cross-sectional view schematically showing the outlet side of a continuous annealing furnace.

FIG. 3 is a cross-sectional view of a three-roll.

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A sleeve member made of ceramics that contacts a high-temperature conveyed object, a roll shaft member inserted into the sleeve member, and a loose member on at least one side of the roll shaft member. a compression coil spring that is fitted and presses the sleeve member in the axial direction and fixes the sleeve member so as to rotate together with the roll shaft member; and a mutual gap between the sleeve member and the roll shaft member is maintained constant. A three-roll roll comprising: a spacer bolt for holding the roll.