JP2004148407A - Device for sealing bearing for roll in continuous caster, sealing method and continuous caster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device and a technique using this device with which the shortening of the service life of the sealing can be prevented and both of the leakage of lubricator from the inner part of a bearing for roll and the invasion of foreign matter into the bearing for roll can be prevented, in the bearing for roll supporting the intermediate part of the roll for continuous caster used in high temperature atmosphere. <P>SOLUTION: At both end parts in the axial direction of the bearing for roll, a groove forming two seals on the inner peripheral surface at both end parts in the axial direction of a bearing box of the bearing for roll is arranged. Then, in the bearing box at the side facing to a cast slab, a semi-annular cooling water chamber formed by covering the cut groove by notching a part of the outer periphery at the side facing to the cast slab in the periphery direction with almost semi-annular jacket plate is arranged and the outer periphery of the jacket plate is nearer to the center axis of the roll than the outer periphery of the above roll. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a sealing device, a sealing method, and a continuous casting machine for a roll bearing that rotatably supports an intermediate portion of a roll for a continuous casting machine.

  Various continuous casting machine rolls are provided in a continuous casting machine 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 a 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 clamping pressure. This enables the slab C to be pulled out without excessively rolling down.

  As shown in FIG. 6, a roller 20 is mounted at a central portion in the axial direction in a roll bearing 30 that rotatably supports an intermediate portion of the pinch roll 10. A greasing passage 40 and a grease discharging passage 50 are provided.

  As a conventional sealing device for a roll bearing for a continuous casting machine, as shown in FIG. 6, a labyrinth 80, a packing 90, and one type of seal 60 are provided at both axial ends of a roll bearing 30. The labyrinth 80 is attached to the bearing housing side of the clearance between the inner ring of the roll bearing 30 and the bearing housing, and has a clearance in a circumferential groove provided on a side end surface between the large diameter portion and the small diameter portion of the pinch roll 10. It can be inserted. The packing 90 and the seal 60 are provided in the order of the packing 90 and the seal 60 from the end face side of the roll bearing 30 in different outer circumferential grooves of the inner ring rotatably mounted together with the pinch roll 10 so as to contact the inner circumferential surface of the labyrinth 80. Have been.

A bearing sealing device as shown in FIG. 7 is also known (Patent Document 1).
JP-A-8-4776

  By the way, a sealing device provided in a bearing portion of a rotating shaft of a rotating 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 a sealing device such as.

  As is well known, a seal (sometimes called 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 body such as rubber is provided on a rotary sliding portion. The space is divided in the axial direction by this contact. The contact force of the lip to the rotating sliding part may be due to the elasticity of the lip itself, but in the case of a large lip, a ring-shaped spring is fitted on the back side of the lip and the tip of the lip is pressed against the rotating sliding part. It is a target. 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 structure as described above, in the conventional sealing device for a roll bearing for a continuous casting machine shown in FIG. 6, in order to improve the sealing performance, the lip of the seal 60 fitted in the groove of the inner ring 150, It is necessary to strengthen the contact with the inner peripheral surface of the labyrinth 80, and there is an essential problem that the frictional resistance to the rotating shaft is increased and the lip portion is greatly worn, so that the life of the seal 60 is short.

  Further, 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 contacts the inner peripheral surface of the labyrinth 80 where the temperature becomes high. 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 to generate a blowing phenomenon, and at the time of the next temperature decrease, surrounding water and foreign matter are drawn in by the suction phenomenon and air enters the roll bearing 30.

  On the other hand, in the bearing sealing device shown in FIG. 7, the first seal 106A for preventing the lubricant from leaking from the inside of the roll bearing 130 and the foreign matter to the inside of the roll bearing 130 are provided at both ends in the axial direction of the roll bearing 130. A second seal 106B for preventing intrusion is provided in the order of the second seal 106B and the first seal 106A from the end face side of the roll bearing with an interval therebetween, and an air supply passage 107 communicating with a space 100S between the two seals. It is a device provided with. Reference numeral 140 denotes a grease supply passage for supplying oil to the bearing 120.

  However, the bearing sealing device described in Japanese Patent Application Laid-Open No. 8-4776 has a problem in that the second seal 106B is provided on the end face of the roll bearing 130, and when used in a high-temperature environment, the seal life is short. Was.

  Then, an object of the present invention is to solve the above-mentioned problems of the prior art, and in a roll bearing that supports an intermediate portion of a continuous casting machine roll used in a high-temperature environment, a reduction in seal life can be prevented, and An object of the present invention is to provide a sealing device, a sealing method, and a continuous casting machine of a roll bearing for a continuous casting machine capable of preventing both leakage of a lubricant from inside the roll bearing and entry of foreign matter into the roll bearing.

The present invention is as follows.
1. In a sealing device for a roll bearing that rotatably supports an intermediate portion of a roll for a continuous casting machine, a second device for preventing intrusion of foreign matter into the roll bearing at both axial ends of a bearing box of the roll bearing. A seal and a first seal for preventing leakage of lubricant from the inside of the roll bearing are spaced from each other in this order from both ends in the axial direction of the roll bearing, and the inner periphery of both ends in the axial direction of the bearing box of the roll bearing. In addition to the grooves formed in the surface, the bearing box on the slab side facing the slab has a groove formed by cutting out a part of the outer periphery on the side facing the slab in the circumferential direction and engraving on the outer periphery. A semi-annular cooling water chamber formed by covering with a jacket plate is provided, and the outer periphery of the jacket plate is closer to the center axis of the roll than the outer periphery of the roll. Sealing device.
2. The above 1. According to a roll bearing using a sealing device for a continuous casting machine roll bearing according to the above, when rotatably supporting the intermediate portion of the continuous casting machine roll, supplying cooling water to the semi-annular cooling water chamber, A method for sealing a roll bearing for a continuous casting machine, comprising draining used cooling water from a semi-annular cooling water chamber.
3. 1. A continuous casting machine in which a pair of pinch rolls are installed at a plurality of positions in a drawing direction of a slab with the slab interposed therebetween, wherein the roll bearing rotatably supports an intermediate portion of the pinch roll. A water supply pipe for supplying cooling water to the semi-annular cooling water chamber and a drain pipe for discharging used cooling water from the semi-annular cooling water chamber are connected. Continuous casting machine characterized by being made.

  ADVANTAGE OF THE INVENTION According to this invention, in a high temperature environment, it is possible to prevent a reduction in the life of the seal, to prevent the leakage of lubricant from the inside of the roll bearing and the intrusion of water or foreign matter into the roll bearing, and to improve the sealability. Can be done. 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 consumption of lubricant due to lubricant leakage, and significantly extending bearing life. There are many excellent effects, such as being able to do.

  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.

  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.

  Reference numeral 1 denotes a pinch roll (roll for a continuous casting machine) supported by a roll bearing, 1A denotes an intermediate portion of the pinch roll 1, 2 denotes a roller, and 3 denotes a roll bearing. Reference numerals 3A and 3B denote bearing housings, 4 denotes a greasing passage, 5 denotes a grease discharging passage, 6A denotes a first seal, 6B denotes a second seal, and S denotes a space formed between the two seals. Is shown. Reference numeral 7 denotes an air supply passage for blowing gas into a space S formed between the two seals.

  Reference numeral 8 denotes a labyrinth, 8A denotes a parallel pin, 9 denotes a packing, 15 denotes an inner ring, reference numeral 31 denotes a semi-annular cooling water chamber, 31A denotes a water supply / drain passage, and 32 denotes a jacket plate.

  As shown in FIGS. 1 and 2, a roll bearing 3, which supports the intermediate portion 1A of the pinch roll 1 of the continuous casting machine, includes a roller 2, one bearing box 3A, the other bearing box 3B, and a cylindrical member. The inner ring 15 is provided. 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 housings 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 boxes 3A and 3B, and is loosened into the bearing box 3A and the bearing box 3B by loosening the fastening bolts 33.

  One bearing box 3A is a flat semi-cylindrical body obtained by dividing a flat cylinder into two by a plane parallel to the height direction, and the inner peripheral surface of the bearing box 3A is formed so as to cover half of the inner ring 15. I have. The bearing box 3A is provided with a semi-annular cooling water chamber 31 sealed with a jacket plate 32, and one end of the semi-annular cooling water chamber 31 in the circumferential direction has a water supply passage and the other has 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. By supplying the cooling water from the connection port, the inner peripheral surface of the bearing box 3A facing the cast piece can be cooled 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 formed on one end surface with a peripheral surface covering the other half of the inner ring 15. A lubrication passage 4 and a grease passage 5 for supplying oil and fat to the rollers 2 are provided in the bearing box 3B, and a connection port communicating with the grease passage 4 and the grease passage 5 is provided on a shaft of the bearing box 3B. Direction end face. 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 1 includes a labyrinth 8, a packing 9, and a first seal 6A at both axial ends of the roll bearing 3. And a second seal 6B. The labyrinth 8 is mounted with parallel pins 8A in ring-shaped grooves provided on the end faces of the bearing housings 3A and 3B between the bearing housings 3A and 3B and the inner ring 15, and has a large diameter portion and a small diameter portion of the pinch roll 1. It can be inserted with a gap in a circumferential groove provided on the side end face 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.

  As shown in FIG. 2, the first seal 6A and the second seal 6B are provided in grooves along the circumferential direction provided on the inner surfaces of the bearing boxes 3A and 3B between the bearing boxes 3A and 3B and the inner ring. A second seal 6B and a first seal 6A are provided in this order from the end face side of the roll bearing 3 at an interval from each other, and an air supply passage 7 communicating with a space between the two seals is provided. 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 second seal 6B to be closer to the axial end face where foreign matter enters. The first seal 6A prevents the lubricant from leaking closer to the inside of the roll bearing 3 from which the lubricant leaks, so that the first seal 6A prevents the lubricant from leaking into the roll bearing 3. Leakage of lubricant from inside the roll bearing can be prevented. In addition, since the gas can be supplied from the air supply passage 7, the above-described prevention effect can be reliably obtained.

  Here, as shown in FIG. 2, the second seal 6B in the sealing device of the present invention is a groove formed on an inner peripheral surface of the roller housing 3 at a position away from both axial end surfaces of the bearing boxes 3A and 3B. At both ends in the axial direction of the roll bearing 3, a labyrinth 8 in which a packing 9 is in contact with an inner peripheral surface is provided. Then, among 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 water-cooled in the bearing box 3A. A cooling water chamber (hereinafter, referred to as a semi-circular cooling water chamber) 31 having a substantially semicircular outer periphery is provided.

  Therefore, the temperature of the inner peripheral surface of the bearing box 3A on the side opposite to the slab provided with the semi-annular cooling water chamber 31 at a position distant from both axial end surfaces of the roll bearing 3 is determined by the temperature from the high-temperature slab. Since the temperature at the end face of the roll bearing 3 whose temperature rise is remarkable due to radiant heat or the temperature at the labyrinth 8 attached to both axial ends of the roll bearing 3 can be made lower, the temperature rise of the second seal 6B can be suppressed, and the second The life of the seal 6B can be extended.

  Of course, the first seal 6A is provided in a groove formed on the inner peripheral surface at a position further away from the axial end surfaces of the bearing housings 3A and 3B of the roll bearing 3 than the second seal 6B. Since the rotation speed of the roll 1 is low and the calorific value of the roller 2 is small, the life of the first seal 6A does not matter. The axial distance from the center of the roller 2 into which the second seal 6B is fitted is within the distance from the center of the roller 2 to the axial end of the semi-annular cooling water chamber 31. This is preferable because the influence can be further reduced and the 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 in the bearing box 3B on the opposite side of the cast piece. It is preferable that the direction of the lip of 6A is the inside where the rollers 2 are provided, and the direction of the lip of the second seal 6B is the outside opposite to the direction where the rollers 2 are provided.

  The reason for this is that, as shown in FIG. 3, when the lip of the first seal 6A is oriented 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, the gas blows inward to prevent the lubricant from leaking from the inside. In addition, although the gas will be ejected inward with the rollers 2 attached thereto, there is no problem since 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 the gas is ejected outward as shown by the arrow, so that the action of preventing foreign matter from entering the inside is effective. is there. As described above, it has the function of preventing the leakage of the lubricant from the inside of the roll bearing and the function of preventing the entry of foreign matter into the roll bearing, and provides excellent sealing performance.

 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 effect 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 a positive pressure range. A range of 0.03 MPa or less is preferable.

  The flow rate of the gas to be blown into the space S is sufficiently small as 20 Nl / min or less per one place in order to prevent water and other foreign substances from entering from outside the system. One location 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 of the present invention may be any gas other than air, such as nitrogen, as long as it is clean so as not to cause corrosion or the like near the seal. Further, 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 of the present invention can be made of fluoro rubber.

  Although the sealing device of the present invention described above is an example in which the sealing device is provided on a pinch roll roll bearing for a continuous casting machine, the present invention is not limited to a pinch roll roll bearing, and is used for a continuous casting machine. It can be applied to a roll bearing that supports the middle part of the roll.

  The sealing device described with reference to FIGS. 1 to 3 is provided on a roll bearing 3 that supports an intermediate portion of a pinch roll 1 for a continuous casting machine, and an outer periphery of a jacket plate 32 that seals a semi-annular cooling water chamber 31 of the roll bearing 3. The roll bearing 3 was attached to the intermediate part of the pinch roll 1 so that the surface thereof faced the slab C, and was arranged in a continuous casting machine. The slab C was pulled out by the pinch roll 1 as shown in FIG.

  Note that FIG. 4 shows only a pair of pinch rolls 1 of the continuous casting machine, and supplies lubrication / drainage piping and cooling water connected to a roll bearing 3 that supports an intermediate portion of the pinch rolls 1. The illustration of water supply / drainage piping 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 slab. Here, a dust removing device 74, a dehumidifying device 75, and a pressure reducing valve 76 are provided in the air main pipe 73, and an orifice 72 is provided between the pressure reducing valve 76 and the air pipe 71 at a position close to the roll bearing 3. Then, the outlet pressure of the pressure reducing valve 76 is set to about 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 flow rate was set to 0.03 MPa or less and the flow rate to 20 Nl / min or less per location.

  As a result of continuous casting while pinching the slab with pinch rolls, it is possible to prevent a decrease in seal life even in a high-temperature environment, and to prevent both leakage of lubricant from inside the bearing and entry of foreign matter into the bearing It was possible.

FIG. 1 is a front view showing a roll bearing for a continuous casting machine provided with the 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 the direction of the lip of the seal in the sealing device. FIG. 4 is an arrangement diagram of a roll bearing for a continuous casting machine provided with a sealing device in the embodiment. FIG. 5 is an arrangement 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 reference numerals

1 Pinch roll (roll for continuous casting machine)
1A Middle part 2 Roller 3 Roll bearing (roll bearing for continuous casting machine)
3A, 3B Bearing housing 4 Greasing passage 5 Drain passage
6A First seal
6B 2nd seal S space 7 Air supply passage 8 Labyrinth
8A Parallel pin 9 Packing
15 Inner ring
31 Semi-annular cooling water chamber
31A Water supply / drainage passage
32 jacket plate
33 Fastening bolt
71 Air piping
72 orifice
73 Air mains
74 Dust remover
75 Dehumidifier
76 Pressure reducing valve C slab

Claims (3)

  In a sealing device for a roll bearing rotatably supporting an intermediate portion of a roll for a continuous casting machine, a second device for preventing intrusion of foreign matter into the roll bearing at both axial ends of a bearing box of the roll bearing. A seal and a first seal for preventing leakage of lubricant from the inside of the roll bearing are spaced from each other in this order from both ends in the axial direction of the roll bearing, and the inner periphery of both ends in the axial direction of the bearing box of the roll bearing. In addition to the grooves formed on the surface, the bearing box on the side facing the slab has a groove formed by cutting out a part of the outer circumference on the side facing the slab in the circumferential direction and having a substantially semi-annular outer circumference. Sealing of a roll bearing for a continuous casting machine, wherein a semi-annular cooling water chamber formed by covering with a jacket plate is provided, and the outer periphery of the jacket plate is closer to the center axis of the roll than the outer periphery of the roll. apparatus.   The cooling water is supplied to the semi-annular cooling water chamber when the intermediate portion of the roll for the continuous casting machine is rotatably supported by the roll bearing using the sealing device for the roll bearing for the continuous casting machine according to claim 1. And a method of sealing a roll bearing for a continuous casting machine, wherein the used cooling water is drained from the semi-annular cooling water chamber.   A continuous casting machine comprising a pair of pinch rolls installed at a plurality of positions in a drawing direction of the slab with the slab interposed therebetween, wherein the roll bearing rotatably supports an intermediate portion of the pinch roll. A sealing device for a casting machine roll bearing is used, and a water supply pipe for supplying cooling water to the semi-annular cooling water chamber and a drain pipe for discharging used cooling water from the semi-annular cooling water chamber are connected. A continuous casting machine.

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