JP2003013945A - Sleeve type roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve type roll suitable for a short side roll, having a sufficient long life, an excellent dust proofness, a moisture preventive characteristic, and a lubricant leakage preventive characteristic even if an internal cooling by circulation of a cooling water is not carried out and usable in a high temperature and high humidity. SOLUTION: The sleeve type roll is constituted of (1) a bearing shaft, (2) a rotary body 28, and (3) a heat resistant material and has stepwise a thick wall part 30a and a thin wall part 30b having a larger inside diameter than the thick wall part 30a, a holding member 30 having a gap between the rotary body and the bearing shaft 27 and installed on the internal face of the rotary body 28, (4) a main body part 31a held by the holding member and a slip part 31b sealing a gap between the bearing shaft 27 and the rotary body 28 by touching the outside face of the bearing shaft 27 flexibly. The main body part 31a is held by the level difference part of the thick wall part 30a and the thin wall part 39b, and further, a sleeve type roll 25b is provided with a circular first seal member 31 in which the thin wall part has the larger inside diameter than the outside diameter of the main body part 31a, and a circular second seal member 32 disposed while being brought into contact with (5) the end of the rotary body 28 and the first seal member 31 respectively.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sleeve type roll. Specifically, the present invention has a sufficiently long life without performing internal cooling by circulating cooling water, and has both excellent dustproofness, moistureproofness, and lubricant leakage prevention, for example, The present invention relates to a sleeve-type roll that can be suitably used as a short-side roll used in a hot and humid environment immediately below a mold of a continuous casting machine.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view schematically showing a situation in which a continuous casting machine 1 continuously casts a slab.
As shown in the figure, molten steel (indicated by an arrow in the figure) is cast into the mold 3 from the immersion nozzle 2 and cooled to form a cast piece 4. The slab 4 is continuously installed in the vicinity of immediately below the mold, and a pair of long-side rolls 5a to 5f that are continuously installed in a drawing direction from immediately below the mold and contact two flat surfaces of the slab 4. The cooling water jet nozzles 7a to 7c are guided by a pair of short side rolls 6a to 6c contacting the side surface of the slab 4.
Cooling water is sprayed from 7c and is withdrawn while further cooled to obtain a continuously cast slab.

The long side rolls 5a to 5f are partially driven rolls for pulling out the slab 4, while the short side rolls 6a to 6c are used at a stage where the solidified shell of the slab 4 is thin. A non-driving roll is used because it is used in a state where the pressure received from the slab 4 is small for the purpose of preventing breakout and improving the internal quality of the slab short side shape.

FIG. 4 is an explanatory diagram showing an example of the relationship between the structures of the long-side rolls 5a to 5f and the short-side rolls 6a to 6c, the bearing temperature, and the actual number of charges until roll replacement.

As shown in FIG. 4, long side rolls 5a to 5f
Each of the short side rolls 6a to 6c is a sleeve type roll including a support shaft 8 fixedly arranged and a cylindrical roll 9 rotatably arranged around the support shaft 8 apart from the support shaft 8. To be done. Therefore, the long side rolls 5a to
5f and the short-side rolls 6a to 6c, respectively, two bearings 10 are mounted between the support shaft 8 and the rolls 9, and seals for preventing foreign matter from entering the bearings 10 and 10. The members 11 and 12 are also mounted.

By the way, the long-side rolls 5a to 5f and the short-side rolls 6a to 6c all come into direct contact with the slab 4 having a high temperature close to 1000 ° C., so that the temperature naturally rises. Seal members 11, 1 caused by this temperature rise
Cooling the inside of each roll is effective for preventing damage and deterioration of the rolls 1, 12, 12.

In the case of the long side rolls 5a to 5f, the bearing 1
By increasing the cooling performance by providing the cooling water flow path 13 in the vicinity of 0, the temperature of the bearing 10 can be suppressed to 70 ° C. or less, which is significantly lower than the allowable upper limit temperature of the commercially available industrial heat-resistant rubber. Therefore, the seal member 11 of the bearing 10 can be made of industrial heat-resistant rubber,
As a result, the durability (number of times of use) of the seal member 11 is 2
The life can be extended to more than 400 charges.

On the other hand, in the case of the short side rolls 6a to 6c,
It is necessary to follow the width change of the short side of the mold, and because the short side dimension is small, it is not possible to secure the installation space for the cooling water flow path, so the cooling water flow path cannot be provided inside, and the bearing 1
The temperature of 0 rises to about 200 ° C., which is higher than the allowable upper limit temperature of commercially available industrial heat-resistant rubber. For this reason, the seal member 12 cannot be made of a commercially available industrial heat-resistant rubber, and it is necessary to use a metal seal member 12 such as a piston ring or a labyrinth. Even if these metallic seal members 12 are used, the mold 3 shown in FIG.
In the case of the short side roll 6a which is horizontally arranged immediately below,
By supplying the grease between the support shaft 8 and the roll 9 without interruption, it is possible to suppress the wear of the seal member 12 to the extent that there is no practical problem, and it is possible to realize a long life of, for example, 2400 charges or more.

Further, in Japanese Patent Laid-Open No. 11-11638, water and dust are prevented from entering the roll bearing portion in the continuous casting equipment from the outside, contamination of the roll shaft and the bearing and generation of rust are prevented, and high temperature In order to effectively prevent heat conduction from the roll exposed to the conditions and avoid wear of the seal or the roll shaft part, the roll is rotatably supported via a bearing on the fixed shaft of the dust seal roll mechanism. A dust seal roll mechanism in which a wiper is provided between the roll and a roll via a heat insulating ring is disclosed.

[0010]

However, as a result of further investigations by the present inventors, the short-side rolls 6b and 6c have been obtained.
When used, scale and water enter the bearing 10 of No. 3 at an early stage, and the short-side rolls 6b and 6c have a long life of the long-side rolls 5a to 5c.
It was found that it was considerably shorter than not only 5f but also the short side roll 6a.

That is, as shown in FIG. 3, the short side rolls 6b and 6c are arranged at right angles regardless of the curve of the slab 4. In the seal member 12, the scale is easily rolled up, the contact surface is worn, and the scale and water enter the bearing 10 at an early stage, and the life of the bearing 10 is shortened.

FIG. 5 is an explanatory diagram showing the results of analytical ferrography of the lubricant supplied to the short side rolls 6b and 6c in which the abnormal wear of the bearing 10 has occurred. As shown in the figure,
The lubricant supplied to the short side rolls 6b and 6c includes iron oxide (Fe ₂ O ₃ · Fe ₃ O ₄ ) and non-ferrous metal particles (SiO ₂
Etc.) and other contaminants are mixed. Here, iron oxide (Fe ₂ O
₃ · Fe ₃ O ₄ ) is flaky with a particle size of about 0.5 to 100 μm and has a smooth surface. On the other hand, non-ferrous metal particles (SiO ₂ etc.) have a particle size of 200 × 100 μ.
It is a lithographic plate of about m and has a rough surface.
When the heat treatment is carried out under the condition of × 90 sec, a blue temper color is shown. Therefore, it can be seen from the result (see Table 1) of the material determination of the wear particles by the temper color (treatment time 90 sec).

[0013]

[Table 1]

Therefore, the short side rolls 6b and 6c are not lubricated.
The good reason is that the seal member 12 is hardened due to the temperature rise.
Of the iron oxide (Fe₂O₃・
Fe ₃O_Four) And non-ferrous metal particles (SiO₂Etc.) etc.
It is thought that this is due to the inclusion of.

Therefore, the life of the seal member 12 is 1
When the number of charges was less than 200, the life was extremely short compared with not only the long side rolls 5a to 5f but also the short side roll 6a. Further, since the seal member 12 is attached to the roll 9, the seal member 12 rotates away from the slab 4 as a heat source by rotating together with the roll 9, and repeatedly approaches the slab 4 after being cooled. It is expected that the life will be extended even if the temperature exceeds 200 ° C to some extent. However, since the short-side rolls 6b and 6c are not driven, the radiant heat from the slab 4 may concentrate on the same location for a long time without rotating depending on the distance from the slab 4. However, in this case, a part of the seal member on which the radiant heat is concentrated and acts will be damaged.

Further, in the invention disclosed in Japanese Patent Application Laid-Open No. 11-11638, the heat insulating ring arranged between the fixed shaft and the roll is severely worn and has a short life. Therefore, the invention disclosed in Japanese Patent Laid-Open No. 11-11638 is difficult to carry out on an industrial scale.

An object of the present invention is to provide a sleeve type roll, specifically, it has a sufficiently long life without internal cooling by circulating cooling water, and has excellent dustproofness, moistureproofness and lubrication. It is to provide a sleeve-type roll that can be suitably used as a short-side roll used in a hot and humid environment immediately below the mold of a continuous casting machine because it has both agent leakage prevention properties. .

[0018]

SUMMARY OF THE INVENTION The present invention comprises a support shaft fixedly arranged, and a tubular rotating body rotatably arranged around the support shaft apart from the support shaft. An annular holding member that is mounted on the inner surface of the rotating body with a gap between it and the shaft, and a space held between the supporting shaft and the rotating body by being held by the holding member and contacting the outer surface of the supporting shaft. It is a sleeve type roll provided with the annular 1st seal member which seals.

In the sleeve-type roll according to the present invention, the first seal member is flexible and comes into contact with the outer surface of the support shaft by the main body part held by the holding member so that the support shaft and the rotary shaft are rotated. It is desirable to have a lip that seals the space between the bodies. In this case, the holding member has a thick portion and a thin portion having an inner diameter larger than that of the thick portion, and the main body is held by the step portion of the thick portion and the thin portion. It is illustrated that the inner diameter of the is larger than the outer diameter of the main body.

In the sleeve type roll according to the present invention, it is desirable that the holding member is made of a heat insulating material. In these sleeve type rolls according to the present invention, it is desirable that the support shaft has a lubricant supply passage to the space between the support shaft and the rotating body. In this case, the first convex member further prevents the lubricant supplied to the space between the support shaft and the rotating body from leaking to the outside by contacting the outer surface of the support shaft. It is desirable to have an installation.

It is desirable that these sleeve-type rolls according to the present invention further include an annular second seal member that is arranged in contact with the end portion of the rotating body and the first seal member.

In these sleeve type rolls according to the present invention, it is desirable that the first seal member further has a second protruding portion that comes into contact with the second seal member. Furthermore, in these sleeve type rolls according to the present invention,
It is desirable that the cooling liquid is used while being jetted to at least the second seal member.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a sleeve type roll according to the present invention will be described below in detail with reference to the accompanying drawings. In the following description, the sleeve type roll according to the present invention is applied to a short side roll of a continuous casting machine as an example.

FIG. 1 is a schematic view of a state in which the sleeve type roll of this embodiment is applied to the short side rolls 25a to 25c of a continuous casting machine 20 for continuously casting a slab by partially enlarging and extracting it. FIG.

As shown in the figure, molten steel (indicated by an arrow in the figure) from the immersion nozzle 21 is cast into a water-cooled copper mold 22 and cooled to form a slab 23. A large number of slabs 23 are continuously installed in the drawing direction from immediately below the mold 23, and a pair of long-side rolls 24 a to 24 f that come into contact with two flat surfaces of the slab 23 are continuously installed in the vicinity of immediately below the mold 23. And is guided by a pair of short side rolls 25a to 25c abutting on the side surface of the cast piece 23, the cooling water is jetted from the cooling water jet nozzles 26a to 26c, and is drawn while being further cooled. It is said that

Since the long side rolls 24a to 24f receive a large pressure from the cast slab 23, they are connected to a drive mechanism (not shown) and arranged as drive rolls. On the other hand, the short side rolls 25a to 25c are used in a state in which the pressure received from the slab 23 is small for the purpose of preventing breakout when the thickness of the solidified shell of the slab 23 is thin, so that the drive mechanism is It is not provided and is arranged as a non-driving roll.

Long side rolls 24a to 24f, short side roll 2
Both 5b and 25c are arranged horizontally regardless of the curve of the slab 23. In addition, long side rolls 24a to 24
Each of the f and the short side rolls 25a to 25c is rotatably supported by a well-known and commonly used support frame (not shown) about its central axis as a rotation center.

In the present embodiment, the long side rolls 24a-24
As shown in FIG. 4 described above, f is a support shaft 8 fixedly arranged by the above-mentioned support frame (not shown), and a cylindrical roll 9 rotatably arranged around the support shaft 8 apart from the support shaft 8. , Long side rolls 5a to 5f and short side rolls 6a to 6
c A sleeve type roll having two bearings 10 inside each of them, between the support shaft 8 and the roll 9, and a seal member 11 for preventing foreign matter from entering the bearings 10 and 10. And is well known and conventional. Therefore, in the present specification, further description of the long side rolls 24a to 24f will be omitted.

Next, the short side rolls 25a to 25c will be described. As described above, the short side rolls 25a to
Since 25c has the same configuration, the following description will be given by taking the short side roll 25b as an example.

As shown in the enlarged view of FIG. 1 in which the short side roll 25b is extracted and enlarged, and the sectional view showing a part of the AA cross section in this enlarged view, respectively, the short side used in this embodiment. The side roll 25b is a sleeve-type roll having a support shaft 27, a rotating body 28, a bearing 29, a holding member 30, a first seal member 31, and a second seal member 32. Hereinafter, these constituent elements of the short side roll 25b will be sequentially described.

[Support Shaft 27] In this embodiment, the support shaft 2
A round bar was used as 7. The support shaft 27 is fixedly arranged by the support frame described above. In addition, in the present embodiment, a lubricant supply passage 27a is provided which penetrates the central portion from one end surface of the support shaft 27 and which exits to the outside at a substantially central portion in the longitudinal direction.

A lubricant supply mechanism (not shown) is connected to the lubricant supply passage 27a so that the lubricant (grease) can be supplied to the outer surface of the support shaft 27 near the outer surface at the substantially central portion in the longitudinal direction. Has been done.

In this embodiment, the support shaft 27 is constructed as described above. [Rotating Body 28] A sleeve-shaped roll, which is a cylindrical rotating body 28, is arranged around the support shaft 27 so as to be rotatable away from the support shaft 27. The rotating body 28 is rotatably supported by two bearings 29 arranged on the outer peripheral surface of the support shaft 27. The outer peripheral surface of the rotating body 28 contacts the surface of the continuously cast slab 23, whereby the support shaft 27
The rotating body 28 rotates with respect to.

Since the rotating body 28 comes into contact with the slab 23 having a high temperature of about 1000 ° C., it is a steel roll. In this embodiment, the rotating body 28 is configured as described above.

[Bearing 29] As the bearing 29, a well-known and commonly used bearing generally used for industrial purposes is used. The bearing 29 is
The support shaft 27 is provided at two locations separated from each other in the axial direction.

In this embodiment, the bearing 29 is constructed as described above. [Holding Member 30] In the present embodiment, as described later, the first sealing member 31 is made of rubber in order to improve the sealing performance of a conventional sleeve type roll using a metal seal such as a piston ring. However, since the rotating body 28 is a steel roll having good thermal conductivity, the first surface is formed on the inner surface of the rotating body 28.
If the first seal member 31 is directly attached, the first seal member 31 will exceed its allowable temperature and will be destroyed. Therefore, in the present embodiment, various measures are taken to insulate the first seal member 31 so that the first seal member 31 can be used at or below the allowable temperature without internal water cooling.

First, the ring-shaped holding member 3 is provided on the inner surface of the rotating body 28 at both ends thereof with a gap between the supporting member 27 and the support shaft 27.
Wear 0 and 30. The holding member 30 has a thick portion 30a and a thin portion 30b having an inner diameter larger than that of the thick portion 30a in a step shape. Thick part 30a and thin part 30b
Is integrally formed of, for example, ceramics, a metal material and ceramics or a heat insulating material such as cement or heat-resistant resin. In the present embodiment, the first seal member 31
Is a rotating body 28 via a holding member 30 made of a heat insulating material.
Therefore, the temperature rise of the first seal member 31 is significantly suppressed.

Secondly, a first sealing member 31 described later is mounted on the stepped portion of the thick portion 30a and the thin portion 30b, and the inner diameter of the thin portion 30b is the main body portion 31a of the first sealing member 31. It is set larger than the outer diameter of.

As a result, a gap 33 is formed between the holding member 30 and the first seal member 31. In the present embodiment, the distance of the gap 33 in the radial direction (vertical direction in the sectional view in FIG. 1) is about 3 mm.

By having the gap 33, the holding member 3
The contact area between 0 and the first seal member 31 is reduced, and the thermal influence (temperature rise) of the bearing 29 is suppressed. That is,
Due to this gap 33, the first seal member 31 is cooled by repeated outflow of grease, and the heat conduction distance from the rotating body 28 is lengthened. Therefore, the temperature of the rubber first seal member 31 is not higher than the allowable value. When approaching the temperature, the rotating body 28 is cooled away from the heat source due to its rotation.
Further, this portion is the cooling water injection nozzle 2 in FIG.
Since it is the portion to which the cooling water sprayed from 6a to 26c is applied, it is inevitably water-cooled.

The holding member 30 is arranged such that the side surface of the thick portion 30a is in contact with the side surface of the bearing 29. As a result, the rotating body 28 is accurately positioned in the longitudinal direction of the support shaft 27.

Therefore, in the present embodiment, the first seal member 31 is reliably suppressed to a temperature below the allowable temperature thereof even without internal water cooling. In this embodiment, the holding member 30 is configured as described above.

[First Seal Member 31] In this embodiment, the first seal member 31 is attached to the stepped portion of the holding member 30. The first seal member 31 is made of, for example, industrial general-purpose heat-resistant rubber such as fluororubber or resin, and is attached to the stepped portion of the holding member 30 and has a body portion 31a having a substantially L-shaped cross section and a flexible portion. And a lubricant supply path 2 that has a property of contacting the outer peripheral surface of the support shaft 27 to seal the gap between the support shaft 27 and the rotating body 28.
A grease stopper lip 31c, which is a first projecting portion, which extends the life of the first seal member 31 by preventing the lubricant supplied between the support shaft 27 and the rotating body 28 from 7a from leaking to the outside. , And a second protruding portion 31d that comes into contact with a second seal member 32 described later.

Further, in this embodiment, the first seal member 31 rotates around the support shaft 27 fixedly arranged together with the rotating body 28. Therefore, the annular first seal member 3
1 are provided with notches (not shown) in the circumferential direction at four locations on the circumference, and the stepped portion of the holding member 30 has protrusions (not shown) that fit into these four notches. Four) are provided, and the first seal member 31 is fixed to the holding member 30 in the circumferential direction. As a result, even if the rotating body 28 rotates, the first seal member 31 is prevented from slipping and idling with respect to the holding member 30.

As described above, the first seal member 31 is held by the holding member 30 and abuts on the outer peripheral surface of the support shaft 27, thereby sealing the space between the support shaft 27 and the rotating body 28.

In this embodiment, the first seal member 31 is constructed as described above. [Second Seal Member 32] The end face of the rotating body 28 and the second protruding portion 31d of the first seal member 31 are brought into contact with each other to form an annular second seal member 3 which is an end plate.
2 is a rotating body 2 by appropriate means (for example, screwing).
It is fixedly arranged at 8.

Like the first seal member 31, the second seal member 32 is made of industrial general-purpose heat-resistant rubber or resin such as fluororubber. Further, as described above, the second seal member 32 is a portion to which the cooling water sprayed from the cooling water spray nozzles 26a to 26c in FIG. As a result, in the present embodiment, the first seal member 31 is also cooled from the abutting second seal member 32, and is reliably suppressed to a temperature equal to or lower than its allowable temperature without performing internal water cooling.

In this embodiment, the second sealing member 32
As described above, is configured so that the heat load from the rotating body 28 does not act on the first seal member 31 and the bearing 29.

Thus, the support shaft 27 and the rotating body 28
, Bearing 29, holding member 30, and first seal member 3
When the sleeve type roll of this embodiment having the first seal member 32 and the second seal member 32 is used as the short side roll 25b of the continuous casting machine 20 in FIG. 1 while supplying the lubricant therein, the effects listed below are obtained. Is played. (I) The short side roll 25b has a cooling water jet nozzle 26a.
Since the cooling water sprayed from ~ 26c is applied and cooled, the gap 33 is provided, and since the second seal member 32 is further provided, the heat input amount to the first seal member 31 is reduced, The temperature rise of the first seal member 31 is reduced by about 20 to 45 ° C., and the temperature of the first seal member 31 during use can be suppressed to 200 ° C. or lower which is the allowable temperature. Therefore, it has a sufficiently long life even if the internal cooling is not performed by circulating the cooling water. (Ii) Since the first seal member 31 is provided with the grease stopper lip 31c that is the first protruding portion, for example, even if the short side roll 25b is inclined, the lubricant supply passage 27a It is possible to reliably prevent the lubricant supplied between the support shaft 27 and the rotating body 28 from leaking to the outside, and thus the life of the first seal member 31 can be extended. (Iii) The first seal member 31 includes a main body portion 31a fixed to the holding member 30, a lip portion 31b, a grease stopper lip 31c, and a second protruding portion 31d that comes into contact with the second seal member 32. Since it is possible to reliably seal the space between the fixed shaft 27 and the rotating body 28, the dustproof property and the moistureproof property are excellent.

Therefore, according to the present embodiment, even if the short side roll 25b of the continuous casting machine 20 is not internally cooled, the hardening of the first rubber seal member 31 is suppressed and the foreign matter on the bearing 29 is prevented. It is possible to improve lubrication by reducing the mixture. Therefore, according to the present embodiment, it is possible to extend the life of the bearing 29 of the short side roll 25b. Specifically, the life extension of the bearing 29 of the short side roll 25b can be increased to more than double from the conventional charge of less than 1200 to 2400 or more. (Iv) Since the sealing property inside the short side roll 25b can be improved, the lubrication state of the bearing 29 is about 10 in terms of lubricant cleanliness.
It was remarkably improved by 0 times. (V) The sealing property inside the short side roll 25b can be improved,
As a result, it is possible to reliably prevent the intrusion of water and foreign matters into the bearing 29, so that abnormal wear of the bearing 29 is reduced to about (1/10).
It was possible to reduce to 0). (Vi) Even if the first seal member 31 is made of rubber, which is made of a good seal, it can be prevented from being hardened, so that the life can be extended to about twice. As a result, the life extension of the bearing 29 of the short-side roll 25b can be increased to more than double, from less than 1200 charges in the conventional case to 2400 charges or more.

As described above, the short side roll 25 of this embodiment
b has a sufficiently long life even without internal cooling by circulating cooling water, and has excellent dustproofness, moistureproofness, and lubricant leakage prevention, so that it can be used immediately below the mold of a continuous casting machine. It can be suitably used as a short side roll used in a hot and humid environment.

[0052]

EXAMPLES The sleeve type roll according to the present invention will be described more specifically with reference to examples.

FIG. 2 is a comparative example in which the short side roll 25b using the sleeve type roll of the present invention shown in FIG. 1 and the sleeve type roll shown in FIGS. 3 and 4 are used and the seal member 12 is made of rubber. FIG. 6 is an explanatory view showing the short side rolls 6b and 6 of FIG.

Table 2 shows the results of quantitative ferrography (evaluation of particle distribution by magnetic gradient) of abnormal wear of the bearings of the present invention and comparative examples.

[0055]

[Table 2]

In the short-side roll 6b using the sleeve type roll of the comparative example, the heat source of the slab 4 heated to a surface temperature of about 1000 ° C., via the rotor 9 and the bearing 10, the rubber seal member 12 is used. Since the rubber seal member 12 'is hardened and shrunk due to the transmission to the', a gap is formed between the rubber seal member 12 'and the rotating body 9 and the sealing performance is deteriorated. As shown in Table 2, mixing of water and foreign matters and The lubricant (grease) supplied between the support shaft 8 and the rotating body 9 leaked without staying, and the life of the bearing 10 was extremely short, about 700 to 1000 charges.

On the other hand, according to the short side roll 25b using the sleeve type roll of the present invention, even if heat reaches the bearing 29 from the rotating body 28, the holding member 30 and the first seal member 31 are separated from each other. Since heat is transferred through the lubricant filled in the gap 33 intentionally designed between the first seal member 3 and the first seal member 3
It has become possible to suppress the temperature rise of 1 to about 5 to 15 ° C./6 charge.

Further, in the short side roll 25b using the sleeve type roll of the present invention, the rotating body 2 is rotated by the cooling water sprayed from the cooling water spray nozzle 26b of the continuous casting machine 20.
Since the second seal member 32 (thickness: about 3 to 10 mm) screwed to the end face of 8 is water-cooled, the first seal member 31 is also indirectly cooled by cooling water through the second seal member 32. Therefore, it is cooled by about 10 to 25 ° C./6 charge.

As described above, according to the short side roll 25b using the sleeve type roll of the present invention, compared with the short side roll 6b using the sleeve type roll of the comparative example, the supporting shaft and the rotating body are separated from each other. The temperature of the seal member that seals the space between them could be reduced by up to about 45 ° C./6 charge. This allows
Even if the temperature of the seal member 12 ′ of the comparative example rises to about 220 ° C./charge, the temperature of the first seal member 31 is about 180 ° C., which is the allowable temperature of 200 ° C. or lower.
I was able to decrease.

(Modification) In the description of the embodiments and examples, the case where the sleeve type roll according to the present invention is applied to a short side roll used in a hot and humid environment directly below the mold of a continuous casting machine is described. I took it as an example. However, the present invention is not limited to the case of being applied to the short side roll, and is similarly applicable to various rolls used in a hot and humid environment. For example, the present invention is also applicable to rolled steel material conveying rollers and the like, which are arranged in parallel on the inlet side and the outlet side of a hot rolling mill.

In the description of the embodiments and examples, the case where the gap 33 is provided between the holding member 30 and the first seal member 31 is taken as an example. However, the present invention
The configuration is not limited to this, and is provided between the holding member 30 and the bearing 29, between the holding member 30 and the rotating body 28, and further, the bearing 2
A gap may be provided also in at least one of 9 and the rotating body 28, and the temperature rise of the first seal member 31 may be suppressed by utilizing the heat insulating effect of this gap.

Instead of these gaps, a heat insulating member made of concrete, ceramics or the like may be interposed in the gap forming portion to suppress the temperature rise of the first seal member 31.

Furthermore, in the description of the embodiments and examples, the case where the first seal member 31 has a rectangular cross-sectional shape is taken as an example. However, the present invention is not limited to this form, and the first seal member 31 may have a cross-sectional shape of, for example, a substantially circular diameter.

[0064]

As described in detail above, according to the present invention, a sufficiently long life can be obtained without internal cooling by circulating cooling water, and excellent dustproofness, moistureproofness and lubricant leakage prevention can be obtained. From having both, for example,
It was possible to provide a sleeve-type roll that can be suitably used as a short-side roll used in a hot and humid environment immediately below the mold of a continuous casting machine.

The significance of the present invention having such effects is extremely remarkable.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a state in which a sleeve type roll of the present embodiment is applied to a short side roll of a continuous casting machine performing continuous casting of a slab by partially enlarging and extracting it. .

2 is a short side roll using the sleeve type roll of the example of the present invention shown in FIG. 1, and a short side roll of a comparative example in which the sleeve type roll shown in FIGS. 3 and 4 is used and the seal member is made of rubber. FIG. 4 is an explanatory diagram showing the two parts by dividing them by the center line in the longitudinal direction thereof.

FIG. 3 is an explanatory view schematically showing a situation where continuous casting of a slab is performed by a continuous casting machine.

FIG. 4 is an explanatory diagram showing an example of the relationship between the structure of each of the long-side rolls and the short-side rolls, the bearing temperature, and the actual number of charges up to roll replacement.

FIG. 5 is an explanatory diagram showing an analysis ferrography result of the lubricant supplied to the short side roll in which abnormal wear of the bearing has occurred.

[Explanation of symbols]

25b sleeve type roll 27 Support shaft 28 rotating body 30 holding member 30a thick part 30b Thin part 31 First Seal Member 31a main body 31b Lip part 32 Second seal member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) F16J 15/18 F16J 15/18 C (72) Inventor Minoru Wada Sumitomo Metal Industry Co., Ltd., Kashima City, Ibaraki Prefecture Kashima Works Co., Ltd. (72) Inventor Masamitsu Minato Sumitomo Metal Industry, Kashima City, Ibaraki Prefecture 3 Sumitomo Metal Industries Co., Ltd. Kashima Works Co., Ltd. (72) Maezono Yasuhiro Kashima City, Ibaraki Prefecture Sumitomo Metal Industries Co., Ltd. Kashima Steel Works In-house (72) Yukio Narige 3 Hikari, Kashima, Kashima-shi, Ibaraki Sumitomo Metal Industries, Ltd. Kashima Steel Works (72) Inventor Soichiro Ueda 2-3-5 Mitsugaoka, Nishi-ku, Kobe-shi, Hyogo Inside Rokuryo Rubber Co., Ltd. (72) Hideki Nakamura Inventor Hideki Nakamura 2-3-5 Mitsugaoka, Nishi-ku, Kobe-shi, Hyogo Prefecture F-term in Rokuryo Rubber Co., Ltd. (reference) 3J043 AA16 BA08 CA02 3J103 AA02 AA45 AA75 BA13 BA47 CA25 DA05 FA22 FA25 FA26 GA15 4E004 LC01 LC03

Claims (9)

[Claims] 1. A support shaft, which is fixedly arranged, and a cylindrical rotating body, which is rotatably arranged around the support shaft, apart from the support shaft, and further has a gap between the support shaft and the support shaft. And a ring-shaped holding member that is mounted on the inner surface of the rotating body, and that is held by the holding member and abuts the outer surface of the support shaft, thereby sealing the space between the support shaft and the rotating body. And a ring-shaped first seal member that stops. 2. The first seal member includes a main body portion held by the holding member, and a lip portion which has flexibility and seals the space by contacting an outer surface of the support shaft. The sleeve-type roll according to claim 1, further comprising: 3. The holding member has a thick portion and a thin portion having an inner diameter larger than that of the thick portion, and the main body portion is held by the step portion of the thick portion and the thin portion. The sleeve type roll according to claim 2, wherein the inner diameter of the thin portion is larger than the outer diameter of the main body portion. 4. The sleeve type roll according to claim 1, wherein the holding member is made of a heat insulating material. 5. The sleeve type roll according to claim 1, wherein the support shaft has a lubricant supply path to the space. 6. A first projecting portion that prevents the lubricant supplied to the space from leaking to the outside of the space by contacting the outer surface of the support shaft with the first seal member. The sleeve type roll according to claim 5. 7. An annular second member arranged so as to abut on an end portion of the rotating body and the first seal member, respectively.
The sleeve-type roll according to any one of claims 1 to 6, further comprising: 8. The sleeve-type roll according to claim 7, wherein the first seal member further has a second protruding portion that abuts on the second seal member. 9. The method according to claim 7, wherein at least the second seal member is used while being injected with a cooling liquid.
The sleeve type roll described in.