JP2001340947A - Apparatus for hermetically sealing roller bearing for continuously casting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for hermetically sealing a roller bearing which supports the middle portion of the roll for the continuously casting equipment which can prevent a sealing lifetime from deteriorating in hot environment and can also prevent both leakage of lubricant from the inside of the roller bearing and intrusion of foreign objects into the roller bearing. SOLUTION: A second seal which prevents the intrusion of the foreign objects into the roller bearing and a first seal which prevents the leakage of lubricant from the inside of the roller bearing are provided in this order from the end portion with a clearance between the two seals in both end portion in the axial direction of the roller bearing and at the same time, an air supply passage to blows air into the clearance between seals is provided, and the second seal is provided in a separate position apart from the end surface of the roller bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll bearing sealing device for rotatably supporting an intermediate portion of a roll for a continuous casting machine.

[0002]

2. Description of the Related Art Various types of rolls for continuous casting machines are provided in continuous casting machines for continuously casting slabs. The pinch roll 10 provided in the continuous casting machine is rotatably supported by roll bearings 30, 40, 50 with a slab C interposed therebetween as shown in FIG. Is connected to a drive source (not shown) through the inside of the roll bearing 40, and the other end is accommodated in the roll bearing 50. An intermediate portion of the pinch roll 10 for the continuous casting machine is rotatably supported by a roll bearing 30. Roll bearings 30, 40, and 50 that support the pinch roll 10 for the continuous casting machine are provided so that the interval between the pinch rolls 10 can be adjusted, and the slab C is pinched by the pinch roll 10 with an appropriate pinching pressure. This allows the slab C to be pulled out without excessively lowering.

As shown in FIG. 6, a roller 20 is mounted in a central portion in the axial direction of a roller bearing 30 which rotatably supports an intermediate portion of the pinch roll 10. For this purpose, a grease supply passage 40 and a grease discharge passage 50 are provided. As a conventional sealing device for a roll bearing for a continuous casting machine, as shown in FIG.
80, a packing 90, and one type of seal 60 are provided. The labyrinth 80 is mounted on the bearing housing side of the gap between the inner ring of the roll bearing 30 and the bearing housing, and has a pinch roll.
It can be inserted with a gap into a circumferential groove provided on the side end face between the large diameter portion and the small diameter portion of FIG. The packing 90 and the seal 60 are mounted on the different outer circumferential grooves of the inner ring rotatably mounted together with the pinch roll 10 from the end face side of the roll bearing 30 so as to be in contact with the inner circumferential surface of the labyrinth 80.
Are provided in this order.

A sealing device provided on a bearing portion of a rotating shaft of a rotary machine or the like is often provided for holding a lubricant such as oil or grease in the bearing and for preventing dust and water. Even if a small amount of dust or cooling water enters the bearing, the smooth rotation of the bearing is hindered, the wear increases, and the life is shortened. It is essential to provide such a sealing device.

As is well known, a seal (also referred to as an oil seal or a dust seal depending on the purpose of use) is a ring-shaped part, and a portion called a lip formed of an elastic material such as rubber is a rotary slide. The space comes into contact with the moving part, and the space is divided in the axial direction from the moving part. The contact force of the lip on the rotating slide may be due to the elasticity of the lip itself,
In general, a large-sized one has a structure in which a ring-shaped spring is fitted on the back side of the lip and the tip of the lip is pressed against the rotary sliding portion. Also, the lip has an orientation, which makes it difficult to pass material from the side of the lip to the opposite side, but vice versa.

Since the seal has the above-described structure, FIG.
In the conventional sealing device for roll bearings for continuous casting machines shown in
In order to improve the sealing performance, it is necessary to strengthen the contact between the lip portion of the seal 60 fitted in the groove of the inner ring 150 and the inner peripheral surface of the labyrinth 80. There is an essential problem that the wear is large and the life of the seal 60 is short.

In the conventional sealing device for a roll bearing for a continuous casting machine shown in FIG. 6, the life of the seal 60 is short because the seal 60 comes into contact with the inner peripheral surface of the labyrinth 80 where the temperature rises. Was. In the conventional sealing device for a roll bearing for a continuous casting machine shown in FIG. 6, when the fluctuation range of the ambient temperature is large, the pressure difference between the inside and outside of the seal 60 exceeds the sealing ability of the seal 60. There is a problem that the air and the lubricant thermally expand and a blowing phenomenon occurs, and at the next temperature decrease, the surrounding water and foreign matters are drawn in by the suction phenomenon and the air enters the roll bearing 30.

On the other hand, Japanese Patent Application Laid-Open No. 8-4776 discloses a first seal 10 for preventing the lubricant from leaking from the inside of the roll bearing 130 at both axial ends of the roll bearing 130 as shown in FIG.
6A and the second seal 106B for preventing foreign matter from entering into the roll bearing 130, the second seal 106B from the end face side of the roll bearing.
106B, the first seal 106A, and an air supply passage provided at a distance from each other and communicating with a space 100S between the two seals.
A bearing sealing device provided with 107 is disclosed. Note that 14
Numeral 0 denotes a greasing passage for supplying oil to the bearing 120.

However, in the bearing sealing device described in JP-A-8-4776, since the second seal 106B is provided on the end face of the roll bearing 130, the seal life is short when used in a high temperature environment. There was a problem.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a roll bearing for supporting an intermediate portion of a continuous casting machine roll used in a high temperature environment. An object of the present invention is to provide a sealing device for a roll bearing for a continuous casting machine, which can prevent a decrease in seal life and prevent both leakage of a lubricant from inside the roll bearing and entry of foreign matter into the roll bearing.

[0011]

SUMMARY OF THE INVENTION The present invention is directed to a roll bearing sealing device for rotatably supporting an intermediate portion of a roll for a continuous casting machine, wherein both ends of the roll bearing in the axial direction are inserted into the roll bearing. A second seal for preventing entry of foreign matter and a first seal for preventing leakage of lubricant from the inside of the roll bearing are provided in this order at an interval from an end portion, and a gas is provided in a space between the seals. A sealing device for a roll bearing for a continuous casting machine, characterized in that an air supply passage for blowing air is provided, and the second seal is provided at a position away from an end face of the roll bearing.

Preferably, the lip of the first seal is directed inward of the roll bearing, and the lip of the second seal is directed outward of the roll bearing. Device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a sealing device for a roll bearing for a continuous casting machine according to the present invention will be described in detail with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 is a front view showing a roll bearing for a continuous casting machine provided with the sealing device of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. 1 showing a sealing device for the roll bearing for a continuous casting machine. FIG. 3 is a partial sectional view showing the directions of the lips of two seals in the sealing device.

1 is a pinch roll for a continuous casting machine (roll for a continuous casting machine) supported by a roll bearing, 1A is an intermediate portion of the pinch roll for a continuous casting machine, 2 is a roller, and 3 is a roll bearing. . 3A and 3B are bearing housings, 4 is a greasing passage, 5 is a greasing passage, 6A is a first seal, 6B is a second seal, S is a space,
7 is an air supply passage. 8 is a labyrinth, 8A is a parallel pin,
9 is a packing, 15 is an inner ring, 31 is a semi-annular cooling water chamber, 31A is a water supply / drain passage, and 32 is a jacket plate.

The roll for a continuous casting machine will be described as a pinch roll 1 provided in the continuous casting machine. Roll bearing 3 that supports the intermediate portion 1A of the pinch roll 1 of the continuous casting machine
As shown in FIGS. 1 and 2, the roller 2 and one bearing box
3A, the other bearing housing 3B, and a cylindrical inner ring.
The roller bearing 3 has a roller 2 mounted between the outer peripheral surface of the inner ring 15 and the inner peripheral surfaces of the bearing boxes 3A and 3B integrated with the fastening bolts 33 so that the roller 2 rotates together with the pinch roll 1 by the rollers 2. The inner ring 15 to be mounted is rotatably supported by the bearing housings 3A and 3B, and the bearing housing 3A and the bearing housing 3B can be divided into two by loosening the fastening bolts 33.

One bearing box 3A is a flat semi-cylindrical shape obtained by dividing a flat cylinder into two parts by planes parallel to the height direction. The inner peripheral surface of the bearing box 3A is formed so as to cover half of the inner ring 15. ing. The bearing box 3A is provided with a semi-annular cooling water chamber 31 sealed with a jacket plate 32.One of the circumferential ends of the semi-annular cooling water chamber 31 is a water supply passage, and the other is a drain passage. A connection port communicating with the water supply / drain passage 31A and communicating with the water supply / drain passage 31A is provided at an axial end surface of the bearing housing 3B. And
By supplying the cooling water from the connection port, it is possible to cool the inner peripheral surface of the bearing box 3A facing the cast slab by the cooling water flowing in the semi-annular cooling water chamber 31 along the circumferential direction.

The other bearing box 3B has a rectangular parallelepiped shape having a concave portion on one end surface of which has a peripheral surface covering the other half of the inner ring 15. In the bearing housing 3B, a greasing passage 4 and a grease discharging passage 5 for supplying oil and fat to the rollers 2 are provided.
A connection port communicating with the grease drain passage 5 is provided on an axial end face of the bearing housing 3B. By supplying oil and fat from the connection port, the rollers 2 mounted in the roll bearing 3 can be lubricated.

As shown in FIG. 2, a sealing device for the roll bearing 3 that supports the intermediate portion of the pinch roll 10 includes a labyrinth 8, a packing 9, a first packing 9 at both ends in the axial direction of the roll bearing. A seal 6A and a second seal 6B are provided. The labyrinth 8 is attached to a ring-shaped groove provided on the end face of the bearing housings 3A, 3B between the bearing housings 3A, 3B and the inner ring 15 with parallel pins 8A, and has a large diameter portion and a small diameter portion of the pinch roll 10. It can be inserted with a gap in a circumferential groove provided on the side end surface between them. The packing 9 is fitted in a groove formed on the outer peripheral surface of the inner ring so as to contact the inner peripheral surface of the labyrinth 8.

The first seal 6A and the second seal 6B
As shown in FIG. 2, the bearing housing between the bearing housings 3A and 3B and the inner ring
The second seals 6B, 3B, 3A, 3B are arranged in the circumferential grooves provided on the inner surfaces of the roll bearing 3 from the end face side of the roll bearing 3 at intervals.
An air supply passage 7 is provided in the order of the first seal 6A and communicates with a space between the two seals. The first seal 6A is a seal for preventing leakage of the lubricant from the inside of the roll bearing 3, and the second seal 6B is a seal for preventing entry of foreign matter into the roll bearing 3.

Since the second seal 6B and the first seal 6A are provided in this order from the side closer to the axial end face of the roll bearing 3, the second seal 6B allows the axial end face into which foreign matter enters. The first seal 6A prevents foreign matter from entering near the
Accordingly, the lubricant is prevented from leaking in a direction closer to the inside of the roll bearing 3 from which the lubricant leaks, so that entry of foreign matter into the roll bearing 3 and leakage of the lubricant from inside the roll bearing can be prevented. .

Further, since the gas can be supplied from the air supply passage 7, the above-described prevention effect can be surely performed. here,
As shown in FIG. 2, the second seal 6 </ b> B in the sealing device of the present invention is provided at a position away from the axial end face of the roll bearing 3. A labyrinth 8 is provided in contact with the surface.

In the bearing boxes 3A and 3B in which grooves for fitting the second seal 6B are formed in the inner peripheral surface, the outer periphery of the grooves formed in the inner peripheral surface of the bearing box 3A is provided with a bearing box 3A. Is provided with a semi-annular cooling water chamber 31 for water cooling. Therefore, the temperature of the inner peripheral surface of the bearing box 3A provided with the semi-annular cooling water chamber 31 at a position distant from the end face of the roll bearing 3 increases the temperature of the roll bearing 3 whose temperature rises remarkably due to radiant heat from the high-temperature slab. Temperature at the end face,
Alternatively, since the temperature can be lower than the temperature in the labyrinth 8 attached to the end face of the roll bearing 3, the temperature rise of the second seal 6B can be suppressed, and the life of the second seal 6B can be extended.

Of course, the first seal 6A is provided at a position farther from the end face of the roll bearing 3 than the second seal 6B, so that the rotation speed of the pinch roll 1 is low and the amount of heat generated by the rollers 2 is small. The life of the first seal 6A does not matter. Note that the grooved roller 2 in which the second seal 6B is fitted is
It is preferable that the axial distance from the center be within the distance from the center of the roller 2 to the axial end of the semi-annular cooling water chamber 31 because the influence of the temperature of the slab can be further reduced and the service life can be extended.

Further, in the sealing device of the present invention, as shown in FIG. 3, an air supply passage 7 for blowing gas into the space S between the two seals is provided, and the lip of the first seal 6A is rolled. Preferably, the lip of the second seal 6 </ b> B is on the inner side, and the lip of the second seal 6 </ b> B is on the outer side opposite to the side on which the rollers 2 are provided. The reason for this is that, as shown in FIG. 3, when the direction of the lip of the first seal 6A is inward, the lip portion is pressed from the back surface, the contact pressure of the lip is reduced, and the lip is pushed out and expanded as indicated by the arrow. As shown, gas spouts inward,
It has the function of preventing leakage of lubricant from inside. In addition,
The gas will erupt inward with rollers 2 attached,
There is no problem because dust and dehumidified low-pressure gas are used. When the direction of the lip of the second seal 6B is outward, the lip is pushed out in the same manner as described above, and gas is ejected outward as shown by an arrow. is there. As described above, it has an effect of preventing leakage of the lubricant from the inside of the roll bearing and an effect of preventing entry of foreign matter into the roll bearing, and excellent sealing performance can be obtained.

In the sealing device for a roll bearing for a continuous casting machine according to the present invention, air is blown into the space S shown in FIG. If the pressure of the gas blown into the space S is too small, the above effects cannot be obtained. If the pressure is too large, the gas consumption increases. Therefore, it is desirable that the pressure be as low as possible within the range of the positive pressure. 0.03 MPa
The following ranges are good.

The flow rate of the gas blown into the space S is sufficiently small, not more than 20 Nl / min per one place, in order to prevent water and other foreign substances from entering from outside the system. One place is
One space S between the first seal 6A and the second seal 6B. The gas used in the sealing device of the roll bearing for a continuous casting machine according to the present invention may be a clean gas that does not cause corrosion or the like in the vicinity of the seal, and may be a gas such as nitrogen other than air.

The material of the first seal 6A and the second seal 6B used in the sealing device for a roll bearing for a continuous casting machine according to the present invention can be made of fluoro rubber. The sealing device of the present invention described above is an example in which the sealing device is provided on a roll bearing of a pinch roll for a continuous casting machine, but the present invention is not limited to a roll bearing of a pinch roll, and is used for a continuous casting machine. The present invention can be applied to a roll bearing that supports an intermediate portion of a roll.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The sealing device described with reference to FIGS. Roll bearing 3 so that the outer peripheral surface of
Was attached to an intermediate portion of the pinch roll 1 and arranged in a continuous casting machine, and as shown in FIG.

FIG. 4 shows only a pair of pinch rolls 1 of the continuous casting machine, and a greasing / draining pipe and cooling water connected to a roll bearing 3 that supports the intermediate portion of the pinch rolls 1. The illustration of water supply / drainage pipes for supplying water is omitted. In FIG. 4, reference numeral 71 denotes an air pipe, 72 denotes an orifice, 73 denotes an air main pipe, 74 denotes a dust remover, 75 denotes a dehumidifier, 76 denotes a pressure reducing valve, and C denotes a cast piece. A dehumidifier 75 and a pressure reducing valve 76 are provided, and an orifice 72 is provided between the pressure reducing valve 76 and the gas pipe 71 and at a position close to the roll bearing 3. Then, the outlet pressure of the pressure reducing valve 76 is set to 0.05 to 0.4.
MPa, and the hole diameter of the orifice 72 to be inserted near the bearing is individually selected within the range of 0.3 to 2.5 mm. The gas pressure in the space S is 0.03 MPa or less in gauge pressure, and the flow rate is 20 Nl / min or less.

Under a high temperature environment, as a result of continuously casting the slab with a pinch roll for a continuous casting machine, as a result, axially opposite ends of a roll bearing that rotatably supports an intermediate portion of the roll for a continuous casting machine. A first seal for preventing lubricant from leaking from inside the roll bearing and a second seal for preventing entry of foreign matter into the bearing;
The first seal is provided at a distance from each other in the order of
An air supply passage that blows gas into the space between the two seals is provided,
Since the second seal is provided at a position distant from the end face of the roll bearing, the seal life can be prevented from being shortened even in a high temperature environment, and the leakage of the lubricant from the inside of the bearing and the entry of foreign matter into the bearing can be prevented. Both could be prevented.

[0031]

According to the present invention, in a high temperature environment,
A reduction in the life of the seal can be prevented, the leakage of the lubricant from the inside of the roll bearing and the intrusion of water or foreign matter into the roll bearing can be prevented, and the sealing performance can be improved. This not only improves the operating rate of the continuous casting machine, but also reduces the frequency of seal replacement, reducing maintenance work, eliminating contamination and lubricant consumption due to lubricant leakage, and significantly extending bearing life. There are many excellent effects, such as being able to do.

[Brief description of the drawings]

FIG. 1 is a front view showing a roll bearing for a continuous casting machine provided with a sealing device of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1 showing a sealing device for a roll bearing for a continuous casting machine.

FIG. 3 is a partial sectional view showing a direction of a lip of a seal in the sealing device.

FIG. 4 is an arrangement view of a roll bearing for a continuous casting machine provided with a sealing device in the embodiment.

FIG. 5 is a layout view of a roll bearing of a conventional roll for a continuous casting machine.

FIG. 6 is a sectional view showing a conventional sealing device for a roll bearing for a continuous casting machine.

FIG. 7 is a sectional view showing another conventional bearing sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pinch roll (roll for continuous casting machines) 1A Intermediate part 2 Roller 3 Roll bearing (roll bearing for continuous casting machines) 3A, 3B Bearing box 4 Greasing passage 5 Drainage passage 6A First seal 6B Second seal S Space 7 Air supply passage 8 Labyrinth 8A Parallel pin 9 Packing 15 Inner ring 31 Annular cooling water chamber 32 Jacket plate 71 Gas pipe 72 Orifice 73 Gas main pipe 74 Dust remover 75 Dehumidifier 76 Pressure reducing valve C Cast slab

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16J 15/32 311 F16J 15/32 311N (72) Inventor Takashi Kuroki 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Tomonori Kamiyama 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works 1 (72) Inventor Tomoyuki Kishinami 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture F-term (reference) at Kawasaki Steel Corporation Chiba Works 3J006 AE14 AE50 3J016 AA02 BB03 BB24 BB26 CA06 CA08 4E004 LC05 MD01 MD04

Claims (2)

[Claims] 1. A sealing device for a roll bearing for rotatably supporting an intermediate portion of a roll for a continuous casting machine, wherein a sealing member for preventing foreign matter from entering into the roll bearing at both axial ends of the roll bearing. A seal for preventing leakage of lubricant from inside the roll bearing and a first seal for preventing leakage of lubricant from the inside of the roll bearing in this order, and providing an air supply passage for blowing gas into a space between the seals; The sealing device for a roll bearing for a continuous casting machine, wherein the second seal is provided at a position distant from an end face of the roll bearing. 2. The lip of the first seal is directed toward the inside of the roll bearing, and the lip of the second seal is directed toward the outside of the roll bearing.
3. A sealing device for a roll bearing for a continuous casting machine according to claim 1.