WO2007037244A1

WO2007037244A1 - Hearth roll

Info

Publication number: WO2007037244A1
Application number: PCT/JP2006/319112
Authority: WO
Inventors: Kiyoshi Nishida; Kanji Hirakuri
Original assignee: Chugai Ro Co., Ltd.; Ask Technica Corporation
Priority date: 2005-09-29
Filing date: 2006-09-27
Publication date: 2007-04-05
Also published as: JP2007092148A

Abstract

A hearth roll that realizes maintaining of the surface temperature thereof at appropriate temperature without fluctuation and attainment of high durability. Metal shaft (2) formed so as to allow passage of cooling water therethrough around its circumference is fitted with a laminate of multiple low-thermal-conductivity disks (4) consisting of inorganic fiber boards and multiple high-thermal-conductivity disks (5) consisting of, for example, metal plates, and further fitted with outer tube (8) provided so as to cover the circumferences of the low-thermal-conductivity disks (4) and high-thermal-conductivity disks (5).

Description

Specification

Noro-slo-nore Technical Field

[0001] The present invention relates to a hearth roll used for conveying a high-temperature rolled material.

Background art

[0002] Patent Document 1 describes conventional examples of first to fourth hearth rolls shown in FIGS.

[0003] The hearth roll of the first conventional example shown in 02 (A) is made of a metal outer tube 12 and a support ring 14 provided on the outer periphery of a hollow metal shaft 11 whose inside is cooled by water. 15 is supported, and the outer tube 15 supports and conveys the rolled material. Fig. 2 (B) shows the surface temperature distribution of the hearth roll of the first conventional example. As shown in the figure, the outer tube 15 is cooled only in the portions indicated by the flanges 12, 13 and the support ring 14, and the surface temperature varies greatly.

[0004] The hearth roll of the second conventional example shown in Fig. 3 (A) is obtained by increasing the number of support rings 14 of the first conventional example, but as shown in Fig. 3 (B), the outer tube The temperature variation of 15 cannot be made sufficiently small.

The hearth roll of the third conventional example shown in FIG. 4 (A) is obtained by filling the space between the metal shaft 11 and the outer tube 15 with a heat-resistant mortar 16 instead of the support ring 14. In this third conventional example, since the heat of the central partial force of the outer tube 15 is small, as shown in FIG. 4 (B), a force flange 13 that can keep the temperature substantially constant over a wide range of the outer tube 15. , 14, except for both ends supported by the metal shaft 11, so that the heat can not be dissipated to the cooling water passing through the metal shaft 11. When used in, there was a problem that scale-up was generated and build-up occurred on the surface of the north roll. Further, as shown in the lower side of FIG. 4A, there is a problem that the heat-resistant mortar 16 deteriorates due to use, and the outer tube 15 cannot be supported and deformed.

[0006] Further, in the hearth roll of the third conventional example, instead of the heat-resistant mortar 16, there is a force in which a powder heat insulating material is packed in the space between the metal shaft 11 and the outer tube 15, too. The outer tube 15 with less heat dissipation from the center part becomes too hot and build-up occurs. . Furthermore, since it is difficult to completely fill the powder heat insulating material and to prevent the powder heat insulating material from leaking through the gap between the flange 13 and the outer tube 15, the inner diameter of the outer tube 15 is the same as in the third conventional example. A gap is generated on the side, and deformation of the outer tube 15 cannot be prevented.

[0007] In the fourth conventional example shown in FIG. 5 (A), a large number of discs 17 made of an inorganic fiberboard are used instead of the heat-resistant mortar 16 of the third conventional example. In order to bring the two into close contact, the flange 13 fitted to the metal shaft 11 is fastened with a nut 18 and fixed. In the fourth conventional example, the disc 17 is not deteriorated even if it is repeatedly used, and the outer tube 15 cannot be supported. However, as shown in FIG. 5 (B), if the temperature of the central portion of the outer tube 15 becomes too high and build-up occurs in an acidic atmosphere, the disadvantage is eliminated.

[0008] As shown in Fig. 6 (A), the fifth conventional example, in which the outer tube 15 of the fourth conventional example is omitted, supports the rolled material with a disk 17 of an inorganic fiber plate instead of a metal. As shown in Fig. 6 (B) where the amount of heat transferred is small, the surface temperature can be maintained at an approximately appropriate temperature. However, as shown in the lower side of FIG. 6 (A), the disk 17 of the inorganic fiber board is worn when used repeatedly, so there is a problem that the durability is insufficient!

Patent Document 1: Japanese Patent Laid-Open No. 11-29826

Disclosure of the invention

Problems to be solved by the invention

[0009] As described above, in view of the problems of conventional hearth rolls, an object of the present invention is to provide a highly durable nose roll that can be maintained at an appropriate temperature with a variable surface temperature of V. Means for solving the problem

[0010] In order to solve the above problems, a hearth roll according to the present invention has a plurality of low heat conduction disks and a plurality of high heat conduction disks stacked on the outer periphery of a metal shaft formed to allow cooling water to pass therethrough. It is assumed that the outer tube is fitted so as to cover the outer periphery of the low heat conduction disk and the high heat conduction disk.

[0011] According to this configuration, the outer pipe is supported by laminating the low thermal conductive disk having excellent heat retaining performance and the high thermal conductive disk having excellent cooling capacity, so that the outer pipe is supported while supporting the entire outer pipe. Heat can be taken from multiple points of the pipe and dissipated to the cooling water passing through the metal shaft. Since the outer tube is cooled by being dispersed by a large number of high heat conducting disks, the surface temperature does not vary. Also, By laminating high heat conduction disks with high mechanical strength, the mechanical load on the low heat conduction disks can be reduced and high durability can be obtained.

[0012] Further, in the hearth roll of the present invention, the low thermal conductive disk may be composed of an inorganic fiber board obtained by making inorganic fibers into a plate shape. As a result, the low thermal conductive disk is excellent in heat resistance and durability, has a low thermal conductivity, and can provide a highly durable hearth roll.

[0013] In the hearth roll of the present invention, the high thermal conductive disk can be formed of a metal plate having excellent heat resistance, durability, and workability.

The invention's effect

[0014] As described above, according to the present invention, the outer tube exposed to a high temperature is held by a large number of low heat conductive plates having excellent heat insulation and a large number of high heat conductive disks having excellent cooling properties. The tube can be dispersed and cooled by a number of high heat transfer disks. As a result, it is possible to provide a hearth roll that does not vary in the surface temperature of the outer tube and has high durability.

Brief Description of Drawings

FIG. 1 is a cross-sectional view and a surface temperature distribution diagram of a hearth roll according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view and surface temperature distribution diagram of a first conventional example of a hearth roll.

FIG. 3 is a cross-sectional view and surface temperature distribution diagram of a second conventional example of a hearth roll.

[Fig. 4] Cross-sectional view and surface temperature distribution diagram of third conventional example of hearth roll.

FIG. 5 is a cross-sectional view and surface temperature distribution diagram of a fourth conventional example of a hearth roll.

FIG. 6 is a cross-sectional view and surface temperature distribution diagram of a fifth conventional example of a hearth roll.

Explanation of symbols

[0016] 1 Nosslo Nore

2 Metal shaft

3 Fixed flange

4 Low heat conduction disk

5 High thermal conductivity disk

6 Movable flange

7 Dub Nore Nut 8 Outer pipe

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 (A) shows a hearth roll 1 which is an embodiment of the present invention. The hearth roll 1 has a hollow metal shaft 2 formed so that cooling water can pass inside, a fixed flange 3 fitted and welded to the metal shaft 2, and a binder attached to the ceramic fiber. A number of low-heat-conducting disks 4 made of paper-made inorganic fiber plates fitted on the metal shaft 2 and stainless-steel steel plates distributed and laminated between the low-heat-conducting disks 4 fitted on the metal shaft 2 The high-heat-conducting disk 5 and the fixed flange 3 together with the low-heat-conducting disk 4 and the high-heat-conducting disk 5 and the movable flange 6 with respect to the fixed flange 3 A double nut 7 that presses and fixes the low heat conduction disk 4 and the high heat conduction disk 5 and the outer periphery of the low heat conduction disk 4 and the high heat conduction disk 5 are fitted by tightening to press. One end is fixed by welding to the fixed flange 3. It consists of an outer tube 8 made of SUS310S (equivalent to AISI310S).

In the present embodiment, the thicknesses of the low thermal conductivity disk 4 and the high thermal conductivity disk 5 are all the same. Four low thermal conductive disks 4 and one high thermal conductive disk 5 are arranged alternately, and four low thermal conductive disks 4 are arranged at both ends, so the low thermal conductive disks 4 The total thickness of 4 is slightly larger than about 4 times the total thickness of the high thermal conductive disk 5.

[0019] Fig. 1 (B) shows the surface temperature distribution of the outer tube 8 when the high-temperature rolled material is transported by the hearth roll 1 having the above-mentioned constitutional force. The outer tube 8 is a force at which the temperature at both ends in contact with the fixed flange 2 or the movable flange 6 is lowered. The other portions are maintained at a temperature close to the appropriate temperature.

[0020] The outer tube 8 receives heat substantially uniformly in the axial direction of the rolling material force to be conveyed. The portion of the outer tube 8 that contacts the flanges 3 and 6 or the high thermal conductivity disk 5 is the cooling water that is passed through the metal shaft 2 through the flanges 3 and 6 or the high thermal conductivity disk 5. However, since the low heat conducting disc 4 cannot take heat away from the outer tube 8, the portion of the outer tube 8 that contacts the low heat conducting disc is not cooled directly.

For this reason, as shown in FIG. 1 (B), the surface temperature of the outer tube 8 is a portion in contact with the low thermal conduction disk 4. The height is slightly higher than that of the heat transfer disk 5 and slightly lower than the portion in contact with the high heat conduction disk 5. However, since the high heat conduction disk 5 is a thin plate, the amount of heat released per sheet is limited, and the surface temperature of the outer tube 8 is not greatly reduced locally. In addition, since one high thermal conductivity disk 5 is arranged on the four low thermal conductivity disks 4, the portion of the outer tube 8 in contact with the low thermal conductivity disk 4 is the heat conduction in the outer tube 8. Therefore, the heat can be dissipated indirectly through the high thermal conductive disk 5, and the temperature does not become too high. As a result, the surface temperature of the outer tube 8 is maintained appropriately, and the scale does not build up.

[0022] Since the hearth roll 1 supports the rolled material with the outer tube 8, the low heat conduction disk 4 which is an inorganic fiber plate force without the mind of wear of the low heat conduction disk 4 is stable. Even if it is used repeatedly, it does not deteriorate.

[0023] In addition, in the hearth roll 1 of the present invention, the total thickness of the low thermal conductive disk 4 is larger than the total thickness of the high thermal conductive disk 5, so the cooling capacity of the outer tube 8 by the high thermal conductive disk 5 is In addition, the heat insulation ability of the low heat conduction disk 4 is superior. From this, even when rolled material of 1000 ° C or higher is conveyed, the outer shaft 8 is prevented from being overcooled while the metal shaft 2 is sufficiently cooled to increase the life of the bearing (not shown). The surface of the tube 8 can be maintained at an appropriate temperature.

[0024] A further feature of the hearth roll 1 of the present invention is that the ability to cool the outer tube 8 can be easily adjusted by changing the ratio of the low heat conduction disk 4 and the high heat conduction disk 5. For example, if the number of high heat conducting disks 5 is increased, the surface temperature of the outer tube 8 can be lowered without changing the cooling water and other conditions.

[0025] The surface temperature of the outer tube 8 is low at the part in contact with the high heat conduction disk 5 that is high in the part in contact with the low heat conduction disk 4, but the thin heat conduction disk 4 and the high heat conduction disk 5 that are as thin as possible are used. In addition, the surface temperature can be made substantially uniform by disposing the highly heat conductive disks 5 as dispersed as possible. For this reason, it is preferable to periodically laminate the low thermal conductivity disk 4 and the high thermal conductivity disk 5 in the central portion. As a result, local overheating and overcooling of the outer tube 8 can be prevented, and prediction and adjustment of the surface temperature are facilitated.

[0026] Further, in the hearth roll 1 of the present embodiment, the low heat conduction disk 4 and the high heat conduction disk 5 have the same thickness, but the low heat conduction disk 4 and the high heat conduction disk having different thicknesses. By laminating 5, the high thermal conductive disk 5 may be distributed between the low thermal conductive disks 4. [0027] Further, in the hearth roll 1 of the present invention, the high heat conductive disk 5 is not limited to a stainless steel plate, and other high heat conductive materials such as other metals and graphite expanded sheets can be used.

[0028] In the hearth roll 1 of the present invention, the outer tube 8 is not limited to a metal, and a ceramic crystal sleeve or the like can be used.

Claims

The scope of the claims

[1] A plurality of low heat conduction disks and a plurality of high heat conduction disks are stacked and fitted on the outer periphery of a metal shaft formed to allow cooling water to pass therethrough. A hearth roll characterized in that an outer tube is fitted so as to cover the outer periphery of the conductive disc.

[2] The Nosslo Norre according to claim 1, wherein the low thermal conductive disk is made of an inorganic fiber board.

[3] The no-throw nore according to claim 1 or 2, wherein the high thermal conductive disk has a metal plate force.