JP2008279493A - Roll device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll device capable of performing reliable cooling on the entire surface of a roll by reducing air stagnation in the internal space of a roll body as far as possible. <P>SOLUTION: The roll device 1 comprises a roll body 3 the inner part of which has a hollow structure, a bearing part 9 to freely rotatably support the roll body 3, a liquid feed means 13 for feeding cooling liquid W in the roll body 3, and a liquid discharging means 14 for discharging the fed cooling liquid W in the roll body 3. The liquid discharging means 14 has at least one discharging passage 21 communicating with the outside from the inside 10 of the roll body 3. A discharge port 20 opened in the inner part 10 of the roll body 3 and arranged on the outermost side outwardly in the radial direction in the inside 10 of the roll body 3 is formed at the inlet of the discharging passage 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roll apparatus suitable for a transport roll for transporting a slab or a rolled material in a hot state.

Conventionally, a roll body that is in contact with a hot slab such as a support roll and a transport roll in a continuous casting machine, and a roll device provided with this roll body are thermally deformed by heat transfer from the slab, a seal part, a bearing, and the like. A cooling mechanism is provided to prevent burning.
For example, as shown in FIG. 3 (FIG. 10 of the present specification) of Patent Document 1, if the roll body 101 has a hollow structure, the cooling provided in the center of the pair of roll gripping portions 102 and 103 is used. The roll body 101 is cooled by circulating the cooling water W inside the roll body 101 through the water passage 104.

Patent Document 2 discloses a technique for cooling the roll device more effectively. The roll apparatus includes a hollow roll body having a flange-shaped partition wall therein, an inlet shaft body attached to one body end of the roll body and having a cooling water supply path, and an inlet shaft. A rotary joint that is disposed on the inlet side of the body and supplies cooling water; and an outlet shaft body that is attached to the other end of the roll body and has a drainage channel.
In this roll main body, the supplied cooling water is fed into the supply path in the inlet shaft body through the rotary joint, and into the roll main body through a through hole provided in the flange on the inlet shaft body side. Water is supplied to cool the roll cylinder, and further flows into the drainage passage of the outlet shaft through the through hole of the flange of the outlet shaft.
JP-A-9-272960 (FIG. 3) JP 2000-246321 A (FIG. 1)

  However, in the roll main body 101 disclosed in Patent Document 1, there is a portion positioned higher than the cooling water passage 104 at the center of the roll main body in the internal space of the roll main body 101 due to the structure. An air reservoir is formed in the upper part of the internal space. In the case of an open cooling system in which no pressure (back pressure) is generated on the drainage side, the air reservoir has a water surface height substantially equal to that of the internal discharge port 105 of the cooling water passage 104 and the internal space. Air accumulation occurs at a higher location. Even in the case of a closed cooling system that can build back pressure on the drainage side, although the residual air in the internal space of the roll body 101 contracts due to the back pressure, it is difficult to eliminate the air pool.

  The air pool is generated at the upper side of the internal space of the roll main body 101, that is, in the vicinity of the contact line between the cast slab and the roll main body 101 which is at a high temperature. For example, when the rotation of the roll body 101 is stopped and the slab is stagnant, the contact line between the roll body 101 and the slab is fixed, a thermal gradient is generated in the roll radial direction, and the slab contact line side Thermal expansion increases, and the roll main body 101 is bent. This bending of the roll causes a large load fluctuation when the slab conveyance is resumed, and causes a conveyance trouble. Since the roll surface becomes high temperature, the possibility of accelerating high-temperature oxidation of the surface of the roll main body 101 and reducing the roll life cannot be denied.

The same phenomenon occurs even in the roll apparatus disclosed in Patent Document 2. That is, the water surface height in the through hole of the flange and the internal space substantially coincide with each other, and an air pool is generated in a place higher than the through hole, that is, in the vicinity of the contact portion between the slab and the roll that is at a high temperature. Patent Document 2 discloses that “an orifice is provided to eliminate an air reservoir”, but it is difficult to completely eliminate the air reservoir even if the back pressure can be increased and the volume of the air reservoir can be reduced.
Although not described in detail, there is a siphon-type roll cooling system in which a siphon elbow and a siphon pipe are inserted into the roll device and cooling water is supplied from there, but the siphon elbow and siphon pipe are connected to the inner space of the roll. Since it has a structure in which it is inclined downward by its own weight after insertion, it cannot be fixed upward. For this reason, the air reservoir in the upper part inside the roll cannot be eliminated, and the same problem as described above is caused. Furthermore, the heat crack generated by repeated heating and rapid cooling of the roll surface layer accompanying the rotation of the roll expands, and the heat crack extends to the inner space of the roll, leading to an accident that the cooling water inside the roll is ejected. Absent.

  Therefore, the present invention has been made in view of the above circumstances, and in a roll apparatus configured to perform cooling by supplying a cooling liquid to the internal space of the roll body, air in the internal space of the roll body is provided. The purpose is to reduce the accumulation as much as possible and to reliably cool the entire space inside the roll.

In order to achieve the above object, the present invention has taken the following measures.
That is, the roll device according to the present invention includes a roll body having a hollow structure inside, a bearing portion that rotatably supports the roll body, and a liquid supply unit that supplies a coolant to the inside of the roll body. And a drain means for discharging the supplied coolant inside the roll body, the drain means having one discharge passage communicating from the inside of the roll body to the outside, The inlet of the discharge passage is provided with a discharge port that opens to the inside of the roll main body and is disposed on the outermost side in the radially outward direction inside the roll main body.

The roll device according to the present invention includes a roll body having a hollow structure inside, a bearing portion that rotatably supports the roll body, and a liquid supply unit that supplies a cooling liquid to the inside of the roll body. And a drain means for discharging the supplied coolant inside the roll body, the drain means having a plurality of discharge passages communicating from the inside of the roll body to the outside, The inlet of the discharge passage is provided with a discharge port that opens to the inside of the roll main body and is arranged on the outermost side in the radially outward direction inside the roll main body.
Thereby, the coolant supplied to the inside of the roll main body by the liquid supply means reaches the same position as the discharge port provided on the outermost diameter inside the roll main body, and the coolant substantially fills the internal space of the roll main body. It becomes like this. Therefore, there is almost no air accumulation in the internal space, and reliable cooling can be performed on the entire roll surface.

The roll body includes a roll cylinder having an open portion that is hollow inside and open to the outside on both sides, a disk-shaped side wall that closes the open portion of the roll cylinder portion, It is good to have a roll holding body protruding from the side wall body in the direction of the rotation axis of the roll body and supported by the bearing portion.
In this case, the discharge port of the drainage means is disposed at a position adjacent to or in contact with the inner peripheral wall of the roll cylinder at the peripheral edge of the side wall body, A discharge passage communicating with the outside from the discharge port through the roll gripping body may be provided.

Preferably, the drainage means has a discharge pipe protruding inside the roll body, and a base end portion of the discharge pipe is connected to a discharge passage communicating with the outside through the roll gripping body, The tip of the discharge pipe may be provided with the discharge port provided at a position close to, in contact with, or into the inner peripheral wall of the roll cylinder.
The drainage means includes a partition body provided inside the roll body and in the vicinity of the side wall body, a partition chamber formed between the partition body and the side wall body, and a peripheral portion of the partition body. A discharge port that is disposed at a position close to, in contact with, or into the inner peripheral wall of the roll cylinder and communicates with the partition wall chamber, and a discharge that communicates with the partition wall chamber through the roll gripping body to the outside. And a passage.

Note that when there are a plurality of the discharge ports, the sum of the cross-sectional areas of the plurality of discharge ports is set to be smaller than or the same as the cross-sectional area of the coolant supply port provided in the liquid supply means Is very preferable.
When there are a plurality of the outlets, the sum of the channel resistances of the plurality of outlets is set to be greater than or equal to the channel resistance of the coolant supply port provided in the liquid supply means. Good.

  According to the roll device of the present invention, the inner space of the roll main body can be filled with the cooling liquid in a state where the air accumulation is as small as possible, and the entire roll main body can be reliably cooled.

Hereinafter, the best mode of a roll apparatus according to the present invention will be described with reference to the drawings.
The roll apparatus 1 can be employed in, for example, a slab conveying device of a continuous casting machine, and conveys a slab 2 having a high temperature to the downstream side while being supported by the roll apparatus 1. However, the application range of the roll apparatus 1 according to the present invention is not limited to this.
[First Embodiment]
FIG. 1 is an overall cross-sectional view of the roll apparatus 1.
As shown in this figure, the roll apparatus 1 has a roll body 3 that is rotatable so as to support the slab 2. The roll body 3 has a hollow structure inside.

The roll body 3 has a roll cylinder 4 that is cylindrical and has open portions that are open to the outside on both sides. The slab 2 is supported by the outer peripheral surface of the roll cylinder 4. Open portions on both sides of the roll cylinder 4 are closed by disk-shaped side walls 5, and roll grip bodies 6, 7 extend from the center of each side wall 5 along the rotational axis direction of the roll body 3. It is extended. The side wall body 5 is fitted in step portions 41 formed on both sides of the roll cylinder body 4 so as to have a larger diameter than the inner peripheral wall 40 of the roll cylinder body 4.
The roll grippers 6 and 7 are supported by a pair of left and right bearing boxes 8 provided on the base 11. Specifically, it is rotatably held around the rotation axis by a bearing portion 9 such as a bearing provided in the bearing box 8.

The roll apparatus 1 is provided with a cooling means 12 that supplies cooling water W to an internal space 10 of the roll body 3 (hereinafter also simply referred to as a roll interior 10) and cools the roll body 3 from the inside. Yes. The cooling means 12 includes a water supply means 13 (liquid supply means) for supplying the cooling water W to the roll interior 10 and a drainage means 14 (drainage means) for discharging the cooling water W supplied to the roll interior 10. Yes. In this embodiment, the cooling water W is adopted as the cooling liquid supplied to the roll interior 10, but there is no problem even if other cooling medium such as cooling oil is used.
The water supply means 13 has a water supply pipe 15 that supplies the cooling water W to the inside of the roll 10. The water supply pipe 15 has a length slightly shorter than the roll cylinder 4.

On the other hand, the roll gripping body 6 on the one side of the roll body 3 (the roll gripping body on the right side in FIG. 1 and may be referred to as the first roll gripping body 6 hereinafter) is coaxial with its rotational axis. A first through hole 16 is formed so as to penetrate the inside of the roll 10 from the outside. The other side roll gripper 7 (the left side roll gripper in FIG. 1 and may be referred to as the second roll gripper 7 hereinafter) is coaxially connected to the rotation axis from the inside of the roll 10 to the outside. A second through hole 17 that does not penetrate to the outside is formed.
The water supply pipe 15 described above coincides with the rotational axis of the roll body 3 and is inserted into the first through-hole 16 and the second through-hole 17 in a loosely fitted state, and its tip is close to the end of the second through-hole 17. It is in a state to do. The base end portion of the water supply pipe 15 is fixed to the first roll gripping body 6 so that this state can be maintained.

A rotary joint 18 is attached to a base end portion of the water supply pipe 15 that protrudes outward from the first roll gripping body 6. The rotary joint 18 of the present embodiment is a dual type and can flow two systems, the base end of the water supply pipe 15 is connected to the first opening 19 of the rotary joint 18, and the flow of the first system. Is supplied into the water supply pipe 15.
On the other hand, the drainage means 14 has at least one discharge passage 21 that communicates from the inside of the roll body 3 to the outside, and opens at the inside 10 of the roll body 3 at the inlet of the discharge passage 21 and A discharge port 20 arranged on the outermost side in the radially outward direction in the inside 10 is provided.

In the case of the present embodiment, the discharge port 20 is arranged at a position that is a peripheral edge portion of the side wall body 5 and is in contact with the inner peripheral wall 40 of the roll cylinder 4. Further, as the drainage means 14, the side wall body 5 is provided with a discharge through hole 22 that extends from the discharge port 20 and communicates with the first through hole 16 of the first roll gripping body 6.
Specifically, the discharge port 20 is formed on the side of the side wall body 5 facing the roll interior 10, and the inner peripheral wall 40 surface and the peripheral surface of the discharge port 20 are flush with each other. The cross-sectional shape of the discharge port 20 is circular.

  A discharge through hole 22 is formed in the direction of the axial direction of the side wall body 5 from the discharge port 20. Further, the discharge passage hole 22 is formed so as to change the direction by 90 degrees in the middle portion in the axial direction of the side wall body 5 and to change the direction along the radial direction of the side wall body 5 to the central portion of the side wall body 5 It communicates with a space formed between the through hole 16 and the outer peripheral surface of the water supply pipe 15. The space, that is, the point where the discharge passage 22 communicates is the second opening 23 (second system) of the rotary joint 18. The discharge passage 21 and the first through-hole 16 constitute a discharge passage 21 that guides the cooling water W inside the roll 10 to the outside.

The rotary joint 18 has a type that allows the connected water supply pipe 15 to rotate together with the roll body 3 and a type that restricts the rotation of the water supply pipe 15. It does not interfere with the flow of the first system and the second system of water W.
A water stop member 24 is fitted to a portion of the first through hole 16 that is open to the inside of the roll 10 so as to surround the water supply pipe 15. As a result, the first through hole 16 and the inside of the roll 10 are not communicated with each other, and the cooling water W is always discharged to the outside through the discharge port 20.

In the case of this embodiment, the water supply means 13 and the drainage means 14 are not directly connected, and the drainage means 14 is open discharge (discharged to the outside through the second opening 23 of the rotary joint 18). However, the water supply means 13 and the drainage means 14 may be connected via a pump or the like to be a closed type (circulation type).
Next, the cooling method of the roll apparatus 1, that is, the flow of the cooling water W in the roll body 3 will be described with reference to FIG. In addition, it is in the initial state which begins to supply the cooling water W in the roll main body 3 immediately after roll rotation that this invention has a remarkable effect.

First, roll rotation starts, and the cooling water W is supplied to the first opening 19 of the rotary joint 18. As the roll body 3 rotates, the discharge port 20 rotates 360 degrees, but once per roll rotation, the position of the drain hole shown in FIGS. Is the highest).
In the state of FIG. 2A, the supplied cooling water W flows through the rotary joint 18 from the proximal end portion to the distal end portion of the water supply pipe 15 and rolls through the second through hole 17. Accumulate in the interior 10. At that time, the air (air) that has been in the roll interior 10 from the beginning is discharged to the outside through the discharge passage 21 via the discharge port 20 positioned at the uppermost position inside the roll body 3.

Thereafter, as shown in FIG. 2 (b), with the rotation of the roll, the cooling water W is sequentially supplied to the inside of the roll 10 by the water supply means 13, and the air is discharged from the discharge port 20 located at the top of the inside of the roll 10. It will be discharged to the outside. Therefore, the amount of cooling water inside the roll 10 increases.
As shown in FIG. 2C, the water surface of the cooling water W inside the roll 10 reaches the discharge port 20 and the entire inside of the roll 10 is filled with the cooling water W by several rotations after the roll rotation starts. It becomes like this.
Note that when the discharge port 20 is not positioned above the roll interior 10, in other words, when the discharge port 20 is submerged in the cooling water W, the air is not discharged. However, since the roll main body 3 is always rotating, the discharge port 20 is positioned at a higher position once per rotation of the roll, so that reliable air discharge and filling of the cooling water W into the roll interior 10 are performed.

As described above, while the roll main body 3 is rotated several times, there is almost no air accumulation in the roll interior 10 and the roll interior 10 is filled with the cooling water W, and the entire roll body 3, particularly the contact line between the slab 2 and the roll. Reliable cooling in the vicinity can be performed.
[Second Embodiment]
FIG. 3 is an overall cross-sectional view of a second embodiment of the roll device according to the present invention.
As shown in this figure, the roll apparatus 1 includes a roll body 3 that is rotatable and has a hollow structure inside, a disk-shaped side wall body 5, and a pair of roll grip bodies 6. , 7, the point that the roll gripping bodies 6, 7 are supported by the bearing housing 8, and the point that the water supply means 13 and the drainage means 14 are provided. It is supposed to be attached.

Hereinafter, differences from the first embodiment will be described.
The water supply means 13 of the present embodiment includes a first through hole 16 provided in the first roll gripping body 6. The first through hole 16 is coaxial with the rotational axis of the first roll gripping body 6 and is formed to communicate with the roll interior 10 from the outside. The base end of the first through hole 16 communicates with the outside through a one-system rotary joint 18. By supplying the cooling water W to the opening 30 of the rotary joint 18, the cooling water W can be supplied to the roll interior 10.
On the other hand, the drainage means 14 is provided such that the peripheral edge thereof is in contact with the second through hole 17 formed in the second roll gripping body 7 and the peripheral edge portion of the side wall body 5 and the inner peripheral wall 40 of the roll cylinder 4. And a discharge passage hole 22 that communicates with the discharge port 20 and that is embedded in the side wall body 5 and communicates with the second through hole 17 in the second roll gripping body 7.

Specifically, the second through hole 17 is bored from the outside coaxially with the rotational axis of the second roll gripping body 7. The second through-hole 17 is formed only up to the middle part of the second roll gripping body 7, and the tip of the second through-hole 17 does not communicate with the inside of the roll 10. A base end portion of the second through hole 17 communicates with the outside through a one-system rotary joint 18.
At least one or more discharge ports 20 are formed in the side wall body 5 on which the second roll gripping body 7 is provided. The discharge port 20 is a surface facing the inside of the roll body 3 and is formed on the outermost diameter side, and is open to the inside of the roll 10. The discharge port 20 is circular, and its peripheral surface is flush with the surface of the inner peripheral wall 40 of the roll body 3.

A discharge through hole 22 is drilled from the discharge port 20 along the axial direction (thickness direction) of the side wall body 5. The discharge through hole 22 is formed so as to change the direction by 90 degrees in the middle portion in the axial center direction of the side wall body 5 and to change the direction along the radial direction of the side wall body 5 to the central portion of the side wall body 5. It communicates with the second through hole 17 described above through the gripping body 6. The discharge passage 21 and the second through-hole 17 constitute a discharge passage 21 through which the cooling water W inside the roll 10 is led out.
Also in this embodiment, the water supply means 13 and the drainage means 14 are not directly connected, and the drainage means 14 is open discharge. However, it may be a closed type.

Next, the cooling method of the roll apparatus, that is, the flow of the cooling water W in the roll body 3 will be described with reference to FIG.
First, the roll body 3 starts to rotate, and the cooling water W is supplied to the opening 30 of the rotary joint 18 of the first roll gripping body 6 (water supply side). The supplied cooling water W accumulates in the inside of the roll 10 through the first through hole 16, and the air above the cooling water W is discharged to the outlet 20 → the discharge through hole 22 → the second through hole 17 → to the outside. Is derived.
As the roll body 3 rotates, the discharge port 20 rotates 360 degrees, but once per roll, the position of the discharge port 20 is the highest as in FIGS. 2 (a) to 2 (c). Thus, as in the first embodiment, the air is discharged to the outside and the roll water 10 is filled with the cooling water W. Eventually, there is almost no air accumulation in the inside of the roll 10 and it is filled with the cooling water W, so that reliable cooling can be performed on the entire surface of the roll body 3, particularly in the vicinity of the contact line between the slab 2 and the roll body 3. It becomes like this.

Thus, also in the roll apparatus 1 of 2nd Embodiment, while the roll main body 3 rotates several times, the air pool in the roll inside 10 almost disappears, and the roll inside 10 is filled with the cooling water W, and the roll main body 3 whole In particular, reliable cooling in the vicinity of the contact line between the slab 2 and the roll can be performed.
[Third Embodiment]
FIG. 4 is an overall cross-sectional view of a third embodiment of the roll device according to the present invention.
Although the configuration of the drainage means 14 is different from that of the second embodiment, the rest is substantially the same.

The drainage means 14 of the present embodiment has a discharge pipe 31 protruding inside the roll body 3, and a base end portion thereof is a second through hole communicating with the outside through the second roll gripping body 7. 17, a discharge port 20 is provided at the distal end portion of the discharge pipe 31, and the discharge port 20 is disposed at a position close to or in contact with the inner peripheral wall 40 of the roll cylinder 4.
Specifically, a second through hole 17 is formed in the second roll gripping body 7, and the second through hole 17 is drilled from the outside on the rotational axis of the second roll gripping body 7. The distal end of the second through hole 17 communicates with the inside of the roll 10 via the discharge pipe 31, and the proximal end communicates with the outside via the one-system rotary joint 18.

The discharge pipe 31 is formed of a pipe or the like having a circular cross section, and a midway portion thereof is bent at approximately 90 °. A discharge port 20 is formed on one side (tip portion) of the discharge pipe 31, and the discharge port 20 is disposed at a position facing upward and substantially in contact with and facing the inner peripheral wall 40 of the roll cylinder 4. The base end portion of the discharge pipe 31 is fixed to the second roll gripping body 7 itself so as to communicate with the second through hole 17. That is, the discharge pipe 21 and the second through-hole 17 constitute a discharge passage 21 that guides the cooling water W inside the roll 10 to the outside.
The cooling method of the roll apparatus 1 in the present embodiment, that is, the flow of the cooling water W in the roll body 3 is substantially the same as in the second embodiment, and the supplied cooling water W passes through the first roll gripping body 6 through the first penetration. The air accumulated in the inside of the roll 10 through the hole 16 and is in the upper part of the cooling water W is led out to the outlet 20 → the outlet pipe 31 → the second through hole 17 → the outside. In addition, since the operational effects are substantially the same as those of the second embodiment, description thereof is omitted.
[Fourth Embodiment]
FIG. 5 is an overall cross-sectional view of a fourth embodiment of the roll device according to the present invention.

Although the configuration of the drainage means 14 is different from that of the second embodiment, the rest is substantially the same.
The drainage means 14 of the present embodiment includes a partition wall 32 provided inside the roll body 3 and in the vicinity of the sidewall body 5, a partition chamber 33 formed between the partition body 32 and the sidewall body 5, A discharge port 20 provided at a peripheral edge of the partition wall 32 and in contact with the inner peripheral wall 40 of the roll cylinder 4 and communicating with the partition wall 33, and from the partition chamber 33 through the second roll gripper 7 to the outside And a discharge through hole 22 communicating with the.

Specifically, the base end portion of the second roll gripping body 7 is extended to extend to the inside of the roll 10 to form an extending portion 34, and the roll cylinder 4 is provided at the edge of the extending portion 34. A disc-shaped partition body 32 fitted into the inner peripheral wall 40 is attached so that the center thereof coincides with the rotational axis of the roll body 3.
The partition body 32 divides the roll interior 10 into a central chamber and a side chamber (a chamber on the second roll gripper 7 side), and the side chamber is a partition chamber 33. The second through hole 17 formed in the second roll gripping body 7 is not in communication with the inside of the roll 10, but the extended portion 34 has at least one discharge through hole 22 facing radially outward. Perforated. The discharge through hole 22 allows the second through hole 17 and the partition wall 33 to communicate with each other.

On the other hand, a discharge port 20 penetrating the partition wall 32 in the thickness direction is formed at a position closest to the radially outer side of the partition body 32 and in contact with the inner peripheral wall 40 of the roll cylinder 4. There may be at least one or more outlets 20, and there is no problem even if a plurality of outlets 20 are formed.
The partition chamber 33, the discharge through hole 22, and the second through hole 17 constitute a discharge passage 21 that leads the cooling water W inside the roll 10 to the outside.
Next, the cooling method of the roll apparatus 1, that is, the flow of the cooling water W in the roll body 3 will be described with reference to FIG.

First, while starting roll rotation, the cooling water W is supplied to the opening part 30 of the rotary joint 18 of the 1st roll holding body 6 (water supply side). The supplied cooling water W is accumulated in the inside of the roll 10 through the first through-hole 16, and the air above the cooling water W is discharged from the discharge port 20 formed in the partition wall 32 → the partition chamber 33 → the discharge passage. The hole 22 → the second through hole 17 → the rotary joint 18 of the second roll gripping body 7 → derived to the outside.
As the roll body 3 rotates, the discharge port 20 rotates 360 degrees, but once per roll rotation, the discharge port 20 is at the highest position, and the roll is the same as in the first or second embodiment. With rotation, air is discharged and the inside of the roll 10 is filled with the cooling water W. Eventually, there is almost no air accumulation in the inside of the roll 10 and it is filled with the cooling water W, so that reliable cooling can be performed on the entire surface of the roll body 3, particularly in the vicinity of the contact line between the slab 2 and the roll. .
[Variation of outlet]
6 to 8 show modified examples of the discharge port 20 of the drainage means 14.

The discharge port 20 shown in FIG. 6 is formed on the side of the side wall 5 facing the roll interior 10, and the size thereof is substantially the same as that of the first embodiment. However, the position where the discharge port 20 is formed is more outward in the radial direction of the side wall body 5 than in the first embodiment, and the position (inner peripheral wall) entering from the inner peripheral wall 40 of the roll cylinder 4. The position in the radially outward direction from 40). Therefore, in order to smoothly discharge the cooling water W from the discharge port 20, a concave notch 36 is formed in a portion corresponding to the discharge port 20 on the inner peripheral wall 40 of the roll cylinder 4.
The discharge port 20 shown in FIG. 7 is formed at the most peripheral portion of the side wall body 5. In other words, the discharge port 20 is formed by cutting the peripheral edge portion of the side wall body 5 in the radially inward direction. Also in the case of this modification, since the position where the discharge port 20 is formed is in a position radially outward from the inner peripheral wall 40 of the roll cylinder 4, the cooling water W should be smoothly discharged from the discharge port 20. A concave notch 36 is formed in a portion corresponding to the discharge port 20 on the inner peripheral wall 40 of the roll cylinder 4.

6 and 7, the entire discharge port 20 enters the concave cutout portion 36, but there is no problem even if a part of the discharge port 20 is positioned into the cutout portion 36.
The drainage means 14 shown in FIG. 8 is a modification of the third embodiment. As shown in this figure, a concave counterbore portion 37 is formed in a portion corresponding to the discharge port 20 on the inner peripheral wall 40 located at the uppermost portion of the roll cylinder 4, and in the counterbore portion 37. The discharge pipe 31 is arranged in a state where the distal end portion (discharge port 20) of the discharge pipe 31 enters.

6 to 8, the discharge port 20 is provided at a position where the discharge port 20 enters the inner peripheral wall 40 located at the top of the roll cylinder 4, and the discharge port 20 at this position is disposed. The air inside the roll 10 is discharged through. Therefore, the roll apparatus 1 provided with the drainage means 14 in any one of FIGS. 6 to 8 is filled with the cooling water W without any air accumulation in the roll interior 10 while the roll body 3 rotates several times, and the entire roll surface. In particular, reliable cooling in the vicinity of the contact line between the slab 2 and the roll can be performed.
[Cross-sectional area of outlet]
By the way, regarding the discharge port 20 described in the first to fourth embodiments and the modified examples, when the discharge port 20 has one hole, the size (cross-sectional area) is not limited, but two or more holes. In the case of a plurality of holes, there is a restriction condition on the size of the hole. In the first to fourth embodiments and the modification, the condition is satisfied.

FIG. 9 is a diagram for explaining conditions that the discharge port 20 should satisfy.
For example, in the case of “Case 1” in FIG. 9 when “the discharge port 20 has two holes and the positions are 180 ° phase (opposite sides with respect to the rotation axis position of the roll body 3)”. If the size of the discharge port 20C below the surface of the cooling water W is too larger than the size of the cooling water supply port (cooling liquid supply port), the amount of discharge will be larger than the supply amount of the cooling water W. The water level inside the roll 10 cannot be raised and the air cannot be discharged. Therefore, as a condition for discharging the air, the sectional area C _{A of the} outlet 20 ≦ the sectional area A _{A of the} cooling water supply port It is necessary to satisfy.

In addition, the cooling water supply port said here is opening of the front-end | tip of the water supply pipe 15 in 1st Embodiment, and respond | corresponds to the 1st through-hole 16 in 2nd Embodiment-4th Embodiment.
Similarly, in the case of [Case 2] in FIG. 9, the air capacity cannot be reduced if the outlet 20B below the surface of the cooling water W is too larger than the size of the cooling water supply port. Therefore, as a condition for discharging air, it is necessary to satisfy the cross-sectional area B _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port.
In the case of [Case 3] in FIG. 9, the discharge ports 20B and 20C are submerged. In that case, if the sum of the cross-sectional areas of the discharge port 20B and the discharge port 20C is too larger than the cross-sectional area A of the cooling water supply port, the water level in the roll interior 10 cannot be raised. Therefore, the condition for raising the water level in the roll interior 10 is the sectional area C _{A of the} outlet 20 + the sectional area B _{A of the} outlet 20 ≦ the sectional area A _A of the cooling water supply port.

In turn, this is a case where “the discharge port 20 has two holes and the positions of each other are 90 ° phase (a positional relationship perpendicular to the rotational axis position of the roll body 3)” as shown in [Case 4] in FIG. In this case, if the size of the discharge port 20C below the surface of the cooling water W is too large than the size of the cooling water supply port, the amount of discharge will be larger than the supply amount of the cooling water W, The water level cannot be raised. As a condition for increasing the water level, it is necessary to satisfy the cross-sectional area C _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port.
In the case of [Case 5] in FIG. 9, the air capacity cannot be reduced if the outlet 20B below the surface of the cooling water W is too larger than the size of the cooling water supply port. Therefore, as a condition for discharging air, it is necessary to satisfy the cross-sectional area B _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port.

In the case of [Case 6] in FIG. 9, it is necessary to satisfy the cross-sectional area C _{A of the} discharge port 20 + the cross-sectional area B _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port based on the same idea as [Case 3]. is there.
In summary, when there are two discharge ports 20, (the cross-sectional area C _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port) and (the cross-sectional area B _A of the discharge port 20 ≦ the cooling water supply port If the cross-sectional area A _A ) and (the cross-sectional area C _{A of the} discharge port 20 + the cross-sectional area B _A of the discharge port 20 ≦ the cross-sectional area A _A of the cooling water supply port), the air is discharged as the roll body 3 rotates. it can. (Cross sectional area C _A of discharge port 20 ≦ Cross sectional area A _A of cooling water supply port) and (Cross sectional area B _A of discharge port 20 ≦ Cross sectional area of cooling water supply port A _A ) C _A + Cross sectional area B _A ≦ Cross sectional area A _A of cooling water supply port) (C _A + Cross sectional area C _A + Cross sectional area B _A ≦ Cooling water supply) Only the condition of the mouth cross-sectional area A _A ) needs to be satisfied. In other words, when there are a plurality of discharge ports 20, the sum of the cross-sectional areas of the plurality of discharge ports 20 is smaller than or equal to the cross-sectional area of the cooling water supply port provided in the water supply means 13. It is good to set.

  The above relationship is established when the cooling water W is a complete fluid (non-viscous fluid), but actually, the flow path inside the roll 10 compared to the discharge port 20 and the cooling water supply port. Since the area is large, the flow velocity in the roll interior 10 is very small, and the pressure loss due to the roll interior 10 is negligible. There is no practical problem even if the cooling water W is considered as a complete fluid. "When there are a plurality of outlets 20, the sum of the channel resistances of the plurality of outlets 20 is set to be greater than or equal to the channel resistance of the cooling water supply port provided in the water supply means 13". Then, it is not necessary to consider the viscosity of the cooling water W.

The same applies when there are three or more outlets 20.
By the way, the present invention is not limited to the above embodiments, and can be appropriately changed according to the embodiments.
For example, the peripheral edge of the discharge port 20 does not necessarily need to contact the inner peripheral wall 40 of the roll cylinder 4, and the vicinity thereof, for example, the distance from the inner peripheral wall 40 to the peripheral edge of the discharge port 20 is about 2 mm to 15 mm. It may be in a position, or may be in a position on the inner side of the diameter about 98% to 90% of the distance from “the inner peripheral wall 40 to the rotation center of the roll body 3”. Even in that case, the air inside the roll 10 is almost exhausted.

It is a whole sectional view of a roll device of a 1st embodiment. It is the figure which showed the process in which cooling water fills a roll main body. It is whole sectional drawing of the roll apparatus of 2nd Embodiment. It is whole sectional drawing of the roll apparatus of 3rd Embodiment. It is whole sectional drawing of the roll apparatus of 4th Embodiment. It is the figure which showed the modification of the discharge port. It is the figure which showed the modification of the discharge port. It is the figure which showed the modification of the discharge port. It is the figure which showed the relationship between the cross-sectional area of a discharge port, and the drainage condition. It is the figure which showed the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll apparatus 2 Cast piece 3 Roll main body 4 Roll cylinder 5 Side wall body 6 1st roll holding body 7 2nd roll holding body 8 Bearing box 9 Bearing part 10 Roll inside 11 Base 12 Cooling means 13 Water supply means 14 Drain means 15 Water supply pipe 16 First through hole 17 Second through hole 18 Rotary joint 19 First opening 20 Discharge port 21 Discharge passage 22 Discharge through hole 23 Second opening 24 Water stop member 30 Opening portion 31 Discharge pipe 32 Partition body 33 Partition wall Chamber 34 Extension part 36 Notch part 37 Counterbore part 40 Inner peripheral wall 41 Step part W Cooling water

Claims (8)

A roll body having a hollow structure inside, a bearing portion that rotatably supports the roll body, a liquid supply means for supplying a cooling liquid to the inside of the roll body, and a supply inside the roll body In a roll apparatus having a drain means for discharging the cooling liquid,
The drainage means has one discharge passage communicating from the inside of the roll main body to the outside, and the inlet of the discharge passage opens to the inside of the roll main body and radially outwards inside the roll main body. A roll apparatus characterized by being provided with a discharge port arranged on the outermost side. A roll body having a hollow structure inside, a bearing portion that rotatably supports the roll body, a liquid supply means for supplying a cooling liquid to the inside of the roll body, and a supply inside the roll body In a roll apparatus having a drain means for discharging the cooling liquid,
The drainage means has a plurality of discharge passages communicating from the inside of the roll body to the outside, and the inlet of each discharge passage opens to the inside of the roll body and is the most radially outward in the roll body. A roll apparatus comprising a discharge port arranged on the outside.   The roll body includes a roll cylinder having an open portion that is hollow inside and open to the outside on both sides, a disk-shaped side wall that closes the open portion of the roll cylinder, and the side wall The roll apparatus according to claim 1, further comprising: a roll gripping body that protrudes in the direction of the rotation axis of the roll main body and is supported by the bearing portion. The discharge port of the drainage means is disposed at a position adjacent to the inner peripheral wall of the roll cylindrical body, or a position in contact with the peripheral edge of the side wall body, or a position where it enters.
The roll apparatus according to claim 3, wherein the side wall body is provided with a discharge passage communicating from the discharge port through the roll gripping body to the outside. The drainage means has a discharge pipe protruding inside the roll body,
The base end of the discharge pipe is connected to a discharge passage communicating with the outside through the roll gripping body,
The tip of the discharge pipe is provided with the discharge port disposed at a position close to, in contact with, or into an inner peripheral wall of the roll cylinder. Roll device.   The drainage means includes a partition body provided inside the roll body and in the vicinity of the side wall body, a partition chamber formed between the partition body and the side wall body, and a peripheral portion of the partition body. A discharge port that is disposed at a position close to, in contact with, or into the inner peripheral wall of the roll cylinder, and that communicates with the partition chamber, and communicates with the outside through the roll gripper from the partition chamber. The roll apparatus according to claim 3, further comprising a passage.   When there are a plurality of the discharge ports, the sum of the cross-sectional areas of the plurality of discharge ports is set to be smaller than or equal to the cross-sectional area of the coolant supply port provided in the liquid supply means. The roll device according to any one of claims 1 to 6.   When there are a plurality of the outlets, the sum of the channel resistances of the plurality of outlets is set to be greater than or equal to the channel resistance of the cooling liquid supply port provided in the liquid supply means. The roll device according to any one of claims 1 to 6.

Images