JP2000218349A - Slab carrying roller and its assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a tire roller to be arranged in a slab heating furnace of a thin slab mini mill line. SOLUTION: Tires 20 are fittingly fastened at plural positions on an axial element 10 and, heat insulation sleeves 30 are fittingly fastened in areas except for the tire fit fastening part. The heat insulation sleeve 30 is constituted with an anti-heating alloy shell 31 and a heat insulation material 32 filled inside. Side walls of the shell have protrusions 31 and, the tires 20 are equipped with groove holes, into which the protrusions are inserted. The neat insulation sleeves 30 integrally rotate with the axial element 10 by fitting the side wall protrusions into the groove holes of the tires. This roller is assembled by alternately applying a tire fit fastening operation to the roller axial element and a fitting operation of the protrusions into the tire groove holes after the heat insulation sleeves are fit fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire roller used as a slab conveying roller of a slab heating furnace in a slab mini-mill line and a method of assembling the same.

[0002]

2. Description of the Related Art Thin slab mini-mill lines at steelworks include:
A tunnel-type heating furnace for heating a slab supplied from a slab casting facility is installed, and a number of tire rollers are provided as slab transport rollers in the furnace. As shown in FIGS. 8 and 9 (a sectional view taken along the line DD in FIG. 8), the tire roller is provided at a predetermined distance (for example, 1 m) in the axial direction from a roller shaft body (10) made of a heat-resistant alloy. It is composed of a tire (20) fitted and fixed to the roller shaft (10), and a heat insulating material layer (34) covering the peripheral surface of the shaft.

[0003] The tire (20) comprises an annular tire body (21) made of a heat-resistant alloy and a pedestal (22) made of a heat-resistant alloy for supporting the same. Tyre cradle (22)
Are fixed to a plurality of places (three places in the figure) at equal intervals in the circumferential direction of the roller shaft body (10) by welding or the like.
1) is carried on a receiving stand (22) and held concentrically with the roller shaft (10). The transported slab (S) (about 50 to 90 mm in thickness) is transported in the furnace while being held on the circumferential surface of the tire body (21).

[0004] The heat insulating layer (34) is covered on the peripheral surface of the shaft except for the part where the tire (20) is fitted, because the high temperature oxidizing atmosphere (usually about 1000 ° C or more) in the furnace. Failure due to contact (deformation of roller shaft, oxidation wear, etc.)
This is to prevent suppression. The heat insulating material layer (34) is formed by coating an irregular refractory such as a castable on a peripheral surface of a roller shaft (10) in which a stud (34) having a V-shape or a Y-shape is implanted by welding or the like. It is formed by drying and solidifying.

[0005]

The problem with the actual use of the transport roller is that the slab or slab scale contacts the heat insulating material layer (34) covering the peripheral surface of the roller shaft (10). And peeling, falling off, etc., due to vibration, impact, etc. When the heat insulating material (32) peels off or falls off, the shaft body (10) is oxidized and worn or deformed.
This causes a reduction in the service life of the transport roller, an increase in the maintenance burden, and a reduction in furnace operation efficiency. As a countermeasure, as shown in FIG.
It has been proposed that a cylindrical cover (60) be put on the outer surface of the device (Japanese Patent Laid-Open No. Hei 10-216912).
The cover (60) includes a tubular member (61) made of a heat-resistant alloy and a donut-shaped side plate (63) attached to both end edges thereof.
The cylindrical member (61) is mounted on the heat insulating material layer (34) by covering the outer peripheral surface of the heat insulating material layer (34) and welding the side plates (63) to both end edges thereof.

However, the operation of coating the heat insulating material layer (34) on the peripheral surface of the roller shaft body (10) and covering the cover with the heat insulating layer (34) is extremely complicated and troublesome in tire tire roller assembly and manufacturing operations. Be inefficient. That is, prior to the application of the heat insulating material layer (34), the stud (32)
Welding is a complicated operation in itself, and is also an operation of assembling the cover (60) after applying the heat insulating material layer (34) and drying the heat insulating material layer (34). And welding the side plate (62) to this) is an extremely troublesome operation.

Further, a tire (2) is attached to the roller shaft (10).
0) and the operation of forming the heat insulating material layer (34) and mounting the cover (60) need to be performed alternately [the diameter of the tubular member (61) of the cover, the side plate ( 62) is smaller than the outer diameter of the tire (20) and cannot pass through the tire (20) when moving in the axial direction]. The tire roller manufacturing process requires a long waiting time for the applied heat insulating material layer (34) to dry, and thus the tire (2)
The interruption time between the execution of the fitting and fixing operation of 0) and the execution of the forming operation of the heat insulating material layer (34) is significantly long. This significantly reduces the efficiency of the manufacturing process of the tire roller and greatly increases the manufacturing cost. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems relating to the slab transport roller.

[0008]

According to the present invention, a plurality of tires (20) carrying a slab are provided on a roller shaft (10).
A heat insulating sleeve (30) surrounding a shaft peripheral surface of a region of the roller shaft (10) other than a tire-fitting portion in the slab conveying roller fixedly mounted at a plurality of positions in the axial direction of the roller.
Are alternately fitted with the tire (20) along the axial direction, and the heat insulating sleeve (30) is concentrically opposed to define an inner space with an inner cylindrical wall (31a) and an outer cylindrical wall (31b). ) And a heat-resistant alloy shell (31) composed of a side wall (31c) for closing the opening ends on both sides thereof, and a heat insulating material (32) filled in the inner space thereof, and the circumferential direction of the side wall (31c) is increased. Tires (20) at multiple locations
The tire (20) fixed to the roller shaft (10) has a projection (311) protruding toward the side surface of the tire (20). Is provided, and the heat insulating sleeve (3) is provided.
In (0), the protrusion (311) on the side wall is fitted in the slot (24) of the tire (20), and surrounds the shaft peripheral surface.

The slab conveying roller according to the present invention is characterized in that the tire (20) is fitted to the roller shaft (10) and fixed at a predetermined position in the axial direction, and the heat insulating sleeve (30) is fitted. Then, the protrusion (311) on the side wall is inserted into the slot (2) on the side surface of the tire (20) fixed to the roller shaft.
The heat insulating sleeve mounting operation consisting of fitting in 3) is performed alternately along the axial direction of the roller shaft body.

The slab conveying roller of the present invention includes a heat insulating sleeve (30) in which a heat insulating material (32) is included in a shell (31) as heat insulating protection means for the roller shaft (10) against a high temperature atmosphere in the furnace. And the roller shaft (10), it is possible to prevent the heat-insulating material from peeling and falling off and the loss and deterioration of the heat-insulating protection effect. Thus, the deterioration of the roller shaft (10) due to the high-temperature oxidizing atmosphere in the furnace is suppressed and prevented, and the service life thereof is increased.

Also, assembling the slab transport roller according to the present invention, as in the roller structure of FIG. 8 described above, the tire ( The inefficient work of repeating the fitting and fixing operation of 20) is released, and the fitting and fixing of the tire (20) to the roller shaft (10) and the fitting of the heat insulating sleeve (30) are interrupted. It can be repeated continuously without performing.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments. FIG. 1 shows an axial cross section (a cross section taken along the line BB in FIG. 4) of the slab conveying roller of the present invention. The roller shaft (10) has tires (20) and heat insulating sleeves (30) mounted alternately in the axial direction. FIG. 2 is a side view of the heat insulating sleeve (30), and FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG.
Is a side view of the tire (20), and FIG. 5 is a cross-sectional view taken along the line CC of FIG.

The heat insulating sleeve (30) is shown in FIGS.
As shown in the figure, the inner cylindrical wall (31a) and the outer cylindrical wall (3
1b) are concentrically opposed to each other to form an annular internal space, the open ends of both sides of which are closed by side walls (31c), a shell (31), and a heat insulating material (32) filled in the internal space. It is composed of The shell (31) is made of a suitable heat-resistant alloy (for example, SUS) that can withstand the high-temperature environment in the furnace.
310S is formed of steel. As the heat insulating material (32) filled in the shell (31), ceramic fibers (for example, alumina, silica, zinc oxide, etc.) are preferably used. In addition, on the inner side surface of the inner cylindrical wall (31a) or the outer cylindrical wall (31b) of the shell (31), the heat insulating material (32) filled in the inner space is stably held.
Studs (V-shaped, Y-shaped, etc.) are provided (in the example of the figure, formed on the inner side surface of the inner cylindrical wall 31a).

The side wall (3) of the shell of the heat insulating sleeve (30)
1c), the projections (311) are formed at a plurality of circumferential positions (three positions having a central angle of 120 °) on the outer surface thereof. The protrusion (311) is inserted into the slot (23) of the tire (20) to form a connection between the tire (20) and the heat insulating sleeve (30) (FIGS. 1, 3).

The insulation sleeve (30) is manufactured, for example, as a welded assembly. Two cylindrical bodies having different diameters, which are the inner cylindrical wall (31a) and the outer cylindrical wall (31b) of the shell (31), and a donut board having a projection (311) serving as the side wall (31c) are prepared. Then, two cylindrical bodies are stacked concentrically, a heat insulating material is loaded in the inner space, and a donut board-like plate material is put on the opening edge and welded.

As an alternative method of manufacturing the heat-insulating sleeve (30), a heat-resistant alloy shell (31) is manufactured as a cast-in-cast body in which a heat insulating material (32) is included using a lost form process. can do. This will be described with reference to FIGS. FIG. 6 shows a foam model formed of a foam material (foam polystyrene resin or the like). The foam model (40) has an inner cylinder (41).
a), an outer cylinder (41b), and a donut-shaped cover plate (41c).

A projection (42) corresponding to the stud (32) is implanted on the inner peripheral surface of the inner cylinder (41a), and a projection of the heat insulating sleeve (30) is disposed on the outer surface of the lid plate (41c). A projection (411) corresponding to (311) is provided. The inner cylinder (41a) and the outer cylinder (41b) concentrically face each other to form an annular space. A lid plate (41c) is bonded to one of the opening ends with an adhesive to form a bottomed double cylinder. A heat insulating material (32) prepared separately is loaded into the inner space, and a cover plate (41c) is put on and bonded with an adhesive.

As shown in FIG. 7, a foam model (40) including a heat insulating material is embedded in a casting sand (51) to form a disappearing model mold (50). If a heat-resistant alloy melt is poured into this, the foam model disappears due to the thermal action of the melt, and the space is filled with the alloy melt. As a result, a cast-in-cast body in which the heat insulating material (32) is included in the shell (31) made of a heat-resistant alloy is formed. The outer surface of the cast-in-place casting is subjected to finish machining to obtain an insulating sleeve (30).
According to the cast-in-place casting method, a heat insulating sleeve (30) having a good shape and structure can be efficiently manufactured.

The tire (20) is a tire body (2).
1) and a cradle (22) for carrying the same, and the tire cradle (22) is provided with a slot (23) oriented substantially parallel to the roller shaft (FIGS. 4 and 5). . The configuration of the tire (20) does not differ from that of FIG. 10 except that it has a slot (23). Tyre cradle (22)
Are arranged at equal intervals in the circumferential direction of the roller shaft (10) (in the figure, three at a central angle of 120 ° as one set), and the periphery of the shaft is welded. It is fixedly attached to the surface. Tire body which is an annular member (21)
Is carried by the receiving stand (22), and the receiving stand (2) is welded or the like.
Fixed to 2).

The tire (20) fitted and fixed to the roller shaft (10) has a slot (23) opened on the side surface thereof.
The protrusion (311) of the heat insulating sleeve (30) is inserted (FIGS. 1 and 3). In the conveying roller of FIG. 9, the cover (60) of the heat insulating material layer (34) is rotated so that the cover (60) rotates integrally with the roller shaft (10).
0) or a key and a keyway must be provided between the cover (60) and the tire (20). Unlike this, the transport roller of the present invention does not require such a complicated treatment. Heat insulation sleeve (30)
This is because the transmission of the rotational torque to the heat insulating sleeve (30) is ensured by the fitting relationship between the protrusion (311) and the slot (23) of the tire (20).

The assembling work of the slab conveying roller according to the present invention includes: mounting the tire (20) at a predetermined position in the axial direction of the roller shaft (10);
A heat insulating sleeve (30) is fitted on the roller shaft (10),
The side wall projection (311) is inserted into the slot (2) of the tire (20).
The mounting of the heat insulating sleeve, which is to be fitted in the step 3), is performed alternately and repeatedly along the axial direction of the roller shaft body (10). The roller shaft (1)
In order to prevent axial displacement of the heat-insulating sleeve (30) and to protect the outer surface of the shaft surface from being covered with the auxiliary heat-insulating sleeve (3) as shown in FIG.
0 ') is fitted as necessary, and an appropriate stopper (70) is fixed to the outside thereof.

The roller assembling operation of the present invention is performed in the same manner as in the case of manufacturing the roller shown in FIG.
It does not require a long waiting time for coating and drying, and unlike the roller structure shown in FIG. 9, a complicated and long operation such as welding for fixing the heat insulating sleeve (30) is performed. do not need. That is, the tire mounting operation and the heat insulating sleeve mounting operation can be repeatedly performed without interruption.

[0023]

The roller for conveying slab of the present invention has a structure in which a heat insulating material for protecting the shaft from the high-temperature atmosphere in the furnace is contained in a heat-resistant alloy shell. The fixing work of the tires and the fitting work of the heat insulating sleeve can be repeatedly performed without interruption, the mounting operation of the heat insulating sleeve is easy, and no complicated work such as welding is required. The manufacturing process is more efficient, and the manufacturing cost can be significantly reduced. In addition, since the heat insulating material is included in the heat-resistant alloy shell, damage such as peeling and falling off during the use of the actual machine is suppressed and prevented, and the protective effect of the coating is stably maintained. Effects such as reduction of maintenance and improvement of furnace operation efficiency are provided.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention (B in FIG. 4);
-B sectional view).

FIG. 2 is a side view showing a heat insulating sleeve of the transport roller of the present invention.

FIG. 3 is a cross-sectional view of the heat insulating sleeve of FIG.

FIG. 4 is a side view showing a tire of the transport roller of the present invention.

5 is a cross-sectional view of the tire shown in FIG.

FIG. 6 is a perspective view showing a foam model used for vanishing model casting in which the heat insulating sleeve of the present invention is manufactured as a cast-in casting.

FIG. 7 is a view showing the molding of a vanishing model casting mold using the foam model of FIG. 7;

FIG. 8 is a partially cutaway sectional view showing a conventional slab conveying roller.

FIG. 9 is a sectional view taken along the line DD in FIG. 8;

FIG. 10 is an axial sectional view showing another example of a conventional slab transport roller.

[Explanation of symbols]

 10: Shaft 20: Tire 21: Tire main body 22: Tire main body support 24: Slot hole 30: Heat insulation sleeve 31: Shell (heat-resistant alloy) 31a: Inner cylindrical wall 31b: Outer cylindrical wall 31c: Side wall 311: Horizontal projection 32 : Stud 33: heat insulating material 34: heat insulating material layer 40: foam model 41 a: inner cylindrical part 41 b: outer cylindrical part 41 c: side plate 411: horizontal projection 42: projecting piece 50: vanishing model mold 51: molding sand 60: heat insulating material layer 61: tubular member 62: side plate

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[Procedure amendment]

[Submission date] February 1, 1999 (1999.2.1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 5

FIG. 7

FIG. 9

FIG. 4

FIG. 6

FIG. 8

FIG. 10

Claims (4)

[Claims] A plurality of tires (2) carrying a slab
0) surrounds the shaft peripheral surface of the roller shaft body (10) in a region other than the tire-fitted portion of the roller shaft body (10) in the slab conveying roller fitted and fixed at a plurality of positions in the axial direction. A heat insulating sleeve (30) is alternately fitted with the tire (20) along the axial direction. The heat insulating sleeve (30) concentrically faces the inner cylindrical wall (31a) defining an internal space. Outer cylindrical wall (3
1b) and side walls (31) closing the open ends on both sides thereof
c), and a heat insulating material (32) filled in the inner space thereof, and tires (20) are provided at a plurality of circumferential positions on the side wall (31c).
The tire (20) having a projection (311) protruding toward the side surface of the tire (20) fixed to the roller shaft (10)
A slot (24) into which the protrusion (311) of the heat insulating sleeve is inserted is provided on the side surface, and the heat insulating sleeve (30) has a protrusion (311) on the side wall and a groove (24) of the tire (20). A slab conveying roller fitted around the shaft body and surrounding the shaft body. 2. A heat-insulating sleeve (30) that concentrically faces the inner cylindrical portion (41a) and the outer cylindrical portion (41b) that define an internal space, and a horizontal projection (411) that closes the openings at both ends thereof. A foam model (40) in which a heat insulating material (32) is filled in the internal space of a housing made of a foam material, which comprises a side plate (41c) provided with
The slab-conveying roller according to claim 1, wherein the slab-conveying roller is a cast-in-place cast body formed by vanishing model casting. 3. The tire (20) includes a roller shaft (10).
Tire cradle (2)
2) and a tire main body (21) having an annular shape held by the tire cradle (22), and the slot (24) into which the protrusion (311) of the heat insulating sleeve is inserted into the tire cradle (22). The roller for conveying a slab according to claim 1, wherein 4. A tire (20) attached to the roller shaft (10).
Tire mounting work for fitting and fixing the heat insulating sleeve, and a heat insulating sleeve for fitting the heat insulating sleeve (30) and fitting the side wall projection (311) into the slot (23) of the tire (20) fixed to the roller shaft. The method for assembling a slab transport roller according to any one of claims 1 to 3, wherein the mounting operation is performed alternately along the axial direction of the roller shaft body.